3f6e0a4ef9
RIP, handwritten KeyedLoadICStub, handwritten KeyedLoadIC_Megamorphic, and hydrogenized KeyedLoadGeneric! Review-Url: https://codereview.chromium.org/2424433002 Cr-Commit-Position: refs/heads/master@{#40354}
59 lines
1.3 KiB
C++
59 lines
1.3 KiB
C++
// Copyright 2016 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef V8_LOOKUP_CACHE_H_
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#define V8_LOOKUP_CACHE_H_
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#include "src/objects.h"
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namespace v8 {
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namespace internal {
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// Cache for mapping (map, property name) into descriptor index.
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// The cache contains both positive and negative results.
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// Descriptor index equals kNotFound means the property is absent.
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// Cleared at startup and prior to any gc.
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class DescriptorLookupCache {
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public:
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// Lookup descriptor index for (map, name).
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// If absent, kAbsent is returned.
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inline int Lookup(Map* source, Name* name);
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// Update an element in the cache.
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inline void Update(Map* source, Name* name, int result);
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// Clear the cache.
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void Clear();
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static const int kAbsent = -2;
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private:
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DescriptorLookupCache() {
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for (int i = 0; i < kLength; ++i) {
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keys_[i].source = NULL;
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keys_[i].name = NULL;
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results_[i] = kAbsent;
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}
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}
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static inline int Hash(Object* source, Name* name);
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static const int kLength = 64;
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struct Key {
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Map* source;
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Name* name;
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};
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Key keys_[kLength];
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int results_[kLength];
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friend class Isolate;
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DISALLOW_COPY_AND_ASSIGN(DescriptorLookupCache);
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};
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} // namespace internal
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} // namespace v8
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#endif // V8_LOOKUP_CACHE_H_
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