lookup-cache-inl.h 1.19 KB
Newer Older
1 2 3 4
// Copyright 2016 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.

5 6
#ifndef V8_OBJECTS_LOOKUP_CACHE_INL_H_
#define V8_OBJECTS_LOOKUP_CACHE_INL_H_
7

8
#include "src/objects/lookup-cache.h"
9

10
#include "src/objects/objects-inl.h"
11 12 13 14 15

namespace v8 {
namespace internal {

// static
16
int DescriptorLookupCache::Hash(Map source, Name name) {
17
  DCHECK(name.IsUniqueName());
18
  // Uses only lower 32 bits if pointers are larger.
19
  uint32_t source_hash = static_cast<uint32_t>(source.ptr()) >> kTaggedSizeLog2;
20
  uint32_t name_hash = name.hash();
21 22 23
  return (source_hash ^ name_hash) % kLength;
}

24
int DescriptorLookupCache::Lookup(Map source, Name name) {
25 26 27 28 29 30
  int index = Hash(source, name);
  Key& key = keys_[index];
  if ((key.source == source) && (key.name == name)) return results_[index];
  return kAbsent;
}

31
void DescriptorLookupCache::Update(Map source, Name name, int result) {
32
  DCHECK_NE(result, kAbsent);
33 34 35 36 37 38 39 40 41
  int index = Hash(source, name);
  Key& key = keys_[index];
  key.source = source;
  key.name = name;
  results_[index] = result;
}

}  // namespace internal
}  // namespace v8
42

43
#endif  // V8_OBJECTS_LOOKUP_CACHE_INL_H_