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// Copyright 2012 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 "src/regexp/regexp-macro-assembler.h"
namespace v8 {
namespace internal {
// A light-weight assembler for the Irregexp byte code.
class RegExpMacroAssemblerIrregexp: public RegExpMacroAssembler {
// Create an assembler. Instructions and relocation information are emitted
// into a buffer, with the instructions starting from the beginning and the
// relocation information starting from the end of the buffer. See CodeDesc
// for a detailed comment on the layout (globals.h).
// If the provided buffer is nullptr, the assembler allocates and grows its
// own buffer, and buffer_size determines the initial buffer size. The buffer
// is owned by the assembler and deallocated upon destruction of the
// assembler.
// If the provided buffer is not nullptr, the assembler uses the provided
// buffer for code generation and assumes its size to be buffer_size. If the
// buffer is too small, a fatal error occurs. No deallocation of the buffer is
// done upon destruction of the assembler.
RegExpMacroAssemblerIrregexp(Isolate* isolate, Vector<byte> buffer,
Zone* zone);
virtual ~RegExpMacroAssemblerIrregexp();
// The byte-code interpreter checks on each push anyway.
virtual int stack_limit_slack() { return 1; }
virtual bool CanReadUnaligned() { return false; }
virtual void Bind(Label* label);
virtual void AdvanceCurrentPosition(int by); // Signed cp change.
virtual void PopCurrentPosition();
virtual void PushCurrentPosition();
virtual void Backtrack();
virtual void GoTo(Label* label);
virtual void PushBacktrack(Label* label);
virtual bool Succeed();
virtual void Fail();
virtual void PopRegister(int register_index);
virtual void PushRegister(int register_index,
StackCheckFlag check_stack_limit);
virtual void AdvanceRegister(int reg, int by); // r[reg] += by.
virtual void SetCurrentPositionFromEnd(int by);
virtual void SetRegister(int register_index, int to);
virtual void WriteCurrentPositionToRegister(int reg, int cp_offset);
virtual void ClearRegisters(int reg_from, int reg_to);
virtual void ReadCurrentPositionFromRegister(int reg);
virtual void WriteStackPointerToRegister(int reg);
virtual void ReadStackPointerFromRegister(int reg);
virtual void LoadCurrentCharacter(int cp_offset,
Label* on_end_of_input,
bool check_bounds = true,
int characters = 1);
virtual void CheckCharacter(unsigned c, Label* on_equal);
virtual void CheckCharacterAfterAnd(unsigned c,
unsigned mask,
Label* on_equal);
virtual void CheckCharacterGT(uc16 limit, Label* on_greater);
virtual void CheckCharacterLT(uc16 limit, Label* on_less);
virtual void CheckGreedyLoop(Label* on_tos_equals_current_position);
virtual void CheckAtStart(Label* on_at_start);
virtual void CheckNotAtStart(int cp_offset, Label* on_not_at_start);
virtual void CheckNotCharacter(unsigned c, Label* on_not_equal);
virtual void CheckNotCharacterAfterAnd(unsigned c,
unsigned mask,
Label* on_not_equal);
virtual void CheckNotCharacterAfterMinusAnd(uc16 c,
uc16 minus,
uc16 mask,
Label* on_not_equal);
virtual void CheckCharacterInRange(uc16 from,
uc16 to,
Label* on_in_range);
virtual void CheckCharacterNotInRange(uc16 from,
uc16 to,
Label* on_not_in_range);
virtual void CheckBitInTable(Handle<ByteArray> table, Label* on_bit_set);
virtual void CheckNotBackReference(int start_reg, bool read_backward,
Label* on_no_match);
virtual void CheckNotBackReferenceIgnoreCase(int start_reg,
bool read_backward, bool unicode,
Label* on_no_match);
virtual void IfRegisterLT(int register_index, int comparand, Label* if_lt);
virtual void IfRegisterGE(int register_index, int comparand, Label* if_ge);
virtual void IfRegisterEqPos(int register_index, Label* if_eq);
virtual IrregexpImplementation Implementation();
virtual Handle<HeapObject> GetCode(Handle<String> source);
void Expand();
// Code and bitmap emission.
inline void EmitOrLink(Label* label);
inline void Emit32(uint32_t x);
inline void Emit16(uint32_t x);
inline void Emit8(uint32_t x);
inline void Emit(uint32_t bc, uint32_t arg);
// Bytecode buffer.
int length();
void Copy(Address a);
// The buffer into which code and relocation info are generated.
Vector<byte> buffer_;
// The program counter.
int pc_;
// True if the assembler owns the buffer, false if buffer is external.
bool own_buffer_;
Label backtrack_;
int advance_current_start_;
int advance_current_offset_;
int advance_current_end_;
Isolate* isolate_;
static const int kInvalidPC = -1;
} // namespace internal
} // namespace v8