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_OBJECTS_LOOKUP_CACHE_INL_H_ 6 #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 namespace v8 { 13 namespace internal { 14 15 // static Hash(Map source,Name name)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_field(); 21 return (source_hash ^ name_hash) % kLength; 22 } 23 Lookup(Map source,Name name)24 int 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 Update(Map source,Name name,int result)31 void 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_OBJECTS_LOOKUP_CACHE_INL_H_ 44