396 lines
12 KiB
C++
396 lines
12 KiB
C++
// Copyright 2008-2009 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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#include "regexp/regexp-bytecode-generator.h"
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#include "regexp/regexp-bytecode-generator-inl.h"
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#include "regexp/regexp-bytecode-peephole.h"
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#include "regexp/regexp-bytecodes.h"
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#include "regexp/regexp-macro-assembler.h"
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namespace v8 {
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namespace internal {
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RegExpBytecodeGenerator::RegExpBytecodeGenerator(Isolate* isolate, Zone* zone)
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: RegExpMacroAssembler(isolate, zone),
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buffer_(Vector<byte>::New(1024)),
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pc_(0),
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advance_current_end_(kInvalidPC),
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jump_edges_(zone),
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isolate_(isolate) {}
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RegExpBytecodeGenerator::~RegExpBytecodeGenerator() {
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if (backtrack_.is_linked()) backtrack_.Unuse();
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buffer_.Dispose();
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}
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RegExpBytecodeGenerator::IrregexpImplementation
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RegExpBytecodeGenerator::Implementation() {
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return kBytecodeImplementation;
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}
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void RegExpBytecodeGenerator::Bind(Label* l) {
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advance_current_end_ = kInvalidPC;
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DCHECK(!l->is_bound());
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if (l->is_linked()) {
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int pos = l->pos();
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while (pos != 0) {
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int fixup = pos;
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pos = *reinterpret_cast<int32_t*>(buffer_.begin() + fixup);
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*reinterpret_cast<uint32_t*>(buffer_.begin() + fixup) = pc_;
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jump_edges_.emplace(fixup, pc_);
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}
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}
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l->bind_to(pc_);
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}
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void RegExpBytecodeGenerator::EmitOrLink(Label* l) {
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if (l == nullptr) l = &backtrack_;
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int pos = 0;
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if (l->is_bound()) {
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pos = l->pos();
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jump_edges_.emplace(pc_, pos);
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} else {
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if (l->is_linked()) {
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pos = l->pos();
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}
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l->link_to(pc_);
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}
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Emit32(pos);
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}
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void RegExpBytecodeGenerator::PopRegister(int register_index) {
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DCHECK_LE(0, register_index);
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DCHECK_GE(kMaxRegister, register_index);
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Emit(BC_POP_REGISTER, register_index);
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}
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void RegExpBytecodeGenerator::PushRegister(int register_index,
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StackCheckFlag check_stack_limit) {
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DCHECK_LE(0, register_index);
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DCHECK_GE(kMaxRegister, register_index);
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Emit(BC_PUSH_REGISTER, register_index);
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}
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void RegExpBytecodeGenerator::WriteCurrentPositionToRegister(int register_index,
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int cp_offset) {
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DCHECK_LE(0, register_index);
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DCHECK_GE(kMaxRegister, register_index);
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Emit(BC_SET_REGISTER_TO_CP, register_index);
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Emit32(cp_offset); // Current position offset.
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}
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void RegExpBytecodeGenerator::ClearRegisters(int reg_from, int reg_to) {
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DCHECK(reg_from <= reg_to);
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for (int reg = reg_from; reg <= reg_to; reg++) {
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SetRegister(reg, -1);
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}
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}
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void RegExpBytecodeGenerator::ReadCurrentPositionFromRegister(
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int register_index) {
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DCHECK_LE(0, register_index);
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DCHECK_GE(kMaxRegister, register_index);
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Emit(BC_SET_CP_TO_REGISTER, register_index);
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}
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void RegExpBytecodeGenerator::WriteStackPointerToRegister(int register_index) {
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DCHECK_LE(0, register_index);
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DCHECK_GE(kMaxRegister, register_index);
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Emit(BC_SET_REGISTER_TO_SP, register_index);
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}
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void RegExpBytecodeGenerator::ReadStackPointerFromRegister(int register_index) {
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DCHECK_LE(0, register_index);
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DCHECK_GE(kMaxRegister, register_index);
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Emit(BC_SET_SP_TO_REGISTER, register_index);
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}
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void RegExpBytecodeGenerator::SetCurrentPositionFromEnd(int by) {
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DCHECK(is_uint24(by));
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Emit(BC_SET_CURRENT_POSITION_FROM_END, by);
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}
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void RegExpBytecodeGenerator::SetRegister(int register_index, int to) {
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DCHECK_LE(0, register_index);
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DCHECK_GE(kMaxRegister, register_index);
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Emit(BC_SET_REGISTER, register_index);
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Emit32(to);
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}
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void RegExpBytecodeGenerator::AdvanceRegister(int register_index, int by) {
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DCHECK_LE(0, register_index);
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DCHECK_GE(kMaxRegister, register_index);
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Emit(BC_ADVANCE_REGISTER, register_index);
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Emit32(by);
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}
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void RegExpBytecodeGenerator::PopCurrentPosition() { Emit(BC_POP_CP, 0); }
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void RegExpBytecodeGenerator::PushCurrentPosition() { Emit(BC_PUSH_CP, 0); }
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void RegExpBytecodeGenerator::Backtrack() { Emit(BC_POP_BT, 0); }
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void RegExpBytecodeGenerator::GoTo(Label* l) {
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if (advance_current_end_ == pc_) {
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// Combine advance current and goto.
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pc_ = advance_current_start_;
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Emit(BC_ADVANCE_CP_AND_GOTO, advance_current_offset_);
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EmitOrLink(l);
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advance_current_end_ = kInvalidPC;
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} else {
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// Regular goto.
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Emit(BC_GOTO, 0);
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EmitOrLink(l);
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}
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}
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void RegExpBytecodeGenerator::PushBacktrack(Label* l) {
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Emit(BC_PUSH_BT, 0);
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EmitOrLink(l);
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}
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bool RegExpBytecodeGenerator::Succeed() {
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Emit(BC_SUCCEED, 0);
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return false; // Restart matching for global regexp not supported.
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}
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void RegExpBytecodeGenerator::Fail() { Emit(BC_FAIL, 0); }
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void RegExpBytecodeGenerator::AdvanceCurrentPosition(int by) {
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DCHECK_LE(kMinCPOffset, by);
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DCHECK_GE(kMaxCPOffset, by);
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advance_current_start_ = pc_;
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advance_current_offset_ = by;
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Emit(BC_ADVANCE_CP, by);
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advance_current_end_ = pc_;
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}
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void RegExpBytecodeGenerator::CheckGreedyLoop(
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Label* on_tos_equals_current_position) {
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Emit(BC_CHECK_GREEDY, 0);
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EmitOrLink(on_tos_equals_current_position);
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}
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void RegExpBytecodeGenerator::LoadCurrentCharacterImpl(int cp_offset,
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Label* on_failure,
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bool check_bounds,
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int characters,
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int eats_at_least) {
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DCHECK_GE(eats_at_least, characters);
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if (eats_at_least > characters && check_bounds) {
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DCHECK(is_uint24(cp_offset + eats_at_least));
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Emit(BC_CHECK_CURRENT_POSITION, cp_offset + eats_at_least);
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EmitOrLink(on_failure);
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check_bounds = false; // Load below doesn't need to check.
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}
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DCHECK_LE(kMinCPOffset, cp_offset);
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DCHECK_GE(kMaxCPOffset, cp_offset);
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int bytecode;
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if (check_bounds) {
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if (characters == 4) {
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bytecode = BC_LOAD_4_CURRENT_CHARS;
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} else if (characters == 2) {
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bytecode = BC_LOAD_2_CURRENT_CHARS;
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} else {
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DCHECK_EQ(1, characters);
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bytecode = BC_LOAD_CURRENT_CHAR;
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}
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} else {
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if (characters == 4) {
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bytecode = BC_LOAD_4_CURRENT_CHARS_UNCHECKED;
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} else if (characters == 2) {
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bytecode = BC_LOAD_2_CURRENT_CHARS_UNCHECKED;
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} else {
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DCHECK_EQ(1, characters);
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bytecode = BC_LOAD_CURRENT_CHAR_UNCHECKED;
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}
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}
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Emit(bytecode, cp_offset);
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if (check_bounds) EmitOrLink(on_failure);
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}
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void RegExpBytecodeGenerator::CheckCharacterLT(uc16 limit, Label* on_less) {
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Emit(BC_CHECK_LT, limit);
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EmitOrLink(on_less);
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}
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void RegExpBytecodeGenerator::CheckCharacterGT(uc16 limit, Label* on_greater) {
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Emit(BC_CHECK_GT, limit);
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EmitOrLink(on_greater);
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}
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void RegExpBytecodeGenerator::CheckCharacter(uint32_t c, Label* on_equal) {
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if (c > MAX_FIRST_ARG) {
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Emit(BC_CHECK_4_CHARS, 0);
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Emit32(c);
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} else {
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Emit(BC_CHECK_CHAR, c);
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}
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EmitOrLink(on_equal);
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}
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void RegExpBytecodeGenerator::CheckAtStart(int cp_offset, Label* on_at_start) {
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Emit(BC_CHECK_AT_START, cp_offset);
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EmitOrLink(on_at_start);
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}
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void RegExpBytecodeGenerator::CheckNotAtStart(int cp_offset,
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Label* on_not_at_start) {
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Emit(BC_CHECK_NOT_AT_START, cp_offset);
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EmitOrLink(on_not_at_start);
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}
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void RegExpBytecodeGenerator::CheckNotCharacter(uint32_t c,
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Label* on_not_equal) {
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if (c > MAX_FIRST_ARG) {
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Emit(BC_CHECK_NOT_4_CHARS, 0);
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Emit32(c);
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} else {
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Emit(BC_CHECK_NOT_CHAR, c);
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}
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EmitOrLink(on_not_equal);
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}
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void RegExpBytecodeGenerator::CheckCharacterAfterAnd(uint32_t c, uint32_t mask,
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Label* on_equal) {
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if (c > MAX_FIRST_ARG) {
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Emit(BC_AND_CHECK_4_CHARS, 0);
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Emit32(c);
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} else {
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Emit(BC_AND_CHECK_CHAR, c);
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}
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Emit32(mask);
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EmitOrLink(on_equal);
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}
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void RegExpBytecodeGenerator::CheckNotCharacterAfterAnd(uint32_t c,
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uint32_t mask,
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Label* on_not_equal) {
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if (c > MAX_FIRST_ARG) {
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Emit(BC_AND_CHECK_NOT_4_CHARS, 0);
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Emit32(c);
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} else {
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Emit(BC_AND_CHECK_NOT_CHAR, c);
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}
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Emit32(mask);
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EmitOrLink(on_not_equal);
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}
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void RegExpBytecodeGenerator::CheckNotCharacterAfterMinusAnd(
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uc16 c, uc16 minus, uc16 mask, Label* on_not_equal) {
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Emit(BC_MINUS_AND_CHECK_NOT_CHAR, c);
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Emit16(minus);
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Emit16(mask);
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EmitOrLink(on_not_equal);
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}
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void RegExpBytecodeGenerator::CheckCharacterInRange(uc16 from, uc16 to,
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Label* on_in_range) {
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Emit(BC_CHECK_CHAR_IN_RANGE, 0);
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Emit16(from);
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Emit16(to);
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EmitOrLink(on_in_range);
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}
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void RegExpBytecodeGenerator::CheckCharacterNotInRange(uc16 from, uc16 to,
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Label* on_not_in_range) {
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Emit(BC_CHECK_CHAR_NOT_IN_RANGE, 0);
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Emit16(from);
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Emit16(to);
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EmitOrLink(on_not_in_range);
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}
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void RegExpBytecodeGenerator::CheckBitInTable(Handle<ByteArray> table,
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Label* on_bit_set) {
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Emit(BC_CHECK_BIT_IN_TABLE, 0);
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EmitOrLink(on_bit_set);
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for (int i = 0; i < kTableSize; i += kBitsPerByte) {
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int byte = 0;
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for (int j = 0; j < kBitsPerByte; j++) {
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if (table->get(i + j) != 0) byte |= 1 << j;
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}
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Emit8(byte);
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}
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}
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void RegExpBytecodeGenerator::CheckNotBackReference(int start_reg,
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bool read_backward,
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Label* on_not_equal) {
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DCHECK_LE(0, start_reg);
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DCHECK_GE(kMaxRegister, start_reg);
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Emit(read_backward ? BC_CHECK_NOT_BACK_REF_BACKWARD : BC_CHECK_NOT_BACK_REF,
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start_reg);
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EmitOrLink(on_not_equal);
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}
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void RegExpBytecodeGenerator::CheckNotBackReferenceIgnoreCase(
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int start_reg, bool read_backward, Label* on_not_equal) {
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DCHECK_LE(0, start_reg);
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DCHECK_GE(kMaxRegister, start_reg);
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Emit(read_backward ? BC_CHECK_NOT_BACK_REF_NO_CASE_BACKWARD
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: BC_CHECK_NOT_BACK_REF_NO_CASE,
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start_reg);
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EmitOrLink(on_not_equal);
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}
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void RegExpBytecodeGenerator::IfRegisterLT(int register_index, int comparand,
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Label* on_less_than) {
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DCHECK_LE(0, register_index);
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DCHECK_GE(kMaxRegister, register_index);
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Emit(BC_CHECK_REGISTER_LT, register_index);
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Emit32(comparand);
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EmitOrLink(on_less_than);
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}
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void RegExpBytecodeGenerator::IfRegisterGE(int register_index, int comparand,
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Label* on_greater_or_equal) {
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DCHECK_LE(0, register_index);
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DCHECK_GE(kMaxRegister, register_index);
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Emit(BC_CHECK_REGISTER_GE, register_index);
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Emit32(comparand);
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EmitOrLink(on_greater_or_equal);
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}
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void RegExpBytecodeGenerator::IfRegisterEqPos(int register_index,
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Label* on_eq) {
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DCHECK_LE(0, register_index);
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DCHECK_GE(kMaxRegister, register_index);
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Emit(BC_CHECK_REGISTER_EQ_POS, register_index);
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EmitOrLink(on_eq);
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}
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Handle<HeapObject> RegExpBytecodeGenerator::GetCode(Handle<String> source) {
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Bind(&backtrack_);
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Emit(BC_POP_BT, 0);
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Handle<ByteArray> array;
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if (FLAG_regexp_peephole_optimization) {
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array = RegExpBytecodePeepholeOptimization::OptimizeBytecode(
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isolate_, zone(), source, buffer_.begin(), length(), jump_edges_);
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} else {
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array = isolate_->factory()->NewByteArray(length());
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Copy(array->GetDataStartAddress());
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}
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return array;
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}
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int RegExpBytecodeGenerator::length() { return pc_; }
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void RegExpBytecodeGenerator::Copy(byte* a) {
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MemCopy(a, buffer_.begin(), length());
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}
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void RegExpBytecodeGenerator::Expand() {
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Vector<byte> old_buffer = buffer_;
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buffer_ = Vector<byte>::New(old_buffer.length() * 2);
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MemCopy(buffer_.begin(), old_buffer.begin(), old_buffer.length());
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old_buffer.Dispose();
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}
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} // namespace internal
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} // namespace v8
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