1 // Copyright 2008-2009 the V8 project authors. All rights reserved. 2 // Redistribution and use in source and binary forms, with or without 3 // modification, are permitted provided that the following conditions are 4 // met: 5 // 6 // * Redistributions of source code must retain the above copyright 7 // notice, this list of conditions and the following disclaimer. 8 // * Redistributions in binary form must reproduce the above 9 // copyright notice, this list of conditions and the following 10 // disclaimer in the documentation and/or other materials provided 11 // with the distribution. 12 // * Neither the name of Google Inc. nor the names of its 13 // contributors may be used to endorse or promote products derived 14 // from this software without specific prior written permission. 15 // 16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 28 #ifndef V8_REGEXP_MACRO_ASSEMBLER_IRREGEXP_H_ 29 #define V8_REGEXP_MACRO_ASSEMBLER_IRREGEXP_H_ 30 31 namespace v8 { 32 namespace internal { 33 34 #ifdef V8_INTERPRETED_REGEXP 35 36 class RegExpMacroAssemblerIrregexp: public RegExpMacroAssembler { 37 public: 38 // Create an assembler. Instructions and relocation information are emitted 39 // into a buffer, with the instructions starting from the beginning and the 40 // relocation information starting from the end of the buffer. See CodeDesc 41 // for a detailed comment on the layout (globals.h). 42 // 43 // If the provided buffer is NULL, the assembler allocates and grows its own 44 // buffer, and buffer_size determines the initial buffer size. The buffer is 45 // owned by the assembler and deallocated upon destruction of the assembler. 46 // 47 // If the provided buffer is not NULL, the assembler uses the provided buffer 48 // for code generation and assumes its size to be buffer_size. If the buffer 49 // is too small, a fatal error occurs. No deallocation of the buffer is done 50 // upon destruction of the assembler. 51 explicit RegExpMacroAssemblerIrregexp(Vector<byte>); 52 virtual ~RegExpMacroAssemblerIrregexp(); 53 // The byte-code interpreter checks on each push anyway. stack_limit_slack()54 virtual int stack_limit_slack() { return 1; } 55 virtual void Bind(Label* label); 56 virtual void AdvanceCurrentPosition(int by); // Signed cp change. 57 virtual void PopCurrentPosition(); 58 virtual void PushCurrentPosition(); 59 virtual void Backtrack(); 60 virtual void GoTo(Label* label); 61 virtual void PushBacktrack(Label* label); 62 virtual void Succeed(); 63 virtual void Fail(); 64 virtual void PopRegister(int register_index); 65 virtual void PushRegister(int register_index, 66 StackCheckFlag check_stack_limit); 67 virtual void AdvanceRegister(int reg, int by); // r[reg] += by. 68 virtual void SetCurrentPositionFromEnd(int by); 69 virtual void SetRegister(int register_index, int to); 70 virtual void WriteCurrentPositionToRegister(int reg, int cp_offset); 71 virtual void ClearRegisters(int reg_from, int reg_to); 72 virtual void ReadCurrentPositionFromRegister(int reg); 73 virtual void WriteStackPointerToRegister(int reg); 74 virtual void ReadStackPointerFromRegister(int reg); 75 virtual void LoadCurrentCharacter(int cp_offset, 76 Label* on_end_of_input, 77 bool check_bounds = true, 78 int characters = 1); 79 virtual void CheckCharacter(unsigned c, Label* on_equal); 80 virtual void CheckCharacterAfterAnd(unsigned c, 81 unsigned mask, 82 Label* on_equal); 83 virtual void CheckCharacterGT(uc16 limit, Label* on_greater); 84 virtual void CheckCharacterLT(uc16 limit, Label* on_less); 85 virtual void CheckGreedyLoop(Label* on_tos_equals_current_position); 86 virtual void CheckAtStart(Label* on_at_start); 87 virtual void CheckNotAtStart(Label* on_not_at_start); 88 virtual void CheckNotCharacter(unsigned c, Label* on_not_equal); 89 virtual void CheckNotCharacterAfterAnd(unsigned c, 90 unsigned mask, 91 Label* on_not_equal); 92 virtual void CheckNotCharacterAfterMinusAnd(uc16 c, 93 uc16 minus, 94 uc16 mask, 95 Label* on_not_equal); 96 virtual void CheckNotBackReference(int start_reg, Label* on_no_match); 97 virtual void CheckNotBackReferenceIgnoreCase(int start_reg, 98 Label* on_no_match); 99 virtual void CheckNotRegistersEqual(int reg1, int reg2, Label* on_not_equal); 100 virtual void CheckCharacters(Vector<const uc16> str, 101 int cp_offset, 102 Label* on_failure, 103 bool check_end_of_string); 104 virtual void IfRegisterLT(int register_index, int comparand, Label* if_lt); 105 virtual void IfRegisterGE(int register_index, int comparand, Label* if_ge); 106 virtual void IfRegisterEqPos(int register_index, Label* if_eq); 107 108 virtual IrregexpImplementation Implementation(); 109 virtual Handle<HeapObject> GetCode(Handle<String> source); 110 111 private: 112 void Expand(); 113 // Code and bitmap emission. 114 inline void EmitOrLink(Label* label); 115 inline void Emit32(uint32_t x); 116 inline void Emit16(uint32_t x); 117 inline void Emit(uint32_t bc, uint32_t arg); 118 // Bytecode buffer. 119 int length(); 120 void Copy(Address a); 121 122 // The buffer into which code and relocation info are generated. 123 Vector<byte> buffer_; 124 // The program counter. 125 int pc_; 126 // True if the assembler owns the buffer, false if buffer is external. 127 bool own_buffer_; 128 Label backtrack_; 129 130 int advance_current_start_; 131 int advance_current_offset_; 132 int advance_current_end_; 133 134 static const int kInvalidPC = -1; 135 136 DISALLOW_IMPLICIT_CONSTRUCTORS(RegExpMacroAssemblerIrregexp); 137 }; 138 139 #endif // V8_INTERPRETED_REGEXP 140 141 } } // namespace v8::internal 142 143 #endif // V8_REGEXP_MACRO_ASSEMBLER_IRREGEXP_H_ 144