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 12 namespace v8 { 13 namespace internal { 14 15 // static 16 int DescriptorLookupCache::Hash(Object* source, Name* name) { 17 DCHECK(name->IsUniqueName()); 18 // Uses only lower 32 bits if pointers are larger. 19 uint32_t source_hash = 20 static_cast<uint32_t>(reinterpret_cast<uintptr_t>(source)) >> 21 kPointerSizeLog2; 22 uint32_t name_hash = name->hash_field(); 23 return (source_hash ^ name_hash) % kLength; 24 } 25 26 int DescriptorLookupCache::Lookup(Map* source, Name* name) { 27 int index = Hash(source, name); 28 Key& key = keys_[index]; 29 if ((key.source == source) && (key.name == name)) return results_[index]; 30 return kAbsent; 31 } 32 33 void DescriptorLookupCache::Update(Map* source, Name* name, int result) { 34 DCHECK_NE(result, kAbsent); 35 int index = Hash(source, name); 36 Key& key = keys_[index]; 37 key.source = source; 38 key.name = name; 39 results_[index] = result; 40 } 41 42 } // namespace internal 43 } // namespace v8 44 45 #endif // V8_LOOKUP_CACHE_INL_H_ 46
