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base-page-handle.h1.4 KB · 44 lines
// Copyright 2022 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_INTERNAL_BASE_PAGE_HANDLE_H_#define INCLUDE_CPPGC_INTERNAL_BASE_PAGE_HANDLE_H_ #include "cppgc/heap-handle.h"#include "cppgc/internal/api-constants.h"#include "cppgc/internal/logging.h"#include "v8config.h"  // NOLINT(build/include_directory) namespace cppgc {namespace internal { // The class is needed in the header to allow for fast access to HeapHandle in// the write barrier.class BasePageHandle { public:  static V8_INLINE BasePageHandle* FromPayload(void* payload) {    return reinterpret_cast<BasePageHandle*>(        reinterpret_cast<uintptr_t>(payload) & ~(api_constants::kPageSize - 1));  }  static V8_INLINE const BasePageHandle* FromPayload(const void* payload) {    return FromPayload(const_cast<void*>(payload));  }   HeapHandle& heap_handle() { return heap_handle_; }  const HeapHandle& heap_handle() const { return heap_handle_; }  protected:  explicit BasePageHandle(HeapHandle& heap_handle) : heap_handle_(heap_handle) {    CPPGC_DCHECK(reinterpret_cast<uintptr_t>(this) % api_constants::kPageSize ==                 0);  }   HeapHandle& heap_handle_;}; }  // namespace internal}  // namespace cppgc #endif  // INCLUDE_CPPGC_INTERNAL_BASE_PAGE_HANDLE_H_