120 lines
5.1 KiB
C++
120 lines
5.1 KiB
C++
// Copyright 2012 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_REGEXP_REGEXP_BYTECODE_GENERATOR_H_
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#define V8_REGEXP_REGEXP_BYTECODE_GENERATOR_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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// An assembler/generator for the Irregexp byte code.
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class V8_EXPORT_PRIVATE RegExpBytecodeGenerator : public RegExpMacroAssembler {
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public:
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// Create an assembler. Instructions and relocation information are emitted
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// into a buffer, with the instructions starting from the beginning and the
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// relocation information starting from the end of the buffer. See CodeDesc
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// for a detailed comment on the layout (globals.h).
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//
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// The assembler allocates and grows its own buffer, and buffer_size
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// determines the initial buffer size. The buffer is owned by the assembler
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// and deallocated upon destruction of the assembler.
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RegExpBytecodeGenerator(Isolate* isolate, Zone* zone);
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virtual ~RegExpBytecodeGenerator();
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// The byte-code interpreter checks on each push anyway.
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virtual int stack_limit_slack() { return 1; }
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virtual bool CanReadUnaligned() { return false; }
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virtual void Bind(Label* label);
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virtual void AdvanceCurrentPosition(int by); // Signed cp change.
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virtual void PopCurrentPosition();
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virtual void PushCurrentPosition();
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virtual void Backtrack();
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virtual void GoTo(Label* label);
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virtual void PushBacktrack(Label* label);
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virtual bool Succeed();
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virtual void Fail();
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virtual void PopRegister(int register_index);
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virtual void PushRegister(int register_index,
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StackCheckFlag check_stack_limit);
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virtual void AdvanceRegister(int reg, int by); // r[reg] += by.
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virtual void SetCurrentPositionFromEnd(int by);
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virtual void SetRegister(int register_index, int to);
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virtual void WriteCurrentPositionToRegister(int reg, int cp_offset);
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virtual void ClearRegisters(int reg_from, int reg_to);
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virtual void ReadCurrentPositionFromRegister(int reg);
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virtual void WriteStackPointerToRegister(int reg);
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virtual void ReadStackPointerFromRegister(int reg);
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virtual void LoadCurrentCharacterImpl(int cp_offset, Label* on_end_of_input,
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bool check_bounds, int characters,
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int eats_at_least);
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virtual void CheckCharacter(unsigned c, Label* on_equal);
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virtual void CheckCharacterAfterAnd(unsigned c, unsigned mask,
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Label* on_equal);
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virtual void CheckCharacterGT(uc16 limit, Label* on_greater);
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virtual void CheckCharacterLT(uc16 limit, Label* on_less);
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virtual void CheckGreedyLoop(Label* on_tos_equals_current_position);
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virtual void CheckAtStart(int cp_offset, Label* on_at_start);
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virtual void CheckNotAtStart(int cp_offset, Label* on_not_at_start);
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virtual void CheckNotCharacter(unsigned c, Label* on_not_equal);
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virtual void CheckNotCharacterAfterAnd(unsigned c, unsigned mask,
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Label* on_not_equal);
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virtual void CheckNotCharacterAfterMinusAnd(uc16 c, uc16 minus, uc16 mask,
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Label* on_not_equal);
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virtual void CheckCharacterInRange(uc16 from, uc16 to, Label* on_in_range);
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virtual void CheckCharacterNotInRange(uc16 from, uc16 to,
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Label* on_not_in_range);
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virtual void CheckBitInTable(Handle<ByteArray> table, Label* on_bit_set);
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virtual void CheckNotBackReference(int start_reg, bool read_backward,
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Label* on_no_match);
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virtual void CheckNotBackReferenceIgnoreCase(int start_reg,
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bool read_backward,
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Label* on_no_match);
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virtual void IfRegisterLT(int register_index, int comparand, Label* if_lt);
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virtual void IfRegisterGE(int register_index, int comparand, Label* if_ge);
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virtual void IfRegisterEqPos(int register_index, Label* if_eq);
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virtual IrregexpImplementation Implementation();
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virtual Handle<HeapObject> GetCode(Handle<String> source);
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private:
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void Expand();
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// Code and bitmap emission.
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inline void EmitOrLink(Label* label);
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inline void Emit32(uint32_t x);
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inline void Emit16(uint32_t x);
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inline void Emit8(uint32_t x);
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inline void Emit(uint32_t bc, uint32_t arg);
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// Bytecode buffer.
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int length();
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void Copy(byte* a);
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// The buffer into which code and relocation info are generated.
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Vector<byte> buffer_;
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// The program counter.
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int pc_;
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Label backtrack_;
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int advance_current_start_;
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int advance_current_offset_;
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int advance_current_end_;
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// Stores jump edges emitted for the bytecode (used by
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// RegExpBytecodePeepholeOptimization).
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// Key: jump source (offset in buffer_ where jump destination is stored).
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// Value: jump destination (offset in buffer_ to jump to).
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ZoneUnorderedMap<int, int> jump_edges_;
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Isolate* isolate_;
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static const int kInvalidPC = -1;
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DISALLOW_IMPLICIT_CONSTRUCTORS(RegExpBytecodeGenerator);
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};
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} // namespace internal
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} // namespace v8
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#endif // V8_REGEXP_REGEXP_BYTECODE_GENERATOR_H_
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