mirror of https://github.com/lukechilds/node.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
309 lines
10 KiB
309 lines
10 KiB
// 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 "v8.h"
|
|
|
|
#if defined(V8_TARGET_ARCH_IA32)
|
|
|
|
#include "codegen-inl.h"
|
|
#include "debug.h"
|
|
|
|
|
|
namespace v8 {
|
|
namespace internal {
|
|
|
|
#ifdef ENABLE_DEBUGGER_SUPPORT
|
|
|
|
bool BreakLocationIterator::IsDebugBreakAtReturn() {
|
|
return Debug::IsDebugBreakAtReturn(rinfo());
|
|
}
|
|
|
|
|
|
// Patch the JS frame exit code with a debug break call. See
|
|
// CodeGenerator::VisitReturnStatement and VirtualFrame::Exit in codegen-ia32.cc
|
|
// for the precise return instructions sequence.
|
|
void BreakLocationIterator::SetDebugBreakAtReturn() {
|
|
ASSERT(Assembler::kJSReturnSequenceLength >=
|
|
Assembler::kCallInstructionLength);
|
|
rinfo()->PatchCodeWithCall(Debug::debug_break_return()->entry(),
|
|
Assembler::kJSReturnSequenceLength - Assembler::kCallInstructionLength);
|
|
}
|
|
|
|
|
|
// Restore the JS frame exit code.
|
|
void BreakLocationIterator::ClearDebugBreakAtReturn() {
|
|
rinfo()->PatchCode(original_rinfo()->pc(),
|
|
Assembler::kJSReturnSequenceLength);
|
|
}
|
|
|
|
|
|
// A debug break in the frame exit code is identified by the JS frame exit code
|
|
// having been patched with a call instruction.
|
|
bool Debug::IsDebugBreakAtReturn(RelocInfo* rinfo) {
|
|
ASSERT(RelocInfo::IsJSReturn(rinfo->rmode()));
|
|
return rinfo->IsPatchedReturnSequence();
|
|
}
|
|
|
|
|
|
bool BreakLocationIterator::IsDebugBreakAtSlot() {
|
|
ASSERT(IsDebugBreakSlot());
|
|
// Check whether the debug break slot instructions have been patched.
|
|
return rinfo()->IsPatchedDebugBreakSlotSequence();
|
|
}
|
|
|
|
|
|
void BreakLocationIterator::SetDebugBreakAtSlot() {
|
|
ASSERT(IsDebugBreakSlot());
|
|
rinfo()->PatchCodeWithCall(
|
|
Debug::debug_break_slot()->entry(),
|
|
Assembler::kDebugBreakSlotLength - Assembler::kCallInstructionLength);
|
|
}
|
|
|
|
|
|
void BreakLocationIterator::ClearDebugBreakAtSlot() {
|
|
ASSERT(IsDebugBreakSlot());
|
|
rinfo()->PatchCode(original_rinfo()->pc(), Assembler::kDebugBreakSlotLength);
|
|
}
|
|
|
|
|
|
#define __ ACCESS_MASM(masm)
|
|
|
|
|
|
static void Generate_DebugBreakCallHelper(MacroAssembler* masm,
|
|
RegList object_regs,
|
|
RegList non_object_regs,
|
|
bool convert_call_to_jmp) {
|
|
// Enter an internal frame.
|
|
__ EnterInternalFrame();
|
|
|
|
// Store the registers containing live values on the expression stack to
|
|
// make sure that these are correctly updated during GC. Non object values
|
|
// are stored as a smi causing it to be untouched by GC.
|
|
ASSERT((object_regs & ~kJSCallerSaved) == 0);
|
|
ASSERT((non_object_regs & ~kJSCallerSaved) == 0);
|
|
ASSERT((object_regs & non_object_regs) == 0);
|
|
for (int i = 0; i < kNumJSCallerSaved; i++) {
|
|
int r = JSCallerSavedCode(i);
|
|
Register reg = { r };
|
|
if ((object_regs & (1 << r)) != 0) {
|
|
__ push(reg);
|
|
}
|
|
if ((non_object_regs & (1 << r)) != 0) {
|
|
if (FLAG_debug_code) {
|
|
__ test(reg, Immediate(0xc0000000));
|
|
__ Assert(zero, "Unable to encode value as smi");
|
|
}
|
|
__ SmiTag(reg);
|
|
__ push(reg);
|
|
}
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
__ RecordComment("// Calling from debug break to runtime - come in - over");
|
|
#endif
|
|
__ Set(eax, Immediate(0)); // no arguments
|
|
__ mov(ebx, Immediate(ExternalReference::debug_break()));
|
|
|
|
CEntryStub ceb(1);
|
|
__ CallStub(&ceb);
|
|
|
|
// Restore the register values containing object pointers from the expression
|
|
// stack.
|
|
for (int i = kNumJSCallerSaved; --i >= 0;) {
|
|
int r = JSCallerSavedCode(i);
|
|
Register reg = { r };
|
|
if (FLAG_debug_code) {
|
|
__ Set(reg, Immediate(kDebugZapValue));
|
|
}
|
|
if ((object_regs & (1 << r)) != 0) {
|
|
__ pop(reg);
|
|
}
|
|
if ((non_object_regs & (1 << r)) != 0) {
|
|
__ pop(reg);
|
|
__ SmiUntag(reg);
|
|
}
|
|
}
|
|
|
|
// Get rid of the internal frame.
|
|
__ LeaveInternalFrame();
|
|
|
|
// If this call did not replace a call but patched other code then there will
|
|
// be an unwanted return address left on the stack. Here we get rid of that.
|
|
if (convert_call_to_jmp) {
|
|
__ add(Operand(esp), Immediate(kPointerSize));
|
|
}
|
|
|
|
// Now that the break point has been handled, resume normal execution by
|
|
// jumping to the target address intended by the caller and that was
|
|
// overwritten by the address of DebugBreakXXX.
|
|
ExternalReference after_break_target =
|
|
ExternalReference(Debug_Address::AfterBreakTarget());
|
|
__ jmp(Operand::StaticVariable(after_break_target));
|
|
}
|
|
|
|
|
|
void Debug::GenerateLoadICDebugBreak(MacroAssembler* masm) {
|
|
// Register state for IC load call (from ic-ia32.cc).
|
|
// ----------- S t a t e -------------
|
|
// -- eax : receiver
|
|
// -- ecx : name
|
|
// -----------------------------------
|
|
Generate_DebugBreakCallHelper(masm, eax.bit() | ecx.bit(), 0, false);
|
|
}
|
|
|
|
|
|
void Debug::GenerateStoreICDebugBreak(MacroAssembler* masm) {
|
|
// Register state for IC store call (from ic-ia32.cc).
|
|
// ----------- S t a t e -------------
|
|
// -- eax : value
|
|
// -- ecx : name
|
|
// -- edx : receiver
|
|
// -----------------------------------
|
|
Generate_DebugBreakCallHelper(
|
|
masm, eax.bit() | ecx.bit() | edx.bit(), 0, false);
|
|
}
|
|
|
|
|
|
void Debug::GenerateKeyedLoadICDebugBreak(MacroAssembler* masm) {
|
|
// Register state for keyed IC load call (from ic-ia32.cc).
|
|
// ----------- S t a t e -------------
|
|
// -- edx : receiver
|
|
// -- eax : key
|
|
// -----------------------------------
|
|
Generate_DebugBreakCallHelper(masm, eax.bit() | edx.bit(), 0, false);
|
|
}
|
|
|
|
|
|
void Debug::GenerateKeyedStoreICDebugBreak(MacroAssembler* masm) {
|
|
// Register state for keyed IC load call (from ic-ia32.cc).
|
|
// ----------- S t a t e -------------
|
|
// -- eax : value
|
|
// -- ecx : key
|
|
// -- edx : receiver
|
|
// -----------------------------------
|
|
Generate_DebugBreakCallHelper(
|
|
masm, eax.bit() | ecx.bit() | edx.bit(), 0, false);
|
|
}
|
|
|
|
|
|
void Debug::GenerateCallICDebugBreak(MacroAssembler* masm) {
|
|
// Register state for keyed IC call call (from ic-ia32.cc)
|
|
// ----------- S t a t e -------------
|
|
// -- ecx: name
|
|
// -----------------------------------
|
|
Generate_DebugBreakCallHelper(masm, ecx.bit(), 0, false);
|
|
}
|
|
|
|
|
|
void Debug::GenerateConstructCallDebugBreak(MacroAssembler* masm) {
|
|
// Register state just before return from JS function (from codegen-ia32.cc).
|
|
// eax is the actual number of arguments not encoded as a smi see comment
|
|
// above IC call.
|
|
// ----------- S t a t e -------------
|
|
// -- eax: number of arguments (not smi)
|
|
// -- edi: constructor function
|
|
// -----------------------------------
|
|
// The number of arguments in eax is not smi encoded.
|
|
Generate_DebugBreakCallHelper(masm, edi.bit(), eax.bit(), false);
|
|
}
|
|
|
|
|
|
void Debug::GenerateReturnDebugBreak(MacroAssembler* masm) {
|
|
// Register state just before return from JS function (from codegen-ia32.cc).
|
|
// ----------- S t a t e -------------
|
|
// -- eax: return value
|
|
// -----------------------------------
|
|
Generate_DebugBreakCallHelper(masm, eax.bit(), 0, true);
|
|
}
|
|
|
|
|
|
void Debug::GenerateStubNoRegistersDebugBreak(MacroAssembler* masm) {
|
|
// Register state for stub CallFunction (from CallFunctionStub in ic-ia32.cc).
|
|
// ----------- S t a t e -------------
|
|
// No registers used on entry.
|
|
// -----------------------------------
|
|
Generate_DebugBreakCallHelper(masm, 0, 0, false);
|
|
}
|
|
|
|
|
|
void Debug::GenerateSlot(MacroAssembler* masm) {
|
|
// Generate enough nop's to make space for a call instruction.
|
|
Label check_codesize;
|
|
__ bind(&check_codesize);
|
|
__ RecordDebugBreakSlot();
|
|
for (int i = 0; i < Assembler::kDebugBreakSlotLength; i++) {
|
|
__ nop();
|
|
}
|
|
ASSERT_EQ(Assembler::kDebugBreakSlotLength,
|
|
masm->SizeOfCodeGeneratedSince(&check_codesize));
|
|
}
|
|
|
|
|
|
void Debug::GenerateSlotDebugBreak(MacroAssembler* masm) {
|
|
// In the places where a debug break slot is inserted no registers can contain
|
|
// object pointers.
|
|
Generate_DebugBreakCallHelper(masm, 0, 0, true);
|
|
}
|
|
|
|
|
|
void Debug::GeneratePlainReturnLiveEdit(MacroAssembler* masm) {
|
|
masm->ret(0);
|
|
}
|
|
|
|
|
|
void Debug::GenerateFrameDropperLiveEdit(MacroAssembler* masm) {
|
|
ExternalReference restarter_frame_function_slot =
|
|
ExternalReference(Debug_Address::RestarterFrameFunctionPointer());
|
|
__ mov(Operand::StaticVariable(restarter_frame_function_slot), Immediate(0));
|
|
|
|
// We do not know our frame height, but set esp based on ebp.
|
|
__ lea(esp, Operand(ebp, -1 * kPointerSize));
|
|
|
|
__ pop(edi); // Function.
|
|
__ pop(ebp);
|
|
|
|
// Load context from the function.
|
|
__ mov(esi, FieldOperand(edi, JSFunction::kContextOffset));
|
|
|
|
// Get function code.
|
|
__ mov(edx, FieldOperand(edi, JSFunction::kSharedFunctionInfoOffset));
|
|
__ mov(edx, FieldOperand(edx, SharedFunctionInfo::kCodeOffset));
|
|
__ lea(edx, FieldOperand(edx, Code::kHeaderSize));
|
|
|
|
// Re-run JSFunction, edi is function, esi is context.
|
|
__ jmp(Operand(edx));
|
|
}
|
|
|
|
const bool Debug::kFrameDropperSupported = true;
|
|
|
|
#undef __
|
|
|
|
#endif // ENABLE_DEBUGGER_SUPPORT
|
|
|
|
} } // namespace v8::internal
|
|
|
|
#endif // V8_TARGET_ARCH_IA32
|
|
|