diff --git a/deps/v8/ChangeLog b/deps/v8/ChangeLog
index 91b583fd0d..2debaa09fc 100644
--- a/deps/v8/ChangeLog
+++ b/deps/v8/ChangeLog
@@ -1,3 +1,26 @@
+2010-12-13: Version 3.0.1
+
+        Added support for an experimental internationalization API as an
+        extension.  This extension is disabled by default but can be enabled
+        when building V8.  The ECMAScript internationalization strawman is
+        at http://wiki.ecmascript.org/doku.php?id=strawman:i18n_api.
+
+        Made RegExp character class parsing stricter.  This mirrors a change
+        to RegExp parsing in WebKit.
+
+        Fixed a bug in Object.defineProperty when used to change attributes
+        of an existing property.  It incorrectly set the property value to
+        undefined (issue 965).
+
+        Fixed several different compilation failures on various platforms
+        caused by the 3.0.0 release.
+
+        Optimized Math.pow so it can work on unboxed doubles.
+
+        Sped up quoting of JSON strings by removing one traversal of the
+        string.
+
+
 2010-12-07: Version 3.0.0
 
         Improved performance by (partially) addressing issue 957 on
@@ -132,7 +155,7 @@
 
         Added USE_SIMULATOR macro that explicitly indicates that we wish to use
         the simulator as the execution engine (by Mark Lam <mark.lam@palm.com>
-	from Hewlett-Packard Development Company, LP).
+        from Hewlett-Packard Development Company, LP).
 
         Fixed compilation error on ARM with gcc 4.4 (issue 894).
 
diff --git a/deps/v8/include/v8-preparser.h b/deps/v8/include/v8-preparser.h
index 68ce50223e..9425f7d467 100644
--- a/deps/v8/include/v8-preparser.h
+++ b/deps/v8/include/v8-preparser.h
@@ -99,13 +99,6 @@ class UnicodeInputStream {
   // Returns the next Unicode code-point in the input, or a negative value when
   // there is no more input in the stream.
   virtual int32_t Next() = 0;
-
-  // Pushes a read character back into the stream, so that it will be the next
-  // to be read by Advance(). The character pushed back must be the most
-  // recently read character that hasn't already been pushed back (i.e., if
-  // pushing back more than one character, they must occur in the opposite order
-  // of the one they were read in).
-  virtual void PushBack(int32_t ch) = 0;
 };
 
 
diff --git a/deps/v8/include/v8-profiler.h b/deps/v8/include/v8-profiler.h
index 08f47ca36e..675a229854 100644
--- a/deps/v8/include/v8-profiler.h
+++ b/deps/v8/include/v8-profiler.h
@@ -245,7 +245,6 @@ class V8EXPORT HeapGraphPath {
 class V8EXPORT HeapGraphNode {
  public:
   enum Type {
-    kInternal = 0,   // For compatibility, will be removed.
     kHidden = 0,     // Hidden node, may be filtered when shown to user.
     kArray = 1,      // An array of elements.
     kString = 2,     // A string.
@@ -413,7 +412,8 @@ class V8EXPORT HeapProfiler {
    */
   static const HeapSnapshot* TakeSnapshot(
       Handle<String> title,
-      HeapSnapshot::Type type = HeapSnapshot::kFull);
+      HeapSnapshot::Type type = HeapSnapshot::kFull,
+      ActivityControl* control = NULL);
 };
 
 
diff --git a/deps/v8/include/v8.h b/deps/v8/include/v8.h
index 8ecf63aebd..7fd063197e 100644
--- a/deps/v8/include/v8.h
+++ b/deps/v8/include/v8.h
@@ -3281,6 +3281,24 @@ class V8EXPORT OutputStream {  // NOLINT
 };
 
 
+/**
+ * An interface for reporting progress and controlling long-running
+ * activities.
+ */
+class V8EXPORT ActivityControl {  // NOLINT
+ public:
+  enum ControlOption {
+    kContinue = 0,
+    kAbort = 1
+  };
+  virtual ~ActivityControl() {}
+  /**
+   * Notify about current progress. The activity can be stopped by
+   * returning kAbort as the callback result.
+   */
+  virtual ControlOption ReportProgressValue(int done, int total) = 0;
+};
+
 
 // --- I m p l e m e n t a t i o n ---
 
diff --git a/deps/v8/preparser/preparser-process.cc b/deps/v8/preparser/preparser-process.cc
index 80e83508e4..26dfc42b53 100644
--- a/deps/v8/preparser/preparser-process.cc
+++ b/deps/v8/preparser/preparser-process.cc
@@ -127,7 +127,7 @@ uint32_t ReadUInt32(FILE* source, bool* ok) {
 
 
 bool ReadBuffer(FILE* source, void* buffer, size_t length) {
-  size_t actually_read = fread(buffer, 1, length, stdin);
+  size_t actually_read = fread(buffer, 1, length, source);
   return (actually_read == length);
 }
 
@@ -150,22 +150,25 @@ class ScopedPointer {
 };
 
 
-// Preparse stdin and output result on stdout.
-int PreParseIO() {
+// Preparse input and output result on stdout.
+int PreParseIO(FILE* input) {
   fprintf(stderr, "LOG: Enter parsing loop\n");
   bool ok = true;
-  uint32_t length = ReadUInt32(stdin, &ok);
+  uint32_t length = ReadUInt32(input, &ok);
+  fprintf(stderr, "LOG: Input length: %d\n", length);
   if (!ok) return kErrorReading;
   ScopedPointer<uint8_t> buffer(new uint8_t[length]);
 
-  if (!ReadBuffer(stdin, *buffer, length)) {
+  if (!ReadBuffer(input, *buffer, length)) {
     return kErrorReading;
   }
   UTF8InputStream input_buffer(*buffer, static_cast<size_t>(length));
 
   v8::PreParserData data =
-      v8::Preparse(&input_buffer, 64 * sizeof(void*));  // NOLINT
+      v8::Preparse(&input_buffer, 64 * 1024 * sizeof(void*));  // NOLINT
   if (data.stack_overflow()) {
+    fprintf(stderr, "LOG: Stack overflow\n");
+    fflush(stderr);
     // Report stack overflow error/no-preparser-data.
     WriteUInt32(stdout, 0, &ok);
     if (!ok) return kErrorWriting;
@@ -173,6 +176,8 @@ int PreParseIO() {
   }
 
   uint32_t size = data.size();
+  fprintf(stderr, "LOG: Success, data size: %u\n", size);
+  fflush(stderr);
   WriteUInt32(stdout, size, &ok);
   if (!ok) return kErrorWriting;
   if (!WriteBuffer(stdout, data.data(), size)) {
@@ -185,10 +190,17 @@ int PreParseIO() {
 
 
 int main(int argc, char* argv[]) {
+  FILE* input = stdin;
+  if (argc > 1) {
+    char* arg = argv[1];
+    input = fopen(arg, "rb");
+    if (input == NULL) return EXIT_FAILURE;
+  }
   int status = 0;
   do {
-    status = v8::internal::PreParseIO();
+    status = v8::internal::PreParseIO(input);
   } while (status == 0);
   fprintf(stderr, "EXIT: Failure %d\n", status);
+  fflush(stderr);
   return EXIT_FAILURE;
 }
diff --git a/deps/v8/samples/shell.cc b/deps/v8/samples/shell.cc
index 460457552c..6b67df6c6c 100644
--- a/deps/v8/samples/shell.cc
+++ b/deps/v8/samples/shell.cc
@@ -45,7 +45,6 @@ v8::Handle<v8::Value> Quit(const v8::Arguments& args);
 v8::Handle<v8::Value> Version(const v8::Arguments& args);
 v8::Handle<v8::String> ReadFile(const char* name);
 void ReportException(v8::TryCatch* handler);
-void SetFlagsFromString(const char* flags);
 
 
 int RunMain(int argc, char* argv[]) {
@@ -345,8 +344,3 @@ void ReportException(v8::TryCatch* try_catch) {
     }
   }
 }
-
-
-void SetFlagsFromString(const char* flags) {
-  v8::V8::SetFlagsFromString(flags, strlen(flags));
-}
diff --git a/deps/v8/src/api.cc b/deps/v8/src/api.cc
index 0ec8cf123e..e169bd08a0 100644
--- a/deps/v8/src/api.cc
+++ b/deps/v8/src/api.cc
@@ -1165,14 +1165,22 @@ void ObjectTemplate::SetInternalFieldCount(int value) {
 
 
 ScriptData* ScriptData::PreCompile(const char* input, int length) {
-  unibrow::Utf8InputBuffer<> buf(input, length);
-  return i::ParserApi::PreParse(i::Handle<i::String>(), &buf, NULL);
+  i::Utf8ToUC16CharacterStream stream(
+      reinterpret_cast<const unsigned char*>(input), length);
+  return i::ParserApi::PreParse(&stream, NULL);
 }
 
 
 ScriptData* ScriptData::PreCompile(v8::Handle<String> source) {
   i::Handle<i::String> str = Utils::OpenHandle(*source);
-  return i::ParserApi::PreParse(str, NULL, NULL);
+  if (str->IsExternalTwoByteString()) {
+    i::ExternalTwoByteStringUC16CharacterStream stream(
+      i::Handle<i::ExternalTwoByteString>::cast(str), 0, str->length());
+    return i::ParserApi::PreParse(&stream, NULL);
+  } else {
+    i::GenericStringUC16CharacterStream stream(str, 0, str->length());
+    return i::ParserApi::PreParse(&stream, NULL);
+  }
 }
 
 
@@ -4939,7 +4947,8 @@ const HeapSnapshot* HeapProfiler::FindSnapshot(unsigned uid) {
 
 
 const HeapSnapshot* HeapProfiler::TakeSnapshot(Handle<String> title,
-                                               HeapSnapshot::Type type) {
+                                               HeapSnapshot::Type type,
+                                               ActivityControl* control) {
   IsDeadCheck("v8::HeapProfiler::TakeSnapshot");
   i::HeapSnapshot::Type internal_type = i::HeapSnapshot::kFull;
   switch (type) {
@@ -4953,7 +4962,8 @@ const HeapSnapshot* HeapProfiler::TakeSnapshot(Handle<String> title,
       UNREACHABLE();
   }
   return reinterpret_cast<const HeapSnapshot*>(
-      i::HeapProfiler::TakeSnapshot(*Utils::OpenHandle(*title), internal_type));
+      i::HeapProfiler::TakeSnapshot(
+          *Utils::OpenHandle(*title), internal_type, control));
 }
 
 #endif  // ENABLE_LOGGING_AND_PROFILING
diff --git a/deps/v8/src/arm/full-codegen-arm.cc b/deps/v8/src/arm/full-codegen-arm.cc
index 7e4a28042f..921629d6f2 100644
--- a/deps/v8/src/arm/full-codegen-arm.cc
+++ b/deps/v8/src/arm/full-codegen-arm.cc
@@ -890,7 +890,9 @@ void FullCodeGenerator::VisitForInStatement(ForInStatement* stmt) {
   __ bind(&update_each);
   __ mov(result_register(), r3);
   // Perform the assignment as if via '='.
-  EmitAssignment(stmt->each());
+  { EffectContext context(this);
+    EmitAssignment(stmt->each(), stmt->AssignmentId());
+  }
 
   // Generate code for the body of the loop.
   Visit(stmt->body());
@@ -1444,7 +1446,7 @@ void FullCodeGenerator::VisitAssignment(Assignment* expr) {
     // For property compound assignments we need another deoptimization
     // point after the property load.
     if (property != NULL) {
-      PrepareForBailoutForId(expr->compound_bailout_id(), TOS_REG);
+      PrepareForBailoutForId(expr->CompoundLoadId(), TOS_REG);
     }
 
     Token::Value op = expr->binary_op();
@@ -1536,7 +1538,7 @@ void FullCodeGenerator::EmitBinaryOp(Token::Value op,
 }
 
 
-void FullCodeGenerator::EmitAssignment(Expression* expr) {
+void FullCodeGenerator::EmitAssignment(Expression* expr, int bailout_ast_id) {
   // Invalid left-hand sides are rewritten to have a 'throw
   // ReferenceError' on the left-hand side.
   if (!expr->IsValidLeftHandSide()) {
@@ -1584,6 +1586,8 @@ void FullCodeGenerator::EmitAssignment(Expression* expr) {
       break;
     }
   }
+  PrepareForBailoutForId(bailout_ast_id, TOS_REG);
+  context()->Plug(r0);
 }
 
 
@@ -1657,8 +1661,6 @@ void FullCodeGenerator::EmitVariableAssignment(Variable* var,
     }
     __ bind(&done);
   }
-
-  context()->Plug(result_register());
 }
 
 
@@ -1701,10 +1703,10 @@ void FullCodeGenerator::EmitNamedPropertyAssignment(Assignment* expr) {
     __ push(ip);
     __ CallRuntime(Runtime::kToFastProperties, 1);
     __ pop(r0);
-    context()->DropAndPlug(1, r0);
-  } else {
-    context()->Plug(r0);
+    __ Drop(1);
   }
+  PrepareForBailoutForId(expr->AssignmentId(), TOS_REG);
+  context()->Plug(r0);
 }
 
 
@@ -1745,10 +1747,10 @@ void FullCodeGenerator::EmitKeyedPropertyAssignment(Assignment* expr) {
     __ push(ip);
     __ CallRuntime(Runtime::kToFastProperties, 1);
     __ pop(r0);
-    context()->DropAndPlug(1, r0);
-  } else {
-    context()->Plug(r0);
+    __ Drop(1);
   }
+  PrepareForBailoutForId(expr->AssignmentId(), TOS_REG);
+  context()->Plug(r0);
 }
 
 
@@ -3200,6 +3202,8 @@ void FullCodeGenerator::VisitCountOperation(CountOperation* expr) {
         { EffectContext context(this);
           EmitVariableAssignment(expr->expression()->AsVariableProxy()->var(),
                                  Token::ASSIGN);
+          PrepareForBailoutForId(expr->AssignmentId(), TOS_REG);
+          context.Plug(r0);
         }
         // For all contexts except EffectConstant We have the result on
         // top of the stack.
@@ -3209,6 +3213,8 @@ void FullCodeGenerator::VisitCountOperation(CountOperation* expr) {
       } else {
         EmitVariableAssignment(expr->expression()->AsVariableProxy()->var(),
                                Token::ASSIGN);
+        PrepareForBailoutForId(expr->AssignmentId(), TOS_REG);
+        context()->Plug(r0);
       }
       break;
     case NAMED_PROPERTY: {
@@ -3216,6 +3222,7 @@ void FullCodeGenerator::VisitCountOperation(CountOperation* expr) {
       __ pop(r1);
       Handle<Code> ic(Builtins::builtin(Builtins::StoreIC_Initialize));
       EmitCallIC(ic, RelocInfo::CODE_TARGET);
+      PrepareForBailoutForId(expr->AssignmentId(), TOS_REG);
       if (expr->is_postfix()) {
         if (!context()->IsEffect()) {
           context()->PlugTOS();
@@ -3230,6 +3237,7 @@ void FullCodeGenerator::VisitCountOperation(CountOperation* expr) {
       __ pop(r2);  // Receiver.
       Handle<Code> ic(Builtins::builtin(Builtins::KeyedStoreIC_Initialize));
       EmitCallIC(ic, RelocInfo::CODE_TARGET);
+      PrepareForBailoutForId(expr->AssignmentId(), TOS_REG);
       if (expr->is_postfix()) {
         if (!context()->IsEffect()) {
           context()->PlugTOS();
diff --git a/deps/v8/src/arm/lithium-arm.cc b/deps/v8/src/arm/lithium-arm.cc
index 682c448fd5..ef982f1076 100644
--- a/deps/v8/src/arm/lithium-arm.cc
+++ b/deps/v8/src/arm/lithium-arm.cc
@@ -460,12 +460,6 @@ int LChunk::NearestGapPos(int index) const {
 }
 
 
-int LChunk::NearestNextGapPos(int index) const {
-  while (!IsGapAt(index)) index++;
-  return index;
-}
-
-
 void LChunk::AddGapMove(int index, LOperand* from, LOperand* to) {
   GetGapAt(index)->GetOrCreateParallelMove(LGap::START)->AddMove(from, to);
 }
@@ -1357,6 +1351,9 @@ LInstruction* LChunkBuilder::DoUnaryMathOperation(HUnaryMathOperation* instr) {
       return AssignEnvironment(DefineAsRegister(result));
     case kMathSqrt:
       return DefineSameAsFirst(result);
+    case kMathPowHalf:
+      Abort("MathPowHalf LUnaryMathOperation not implemented");
+      return NULL;
     default:
       UNREACHABLE();
       return NULL;
@@ -1554,6 +1551,12 @@ LInstruction* LChunkBuilder::DoAdd(HAdd* instr) {
 }
 
 
+LInstruction* LChunkBuilder::DoPower(HPower* instr) {
+  Abort("LPower instruction not implemented on ARM");
+  return NULL;
+}
+
+
 LInstruction* LChunkBuilder::DoCompare(HCompare* instr) {
   Token::Value op = instr->token();
   if (instr->left()->representation().IsInteger32()) {
@@ -1688,11 +1691,13 @@ LInstruction* LChunkBuilder::DoChange(HChange* instr) {
   } else if (from.IsDouble()) {
     if (to.IsTagged()) {
       LOperand* value = UseRegister(instr->value());
-      LOperand* temp = TempRegister();
+      LOperand* temp1 = TempRegister();
+      LOperand* temp2 = TempRegister();
 
-      // Make sure that temp and result_temp are different registers.
+      // Make sure that the temp and result_temp registers are
+      // different.
       LUnallocated* result_temp = TempRegister();
-      LInstruction* result = new LNumberTagD(value, temp);
+      LInstruction* result = new LNumberTagD(value, temp1, temp2);
       Define(result, result_temp);
       return AssignPointerMap(result);
     } else {
diff --git a/deps/v8/src/arm/lithium-arm.h b/deps/v8/src/arm/lithium-arm.h
index 0d5ba0f73f..048d4fc80b 100644
--- a/deps/v8/src/arm/lithium-arm.h
+++ b/deps/v8/src/arm/lithium-arm.h
@@ -1395,15 +1395,17 @@ class LNumberTagI: public LUnaryOperation {
 
 class LNumberTagD: public LUnaryOperation {
  public:
-  explicit LNumberTagD(LOperand* value, LOperand* temp)
-      : LUnaryOperation(value), temp_(temp) { }
+  LNumberTagD(LOperand* value, LOperand* temp1, LOperand* temp2)
+      : LUnaryOperation(value), temp1_(temp1), temp2_(temp2) { }
 
   DECLARE_CONCRETE_INSTRUCTION(NumberTagD, "number-tag-d")
 
-  LOperand* temp() const { return temp_; }
+  LOperand* temp1() const { return temp1_; }
+  LOperand* temp2() const { return temp2_; }
 
  private:
-  LOperand* temp_;
+  LOperand* temp1_;
+  LOperand* temp2_;
 };
 
 
@@ -1887,7 +1889,6 @@ class LChunk: public ZoneObject {
   LGap* GetGapAt(int index) const;
   bool IsGapAt(int index) const;
   int NearestGapPos(int index) const;
-  int NearestNextGapPos(int index) const;
   void MarkEmptyBlocks();
   const ZoneList<LPointerMap*>* pointer_maps() const { return &pointer_maps_; }
   LLabel* GetLabel(int block_id) const {
diff --git a/deps/v8/src/arm/lithium-codegen-arm.cc b/deps/v8/src/arm/lithium-codegen-arm.cc
index db8037a62d..5b3f23bb02 100644
--- a/deps/v8/src/arm/lithium-codegen-arm.cc
+++ b/deps/v8/src/arm/lithium-codegen-arm.cc
@@ -136,7 +136,7 @@ bool LCodeGen::GeneratePrologue() {
       Label loop;
       __ bind(&loop);
       __ push(r2);
-      __ sub(r0, r0, Operand(1));
+      __ sub(r0, r0, Operand(1), SetCC);
       __ b(ne, &loop);
     } else {
       __ sub(sp,  sp, Operand(slots * kPointerSize));
@@ -1733,13 +1733,14 @@ void LCodeGen::DoNumberTagD(LNumberTagD* instr) {
 
   DoubleRegister input_reg = ToDoubleRegister(instr->input());
   Register reg = ToRegister(instr->result());
-  Register tmp = ToRegister(instr->temp());
+  Register temp1 = ToRegister(instr->temp1());
+  Register temp2 = ToRegister(instr->temp2());
   Register scratch = r9;
 
   DeferredNumberTagD* deferred = new DeferredNumberTagD(this, instr);
   if (FLAG_inline_new) {
     __ LoadRoot(scratch, Heap::kHeapNumberMapRootIndex);
-    __ AllocateHeapNumber(reg, tmp, ip, scratch, deferred->entry());
+    __ AllocateHeapNumber(reg, temp1, temp2, scratch, deferred->entry());
   } else {
     __ jmp(deferred->entry());
   }
diff --git a/deps/v8/src/arm/macro-assembler-arm.cc b/deps/v8/src/arm/macro-assembler-arm.cc
index 6ad8918f17..6effec1e31 100644
--- a/deps/v8/src/arm/macro-assembler-arm.cc
+++ b/deps/v8/src/arm/macro-assembler-arm.cc
@@ -1060,9 +1060,14 @@ void MacroAssembler::AllocateInNewSpace(Register object_size,
     return;
   }
 
+  // Assert that the register arguments are different and that none of
+  // them are ip. ip is used explicitly in the code generated below.
   ASSERT(!result.is(scratch1));
   ASSERT(!result.is(scratch2));
   ASSERT(!scratch1.is(scratch2));
+  ASSERT(!result.is(ip));
+  ASSERT(!scratch1.is(ip));
+  ASSERT(!scratch2.is(ip));
 
   // Check relative positions of allocation top and limit addresses.
   // The values must be adjacent in memory to allow the use of LDM.
diff --git a/deps/v8/src/array.js b/deps/v8/src/array.js
index c5ff505c1d..a805157b13 100644
--- a/deps/v8/src/array.js
+++ b/deps/v8/src/array.js
@@ -159,9 +159,11 @@ function Join(array, length, separator, convert) {
 }
 
 
-function ConvertToString(e) {
-  if (e == null) return '';
-  else return ToString(e);
+function ConvertToString(x) {
+  if (IS_STRING(x)) return x;
+  if (IS_NUMBER(x)) return %_NumberToString(x);
+  if (IS_BOOLEAN(x)) return x ? 'true' : 'false';
+  return (IS_NULL_OR_UNDEFINED(x)) ? '' : %ToString(%DefaultString(x));
 }
 
 
@@ -365,14 +367,13 @@ function ArrayJoin(separator) {
   if (IS_UNDEFINED(separator)) {
     separator = ',';
   } else if (!IS_STRING(separator)) {
-    separator = ToString(separator);
+    separator = NonStringToString(separator);
   }
 
   var result = %_FastAsciiArrayJoin(this, separator);
   if (!IS_UNDEFINED(result)) return result;
 
-  var length = TO_UINT32(this.length);
-  return Join(this, length, separator, ConvertToString);
+  return Join(this, TO_UINT32(this.length), separator, ConvertToString);
 }
 
 
diff --git a/deps/v8/src/assembler.cc b/deps/v8/src/assembler.cc
index d71a35a4a5..3b44efa9c0 100644
--- a/deps/v8/src/assembler.cc
+++ b/deps/v8/src/assembler.cc
@@ -66,6 +66,7 @@ namespace internal {
 
 const double DoubleConstant::min_int = kMinInt;
 const double DoubleConstant::one_half = 0.5;
+const double DoubleConstant::negative_infinity = -V8_INFINITY;
 
 
 // -----------------------------------------------------------------------------
@@ -722,6 +723,12 @@ ExternalReference ExternalReference::address_of_one_half() {
 }
 
 
+ExternalReference ExternalReference::address_of_negative_infinity() {
+  return ExternalReference(reinterpret_cast<void*>(
+      const_cast<double*>(&DoubleConstant::negative_infinity)));
+}
+
+
 #ifndef V8_INTERPRETED_REGEXP
 
 ExternalReference ExternalReference::re_check_stack_guard_state() {
@@ -793,6 +800,51 @@ static double mod_two_doubles(double x, double y) {
 }
 
 
+// Helper function to compute x^y, where y is known to be an
+// integer. Uses binary decomposition to limit the number of
+// multiplications; see the discussion in "Hacker's Delight" by Henry
+// S. Warren, Jr., figure 11-6, page 213.
+double power_double_int(double x, int y) {
+  double m = (y < 0) ? 1 / x : x;
+  unsigned n = (y < 0) ? -y : y;
+  double p = 1;
+  while (n != 0) {
+    if ((n & 1) != 0) p *= m;
+    m *= m;
+    if ((n & 2) != 0) p *= m;
+    m *= m;
+    n >>= 2;
+  }
+  return p;
+}
+
+
+double power_double_double(double x, double y) {
+  int y_int = static_cast<int>(y);
+  if (y == y_int) {
+    return power_double_int(x, y_int);  // Returns 1.0 for exponent 0.
+  }
+  if (!isinf(x)) {
+    if (y == 0.5) return sqrt(x);
+    if (y == -0.5) return 1.0 / sqrt(x);
+  }
+  if (isnan(y) || ((x == 1 || x == -1) && isinf(y))) {
+    return OS::nan_value();
+  }
+  return pow(x, y);
+}
+
+
+ExternalReference ExternalReference::power_double_double_function() {
+  return ExternalReference(Redirect(FUNCTION_ADDR(power_double_double)));
+}
+
+
+ExternalReference ExternalReference::power_double_int_function() {
+  return ExternalReference(Redirect(FUNCTION_ADDR(power_double_int)));
+}
+
+
 static int native_compare_doubles(double y, double x) {
   if (x == y) return EQUAL;
   return x < y ? LESS : GREATER;
diff --git a/deps/v8/src/assembler.h b/deps/v8/src/assembler.h
index 82c9fc24c5..72a9b15380 100644
--- a/deps/v8/src/assembler.h
+++ b/deps/v8/src/assembler.h
@@ -50,6 +50,7 @@ class DoubleConstant: public AllStatic {
  public:
   static const double min_int;
   static const double one_half;
+  static const double negative_infinity;
 };
 
 
@@ -539,6 +540,8 @@ class ExternalReference BASE_EMBEDDED {
 
   static ExternalReference double_fp_operation(Token::Value operation);
   static ExternalReference compare_doubles();
+  static ExternalReference power_double_double_function();
+  static ExternalReference power_double_int_function();
 
   static ExternalReference handle_scope_next_address();
   static ExternalReference handle_scope_limit_address();
@@ -549,6 +552,7 @@ class ExternalReference BASE_EMBEDDED {
   // Static variables containing common double constants.
   static ExternalReference address_of_min_int();
   static ExternalReference address_of_one_half();
+  static ExternalReference address_of_negative_infinity();
 
   Address address() const {return reinterpret_cast<Address>(address_);}
 
@@ -710,6 +714,10 @@ static inline int NumberOfBitsSet(uint32_t x) {
   return num_bits_set;
 }
 
+// Computes pow(x, y) with the special cases in the spec for Math.pow.
+double power_double_int(double x, int y);
+double power_double_double(double x, double y);
+
 } }  // namespace v8::internal
 
 #endif  // V8_ASSEMBLER_H_
diff --git a/deps/v8/src/ast-inl.h b/deps/v8/src/ast-inl.h
index e88156d6e4..d1017121da 100644
--- a/deps/v8/src/ast-inl.h
+++ b/deps/v8/src/ast-inl.h
@@ -94,7 +94,8 @@ ForStatement::ForStatement(ZoneStringList* labels)
 
 
 ForInStatement::ForInStatement(ZoneStringList* labels)
-    : IterationStatement(labels), each_(NULL), enumerable_(NULL) {
+    : IterationStatement(labels), each_(NULL), enumerable_(NULL),
+      assignment_id_(GetNextId()) {
 }
 
 
diff --git a/deps/v8/src/ast.cc b/deps/v8/src/ast.cc
index c1ea0a8b3d..7ddb01e3e4 100644
--- a/deps/v8/src/ast.cc
+++ b/deps/v8/src/ast.cc
@@ -125,17 +125,18 @@ Assignment::Assignment(Token::Value op,
       target_(target),
       value_(value),
       pos_(pos),
-      compound_bailout_id_(kNoNumber),
+      binary_operation_(NULL),
+      compound_load_id_(kNoNumber),
+      assignment_id_(GetNextId()),
       block_start_(false),
       block_end_(false),
       is_monomorphic_(false),
       receiver_types_(NULL) {
   ASSERT(Token::IsAssignmentOp(op));
-  binary_operation_ = is_compound()
-      ? new BinaryOperation(binary_op(), target, value, pos + 1)
-      : NULL;
   if (is_compound()) {
-    compound_bailout_id_ = GetNextId();
+    binary_operation_ =
+        new BinaryOperation(binary_op(), target, value, pos + 1);
+    compound_load_id_ = GetNextId();
   }
 }
 
diff --git a/deps/v8/src/ast.h b/deps/v8/src/ast.h
index cdf456f67b..c33838e011 100644
--- a/deps/v8/src/ast.h
+++ b/deps/v8/src/ast.h
@@ -435,7 +435,6 @@ class IterationStatement: public BreakableStatement {
   virtual IterationStatement* AsIterationStatement() { return this; }
 
   Statement* body() const { return body_; }
-  void set_body(Statement* stmt) { body_ = stmt; }
 
   // Bailout support.
   int OsrEntryId() const { return osr_entry_id_; }
@@ -532,11 +531,8 @@ class ForStatement: public IterationStatement {
   }
 
   Statement* init() const { return init_; }
-  void set_init(Statement* stmt) { init_ = stmt; }
   Expression* cond() const { return cond_; }
-  void set_cond(Expression* expr) { cond_ = expr; }
   Statement* next() const { return next_; }
-  void set_next(Statement* stmt) { next_ = stmt; }
 
   bool may_have_function_literal() const {
     return may_have_function_literal_;
@@ -579,11 +575,13 @@ class ForInStatement: public IterationStatement {
   Expression* enumerable() const { return enumerable_; }
 
   // Bailout support.
+  int AssignmentId() const { return assignment_id_; }
   virtual int ContinueId() const { return EntryId(); }
 
  private:
   Expression* each_;
   Expression* enumerable_;
+  int assignment_id_;
 };
 
 
@@ -748,9 +746,7 @@ class IfStatement: public Statement {
 
   Expression* condition() const { return condition_; }
   Statement* then_statement() const { return then_statement_; }
-  void set_then_statement(Statement* stmt) { then_statement_ = stmt; }
   Statement* else_statement() const { return else_statement_; }
-  void set_else_statement(Statement* stmt) { else_statement_ = stmt; }
 
  private:
   Expression* condition_;
@@ -1432,7 +1428,9 @@ class IncrementOperation: public Expression {
 class CountOperation: public Expression {
  public:
   CountOperation(bool is_prefix, IncrementOperation* increment, int pos)
-      : is_prefix_(is_prefix), increment_(increment), pos_(pos) { }
+      : is_prefix_(is_prefix), increment_(increment), pos_(pos),
+        assignment_id_(GetNextId()) {
+  }
 
   DECLARE_NODE_TYPE(CountOperation)
 
@@ -1452,10 +1450,14 @@ class CountOperation: public Expression {
 
   virtual bool IsInlineable() const;
 
+  // Bailout support.
+  int AssignmentId() const { return assignment_id_; }
+
  private:
   bool is_prefix_;
   IncrementOperation* increment_;
   int pos_;
+  int assignment_id_;
 };
 
 
@@ -1585,7 +1587,8 @@ class Assignment: public Expression {
   }
 
   // Bailout support.
-  int compound_bailout_id() const { return compound_bailout_id_; }
+  int CompoundLoadId() const { return compound_load_id_; }
+  int AssignmentId() const { return assignment_id_; }
 
  private:
   Token::Value op_;
@@ -1593,7 +1596,8 @@ class Assignment: public Expression {
   Expression* value_;
   int pos_;
   BinaryOperation* binary_operation_;
-  int compound_bailout_id_;
+  int compound_load_id_;
+  int assignment_id_;
 
   bool block_start_;
   bool block_end_;
diff --git a/deps/v8/src/checks.h b/deps/v8/src/checks.h
index aa557f00bc..8d13d65f6e 100644
--- a/deps/v8/src/checks.h
+++ b/deps/v8/src/checks.h
@@ -231,6 +231,8 @@ static inline void CheckNonEqualsHelper(const char* file,
 
 #define CHECK_GT(a, b) CHECK((a) > (b))
 #define CHECK_GE(a, b) CHECK((a) >= (b))
+#define CHECK_LT(a, b) CHECK((a) < (b))
+#define CHECK_LE(a, b) CHECK((a) <= (b))
 
 
 // This is inspired by the static assertion facility in boost.  This
diff --git a/deps/v8/src/compiler.cc b/deps/v8/src/compiler.cc
index 59a684c69f..e4864e4801 100755
--- a/deps/v8/src/compiler.cc
+++ b/deps/v8/src/compiler.cc
@@ -116,13 +116,26 @@ static bool AlwaysFullCompiler() {
 static void FinishOptimization(Handle<JSFunction> function, int64_t start) {
   int opt_count = function->shared()->opt_count();
   function->shared()->set_opt_count(opt_count + 1);
-  if (!FLAG_trace_opt) return;
-
   double ms = static_cast<double>(OS::Ticks() - start) / 1000;
-  PrintF("[optimizing: ");
-  function->PrintName();
-  PrintF(" / %" V8PRIxPTR, reinterpret_cast<intptr_t>(*function));
-  PrintF(" - took %0.3f ms]\n", ms);
+  if (FLAG_trace_opt) {
+    PrintF("[optimizing: ");
+    function->PrintName();
+    PrintF(" / %" V8PRIxPTR, reinterpret_cast<intptr_t>(*function));
+    PrintF(" - took %0.3f ms]\n", ms);
+  }
+  if (FLAG_trace_opt_stats) {
+    static double compilation_time = 0.0;
+    static int compiled_functions = 0;
+    static int code_size = 0;
+
+    compilation_time += ms;
+    compiled_functions++;
+    code_size += function->shared()->SourceSize();
+    PrintF("Compiled: %d functions with %d byte source size in %fms.\n",
+           compiled_functions,
+           code_size,
+           compilation_time);
+  }
 }
 
 
@@ -461,7 +474,14 @@ Handle<SharedFunctionInfo> Compiler::Compile(Handle<String> source,
     ScriptDataImpl* pre_data = input_pre_data;
     if (pre_data == NULL
         && source_length >= FLAG_min_preparse_length) {
-      pre_data = ParserApi::PartialPreParse(source, NULL, extension);
+      if (source->IsExternalTwoByteString()) {
+        ExternalTwoByteStringUC16CharacterStream stream(
+            Handle<ExternalTwoByteString>::cast(source), 0, source->length());
+        pre_data = ParserApi::PartialPreParse(&stream, extension);
+      } else {
+        GenericStringUC16CharacterStream stream(source, 0, source->length());
+        pre_data = ParserApi::PartialPreParse(&stream, extension);
+      }
     }
 
     // Create a script object describing the script to be compiled.
diff --git a/deps/v8/src/extensions/experimental/i18n-extension.cc b/deps/v8/src/extensions/experimental/i18n-extension.cc
new file mode 100644
index 0000000000..22a1c912d0
--- /dev/null
+++ b/deps/v8/src/extensions/experimental/i18n-extension.cc
@@ -0,0 +1,263 @@
+// Copyright 2010 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
+//       disclaimer in the documentation and/or other materials provided
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include "i18n-extension.h"
+
+#include <algorithm>
+#include <string>
+
+#include "unicode/locid.h"
+#include "unicode/uloc.h"
+
+namespace v8 {
+namespace internal {
+
+I18NExtension* I18NExtension::extension_ = NULL;
+
+// TODO(cira): maybe move JS code to a .js file and generata cc files from it?
+const char* const I18NExtension::kSource =
+  "Locale = function(optLocale) {"
+  "  native function NativeJSLocale();"
+  "  var properties = NativeJSLocale(optLocale);"
+  "  this.locale = properties.locale;"
+  "  this.language = properties.language;"
+  "  this.script = properties.script;"
+  "  this.region = properties.region;"
+  "};"
+  "Locale.availableLocales = function() {"
+  "  native function NativeJSAvailableLocales();"
+  "  return NativeJSAvailableLocales();"
+  "};"
+  "Locale.prototype.maximizedLocale = function() {"
+  "  native function NativeJSMaximizedLocale();"
+  "  return new Locale(NativeJSMaximizedLocale(this.locale));"
+  "};"
+  "Locale.prototype.minimizedLocale = function() {"
+  "  native function NativeJSMinimizedLocale();"
+  "  return new Locale(NativeJSMinimizedLocale(this.locale));"
+  "};"
+  "Locale.prototype.displayLocale_ = function(displayLocale) {"
+  "  var result = this.locale;"
+  "  if (displayLocale !== undefined) {"
+  "    result = displayLocale.locale;"
+  "  }"
+  "  return result;"
+  "};"
+  "Locale.prototype.displayLanguage = function(optDisplayLocale) {"
+  "  var displayLocale = this.displayLocale_(optDisplayLocale);"
+  "  native function NativeJSDisplayLanguage();"
+  "  return NativeJSDisplayLanguage(this.locale, displayLocale);"
+  "};"
+  "Locale.prototype.displayScript = function(optDisplayLocale) {"
+  "  var displayLocale = this.displayLocale_(optDisplayLocale);"
+  "  native function NativeJSDisplayScript();"
+  "  return NativeJSDisplayScript(this.locale, displayLocale);"
+  "};"
+  "Locale.prototype.displayRegion = function(optDisplayLocale) {"
+  "  var displayLocale = this.displayLocale_(optDisplayLocale);"
+  "  native function NativeJSDisplayRegion();"
+  "  return NativeJSDisplayRegion(this.locale, displayLocale);"
+  "};"
+  "Locale.prototype.displayName = function(optDisplayLocale) {"
+  "  var displayLocale = this.displayLocale_(optDisplayLocale);"
+  "  native function NativeJSDisplayName();"
+  "  return NativeJSDisplayName(this.locale, displayLocale);"
+  "};";
+
+v8::Handle<v8::FunctionTemplate> I18NExtension::GetNativeFunction(
+    v8::Handle<v8::String> name) {
+  if (name->Equals(v8::String::New("NativeJSLocale"))) {
+    return v8::FunctionTemplate::New(JSLocale);
+  } else if (name->Equals(v8::String::New("NativeJSAvailableLocales"))) {
+    return v8::FunctionTemplate::New(JSAvailableLocales);
+  } else if (name->Equals(v8::String::New("NativeJSMaximizedLocale"))) {
+    return v8::FunctionTemplate::New(JSMaximizedLocale);
+  } else if (name->Equals(v8::String::New("NativeJSMinimizedLocale"))) {
+    return v8::FunctionTemplate::New(JSMinimizedLocale);
+  } else if (name->Equals(v8::String::New("NativeJSDisplayLanguage"))) {
+    return v8::FunctionTemplate::New(JSDisplayLanguage);
+  } else if (name->Equals(v8::String::New("NativeJSDisplayScript"))) {
+    return v8::FunctionTemplate::New(JSDisplayScript);
+  } else if (name->Equals(v8::String::New("NativeJSDisplayRegion"))) {
+    return v8::FunctionTemplate::New(JSDisplayRegion);
+  } else if (name->Equals(v8::String::New("NativeJSDisplayName"))) {
+    return v8::FunctionTemplate::New(JSDisplayName);
+  }
+
+  return v8::Handle<v8::FunctionTemplate>();
+}
+
+v8::Handle<v8::Value> I18NExtension::JSLocale(const v8::Arguments& args) {
+  // TODO(cira): Fetch browser locale. Accept en-US as good default for now.
+  // We could possibly pass browser locale as a parameter in the constructor.
+  std::string locale_name("en-US");
+  if (args.Length() == 1 && args[0]->IsString()) {
+    locale_name = *v8::String::Utf8Value(args[0]->ToString());
+  }
+
+  v8::Local<v8::Object> locale = v8::Object::New();
+  locale->Set(v8::String::New("locale"), v8::String::New(locale_name.c_str()));
+
+  icu::Locale icu_locale(locale_name.c_str());
+
+  const char* language = icu_locale.getLanguage();
+  locale->Set(v8::String::New("language"), v8::String::New(language));
+
+  const char* script = icu_locale.getScript();
+  if (strlen(script)) {
+    locale->Set(v8::String::New("script"), v8::String::New(script));
+  }
+
+  const char* region = icu_locale.getCountry();
+  if (strlen(region)) {
+    locale->Set(v8::String::New("region"), v8::String::New(region));
+  }
+
+  return locale;
+}
+
+// TODO(cira): Filter out locales that Chrome doesn't support.
+v8::Handle<v8::Value> I18NExtension::JSAvailableLocales(
+    const v8::Arguments& args) {
+  v8::Local<v8::Array> all_locales = v8::Array::New();
+
+  int count = 0;
+  const Locale* icu_locales = icu::Locale::getAvailableLocales(count);
+  for (int i = 0; i < count; ++i) {
+    all_locales->Set(i, v8::String::New(icu_locales[i].getName()));
+  }
+
+  return all_locales;
+}
+
+// Use - as tag separator, not _ that ICU uses.
+static std::string NormalizeLocale(const std::string& locale) {
+  std::string result(locale);
+  // TODO(cira): remove STL dependency.
+  std::replace(result.begin(), result.end(), '_', '-');
+  return result;
+}
+
+v8::Handle<v8::Value> I18NExtension::JSMaximizedLocale(
+    const v8::Arguments& args) {
+  if (!args.Length() || !args[0]->IsString()) {
+    return v8::Undefined();
+  }
+
+  UErrorCode status = U_ZERO_ERROR;
+  std::string locale_name = *v8::String::Utf8Value(args[0]->ToString());
+  char max_locale[ULOC_FULLNAME_CAPACITY];
+  uloc_addLikelySubtags(locale_name.c_str(), max_locale,
+                        sizeof(max_locale), &status);
+  if (U_FAILURE(status)) {
+    return v8::Undefined();
+  }
+
+  return v8::String::New(NormalizeLocale(max_locale).c_str());
+}
+
+v8::Handle<v8::Value> I18NExtension::JSMinimizedLocale(
+    const v8::Arguments& args) {
+  if (!args.Length() || !args[0]->IsString()) {
+    return v8::Undefined();
+  }
+
+  UErrorCode status = U_ZERO_ERROR;
+  std::string locale_name = *v8::String::Utf8Value(args[0]->ToString());
+  char min_locale[ULOC_FULLNAME_CAPACITY];
+  uloc_minimizeSubtags(locale_name.c_str(), min_locale,
+                       sizeof(min_locale), &status);
+  if (U_FAILURE(status)) {
+    return v8::Undefined();
+  }
+
+  return v8::String::New(NormalizeLocale(min_locale).c_str());
+}
+
+// Common code for JSDisplayXXX methods.
+static v8::Handle<v8::Value> GetDisplayItem(const v8::Arguments& args,
+                                            const std::string& item) {
+  if (args.Length() != 2 || !args[0]->IsString() || !args[1]->IsString()) {
+    return v8::Undefined();
+  }
+
+  std::string base_locale = *v8::String::Utf8Value(args[0]->ToString());
+  icu::Locale icu_locale(base_locale.c_str());
+  icu::Locale display_locale =
+      icu::Locale(*v8::String::Utf8Value(args[1]->ToString()));
+  UnicodeString result;
+  if (item == "language") {
+    icu_locale.getDisplayLanguage(display_locale, result);
+  } else if (item == "script") {
+    icu_locale.getDisplayScript(display_locale, result);
+  } else if (item == "region") {
+    icu_locale.getDisplayCountry(display_locale, result);
+  } else if (item == "name") {
+    icu_locale.getDisplayName(display_locale, result);
+  } else {
+    return v8::Undefined();
+  }
+
+  if (result.length()) {
+    return v8::String::New(
+        reinterpret_cast<const uint16_t*>(result.getBuffer()), result.length());
+  }
+
+  return v8::Undefined();
+}
+
+v8::Handle<v8::Value> I18NExtension::JSDisplayLanguage(
+    const v8::Arguments& args) {
+  return GetDisplayItem(args, "language");
+}
+
+v8::Handle<v8::Value> I18NExtension::JSDisplayScript(
+    const v8::Arguments& args) {
+  return GetDisplayItem(args, "script");
+}
+
+v8::Handle<v8::Value> I18NExtension::JSDisplayRegion(
+    const v8::Arguments& args) {
+  return GetDisplayItem(args, "region");
+}
+
+v8::Handle<v8::Value> I18NExtension::JSDisplayName(const v8::Arguments& args) {
+  return GetDisplayItem(args, "name");
+}
+
+I18NExtension* I18NExtension::get() {
+  if (!extension_) {
+    extension_ = new I18NExtension();
+  }
+  return extension_;
+}
+
+void I18NExtension::Register() {
+  static v8::DeclareExtension i18n_extension_declaration(I18NExtension::get());
+}
+
+} }  // namespace v8::internal
diff --git a/deps/v8/src/extensions/experimental/i18n-extension.h b/deps/v8/src/extensions/experimental/i18n-extension.h
new file mode 100644
index 0000000000..629332babb
--- /dev/null
+++ b/deps/v8/src/extensions/experimental/i18n-extension.h
@@ -0,0 +1,64 @@
+// Copyright 2010 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
+//       disclaimer in the documentation and/or other materials provided
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef V8_EXTENSIONS_EXPERIMENTAL_I18N_EXTENSION_H_
+#define V8_EXTENSIONS_EXPERIMENTAL_I18N_EXTENSION_H_
+
+#include <v8.h>
+
+namespace v8 {
+namespace internal {
+
+
+class I18NExtension : public v8::Extension {
+ public:
+  I18NExtension() : v8::Extension("v8/i18n", kSource) {}
+  virtual v8::Handle<v8::FunctionTemplate> GetNativeFunction(
+      v8::Handle<v8::String> name);
+
+  // Implementations of window.Locale methods.
+  static v8::Handle<v8::Value> JSLocale(const v8::Arguments& args);
+  static v8::Handle<v8::Value> JSAvailableLocales(const v8::Arguments& args);
+  static v8::Handle<v8::Value> JSMaximizedLocale(const v8::Arguments& args);
+  static v8::Handle<v8::Value> JSMinimizedLocale(const v8::Arguments& args);
+  static v8::Handle<v8::Value> JSDisplayLanguage(const v8::Arguments& args);
+  static v8::Handle<v8::Value> JSDisplayScript(const v8::Arguments& args);
+  static v8::Handle<v8::Value> JSDisplayRegion(const v8::Arguments& args);
+  static v8::Handle<v8::Value> JSDisplayName(const v8::Arguments& args);
+
+  // V8 code prefers Register, while Chrome and WebKit use get kind of methods.
+  static void Register();
+  static I18NExtension* get();
+
+ private:
+  static const char* const kSource;
+  static I18NExtension* extension_;
+};
+
+} }  // namespace v8::internal
+
+#endif  // V8_EXTENSIONS_EXPERIMENTAL_I18N_EXTENSION_H_
diff --git a/deps/v8/src/flag-definitions.h b/deps/v8/src/flag-definitions.h
index 37653a4a15..fc5fe1ee0f 100644
--- a/deps/v8/src/flag-definitions.h
+++ b/deps/v8/src/flag-definitions.h
@@ -194,6 +194,7 @@ DEFINE_bool(mask_constants_with_cookie,
 // codegen.cc
 DEFINE_bool(lazy, true, "use lazy compilation")
 DEFINE_bool(trace_opt, false, "trace lazy optimization")
+DEFINE_bool(trace_opt_stats, false, "trace lazy optimization statistics")
 DEFINE_bool(opt, true, "use adaptive optimizations")
 DEFINE_bool(opt_eagerly, false, "be more eager when adaptively optimizing")
 DEFINE_bool(always_opt, false, "always try to optimize functions")
@@ -456,8 +457,6 @@ DEFINE_bool(log_snapshot_positions, false,
             "log positions of (de)serialized objects in the snapshot.")
 DEFINE_bool(log_suspect, false, "Log suspect operations.")
 DEFINE_bool(log_producers, false, "Log stack traces of JS objects allocations.")
-DEFINE_bool(compress_log, false,
-            "Compress log to save space (makes log less human-readable).")
 DEFINE_bool(prof, false,
             "Log statistical profiling information (implies --log-code).")
 DEFINE_bool(prof_auto, true,
diff --git a/deps/v8/src/full-codegen.h b/deps/v8/src/full-codegen.h
index 8d9fe2d332..e0fd192a21 100644
--- a/deps/v8/src/full-codegen.h
+++ b/deps/v8/src/full-codegen.h
@@ -481,7 +481,7 @@ class FullCodeGenerator: public AstVisitor {
 
   // Assign to the given expression as if via '='. The right-hand-side value
   // is expected in the accumulator.
-  void EmitAssignment(Expression* expr);
+  void EmitAssignment(Expression* expr, int bailout_ast_id);
 
   // Complete a variable assignment.  The right-hand-side value is expected
   // in the accumulator.
diff --git a/deps/v8/src/heap-profiler.cc b/deps/v8/src/heap-profiler.cc
index 91ac9867a2..6700d38b25 100644
--- a/deps/v8/src/heap-profiler.cc
+++ b/deps/v8/src/heap-profiler.cc
@@ -348,27 +348,34 @@ void HeapProfiler::TearDown() {
 
 #ifdef ENABLE_LOGGING_AND_PROFILING
 
-HeapSnapshot* HeapProfiler::TakeSnapshot(const char* name, int type) {
+HeapSnapshot* HeapProfiler::TakeSnapshot(const char* name,
+                                         int type,
+                                         v8::ActivityControl* control) {
   ASSERT(singleton_ != NULL);
-  return singleton_->TakeSnapshotImpl(name, type);
+  return singleton_->TakeSnapshotImpl(name, type, control);
 }
 
 
-HeapSnapshot* HeapProfiler::TakeSnapshot(String* name, int type) {
+HeapSnapshot* HeapProfiler::TakeSnapshot(String* name,
+                                         int type,
+                                         v8::ActivityControl* control) {
   ASSERT(singleton_ != NULL);
-  return singleton_->TakeSnapshotImpl(name, type);
+  return singleton_->TakeSnapshotImpl(name, type, control);
 }
 
 
-HeapSnapshot* HeapProfiler::TakeSnapshotImpl(const char* name, int type) {
+HeapSnapshot* HeapProfiler::TakeSnapshotImpl(const char* name,
+                                             int type,
+                                             v8::ActivityControl* control) {
   Heap::CollectAllGarbage(true);
   HeapSnapshot::Type s_type = static_cast<HeapSnapshot::Type>(type);
   HeapSnapshot* result =
       snapshots_->NewSnapshot(s_type, name, next_snapshot_uid_++);
+  bool generation_completed = true;
   switch (s_type) {
     case HeapSnapshot::kFull: {
-      HeapSnapshotGenerator generator(result);
-      generator.GenerateSnapshot();
+      HeapSnapshotGenerator generator(result, control);
+      generation_completed = generator.GenerateSnapshot();
       break;
     }
     case HeapSnapshot::kAggregated: {
@@ -381,13 +388,19 @@ HeapSnapshot* HeapProfiler::TakeSnapshotImpl(const char* name, int type) {
     default:
       UNREACHABLE();
   }
-  snapshots_->SnapshotGenerationFinished();
+  if (!generation_completed) {
+    delete result;
+    result = NULL;
+  }
+  snapshots_->SnapshotGenerationFinished(result);
   return result;
 }
 
 
-HeapSnapshot* HeapProfiler::TakeSnapshotImpl(String* name, int type) {
-  return TakeSnapshotImpl(snapshots_->GetName(name), type);
+HeapSnapshot* HeapProfiler::TakeSnapshotImpl(String* name,
+                                             int type,
+                                             v8::ActivityControl* control) {
+  return TakeSnapshotImpl(snapshots_->GetName(name), type, control);
 }
 
 
diff --git a/deps/v8/src/heap-profiler.h b/deps/v8/src/heap-profiler.h
index 2ef081ee29..31d0aff02f 100644
--- a/deps/v8/src/heap-profiler.h
+++ b/deps/v8/src/heap-profiler.h
@@ -56,8 +56,12 @@ class HeapProfiler {
   static void TearDown();
 
 #ifdef ENABLE_LOGGING_AND_PROFILING
-  static HeapSnapshot* TakeSnapshot(const char* name, int type);
-  static HeapSnapshot* TakeSnapshot(String* name, int type);
+  static HeapSnapshot* TakeSnapshot(const char* name,
+                                    int type,
+                                    v8::ActivityControl* control);
+  static HeapSnapshot* TakeSnapshot(String* name,
+                                    int type,
+                                    v8::ActivityControl* control);
   static int GetSnapshotsCount();
   static HeapSnapshot* GetSnapshot(int index);
   static HeapSnapshot* FindSnapshot(unsigned uid);
@@ -75,8 +79,12 @@ class HeapProfiler {
  private:
   HeapProfiler();
   ~HeapProfiler();
-  HeapSnapshot* TakeSnapshotImpl(const char* name, int type);
-  HeapSnapshot* TakeSnapshotImpl(String* name, int type);
+  HeapSnapshot* TakeSnapshotImpl(const char* name,
+                                 int type,
+                                 v8::ActivityControl* control);
+  HeapSnapshot* TakeSnapshotImpl(String* name,
+                                 int type,
+                                 v8::ActivityControl* control);
 
   HeapSnapshotsCollection* snapshots_;
   unsigned next_snapshot_uid_;
diff --git a/deps/v8/src/heap.cc b/deps/v8/src/heap.cc
index 0497ad5f6a..ccf9b47a35 100644
--- a/deps/v8/src/heap.cc
+++ b/deps/v8/src/heap.cc
@@ -3757,14 +3757,21 @@ bool Heap::IdleNotification() {
   static const int kIdlesBeforeScavenge = 4;
   static const int kIdlesBeforeMarkSweep = 7;
   static const int kIdlesBeforeMarkCompact = 8;
+  static const int kMaxIdleCount = kIdlesBeforeMarkCompact + 1;
+  static const int kGCsBetweenCleanup = 4;
   static int number_idle_notifications = 0;
   static int last_gc_count = gc_count_;
 
   bool uncommit = true;
   bool finished = false;
 
-  if (last_gc_count == gc_count_) {
-    number_idle_notifications++;
+  // Reset the number of idle notifications received when a number of
+  // GCs have taken place. This allows another round of cleanup based
+  // on idle notifications if enough work has been carried out to
+  // provoke a number of garbage collections.
+  if (gc_count_ < last_gc_count + kGCsBetweenCleanup) {
+    number_idle_notifications =
+        Min(number_idle_notifications + 1, kMaxIdleCount);
   } else {
     number_idle_notifications = 0;
     last_gc_count = gc_count_;
@@ -3779,7 +3786,6 @@ bool Heap::IdleNotification() {
     }
     new_space_.Shrink();
     last_gc_count = gc_count_;
-
   } else if (number_idle_notifications == kIdlesBeforeMarkSweep) {
     // Before doing the mark-sweep collections we clear the
     // compilation cache to avoid hanging on to source code and
@@ -3794,7 +3800,6 @@ bool Heap::IdleNotification() {
     CollectAllGarbage(true);
     new_space_.Shrink();
     last_gc_count = gc_count_;
-    number_idle_notifications = 0;
     finished = true;
 
   } else if (contexts_disposed_ > 0) {
@@ -3813,6 +3818,11 @@ bool Heap::IdleNotification() {
       number_idle_notifications = 0;
       uncommit = false;
     }
+  } else if (number_idle_notifications > kIdlesBeforeMarkCompact) {
+    // If we have received more than kIdlesBeforeMarkCompact idle
+    // notifications we do not perform any cleanup because we don't
+    // expect to gain much by doing so.
+    finished = true;
   }
 
   // Make sure that we have no pending context disposals and
diff --git a/deps/v8/src/heap.h b/deps/v8/src/heap.h
index e4dcb4ad7d..06b3ee4689 100644
--- a/deps/v8/src/heap.h
+++ b/deps/v8/src/heap.h
@@ -1119,9 +1119,9 @@ class Heap : public AllStatic {
   static int contexts_disposed_;
 
 #if defined(V8_TARGET_ARCH_X64)
-  static const int kMaxObjectSizeInNewSpace = 512*KB;
+  static const int kMaxObjectSizeInNewSpace = 1024*KB;
 #else
-  static const int kMaxObjectSizeInNewSpace = 256*KB;
+  static const int kMaxObjectSizeInNewSpace = 512*KB;
 #endif
 
   static NewSpace new_space_;
diff --git a/deps/v8/src/hydrogen-instructions.h b/deps/v8/src/hydrogen-instructions.h
index ff1ab1a36e..34316319aa 100644
--- a/deps/v8/src/hydrogen-instructions.h
+++ b/deps/v8/src/hydrogen-instructions.h
@@ -77,6 +77,7 @@ class LChunkBuilder;
 //         HLoadKeyedFastElement
 //         HLoadKeyedGeneric
 //       HLoadNamedGeneric
+//       HPower
 //       HStoreNamed
 //         HStoreNamedField
 //         HStoreNamedGeneric
@@ -223,6 +224,7 @@ class LChunkBuilder;
   V(ObjectLiteral)                             \
   V(OsrEntry)                                  \
   V(Parameter)                                 \
+  V(Power)                                     \
   V(PushArgument)                              \
   V(RegExpLiteral)                             \
   V(Return)                                    \
@@ -1377,6 +1379,7 @@ class HUnaryMathOperation: public HUnaryOperation {
         SetFlag(kFlexibleRepresentation);
         break;
       case kMathSqrt:
+      case kMathPowHalf:
       default:
         set_representation(Representation::Double());
     }
@@ -1395,6 +1398,7 @@ class HUnaryMathOperation: public HUnaryOperation {
       case kMathRound:
       case kMathCeil:
       case kMathSqrt:
+      case kMathPowHalf:
         return Representation::Double();
         break;
       case kMathAbs:
@@ -2184,6 +2188,22 @@ class HInstanceOf: public HBinaryOperation {
 };
 
 
+class HPower: public HBinaryOperation {
+ public:
+  HPower(HValue* left, HValue* right)
+      : HBinaryOperation(left, right) {
+    set_representation(Representation::Double());
+    SetFlag(kUseGVN);
+  }
+
+  virtual Representation RequiredInputRepresentation(int index) const {
+    return (index == 1) ? Representation::None() : Representation::Double();
+  }
+
+  DECLARE_CONCRETE_INSTRUCTION(Power, "power")
+};
+
+
 class HAdd: public HArithmeticBinaryOperation {
  public:
   HAdd(HValue* left, HValue* right) : HArithmeticBinaryOperation(left, right) {
diff --git a/deps/v8/src/hydrogen.cc b/deps/v8/src/hydrogen.cc
index 0e8c4760dd..bc49f06a20 100644
--- a/deps/v8/src/hydrogen.cc
+++ b/deps/v8/src/hydrogen.cc
@@ -1983,6 +1983,9 @@ void HGraph::InsertRepresentationChanges() {
 AstContext::AstContext(HGraphBuilder* owner, Expression::Context kind)
     : owner_(owner), kind_(kind), outer_(owner->ast_context()) {
   owner->set_ast_context(this);  // Push.
+#ifdef DEBUG
+  original_count_ = owner->environment()->total_count();
+#endif
 }
 
 
@@ -1991,6 +1994,101 @@ AstContext::~AstContext() {
 }
 
 
+EffectContext::~EffectContext() {
+  ASSERT(owner()->HasStackOverflow() ||
+         !owner()->subgraph()->HasExit() ||
+         owner()->environment()->total_count() == original_count_);
+}
+
+
+ValueContext::~ValueContext() {
+  ASSERT(owner()->HasStackOverflow() ||
+         !owner()->subgraph()->HasExit() ||
+         owner()->environment()->total_count() == original_count_ + 1);
+}
+
+
+void EffectContext::ReturnValue(HValue* value) {
+  // The value is simply ignored.
+}
+
+
+void ValueContext::ReturnValue(HValue* value) {
+  // The value is tracked in the bailout environment, and communicated
+  // through the environment as the result of the expression.
+  owner()->Push(value);
+}
+
+
+void TestContext::ReturnValue(HValue* value) {
+  BuildBranch(value);
+}
+
+
+void EffectContext::ReturnInstruction(HInstruction* instr, int ast_id) {
+  owner()->AddInstruction(instr);
+  if (instr->HasSideEffects()) owner()->AddSimulate(ast_id);
+}
+
+
+void ValueContext::ReturnInstruction(HInstruction* instr, int ast_id) {
+  owner()->AddInstruction(instr);
+  owner()->Push(instr);
+  if (instr->HasSideEffects()) owner()->AddSimulate(ast_id);
+}
+
+
+void TestContext::ReturnInstruction(HInstruction* instr, int ast_id) {
+  HGraphBuilder* builder = owner();
+  builder->AddInstruction(instr);
+  // We expect a simulate after every expression with side effects, though
+  // this one isn't actually needed (and wouldn't work if it were targeted).
+  if (instr->HasSideEffects()) {
+    builder->Push(instr);
+    builder->AddSimulate(ast_id);
+    builder->Pop();
+  }
+  BuildBranch(instr);
+}
+
+
+void TestContext::BuildBranch(HValue* value) {
+  HGraphBuilder* builder = owner();
+  HBasicBlock* materialize_true = builder->graph()->CreateBasicBlock();
+  HBasicBlock* materialize_false = builder->graph()->CreateBasicBlock();
+  HBranch* branch = new HBranch(materialize_true, materialize_false, value);
+  builder->CurrentBlock()->Finish(branch);
+
+  HBasicBlock* true_block = if_true();
+  HValue* true_value = invert_true()
+      ? builder->graph()->GetConstantFalse()
+      : builder->graph()->GetConstantTrue();
+  materialize_true->set_inverted(invert_true());
+  true_block->set_deopt_predecessor(materialize_true);
+
+  if (true_block->IsInlineReturnTarget()) {
+    materialize_true->AddLeaveInlined(true_value, true_block);
+  } else {
+    materialize_true->last_environment()->Push(true_value);
+    materialize_true->Goto(true_block);
+  }
+
+  HBasicBlock* false_block = if_false();
+  HValue* false_value = invert_false()
+      ? builder->graph()->GetConstantTrue()
+      : builder->graph()->GetConstantFalse();
+  materialize_false->set_inverted(invert_false());
+  false_block->set_deopt_predecessor(materialize_false);
+
+  if (false_block->IsInlineReturnTarget()) {
+    materialize_false->AddLeaveInlined(false_value, false_block);
+  } else {
+    materialize_false->last_environment()->Push(false_value);
+    materialize_false->Goto(false_block);
+  }
+  builder->subgraph()->set_exit_block(NULL);
+}
+
 
 // HGraphBuilder infrastructure for bailing out and checking bailouts.
 #define BAILOUT(reason)                         \
@@ -2061,55 +2159,14 @@ void HGraphBuilder::Bailout(const char* reason) {
 
 
 void HGraphBuilder::VisitForEffect(Expression* expr) {
-#ifdef DEBUG
-  int original_count = environment()->total_count();
-#endif
-  BinaryOperation* binary_op = expr->AsBinaryOperation();
-
-  // We use special casing for expression types not handled properly by our
-  // usual trick of pretending they're in a value context and cleaning up
-  // later.
-  if (binary_op != NULL && binary_op->op() == Token::COMMA) {
-    VISIT_FOR_EFFECT(binary_op->left());
-    VISIT_FOR_EFFECT(binary_op->right());
-  } else {
-    { EffectContext for_effect(this);
-      Visit(expr);
-    }
-    if (HasStackOverflow() || !subgraph()->HasExit()) return;
-    // Discard return value.
-    Pop();
-    // TODO(kasperl): Try to improve the way we compute the last added
-    // instruction. The NULL check makes me uncomfortable.
-    HValue* last = subgraph()->exit_block()->GetLastInstruction();
-    // We need to ensure we emit a simulate after inlined functions in an
-    // effect context, to avoid having a bailout target the fictional
-    // environment with the return value on top.
-    if ((last != NULL && last->HasSideEffects()) ||
-        subgraph()->exit_block()->IsInlineReturnTarget()) {
-      AddSimulate(expr->id());
-    }
-  }
-
-  ASSERT(environment()->total_count() == original_count);
+  EffectContext for_effect(this);
+  Visit(expr);
 }
 
 
 void HGraphBuilder::VisitForValue(Expression* expr) {
-#ifdef DEBUG
-  int original_height = environment()->values()->length();
-#endif
-  { ValueContext for_value(this);
-    Visit(expr);
-  }
-  if (HasStackOverflow() || !subgraph()->HasExit()) return;
-  // TODO(kasperl): Try to improve the way we compute the last added
-  // instruction. The NULL check makes me uncomfortable.
-  HValue* last = subgraph()->exit_block()->GetLastInstruction();
-  if (last != NULL && last->HasSideEffects()) {
-    AddSimulate(expr->id());
-  }
-  ASSERT(environment()->values()->length() == original_height + 1);
+  ValueContext for_value(this);
+  Visit(expr);
 }
 
 
@@ -2244,99 +2301,7 @@ void HGraphBuilder::VisitForControl(Expression* expr,
                                     bool invert_false) {
   TestContext for_test(this, true_block, false_block,
                        invert_true, invert_false);
-  BinaryOperation* binary_op = expr->AsBinaryOperation();
-  UnaryOperation* unary_op = expr->AsUnaryOperation();
-
-  if (unary_op != NULL && unary_op->op() == Token::NOT) {
-    VisitForControl(unary_op->expression(),
-                    false_block,
-                    true_block,
-                    !invert_false,
-                    !invert_true);
-  } else if (binary_op != NULL && binary_op->op() == Token::AND) {
-    // Translate left subexpression.
-    HBasicBlock* eval_right = graph()->CreateBasicBlock();
-    VisitForControl(binary_op->left(),
-                    eval_right,
-                    false_block,
-                    false,
-                    invert_false);
-    if (HasStackOverflow()) return;
-    eval_right->SetJoinId(binary_op->left()->id());
-
-    // Translate right subexpression.
-    eval_right->last_environment()->Pop();
-    subgraph()->set_exit_block(eval_right);
-    VisitForControl(binary_op->right(),
-                    true_block,
-                    false_block,
-                    invert_true,
-                    invert_false);
-  } else if (binary_op != NULL && binary_op->op() == Token::OR) {
-    // Translate left subexpression.
-    HBasicBlock* eval_right = graph()->CreateBasicBlock();
-    VisitForControl(binary_op->left(),
-                    true_block,
-                    eval_right,
-                    invert_true,
-                    false);
-    if (HasStackOverflow()) return;
-    eval_right->SetJoinId(binary_op->left()->id());
-
-    // Translate right subexpression
-    eval_right->last_environment()->Pop();
-    subgraph()->set_exit_block(eval_right);
-    VisitForControl(binary_op->right(),
-                    true_block,
-                    false_block,
-                    invert_true,
-                    invert_false);
-  } else {
-#ifdef DEBUG
-    int original_length = environment()->values()->length();
-#endif
-    // TODO(kmillikin): Refactor to avoid. This code is duplicated from
-    // VisitForValue, except without pushing a value context on the
-    // expression context stack.
-    Visit(expr);
-    if (HasStackOverflow() || !subgraph()->HasExit()) return;
-    HValue* last = subgraph()->exit_block()->GetLastInstruction();
-    if (last != NULL && last->HasSideEffects()) {
-      AddSimulate(expr->id());
-    }
-    ASSERT(environment()->values()->length() == original_length + 1);
-    HValue* value = Pop();
-    HBasicBlock* materialize_true = graph()->CreateBasicBlock();
-    HBasicBlock* materialize_false = graph()->CreateBasicBlock();
-    CurrentBlock()->Finish(new HBranch(materialize_true,
-                                       materialize_false,
-                                       value));
-    HValue* true_value = invert_true
-        ? graph()->GetConstantFalse()
-        : graph()->GetConstantTrue();
-    materialize_true->set_inverted(invert_true);
-    true_block->set_deopt_predecessor(materialize_true);
-
-    if (true_block->IsInlineReturnTarget()) {
-      materialize_true->AddLeaveInlined(true_value, true_block);
-    } else {
-      materialize_true->last_environment()->Push(true_value);
-      materialize_true->Goto(true_block);
-    }
-    HValue* false_value = invert_false
-        ? graph()->GetConstantTrue()
-        : graph()->GetConstantFalse();
-    materialize_false->set_inverted(invert_false);
-    false_block->set_deopt_predecessor(materialize_false);
-
-    if (false_block->IsInlineReturnTarget()) {
-      materialize_false->AddLeaveInlined(false_value, false_block);
-    } else {
-      materialize_false->last_environment()->Push(false_value);
-      materialize_false->Goto(false_block);
-    }
-    subgraph()->set_exit_block(NULL);
-  }
+  Visit(expr);
 }
 
 
@@ -2372,12 +2337,6 @@ void HGraphBuilder::PushAndAdd(HInstruction* instr) {
 }
 
 
-void HGraphBuilder::PushAndAdd(HInstruction* instr, int position) {
-  instr->set_position(position);
-  PushAndAdd(instr);
-}
-
-
 void HGraphBuilder::PushArgumentsForStubCall(int argument_count) {
   const int kMaxStubArguments = 4;
   ASSERT_GE(kMaxStubArguments, argument_count);
@@ -2392,7 +2351,7 @@ void HGraphBuilder::PushArgumentsForStubCall(int argument_count) {
 }
 
 
-void HGraphBuilder::ProcessCall(HCall* call, int source_position) {
+void HGraphBuilder::ProcessCall(HCall* call) {
   for (int i = call->argument_count() - 1; i >= 0; --i) {
     HValue* value = Pop();
     HPushArgument* push = new HPushArgument(value);
@@ -2402,8 +2361,6 @@ void HGraphBuilder::ProcessCall(HCall* call, int source_position) {
   for (int i = 0; i < call->argument_count(); ++i) {
     AddInstruction(call->PushArgumentAt(i));
   }
-
-  PushAndAdd(call, source_position);
 }
 
 
@@ -2914,7 +2871,9 @@ void HGraphBuilder::VisitFunctionLiteral(FunctionLiteral* expr) {
   Handle<SharedFunctionInfo> shared_info =
       Compiler::BuildFunctionInfo(expr, graph_->info()->script());
   CHECK_BAILOUT;
-  PushAndAdd(new HFunctionLiteral(shared_info, expr->pretenure()));
+  HFunctionLiteral* instr =
+      new HFunctionLiteral(shared_info, expr->pretenure());
+  ast_context()->ReturnInstruction(instr, expr->id());
 }
 
 
@@ -2935,20 +2894,21 @@ void HGraphBuilder::VisitConditional(Conditional* expr) {
   ADD_TO_SUBGRAPH(then_graph, expr->then_expression());
   ADD_TO_SUBGRAPH(else_graph, expr->else_expression());
   current_subgraph_->AppendJoin(then_graph, else_graph, expr);
+  ast_context()->ReturnValue(Pop());
 }
 
 
-void HGraphBuilder::LookupGlobalPropertyCell(VariableProxy* expr,
+void HGraphBuilder::LookupGlobalPropertyCell(Variable* var,
                                              LookupResult* lookup,
                                              bool is_store) {
-  if (expr->is_this()) {
+  if (var->is_this()) {
     BAILOUT("global this reference");
   }
   if (!graph()->info()->has_global_object()) {
     BAILOUT("no global object to optimize VariableProxy");
   }
   Handle<GlobalObject> global(graph()->info()->global_object());
-  global->Lookup(*expr->name(), lookup);
+  global->Lookup(*var->name(), lookup);
   if (!lookup->IsProperty()) {
     BAILOUT("global variable cell not yet introduced");
   }
@@ -2961,23 +2921,6 @@ void HGraphBuilder::LookupGlobalPropertyCell(VariableProxy* expr,
 }
 
 
-void HGraphBuilder::HandleGlobalVariableLoad(VariableProxy* expr) {
-  LookupResult lookup;
-  LookupGlobalPropertyCell(expr, &lookup, false);
-  CHECK_BAILOUT;
-
-  Handle<GlobalObject> global(graph()->info()->global_object());
-  // TODO(3039103): Handle global property load through an IC call when access
-  // checks are enabled.
-  if (global->IsAccessCheckNeeded()) {
-    BAILOUT("global object requires access check");
-  }
-  Handle<JSGlobalPropertyCell> cell(global->GetPropertyCell(&lookup));
-  bool check_hole = !lookup.IsDontDelete() || lookup.IsReadOnly();
-  PushAndAdd(new HLoadGlobal(cell, check_hole));
-}
-
-
 void HGraphBuilder::VisitVariableProxy(VariableProxy* expr) {
   Variable* variable = expr->AsVariable();
   if (variable == NULL) {
@@ -2986,9 +2929,22 @@ void HGraphBuilder::VisitVariableProxy(VariableProxy* expr) {
     if (environment()->Lookup(variable)->CheckFlag(HValue::kIsArguments)) {
       BAILOUT("unsupported context for arguments object");
     }
-    Push(environment()->Lookup(variable));
+    ast_context()->ReturnValue(environment()->Lookup(variable));
   } else if (variable->is_global()) {
-    HandleGlobalVariableLoad(expr);
+    LookupResult lookup;
+    LookupGlobalPropertyCell(variable, &lookup, false);
+    CHECK_BAILOUT;
+
+    Handle<GlobalObject> global(graph()->info()->global_object());
+    // TODO(3039103): Handle global property load through an IC call when access
+    // checks are enabled.
+    if (global->IsAccessCheckNeeded()) {
+      BAILOUT("global object requires access check");
+    }
+    Handle<JSGlobalPropertyCell> cell(global->GetPropertyCell(&lookup));
+    bool check_hole = !lookup.IsDontDelete() || lookup.IsReadOnly();
+    HLoadGlobal* instr = new HLoadGlobal(cell, check_hole);
+    ast_context()->ReturnInstruction(instr, expr->id());
   } else {
     BAILOUT("reference to non-stack-allocated/non-global variable");
   }
@@ -2996,14 +2952,16 @@ void HGraphBuilder::VisitVariableProxy(VariableProxy* expr) {
 
 
 void HGraphBuilder::VisitLiteral(Literal* expr) {
-  PushAndAdd(new HConstant(expr->handle(), Representation::Tagged()));
+  HConstant* instr = new HConstant(expr->handle(), Representation::Tagged());
+  ast_context()->ReturnInstruction(instr, expr->id());
 }
 
 
 void HGraphBuilder::VisitRegExpLiteral(RegExpLiteral* expr) {
-  PushAndAdd(new HRegExpLiteral(expr->pattern(),
-                                expr->flags(),
-                                expr->literal_index()));
+  HRegExpLiteral* instr = new HRegExpLiteral(expr->pattern(),
+                                             expr->flags(),
+                                             expr->literal_index());
+  ast_context()->ReturnInstruction(instr, expr->id());
 }
 
 
@@ -3012,6 +2970,8 @@ void HGraphBuilder::VisitObjectLiteral(ObjectLiteral* expr) {
                                                 expr->fast_elements(),
                                                 expr->literal_index(),
                                                 expr->depth()));
+  // The object is expected in the bailout environment during computation
+  // of the property values and is the value of the entire expression.
   PushAndAdd(literal);
 
   expr->CalculateEmitStore();
@@ -3048,6 +3008,7 @@ void HGraphBuilder::VisitObjectLiteral(ObjectLiteral* expr) {
       default: UNREACHABLE();
     }
   }
+  ast_context()->ReturnValue(Pop());
 }
 
 
@@ -3059,6 +3020,8 @@ void HGraphBuilder::VisitArrayLiteral(ArrayLiteral* expr) {
                                              length,
                                              expr->literal_index(),
                                              expr->depth());
+  // The array is expected in the bailout environment during computation
+  // of the property values and is the value of the entire expression.
   PushAndAdd(literal);
   HValue* elements = AddInstruction(new HLoadElements(literal));
 
@@ -3076,6 +3039,7 @@ void HGraphBuilder::VisitArrayLiteral(ArrayLiteral* expr) {
     AddInstruction(new HStoreKeyedFastElement(elements, key, value));
     AddSimulate(expr->GetIdForElement(i));
   }
+  ast_context()->ReturnValue(Pop());
 }
 
 
@@ -3257,27 +3221,29 @@ void HGraphBuilder::HandlePolymorphicStoreNamedField(Assignment* expr,
     Push(value);
     instr->set_position(expr->position());
     AddInstruction(instr);
-    return;
-  }
-
-  // Build subgraph for generic store through IC.
-  {
-    HSubgraph* subgraph = CreateBranchSubgraph(environment());
-    SubgraphScope scope(this, subgraph);
-    if (!needs_generic && FLAG_deoptimize_uncommon_cases) {
-      subgraph->FinishExit(new HDeoptimize());
-    } else {
-      HInstruction* instr = new HStoreNamedGeneric(object, name, value);
-      Push(value);
-      instr->set_position(expr->position());
-      AddInstruction(instr);
+    if (instr->HasSideEffects()) AddSimulate(expr->id());
+  } else {
+    // Build subgraph for generic store through IC.
+    {
+      HSubgraph* subgraph = CreateBranchSubgraph(environment());
+      SubgraphScope scope(this, subgraph);
+      if (!needs_generic && FLAG_deoptimize_uncommon_cases) {
+        subgraph->FinishExit(new HDeoptimize());
+      } else {
+        HInstruction* instr = new HStoreNamedGeneric(object, name, value);
+        Push(value);
+        instr->set_position(expr->position());
+        AddInstruction(instr);
+      }
+      subgraphs.Add(subgraph);
     }
-    subgraphs.Add(subgraph);
+
+    HBasicBlock* new_exit_block =
+        BuildTypeSwitch(&maps, &subgraphs, object, expr->id());
+    subgraph()->set_exit_block(new_exit_block);
   }
 
-  HBasicBlock* new_exit_block =
-      BuildTypeSwitch(&maps, &subgraphs, object, expr->id());
-  current_subgraph_->set_exit_block(new_exit_block);
+  if (subgraph()->HasExit()) ast_context()->ReturnValue(Pop());
 }
 
 
@@ -3333,14 +3299,20 @@ void HGraphBuilder::HandlePropertyAssignment(Assignment* expr) {
   Push(value);
   instr->set_position(expr->position());
   AddInstruction(instr);
+  if (instr->HasSideEffects()) AddSimulate(expr->AssignmentId());
+  ast_context()->ReturnValue(Pop());
 }
 
 
-void HGraphBuilder::HandleGlobalVariableAssignment(VariableProxy* proxy,
+// Because not every expression has a position and there is not common
+// superclass of Assignment and CountOperation, we cannot just pass the
+// owning expression instead of position and ast_id separately.
+void HGraphBuilder::HandleGlobalVariableAssignment(Variable* var,
                                                    HValue* value,
-                                                   int position) {
+                                                   int position,
+                                                   int ast_id) {
   LookupResult lookup;
-  LookupGlobalPropertyCell(proxy, &lookup, true);
+  LookupGlobalPropertyCell(var, &lookup, true);
   CHECK_BAILOUT;
 
   Handle<GlobalObject> global(graph()->info()->global_object());
@@ -3348,6 +3320,7 @@ void HGraphBuilder::HandleGlobalVariableAssignment(VariableProxy* proxy,
   HInstruction* instr = new HStoreGlobal(value, cell);
   instr->set_position(position);
   AddInstruction(instr);
+  if (instr->HasSideEffects()) AddSimulate(ast_id);
 }
 
 
@@ -3371,10 +3344,15 @@ void HGraphBuilder::HandleCompoundAssignment(Assignment* expr) {
     VISIT_FOR_VALUE(operation);
 
     if (var->is_global()) {
-      HandleGlobalVariableAssignment(proxy, Top(), expr->position());
+      HandleGlobalVariableAssignment(var,
+                                     Top(),
+                                     expr->position(),
+                                     expr->AssignmentId());
     } else {
       Bind(var, Top());
     }
+    ast_context()->ReturnValue(Pop());
+
   } else if (prop != NULL) {
     prop->RecordTypeFeedback(oracle());
 
@@ -3392,9 +3370,7 @@ void HGraphBuilder::HandleCompoundAssignment(Assignment* expr) {
         load = BuildLoadNamedGeneric(obj, prop);
       }
       PushAndAdd(load);
-      if (load->HasSideEffects()) {
-        AddSimulate(expr->compound_bailout_id());
-      }
+      if (load->HasSideEffects()) AddSimulate(expr->CompoundLoadId());
 
       VISIT_FOR_VALUE(expr->value());
       HValue* right = Pop();
@@ -3406,10 +3382,11 @@ void HGraphBuilder::HandleCompoundAssignment(Assignment* expr) {
 
       HInstruction* store = BuildStoreNamed(obj, instr, prop);
       AddInstruction(store);
-
-      // Drop the simulated receiver and value and put back the value.
+      // Drop the simulated receiver and value.  Return the value.
       Drop(2);
       Push(instr);
+      if (store->HasSideEffects()) AddSimulate(expr->AssignmentId());
+      ast_context()->ReturnValue(Pop());
 
     } else {
       // Keyed property.
@@ -3425,9 +3402,7 @@ void HGraphBuilder::HandleCompoundAssignment(Assignment* expr) {
           ? BuildLoadKeyedFastElement(obj, key, prop)
           : BuildLoadKeyedGeneric(obj, key);
       PushAndAdd(load);
-      if (load->HasSideEffects()) {
-        AddSimulate(expr->compound_bailout_id());
-      }
+      if (load->HasSideEffects()) AddSimulate(expr->CompoundLoadId());
 
       VISIT_FOR_VALUE(expr->value());
       HValue* right = Pop();
@@ -3441,11 +3416,13 @@ void HGraphBuilder::HandleCompoundAssignment(Assignment* expr) {
           ? BuildStoreKeyedFastElement(obj, key, instr, prop)
           : BuildStoreKeyedGeneric(obj, key, instr);
       AddInstruction(store);
-
-      // Drop the simulated receiver, key and value and put back the value.
+      // Drop the simulated receiver, key, and value.  Return the value.
       Drop(3);
       Push(instr);
+      if (store->HasSideEffects()) AddSimulate(expr->AssignmentId());
+      ast_context()->ReturnValue(Pop());
     }
+
   } else {
     BAILOUT("invalid lhs in compound assignment");
   }
@@ -3465,9 +3442,14 @@ void HGraphBuilder::VisitAssignment(Assignment* expr) {
 
   if (var != NULL) {
     if (proxy->IsArguments()) BAILOUT("assignment to arguments");
+
+    // Handle the assignment.
     if (var->is_global()) {
       VISIT_FOR_VALUE(expr->value());
-      HandleGlobalVariableAssignment(proxy, Top(), expr->position());
+      HandleGlobalVariableAssignment(var,
+                                     Top(),
+                                     expr->position(),
+                                     expr->AssignmentId());
     } else {
       // We allow reference to the arguments object only in assignemtns
       // to local variables to make sure that the arguments object does
@@ -3480,9 +3462,11 @@ void HGraphBuilder::VisitAssignment(Assignment* expr) {
       } else {
         VISIT_FOR_VALUE(expr->value());
       }
-
       Bind(proxy->var(), Top());
     }
+    // Return the value.
+    ast_context()->ReturnValue(Pop());
+
   } else if (prop != NULL) {
     HandlePropertyAssignment(expr);
   } else {
@@ -3492,6 +3476,10 @@ void HGraphBuilder::VisitAssignment(Assignment* expr) {
 
 
 void HGraphBuilder::VisitThrow(Throw* expr) {
+  // We don't optimize functions with invalid left-hand sides in
+  // assignments, count operations, or for-in.  Consequently throw can
+  // currently only occur in an effect context.
+  ASSERT(ast_context()->IsEffect());
   VISIT_FOR_VALUE(expr->exception());
 
   HValue* value = environment()->Pop();
@@ -3525,7 +3513,8 @@ void HGraphBuilder::HandlePolymorphicLoadNamedField(Property* expr,
       SubgraphScope scope(this, subgraph);
       HInstruction* instr =
           BuildLoadNamedField(object, expr, map, &lookup, false);
-      PushAndAdd(instr, expr->position());
+      instr->set_position(expr->position());
+      PushAndAdd(instr);
       subgraphs.Add(subgraph);
     } else {
       needs_generic = true;
@@ -3536,26 +3525,30 @@ void HGraphBuilder::HandlePolymorphicLoadNamedField(Property* expr,
   // generic load.
   if (maps.length() == 0) {
     HInstruction* instr = BuildLoadNamedGeneric(object, expr);
-    PushAndAdd(instr, expr->position());
-    return;
-  }
-
-  // Build subgraph for generic load through IC.
-  {
-    HSubgraph* subgraph = CreateBranchSubgraph(environment());
-    SubgraphScope scope(this, subgraph);
-    if (!needs_generic && FLAG_deoptimize_uncommon_cases) {
-      subgraph->FinishExit(new HDeoptimize());
-    } else {
-      HInstruction* instr = BuildLoadNamedGeneric(object, expr);
-      PushAndAdd(instr, expr->position());
+    instr->set_position(expr->position());
+    PushAndAdd(instr);
+    if (instr->HasSideEffects()) AddSimulate(expr->id());
+  } else {
+    // Build subgraph for generic load through IC.
+    {
+      HSubgraph* subgraph = CreateBranchSubgraph(environment());
+      SubgraphScope scope(this, subgraph);
+      if (!needs_generic && FLAG_deoptimize_uncommon_cases) {
+        subgraph->FinishExit(new HDeoptimize());
+      } else {
+        HInstruction* instr = BuildLoadNamedGeneric(object, expr);
+        instr->set_position(expr->position());
+        PushAndAdd(instr);
+      }
+      subgraphs.Add(subgraph);
     }
-    subgraphs.Add(subgraph);
+
+    HBasicBlock* new_exit_block =
+        BuildTypeSwitch(&maps, &subgraphs, object, expr->id());
+    subgraph()->set_exit_block(new_exit_block);
   }
 
-  HBasicBlock* new_exit_block =
-      BuildTypeSwitch(&maps, &subgraphs, object, expr->id());
-  current_subgraph_->set_exit_block(new_exit_block);
+  if (subgraph()->HasExit()) ast_context()->ReturnValue(Pop());
 }
 
 
@@ -3668,11 +3661,12 @@ bool HGraphBuilder::TryArgumentsAccess(Property* expr) {
     return false;
   }
 
+  HInstruction* result = NULL;
   if (expr->key()->IsPropertyName()) {
     Handle<String> name = expr->key()->AsLiteral()->AsPropertyName();
     if (!name->IsEqualTo(CStrVector("length"))) return false;
     HInstruction* elements = AddInstruction(new HArgumentsElements);
-    PushAndAdd(new HArgumentsLength(elements));
+    result = new HArgumentsLength(elements);
   } else {
     VisitForValue(expr->key());
     if (HasStackOverflow()) return false;
@@ -3680,8 +3674,9 @@ bool HGraphBuilder::TryArgumentsAccess(Property* expr) {
     HInstruction* elements = AddInstruction(new HArgumentsElements);
     HInstruction* length = AddInstruction(new HArgumentsLength(elements));
     AddInstruction(new HBoundsCheck(key, length));
-    PushAndAdd(new HAccessArgumentsAt(elements, length, key));
+    result = new HAccessArgumentsAt(elements, length, key);
   }
+  ast_context()->ReturnInstruction(result, expr->id());
   return true;
 }
 
@@ -3728,7 +3723,8 @@ void HGraphBuilder::VisitProperty(Property* expr) {
         ? BuildLoadKeyedFastElement(obj, key, expr)
         : BuildLoadKeyedGeneric(obj, key);
   }
-  PushAndAdd(instr, expr->position());
+  instr->set_position(expr->position());
+  ast_context()->ReturnInstruction(instr, expr->id());
 }
 
 
@@ -3763,9 +3759,9 @@ void HGraphBuilder::HandlePolymorphicCallNamed(Call* expr,
 
   // Build subgraphs for each of the specific maps.
   //
-  // TODO(ager): We should recognize when the prototype chains for
-  // different maps are identical. In that case we can avoid
-  // repeatedly generating the same prototype map checks.
+  // TODO(ager): We should recognize when the prototype chains for different
+  // maps are identical. In that case we can avoid repeatedly generating the
+  // same prototype map checks.
   for (int i = 0; i < number_of_types; ++i) {
     Handle<Map> map = types->at(i);
     if (expr->ComputeTarget(map, name)) {
@@ -3782,7 +3778,9 @@ void HGraphBuilder::HandlePolymorphicCallNamed(Call* expr,
         // during hydrogen processing.
         CHECK_BAILOUT;
         HCall* call = new HCallConstantFunction(expr->target(), argument_count);
-        ProcessCall(call, expr->position());
+        call->set_position(expr->position());
+        ProcessCall(call);
+        PushAndAdd(call);
       }
       subgraphs.Add(subgraph);
     } else {
@@ -3790,30 +3788,34 @@ void HGraphBuilder::HandlePolymorphicCallNamed(Call* expr,
     }
   }
 
-  // If we couldn't compute the target for any of the maps just
-  // perform an IC call.
+  // If we couldn't compute the target for any of the maps just perform an
+  // IC call.
   if (maps.length() == 0) {
     HCall* call = new HCallNamed(name, argument_count);
-    ProcessCall(call, expr->position());
-    return;
-  }
-
-  // Build subgraph for generic call through IC.
-  {
-    HSubgraph* subgraph = CreateBranchSubgraph(environment());
-    SubgraphScope scope(this, subgraph);
-    if (!needs_generic && FLAG_deoptimize_uncommon_cases) {
-      subgraph->FinishExit(new HDeoptimize());
-    } else {
-      HCall* call = new HCallNamed(name, argument_count);
-      ProcessCall(call, expr->position());
+    call->set_position(expr->position());
+    ProcessCall(call);
+    ast_context()->ReturnInstruction(call, expr->id());
+  } else {
+    // Build subgraph for generic call through IC.
+    {
+      HSubgraph* subgraph = CreateBranchSubgraph(environment());
+      SubgraphScope scope(this, subgraph);
+      if (!needs_generic && FLAG_deoptimize_uncommon_cases) {
+        subgraph->FinishExit(new HDeoptimize());
+      } else {
+        HCall* call = new HCallNamed(name, argument_count);
+        call->set_position(expr->position());
+        ProcessCall(call);
+        PushAndAdd(call);
+      }
+      subgraphs.Add(subgraph);
     }
-    subgraphs.Add(subgraph);
-  }
 
-  HBasicBlock* new_exit_block =
-      BuildTypeSwitch(&maps, &subgraphs, receiver, expr->id());
-  current_subgraph_->set_exit_block(new_exit_block);
+    HBasicBlock* new_exit_block =
+        BuildTypeSwitch(&maps, &subgraphs, receiver, expr->id());
+    subgraph()->set_exit_block(new_exit_block);
+    if (new_exit_block != NULL) ast_context()->ReturnValue(Pop());
+  }
 }
 
 
@@ -4061,6 +4063,7 @@ bool HGraphBuilder::TryInline(Call* expr) {
   function_return_ = saved_function_return;
   oracle_ = saved_oracle;
   graph()->info()->SetOsrAstId(saved_osr_ast_id);
+
   return true;
 }
 
@@ -4086,10 +4089,55 @@ bool HGraphBuilder::TryMathFunctionInline(Call* expr) {
     case kMathSqrt:
       if (argument_count == 2) {
         HValue* argument = Pop();
-        // Pop receiver.
-        Pop();
+        Drop(1);  // Receiver.
         HUnaryMathOperation* op = new HUnaryMathOperation(argument, id);
-        PushAndAdd(op, expr->position());
+        op->set_position(expr->position());
+        ast_context()->ReturnInstruction(op, expr->id());
+        return true;
+      }
+      break;
+    case kMathPow:
+      if (argument_count == 3) {
+        HValue* right = Pop();
+        HValue* left = Pop();
+        Pop();  // Pop receiver.
+        HInstruction* result = NULL;
+        // Use sqrt() if exponent is 0.5 or -0.5.
+        if (right->IsConstant() && HConstant::cast(right)->HasDoubleValue()) {
+          double exponent = HConstant::cast(right)->DoubleValue();
+          if (exponent == 0.5) {
+            result = new HUnaryMathOperation(left, kMathPowHalf);
+            ast_context()->ReturnInstruction(result, expr->id());
+            return true;
+          } else if (exponent == -0.5) {
+            HConstant* double_one =
+                new HConstant(Handle<Object>(Smi::FromInt(1)),
+                              Representation::Double());
+            AddInstruction(double_one);
+            HUnaryMathOperation* square_root =
+                new HUnaryMathOperation(left, kMathPowHalf);
+            AddInstruction(square_root);
+            // MathPowHalf doesn't have side effects so there's no need for
+            // an environment simulation here.
+            ASSERT(!square_root->HasSideEffects());
+            result = new HDiv(double_one, square_root);
+            ast_context()->ReturnInstruction(result, expr->id());
+            return true;
+          } else if (exponent == 2.0) {
+            result = new HMul(left, left);
+            ast_context()->ReturnInstruction(result, expr->id());
+            return true;
+          }
+        } else if (right->IsConstant() &&
+            HConstant::cast(right)->HasInteger32Value() &&
+            HConstant::cast(right)->Integer32Value() == 2) {
+          result = new HMul(left, left);
+          ast_context()->ReturnInstruction(result, expr->id());
+          return true;
+        }
+
+        result = new HPower(left, right);
+        ast_context()->ReturnInstruction(result, expr->id());
         return true;
       }
       break;
@@ -4134,8 +4182,10 @@ bool HGraphBuilder::TryCallApply(Call* expr) {
                            function,
                            expr->GetReceiverTypes()->first(),
                            true);
-  PushAndAdd(new HApplyArguments(function, receiver, length, elements),
-             expr->position());
+  HInstruction* result =
+      new HApplyArguments(function, receiver, length, elements);
+  result->set_position(expr->position());
+  ast_context()->ReturnInstruction(result, expr->id());
   return true;
 }
 
@@ -4163,12 +4213,10 @@ void HGraphBuilder::VisitCall(Call* expr) {
       CHECK_BAILOUT;
 
       call = new HCallKeyed(key, argument_count);
-      ProcessCall(call, expr->position());
-      HValue* result = Pop();
-      // Drop the receiver from the environment and put back the result of
-      // the call.
-      Drop(1);
-      Push(result);
+      call->set_position(expr->position());
+      ProcessCall(call);
+      Drop(1);  // Key.
+      ast_context()->ReturnInstruction(call, expr->id());
       return;
     }
 
@@ -4191,7 +4239,19 @@ void HGraphBuilder::VisitCall(Call* expr) {
     if (expr->IsMonomorphic()) {
       AddCheckConstantFunction(expr, receiver, types->first(), true);
 
-      if (TryMathFunctionInline(expr) || TryInline(expr)) {
+      if (TryMathFunctionInline(expr)) {
+        return;
+      } else if (TryInline(expr)) {
+        if (subgraph()->HasExit()) {
+          HValue* return_value = Pop();
+          // If we inlined a function in a test context then we need to emit
+          // a simulate here to shadow the ones at the end of the
+          // predecessor blocks.  Those environments contain the return
+          // value on top and do not correspond to any actual state of the
+          // unoptimized code.
+          if (ast_context()->IsEffect()) AddSimulate(expr->id());
+          ast_context()->ReturnValue(return_value);
+        }
         return;
       } else {
         // Check for bailout, as the TryInline call in the if condition above
@@ -4199,6 +4259,7 @@ void HGraphBuilder::VisitCall(Call* expr) {
         CHECK_BAILOUT;
         call = new HCallConstantFunction(expr->target(), argument_count);
       }
+
     } else if (types != NULL && types->length() > 1) {
       HandlePolymorphicCallNamed(expr, receiver, types, name);
       return;
@@ -4246,7 +4307,19 @@ void HGraphBuilder::VisitCall(Call* expr) {
                IsGlobalObject());
         environment()->SetExpressionStackAt(receiver_index, global_receiver);
 
-        if (TryInline(expr)) return;
+        if (TryInline(expr)) {
+          if (subgraph()->HasExit()) {
+            HValue* return_value = Pop();
+            // If we inlined a function in a test context then we need to
+            // emit a simulate here to shadow the ones at the end of the
+            // predecessor blocks.  Those environments contain the return
+            // value on top and do not correspond to any actual state of the
+            // unoptimized code.
+            if (ast_context()->IsEffect()) AddSimulate(expr->id());
+            ast_context()->ReturnValue(return_value);
+          }
+          return;
+        }
         // Check for bailout, as trying to inline might fail due to bailout
         // during hydrogen processing.
         CHECK_BAILOUT;
@@ -4269,7 +4342,9 @@ void HGraphBuilder::VisitCall(Call* expr) {
     }
   }
 
-  ProcessCall(call, expr->position());
+  call->set_position(expr->position());
+  ProcessCall(call);
+  ast_context()->ReturnInstruction(call, expr->id());
 }
 
 
@@ -4283,8 +4358,9 @@ void HGraphBuilder::VisitCallNew(CallNew* expr) {
 
   int argument_count = expr->arguments()->length() + 1;  // Plus constructor.
   HCall* call = new HCallNew(argument_count);
-
-  ProcessCall(call, expr->position());
+  call->set_position(expr->position());
+  ProcessCall(call);
+  ast_context()->ReturnInstruction(call, expr->id());
 }
 
 
@@ -4292,7 +4368,7 @@ void HGraphBuilder::VisitCallNew(CallNew* expr) {
 
 // Lookup table for generators for runtime calls that are  generated inline.
 // Elements of the table are member pointers to functions of HGraphBuilder.
-#define INLINE_FUNCTION_GENERATOR_ADDRESS(Name, argc, ressize)          \
+#define INLINE_FUNCTION_GENERATOR_ADDRESS(Name, argc, ressize)  \
     &HGraphBuilder::Generate##Name,
 
 const HGraphBuilder::InlineFunctionGenerator
@@ -4306,7 +4382,7 @@ const HGraphBuilder::InlineFunctionGenerator
 void HGraphBuilder::VisitCallRuntime(CallRuntime* expr) {
   Handle<String> name = expr->name();
   if (name->IsEqualTo(CStrVector("_Log"))) {
-    Push(graph()->GetConstantUndefined());
+    ast_context()->ReturnValue(graph()->GetConstantUndefined());
     return;
   }
 
@@ -4332,11 +4408,13 @@ void HGraphBuilder::VisitCallRuntime(CallRuntime* expr) {
     InlineFunctionGenerator generator = kInlineFunctionGenerators[lookup_index];
 
     // Call the inline code generator using the pointer-to-member.
-    (this->*generator)(argument_count);
+    (this->*generator)(argument_count, expr->id());
   } else {
     ASSERT(function->intrinsic_type == Runtime::RUNTIME);
     HCall* call = new HCallRuntime(name, expr->function(), argument_count);
-    ProcessCall(call, RelocInfo::kNoPosition);
+    call->set_position(RelocInfo::kNoPosition);
+    ProcessCall(call);
+    ast_context()->ReturnInstruction(call, expr->id());
   }
 }
 
@@ -4345,7 +4423,7 @@ void HGraphBuilder::VisitUnaryOperation(UnaryOperation* expr) {
   Token::Value op = expr->op();
   if (op == Token::VOID) {
     VISIT_FOR_EFFECT(expr->expression());
-    Push(graph()->GetConstantUndefined());
+    ast_context()->ReturnValue(graph()->GetConstantUndefined());
   } else if (op == Token::DELETE) {
     Property* prop = expr->expression()->AsProperty();
     Variable* var = expr->expression()->AsVariableProxy()->AsVariable();
@@ -4353,36 +4431,47 @@ void HGraphBuilder::VisitUnaryOperation(UnaryOperation* expr) {
       // Result of deleting non-property, non-variable reference is true.
       // Evaluate the subexpression for side effects.
       VISIT_FOR_EFFECT(expr->expression());
-      Push(graph_->GetConstantTrue());
+      ast_context()->ReturnValue(graph()->GetConstantTrue());
     } else if (var != NULL &&
                !var->is_global() &&
                var->AsSlot() != NULL &&
                var->AsSlot()->type() != Slot::LOOKUP) {
       // Result of deleting non-global, non-dynamic variables is false.
       // The subexpression does not have side effects.
-      Push(graph_->GetConstantFalse());
+      ast_context()->ReturnValue(graph()->GetConstantFalse());
     } else if (prop != NULL) {
       VISIT_FOR_VALUE(prop->obj());
       VISIT_FOR_VALUE(prop->key());
       HValue* key = Pop();
       HValue* obj = Pop();
-      PushAndAdd(new HDeleteProperty(obj, key));
+      ast_context()->ReturnInstruction(new HDeleteProperty(obj, key),
+                                       expr->id());
     } else if (var->is_global()) {
       BAILOUT("delete with global variable");
     } else {
       BAILOUT("delete with non-global variable");
     }
   } else if (op == Token::NOT) {
-    HSubgraph* true_graph = CreateEmptySubgraph();
-    HSubgraph* false_graph = CreateEmptySubgraph();
-    VisitCondition(expr->expression(),
-                   false_graph->entry_block(),
-                   true_graph->entry_block(),
-                   true, true);
-    if (HasStackOverflow()) return;
-    true_graph->environment()->Push(graph_->GetConstantTrue());
-    false_graph->environment()->Push(graph_->GetConstantFalse());
-    current_subgraph_->AppendJoin(true_graph, false_graph, expr);
+    if (ast_context()->IsTest()) {
+      TestContext* context = TestContext::cast(ast_context());
+      VisitForControl(expr->expression(),
+                      context->if_false(),
+                      context->if_true(),
+                      !context->invert_false(),
+                      !context->invert_true());
+    } else {
+      HSubgraph* true_graph = CreateEmptySubgraph();
+      HSubgraph* false_graph = CreateEmptySubgraph();
+      VisitCondition(expr->expression(),
+                     false_graph->entry_block(),
+                     true_graph->entry_block(),
+                     true, true);
+      if (HasStackOverflow()) return;
+      true_graph->environment()->Push(graph_->GetConstantTrue());
+      false_graph->environment()->Push(graph_->GetConstantFalse());
+      current_subgraph_->AppendJoin(true_graph, false_graph, expr);
+      ast_context()->ReturnValue(Pop());
+    }
   } else if (op == Token::BIT_NOT || op == Token::SUB) {
     VISIT_FOR_VALUE(expr->expression());
     HValue* value = Pop();
@@ -4398,11 +4487,11 @@ void HGraphBuilder::VisitUnaryOperation(UnaryOperation* expr) {
         UNREACHABLE();
         break;
     }
-    PushAndAdd(instr);
+    ast_context()->ReturnInstruction(instr, expr->id());
   } else if (op == Token::TYPEOF) {
     VISIT_FOR_VALUE(expr->expression());
     HValue* value = Pop();
-    PushAndAdd(new HTypeof(value));
+    ast_context()->ReturnInstruction(new HTypeof(value), expr->id());
   } else {
     BAILOUT("Value: unsupported unary operation");
   }
@@ -4453,11 +4542,15 @@ void HGraphBuilder::VisitCountOperation(CountOperation* expr) {
     }
 
     if (var->is_global()) {
-      HandleGlobalVariableAssignment(proxy, instr, expr->position());
+      HandleGlobalVariableAssignment(var,
+                                     instr,
+                                     expr->position(),
+                                     expr->AssignmentId());
     } else {
       ASSERT(var->IsStackAllocated());
       Bind(var, instr);
     }
+    ast_context()->ReturnValue(Pop());
 
   } else if (prop != NULL) {
     prop->RecordTypeFeedback(oracle());
@@ -4465,11 +4558,10 @@ void HGraphBuilder::VisitCountOperation(CountOperation* expr) {
     if (prop->key()->IsPropertyName()) {
       // Named property.
 
-      // Match the full code generator stack by simulate an extra stack element
-      // for postfix operations in a value context.
-      if (expr->is_postfix() && !ast_context()->IsEffect()) {
-        Push(graph_->GetConstantUndefined());
-      }
+      // Match the full code generator stack by simulating an extra stack
+      // element for postfix operations in a value context.
+      bool has_extra = expr->is_postfix() && !ast_context()->IsEffect();
+      if (has_extra) Push(graph_->GetConstantUndefined());
 
       VISIT_FOR_VALUE(prop->obj());
       HValue* obj = Top();
@@ -4485,37 +4577,35 @@ void HGraphBuilder::VisitCountOperation(CountOperation* expr) {
       PushAndAdd(load);
       if (load->HasSideEffects()) AddSimulate(increment->id());
 
-      HValue* value = Pop();
-
-      HInstruction* instr = BuildIncrement(value, inc);
-      AddInstruction(instr);
+      HValue* before = Pop();
+      // There is no deoptimization to after the increment, so we don't need
+      // to simulate the expression stack after this instruction.
+      HInstruction* after = BuildIncrement(before, inc);
+      AddInstruction(after);
 
-      HInstruction* store = BuildStoreNamed(obj, instr, prop);
+      HInstruction* store = BuildStoreNamed(obj, after, prop);
       AddInstruction(store);
 
-      // Drop simulated receiver and push the result.
-      // There is no deoptimization to after the increment, so we can simulate
-      // the expression stack here.
-      Drop(1);
-      if (expr->is_prefix()) {
-        Push(instr);
-      } else {
-        if (!ast_context()->IsEffect()) Drop(1);  // Drop simulated zero.
-        Push(value);
-      }
+      // Overwrite the receiver in the bailout environment with the result
+      // of the operation, and the placeholder with the original value if
+      // necessary.
+      environment()->SetExpressionStackAt(0, after);
+      if (has_extra) environment()->SetExpressionStackAt(1, before);
+      if (store->HasSideEffects()) AddSimulate(expr->AssignmentId());
+      Drop(has_extra ? 2 : 1);
+
+      ast_context()->ReturnValue(expr->is_postfix() ? before : after);
 
     } else {
       // Keyed property.
 
       // Match the full code generator stack by simulate an extra stack element
       // for postfix operations in a value context.
-      if (expr->is_postfix() && !ast_context()->IsEffect()) {
-        Push(graph_->GetConstantUndefined());
-      }
+      bool has_extra = expr->is_postfix() && !ast_context()->IsEffect();
+      if (has_extra) Push(graph_->GetConstantUndefined());
 
       VISIT_FOR_VALUE(prop->obj());
       VISIT_FOR_VALUE(prop->key());
-
       HValue* obj = environment()->ExpressionStackAt(1);
       HValue* key = environment()->ExpressionStackAt(0);
 
@@ -4528,27 +4618,29 @@ void HGraphBuilder::VisitCountOperation(CountOperation* expr) {
       PushAndAdd(load);
       if (load->HasSideEffects()) AddSimulate(increment->id());
 
-      HValue* value = Pop();
-
-      HInstruction* instr = BuildIncrement(value, inc);
-      AddInstruction(instr);
+      HValue* before = Pop();
+      // There is no deoptimization to after the increment, so we don't need
+      // to simulate the expression stack after this instruction.
+      HInstruction* after = BuildIncrement(before, inc);
+      AddInstruction(after);
 
       HInstruction* store = is_fast_elements
-          ? BuildStoreKeyedFastElement(obj, key, instr, prop)
-          : new HStoreKeyedGeneric(obj, key, instr);
+          ? BuildStoreKeyedFastElement(obj, key, after, prop)
+          : new HStoreKeyedGeneric(obj, key, after);
       AddInstruction(store);
 
-      // Drop simulated receiver and key and push the result.
-      // There is no deoptimization to after the increment, so we can simulate
-      // the expression stack here.
-      Drop(2);
-      if (expr->is_prefix()) {
-        Push(instr);
-      } else {
-        if (!ast_context()->IsEffect()) Drop(1);  // Drop simulated zero.
-        Push(value);
-      }
+      // Drop the key from the bailout environment.  Overwrite the receiver
+      // with the result of the operation, and the placeholder with the
+      // original value if necessary.
+      Drop(1);
+      environment()->SetExpressionStackAt(0, after);
+      if (has_extra) environment()->SetExpressionStackAt(1, before);
+      if (store->HasSideEffects()) AddSimulate(expr->AssignmentId());
+      Drop(has_extra ? 2 : 1);
+
+      ast_context()->ReturnValue(expr->is_postfix() ? before : after);
     }
+
   } else {
     BAILOUT("invalid lhs in count operation");
   }
@@ -4630,21 +4722,47 @@ static bool IsClassOfTest(CompareOperation* expr) {
 void HGraphBuilder::VisitBinaryOperation(BinaryOperation* expr) {
   if (expr->op() == Token::COMMA) {
     VISIT_FOR_EFFECT(expr->left());
-    VISIT_FOR_VALUE(expr->right());
-  } else if (expr->op() == Token::AND || expr->op() == Token::OR) {
-    VISIT_FOR_VALUE(expr->left());
-    ASSERT(current_subgraph_->HasExit());
+    // Visit the right subexpression in the same AST context as the entire
+    // expression.
+    Visit(expr->right());
 
-    HValue* left = Top();
+  } else if (expr->op() == Token::AND || expr->op() == Token::OR) {
     bool is_logical_and = (expr->op() == Token::AND);
+    if (ast_context()->IsTest()) {
+      TestContext* context = TestContext::cast(ast_context());
+      // Translate left subexpression.
+      HBasicBlock* eval_right = graph()->CreateBasicBlock();
+      if (is_logical_and) {
+        VisitForControl(expr->left(), eval_right, context->if_false(),
+                        false, context->invert_false());
+      } else {
+        VisitForControl(expr->left(), context->if_true(), eval_right,
+                        context->invert_true(), false);
+      }
+      if (HasStackOverflow()) return;
+      eval_right->SetJoinId(expr->left()->id());
+
+      // Translate right subexpression by visiting it in the same AST
+      // context as the entire expression.
+      eval_right->last_environment()->Pop();
+      subgraph()->set_exit_block(eval_right);
+      Visit(expr->right());
+
+    } else {
+      VISIT_FOR_VALUE(expr->left());
+      ASSERT(current_subgraph_->HasExit());
+
+      HValue* left = Top();
+      HEnvironment* environment_copy = environment()->Copy();
+      environment_copy->Pop();
+      HSubgraph* right_subgraph;
+      right_subgraph = CreateBranchSubgraph(environment_copy);
+      ADD_TO_SUBGRAPH(right_subgraph, expr->right());
+      current_subgraph_->AppendOptional(right_subgraph, is_logical_and, left);
+      current_subgraph_->exit_block()->SetJoinId(expr->id());
+      ast_context()->ReturnValue(Pop());
+    }
 
-    HEnvironment* environment_copy = environment()->Copy();
-    environment_copy->Pop();
-    HSubgraph* right_subgraph;
-    right_subgraph = CreateBranchSubgraph(environment_copy);
-    ADD_TO_SUBGRAPH(right_subgraph, expr->right());
-    current_subgraph_->AppendOptional(right_subgraph, is_logical_and, left);
-    current_subgraph_->exit_block()->SetJoinId(expr->id());
   } else {
     VISIT_FOR_VALUE(expr->left());
     VISIT_FOR_VALUE(expr->right());
@@ -4652,7 +4770,8 @@ void HGraphBuilder::VisitBinaryOperation(BinaryOperation* expr) {
     HValue* right = Pop();
     HValue* left = Pop();
     HInstruction* instr = BuildBinaryOperation(expr, left, right);
-    PushAndAdd(instr, expr->position());
+    instr->set_position(expr->position());
+    ast_context()->ReturnInstruction(instr, expr->id());
   }
 }
 
@@ -4691,7 +4810,8 @@ void HGraphBuilder::VisitCompareOperation(CompareOperation* expr) {
     Literal* literal = expr->right()->AsLiteral();
     Handle<String> rhs = Handle<String>::cast(literal->handle());
     HInstruction* instr = new HClassOfTest(value, rhs);
-    PushAndAdd(instr, expr->position());
+    instr->set_position(expr->position());
+    ast_context()->ReturnInstruction(instr, expr->id());
     return;
   }
 
@@ -4705,7 +4825,8 @@ void HGraphBuilder::VisitCompareOperation(CompareOperation* expr) {
     HValue* left = Pop();
     HInstruction* instr = new HTypeofIs(left,
         Handle<String>::cast(right_literal->handle()));
-    PushAndAdd(instr, expr->position());
+    instr->set_position(expr->position());
+    ast_context()->ReturnInstruction(instr, expr->id());
     return;
   }
 
@@ -4741,7 +4862,8 @@ void HGraphBuilder::VisitCompareOperation(CompareOperation* expr) {
     compare->SetInputRepresentation(r);
     instr = compare;
   }
-  PushAndAdd(instr, expr->position());
+  instr->set_position(expr->position());
+  ast_context()->ReturnInstruction(instr, expr->id());
 }
 
 
@@ -4750,8 +4872,7 @@ void HGraphBuilder::VisitCompareToNull(CompareToNull* expr) {
 
   HValue* value = Pop();
   HIsNull* compare = new HIsNull(value, expr->is_strict());
-
-  PushAndAdd(compare);
+  ast_context()->ReturnInstruction(compare, expr->id());
 }
 
 
@@ -4778,301 +4899,305 @@ void HGraphBuilder::VisitDeclaration(Declaration* decl) {
 
 // Generators for inline runtime functions.
 // Support for types.
-void HGraphBuilder::GenerateIsSmi(int argument_count) {
+void HGraphBuilder::GenerateIsSmi(int argument_count, int ast_id) {
   ASSERT(argument_count == 1);
-
   HValue* value = Pop();
-  PushAndAdd(new HIsSmi(value));
+  HIsSmi* result = new HIsSmi(value);
+  ast_context()->ReturnInstruction(result, ast_id);
 }
 
 
-void HGraphBuilder::GenerateIsSpecObject(int argument_count) {
+void HGraphBuilder::GenerateIsSpecObject(int argument_count, int ast_id) {
   ASSERT(argument_count == 1);
-
   HValue* value = Pop();
-  HHasInstanceType* test =
+  HHasInstanceType* result =
       new HHasInstanceType(value, FIRST_JS_OBJECT_TYPE, LAST_TYPE);
-  PushAndAdd(test);
+  ast_context()->ReturnInstruction(result, ast_id);
 }
 
 
-void HGraphBuilder::GenerateIsFunction(int argument_count) {
+void HGraphBuilder::GenerateIsFunction(int argument_count, int ast_id) {
   ASSERT(argument_count == 1);
-
   HValue* value = Pop();
-  HHasInstanceType* test =
-      new HHasInstanceType(value, JS_FUNCTION_TYPE);
-  PushAndAdd(test);
+  HHasInstanceType* result = new HHasInstanceType(value, JS_FUNCTION_TYPE);
+  ast_context()->ReturnInstruction(result, ast_id);
 }
 
 
-void HGraphBuilder::GenerateHasCachedArrayIndex(int argument_count) {
+void HGraphBuilder::GenerateHasCachedArrayIndex(int argument_count,
+                                                int ast_id) {
   ASSERT(argument_count == 1);
-
   HValue* value = Pop();
-  HHasCachedArrayIndex* spec_test = new HHasCachedArrayIndex(value);
-  PushAndAdd(spec_test);
+  HHasCachedArrayIndex* result = new HHasCachedArrayIndex(value);
+  ast_context()->ReturnInstruction(result, ast_id);
 }
 
 
-void HGraphBuilder::GenerateIsArray(int argument_count) {
+void HGraphBuilder::GenerateIsArray(int argument_count, int ast_id) {
   ASSERT(argument_count == 1);
-
   HValue* value = Pop();
-  HHasInstanceType* test =
-      new HHasInstanceType(value, JS_ARRAY_TYPE);
-  PushAndAdd(test);
+  HHasInstanceType* result = new HHasInstanceType(value, JS_ARRAY_TYPE);
+  ast_context()->ReturnInstruction(result, ast_id);
 }
 
 
-void HGraphBuilder::GenerateIsRegExp(int argument_count) {
+void HGraphBuilder::GenerateIsRegExp(int argument_count, int ast_id) {
   ASSERT(argument_count == 1);
-
   HValue* value = Pop();
-  HHasInstanceType* test =
-      new HHasInstanceType(value, JS_REGEXP_TYPE);
-  PushAndAdd(test);
+  HHasInstanceType* result = new HHasInstanceType(value, JS_REGEXP_TYPE);
+  ast_context()->ReturnInstruction(result, ast_id);
 }
 
 
-void HGraphBuilder::GenerateIsNonNegativeSmi(int argument_count) {
+void HGraphBuilder::GenerateIsNonNegativeSmi(int argument_count,
+                                             int ast_id) {
   BAILOUT("inlined runtime function: IsNonNegativeSmi");
 }
 
 
-void HGraphBuilder::GenerateIsObject(int argument_count) {
+void HGraphBuilder::GenerateIsObject(int argument_count, int ast_id) {
   BAILOUT("inlined runtime function: IsObject");
 }
 
 
-void HGraphBuilder::GenerateIsUndetectableObject(int argument_count) {
+void HGraphBuilder::GenerateIsUndetectableObject(int argument_count,
+                                                 int ast_id) {
   BAILOUT("inlined runtime function: IsUndetectableObject");
 }
 
 
 void HGraphBuilder::GenerateIsStringWrapperSafeForDefaultValueOf(
-    int argument_count) {
+    int argument_count,
+    int ast_id) {
   BAILOUT("inlined runtime function: IsStringWrapperSafeForDefaultValueOf");
 }
 
 
   // Support for construct call checks.
-void HGraphBuilder::GenerateIsConstructCall(int argument_count) {
+void HGraphBuilder::GenerateIsConstructCall(int argument_count, int ast_id) {
   BAILOUT("inlined runtime function: IsConstructCall");
 }
 
 
 // Support for arguments.length and arguments[?].
-void HGraphBuilder::GenerateArgumentsLength(int argument_count) {
+void HGraphBuilder::GenerateArgumentsLength(int argument_count, int ast_id) {
   ASSERT(argument_count == 0);
   HInstruction* elements = AddInstruction(new HArgumentsElements);
-  PushAndAdd(new HArgumentsLength(elements));
+  HArgumentsLength* result = new HArgumentsLength(elements);
+  ast_context()->ReturnInstruction(result, ast_id);
 }
 
 
-void HGraphBuilder::GenerateArguments(int argument_count) {
+void HGraphBuilder::GenerateArguments(int argument_count, int ast_id) {
   ASSERT(argument_count == 1);
   HValue* index = Pop();
   HInstruction* elements = AddInstruction(new HArgumentsElements);
   HInstruction* length = AddInstruction(new HArgumentsLength(elements));
-  PushAndAdd(new HAccessArgumentsAt(elements, length, index));
+  HAccessArgumentsAt* result = new HAccessArgumentsAt(elements, length, index);
+  ast_context()->ReturnInstruction(result, ast_id);
 }
 
 
 // Support for accessing the class and value fields of an object.
-void HGraphBuilder::GenerateClassOf(int argument_count) {
+void HGraphBuilder::GenerateClassOf(int argument_count, int ast_id) {
   // The special form detected by IsClassOfTest is detected before we get here
   // and does not cause a bailout.
   BAILOUT("inlined runtime function: ClassOf");
 }
 
 
-void HGraphBuilder::GenerateValueOf(int argument_count) {
+void HGraphBuilder::GenerateValueOf(int argument_count, int ast_id) {
   ASSERT(argument_count == 1);
-
   HValue* value = Pop();
-  HValueOf* op = new HValueOf(value);
-  PushAndAdd(op);
+  HValueOf* result = new HValueOf(value);
+  ast_context()->ReturnInstruction(result, ast_id);
 }
 
 
-void HGraphBuilder::GenerateSetValueOf(int argument_count) {
+void HGraphBuilder::GenerateSetValueOf(int argument_count, int ast_id) {
   BAILOUT("inlined runtime function: SetValueOf");
 }
 
 
 // Fast support for charCodeAt(n).
-void HGraphBuilder::GenerateStringCharCodeAt(int argument_count) {
+void HGraphBuilder::GenerateStringCharCodeAt(int argument_count, int ast_id) {
   BAILOUT("inlined runtime function: StringCharCodeAt");
 }
 
 
 // Fast support for string.charAt(n) and string[n].
-void HGraphBuilder::GenerateStringCharFromCode(int argument_count) {
+void HGraphBuilder::GenerateStringCharFromCode(int argument_count,
+                                               int ast_id) {
   BAILOUT("inlined runtime function: StringCharFromCode");
 }
 
 
 // Fast support for string.charAt(n) and string[n].
-void HGraphBuilder::GenerateStringCharAt(int argument_count) {
+void HGraphBuilder::GenerateStringCharAt(int argument_count, int ast_id) {
   ASSERT_EQ(2, argument_count);
   PushArgumentsForStubCall(argument_count);
-  PushAndAdd(new HCallStub(CodeStub::StringCharAt, argument_count),
-             RelocInfo::kNoPosition);
+  HCallStub* result = new HCallStub(CodeStub::StringCharAt, argument_count);
+  ast_context()->ReturnInstruction(result, ast_id);
 }
 
 
 // Fast support for object equality testing.
-void HGraphBuilder::GenerateObjectEquals(int argument_count) {
+void HGraphBuilder::GenerateObjectEquals(int argument_count, int ast_id) {
   ASSERT(argument_count == 2);
-
   HValue* right = Pop();
   HValue* left = Pop();
-  PushAndAdd(new HCompareJSObjectEq(left, right));
+  HCompareJSObjectEq* result = new HCompareJSObjectEq(left, right);
+  ast_context()->ReturnInstruction(result, ast_id);
 }
 
 
-void HGraphBuilder::GenerateLog(int argument_count) {
+void HGraphBuilder::GenerateLog(int argument_count, int ast_id) {
   UNREACHABLE();  // We caught this in VisitCallRuntime.
 }
 
 
 // Fast support for Math.random().
-void HGraphBuilder::GenerateRandomHeapNumber(int argument_count) {
+void HGraphBuilder::GenerateRandomHeapNumber(int argument_count, int ast_id) {
   BAILOUT("inlined runtime function: RandomHeapNumber");
 }
 
 
 // Fast support for StringAdd.
-void HGraphBuilder::GenerateStringAdd(int argument_count) {
+void HGraphBuilder::GenerateStringAdd(int argument_count, int ast_id) {
   ASSERT_EQ(2, argument_count);
   PushArgumentsForStubCall(argument_count);
-  PushAndAdd(new HCallStub(CodeStub::StringAdd, argument_count),
-             RelocInfo::kNoPosition);
+  HCallStub* result = new HCallStub(CodeStub::StringAdd, argument_count);
+  ast_context()->ReturnInstruction(result, ast_id);
 }
 
 
 // Fast support for SubString.
-void HGraphBuilder::GenerateSubString(int argument_count) {
+void HGraphBuilder::GenerateSubString(int argument_count, int ast_id) {
   ASSERT_EQ(3, argument_count);
   PushArgumentsForStubCall(argument_count);
-  PushAndAdd(new HCallStub(CodeStub::SubString, argument_count),
-             RelocInfo::kNoPosition);
+  HCallStub* result = new HCallStub(CodeStub::SubString, argument_count);
+  ast_context()->ReturnInstruction(result, ast_id);
 }
 
 
 // Fast support for StringCompare.
-void HGraphBuilder::GenerateStringCompare(int argument_count) {
+void HGraphBuilder::GenerateStringCompare(int argument_count, int ast_id) {
   ASSERT_EQ(2, argument_count);
   PushArgumentsForStubCall(argument_count);
-  PushAndAdd(new HCallStub(CodeStub::StringCompare, argument_count),
-             RelocInfo::kNoPosition);
+  HCallStub* result = new HCallStub(CodeStub::StringCompare, argument_count);
+  ast_context()->ReturnInstruction(result, ast_id);
 }
 
 
 // Support for direct calls from JavaScript to native RegExp code.
-void HGraphBuilder::GenerateRegExpExec(int argument_count) {
+void HGraphBuilder::GenerateRegExpExec(int argument_count, int ast_id) {
   ASSERT_EQ(4, argument_count);
   PushArgumentsForStubCall(argument_count);
-  PushAndAdd(new HCallStub(CodeStub::RegExpExec, argument_count),
-             RelocInfo::kNoPosition);
+  HCallStub* result = new HCallStub(CodeStub::RegExpExec, argument_count);
+  ast_context()->ReturnInstruction(result, ast_id);
 }
 
 
 // Construct a RegExp exec result with two in-object properties.
-void HGraphBuilder::GenerateRegExpConstructResult(int argument_count) {
+void HGraphBuilder::GenerateRegExpConstructResult(int argument_count,
+                                                  int ast_id) {
   ASSERT_EQ(3, argument_count);
   PushArgumentsForStubCall(argument_count);
-  PushAndAdd(new HCallStub(CodeStub::RegExpConstructResult, argument_count),
-             RelocInfo::kNoPosition);
+  HCallStub* result =
+      new HCallStub(CodeStub::RegExpConstructResult, argument_count);
+  ast_context()->ReturnInstruction(result, ast_id);
 }
 
 
 // Support for fast native caches.
-void HGraphBuilder::GenerateGetFromCache(int argument_count) {
+void HGraphBuilder::GenerateGetFromCache(int argument_count, int ast_id) {
   BAILOUT("inlined runtime function: GetFromCache");
 }
 
 
 // Fast support for number to string.
-void HGraphBuilder::GenerateNumberToString(int argument_count) {
+void HGraphBuilder::GenerateNumberToString(int argument_count, int ast_id) {
   ASSERT_EQ(1, argument_count);
   PushArgumentsForStubCall(argument_count);
-  PushAndAdd(new HCallStub(CodeStub::NumberToString, argument_count),
-             RelocInfo::kNoPosition);
+  HCallStub* result = new HCallStub(CodeStub::NumberToString, argument_count);
+  ast_context()->ReturnInstruction(result, ast_id);
 }
 
 
 // Fast swapping of elements. Takes three expressions, the object and two
 // indices. This should only be used if the indices are known to be
 // non-negative and within bounds of the elements array at the call site.
-void HGraphBuilder::GenerateSwapElements(int argument_count) {
+void HGraphBuilder::GenerateSwapElements(int argument_count, int ast_id) {
   BAILOUT("inlined runtime function: SwapElements");
 }
 
 
 // Fast call for custom callbacks.
-void HGraphBuilder::GenerateCallFunction(int argument_count) {
+void HGraphBuilder::GenerateCallFunction(int argument_count, int ast_id) {
   BAILOUT("inlined runtime function: CallFunction");
 }
 
 
 // Fast call to math functions.
-void HGraphBuilder::GenerateMathPow(int argument_count) {
+void HGraphBuilder::GenerateMathPow(int argument_count, int ast_id) {
   ASSERT_EQ(2, argument_count);
-  PushArgumentsForStubCall(argument_count);
-  PushAndAdd(new HCallStub(CodeStub::MathPow, argument_count),
-             RelocInfo::kNoPosition);
+  HValue* right = Pop();
+  HValue* left = Pop();
+  HPower* result = new HPower(left, right);
+  ast_context()->ReturnInstruction(result, ast_id);
 }
 
 
-void HGraphBuilder::GenerateMathSin(int argument_count) {
+void HGraphBuilder::GenerateMathSin(int argument_count, int ast_id) {
   ASSERT_EQ(1, argument_count);
   PushArgumentsForStubCall(argument_count);
-  HCallStub* instr =
+  HCallStub* result =
       new HCallStub(CodeStub::TranscendentalCache, argument_count);
-  instr->set_transcendental_type(TranscendentalCache::SIN);
-  PushAndAdd(instr, RelocInfo::kNoPosition);
+  result->set_transcendental_type(TranscendentalCache::SIN);
+  ast_context()->ReturnInstruction(result, ast_id);
 }
 
 
-void HGraphBuilder::GenerateMathCos(int argument_count) {
+void HGraphBuilder::GenerateMathCos(int argument_count, int ast_id) {
   ASSERT_EQ(1, argument_count);
   PushArgumentsForStubCall(argument_count);
-  HCallStub* instr =
+  HCallStub* result =
       new HCallStub(CodeStub::TranscendentalCache, argument_count);
-  instr->set_transcendental_type(TranscendentalCache::COS);
-  PushAndAdd(instr, RelocInfo::kNoPosition);
+  result->set_transcendental_type(TranscendentalCache::COS);
+  ast_context()->ReturnInstruction(result, ast_id);
 }
 
 
-void HGraphBuilder::GenerateMathLog(int argument_count) {
+void HGraphBuilder::GenerateMathLog(int argument_count, int ast_id) {
   ASSERT_EQ(1, argument_count);
   PushArgumentsForStubCall(argument_count);
-  HCallStub* instr =
+  HCallStub* result =
       new HCallStub(CodeStub::TranscendentalCache, argument_count);
-  instr->set_transcendental_type(TranscendentalCache::LOG);
-  PushAndAdd(instr, RelocInfo::kNoPosition);
+  result->set_transcendental_type(TranscendentalCache::LOG);
+  ast_context()->ReturnInstruction(result, ast_id);
 }
 
 
-void HGraphBuilder::GenerateMathSqrt(int argument_count) {
+void HGraphBuilder::GenerateMathSqrt(int argument_count, int ast_id) {
   BAILOUT("inlined runtime function: MathSqrt");
 }
 
 
 // Check whether two RegExps are equivalent
-void HGraphBuilder::GenerateIsRegExpEquivalent(int argument_count) {
+void HGraphBuilder::GenerateIsRegExpEquivalent(int argument_count,
+                                               int ast_id) {
   BAILOUT("inlined runtime function: IsRegExpEquivalent");
 }
 
 
-void HGraphBuilder::GenerateGetCachedArrayIndex(int argument_count) {
+void HGraphBuilder::GenerateGetCachedArrayIndex(int argument_count,
+                                                int ast_id) {
   BAILOUT("inlined runtime function: GetCachedArrayIndex");
 }
 
 
-void HGraphBuilder::GenerateFastAsciiArrayJoin(int argument_count) {
+void HGraphBuilder::GenerateFastAsciiArrayJoin(int argument_count,
+                                               int ast_id) {
   BAILOUT("inlined runtime function: FastAsciiArrayJoin");
 }
 
diff --git a/deps/v8/src/hydrogen.h b/deps/v8/src/hydrogen.h
index 91f3c9e2d6..5611d8da18 100644
--- a/deps/v8/src/hydrogen.h
+++ b/deps/v8/src/hydrogen.h
@@ -557,10 +557,29 @@ class AstContext {
   bool IsValue() const { return kind_ == Expression::kValue; }
   bool IsTest() const { return kind_ == Expression::kTest; }
 
+  // 'Fill' this context with a hydrogen value.  The value is assumed to
+  // have already been inserted in the instruction stream (or not need to
+  // be, e.g., HPhi).  Call this function in tail position in the Visit
+  // functions for expressions.
+  virtual void ReturnValue(HValue* value) = 0;
+
+  // Add a hydrogen instruction to the instruction stream (recording an
+  // environment simulation if necessary) and then fill this context with
+  // the instruction as value.
+  virtual void ReturnInstruction(HInstruction* instr, int ast_id) = 0;
+
  protected:
   AstContext(HGraphBuilder* owner, Expression::Context kind);
   virtual ~AstContext();
 
+  HGraphBuilder* owner() const { return owner_; }
+
+  // We want to be able to assert, in a context-specific way, that the stack
+  // height makes sense when the context is filled.
+#ifdef DEBUG
+  int original_count_;
+#endif
+
  private:
   HGraphBuilder* owner_;
   Expression::Context kind_;
@@ -573,6 +592,10 @@ class EffectContext: public AstContext {
   explicit EffectContext(HGraphBuilder* owner)
       : AstContext(owner, Expression::kEffect) {
   }
+  virtual ~EffectContext();
+
+  virtual void ReturnValue(HValue* value);
+  virtual void ReturnInstruction(HInstruction* instr, int ast_id);
 };
 
 
@@ -581,6 +604,10 @@ class ValueContext: public AstContext {
   explicit ValueContext(HGraphBuilder* owner)
       : AstContext(owner, Expression::kValue) {
   }
+  virtual ~ValueContext();
+
+  virtual void ReturnValue(HValue* value);
+  virtual void ReturnInstruction(HInstruction* instr, int ast_id);
 };
 
 
@@ -598,6 +625,9 @@ class TestContext: public AstContext {
         invert_false_(invert_false) {
   }
 
+  virtual void ReturnValue(HValue* value);
+  virtual void ReturnInstruction(HInstruction* instr, int ast_id);
+
   static TestContext* cast(AstContext* context) {
     ASSERT(context->IsTest());
     return reinterpret_cast<TestContext*>(context);
@@ -610,6 +640,10 @@ class TestContext: public AstContext {
   bool invert_false() { return invert_false_; }
 
  private:
+  // Build the shared core part of the translation unpacking a value into
+  // control flow.
+  void BuildBranch(HValue* value);
+
   HBasicBlock* if_true_;
   HBasicBlock* if_false_;
   bool invert_true_;
@@ -631,9 +665,25 @@ class HGraphBuilder: public AstVisitor {
 
   HGraph* CreateGraph(CompilationInfo* info);
 
+  // Simple accessors.
+  HGraph* graph() const { return graph_; }
+  HSubgraph* subgraph() const { return current_subgraph_; }
+
+  HEnvironment* environment() const { return subgraph()->environment(); }
+  HBasicBlock* CurrentBlock() const { return subgraph()->exit_block(); }
+
+  // Adding instructions.
+  HInstruction* AddInstruction(HInstruction* instr);
+  void AddSimulate(int id);
+
+  // Bailout environment manipulation.
+  void Push(HValue* value) { environment()->Push(value); }
+  HValue* Pop() { return environment()->Pop(); }
+
  private:
   // Type of a member function that generates inline code for a native function.
-  typedef void (HGraphBuilder::*InlineFunctionGenerator)(int argument_count);
+  typedef void (HGraphBuilder::*InlineFunctionGenerator)(int argument_count,
+                                                         int ast_id);
 
   // Forward declarations for inner scope classes.
   class SubgraphScope;
@@ -650,19 +700,14 @@ class HGraphBuilder: public AstVisitor {
 
   // Simple accessors.
   TypeFeedbackOracle* oracle() const { return oracle_; }
-  HGraph* graph() const { return graph_; }
-  HSubgraph* subgraph() const { return current_subgraph_; }
   AstContext* ast_context() const { return ast_context_; }
   void set_ast_context(AstContext* context) { ast_context_ = context; }
   AstContext* call_context() const { return call_context_; }
   HBasicBlock* function_return() const { return function_return_; }
-  HEnvironment* environment() const { return subgraph()->environment(); }
-
-  HBasicBlock* CurrentBlock() const { return subgraph()->exit_block(); }
 
   // Generators for inline runtime functions.
-#define INLINE_FUNCTION_GENERATOR_DECLARATION(Name, argc, ressize)          \
-    void Generate##Name(int argument_count);
+#define INLINE_FUNCTION_GENERATOR_DECLARATION(Name, argc, ressize)      \
+  void Generate##Name(int argument_count, int ast_id);
 
   INLINE_FUNCTION_LIST(INLINE_FUNCTION_GENERATOR_DECLARATION)
   INLINE_RUNTIME_FUNCTION_LIST(INLINE_FUNCTION_GENERATOR_DECLARATION)
@@ -683,8 +728,6 @@ class HGraphBuilder: public AstVisitor {
                               HSubgraph* true_graph,
                               HSubgraph* false_graph);
 
-  void Push(HValue* value) { environment()->Push(value); }
-  HValue* Pop() { return environment()->Pop(); }
   HValue* Top() const { return environment()->Top(); }
   void Drop(int n) { environment()->Drop(n); }
   void Bind(Variable* var, HValue* value) { environment()->Bind(var, value); }
@@ -708,18 +751,15 @@ class HGraphBuilder: public AstVisitor {
   HValue* VisitArgument(Expression* expr);
   void VisitArgumentList(ZoneList<Expression*>* arguments);
 
-  HInstruction* AddInstruction(HInstruction* instr);
-  void AddSimulate(int id);
   void AddPhi(HPhi* phi);
 
   void PushAndAdd(HInstruction* instr);
-  void PushAndAdd(HInstruction* instr, int position);
 
   void PushArgumentsForStubCall(int argument_count);
 
-  // Initialize the arguments to the call based on then environment, add it
-  // to the graph, and drop the arguments from the environment.
-  void ProcessCall(HCall* call, int source_position);
+  // Remove the arguments from the bailout environment and emit instructions
+  // to push them as outgoing parameters.
+  void ProcessCall(HCall* call);
 
   void AssumeRepresentation(HValue* value, Representation r);
   static Representation ToRepresentation(TypeInfo info);
@@ -743,7 +783,7 @@ class HGraphBuilder: public AstVisitor {
                                    FunctionLiteral* function);
 
   // Helpers for flow graph construction.
-  void LookupGlobalPropertyCell(VariableProxy* expr,
+  void LookupGlobalPropertyCell(Variable* var,
                                 LookupResult* lookup,
                                 bool is_store);
 
@@ -753,10 +793,11 @@ class HGraphBuilder: public AstVisitor {
   bool TryMathFunctionInline(Call* expr);
   void TraceInline(Handle<JSFunction> target, bool result);
 
-  void HandleGlobalVariableAssignment(VariableProxy* proxy,
+  void HandleGlobalVariableAssignment(Variable* var,
                                       HValue* value,
-                                      int position);
-  void HandleGlobalVariableLoad(VariableProxy* expr);
+                                      int position,
+                                      int ast_id);
+
   void HandlePropertyAssignment(Assignment* expr);
   void HandleCompoundAssignment(Assignment* expr);
   void HandlePolymorphicLoadNamedField(Property* expr,
diff --git a/deps/v8/src/ia32/builtins-ia32.cc b/deps/v8/src/ia32/builtins-ia32.cc
index c28e144410..918f346d89 100644
--- a/deps/v8/src/ia32/builtins-ia32.cc
+++ b/deps/v8/src/ia32/builtins-ia32.cc
@@ -29,7 +29,6 @@
 
 #if defined(V8_TARGET_ARCH_IA32)
 
-#include "code-stubs.h"
 #include "codegen-inl.h"
 #include "deoptimizer.h"
 #include "full-codegen.h"
diff --git a/deps/v8/src/ia32/full-codegen-ia32.cc b/deps/v8/src/ia32/full-codegen-ia32.cc
index 1f7095f578..e538ee4b9f 100644
--- a/deps/v8/src/ia32/full-codegen-ia32.cc
+++ b/deps/v8/src/ia32/full-codegen-ia32.cc
@@ -911,7 +911,9 @@ void FullCodeGenerator::VisitForInStatement(ForInStatement* stmt) {
   __ bind(&update_each);
   __ mov(result_register(), ebx);
   // Perform the assignment as if via '='.
-  EmitAssignment(stmt->each());
+  { EffectContext context(this);
+    EmitAssignment(stmt->each(), stmt->AssignmentId());
+  }
 
   // Generate code for the body of the loop.
   Visit(stmt->body());
@@ -1478,7 +1480,7 @@ void FullCodeGenerator::VisitAssignment(Assignment* expr) {
     // For property compound assignments we need another deoptimization
     // point after the property load.
     if (property != NULL) {
-      PrepareForBailoutForId(expr->compound_bailout_id(), TOS_REG);
+      PrepareForBailoutForId(expr->CompoundLoadId(), TOS_REG);
     }
 
     Token::Value op = expr->binary_op();
@@ -1521,6 +1523,8 @@ void FullCodeGenerator::VisitAssignment(Assignment* expr) {
     case VARIABLE:
       EmitVariableAssignment(expr->target()->AsVariableProxy()->var(),
                              expr->op());
+      PrepareForBailoutForId(expr->AssignmentId(), TOS_REG);
+      context()->Plug(eax);
       break;
     case NAMED_PROPERTY:
       EmitNamedPropertyAssignment(expr);
@@ -1849,7 +1853,7 @@ void FullCodeGenerator::EmitBinaryOp(Token::Value op,
 }
 
 
-void FullCodeGenerator::EmitAssignment(Expression* expr) {
+void FullCodeGenerator::EmitAssignment(Expression* expr, int bailout_ast_id) {
   // Invalid left-hand sides are rewritten to have a 'throw
   // ReferenceError' on the left-hand side.
   if (!expr->IsValidLeftHandSide()) {
@@ -1897,6 +1901,8 @@ void FullCodeGenerator::EmitAssignment(Expression* expr) {
       break;
     }
   }
+  PrepareForBailoutForId(bailout_ast_id, TOS_REG);
+  context()->Plug(eax);
 }
 
 
@@ -1969,8 +1975,6 @@ void FullCodeGenerator::EmitVariableAssignment(Variable* var,
     }
     __ bind(&done);
   }
-
-  context()->Plug(eax);
 }
 
 
@@ -2007,10 +2011,10 @@ void FullCodeGenerator::EmitNamedPropertyAssignment(Assignment* expr) {
     __ push(Operand(esp, kPointerSize));  // Receiver is under value.
     __ CallRuntime(Runtime::kToFastProperties, 1);
     __ pop(eax);
-    context()->DropAndPlug(1, eax);
-  } else {
-    context()->Plug(eax);
+    __ Drop(1);
   }
+  PrepareForBailoutForId(expr->AssignmentId(), TOS_REG);
+  context()->Plug(eax);
 }
 
 
@@ -2048,6 +2052,7 @@ void FullCodeGenerator::EmitKeyedPropertyAssignment(Assignment* expr) {
     __ pop(eax);
   }
 
+  PrepareForBailoutForId(expr->AssignmentId(), TOS_REG);
   context()->Plug(eax);
 }
 
@@ -3749,6 +3754,8 @@ void FullCodeGenerator::VisitCountOperation(CountOperation* expr) {
         { EffectContext context(this);
           EmitVariableAssignment(expr->expression()->AsVariableProxy()->var(),
                                  Token::ASSIGN);
+          PrepareForBailoutForId(expr->AssignmentId(), TOS_REG);
+          context.Plug(eax);
         }
         // For all contexts except EffectContext We have the result on
         // top of the stack.
@@ -3759,6 +3766,8 @@ void FullCodeGenerator::VisitCountOperation(CountOperation* expr) {
         // Perform the assignment as if via '='.
         EmitVariableAssignment(expr->expression()->AsVariableProxy()->var(),
                                Token::ASSIGN);
+        PrepareForBailoutForId(expr->AssignmentId(), TOS_REG);
+        context()->Plug(eax);
       }
       break;
     case NAMED_PROPERTY: {
@@ -3766,6 +3775,7 @@ void FullCodeGenerator::VisitCountOperation(CountOperation* expr) {
       __ pop(edx);
       Handle<Code> ic(Builtins::builtin(Builtins::StoreIC_Initialize));
       EmitCallIC(ic, RelocInfo::CODE_TARGET);
+      PrepareForBailoutForId(expr->AssignmentId(), TOS_REG);
       if (expr->is_postfix()) {
         if (!context()->IsEffect()) {
           context()->PlugTOS();
@@ -3780,6 +3790,7 @@ void FullCodeGenerator::VisitCountOperation(CountOperation* expr) {
       __ pop(edx);
       Handle<Code> ic(Builtins::builtin(Builtins::KeyedStoreIC_Initialize));
       EmitCallIC(ic, RelocInfo::CODE_TARGET);
+      PrepareForBailoutForId(expr->AssignmentId(), TOS_REG);
       if (expr->is_postfix()) {
         // Result is on the stack
         if (!context()->IsEffect()) {
diff --git a/deps/v8/src/ia32/lithium-codegen-ia32.cc b/deps/v8/src/ia32/lithium-codegen-ia32.cc
index dc0f5e90f9..b5c0289174 100644
--- a/deps/v8/src/ia32/lithium-codegen-ia32.cc
+++ b/deps/v8/src/ia32/lithium-codegen-ia32.cc
@@ -2174,6 +2174,67 @@ void LCodeGen::DoMathSqrt(LUnaryMathOperation* instr) {
 }
 
 
+void LCodeGen::DoMathPowHalf(LUnaryMathOperation* instr) {
+  XMMRegister xmm_scratch = xmm0;
+  XMMRegister input_reg = ToDoubleRegister(instr->input());
+  ASSERT(ToDoubleRegister(instr->result()).is(input_reg));
+  ExternalReference negative_infinity =
+      ExternalReference::address_of_negative_infinity();
+  __ movdbl(xmm_scratch, Operand::StaticVariable(negative_infinity));
+  __ ucomisd(xmm_scratch, input_reg);
+  DeoptimizeIf(equal, instr->environment());
+  __ sqrtsd(input_reg, input_reg);
+}
+
+
+void LCodeGen::DoPower(LPower* instr) {
+  LOperand* left = instr->left();
+  LOperand* right = instr->right();
+  Representation exponent_type = instr->hydrogen()->right()->representation();
+  if (exponent_type.IsDouble()) {
+    // Pass two doubles as arguments on the stack.
+    __ PrepareCallCFunction(4, eax);
+    __ movdbl(Operand(esp, 0 * kDoubleSize), ToDoubleRegister(left));
+    __ movdbl(Operand(esp, 1 * kDoubleSize), ToDoubleRegister(right));
+    __ CallCFunction(ExternalReference::power_double_double_function(), 4);
+  } else if (exponent_type.IsInteger32()) {
+    __ PrepareCallCFunction(4, ebx);
+    __ movdbl(Operand(esp, 0 * kDoubleSize), ToDoubleRegister(left));
+    __ mov(Operand(esp, 1 * kDoubleSize), ToRegister(right));
+    __ CallCFunction(ExternalReference::power_double_int_function(), 4);
+  } else {
+    ASSERT(exponent_type.IsTagged());
+    __ PrepareCallCFunction(4, ebx);
+    __ movdbl(Operand(esp, 0 * kDoubleSize), ToDoubleRegister(left));
+    Register right_reg = ToRegister(right);
+    Label non_smi;
+    Label done;
+    __ test(right_reg, Immediate(kSmiTagMask));
+    __ j(not_zero, &non_smi);
+    __ SmiUntag(right_reg);
+    __ mov(Operand(esp, 1 * kDoubleSize), ToRegister(right));
+    __ CallCFunction(ExternalReference::power_double_int_function(), 4);
+    __ jmp(&done);
+
+    __ bind(&non_smi);
+    __ CmpObjectType(right_reg, HEAP_NUMBER_TYPE , ebx);
+    DeoptimizeIf(not_equal, instr->environment());
+    __ movdbl(xmm1, FieldOperand(right_reg, HeapNumber::kValueOffset));
+    __ movdbl(Operand(esp, 1 * kDoubleSize), xmm1);
+    __ CallCFunction(ExternalReference::power_double_double_function(), 4);
+
+    __ bind(&done);
+  }
+
+  // Return value is in st(0) on ia32.
+  // Store it into the (fixed) result register.
+  __ sub(Operand(esp), Immediate(kDoubleSize));
+  __ fstp_d(Operand(esp, 0));
+  __ movdbl(ToDoubleRegister(instr->result()), Operand(esp, 0));
+  __ add(Operand(esp), Immediate(kDoubleSize));
+}
+
+
 void LCodeGen::DoUnaryMathOperation(LUnaryMathOperation* instr) {
   switch (instr->op()) {
     case kMathAbs:
@@ -2188,6 +2249,9 @@ void LCodeGen::DoUnaryMathOperation(LUnaryMathOperation* instr) {
     case kMathSqrt:
       DoMathSqrt(instr);
       break;
+    case kMathPowHalf:
+      DoMathPowHalf(instr);
+      break;
     default:
       UNREACHABLE();
   }
diff --git a/deps/v8/src/ia32/lithium-codegen-ia32.h b/deps/v8/src/ia32/lithium-codegen-ia32.h
index 91b3fabca3..ca4e9b3fae 100644
--- a/deps/v8/src/ia32/lithium-codegen-ia32.h
+++ b/deps/v8/src/ia32/lithium-codegen-ia32.h
@@ -175,6 +175,7 @@ class LCodeGen BASE_EMBEDDED {
   void DoMathFloor(LUnaryMathOperation* instr);
   void DoMathRound(LUnaryMathOperation* instr);
   void DoMathSqrt(LUnaryMathOperation* instr);
+  void DoMathPowHalf(LUnaryMathOperation* instr);
 
   // Support for recording safepoint and position information.
   void RecordSafepoint(LPointerMap* pointers, int deoptimization_index);
diff --git a/deps/v8/src/ia32/lithium-ia32.cc b/deps/v8/src/ia32/lithium-ia32.cc
index e3a3d7bcb0..1f9714357e 100644
--- a/deps/v8/src/ia32/lithium-ia32.cc
+++ b/deps/v8/src/ia32/lithium-ia32.cc
@@ -460,12 +460,6 @@ int LChunk::NearestGapPos(int index) const {
 }
 
 
-int LChunk::NearestNextGapPos(int index) const {
-  while (!IsGapAt(index)) index++;
-  return index;
-}
-
-
 void LChunk::AddGapMove(int index, LOperand* from, LOperand* to) {
   GetGapAt(index)->GetOrCreateParallelMove(LGap::START)->AddMove(from, to);
 }
@@ -1372,6 +1366,8 @@ LInstruction* LChunkBuilder::DoUnaryMathOperation(HUnaryMathOperation* instr) {
       return AssignEnvironment(DefineAsRegister(result));
     case kMathSqrt:
       return DefineSameAsFirst(result);
+    case kMathPowHalf:
+      return AssignEnvironment(DefineSameAsFirst(result));
     default:
       UNREACHABLE();
       return NULL;
@@ -1572,6 +1568,22 @@ LInstruction* LChunkBuilder::DoAdd(HAdd* instr) {
 }
 
 
+LInstruction* LChunkBuilder::DoPower(HPower* instr) {
+  ASSERT(instr->representation().IsDouble());
+  // We call a C function for double power. It can't trigger a GC.
+  // We need to use fixed result register for the call.
+  Representation exponent_type = instr->right()->representation();
+  ASSERT(instr->left()->representation().IsDouble());
+  LOperand* left = UseFixedDouble(instr->left(), xmm1);
+  LOperand* right = exponent_type.IsDouble() ?
+      UseFixedDouble(instr->right(), xmm2) :
+      UseFixed(instr->right(), eax);
+  LPower* result = new LPower(left, right);
+  return MarkAsCall(DefineFixedDouble(result, xmm1), instr,
+                    CAN_DEOPTIMIZE_EAGERLY);
+}
+
+
 LInstruction* LChunkBuilder::DoCompare(HCompare* instr) {
   Token::Value op = instr->token();
   if (instr->left()->representation().IsInteger32()) {
diff --git a/deps/v8/src/ia32/lithium-ia32.h b/deps/v8/src/ia32/lithium-ia32.h
index af0d5604dd..c97859cfc9 100644
--- a/deps/v8/src/ia32/lithium-ia32.h
+++ b/deps/v8/src/ia32/lithium-ia32.h
@@ -67,6 +67,7 @@ class LGapNode;
 //     LLoadKeyedGeneric
 //     LModI
 //     LMulI
+//     LPower
 //     LShiftI
 //     LSubI
 //   LCallConstantFunction
@@ -229,6 +230,7 @@ class LGapNode;
   V(ObjectLiteral)                              \
   V(OsrEntry)                                   \
   V(Parameter)                                  \
+  V(Power)                                      \
   V(PushArgument)                               \
   V(RegExpLiteral)                              \
   V(Return)                                     \
@@ -1154,6 +1156,16 @@ class LAddI: public LBinaryOperation {
 };
 
 
+class LPower: public LBinaryOperation {
+ public:
+  LPower(LOperand* left, LOperand* right)
+      : LBinaryOperation(left, right) { }
+
+  DECLARE_CONCRETE_INSTRUCTION(Power, "power")
+  DECLARE_HYDROGEN_ACCESSOR(Power)
+};
+
+
 class LArithmeticD: public LBinaryOperation {
  public:
   LArithmeticD(Token::Value op, LOperand* left, LOperand* right)
@@ -1890,7 +1902,6 @@ class LChunk: public ZoneObject {
   LGap* GetGapAt(int index) const;
   bool IsGapAt(int index) const;
   int NearestGapPos(int index) const;
-  int NearestNextGapPos(int index) const;
   void MarkEmptyBlocks();
   const ZoneList<LPointerMap*>* pointer_maps() const { return &pointer_maps_; }
   LLabel* GetLabel(int block_id) const {
diff --git a/deps/v8/src/ia32/macro-assembler-ia32.cc b/deps/v8/src/ia32/macro-assembler-ia32.cc
index 84911ecec5..6c51d6859c 100644
--- a/deps/v8/src/ia32/macro-assembler-ia32.cc
+++ b/deps/v8/src/ia32/macro-assembler-ia32.cc
@@ -1216,25 +1216,29 @@ MaybeObject* MacroAssembler::TryTailCallRuntime(Runtime::FunctionId fid,
 }
 
 
-// If true, a Handle<T> passed by value is passed and returned by
-// using the location_ field directly.  If false, it is passed and
-// returned as a pointer to a handle.
-#ifdef USING_BSD_ABI
-static const bool kPassHandlesDirectly = true;
+// If true, a Handle<T> returned by value from a function with cdecl calling
+// convention will be returned directly as a value of location_ field in a
+// register eax.
+// If false, it is returned as a pointer to a preallocated by caller memory
+// region. Pointer to this region should be passed to a function as an
+// implicit first argument.
+#if defined(USING_BSD_ABI) || defined(__MINGW32__)
+static const bool kReturnHandlesDirectly = true;
 #else
-static const bool kPassHandlesDirectly = false;
+static const bool kReturnHandlesDirectly = false;
 #endif
 
 
 Operand ApiParameterOperand(int index) {
-  return Operand(esp, (index + (kPassHandlesDirectly ? 0 : 1)) * kPointerSize);
+  return Operand(
+      esp, (index + (kReturnHandlesDirectly ? 0 : 1)) * kPointerSize);
 }
 
 
 void MacroAssembler::PrepareCallApiFunction(int argc, Register scratch) {
-  if (kPassHandlesDirectly) {
+  if (kReturnHandlesDirectly) {
     EnterApiExitFrame(argc);
-    // When handles as passed directly we don't have to allocate extra
+    // When handles are returned directly we don't have to allocate extra
     // space for and pass an out parameter.
   } else {
     // We allocate two additional slots: return value and pointer to it.
@@ -1279,7 +1283,7 @@ MaybeObject* MacroAssembler::TryCallApiFunctionAndReturn(ApiFunction* function,
   // Call the api function!
   call(function->address(), RelocInfo::RUNTIME_ENTRY);
 
-  if (!kPassHandlesDirectly) {
+  if (!kReturnHandlesDirectly) {
     // The returned value is a pointer to the handle holding the result.
     // Dereference this to get to the location.
     mov(eax, Operand(eax, 0));
diff --git a/deps/v8/src/json.js b/deps/v8/src/json.js
index e8b732a52a..c0af9d0e46 100644
--- a/deps/v8/src/json.js
+++ b/deps/v8/src/json.js
@@ -66,21 +66,10 @@ function JSONParse(text, reviver) {
   }
 }
 
-function StackContains(stack, val) {
-  var length = stack.length;
-  for (var i = 0; i < length; i++) {
-    if (stack[i] === val) {
-      return true;
-    }
-  }
-  return false;
-}
-
 function SerializeArray(value, replacer, stack, indent, gap) {
-  if (StackContains(stack, value)) {
+  if (!%PushIfAbsent(stack, value)) {
     throw MakeTypeError('circular_structure', []);
   }
-  stack.push(value);
   var stepback = indent;
   indent += gap;
   var partial = [];
@@ -108,10 +97,9 @@ function SerializeArray(value, replacer, stack, indent, gap) {
 }
 
 function SerializeObject(value, replacer, stack, indent, gap) {
-  if (StackContains(stack, value)) {
+  if (!%PushIfAbsent(stack, value)) {
     throw MakeTypeError('circular_structure', []);
   }
-  stack.push(value);
   var stepback = indent;
   indent += gap;
   var partial = [];
@@ -197,10 +185,9 @@ function JSONSerialize(key, holder, replacer, stack, indent, gap) {
 
 
 function BasicSerializeArray(value, stack, builder) {
-  if (StackContains(stack, value)) {
+  if (!%PushIfAbsent(stack, value)) {
     throw MakeTypeError('circular_structure', []);
   }
-  stack.push(value);
   builder.push("[");
   var len = value.length;
   for (var i = 0; i < len; i++) {
@@ -220,10 +207,9 @@ function BasicSerializeArray(value, stack, builder) {
 
 
 function BasicSerializeObject(value, stack, builder) {
-  if (StackContains(stack, value)) {
+  if (!%PushIfAbsent(stack, value)) {
     throw MakeTypeError('circular_structure', []);
   }
-  stack.push(value);
   builder.push("{");
   for (var p in value) {
     if (%HasLocalProperty(value, p)) {
diff --git a/deps/v8/src/lithium-allocator.cc b/deps/v8/src/lithium-allocator.cc
index db0bc8b72d..513a67c7c8 100644
--- a/deps/v8/src/lithium-allocator.cc
+++ b/deps/v8/src/lithium-allocator.cc
@@ -247,7 +247,7 @@ LOperand* LiveRange::CreateAssignedOperand() {
   LOperand* op = NULL;
   if (HasRegisterAssigned()) {
     ASSERT(!IsSpilled());
-    if (assigned_double_) {
+    if (IsDouble()) {
       op = LDoubleRegister::Create(assigned_register());
     } else {
       op = LRegister::Create(assigned_register());
@@ -290,7 +290,7 @@ void LiveRange::AdvanceLastProcessedMarker(
 
 
 void LiveRange::SplitAt(LifetimePosition position, LiveRange* result) {
-  ASSERT(Start().Value() <= position.Value());
+  ASSERT(Start().Value() < position.Value());
   ASSERT(result->IsEmpty());
   // Find the last interval that ends before the position. If the
   // position is contained in one of the intervals in the chain, we
@@ -625,7 +625,7 @@ LiveRange* LAllocator::FixedLiveRangeFor(int index) {
   if (result == NULL) {
     result = new LiveRange(FixedLiveRangeID(index));
     ASSERT(result->IsFixed());
-    result->set_assigned_register(index, false);
+    result->set_assigned_register(index, GENERAL_REGISTERS);
     fixed_live_ranges_[index] = result;
   }
   return result;
@@ -642,7 +642,7 @@ LiveRange* LAllocator::FixedDoubleLiveRangeFor(int index) {
   if (result == NULL) {
     result = new LiveRange(FixedDoubleLiveRangeID(index));
     ASSERT(result->IsFixed());
-    result->set_assigned_register(index, true);
+    result->set_assigned_register(index, DOUBLE_REGISTERS);
     fixed_double_live_ranges_[index] = result;
   }
   return result;
@@ -1258,14 +1258,6 @@ void LAllocator::BuildLiveRanges() {
 }
 
 
-void LAllocator::AllocateGeneralRegisters() {
-  HPhase phase("Allocate general registers", this);
-  num_registers_ = Register::kNumAllocatableRegisters;
-  mode_ = CPU_REGISTERS;
-  AllocateRegisters();
-}
-
-
 bool LAllocator::SafePointsAreInOrder() const {
   const ZoneList<LPointerMap*>* pointer_maps = chunk_->pointer_maps();
   int safe_point = 0;
@@ -1397,10 +1389,18 @@ void LAllocator::ProcessOsrEntry() {
 }
 
 
+void LAllocator::AllocateGeneralRegisters() {
+  HPhase phase("Allocate general registers", this);
+  num_registers_ = Register::kNumAllocatableRegisters;
+  mode_ = GENERAL_REGISTERS;
+  AllocateRegisters();
+}
+
+
 void LAllocator::AllocateDoubleRegisters() {
   HPhase phase("Allocate double registers", this);
   num_registers_ = DoubleRegister::kNumAllocatableRegisters;
-  mode_ = XMM_REGISTERS;
+  mode_ = DOUBLE_REGISTERS;
   AllocateRegisters();
 }
 
@@ -1411,7 +1411,7 @@ void LAllocator::AllocateRegisters() {
 
   for (int i = 0; i < live_ranges_.length(); ++i) {
     if (live_ranges_[i] != NULL) {
-      if (HasDoubleValue(live_ranges_[i]->id()) == (mode_ == XMM_REGISTERS)) {
+      if (RequiredRegisterKind(live_ranges_[i]->id()) == mode_) {
         AddToUnhandledUnsorted(live_ranges_[i]);
       }
     }
@@ -1422,7 +1422,7 @@ void LAllocator::AllocateRegisters() {
   ASSERT(active_live_ranges_.is_empty());
   ASSERT(inactive_live_ranges_.is_empty());
 
-  if (mode_ == XMM_REGISTERS) {
+  if (mode_ == DOUBLE_REGISTERS) {
     for (int i = 0; i < fixed_double_live_ranges_.length(); ++i) {
       LiveRange* current = fixed_double_live_ranges_.at(i);
       if (current != NULL) {
@@ -1463,11 +1463,7 @@ void LAllocator::AllocateRegisters() {
                  current->Start().NextInstruction().Value()) {
         // Do not spill live range eagerly if use position that can benefit from
         // the register is too close to the start of live range.
-        LiveRange* part = Split(current,
-                                current->Start().NextInstruction(),
-                                pos->pos());
-        Spill(current);
-        AddToUnhandledSorted(part);
+        SpillBetween(current, current->Start(), pos->pos());
         ASSERT(UnhandledIsSorted());
         continue;
       }
@@ -1521,6 +1517,16 @@ void LAllocator::Setup() {
 }
 
 
+const char* LAllocator::RegisterName(int allocation_index) {
+  ASSERT(mode_ != NONE);
+  if (mode_ == GENERAL_REGISTERS) {
+    return Register::AllocationIndexToString(allocation_index);
+  } else {
+    return DoubleRegister::AllocationIndexToString(allocation_index);
+  }
+}
+
+
 void LAllocator::TraceAlloc(const char* msg, ...) {
   if (FLAG_trace_alloc) {
     va_list arguments;
@@ -1544,10 +1550,12 @@ bool LAllocator::HasTaggedValue(int virtual_register) const {
 }
 
 
-bool LAllocator::HasDoubleValue(int virtual_register) const {
+RegisterKind LAllocator::RequiredRegisterKind(int virtual_register) const {
   HValue* value = graph()->LookupValue(virtual_register);
-  if (value == NULL) return false;
-  return value->representation().IsDouble();
+  if (value != NULL && value->representation().IsDouble()) {
+    return DOUBLE_REGISTERS;
+  }
+  return GENERAL_REGISTERS;
 }
 
 
@@ -1728,16 +1736,22 @@ void LAllocator::InactiveToActive(LiveRange* range) {
 }
 
 
+// TryAllocateFreeReg and AllocateBlockedReg assume this
+// when allocating local arrays.
+STATIC_ASSERT(DoubleRegister::kNumAllocatableRegisters >=
+              Register::kNumAllocatableRegisters);
+
+
 bool LAllocator::TryAllocateFreeReg(LiveRange* current) {
-  LifetimePosition max_pos = LifetimePosition::FromInstructionIndex(
-      chunk_->instructions()->length() + 1);
-  ASSERT(DoubleRegister::kNumAllocatableRegisters >=
-         Register::kNumAllocatableRegisters);
-  EmbeddedVector<LifetimePosition, DoubleRegister::kNumAllocatableRegisters>
-      free_pos(max_pos);
+  LifetimePosition free_until_pos[DoubleRegister::kNumAllocatableRegisters];
+
+  for (int i = 0; i < DoubleRegister::kNumAllocatableRegisters; i++) {
+    free_until_pos[i] = LifetimePosition::MaxPosition();
+  }
+
   for (int i = 0; i < active_live_ranges_.length(); ++i) {
     LiveRange* cur_active = active_live_ranges_.at(i);
-    free_pos[cur_active->assigned_register()] =
+    free_until_pos[cur_active->assigned_register()] =
         LifetimePosition::FromInstructionIndex(0);
   }
 
@@ -1748,67 +1762,83 @@ bool LAllocator::TryAllocateFreeReg(LiveRange* current) {
         cur_inactive->FirstIntersection(current);
     if (!next_intersection.IsValid()) continue;
     int cur_reg = cur_inactive->assigned_register();
-    free_pos[cur_reg] = Min(free_pos[cur_reg], next_intersection);
+    free_until_pos[cur_reg] = Min(free_until_pos[cur_reg], next_intersection);
   }
 
-  UsePosition* pos = current->FirstPosWithHint();
-  if (pos != NULL) {
-    LOperand* hint = pos->hint();
+  UsePosition* hinted_use = current->FirstPosWithHint();
+  if (hinted_use != NULL) {
+    LOperand* hint = hinted_use->hint();
     if (hint->IsRegister() || hint->IsDoubleRegister()) {
       int register_index = hint->index();
-      TraceAlloc("Found reg hint %d for live range %d (free [%d, end %d[)\n",
-                 register_index,
-                 current->id(),
-                 free_pos[register_index].Value(),
-                 current->End().Value());
-      if (free_pos[register_index].Value() >= current->End().Value()) {
-        TraceAlloc("Assigning preferred reg %d to live range %d\n",
-                   register_index,
+      TraceAlloc(
+          "Found reg hint %s (free until [%d) for live range %d (end %d[).\n",
+          RegisterName(register_index),
+          free_until_pos[register_index].Value(),
+          current->id(),
+          current->End().Value());
+
+      // The desired register is free until the end of the current live range.
+      if (free_until_pos[register_index].Value() >= current->End().Value()) {
+        TraceAlloc("Assigning preferred reg %s to live range %d\n",
+                   RegisterName(register_index),
                    current->id());
-        current->set_assigned_register(register_index, mode_ == XMM_REGISTERS);
+        current->set_assigned_register(register_index, mode_);
         return true;
       }
     }
   }
 
-  int max_reg = 0;
+  // Find the register which stays free for the longest time.
+  int reg = 0;
   for (int i = 1; i < RegisterCount(); ++i) {
-    if (free_pos[i].Value() > free_pos[max_reg].Value()) {
-      max_reg = i;
+    if (free_until_pos[i].Value() > free_until_pos[reg].Value()) {
+      reg = i;
     }
   }
 
-  if (free_pos[max_reg].InstructionIndex() == 0) {
+  LifetimePosition pos = free_until_pos[reg];
+
+  if (pos.Value() <= current->Start().Value()) {
+    // All registers are blocked.
     return false;
-  } else if (free_pos[max_reg].Value() >= current->End().Value()) {
-    TraceAlloc("Assigning reg %d to live range %d\n", max_reg, current->id());
-    current->set_assigned_register(max_reg, mode_ == XMM_REGISTERS);
-  } else {
-    // Split the interval at the nearest gap and never split an interval at its
-    // start position.
-    LifetimePosition pos =
-        LifetimePosition::FromInstructionIndex(
-            chunk_->NearestGapPos(free_pos[max_reg].InstructionIndex()));
-    if (pos.Value() <= current->Start().Value()) return false;
-    LiveRange* second_range = Split(current, pos);
-    AddToUnhandledSorted(second_range);
-    current->set_assigned_register(max_reg, mode_ == XMM_REGISTERS);
   }
 
+  if (pos.Value() < current->End().Value()) {
+    // Register reg is available at the range start but becomes blocked before
+    // the range end. Split current at position where it becomes blocked.
+    LiveRange* tail = SplitAt(current, pos);
+    AddToUnhandledSorted(tail);
+  }
+
+
+  // Register reg is available at the range start and is free until
+  // the range end.
+  ASSERT(pos.Value() >= current->End().Value());
+  TraceAlloc("Assigning reg %s to live range %d\n",
+             RegisterName(reg),
+             current->id());
+  current->set_assigned_register(reg, mode_);
+
   return true;
 }
 
 
 void LAllocator::AllocateBlockedReg(LiveRange* current) {
-  LifetimePosition max_pos =
-      LifetimePosition::FromInstructionIndex(
-          chunk_->instructions()->length() + 1);
-  ASSERT(DoubleRegister::kNumAllocatableRegisters >=
-         Register::kNumAllocatableRegisters);
-  EmbeddedVector<LifetimePosition, DoubleRegister::kNumAllocatableRegisters>
-      use_pos(max_pos);
-  EmbeddedVector<LifetimePosition, DoubleRegister::kNumAllocatableRegisters>
-      block_pos(max_pos);
+  UsePosition* register_use = current->NextRegisterPosition(current->Start());
+  if (register_use == NULL) {
+    // There is no use in the current live range that requires a register.
+    // We can just spill it.
+    Spill(current);
+    return;
+  }
+
+
+  LifetimePosition use_pos[DoubleRegister::kNumAllocatableRegisters];
+  LifetimePosition block_pos[DoubleRegister::kNumAllocatableRegisters];
+
+  for (int i = 0; i < DoubleRegister::kNumAllocatableRegisters; i++) {
+    use_pos[i] = block_pos[i] = LifetimePosition::MaxPosition();
+  }
 
   for (int i = 0; i < active_live_ranges_.length(); ++i) {
     LiveRange* range = active_live_ranges_[i];
@@ -1841,47 +1871,63 @@ void LAllocator::AllocateBlockedReg(LiveRange* current) {
     }
   }
 
-  int max_reg = 0;
+  int reg = 0;
   for (int i = 1; i < RegisterCount(); ++i) {
-    if (use_pos[i].Value() > use_pos[max_reg].Value()) {
-      max_reg = i;
+    if (use_pos[i].Value() > use_pos[reg].Value()) {
+      reg = i;
     }
   }
 
-  UsePosition* first_usage = current->NextRegisterPosition(current->Start());
-  if (first_usage == NULL) {
-    Spill(current);
-  } else if (use_pos[max_reg].Value() < first_usage->pos().Value()) {
-    SplitAndSpill(current, current->Start(), first_usage->pos());
-  } else {
-    if (block_pos[max_reg].Value() < current->End().Value()) {
-      // Split current before blocked position.
-      LiveRange* second_range = Split(current,
-                                      current->Start(),
-                                      block_pos[max_reg]);
-      AddToUnhandledSorted(second_range);
-    }
+  LifetimePosition pos = use_pos[reg];
+
+  if (pos.Value() < register_use->pos().Value()) {
+    // All registers are blocked before the first use that requires a register.
+    // Spill starting part of live range up to that use.
+    //
+    // Corner case: the first use position is equal to the start of the range.
+    // In this case we have nothing to spill and SpillBetween will just return
+    // this range to the list of unhandled ones. This will lead to the infinite
+    // loop.
+    ASSERT(current->Start().Value() < register_use->pos().Value());
+    SpillBetween(current, current->Start(), register_use->pos());
+    return;
+  }
 
-    current->set_assigned_register(max_reg, mode_ == XMM_REGISTERS);
-    SplitAndSpillIntersecting(current);
+  if (block_pos[reg].Value() < current->End().Value()) {
+    // Register becomes blocked before the current range end. Split before that
+    // position.
+    LiveRange* tail = SplitBetween(current,
+                                   current->Start(),
+                                   block_pos[reg].InstructionStart());
+    AddToUnhandledSorted(tail);
   }
+
+  // Register reg is not blocked for the whole range.
+  ASSERT(block_pos[reg].Value() >= current->End().Value());
+  TraceAlloc("Assigning reg %s to live range %d\n",
+             RegisterName(reg),
+             current->id());
+  current->set_assigned_register(reg, mode_);
+
+  // This register was not free. Thus we need to find and spill
+  // parts of active and inactive live regions that use the same register
+  // at the same lifetime positions as current.
+  SplitAndSpillIntersecting(current);
 }
 
 
 void LAllocator::SplitAndSpillIntersecting(LiveRange* current) {
   ASSERT(current->HasRegisterAssigned());
   int reg = current->assigned_register();
-  LifetimePosition split_pos =
-      LifetimePosition::FromInstructionIndex(
-          chunk_->NearestGapPos(current->Start().InstructionIndex()));
+  LifetimePosition split_pos = current->Start();
   for (int i = 0; i < active_live_ranges_.length(); ++i) {
     LiveRange* range = active_live_ranges_[i];
     if (range->assigned_register() == reg) {
       UsePosition* next_pos = range->NextRegisterPosition(current->Start());
       if (next_pos == NULL) {
-        SplitAndSpill(range, split_pos);
+        SpillAfter(range, split_pos);
       } else {
-        SplitAndSpill(range, split_pos, next_pos->pos());
+        SpillBetween(range, split_pos, next_pos->pos());
       }
       ActiveToHandled(range);
       --i;
@@ -1896,10 +1942,10 @@ void LAllocator::SplitAndSpillIntersecting(LiveRange* current) {
       if (next_intersection.IsValid()) {
         UsePosition* next_pos = range->NextRegisterPosition(current->Start());
         if (next_pos == NULL) {
-          SplitAndSpill(range, split_pos);
+          SpillAfter(range, split_pos);
         } else {
           next_intersection = Min(next_intersection, next_pos->pos());
-          SplitAndSpill(range, split_pos, next_intersection);
+          SpillBetween(range, split_pos, next_intersection);
         }
         InactiveToHandled(range);
         --i;
@@ -1909,19 +1955,50 @@ void LAllocator::SplitAndSpillIntersecting(LiveRange* current) {
 }
 
 
-LiveRange* LAllocator::Split(LiveRange* range,
-                             LifetimePosition start,
-                             LifetimePosition end) {
+bool LAllocator::IsBlockBoundary(LifetimePosition pos) {
+  return pos.IsInstructionStart() &&
+      chunk_->instructions()->at(pos.InstructionIndex())->IsLabel();
+}
+
+
+void LAllocator::AddGapMove(int pos, LiveRange* prev, LiveRange* next) {
+  UsePosition* prev_pos = prev->AddUsePosition(
+      LifetimePosition::FromInstructionIndex(pos));
+  UsePosition* next_pos = next->AddUsePosition(
+      LifetimePosition::FromInstructionIndex(pos));
+  LOperand* prev_operand = prev_pos->operand();
+  LOperand* next_operand = next_pos->operand();
+  LGap* gap = chunk_->GetGapAt(pos);
+  gap->GetOrCreateParallelMove(LGap::START)->
+      AddMove(prev_operand, next_operand);
+  next_pos->set_hint(prev_operand);
+}
+
+
+LiveRange* LAllocator::SplitAt(LiveRange* range, LifetimePosition pos) {
+  ASSERT(!range->IsFixed());
+  TraceAlloc("Splitting live range %d at %d\n", range->id(), pos.Value());
+
+  if (pos.Value() <= range->Start().Value()) return range;
+
+  LiveRange* result = LiveRangeFor(next_virtual_register_++);
+  range->SplitAt(pos, result);
+  return result;
+}
+
+
+LiveRange* LAllocator::SplitBetween(LiveRange* range,
+                                    LifetimePosition start,
+                                    LifetimePosition end) {
   ASSERT(!range->IsFixed());
-  TraceAlloc("Splitting live range %d in position between [%d, %d[\n",
+  TraceAlloc("Splitting live range %d in position between [%d, %d]\n",
              range->id(),
              start.Value(),
              end.Value());
 
-  LifetimePosition split_pos = FindOptimalSplitPos(
-      start, end.PrevInstruction().InstructionEnd());
+  LifetimePosition split_pos = FindOptimalSplitPos(start, end);
   ASSERT(split_pos.Value() >= start.Value());
-  return Split(range, split_pos);
+  return SplitAt(range, split_pos);
 }
 
 
@@ -1944,81 +2021,52 @@ LifetimePosition LAllocator::FindOptimalSplitPos(LifetimePosition start,
   }
 
   HBasicBlock* block = end_block;
-  // Move to the most outside loop header.
+  // Find header of outermost loop.
   while (block->parent_loop_header() != NULL &&
       block->parent_loop_header()->block_id() > start_block->block_id()) {
     block = block->parent_loop_header();
   }
 
-  if (block == end_block) {
-    return end;
-  }
+  if (block == end_block) return end;
 
   return LifetimePosition::FromInstructionIndex(
       block->first_instruction_index());
 }
 
 
-bool LAllocator::IsBlockBoundary(LifetimePosition pos) {
-  return pos.IsInstructionStart() &&
-      chunk_->instructions()->at(pos.InstructionIndex())->IsLabel();
+void LAllocator::SpillAfter(LiveRange* range, LifetimePosition pos) {
+  LiveRange* second_part = SplitAt(range, pos);
+  Spill(second_part);
 }
 
 
-void LAllocator::AddGapMove(int pos, LiveRange* prev, LiveRange* next) {
-  UsePosition* prev_pos = prev->AddUsePosition(
-      LifetimePosition::FromInstructionIndex(pos));
-  UsePosition* next_pos = next->AddUsePosition(
-      LifetimePosition::FromInstructionIndex(pos));
-  LOperand* prev_operand = prev_pos->operand();
-  LOperand* next_operand = next_pos->operand();
-  LGap* gap = chunk_->GetGapAt(pos);
-  gap->GetOrCreateParallelMove(LGap::START)->
-      AddMove(prev_operand, next_operand);
-  next_pos->set_hint(prev_operand);
-}
-
+void LAllocator::SpillBetween(LiveRange* range,
+                              LifetimePosition start,
+                              LifetimePosition end) {
+  ASSERT(start.Value() < end.Value());
+  LiveRange* second_part = SplitAt(range, start);
 
-LiveRange* LAllocator::Split(LiveRange* range, LifetimePosition pos) {
-  ASSERT(!range->IsFixed());
-  TraceAlloc("Splitting live range %d at %d\n", range->id(), pos.Value());
-  if (pos.Value() <= range->Start().Value()) {
-    return range;
-  }
-  LiveRange* result = LiveRangeFor(next_virtual_register_++);
-  range->SplitAt(pos, result);
-  return result;
-}
+  if (second_part->Start().Value() < end.Value()) {
+    // The split result intersects with [start, end[.
+    // Split it at position between ]start+1, end[, spill the middle part
+    // and put the rest to unhandled.
+    LiveRange* third_part = SplitBetween(
+        second_part,
+        second_part->Start().InstructionEnd(),
+        end.PrevInstruction().InstructionEnd());
 
+    ASSERT(third_part != second_part);
 
-void LAllocator::SplitAndSpill(LiveRange* range,
-                               LifetimePosition start,
-                               LifetimePosition end) {
-  // We have an interval range and want to make sure that it is
-  // spilled at start and at most spilled until end.
-  ASSERT(start.Value() < end.Value());
-  LiveRange* tail_part = Split(range, start);
-  if (tail_part->Start().Value() < end.Value()) {
-    LiveRange* third_part = Split(tail_part,
-                                  tail_part->Start().NextInstruction(),
-                                  end);
-    Spill(tail_part);
-    ASSERT(third_part != tail_part);
+    Spill(second_part);
     AddToUnhandledSorted(third_part);
   } else {
-    AddToUnhandledSorted(tail_part);
+    // The split result does not intersect with [start, end[.
+    // Nothing to spill. Just put it to unhandled as whole.
+    AddToUnhandledSorted(second_part);
   }
 }
 
 
-void LAllocator::SplitAndSpill(LiveRange* range, LifetimePosition at) {
-  at = LifetimePosition::FromInstructionIndex(
-      chunk_->NearestGapPos(at.InstructionIndex()));
-  LiveRange* second_part = Split(range, at);
-  Spill(second_part);
-}
-
-
 void LAllocator::Spill(LiveRange* range) {
   ASSERT(!range->IsSpilled());
   TraceAlloc("Spilling live range %d\n", range->id());
@@ -2026,7 +2074,7 @@ void LAllocator::Spill(LiveRange* range) {
 
   if (!first->HasAllocatedSpillOperand()) {
     LOperand* op = TryReuseSpillSlot(range);
-    if (op == NULL) op = chunk_->GetNextSpillSlot(mode_ == XMM_REGISTERS);
+    if (op == NULL) op = chunk_->GetNextSpillSlot(mode_ == DOUBLE_REGISTERS);
     first->SetSpillOperand(op);
   }
   range->MakeSpilled();
diff --git a/deps/v8/src/lithium-allocator.h b/deps/v8/src/lithium-allocator.h
index 52fee6455f..3ec984e262 100644
--- a/deps/v8/src/lithium-allocator.h
+++ b/deps/v8/src/lithium-allocator.h
@@ -55,6 +55,7 @@ class LPointerMap;
 class LStackSlot;
 class LRegister;
 
+
 // This class represents a single point of a LOperand's lifetime.
 // For each lithium instruction there are exactly two lifetime positions:
 // the beginning and the end of the instruction. Lifetime positions for
@@ -121,7 +122,13 @@ class LifetimePosition {
   // instruction.
   bool IsValid() const { return value_ != -1; }
 
-  static LifetimePosition Invalid() { return LifetimePosition(); }
+  static inline LifetimePosition Invalid() { return LifetimePosition(); }
+
+  static inline LifetimePosition MaxPosition() {
+    // We have to use this kind of getter instead of static member due to
+    // crash bug in GDB.
+    return LifetimePosition(kMaxInt);
+  }
 
  private:
   static const int kStep = 2;
@@ -135,6 +142,13 @@ class LifetimePosition {
 };
 
 
+enum RegisterKind {
+  NONE,
+  GENERAL_REGISTERS,
+  DOUBLE_REGISTERS
+};
+
+
 class LOperand: public ZoneObject {
  public:
   enum Kind {
@@ -594,8 +608,8 @@ class LiveRange: public ZoneObject {
   explicit LiveRange(int id)
       : id_(id),
         spilled_(false),
-        assigned_double_(false),
         assigned_register_(kInvalidAssignment),
+        assigned_register_kind_(NONE),
         last_interval_(NULL),
         first_interval_(NULL),
         first_pos_(NULL),
@@ -620,10 +634,10 @@ class LiveRange: public ZoneObject {
   LOperand* CreateAssignedOperand();
   int assigned_register() const { return assigned_register_; }
   int spill_start_index() const { return spill_start_index_; }
-  void set_assigned_register(int reg, bool double_reg) {
+  void set_assigned_register(int reg, RegisterKind register_kind) {
     ASSERT(!HasRegisterAssigned() && !IsSpilled());
     assigned_register_ = reg;
-    assigned_double_ = double_reg;
+    assigned_register_kind_ = register_kind;
     ConvertOperands();
   }
   void MakeSpilled() {
@@ -652,9 +666,13 @@ class LiveRange: public ZoneObject {
   // Can this live range be spilled at this position.
   bool CanBeSpilled(LifetimePosition pos);
 
+  // Split this live range at the given position which must follow the start of
+  // the range.
+  // All uses following the given position will be moved from this
+  // live range to the result live range.
   void SplitAt(LifetimePosition position, LiveRange* result);
 
-  bool IsDouble() const { return assigned_double_; }
+  bool IsDouble() const { return assigned_register_kind_ == DOUBLE_REGISTERS; }
   bool HasRegisterAssigned() const {
     return assigned_register_ != kInvalidAssignment;
   }
@@ -721,8 +739,8 @@ class LiveRange: public ZoneObject {
 
   int id_;
   bool spilled_;
-  bool assigned_double_;
   int assigned_register_;
+  RegisterKind assigned_register_kind_;
   UseInterval* last_interval_;
   UseInterval* first_interval_;
   UsePosition* first_pos_;
@@ -774,8 +792,8 @@ class LAllocator BASE_EMBEDDED {
   // Checks whether the value of a given virtual register is tagged.
   bool HasTaggedValue(int virtual_register) const;
 
-  // Checks whether the value of a given virtual register is a double.
-  bool HasDoubleValue(int virtual_register) const;
+  // Returns the register kind required by the given virtual register.
+  RegisterKind RequiredRegisterKind(int virtual_register) const;
 
   // Begin a new instruction.
   void BeginInstruction();
@@ -814,12 +832,6 @@ class LAllocator BASE_EMBEDDED {
 #endif
 
  private:
-  enum OperationMode {
-    NONE,
-    CPU_REGISTERS,
-    XMM_REGISTERS
-  };
-
   void MeetRegisterConstraints();
   void ResolvePhis();
   void BuildLiveRanges();
@@ -871,17 +883,38 @@ class LAllocator BASE_EMBEDDED {
   // Helper methods for allocating registers.
   bool TryAllocateFreeReg(LiveRange* range);
   void AllocateBlockedReg(LiveRange* range);
-  void SplitAndSpillIntersecting(LiveRange* range);
+
+  // Live range splitting helpers.
+
+  // Split the given range at the given position.
+  // If range starts at or after the given position then the
+  // original range is returned.
+  // Otherwise returns the live range that starts at pos and contains
+  // all uses from the original range that follow pos. Uses at pos will
+  // still be owned by the original range after splitting.
+  LiveRange* SplitAt(LiveRange* range, LifetimePosition pos);
+
+  // Split the given range in a position from the interval [start, end].
+  LiveRange* SplitBetween(LiveRange* range,
+                          LifetimePosition start,
+                          LifetimePosition end);
+
+  // Find a lifetime position in the interval [start, end] which
+  // is optimal for splitting: it is either header of the outermost
+  // loop covered by this interval or the latest possible position.
   LifetimePosition FindOptimalSplitPos(LifetimePosition start,
                                        LifetimePosition end);
-  LiveRange* Split(LiveRange* range,
-                   LifetimePosition start,
-                   LifetimePosition end);
-  LiveRange* Split(LiveRange* range, LifetimePosition split_pos);
-  void SplitAndSpill(LiveRange* range,
-                     LifetimePosition start,
-                     LifetimePosition end);
-  void SplitAndSpill(LiveRange* range, LifetimePosition at);
+
+  // Spill the given life range after position pos.
+  void SpillAfter(LiveRange* range, LifetimePosition pos);
+
+  // Spill the given life range after position start and up to position end.
+  void SpillBetween(LiveRange* range,
+                    LifetimePosition start,
+                    LifetimePosition end);
+
+  void SplitAndSpillIntersecting(LiveRange* range);
+
   void Spill(LiveRange* range);
   bool IsBlockBoundary(LifetimePosition pos);
   void AddGapMove(int pos, LiveRange* prev, LiveRange* next);
@@ -914,6 +947,8 @@ class LAllocator BASE_EMBEDDED {
   HPhi* LookupPhi(LOperand* operand) const;
   LGap* GetLastGap(HBasicBlock* block) const;
 
+  const char* RegisterName(int allocation_index);
+
   LChunk* chunk_;
   ZoneList<InstructionSummary*> summaries_;
   InstructionSummary* next_summary_;
@@ -938,7 +973,7 @@ class LAllocator BASE_EMBEDDED {
   // Next virtual register number to be assigned to temporaries.
   int next_virtual_register_;
 
-  OperationMode mode_;
+  RegisterKind mode_;
   int num_registers_;
 
   HGraph* graph_;
diff --git a/deps/v8/src/log-utils.cc b/deps/v8/src/log-utils.cc
index d6d8754b23..c7b75679ea 100644
--- a/deps/v8/src/log-utils.cc
+++ b/deps/v8/src/log-utils.cc
@@ -273,29 +273,7 @@ void LogMessageBuilder::Append(String* str) {
 
 
 void LogMessageBuilder::AppendAddress(Address addr) {
-  static Address last_address_ = NULL;
-  AppendAddress(addr, last_address_);
-  last_address_ = addr;
-}
-
-
-void LogMessageBuilder::AppendAddress(Address addr, Address bias) {
-  if (!FLAG_compress_log) {
-    Append("0x%" V8PRIxPTR, addr);
-  } else if (bias == NULL) {
-    Append("%" V8PRIxPTR, addr);
-  } else {
-    uintptr_t delta;
-    char sign;
-    if (addr >= bias) {
-      delta = addr - bias;
-      sign = '+';
-    } else {
-      delta = bias - addr;
-      sign = '-';
-    }
-    Append("%c%" V8PRIxPTR, sign, delta);
-  }
+  Append("0x%" V8PRIxPTR, addr);
 }
 
 
@@ -343,24 +321,6 @@ void LogMessageBuilder::AppendStringPart(const char* str, int len) {
 }
 
 
-bool LogMessageBuilder::StoreInCompressor(LogRecordCompressor* compressor) {
-  return compressor->Store(Vector<const char>(Log::message_buffer_, pos_));
-}
-
-
-bool LogMessageBuilder::RetrieveCompressedPrevious(
-    LogRecordCompressor* compressor, const char* prefix) {
-  pos_ = 0;
-  if (prefix[0] != '\0') Append(prefix);
-  Vector<char> prev_record(Log::message_buffer_ + pos_,
-                           Log::kMessageBufferSize - pos_);
-  const bool has_prev = compressor->RetrievePreviousCompressed(&prev_record);
-  if (!has_prev) return false;
-  pos_ += prev_record.length();
-  return true;
-}
-
-
 void LogMessageBuilder::WriteToLogFile() {
   ASSERT(pos_ <= Log::kMessageBufferSize);
   const int written = Log::Write(Log::message_buffer_, pos_);
@@ -369,145 +329,6 @@ void LogMessageBuilder::WriteToLogFile() {
   }
 }
 
-
-// Formatting string for back references to the whole line. E.g. "#2" means
-// "the second line above".
-const char* LogRecordCompressor::kLineBackwardReferenceFormat = "#%d";
-
-// Formatting string for back references. E.g. "#2:10" means
-// "the second line above, start from char 10 (0-based)".
-const char* LogRecordCompressor::kBackwardReferenceFormat = "#%d:%d";
-
-
-LogRecordCompressor::~LogRecordCompressor() {
-  for (int i = 0; i < buffer_.length(); ++i) {
-    buffer_[i].Dispose();
-  }
-}
-
-
-static int GetNumberLength(int number) {
-  ASSERT(number >= 0);
-  ASSERT(number < 10000);
-  if (number < 10) return 1;
-  if (number < 100) return 2;
-  if (number < 1000) return 3;
-  return 4;
-}
-
-
-int LogRecordCompressor::GetBackwardReferenceSize(int distance, int pos) {
-  // See kLineBackwardReferenceFormat and kBackwardReferenceFormat.
-  return pos == 0 ? GetNumberLength(distance) + 1
-      : GetNumberLength(distance) + GetNumberLength(pos) + 2;
-}
-
-
-void LogRecordCompressor::PrintBackwardReference(Vector<char> dest,
-                                                 int distance,
-                                                 int pos) {
-  if (pos == 0) {
-    OS::SNPrintF(dest, kLineBackwardReferenceFormat, distance);
-  } else {
-    OS::SNPrintF(dest, kBackwardReferenceFormat, distance, pos);
-  }
-}
-
-
-bool LogRecordCompressor::Store(const Vector<const char>& record) {
-  // Check if the record is the same as the last stored one.
-  if (curr_ != -1) {
-    Vector<const char>& curr = buffer_[curr_];
-    if (record.length() == curr.length()
-        && strncmp(record.start(), curr.start(), record.length()) == 0) {
-      return false;
-    }
-  }
-  // buffer_ is circular.
-  prev_ = curr_++;
-  curr_ %= buffer_.length();
-  Vector<char> record_copy = Vector<char>::New(record.length());
-  memcpy(record_copy.start(), record.start(), record.length());
-  buffer_[curr_].Dispose();
-  buffer_[curr_] =
-      Vector<const char>(record_copy.start(), record_copy.length());
-  return true;
-}
-
-
-bool LogRecordCompressor::RetrievePreviousCompressed(
-    Vector<char>* prev_record) {
-  if (prev_ == -1) return false;
-
-  int index = prev_;
-  // Distance from prev_.
-  int distance = 0;
-  // Best compression result among records in the buffer.
-  struct {
-    intptr_t truncated_len;
-    int distance;
-    int copy_from_pos;
-    int backref_size;
-  } best = {-1, 0, 0, 0};
-  Vector<const char>& prev = buffer_[prev_];
-  const char* const prev_start = prev.start();
-  const char* const prev_end = prev.start() + prev.length();
-  do {
-    // We're moving backwards until we reach the current record.
-    // Remember that buffer_ is circular.
-    if (--index == -1) index = buffer_.length() - 1;
-    ++distance;
-    if (index == curr_) break;
-
-    Vector<const char>& data = buffer_[index];
-    if (data.start() == NULL) break;
-    const char* const data_end = data.start() + data.length();
-    const char* prev_ptr = prev_end;
-    const char* data_ptr = data_end;
-    // Compare strings backwards, stop on the last matching character.
-    while (prev_ptr != prev_start && data_ptr != data.start()
-          && *(prev_ptr - 1) == *(data_ptr - 1)) {
-      --prev_ptr;
-      --data_ptr;
-    }
-    const intptr_t truncated_len = prev_end - prev_ptr;
-    const int copy_from_pos = static_cast<int>(data_ptr - data.start());
-    // Check if the length of compressed tail is enough.
-    if (truncated_len <= kMaxBackwardReferenceSize
-        && truncated_len <= GetBackwardReferenceSize(distance, copy_from_pos)) {
-      continue;
-    }
-
-    // Record compression results.
-    if (truncated_len > best.truncated_len) {
-      best.truncated_len = truncated_len;
-      best.distance = distance;
-      best.copy_from_pos = copy_from_pos;
-      best.backref_size = GetBackwardReferenceSize(distance, copy_from_pos);
-    }
-  } while (true);
-
-  if (best.distance == 0) {
-    // Can't compress the previous record. Return as is.
-    ASSERT(prev_record->length() >= prev.length());
-    memcpy(prev_record->start(), prev.start(), prev.length());
-    prev_record->Truncate(prev.length());
-  } else {
-    // Copy the uncompressible part unchanged.
-    const intptr_t unchanged_len = prev.length() - best.truncated_len;
-    // + 1 for '\0'.
-    ASSERT(prev_record->length() >= unchanged_len + best.backref_size + 1);
-    memcpy(prev_record->start(), prev.start(), unchanged_len);
-    // Append the backward reference.
-    Vector<char> backref(
-        prev_record->start() + unchanged_len, best.backref_size + 1);
-    PrintBackwardReference(backref, best.distance, best.copy_from_pos);
-    ASSERT(strlen(backref.start()) - best.backref_size == 0);
-    prev_record->Truncate(static_cast<int>(unchanged_len + best.backref_size));
-  }
-  return true;
-}
-
 #endif  // ENABLE_LOGGING_AND_PROFILING
 
 } }  // namespace v8::internal
diff --git a/deps/v8/src/log-utils.h b/deps/v8/src/log-utils.h
index ffea9282cb..719d37030e 100644
--- a/deps/v8/src/log-utils.h
+++ b/deps/v8/src/log-utils.h
@@ -176,50 +176,6 @@ class Log : public AllStatic {
 
   friend class Logger;
   friend class LogMessageBuilder;
-  friend class LogRecordCompressor;
-};
-
-
-// An utility class for performing backward reference compression
-// of string ends. It operates using a window of previous strings.
-class LogRecordCompressor {
- public:
-  // 'window_size' is the size of backward lookup window.
-  explicit LogRecordCompressor(int window_size)
-      : buffer_(window_size + kNoCompressionWindowSize),
-        kMaxBackwardReferenceSize(
-            GetBackwardReferenceSize(window_size, Log::kMessageBufferSize)),
-        curr_(-1), prev_(-1) {
-  }
-
-  ~LogRecordCompressor();
-
-  // Fills vector with a compressed version of the previous record.
-  // Returns false if there is no previous record.
-  bool RetrievePreviousCompressed(Vector<char>* prev_record);
-
-  // Stores a record if it differs from a previous one (or there's no previous).
-  // Returns true, if the record has been stored.
-  bool Store(const Vector<const char>& record);
-
- private:
-  // The minimum size of a buffer: a place needed for the current and
-  // the previous record. Since there is no place for precedessors of a previous
-  // record, it can't be compressed at all.
-  static const int kNoCompressionWindowSize = 2;
-
-  // Formatting strings for back references.
-  static const char* kLineBackwardReferenceFormat;
-  static const char* kBackwardReferenceFormat;
-
-  static int GetBackwardReferenceSize(int distance, int pos);
-
-  static void PrintBackwardReference(Vector<char> dest, int distance, int pos);
-
-  ScopedVector< Vector<const char> > buffer_;
-  const int kMaxBackwardReferenceSize;
-  int curr_;
-  int prev_;
 };
 
 
@@ -244,32 +200,14 @@ class LogMessageBuilder BASE_EMBEDDED {
   // Append a heap string.
   void Append(String* str);
 
-  // Appends an address, compressing it if needed by offsetting
-  // from Logger::last_address_.
+  // Appends an address.
   void AppendAddress(Address addr);
 
-  // Appends an address, compressing it if needed.
-  void AppendAddress(Address addr, Address bias);
-
   void AppendDetailed(String* str, bool show_impl_info);
 
   // Append a portion of a string.
   void AppendStringPart(const char* str, int len);
 
-  // Stores log message into compressor, returns true if the message
-  // was stored (i.e. doesn't repeat the previous one).
-  bool StoreInCompressor(LogRecordCompressor* compressor);
-
-  // Sets log message to a previous version of compressed message.
-  // Returns false, if there is no previous message.
-  bool RetrieveCompressedPrevious(LogRecordCompressor* compressor) {
-    return RetrieveCompressedPrevious(compressor, "");
-  }
-
-  // Does the same at the version without arguments, and sets a prefix.
-  bool RetrieveCompressedPrevious(LogRecordCompressor* compressor,
-                                  const char* prefix);
-
   // Write the log message to the log file currently opened.
   void WriteToLogFile();
 
diff --git a/deps/v8/src/log.cc b/deps/v8/src/log.cc
index 6723347924..b8e3f05a47 100644
--- a/deps/v8/src/log.cc
+++ b/deps/v8/src/log.cc
@@ -303,7 +303,6 @@ void Profiler::Engage() {
   Logger::ticker_->SetProfiler(this);
 
   Logger::ProfilerBeginEvent();
-  Logger::LogAliases();
 }
 
 
@@ -343,43 +342,21 @@ void Profiler::Run() {
 Ticker* Logger::ticker_ = NULL;
 Profiler* Logger::profiler_ = NULL;
 SlidingStateWindow* Logger::sliding_state_window_ = NULL;
-const char** Logger::log_events_ = NULL;
-CompressionHelper* Logger::compression_helper_ = NULL;
 int Logger::logging_nesting_ = 0;
 int Logger::cpu_profiler_nesting_ = 0;
 int Logger::heap_profiler_nesting_ = 0;
 
-#define DECLARE_LONG_EVENT(ignore1, long_name, ignore2) long_name,
-const char* kLongLogEventsNames[Logger::NUMBER_OF_LOG_EVENTS] = {
-  LOG_EVENTS_AND_TAGS_LIST(DECLARE_LONG_EVENT)
+#define DECLARE_EVENT(ignore1, name) name,
+const char* kLogEventsNames[Logger::NUMBER_OF_LOG_EVENTS] = {
+  LOG_EVENTS_AND_TAGS_LIST(DECLARE_EVENT)
 };
-#undef DECLARE_LONG_EVENT
-
-#define DECLARE_SHORT_EVENT(ignore1, ignore2, short_name) short_name,
-const char* kCompressedLogEventsNames[Logger::NUMBER_OF_LOG_EVENTS] = {
-  LOG_EVENTS_AND_TAGS_LIST(DECLARE_SHORT_EVENT)
-};
-#undef DECLARE_SHORT_EVENT
+#undef DECLARE_EVENT
 
 
 void Logger::ProfilerBeginEvent() {
   if (!Log::IsEnabled()) return;
   LogMessageBuilder msg;
   msg.Append("profiler,\"begin\",%d\n", kSamplingIntervalMs);
-  if (FLAG_compress_log) {
-    msg.Append("profiler,\"compression\",%d\n", kCompressionWindowSize);
-  }
-  msg.WriteToLogFile();
-}
-
-
-void Logger::LogAliases() {
-  if (!Log::IsEnabled() || !FLAG_compress_log) return;
-  LogMessageBuilder msg;
-  for (int i = 0; i < NUMBER_OF_LOG_EVENTS; ++i) {
-    msg.Append("alias,%s,%s\n",
-               kCompressedLogEventsNames[i], kLongLogEventsNames[i]);
-  }
   msg.WriteToLogFile();
 }
 
@@ -686,55 +663,16 @@ void Logger::DeleteEvent(const char* name, void* object) {
 }
 
 
-#ifdef ENABLE_LOGGING_AND_PROFILING
-
-// A class that contains all common code dealing with record compression.
-class CompressionHelper {
- public:
-  explicit CompressionHelper(int window_size)
-      : compressor_(window_size), repeat_count_(0) { }
-
-  // Handles storing message in compressor, retrieving the previous one and
-  // prefixing it with repeat count, if needed.
-  // Returns true if message needs to be written to log.
-  bool HandleMessage(LogMessageBuilder* msg) {
-    if (!msg->StoreInCompressor(&compressor_)) {
-      // Current message repeats the previous one, don't write it.
-      ++repeat_count_;
-      return false;
-    }
-    if (repeat_count_ == 0) {
-      return msg->RetrieveCompressedPrevious(&compressor_);
-    }
-    OS::SNPrintF(prefix_, "%s,%d,",
-                 Logger::log_events_[Logger::REPEAT_META_EVENT],
-                 repeat_count_ + 1);
-    repeat_count_ = 0;
-    return msg->RetrieveCompressedPrevious(&compressor_, prefix_.start());
-  }
-
- private:
-  LogRecordCompressor compressor_;
-  int repeat_count_;
-  EmbeddedVector<char, 20> prefix_;
-};
-
-#endif  // ENABLE_LOGGING_AND_PROFILING
-
-
 #ifdef ENABLE_LOGGING_AND_PROFILING
 void Logger::CallbackEventInternal(const char* prefix, const char* name,
                                    Address entry_point) {
   if (!Log::IsEnabled() || !FLAG_log_code) return;
   LogMessageBuilder msg;
   msg.Append("%s,%s,",
-             log_events_[CODE_CREATION_EVENT], log_events_[CALLBACK_TAG]);
+             kLogEventsNames[CODE_CREATION_EVENT],
+             kLogEventsNames[CALLBACK_TAG]);
   msg.AppendAddress(entry_point);
   msg.Append(",1,\"%s%s\"", prefix, name);
-  if (FLAG_compress_log) {
-    ASSERT(compression_helper_ != NULL);
-    if (!compression_helper_->HandleMessage(&msg)) return;
-  }
   msg.Append('\n');
   msg.WriteToLogFile();
 }
@@ -786,7 +724,9 @@ void Logger::CodeCreateEvent(LogEventsAndTags tag,
 #ifdef ENABLE_LOGGING_AND_PROFILING
   if (!Log::IsEnabled() || !FLAG_log_code) return;
   LogMessageBuilder msg;
-  msg.Append("%s,%s,", log_events_[CODE_CREATION_EVENT], log_events_[tag]);
+  msg.Append("%s,%s,",
+             kLogEventsNames[CODE_CREATION_EVENT],
+             kLogEventsNames[tag]);
   msg.AppendAddress(code->address());
   msg.Append(",%d,\"%s", code->ExecutableSize(), ComputeMarker(code));
   for (const char* p = comment; *p != '\0'; p++) {
@@ -797,10 +737,6 @@ void Logger::CodeCreateEvent(LogEventsAndTags tag,
   }
   msg.Append('"');
   LowLevelCodeCreateEvent(code, &msg);
-  if (FLAG_compress_log) {
-    ASSERT(compression_helper_ != NULL);
-    if (!compression_helper_->HandleMessage(&msg)) return;
-  }
   msg.Append('\n');
   msg.WriteToLogFile();
 #endif
@@ -813,14 +749,12 @@ void Logger::CodeCreateEvent(LogEventsAndTags tag, Code* code, String* name) {
   LogMessageBuilder msg;
   SmartPointer<char> str =
       name->ToCString(DISALLOW_NULLS, ROBUST_STRING_TRAVERSAL);
-  msg.Append("%s,%s,", log_events_[CODE_CREATION_EVENT], log_events_[tag]);
+  msg.Append("%s,%s,",
+             kLogEventsNames[CODE_CREATION_EVENT],
+             kLogEventsNames[tag]);
   msg.AppendAddress(code->address());
   msg.Append(",%d,\"%s%s\"", code->ExecutableSize(), ComputeMarker(code), *str);
   LowLevelCodeCreateEvent(code, &msg);
-  if (FLAG_compress_log) {
-    ASSERT(compression_helper_ != NULL);
-    if (!compression_helper_->HandleMessage(&msg)) return;
-  }
   msg.Append('\n');
   msg.WriteToLogFile();
 #endif
@@ -837,7 +771,9 @@ void Logger::CodeCreateEvent(LogEventsAndTags tag,
       name->ToCString(DISALLOW_NULLS, ROBUST_STRING_TRAVERSAL);
   SmartPointer<char> sourcestr =
       source->ToCString(DISALLOW_NULLS, ROBUST_STRING_TRAVERSAL);
-  msg.Append("%s,%s,", log_events_[CODE_CREATION_EVENT], log_events_[tag]);
+  msg.Append("%s,%s,",
+             kLogEventsNames[CODE_CREATION_EVENT],
+             kLogEventsNames[tag]);
   msg.AppendAddress(code->address());
   msg.Append(",%d,\"%s%s %s:%d\"",
              code->ExecutableSize(),
@@ -846,10 +782,6 @@ void Logger::CodeCreateEvent(LogEventsAndTags tag,
              *sourcestr,
              line);
   LowLevelCodeCreateEvent(code, &msg);
-  if (FLAG_compress_log) {
-    ASSERT(compression_helper_ != NULL);
-    if (!compression_helper_->HandleMessage(&msg)) return;
-  }
   msg.Append('\n');
   msg.WriteToLogFile();
 #endif
@@ -860,14 +792,12 @@ void Logger::CodeCreateEvent(LogEventsAndTags tag, Code* code, int args_count) {
 #ifdef ENABLE_LOGGING_AND_PROFILING
   if (!Log::IsEnabled() || !FLAG_log_code) return;
   LogMessageBuilder msg;
-  msg.Append("%s,%s,", log_events_[CODE_CREATION_EVENT], log_events_[tag]);
+  msg.Append("%s,%s,",
+             kLogEventsNames[CODE_CREATION_EVENT],
+             kLogEventsNames[tag]);
   msg.AppendAddress(code->address());
   msg.Append(",%d,\"args_count: %d\"", code->ExecutableSize(), args_count);
   LowLevelCodeCreateEvent(code, &msg);
-  if (FLAG_compress_log) {
-    ASSERT(compression_helper_ != NULL);
-    if (!compression_helper_->HandleMessage(&msg)) return;
-  }
   msg.Append('\n');
   msg.WriteToLogFile();
 #endif
@@ -878,7 +808,7 @@ void Logger::CodeMovingGCEvent() {
 #ifdef ENABLE_LOGGING_AND_PROFILING
   if (!Log::IsEnabled() || !FLAG_log_code || !FLAG_ll_prof) return;
   LogMessageBuilder msg;
-  msg.Append("%s\n", log_events_[CODE_MOVING_GC]);
+  msg.Append("%s\n", kLogEventsNames[CODE_MOVING_GC]);
   msg.WriteToLogFile();
   OS::SignalCodeMovingGC();
 #endif
@@ -890,16 +820,13 @@ void Logger::RegExpCodeCreateEvent(Code* code, String* source) {
   if (!Log::IsEnabled() || !FLAG_log_code) return;
   LogMessageBuilder msg;
   msg.Append("%s,%s,",
-             log_events_[CODE_CREATION_EVENT], log_events_[REG_EXP_TAG]);
+             kLogEventsNames[CODE_CREATION_EVENT],
+             kLogEventsNames[REG_EXP_TAG]);
   msg.AppendAddress(code->address());
   msg.Append(",%d,\"", code->ExecutableSize());
   msg.AppendDetailed(source, false);
   msg.Append('\"');
   LowLevelCodeCreateEvent(code, &msg);
-  if (FLAG_compress_log) {
-    ASSERT(compression_helper_ != NULL);
-    if (!compression_helper_->HandleMessage(&msg)) return;
-  }
   msg.Append('\n');
   msg.WriteToLogFile();
 #endif
@@ -924,13 +851,9 @@ void Logger::SnapshotPositionEvent(Address addr, int pos) {
 #ifdef ENABLE_LOGGING_AND_PROFILING
   if (!Log::IsEnabled() || !FLAG_log_snapshot_positions) return;
   LogMessageBuilder msg;
-  msg.Append("%s,", log_events_[SNAPSHOT_POSITION_EVENT]);
+  msg.Append("%s,", kLogEventsNames[SNAPSHOT_POSITION_EVENT]);
   msg.AppendAddress(addr);
   msg.Append(",%d", pos);
-  if (FLAG_compress_log) {
-    ASSERT(compression_helper_ != NULL);
-    if (!compression_helper_->HandleMessage(&msg)) return;
-  }
   msg.Append('\n');
   msg.WriteToLogFile();
 #endif
@@ -942,18 +865,12 @@ void Logger::FunctionCreateEvent(JSFunction* function) {
   // This function can be called from GC iterators (during Scavenge,
   // MC, and MS), so marking bits can be set on objects. That's
   // why unchecked accessors are used here.
-  static Address prev_code = NULL;
   if (!Log::IsEnabled() || !FLAG_log_code) return;
   LogMessageBuilder msg;
-  msg.Append("%s,", log_events_[FUNCTION_CREATION_EVENT]);
+  msg.Append("%s,", kLogEventsNames[FUNCTION_CREATION_EVENT]);
   msg.AppendAddress(function->address());
   msg.Append(',');
-  msg.AppendAddress(function->unchecked_code()->address(), prev_code);
-  prev_code = function->unchecked_code()->address();
-  if (FLAG_compress_log) {
-    ASSERT(compression_helper_ != NULL);
-    if (!compression_helper_->HandleMessage(&msg)) return;
-  }
+  msg.AppendAddress(function->unchecked_code()->address());
   msg.Append('\n');
   msg.WriteToLogFile();
 #endif
@@ -987,18 +904,12 @@ void Logger::FunctionDeleteEvent(Address from) {
 void Logger::MoveEventInternal(LogEventsAndTags event,
                                Address from,
                                Address to) {
-  static Address prev_to_ = NULL;
   if (!Log::IsEnabled() || !FLAG_log_code) return;
   LogMessageBuilder msg;
-  msg.Append("%s,", log_events_[event]);
+  msg.Append("%s,", kLogEventsNames[event]);
   msg.AppendAddress(from);
   msg.Append(',');
-  msg.AppendAddress(to, prev_to_);
-  prev_to_ = to;
-  if (FLAG_compress_log) {
-    ASSERT(compression_helper_ != NULL);
-    if (!compression_helper_->HandleMessage(&msg)) return;
-  }
+  msg.AppendAddress(to);
   msg.Append('\n');
   msg.WriteToLogFile();
 }
@@ -1009,12 +920,8 @@ void Logger::MoveEventInternal(LogEventsAndTags event,
 void Logger::DeleteEventInternal(LogEventsAndTags event, Address from) {
   if (!Log::IsEnabled() || !FLAG_log_code) return;
   LogMessageBuilder msg;
-  msg.Append("%s,", log_events_[event]);
+  msg.Append("%s,", kLogEventsNames[event]);
   msg.AppendAddress(from);
-  if (FLAG_compress_log) {
-    ASSERT(compression_helper_ != NULL);
-    if (!compression_helper_->HandleMessage(&msg)) return;
-  }
   msg.Append('\n');
   msg.WriteToLogFile();
 }
@@ -1202,30 +1109,20 @@ void Logger::DebugEvent(const char* event_type, Vector<uint16_t> parameter) {
 #ifdef ENABLE_LOGGING_AND_PROFILING
 void Logger::TickEvent(TickSample* sample, bool overflow) {
   if (!Log::IsEnabled() || !FLAG_prof) return;
-  static Address prev_sp = NULL;
-  static Address prev_function = NULL;
   LogMessageBuilder msg;
-  msg.Append("%s,", log_events_[TICK_EVENT]);
-  Address prev_addr = sample->pc;
-  msg.AppendAddress(prev_addr);
+  msg.Append("%s,", kLogEventsNames[TICK_EVENT]);
+  msg.AppendAddress(sample->pc);
   msg.Append(',');
-  msg.AppendAddress(sample->sp, prev_sp);
-  prev_sp = sample->sp;
+  msg.AppendAddress(sample->sp);
   msg.Append(',');
-  msg.AppendAddress(sample->function, prev_function);
-  prev_function = sample->function;
+  msg.AppendAddress(sample->function);
   msg.Append(",%d", static_cast<int>(sample->state));
   if (overflow) {
     msg.Append(",overflow");
   }
   for (int i = 0; i < sample->frames_count; ++i) {
     msg.Append(',');
-    msg.AppendAddress(sample->stack[i], prev_addr);
-    prev_addr = sample->stack[i];
-  }
-  if (FLAG_compress_log) {
-    ASSERT(compression_helper_ != NULL);
-    if (!compression_helper_->HandleMessage(&msg)) return;
+    msg.AppendAddress(sample->stack[i]);
   }
   msg.Append('\n');
   msg.WriteToLogFile();
@@ -1654,12 +1551,6 @@ bool Logger::Setup() {
     sliding_state_window_ = new SlidingStateWindow();
   }
 
-  log_events_ = FLAG_compress_log ?
-      kCompressedLogEventsNames : kLongLogEventsNames;
-  if (FLAG_compress_log) {
-    compression_helper_ = new CompressionHelper(kCompressionWindowSize);
-  }
-
   if (start_logging) {
     logging_nesting_ = 1;
   }
@@ -1707,9 +1598,6 @@ void Logger::TearDown() {
     profiler_ = NULL;
   }
 
-  delete compression_helper_;
-  compression_helper_ = NULL;
-
   delete sliding_state_window_;
   sliding_state_window_ = NULL;
 
diff --git a/deps/v8/src/log.h b/deps/v8/src/log.h
index 54b131bb0c..771709c8a1 100644
--- a/deps/v8/src/log.h
+++ b/deps/v8/src/log.h
@@ -74,7 +74,6 @@ class Profiler;
 class Semaphore;
 class SlidingStateWindow;
 class LogMessageBuilder;
-class CompressionHelper;
 
 #undef LOG
 #ifdef ENABLE_LOGGING_AND_PROFILING
@@ -88,58 +87,55 @@ class CompressionHelper;
 #endif
 
 #define LOG_EVENTS_AND_TAGS_LIST(V) \
-  V(CODE_CREATION_EVENT,            "code-creation",          "cc")       \
-  V(CODE_MOVE_EVENT,                "code-move",              "cm")       \
-  V(CODE_DELETE_EVENT,              "code-delete",            "cd")       \
-  V(CODE_MOVING_GC,                 "code-moving-gc",         "cg")       \
-  V(FUNCTION_CREATION_EVENT,        "function-creation",      "fc")       \
-  V(FUNCTION_MOVE_EVENT,            "function-move",          "fm")       \
-  V(FUNCTION_DELETE_EVENT,          "function-delete",        "fd")       \
-  V(SNAPSHOT_POSITION_EVENT,        "snapshot-pos",           "sp")       \
-  V(TICK_EVENT,                     "tick",                   "t")        \
-  V(REPEAT_META_EVENT,              "repeat",                 "r")        \
-  V(BUILTIN_TAG,                    "Builtin",                "bi")       \
-  V(CALL_DEBUG_BREAK_TAG,           "CallDebugBreak",         "cdb")      \
-  V(CALL_DEBUG_PREPARE_STEP_IN_TAG, "CallDebugPrepareStepIn", "cdbsi")    \
-  V(CALL_IC_TAG,                    "CallIC",                 "cic")      \
-  V(CALL_INITIALIZE_TAG,            "CallInitialize",         "ci")       \
-  V(CALL_MEGAMORPHIC_TAG,           "CallMegamorphic",        "cmm")      \
-  V(CALL_MISS_TAG,                  "CallMiss",               "cm")       \
-  V(CALL_NORMAL_TAG,                "CallNormal",             "cn")       \
-  V(CALL_PRE_MONOMORPHIC_TAG,       "CallPreMonomorphic",     "cpm")      \
-  V(KEYED_CALL_DEBUG_BREAK_TAG,     "KeyedCallDebugBreak",    "kcdb")     \
-  V(KEYED_CALL_DEBUG_PREPARE_STEP_IN_TAG,                                 \
-    "KeyedCallDebugPrepareStepIn",                                        \
-    "kcdbsi")                                                             \
-  V(KEYED_CALL_IC_TAG,              "KeyedCallIC",            "kcic")     \
-  V(KEYED_CALL_INITIALIZE_TAG,      "KeyedCallInitialize",    "kci")      \
-  V(KEYED_CALL_MEGAMORPHIC_TAG,     "KeyedCallMegamorphic",   "kcmm")     \
-  V(KEYED_CALL_MISS_TAG,            "KeyedCallMiss",          "kcm")      \
-  V(KEYED_CALL_NORMAL_TAG,          "KeyedCallNormal",        "kcn")      \
-  V(KEYED_CALL_PRE_MONOMORPHIC_TAG,                                       \
-    "KeyedCallPreMonomorphic",                                            \
-    "kcpm")                                                               \
-  V(CALLBACK_TAG,                   "Callback",               "cb")       \
-  V(EVAL_TAG,                       "Eval",                   "e")        \
-  V(FUNCTION_TAG,                   "Function",               "f")        \
-  V(KEYED_LOAD_IC_TAG,              "KeyedLoadIC",            "klic")     \
-  V(KEYED_STORE_IC_TAG,             "KeyedStoreIC",           "ksic")     \
-  V(LAZY_COMPILE_TAG,               "LazyCompile",            "lc")       \
-  V(LOAD_IC_TAG,                    "LoadIC",                 "lic")      \
-  V(REG_EXP_TAG,                    "RegExp",                 "re")       \
-  V(SCRIPT_TAG,                     "Script",                 "sc")       \
-  V(STORE_IC_TAG,                   "StoreIC",                "sic")      \
-  V(STUB_TAG,                       "Stub",                   "s")        \
-  V(NATIVE_FUNCTION_TAG,            "Function",               "f")        \
-  V(NATIVE_LAZY_COMPILE_TAG,        "LazyCompile",            "lc")       \
-  V(NATIVE_SCRIPT_TAG,              "Script",                 "sc")
+  V(CODE_CREATION_EVENT,            "code-creation")            \
+  V(CODE_MOVE_EVENT,                "code-move")                \
+  V(CODE_DELETE_EVENT,              "code-delete")              \
+  V(CODE_MOVING_GC,                 "code-moving-gc")           \
+  V(FUNCTION_CREATION_EVENT,        "function-creation")        \
+  V(FUNCTION_MOVE_EVENT,            "function-move")            \
+  V(FUNCTION_DELETE_EVENT,          "function-delete")          \
+  V(SNAPSHOT_POSITION_EVENT,        "snapshot-pos")             \
+  V(TICK_EVENT,                     "tick")                     \
+  V(REPEAT_META_EVENT,              "repeat")                   \
+  V(BUILTIN_TAG,                    "Builtin")                  \
+  V(CALL_DEBUG_BREAK_TAG,           "CallDebugBreak")           \
+  V(CALL_DEBUG_PREPARE_STEP_IN_TAG, "CallDebugPrepareStepIn")   \
+  V(CALL_IC_TAG,                    "CallIC")                   \
+  V(CALL_INITIALIZE_TAG,            "CallInitialize")           \
+  V(CALL_MEGAMORPHIC_TAG,           "CallMegamorphic")          \
+  V(CALL_MISS_TAG,                  "CallMiss")                 \
+  V(CALL_NORMAL_TAG,                "CallNormal")               \
+  V(CALL_PRE_MONOMORPHIC_TAG,       "CallPreMonomorphic")       \
+  V(KEYED_CALL_DEBUG_BREAK_TAG,     "KeyedCallDebugBreak")      \
+  V(KEYED_CALL_DEBUG_PREPARE_STEP_IN_TAG,                       \
+    "KeyedCallDebugPrepareStepIn")                              \
+  V(KEYED_CALL_IC_TAG,              "KeyedCallIC")              \
+  V(KEYED_CALL_INITIALIZE_TAG,      "KeyedCallInitialize")      \
+  V(KEYED_CALL_MEGAMORPHIC_TAG,     "KeyedCallMegamorphic")     \
+  V(KEYED_CALL_MISS_TAG,            "KeyedCallMiss")            \
+  V(KEYED_CALL_NORMAL_TAG,          "KeyedCallNormal")          \
+  V(KEYED_CALL_PRE_MONOMORPHIC_TAG, "KeyedCallPreMonomorphic")  \
+  V(CALLBACK_TAG,                   "Callback")                 \
+  V(EVAL_TAG,                       "Eval")                     \
+  V(FUNCTION_TAG,                   "Function")                 \
+  V(KEYED_LOAD_IC_TAG,              "KeyedLoadIC")              \
+  V(KEYED_STORE_IC_TAG,             "KeyedStoreIC")             \
+  V(LAZY_COMPILE_TAG,               "LazyCompile")              \
+  V(LOAD_IC_TAG,                    "LoadIC")                   \
+  V(REG_EXP_TAG,                    "RegExp")                   \
+  V(SCRIPT_TAG,                     "Script")                   \
+  V(STORE_IC_TAG,                   "StoreIC")                  \
+  V(STUB_TAG,                       "Stub")                     \
+  V(NATIVE_FUNCTION_TAG,            "Function")                 \
+  V(NATIVE_LAZY_COMPILE_TAG,        "LazyCompile")              \
+  V(NATIVE_SCRIPT_TAG,              "Script")
 // Note that 'NATIVE_' cases for functions and scripts are mapped onto
 // original tags when writing to the log.
 
 
 class Logger {
  public:
-#define DECLARE_ENUM(enum_item, ignore1, ignore2) enum_item,
+#define DECLARE_ENUM(enum_item, ignore) enum_item,
   enum LogEventsAndTags {
     LOG_EVENTS_AND_TAGS_LIST(DECLARE_ENUM)
     NUMBER_OF_LOG_EVENTS
@@ -292,9 +288,6 @@ class Logger {
 
  private:
 
-  // Size of window used for log records compression.
-  static const int kCompressionWindowSize = 4;
-
   // Emits the profiler's first message.
   static void ProfilerBeginEvent();
 
@@ -312,9 +305,6 @@ class Logger {
   static void DeleteEventInternal(LogEventsAndTags event,
                                   Address from);
 
-  // Emits aliases for compressed messages.
-  static void LogAliases();
-
   // Emits the source code of a regexp. Used by regexp events.
   static void LogRegExpSource(Handle<JSRegExp> regexp);
 
@@ -357,15 +347,8 @@ class Logger {
   // recent VM states.
   static SlidingStateWindow* sliding_state_window_;
 
-  // An array of log events names.
-  static const char** log_events_;
-
-  // An instance of helper created if log compression is enabled.
-  static CompressionHelper* compression_helper_;
-
   // Internal implementation classes with access to
   // private members.
-  friend class CompressionHelper;
   friend class EventLog;
   friend class TimeLog;
   friend class Profiler;
diff --git a/deps/v8/src/math.js b/deps/v8/src/math.js
index fa1934da41..2e886d099a 100644
--- a/deps/v8/src/math.js
+++ b/deps/v8/src/math.js
@@ -264,6 +264,7 @@ function SetupMath() {
   %SetMathFunctionId($Math.round, 2);
   %SetMathFunctionId($Math.abs, 4);
   %SetMathFunctionId($Math.sqrt, 0xd);
+  %SetMathFunctionId($Math.pow, 0xe);
   // TODO(erikcorry): Set the id of the other functions so they can be
   // optimized.
 };
diff --git a/deps/v8/src/objects.h b/deps/v8/src/objects.h
index 1827ab0114..c3958e2396 100644
--- a/deps/v8/src/objects.h
+++ b/deps/v8/src/objects.h
@@ -3729,7 +3729,9 @@ enum MathFunctionId {
   kMathACos = 0xa,
   kMathATan = 0xb,
   kMathExp = 0xc,
-  kMathSqrt = 0xd
+  kMathSqrt = 0xd,
+  kMathPow = 0xe,
+  kMathPowHalf = 0xf
 };
 
 
@@ -4154,11 +4156,11 @@ class SharedFunctionInfo: public HeapObject {
   static const int kTryFullCodegen = 1;
   static const int kAllowLazyCompilation = 2;
   static const int kMathFunctionShift = 3;
-  static const int kMathFunctionMask = 0xf;
-  static const int kLiveObjectsMayExist = 7;
-  static const int kCodeAgeShift = 8;
+  static const int kMathFunctionMask = 0x1f;
+  static const int kLiveObjectsMayExist = 8;
+  static const int kCodeAgeShift = 9;
   static const int kCodeAgeMask = 0x7;
-  static const int kOptimizationDisabled = 11;
+  static const int kOptimizationDisabled = 12;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(SharedFunctionInfo);
 };
diff --git a/deps/v8/src/parser.cc b/deps/v8/src/parser.cc
index 056332b5b4..94ad57c9c2 100644
--- a/deps/v8/src/parser.cc
+++ b/deps/v8/src/parser.cc
@@ -609,7 +609,25 @@ FunctionLiteral* Parser::ParseProgram(Handle<String> source,
 
   // Initialize parser state.
   source->TryFlatten();
-  scanner_.Initialize(source);
+  if (source->IsExternalTwoByteString()) {
+    // Notice that the stream is destroyed at the end of the branch block.
+    // The last line of the blocks can't be moved outside, even though they're
+    // identical calls.
+    ExternalTwoByteStringUC16CharacterStream stream(
+        Handle<ExternalTwoByteString>::cast(source), 0, source->length());
+    scanner_.Initialize(&stream, JavaScriptScanner::kAllLiterals);
+    return DoParseProgram(source, in_global_context, &zone_scope);
+  } else {
+    GenericStringUC16CharacterStream stream(source, 0, source->length());
+    scanner_.Initialize(&stream, JavaScriptScanner::kAllLiterals);
+    return DoParseProgram(source, in_global_context, &zone_scope);
+  }
+}
+
+
+FunctionLiteral* Parser::DoParseProgram(Handle<String> source,
+                                        bool in_global_context,
+                                        ZoneScope* zone_scope) {
   ASSERT(target_stack_ == NULL);
   if (pre_data_ != NULL) pre_data_->Initialize();
 
@@ -655,25 +673,45 @@ FunctionLiteral* Parser::ParseProgram(Handle<String> source,
 
   // If there was a syntax error we have to get rid of the AST
   // and it is not safe to do so before the scope has been deleted.
-  if (result == NULL) zone_scope.DeleteOnExit();
+  if (result == NULL) zone_scope->DeleteOnExit();
   return result;
 }
 
-
 FunctionLiteral* Parser::ParseLazy(Handle<SharedFunctionInfo> info) {
   CompilationZoneScope zone_scope(DONT_DELETE_ON_EXIT);
   HistogramTimerScope timer(&Counters::parse_lazy);
   Handle<String> source(String::cast(script_->source()));
   Counters::total_parse_size.Increment(source->length());
 
+  // Initialize parser state.
+  source->TryFlatten();
+  if (source->IsExternalTwoByteString()) {
+    ExternalTwoByteStringUC16CharacterStream stream(
+        Handle<ExternalTwoByteString>::cast(source),
+        info->start_position(),
+        info->end_position());
+    FunctionLiteral* result = ParseLazy(info, &stream, &zone_scope);
+    return result;
+  } else {
+    GenericStringUC16CharacterStream stream(source,
+                                            info->start_position(),
+                                            info->end_position());
+    FunctionLiteral* result = ParseLazy(info, &stream, &zone_scope);
+    return result;
+  }
+}
+
+
+FunctionLiteral* Parser::ParseLazy(Handle<SharedFunctionInfo> info,
+                                   UC16CharacterStream* source,
+                                   ZoneScope* zone_scope) {
+  scanner_.Initialize(source, JavaScriptScanner::kAllLiterals);
+  ASSERT(target_stack_ == NULL);
+
   Handle<String> name(String::cast(info->name()));
   fni_ = new FuncNameInferrer();
   fni_->PushEnclosingName(name);
 
-  // Initialize parser state.
-  source->TryFlatten();
-  scanner_.Initialize(source, info->start_position(), info->end_position());
-  ASSERT(target_stack_ == NULL);
   mode_ = PARSE_EAGERLY;
 
   // Place holder for the result.
@@ -705,7 +743,7 @@ FunctionLiteral* Parser::ParseLazy(Handle<SharedFunctionInfo> info) {
   // not safe to do before scope has been deleted.
   if (result == NULL) {
     Top::StackOverflow();
-    zone_scope.DeleteOnExit();
+    zone_scope->DeleteOnExit();
   } else {
     Handle<String> inferred_name(info->inferred_name());
     result->set_inferred_name(inferred_name);
@@ -719,12 +757,12 @@ Handle<String> Parser::GetSymbol(bool* ok) {
   if (pre_data() != NULL) {
     symbol_id = pre_data()->GetSymbolIdentifier();
   }
-  return LookupSymbol(symbol_id, scanner_.literal());
+  return LookupSymbol(symbol_id, scanner().literal());
 }
 
 
 void Parser::ReportMessage(const char* type, Vector<const char*> args) {
-  Scanner::Location source_location = scanner_.location();
+  Scanner::Location source_location = scanner().location();
   ReportMessageAt(source_location, type, args);
 }
 
@@ -1641,7 +1679,7 @@ Statement* Parser::ParseContinueStatement(bool* ok) {
   Expect(Token::CONTINUE, CHECK_OK);
   Handle<String> label = Handle<String>::null();
   Token::Value tok = peek();
-  if (!scanner_.has_line_terminator_before_next() &&
+  if (!scanner().has_line_terminator_before_next() &&
       tok != Token::SEMICOLON && tok != Token::RBRACE && tok != Token::EOS) {
     label = ParseIdentifier(CHECK_OK);
   }
@@ -1667,7 +1705,7 @@ Statement* Parser::ParseBreakStatement(ZoneStringList* labels, bool* ok) {
   Expect(Token::BREAK, CHECK_OK);
   Handle<String> label;
   Token::Value tok = peek();
-  if (!scanner_.has_line_terminator_before_next() &&
+  if (!scanner().has_line_terminator_before_next() &&
       tok != Token::SEMICOLON && tok != Token::RBRACE && tok != Token::EOS) {
     label = ParseIdentifier(CHECK_OK);
   }
@@ -1712,7 +1750,7 @@ Statement* Parser::ParseReturnStatement(bool* ok) {
   }
 
   Token::Value tok = peek();
-  if (scanner_.has_line_terminator_before_next() ||
+  if (scanner().has_line_terminator_before_next() ||
       tok == Token::SEMICOLON ||
       tok == Token::RBRACE ||
       tok == Token::EOS) {
@@ -1844,7 +1882,7 @@ Statement* Parser::ParseThrowStatement(bool* ok) {
 
   Expect(Token::THROW, CHECK_OK);
   int pos = scanner().location().beg_pos;
-  if (scanner_.has_line_terminator_before_next()) {
+  if (scanner().has_line_terminator_before_next()) {
     ReportMessage("newline_after_throw", Vector<const char*>::empty());
     *ok = false;
     return NULL;
@@ -2408,7 +2446,8 @@ Expression* Parser::ParsePostfixExpression(bool* ok) {
   //   LeftHandSideExpression ('++' | '--')?
 
   Expression* expression = ParseLeftHandSideExpression(CHECK_OK);
-  if (!scanner_.has_line_terminator_before_next() && Token::IsCountOp(peek())) {
+  if (!scanner().has_line_terminator_before_next() &&
+      Token::IsCountOp(peek())) {
     // Signal a reference error if the expression is an invalid
     // left-hand side expression.  We could report this as a syntax
     // error here but for compatibility with JSC we choose to report the
@@ -2677,7 +2716,7 @@ Expression* Parser::ParsePrimaryExpression(bool* ok) {
     case Token::NUMBER: {
       Consume(Token::NUMBER);
       double value =
-        StringToDouble(scanner_.literal(), ALLOW_HEX | ALLOW_OCTALS);
+        StringToDouble(scanner().literal(), ALLOW_HEX | ALLOW_OCTALS);
       result = NewNumberLiteral(value);
       break;
     }
@@ -3028,7 +3067,7 @@ Expression* Parser::ParseObjectLiteral(bool* ok) {
       case Token::NUMBER: {
         Consume(Token::NUMBER);
         double value =
-          StringToDouble(scanner_.literal(), ALLOW_HEX | ALLOW_OCTALS);
+          StringToDouble(scanner().literal(), ALLOW_HEX | ALLOW_OCTALS);
         key = NewNumberLiteral(value);
         break;
       }
@@ -3089,7 +3128,7 @@ Expression* Parser::ParseObjectLiteral(bool* ok) {
 
 
 Expression* Parser::ParseRegExpLiteral(bool seen_equal, bool* ok) {
-  if (!scanner_.ScanRegExpPattern(seen_equal)) {
+  if (!scanner().ScanRegExpPattern(seen_equal)) {
     Next();
     ReportMessage("unterminated_regexp", Vector<const char*>::empty());
     *ok = false;
@@ -3099,10 +3138,10 @@ Expression* Parser::ParseRegExpLiteral(bool seen_equal, bool* ok) {
   int literal_index = temp_scope_->NextMaterializedLiteralIndex();
 
   Handle<String> js_pattern =
-      Factory::NewStringFromUtf8(scanner_.next_literal(), TENURED);
-  scanner_.ScanRegExpFlags();
+      Factory::NewStringFromUtf8(scanner().next_literal(), TENURED);
+  scanner().ScanRegExpFlags();
   Handle<String> js_flags =
-      Factory::NewStringFromUtf8(scanner_.next_literal(), TENURED);
+      Factory::NewStringFromUtf8(scanner().next_literal(), TENURED);
   Next();
 
   return new RegExpLiteral(js_pattern, js_flags, literal_index);
@@ -3158,7 +3197,7 @@ FunctionLiteral* Parser::ParseFunctionLiteral(Handle<String> var_name,
     //  FormalParameterList ::
     //    '(' (Identifier)*[','] ')'
     Expect(Token::LPAREN, CHECK_OK);
-    int start_pos = scanner_.location().beg_pos;
+    int start_pos = scanner().location().beg_pos;
     bool done = (peek() == Token::RPAREN);
     while (!done) {
       Handle<String> param_name = ParseIdentifier(CHECK_OK);
@@ -3195,7 +3234,7 @@ FunctionLiteral* Parser::ParseFunctionLiteral(Handle<String> var_name,
     bool is_lazily_compiled =
         mode() == PARSE_LAZILY && top_scope_->HasTrivialOuterContext();
 
-    int function_block_pos = scanner_.location().beg_pos;
+    int function_block_pos = scanner().location().beg_pos;
     int materialized_literal_count;
     int expected_property_count;
     int end_pos;
@@ -3212,7 +3251,8 @@ FunctionLiteral* Parser::ParseFunctionLiteral(Handle<String> var_name,
         ReportInvalidPreparseData(name, CHECK_OK);
       }
       Counters::total_preparse_skipped.Increment(end_pos - function_block_pos);
-      scanner_.SeekForward(end_pos);
+      // Seek to position just before terminal '}'.
+      scanner().SeekForward(end_pos - 1);
       materialized_literal_count = entry.literal_count();
       expected_property_count = entry.property_count();
       only_simple_this_property_assignments = false;
@@ -3228,7 +3268,7 @@ FunctionLiteral* Parser::ParseFunctionLiteral(Handle<String> var_name,
       this_property_assignments = temp_scope.this_property_assignments();
 
       Expect(Token::RBRACE, CHECK_OK);
-      end_pos = scanner_.location().end_pos;
+      end_pos = scanner().location().end_pos;
     }
 
     FunctionLiteral* function_literal =
@@ -3332,7 +3372,7 @@ void Parser::ExpectSemicolon(bool* ok) {
     Next();
     return;
   }
-  if (scanner_.has_line_terminator_before_next() ||
+  if (scanner().has_line_terminator_before_next() ||
       tok == Token::RBRACE ||
       tok == Token::EOS) {
     return;
@@ -3383,8 +3423,8 @@ Handle<String> Parser::ParseIdentifierOrGetOrSet(bool* is_get,
                                                  bool* ok) {
   Expect(Token::IDENTIFIER, ok);
   if (!*ok) return Handle<String>();
-  if (scanner_.literal_length() == 3) {
-    const char* token = scanner_.literal_string();
+  if (scanner().literal_length() == 3) {
+    const char* token = scanner().literal_string();
     *is_get = strcmp(token, "get") == 0;
     *is_set = !*is_get && strcmp(token, "set") == 0;
   }
@@ -3503,8 +3543,8 @@ Expression* Parser::NewThrowError(Handle<String> constructor,
 // ----------------------------------------------------------------------------
 // JSON
 
-Handle<Object> JsonParser::ParseJson(Handle<String> source) {
-  source->TryFlatten();
+Handle<Object> JsonParser::ParseJson(Handle<String> script,
+                                     UC16CharacterStream* source) {
   scanner_.Initialize(source);
   stack_overflow_ = false;
   Handle<Object> result = ParseJsonValue();
@@ -3540,7 +3580,7 @@ Handle<Object> JsonParser::ParseJson(Handle<String> source) {
       }
 
       Scanner::Location source_location = scanner_.location();
-      MessageLocation location(Factory::NewScript(source),
+      MessageLocation location(Factory::NewScript(script),
                                source_location.beg_pos,
                                source_location.end_pos);
       int argc = (name_opt == NULL) ? 0 : 1;
@@ -4409,10 +4449,25 @@ CharacterRange RegExpParser::ParseClassAtom(uc16* char_class) {
 }
 
 
+static const uc16 kNoCharClass = 0;
+
+// Adds range or pre-defined character class to character ranges.
+// If char_class is not kInvalidClass, it's interpreted as a class
+// escape (i.e., 's' means whitespace, from '\s').
+static inline void AddRangeOrEscape(ZoneList<CharacterRange>* ranges,
+                                    uc16 char_class,
+                                    CharacterRange range) {
+  if (char_class != kNoCharClass) {
+    CharacterRange::AddClassEscape(char_class, ranges);
+  } else {
+    ranges->Add(range);
+  }
+}
+
+
 RegExpTree* RegExpParser::ParseCharacterClass() {
   static const char* kUnterminated = "Unterminated character class";
   static const char* kRangeOutOfOrder = "Range out of order in character class";
-  static const char* kInvalidRange = "Invalid character range";
 
   ASSERT_EQ(current(), '[');
   Advance();
@@ -4421,30 +4476,10 @@ RegExpTree* RegExpParser::ParseCharacterClass() {
     is_negated = true;
     Advance();
   }
-  // A CharacterClass is a sequence of single characters, character class
-  // escapes or ranges. Ranges are on the form "x-y" where x and y are
-  // single characters (and not character class escapes like \s).
-  // A "-" may occur at the start or end of the character class (just after
-  // "[" or "[^", or just before "]") without being considered part of a
-  // range. A "-" may also appear as the beginning or end of a range.
-  // I.e., [--+] is valid, so is [!--].
-
   ZoneList<CharacterRange>* ranges = new ZoneList<CharacterRange>(2);
   while (has_more() && current() != ']') {
-    uc16 char_class = 0;
+    uc16 char_class = kNoCharClass;
     CharacterRange first = ParseClassAtom(&char_class CHECK_FAILED);
-    if (char_class) {
-      CharacterRange::AddClassEscape(char_class, ranges);
-      if (current() == '-') {
-        Advance();
-        ranges->Add(CharacterRange::Singleton('-'));
-        if (current() != ']') {
-          ReportError(CStrVector(kInvalidRange) CHECK_FAILED);
-        }
-        break;
-      }
-      continue;
-    }
     if (current() == '-') {
       Advance();
       if (current() == kEndMarker) {
@@ -4452,20 +4487,25 @@ RegExpTree* RegExpParser::ParseCharacterClass() {
         // following code report an error.
         break;
       } else if (current() == ']') {
-        ranges->Add(first);
+        AddRangeOrEscape(ranges, char_class, first);
         ranges->Add(CharacterRange::Singleton('-'));
         break;
       }
-      CharacterRange next = ParseClassAtom(&char_class CHECK_FAILED);
-      if (char_class) {
-        ReportError(CStrVector(kInvalidRange) CHECK_FAILED);
+      uc16 char_class_2 = kNoCharClass;
+      CharacterRange next = ParseClassAtom(&char_class_2 CHECK_FAILED);
+      if (char_class != kNoCharClass || char_class_2 != kNoCharClass) {
+        // Either end is an escaped character class. Treat the '-' verbatim.
+        AddRangeOrEscape(ranges, char_class, first);
+        ranges->Add(CharacterRange::Singleton('-'));
+        AddRangeOrEscape(ranges, char_class_2, next);
+        continue;
       }
       if (first.from() > next.to()) {
         return ReportError(CStrVector(kRangeOutOfOrder) CHECK_FAILED);
       }
       ranges->Add(CharacterRange::Range(first.from(), next.to()));
     } else {
-      ranges->Add(first);
+      AddRangeOrEscape(ranges, char_class, first);
     }
   }
   if (!has_more()) {
@@ -4555,13 +4595,12 @@ int ScriptDataImpl::ReadNumber(byte** source) {
 
 
 // Create a Scanner for the preparser to use as input, and preparse the source.
-static ScriptDataImpl* DoPreParse(Handle<String> source,
-                                  unibrow::CharacterStream* stream,
+static ScriptDataImpl* DoPreParse(UC16CharacterStream* source,
                                   bool allow_lazy,
                                   ParserRecorder* recorder,
                                   int literal_flags) {
   V8JavaScriptScanner scanner;
-  scanner.Initialize(source, stream, literal_flags);
+  scanner.Initialize(source, literal_flags);
   intptr_t stack_limit = StackGuard::real_climit();
   if (!preparser::PreParser::PreParseProgram(&scanner,
                                              recorder,
@@ -4580,8 +4619,7 @@ static ScriptDataImpl* DoPreParse(Handle<String> source,
 
 // Preparse, but only collect data that is immediately useful,
 // even if the preparser data is only used once.
-ScriptDataImpl* ParserApi::PartialPreParse(Handle<String> source,
-                                           unibrow::CharacterStream* stream,
+ScriptDataImpl* ParserApi::PartialPreParse(UC16CharacterStream* source,
                                            v8::Extension* extension) {
   bool allow_lazy = FLAG_lazy && (extension == NULL);
   if (!allow_lazy) {
@@ -4590,22 +4628,19 @@ ScriptDataImpl* ParserApi::PartialPreParse(Handle<String> source,
     return NULL;
   }
   PartialParserRecorder recorder;
-
-  return DoPreParse(source, stream, allow_lazy, &recorder,
+  return DoPreParse(source, allow_lazy, &recorder,
                     JavaScriptScanner::kNoLiterals);
 }
 
 
-ScriptDataImpl* ParserApi::PreParse(Handle<String> source,
-                                    unibrow::CharacterStream* stream,
+ScriptDataImpl* ParserApi::PreParse(UC16CharacterStream* source,
                                     v8::Extension* extension) {
   Handle<Script> no_script;
   bool allow_lazy = FLAG_lazy && (extension == NULL);
   CompleteParserRecorder recorder;
   int kPreParseLiteralsFlags =
       JavaScriptScanner::kLiteralString | JavaScriptScanner::kLiteralIdentifier;
-  return DoPreParse(source, stream, allow_lazy,
-                    &recorder, kPreParseLiteralsFlags);
+  return DoPreParse(source, allow_lazy, &recorder, kPreParseLiteralsFlags);
 }
 
 
diff --git a/deps/v8/src/parser.h b/deps/v8/src/parser.h
index 58cd946cad..70d0e18fdb 100644
--- a/deps/v8/src/parser.h
+++ b/deps/v8/src/parser.h
@@ -169,14 +169,12 @@ class ParserApi {
   static bool Parse(CompilationInfo* info);
 
   // Generic preparser generating full preparse data.
-  static ScriptDataImpl* PreParse(Handle<String> source,
-                                  unibrow::CharacterStream* stream,
+  static ScriptDataImpl* PreParse(UC16CharacterStream* source,
                                   v8::Extension* extension);
 
   // Preparser that only does preprocessing that makes sense if only used
   // immediately after.
-  static ScriptDataImpl* PartialPreParse(Handle<String> source,
-                                         unibrow::CharacterStream* stream,
+  static ScriptDataImpl* PartialPreParse(UC16CharacterStream* source,
                                          v8::Extension* extension);
 };
 
@@ -435,18 +433,26 @@ class Parser {
                        Vector<const char*> args);
 
  protected:
+  FunctionLiteral* ParseLazy(Handle<SharedFunctionInfo> info,
+                             UC16CharacterStream* source,
+                             ZoneScope* zone_scope);
   enum Mode {
     PARSE_LAZILY,
     PARSE_EAGERLY
   };
 
+  // Called by ParseProgram after setting up the scanner.
+  FunctionLiteral* DoParseProgram(Handle<String> source,
+                                  bool in_global_context,
+                                  ZoneScope* zone_scope);
+
   // Report syntax error
   void ReportUnexpectedToken(Token::Value token);
   void ReportInvalidPreparseData(Handle<String> name, bool* ok);
   void ReportMessage(const char* message, Vector<const char*> args);
 
   bool inside_with() const { return with_nesting_level_ > 0; }
-  Scanner& scanner()  { return scanner_; }
+  V8JavaScriptScanner& scanner()  { return scanner_; }
   Mode mode() const { return mode_; }
   ScriptDataImpl* pre_data() const { return pre_data_; }
 
@@ -548,7 +554,7 @@ class Parser {
 
   INLINE(Token::Value peek()) {
     if (stack_overflow_) return Token::ILLEGAL;
-    return scanner_.peek();
+    return scanner().peek();
   }
 
   INLINE(Token::Value Next()) {
@@ -560,9 +566,11 @@ class Parser {
     }
     if (StackLimitCheck().HasOverflowed()) {
       // Any further calls to Next or peek will return the illegal token.
+      // The current call must return the next token, which might already
+      // have been peek'ed.
       stack_overflow_ = true;
     }
-    return scanner_.Next();
+    return scanner().Next();
   }
 
   INLINE(void Consume(Token::Value token));
@@ -702,7 +710,14 @@ class JsonParser BASE_EMBEDDED {
   // Parse JSON input as a single JSON value.
   // Returns null handle and sets exception if parsing failed.
   static Handle<Object> Parse(Handle<String> source) {
-    return JsonParser().ParseJson(source);
+    if (source->IsExternalTwoByteString()) {
+      ExternalTwoByteStringUC16CharacterStream stream(
+          Handle<ExternalTwoByteString>::cast(source), 0, source->length());
+      return JsonParser().ParseJson(source, &stream);
+    } else {
+      GenericStringUC16CharacterStream stream(source, 0, source->length());
+      return JsonParser().ParseJson(source, &stream);
+    }
   }
 
  private:
@@ -710,7 +725,7 @@ class JsonParser BASE_EMBEDDED {
   ~JsonParser() { }
 
   // Parse a string containing a single JSON value.
-  Handle<Object> ParseJson(Handle<String>);
+  Handle<Object> ParseJson(Handle<String> script, UC16CharacterStream* source);
   // Parse a single JSON value from input (grammar production JSONValue).
   // A JSON value is either a (double-quoted) string literal, a number literal,
   // one of "true", "false", or "null", or an object or array literal.
diff --git a/deps/v8/src/platform-linux.cc b/deps/v8/src/platform-linux.cc
index 46c74b017f..7efb25de94 100644
--- a/deps/v8/src/platform-linux.cc
+++ b/deps/v8/src/platform-linux.cc
@@ -134,9 +134,7 @@ static bool CPUInfoContainsString(const char * search_string) {
 }
 
 bool OS::ArmCpuHasFeature(CpuFeature feature) {
-  const int max_items = 2;
-  const char* search_strings[max_items] = { NULL, NULL };
-  int search_items = 0;
+  const char* search_string = NULL;
   // Simple detection of VFP at runtime for Linux.
   // It is based on /proc/cpuinfo, which reveals hardware configuration
   // to user-space applications.  According to ARM (mid 2009), no similar
@@ -144,25 +142,26 @@ bool OS::ArmCpuHasFeature(CpuFeature feature) {
   // so it's up to individual OSes to provide such.
   switch (feature) {
     case VFP3:
-      search_strings[0] = "vfpv3";
-      // Some old kernels will report vfp for A8, not vfpv3, so we check for
-      // A8 explicitely. The cpuinfo file report the CPU Part which for Cortex
-      // A8 is 0xc08.
-      search_strings[1] = "0xc08";
-      search_items = 2;
-      ASSERT(search_items <= max_items);
+      search_string = "vfpv3";
       break;
     case ARMv7:
-      search_strings[0] = "ARMv7" ;
-      search_items = 1;
-      ASSERT(search_items <= max_items);
+      search_string = "ARMv7";
       break;
     default:
       UNREACHABLE();
   }
 
-  for (int i = 0; i < search_items; ++i) {
-    if (CPUInfoContainsString(search_strings[i])) {
+  if (CPUInfoContainsString(search_string)) {
+    return true;
+  }
+
+  if (feature == VFP3) {
+    // Some old kernels will report vfp not vfpv3. Here we make a last attempt
+    // to detect vfpv3 by checking for vfp *and* neon, since neon is only
+    // available on architectures with vfpv3.
+    // Checking neon on its own is not enough as it is possible to have neon
+    // without vfp.
+    if (CPUInfoContainsString("vfp") && CPUInfoContainsString("neon")) {
       return true;
     }
   }
diff --git a/deps/v8/src/preparser-api.cc b/deps/v8/src/preparser-api.cc
index f096e941b7..cbec9b7096 100644
--- a/deps/v8/src/preparser-api.cc
+++ b/deps/v8/src/preparser-api.cc
@@ -39,39 +39,121 @@ namespace v8 {
 namespace internal {
 
 // UTF16Buffer based on a v8::UnicodeInputStream.
-class InputStreamUTF16Buffer : public UTF16Buffer {
+class InputStreamUTF16Buffer : public UC16CharacterStream {
  public:
-  explicit InputStreamUTF16Buffer(UnicodeInputStream* stream)
-      : UTF16Buffer(),
-        stream_(stream) { }
+  /* The InputStreamUTF16Buffer maintains an internal buffer
+   * that is filled in chunks from the UC16CharacterStream.
+   * It also maintains unlimited pushback capability, but optimized
+   * for small pushbacks.
+   * The pushback_buffer_ pointer points to the limit of pushbacks
+   * in the current buffer. There is room for a few pushback'ed chars before
+   * the buffer containing the most recently read chunk. If this is overflowed,
+   * an external buffer is allocated/reused to hold further pushbacks, and
+   * pushback_buffer_ and buffer_cursor_/buffer_end_ now points to the
+   * new buffer. When this buffer is read to the end again, the cursor is
+   * switched back to the internal buffer
+   */
+  explicit InputStreamUTF16Buffer(v8::UnicodeInputStream* stream)
+      : UC16CharacterStream(),
+        stream_(stream),
+        pushback_buffer_(buffer_),
+        pushback_buffer_end_cache_(NULL),
+        pushback_buffer_backing_(NULL),
+        pushback_buffer_backing_size_(0) {
+    buffer_cursor_ = buffer_end_ = buffer_ + kPushBackSize;
+  }
 
-  virtual ~InputStreamUTF16Buffer() { }
+  virtual ~InputStreamUTF16Buffer() {
+    if (pushback_buffer_backing_ != NULL) {
+      DeleteArray(pushback_buffer_backing_);
+    }
+  }
 
-  virtual void PushBack(uc32 ch) {
-    stream_->PushBack(ch);
+  virtual void PushBack(uc16 ch) {
+    ASSERT(pos_ > 0);
+    if (buffer_cursor_ <= pushback_buffer_) {
+      // No more room in the current buffer to do pushbacks.
+      if (pushback_buffer_end_cache_ == NULL) {
+        // We have overflowed the pushback space at the beginning of buffer_.
+        // Switch to using a separate allocated pushback buffer.
+        if (pushback_buffer_backing_ == NULL) {
+          // Allocate a buffer the first time we need it.
+          pushback_buffer_backing_ = NewArray<uc16>(kPushBackSize);
+          pushback_buffer_backing_size_ = kPushBackSize;
+        }
+        pushback_buffer_ = pushback_buffer_backing_;
+        pushback_buffer_end_cache_ = buffer_end_;
+        buffer_end_ = pushback_buffer_backing_ + pushback_buffer_backing_size_;
+        buffer_cursor_ = buffer_end_ - 1;
+      } else {
+        // Hit the bottom of the allocated pushback buffer.
+        // Double the buffer and continue.
+        uc16* new_buffer = NewArray<uc16>(pushback_buffer_backing_size_ * 2);
+        memcpy(new_buffer + pushback_buffer_backing_size_,
+               pushback_buffer_backing_,
+               pushback_buffer_backing_size_);
+        DeleteArray(pushback_buffer_backing_);
+        buffer_cursor_ = new_buffer + pushback_buffer_backing_size_;
+        pushback_buffer_backing_ = pushback_buffer_ = new_buffer;
+        buffer_end_ = pushback_buffer_backing_ + pushback_buffer_backing_size_;
+      }
+    }
+    pushback_buffer_[buffer_cursor_ - pushback_buffer_- 1] = ch;
     pos_--;
   }
 
-  virtual uc32 Advance() {
-    uc32 result = stream_->Next();
-    if (result >= 0) pos_++;
-    return result;
+ protected:
+  virtual bool ReadBlock() {
+    if (pushback_buffer_end_cache_ != NULL) {
+      buffer_cursor_ = buffer_;
+      buffer_end_ = pushback_buffer_end_cache_;
+      pushback_buffer_end_cache_ = NULL;
+      return buffer_end_ > buffer_cursor_;
+    }
+    // Copy the top of the buffer into the pushback area.
+    int32_t value;
+    uc16* buffer_start = buffer_ + kPushBackSize;
+    buffer_cursor_ = buffer_end_ = buffer_start;
+    while ((value = stream_->Next()) >= 0) {
+      if (value > static_cast<int32_t>(unibrow::Utf8::kMaxThreeByteChar)) {
+        value = unibrow::Utf8::kBadChar;
+      }
+      // buffer_end_ is a const pointer, but buffer_ is writable.
+      buffer_start[buffer_end_++ - buffer_start] = static_cast<uc16>(value);
+      if (buffer_end_ == buffer_ + kPushBackSize + kBufferSize) break;
+    }
+    return buffer_end_ > buffer_start;
   }
 
-  virtual void SeekForward(int pos) {
+  virtual unsigned SlowSeekForward(unsigned pos) {
     // Seeking in the input is not used by preparsing.
     // It's only used by the real parser based on preparser data.
     UNIMPLEMENTED();
+    return 0;
   }
 
  private:
+  static const unsigned kBufferSize = 512;
+  static const unsigned kPushBackSize = 16;
   v8::UnicodeInputStream* const stream_;
+  // Buffer holding first kPushBackSize characters of pushback buffer,
+  // then kBufferSize chars of read-ahead.
+  // The pushback buffer is only used if pushing back characters past
+  // the start of a block.
+  uc16 buffer_[kPushBackSize + kBufferSize];
+  // Limit of pushbacks before new allocation is necessary.
+  uc16* pushback_buffer_;
+  // Only if that pushback buffer at the start of buffer_ isn't sufficient
+  // is the following used.
+  const uc16* pushback_buffer_end_cache_;
+  uc16* pushback_buffer_backing_;
+  unsigned pushback_buffer_backing_size_;
 };
 
 
 class StandAloneJavaScriptScanner : public JavaScriptScanner {
  public:
-  void Initialize(UTF16Buffer* source) {
+  void Initialize(UC16CharacterStream* source) {
     source_ = source;
     literal_flags_ = kLiteralString | kLiteralIdentifier;
     Init();
@@ -92,7 +174,6 @@ void FatalProcessOutOfMemory(const char* reason) {
 
 bool EnableSlowAsserts() { return true; }
 
-
 }  // namespace internal.
 
 
diff --git a/deps/v8/src/preparser.cc b/deps/v8/src/preparser.cc
index 03fc9dcb18..7cce685eee 100644
--- a/deps/v8/src/preparser.cc
+++ b/deps/v8/src/preparser.cc
@@ -1078,6 +1078,7 @@ PreParser::Expression PreParser::ParseFunctionLiteral(bool* ok) {
 
     Expect(i::Token::RBRACE, CHECK_OK);
 
+    // Position right after terminal '}'.
     int end_pos = scanner_->location().end_pos;
     log_->LogFunction(function_block_pos, end_pos,
                       function_scope.materialized_literal_count(),
diff --git a/deps/v8/src/profile-generator-inl.h b/deps/v8/src/profile-generator-inl.h
index 8b5c1e21cb..3df6af06f6 100644
--- a/deps/v8/src/profile-generator-inl.h
+++ b/deps/v8/src/profile-generator-inl.h
@@ -122,7 +122,7 @@ CodeEntry* ProfileGenerator::EntryForVMState(StateTag tag) {
 }
 
 
-inline uint64_t HeapEntry::id() {
+uint64_t HeapEntry::id() {
   union {
     Id stored_id;
     uint64_t returned_id;
@@ -146,6 +146,18 @@ void HeapEntriesMap::UpdateEntries(Visitor* visitor) {
   }
 }
 
+
+bool HeapSnapshotGenerator::ReportProgress(bool force) {
+  const int kProgressReportGranularity = 10000;
+  if (control_ != NULL
+      && (force || progress_counter_ % kProgressReportGranularity == 0)) {
+      return
+          control_->ReportProgressValue(progress_counter_, progress_total_) ==
+          v8::ActivityControl::kContinue;
+  }
+  return true;
+}
+
 } }  // namespace v8::internal
 
 #endif  // ENABLE_LOGGING_AND_PROFILING
diff --git a/deps/v8/src/profile-generator.cc b/deps/v8/src/profile-generator.cc
index ff4661fbc5..364f51d4f1 100644
--- a/deps/v8/src/profile-generator.cc
+++ b/deps/v8/src/profile-generator.cc
@@ -1382,86 +1382,6 @@ HeapEntry* HeapSnapshot::AddEntry(HeapEntry::Type type,
 }
 
 
-void HeapSnapshot::FillReversePostorderIndexes(Vector<HeapEntry*>* entries) {
-  ClearPaint();
-  int current_entry = 0;
-  List<HeapEntry*> nodes_to_visit;
-  nodes_to_visit.Add(root());
-  root()->paint_reachable();
-  while (!nodes_to_visit.is_empty()) {
-    HeapEntry* entry = nodes_to_visit.last();
-    Vector<HeapGraphEdge> children = entry->children();
-    bool has_new_edges = false;
-    for (int i = 0; i < children.length(); ++i) {
-      if (children[i].type() == HeapGraphEdge::kShortcut) continue;
-      HeapEntry* child = children[i].to();
-      if (!child->painted_reachable()) {
-        nodes_to_visit.Add(child);
-        child->paint_reachable();
-        has_new_edges = true;
-      }
-    }
-    if (!has_new_edges) {
-      entry->set_ordered_index(current_entry);
-      (*entries)[current_entry++] = entry;
-      nodes_to_visit.RemoveLast();
-    }
-  }
-  entries->Truncate(current_entry);
-}
-
-
-static int Intersect(int i1, int i2, const Vector<HeapEntry*>& dominators) {
-  int finger1 = i1, finger2 = i2;
-  while (finger1 != finger2) {
-    while (finger1 < finger2) finger1 = dominators[finger1]->ordered_index();
-    while (finger2 < finger1) finger2 = dominators[finger2]->ordered_index();
-  }
-  return finger1;
-}
-
-// The algorithm is based on the article:
-// K. Cooper, T. Harvey and K. Kennedy "A Simple, Fast Dominance Algorithm"
-// Softw. Pract. Exper. 4 (2001), pp. 1–10.
-void HeapSnapshot::BuildDominatorTree(const Vector<HeapEntry*>& entries,
-                                      Vector<HeapEntry*>* dominators) {
-  if (entries.length() == 0) return;
-  const int root_index = entries.length() - 1;
-  for (int i = 0; i < root_index; ++i) (*dominators)[i] = NULL;
-  (*dominators)[root_index] = entries[root_index];
-  bool changed = true;
-  while (changed) {
-    changed = false;
-    for (int i = root_index - 1; i >= 0; --i) {
-      HeapEntry* new_idom = NULL;
-      Vector<HeapGraphEdge*> rets = entries[i]->retainers();
-      int j = 0;
-      for (; j < rets.length(); ++j) {
-        if (rets[j]->type() == HeapGraphEdge::kShortcut) continue;
-        HeapEntry* ret = rets[j]->From();
-        if (dominators->at(ret->ordered_index()) != NULL) {
-          new_idom = ret;
-          break;
-        }
-      }
-      for (++j; j < rets.length(); ++j) {
-        if (rets[j]->type() == HeapGraphEdge::kShortcut) continue;
-        HeapEntry* ret = rets[j]->From();
-        if (dominators->at(ret->ordered_index()) != NULL) {
-          new_idom = entries[Intersect(ret->ordered_index(),
-                                       new_idom->ordered_index(),
-                                       *dominators)];
-        }
-      }
-      if (new_idom != NULL && dominators->at(i) != new_idom) {
-        (*dominators)[i] = new_idom;
-        changed = true;
-      }
-    }
-  }
-}
-
-
 void HeapSnapshot::SetDominatorsToSelf() {
   for (int i = 0; i < entries_.length(); ++i) {
     HeapEntry* entry = entries_[i];
@@ -1470,61 +1390,6 @@ void HeapSnapshot::SetDominatorsToSelf() {
 }
 
 
-void HeapSnapshot::SetEntriesDominators() {
-  // This array is used for maintaining reverse postorder of nodes.
-  ScopedVector<HeapEntry*> ordered_entries(entries_.length());
-  FillReversePostorderIndexes(&ordered_entries);
-  ScopedVector<HeapEntry*> dominators(ordered_entries.length());
-  BuildDominatorTree(ordered_entries, &dominators);
-  for (int i = 0; i < ordered_entries.length(); ++i) {
-    ASSERT(dominators[i] != NULL);
-    ordered_entries[i]->set_dominator(dominators[i]);
-  }
-  // For nodes unreachable from root, set dominator to itself.
-  SetDominatorsToSelf();
-}
-
-
-void HeapSnapshot::ApproximateRetainedSizes() {
-  SetEntriesDominators();
-  // As for the dominators tree we only know parent nodes, not
-  // children, to sum up total sizes we traverse the tree level by
-  // level upwards, starting from leaves.
-  for (int i = 0; i < entries_.length(); ++i) {
-    HeapEntry* entry = entries_[i];
-    entry->set_retained_size(entry->self_size());
-    entry->set_leaf();
-  }
-  while (true) {
-    bool onlyLeaves = true;
-    for (int i = 0; i < entries_.length(); ++i) {
-      HeapEntry *entry = entries_[i], *dominator = entry->dominator();
-      if (!entry->is_processed() && dominator != entry) {
-        dominator->set_non_leaf();
-        onlyLeaves = false;
-      }
-    }
-    if (onlyLeaves) break;
-
-    for (int i = 0; i < entries_.length(); ++i) {
-      HeapEntry *entry = entries_[i], *dominator = entry->dominator();
-      if (entry->is_leaf() && dominator != entry) {
-        dominator->add_retained_size(entry->retained_size());
-      }
-    }
-
-    // Mark all current leaves as processed, reset non-leaves back to leaves.
-    for (int i = 0; i < entries_.length(); ++i) {
-      HeapEntry* entry = entries_[i];
-      if (entry->is_leaf())
-        entry->set_processed();
-      else if (entry->is_non_leaf())
-        entry->set_leaf();
-    }
-  }
-}
-
-
 HeapEntry* HeapSnapshot::GetNextEntryToInit() {
   if (entries_.length() > 0) {
     HeapEntry* last_entry = entries_.last();
@@ -1716,15 +1581,22 @@ HeapSnapshot* HeapSnapshotsCollection::NewSnapshot(HeapSnapshot::Type type,
                                                    const char* name,
                                                    unsigned uid) {
   is_tracking_objects_ = true;  // Start watching for heap objects moves.
-  HeapSnapshot* snapshot = new HeapSnapshot(this, type, name, uid);
-  snapshots_.Add(snapshot);
-  HashMap::Entry* entry =
-      snapshots_uids_.Lookup(reinterpret_cast<void*>(snapshot->uid()),
-                             static_cast<uint32_t>(snapshot->uid()),
-                             true);
-  ASSERT(entry->value == NULL);
-  entry->value = snapshot;
-  return snapshot;
+  return new HeapSnapshot(this, type, name, uid);
+}
+
+
+void HeapSnapshotsCollection::SnapshotGenerationFinished(
+    HeapSnapshot* snapshot) {
+  ids_.SnapshotGenerationFinished();
+  if (snapshot != NULL) {
+    snapshots_.Add(snapshot);
+    HashMap::Entry* entry =
+        snapshots_uids_.Lookup(reinterpret_cast<void*>(snapshot->uid()),
+                               static_cast<uint32_t>(snapshot->uid()),
+                               true);
+    ASSERT(entry->value == NULL);
+    entry->value = snapshot;
+  }
 }
 
 
@@ -1832,8 +1704,10 @@ void HeapObjectsSet::Insert(Object* obj) {
 }
 
 
-HeapSnapshotGenerator::HeapSnapshotGenerator(HeapSnapshot* snapshot)
+HeapSnapshotGenerator::HeapSnapshotGenerator(HeapSnapshot* snapshot,
+                                             v8::ActivityControl* control)
     : snapshot_(snapshot),
+      control_(control),
       collection_(snapshot->collection()),
       filler_(NULL) {
 }
@@ -1990,21 +1864,13 @@ class RootsReferencesExtractor : public ObjectVisitor {
 };
 
 
-void HeapSnapshotGenerator::GenerateSnapshot() {
+bool HeapSnapshotGenerator::GenerateSnapshot() {
   AssertNoAllocation no_alloc;
 
+  SetProgressTotal(4);  // 2 passes + dominators + sizes.
+
   // Pass 1. Iterate heap contents to count entries and references.
-  SnapshotCounter counter(&entries_);
-  filler_ = &counter;
-  filler_->AddEntry(HeapSnapshot::kInternalRootObject);
-  filler_->AddEntry(HeapSnapshot::kGcRootsObject);
-  HeapIterator iterator(HeapIterator::kPreciseFiltering);
-  for (HeapObject* obj = iterator.next(); obj != NULL; obj = iterator.next()) {
-    ExtractReferences(obj);
-  }
-  SetRootGcRootsReference();
-  RootsReferencesExtractor extractor(this);
-  Heap::IterateRoots(&extractor, VISIT_ONLY_STRONG);
+  if (!CountEntriesAndReferences()) return false;
 
   // Allocate and fill entries in the snapshot, allocate references.
   snapshot_->AllocateEntries(entries_.entries_count(),
@@ -2014,16 +1880,14 @@ void HeapSnapshotGenerator::GenerateSnapshot() {
   entries_.UpdateEntries(&allocator);
 
   // Pass 2. Fill references.
-  SnapshotFiller filler(snapshot_, &entries_);
-  filler_ = &filler;
-  iterator.reset();
-  for (HeapObject* obj = iterator.next(); obj != NULL; obj = iterator.next()) {
-    ExtractReferences(obj);
-  }
-  SetRootGcRootsReference();
-  Heap::IterateRoots(&extractor, VISIT_ONLY_STRONG);
+  if (!FillReferences()) return false;
+
+  if (!SetEntriesDominators()) return false;
+  if (!ApproximateRetainedSizes()) return false;
 
-  snapshot_->ApproximateRetainedSizes();
+  progress_counter_ = progress_total_;
+  if (!ReportProgress(true)) return false;
+  return true;
 }
 
 
@@ -2351,6 +2215,183 @@ void HeapSnapshotGenerator::SetGcRootsReference(Object* child_obj) {
 }
 
 
+void HeapSnapshotGenerator::SetProgressTotal(int iterations_count) {
+  if (control_ == NULL) return;
+
+  HeapIterator iterator(HeapIterator::kPreciseFiltering);
+  int objects_count = 0;
+  for (HeapObject* obj = iterator.next();
+       obj != NULL;
+       obj = iterator.next(), ++objects_count) {}
+  progress_total_ = objects_count * iterations_count;
+  progress_counter_ = 0;
+}
+
+
+bool HeapSnapshotGenerator::CountEntriesAndReferences() {
+  SnapshotCounter counter(&entries_);
+  filler_ = &counter;
+  filler_->AddEntry(HeapSnapshot::kInternalRootObject);
+  filler_->AddEntry(HeapSnapshot::kGcRootsObject);
+  return IterateAndExtractReferences();
+}
+
+
+bool HeapSnapshotGenerator::FillReferences() {
+  SnapshotFiller filler(snapshot_, &entries_);
+  filler_ = &filler;
+  return IterateAndExtractReferences();
+}
+
+
+void HeapSnapshotGenerator::FillReversePostorderIndexes(
+    Vector<HeapEntry*>* entries) {
+  snapshot_->ClearPaint();
+  int current_entry = 0;
+  List<HeapEntry*> nodes_to_visit;
+  nodes_to_visit.Add(snapshot_->root());
+  snapshot_->root()->paint_reachable();
+  while (!nodes_to_visit.is_empty()) {
+    HeapEntry* entry = nodes_to_visit.last();
+    Vector<HeapGraphEdge> children = entry->children();
+    bool has_new_edges = false;
+    for (int i = 0; i < children.length(); ++i) {
+      if (children[i].type() == HeapGraphEdge::kShortcut) continue;
+      HeapEntry* child = children[i].to();
+      if (!child->painted_reachable()) {
+        nodes_to_visit.Add(child);
+        child->paint_reachable();
+        has_new_edges = true;
+      }
+    }
+    if (!has_new_edges) {
+      entry->set_ordered_index(current_entry);
+      (*entries)[current_entry++] = entry;
+      nodes_to_visit.RemoveLast();
+    }
+  }
+  entries->Truncate(current_entry);
+}
+
+
+static int Intersect(int i1, int i2, const Vector<HeapEntry*>& dominators) {
+  int finger1 = i1, finger2 = i2;
+  while (finger1 != finger2) {
+    while (finger1 < finger2) finger1 = dominators[finger1]->ordered_index();
+    while (finger2 < finger1) finger2 = dominators[finger2]->ordered_index();
+  }
+  return finger1;
+}
+
+// The algorithm is based on the article:
+// K. Cooper, T. Harvey and K. Kennedy "A Simple, Fast Dominance Algorithm"
+// Softw. Pract. Exper. 4 (2001), pp. 1–10.
+bool HeapSnapshotGenerator::BuildDominatorTree(
+    const Vector<HeapEntry*>& entries,
+    Vector<HeapEntry*>* dominators) {
+  if (entries.length() == 0) return true;
+  const int entries_length = entries.length(), root_index = entries_length - 1;
+  for (int i = 0; i < root_index; ++i) (*dominators)[i] = NULL;
+  (*dominators)[root_index] = entries[root_index];
+  int changed = 1;
+  const int base_progress_counter = progress_counter_;
+  while (changed != 0) {
+    changed = 0;
+    for (int i = root_index - 1; i >= 0; --i) {
+      HeapEntry* new_idom = NULL;
+      Vector<HeapGraphEdge*> rets = entries[i]->retainers();
+      int j = 0;
+      for (; j < rets.length(); ++j) {
+        if (rets[j]->type() == HeapGraphEdge::kShortcut) continue;
+        HeapEntry* ret = rets[j]->From();
+        if (dominators->at(ret->ordered_index()) != NULL) {
+          new_idom = ret;
+          break;
+        }
+      }
+      for (++j; j < rets.length(); ++j) {
+        if (rets[j]->type() == HeapGraphEdge::kShortcut) continue;
+        HeapEntry* ret = rets[j]->From();
+        if (dominators->at(ret->ordered_index()) != NULL) {
+          new_idom = entries[Intersect(ret->ordered_index(),
+                                       new_idom->ordered_index(),
+                                       *dominators)];
+        }
+      }
+      if (new_idom != NULL && dominators->at(i) != new_idom) {
+        (*dominators)[i] = new_idom;
+        ++changed;
+      }
+    }
+    int remaining = entries_length - changed;
+    if (remaining < 0) remaining = 0;
+    progress_counter_ = base_progress_counter + remaining;
+    if (!ReportProgress(true)) return false;
+  }
+  return true;
+}
+
+
+bool HeapSnapshotGenerator::SetEntriesDominators() {
+  // This array is used for maintaining reverse postorder of nodes.
+  ScopedVector<HeapEntry*> ordered_entries(snapshot_->entries()->length());
+  FillReversePostorderIndexes(&ordered_entries);
+  ScopedVector<HeapEntry*> dominators(ordered_entries.length());
+  if (!BuildDominatorTree(ordered_entries, &dominators)) return false;
+  for (int i = 0; i < ordered_entries.length(); ++i) {
+    ASSERT(dominators[i] != NULL);
+    ordered_entries[i]->set_dominator(dominators[i]);
+  }
+  // For nodes unreachable from root, set dominator to itself.
+  snapshot_->SetDominatorsToSelf();
+  return true;
+}
+
+
+bool HeapSnapshotGenerator::ApproximateRetainedSizes() {
+  // As for the dominators tree we only know parent nodes, not
+  // children, to sum up total sizes we "bubble" node's self size
+  // adding it to all of its parents.
+  for (int i = 0; i < snapshot_->entries()->length(); ++i) {
+    HeapEntry* entry = snapshot_->entries()->at(i);
+    entry->set_retained_size(entry->self_size());
+  }
+  for (int i = 0;
+       i < snapshot_->entries()->length();
+       ++i, IncProgressCounter()) {
+    HeapEntry* entry = snapshot_->entries()->at(i);
+    int entry_size = entry->self_size();
+    for (HeapEntry* dominator = entry->dominator();
+         dominator != entry;
+         entry = dominator, dominator = entry->dominator()) {
+      dominator->add_retained_size(entry_size);
+    }
+    if (!ReportProgress()) return false;
+  }
+  return true;
+}
+
+
+bool HeapSnapshotGenerator::IterateAndExtractReferences() {
+  HeapIterator iterator(HeapIterator::kPreciseFiltering);
+  bool interrupted = false;
+  // Heap iteration with precise filtering must be finished in any case.
+  for (HeapObject* obj = iterator.next();
+       obj != NULL;
+       obj = iterator.next(), IncProgressCounter()) {
+    if (!interrupted) {
+      ExtractReferences(obj);
+      if (!ReportProgress()) interrupted = true;
+    }
+  }
+  if (interrupted) return false;
+  SetRootGcRootsReference();
+  RootsReferencesExtractor extractor(this);
+  Heap::IterateRoots(&extractor, VISIT_ONLY_STRONG);
+  return ReportProgress();
+}
+
+
 void HeapSnapshotsDiff::CreateRoots(int additions_count, int deletions_count) {
   raw_additions_root_ =
       NewArray<char>(HeapEntry::EntriesSize(1, additions_count, 0));
diff --git a/deps/v8/src/profile-generator.h b/deps/v8/src/profile-generator.h
index 16764a214a..cacd27eaab 100644
--- a/deps/v8/src/profile-generator.h
+++ b/deps/v8/src/profile-generator.h
@@ -526,7 +526,7 @@ class HeapEntry BASE_EMBEDDED {
   HeapSnapshot* snapshot() { return snapshot_; }
   Type type() { return static_cast<Type>(type_); }
   const char* name() { return name_; }
-  uint64_t id();
+  inline uint64_t id();
   int self_size() { return self_size_; }
   int retained_size() { return retained_size_; }
   void add_retained_size(int size) { retained_size_ += size; }
@@ -558,13 +558,6 @@ class HeapEntry BASE_EMBEDDED {
   void ApplyAndPaintAllReachable(Visitor* visitor);
   void PaintAllReachable();
 
-  bool is_leaf() { return painted_ == kLeaf; }
-  void set_leaf() { painted_ = kLeaf; }
-  bool is_non_leaf() { return painted_ == kNonLeaf; }
-  void set_non_leaf() { painted_ = kNonLeaf; }
-  bool is_processed() { return painted_ == kProcessed; }
-  void set_processed() { painted_ = kProcessed; }
-
   void SetIndexedReference(HeapGraphEdge::Type type,
                            int child_index,
                            int index,
@@ -625,10 +618,6 @@ class HeapEntry BASE_EMBEDDED {
   static const unsigned kUnpainted = 0;
   static const unsigned kPainted = 1;
   static const unsigned kPaintedReachableFromOthers = 2;
-  // Paints used for approximate retained sizes calculation.
-  static const unsigned kLeaf = 0;
-  static const unsigned kNonLeaf = 1;
-  static const unsigned kProcessed = 2;
 
   static const int kExactRetainedSizeTag = 1;
 
@@ -682,6 +671,7 @@ class HeapSnapshot {
   unsigned uid() { return uid_; }
   HeapEntry* root() { return root_entry_; }
   HeapEntry* gc_roots() { return gc_roots_entry_; }
+  List<HeapEntry*>* entries() { return &entries_; }
 
   void AllocateEntries(
       int entries_count, int children_count, int retainers_count);
@@ -693,7 +683,6 @@ class HeapSnapshot {
                       int size,
                       int children_count,
                       int retainers_count);
-  void ApproximateRetainedSizes();
   void ClearPaint();
   HeapSnapshotsDiff* CompareWith(HeapSnapshot* snapshot);
   HeapEntry* GetEntryById(uint64_t id);
@@ -716,10 +705,6 @@ class HeapSnapshot {
                       int children_count,
                       int retainers_count);
   HeapEntry* GetNextEntryToInit();
-  void BuildDominatorTree(const Vector<HeapEntry*>& entries,
-                          Vector<HeapEntry*>* dominators);
-  void FillReversePostorderIndexes(Vector<HeapEntry*>* entries);
-  void SetEntriesDominators();
 
   HeapSnapshotsCollection* collection_;
   Type type_;
@@ -845,7 +830,7 @@ class HeapSnapshotsCollection {
 
   HeapSnapshot* NewSnapshot(
       HeapSnapshot::Type type, const char* name, unsigned uid);
-  void SnapshotGenerationFinished() { ids_.SnapshotGenerationFinished(); }
+  void SnapshotGenerationFinished(HeapSnapshot* snapshot);
   List<HeapSnapshot*>* snapshots() { return &snapshots_; }
   HeapSnapshot* GetSnapshot(unsigned uid);
 
@@ -968,16 +953,27 @@ class HeapSnapshotGenerator {
                                         HeapEntry* child_entry) = 0;
   };
 
-  explicit HeapSnapshotGenerator(HeapSnapshot* snapshot);
-  void GenerateSnapshot();
+  HeapSnapshotGenerator(HeapSnapshot* snapshot,
+                        v8::ActivityControl* control);
+  bool GenerateSnapshot();
 
  private:
+  bool ApproximateRetainedSizes();
+  bool BuildDominatorTree(const Vector<HeapEntry*>& entries,
+                          Vector<HeapEntry*>* dominators);
+  bool CountEntriesAndReferences();
   HeapEntry* GetEntry(Object* obj);
+  void IncProgressCounter() { ++progress_counter_; }
   void ExtractReferences(HeapObject* obj);
   void ExtractClosureReferences(JSObject* js_obj, HeapEntry* entry);
   void ExtractPropertyReferences(JSObject* js_obj, HeapEntry* entry);
   void ExtractElementReferences(JSObject* js_obj, HeapEntry* entry);
   void ExtractInternalReferences(JSObject* js_obj, HeapEntry* entry);
+  bool FillReferences();
+  void FillReversePostorderIndexes(Vector<HeapEntry*>* entries);
+  bool IterateAndExtractReferences();
+  inline bool ReportProgress(bool force = false);
+  bool SetEntriesDominators();
   void SetClosureReference(HeapObject* parent_obj,
                            HeapEntry* parent,
                            String* reference_name,
@@ -1009,8 +1005,10 @@ class HeapSnapshotGenerator {
   void SetRootShortcutReference(Object* child);
   void SetRootGcRootsReference();
   void SetGcRootsReference(Object* child);
+  void SetProgressTotal(int iterations_count);
 
   HeapSnapshot* snapshot_;
+  v8::ActivityControl* control_;
   HeapSnapshotsCollection* collection_;
   // Mapping from HeapObject* pointers to HeapEntry* pointers.
   HeapEntriesMap entries_;
@@ -1018,6 +1016,9 @@ class HeapSnapshotGenerator {
   // Used during references extraction to mark heap objects that
   // are references via non-hidden properties.
   HeapObjectsSet known_references_;
+  // Used during snapshot generation.
+  int progress_counter_;
+  int progress_total_;
 
   friend class IndexedReferencesExtractor;
   friend class RootsReferencesExtractor;
diff --git a/deps/v8/src/regexp.js b/deps/v8/src/regexp.js
index d01d04f2e3..dd27266a94 100644
--- a/deps/v8/src/regexp.js
+++ b/deps/v8/src/regexp.js
@@ -120,22 +120,28 @@ function DoRegExpExec(regexp, string, index) {
 
 function BuildResultFromMatchInfo(lastMatchInfo, s) {
   var numResults = NUMBER_OF_CAPTURES(lastMatchInfo) >> 1;
-  var result = %_RegExpConstructResult(numResults, lastMatchInfo[CAPTURE0], s);
-  if (numResults === 1) {
-    var matchStart = lastMatchInfo[CAPTURE(0)];
-    var matchEnd = lastMatchInfo[CAPTURE(1)];
-    result[0] = SubString(s, matchStart, matchEnd);
+  var start = lastMatchInfo[CAPTURE0];
+  var end = lastMatchInfo[CAPTURE1];
+  var result = %_RegExpConstructResult(numResults, start, s);
+  if (start + 1 == end) {
+    result[0] = %_StringCharAt(s, start);
   } else {
-    for (var i = 0; i < numResults; i++) {
-      var matchStart = lastMatchInfo[CAPTURE(i << 1)];
-      var matchEnd = lastMatchInfo[CAPTURE((i << 1) + 1)];
-      if (matchStart != -1 && matchEnd != -1) {
-        result[i] = SubString(s, matchStart, matchEnd);
+    result[0] = %_SubString(s, start, end);
+  }
+  var j = REGEXP_FIRST_CAPTURE + 2;
+  for (var i = 1; i < numResults; i++) {
+    start = lastMatchInfo[j++];
+    end = lastMatchInfo[j++];
+    if (end != -1) {
+      if (start + 1 == end) {
+        result[i] = %_StringCharAt(s, start);
       } else {
-        // Make sure the element is present. Avoid reading the undefined
-        // property from the global object since this may change.
-        result[i] = void 0;
+        result[i] = %_SubString(s, start, end);
       }
+    } else {
+      // Make sure the element is present. Avoid reading the undefined
+      // property from the global object since this may change.
+      result[i] = void 0;
     }
   }
   return result;
@@ -166,12 +172,7 @@ function RegExpExec(string) {
     }
     string = regExpInput;
   }
-  var s;
-  if (IS_STRING(string)) {
-    s = string;
-  } else {
-    s = ToString(string);
-  }
+  string = TO_STRING_INLINE(string);
   var lastIndex = this.lastIndex;
 
   // Conversion is required by the ES5 specification (RegExp.prototype.exec
@@ -180,7 +181,7 @@ function RegExpExec(string) {
 
   var global = this.global;
   if (global) {
-    if (i < 0 || i > s.length) {
+    if (i < 0 || i > string.length) {
       this.lastIndex = 0;
       return null;
     }
@@ -188,9 +189,9 @@ function RegExpExec(string) {
     i = 0;
   }
 
-  %_Log('regexp', 'regexp-exec,%0r,%1S,%2i', [this, s, lastIndex]);
+  %_Log('regexp', 'regexp-exec,%0r,%1S,%2i', [this, string, lastIndex]);
   // matchIndices is either null or the lastMatchInfo array.
-  var matchIndices = %_RegExpExec(this, s, i, lastMatchInfo);
+  var matchIndices = %_RegExpExec(this, string, i, lastMatchInfo);
 
   if (matchIndices === null) {
     if (global) this.lastIndex = 0;
@@ -202,7 +203,7 @@ function RegExpExec(string) {
   if (global) {
     this.lastIndex = lastMatchInfo[CAPTURE1];
   }
-  return BuildResultFromMatchInfo(matchIndices, s);
+  return BuildResultFromMatchInfo(matchIndices, string);
 }
 
 
@@ -227,12 +228,7 @@ function RegExpTest(string) {
     string = regExpInput;
   }
 
-  var s;
-  if (IS_STRING(string)) {
-    s = string;
-  } else {
-    s = ToString(string);
-  }
+  string = TO_STRING_INLINE(string);
 
   var lastIndex = this.lastIndex;
 
@@ -241,13 +237,13 @@ function RegExpTest(string) {
   var i = TO_INTEGER(lastIndex);
   
   if (this.global) {
-    if (i < 0 || i > s.length) {
+    if (i < 0 || i > string.length) {
       this.lastIndex = 0;
       return false;
     }
-    %_Log('regexp', 'regexp-exec,%0r,%1S,%2i', [this, s, lastIndex]);
+    %_Log('regexp', 'regexp-exec,%0r,%1S,%2i', [this, string, lastIndex]);
     // matchIndices is either null or the lastMatchInfo array.
-    var matchIndices = %_RegExpExec(this, s, i, lastMatchInfo);
+    var matchIndices = %_RegExpExec(this, string, i, lastMatchInfo);
     if (matchIndices === null) {
       this.lastIndex = 0;
       return false;
@@ -269,11 +265,11 @@ function RegExpTest(string) {
                                  (this.ignoreCase ? 'i' : '')
                                  + (this.multiline ? 'm' : ''));
       }
-      if (!regexp_val.test(s)) return false;
+      if (!regexp_val.test(string)) return false;
     }    
-    %_Log('regexp', 'regexp-exec,%0r,%1S,%2i', [this, s, lastIndex]);
+    %_Log('regexp', 'regexp-exec,%0r,%1S,%2i', [this, string, lastIndex]);
     // matchIndices is either null or the lastMatchInfo array.
-    var matchIndices = %_RegExpExec(this, s, 0, lastMatchInfo);
+    var matchIndices = %_RegExpExec(this, string, 0, lastMatchInfo);
     if (matchIndices === null) return false;
     lastMatchInfoOverride = null;
     return true;
diff --git a/deps/v8/src/runtime-profiler.cc b/deps/v8/src/runtime-profiler.cc
index 051dc51193..3c0490f8de 100644
--- a/deps/v8/src/runtime-profiler.cc
+++ b/deps/v8/src/runtime-profiler.cc
@@ -68,12 +68,18 @@ class PendingListNode : public Malloced {
 };
 
 
+enum SamplerState {
+  IN_NON_JS_STATE = 0,
+  IN_JS_STATE = 1
+};
+
+
 // Optimization sampler constants.
 static const int kSamplerFrameCount = 2;
 static const int kSamplerFrameWeight[kSamplerFrameCount] = { 2, 1 };
 static const int kSamplerWindowSize = 16;
 
-static const int kSamplerTicksDelta = 32;
+static const int kSamplerTicksBetweenThresholdAdjustment = 32;
 
 static const int kSamplerThresholdInit = 3;
 static const int kSamplerThresholdMin = 1;
@@ -88,6 +94,11 @@ static const int kSizeLimit = 1500;
 static int sampler_threshold = kSamplerThresholdInit;
 static int sampler_threshold_size_factor = kSamplerThresholdSizeFactorInit;
 
+static int sampler_ticks_until_threshold_adjustment =
+    kSamplerTicksBetweenThresholdAdjustment;
+
+// The ratio of ticks spent in JS code in percent.
+static Atomic32 js_ratio;
 
 // The JSFunctions in the sampler window are not GC safe. Old-space
 // pointers are not cleared during mark-sweep collection and therefore
@@ -261,40 +272,71 @@ void RuntimeProfiler::OptimizeNow() {
   // have a sample of the function, we mark it for optimizations
   // (eagerly or lazily).
   JSFunction* samples[kSamplerFrameCount];
-  int count = 0;
+  int sample_count = 0;
+  int frame_count = 0;
   for (JavaScriptFrameIterator it;
-       count < kSamplerFrameCount && !it.done();
+       frame_count++ < kSamplerFrameCount && !it.done();
        it.Advance()) {
     JavaScriptFrame* frame = it.frame();
     JSFunction* function = JSFunction::cast(frame->function());
-    int function_size = function->shared()->SourceSize();
-    int threshold_size_factor;
-    if (function_size > kSizeLimit) {
-      threshold_size_factor = sampler_threshold_size_factor;
-    } else {
-      threshold_size_factor = 1;
+
+    // Adjust threshold each time we have processed
+    // a certain number of ticks.
+    if (sampler_ticks_until_threshold_adjustment > 0) {
+      sampler_ticks_until_threshold_adjustment--;
+      if (sampler_ticks_until_threshold_adjustment <= 0) {
+        // If the threshold is not already at the minimum
+        // modify and reset the ticks until next adjustment.
+        if (sampler_threshold > kSamplerThresholdMin) {
+          sampler_threshold -= kSamplerThresholdDelta;
+          sampler_ticks_until_threshold_adjustment =
+              kSamplerTicksBetweenThresholdAdjustment;
+        }
+      }
     }
 
-    int threshold = sampler_threshold * threshold_size_factor;
-    samples[count++] = function;
     if (function->IsMarkedForLazyRecompilation()) {
       Code* unoptimized = function->shared()->code();
       int nesting = unoptimized->allow_osr_at_loop_nesting_level();
       if (nesting == 0) AttemptOnStackReplacement(function);
       int new_nesting = Min(nesting + 1, Code::kMaxLoopNestingMarker);
       unoptimized->set_allow_osr_at_loop_nesting_level(new_nesting);
-    } else if (LookupSample(function) >= threshold) {
-      if (IsOptimizable(function)) {
-        Optimize(function, false, 0);
-        CompilationCache::MarkForEagerOptimizing(Handle<JSFunction>(function));
-      }
+    }
+
+    // Do not record non-optimizable functions.
+    if (!IsOptimizable(function)) continue;
+    samples[sample_count++] = function;
+
+    int function_size = function->shared()->SourceSize();
+    int threshold_size_factor = (function_size > kSizeLimit)
+        ? sampler_threshold_size_factor
+        : 1;
+
+    int threshold = sampler_threshold * threshold_size_factor;
+    int current_js_ratio = NoBarrier_Load(&js_ratio);
+
+    // Adjust threshold depending on the ratio of time spent
+    // in JS code.
+    if (current_js_ratio < 20) {
+      // If we spend less than 20% of the time in JS code,
+      // do not optimize.
+      continue;
+    } else if (current_js_ratio < 75) {
+      // Below 75% of time spent in JS code, only optimize very
+      // frequently used functions.
+      threshold *= 3;
+    }
+
+    if (LookupSample(function) >= threshold) {
+      Optimize(function, false, 0);
+      CompilationCache::MarkForEagerOptimizing(Handle<JSFunction>(function));
     }
   }
 
   // Add the collected functions as samples. It's important not to do
   // this as part of collecting them because this will interfere with
   // the sample lookup in case of recursive functions.
-  for (int i = 0; i < count; i++) {
+  for (int i = 0; i < sample_count; i++) {
     AddSample(samples[i], kSamplerFrameWeight[i]);
   }
 }
@@ -308,7 +350,30 @@ void RuntimeProfiler::OptimizeSoon(JSFunction* function) {
 }
 
 
+static void UpdateStateRatio(SamplerState current_state) {
+  static const int kStateWindowSize = 128;
+  static SamplerState state_window[kStateWindowSize];
+  static int state_window_position = 0;
+  static int state_counts[2] = { kStateWindowSize, 0 };
+
+  SamplerState old_state = state_window[state_window_position];
+  state_counts[old_state]--;
+  state_window[state_window_position] = current_state;
+  state_counts[current_state]++;
+  ASSERT(IsPowerOf2(kStateWindowSize));
+  state_window_position = (state_window_position + 1) &
+      (kStateWindowSize - 1);
+  NoBarrier_Store(&js_ratio, state_counts[IN_JS_STATE] * 100 /
+                  kStateWindowSize);
+}
+
+
 void RuntimeProfiler::NotifyTick() {
+  // Record state sample.
+  SamplerState state = Top::IsInJSState()
+      ? IN_JS_STATE
+      : IN_NON_JS_STATE;
+  UpdateStateRatio(state);
   StackGuard::RequestRuntimeProfilerTick();
 }
 
@@ -341,6 +406,8 @@ void RuntimeProfiler::Setup() {
 
 void RuntimeProfiler::Reset() {
   sampler_threshold = kSamplerThresholdInit;
+  sampler_ticks_until_threshold_adjustment =
+      kSamplerTicksBetweenThresholdAdjustment;
   sampler_threshold_size_factor = kSamplerThresholdSizeFactorInit;
 }
 
diff --git a/deps/v8/src/runtime.cc b/deps/v8/src/runtime.cc
index add3ad92ea..bd4b89077c 100644
--- a/deps/v8/src/runtime.cc
+++ b/deps/v8/src/runtime.cc
@@ -4689,6 +4689,13 @@ static MaybeObject* QuoteJsonString(Vector<const Char> characters) {
   if (!new_alloc->ToObject(&new_object)) {
     return new_alloc;
   }
+  if (!Heap::new_space()->Contains(new_object)) {
+    // Even if our string is small enough to fit in new space we still have to
+    // handle it being allocated in old space as may happen in the third
+    // attempt.  See CALL_AND_RETRY in heap-inl.h and similar code in
+    // CEntryStub::GenerateCore.
+    return SlowQuoteJsonString<Char, StringType>(characters);
+  }
   StringType* new_string = StringType::cast(new_object);
   ASSERT(Heap::new_space()->Contains(new_string));
 
@@ -4723,9 +4730,9 @@ static MaybeObject* QuoteJsonString(Vector<const Char> characters) {
   }
   *(write_cursor++) = '"';
 
-  int final_length =
+  int final_length = static_cast<int>(
       write_cursor - reinterpret_cast<Char*>(
-          new_string->address() + SeqAsciiString::kHeaderSize);
+          new_string->address() + SeqAsciiString::kHeaderSize));
   Heap::new_space()->ShrinkStringAtAllocationBoundary<StringType>(new_string,
                                                                   final_length);
   return new_string;
@@ -6022,37 +6029,6 @@ static MaybeObject* Runtime_Math_log(Arguments args) {
 }
 
 
-// Helper function to compute x^y, where y is known to be an
-// integer. Uses binary decomposition to limit the number of
-// multiplications; see the discussion in "Hacker's Delight" by Henry
-// S. Warren, Jr., figure 11-6, page 213.
-static double powi(double x, int y) {
-  ASSERT(y != kMinInt);
-  unsigned n = (y < 0) ? -y : y;
-  double m = x;
-  double p = 1;
-  while (true) {
-    if ((n & 1) != 0) p *= m;
-    n >>= 1;
-    if (n == 0) {
-      if (y < 0) {
-        // Unfortunately, we have to be careful when p has reached
-        // infinity in the computation, because sometimes the higher
-        // internal precision in the pow() implementation would have
-        // given us a finite p. This happens very rarely.
-        double result = 1.0 / p;
-        return (result == 0 && isinf(p))
-            ? pow(x, static_cast<double>(y))  // Avoid pow(double, int).
-            : result;
-      } else {
-        return p;
-      }
-    }
-    m *= m;
-  }
-}
-
-
 static MaybeObject* Runtime_Math_pow(Arguments args) {
   NoHandleAllocation ha;
   ASSERT(args.length() == 2);
@@ -6064,31 +6040,11 @@ static MaybeObject* Runtime_Math_pow(Arguments args) {
   // custom powi() function than the generic pow().
   if (args[1]->IsSmi()) {
     int y = Smi::cast(args[1])->value();
-    return Heap::NumberFromDouble(powi(x, y));
+    return Heap::NumberFromDouble(power_double_int(x, y));
   }
 
   CONVERT_DOUBLE_CHECKED(y, args[1]);
-
-  if (!isinf(x)) {
-    if (y == 0.5) {
-      // It's not uncommon to use Math.pow(x, 0.5) to compute the
-      // square root of a number. To speed up such computations, we
-      // explictly check for this case and use the sqrt() function
-      // which is faster than pow().
-      return Heap::AllocateHeapNumber(sqrt(x));
-    } else if (y == -0.5) {
-      // Optimized using Math.pow(x, -0.5) == 1 / Math.pow(x, 0.5).
-      return Heap::AllocateHeapNumber(1.0 / sqrt(x));
-    }
-  }
-
-  if (y == 0) {
-    return Smi::FromInt(1);
-  } else if (isnan(y) || ((x == 1 || x == -1) && isinf(y))) {
-    return Heap::nan_value();
-  } else {
-    return Heap::AllocateHeapNumber(pow(x, y));
-  }
+  return Heap::AllocateHeapNumber(power_double_double(x, y));
 }
 
 // Fast version of Math.pow if we know that y is not an integer and
@@ -6099,11 +6055,11 @@ static MaybeObject* Runtime_Math_pow_cfunction(Arguments args) {
   CONVERT_DOUBLE_CHECKED(x, args[0]);
   CONVERT_DOUBLE_CHECKED(y, args[1]);
   if (y == 0) {
-      return Smi::FromInt(1);
+    return Smi::FromInt(1);
   } else if (isnan(y) || ((x == 1 || x == -1) && isinf(y))) {
-      return Heap::nan_value();
+    return Heap::nan_value();
   } else {
-      return Heap::AllocateHeapNumber(pow(x, y));
+    return Heap::AllocateHeapNumber(pow(x, y));
   }
 }
 
@@ -7716,13 +7672,13 @@ static MaybeObject* Runtime_AllocateInNewSpace(Arguments args) {
 }
 
 
-// Push an array unto an array of arrays if it is not already in the
+// Push an object unto an array of objects if it is not already in the
 // array.  Returns true if the element was pushed on the stack and
 // false otherwise.
 static MaybeObject* Runtime_PushIfAbsent(Arguments args) {
   ASSERT(args.length() == 2);
   CONVERT_CHECKED(JSArray, array, args[0]);
-  CONVERT_CHECKED(JSArray, element, args[1]);
+  CONVERT_CHECKED(JSObject, element, args[1]);
   RUNTIME_ASSERT(array->HasFastElements());
   int length = Smi::cast(array->length())->value();
   FixedArray* elements = FixedArray::cast(array->elements());
diff --git a/deps/v8/src/scanner-base.cc b/deps/v8/src/scanner-base.cc
index 9e58c4e637..b26fee01a7 100644
--- a/deps/v8/src/scanner-base.cc
+++ b/deps/v8/src/scanner-base.cc
@@ -34,12 +34,6 @@
 namespace v8 {
 namespace internal {
 
-// ----------------------------------------------------------------------------
-// UTF16Buffer
-
-UTF16Buffer::UTF16Buffer()
-    : pos_(0), end_(kNoEndPosition) { }
-
 // ----------------------------------------------------------------------------
 // LiteralCollector
 
@@ -92,7 +86,7 @@ bool ScannerConstants::IsIdentifier(unibrow::CharacterStream* buffer) {
 // ----------------------------------------------------------------------------
 // Scanner
 
-Scanner::Scanner() : source_(NULL) {}
+Scanner::Scanner() { }
 
 
 uc32 Scanner::ScanHexEscape(uc32 c, int length) {
@@ -142,8 +136,7 @@ uc32 Scanner::ScanOctalEscape(uc32 c, int length) {
 // ----------------------------------------------------------------------------
 // JavaScriptScanner
 
-JavaScriptScanner::JavaScriptScanner()
-    : has_line_terminator_before_next_(false) {}
+JavaScriptScanner::JavaScriptScanner() : Scanner() {}
 
 
 Token::Value JavaScriptScanner::Next() {
@@ -503,12 +496,21 @@ void JavaScriptScanner::Scan() {
 
 
 void JavaScriptScanner::SeekForward(int pos) {
-  source_->SeekForward(pos - 1);
-  Advance();
-  // This function is only called to seek to the location
-  // of the end of a function (at the "}" token). It doesn't matter
-  // whether there was a line terminator in the part we skip.
-  has_line_terminator_before_next_ = false;
+  // After this call, we will have the token at the given position as
+  // the "next" token. The "current" token will be invalid.
+  if (pos == next_.location.beg_pos) return;
+  int current_pos = source_pos();
+  ASSERT_EQ(next_.location.end_pos, current_pos);
+  // Positions inside the lookahead token aren't supported.
+  ASSERT(pos >= current_pos);
+  if (pos != current_pos) {
+    source_->SeekForward(pos - source_->pos());
+    Advance();
+    // This function is only called to seek to the location
+    // of the end of a function (at the "}" token). It doesn't matter
+    // whether there was a line terminator in the part we skip.
+    has_line_terminator_before_next_ = false;
+  }
   Scan();
 }
 
diff --git a/deps/v8/src/scanner-base.h b/deps/v8/src/scanner-base.h
index 3d344f306c..c50b8f3ef6 100644
--- a/deps/v8/src/scanner-base.h
+++ b/deps/v8/src/scanner-base.h
@@ -52,31 +52,75 @@ inline int HexValue(uc32 c) {
   return -1;
 }
 
-// ----------------------------------------------------------------------------
-// UTF16Buffer - scanner input source with pushback.
 
-class UTF16Buffer {
+// ---------------------------------------------------------------------
+// Buffered stream of characters, using an internal UC16 buffer.
+
+class UC16CharacterStream {
  public:
-  UTF16Buffer();
-  virtual ~UTF16Buffer() {}
+  UC16CharacterStream() : pos_(0) { }
+  virtual ~UC16CharacterStream() { }
+
+  // Returns and advances past the next UC16 character in the input
+  // stream. If there are no more characters, it returns a negative
+  // value.
+  inline int32_t Advance() {
+    if (buffer_cursor_ < buffer_end_ || ReadBlock()) {
+      pos_++;
+      return *(buffer_cursor_++);
+    }
+    // Note: currently the following increment is necessary to avoid a
+    // parser problem! The scanner treats the final kEndOfInput as
+    // a character with a position, and does math relative to that
+    // position.
+    pos_++;
 
-  virtual void PushBack(uc32 ch) = 0;
-  // Returns a value < 0 when the buffer end is reached.
-  virtual uc32 Advance() = 0;
-  virtual void SeekForward(int pos) = 0;
+    return kEndOfInput;
+  }
 
-  int pos() const { return pos_; }
+  // Return the current position in the character stream.
+  // Starts at zero.
+  inline unsigned pos() const { return pos_; }
+
+  // Skips forward past the next character_count UC16 characters
+  // in the input, or until the end of input if that comes sooner.
+  // Returns the number of characters actually skipped. If less
+  // than character_count,
+  inline unsigned SeekForward(unsigned character_count) {
+    unsigned buffered_chars =
+        static_cast<unsigned>(buffer_end_ - buffer_cursor_);
+    if (character_count <= buffered_chars) {
+      buffer_cursor_ += character_count;
+      pos_ += character_count;
+      return character_count;
+    }
+    return SlowSeekForward(character_count);
+  }
 
-  static const int kNoEndPosition = 1;
+  // Pushes back the most recently read UC16 character, i.e.,
+  // the value returned by the most recent call to Advance.
+  // Must not be used right after calling SeekForward.
+  virtual void PushBack(uc16 character) = 0;
 
  protected:
-  // Initial value of end_ before the input stream is initialized.
-
-  int pos_;  // Current position in the buffer.
-  int end_;  // Position where scanning should stop (EOF).
+  static const int32_t kEndOfInput = -1;
+
+  // Ensures that the buffer_cursor_ points to the character at
+  // position pos_ of the input, if possible. If the position
+  // is at or after the end of the input, return false. If there
+  // are more characters available, return true.
+  virtual bool ReadBlock() = 0;
+  virtual unsigned SlowSeekForward(unsigned character_count) = 0;
+
+  const uc16* buffer_cursor_;
+  const uc16* buffer_end_;
+  unsigned pos_;
 };
 
 
+// ---------------------------------------------------------------------
+// Constants used by scanners.
+
 class ScannerConstants : AllStatic {
  public:
   typedef unibrow::Utf8InputBuffer<1024> Utf8Decoder;
@@ -277,7 +321,7 @@ class Scanner {
   // Low-level scanning support.
   void Advance() { c0_ = source_->Advance(); }
   void PushBack(uc32 ch) {
-    source_->PushBack(ch);
+    source_->PushBack(c0_);
     c0_ = ch;
   }
 
@@ -307,8 +351,8 @@ class Scanner {
   TokenDesc current_;  // desc for current token (as returned by Next())
   TokenDesc next_;     // desc for next token (one token look-ahead)
 
-  // Input stream. Must be initialized to an UTF16Buffer.
-  UTF16Buffer* source_;
+  // Input stream. Must be initialized to an UC16CharacterStream.
+  UC16CharacterStream* source_;
 
   // Buffer to hold literal values (identifiers, strings, numbers)
   // using '\x00'-terminated UTF-8 encoding. Handles allocation internally.
diff --git a/deps/v8/src/scanner.cc b/deps/v8/src/scanner.cc
index d22ebc741f..47e9895cf4 100755
--- a/deps/v8/src/scanner.cc
+++ b/deps/v8/src/scanner.cc
@@ -36,63 +36,265 @@ namespace v8 {
 namespace internal {
 
 // ----------------------------------------------------------------------------
-// UTF16Buffer
-
-// CharacterStreamUTF16Buffer
-CharacterStreamUTF16Buffer::CharacterStreamUTF16Buffer()
-    : pushback_buffer_(0), last_(0), stream_(NULL) { }
+// BufferedUC16CharacterStreams
+
+BufferedUC16CharacterStream::BufferedUC16CharacterStream()
+    : UC16CharacterStream(),
+      pushback_limit_(NULL) {
+  // Initialize buffer as being empty. First read will fill the buffer.
+  buffer_cursor_ = buffer_;
+  buffer_end_ = buffer_;
+}
 
+BufferedUC16CharacterStream::~BufferedUC16CharacterStream() { }
 
-void CharacterStreamUTF16Buffer::Initialize(Handle<String> data,
-                                            unibrow::CharacterStream* input,
-                                            int start_position,
-                                            int end_position) {
-  stream_ = input;
-  if (start_position > 0) {
-    SeekForward(start_position);
+void BufferedUC16CharacterStream::PushBack(uc16 character) {
+  if (pushback_limit_ == NULL && buffer_cursor_ > buffer_) {
+    // buffer_ is writable, buffer_cursor_ is const pointer.
+    buffer_[--buffer_cursor_ - buffer_] = character;
+    pos_--;
+    return;
   }
-  end_ = end_position != kNoEndPosition ? end_position : kMaxInt;
+  SlowPushBack(character);
 }
 
 
-void CharacterStreamUTF16Buffer::PushBack(uc32 ch) {
-  pushback_buffer()->Add(last_);
-  last_ = ch;
+void BufferedUC16CharacterStream::SlowPushBack(uc16 character) {
+  // In pushback mode, the end of the buffer contains pushback,
+  // and the start of the buffer (from buffer start to pushback_limit_)
+  // contains valid data that comes just after the pushback.
+  // We NULL the pushback_limit_ if pushing all the way back to the
+  // start of the buffer.
+
+  if (pushback_limit_ == NULL) {
+    // Enter pushback mode.
+    pushback_limit_ = buffer_end_;
+    buffer_end_ = buffer_ + kBufferSize;
+    buffer_cursor_ = buffer_end_;
+  }
+  ASSERT(pushback_limit_ > buffer_);
+  ASSERT(pos_ > 0);
+  buffer_[--buffer_cursor_ - buffer_] = character;
+  if (buffer_cursor_ == buffer_) {
+    pushback_limit_ = NULL;
+  } else if (buffer_cursor_ < pushback_limit_) {
+    pushback_limit_ = buffer_cursor_;
+  }
   pos_--;
 }
 
 
-uc32 CharacterStreamUTF16Buffer::Advance() {
-  ASSERT(end_ != kNoEndPosition);
-  ASSERT(end_ >= 0);
-  // NOTE: It is of importance to Persian / Farsi resources that we do
-  // *not* strip format control characters in the scanner; see
-  //
-  //    https://bugzilla.mozilla.org/show_bug.cgi?id=274152
-  //
-  // So, even though ECMA-262, section 7.1, page 11, dictates that we
-  // must remove Unicode format-control characters, we do not. This is
-  // in line with how IE and SpiderMonkey handles it.
-  if (!pushback_buffer()->is_empty()) {
-    pos_++;
-    return last_ = pushback_buffer()->RemoveLast();
-  } else if (stream_->has_more() && pos_ < end_) {
-    pos_++;
-    uc32 next = stream_->GetNext();
-    return last_ = next;
-  } else {
-    // Note: currently the following increment is necessary to avoid a
-    // test-parser problem!
-    pos_++;
-    return last_ = static_cast<uc32>(-1);
+bool BufferedUC16CharacterStream::ReadBlock() {
+  if (pushback_limit_ != NULL) {
+    buffer_cursor_ = buffer_;
+    buffer_end_ = pushback_limit_;
+    pushback_limit_ = NULL;
+    ASSERT(buffer_cursor_ != buffer_end_);
+    return true;
   }
+  unsigned length = FillBuffer(pos_, kBufferSize);
+  buffer_cursor_ = buffer_;
+  buffer_end_ = buffer_ + length;
+  return length > 0;
 }
 
 
-void CharacterStreamUTF16Buffer::SeekForward(int pos) {
-  pos_ = pos;
-  ASSERT(pushback_buffer()->is_empty());
-  stream_->Seek(pos);
+unsigned BufferedUC16CharacterStream::SlowSeekForward(unsigned delta) {
+  // Leave pushback mode (i.e., ignore that there might be valid data
+  // in the buffer before the pushback_limit_ point).
+  pushback_limit_ = NULL;
+  return BufferSeekForward(delta);
+}
+
+// ----------------------------------------------------------------------------
+// GenericStringUC16CharacterStream
+
+
+GenericStringUC16CharacterStream::GenericStringUC16CharacterStream(
+    Handle<String> data,
+    unsigned start_position,
+    unsigned end_position)
+    : string_(data),
+      length_(end_position) {
+  ASSERT(end_position >= start_position);
+  buffer_cursor_ = buffer_;
+  buffer_end_ = buffer_;
+  pos_ = start_position;
+}
+
+
+GenericStringUC16CharacterStream::~GenericStringUC16CharacterStream() { }
+
+
+unsigned GenericStringUC16CharacterStream::BufferSeekForward(unsigned delta) {
+  unsigned old_pos = pos_;
+  pos_ = Min(pos_ + delta, length_);
+  ReadBlock();
+  return pos_ - old_pos;
+}
+
+
+unsigned GenericStringUC16CharacterStream::FillBuffer(unsigned from_pos,
+                                                      unsigned length) {
+  if (from_pos >= length_) return 0;
+  if (from_pos + length > length_) {
+    length = length_ - from_pos;
+  }
+  String::WriteToFlat<uc16>(*string_, buffer_, from_pos, from_pos + length);
+  return length;
+}
+
+
+// ----------------------------------------------------------------------------
+// Utf8ToUC16CharacterStream
+Utf8ToUC16CharacterStream::Utf8ToUC16CharacterStream(const byte* data,
+                                                     unsigned length)
+    : BufferedUC16CharacterStream(),
+      raw_data_(data),
+      raw_data_length_(length),
+      raw_data_pos_(0),
+      raw_character_position_(0) {
+  ReadBlock();
+}
+
+
+Utf8ToUC16CharacterStream::~Utf8ToUC16CharacterStream() { }
+
+
+unsigned Utf8ToUC16CharacterStream::BufferSeekForward(unsigned delta) {
+  unsigned old_pos = pos_;
+  unsigned target_pos = pos_ + delta;
+  SetRawPosition(target_pos);
+  pos_ = raw_character_position_;
+  ReadBlock();
+  return pos_ - old_pos;
+}
+
+
+unsigned Utf8ToUC16CharacterStream::FillBuffer(unsigned char_position,
+                                               unsigned length) {
+  static const unibrow::uchar kMaxUC16Character = 0xffff;
+  SetRawPosition(char_position);
+  if (raw_character_position_ != char_position) {
+    // char_position was not a valid position in the stream (hit the end
+    // while spooling to it).
+    return 0u;
+  }
+  unsigned i = 0;
+  while (i < length) {
+    if (raw_data_pos_ == raw_data_length_) break;
+    unibrow::uchar c = raw_data_[raw_data_pos_];
+    if (c <= unibrow::Utf8::kMaxOneByteChar) {
+      raw_data_pos_++;
+    } else {
+      c =  unibrow::Utf8::CalculateValue(raw_data_ + raw_data_pos_,
+                                         raw_data_length_ - raw_data_pos_,
+                                         &raw_data_pos_);
+      // Don't allow characters outside of the BMP.
+      if (c > kMaxUC16Character) {
+        c = unibrow::Utf8::kBadChar;
+      }
+    }
+    buffer_[i++] = static_cast<uc16>(c);
+  }
+  raw_character_position_ = char_position + i;
+  return i;
+}
+
+
+static const byte kUtf8MultiByteMask = 0xC0;
+static const byte kUtf8MultiByteCharStart = 0xC0;
+static const byte kUtf8MultiByteCharFollower = 0x80;
+
+
+#ifdef DEBUG
+static bool IsUtf8MultiCharacterStart(byte first_byte) {
+  return (first_byte & kUtf8MultiByteMask) == kUtf8MultiByteCharStart;
+}
+#endif
+
+
+static bool IsUtf8MultiCharacterFollower(byte later_byte) {
+  return (later_byte & kUtf8MultiByteMask) == kUtf8MultiByteCharFollower;
+}
+
+
+// Move the cursor back to point at the preceding UTF-8 character start
+// in the buffer.
+static inline void Utf8CharacterBack(const byte* buffer, unsigned* cursor) {
+  byte character = buffer[--*cursor];
+  if (character > unibrow::Utf8::kMaxOneByteChar) {
+    ASSERT(IsUtf8MultiCharacterFollower(character));
+    // Last byte of a multi-byte character encoding. Step backwards until
+    // pointing to the first byte of the encoding, recognized by having the
+    // top two bits set.
+    while (IsUtf8MultiCharacterFollower(buffer[--*cursor])) { }
+    ASSERT(IsUtf8MultiCharacterStart(buffer[*cursor]));
+  }
+}
+
+
+// Move the cursor forward to point at the next following UTF-8 character start
+// in the buffer.
+static inline void Utf8CharacterForward(const byte* buffer, unsigned* cursor) {
+  byte character = buffer[(*cursor)++];
+  if (character > unibrow::Utf8::kMaxOneByteChar) {
+    // First character of a multi-byte character encoding.
+    // The number of most-significant one-bits determines the length of the
+    // encoding:
+    //  110..... - (0xCx, 0xDx) one additional byte (minimum).
+    //  1110.... - (0xEx) two additional bytes.
+    //  11110... - (0xFx) three additional bytes (maximum).
+    ASSERT(IsUtf8MultiCharacterStart(character));
+    // Additional bytes is:
+    // 1 if value in range 0xC0 .. 0xDF.
+    // 2 if value in range 0xE0 .. 0xEF.
+    // 3 if value in range 0xF0 .. 0xF7.
+    // Encode that in a single value.
+    unsigned additional_bytes =
+        ((0x3211u) >> (((character - 0xC0) >> 2) & 0xC)) & 0x03;
+    *cursor += additional_bytes;
+    ASSERT(!IsUtf8MultiCharacterFollower(buffer[1 + additional_bytes]));
+  }
+}
+
+
+void Utf8ToUC16CharacterStream::SetRawPosition(unsigned target_position) {
+  if (raw_character_position_ > target_position) {
+    // Spool backwards in utf8 buffer.
+    do {
+      Utf8CharacterBack(raw_data_, &raw_data_pos_);
+      raw_character_position_--;
+    } while (raw_character_position_ > target_position);
+    return;
+  }
+  // Spool forwards in the utf8 buffer.
+  while (raw_character_position_ < target_position) {
+    if (raw_data_pos_ == raw_data_length_) return;
+    Utf8CharacterForward(raw_data_, &raw_data_pos_);
+    raw_character_position_++;
+  }
+}
+
+
+// ----------------------------------------------------------------------------
+// ExternalTwoByteStringUC16CharacterStream
+
+ExternalTwoByteStringUC16CharacterStream::
+    ~ExternalTwoByteStringUC16CharacterStream() { }
+
+
+ExternalTwoByteStringUC16CharacterStream
+    ::ExternalTwoByteStringUC16CharacterStream(
+        Handle<ExternalTwoByteString> data,
+        int start_position,
+        int end_position)
+    : UC16CharacterStream(),
+      source_(data),
+      raw_data_(data->GetTwoByteData(start_position)) {
+  buffer_cursor_ = raw_data_,
+  buffer_end_ = raw_data_ + (end_position - start_position);
+  pos_ = start_position;
 }
 
 
@@ -115,46 +317,19 @@ void Scanner::LiteralScope::Complete() {
   complete_ = true;
 }
 
+
 // ----------------------------------------------------------------------------
 // V8JavaScriptScanner
 
-void V8JavaScriptScanner::Initialize(Handle<String> source,
-                                     int literal_flags) {
-  source_ = stream_initializer_.Init(source, NULL, 0, source->length());
-  // Need to capture identifiers in order to recognize "get" and "set"
-  // in object literals.
-  literal_flags_ = literal_flags | kLiteralIdentifier;
-  Init();
-  // Skip initial whitespace allowing HTML comment ends just like
-  // after a newline and scan first token.
-  has_line_terminator_before_next_ = true;
-  SkipWhiteSpace();
-  Scan();
-}
-
-
-void V8JavaScriptScanner::Initialize(Handle<String> source,
-                                     unibrow::CharacterStream* stream,
-                                     int literal_flags) {
-  source_ = stream_initializer_.Init(source, stream,
-                                     0, UTF16Buffer::kNoEndPosition);
-  literal_flags_ = literal_flags | kLiteralIdentifier;
-  Init();
-  // Skip initial whitespace allowing HTML comment ends just like
-  // after a newline and scan first token.
-  has_line_terminator_before_next_ = true;
-  SkipWhiteSpace();
-  Scan();
-}
+V8JavaScriptScanner::V8JavaScriptScanner() : JavaScriptScanner() { }
 
 
-void V8JavaScriptScanner::Initialize(Handle<String> source,
-                                     int start_position,
-                                     int end_position,
+void V8JavaScriptScanner::Initialize(UC16CharacterStream* source,
                                      int literal_flags) {
-  source_ = stream_initializer_.Init(source, NULL,
-                                     start_position, end_position);
+  source_ = source;
   literal_flags_ = literal_flags | kLiteralIdentifier;
+  // Need to capture identifiers in order to recognize "get" and "set"
+  // in object literals.
   Init();
   // Skip initial whitespace allowing HTML comment ends just like
   // after a newline and scan first token.
@@ -164,48 +339,14 @@ void V8JavaScriptScanner::Initialize(Handle<String> source,
 }
 
 
-UTF16Buffer* StreamInitializer::Init(Handle<String> source,
-                                     unibrow::CharacterStream* stream,
-                                     int start_position,
-                                     int end_position) {
-  // Either initialize the scanner from a character stream or from a
-  // string.
-  ASSERT(source.is_null() || stream == NULL);
-
-  // Initialize the source buffer.
-  if (!source.is_null() && StringShape(*source).IsExternalTwoByte()) {
-    two_byte_string_buffer_.Initialize(
-        Handle<ExternalTwoByteString>::cast(source),
-        start_position,
-        end_position);
-    return &two_byte_string_buffer_;
-  } else if (!source.is_null() && StringShape(*source).IsExternalAscii()) {
-    ascii_string_buffer_.Initialize(
-        Handle<ExternalAsciiString>::cast(source),
-        start_position,
-        end_position);
-    return &ascii_string_buffer_;
-  } else {
-    if (!source.is_null()) {
-      safe_string_input_buffer_.Reset(source.location());
-      stream = &safe_string_input_buffer_;
-    }
-    char_stream_buffer_.Initialize(source,
-                                   stream,
-                                   start_position,
-                                   end_position);
-    return &char_stream_buffer_;
-  }
-}
-
 // ----------------------------------------------------------------------------
 // JsonScanner
 
-JsonScanner::JsonScanner() {}
+JsonScanner::JsonScanner() : Scanner() { }
 
 
-void JsonScanner::Initialize(Handle<String> source) {
-  source_ = stream_initializer_.Init(source, NULL, 0, source->length());
+void JsonScanner::Initialize(UC16CharacterStream* source) {
+  source_ = source;
   Init();
   // Skip initial whitespace.
   SkipJsonWhiteSpace();
diff --git a/deps/v8/src/scanner.h b/deps/v8/src/scanner.h
index adeea9b23a..572778f8ac 100644
--- a/deps/v8/src/scanner.h
+++ b/deps/v8/src/scanner.h
@@ -35,67 +35,97 @@
 namespace v8 {
 namespace internal {
 
-// UTF16 buffer to read characters from a character stream.
-class CharacterStreamUTF16Buffer: public UTF16Buffer {
+// A buffered character stream based on a random access character
+// source (ReadBlock can be called with pos_ pointing to any position,
+// even positions before the current).
+class BufferedUC16CharacterStream: public UC16CharacterStream {
  public:
-  CharacterStreamUTF16Buffer();
-  virtual ~CharacterStreamUTF16Buffer() {}
-  void Initialize(Handle<String> data,
-                  unibrow::CharacterStream* stream,
-                  int start_position,
-                  int end_position);
-  virtual void PushBack(uc32 ch);
-  virtual uc32 Advance();
-  virtual void SeekForward(int pos);
-
- private:
-  List<uc32> pushback_buffer_;
-  uc32 last_;
-  unibrow::CharacterStream* stream_;
-
-  List<uc32>* pushback_buffer() { return &pushback_buffer_; }
+  BufferedUC16CharacterStream();
+  virtual ~BufferedUC16CharacterStream();
+
+  virtual void PushBack(uc16 character);
+
+ protected:
+  static const unsigned kBufferSize = 512;
+  static const unsigned kPushBackStepSize = 16;
+
+  virtual unsigned SlowSeekForward(unsigned delta);
+  virtual bool ReadBlock();
+  virtual void SlowPushBack(uc16 character);
+
+  virtual unsigned BufferSeekForward(unsigned delta) = 0;
+  virtual unsigned FillBuffer(unsigned position, unsigned length) = 0;
+
+  const uc16* pushback_limit_;
+  uc16 buffer_[kBufferSize];
 };
 
 
-// UTF16 buffer to read characters from an external string.
-template <typename StringType, typename CharType>
-class ExternalStringUTF16Buffer: public UTF16Buffer {
+// Generic string stream.
+class GenericStringUC16CharacterStream: public BufferedUC16CharacterStream {
  public:
-  ExternalStringUTF16Buffer();
-  virtual ~ExternalStringUTF16Buffer() {}
-  void Initialize(Handle<StringType> data,
-                  int start_position,
-                  int end_position);
-  virtual void PushBack(uc32 ch);
-  virtual uc32 Advance();
-  virtual void SeekForward(int pos);
-
- private:
-  const CharType* raw_data_;  // Pointer to the actual array of characters.
+  GenericStringUC16CharacterStream(Handle<String> data,
+                                   unsigned start_position,
+                                   unsigned end_position);
+  virtual ~GenericStringUC16CharacterStream();
+
+ protected:
+  virtual unsigned BufferSeekForward(unsigned delta);
+  virtual unsigned FillBuffer(unsigned position, unsigned length);
+
+  Handle<String> string_;
+  unsigned start_position_;
+  unsigned length_;
 };
 
 
-// Initializes a UTF16Buffer as input stream, using one of a number
-// of strategies depending on the available character sources.
-class StreamInitializer {
+// UC16 stream based on a literal UTF-8 string.
+class Utf8ToUC16CharacterStream: public BufferedUC16CharacterStream {
  public:
-  UTF16Buffer* Init(Handle<String> source,
-                    unibrow::CharacterStream* stream,
-                    int start_position,
-                    int end_position);
- private:
-  // Different UTF16 buffers used to pull characters from. Based on input one of
-  // these will be initialized as the actual data source.
-  CharacterStreamUTF16Buffer char_stream_buffer_;
-  ExternalStringUTF16Buffer<ExternalTwoByteString, uint16_t>
-      two_byte_string_buffer_;
-  ExternalStringUTF16Buffer<ExternalAsciiString, char> ascii_string_buffer_;
-
-  // Used to convert the source string into a character stream when a stream
-  // is not passed to the scanner.
-  SafeStringInputBuffer safe_string_input_buffer_;
+  Utf8ToUC16CharacterStream(const byte* data, unsigned length);
+  virtual ~Utf8ToUC16CharacterStream();
+
+ protected:
+  virtual unsigned BufferSeekForward(unsigned delta);
+  virtual unsigned FillBuffer(unsigned char_position, unsigned length);
+  void SetRawPosition(unsigned char_position);
+
+  const byte* raw_data_;
+  unsigned raw_data_length_;  // Measured in bytes, not characters.
+  unsigned raw_data_pos_;
+  // The character position of the character at raw_data[raw_data_pos_].
+  // Not necessarily the same as pos_.
+  unsigned raw_character_position_;
+};
+
+
+// UTF16 buffer to read characters from an external string.
+class ExternalTwoByteStringUC16CharacterStream: public UC16CharacterStream {
+ public:
+  ExternalTwoByteStringUC16CharacterStream(Handle<ExternalTwoByteString> data,
+                                           int start_position,
+                                           int end_position);
+  virtual ~ExternalTwoByteStringUC16CharacterStream();
+
+  virtual void PushBack(uc16 character) {
+    ASSERT(buffer_cursor_ > raw_data_);
+    buffer_cursor_--;
+    pos_--;
+  }
+ protected:
+  virtual unsigned SlowSeekForward(unsigned delta) {
+    // Fast case always handles seeking.
+    return 0;
+  }
+  virtual bool ReadBlock() {
+    // Entire string is read at start.
+    return false;
+  }
+  Handle<ExternalTwoByteString> source_;
+  const uc16* raw_data_;  // Pointer to the actual array of characters.
 };
 
+
 // ----------------------------------------------------------------------------
 // V8JavaScriptScanner
 // JavaScript scanner getting its input from either a V8 String or a unicode
@@ -103,19 +133,9 @@ class StreamInitializer {
 
 class V8JavaScriptScanner : public JavaScriptScanner {
  public:
-  V8JavaScriptScanner() {}
-
-  // Initialize the Scanner to scan source.
-  void Initialize(Handle<String> source, int literal_flags = kAllLiterals);
-  void Initialize(Handle<String> source,
-                  unibrow::CharacterStream* stream,
-                  int literal_flags = kAllLiterals);
-  void Initialize(Handle<String> source,
-                  int start_position, int end_position,
+  V8JavaScriptScanner();
+  void Initialize(UC16CharacterStream* source,
                   int literal_flags = kAllLiterals);
-
- protected:
-  StreamInitializer stream_initializer_;
 };
 
 
@@ -123,8 +143,7 @@ class JsonScanner : public Scanner {
  public:
   JsonScanner();
 
-  // Initialize the Scanner to scan source.
-  void Initialize(Handle<String> source);
+  void Initialize(UC16CharacterStream* source);
 
   // Returns the next token.
   Token::Value Next();
@@ -138,7 +157,7 @@ class JsonScanner : public Scanner {
   // Recognizes all of the single-character tokens directly, or calls a function
   // to scan a number, string or identifier literal.
   // The only allowed whitespace characters between tokens are tab,
-  // carrige-return, newline and space.
+  // carriage-return, newline and space.
   void ScanJson();
 
   // A JSON number (production JSONNumber) is a subset of the valid JavaScript
@@ -159,60 +178,8 @@ class JsonScanner : public Scanner {
   // are the only valid JSON identifiers (productions JSONBooleanLiteral,
   // JSONNullLiteral).
   Token::Value ScanJsonIdentifier(const char* text, Token::Value token);
-
-  StreamInitializer stream_initializer_;
 };
 
-
-// ExternalStringUTF16Buffer
-template <typename StringType, typename CharType>
-ExternalStringUTF16Buffer<StringType, CharType>::ExternalStringUTF16Buffer()
-    : raw_data_(NULL) { }
-
-
-template <typename StringType, typename CharType>
-void ExternalStringUTF16Buffer<StringType, CharType>::Initialize(
-     Handle<StringType> data,
-     int start_position,
-     int end_position) {
-  ASSERT(!data.is_null());
-  raw_data_ = data->resource()->data();
-
-  ASSERT(end_position <= data->length());
-  if (start_position > 0) {
-    SeekForward(start_position);
-  }
-  end_ =
-      end_position != kNoEndPosition ? end_position : data->length();
-}
-
-
-template <typename StringType, typename CharType>
-uc32 ExternalStringUTF16Buffer<StringType, CharType>::Advance() {
-  if (pos_ < end_) {
-    return raw_data_[pos_++];
-  } else {
-    // note: currently the following increment is necessary to avoid a
-    // test-parser problem!
-    pos_++;
-    return static_cast<uc32>(-1);
-  }
-}
-
-
-template <typename StringType, typename CharType>
-void ExternalStringUTF16Buffer<StringType, CharType>::PushBack(uc32 ch) {
-  pos_--;
-  ASSERT(pos_ >= Scanner::kCharacterLookaheadBufferSize);
-  ASSERT(raw_data_[pos_ - Scanner::kCharacterLookaheadBufferSize] == ch);
-}
-
-
-template <typename StringType, typename CharType>
-void ExternalStringUTF16Buffer<StringType, CharType>::SeekForward(int pos) {
-  pos_ = pos;
-}
-
 } }  // namespace v8::internal
 
 #endif  // V8_SCANNER_H_
diff --git a/deps/v8/src/serialize.cc b/deps/v8/src/serialize.cc
index 6edc4fae81..00a601ffd9 100644
--- a/deps/v8/src/serialize.cc
+++ b/deps/v8/src/serialize.cc
@@ -486,6 +486,18 @@ void ExternalReferenceTable::PopulateTable() {
       UNCLASSIFIED,
       36,
       "LDoubleConstant::one_half");
+  Add(ExternalReference::address_of_negative_infinity().address(),
+      UNCLASSIFIED,
+      37,
+      "LDoubleConstant::negative_infinity");
+  Add(ExternalReference::power_double_double_function().address(),
+      UNCLASSIFIED,
+      38,
+      "power_double_double_function");
+  Add(ExternalReference::power_double_int_function().address(),
+      UNCLASSIFIED,
+      39,
+      "power_double_int_function");
 }
 
 
diff --git a/deps/v8/src/spaces.cc b/deps/v8/src/spaces.cc
index 369eb6fbda..cdc682f879 100644
--- a/deps/v8/src/spaces.cc
+++ b/deps/v8/src/spaces.cc
@@ -917,7 +917,7 @@ AtomicWord* MemoryAllocator::AllocatedChunksFinder(
     }
     more_fine_grained_table = new AtomicWord[words_needed];
     for (int i = 0; i < words_needed; i++) {
-      more_fine_grained_table[i] = NULL;
+      more_fine_grained_table[i] = kUnusedChunkTableEntry;
     }
     Release_Store(&table[index],
                   reinterpret_cast<AtomicWord>(more_fine_grained_table));
diff --git a/deps/v8/src/string.js b/deps/v8/src/string.js
index 3b3c82bb72..576ffc85d8 100644
--- a/deps/v8/src/string.js
+++ b/deps/v8/src/string.js
@@ -101,28 +101,28 @@ function StringConcat() {
 
 
 // ECMA-262 section 15.5.4.7
-function StringIndexOf(searchString /* position */) {  // length == 1
-  var subject_str = TO_STRING_INLINE(this);
-  var pattern_str = TO_STRING_INLINE(searchString);
-  var subject_str_len = subject_str.length;
-  var pattern_str_len = pattern_str.length;
+function StringIndexOf(pattern /* position */) {  // length == 1
+  var subject = TO_STRING_INLINE(this);
+  var pattern = TO_STRING_INLINE(pattern);
+  var subject_len = subject.length;
+  var pattern_len = pattern.length;
   var index = 0;
   if (%_ArgumentsLength() > 1) {
     var arg1 = %_Arguments(1);  // position
     index = TO_INTEGER(arg1);
   }
   if (index < 0) index = 0;
-  if (index > subject_str_len) index = subject_str_len;
-  if (pattern_str_len + index > subject_str_len) return -1;
-  return %StringIndexOf(subject_str, pattern_str, index);
+  if (index > subject_len) index = subject_len;
+  if (pattern_len + index > subject_len) return -1;
+  return %StringIndexOf(subject, pattern, index);
 }
 
 
 // ECMA-262 section 15.5.4.8
-function StringLastIndexOf(searchString /* position */) {  // length == 1
+function StringLastIndexOf(pat /* position */) {  // length == 1
   var sub = TO_STRING_INLINE(this);
   var subLength = sub.length;
-  var pat = TO_STRING_INLINE(searchString);
+  var pat = TO_STRING_INLINE(pat);
   var patLength = pat.length;
   var index = subLength - patLength;
   if (%_ArgumentsLength() > 1) {
@@ -150,10 +150,8 @@ function StringLastIndexOf(searchString /* position */) {  // length == 1
 // do anything locale specific.
 function StringLocaleCompare(other) {
   if (%_ArgumentsLength() === 0) return 0;
-
-  var this_str = TO_STRING_INLINE(this);
-  var other_str = TO_STRING_INLINE(other);
-  return %StringLocaleCompare(this_str, other_str);
+  return %StringLocaleCompare(TO_STRING_INLINE(this), 
+                              TO_STRING_INLINE(other));
 }
 
 
@@ -177,9 +175,7 @@ function StringMatch(regexp) {
 // otherwise we call the runtime system.
 function SubString(string, start, end) {
   // Use the one character string cache.
-  if (start + 1 == end) {
-    return %_StringCharAt(string, start);
-  }
+  if (start + 1 == end) return %_StringCharAt(string, start);
   return %_SubString(string, start, end);
 }
 
@@ -208,7 +204,10 @@ function StringReplace(search, replace) {
                                                         replace);
       }
     } else {
-      return StringReplaceRegExp(subject, search, replace);
+      return %StringReplaceRegExpWithString(subject,
+                                            search,
+                                            TO_STRING_INLINE(replace),
+                                            lastMatchInfo);
     }
   }
 
@@ -224,7 +223,11 @@ function StringReplace(search, replace) {
 
   // Compute the string to replace with.
   if (IS_FUNCTION(replace)) {
-    builder.add(replace.call(null, search, start, subject));
+    builder.add(%_CallFunction(%GetGlobalReceiver(),
+                               search,
+                               start,
+                               subject,
+                               replace));
   } else {
     reusableMatchInfo[CAPTURE0] = start;
     reusableMatchInfo[CAPTURE1] = end;
@@ -239,15 +242,6 @@ function StringReplace(search, replace) {
 }
 
 
-// Helper function for regular expressions in String.prototype.replace.
-function StringReplaceRegExp(subject, regexp, replace) {
-  return %StringReplaceRegExpWithString(subject,
-                                        regexp,
-                                        TO_STRING_INLINE(replace),
-                                        lastMatchInfo);
-}
-
-
 // Expand the $-expressions in the string and return a new string with
 // the result.
 function ExpandReplacement(string, subject, matchInfo, builder) {
@@ -408,9 +402,7 @@ function StringReplaceGlobalRegExpWithFunction(subject, regexp, replace) {
         lastMatchInfoOverride = override;
         var func_result =
             %_CallFunction(receiver, elem, match_start, subject, replace);
-        if (!IS_STRING(func_result)) {
-          func_result = NonStringToString(func_result);
-        }
+        func_result = TO_STRING_INLINE(func_result); 
         res[i] = func_result;
         match_start += elem.length;
       }
@@ -424,9 +416,7 @@ function StringReplaceGlobalRegExpWithFunction(subject, regexp, replace) {
         // Use the apply argument as backing for global RegExp properties.
         lastMatchInfoOverride = elem;
         var func_result = replace.apply(null, elem);
-        if (!IS_STRING(func_result)) {
-          func_result = NonStringToString(func_result);
-        }
+        func_result = TO_STRING_INLINE(func_result); 
         res[i] = func_result;
       }
       i++;
@@ -487,8 +477,7 @@ function StringSearch(re) {
   } else {
     regexp = new $RegExp(re);
   }
-  var s = TO_STRING_INLINE(this);
-  var match = DoRegExpExec(regexp, s, 0);
+  var match = DoRegExpExec(regexp, TO_STRING_INLINE(this), 0);
   if (match) {
     return match[CAPTURE0];
   }
@@ -576,14 +565,14 @@ function StringSplit(separator, limit) {
   while (true) {
 
     if (startIndex === length) {
-      result[result.length] = subject.slice(currentIndex, length);
+      result.push(subject.slice(currentIndex, length));
       break;
     }
 
     var matchInfo = splitMatch(separator, subject, currentIndex, startIndex);
 
     if (IS_NULL(matchInfo)) {
-      result[result.length] = subject.slice(currentIndex, length);
+      result.push(subject.slice(currentIndex, length));
       break;
     }
 
@@ -595,17 +584,21 @@ function StringSplit(separator, limit) {
       continue;
     }
 
-    result[result.length] = SubString(subject, currentIndex, matchInfo[CAPTURE0]);
+    result.push(SubString(subject, currentIndex, matchInfo[CAPTURE0]));
     if (result.length === limit) break;
 
-    var num_captures = NUMBER_OF_CAPTURES(matchInfo);
-    for (var i = 2; i < num_captures; i += 2) {
-      var start = matchInfo[CAPTURE(i)];
-      var end = matchInfo[CAPTURE(i + 1)];
-      if (start != -1 && end != -1) {
-        result[result.length] = SubString(subject, start, end);
+    var matchinfo_len = NUMBER_OF_CAPTURES(matchInfo) + REGEXP_FIRST_CAPTURE;
+    for (var i = REGEXP_FIRST_CAPTURE + 2; i < matchinfo_len; ) {
+      var start = matchInfo[i++];
+      var end = matchInfo[i++];
+      if (end != -1) {
+        if (start + 1 == end) {
+          result.push(%_StringCharAt(subject, start));
+        } else {
+          result.push(%_SubString(subject, start, end));
+        }
       } else {
-        result[result.length] = void 0;
+        result.push(void 0);
       }
       if (result.length === limit) break outer_loop;
     }
@@ -656,7 +649,9 @@ function StringSubstring(start, end) {
     }
   }
 
-  return SubString(s, start_i, end_i);
+  return (start_i + 1 == end_i
+          ? %_StringCharAt(s, start_i)
+          : %_SubString(s, start_i, end_i));
 }
 
 
@@ -694,7 +689,9 @@ function StringSubstr(start, n) {
   var end = start + len;
   if (end > s.length) end = s.length;
 
-  return SubString(s, start, end);
+  return (start + 1 == end
+          ? %_StringCharAt(s, start)
+          : %_SubString(s, start, end));
 }
 
 
diff --git a/deps/v8/src/v8natives.js b/deps/v8/src/v8natives.js
index 50a2774d12..8e057037e4 100644
--- a/deps/v8/src/v8natives.js
+++ b/deps/v8/src/v8natives.js
@@ -615,7 +615,13 @@ function DefineOwnProperty(obj, p, desc, should_throw) {
     } else {
       flag |= READ_ONLY;
     }
-    %DefineOrRedefineDataProperty(obj, p, desc.getValue(), flag);
+    var value = void 0;  // Default value is undefined.
+    if (desc.hasValue()) {
+      value = desc.getValue();
+    } else if (!IS_UNDEFINED(current)) {
+      value = current.getValue();
+    }
+    %DefineOrRedefineDataProperty(obj, p, value, flag);
   } else {
     if (desc.hasGetter() && IS_FUNCTION(desc.getGet())) {
        %DefineOrRedefineAccessorProperty(obj, p, GETTER, desc.getGet(), flag);
diff --git a/deps/v8/src/v8preparserdll-main.cc b/deps/v8/src/v8preparserdll-main.cc
new file mode 100644
index 0000000000..c0344d344a
--- /dev/null
+++ b/deps/v8/src/v8preparserdll-main.cc
@@ -0,0 +1,39 @@
+// Copyright 2010 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
+//       disclaimer in the documentation and/or other materials provided
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include <windows.h>
+
+#include "../include/v8-preparser.h"
+
+extern "C" {
+BOOL WINAPI DllMain(HANDLE hinstDLL,
+                    DWORD dwReason,
+                    LPVOID lpvReserved) {
+  // Do nothing.
+  return TRUE;
+}
+}
diff --git a/deps/v8/src/version.cc b/deps/v8/src/version.cc
index d2166b4db6..7db4a4126e 100644
--- a/deps/v8/src/version.cc
+++ b/deps/v8/src/version.cc
@@ -34,8 +34,8 @@
 // cannot be changed without changing the SCons build script.
 #define MAJOR_VERSION     3
 #define MINOR_VERSION     0
-#define BUILD_NUMBER      0
-#define PATCH_LEVEL       1
+#define BUILD_NUMBER      1
+#define PATCH_LEVEL       0
 #define CANDIDATE_VERSION false
 
 // Define SONAME to have the SCons build the put a specific SONAME into the
diff --git a/deps/v8/src/x64/builtins-x64.cc b/deps/v8/src/x64/builtins-x64.cc
index 540593fef5..456d0765b9 100644
--- a/deps/v8/src/x64/builtins-x64.cc
+++ b/deps/v8/src/x64/builtins-x64.cc
@@ -30,11 +30,13 @@
 #if defined(V8_TARGET_ARCH_X64)
 
 #include "codegen-inl.h"
-#include "macro-assembler.h"
+#include "deoptimizer.h"
+#include "full-codegen.h"
 
 namespace v8 {
 namespace internal {
 
+
 #define __ ACCESS_MASM(masm)
 
 
@@ -71,1315 +73,1309 @@ void Builtins::Generate_Adaptor(MacroAssembler* masm,
 }
 
 
-static void EnterArgumentsAdaptorFrame(MacroAssembler* masm) {
-  __ push(rbp);
-  __ movq(rbp, rsp);
+void Builtins::Generate_JSConstructCall(MacroAssembler* masm) {
+  // ----------- S t a t e -------------
+  //  -- rax: number of arguments
+  //  -- rdi: constructor function
+  // -----------------------------------
 
-  // Store the arguments adaptor context sentinel.
-  __ Push(Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR));
+  Label non_function_call;
+  // Check that function is not a smi.
+  __ JumpIfSmi(rdi, &non_function_call);
+  // Check that function is a JSFunction.
+  __ CmpObjectType(rdi, JS_FUNCTION_TYPE, rcx);
+  __ j(not_equal, &non_function_call);
 
-  // Push the function on the stack.
-  __ push(rdi);
+  // Jump to the function-specific construct stub.
+  __ movq(rbx, FieldOperand(rdi, JSFunction::kSharedFunctionInfoOffset));
+  __ movq(rbx, FieldOperand(rbx, SharedFunctionInfo::kConstructStubOffset));
+  __ lea(rbx, FieldOperand(rbx, Code::kHeaderSize));
+  __ jmp(rbx);
 
-  // Preserve the number of arguments on the stack. Must preserve both
-  // rax and rbx because these registers are used when copying the
-  // arguments and the receiver.
-  __ Integer32ToSmi(rcx, rax);
-  __ push(rcx);
+  // rdi: called object
+  // rax: number of arguments
+  __ bind(&non_function_call);
+  // Set expected number of arguments to zero (not changing rax).
+  __ movq(rbx, Immediate(0));
+  __ GetBuiltinEntry(rdx, Builtins::CALL_NON_FUNCTION_AS_CONSTRUCTOR);
+  __ Jump(Handle<Code>(builtin(ArgumentsAdaptorTrampoline)),
+          RelocInfo::CODE_TARGET);
 }
 
 
-static void LeaveArgumentsAdaptorFrame(MacroAssembler* masm) {
-  // Retrieve the number of arguments from the stack. Number is a Smi.
-  __ movq(rbx, Operand(rbp, ArgumentsAdaptorFrameConstants::kLengthOffset));
-
-  // Leave the frame.
-  __ movq(rsp, rbp);
-  __ pop(rbp);
+static void Generate_JSConstructStubHelper(MacroAssembler* masm,
+                                           bool is_api_function,
+                                           bool count_constructions) {
+  // Should never count constructions for api objects.
+  ASSERT(!is_api_function || !count_constructions);
 
-  // Remove caller arguments from the stack.
-  __ pop(rcx);
-  SmiIndex index = masm->SmiToIndex(rbx, rbx, kPointerSizeLog2);
-  __ lea(rsp, Operand(rsp, index.reg, index.scale, 1 * kPointerSize));
-  __ push(rcx);
-}
+    // Enter a construct frame.
+  __ EnterConstructFrame();
 
+  // Store a smi-tagged arguments count on the stack.
+  __ Integer32ToSmi(rax, rax);
+  __ push(rax);
 
-void Builtins::Generate_ArgumentsAdaptorTrampoline(MacroAssembler* masm) {
-  // ----------- S t a t e -------------
-  //  -- rax : actual number of arguments
-  //  -- rbx : expected number of arguments
-  //  -- rdx : code entry to call
-  // -----------------------------------
+  // Push the function to invoke on the stack.
+  __ push(rdi);
 
-  Label invoke, dont_adapt_arguments;
-  __ IncrementCounter(&Counters::arguments_adaptors, 1);
+  // Try to allocate the object without transitioning into C code. If any of the
+  // preconditions is not met, the code bails out to the runtime call.
+  Label rt_call, allocated;
+  if (FLAG_inline_new) {
+    Label undo_allocation;
 
-  Label enough, too_few;
-  __ cmpq(rax, rbx);
-  __ j(less, &too_few);
-  __ cmpq(rbx, Immediate(SharedFunctionInfo::kDontAdaptArgumentsSentinel));
-  __ j(equal, &dont_adapt_arguments);
+#ifdef ENABLE_DEBUGGER_SUPPORT
+    ExternalReference debug_step_in_fp =
+        ExternalReference::debug_step_in_fp_address();
+    __ movq(kScratchRegister, debug_step_in_fp);
+    __ cmpq(Operand(kScratchRegister, 0), Immediate(0));
+    __ j(not_equal, &rt_call);
+#endif
 
-  {  // Enough parameters: Actual >= expected.
-    __ bind(&enough);
-    EnterArgumentsAdaptorFrame(masm);
+    // Verified that the constructor is a JSFunction.
+    // Load the initial map and verify that it is in fact a map.
+    // rdi: constructor
+    __ movq(rax, FieldOperand(rdi, JSFunction::kPrototypeOrInitialMapOffset));
+    // Will both indicate a NULL and a Smi
+    ASSERT(kSmiTag == 0);
+    __ JumpIfSmi(rax, &rt_call);
+    // rdi: constructor
+    // rax: initial map (if proven valid below)
+    __ CmpObjectType(rax, MAP_TYPE, rbx);
+    __ j(not_equal, &rt_call);
 
-    // Copy receiver and all expected arguments.
-    const int offset = StandardFrameConstants::kCallerSPOffset;
-    __ lea(rax, Operand(rbp, rax, times_pointer_size, offset));
-    __ movq(rcx, Immediate(-1));  // account for receiver
+    // Check that the constructor is not constructing a JSFunction (see comments
+    // in Runtime_NewObject in runtime.cc). In which case the initial map's
+    // instance type would be JS_FUNCTION_TYPE.
+    // rdi: constructor
+    // rax: initial map
+    __ CmpInstanceType(rax, JS_FUNCTION_TYPE);
+    __ j(equal, &rt_call);
 
-    Label copy;
-    __ bind(&copy);
-    __ incq(rcx);
-    __ push(Operand(rax, 0));
-    __ subq(rax, Immediate(kPointerSize));
-    __ cmpq(rcx, rbx);
-    __ j(less, &copy);
-    __ jmp(&invoke);
-  }
+    if (count_constructions) {
+      Label allocate;
+      // Decrease generous allocation count.
+      __ movq(rcx, FieldOperand(rdi, JSFunction::kSharedFunctionInfoOffset));
+      __ decb(FieldOperand(rcx, SharedFunctionInfo::kConstructionCountOffset));
+      __ j(not_zero, &allocate);
 
-  {  // Too few parameters: Actual < expected.
-    __ bind(&too_few);
-    EnterArgumentsAdaptorFrame(masm);
+      __ push(rax);
+      __ push(rdi);
 
-    // Copy receiver and all actual arguments.
-    const int offset = StandardFrameConstants::kCallerSPOffset;
-    __ lea(rdi, Operand(rbp, rax, times_pointer_size, offset));
-    __ movq(rcx, Immediate(-1));  // account for receiver
+      __ push(rdi);  // constructor
+      // The call will replace the stub, so the countdown is only done once.
+      __ CallRuntime(Runtime::kFinalizeInstanceSize, 1);
 
-    Label copy;
-    __ bind(&copy);
-    __ incq(rcx);
-    __ push(Operand(rdi, 0));
-    __ subq(rdi, Immediate(kPointerSize));
-    __ cmpq(rcx, rax);
-    __ j(less, &copy);
+      __ pop(rdi);
+      __ pop(rax);
 
-    // Fill remaining expected arguments with undefined values.
-    Label fill;
-    __ LoadRoot(kScratchRegister, Heap::kUndefinedValueRootIndex);
-    __ bind(&fill);
-    __ incq(rcx);
-    __ push(kScratchRegister);
-    __ cmpq(rcx, rbx);
-    __ j(less, &fill);
+      __ bind(&allocate);
+    }
 
-    // Restore function pointer.
-    __ movq(rdi, Operand(rbp, JavaScriptFrameConstants::kFunctionOffset));
-  }
+    // Now allocate the JSObject on the heap.
+    __ movzxbq(rdi, FieldOperand(rax, Map::kInstanceSizeOffset));
+    __ shl(rdi, Immediate(kPointerSizeLog2));
+    // rdi: size of new object
+    __ AllocateInNewSpace(rdi,
+                          rbx,
+                          rdi,
+                          no_reg,
+                          &rt_call,
+                          NO_ALLOCATION_FLAGS);
+    // Allocated the JSObject, now initialize the fields.
+    // rax: initial map
+    // rbx: JSObject (not HeapObject tagged - the actual address).
+    // rdi: start of next object
+    __ movq(Operand(rbx, JSObject::kMapOffset), rax);
+    __ LoadRoot(rcx, Heap::kEmptyFixedArrayRootIndex);
+    __ movq(Operand(rbx, JSObject::kPropertiesOffset), rcx);
+    __ movq(Operand(rbx, JSObject::kElementsOffset), rcx);
+    // Set extra fields in the newly allocated object.
+    // rax: initial map
+    // rbx: JSObject
+    // rdi: start of next object
+    { Label loop, entry;
+      // To allow for truncation.
+      if (count_constructions) {
+        __ LoadRoot(rdx, Heap::kOnePointerFillerMapRootIndex);
+      } else {
+        __ LoadRoot(rdx, Heap::kUndefinedValueRootIndex);
+      }
+      __ lea(rcx, Operand(rbx, JSObject::kHeaderSize));
+      __ jmp(&entry);
+      __ bind(&loop);
+      __ movq(Operand(rcx, 0), rdx);
+      __ addq(rcx, Immediate(kPointerSize));
+      __ bind(&entry);
+      __ cmpq(rcx, rdi);
+      __ j(less, &loop);
+    }
 
-  // Call the entry point.
-  __ bind(&invoke);
-  __ call(rdx);
+    // Add the object tag to make the JSObject real, so that we can continue and
+    // jump into the continuation code at any time from now on. Any failures
+    // need to undo the allocation, so that the heap is in a consistent state
+    // and verifiable.
+    // rax: initial map
+    // rbx: JSObject
+    // rdi: start of next object
+    __ or_(rbx, Immediate(kHeapObjectTag));
 
-  // Leave frame and return.
-  LeaveArgumentsAdaptorFrame(masm);
-  __ ret(0);
+    // Check if a non-empty properties array is needed.
+    // Allocate and initialize a FixedArray if it is.
+    // rax: initial map
+    // rbx: JSObject
+    // rdi: start of next object
+    // Calculate total properties described map.
+    __ movzxbq(rdx, FieldOperand(rax, Map::kUnusedPropertyFieldsOffset));
+    __ movzxbq(rcx, FieldOperand(rax, Map::kPreAllocatedPropertyFieldsOffset));
+    __ addq(rdx, rcx);
+    // Calculate unused properties past the end of the in-object properties.
+    __ movzxbq(rcx, FieldOperand(rax, Map::kInObjectPropertiesOffset));
+    __ subq(rdx, rcx);
+    // Done if no extra properties are to be allocated.
+    __ j(zero, &allocated);
+    __ Assert(positive, "Property allocation count failed.");
 
-  // -------------------------------------------
-  // Dont adapt arguments.
-  // -------------------------------------------
-  __ bind(&dont_adapt_arguments);
-  __ jmp(rdx);
-}
+    // Scale the number of elements by pointer size and add the header for
+    // FixedArrays to the start of the next object calculation from above.
+    // rbx: JSObject
+    // rdi: start of next object (will be start of FixedArray)
+    // rdx: number of elements in properties array
+    __ AllocateInNewSpace(FixedArray::kHeaderSize,
+                          times_pointer_size,
+                          rdx,
+                          rdi,
+                          rax,
+                          no_reg,
+                          &undo_allocation,
+                          RESULT_CONTAINS_TOP);
 
+    // Initialize the FixedArray.
+    // rbx: JSObject
+    // rdi: FixedArray
+    // rdx: number of elements
+    // rax: start of next object
+    __ LoadRoot(rcx, Heap::kFixedArrayMapRootIndex);
+    __ movq(Operand(rdi, HeapObject::kMapOffset), rcx);  // setup the map
+    __ Integer32ToSmi(rdx, rdx);
+    __ movq(Operand(rdi, FixedArray::kLengthOffset), rdx);  // and length
 
-void Builtins::Generate_FunctionCall(MacroAssembler* masm) {
-  // Stack Layout:
-  // rsp[0]:   Return address
-  // rsp[1]:   Argument n
-  // rsp[2]:   Argument n-1
-  //  ...
-  // rsp[n]:   Argument 1
-  // rsp[n+1]: Receiver (function to call)
-  //
-  // rax contains the number of arguments, n, not counting the receiver.
-  //
-  // 1. Make sure we have at least one argument.
-  { Label done;
-    __ testq(rax, rax);
-    __ j(not_zero, &done);
-    __ pop(rbx);
-    __ Push(Factory::undefined_value());
-    __ push(rbx);
-    __ incq(rax);
-    __ bind(&done);
-  }
+    // Initialize the fields to undefined.
+    // rbx: JSObject
+    // rdi: FixedArray
+    // rax: start of next object
+    // rdx: number of elements
+    { Label loop, entry;
+      __ LoadRoot(rdx, Heap::kUndefinedValueRootIndex);
+      __ lea(rcx, Operand(rdi, FixedArray::kHeaderSize));
+      __ jmp(&entry);
+      __ bind(&loop);
+      __ movq(Operand(rcx, 0), rdx);
+      __ addq(rcx, Immediate(kPointerSize));
+      __ bind(&entry);
+      __ cmpq(rcx, rax);
+      __ j(below, &loop);
+    }
 
-  // 2. Get the function to call (passed as receiver) from the stack, check
-  //    if it is a function.
-  Label non_function;
-  // The function to call is at position n+1 on the stack.
-  __ movq(rdi, Operand(rsp, rax, times_pointer_size, 1 * kPointerSize));
-  __ JumpIfSmi(rdi, &non_function);
-  __ CmpObjectType(rdi, JS_FUNCTION_TYPE, rcx);
-  __ j(not_equal, &non_function);
+    // Store the initialized FixedArray into the properties field of
+    // the JSObject
+    // rbx: JSObject
+    // rdi: FixedArray
+    __ or_(rdi, Immediate(kHeapObjectTag));  // add the heap tag
+    __ movq(FieldOperand(rbx, JSObject::kPropertiesOffset), rdi);
 
-  // 3a. Patch the first argument if necessary when calling a function.
-  Label shift_arguments;
-  { Label convert_to_object, use_global_receiver, patch_receiver;
-    // Change context eagerly in case we need the global receiver.
-    __ movq(rsi, FieldOperand(rdi, JSFunction::kContextOffset));
 
-    __ movq(rbx, Operand(rsp, rax, times_pointer_size, 0));
-    __ JumpIfSmi(rbx, &convert_to_object);
+    // Continue with JSObject being successfully allocated
+    // rbx: JSObject
+    __ jmp(&allocated);
 
-    __ CompareRoot(rbx, Heap::kNullValueRootIndex);
-    __ j(equal, &use_global_receiver);
-    __ CompareRoot(rbx, Heap::kUndefinedValueRootIndex);
-    __ j(equal, &use_global_receiver);
+    // Undo the setting of the new top so that the heap is verifiable. For
+    // example, the map's unused properties potentially do not match the
+    // allocated objects unused properties.
+    // rbx: JSObject (previous new top)
+    __ bind(&undo_allocation);
+    __ UndoAllocationInNewSpace(rbx);
+  }
 
-    __ CmpObjectType(rbx, FIRST_JS_OBJECT_TYPE, rcx);
-    __ j(below, &convert_to_object);
-    __ CmpInstanceType(rcx, LAST_JS_OBJECT_TYPE);
-    __ j(below_equal, &shift_arguments);
+  // Allocate the new receiver object using the runtime call.
+  // rdi: function (constructor)
+  __ bind(&rt_call);
+  // Must restore rdi (constructor) before calling runtime.
+  __ movq(rdi, Operand(rsp, 0));
+  __ push(rdi);
+  __ CallRuntime(Runtime::kNewObject, 1);
+  __ movq(rbx, rax);  // store result in rbx
 
-    __ bind(&convert_to_object);
-    __ EnterInternalFrame();  // In order to preserve argument count.
-    __ Integer32ToSmi(rax, rax);
-    __ push(rax);
+  // New object allocated.
+  // rbx: newly allocated object
+  __ bind(&allocated);
+  // Retrieve the function from the stack.
+  __ pop(rdi);
 
-    __ push(rbx);
-    __ InvokeBuiltin(Builtins::TO_OBJECT, CALL_FUNCTION);
-    __ movq(rbx, rax);
+  // Retrieve smi-tagged arguments count from the stack.
+  __ movq(rax, Operand(rsp, 0));
+  __ SmiToInteger32(rax, rax);
 
-    __ pop(rax);
-    __ SmiToInteger32(rax, rax);
-    __ LeaveInternalFrame();
-    // Restore the function to rdi.
-    __ movq(rdi, Operand(rsp, rax, times_pointer_size, 1 * kPointerSize));
-    __ jmp(&patch_receiver);
+  // Push the allocated receiver to the stack. We need two copies
+  // because we may have to return the original one and the calling
+  // conventions dictate that the called function pops the receiver.
+  __ push(rbx);
+  __ push(rbx);
 
-    // Use the global receiver object from the called function as the
-    // receiver.
-    __ bind(&use_global_receiver);
-    const int kGlobalIndex =
-        Context::kHeaderSize + Context::GLOBAL_INDEX * kPointerSize;
-    __ movq(rbx, FieldOperand(rsi, kGlobalIndex));
-    __ movq(rbx, FieldOperand(rbx, GlobalObject::kGlobalContextOffset));
-    __ movq(rbx, FieldOperand(rbx, kGlobalIndex));
-    __ movq(rbx, FieldOperand(rbx, GlobalObject::kGlobalReceiverOffset));
+  // Setup pointer to last argument.
+  __ lea(rbx, Operand(rbp, StandardFrameConstants::kCallerSPOffset));
 
-    __ bind(&patch_receiver);
-    __ movq(Operand(rsp, rax, times_pointer_size, 0), rbx);
+  // Copy arguments and receiver to the expression stack.
+  Label loop, entry;
+  __ movq(rcx, rax);
+  __ jmp(&entry);
+  __ bind(&loop);
+  __ push(Operand(rbx, rcx, times_pointer_size, 0));
+  __ bind(&entry);
+  __ decq(rcx);
+  __ j(greater_equal, &loop);
 
-    __ jmp(&shift_arguments);
+  // Call the function.
+  if (is_api_function) {
+    __ movq(rsi, FieldOperand(rdi, JSFunction::kContextOffset));
+    Handle<Code> code = Handle<Code>(
+        Builtins::builtin(Builtins::HandleApiCallConstruct));
+    ParameterCount expected(0);
+    __ InvokeCode(code, expected, expected,
+                  RelocInfo::CODE_TARGET, CALL_FUNCTION);
+  } else {
+    ParameterCount actual(rax);
+    __ InvokeFunction(rdi, actual, CALL_FUNCTION);
   }
 
+  // Restore context from the frame.
+  __ movq(rsi, Operand(rbp, StandardFrameConstants::kContextOffset));
 
-  // 3b. Patch the first argument when calling a non-function.  The
-  //     CALL_NON_FUNCTION builtin expects the non-function callee as
-  //     receiver, so overwrite the first argument which will ultimately
-  //     become the receiver.
-  __ bind(&non_function);
-  __ movq(Operand(rsp, rax, times_pointer_size, 0), rdi);
-  __ xor_(rdi, rdi);
+  // If the result is an object (in the ECMA sense), we should get rid
+  // of the receiver and use the result; see ECMA-262 section 13.2.2-7
+  // on page 74.
+  Label use_receiver, exit;
+  // If the result is a smi, it is *not* an object in the ECMA sense.
+  __ JumpIfSmi(rax, &use_receiver);
 
-  // 4. Shift arguments and return address one slot down on the stack
-  //    (overwriting the original receiver).  Adjust argument count to make
-  //    the original first argument the new receiver.
-  __ bind(&shift_arguments);
-  { Label loop;
-    __ movq(rcx, rax);
-    __ bind(&loop);
-    __ movq(rbx, Operand(rsp, rcx, times_pointer_size, 0));
-    __ movq(Operand(rsp, rcx, times_pointer_size, 1 * kPointerSize), rbx);
-    __ decq(rcx);
-    __ j(not_sign, &loop);  // While non-negative (to copy return address).
-    __ pop(rbx);  // Discard copy of return address.
-    __ decq(rax);  // One fewer argument (first argument is new receiver).
-  }
+  // If the type of the result (stored in its map) is less than
+  // FIRST_JS_OBJECT_TYPE, it is not an object in the ECMA sense.
+  __ CmpObjectType(rax, FIRST_JS_OBJECT_TYPE, rcx);
+  __ j(above_equal, &exit);
 
-  // 5a. Call non-function via tail call to CALL_NON_FUNCTION builtin.
-  { Label function;
-    __ testq(rdi, rdi);
-    __ j(not_zero, &function);
-    __ xor_(rbx, rbx);
-    __ GetBuiltinEntry(rdx, Builtins::CALL_NON_FUNCTION);
-    __ Jump(Handle<Code>(builtin(ArgumentsAdaptorTrampoline)),
-            RelocInfo::CODE_TARGET);
-    __ bind(&function);
-  }
+  // Throw away the result of the constructor invocation and use the
+  // on-stack receiver as the result.
+  __ bind(&use_receiver);
+  __ movq(rax, Operand(rsp, 0));
 
-  // 5b. Get the code to call from the function and check that the number of
-  //     expected arguments matches what we're providing.  If so, jump
-  //     (tail-call) to the code in register edx without checking arguments.
-  __ movq(rdx, FieldOperand(rdi, JSFunction::kSharedFunctionInfoOffset));
-  __ movsxlq(rbx,
-             FieldOperand(rdx,
-                          SharedFunctionInfo::kFormalParameterCountOffset));
-  __ movq(rdx, FieldOperand(rdi, JSFunction::kCodeEntryOffset));
-  __ cmpq(rax, rbx);
-  __ j(not_equal,
-       Handle<Code>(builtin(ArgumentsAdaptorTrampoline)),
-       RelocInfo::CODE_TARGET);
+  // Restore the arguments count and leave the construct frame.
+  __ bind(&exit);
+  __ movq(rbx, Operand(rsp, kPointerSize));  // get arguments count
+  __ LeaveConstructFrame();
 
-  ParameterCount expected(0);
-  __ InvokeCode(rdx, expected, expected, JUMP_FUNCTION);
+  // Remove caller arguments from the stack and return.
+  __ pop(rcx);
+  SmiIndex index = masm->SmiToIndex(rbx, rbx, kPointerSizeLog2);
+  __ lea(rsp, Operand(rsp, index.reg, index.scale, 1 * kPointerSize));
+  __ push(rcx);
+  __ IncrementCounter(&Counters::constructed_objects, 1);
+  __ ret(0);
 }
 
 
-void Builtins::Generate_FunctionApply(MacroAssembler* masm) {
-  // Stack at entry:
-  //    rsp: return address
-  //  rsp+8: arguments
-  // rsp+16: receiver ("this")
-  // rsp+24: function
-  __ EnterInternalFrame();
-  // Stack frame:
-  //    rbp: Old base pointer
-  // rbp[1]: return address
-  // rbp[2]: function arguments
-  // rbp[3]: receiver
-  // rbp[4]: function
-  static const int kArgumentsOffset = 2 * kPointerSize;
-  static const int kReceiverOffset = 3 * kPointerSize;
-  static const int kFunctionOffset = 4 * kPointerSize;
-  __ push(Operand(rbp, kFunctionOffset));
-  __ push(Operand(rbp, kArgumentsOffset));
-  __ InvokeBuiltin(Builtins::APPLY_PREPARE, CALL_FUNCTION);
+void Builtins::Generate_JSConstructStubCountdown(MacroAssembler* masm) {
+  Generate_JSConstructStubHelper(masm, false, true);
+}
 
-  // Check the stack for overflow. We are not trying need to catch
-  // interruptions (e.g. debug break and preemption) here, so the "real stack
-  // limit" is checked.
-  Label okay;
-  __ LoadRoot(kScratchRegister, Heap::kRealStackLimitRootIndex);
-  __ movq(rcx, rsp);
-  // Make rcx the space we have left. The stack might already be overflowed
-  // here which will cause rcx to become negative.
-  __ subq(rcx, kScratchRegister);
-  // Make rdx the space we need for the array when it is unrolled onto the
-  // stack.
-  __ PositiveSmiTimesPowerOfTwoToInteger64(rdx, rax, kPointerSizeLog2);
-  // Check if the arguments will overflow the stack.
-  __ cmpq(rcx, rdx);
-  __ j(greater, &okay);  // Signed comparison.
 
-  // Out of stack space.
-  __ push(Operand(rbp, kFunctionOffset));
-  __ push(rax);
-  __ InvokeBuiltin(Builtins::APPLY_OVERFLOW, CALL_FUNCTION);
-  __ bind(&okay);
-  // End of stack check.
+void Builtins::Generate_JSConstructStubGeneric(MacroAssembler* masm) {
+  Generate_JSConstructStubHelper(masm, false, false);
+}
 
-  // Push current index and limit.
-  const int kLimitOffset =
-      StandardFrameConstants::kExpressionsOffset - 1 * kPointerSize;
-  const int kIndexOffset = kLimitOffset - 1 * kPointerSize;
-  __ push(rax);  // limit
-  __ push(Immediate(0));  // index
 
-  // Change context eagerly to get the right global object if
-  // necessary.
-  __ movq(rdi, Operand(rbp, kFunctionOffset));
-  __ movq(rsi, FieldOperand(rdi, JSFunction::kContextOffset));
+void Builtins::Generate_JSConstructStubApi(MacroAssembler* masm) {
+  Generate_JSConstructStubHelper(masm, true, false);
+}
 
-  // Compute the receiver.
-  Label call_to_object, use_global_receiver, push_receiver;
-  __ movq(rbx, Operand(rbp, kReceiverOffset));
-  __ JumpIfSmi(rbx, &call_to_object);
-  __ CompareRoot(rbx, Heap::kNullValueRootIndex);
-  __ j(equal, &use_global_receiver);
-  __ CompareRoot(rbx, Heap::kUndefinedValueRootIndex);
-  __ j(equal, &use_global_receiver);
 
-  // If given receiver is already a JavaScript object then there's no
-  // reason for converting it.
-  __ CmpObjectType(rbx, FIRST_JS_OBJECT_TYPE, rcx);
-  __ j(below, &call_to_object);
-  __ CmpInstanceType(rcx, LAST_JS_OBJECT_TYPE);
-  __ j(below_equal, &push_receiver);
+static void Generate_JSEntryTrampolineHelper(MacroAssembler* masm,
+                                             bool is_construct) {
+  // Expects five C++ function parameters.
+  // - Address entry (ignored)
+  // - JSFunction* function (
+  // - Object* receiver
+  // - int argc
+  // - Object*** argv
+  // (see Handle::Invoke in execution.cc).
 
-  // Convert the receiver to an object.
-  __ bind(&call_to_object);
-  __ push(rbx);
-  __ InvokeBuiltin(Builtins::TO_OBJECT, CALL_FUNCTION);
-  __ movq(rbx, rax);
-  __ jmp(&push_receiver);
+  // Platform specific argument handling. After this, the stack contains
+  // an internal frame and the pushed function and receiver, and
+  // register rax and rbx holds the argument count and argument array,
+  // while rdi holds the function pointer and rsi the context.
+#ifdef _WIN64
+  // MSVC parameters in:
+  // rcx : entry (ignored)
+  // rdx : function
+  // r8 : receiver
+  // r9 : argc
+  // [rsp+0x20] : argv
 
-  // Use the current global receiver object as the receiver.
-  __ bind(&use_global_receiver);
-  const int kGlobalOffset =
-      Context::kHeaderSize + Context::GLOBAL_INDEX * kPointerSize;
-  __ movq(rbx, FieldOperand(rsi, kGlobalOffset));
-  __ movq(rbx, FieldOperand(rbx, GlobalObject::kGlobalContextOffset));
-  __ movq(rbx, FieldOperand(rbx, kGlobalOffset));
-  __ movq(rbx, FieldOperand(rbx, GlobalObject::kGlobalReceiverOffset));
+  // Clear the context before we push it when entering the JS frame.
+  __ xor_(rsi, rsi);
+  __ EnterInternalFrame();
 
-  // Push the receiver.
-  __ bind(&push_receiver);
-  __ push(rbx);
+  // Load the function context into rsi.
+  __ movq(rsi, FieldOperand(rdx, JSFunction::kContextOffset));
 
-  // Copy all arguments from the array to the stack.
-  Label entry, loop;
-  __ movq(rax, Operand(rbp, kIndexOffset));
-  __ jmp(&entry);
-  __ bind(&loop);
-  __ movq(rdx, Operand(rbp, kArgumentsOffset));  // load arguments
+  // Push the function and the receiver onto the stack.
+  __ push(rdx);
+  __ push(r8);
 
-  // Use inline caching to speed up access to arguments.
-  Handle<Code> ic(Builtins::builtin(Builtins::KeyedLoadIC_Initialize));
-  __ Call(ic, RelocInfo::CODE_TARGET);
-  // It is important that we do not have a test instruction after the
-  // call.  A test instruction after the call is used to indicate that
-  // we have generated an inline version of the keyed load.  In this
-  // case, we know that we are not generating a test instruction next.
+  // Load the number of arguments and setup pointer to the arguments.
+  __ movq(rax, r9);
+  // Load the previous frame pointer to access C argument on stack
+  __ movq(kScratchRegister, Operand(rbp, 0));
+  __ movq(rbx, Operand(kScratchRegister, EntryFrameConstants::kArgvOffset));
+  // Load the function pointer into rdi.
+  __ movq(rdi, rdx);
+#else  // _WIN64
+  // GCC parameters in:
+  // rdi : entry (ignored)
+  // rsi : function
+  // rdx : receiver
+  // rcx : argc
+  // r8  : argv
 
-  // Push the nth argument.
-  __ push(rax);
+  __ movq(rdi, rsi);
+  // rdi : function
 
-  // Update the index on the stack and in register rax.
-  __ movq(rax, Operand(rbp, kIndexOffset));
-  __ SmiAddConstant(rax, rax, Smi::FromInt(1));
-  __ movq(Operand(rbp, kIndexOffset), rax);
+  // Clear the context before we push it when entering the JS frame.
+  __ xor_(rsi, rsi);
+  // Enter an internal frame.
+  __ EnterInternalFrame();
+
+  // Push the function and receiver and setup the context.
+  __ push(rdi);
+  __ push(rdx);
+  __ movq(rsi, FieldOperand(rdi, JSFunction::kContextOffset));
+
+  // Load the number of arguments and setup pointer to the arguments.
+  __ movq(rax, rcx);
+  __ movq(rbx, r8);
+#endif  // _WIN64
+
+  // Current stack contents:
+  // [rsp + 2 * kPointerSize ... ]: Internal frame
+  // [rsp + kPointerSize]         : function
+  // [rsp]                        : receiver
+  // Current register contents:
+  // rax : argc
+  // rbx : argv
+  // rsi : context
+  // rdi : function
 
+  // Copy arguments to the stack in a loop.
+  // Register rbx points to array of pointers to handle locations.
+  // Push the values of these handles.
+  Label loop, entry;
+  __ xor_(rcx, rcx);  // Set loop variable to 0.
+  __ jmp(&entry);
+  __ bind(&loop);
+  __ movq(kScratchRegister, Operand(rbx, rcx, times_pointer_size, 0));
+  __ push(Operand(kScratchRegister, 0));  // dereference handle
+  __ addq(rcx, Immediate(1));
   __ bind(&entry);
-  __ cmpq(rax, Operand(rbp, kLimitOffset));
+  __ cmpq(rcx, rax);
   __ j(not_equal, &loop);
 
-  // Invoke the function.
-  ParameterCount actual(rax);
-  __ SmiToInteger32(rax, rax);
-  __ movq(rdi, Operand(rbp, kFunctionOffset));
-  __ InvokeFunction(rdi, actual, CALL_FUNCTION);
+  // Invoke the code.
+  if (is_construct) {
+    // Expects rdi to hold function pointer.
+    __ Call(Handle<Code>(Builtins::builtin(Builtins::JSConstructCall)),
+            RelocInfo::CODE_TARGET);
+  } else {
+    ParameterCount actual(rax);
+    // Function must be in rdi.
+    __ InvokeFunction(rdi, actual, CALL_FUNCTION);
+  }
 
+  // Exit the JS frame. Notice that this also removes the empty
+  // context and the function left on the stack by the code
+  // invocation.
   __ LeaveInternalFrame();
-  __ ret(3 * kPointerSize);  // remove function, receiver, and arguments
+  // TODO(X64): Is argument correct? Is there a receiver to remove?
+  __ ret(1 * kPointerSize);  // remove receiver
 }
 
 
-// Load the built-in Array function from the current context.
-static void GenerateLoadArrayFunction(MacroAssembler* masm, Register result) {
-  // Load the global context.
-  __ movq(result, Operand(rsi, Context::SlotOffset(Context::GLOBAL_INDEX)));
-  __ movq(result, FieldOperand(result, GlobalObject::kGlobalContextOffset));
-  // Load the Array function from the global context.
-  __ movq(result,
-          Operand(result, Context::SlotOffset(Context::ARRAY_FUNCTION_INDEX)));
+void Builtins::Generate_JSEntryTrampoline(MacroAssembler* masm) {
+  Generate_JSEntryTrampolineHelper(masm, false);
 }
 
 
-// Number of empty elements to allocate for an empty array.
-static const int kPreallocatedArrayElements = 4;
+void Builtins::Generate_JSConstructEntryTrampoline(MacroAssembler* masm) {
+  Generate_JSEntryTrampolineHelper(masm, true);
+}
 
 
-// Allocate an empty JSArray. The allocated array is put into the result
-// register. If the parameter initial_capacity is larger than zero an elements
-// backing store is allocated with this size and filled with the hole values.
-// Otherwise the elements backing store is set to the empty FixedArray.
-static void AllocateEmptyJSArray(MacroAssembler* masm,
-                                 Register array_function,
-                                 Register result,
-                                 Register scratch1,
-                                 Register scratch2,
-                                 Register scratch3,
-                                 int initial_capacity,
-                                 Label* gc_required) {
-  ASSERT(initial_capacity >= 0);
+void Builtins::Generate_LazyCompile(MacroAssembler* masm) {
+  // Enter an internal frame.
+  __ EnterInternalFrame();
 
-  // Load the initial map from the array function.
-  __ movq(scratch1, FieldOperand(array_function,
-                                 JSFunction::kPrototypeOrInitialMapOffset));
+  // Push a copy of the function onto the stack.
+  __ push(rdi);
 
-  // Allocate the JSArray object together with space for a fixed array with the
-  // requested elements.
-  int size = JSArray::kSize;
-  if (initial_capacity > 0) {
-    size += FixedArray::SizeFor(initial_capacity);
-  }
-  __ AllocateInNewSpace(size,
-                        result,
-                        scratch2,
-                        scratch3,
-                        gc_required,
-                        TAG_OBJECT);
+  __ push(rdi);  // Function is also the parameter to the runtime call.
+  __ CallRuntime(Runtime::kLazyCompile, 1);
+  __ pop(rdi);
 
-  // Allocated the JSArray. Now initialize the fields except for the elements
-  // array.
-  // result: JSObject
-  // scratch1: initial map
-  // scratch2: start of next object
-  __ movq(FieldOperand(result, JSObject::kMapOffset), scratch1);
-  __ Move(FieldOperand(result, JSArray::kPropertiesOffset),
-          Factory::empty_fixed_array());
-  // Field JSArray::kElementsOffset is initialized later.
-  __ Move(FieldOperand(result, JSArray::kLengthOffset), Smi::FromInt(0));
+  // Tear down temporary frame.
+  __ LeaveInternalFrame();
 
-  // If no storage is requested for the elements array just set the empty
-  // fixed array.
-  if (initial_capacity == 0) {
-    __ Move(FieldOperand(result, JSArray::kElementsOffset),
-            Factory::empty_fixed_array());
-    return;
-  }
+  // Do a tail-call of the compiled function.
+  __ lea(rcx, FieldOperand(rax, Code::kHeaderSize));
+  __ jmp(rcx);
+}
 
-  // Calculate the location of the elements array and set elements array member
-  // of the JSArray.
-  // result: JSObject
-  // scratch2: start of next object
-  __ lea(scratch1, Operand(result, JSArray::kSize));
-  __ movq(FieldOperand(result, JSArray::kElementsOffset), scratch1);
 
-  // Initialize the FixedArray and fill it with holes. FixedArray length is
-  // stored as a smi.
-  // result: JSObject
-  // scratch1: elements array
-  // scratch2: start of next object
-  __ Move(FieldOperand(scratch1, HeapObject::kMapOffset),
-          Factory::fixed_array_map());
-  __ Move(FieldOperand(scratch1, FixedArray::kLengthOffset),
-          Smi::FromInt(initial_capacity));
+void Builtins::Generate_LazyRecompile(MacroAssembler* masm) {
+  // Enter an internal frame.
+  __ EnterInternalFrame();
 
-  // Fill the FixedArray with the hole value. Inline the code if short.
-  // Reconsider loop unfolding if kPreallocatedArrayElements gets changed.
-  static const int kLoopUnfoldLimit = 4;
-  ASSERT(kPreallocatedArrayElements <= kLoopUnfoldLimit);
-  __ Move(scratch3, Factory::the_hole_value());
-  if (initial_capacity <= kLoopUnfoldLimit) {
-    // Use a scratch register here to have only one reloc info when unfolding
-    // the loop.
-    for (int i = 0; i < initial_capacity; i++) {
-      __ movq(FieldOperand(scratch1,
-                           FixedArray::kHeaderSize + i * kPointerSize),
-              scratch3);
-    }
-  } else {
-    Label loop, entry;
-    __ jmp(&entry);
-    __ bind(&loop);
-    __ movq(Operand(scratch1, 0), scratch3);
-    __ addq(scratch1, Immediate(kPointerSize));
-    __ bind(&entry);
-    __ cmpq(scratch1, scratch2);
-    __ j(below, &loop);
-  }
-}
+  // Push a copy of the function onto the stack.
+  __ push(rdi);
 
+  __ push(rdi);  // Function is also the parameter to the runtime call.
+  __ CallRuntime(Runtime::kLazyRecompile, 1);
 
-// Allocate a JSArray with the number of elements stored in a register. The
-// register array_function holds the built-in Array function and the register
-// array_size holds the size of the array as a smi. The allocated array is put
-// into the result register and beginning and end of the FixedArray elements
-// storage is put into registers elements_array and elements_array_end  (see
-// below for when that is not the case). If the parameter fill_with_holes is
-// true the allocated elements backing store is filled with the hole values
-// otherwise it is left uninitialized. When the backing store is filled the
-// register elements_array is scratched.
-static void AllocateJSArray(MacroAssembler* masm,
-                            Register array_function,  // Array function.
-                            Register array_size,  // As a smi.
-                            Register result,
-                            Register elements_array,
-                            Register elements_array_end,
-                            Register scratch,
-                            bool fill_with_hole,
-                            Label* gc_required) {
-  Label not_empty, allocated;
+  // Restore function and tear down temporary frame.
+  __ pop(rdi);
+  __ LeaveInternalFrame();
 
-  // Load the initial map from the array function.
-  __ movq(elements_array,
-          FieldOperand(array_function,
-                       JSFunction::kPrototypeOrInitialMapOffset));
+  // Do a tail-call of the compiled function.
+  __ lea(rcx, FieldOperand(rax, Code::kHeaderSize));
+  __ jmp(rcx);
+}
 
-  // Check whether an empty sized array is requested.
-  __ testq(array_size, array_size);
-  __ j(not_zero, &not_empty);
 
-  // If an empty array is requested allocate a small elements array anyway. This
-  // keeps the code below free of special casing for the empty array.
-  int size = JSArray::kSize + FixedArray::SizeFor(kPreallocatedArrayElements);
-  __ AllocateInNewSpace(size,
-                        result,
-                        elements_array_end,
-                        scratch,
-                        gc_required,
-                        TAG_OBJECT);
-  __ jmp(&allocated);
+static void Generate_NotifyDeoptimizedHelper(MacroAssembler* masm,
+                                             Deoptimizer::BailoutType type) {
+  __ int3();
+}
 
-  // Allocate the JSArray object together with space for a FixedArray with the
-  // requested elements.
-  __ bind(&not_empty);
-  SmiIndex index =
-      masm->SmiToIndex(kScratchRegister, array_size, kPointerSizeLog2);
-  __ AllocateInNewSpace(JSArray::kSize + FixedArray::kHeaderSize,
-                        index.scale,
-                        index.reg,
-                        result,
-                        elements_array_end,
-                        scratch,
-                        gc_required,
-                        TAG_OBJECT);
+void Builtins::Generate_NotifyDeoptimized(MacroAssembler* masm) {
+  Generate_NotifyDeoptimizedHelper(masm, Deoptimizer::EAGER);
+}
 
-  // Allocated the JSArray. Now initialize the fields except for the elements
-  // array.
-  // result: JSObject
-  // elements_array: initial map
-  // elements_array_end: start of next object
-  // array_size: size of array (smi)
-  __ bind(&allocated);
-  __ movq(FieldOperand(result, JSObject::kMapOffset), elements_array);
-  __ Move(elements_array, Factory::empty_fixed_array());
-  __ movq(FieldOperand(result, JSArray::kPropertiesOffset), elements_array);
-  // Field JSArray::kElementsOffset is initialized later.
-  __ movq(FieldOperand(result, JSArray::kLengthOffset), array_size);
 
-  // Calculate the location of the elements array and set elements array member
-  // of the JSArray.
-  // result: JSObject
-  // elements_array_end: start of next object
-  // array_size: size of array (smi)
-  __ lea(elements_array, Operand(result, JSArray::kSize));
-  __ movq(FieldOperand(result, JSArray::kElementsOffset), elements_array);
+void Builtins::Generate_NotifyLazyDeoptimized(MacroAssembler* masm) {
+  Generate_NotifyDeoptimizedHelper(masm, Deoptimizer::EAGER);
+}
 
-  // Initialize the fixed array. FixedArray length is stored as a smi.
-  // result: JSObject
-  // elements_array: elements array
-  // elements_array_end: start of next object
-  // array_size: size of array (smi)
-  __ Move(FieldOperand(elements_array, JSObject::kMapOffset),
-          Factory::fixed_array_map());
-  Label not_empty_2, fill_array;
-  __ SmiTest(array_size);
-  __ j(not_zero, &not_empty_2);
-  // Length of the FixedArray is the number of pre-allocated elements even
-  // though the actual JSArray has length 0.
-  __ Move(FieldOperand(elements_array, FixedArray::kLengthOffset),
-          Smi::FromInt(kPreallocatedArrayElements));
-  __ jmp(&fill_array);
-  __ bind(&not_empty_2);
-  // For non-empty JSArrays the length of the FixedArray and the JSArray is the
-  // same.
-  __ movq(FieldOperand(elements_array, FixedArray::kLengthOffset), array_size);
 
-  // Fill the allocated FixedArray with the hole value if requested.
-  // result: JSObject
-  // elements_array: elements array
-  // elements_array_end: start of next object
-  __ bind(&fill_array);
-  if (fill_with_hole) {
-    Label loop, entry;
-    __ Move(scratch, Factory::the_hole_value());
-    __ lea(elements_array, Operand(elements_array,
-                                   FixedArray::kHeaderSize - kHeapObjectTag));
-    __ jmp(&entry);
-    __ bind(&loop);
-    __ movq(Operand(elements_array, 0), scratch);
-    __ addq(elements_array, Immediate(kPointerSize));
-    __ bind(&entry);
-    __ cmpq(elements_array, elements_array_end);
-    __ j(below, &loop);
-  }
+void Builtins::Generate_NotifyOSR(MacroAssembler* masm) {
+  __ int3();
 }
 
 
-// Create a new array for the built-in Array function. This function allocates
-// the JSArray object and the FixedArray elements array and initializes these.
-// If the Array cannot be constructed in native code the runtime is called. This
-// function assumes the following state:
-//   rdi: constructor (built-in Array function)
-//   rax: argc
-//   rsp[0]: return address
-//   rsp[8]: last argument
-// This function is used for both construct and normal calls of Array. The only
-// difference between handling a construct call and a normal call is that for a
-// construct call the constructor function in rdi needs to be preserved for
-// entering the generic code. In both cases argc in rax needs to be preserved.
-// Both registers are preserved by this code so no need to differentiate between
-// a construct call and a normal call.
-static void ArrayNativeCode(MacroAssembler* masm,
-                            Label *call_generic_code) {
-  Label argc_one_or_more, argc_two_or_more;
+void Builtins::Generate_FunctionCall(MacroAssembler* masm) {
+  // Stack Layout:
+  // rsp[0]:   Return address
+  // rsp[1]:   Argument n
+  // rsp[2]:   Argument n-1
+  //  ...
+  // rsp[n]:   Argument 1
+  // rsp[n+1]: Receiver (function to call)
+  //
+  // rax contains the number of arguments, n, not counting the receiver.
+  //
+  // 1. Make sure we have at least one argument.
+  { Label done;
+    __ testq(rax, rax);
+    __ j(not_zero, &done);
+    __ pop(rbx);
+    __ Push(Factory::undefined_value());
+    __ push(rbx);
+    __ incq(rax);
+    __ bind(&done);
+  }
 
-  // Check for array construction with zero arguments.
-  __ testq(rax, rax);
-  __ j(not_zero, &argc_one_or_more);
+  // 2. Get the function to call (passed as receiver) from the stack, check
+  //    if it is a function.
+  Label non_function;
+  // The function to call is at position n+1 on the stack.
+  __ movq(rdi, Operand(rsp, rax, times_pointer_size, 1 * kPointerSize));
+  __ JumpIfSmi(rdi, &non_function);
+  __ CmpObjectType(rdi, JS_FUNCTION_TYPE, rcx);
+  __ j(not_equal, &non_function);
 
-  // Handle construction of an empty array.
-  AllocateEmptyJSArray(masm,
-                       rdi,
-                       rbx,
-                       rcx,
-                       rdx,
-                       r8,
-                       kPreallocatedArrayElements,
-                       call_generic_code);
-  __ IncrementCounter(&Counters::array_function_native, 1);
-  __ movq(rax, rbx);
-  __ ret(kPointerSize);
+  // 3a. Patch the first argument if necessary when calling a function.
+  Label shift_arguments;
+  { Label convert_to_object, use_global_receiver, patch_receiver;
+    // Change context eagerly in case we need the global receiver.
+    __ movq(rsi, FieldOperand(rdi, JSFunction::kContextOffset));
 
-  // Check for one argument. Bail out if argument is not smi or if it is
-  // negative.
-  __ bind(&argc_one_or_more);
-  __ cmpq(rax, Immediate(1));
-  __ j(not_equal, &argc_two_or_more);
-  __ movq(rdx, Operand(rsp, kPointerSize));  // Get the argument from the stack.
-  __ JumpUnlessNonNegativeSmi(rdx, call_generic_code);
+    __ movq(rbx, Operand(rsp, rax, times_pointer_size, 0));
+    __ JumpIfSmi(rbx, &convert_to_object);
 
-  // Handle construction of an empty array of a certain size. Bail out if size
-  // is to large to actually allocate an elements array.
-  __ SmiCompare(rdx, Smi::FromInt(JSObject::kInitialMaxFastElementArray));
-  __ j(greater_equal, call_generic_code);
+    __ CompareRoot(rbx, Heap::kNullValueRootIndex);
+    __ j(equal, &use_global_receiver);
+    __ CompareRoot(rbx, Heap::kUndefinedValueRootIndex);
+    __ j(equal, &use_global_receiver);
 
-  // rax: argc
-  // rdx: array_size (smi)
-  // rdi: constructor
-  // esp[0]: return address
-  // esp[8]: argument
-  AllocateJSArray(masm,
-                  rdi,
-                  rdx,
-                  rbx,
-                  rcx,
-                  r8,
-                  r9,
-                  true,
-                  call_generic_code);
-  __ IncrementCounter(&Counters::array_function_native, 1);
-  __ movq(rax, rbx);
-  __ ret(2 * kPointerSize);
+    __ CmpObjectType(rbx, FIRST_JS_OBJECT_TYPE, rcx);
+    __ j(below, &convert_to_object);
+    __ CmpInstanceType(rcx, LAST_JS_OBJECT_TYPE);
+    __ j(below_equal, &shift_arguments);
 
-  // Handle construction of an array from a list of arguments.
-  __ bind(&argc_two_or_more);
-  __ movq(rdx, rax);
-  __ Integer32ToSmi(rdx, rdx);  // Convet argc to a smi.
-  // rax: argc
-  // rdx: array_size (smi)
-  // rdi: constructor
-  // esp[0] : return address
-  // esp[8] : last argument
-  AllocateJSArray(masm,
-                  rdi,
-                  rdx,
-                  rbx,
-                  rcx,
-                  r8,
-                  r9,
-                  false,
-                  call_generic_code);
-  __ IncrementCounter(&Counters::array_function_native, 1);
+    __ bind(&convert_to_object);
+    __ EnterInternalFrame();  // In order to preserve argument count.
+    __ Integer32ToSmi(rax, rax);
+    __ push(rax);
 
-  // rax: argc
-  // rbx: JSArray
-  // rcx: elements_array
-  // r8: elements_array_end (untagged)
-  // esp[0]: return address
-  // esp[8]: last argument
+    __ push(rbx);
+    __ InvokeBuiltin(Builtins::TO_OBJECT, CALL_FUNCTION);
+    __ movq(rbx, rax);
 
-  // Location of the last argument
-  __ lea(r9, Operand(rsp, kPointerSize));
+    __ pop(rax);
+    __ SmiToInteger32(rax, rax);
+    __ LeaveInternalFrame();
+    // Restore the function to rdi.
+    __ movq(rdi, Operand(rsp, rax, times_pointer_size, 1 * kPointerSize));
+    __ jmp(&patch_receiver);
 
-  // Location of the first array element (Parameter fill_with_holes to
-  // AllocateJSArrayis false, so the FixedArray is returned in rcx).
-  __ lea(rdx, Operand(rcx, FixedArray::kHeaderSize - kHeapObjectTag));
+    // Use the global receiver object from the called function as the
+    // receiver.
+    __ bind(&use_global_receiver);
+    const int kGlobalIndex =
+        Context::kHeaderSize + Context::GLOBAL_INDEX * kPointerSize;
+    __ movq(rbx, FieldOperand(rsi, kGlobalIndex));
+    __ movq(rbx, FieldOperand(rbx, GlobalObject::kGlobalContextOffset));
+    __ movq(rbx, FieldOperand(rbx, kGlobalIndex));
+    __ movq(rbx, FieldOperand(rbx, GlobalObject::kGlobalReceiverOffset));
 
-  // rax: argc
-  // rbx: JSArray
-  // rdx: location of the first array element
-  // r9: location of the last argument
-  // esp[0]: return address
-  // esp[8]: last argument
-  Label loop, entry;
-  __ movq(rcx, rax);
-  __ jmp(&entry);
-  __ bind(&loop);
-  __ movq(kScratchRegister, Operand(r9, rcx, times_pointer_size, 0));
-  __ movq(Operand(rdx, 0), kScratchRegister);
-  __ addq(rdx, Immediate(kPointerSize));
-  __ bind(&entry);
-  __ decq(rcx);
-  __ j(greater_equal, &loop);
+    __ bind(&patch_receiver);
+    __ movq(Operand(rsp, rax, times_pointer_size, 0), rbx);
 
-  // Remove caller arguments from the stack and return.
-  // rax: argc
-  // rbx: JSArray
-  // esp[0]: return address
-  // esp[8]: last argument
-  __ pop(rcx);
-  __ lea(rsp, Operand(rsp, rax, times_pointer_size, 1 * kPointerSize));
-  __ push(rcx);
-  __ movq(rax, rbx);
-  __ ret(0);
-}
+    __ jmp(&shift_arguments);
+  }
 
 
-void Builtins::Generate_ArrayCode(MacroAssembler* masm) {
-  // ----------- S t a t e -------------
-  //  -- rax : argc
-  //  -- rsp[0] : return address
-  //  -- rsp[8] : last argument
-  // -----------------------------------
-  Label generic_array_code;
+  // 3b. Patch the first argument when calling a non-function.  The
+  //     CALL_NON_FUNCTION builtin expects the non-function callee as
+  //     receiver, so overwrite the first argument which will ultimately
+  //     become the receiver.
+  __ bind(&non_function);
+  __ movq(Operand(rsp, rax, times_pointer_size, 0), rdi);
+  __ xor_(rdi, rdi);
 
-  // Get the Array function.
-  GenerateLoadArrayFunction(masm, rdi);
+  // 4. Shift arguments and return address one slot down on the stack
+  //    (overwriting the original receiver).  Adjust argument count to make
+  //    the original first argument the new receiver.
+  __ bind(&shift_arguments);
+  { Label loop;
+    __ movq(rcx, rax);
+    __ bind(&loop);
+    __ movq(rbx, Operand(rsp, rcx, times_pointer_size, 0));
+    __ movq(Operand(rsp, rcx, times_pointer_size, 1 * kPointerSize), rbx);
+    __ decq(rcx);
+    __ j(not_sign, &loop);  // While non-negative (to copy return address).
+    __ pop(rbx);  // Discard copy of return address.
+    __ decq(rax);  // One fewer argument (first argument is new receiver).
+  }
 
-  if (FLAG_debug_code) {
-    // Initial map for the builtin Array function shoud be a map.
-    __ movq(rbx, FieldOperand(rdi, JSFunction::kPrototypeOrInitialMapOffset));
-    // Will both indicate a NULL and a Smi.
-    ASSERT(kSmiTag == 0);
-    Condition not_smi = NegateCondition(masm->CheckSmi(rbx));
-    __ Check(not_smi, "Unexpected initial map for Array function");
-    __ CmpObjectType(rbx, MAP_TYPE, rcx);
-    __ Check(equal, "Unexpected initial map for Array function");
+  // 5a. Call non-function via tail call to CALL_NON_FUNCTION builtin.
+  { Label function;
+    __ testq(rdi, rdi);
+    __ j(not_zero, &function);
+    __ xor_(rbx, rbx);
+    __ GetBuiltinEntry(rdx, Builtins::CALL_NON_FUNCTION);
+    __ Jump(Handle<Code>(builtin(ArgumentsAdaptorTrampoline)),
+            RelocInfo::CODE_TARGET);
+    __ bind(&function);
   }
 
-  // Run the native code for the Array function called as a normal function.
-  ArrayNativeCode(masm, &generic_array_code);
+  // 5b. Get the code to call from the function and check that the number of
+  //     expected arguments matches what we're providing.  If so, jump
+  //     (tail-call) to the code in register edx without checking arguments.
+  __ movq(rdx, FieldOperand(rdi, JSFunction::kSharedFunctionInfoOffset));
+  __ movsxlq(rbx,
+             FieldOperand(rdx,
+                          SharedFunctionInfo::kFormalParameterCountOffset));
+  __ movq(rdx, FieldOperand(rdi, JSFunction::kCodeEntryOffset));
+  __ cmpq(rax, rbx);
+  __ j(not_equal,
+       Handle<Code>(builtin(ArgumentsAdaptorTrampoline)),
+       RelocInfo::CODE_TARGET);
 
-  // Jump to the generic array code in case the specialized code cannot handle
-  // the construction.
-  __ bind(&generic_array_code);
-  Code* code = Builtins::builtin(Builtins::ArrayCodeGeneric);
-  Handle<Code> array_code(code);
-  __ Jump(array_code, RelocInfo::CODE_TARGET);
+  ParameterCount expected(0);
+  __ InvokeCode(rdx, expected, expected, JUMP_FUNCTION);
 }
 
 
-void Builtins::Generate_ArrayConstructCode(MacroAssembler* masm) {
-  // ----------- S t a t e -------------
-  //  -- rax : argc
-  //  -- rdi : constructor
-  //  -- rsp[0] : return address
-  //  -- rsp[8] : last argument
-  // -----------------------------------
-  Label generic_constructor;
-
-  if (FLAG_debug_code) {
-    // The array construct code is only set for the builtin Array function which
-    // does always have a map.
-    GenerateLoadArrayFunction(masm, rbx);
-    __ cmpq(rdi, rbx);
-    __ Check(equal, "Unexpected Array function");
-    // Initial map for the builtin Array function should be a map.
-    __ movq(rbx, FieldOperand(rdi, JSFunction::kPrototypeOrInitialMapOffset));
-    // Will both indicate a NULL and a Smi.
-    ASSERT(kSmiTag == 0);
-    Condition not_smi = NegateCondition(masm->CheckSmi(rbx));
-    __ Check(not_smi, "Unexpected initial map for Array function");
-    __ CmpObjectType(rbx, MAP_TYPE, rcx);
-    __ Check(equal, "Unexpected initial map for Array function");
-  }
+void Builtins::Generate_FunctionApply(MacroAssembler* masm) {
+  // Stack at entry:
+  //    rsp: return address
+  //  rsp+8: arguments
+  // rsp+16: receiver ("this")
+  // rsp+24: function
+  __ EnterInternalFrame();
+  // Stack frame:
+  //    rbp: Old base pointer
+  // rbp[1]: return address
+  // rbp[2]: function arguments
+  // rbp[3]: receiver
+  // rbp[4]: function
+  static const int kArgumentsOffset = 2 * kPointerSize;
+  static const int kReceiverOffset = 3 * kPointerSize;
+  static const int kFunctionOffset = 4 * kPointerSize;
+  __ push(Operand(rbp, kFunctionOffset));
+  __ push(Operand(rbp, kArgumentsOffset));
+  __ InvokeBuiltin(Builtins::APPLY_PREPARE, CALL_FUNCTION);
 
-  // Run the native code for the Array function called as constructor.
-  ArrayNativeCode(masm, &generic_constructor);
+  // Check the stack for overflow. We are not trying need to catch
+  // interruptions (e.g. debug break and preemption) here, so the "real stack
+  // limit" is checked.
+  Label okay;
+  __ LoadRoot(kScratchRegister, Heap::kRealStackLimitRootIndex);
+  __ movq(rcx, rsp);
+  // Make rcx the space we have left. The stack might already be overflowed
+  // here which will cause rcx to become negative.
+  __ subq(rcx, kScratchRegister);
+  // Make rdx the space we need for the array when it is unrolled onto the
+  // stack.
+  __ PositiveSmiTimesPowerOfTwoToInteger64(rdx, rax, kPointerSizeLog2);
+  // Check if the arguments will overflow the stack.
+  __ cmpq(rcx, rdx);
+  __ j(greater, &okay);  // Signed comparison.
 
-  // Jump to the generic construct code in case the specialized code cannot
-  // handle the construction.
-  __ bind(&generic_constructor);
-  Code* code = Builtins::builtin(Builtins::JSConstructStubGeneric);
-  Handle<Code> generic_construct_stub(code);
-  __ Jump(generic_construct_stub, RelocInfo::CODE_TARGET);
-}
+  // Out of stack space.
+  __ push(Operand(rbp, kFunctionOffset));
+  __ push(rax);
+  __ InvokeBuiltin(Builtins::APPLY_OVERFLOW, CALL_FUNCTION);
+  __ bind(&okay);
+  // End of stack check.
 
+  // Push current index and limit.
+  const int kLimitOffset =
+      StandardFrameConstants::kExpressionsOffset - 1 * kPointerSize;
+  const int kIndexOffset = kLimitOffset - 1 * kPointerSize;
+  __ push(rax);  // limit
+  __ push(Immediate(0));  // index
 
-void Builtins::Generate_StringConstructCode(MacroAssembler* masm) {
-  // TODO(849): implement custom construct stub.
-  // Generate a copy of the generic stub for now.
-  Generate_JSConstructStubGeneric(masm);
-}
+  // Change context eagerly to get the right global object if
+  // necessary.
+  __ movq(rdi, Operand(rbp, kFunctionOffset));
+  __ movq(rsi, FieldOperand(rdi, JSFunction::kContextOffset));
 
+  // Compute the receiver.
+  Label call_to_object, use_global_receiver, push_receiver;
+  __ movq(rbx, Operand(rbp, kReceiverOffset));
+  __ JumpIfSmi(rbx, &call_to_object);
+  __ CompareRoot(rbx, Heap::kNullValueRootIndex);
+  __ j(equal, &use_global_receiver);
+  __ CompareRoot(rbx, Heap::kUndefinedValueRootIndex);
+  __ j(equal, &use_global_receiver);
 
-void Builtins::Generate_JSConstructCall(MacroAssembler* masm) {
-  // ----------- S t a t e -------------
-  //  -- rax: number of arguments
-  //  -- rdi: constructor function
-  // -----------------------------------
+  // If given receiver is already a JavaScript object then there's no
+  // reason for converting it.
+  __ CmpObjectType(rbx, FIRST_JS_OBJECT_TYPE, rcx);
+  __ j(below, &call_to_object);
+  __ CmpInstanceType(rcx, LAST_JS_OBJECT_TYPE);
+  __ j(below_equal, &push_receiver);
 
-  Label non_function_call;
-  // Check that function is not a smi.
-  __ JumpIfSmi(rdi, &non_function_call);
-  // Check that function is a JSFunction.
-  __ CmpObjectType(rdi, JS_FUNCTION_TYPE, rcx);
-  __ j(not_equal, &non_function_call);
-
-  // Jump to the function-specific construct stub.
-  __ movq(rbx, FieldOperand(rdi, JSFunction::kSharedFunctionInfoOffset));
-  __ movq(rbx, FieldOperand(rbx, SharedFunctionInfo::kConstructStubOffset));
-  __ lea(rbx, FieldOperand(rbx, Code::kHeaderSize));
-  __ jmp(rbx);
+  // Convert the receiver to an object.
+  __ bind(&call_to_object);
+  __ push(rbx);
+  __ InvokeBuiltin(Builtins::TO_OBJECT, CALL_FUNCTION);
+  __ movq(rbx, rax);
+  __ jmp(&push_receiver);
 
-  // rdi: called object
-  // rax: number of arguments
-  __ bind(&non_function_call);
-  // Set expected number of arguments to zero (not changing rax).
-  __ movq(rbx, Immediate(0));
-  __ GetBuiltinEntry(rdx, Builtins::CALL_NON_FUNCTION_AS_CONSTRUCTOR);
-  __ Jump(Handle<Code>(builtin(ArgumentsAdaptorTrampoline)),
-          RelocInfo::CODE_TARGET);
-}
+  // Use the current global receiver object as the receiver.
+  __ bind(&use_global_receiver);
+  const int kGlobalOffset =
+      Context::kHeaderSize + Context::GLOBAL_INDEX * kPointerSize;
+  __ movq(rbx, FieldOperand(rsi, kGlobalOffset));
+  __ movq(rbx, FieldOperand(rbx, GlobalObject::kGlobalContextOffset));
+  __ movq(rbx, FieldOperand(rbx, kGlobalOffset));
+  __ movq(rbx, FieldOperand(rbx, GlobalObject::kGlobalReceiverOffset));
 
+  // Push the receiver.
+  __ bind(&push_receiver);
+  __ push(rbx);
 
-static void Generate_JSConstructStubHelper(MacroAssembler* masm,
-                                           bool is_api_function,
-                                           bool count_constructions) {
-  // Should never count constructions for api objects.
-  ASSERT(!is_api_function || !count_constructions);
+  // Copy all arguments from the array to the stack.
+  Label entry, loop;
+  __ movq(rax, Operand(rbp, kIndexOffset));
+  __ jmp(&entry);
+  __ bind(&loop);
+  __ movq(rdx, Operand(rbp, kArgumentsOffset));  // load arguments
 
-    // Enter a construct frame.
-  __ EnterConstructFrame();
+  // Use inline caching to speed up access to arguments.
+  Handle<Code> ic(Builtins::builtin(Builtins::KeyedLoadIC_Initialize));
+  __ Call(ic, RelocInfo::CODE_TARGET);
+  // It is important that we do not have a test instruction after the
+  // call.  A test instruction after the call is used to indicate that
+  // we have generated an inline version of the keyed load.  In this
+  // case, we know that we are not generating a test instruction next.
 
-  // Store a smi-tagged arguments count on the stack.
-  __ Integer32ToSmi(rax, rax);
+  // Push the nth argument.
   __ push(rax);
 
-  // Push the function to invoke on the stack.
-  __ push(rdi);
+  // Update the index on the stack and in register rax.
+  __ movq(rax, Operand(rbp, kIndexOffset));
+  __ SmiAddConstant(rax, rax, Smi::FromInt(1));
+  __ movq(Operand(rbp, kIndexOffset), rax);
 
-  // Try to allocate the object without transitioning into C code. If any of the
-  // preconditions is not met, the code bails out to the runtime call.
-  Label rt_call, allocated;
-  if (FLAG_inline_new) {
-    Label undo_allocation;
+  __ bind(&entry);
+  __ cmpq(rax, Operand(rbp, kLimitOffset));
+  __ j(not_equal, &loop);
 
-#ifdef ENABLE_DEBUGGER_SUPPORT
-    ExternalReference debug_step_in_fp =
-        ExternalReference::debug_step_in_fp_address();
-    __ movq(kScratchRegister, debug_step_in_fp);
-    __ cmpq(Operand(kScratchRegister, 0), Immediate(0));
-    __ j(not_equal, &rt_call);
-#endif
+  // Invoke the function.
+  ParameterCount actual(rax);
+  __ SmiToInteger32(rax, rax);
+  __ movq(rdi, Operand(rbp, kFunctionOffset));
+  __ InvokeFunction(rdi, actual, CALL_FUNCTION);
 
-    // Verified that the constructor is a JSFunction.
-    // Load the initial map and verify that it is in fact a map.
-    // rdi: constructor
-    __ movq(rax, FieldOperand(rdi, JSFunction::kPrototypeOrInitialMapOffset));
-    // Will both indicate a NULL and a Smi
-    ASSERT(kSmiTag == 0);
-    __ JumpIfSmi(rax, &rt_call);
-    // rdi: constructor
-    // rax: initial map (if proven valid below)
-    __ CmpObjectType(rax, MAP_TYPE, rbx);
-    __ j(not_equal, &rt_call);
+  __ LeaveInternalFrame();
+  __ ret(3 * kPointerSize);  // remove function, receiver, and arguments
+}
 
-    // Check that the constructor is not constructing a JSFunction (see comments
-    // in Runtime_NewObject in runtime.cc). In which case the initial map's
-    // instance type would be JS_FUNCTION_TYPE.
-    // rdi: constructor
-    // rax: initial map
-    __ CmpInstanceType(rax, JS_FUNCTION_TYPE);
-    __ j(equal, &rt_call);
 
-    if (count_constructions) {
-      Label allocate;
-      // Decrease generous allocation count.
-      __ movq(rcx, FieldOperand(rdi, JSFunction::kSharedFunctionInfoOffset));
-      __ decb(FieldOperand(rcx, SharedFunctionInfo::kConstructionCountOffset));
-      __ j(not_zero, &allocate);
+// Number of empty elements to allocate for an empty array.
+static const int kPreallocatedArrayElements = 4;
 
-      __ push(rax);
-      __ push(rdi);
 
-      __ push(rdi);  // constructor
-      // The call will replace the stub, so the countdown is only done once.
-      __ CallRuntime(Runtime::kFinalizeInstanceSize, 1);
+// Allocate an empty JSArray. The allocated array is put into the result
+// register. If the parameter initial_capacity is larger than zero an elements
+// backing store is allocated with this size and filled with the hole values.
+// Otherwise the elements backing store is set to the empty FixedArray.
+static void AllocateEmptyJSArray(MacroAssembler* masm,
+                                 Register array_function,
+                                 Register result,
+                                 Register scratch1,
+                                 Register scratch2,
+                                 Register scratch3,
+                                 int initial_capacity,
+                                 Label* gc_required) {
+  ASSERT(initial_capacity >= 0);
 
-      __ pop(rdi);
-      __ pop(rax);
+  // Load the initial map from the array function.
+  __ movq(scratch1, FieldOperand(array_function,
+                                 JSFunction::kPrototypeOrInitialMapOffset));
 
-      __ bind(&allocate);
-    }
+  // Allocate the JSArray object together with space for a fixed array with the
+  // requested elements.
+  int size = JSArray::kSize;
+  if (initial_capacity > 0) {
+    size += FixedArray::SizeFor(initial_capacity);
+  }
+  __ AllocateInNewSpace(size,
+                        result,
+                        scratch2,
+                        scratch3,
+                        gc_required,
+                        TAG_OBJECT);
 
-    // Now allocate the JSObject on the heap.
-    __ movzxbq(rdi, FieldOperand(rax, Map::kInstanceSizeOffset));
-    __ shl(rdi, Immediate(kPointerSizeLog2));
-    // rdi: size of new object
-    __ AllocateInNewSpace(rdi,
-                          rbx,
-                          rdi,
-                          no_reg,
-                          &rt_call,
-                          NO_ALLOCATION_FLAGS);
-    // Allocated the JSObject, now initialize the fields.
-    // rax: initial map
-    // rbx: JSObject (not HeapObject tagged - the actual address).
-    // rdi: start of next object
-    __ movq(Operand(rbx, JSObject::kMapOffset), rax);
-    __ LoadRoot(rcx, Heap::kEmptyFixedArrayRootIndex);
-    __ movq(Operand(rbx, JSObject::kPropertiesOffset), rcx);
-    __ movq(Operand(rbx, JSObject::kElementsOffset), rcx);
-    // Set extra fields in the newly allocated object.
-    // rax: initial map
-    // rbx: JSObject
-    // rdi: start of next object
-    { Label loop, entry;
-      // To allow for truncation.
-      if (count_constructions) {
-        __ LoadRoot(rdx, Heap::kOnePointerFillerMapRootIndex);
-      } else {
-        __ LoadRoot(rdx, Heap::kUndefinedValueRootIndex);
-      }
-      __ lea(rcx, Operand(rbx, JSObject::kHeaderSize));
-      __ jmp(&entry);
-      __ bind(&loop);
-      __ movq(Operand(rcx, 0), rdx);
-      __ addq(rcx, Immediate(kPointerSize));
-      __ bind(&entry);
-      __ cmpq(rcx, rdi);
-      __ j(less, &loop);
-    }
+  // Allocated the JSArray. Now initialize the fields except for the elements
+  // array.
+  // result: JSObject
+  // scratch1: initial map
+  // scratch2: start of next object
+  __ movq(FieldOperand(result, JSObject::kMapOffset), scratch1);
+  __ Move(FieldOperand(result, JSArray::kPropertiesOffset),
+          Factory::empty_fixed_array());
+  // Field JSArray::kElementsOffset is initialized later.
+  __ Move(FieldOperand(result, JSArray::kLengthOffset), Smi::FromInt(0));
 
-    // Add the object tag to make the JSObject real, so that we can continue and
-    // jump into the continuation code at any time from now on. Any failures
-    // need to undo the allocation, so that the heap is in a consistent state
-    // and verifiable.
-    // rax: initial map
-    // rbx: JSObject
-    // rdi: start of next object
-    __ or_(rbx, Immediate(kHeapObjectTag));
+  // If no storage is requested for the elements array just set the empty
+  // fixed array.
+  if (initial_capacity == 0) {
+    __ Move(FieldOperand(result, JSArray::kElementsOffset),
+            Factory::empty_fixed_array());
+    return;
+  }
 
-    // Check if a non-empty properties array is needed.
-    // Allocate and initialize a FixedArray if it is.
-    // rax: initial map
-    // rbx: JSObject
-    // rdi: start of next object
-    // Calculate total properties described map.
-    __ movzxbq(rdx, FieldOperand(rax, Map::kUnusedPropertyFieldsOffset));
-    __ movzxbq(rcx, FieldOperand(rax, Map::kPreAllocatedPropertyFieldsOffset));
-    __ addq(rdx, rcx);
-    // Calculate unused properties past the end of the in-object properties.
-    __ movzxbq(rcx, FieldOperand(rax, Map::kInObjectPropertiesOffset));
-    __ subq(rdx, rcx);
-    // Done if no extra properties are to be allocated.
-    __ j(zero, &allocated);
-    __ Assert(positive, "Property allocation count failed.");
+  // Calculate the location of the elements array and set elements array member
+  // of the JSArray.
+  // result: JSObject
+  // scratch2: start of next object
+  __ lea(scratch1, Operand(result, JSArray::kSize));
+  __ movq(FieldOperand(result, JSArray::kElementsOffset), scratch1);
 
-    // Scale the number of elements by pointer size and add the header for
-    // FixedArrays to the start of the next object calculation from above.
-    // rbx: JSObject
-    // rdi: start of next object (will be start of FixedArray)
-    // rdx: number of elements in properties array
-    __ AllocateInNewSpace(FixedArray::kHeaderSize,
-                          times_pointer_size,
-                          rdx,
-                          rdi,
-                          rax,
-                          no_reg,
-                          &undo_allocation,
-                          RESULT_CONTAINS_TOP);
+  // Initialize the FixedArray and fill it with holes. FixedArray length is
+  // stored as a smi.
+  // result: JSObject
+  // scratch1: elements array
+  // scratch2: start of next object
+  __ Move(FieldOperand(scratch1, HeapObject::kMapOffset),
+          Factory::fixed_array_map());
+  __ Move(FieldOperand(scratch1, FixedArray::kLengthOffset),
+          Smi::FromInt(initial_capacity));
 
-    // Initialize the FixedArray.
-    // rbx: JSObject
-    // rdi: FixedArray
-    // rdx: number of elements
-    // rax: start of next object
-    __ LoadRoot(rcx, Heap::kFixedArrayMapRootIndex);
-    __ movq(Operand(rdi, HeapObject::kMapOffset), rcx);  // setup the map
-    __ Integer32ToSmi(rdx, rdx);
-    __ movq(Operand(rdi, FixedArray::kLengthOffset), rdx);  // and length
-
-    // Initialize the fields to undefined.
-    // rbx: JSObject
-    // rdi: FixedArray
-    // rax: start of next object
-    // rdx: number of elements
-    { Label loop, entry;
-      __ LoadRoot(rdx, Heap::kUndefinedValueRootIndex);
-      __ lea(rcx, Operand(rdi, FixedArray::kHeaderSize));
-      __ jmp(&entry);
-      __ bind(&loop);
-      __ movq(Operand(rcx, 0), rdx);
-      __ addq(rcx, Immediate(kPointerSize));
-      __ bind(&entry);
-      __ cmpq(rcx, rax);
-      __ j(below, &loop);
+  // Fill the FixedArray with the hole value. Inline the code if short.
+  // Reconsider loop unfolding if kPreallocatedArrayElements gets changed.
+  static const int kLoopUnfoldLimit = 4;
+  ASSERT(kPreallocatedArrayElements <= kLoopUnfoldLimit);
+  __ Move(scratch3, Factory::the_hole_value());
+  if (initial_capacity <= kLoopUnfoldLimit) {
+    // Use a scratch register here to have only one reloc info when unfolding
+    // the loop.
+    for (int i = 0; i < initial_capacity; i++) {
+      __ movq(FieldOperand(scratch1,
+                           FixedArray::kHeaderSize + i * kPointerSize),
+              scratch3);
     }
-
-    // Store the initialized FixedArray into the properties field of
-    // the JSObject
-    // rbx: JSObject
-    // rdi: FixedArray
-    __ or_(rdi, Immediate(kHeapObjectTag));  // add the heap tag
-    __ movq(FieldOperand(rbx, JSObject::kPropertiesOffset), rdi);
-
-
-    // Continue with JSObject being successfully allocated
-    // rbx: JSObject
-    __ jmp(&allocated);
-
-    // Undo the setting of the new top so that the heap is verifiable. For
-    // example, the map's unused properties potentially do not match the
-    // allocated objects unused properties.
-    // rbx: JSObject (previous new top)
-    __ bind(&undo_allocation);
-    __ UndoAllocationInNewSpace(rbx);
-  }
-
-  // Allocate the new receiver object using the runtime call.
-  // rdi: function (constructor)
-  __ bind(&rt_call);
-  // Must restore rdi (constructor) before calling runtime.
-  __ movq(rdi, Operand(rsp, 0));
-  __ push(rdi);
-  __ CallRuntime(Runtime::kNewObject, 1);
-  __ movq(rbx, rax);  // store result in rbx
-
-  // New object allocated.
-  // rbx: newly allocated object
-  __ bind(&allocated);
-  // Retrieve the function from the stack.
-  __ pop(rdi);
-
-  // Retrieve smi-tagged arguments count from the stack.
-  __ movq(rax, Operand(rsp, 0));
-  __ SmiToInteger32(rax, rax);
-
-  // Push the allocated receiver to the stack. We need two copies
-  // because we may have to return the original one and the calling
-  // conventions dictate that the called function pops the receiver.
-  __ push(rbx);
-  __ push(rbx);
-
-  // Setup pointer to last argument.
-  __ lea(rbx, Operand(rbp, StandardFrameConstants::kCallerSPOffset));
-
-  // Copy arguments and receiver to the expression stack.
-  Label loop, entry;
-  __ movq(rcx, rax);
-  __ jmp(&entry);
-  __ bind(&loop);
-  __ push(Operand(rbx, rcx, times_pointer_size, 0));
-  __ bind(&entry);
-  __ decq(rcx);
-  __ j(greater_equal, &loop);
-
-  // Call the function.
-  if (is_api_function) {
-    __ movq(rsi, FieldOperand(rdi, JSFunction::kContextOffset));
-    Handle<Code> code = Handle<Code>(
-        Builtins::builtin(Builtins::HandleApiCallConstruct));
-    ParameterCount expected(0);
-    __ InvokeCode(code, expected, expected,
-                  RelocInfo::CODE_TARGET, CALL_FUNCTION);
   } else {
-    ParameterCount actual(rax);
-    __ InvokeFunction(rdi, actual, CALL_FUNCTION);
+    Label loop, entry;
+    __ jmp(&entry);
+    __ bind(&loop);
+    __ movq(Operand(scratch1, 0), scratch3);
+    __ addq(scratch1, Immediate(kPointerSize));
+    __ bind(&entry);
+    __ cmpq(scratch1, scratch2);
+    __ j(below, &loop);
   }
+}
 
-  // Restore context from the frame.
-  __ movq(rsi, Operand(rbp, StandardFrameConstants::kContextOffset));
-
-  // If the result is an object (in the ECMA sense), we should get rid
-  // of the receiver and use the result; see ECMA-262 section 13.2.2-7
-  // on page 74.
-  Label use_receiver, exit;
-  // If the result is a smi, it is *not* an object in the ECMA sense.
-  __ JumpIfSmi(rax, &use_receiver);
-
-  // If the type of the result (stored in its map) is less than
-  // FIRST_JS_OBJECT_TYPE, it is not an object in the ECMA sense.
-  __ CmpObjectType(rax, FIRST_JS_OBJECT_TYPE, rcx);
-  __ j(above_equal, &exit);
 
-  // Throw away the result of the constructor invocation and use the
-  // on-stack receiver as the result.
-  __ bind(&use_receiver);
-  __ movq(rax, Operand(rsp, 0));
+// Allocate a JSArray with the number of elements stored in a register. The
+// register array_function holds the built-in Array function and the register
+// array_size holds the size of the array as a smi. The allocated array is put
+// into the result register and beginning and end of the FixedArray elements
+// storage is put into registers elements_array and elements_array_end  (see
+// below for when that is not the case). If the parameter fill_with_holes is
+// true the allocated elements backing store is filled with the hole values
+// otherwise it is left uninitialized. When the backing store is filled the
+// register elements_array is scratched.
+static void AllocateJSArray(MacroAssembler* masm,
+                            Register array_function,  // Array function.
+                            Register array_size,  // As a smi.
+                            Register result,
+                            Register elements_array,
+                            Register elements_array_end,
+                            Register scratch,
+                            bool fill_with_hole,
+                            Label* gc_required) {
+  Label not_empty, allocated;
 
-  // Restore the arguments count and leave the construct frame.
-  __ bind(&exit);
-  __ movq(rbx, Operand(rsp, kPointerSize));  // get arguments count
-  __ LeaveConstructFrame();
+  // Load the initial map from the array function.
+  __ movq(elements_array,
+          FieldOperand(array_function,
+                       JSFunction::kPrototypeOrInitialMapOffset));
 
-  // Remove caller arguments from the stack and return.
-  __ pop(rcx);
-  SmiIndex index = masm->SmiToIndex(rbx, rbx, kPointerSizeLog2);
-  __ lea(rsp, Operand(rsp, index.reg, index.scale, 1 * kPointerSize));
-  __ push(rcx);
-  __ IncrementCounter(&Counters::constructed_objects, 1);
-  __ ret(0);
-}
+  // Check whether an empty sized array is requested.
+  __ testq(array_size, array_size);
+  __ j(not_zero, &not_empty);
 
+  // If an empty array is requested allocate a small elements array anyway. This
+  // keeps the code below free of special casing for the empty array.
+  int size = JSArray::kSize + FixedArray::SizeFor(kPreallocatedArrayElements);
+  __ AllocateInNewSpace(size,
+                        result,
+                        elements_array_end,
+                        scratch,
+                        gc_required,
+                        TAG_OBJECT);
+  __ jmp(&allocated);
 
-void Builtins::Generate_JSConstructStubCountdown(MacroAssembler* masm) {
-  Generate_JSConstructStubHelper(masm, false, true);
-}
+  // Allocate the JSArray object together with space for a FixedArray with the
+  // requested elements.
+  __ bind(&not_empty);
+  SmiIndex index =
+      masm->SmiToIndex(kScratchRegister, array_size, kPointerSizeLog2);
+  __ AllocateInNewSpace(JSArray::kSize + FixedArray::kHeaderSize,
+                        index.scale,
+                        index.reg,
+                        result,
+                        elements_array_end,
+                        scratch,
+                        gc_required,
+                        TAG_OBJECT);
 
+  // Allocated the JSArray. Now initialize the fields except for the elements
+  // array.
+  // result: JSObject
+  // elements_array: initial map
+  // elements_array_end: start of next object
+  // array_size: size of array (smi)
+  __ bind(&allocated);
+  __ movq(FieldOperand(result, JSObject::kMapOffset), elements_array);
+  __ Move(elements_array, Factory::empty_fixed_array());
+  __ movq(FieldOperand(result, JSArray::kPropertiesOffset), elements_array);
+  // Field JSArray::kElementsOffset is initialized later.
+  __ movq(FieldOperand(result, JSArray::kLengthOffset), array_size);
 
-void Builtins::Generate_JSConstructStubGeneric(MacroAssembler* masm) {
-  Generate_JSConstructStubHelper(masm, false, false);
-}
+  // Calculate the location of the elements array and set elements array member
+  // of the JSArray.
+  // result: JSObject
+  // elements_array_end: start of next object
+  // array_size: size of array (smi)
+  __ lea(elements_array, Operand(result, JSArray::kSize));
+  __ movq(FieldOperand(result, JSArray::kElementsOffset), elements_array);
 
+  // Initialize the fixed array. FixedArray length is stored as a smi.
+  // result: JSObject
+  // elements_array: elements array
+  // elements_array_end: start of next object
+  // array_size: size of array (smi)
+  __ Move(FieldOperand(elements_array, JSObject::kMapOffset),
+          Factory::fixed_array_map());
+  Label not_empty_2, fill_array;
+  __ SmiTest(array_size);
+  __ j(not_zero, &not_empty_2);
+  // Length of the FixedArray is the number of pre-allocated elements even
+  // though the actual JSArray has length 0.
+  __ Move(FieldOperand(elements_array, FixedArray::kLengthOffset),
+          Smi::FromInt(kPreallocatedArrayElements));
+  __ jmp(&fill_array);
+  __ bind(&not_empty_2);
+  // For non-empty JSArrays the length of the FixedArray and the JSArray is the
+  // same.
+  __ movq(FieldOperand(elements_array, FixedArray::kLengthOffset), array_size);
 
-void Builtins::Generate_JSConstructStubApi(MacroAssembler* masm) {
-  Generate_JSConstructStubHelper(masm, true, false);
+  // Fill the allocated FixedArray with the hole value if requested.
+  // result: JSObject
+  // elements_array: elements array
+  // elements_array_end: start of next object
+  __ bind(&fill_array);
+  if (fill_with_hole) {
+    Label loop, entry;
+    __ Move(scratch, Factory::the_hole_value());
+    __ lea(elements_array, Operand(elements_array,
+                                   FixedArray::kHeaderSize - kHeapObjectTag));
+    __ jmp(&entry);
+    __ bind(&loop);
+    __ movq(Operand(elements_array, 0), scratch);
+    __ addq(elements_array, Immediate(kPointerSize));
+    __ bind(&entry);
+    __ cmpq(elements_array, elements_array_end);
+    __ j(below, &loop);
+  }
 }
 
 
-static void Generate_JSEntryTrampolineHelper(MacroAssembler* masm,
-                                             bool is_construct) {
-  // Expects five C++ function parameters.
-  // - Address entry (ignored)
-  // - JSFunction* function (
-  // - Object* receiver
-  // - int argc
-  // - Object*** argv
-  // (see Handle::Invoke in execution.cc).
-
-  // Platform specific argument handling. After this, the stack contains
-  // an internal frame and the pushed function and receiver, and
-  // register rax and rbx holds the argument count and argument array,
-  // while rdi holds the function pointer and rsi the context.
-#ifdef _WIN64
-  // MSVC parameters in:
-  // rcx : entry (ignored)
-  // rdx : function
-  // r8 : receiver
-  // r9 : argc
-  // [rsp+0x20] : argv
-
-  // Clear the context before we push it when entering the JS frame.
-  __ xor_(rsi, rsi);
-  __ EnterInternalFrame();
-
-  // Load the function context into rsi.
-  __ movq(rsi, FieldOperand(rdx, JSFunction::kContextOffset));
+// Create a new array for the built-in Array function. This function allocates
+// the JSArray object and the FixedArray elements array and initializes these.
+// If the Array cannot be constructed in native code the runtime is called. This
+// function assumes the following state:
+//   rdi: constructor (built-in Array function)
+//   rax: argc
+//   rsp[0]: return address
+//   rsp[8]: last argument
+// This function is used for both construct and normal calls of Array. The only
+// difference between handling a construct call and a normal call is that for a
+// construct call the constructor function in rdi needs to be preserved for
+// entering the generic code. In both cases argc in rax needs to be preserved.
+// Both registers are preserved by this code so no need to differentiate between
+// a construct call and a normal call.
+static void ArrayNativeCode(MacroAssembler* masm,
+                            Label *call_generic_code) {
+  Label argc_one_or_more, argc_two_or_more;
 
-  // Push the function and the receiver onto the stack.
-  __ push(rdx);
-  __ push(r8);
+  // Check for array construction with zero arguments.
+  __ testq(rax, rax);
+  __ j(not_zero, &argc_one_or_more);
 
-  // Load the number of arguments and setup pointer to the arguments.
-  __ movq(rax, r9);
-  // Load the previous frame pointer to access C argument on stack
-  __ movq(kScratchRegister, Operand(rbp, 0));
-  __ movq(rbx, Operand(kScratchRegister, EntryFrameConstants::kArgvOffset));
-  // Load the function pointer into rdi.
-  __ movq(rdi, rdx);
-#else  // _WIN64
-  // GCC parameters in:
-  // rdi : entry (ignored)
-  // rsi : function
-  // rdx : receiver
-  // rcx : argc
-  // r8  : argv
+  // Handle construction of an empty array.
+  AllocateEmptyJSArray(masm,
+                       rdi,
+                       rbx,
+                       rcx,
+                       rdx,
+                       r8,
+                       kPreallocatedArrayElements,
+                       call_generic_code);
+  __ IncrementCounter(&Counters::array_function_native, 1);
+  __ movq(rax, rbx);
+  __ ret(kPointerSize);
 
-  __ movq(rdi, rsi);
-  // rdi : function
+  // Check for one argument. Bail out if argument is not smi or if it is
+  // negative.
+  __ bind(&argc_one_or_more);
+  __ cmpq(rax, Immediate(1));
+  __ j(not_equal, &argc_two_or_more);
+  __ movq(rdx, Operand(rsp, kPointerSize));  // Get the argument from the stack.
+  __ JumpUnlessNonNegativeSmi(rdx, call_generic_code);
 
-  // Clear the context before we push it when entering the JS frame.
-  __ xor_(rsi, rsi);
-  // Enter an internal frame.
-  __ EnterInternalFrame();
+  // Handle construction of an empty array of a certain size. Bail out if size
+  // is to large to actually allocate an elements array.
+  __ SmiCompare(rdx, Smi::FromInt(JSObject::kInitialMaxFastElementArray));
+  __ j(greater_equal, call_generic_code);
 
-  // Push the function and receiver and setup the context.
-  __ push(rdi);
-  __ push(rdx);
-  __ movq(rsi, FieldOperand(rdi, JSFunction::kContextOffset));
+  // rax: argc
+  // rdx: array_size (smi)
+  // rdi: constructor
+  // esp[0]: return address
+  // esp[8]: argument
+  AllocateJSArray(masm,
+                  rdi,
+                  rdx,
+                  rbx,
+                  rcx,
+                  r8,
+                  r9,
+                  true,
+                  call_generic_code);
+  __ IncrementCounter(&Counters::array_function_native, 1);
+  __ movq(rax, rbx);
+  __ ret(2 * kPointerSize);
 
-  // Load the number of arguments and setup pointer to the arguments.
-  __ movq(rax, rcx);
-  __ movq(rbx, r8);
-#endif  // _WIN64
+  // Handle construction of an array from a list of arguments.
+  __ bind(&argc_two_or_more);
+  __ movq(rdx, rax);
+  __ Integer32ToSmi(rdx, rdx);  // Convet argc to a smi.
+  // rax: argc
+  // rdx: array_size (smi)
+  // rdi: constructor
+  // esp[0] : return address
+  // esp[8] : last argument
+  AllocateJSArray(masm,
+                  rdi,
+                  rdx,
+                  rbx,
+                  rcx,
+                  r8,
+                  r9,
+                  false,
+                  call_generic_code);
+  __ IncrementCounter(&Counters::array_function_native, 1);
 
-  // Current stack contents:
-  // [rsp + 2 * kPointerSize ... ]: Internal frame
-  // [rsp + kPointerSize]         : function
-  // [rsp]                        : receiver
-  // Current register contents:
-  // rax : argc
-  // rbx : argv
-  // rsi : context
-  // rdi : function
+  // rax: argc
+  // rbx: JSArray
+  // rcx: elements_array
+  // r8: elements_array_end (untagged)
+  // esp[0]: return address
+  // esp[8]: last argument
 
-  // Copy arguments to the stack in a loop.
-  // Register rbx points to array of pointers to handle locations.
-  // Push the values of these handles.
+  // Location of the last argument
+  __ lea(r9, Operand(rsp, kPointerSize));
+
+  // Location of the first array element (Parameter fill_with_holes to
+  // AllocateJSArrayis false, so the FixedArray is returned in rcx).
+  __ lea(rdx, Operand(rcx, FixedArray::kHeaderSize - kHeapObjectTag));
+
+  // rax: argc
+  // rbx: JSArray
+  // rdx: location of the first array element
+  // r9: location of the last argument
+  // esp[0]: return address
+  // esp[8]: last argument
   Label loop, entry;
-  __ xor_(rcx, rcx);  // Set loop variable to 0.
+  __ movq(rcx, rax);
   __ jmp(&entry);
   __ bind(&loop);
-  __ movq(kScratchRegister, Operand(rbx, rcx, times_pointer_size, 0));
-  __ push(Operand(kScratchRegister, 0));  // dereference handle
-  __ addq(rcx, Immediate(1));
+  __ movq(kScratchRegister, Operand(r9, rcx, times_pointer_size, 0));
+  __ movq(Operand(rdx, 0), kScratchRegister);
+  __ addq(rdx, Immediate(kPointerSize));
   __ bind(&entry);
-  __ cmpq(rcx, rax);
-  __ j(not_equal, &loop);
+  __ decq(rcx);
+  __ j(greater_equal, &loop);
 
-  // Invoke the code.
-  if (is_construct) {
-    // Expects rdi to hold function pointer.
-    __ Call(Handle<Code>(Builtins::builtin(Builtins::JSConstructCall)),
-            RelocInfo::CODE_TARGET);
-  } else {
-    ParameterCount actual(rax);
-    // Function must be in rdi.
-    __ InvokeFunction(rdi, actual, CALL_FUNCTION);
+  // Remove caller arguments from the stack and return.
+  // rax: argc
+  // rbx: JSArray
+  // esp[0]: return address
+  // esp[8]: last argument
+  __ pop(rcx);
+  __ lea(rsp, Operand(rsp, rax, times_pointer_size, 1 * kPointerSize));
+  __ push(rcx);
+  __ movq(rax, rbx);
+  __ ret(0);
+}
+
+
+void Builtins::Generate_ArrayCode(MacroAssembler* masm) {
+  // ----------- S t a t e -------------
+  //  -- rax : argc
+  //  -- rsp[0] : return address
+  //  -- rsp[8] : last argument
+  // -----------------------------------
+  Label generic_array_code;
+
+  // Get the Array function.
+  __ LoadGlobalFunction(Context::ARRAY_FUNCTION_INDEX, rdi);
+
+  if (FLAG_debug_code) {
+    // Initial map for the builtin Array function shoud be a map.
+    __ movq(rbx, FieldOperand(rdi, JSFunction::kPrototypeOrInitialMapOffset));
+    // Will both indicate a NULL and a Smi.
+    ASSERT(kSmiTag == 0);
+    Condition not_smi = NegateCondition(masm->CheckSmi(rbx));
+    __ Check(not_smi, "Unexpected initial map for Array function");
+    __ CmpObjectType(rbx, MAP_TYPE, rcx);
+    __ Check(equal, "Unexpected initial map for Array function");
   }
 
-  // Exit the JS frame. Notice that this also removes the empty
-  // context and the function left on the stack by the code
-  // invocation.
-  __ LeaveInternalFrame();
-  // TODO(X64): Is argument correct? Is there a receiver to remove?
-  __ ret(1 * kPointerSize);  // remove receiver
+  // Run the native code for the Array function called as a normal function.
+  ArrayNativeCode(masm, &generic_array_code);
+
+  // Jump to the generic array code in case the specialized code cannot handle
+  // the construction.
+  __ bind(&generic_array_code);
+  Code* code = Builtins::builtin(Builtins::ArrayCodeGeneric);
+  Handle<Code> array_code(code);
+  __ Jump(array_code, RelocInfo::CODE_TARGET);
 }
 
 
-void Builtins::Generate_JSEntryTrampoline(MacroAssembler* masm) {
-  Generate_JSEntryTrampolineHelper(masm, false);
+void Builtins::Generate_ArrayConstructCode(MacroAssembler* masm) {
+  // ----------- S t a t e -------------
+  //  -- rax : argc
+  //  -- rdi : constructor
+  //  -- rsp[0] : return address
+  //  -- rsp[8] : last argument
+  // -----------------------------------
+  Label generic_constructor;
+
+  if (FLAG_debug_code) {
+    // The array construct code is only set for the builtin Array function which
+    // does always have a map.
+    __ LoadGlobalFunction(Context::ARRAY_FUNCTION_INDEX, rbx);
+    __ cmpq(rdi, rbx);
+    __ Check(equal, "Unexpected Array function");
+    // Initial map for the builtin Array function should be a map.
+    __ movq(rbx, FieldOperand(rdi, JSFunction::kPrototypeOrInitialMapOffset));
+    // Will both indicate a NULL and a Smi.
+    ASSERT(kSmiTag == 0);
+    Condition not_smi = NegateCondition(masm->CheckSmi(rbx));
+    __ Check(not_smi, "Unexpected initial map for Array function");
+    __ CmpObjectType(rbx, MAP_TYPE, rcx);
+    __ Check(equal, "Unexpected initial map for Array function");
+  }
+
+  // Run the native code for the Array function called as constructor.
+  ArrayNativeCode(masm, &generic_constructor);
+
+  // Jump to the generic construct code in case the specialized code cannot
+  // handle the construction.
+  __ bind(&generic_constructor);
+  Code* code = Builtins::builtin(Builtins::JSConstructStubGeneric);
+  Handle<Code> generic_construct_stub(code);
+  __ Jump(generic_construct_stub, RelocInfo::CODE_TARGET);
 }
 
 
-void Builtins::Generate_JSConstructEntryTrampoline(MacroAssembler* masm) {
-  Generate_JSEntryTrampolineHelper(masm, true);
+void Builtins::Generate_StringConstructCode(MacroAssembler* masm) {
+  // TODO(849): implement custom construct stub.
+  // Generate a copy of the generic stub for now.
+  Generate_JSConstructStubGeneric(masm);
 }
 
 
-void Builtins::Generate_LazyCompile(MacroAssembler* masm) {
-  // Enter an internal frame.
-  __ EnterInternalFrame();
+static void EnterArgumentsAdaptorFrame(MacroAssembler* masm) {
+  __ push(rbp);
+  __ movq(rbp, rsp);
 
-  // Push a copy of the function onto the stack.
+  // Store the arguments adaptor context sentinel.
+  __ Push(Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR));
+
+  // Push the function on the stack.
   __ push(rdi);
 
-  __ push(rdi);  // Function is also the parameter to the runtime call.
-  __ CallRuntime(Runtime::kLazyCompile, 1);
-  __ pop(rdi);
+  // Preserve the number of arguments on the stack. Must preserve both
+  // rax and rbx because these registers are used when copying the
+  // arguments and the receiver.
+  __ Integer32ToSmi(rcx, rax);
+  __ push(rcx);
+}
 
-  // Tear down temporary frame.
-  __ LeaveInternalFrame();
 
-  // Do a tail-call of the compiled function.
-  __ lea(rcx, FieldOperand(rax, Code::kHeaderSize));
-  __ jmp(rcx);
+static void LeaveArgumentsAdaptorFrame(MacroAssembler* masm) {
+  // Retrieve the number of arguments from the stack. Number is a Smi.
+  __ movq(rbx, Operand(rbp, ArgumentsAdaptorFrameConstants::kLengthOffset));
+
+  // Leave the frame.
+  __ movq(rsp, rbp);
+  __ pop(rbp);
+
+  // Remove caller arguments from the stack.
+  __ pop(rcx);
+  SmiIndex index = masm->SmiToIndex(rbx, rbx, kPointerSizeLog2);
+  __ lea(rsp, Operand(rsp, index.reg, index.scale, 1 * kPointerSize));
+  __ push(rcx);
 }
 
 
-void Builtins::Generate_LazyRecompile(MacroAssembler* masm) {
-  // Enter an internal frame.
-  __ EnterInternalFrame();
+void Builtins::Generate_ArgumentsAdaptorTrampoline(MacroAssembler* masm) {
+  // ----------- S t a t e -------------
+  //  -- rax : actual number of arguments
+  //  -- rbx : expected number of arguments
+  //  -- rdx : code entry to call
+  // -----------------------------------
 
-  // Push a copy of the function onto the stack.
-  __ push(rdi);
+  Label invoke, dont_adapt_arguments;
+  __ IncrementCounter(&Counters::arguments_adaptors, 1);
 
-  __ push(rdi);  // Function is also the parameter to the runtime call.
-  __ CallRuntime(Runtime::kLazyRecompile, 1);
+  Label enough, too_few;
+  __ cmpq(rax, rbx);
+  __ j(less, &too_few);
+  __ cmpq(rbx, Immediate(SharedFunctionInfo::kDontAdaptArgumentsSentinel));
+  __ j(equal, &dont_adapt_arguments);
 
-  // Restore function and tear down temporary frame.
-  __ pop(rdi);
-  __ LeaveInternalFrame();
+  {  // Enough parameters: Actual >= expected.
+    __ bind(&enough);
+    EnterArgumentsAdaptorFrame(masm);
 
-  // Do a tail-call of the compiled function.
-  __ lea(rcx, FieldOperand(rax, Code::kHeaderSize));
-  __ jmp(rcx);
-}
+    // Copy receiver and all expected arguments.
+    const int offset = StandardFrameConstants::kCallerSPOffset;
+    __ lea(rax, Operand(rbp, rax, times_pointer_size, offset));
+    __ movq(rcx, Immediate(-1));  // account for receiver
 
+    Label copy;
+    __ bind(&copy);
+    __ incq(rcx);
+    __ push(Operand(rax, 0));
+    __ subq(rax, Immediate(kPointerSize));
+    __ cmpq(rcx, rbx);
+    __ j(less, &copy);
+    __ jmp(&invoke);
+  }
 
-void Builtins::Generate_NotifyDeoptimized(MacroAssembler* masm) {
-  __ int3();
-}
+  {  // Too few parameters: Actual < expected.
+    __ bind(&too_few);
+    EnterArgumentsAdaptorFrame(masm);
 
+    // Copy receiver and all actual arguments.
+    const int offset = StandardFrameConstants::kCallerSPOffset;
+    __ lea(rdi, Operand(rbp, rax, times_pointer_size, offset));
+    __ movq(rcx, Immediate(-1));  // account for receiver
 
-void Builtins::Generate_NotifyLazyDeoptimized(MacroAssembler* masm) {
-  __ int3();
-}
+    Label copy;
+    __ bind(&copy);
+    __ incq(rcx);
+    __ push(Operand(rdi, 0));
+    __ subq(rdi, Immediate(kPointerSize));
+    __ cmpq(rcx, rax);
+    __ j(less, &copy);
 
+    // Fill remaining expected arguments with undefined values.
+    Label fill;
+    __ LoadRoot(kScratchRegister, Heap::kUndefinedValueRootIndex);
+    __ bind(&fill);
+    __ incq(rcx);
+    __ push(kScratchRegister);
+    __ cmpq(rcx, rbx);
+    __ j(less, &fill);
 
-void Builtins::Generate_NotifyOSR(MacroAssembler* masm) {
-  __ int3();
+    // Restore function pointer.
+    __ movq(rdi, Operand(rbp, JavaScriptFrameConstants::kFunctionOffset));
+  }
+
+  // Call the entry point.
+  __ bind(&invoke);
+  __ call(rdx);
+
+  // Leave frame and return.
+  LeaveArgumentsAdaptorFrame(masm);
+  __ ret(0);
+
+  // -------------------------------------------
+  // Dont adapt arguments.
+  // -------------------------------------------
+  __ bind(&dont_adapt_arguments);
+  __ jmp(rdx);
 }
 
 
@@ -1388,6 +1384,8 @@ void Builtins::Generate_OnStackReplacement(MacroAssembler* masm) {
 }
 
 
+#undef __
+
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64
diff --git a/deps/v8/src/x64/full-codegen-x64.cc b/deps/v8/src/x64/full-codegen-x64.cc
index 574688c14d..355cf91662 100644
--- a/deps/v8/src/x64/full-codegen-x64.cc
+++ b/deps/v8/src/x64/full-codegen-x64.cc
@@ -839,7 +839,9 @@ void FullCodeGenerator::VisitForInStatement(ForInStatement* stmt) {
   __ bind(&update_each);
   __ movq(result_register(), rbx);
   // Perform the assignment as if via '='.
-  EmitAssignment(stmt->each());
+  { EffectContext context(this);
+    EmitAssignment(stmt->each(), stmt->AssignmentId());
+  }
 
   // Generate code for the body of the loop.
   Visit(stmt->body());
@@ -1521,7 +1523,7 @@ void FullCodeGenerator::EmitBinaryOp(Token::Value op,
 }
 
 
-void FullCodeGenerator::EmitAssignment(Expression* expr) {
+void FullCodeGenerator::EmitAssignment(Expression* expr, int bailout_id) {
   // Invalid left-hand sides are rewritten to have a 'throw
   // ReferenceError' on the left-hand side.
   if (!expr->IsValidLeftHandSide()) {
@@ -1569,6 +1571,7 @@ void FullCodeGenerator::EmitAssignment(Expression* expr) {
       break;
     }
   }
+  context()->Plug(rax);
 }
 
 
@@ -1641,8 +1644,6 @@ void FullCodeGenerator::EmitVariableAssignment(Variable* var,
     }
     __ bind(&done);
   }
-
-  context()->Plug(rax);
 }
 
 
@@ -1679,10 +1680,9 @@ void FullCodeGenerator::EmitNamedPropertyAssignment(Assignment* expr) {
     __ push(Operand(rsp, kPointerSize));  // Receiver is under value.
     __ CallRuntime(Runtime::kToFastProperties, 1);
     __ pop(rax);
-    context()->DropAndPlug(1, rax);
-  } else {
-    context()->Plug(rax);
+    __ Drop(1);
   }
+  context()->Plug(rax);
 }
 
 
@@ -3127,6 +3127,7 @@ void FullCodeGenerator::VisitCountOperation(CountOperation* expr) {
         { EffectContext context(this);
           EmitVariableAssignment(expr->expression()->AsVariableProxy()->var(),
                                  Token::ASSIGN);
+          context.Plug(rax);
         }
         // For all contexts except kEffect: We have the result on
         // top of the stack.
@@ -3137,6 +3138,7 @@ void FullCodeGenerator::VisitCountOperation(CountOperation* expr) {
         // Perform the assignment as if via '='.
         EmitVariableAssignment(expr->expression()->AsVariableProxy()->var(),
                                Token::ASSIGN);
+        context()->Plug(rax);
       }
       break;
     case NAMED_PROPERTY: {
diff --git a/deps/v8/src/x64/lithium-x64.h b/deps/v8/src/x64/lithium-x64.h
index 0c1559be44..f66ec1689c 100644
--- a/deps/v8/src/x64/lithium-x64.h
+++ b/deps/v8/src/x64/lithium-x64.h
@@ -216,11 +216,6 @@ class LChunk: public ZoneObject {
     return 0;
   }
 
-  int NearestNextGapPos(int index) const {
-    UNIMPLEMENTED();
-    return 0;
-  }
-
   void MarkEmptyBlocks() { UNIMPLEMENTED(); }
 
 #ifdef DEBUG
diff --git a/deps/v8/src/x64/macro-assembler-x64.cc b/deps/v8/src/x64/macro-assembler-x64.cc
index 5bb5ffd991..1df9b4750c 100644
--- a/deps/v8/src/x64/macro-assembler-x64.cc
+++ b/deps/v8/src/x64/macro-assembler-x64.cc
@@ -2250,6 +2250,31 @@ void MacroAssembler::LoadContext(Register dst, int context_chain_length) {
 }
 
 
+void MacroAssembler::LoadGlobalFunction(int index, Register function) {
+  // Load the global or builtins object from the current context.
+  movq(function, Operand(rsi, Context::SlotOffset(Context::GLOBAL_INDEX)));
+  // Load the global context from the global or builtins object.
+  movq(function, FieldOperand(function, GlobalObject::kGlobalContextOffset));
+  // Load the function from the global context.
+  movq(function, Operand(function, Context::SlotOffset(index)));
+}
+
+
+void MacroAssembler::LoadGlobalFunctionInitialMap(Register function,
+                                                  Register map) {
+  // Load the initial map.  The global functions all have initial maps.
+  movq(map, FieldOperand(function, JSFunction::kPrototypeOrInitialMapOffset));
+  if (FLAG_debug_code) {
+    Label ok, fail;
+    CheckMap(map, Factory::meta_map(), &fail, false);
+    jmp(&ok);
+    bind(&fail);
+    Abort("Global functions must have initial map");
+    bind(&ok);
+  }
+}
+
+
 int MacroAssembler::ArgumentStackSlotsForCFunctionCall(int num_arguments) {
   // On Windows 64 stack slots are reserved by the caller for all arguments
   // including the ones passed in registers, and space is always allocated for
diff --git a/deps/v8/src/x64/macro-assembler-x64.h b/deps/v8/src/x64/macro-assembler-x64.h
index 348191ee25..d8f2fba42a 100644
--- a/deps/v8/src/x64/macro-assembler-x64.h
+++ b/deps/v8/src/x64/macro-assembler-x64.h
@@ -772,6 +772,13 @@ class MacroAssembler: public Assembler {
   // Find the function context up the context chain.
   void LoadContext(Register dst, int context_chain_length);
 
+  // Load the global function with the given index.
+  void LoadGlobalFunction(int index, Register function);
+
+  // Load the initial map from the global function. The registers
+  // function and map can be the same.
+  void LoadGlobalFunctionInitialMap(Register function, Register map);
+
   // ---------------------------------------------------------------------------
   // Runtime calls
 
diff --git a/deps/v8/test/cctest/cctest.status b/deps/v8/test/cctest/cctest.status
index 4f1bcdc8ad..d7f02b95d8 100644
--- a/deps/v8/test/cctest/cctest.status
+++ b/deps/v8/test/cctest/cctest.status
@@ -42,9 +42,6 @@ test-api/ApplyInterruption: PASS || TIMEOUT
 # when snapshot is on, so I am marking it PASS || FAIL
 test-heap-profiler/HeapSnapshotsDiff: PASS || FAIL
 
-# BUG(3260336): Flaky test. May be timing related.
-test-profile-generator/RecordStackTraceAtStartProfiling: PASS || FAIL
-
 # These tests always fail.  They are here to test test.py.  If
 # they don't fail then test.py has failed.
 test-serialize/TestThatAlwaysFails: FAIL
diff --git a/deps/v8/test/cctest/test-heap-profiler.cc b/deps/v8/test/cctest/test-heap-profiler.cc
index ac4afb2517..ad242fe79c 100644
--- a/deps/v8/test/cctest/test-heap-profiler.cc
+++ b/deps/v8/test/cctest/test-heap-profiler.cc
@@ -1211,4 +1211,51 @@ TEST(HeapSnapshotGetNodeById) {
   CHECK_EQ(NULL, snapshot->GetNodeById(0x1000000UL));
 }
 
+
+namespace {
+
+class TestActivityControl : public v8::ActivityControl {
+ public:
+  explicit TestActivityControl(int abort_count)
+      : done_(0), total_(0), abort_count_(abort_count) {}
+  ControlOption ReportProgressValue(int done, int total) {
+    done_ = done;
+    total_ = total;
+    return --abort_count_ != 0 ? kContinue : kAbort;
+  }
+  int done() { return done_; }
+  int total() { return total_; }
+
+ private:
+  int done_;
+  int total_;
+  int abort_count_;
+};
+}
+
+TEST(TakeHeapSnapshotAborting) {
+  v8::HandleScope scope;
+  LocalContext env;
+
+  const int snapshots_count = v8::HeapProfiler::GetSnapshotsCount();
+  TestActivityControl aborting_control(3);
+  const v8::HeapSnapshot* no_snapshot =
+      v8::HeapProfiler::TakeSnapshot(v8::String::New("abort"),
+                                     v8::HeapSnapshot::kFull,
+                                     &aborting_control);
+  CHECK_EQ(NULL, no_snapshot);
+  CHECK_EQ(snapshots_count, v8::HeapProfiler::GetSnapshotsCount());
+  CHECK_GT(aborting_control.total(), aborting_control.done());
+
+  TestActivityControl control(-1);  // Don't abort.
+  const v8::HeapSnapshot* snapshot =
+      v8::HeapProfiler::TakeSnapshot(v8::String::New("full"),
+                                     v8::HeapSnapshot::kFull,
+                                     &control);
+  CHECK_NE(NULL, snapshot);
+  CHECK_EQ(snapshots_count + 1, v8::HeapProfiler::GetSnapshotsCount());
+  CHECK_EQ(control.total(), control.done());
+  CHECK_GT(control.total(), 0);
+}
+
 #endif  // ENABLE_LOGGING_AND_PROFILING
diff --git a/deps/v8/test/cctest/test-log-utils.cc b/deps/v8/test/cctest/test-log-utils.cc
index c99d770d42..861be12ce8 100644
--- a/deps/v8/test/cctest/test-log-utils.cc
+++ b/deps/v8/test/cctest/test-log-utils.cc
@@ -12,7 +12,6 @@
 using v8::internal::CStrVector;
 using v8::internal::EmbeddedVector;
 using v8::internal::LogDynamicBuffer;
-using v8::internal::LogRecordCompressor;
 using v8::internal::MutableCStrVector;
 using v8::internal::ScopedVector;
 using v8::internal::Vector;
@@ -138,173 +137,4 @@ TEST(DynaBufSealing) {
   CHECK_EQ(0, ReadData(&dynabuf, 100 + seal_size, &buf));
 }
 
-
-TEST(CompressorStore) {
-  LogRecordCompressor comp(2);
-  const Vector<const char> empty = CStrVector("");
-  CHECK(comp.Store(empty));
-  CHECK(!comp.Store(empty));
-  CHECK(!comp.Store(empty));
-  const Vector<const char> aaa = CStrVector("aaa");
-  CHECK(comp.Store(aaa));
-  CHECK(!comp.Store(aaa));
-  CHECK(!comp.Store(aaa));
-  CHECK(comp.Store(empty));
-  CHECK(!comp.Store(empty));
-  CHECK(!comp.Store(empty));
-}
-
-
-void CheckCompression(LogRecordCompressor* comp,
-                      const Vector<const char>& after) {
-  EmbeddedVector<char, 100> result;
-  CHECK(comp->RetrievePreviousCompressed(&result));
-  CHECK_EQ(after, result);
-}
-
-
-void CheckCompression(LogRecordCompressor* comp,
-                      const char* after) {
-  CheckCompression(comp, CStrVector(after));
-}
-
-
-TEST(CompressorNonCompressed) {
-  LogRecordCompressor comp(0);
-  CHECK(!comp.RetrievePreviousCompressed(NULL));
-  const Vector<const char> empty = CStrVector("");
-  CHECK(comp.Store(empty));
-  CHECK(!comp.RetrievePreviousCompressed(NULL));
-  const Vector<const char> a_x_20 = CStrVector("aaaaaaaaaaaaaaaaaaaa");
-  CHECK(comp.Store(a_x_20));
-  CheckCompression(&comp, empty);
-  CheckCompression(&comp, empty);
-  CHECK(comp.Store(empty));
-  CheckCompression(&comp, a_x_20);
-  CheckCompression(&comp, a_x_20);
-}
-
-
-TEST(CompressorSingleLine) {
-  LogRecordCompressor comp(1);
-  const Vector<const char> string_1 = CStrVector("eee,ddd,ccc,bbb,aaa");
-  CHECK(comp.Store(string_1));
-  const Vector<const char> string_2 = CStrVector("fff,ddd,ccc,bbb,aaa");
-  CHECK(comp.Store(string_2));
-  // string_1 hasn't been compressed.
-  CheckCompression(&comp, string_1);
-  CheckCompression(&comp, string_1);
-  const Vector<const char> string_3 = CStrVector("hhh,ggg,ccc,bbb,aaa");
-  CHECK(comp.Store(string_3));
-  // string_2 compressed using string_1.
-  CheckCompression(&comp, "fff#1:3");
-  CheckCompression(&comp, "fff#1:3");
-  CHECK(!comp.Store(string_3));
-  // Expecting no changes.
-  CheckCompression(&comp, "fff#1:3");
-  CHECK(!comp.Store(string_3));
-  // Expecting no changes.
-  CheckCompression(&comp, "fff#1:3");
-  const Vector<const char> string_4 = CStrVector("iii,hhh,ggg,ccc,bbb,aaa");
-  CHECK(comp.Store(string_4));
-  // string_3 compressed using string_2.
-  CheckCompression(&comp, "hhh,ggg#1:7");
-  const Vector<const char> string_5 = CStrVector("nnn,mmm,lll,kkk,jjj");
-  CHECK(comp.Store(string_5));
-  // string_4 compressed using string_3.
-  CheckCompression(&comp, "iii,#1");
-  const Vector<const char> string_6 = CStrVector("nnn,mmmmmm,lll,kkk,jjj");
-  CHECK(comp.Store(string_6));
-  // string_5 hasn't been compressed.
-  CheckCompression(&comp, string_5);
-  CHECK(comp.Store(string_5));
-  // string_6 compressed using string_5.
-  CheckCompression(&comp, "nnn,mmm#1:4");
-  const Vector<const char> string_7 = CStrVector("nnnnnn,mmm,lll,kkk,jjj");
-  CHECK(comp.Store(string_7));
-  // string_5 compressed using string_6.
-  CheckCompression(&comp, "nnn,#1:7");
-  const Vector<const char> string_8 = CStrVector("xxn,mmm,lll,kkk,jjj");
-  CHECK(comp.Store(string_8));
-  // string_7 compressed using string_5.
-  CheckCompression(&comp, "nnn#1");
-  const Vector<const char> string_9 =
-      CStrVector("aaaaaaaaaaaaa,bbbbbbbbbbbbbbbbb");
-  CHECK(comp.Store(string_9));
-  // string_8 compressed using string_7.
-  CheckCompression(&comp, "xx#1:5");
-  const Vector<const char> string_10 =
-      CStrVector("aaaaaaaaaaaaa,cccccccbbbbbbbbbb");
-  CHECK(comp.Store(string_10));
-  // string_9 hasn't been compressed.
-  CheckCompression(&comp, string_9);
-  CHECK(comp.Store(string_1));
-  // string_10 compressed using string_9.
-  CheckCompression(&comp, "aaaaaaaaaaaaa,ccccccc#1:21");
-}
-
-
-
-TEST(CompressorMultiLines) {
-  const int kWindowSize = 3;
-  LogRecordCompressor comp(kWindowSize);
-  const Vector<const char> string_1 = CStrVector("eee,ddd,ccc,bbb,aaa");
-  CHECK(comp.Store(string_1));
-  const Vector<const char> string_2 = CStrVector("iii,hhh,ggg,fff,aaa");
-  CHECK(comp.Store(string_2));
-  const Vector<const char> string_3 = CStrVector("mmm,lll,kkk,jjj,aaa");
-  CHECK(comp.Store(string_3));
-  const Vector<const char> string_4 = CStrVector("nnn,hhh,ggg,fff,aaa");
-  CHECK(comp.Store(string_4));
-  const Vector<const char> string_5 = CStrVector("ooo,lll,kkk,jjj,aaa");
-  CHECK(comp.Store(string_5));
-  // string_4 compressed using string_2.
-  CheckCompression(&comp, "nnn#2:3");
-  CHECK(comp.Store(string_1));
-  // string_5 compressed using string_3.
-  CheckCompression(&comp, "ooo#2:3");
-  CHECK(comp.Store(string_4));
-  // string_1 is out of buffer by now, so it shouldn't be compressed.
-  CHECK_GE(3, kWindowSize);
-  CheckCompression(&comp, string_1);
-  CHECK(comp.Store(string_2));
-  // string_4 compressed using itself.
-  CheckCompression(&comp, "#3");
-}
-
-
-TEST(CompressorBestSelection) {
-  LogRecordCompressor comp(3);
-  const Vector<const char> string_1 = CStrVector("eee,ddd,ccc,bbb,aaa");
-  CHECK(comp.Store(string_1));
-  const Vector<const char> string_2 = CStrVector("ddd,ccc,bbb,aaa");
-  CHECK(comp.Store(string_2));
-  const Vector<const char> string_3 = CStrVector("fff,eee,ddd,ccc,bbb,aaa");
-  CHECK(comp.Store(string_3));
-  // string_2 compressed using string_1.
-  CheckCompression(&comp, "#1:4");
-  const Vector<const char> string_4 = CStrVector("nnn,hhh,ggg,fff,aaa");
-  CHECK(comp.Store(string_4));
-  // Compressing string_3 using string_1 gives a better compression than
-  // using string_2.
-  CheckCompression(&comp, "fff,#2");
-}
-
-
-TEST(CompressorCompressibility) {
-  LogRecordCompressor comp(2);
-  const Vector<const char> string_1 = CStrVector("eee,ddd,ccc,bbb,aaa");
-  CHECK(comp.Store(string_1));
-  const Vector<const char> string_2 = CStrVector("ccc,bbb,aaa");
-  CHECK(comp.Store(string_2));
-  const Vector<const char> string_3 = CStrVector("aaa");
-  CHECK(comp.Store(string_3));
-  // string_2 compressed using string_1.
-  CheckCompression(&comp, "#1:8");
-  const Vector<const char> string_4 = CStrVector("xxx");
-  CHECK(comp.Store(string_4));
-  // string_3 can't be compressed using string_2 --- too short.
-  CheckCompression(&comp, string_3);
-}
-
 #endif  // ENABLE_LOGGING_AND_PROFILING
diff --git a/deps/v8/test/cctest/test-parsing.cc b/deps/v8/test/cctest/test-parsing.cc
index badbab5eeb..e642d1b622 100755
--- a/deps/v8/test/cctest/test-parsing.cc
+++ b/deps/v8/test/cctest/test-parsing.cc
@@ -260,10 +260,12 @@ TEST(StandAlonePreParser) {
   uintptr_t stack_limit = i::StackGuard::real_climit();
   for (int i = 0; programs[i]; i++) {
     const char* program = programs[i];
-    unibrow::Utf8InputBuffer<256> stream(program, strlen(program));
+    i::Utf8ToUC16CharacterStream stream(
+        reinterpret_cast<const i::byte*>(program),
+        static_cast<unsigned>(strlen(program)));
     i::CompleteParserRecorder log;
     i::V8JavaScriptScanner scanner;
-    scanner.Initialize(i::Handle<i::String>::null(), &stream);
+    scanner.Initialize(&stream);
 
     v8::preparser::PreParser::PreParseResult result =
         v8::preparser::PreParser::PreParseProgram(&scanner,
@@ -289,9 +291,10 @@ TEST(RegressChromium62639) {
   // and then used the invalid currently scanned literal. This always
   // failed in debug mode, and sometimes crashed in release mode.
 
-  unibrow::Utf8InputBuffer<256> stream(program, strlen(program));
+  i::Utf8ToUC16CharacterStream stream(reinterpret_cast<const i::byte*>(program),
+                                      static_cast<unsigned>(strlen(program)));
   i::ScriptDataImpl* data =
-      i::ParserApi::PreParse(i::Handle<i::String>::null(), &stream, NULL);
+      i::ParserApi::PreParse(&stream, NULL);
   CHECK(data->HasError());
   delete data;
 }
@@ -310,10 +313,10 @@ TEST(Regress928) {
       "try { } catch (e) { var foo = function () { /* first */ } }"
       "var bar = function () { /* second */ }";
 
-  unibrow::Utf8InputBuffer<256> stream(program, strlen(program));
+  i::Utf8ToUC16CharacterStream stream(reinterpret_cast<const i::byte*>(program),
+                                      static_cast<unsigned>(strlen(program)));
   i::ScriptDataImpl* data =
-      i::ParserApi::PartialPreParse(i::Handle<i::String>::null(),
-                                    &stream, NULL);
+      i::ParserApi::PartialPreParse(&stream, NULL);
   CHECK(!data->HasError());
 
   data->Initialize();
@@ -347,10 +350,12 @@ TEST(PreParseOverflow) {
 
   uintptr_t stack_limit = i::StackGuard::real_climit();
 
-  unibrow::Utf8InputBuffer<256> stream(*program, strlen(*program));
+  i::Utf8ToUC16CharacterStream stream(
+      reinterpret_cast<const i::byte*>(*program),
+      static_cast<unsigned>(kProgramSize));
   i::CompleteParserRecorder log;
   i::V8JavaScriptScanner scanner;
-  scanner.Initialize(i::Handle<i::String>::null(), &stream);
+  scanner.Initialize(&stream);
 
 
   v8::preparser::PreParser::PreParseResult result =
@@ -360,3 +365,283 @@ TEST(PreParseOverflow) {
                                                 stack_limit);
   CHECK_EQ(v8::preparser::PreParser::kPreParseStackOverflow, result);
 }
+
+
+class TestExternalResource: public v8::String::ExternalStringResource {
+ public:
+  explicit TestExternalResource(uint16_t* data, int length)
+      : data_(data), length_(static_cast<size_t>(length)) { }
+
+  ~TestExternalResource() { }
+
+  const uint16_t* data() const {
+    return data_;
+  }
+
+  size_t length() const {
+    return length_;
+  }
+ private:
+  uint16_t* data_;
+  size_t length_;
+};
+
+
+#define CHECK_EQU(v1, v2) CHECK_EQ(static_cast<int>(v1), static_cast<int>(v2))
+
+void TestCharacterStream(const char* ascii_source,
+                         unsigned length,
+                         unsigned start = 0,
+                         unsigned end = 0) {
+  if (end == 0) end = length;
+  unsigned sub_length = end - start;
+  i::HandleScope test_scope;
+  i::SmartPointer<i::uc16> uc16_buffer(new i::uc16[length]);
+  for (unsigned i = 0; i < length; i++) {
+    uc16_buffer[i] = static_cast<i::uc16>(ascii_source[i]);
+  }
+  i::Vector<const char> ascii_vector(ascii_source, static_cast<int>(length));
+  i::Handle<i::String> ascii_string(
+      i::Factory::NewStringFromAscii(ascii_vector));
+  TestExternalResource resource(*uc16_buffer, length);
+  i::Handle<i::String> uc16_string(
+      i::Factory::NewExternalStringFromTwoByte(&resource));
+
+  i::ExternalTwoByteStringUC16CharacterStream uc16_stream(
+      i::Handle<i::ExternalTwoByteString>::cast(uc16_string), start, end);
+  i::GenericStringUC16CharacterStream string_stream(ascii_string, start, end);
+  i::Utf8ToUC16CharacterStream utf8_stream(
+      reinterpret_cast<const i::byte*>(ascii_source), end);
+  utf8_stream.SeekForward(start);
+
+  unsigned i = start;
+  while (i < end) {
+    // Read streams one char at a time
+    CHECK_EQU(i, uc16_stream.pos());
+    CHECK_EQU(i, string_stream.pos());
+    CHECK_EQU(i, utf8_stream.pos());
+    int32_t c0 = ascii_source[i];
+    int32_t c1 = uc16_stream.Advance();
+    int32_t c2 = string_stream.Advance();
+    int32_t c3 = utf8_stream.Advance();
+    i++;
+    CHECK_EQ(c0, c1);
+    CHECK_EQ(c0, c2);
+    CHECK_EQ(c0, c3);
+    CHECK_EQU(i, uc16_stream.pos());
+    CHECK_EQU(i, string_stream.pos());
+    CHECK_EQU(i, utf8_stream.pos());
+  }
+  while (i > start + sub_length / 4) {
+    // Pushback, re-read, pushback again.
+    int32_t c0 = ascii_source[i - 1];
+    CHECK_EQU(i, uc16_stream.pos());
+    CHECK_EQU(i, string_stream.pos());
+    CHECK_EQU(i, utf8_stream.pos());
+    uc16_stream.PushBack(c0);
+    string_stream.PushBack(c0);
+    utf8_stream.PushBack(c0);
+    i--;
+    CHECK_EQU(i, uc16_stream.pos());
+    CHECK_EQU(i, string_stream.pos());
+    CHECK_EQU(i, utf8_stream.pos());
+    int32_t c1 = uc16_stream.Advance();
+    int32_t c2 = string_stream.Advance();
+    int32_t c3 = utf8_stream.Advance();
+    i++;
+    CHECK_EQU(i, uc16_stream.pos());
+    CHECK_EQU(i, string_stream.pos());
+    CHECK_EQU(i, utf8_stream.pos());
+    CHECK_EQ(c0, c1);
+    CHECK_EQ(c0, c2);
+    CHECK_EQ(c0, c3);
+    uc16_stream.PushBack(c0);
+    string_stream.PushBack(c0);
+    utf8_stream.PushBack(c0);
+    i--;
+    CHECK_EQU(i, uc16_stream.pos());
+    CHECK_EQU(i, string_stream.pos());
+    CHECK_EQU(i, utf8_stream.pos());
+  }
+  unsigned halfway = start + sub_length / 2;
+  uc16_stream.SeekForward(halfway - i);
+  string_stream.SeekForward(halfway - i);
+  utf8_stream.SeekForward(halfway - i);
+  i = halfway;
+  CHECK_EQU(i, uc16_stream.pos());
+  CHECK_EQU(i, string_stream.pos());
+  CHECK_EQU(i, utf8_stream.pos());
+
+  while (i < end) {
+    // Read streams one char at a time
+    CHECK_EQU(i, uc16_stream.pos());
+    CHECK_EQU(i, string_stream.pos());
+    CHECK_EQU(i, utf8_stream.pos());
+    int32_t c0 = ascii_source[i];
+    int32_t c1 = uc16_stream.Advance();
+    int32_t c2 = string_stream.Advance();
+    int32_t c3 = utf8_stream.Advance();
+    i++;
+    CHECK_EQ(c0, c1);
+    CHECK_EQ(c0, c2);
+    CHECK_EQ(c0, c3);
+    CHECK_EQU(i, uc16_stream.pos());
+    CHECK_EQU(i, string_stream.pos());
+    CHECK_EQU(i, utf8_stream.pos());
+  }
+
+  int32_t c1 = uc16_stream.Advance();
+  int32_t c2 = string_stream.Advance();
+  int32_t c3 = utf8_stream.Advance();
+  CHECK_LT(c1, 0);
+  CHECK_LT(c2, 0);
+  CHECK_LT(c3, 0);
+}
+
+
+TEST(CharacterStreams) {
+  v8::HandleScope handles;
+  v8::Persistent<v8::Context> context = v8::Context::New();
+  v8::Context::Scope context_scope(context);
+
+  TestCharacterStream("abc\0\n\r\x7f", 7);
+  static const unsigned kBigStringSize = 4096;
+  char buffer[kBigStringSize + 1];
+  for (unsigned i = 0; i < kBigStringSize; i++) {
+    buffer[i] = static_cast<char>(i & 0x7f);
+  }
+  TestCharacterStream(buffer, kBigStringSize);
+
+  TestCharacterStream(buffer, kBigStringSize, 576, 3298);
+
+  TestCharacterStream("\0", 1);
+  TestCharacterStream("", 0);
+}
+
+
+TEST(Utf8CharacterStream) {
+  static const unsigned kMaxUC16CharU = unibrow::Utf8::kMaxThreeByteChar;
+  static const int kMaxUC16Char = static_cast<int>(kMaxUC16CharU);
+
+  static const int kAllUtf8CharsSize =
+      (unibrow::Utf8::kMaxOneByteChar + 1) +
+      (unibrow::Utf8::kMaxTwoByteChar - unibrow::Utf8::kMaxOneByteChar) * 2 +
+      (unibrow::Utf8::kMaxThreeByteChar - unibrow::Utf8::kMaxTwoByteChar) * 3;
+  static const unsigned kAllUtf8CharsSizeU =
+      static_cast<unsigned>(kAllUtf8CharsSize);
+
+  char buffer[kAllUtf8CharsSizeU];
+  unsigned cursor = 0;
+  for (int i = 0; i <= kMaxUC16Char; i++) {
+    cursor += unibrow::Utf8::Encode(buffer + cursor, i);
+  }
+  ASSERT(cursor == kAllUtf8CharsSizeU);
+
+  i::Utf8ToUC16CharacterStream stream(reinterpret_cast<const i::byte*>(buffer),
+                                      kAllUtf8CharsSizeU);
+  for (int i = 0; i <= kMaxUC16Char; i++) {
+    CHECK_EQU(i, stream.pos());
+    int32_t c = stream.Advance();
+    CHECK_EQ(i, c);
+    CHECK_EQU(i + 1, stream.pos());
+  }
+  for (int i = kMaxUC16Char; i >= 0; i--) {
+    CHECK_EQU(i + 1, stream.pos());
+    stream.PushBack(i);
+    CHECK_EQU(i, stream.pos());
+  }
+  int i = 0;
+  while (stream.pos() < kMaxUC16CharU) {
+    CHECK_EQU(i, stream.pos());
+    unsigned progress = stream.SeekForward(12);
+    i += progress;
+    int32_t c = stream.Advance();
+    if (i <= kMaxUC16Char) {
+      CHECK_EQ(i, c);
+    } else {
+      CHECK_EQ(-1, c);
+    }
+    i += 1;
+    CHECK_EQU(i, stream.pos());
+  }
+}
+
+#undef CHECK_EQU
+
+void TestStreamScanner(i::UC16CharacterStream* stream,
+                       i::Token::Value* expected_tokens,
+                       int skip_pos = 0,  // Zero means not skipping.
+                       int skip_to = 0) {
+  i::V8JavaScriptScanner scanner;
+  scanner.Initialize(stream, i::JavaScriptScanner::kAllLiterals);
+
+  int i = 0;
+  do {
+    i::Token::Value expected = expected_tokens[i];
+    i::Token::Value actual = scanner.Next();
+    CHECK_EQ(i::Token::String(expected), i::Token::String(actual));
+    if (scanner.location().end_pos == skip_pos) {
+      scanner.SeekForward(skip_to);
+    }
+    i++;
+  } while (expected_tokens[i] != i::Token::ILLEGAL);
+}
+
+TEST(StreamScanner) {
+  const char* str1 = "{ foo get for : */ <- \n\n /*foo*/ bib";
+  i::Utf8ToUC16CharacterStream stream1(reinterpret_cast<const i::byte*>(str1),
+                                       static_cast<unsigned>(strlen(str1)));
+  i::Token::Value expectations1[] = {
+      i::Token::LBRACE,
+      i::Token::IDENTIFIER,
+      i::Token::IDENTIFIER,
+      i::Token::FOR,
+      i::Token::COLON,
+      i::Token::MUL,
+      i::Token::DIV,
+      i::Token::LT,
+      i::Token::SUB,
+      i::Token::IDENTIFIER,
+      i::Token::EOS,
+      i::Token::ILLEGAL
+  };
+  TestStreamScanner(&stream1, expectations1, 0, 0);
+
+  const char* str2 = "case default const {THIS\nPART\nSKIPPED} do";
+  i::Utf8ToUC16CharacterStream stream2(reinterpret_cast<const i::byte*>(str2),
+                                       static_cast<unsigned>(strlen(str2)));
+  i::Token::Value expectations2[] = {
+      i::Token::CASE,
+      i::Token::DEFAULT,
+      i::Token::CONST,
+      i::Token::LBRACE,
+      // Skipped part here
+      i::Token::RBRACE,
+      i::Token::DO,
+      i::Token::EOS,
+      i::Token::ILLEGAL
+  };
+  ASSERT_EQ('{', str2[19]);
+  ASSERT_EQ('}', str2[37]);
+  TestStreamScanner(&stream2, expectations2, 20, 37);
+
+  const char* str3 = "{}}}}";
+  i::Token::Value expectations3[] = {
+      i::Token::LBRACE,
+      i::Token::RBRACE,
+      i::Token::RBRACE,
+      i::Token::RBRACE,
+      i::Token::RBRACE,
+      i::Token::EOS,
+      i::Token::ILLEGAL
+  };
+  // Skip zero-four RBRACEs.
+  for (int i = 0; i <= 4; i++) {
+     expectations3[6 - i] = i::Token::ILLEGAL;
+     expectations3[5 - i] = i::Token::EOS;
+     i::Utf8ToUC16CharacterStream stream3(
+         reinterpret_cast<const i::byte*>(str3),
+         static_cast<unsigned>(strlen(str3)));
+     TestStreamScanner(&stream3, expectations3, 1, 1 + i);
+  }
+}
diff --git a/deps/v8/test/cctest/test-profile-generator.cc b/deps/v8/test/cctest/test-profile-generator.cc
index a0733ef685..f849d404ae 100644
--- a/deps/v8/test/cctest/test-profile-generator.cc
+++ b/deps/v8/test/cctest/test-profile-generator.cc
@@ -782,12 +782,16 @@ TEST(RecordStackTraceAtStartProfiling) {
       CpuProfiler::GetProfile(NULL, 0);
   const ProfileTree* topDown = profile->top_down();
   const ProfileNode* current = topDown->root();
+  const_cast<ProfileNode*>(current)->Print(0);
   // The tree should look like this:
   //  (root)
   //   (anonymous function)
   //     a
   //       b
   //         c
+  // There can also be:
+  //           startProfiling
+  // if the sampler managed to get a tick.
   current = PickChild(current, "(anonymous function)");
   CHECK_NE(NULL, const_cast<ProfileNode*>(current));
   current = PickChild(current, "a");
@@ -796,7 +800,12 @@ TEST(RecordStackTraceAtStartProfiling) {
   CHECK_NE(NULL, const_cast<ProfileNode*>(current));
   current = PickChild(current, "c");
   CHECK_NE(NULL, const_cast<ProfileNode*>(current));
-  CHECK_EQ(0, current->children()->length());
+  CHECK(current->children()->length() == 0 ||
+        current->children()->length() == 1);
+  if (current->children()->length() == 1) {
+    current = PickChild(current, "startProfiling");
+    CHECK_EQ(0, current->children()->length());
+  }
 }
 
 
diff --git a/deps/v8/test/cctest/test-regexp.cc b/deps/v8/test/cctest/test-regexp.cc
index 3bf24a8ab1..3e6709aef4 100644
--- a/deps/v8/test/cctest/test-regexp.cc
+++ b/deps/v8/test/cctest/test-regexp.cc
@@ -173,6 +173,9 @@ TEST(Parser) {
   CHECK_PARSE_EQ("[a-b-c]", "[a-b - c]");
   CHECK_PARSE_EQ("[\\d]", "[0-9]");
   CHECK_PARSE_EQ("[x\\dz]", "[x 0-9 z]");
+  CHECK_PARSE_EQ("[\\d-z]", "[0-9 - z]");
+  CHECK_PARSE_EQ("[\\d-\\d]", "[0-9 - 0-9]");
+  CHECK_PARSE_EQ("[z-\\d]", "[z - 0-9]");
   CHECK_PARSE_EQ("\\cj\\cJ\\ci\\cI\\ck\\cK",
                  "'\\x0a\\x0a\\x09\\x09\\x0b\\x0b'");
   CHECK_PARSE_EQ("\\c!", "'c!'");
diff --git a/deps/v8/test/mjsunit/mjsunit.status b/deps/v8/test/mjsunit/mjsunit.status
index 24d9603b6b..75a5a02150 100644
--- a/deps/v8/test/mjsunit/mjsunit.status
+++ b/deps/v8/test/mjsunit/mjsunit.status
@@ -104,6 +104,11 @@ regress/regress-create-exception: SKIP
 regress/regress-3218915: SKIP
 regress/regress-3247124: SKIP
 
+##############################################################################
+[ $arch == arm && $crankshaft ]
+
+# Test that currently fail with crankshaft on ARM.
+compiler/simple-osr: FAIL
 
 ##############################################################################
 [ $arch == mips ]
diff --git a/deps/v8/test/mjsunit/object-define-property.js b/deps/v8/test/mjsunit/object-define-property.js
index b258aa75bf..780c720b51 100644
--- a/deps/v8/test/mjsunit/object-define-property.js
+++ b/deps/v8/test/mjsunit/object-define-property.js
@@ -866,4 +866,36 @@ assertFalse(desc.writable);
 assertFalse(desc.enumerable);
 assertFalse(desc.configurable);
 
+// See issue 968: http://code.google.com/p/v8/issues/detail?id=968
+var o = { x : 42 };
+Object.defineProperty(o, "x", { writable: false });
+assertEquals(42, o.x);
+o.x = 37;
+assertEquals(42, o.x);
+
+o = { x : 42 };
+Object.defineProperty(o, "x", {});
+assertEquals(42, o.x);
+o.x = 37;
+// Writability is preserved.
+assertEquals(37, o.x);
+
+var o = { };
+Object.defineProperty(o, "x", { writable: false });
+assertEquals(undefined, o.x);
+o.x = 37;
+assertEquals(undefined, o.x);
+
+o = { get x() { return 87; } };
+Object.defineProperty(o, "x", { writable: false });
+assertEquals(undefined, o.x);
+o.x = 37;
+assertEquals(undefined, o.x);
+
+// Ignore inherited properties.
+o = { __proto__ : { x : 87 } };
+Object.defineProperty(o, "x", { writable: false });
+assertEquals(undefined, o.x);
+o.x = 37;
+assertEquals(undefined, o.x);
 
diff --git a/deps/v8/test/mjsunit/regexp.js b/deps/v8/test/mjsunit/regexp.js
index 59c3ba8d28..4c1d2e315f 100644
--- a/deps/v8/test/mjsunit/regexp.js
+++ b/deps/v8/test/mjsunit/regexp.js
@@ -110,6 +110,44 @@ assertFalse(re.test("\\]"));
 assertFalse(re.test("\x03]"));  // I.e., read as \cc
 
 
+// Test that we handle \s and \S correctly inside some bizarre
+// character classes.
+re = /[\s-:]/;
+assertTrue(re.test('-'));
+assertTrue(re.test(':'));
+assertTrue(re.test(' '));
+assertTrue(re.test('\t'));
+assertTrue(re.test('\n'));
+assertFalse(re.test('a'));
+assertFalse(re.test('Z'));
+
+re = /[\S-:]/;
+assertTrue(re.test('-'));
+assertTrue(re.test(':'));
+assertFalse(re.test(' '));
+assertFalse(re.test('\t'));
+assertFalse(re.test('\n'));
+assertTrue(re.test('a'));
+assertTrue(re.test('Z'));
+
+re = /[^\s-:]/;
+assertFalse(re.test('-'));
+assertFalse(re.test(':'));
+assertFalse(re.test(' '));
+assertFalse(re.test('\t'));
+assertFalse(re.test('\n'));
+assertTrue(re.test('a'));
+assertTrue(re.test('Z'));
+
+re = /[^\S-:]/;
+assertFalse(re.test('-'));
+assertFalse(re.test(':'));
+assertTrue(re.test(' '));
+assertTrue(re.test('\t'));
+assertTrue(re.test('\n'));
+assertFalse(re.test('a'));
+assertFalse(re.test('Z'));
+
 re = /[\s]/;
 assertFalse(re.test('-'));
 assertFalse(re.test(':'));
@@ -164,6 +202,17 @@ assertFalse(re.test('\n'));
 assertFalse(re.test('a'));
 assertFalse(re.test('Z'));
 
+// First - is treated as range operator, second as literal minus.
+// This follows the specification in parsing, but doesn't throw on
+// the \s at the beginning of the range.
+re = /[\s-0-9]/;
+assertTrue(re.test(' '));
+assertTrue(re.test('\xA0'));
+assertTrue(re.test('-'));
+assertTrue(re.test('0'));
+assertTrue(re.test('9'));
+assertFalse(re.test('1'));
+
 // Test beginning and end of line assertions with or without the
 // multiline flag.
 re = /^\d+/;
@@ -610,46 +659,3 @@ assertEquals(["bc"], re.exec("zimzomzumbc"));
 assertFalse(re.test("c"));
 assertFalse(re.test(""));
 
-
-function testInvalidRange(str) {
-  try {
-    RegExp(str).test("x");
-  } catch (e) {
-    return;
-  }    
-  assetUnreachable("Allowed invalid range in " + str);
-}
-
-function testValidRange(str) {
-  try { 
-    RegExp(str).test("x");
-  } catch (e) {
-    assertUnreachable("Shouldn't fail parsing: " + str + ", was: " + e);
-  }
-}
-
-testInvalidRange("[\\d-z]");
-testInvalidRange("[z-\\d]");
-testInvalidRange("[\\d-\\d]");
-testInvalidRange("[z-x]");  // Larger value first.
-testInvalidRange("[x-\\d-\\d]");
-
-testValidRange("[x-z]");
-testValidRange("[!--\d]");  // Second "-" is end of range.
-testValidRange("[\d-]");
-testValidRange("[-\d]");
-testValidRange("[-\d-]");
-testValidRange("[^-\d-]");
-testValidRange("[^-\d-]");
-testValidRange("[0-9-\w]");
-
-// Escaped dashes do not count as range operators.
-testValidRange("[\\d\\-z]");
-testValidRange("[z\\-\\d]");
-testValidRange("[\\d\\-\\d]");
-testValidRange("[z\\-x]");
-testValidRange("[x\\-\\d\\-\\d]");
-
-
-
-
diff --git a/deps/v8/test/mjsunit/regress/regress-962.js b/deps/v8/test/mjsunit/regress/regress-962.js
new file mode 100644
index 0000000000..c0a2fdc716
--- /dev/null
+++ b/deps/v8/test/mjsunit/regress/regress-962.js
@@ -0,0 +1,53 @@
+// Copyright 2010 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
+//       disclaimer in the documentation and/or other materials provided
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+function L(scope) { this.s = new Object(); }
+
+L.prototype.c = function() { return true; }
+
+function F() {
+  this.l = [new L, new L];
+}
+
+F.prototype.foo = function () {
+    var f, d = arguments,
+        e, b = this.l,
+        g;
+    for (e = 0; e < b.length; e++) {
+        g = b[e];
+        f = g.c.apply(g.s, d);
+        if (f === false) {
+            break
+        }
+    }
+    return f
+}
+
+
+var ctx = new F;
+
+for (var i = 0; i < 10000000; i++) ctx.foo();
diff --git a/deps/v8/test/mjsunit/regress/regress-969.js b/deps/v8/test/mjsunit/regress/regress-969.js
new file mode 100644
index 0000000000..c2ba0ac9e8
--- /dev/null
+++ b/deps/v8/test/mjsunit/regress/regress-969.js
@@ -0,0 +1,127 @@
+// Copyright 2010 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
+//       disclaimer in the documentation and/or other materials provided
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Regression test for bugs when deoptimizing after assignments in effect
+// contexts.
+
+// Bug 989 is that there was an extra value on the expression stack when
+// deoptimizing after an assignment in effect context (the value of the
+// assignment was lingering).  This is hard to observe in the unoptimized
+// code.
+//
+// This test uses comma expressions to put assignments in effect contexts,
+// references to deleted global variables to force deoptimization, and
+// function calls to observe an extra value.
+
+function first(x, y) { return x; }
+var y = 0;
+var o = {};
+o.x = 0;
+o[0] = 0;
+
+// Assignment to global variable.
+x0 = 0;
+function test0() { return first((y = 1, typeof x0), 2); }
+// Call the function once to compile it.
+assertEquals('number', test0());
+// Delete to force deoptimization on the next call.
+delete x0;
+assertEquals('undefined', test0());
+
+// Compound assignment to global variable.
+x1 = 0;
+function test1() { return first((y += 1, typeof x1), 2); }
+assertEquals('number', test1(), 'test1 before');
+delete x1;
+assertEquals('undefined', test1(), 'test1 after');
+
+// Pre and post-increment of global variable.
+x2 = 0;
+function test2() { return first((++y, typeof x2), 2); }
+assertEquals('number', test2(), 'test2 before');
+delete x2;
+assertEquals('undefined', test2(), 'test2 after');
+
+x3 = 0;
+function test3() { return first((y++, typeof x3), 2); }
+assertEquals('number', test3(), 'test3 before');
+delete x3;
+assertEquals('undefined', test3(), 'test3 after');
+
+
+// Assignment, compound assignment, and pre and post-increment of named
+// properties.
+x4 = 0;
+function test4() { return first((o.x = 1, typeof x4), 2); }
+assertEquals('number', test4());
+delete x4;
+assertEquals('undefined', test4());
+
+x5 = 0;
+function test5() { return first((o.x += 1, typeof x5), 2); }
+assertEquals('number', test5());
+delete x5;
+assertEquals('undefined', test5());
+
+x6 = 0;
+function test6() { return first((++o.x, typeof x6), 2); }
+assertEquals('number', test6());
+delete x6;
+assertEquals('undefined', test6());
+
+x7 = 0;
+function test7() { return first((o.x++, typeof x7), 2); }
+assertEquals('number', test7());
+delete x7;
+assertEquals('undefined', test7());
+
+
+// Assignment, compound assignment, and pre and post-increment of indexed
+// properties.
+x8 = 0;
+function test8(index) { return first((o[index] = 1, typeof x8), 2); }
+assertEquals('number', test8());
+delete x8;
+assertEquals('undefined', test8());
+
+x9 = 0;
+function test9(index) { return first((o[index] += 1, typeof x9), 2); }
+assertEquals('number', test9());
+delete x9;
+assertEquals('undefined', test9());
+
+x10 = 0;
+function test10(index) { return first((++o[index], typeof x10), 2); }
+assertEquals('number', test10());
+delete x10;
+assertEquals('undefined', test10());
+
+x11 = 0;
+function test11(index) { return first((o[index]++, typeof x11), 2); }
+assertEquals('number', test11());
+delete x11;
+assertEquals('undefined', test11());
diff --git a/deps/v8/test/mjsunit/third_party/regexp-pcre.js b/deps/v8/test/mjsunit/third_party/regexp-pcre.js
index d9fa976855..dcb1b320fd 100644
--- a/deps/v8/test/mjsunit/third_party/regexp-pcre.js
+++ b/deps/v8/test/mjsunit/third_party/regexp-pcre.js
@@ -962,7 +962,7 @@ res[882] = /[az-]+/;
 res[883] = /[a\-z]+/;
 res[884] = /[a-z]+/;
 res[885] = /[\d-]+/;
-// res[886] - Disabled after making [\d-z] invalid to be compatible with JSC.
+res[886] = /[\d-z]+/;
 res[887] = /\x5c/;
 res[888] = /\x20Z/;
 res[889] = /ab{3cd/;
@@ -1346,7 +1346,7 @@ res[1266] = /((Z)+|A)*/;
 res[1267] = /(Z()|A)*/;
 res[1268] = /(Z(())|A)*/;
 res[1269] = /a*/g;
-// res[1270] disabled after making /^[\d-a]/ invalid to be compatible with JSC.
+res[1270] = /^[\d-a]/;
 res[1271] = /[[:space:]]+/;
 res[1272] = /[[:blank:]]+/;
 res[1273] = /[\s]+/;
@@ -2530,7 +2530,7 @@ assertEquals(null, res[431].exec("a\x0db ", 882));
 assertEquals(null, res[431].exec("a\x85b", 883));
 assertThrows("var re = /(?-+a)/;", 884);
 assertEquals(null, res[443].exec("aaaa", 885));
-// assertEquals(null, res[443].exec("bacxxx", 886));
+assertEquals(null, res[443].exec("bacxxx", 886));
 assertEquals(null, res[443].exec("bbaccxxx ", 887));
 assertEquals(null, res[443].exec("bbbacccxx", 888));
 assertEquals(null, res[443].exec("aaaa", 889));
@@ -4391,10 +4391,9 @@ assertEquals("abcdxyz", res[884].exec("abcdxyz"), 2743);
 assertEquals("12-34", res[885].exec("12-34"), 2744);
 assertEquals(null, res[885].exec("*** Failers", 2745));
 assertEquals(null, res[885].exec("aaa", 2746));
-// Disabled. To be compatible with JSC, the regexp is no longer valid.
-// assertEquals("12-34z", res[886].exec("12-34z"), 2747);
-// assertEquals(null, res[886].exec("*** Failers", 2748));
-// assertEquals(null, res[886].exec("aaa", 2749));
+assertEquals("12-34z", res[886].exec("12-34z"), 2747);
+assertEquals(null, res[886].exec("*** Failers", 2748));
+assertEquals(null, res[886].exec("aaa", 2749));
 assertEquals("\\", res[887].exec("\\\\"), 2750);
 assertEquals(" Z", res[888].exec("the Zoo"), 2751);
 assertEquals(null, res[888].exec("*** Failers", 2752));
@@ -5356,12 +5355,11 @@ assertEquals("", res[1269].exec("-things"), 3707);
 assertEquals("", res[1269].exec("0digit"), 3708);
 assertEquals("", res[1269].exec("*** Failers"), 3709);
 assertEquals("", res[1269].exec("bcdef    "), 3710);
-// Disabled. To be compatible with JSC, the RegExp is no longer valid.
-// assertEquals("a", res[1270].exec("abcde"), 3711);
-// assertEquals("-", res[1270].exec("-things"), 3712);
-// assertEquals("0", res[1270].exec("0digit"), 3713);
-// assertEquals(null, res[1270].exec("*** Failers", 3714));
-// assertEquals(null, res[1270].exec("bcdef    ", 3715));
+assertEquals("a", res[1270].exec("abcde"), 3711);
+assertEquals("-", res[1270].exec("-things"), 3712);
+assertEquals("0", res[1270].exec("0digit"), 3713);
+assertEquals(null, res[1270].exec("*** Failers", 3714));
+assertEquals(null, res[1270].exec("bcdef    ", 3715));
 assertEquals(null, res[1271].exec("> \x09\n\x0c\x0d\x0b<", 3716));
 assertEquals(null, res[1271].exec(" ", 3717));
 assertEquals(null, res[1272].exec("> \x09\n\x0c\x0d\x0b<", 3718));
diff --git a/deps/v8/test/mjsunit/tools/logreader.js b/deps/v8/test/mjsunit/tools/logreader.js
deleted file mode 100644
index 485990eaa1..0000000000
--- a/deps/v8/test/mjsunit/tools/logreader.js
+++ /dev/null
@@ -1,82 +0,0 @@
-// Copyright 2009 the V8 project authors. All rights reserved.
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-//       notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-//       copyright notice, this list of conditions and the following
-//       disclaimer in the documentation and/or other materials provided
-//       with the distribution.
-//     * Neither the name of Google Inc. nor the names of its
-//       contributors may be used to endorse or promote products derived
-//       from this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-// Load CSV Parser and Log Reader implementations from <project root>/tools.
-// Files: tools/csvparser.js tools/logreader.js
-
-
-(function testAddressParser() {
-  var reader = new devtools.profiler.LogReader({});
-  var parser = reader.createAddressParser('test');
-
-  // Test that 0x values are parsed, and prevAddresses_ are untouched.
-  assertFalse('test' in reader.prevAddresses_);
-  assertEquals(0, parser('0x0'));
-  assertFalse('test' in reader.prevAddresses_);
-  assertEquals(0x100, parser('0x100'));
-  assertFalse('test' in reader.prevAddresses_);
-  assertEquals(0xffffffff, parser('0xffffffff'));
-  assertFalse('test' in reader.prevAddresses_);
-
-  // Test that values that has no '+' or '-' prefix are parsed
-  // and saved to prevAddresses_.
-  assertEquals(0, parser('0'));
-  assertEquals(0, reader.prevAddresses_.test);
-  assertEquals(0x100, parser('100'));
-  assertEquals(0x100, reader.prevAddresses_.test);
-  assertEquals(0xffffffff, parser('ffffffff'));
-  assertEquals(0xffffffff, reader.prevAddresses_.test);
-
-  // Test that values prefixed with '+' or '-' are treated as deltas,
-  // and prevAddresses_ is updated.
-  // Set base value.
-  assertEquals(0x100, parser('100'));
-  assertEquals(0x100, reader.prevAddresses_.test);
-  assertEquals(0x200, parser('+100'));
-  assertEquals(0x200, reader.prevAddresses_.test);
-  assertEquals(0x100, parser('-100'));
-  assertEquals(0x100, reader.prevAddresses_.test);
-})();
-
-
-(function testAddressParser() {
-  var reader = new devtools.profiler.LogReader({});
-
-  assertEquals([0x10000000, 0x10001000, 0xffff000, 0x10000000],
-               reader.processStack(0x10000000, 0, ['overflow',
-                   '+1000', '-2000', '+1000']));
-})();
-
-
-(function testExpandBackRef() {
-  var reader = new devtools.profiler.LogReader({});
-
-  assertEquals('aaaaaaaa', reader.expandBackRef_('aaaaaaaa'));
-  assertEquals('aaaaaaaa', reader.expandBackRef_('#1'));
-  assertEquals('bbbbaaaa', reader.expandBackRef_('bbbb#2:4'));
-  assertEquals('"#1:1"', reader.expandBackRef_('"#1:1"'));
-})();
diff --git a/deps/v8/test/mozilla/mozilla.status b/deps/v8/test/mozilla/mozilla.status
index b1e9ba7d4d..320efe7394 100644
--- a/deps/v8/test/mozilla/mozilla.status
+++ b/deps/v8/test/mozilla/mozilla.status
@@ -53,6 +53,9 @@ def FAIL_OK = FAIL, OKAY
 # time to do so.
 js1_5/Regress/regress-271716-n: SKIP
 
+# BUG(960): This test has an insane amount of output when it times out,
+# messing up ability to see other failures on the waterfall.
+js1_5/extensions/regress-342960: SKIP
 
 # This test uses a unitialized variable. A Bug has been filed:
 # https://bugzilla.mozilla.org/show_bug.cgi?id=575575
@@ -289,10 +292,6 @@ js1_2/regexp/RegExp_multiline_as_array: FAIL_OK
 js1_2/regexp/beginLine: FAIL_OK
 js1_2/regexp/endLine: FAIL_OK
 
-# To be compatible with JSC, we no longer accept [\d-x], [x-\d] or 
-# [\d-\d] as valid ranges.
-ecma_3/RegExp/regress-375715-02: FAIL
-js1_5/extensions/regress-351463-01: FAIL
 
 # To be compatible with safari typeof a regexp yields 'function';
 # in firefox it yields 'object'.
diff --git a/deps/v8/test/sputnik/README b/deps/v8/test/sputnik/README
index 3d39a67e43..94c689bd28 100644
--- a/deps/v8/test/sputnik/README
+++ b/deps/v8/test/sputnik/README
@@ -1,6 +1,6 @@
 To run the sputniktests you must check out the test suite from
 googlecode.com.  The test expectations are currently relative to
 version 28.  To get the tests run the following command within
-v8/tests/sputnik/
+v8/test/sputnik/
 
   svn co http://sputniktests.googlecode.com/svn/trunk/ -r28 sputniktests
diff --git a/deps/v8/tools/gyp/v8.gyp b/deps/v8/tools/gyp/v8.gyp
index df8f5473a1..456fb3c331 100644
--- a/deps/v8/tools/gyp/v8.gyp
+++ b/deps/v8/tools/gyp/v8.gyp
@@ -195,6 +195,38 @@
         ],
       },
     },
+    {
+      'target_name': 'v8_preparser',
+      'include_dirs': [
+        '../../include',
+        '../../src',
+      ],
+      'sources': [
+        '../../src/allocation.cc',
+        '../../src/hashmap.cc',
+        '../../src/preparse-data.cc',
+        '../../src/preparser.cc',
+        '../../src/preparser-api.cc',
+        '../../src/scanner-base.cc',
+        '../../src/token.cc',
+        '../../src/unicode.cc',
+      ],
+      'conditions': [
+        ['OS=="win" and component=="shared_library"', {
+          'sources': [ '../../src/v8preparserdll-main.cc' ],
+          'defines': [ 'BUILDING_V8_SHARED' ],
+          'direct_dependent_settings': {
+            'defines': [ 'USING_V8_SHARED' ]
+          },
+          'type': '<(component)',
+        } , {
+          'type': 'none'
+        }],
+        ['OS!="win"', {
+          'type': '<(library)'
+        }],
+      ]
+    },
     {
       'target_name': 'v8_snapshot',
       'type': '<(library)',
diff --git a/deps/v8/tools/logreader.js b/deps/v8/tools/logreader.js
index b2aca73d21..50e3aa45c5 100644
--- a/deps/v8/tools/logreader.js
+++ b/deps/v8/tools/logreader.js
@@ -46,36 +46,6 @@ devtools.profiler.LogReader = function(dispatchTable) {
    * @type {Array.<Object>}
    */
   this.dispatchTable_ = dispatchTable;
-  this.dispatchTable_['alias'] =
-      { parsers: [null, null], processor: this.processAlias_ };
-  this.dispatchTable_['repeat'] =
-      { parsers: [parseInt, 'var-args'], processor: this.processRepeat_,
-        backrefs: true };
-
-  /**
-   * A key-value map for aliases. Translates short name -> full name.
-   * @type {Object}
-   */
-  this.aliases_ = {};
-
-  /**
-   * A key-value map for previous address values.
-   * @type {Object}
-   */
-  this.prevAddresses_ = {};
-
-  /**
-   * A key-value map for events than can be backreference-compressed.
-   * @type {Object}
-   */
-  this.backRefsCommands_ = {};
-  this.initBackRefsCommands_();
-
-  /**
-   * Back references for decompression.
-   * @type {Array.<string>}
-   */
-  this.backRefs_ = [];
 
   /**
    * Current line.
@@ -91,42 +61,6 @@ devtools.profiler.LogReader = function(dispatchTable) {
 };
 
 
-/**
- * Creates a parser for an address entry.
- *
- * @param {string} addressTag Address tag to perform offset decoding.
- * @return {function(string):number} Address parser.
- */
-devtools.profiler.LogReader.prototype.createAddressParser = function(
-    addressTag) {
-  var self = this;
-  return (function (str) {
-    var value = parseInt(str, 16);
-    var firstChar = str.charAt(0);
-    if (firstChar == '+' || firstChar == '-') {
-      var addr = self.prevAddresses_[addressTag];
-      addr += value;
-      self.prevAddresses_[addressTag] = addr;
-      return addr;
-    } else if (firstChar != '0' || str.charAt(1) != 'x') {
-      self.prevAddresses_[addressTag] = value;
-    }
-    return value;
-  });
-};
-
-
-/**
- * Expands an alias symbol, if applicable.
- *
- * @param {string} symbol Symbol to expand.
- * @return {string} Expanded symbol, or the input symbol itself.
- */
-devtools.profiler.LogReader.prototype.expandAlias = function(symbol) {
-  return symbol in this.aliases_ ? this.aliases_[symbol] : symbol;
-};
-
-
 /**
  * Used for printing error messages.
  *
@@ -233,68 +167,6 @@ devtools.profiler.LogReader.prototype.dispatchLogRow_ = function(fields) {
 };
 
 
-/**
- * Decompresses a line if it was backreference-compressed.
- *
- * @param {string} line Possibly compressed line.
- * @return {string} Decompressed line.
- * @private
- */
-devtools.profiler.LogReader.prototype.expandBackRef_ = function(line) {
-  var backRefPos;
-  // Filter out case when a regexp is created containing '#'.
-  if (line.charAt(line.length - 1) != '"'
-      && (backRefPos = line.lastIndexOf('#')) != -1) {
-    var backRef = line.substr(backRefPos + 1);
-    var backRefIdx = parseInt(backRef, 10) - 1;
-    var colonPos = backRef.indexOf(':');
-    var backRefStart =
-        colonPos != -1 ? parseInt(backRef.substr(colonPos + 1), 10) : 0;
-    line = line.substr(0, backRefPos) +
-        this.backRefs_[backRefIdx].substr(backRefStart);
-  }
-  this.backRefs_.unshift(line);
-  if (this.backRefs_.length > 10) {
-    this.backRefs_.length = 10;
-  }
-  return line;
-};
-
-
-/**
- * Initializes the map of backward reference compressible commands.
- * @private
- */
-devtools.profiler.LogReader.prototype.initBackRefsCommands_ = function() {
-  for (var event in this.dispatchTable_) {
-    var dispatch = this.dispatchTable_[event];
-    if (dispatch && dispatch.backrefs) {
-      this.backRefsCommands_[event] = true;
-    }
-  }
-};
-
-
-/**
- * Processes alias log record. Adds an alias to a corresponding map.
- *
- * @param {string} symbol Short name.
- * @param {string} expansion Long name.
- * @private
- */
-devtools.profiler.LogReader.prototype.processAlias_ = function(
-    symbol, expansion) {
-  if (expansion in this.dispatchTable_) {
-    this.dispatchTable_[symbol] = this.dispatchTable_[expansion];
-    if (expansion in this.backRefsCommands_) {
-      this.backRefsCommands_[symbol] = true;
-    }
-  } else {
-    this.aliases_[symbol] = expansion;
-  }
-};
-
-
 /**
  * Processes log lines.
  *
@@ -308,10 +180,6 @@ devtools.profiler.LogReader.prototype.processLog_ = function(lines) {
       continue;
     }
     try {
-      if (line.charAt(0) == '#' ||
-          line.substr(0, line.indexOf(',')) in this.backRefsCommands_) {
-        line = this.expandBackRef_(line);
-      }
       var fields = this.csvParser_.parseLine(line);
       this.dispatchLogRow_(fields);
     } catch (e) {
@@ -319,20 +187,3 @@ devtools.profiler.LogReader.prototype.processLog_ = function(lines) {
     }
   }
 };
-
-
-/**
- * Processes repeat log record. Expands it according to calls count and
- * invokes processing.
- *
- * @param {number} count Count.
- * @param {Array.<string>} cmd Parsed command.
- * @private
- */
-devtools.profiler.LogReader.prototype.processRepeat_ = function(count, cmd) {
-  // Replace the repeat-prefixed command from backrefs list with a non-prefixed.
-  this.backRefs_[0] = cmd.join(',');
-  for (var i = 0; i < count; ++i) {
-    this.dispatchLogRow_(cmd);
-  }
-};
diff --git a/deps/v8/tools/test.py b/deps/v8/tools/test.py
index 6aa9831879..810f8f6394 100755
--- a/deps/v8/tools/test.py
+++ b/deps/v8/tools/test.py
@@ -729,6 +729,9 @@ class Variable(Expression):
     if self.name in env: return ListSet([env[self.name]])
     else: return Nothing()
 
+  def Evaluate(self, env, defs):
+    return env[self.name]
+
 
 class Outcome(Expression):
 
@@ -1175,6 +1178,9 @@ def BuildOptions():
   result.add_option("--nostress",
                     help="Don't run crankshaft --always-opt --stress-op test",
                     default=False, action="store_true")
+  result.add_option("--crankshaft",
+                    help="Run with the --crankshaft flag",
+                    default=False, action="store_true")
   return result
 
 
@@ -1209,6 +1215,11 @@ def ProcessOptions(options):
     VARIANT_FLAGS = [['--stress-opt', '--always-opt']]
   if options.nostress:
     VARIANT_FLAGS = [[],['--nocrankshaft']]
+  if options.crankshaft:
+    if options.special_command:
+      options.special_command += " --crankshaft"
+    else:
+      options.special_command = "@--crankshaft"
   return True
 
 
@@ -1359,7 +1370,8 @@ def Main():
         'mode': mode,
         'system': utils.GuessOS(),
         'arch': options.arch,
-        'simulator': options.simulator
+        'simulator': options.simulator,
+        'crankshaft': options.crankshaft
       }
       test_list = root.ListTests([], path, context, mode)
       unclassified_tests += test_list
diff --git a/deps/v8/tools/tickprocessor.js b/deps/v8/tools/tickprocessor.js
index a3e14c3ae5..87864d1206 100644
--- a/deps/v8/tools/tickprocessor.js
+++ b/deps/v8/tools/tickprocessor.js
@@ -60,18 +60,17 @@ function inherits(childCtor, parentCtor) {
 function SnapshotLogProcessor() {
   devtools.profiler.LogReader.call(this, {
       'code-creation': {
-          parsers: [null, this.createAddressParser('code'), parseInt, null],
-          processor: this.processCodeCreation, backrefs: true },
-      'code-move': { parsers: [this.createAddressParser('code'),
-          this.createAddressParser('code-move-to')],
-          processor: this.processCodeMove, backrefs: true },
-      'code-delete': { parsers: [this.createAddressParser('code')],
-          processor: this.processCodeDelete, backrefs: true },
+          parsers: [null, parseInt, parseInt, null],
+          processor: this.processCodeCreation },
+      'code-move': { parsers: [parseInt, parseInt],
+          processor: this.processCodeMove },
+      'code-delete': { parsers: [parseInt],
+          processor: this.processCodeDelete },
       'function-creation': null,
       'function-move': null,
       'function-delete': null,
-      'snapshot-pos': { parsers: [this.createAddressParser('code'), parseInt],
-          processor: this.processSnapshotPosition, backrefs: true }});
+      'snapshot-pos': { parsers: [parseInt, parseInt],
+          processor: this.processSnapshotPosition }});
 
   Profile.prototype.handleUnknownCode = function(operation, addr) {
     var op = devtools.profiler.Profile.Operation;
@@ -95,8 +94,7 @@ inherits(SnapshotLogProcessor, devtools.profiler.LogReader);
 
 SnapshotLogProcessor.prototype.processCodeCreation = function(
     type, start, size, name) {
-  var entry = this.profile_.addCode(
-      this.expandAlias(type), name, start, size);
+  var entry = this.profile_.addCode(type, name, start, size);
 };
 
 
@@ -133,33 +131,28 @@ function TickProcessor(
       'shared-library': { parsers: [null, parseInt, parseInt],
           processor: this.processSharedLibrary },
       'code-creation': {
-          parsers: [null, this.createAddressParser('code'), parseInt, null],
-          processor: this.processCodeCreation, backrefs: true },
-      'code-move': { parsers: [this.createAddressParser('code'),
-          this.createAddressParser('code-move-to')],
-          processor: this.processCodeMove, backrefs: true },
-      'code-delete': { parsers: [this.createAddressParser('code')],
-          processor: this.processCodeDelete, backrefs: true },
-      'function-creation': { parsers: [this.createAddressParser('code'),
-          this.createAddressParser('function-obj')],
-          processor: this.processFunctionCreation, backrefs: true },
-      'function-move': { parsers: [this.createAddressParser('code'),
-          this.createAddressParser('code-move-to')],
-          processor: this.processFunctionMove, backrefs: true },
-      'function-delete': { parsers: [this.createAddressParser('code')],
-          processor: this.processFunctionDelete, backrefs: true },
-      'snapshot-pos': { parsers: [this.createAddressParser('code'), parseInt],
-          processor: this.processSnapshotPosition, backrefs: true },
-      'tick': { parsers: [this.createAddressParser('code'),
-          this.createAddressParser('stack'),
-          this.createAddressParser('func'), parseInt, 'var-args'],
-          processor: this.processTick, backrefs: true },
+          parsers: [null, parseInt, parseInt, null],
+          processor: this.processCodeCreation },
+      'code-move': { parsers: [parseInt, parseInt],
+          processor: this.processCodeMove },
+      'code-delete': { parsers: [parseInt],
+          processor: this.processCodeDelete },
+      'function-creation': { parsers: [parseInt, parseInt],
+          processor: this.processFunctionCreation },
+      'function-move': { parsers: [parseInt, parseInt],
+          processor: this.processFunctionMove },
+      'function-delete': { parsers: [parseInt],
+          processor: this.processFunctionDelete },
+      'snapshot-pos': { parsers: [parseInt, parseInt],
+          processor: this.processSnapshotPosition },
+      'tick': { parsers: [parseInt, parseInt, parseInt, parseInt, 'var-args'],
+          processor: this.processTick },
       'heap-sample-begin': { parsers: [null, null, parseInt],
           processor: this.processHeapSampleBegin },
       'heap-sample-end': { parsers: [null, null],
           processor: this.processHeapSampleEnd },
       'heap-js-prod-item': { parsers: [null, 'var-args'],
-          processor: this.processJSProducer, backrefs: true },
+          processor: this.processJSProducer },
       // Ignored events.
       'profiler': null,
       'heap-sample-stats': null,
@@ -294,8 +287,7 @@ TickProcessor.prototype.processSharedLibrary = function(
 TickProcessor.prototype.processCodeCreation = function(
     type, start, size, name) {
   name = this.deserializedEntriesNames_[start] || name;
-  var entry = this.profile_.addCode(
-      this.expandAlias(type), name, start, size);
+  var entry = this.profile_.addCode(type, name, start, size);
 };
 
 
diff --git a/deps/v8/tools/visual_studio/v8_base.vcproj b/deps/v8/tools/visual_studio/v8_base.vcproj
index fc61f46a1c..e53b3fc350 100644
--- a/deps/v8/tools/visual_studio/v8_base.vcproj
+++ b/deps/v8/tools/visual_studio/v8_base.vcproj
@@ -1,1232 +1,1280 @@
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diff --git a/deps/v8/tools/visual_studio/v8_base_arm.vcproj b/deps/v8/tools/visual_studio/v8_base_arm.vcproj
index 949e6df1c2..1054958aaf 100644
--- a/deps/v8/tools/visual_studio/v8_base_arm.vcproj
+++ b/deps/v8/tools/visual_studio/v8_base_arm.vcproj
@@ -1,1170 +1,1234 @@
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index 5abe923b55..28f299edb5 100644
--- a/deps/v8/tools/visual_studio/v8_base_x64.vcproj
+++ b/deps/v8/tools/visual_studio/v8_base_x64.vcproj
@@ -1,1152 +1,1200 @@
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+        RelativePath="..\..\src\unicode.h"
+        >
+      </File>
+      <File
+        RelativePath="..\..\src\utils.cc"
+        >
+      </File>
+      <File
+        RelativePath="..\..\src\utils.h"
+        >
+      </File>
+      <File
+        RelativePath="..\..\src\v8-counters.cc"
+        >
+      </File>
+      <File
+        RelativePath="..\..\src\v8-counters.h"
+        >
+      </File>
+      <File
+        RelativePath="..\..\src\v8.cc"
+        >
+      </File>
+      <File
+        RelativePath="..\..\src\v8.h"
+        >
+      </File>
+      <File
+        RelativePath="..\..\src\v8threads.cc"
+        >
+      </File>
+      <File
+        RelativePath="..\..\src\v8threads.h"
+        >
+      </File>
+      <File
+        RelativePath="..\..\src\variables.cc"
+        >
+      </File>
+      <File
+        RelativePath="..\..\src\variables.h"
+        >
+      </File>
+      <File
+        RelativePath="..\..\src\version.cc"
+        >
+      </File>
+      <File
+        RelativePath="..\..\src\version.h"
+        >
+      </File>
+      <File
+        RelativePath="..\..\src\virtual-frame-inl.h"
+        >
+      </File>
+      <File
+        RelativePath="..\..\src\virtual-frame-heavy-inl.h"
+        >
+      </File>
+      <File
+        RelativePath="..\..\src\virtual-frame.h"
+        >
+      </File>
+      <File
+        RelativePath="..\..\src\x64\virtual-frame-x64.h"
+        >
+      </File>
+      <File
+        RelativePath="..\..\src\virtual-frame.cc"
+        >
+      </File>
+      <File
+        RelativePath="..\..\src\x64\virtual-frame-x64.cc"
+        >
+      </File>
+      <File
+        RelativePath="..\..\src\virtual-frame-heavy.cc"
+        >
+      </File>
+      <File
+        RelativePath="..\..\src\vm-state-inl.h"
+        >
+      </File>
+      <File
+        RelativePath="..\..\src\vm-state.h"
+        >
+      </File>
+      <File
+        RelativePath="..\..\src\zone-inl.h"
+        >
+      </File>
+      <File
+        RelativePath="..\..\src\zone.cc"
+        >
+      </File>
+      <File
+        RelativePath="..\..\src\zone.h"
+        >
+      </File>
+      <Filter
+        Name="third party"
+        >
+        <File
+          RelativePath="..\..\src\x64\disasm-x64.cc"
+          >
+        </File>
+        <File
+          RelativePath="..\..\src\disasm.h"
+          >
+        </File>
+      </Filter>
+      <Filter
+        Name="generated files"
+        >
+        <File
+          RelativePath="..\..\src\unicode.cc"
+          >
+        </File>
+      </Filter>
+    </Filter>
+    <Filter
+      Name="include"
+      >
+      <File
+        RelativePath="..\..\include\v8-debug.h"
+        >
+      </File>
+      <File
+        RelativePath="..\..\include\v8-profiler.h"
+        >
+      </File>
+      <File
+        RelativePath="..\..\include\v8-testing.h"
+        >
+      </File>
+      <File
+        RelativePath="..\..\include\v8.h"
+        >
+      </File>
+    </Filter>
+  </Files>
+  <Globals>
+  </Globals>
 </VisualStudioProject>
diff --git a/deps/v8/tools/visual_studio/v8_shell_sample.vcproj b/deps/v8/tools/visual_studio/v8_shell_sample.vcproj
index b1e5f01785..4eb38bf842 100644
--- a/deps/v8/tools/visual_studio/v8_shell_sample.vcproj
+++ b/deps/v8/tools/visual_studio/v8_shell_sample.vcproj
@@ -37,6 +37,7 @@
 			/>
 			<Tool
 				Name="VCCLCompilerTool"
+        AdditionalIncludeDirectories="$(ProjectDir)\..\..\include"
 			/>
 			<Tool
 				Name="VCManagedResourceCompilerTool"
@@ -95,6 +96,7 @@
 			/>
 			<Tool
 				Name="VCCLCompilerTool"
+        AdditionalIncludeDirectories="$(ProjectDir)\..\..\include"
 			/>
 			<Tool
 				Name="VCManagedResourceCompilerTool"
diff --git a/deps/v8/tools/visual_studio/v8_shell_sample_arm.vcproj b/deps/v8/tools/visual_studio/v8_shell_sample_arm.vcproj
index a14c91a458..b4260e02b5 100644
--- a/deps/v8/tools/visual_studio/v8_shell_sample_arm.vcproj
+++ b/deps/v8/tools/visual_studio/v8_shell_sample_arm.vcproj
@@ -37,6 +37,7 @@
 			/>
 			<Tool
 				Name="VCCLCompilerTool"
+        AdditionalIncludeDirectories="$(ProjectDir)\..\..\include"
 			/>
 			<Tool
 				Name="VCManagedResourceCompilerTool"
@@ -95,6 +96,7 @@
 			/>
 			<Tool
 				Name="VCCLCompilerTool"
+        AdditionalIncludeDirectories="$(ProjectDir)\..\..\include"
 			/>
 			<Tool
 				Name="VCManagedResourceCompilerTool"
diff --git a/deps/v8/tools/visual_studio/v8_shell_sample_x64.vcproj b/deps/v8/tools/visual_studio/v8_shell_sample_x64.vcproj
index 44d7b12c79..9ba6703b7c 100644
--- a/deps/v8/tools/visual_studio/v8_shell_sample_x64.vcproj
+++ b/deps/v8/tools/visual_studio/v8_shell_sample_x64.vcproj
@@ -37,7 +37,8 @@
 			/>
 			<Tool
 				Name="VCCLCompilerTool"
-			/>
+        AdditionalIncludeDirectories="$(ProjectDir)\..\..\include"
+        />
 			<Tool
 				Name="VCManagedResourceCompilerTool"
 			/>
@@ -95,6 +96,7 @@
 			/>
 			<Tool
 				Name="VCCLCompilerTool"
+        AdditionalIncludeDirectories="$(ProjectDir)\..\..\include"
 			/>
 			<Tool
 				Name="VCManagedResourceCompilerTool"