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 nullptr, the assembler allocates and grows its 24 // own buffer, and buffer_size determines the initial buffer size. The buffer 25 // is owned by the assembler and deallocated upon destruction of the 26 // assembler. 27 // 28 // If the provided buffer is not nullptr, the assembler uses the provided 29 // buffer for code generation and assumes its size to be buffer_size. If the 30 // buffer is too small, a fatal error occurs. No deallocation of the buffer is 31 // done upon destruction of the assembler. 32 RegExpMacroAssemblerIrregexp(Isolate* isolate, Vector<byte> buffer, 33 Zone* zone); 34 virtual ~RegExpMacroAssemblerIrregexp(); 35 // The byte-code interpreter checks on each push anyway. 36 virtual int stack_limit_slack() { return 1; } 37 virtual bool CanReadUnaligned() { return false; } 38 virtual void Bind(Label* label); 39 virtual void AdvanceCurrentPosition(int by); // Signed cp change. 40 virtual void PopCurrentPosition(); 41 virtual void PushCurrentPosition(); 42 virtual void Backtrack(); 43 virtual void GoTo(Label* label); 44 virtual void PushBacktrack(Label* label); 45 virtual bool Succeed(); 46 virtual void Fail(); 47 virtual void PopRegister(int register_index); 48 virtual void PushRegister(int register_index, 49 StackCheckFlag check_stack_limit); 50 virtual void AdvanceRegister(int reg, int by); // r[reg] += by. 51 virtual void SetCurrentPositionFromEnd(int by); 52 virtual void SetRegister(int register_index, int to); 53 virtual void WriteCurrentPositionToRegister(int reg, int cp_offset); 54 virtual void ClearRegisters(int reg_from, int reg_to); 55 virtual void ReadCurrentPositionFromRegister(int reg); 56 virtual void WriteStackPointerToRegister(int reg); 57 virtual void ReadStackPointerFromRegister(int reg); 58 virtual void LoadCurrentCharacter(int cp_offset, 59 Label* on_end_of_input, 60 bool check_bounds = true, 61 int characters = 1); 62 virtual void CheckCharacter(unsigned c, Label* on_equal); 63 virtual void CheckCharacterAfterAnd(unsigned c, 64 unsigned mask, 65 Label* on_equal); 66 virtual void CheckCharacterGT(uc16 limit, Label* on_greater); 67 virtual void CheckCharacterLT(uc16 limit, Label* on_less); 68 virtual void CheckGreedyLoop(Label* on_tos_equals_current_position); 69 virtual void CheckAtStart(Label* on_at_start); 70 virtual void CheckNotAtStart(int cp_offset, Label* on_not_at_start); 71 virtual void CheckNotCharacter(unsigned c, Label* on_not_equal); 72 virtual void CheckNotCharacterAfterAnd(unsigned c, 73 unsigned mask, 74 Label* on_not_equal); 75 virtual void CheckNotCharacterAfterMinusAnd(uc16 c, 76 uc16 minus, 77 uc16 mask, 78 Label* on_not_equal); 79 virtual void CheckCharacterInRange(uc16 from, 80 uc16 to, 81 Label* on_in_range); 82 virtual void CheckCharacterNotInRange(uc16 from, 83 uc16 to, 84 Label* on_not_in_range); 85 virtual void CheckBitInTable(Handle<ByteArray> table, Label* on_bit_set); 86 virtual void CheckNotBackReference(int start_reg, bool read_backward, 87 Label* on_no_match); 88 virtual void CheckNotBackReferenceIgnoreCase(int start_reg, 89 bool read_backward, bool unicode, 90 Label* on_no_match); 91 virtual void IfRegisterLT(int register_index, int comparand, Label* if_lt); 92 virtual void IfRegisterGE(int register_index, int comparand, Label* if_ge); 93 virtual void IfRegisterEqPos(int register_index, Label* if_eq); 94 95 virtual IrregexpImplementation Implementation(); 96 virtual Handle<HeapObject> GetCode(Handle<String> source); 97 98 private: 99 void Expand(); 100 // Code and bitmap emission. 101 inline void EmitOrLink(Label* label); 102 inline void Emit32(uint32_t x); 103 inline void Emit16(uint32_t x); 104 inline void Emit8(uint32_t x); 105 inline void Emit(uint32_t bc, uint32_t arg); 106 // Bytecode buffer. 107 int length(); 108 void Copy(byte* a); 109 110 // The buffer into which code and relocation info are generated. 111 Vector<byte> buffer_; 112 // The program counter. 113 int pc_; 114 // True if the assembler owns the buffer, false if buffer is external. 115 bool own_buffer_; 116 Label backtrack_; 117 118 int advance_current_start_; 119 int advance_current_offset_; 120 int advance_current_end_; 121 122 Isolate* isolate_; 123 124 static const int kInvalidPC = -1; 125 126 DISALLOW_IMPLICIT_CONSTRUCTORS(RegExpMacroAssemblerIrregexp); 127 }; 128 129 } // namespace internal 130 } // namespace v8 131 132 #endif // V8_INTERPRETED_REGEXP 133 134 #endif // V8_REGEXP_REGEXP_MACRO_ASSEMBLER_IRREGEXP_H_ 135
