1 // Copyright 2012 the V8 project authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef V8_REGEXP_REGEXP_MACRO_ASSEMBLER_IRREGEXP_H_ 6 #define V8_REGEXP_REGEXP_MACRO_ASSEMBLER_IRREGEXP_H_ 7 8 #ifdef V8_INTERPRETED_REGEXP 9 10 #include "src/regexp/regexp-macro-assembler.h" 11 12 namespace v8 { 13 namespace internal { 14 15 // A light-weight assembler for the Irregexp byte code. 16 class RegExpMacroAssemblerIrregexp: public RegExpMacroAssembler { 17 public: 18 // Create an assembler. Instructions and relocation information are emitted 19 // into a buffer, with the instructions starting from the beginning and the 20 // relocation information starting from the end of the buffer. See CodeDesc 21 // for a detailed comment on the layout (globals.h). 22 // 23 // If the provided buffer is NULL, the assembler allocates and grows its own 24 // buffer, and buffer_size determines the initial buffer size. The buffer is 25 // owned by the assembler and deallocated upon destruction of the assembler. 26 // 27 // If the provided buffer is not NULL, the assembler uses the provided buffer 28 // for code generation and assumes its size to be buffer_size. If the buffer 29 // is too small, a fatal error occurs. No deallocation of the buffer is done 30 // upon destruction of the assembler. 31 RegExpMacroAssemblerIrregexp(Isolate* isolate, Vector<byte> buffer, 32 Zone* zone); 33 virtual ~RegExpMacroAssemblerIrregexp(); 34 // The byte-code interpreter checks on each push anyway. stack_limit_slack()35 virtual int stack_limit_slack() { return 1; } CanReadUnaligned()36 virtual bool CanReadUnaligned() { return false; } 37 virtual void Bind(Label* label); 38 virtual void AdvanceCurrentPosition(int by); // Signed cp change. 39 virtual void PopCurrentPosition(); 40 virtual void PushCurrentPosition(); 41 virtual void Backtrack(); 42 virtual void GoTo(Label* label); 43 virtual void PushBacktrack(Label* label); 44 virtual bool Succeed(); 45 virtual void Fail(); 46 virtual void PopRegister(int register_index); 47 virtual void PushRegister(int register_index, 48 StackCheckFlag check_stack_limit); 49 virtual void AdvanceRegister(int reg, int by); // r[reg] += by. 50 virtual void SetCurrentPositionFromEnd(int by); 51 virtual void SetRegister(int register_index, int to); 52 virtual void WriteCurrentPositionToRegister(int reg, int cp_offset); 53 virtual void ClearRegisters(int reg_from, int reg_to); 54 virtual void ReadCurrentPositionFromRegister(int reg); 55 virtual void WriteStackPointerToRegister(int reg); 56 virtual void ReadStackPointerFromRegister(int reg); 57 virtual void LoadCurrentCharacter(int cp_offset, 58 Label* on_end_of_input, 59 bool check_bounds = true, 60 int characters = 1); 61 virtual void CheckCharacter(unsigned c, Label* on_equal); 62 virtual void CheckCharacterAfterAnd(unsigned c, 63 unsigned mask, 64 Label* on_equal); 65 virtual void CheckCharacterGT(uc16 limit, Label* on_greater); 66 virtual void CheckCharacterLT(uc16 limit, Label* on_less); 67 virtual void CheckGreedyLoop(Label* on_tos_equals_current_position); 68 virtual void CheckAtStart(Label* on_at_start); 69 virtual void CheckNotAtStart(int cp_offset, Label* on_not_at_start); 70 virtual void CheckNotCharacter(unsigned c, Label* on_not_equal); 71 virtual void CheckNotCharacterAfterAnd(unsigned c, 72 unsigned mask, 73 Label* on_not_equal); 74 virtual void CheckNotCharacterAfterMinusAnd(uc16 c, 75 uc16 minus, 76 uc16 mask, 77 Label* on_not_equal); 78 virtual void CheckCharacterInRange(uc16 from, 79 uc16 to, 80 Label* on_in_range); 81 virtual void CheckCharacterNotInRange(uc16 from, 82 uc16 to, 83 Label* on_not_in_range); 84 virtual void CheckBitInTable(Handle<ByteArray> table, Label* on_bit_set); 85 virtual void CheckNotBackReference(int start_reg, bool read_backward, 86 Label* on_no_match); 87 virtual void CheckNotBackReferenceIgnoreCase(int start_reg, 88 bool read_backward, bool unicode, 89 Label* on_no_match); 90 virtual void IfRegisterLT(int register_index, int comparand, Label* if_lt); 91 virtual void IfRegisterGE(int register_index, int comparand, Label* if_ge); 92 virtual void IfRegisterEqPos(int register_index, Label* if_eq); 93 94 virtual IrregexpImplementation Implementation(); 95 virtual Handle<HeapObject> GetCode(Handle<String> source); 96 97 private: 98 void Expand(); 99 // Code and bitmap emission. 100 inline void EmitOrLink(Label* label); 101 inline void Emit32(uint32_t x); 102 inline void Emit16(uint32_t x); 103 inline void Emit8(uint32_t x); 104 inline void Emit(uint32_t bc, uint32_t arg); 105 // Bytecode buffer. 106 int length(); 107 void Copy(Address a); 108 109 // The buffer into which code and relocation info are generated. 110 Vector<byte> buffer_; 111 // The program counter. 112 int pc_; 113 // True if the assembler owns the buffer, false if buffer is external. 114 bool own_buffer_; 115 Label backtrack_; 116 117 int advance_current_start_; 118 int advance_current_offset_; 119 int advance_current_end_; 120 121 Isolate* isolate_; 122 123 static const int kInvalidPC = -1; 124 125 DISALLOW_IMPLICIT_CONSTRUCTORS(RegExpMacroAssemblerIrregexp); 126 }; 127 128 } // namespace internal 129 } // namespace v8 130 131 #endif // V8_INTERPRETED_REGEXP 132 133 #endif // V8_REGEXP_REGEXP_MACRO_ASSEMBLER_IRREGEXP_H_ 134