third_party/v8/src/debug/arm64/debug-arm64.cc

// Copyright 2013 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.

#if V8_TARGET_ARCH_ARM64

#include "src/debug/debug.h"

#include "src/codegen/arm64/macro-assembler-arm64-inl.h"
#include "src/debug/liveedit.h"
#include "src/execution/frame-constants.h"
#include "src/execution/frames-inl.h"
#include "src/objects/objects-inl.h"

namespace v8 {
namespace internal {

#define __ ACCESS_MASM(masm)

void DebugCodegen::GenerateHandleDebuggerStatement(MacroAssembler* masm) {
  {
    FrameScope scope(masm, StackFrame::INTERNAL);
    __ CallRuntime(Runtime::kHandleDebuggerStatement, 0);
  }
  __ MaybeDropFrames();

  // Return to caller.
  __ Ret();
}

void DebugCodegen::GenerateFrameDropperTrampoline(MacroAssembler* masm) {
  // Frame is being dropped:
  // - Drop to the target frame specified by x1.
  // - Look up current function on the frame.
  // - Leave the frame.
  // - Restart the frame by calling the function.
  __ Mov(fp, x1);
  __ Ldr(x1, MemOperand(fp, StandardFrameConstants::kFunctionOffset));

  __ Mov(sp, fp);
  __ Pop<TurboAssembler::kAuthLR>(fp, lr);

  __ LoadTaggedPointerField(
      x0, FieldMemOperand(x1, JSFunction::kSharedFunctionInfoOffset));
  __ Ldrh(x0,
          FieldMemOperand(x0, SharedFunctionInfo::kFormalParameterCountOffset));
  __ mov(x3, x0);

  __ InvokeFunctionWithNewTarget(x1, x3, x0, JUMP_FUNCTION);
}


const bool LiveEdit::kFrameDropperSupported = true;

}  // namespace internal
}  // namespace v8

#undef __

#endif  // V8_TARGET_ARCH_ARM64