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_IA32_REGEXP_MACRO_ASSEMBLER_IA32_H_ 29 #define V8_IA32_REGEXP_MACRO_ASSEMBLER_IA32_H_ 30 31 #include "ia32/assembler-ia32.h" 32 #include "ia32/assembler-ia32-inl.h" 33 34 namespace v8 { 35 namespace internal { 36 37 #ifdef V8_INTERPRETED_REGEXP 38 class RegExpMacroAssemblerIA32: public RegExpMacroAssembler { 39 public: 40 RegExpMacroAssemblerIA32() { } 41 virtual ~RegExpMacroAssemblerIA32() { } 42 }; 43 44 #else // V8_INTERPRETED_REGEXP 45 class RegExpMacroAssemblerIA32: public NativeRegExpMacroAssembler { 46 public: 47 RegExpMacroAssemblerIA32(Mode mode, int registers_to_save); 48 virtual ~RegExpMacroAssemblerIA32(); 49 virtual int stack_limit_slack(); 50 virtual void AdvanceCurrentPosition(int by); 51 virtual void AdvanceRegister(int reg, int by); 52 virtual void Backtrack(); 53 virtual void Bind(Label* label); 54 virtual void CheckAtStart(Label* on_at_start); 55 virtual void CheckCharacter(uint32_t c, Label* on_equal); 56 virtual void CheckCharacterAfterAnd(uint32_t c, 57 uint32_t mask, 58 Label* on_equal); 59 virtual void CheckCharacterGT(uc16 limit, Label* on_greater); 60 virtual void CheckCharacterLT(uc16 limit, Label* on_less); 61 virtual void CheckCharacters(Vector<const uc16> str, 62 int cp_offset, 63 Label* on_failure, 64 bool check_end_of_string); 65 // A "greedy loop" is a loop that is both greedy and with a simple 66 // body. It has a particularly simple implementation. 67 virtual void CheckGreedyLoop(Label* on_tos_equals_current_position); 68 virtual void CheckNotAtStart(Label* on_not_at_start); 69 virtual void CheckNotBackReference(int start_reg, Label* on_no_match); 70 virtual void CheckNotBackReferenceIgnoreCase(int start_reg, 71 Label* on_no_match); 72 virtual void CheckNotRegistersEqual(int reg1, int reg2, Label* on_not_equal); 73 virtual void CheckNotCharacter(uint32_t c, Label* on_not_equal); 74 virtual void CheckNotCharacterAfterAnd(uint32_t c, 75 uint32_t mask, 76 Label* on_not_equal); 77 virtual void CheckNotCharacterAfterMinusAnd(uc16 c, 78 uc16 minus, 79 uc16 mask, 80 Label* on_not_equal); 81 // Checks whether the given offset from the current position is before 82 // the end of the string. 83 virtual void CheckPosition(int cp_offset, Label* on_outside_input); 84 virtual bool CheckSpecialCharacterClass(uc16 type, Label* on_no_match); 85 virtual void Fail(); 86 virtual Handle<HeapObject> GetCode(Handle<String> source); 87 virtual void GoTo(Label* label); 88 virtual void IfRegisterGE(int reg, int comparand, Label* if_ge); 89 virtual void IfRegisterLT(int reg, int comparand, Label* if_lt); 90 virtual void IfRegisterEqPos(int reg, Label* if_eq); 91 virtual IrregexpImplementation Implementation(); 92 virtual void LoadCurrentCharacter(int cp_offset, 93 Label* on_end_of_input, 94 bool check_bounds = true, 95 int characters = 1); 96 virtual void PopCurrentPosition(); 97 virtual void PopRegister(int register_index); 98 virtual void PushBacktrack(Label* label); 99 virtual void PushCurrentPosition(); 100 virtual void PushRegister(int register_index, 101 StackCheckFlag check_stack_limit); 102 virtual void ReadCurrentPositionFromRegister(int reg); 103 virtual void ReadStackPointerFromRegister(int reg); 104 virtual void SetCurrentPositionFromEnd(int by); 105 virtual void SetRegister(int register_index, int to); 106 virtual void Succeed(); 107 virtual void WriteCurrentPositionToRegister(int reg, int cp_offset); 108 virtual void ClearRegisters(int reg_from, int reg_to); 109 virtual void WriteStackPointerToRegister(int reg); 110 111 // Called from RegExp if the stack-guard is triggered. 112 // If the code object is relocated, the return address is fixed before 113 // returning. 114 static int CheckStackGuardState(Address* return_address, 115 Code* re_code, 116 Address re_frame); 117 118 private: 119 // Offsets from ebp of function parameters and stored registers. 120 static const int kFramePointer = 0; 121 // Above the frame pointer - function parameters and return address. 122 static const int kReturn_eip = kFramePointer + kPointerSize; 123 static const int kFrameAlign = kReturn_eip + kPointerSize; 124 // Parameters. 125 static const int kInputString = kFrameAlign; 126 static const int kStartIndex = kInputString + kPointerSize; 127 static const int kInputStart = kStartIndex + kPointerSize; 128 static const int kInputEnd = kInputStart + kPointerSize; 129 static const int kRegisterOutput = kInputEnd + kPointerSize; 130 static const int kStackHighEnd = kRegisterOutput + kPointerSize; 131 static const int kDirectCall = kStackHighEnd + kPointerSize; 132 static const int kIsolate = kDirectCall + kPointerSize; 133 // Below the frame pointer - local stack variables. 134 // When adding local variables remember to push space for them in 135 // the frame in GetCode. 136 static const int kBackup_esi = kFramePointer - kPointerSize; 137 static const int kBackup_edi = kBackup_esi - kPointerSize; 138 static const int kBackup_ebx = kBackup_edi - kPointerSize; 139 static const int kInputStartMinusOne = kBackup_ebx - kPointerSize; 140 // First register address. Following registers are below it on the stack. 141 static const int kRegisterZero = kInputStartMinusOne - kPointerSize; 142 143 // Initial size of code buffer. 144 static const size_t kRegExpCodeSize = 1024; 145 146 // Load a number of characters at the given offset from the 147 // current position, into the current-character register. 148 void LoadCurrentCharacterUnchecked(int cp_offset, int character_count); 149 150 // Check whether preemption has been requested. 151 void CheckPreemption(); 152 153 // Check whether we are exceeding the stack limit on the backtrack stack. 154 void CheckStackLimit(); 155 156 // Generate a call to CheckStackGuardState. 157 void CallCheckStackGuardState(Register scratch); 158 159 // The ebp-relative location of a regexp register. 160 Operand register_location(int register_index); 161 162 // The register containing the current character after LoadCurrentCharacter. 163 inline Register current_character() { return edx; } 164 165 // The register containing the backtrack stack top. Provides a meaningful 166 // name to the register. 167 inline Register backtrack_stackpointer() { return ecx; } 168 169 // Byte size of chars in the string to match (decided by the Mode argument) 170 inline int char_size() { return static_cast<int>(mode_); } 171 172 // Equivalent to a conditional branch to the label, unless the label 173 // is NULL, in which case it is a conditional Backtrack. 174 void BranchOrBacktrack(Condition condition, Label* to); 175 176 // Call and return internally in the generated code in a way that 177 // is GC-safe (i.e., doesn't leave absolute code addresses on the stack) 178 inline void SafeCall(Label* to); 179 inline void SafeReturn(); 180 inline void SafeCallTarget(Label* name); 181 182 // Pushes the value of a register on the backtrack stack. Decrements the 183 // stack pointer (ecx) by a word size and stores the register's value there. 184 inline void Push(Register source); 185 186 // Pushes a value on the backtrack stack. Decrements the stack pointer (ecx) 187 // by a word size and stores the value there. 188 inline void Push(Immediate value); 189 190 // Pops a value from the backtrack stack. Reads the word at the stack pointer 191 // (ecx) and increments it by a word size. 192 inline void Pop(Register target); 193 194 MacroAssembler* masm_; 195 196 // Which mode to generate code for (ASCII or UC16). 197 Mode mode_; 198 199 // One greater than maximal register index actually used. 200 int num_registers_; 201 202 // Number of registers to output at the end (the saved registers 203 // are always 0..num_saved_registers_-1) 204 int num_saved_registers_; 205 206 // Labels used internally. 207 Label entry_label_; 208 Label start_label_; 209 Label success_label_; 210 Label backtrack_label_; 211 Label exit_label_; 212 Label check_preempt_label_; 213 Label stack_overflow_label_; 214 }; 215 #endif // V8_INTERPRETED_REGEXP 216 217 }} // namespace v8::internal 218 219 #endif // V8_IA32_REGEXP_MACRO_ASSEMBLER_IA32_H_ 220
