diff options
Diffstat (limited to 'js/src/irregexp/imported/regexp-bytecode-generator.cc')
| -rw-r--r-- | js/src/irregexp/imported/regexp-bytecode-generator.cc | 405 |
1 files changed, 405 insertions, 0 deletions
diff --git a/js/src/irregexp/imported/regexp-bytecode-generator.cc b/js/src/irregexp/imported/regexp-bytecode-generator.cc new file mode 100644 index 0000000000..934a39130d --- /dev/null +++ b/js/src/irregexp/imported/regexp-bytecode-generator.cc @@ -0,0 +1,405 @@ +// Copyright 2008-2009 the V8 project authors. All rights reserved. +// Use of this source code is governed by a BSD-style license that can be +// found in the LICENSE file. + +#include "irregexp/imported/regexp-bytecode-generator.h" + +#include "irregexp/imported/regexp-bytecode-generator-inl.h" +#include "irregexp/imported/regexp-bytecode-peephole.h" +#include "irregexp/imported/regexp-bytecodes.h" +#include "irregexp/imported/regexp-macro-assembler.h" + +namespace v8 { +namespace internal { + +RegExpBytecodeGenerator::RegExpBytecodeGenerator(Isolate* isolate, Zone* zone) + : RegExpMacroAssembler(isolate, zone), + buffer_(kInitialBufferSize, zone), + pc_(0), + advance_current_end_(kInvalidPC), + jump_edges_(zone), + isolate_(isolate) {} + +RegExpBytecodeGenerator::~RegExpBytecodeGenerator() { + if (backtrack_.is_linked()) backtrack_.Unuse(); +} + +RegExpBytecodeGenerator::IrregexpImplementation +RegExpBytecodeGenerator::Implementation() { + return kBytecodeImplementation; +} + +void RegExpBytecodeGenerator::Bind(Label* l) { + advance_current_end_ = kInvalidPC; + DCHECK(!l->is_bound()); + if (l->is_linked()) { + int pos = l->pos(); + while (pos != 0) { + int fixup = pos; + pos = *reinterpret_cast<int32_t*>(buffer_.data() + fixup); + *reinterpret_cast<uint32_t*>(buffer_.data() + fixup) = pc_; + jump_edges_.emplace(fixup, pc_); + } + } + l->bind_to(pc_); +} + +void RegExpBytecodeGenerator::EmitOrLink(Label* l) { + if (l == nullptr) l = &backtrack_; + int pos = 0; + if (l->is_bound()) { + pos = l->pos(); + jump_edges_.emplace(pc_, pos); + } else { + if (l->is_linked()) { + pos = l->pos(); + } + l->link_to(pc_); + } + Emit32(pos); +} + +void RegExpBytecodeGenerator::PopRegister(int register_index) { + DCHECK_LE(0, register_index); + DCHECK_GE(kMaxRegister, register_index); + Emit(BC_POP_REGISTER, register_index); +} + +void RegExpBytecodeGenerator::PushRegister(int register_index, + StackCheckFlag check_stack_limit) { + DCHECK_LE(0, register_index); + DCHECK_GE(kMaxRegister, register_index); + Emit(BC_PUSH_REGISTER, register_index); +} + +void RegExpBytecodeGenerator::WriteCurrentPositionToRegister(int register_index, + int cp_offset) { + DCHECK_LE(0, register_index); + DCHECK_GE(kMaxRegister, register_index); + Emit(BC_SET_REGISTER_TO_CP, register_index); + Emit32(cp_offset); // Current position offset. +} + +void RegExpBytecodeGenerator::ClearRegisters(int reg_from, int reg_to) { + DCHECK(reg_from <= reg_to); + for (int reg = reg_from; reg <= reg_to; reg++) { + SetRegister(reg, -1); + } +} + +void RegExpBytecodeGenerator::ReadCurrentPositionFromRegister( + int register_index) { + DCHECK_LE(0, register_index); + DCHECK_GE(kMaxRegister, register_index); + Emit(BC_SET_CP_TO_REGISTER, register_index); +} + +void RegExpBytecodeGenerator::WriteStackPointerToRegister(int register_index) { + DCHECK_LE(0, register_index); + DCHECK_GE(kMaxRegister, register_index); + Emit(BC_SET_REGISTER_TO_SP, register_index); +} + +void RegExpBytecodeGenerator::ReadStackPointerFromRegister(int register_index) { + DCHECK_LE(0, register_index); + DCHECK_GE(kMaxRegister, register_index); + Emit(BC_SET_SP_TO_REGISTER, register_index); +} + +void RegExpBytecodeGenerator::SetCurrentPositionFromEnd(int by) { + DCHECK(is_uint24(by)); + Emit(BC_SET_CURRENT_POSITION_FROM_END, by); +} + +void RegExpBytecodeGenerator::SetRegister(int register_index, int to) { + DCHECK_LE(0, register_index); + DCHECK_GE(kMaxRegister, register_index); + Emit(BC_SET_REGISTER, register_index); + Emit32(to); +} + +void RegExpBytecodeGenerator::AdvanceRegister(int register_index, int by) { + DCHECK_LE(0, register_index); + DCHECK_GE(kMaxRegister, register_index); + Emit(BC_ADVANCE_REGISTER, register_index); + Emit32(by); +} + +void RegExpBytecodeGenerator::PopCurrentPosition() { Emit(BC_POP_CP, 0); } + +void RegExpBytecodeGenerator::PushCurrentPosition() { Emit(BC_PUSH_CP, 0); } + +void RegExpBytecodeGenerator::Backtrack() { + int error_code = + can_fallback() ? RegExp::RE_FALLBACK_TO_EXPERIMENTAL : RegExp::RE_FAILURE; + Emit(BC_POP_BT, error_code); +} + +void RegExpBytecodeGenerator::GoTo(Label* l) { + if (advance_current_end_ == pc_) { + // Combine advance current and goto. + pc_ = advance_current_start_; + Emit(BC_ADVANCE_CP_AND_GOTO, advance_current_offset_); + EmitOrLink(l); + advance_current_end_ = kInvalidPC; + } else { + // Regular goto. + Emit(BC_GOTO, 0); + EmitOrLink(l); + } +} + +void RegExpBytecodeGenerator::PushBacktrack(Label* l) { + Emit(BC_PUSH_BT, 0); + EmitOrLink(l); +} + +bool RegExpBytecodeGenerator::Succeed() { + Emit(BC_SUCCEED, 0); + return false; // Restart matching for global regexp not supported. +} + +void RegExpBytecodeGenerator::Fail() { Emit(BC_FAIL, 0); } + +void RegExpBytecodeGenerator::AdvanceCurrentPosition(int by) { + // TODO(chromium:1166138): Turn back into DCHECKs once the underlying issue + // is fixed. + CHECK_LE(kMinCPOffset, by); + CHECK_GE(kMaxCPOffset, by); + advance_current_start_ = pc_; + advance_current_offset_ = by; + Emit(BC_ADVANCE_CP, by); + advance_current_end_ = pc_; +} + +void RegExpBytecodeGenerator::CheckGreedyLoop( + Label* on_tos_equals_current_position) { + Emit(BC_CHECK_GREEDY, 0); + EmitOrLink(on_tos_equals_current_position); +} + +void RegExpBytecodeGenerator::LoadCurrentCharacterImpl(int cp_offset, + Label* on_failure, + bool check_bounds, + int characters, + int eats_at_least) { + DCHECK_GE(eats_at_least, characters); + if (eats_at_least > characters && check_bounds) { + DCHECK(is_int24(cp_offset + eats_at_least)); + Emit(BC_CHECK_CURRENT_POSITION, cp_offset + eats_at_least); + EmitOrLink(on_failure); + check_bounds = false; // Load below doesn't need to check. + } + + DCHECK_LE(kMinCPOffset, cp_offset); + DCHECK_GE(kMaxCPOffset, cp_offset); + int bytecode; + if (check_bounds) { + if (characters == 4) { + bytecode = BC_LOAD_4_CURRENT_CHARS; + } else if (characters == 2) { + bytecode = BC_LOAD_2_CURRENT_CHARS; + } else { + DCHECK_EQ(1, characters); + bytecode = BC_LOAD_CURRENT_CHAR; + } + } else { + if (characters == 4) { + bytecode = BC_LOAD_4_CURRENT_CHARS_UNCHECKED; + } else if (characters == 2) { + bytecode = BC_LOAD_2_CURRENT_CHARS_UNCHECKED; + } else { + DCHECK_EQ(1, characters); + bytecode = BC_LOAD_CURRENT_CHAR_UNCHECKED; + } + } + Emit(bytecode, cp_offset); + if (check_bounds) EmitOrLink(on_failure); +} + +void RegExpBytecodeGenerator::CheckCharacterLT(base::uc16 limit, + Label* on_less) { + Emit(BC_CHECK_LT, limit); + EmitOrLink(on_less); +} + +void RegExpBytecodeGenerator::CheckCharacterGT(base::uc16 limit, + Label* on_greater) { + Emit(BC_CHECK_GT, limit); + EmitOrLink(on_greater); +} + +void RegExpBytecodeGenerator::CheckCharacter(uint32_t c, Label* on_equal) { + if (c > MAX_FIRST_ARG) { + Emit(BC_CHECK_4_CHARS, 0); + Emit32(c); + } else { + Emit(BC_CHECK_CHAR, c); + } + EmitOrLink(on_equal); +} + +void RegExpBytecodeGenerator::CheckAtStart(int cp_offset, Label* on_at_start) { + Emit(BC_CHECK_AT_START, cp_offset); + EmitOrLink(on_at_start); +} + +void RegExpBytecodeGenerator::CheckNotAtStart(int cp_offset, + Label* on_not_at_start) { + Emit(BC_CHECK_NOT_AT_START, cp_offset); + EmitOrLink(on_not_at_start); +} + +void RegExpBytecodeGenerator::CheckNotCharacter(uint32_t c, + Label* on_not_equal) { + if (c > MAX_FIRST_ARG) { + Emit(BC_CHECK_NOT_4_CHARS, 0); + Emit32(c); + } else { + Emit(BC_CHECK_NOT_CHAR, c); + } + EmitOrLink(on_not_equal); +} + +void RegExpBytecodeGenerator::CheckCharacterAfterAnd(uint32_t c, uint32_t mask, + Label* on_equal) { + if (c > MAX_FIRST_ARG) { + Emit(BC_AND_CHECK_4_CHARS, 0); + Emit32(c); + } else { + Emit(BC_AND_CHECK_CHAR, c); + } + Emit32(mask); + EmitOrLink(on_equal); +} + +void RegExpBytecodeGenerator::CheckNotCharacterAfterAnd(uint32_t c, + uint32_t mask, + Label* on_not_equal) { + if (c > MAX_FIRST_ARG) { + Emit(BC_AND_CHECK_NOT_4_CHARS, 0); + Emit32(c); + } else { + Emit(BC_AND_CHECK_NOT_CHAR, c); + } + Emit32(mask); + EmitOrLink(on_not_equal); +} + +void RegExpBytecodeGenerator::CheckNotCharacterAfterMinusAnd( + base::uc16 c, base::uc16 minus, base::uc16 mask, Label* on_not_equal) { + Emit(BC_MINUS_AND_CHECK_NOT_CHAR, c); + Emit16(minus); + Emit16(mask); + EmitOrLink(on_not_equal); +} + +void RegExpBytecodeGenerator::CheckCharacterInRange(base::uc16 from, + base::uc16 to, + Label* on_in_range) { + Emit(BC_CHECK_CHAR_IN_RANGE, 0); + Emit16(from); + Emit16(to); + EmitOrLink(on_in_range); +} + +void RegExpBytecodeGenerator::CheckCharacterNotInRange(base::uc16 from, + base::uc16 to, + Label* on_not_in_range) { + Emit(BC_CHECK_CHAR_NOT_IN_RANGE, 0); + Emit16(from); + Emit16(to); + EmitOrLink(on_not_in_range); +} + +void RegExpBytecodeGenerator::CheckBitInTable(Handle<ByteArray> table, + Label* on_bit_set) { + Emit(BC_CHECK_BIT_IN_TABLE, 0); + EmitOrLink(on_bit_set); + for (int i = 0; i < kTableSize; i += kBitsPerByte) { + int byte = 0; + for (int j = 0; j < kBitsPerByte; j++) { + if (table->get(i + j) != 0) byte |= 1 << j; + } + Emit8(byte); + } +} + +void RegExpBytecodeGenerator::CheckNotBackReference(int start_reg, + bool read_backward, + Label* on_not_equal) { + DCHECK_LE(0, start_reg); + DCHECK_GE(kMaxRegister, start_reg); + Emit(read_backward ? BC_CHECK_NOT_BACK_REF_BACKWARD : BC_CHECK_NOT_BACK_REF, + start_reg); + EmitOrLink(on_not_equal); +} + +void RegExpBytecodeGenerator::CheckNotBackReferenceIgnoreCase( + int start_reg, bool read_backward, bool unicode, Label* on_not_equal) { + DCHECK_LE(0, start_reg); + DCHECK_GE(kMaxRegister, start_reg); + Emit(read_backward ? (unicode ? BC_CHECK_NOT_BACK_REF_NO_CASE_UNICODE_BACKWARD + : BC_CHECK_NOT_BACK_REF_NO_CASE_BACKWARD) + : (unicode ? BC_CHECK_NOT_BACK_REF_NO_CASE_UNICODE + : BC_CHECK_NOT_BACK_REF_NO_CASE), + start_reg); + EmitOrLink(on_not_equal); +} + +void RegExpBytecodeGenerator::IfRegisterLT(int register_index, int comparand, + Label* on_less_than) { + DCHECK_LE(0, register_index); + DCHECK_GE(kMaxRegister, register_index); + Emit(BC_CHECK_REGISTER_LT, register_index); + Emit32(comparand); + EmitOrLink(on_less_than); +} + +void RegExpBytecodeGenerator::IfRegisterGE(int register_index, int comparand, + Label* on_greater_or_equal) { + DCHECK_LE(0, register_index); + DCHECK_GE(kMaxRegister, register_index); + Emit(BC_CHECK_REGISTER_GE, register_index); + Emit32(comparand); + EmitOrLink(on_greater_or_equal); +} + +void RegExpBytecodeGenerator::IfRegisterEqPos(int register_index, + Label* on_eq) { + DCHECK_LE(0, register_index); + DCHECK_GE(kMaxRegister, register_index); + Emit(BC_CHECK_REGISTER_EQ_POS, register_index); + EmitOrLink(on_eq); +} + +Handle<HeapObject> RegExpBytecodeGenerator::GetCode(Handle<String> source) { + Bind(&backtrack_); + Backtrack(); + + Handle<ByteArray> array; + if (v8_flags.regexp_peephole_optimization) { + array = RegExpBytecodePeepholeOptimization::OptimizeBytecode( + isolate_, zone(), source, buffer_.data(), length(), jump_edges_); + } else { + array = isolate_->factory()->NewByteArray(length()); + Copy(array->GetDataStartAddress()); + } + + return array; +} + +int RegExpBytecodeGenerator::length() { return pc_; } + +void RegExpBytecodeGenerator::Copy(byte* a) { + MemCopy(a, buffer_.data(), length()); +} + +void RegExpBytecodeGenerator::ExpandBuffer() { + // TODO(jgruber): The growth strategy could be smarter for large sizes. + // TODO(jgruber): It's not necessary to default-initialize new elements. + buffer_.resize(buffer_.size() * 2); +} + +} // namespace internal +} // namespace v8 |