ed833ff5f0
Flatten cons strings into a buffer instead, as we already did for strings larger than 64 anyway. Change-Id: Ida7afb9f7ceb38505d67bedfdfbc43c8b4d8c303 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1599428 Commit-Queue: Toon Verwaest <verwaest@chromium.org> Reviewed-by: Igor Sheludko <ishell@chromium.org> Cr-Commit-Position: refs/heads/master@{#61333}
59 lines
1.7 KiB
C++
59 lines
1.7 KiB
C++
// Copyright 2017 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_STRING_HASHER_H_
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#define V8_STRING_HASHER_H_
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#include "src/globals.h"
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namespace v8 {
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namespace internal {
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template <typename T>
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class Vector;
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class V8_EXPORT_PRIVATE StringHasher final {
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public:
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StringHasher() = delete;
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template <typename schar>
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static inline uint32_t HashSequentialString(const schar* chars, int length,
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uint64_t seed);
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// Calculated hash value for a string consisting of 1 to
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// String::kMaxArrayIndexSize digits with no leading zeros (except "0").
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// value is represented decimal value.
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static uint32_t MakeArrayIndexHash(uint32_t value, int length);
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// No string is allowed to have a hash of zero. That value is reserved
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// for internal properties. If the hash calculation yields zero then we
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// use 27 instead.
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static const int kZeroHash = 27;
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// Reusable parts of the hashing algorithm.
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V8_INLINE static uint32_t AddCharacterCore(uint32_t running_hash, uint16_t c);
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V8_INLINE static uint32_t GetHashCore(uint32_t running_hash);
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static inline uint32_t GetTrivialHash(int length);
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};
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// Useful for std containers that require something ()'able.
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struct SeededStringHasher {
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explicit SeededStringHasher(uint64_t hashseed) : hashseed_(hashseed) {}
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inline std::size_t operator()(const char* name) const;
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uint64_t hashseed_;
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};
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// Useful for std containers that require something ()'able.
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struct StringEquals {
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bool operator()(const char* name1, const char* name2) const {
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return strcmp(name1, name2) == 0;
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}
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};
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} // namespace internal
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} // namespace v8
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#endif // V8_STRING_HASHER_H_
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