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// 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.
#ifndef V8_OBJECTS_LOOKUP_CACHE_INL_H_
#define V8_OBJECTS_LOOKUP_CACHE_INL_H_
#include "src/objects/lookup-cache.h"
#include "src/objects/map.h"
#include "src/objects/name-inl.h"
namespace v8 {
namespace internal {
// static
int DescriptorLookupCache::Hash(Tagged<Map> source, Tagged<Name> name) {
DCHECK(IsUniqueName(name));
// Uses only lower 32 bits if pointers are larger.
uint32_t source_hash = static_cast<uint32_t>(source.ptr()) >> kTaggedSizeLog2;
uint32_t name_hash = name->hash();
return (source_hash ^ name_hash) % kLength;
}
int DescriptorLookupCache::Lookup(Tagged<Map> source, Tagged<Name> name) {
int index = Hash(source, name);
Key& key = keys_[index];
// Pointers in the table might be stale, so use SafeEquals.
if (key.source.SafeEquals(source) && key.name.SafeEquals(name)) {
return results_[index];
}
return kAbsent;
}
void DescriptorLookupCache::Update(Tagged<Map> source, Tagged<Name> name,
int result) {
DCHECK_NE(result, kAbsent);
int index = Hash(source, name);
Key& key = keys_[index];
key.source = source;
key.name = name;
results_[index] = result;
}
} // namespace internal
} // namespace v8
#endif // V8_OBJECTS_LOOKUP_CACHE_INL_H_
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