Line data    Source code

       1             : // Copyright 2019 the V8 project authors. All rights reserved.
       2             : // Use of this source code is governed by a BSD-style license that can be
       3             : // found in the LICENSE file.
       4             : 
       5             : #ifndef V8_HASH_SEED_INL_H_
       6             : #define V8_HASH_SEED_INL_H_
       7             : 
       8             : #include <stdint.h>
       9             : 
      10             : // The #includes below currently lead to cyclic transitive includes, so
      11             : // HashSeed() ends up being required before it is defined, so we have to
      12             : // declare it here. This is a workaround; if we needed this permanently then
      13             : // we should put that line into a "hash-seed.h" header; but we won't need
      14             : // it for long.
      15             : // TODO(jkummerow): Get rid of this by breaking circular include dependencies.
      16             : namespace v8 {
      17             : namespace internal {
      18             : 
      19             : class Isolate;
      20             : 
      21             : inline uint64_t HashSeed(Isolate* isolate);
      22             : 
      23             : }  // namespace internal
      24             : }  // namespace v8
      25             : 
      26             : // See comment above for why this isn't at the top of the file.
      27             : #include "src/objects/fixed-array-inl.h"
      28             : #include "src/roots-inl.h"
      29             : 
      30             : namespace v8 {
      31             : namespace internal {
      32             : 
      33   261684361 : inline uint64_t HashSeed(Isolate* isolate) {
      34             :   uint64_t seed;
      35             :   ReadOnlyRoots(isolate).hash_seed()->copy_out(
      36             :       0, reinterpret_cast<byte*>(&seed), kInt64Size);
      37             :   DCHECK(FLAG_randomize_hashes || seed == 0);
      38   261684322 :   return seed;
      39             : }
      40             : 
      41             : }  // namespace internal
      42             : }  // namespace v8
      43             : 
      44             : #endif  // V8_HASH_SEED_INL_H_