common.h

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// Copyright 2020 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.
 
#ifndef INCLUDE_CPPGC_COMMON_H_
#define INCLUDE_CPPGC_COMMON_H_
 
#include "cppgc/macros.h"
#include "v8config.h"  // NOLINT(build/include_directory)
 
#if V8_CC_MSVC
#include <intrin.h>  // _AddressOfReturnAddress()
#endif
 
namespace cppgc {
 
enum class EmbedderStackState {
  kMayContainHeapPointers,
  kNoHeapPointers,
};
 
class V8_EXPORT V8_NODISCARD StackStartScope final {
  CPPGC_STACK_ALLOCATED();
 
 public:
#if V8_CC_MSVC
  explicit StackStartScope(void* stack_start = _AddressOfReturnAddress());
#else
  explicit StackStartScope(void* stack_start = __builtin_frame_address(0));
#endif
  ~StackStartScope();
 
  StackStartScope(const StackStartScope&) = delete;
  StackStartScope& operator=(const StackStartScope&) = delete;
 
 private:
  void* const previous_stack_start_;
};
 
}  // namespace cppgc
 
#endif  // INCLUDE_CPPGC_COMMON_H_