Debugger: move implementation to a separate folder.

src/ia32/debug-ia32.cc

-// Copyright 2012 the V8 project authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "src/v8.h"
-
-#if V8_TARGET_ARCH_IA32
-
-#include "src/codegen.h"
-#include "src/debug.h"
-
-
-namespace v8 {
-namespace internal {
-
-#define __ ACCESS_MASM(masm)
-
-
-void EmitDebugBreakSlot(MacroAssembler* masm) {
-  Label check_codesize;
-  __ bind(&check_codesize);
-  __ Nop(Assembler::kDebugBreakSlotLength);
-  DCHECK_EQ(Assembler::kDebugBreakSlotLength,
-            masm->SizeOfCodeGeneratedSince(&check_codesize));
-}
-
-
-void DebugCodegen::GenerateSlot(MacroAssembler* masm, RelocInfo::Mode mode,
-                                int call_argc) {
-  // Generate enough nop's to make space for a call instruction.
-  masm->RecordDebugBreakSlot(mode, call_argc);
-  EmitDebugBreakSlot(masm);
-}
-
-
-void DebugCodegen::ClearDebugBreakSlot(Address pc) {
-  CodePatcher patcher(pc, Assembler::kDebugBreakSlotLength);
-  EmitDebugBreakSlot(patcher.masm());
-}
-
-
-void DebugCodegen::PatchDebugBreakSlot(Address pc, Handle<Code> code) {
-  DCHECK_EQ(Code::BUILTIN, code->kind());
-  static const int kSize = Assembler::kDebugBreakSlotLength;
-  CodePatcher patcher(pc, kSize);
-
-  // Add a label for checking the size of the code used for returning.
-  Label check_codesize;
-  patcher.masm()->bind(&check_codesize);
-  patcher.masm()->call(code->entry(), RelocInfo::NONE32);
-  // Check that the size of the code generated is as expected.
-  DCHECK_EQ(kSize, patcher.masm()->SizeOfCodeGeneratedSince(&check_codesize));
-}
-
-
-void DebugCodegen::GenerateDebugBreakStub(MacroAssembler* masm,
-                                          DebugBreakCallHelperMode mode) {
-  __ RecordComment("Debug break");
-
-  // Enter an internal frame.
-  {
-    FrameScope scope(masm, StackFrame::INTERNAL);
-
-    // Load padding words on stack.
-    for (int i = 0; i < LiveEdit::kFramePaddingInitialSize; i++) {
-      __ push(Immediate(Smi::FromInt(LiveEdit::kFramePaddingValue)));
-    }
-    __ push(Immediate(Smi::FromInt(LiveEdit::kFramePaddingInitialSize)));
-
-    if (mode == SAVE_RESULT_REGISTER) __ push(eax);
-
-    __ Move(eax, Immediate(0));  // No arguments.
-    __ mov(ebx,
-           Immediate(ExternalReference(
-               Runtime::FunctionForId(Runtime::kDebugBreak), masm->isolate())));
-
-    CEntryStub ceb(masm->isolate(), 1);
-    __ CallStub(&ceb);
-
-    if (FLAG_debug_code) {
-      for (int i = 0; i < kNumJSCallerSaved; ++i) {
-        Register reg = {JSCallerSavedCode(i)};
-        __ Move(reg, Immediate(kDebugZapValue));
-      }
-    }
-
-    if (mode == SAVE_RESULT_REGISTER) __ pop(eax);
-
-    __ pop(ebx);
-    // We divide stored value by 2 (untagging) and multiply it by word's size.
-    STATIC_ASSERT(kSmiTagSize == 1 && kSmiShiftSize == 0);
-    __ lea(esp, Operand(esp, ebx, times_half_pointer_size, 0));
-
-    // Get rid of the internal frame.
-  }
-
-  // This call did not replace a call , so there will be an unwanted
-  // return address left on the stack. Here we get rid of that.
-  __ add(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_after_break_target_address(masm->isolate());
-  __ jmp(Operand::StaticVariable(after_break_target));
-}
-
-
-void DebugCodegen::GeneratePlainReturnLiveEdit(MacroAssembler* masm) {
-  masm->ret(0);
-}
-
-
-void DebugCodegen::GenerateFrameDropperLiveEdit(MacroAssembler* masm) {
-  ExternalReference restarter_frame_function_slot =
-      ExternalReference::debug_restarter_frame_function_pointer_address(
-          masm->isolate());
-  __ 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(edx);
-}
-
-
-const bool LiveEdit::kFrameDropperSupported = true;
-
-#undef __
-
-}  // namespace internal
-}  // namespace v8
-
-#endif  // V8_TARGET_ARCH_IA32