chromium/v8/src/heap/memory-chunk.h

// Copyright 2023 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 V8_HEAP_MEMORY_CHUNK_H_
#define V8_HEAP_MEMORY_CHUNK_H_

#include "src/base/build_config.h"
#include "src/base/functional.h"
#include "src/flags/flags.h"

#if V8_ENABLE_STICKY_MARK_BITS_BOOL
#define UNREACHABLE_WITH_STICKY_MARK_BITS …
#else
#define UNREACHABLE_WITH_STICKY_MARK_BITS …
#endif

namespace v8 {
internal  // namespace internal

namespace base {

// Define special hash function for chunk pointers, to be used with std data
// structures, e.g.
// std::unordered_set<MemoryChunk*, base::hash<MemoryChunk*>
// This hash function discards the trailing zero bits (chunk alignment).
// Notice that, when pointer compression is enabled, it also discards the
// cage base.
template <>
struct hash<const i::MemoryChunk*> { … };

template <>
struct hash<i::MemoryChunk*> { … };

}  // namespace base

}  // namespace v8

#undef UNREACHABLE_WITH_STICKY_MARK_BITS

#endif  // V8_HEAP_MEMORY_CHUNK_H_