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@ -29,7 +29,9 @@ |
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#include "bootstrapper.h" |
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#include "codegen-inl.h" |
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#include "assembler-x64.h" |
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#include "macro-assembler-x64.h" |
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#include "debug.h" |
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namespace v8 { |
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namespace internal { |
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@ -43,8 +45,152 @@ MacroAssembler::MacroAssembler(void* buffer, int size) |
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} |
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void MacroAssembler::TailCallRuntime(ExternalReference const& a, int b) { |
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UNIMPLEMENTED(); |
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void MacroAssembler::Assert(Condition cc, const char* msg) { |
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if (FLAG_debug_code) Check(cc, msg); |
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} |
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void MacroAssembler::Check(Condition cc, const char* msg) { |
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Label L; |
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j(cc, &L); |
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Abort(msg); |
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// will not return here
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bind(&L); |
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} |
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void MacroAssembler::ConstructAndTestJSFunction() { |
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const int initial_buffer_size = 4 * KB; |
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char* buffer = new char[initial_buffer_size]; |
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MacroAssembler masm(buffer, initial_buffer_size); |
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const uint64_t secret = V8_INT64_C(0xdeadbeefcafebabe); |
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Handle<String> constant = |
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Factory::NewStringFromAscii(Vector<const char>("451", 3), TENURED); |
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#define __ ACCESS_MASM((&masm)) |
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// Construct a simple JSfunction here, using Assembler and MacroAssembler
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// commands.
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__ movq(rax, constant, RelocInfo::EMBEDDED_OBJECT); |
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__ push(rax); |
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__ CallRuntime(Runtime::kStringParseFloat, 1); |
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__ movq(kScratchRegister, secret, RelocInfo::NONE); |
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__ addq(rax, kScratchRegister); |
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__ ret(0); |
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#undef __ |
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CodeDesc desc; |
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masm.GetCode(&desc); |
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Code::Flags flags = Code::ComputeFlags(Code::FUNCTION); |
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Object* code = Heap::CreateCode(desc, NULL, flags, Handle<Object>::null()); |
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if (!code->IsFailure()) { |
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Handle<Code> code_handle(Code::cast(code)); |
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Handle<String> name = |
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Factory::NewStringFromAscii(Vector<const char>("foo", 3), NOT_TENURED); |
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Handle<JSFunction> function = |
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Factory::NewFunction(name, |
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JS_FUNCTION_TYPE, |
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JSObject::kHeaderSize, |
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code_handle, |
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true); |
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bool pending_exceptions; |
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Handle<Object> result = |
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Execution::Call(function, |
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Handle<Object>::cast(function), |
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0, |
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NULL, |
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&pending_exceptions); |
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CHECK(result->IsSmi()); |
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CHECK(secret + (451 << kSmiTagSize) == reinterpret_cast<uint64_t>(*result)); |
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} |
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} |
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void MacroAssembler::Abort(const char* msg) { |
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// We want to pass the msg string like a smi to avoid GC
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// problems, however msg is not guaranteed to be aligned
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// properly. Instead, we pass an aligned pointer that is
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// a proper v8 smi, but also pass the alignment difference
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// from the real pointer as a smi.
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intptr_t p1 = reinterpret_cast<intptr_t>(msg); |
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intptr_t p0 = (p1 & ~kSmiTagMask) + kSmiTag; |
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// Note: p0 might not be a valid Smi *value*, but it has a valid Smi tag.
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ASSERT(reinterpret_cast<Object*>(p0)->IsSmi()); |
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#ifdef DEBUG |
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if (msg != NULL) { |
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RecordComment("Abort message: "); |
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RecordComment(msg); |
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} |
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#endif |
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push(rax); |
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movq(kScratchRegister, p0, RelocInfo::NONE); |
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push(kScratchRegister); |
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movq(kScratchRegister, |
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reinterpret_cast<intptr_t>(Smi::FromInt(p1 - p0)), |
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RelocInfo::NONE); |
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push(kScratchRegister); |
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CallRuntime(Runtime::kAbort, 2); |
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// will not return here
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} |
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void MacroAssembler::CallStub(CodeStub* stub) { |
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ASSERT(allow_stub_calls()); // calls are not allowed in some stubs
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movq(kScratchRegister, stub->GetCode(), RelocInfo::CODE_TARGET); |
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call(kScratchRegister); |
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} |
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void MacroAssembler::StubReturn(int argc) { |
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ASSERT(argc >= 1 && generating_stub()); |
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ret((argc - 1) * kPointerSize); |
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} |
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void MacroAssembler::IllegalOperation(int num_arguments) { |
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if (num_arguments > 0) { |
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addq(rsp, Immediate(num_arguments * kPointerSize)); |
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} |
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movq(rax, Factory::undefined_value(), RelocInfo::EMBEDDED_OBJECT); |
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} |
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void MacroAssembler::CallRuntime(Runtime::FunctionId id, int num_arguments) { |
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CallRuntime(Runtime::FunctionForId(id), num_arguments); |
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} |
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void MacroAssembler::CallRuntime(Runtime::Function* f, int num_arguments) { |
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// If the expected number of arguments of the runtime function is
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// constant, we check that the actual number of arguments match the
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// expectation.
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if (f->nargs >= 0 && f->nargs != num_arguments) { |
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IllegalOperation(num_arguments); |
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return; |
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} |
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Runtime::FunctionId function_id = |
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static_cast<Runtime::FunctionId>(f->stub_id); |
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RuntimeStub stub(function_id, num_arguments); |
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CallStub(&stub); |
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} |
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void MacroAssembler::TailCallRuntime(ExternalReference const& ext, |
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int num_arguments) { |
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// TODO(1236192): Most runtime routines don't need the number of
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// arguments passed in because it is constant. At some point we
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// should remove this need and make the runtime routine entry code
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// smarter.
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movq(rax, Immediate(num_arguments)); |
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JumpToBuiltin(ext); |
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} |
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void MacroAssembler::JumpToBuiltin(const ExternalReference& ext) { |
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// Set the entry point and jump to the C entry runtime stub.
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movq(rbx, ext); |
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CEntryStub ces; |
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movq(kScratchRegister, ces.GetCode(), RelocInfo::CODE_TARGET); |
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jmp(kScratchRegister); |
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} |
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@ -71,18 +217,43 @@ void MacroAssembler::Set(const Operand& dst, int64_t x) { |
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} |
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void MacroAssembler::Jump(ExternalReference ext) { |
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movq(kScratchRegister, ext); |
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jmp(kScratchRegister); |
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} |
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void MacroAssembler::Jump(Address destination, RelocInfo::Mode rmode) { |
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movq(kScratchRegister, destination, rmode); |
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jmp(kScratchRegister); |
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} |
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void MacroAssembler::Call(ExternalReference ext) { |
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movq(kScratchRegister, ext); |
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call(kScratchRegister); |
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} |
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void MacroAssembler::Call(Address destination, RelocInfo::Mode rmode) { |
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movq(kScratchRegister, destination, rmode); |
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call(kScratchRegister); |
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} |
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void MacroAssembler::PushTryHandler(CodeLocation try_location, |
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HandlerType type) { |
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// The pc (return address) is already on TOS.
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// This code pushes state, code, frame pointer and parameter pointer.
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// Check that they are expected next on the stack, int that order.
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// Adjust this code if not the case.
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ASSERT(StackHandlerConstants::kSize == 4 * kPointerSize); |
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// The pc (return address) is already on TOS. This code pushes state,
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// frame pointer and current handler. Check that they are expected
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// next on the stack, in that order.
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ASSERT_EQ(StackHandlerConstants::kStateOffset, |
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StackHandlerConstants::kPCOffset - kPointerSize); |
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ASSERT_EQ(StackHandlerConstants::kCodeOffset, |
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StackHandlerConstants::kStateOffset - kPointerSize); |
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ASSERT_EQ(StackHandlerConstants::kFPOffset, |
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StackHandlerConstants::kCodeOffset - kPointerSize); |
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ASSERT_EQ(StackHandlerConstants::kPPOffset, |
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StackHandlerConstants::kStateOffset - kPointerSize); |
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ASSERT_EQ(StackHandlerConstants::kNextOffset, |
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StackHandlerConstants::kFPOffset - kPointerSize); |
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if (try_location == IN_JAVASCRIPT) { |
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@ -91,26 +262,414 @@ void MacroAssembler::PushTryHandler(CodeLocation try_location, |
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} else { |
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push(Immediate(StackHandler::TRY_FINALLY)); |
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} |
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push(Immediate(Smi::FromInt(StackHandler::kCodeNotPresent))); |
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push(rbp); |
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push(rdi); |
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} else { |
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ASSERT(try_location == IN_JS_ENTRY); |
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// The parameter pointer is meaningless here and ebp does not
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// point to a JS frame. So we save NULL for both pp and ebp. We
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// expect the code throwing an exception to check ebp before
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// dereferencing it to restore the context.
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// The frame pointer does not point to a JS frame so we save NULL
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// for rbp. We expect the code throwing an exception to check rbp
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// before dereferencing it to restore the context.
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push(Immediate(StackHandler::ENTRY)); |
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push(Immediate(Smi::FromInt(StackHandler::kCodeNotPresent))); |
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push(Immediate(0)); // NULL frame pointer
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push(Immediate(0)); // NULL parameter pointer
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push(Immediate(0)); // NULL frame pointer.
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} |
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// Save the current handler.
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movq(kScratchRegister, ExternalReference(Top::k_handler_address)); |
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// Cached TOS.
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movq(rax, Operand(kScratchRegister, 0)); |
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push(Operand(kScratchRegister, 0)); |
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// Link this handler.
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movq(Operand(kScratchRegister, 0), rsp); |
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} |
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void MacroAssembler::Ret() { |
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ret(0); |
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} |
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void MacroAssembler::CmpObjectType(Register heap_object, |
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InstanceType type, |
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Register map) { |
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movq(map, FieldOperand(heap_object, HeapObject::kMapOffset)); |
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CmpInstanceType(map, type); |
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} |
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void MacroAssembler::CmpInstanceType(Register map, InstanceType type) { |
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cmpb(FieldOperand(map, Map::kInstanceTypeOffset), |
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Immediate(static_cast<int8_t>(type))); |
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} |
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void MacroAssembler::SetCounter(StatsCounter* counter, int value) { |
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if (FLAG_native_code_counters && counter->Enabled()) { |
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movq(kScratchRegister, ExternalReference(counter)); |
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movl(Operand(kScratchRegister, 0), Immediate(value)); |
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} |
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} |
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void MacroAssembler::IncrementCounter(StatsCounter* counter, int value) { |
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ASSERT(value > 0); |
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if (FLAG_native_code_counters && counter->Enabled()) { |
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movq(kScratchRegister, ExternalReference(counter)); |
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Operand operand(kScratchRegister, 0); |
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if (value == 1) { |
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incl(operand); |
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} else { |
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addl(operand, Immediate(value)); |
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} |
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} |
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} |
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void MacroAssembler::DecrementCounter(StatsCounter* counter, int value) { |
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ASSERT(value > 0); |
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if (FLAG_native_code_counters && counter->Enabled()) { |
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movq(kScratchRegister, ExternalReference(counter)); |
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Operand operand(kScratchRegister, 0); |
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if (value == 1) { |
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decl(operand); |
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} else { |
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subl(operand, Immediate(value)); |
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} |
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} |
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} |
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#ifdef ENABLE_DEBUGGER_SUPPORT |
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void MacroAssembler::PushRegistersFromMemory(RegList regs) { |
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ASSERT((regs & ~kJSCallerSaved) == 0); |
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// Push the content of the memory location to the stack.
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for (int i = 0; i < kNumJSCallerSaved; i++) { |
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int r = JSCallerSavedCode(i); |
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if ((regs & (1 << r)) != 0) { |
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ExternalReference reg_addr = |
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ExternalReference(Debug_Address::Register(i)); |
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movq(kScratchRegister, reg_addr); |
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push(Operand(kScratchRegister, 0)); |
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} |
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} |
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} |
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void MacroAssembler::SaveRegistersToMemory(RegList regs) { |
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ASSERT((regs & ~kJSCallerSaved) == 0); |
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// Copy the content of registers to memory location.
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for (int i = 0; i < kNumJSCallerSaved; i++) { |
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int r = JSCallerSavedCode(i); |
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if ((regs & (1 << r)) != 0) { |
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Register reg = { r }; |
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ExternalReference reg_addr = |
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ExternalReference(Debug_Address::Register(i)); |
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movq(kScratchRegister, reg_addr); |
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movq(Operand(kScratchRegister, 0), reg); |
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} |
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} |
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} |
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void MacroAssembler::RestoreRegistersFromMemory(RegList regs) { |
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ASSERT((regs & ~kJSCallerSaved) == 0); |
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// Copy the content of memory location to registers.
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for (int i = kNumJSCallerSaved - 1; i >= 0; i--) { |
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int r = JSCallerSavedCode(i); |
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if ((regs & (1 << r)) != 0) { |
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Register reg = { r }; |
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ExternalReference reg_addr = |
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ExternalReference(Debug_Address::Register(i)); |
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movq(kScratchRegister, reg_addr); |
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movq(reg, Operand(kScratchRegister, 0)); |
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} |
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} |
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} |
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void MacroAssembler::PopRegistersToMemory(RegList regs) { |
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ASSERT((regs & ~kJSCallerSaved) == 0); |
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// Pop the content from the stack to the memory location.
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for (int i = kNumJSCallerSaved - 1; i >= 0; i--) { |
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int r = JSCallerSavedCode(i); |
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if ((regs & (1 << r)) != 0) { |
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ExternalReference reg_addr = |
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ExternalReference(Debug_Address::Register(i)); |
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movq(kScratchRegister, reg_addr); |
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pop(Operand(kScratchRegister, 0)); |
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} |
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} |
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} |
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void MacroAssembler::CopyRegistersFromStackToMemory(Register base, |
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Register scratch, |
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RegList regs) { |
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ASSERT(!scratch.is(kScratchRegister)); |
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ASSERT(!base.is(kScratchRegister)); |
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ASSERT(!base.is(scratch)); |
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ASSERT((regs & ~kJSCallerSaved) == 0); |
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// Copy the content of the stack to the memory location and adjust base.
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for (int i = kNumJSCallerSaved - 1; i >= 0; i--) { |
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int r = JSCallerSavedCode(i); |
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if ((regs & (1 << r)) != 0) { |
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movq(scratch, Operand(base, 0)); |
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ExternalReference reg_addr = |
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ExternalReference(Debug_Address::Register(i)); |
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movq(kScratchRegister, reg_addr); |
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movq(Operand(kScratchRegister, 0), scratch); |
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lea(base, Operand(base, kPointerSize)); |
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} |
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} |
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} |
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#endif // ENABLE_DEBUGGER_SUPPORT
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void MacroAssembler::InvokePrologue(const ParameterCount& expected, |
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const ParameterCount& actual, |
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Handle<Code> code_constant, |
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Register code_register, |
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Label* done, |
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InvokeFlag flag) { |
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bool definitely_matches = false; |
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Label invoke; |
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if (expected.is_immediate()) { |
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ASSERT(actual.is_immediate()); |
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if (expected.immediate() == actual.immediate()) { |
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definitely_matches = true; |
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} else { |
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movq(rax, Immediate(actual.immediate())); |
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if (expected.immediate() == |
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SharedFunctionInfo::kDontAdaptArgumentsSentinel) { |
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// Don't worry about adapting arguments for built-ins that
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// don't want that done. Skip adaption code by making it look
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// like we have a match between expected and actual number of
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// arguments.
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definitely_matches = true; |
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} else { |
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movq(rbx, Immediate(expected.immediate())); |
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} |
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} |
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} else { |
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if (actual.is_immediate()) { |
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// Expected is in register, actual is immediate. This is the
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// case when we invoke function values without going through the
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// IC mechanism.
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cmpq(expected.reg(), Immediate(actual.immediate())); |
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j(equal, &invoke); |
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ASSERT(expected.reg().is(rbx)); |
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movq(rax, Immediate(actual.immediate())); |
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} else if (!expected.reg().is(actual.reg())) { |
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// Both expected and actual are in (different) registers. This
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// is the case when we invoke functions using call and apply.
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cmpq(expected.reg(), actual.reg()); |
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j(equal, &invoke); |
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ASSERT(actual.reg().is(rax)); |
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ASSERT(expected.reg().is(rbx)); |
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} |
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} |
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if (!definitely_matches) { |
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Handle<Code> adaptor = |
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Handle<Code>(Builtins::builtin(Builtins::ArgumentsAdaptorTrampoline)); |
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if (!code_constant.is_null()) { |
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movq(rdx, code_constant, RelocInfo::EMBEDDED_OBJECT); |
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addq(rdx, Immediate(Code::kHeaderSize - kHeapObjectTag)); |
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} else if (!code_register.is(rdx)) { |
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movq(rdx, code_register); |
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} |
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movq(kScratchRegister, adaptor, RelocInfo::CODE_TARGET); |
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if (flag == CALL_FUNCTION) { |
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call(kScratchRegister); |
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jmp(done); |
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} else { |
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jmp(kScratchRegister); |
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} |
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bind(&invoke); |
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} |
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} |
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void MacroAssembler::InvokeCode(Register code, |
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const ParameterCount& expected, |
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const ParameterCount& actual, |
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InvokeFlag flag) { |
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Label done; |
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InvokePrologue(expected, actual, Handle<Code>::null(), code, &done, flag); |
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if (flag == CALL_FUNCTION) { |
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call(code); |
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} else { |
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ASSERT(flag == JUMP_FUNCTION); |
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jmp(code); |
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} |
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bind(&done); |
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} |
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void MacroAssembler::InvokeCode(Handle<Code> code, |
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const ParameterCount& expected, |
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const ParameterCount& actual, |
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RelocInfo::Mode rmode, |
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InvokeFlag flag) { |
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Label done; |
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Register dummy = rax; |
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InvokePrologue(expected, actual, code, dummy, &done, flag); |
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movq(kScratchRegister, code, rmode); |
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if (flag == CALL_FUNCTION) { |
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call(kScratchRegister); |
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} else { |
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ASSERT(flag == JUMP_FUNCTION); |
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jmp(kScratchRegister); |
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} |
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bind(&done); |
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} |
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void MacroAssembler::InvokeFunction(Register function, |
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const ParameterCount& actual, |
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InvokeFlag flag) { |
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ASSERT(function.is(rdi)); |
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movq(rdx, FieldOperand(function, JSFunction::kSharedFunctionInfoOffset)); |
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movq(rsi, FieldOperand(function, JSFunction::kContextOffset)); |
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movl(rbx, FieldOperand(rdx, SharedFunctionInfo::kFormalParameterCountOffset)); |
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movq(rdx, FieldOperand(rdx, SharedFunctionInfo::kCodeOffset)); |
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// Advances rdx to the end of the Code object headers, to the start of
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// the executable code.
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lea(rdx, FieldOperand(rdx, Code::kHeaderSize)); |
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ParameterCount expected(rbx); |
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InvokeCode(rdx, expected, actual, flag); |
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} |
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void MacroAssembler::EnterFrame(StackFrame::Type type) { |
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push(rbp); |
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movq(rbp, rsp); |
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push(rsi); // Context.
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push(Immediate(Smi::FromInt(type))); |
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movq(kScratchRegister, CodeObject(), RelocInfo::EMBEDDED_OBJECT); |
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push(kScratchRegister); |
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if (FLAG_debug_code) { |
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movq(kScratchRegister, |
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Factory::undefined_value(), |
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RelocInfo::EMBEDDED_OBJECT); |
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cmpq(Operand(rsp, 0), kScratchRegister); |
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Check(not_equal, "code object not properly patched"); |
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} |
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} |
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void MacroAssembler::LeaveFrame(StackFrame::Type type) { |
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if (FLAG_debug_code) { |
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movq(kScratchRegister, Immediate(Smi::FromInt(type))); |
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cmpq(Operand(rbp, StandardFrameConstants::kMarkerOffset), kScratchRegister); |
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Check(equal, "stack frame types must match"); |
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} |
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movq(rsp, rbp); |
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pop(rbp); |
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} |
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void MacroAssembler::EnterExitFrame(StackFrame::Type type) { |
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ASSERT(type == StackFrame::EXIT || type == StackFrame::EXIT_DEBUG); |
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// Setup the frame structure on the stack.
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ASSERT(ExitFrameConstants::kCallerSPDisplacement == +2 * kPointerSize); |
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ASSERT(ExitFrameConstants::kCallerPCOffset == +1 * kPointerSize); |
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ASSERT(ExitFrameConstants::kCallerFPOffset == 0 * kPointerSize); |
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push(rbp); |
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movq(rbp, rsp); |
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// Reserve room for entry stack pointer and push the debug marker.
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ASSERT(ExitFrameConstants::kSPOffset == -1 * kPointerSize); |
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push(Immediate(0)); // saved entry sp, patched before call
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push(Immediate(type == StackFrame::EXIT_DEBUG ? 1 : 0)); |
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// Save the frame pointer and the context in top.
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ExternalReference c_entry_fp_address(Top::k_c_entry_fp_address); |
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ExternalReference context_address(Top::k_context_address); |
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movq(rdi, rax); // Backup rax before we use it.
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movq(rax, rbp); |
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store_rax(c_entry_fp_address); |
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movq(rax, rsi); |
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store_rax(context_address); |
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// Setup argv in callee-saved register r15. It is reused in LeaveExitFrame,
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// so it must be retained across the C-call.
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int offset = StandardFrameConstants::kCallerSPOffset - kPointerSize; |
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lea(r15, Operand(rbp, rdi, kTimesPointerSize, offset)); |
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#ifdef ENABLE_DEBUGGER_SUPPORT |
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// Save the state of all registers to the stack from the memory
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// location. This is needed to allow nested break points.
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if (type == StackFrame::EXIT_DEBUG) { |
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// TODO(1243899): This should be symmetric to
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// CopyRegistersFromStackToMemory() but it isn't! esp is assumed
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// correct here, but computed for the other call. Very error
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// prone! FIX THIS. Actually there are deeper problems with
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// register saving than this asymmetry (see the bug report
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// associated with this issue).
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PushRegistersFromMemory(kJSCallerSaved); |
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} |
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#endif |
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// Reserve space for two arguments: argc and argv
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subq(rsp, Immediate(2 * kPointerSize)); |
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// Get the required frame alignment for the OS.
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static const int kFrameAlignment = OS::ActivationFrameAlignment(); |
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if (kFrameAlignment > 0) { |
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ASSERT(IsPowerOf2(kFrameAlignment)); |
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movq(kScratchRegister, Immediate(-kFrameAlignment)); |
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and_(rsp, kScratchRegister); |
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} |
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// Patch the saved entry sp.
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movq(Operand(rbp, ExitFrameConstants::kSPOffset), rsp); |
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} |
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void MacroAssembler::LeaveExitFrame(StackFrame::Type type) { |
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// Registers:
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// r15 : argv
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#ifdef ENABLE_DEBUGGER_SUPPORT |
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// Restore the memory copy of the registers by digging them out from
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// the stack. This is needed to allow nested break points.
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if (type == StackFrame::EXIT_DEBUG) { |
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// It's okay to clobber register ebx below because we don't need
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// the function pointer after this.
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const int kCallerSavedSize = kNumJSCallerSaved * kPointerSize; |
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int kOffset = ExitFrameConstants::kDebugMarkOffset - kCallerSavedSize; |
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lea(rbx, Operand(rbp, kOffset)); |
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CopyRegistersFromStackToMemory(rbx, rcx, kJSCallerSaved); |
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} |
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#endif |
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// Get the return address from the stack and restore the frame pointer.
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movq(rcx, Operand(rbp, 1 * kPointerSize)); |
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movq(rbp, Operand(rbp, 0 * kPointerSize)); |
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// Pop the arguments and the receiver from the caller stack.
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lea(rsp, Operand(r15, 1 * kPointerSize)); |
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// Restore current context from top and clear it in debug mode.
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ExternalReference context_address(Top::k_context_address); |
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movq(kScratchRegister, context_address); |
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movq(rsi, Operand(kScratchRegister, 0)); |
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#ifdef DEBUG |
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movq(Operand(kScratchRegister, 0), Immediate(0)); |
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#endif |
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// Push the return address to get ready to return.
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push(rcx); |
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// Clear the top frame.
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ExternalReference c_entry_fp_address(Top::k_c_entry_fp_address); |
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movq(kScratchRegister, c_entry_fp_address); |
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movq(Operand(kScratchRegister, 0), Immediate(0)); |
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} |
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} } // namespace v8::internal
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Ryan
16 years ago