src/v8/src/numbers/hash-seed-inl.h

// Copyright 2019 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_NUMBERS_HASH_SEED_INL_H_
#define V8_NUMBERS_HASH_SEED_INL_H_

#include <stdint.h>

// The #includes below currently lead to cyclic transitive includes, so
// HashSeed() ends up being required before it is defined, so we have to
// declare it here. This is a workaround; if we needed this permanently then
// we should put that line into a "hash-seed.h" header; but we won't need
// it for long.
// TODO(jkummerow): Get rid of this by breaking circular include dependencies.
namespace v8 {
namespace internal {

class Isolate;
class ReadOnlyRoots;

// TODO(v8:7464): Remove the Isolate version of this.
inline uint64_t HashSeed(Isolate* isolate);
inline uint64_t HashSeed(ReadOnlyRoots roots);

}  // namespace internal
}  // namespace v8

// See comment above for why this isn't at the top of the file.
#include "src/objects/fixed-array-inl.h"
#include "src/roots/roots-inl.h"

namespace v8 {
namespace internal {

inline uint64_t HashSeed(Isolate* isolate) {
  return HashSeed(ReadOnlyRoots(isolate));
}

inline uint64_t HashSeed(ReadOnlyRoots roots) {
  uint64_t seed;
  roots.hash_seed().copy_out(0, reinterpret_cast<byte*>(&seed), kInt64Size);
  DCHECK(FLAG_randomize_hashes || seed == 0);
  return seed;
}

}  // namespace internal
}  // namespace v8

#endif  // V8_NUMBERS_HASH_SEED_INL_H_