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// 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)) +
api_constants::kGuardPageSize);
}
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 ==
api_constants::kGuardPageSize);
}
HeapHandle& heap_handle_;
};
} // namespace internal
} // namespace cppgc
#endif // INCLUDE_CPPGC_INTERNAL_BASE_PAGE_HANDLE_H_
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