26321c072c
I extracted following class member functions to string.cc * String * SeqString * SeqOneByteString * SeqTwoByteString * ConsString * ThinString * SlicedString * ExternalString * FlatStringReader * ConsStringIterator Declaration of all above class are in string.h. This patch makes compile time of objects.cc from 20.6s to 19.2s on Z840 Linux. Bug: v8:7629 Change-Id: If74b868b3a3d9a1df2887f82e2557da43ad221f0 Reviewed-on: https://chromium-review.googlesource.com/c/1446342 Reviewed-by: Marja Hölttä <marja@chromium.org> Reviewed-by: Ben Titzer <titzer@chromium.org> Commit-Queue: Takuto Ikuta <tikuta@chromium.org> Cr-Commit-Position: refs/heads/master@{#59235}
110 lines
2.7 KiB
C++
110 lines
2.7 KiB
C++
// Copyright 2019 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_OBJECTS_STRING_COMPARATOR_H_
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#define V8_OBJECTS_STRING_COMPARATOR_H_
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#include "src/base/logging.h"
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#include "src/globals.h"
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#include "src/objects/string.h"
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#include "src/utils.h"
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namespace v8 {
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namespace internal {
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// Compares the contents of two strings by reading and comparing
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// int-sized blocks of characters.
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template <typename Char>
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static inline bool CompareRawStringContents(const Char* const a,
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const Char* const b, int length) {
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return CompareChars(a, b, length) == 0;
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}
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template <typename Chars1, typename Chars2>
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class RawStringComparator : public AllStatic {
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public:
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static inline bool compare(const Chars1* a, const Chars2* b, int len) {
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DCHECK(sizeof(Chars1) != sizeof(Chars2));
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for (int i = 0; i < len; i++) {
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if (a[i] != b[i]) {
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return false;
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}
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}
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return true;
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}
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};
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template <>
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class RawStringComparator<uint16_t, uint16_t> {
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public:
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static inline bool compare(const uint16_t* a, const uint16_t* b, int len) {
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return CompareRawStringContents(a, b, len);
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}
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};
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template <>
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class RawStringComparator<uint8_t, uint8_t> {
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public:
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static inline bool compare(const uint8_t* a, const uint8_t* b, int len) {
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return CompareRawStringContents(a, b, len);
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}
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};
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class StringComparator {
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class State {
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public:
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State() : is_one_byte_(true), length_(0), buffer8_(nullptr) {}
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void Init(String string);
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inline void VisitOneByteString(const uint8_t* chars, int length) {
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is_one_byte_ = true;
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buffer8_ = chars;
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length_ = length;
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}
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inline void VisitTwoByteString(const uint16_t* chars, int length) {
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is_one_byte_ = false;
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buffer16_ = chars;
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length_ = length;
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}
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void Advance(int consumed);
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ConsStringIterator iter_;
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bool is_one_byte_;
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int length_;
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union {
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const uint8_t* buffer8_;
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const uint16_t* buffer16_;
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};
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private:
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DISALLOW_COPY_AND_ASSIGN(State);
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};
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public:
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inline StringComparator() = default;
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template <typename Chars1, typename Chars2>
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static inline bool Equals(State* state_1, State* state_2, int to_check) {
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const Chars1* a = reinterpret_cast<const Chars1*>(state_1->buffer8_);
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const Chars2* b = reinterpret_cast<const Chars2*>(state_2->buffer8_);
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return RawStringComparator<Chars1, Chars2>::compare(a, b, to_check);
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}
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bool Equals(String string_1, String string_2);
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private:
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State state_1_;
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State state_2_;
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DISALLOW_COPY_AND_ASSIGN(StringComparator);
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};
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} // namespace internal
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} // namespace v8
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#endif // V8_OBJECTS_STRING_COMPARATOR_H_
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