Debugger: move implementation to a separate folder.

src/arm/debug-arm.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_ARM
-
-#include "src/codegen.h"
-#include "src/debug.h"
-
-namespace v8 {
-namespace internal {
-
-#define __ ACCESS_MASM(masm)
-
-
-void EmitDebugBreakSlot(MacroAssembler* masm) {
-  Label check_size;
-  __ bind(&check_size);
-  for (int i = 0; i < Assembler::kDebugBreakSlotInstructions; i++) {
-    __ nop(MacroAssembler::DEBUG_BREAK_NOP);
-  }
-  DCHECK_EQ(Assembler::kDebugBreakSlotInstructions,
-            masm->InstructionsGeneratedSince(&check_size));
-}
-
-
-void DebugCodegen::GenerateSlot(MacroAssembler* masm, RelocInfo::Mode mode,
-                                int call_argc) {
-  // Generate enough nop's to make space for a call instruction. Avoid emitting
-  // the constant pool in the debug break slot code.
-  Assembler::BlockConstPoolScope block_const_pool(masm);
-  masm->RecordDebugBreakSlot(mode, call_argc);
-  EmitDebugBreakSlot(masm);
-}
-
-
-void DebugCodegen::ClearDebugBreakSlot(Address pc) {
-  CodePatcher patcher(pc, Assembler::kDebugBreakSlotInstructions);
-  EmitDebugBreakSlot(patcher.masm());
-}
-
-
-void DebugCodegen::PatchDebugBreakSlot(Address pc, Handle<Code> code) {
-  DCHECK_EQ(Code::BUILTIN, code->kind());
-  CodePatcher patcher(pc, Assembler::kDebugBreakSlotInstructions);
-  // Patch the code changing the debug break slot code from
-  //   mov r2, r2
-  //   mov r2, r2
-  //   mov r2, r2
-  //   mov r2, r2
-  // to a call to the debug break slot code.
-  //   ldr ip, [pc, #0]
-  //   b skip
-  //   <debug break slot code entry point address>
-  //   skip:
-  //   blx ip
-  Label skip_constant;
-  patcher.masm()->ldr(ip, MemOperand(v8::internal::pc, 0));
-  patcher.masm()->b(&skip_constant);
-  patcher.Emit(code->entry());
-  patcher.masm()->bind(&skip_constant);
-  patcher.masm()->blx(ip);
-}
-
-
-void DebugCodegen::GenerateDebugBreakStub(MacroAssembler* masm,
-                                          DebugBreakCallHelperMode mode) {
-  __ RecordComment("Debug break");
-  {
-    FrameAndConstantPoolScope scope(masm, StackFrame::INTERNAL);
-
-    // Load padding words on stack.
-    __ mov(ip, Operand(Smi::FromInt(LiveEdit::kFramePaddingValue)));
-    for (int i = 0; i < LiveEdit::kFramePaddingInitialSize; i++) {
-      __ push(ip);
-    }
-    __ mov(ip, Operand(Smi::FromInt(LiveEdit::kFramePaddingInitialSize)));
-    __ push(ip);
-
-    if (mode == SAVE_RESULT_REGISTER) __ push(r0);
-
-    __ mov(r0, Operand::Zero());  // no arguments
-    __ mov(r1,
-           Operand(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)};
-        __ mov(reg, Operand(kDebugZapValue));
-      }
-    }
-
-    if (mode == SAVE_RESULT_REGISTER) __ pop(r0);
-
-    // Don't bother removing padding bytes pushed on the stack
-    // as the frame is going to be restored right away.
-
-    // Leave the internal frame.
-  }
-
-  // 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());
-  __ mov(ip, Operand(after_break_target));
-  __ ldr(ip, MemOperand(ip));
-  __ Jump(ip);
-}
-
-
-void DebugCodegen::GeneratePlainReturnLiveEdit(MacroAssembler* masm) {
-  __ Ret();
-}
-
-
-void DebugCodegen::GenerateFrameDropperLiveEdit(MacroAssembler* masm) {
-  ExternalReference restarter_frame_function_slot =
-      ExternalReference::debug_restarter_frame_function_pointer_address(
-          masm->isolate());
-  __ mov(ip, Operand(restarter_frame_function_slot));
-  __ mov(r1, Operand::Zero());
-  __ str(r1, MemOperand(ip, 0));
-
-  // Load the function pointer off of our current stack frame.
-  __ ldr(r1, MemOperand(fp,
-         StandardFrameConstants::kConstantPoolOffset - kPointerSize));
-
-  // Pop return address, frame and constant pool pointer (if
-  // FLAG_enable_embedded_constant_pool).
-  __ LeaveFrame(StackFrame::INTERNAL);
-
-  { ConstantPoolUnavailableScope constant_pool_unavailable(masm);
-    // Load context from the function.
-    __ ldr(cp, FieldMemOperand(r1, JSFunction::kContextOffset));
-
-    // Get function code.
-    __ ldr(ip, FieldMemOperand(r1, JSFunction::kSharedFunctionInfoOffset));
-    __ ldr(ip, FieldMemOperand(ip, SharedFunctionInfo::kCodeOffset));
-    __ add(ip, ip, Operand(Code::kHeaderSize - kHeapObjectTag));
-
-    // Re-run JSFunction, r1 is function, cp is context.
-    __ Jump(ip);
-  }
-}
-
-
-const bool LiveEdit::kFrameDropperSupported = true;
-
-#undef __
-
-}  // namespace internal
-}  // namespace v8
-
-#endif  // V8_TARGET_ARCH_ARM