1// Copyright 2014 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_COMPILER_NODE_CACHE_H_ 6#define V8_COMPILER_NODE_CACHE_H_ 7 8#include "src/v8.h" 9 10#include "src/compiler/node.h" 11 12namespace v8 { 13namespace internal { 14namespace compiler { 15 16// A cache for nodes based on a key. Useful for implementing canonicalization of 17// nodes such as constants, parameters, etc. 18template <typename Key> 19class NodeCache { 20 public: 21 explicit NodeCache(int max = 256) : entries_(NULL), size_(0), max_(max) {} 22 23 // Search for node associated with {key} and return a pointer to a memory 24 // location in this cache that stores an entry for the key. If the location 25 // returned by this method contains a non-NULL node, the caller can use that 26 // node. Otherwise it is the responsibility of the caller to fill the entry 27 // with a new node. 28 // Note that a previous cache entry may be overwritten if the cache becomes 29 // too full or encounters too many hash collisions. 30 Node** Find(Zone* zone, Key key); 31 32 private: 33 struct Entry { 34 Key key_; 35 Node* value_; 36 }; 37 38 Entry* entries_; // lazily-allocated hash entries. 39 int32_t size_; 40 int32_t max_; 41 42 bool Resize(Zone* zone); 43}; 44 45// Various default cache types. 46typedef NodeCache<int64_t> Int64NodeCache; 47typedef NodeCache<int32_t> Int32NodeCache; 48typedef NodeCache<void*> PtrNodeCache; 49} 50} 51} // namespace v8::internal::compiler 52 53#endif // V8_COMPILER_NODE_CACHE_H_ 54