CSE2410 Fall 2014 Bounce

// Copyright 2008-2009 the V8 project authors. All rights reserved.

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// modification, are permitted provided that the following conditions are

// met:

//

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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#ifndef V8_REGEXP_MACRO_ASSEMBLER_IRREGEXP_H_

#define V8_REGEXP_MACRO_ASSEMBLER_IRREGEXP_H_

namespace v8 { namespace internal {

class RegExpMacroAssemblerIrregexp: public RegExpMacroAssembler {

 public:

  // 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 NULL, 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 NULL, 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.

  explicit RegExpMacroAssemblerIrregexp(Vector<byte>);

  virtual ~RegExpMacroAssemblerIrregexp();

  // The byte-code interpreter checks on each push anyway.

  virtual int stack_limit_slack() { return 1; }

  virtual void Bind(Label* label);

  virtual void EmitOrLink(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 void 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 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(uint32_t c, Label* on_equal);

  virtual void CheckCharacterAfterAnd(uint32_t c,

                                      uint32_t 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(Label* on_not_at_start);

  virtual void CheckNotCharacter(uint32_t c, Label* on_not_equal);

  virtual void CheckNotCharacterAfterAnd(uint32_t c,

                                         uint32_t mask,

                                         Label* on_not_equal);

  virtual void CheckNotCharacterAfterMinusAnd(uc16 c,

                                              uc16 minus,

                                              uc16 mask,

                                              Label* on_not_equal);

  virtual void CheckNotBackReference(int start_reg, Label* on_no_match);

  virtual void CheckNotBackReferenceIgnoreCase(int start_reg,

                                               Label* on_no_match);

  virtual void CheckNotRegistersEqual(int reg1, int reg2, Label* on_not_equal);

  virtual void CheckCharacters(Vector<const uc16> str,

                               int cp_offset,

                               Label* on_failure,

                               bool check_end_of_string);

  virtual void CheckBitmap(uc16 start, Label* bitmap, Label* on_zero);

  virtual void DispatchHalfNibbleMap(uc16 start,

                                     Label* half_nibble_map,

                                     const Vector<Label*>& destinations);

  virtual void DispatchByteMap(uc16 start,

                               Label* byte_map,

                               const Vector<Label*>& destinations);

  virtual void DispatchHighByteMap(byte start,

                                   Label* byte_map,

                                   const Vector<Label*>& destinations);

  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<Object> GetCode(Handle<String> source);

 private:

  void Expand();

  // Code and bitmap emission.

  inline void Emit32(uint32_t x);

  inline void Emit16(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_;

  static const int kInvalidPC = -1;

  DISALLOW_IMPLICIT_CONSTRUCTORS(RegExpMacroAssemblerIrregexp);

};

} }  // namespace v8::internal

#endif  // V8_REGEXP_MACRO_ASSEMBLER_IRREGEXP_H_