1// Copyright 2016 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_LOOKUP_CACHE_INL_H_
6#define V8_LOOKUP_CACHE_INL_H_
7
8#include "src/lookup-cache.h"
9
10#include "src/objects-inl.h"
11
12namespace v8 {
13namespace internal {
14
15// static
16int 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_field();
21 return (source_hash ^ name_hash) % kLength;
22}
23
24int DescriptorLookupCache::Lookup(Map source, Name name) {
25 int index = Hash(source, name);
26 Key& key = keys_[index];
27 if ((key.source == source) && (key.name == name)) return results_[index];
28 return kAbsent;
29}
30
31void DescriptorLookupCache::Update(Map source, Name name, int result) {
32 DCHECK_NE(result, kAbsent);
33 int index = Hash(source, name);
34 Key& key = keys_[index];
35 key.source = source;
36 key.name = name;
37 results_[index] = result;
38}
39
40} // namespace internal
41} // namespace v8
42
43#endif // V8_LOOKUP_CACHE_INL_H_
44