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| 1 // Copyright 2006-2010 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 |
| 29 #ifndef V8_MIPS_REGEXP_MACRO_ASSEMBLER_MIPS_H_ |
| 30 #define V8_MIPS_REGEXP_MACRO_ASSEMBLER_MIPS_H_ |
| 31 |
| 32 namespace v8 { |
| 33 namespace internal { |
| 34 |
| 35 #ifdef V8_INTERPRETED_REGEXP |
| 36 class RegExpMacroAssemblerMIPS: public RegExpMacroAssembler { |
| 37 public: |
| 38 RegExpMacroAssemblerMIPS(); |
| 39 virtual ~RegExpMacroAssemblerMIPS(); |
| 40 }; |
| 41 #else // V8_INTERPRETED_REGEXP |
| 42 class RegExpMacroAssemblerMIPS: public NativeRegExpMacroAssembler { |
| 43 public: |
| 44 RegExpMacroAssemblerMIPS(Mode mode, int registers_to_save); |
| 45 virtual ~RegExpMacroAssemblerMIPS(); |
| 46 virtual int stack_limit_slack(); |
| 47 virtual void AdvanceCurrentPosition(int by); |
| 48 virtual void AdvanceRegister(int reg, int by); |
| 49 virtual void Backtrack(); |
| 50 virtual void Bind(Label* label); |
| 51 virtual void CheckAtStart(Label* on_at_start); |
| 52 virtual void CheckCharacter(uint32_t c, Label* on_equal); |
| 53 virtual void CheckCharacterAfterAnd(uint32_t c, |
| 54 uint32_t mask, |
| 55 Label* on_equal); |
| 56 virtual void CheckCharacterGT(uc16 limit, Label* on_greater); |
| 57 virtual void CheckCharacterLT(uc16 limit, Label* on_less); |
| 58 virtual void CheckCharacters(Vector<const uc16> str, |
| 59 int cp_offset, |
| 60 Label* on_failure, |
| 61 bool check_end_of_string); |
| 62 // A "greedy loop" is a loop that is both greedy and with a simple |
| 63 // body. It has a particularly simple implementation. |
| 64 virtual void CheckGreedyLoop(Label* on_tos_equals_current_position); |
| 65 virtual void CheckNotAtStart(Label* on_not_at_start); |
| 66 virtual void CheckNotBackReference(int start_reg, Label* on_no_match); |
| 67 virtual void CheckNotBackReferenceIgnoreCase(int start_reg, |
| 68 Label* on_no_match); |
| 69 virtual void CheckNotRegistersEqual(int reg1, int reg2, Label* on_not_equal); |
| 70 virtual void CheckNotCharacter(uint32_t c, Label* on_not_equal); |
| 71 virtual void CheckNotCharacterAfterAnd(uint32_t c, |
| 72 uint32_t mask, |
| 73 Label* on_not_equal); |
| 74 virtual void CheckNotCharacterAfterMinusAnd(uc16 c, |
| 75 uc16 minus, |
| 76 uc16 mask, |
| 77 Label* on_not_equal); |
| 78 // Checks whether the given offset from the current position is before |
| 79 // the end of the string. |
| 80 virtual void CheckPosition(int cp_offset, Label* on_outside_input); |
| 81 virtual bool CheckSpecialCharacterClass(uc16 type, |
| 82 Label* on_no_match); |
| 83 virtual void Fail(); |
| 84 virtual Handle<Object> GetCode(Handle<String> source); |
| 85 virtual void GoTo(Label* label); |
| 86 virtual void IfRegisterGE(int reg, int comparand, Label* if_ge); |
| 87 virtual void IfRegisterLT(int reg, int comparand, Label* if_lt); |
| 88 virtual void IfRegisterEqPos(int reg, Label* if_eq); |
| 89 virtual IrregexpImplementation Implementation(); |
| 90 virtual void LoadCurrentCharacter(int cp_offset, |
| 91 Label* on_end_of_input, |
| 92 bool check_bounds = true, |
| 93 int characters = 1); |
| 94 virtual void PopCurrentPosition(); |
| 95 virtual void PopRegister(int register_index); |
| 96 virtual void PushBacktrack(Label* label); |
| 97 virtual void PushCurrentPosition(); |
| 98 virtual void PushRegister(int register_index, |
| 99 StackCheckFlag check_stack_limit); |
| 100 virtual void ReadCurrentPositionFromRegister(int reg); |
| 101 virtual void ReadStackPointerFromRegister(int reg); |
| 102 virtual void SetCurrentPositionFromEnd(int by); |
| 103 virtual void SetRegister(int register_index, int to); |
| 104 virtual void Succeed(); |
| 105 virtual void WriteCurrentPositionToRegister(int reg, int cp_offset); |
| 106 virtual void ClearRegisters(int reg_from, int reg_to); |
| 107 virtual void WriteStackPointerToRegister(int reg); |
| 108 |
| 109 // Called from RegExp if the stack-guard is triggered. |
| 110 // If the code object is relocated, the return address is fixed before |
| 111 // returning. |
| 112 static int CheckStackGuardState(Address* return_address, |
| 113 Code* re_code, |
| 114 Address re_frame); |
| 115 private: |
| 116 // Offsets from frame_pointer() of function parameters and stored registers. |
| 117 static const int kFramePointer = 0; |
| 118 |
| 119 // Above the frame pointer - Stored registers and stack passed parameters. |
| 120 // Registers s0 to s7, fp, and ra. |
| 121 static const int kStoredRegisters = kFramePointer; |
| 122 // Return address (stored from link register, read into pc on return). |
| 123 static const int kReturnAddress = kStoredRegisters + 9 * kPointerSize; |
| 124 // Stack frame header. |
| 125 static const int kStackFrameHeader = kReturnAddress + kPointerSize; |
| 126 // Stack parameters placed by caller. |
| 127 static const int kRegisterOutput = kStackFrameHeader + 16; |
| 128 static const int kStackHighEnd = kRegisterOutput + kPointerSize; |
| 129 static const int kDirectCall = kStackHighEnd + kPointerSize; |
| 130 static const int kIsolate = kDirectCall + kPointerSize; |
| 131 |
| 132 // Below the frame pointer. |
| 133 // Register parameters stored by setup code. |
| 134 static const int kInputEnd = kFramePointer - kPointerSize; |
| 135 static const int kInputStart = kInputEnd - kPointerSize; |
| 136 static const int kStartIndex = kInputStart - kPointerSize; |
| 137 static const int kInputString = kStartIndex - kPointerSize; |
| 138 // When adding local variables remember to push space for them in |
| 139 // the frame in GetCode. |
| 140 static const int kInputStartMinusOne = kInputString - kPointerSize; |
| 141 static const int kAtStart = kInputStartMinusOne - kPointerSize; |
| 142 // First register address. Following registers are below it on the stack. |
| 143 static const int kRegisterZero = kAtStart - kPointerSize; |
| 144 |
| 145 // Initial size of code buffer. |
| 146 static const size_t kRegExpCodeSize = 1024; |
| 147 |
| 148 // Load a number of characters at the given offset from the |
| 149 // current position, into the current-character register. |
| 150 void LoadCurrentCharacterUnchecked(int cp_offset, int character_count); |
| 151 |
| 152 // Check whether preemption has been requested. |
| 153 void CheckPreemption(); |
| 154 |
| 155 // Check whether we are exceeding the stack limit on the backtrack stack. |
| 156 void CheckStackLimit(); |
| 157 |
| 158 |
| 159 // Generate a call to CheckStackGuardState. |
| 160 void CallCheckStackGuardState(Register scratch); |
| 161 |
| 162 // The ebp-relative location of a regexp register. |
| 163 MemOperand register_location(int register_index); |
| 164 |
| 165 // Register holding the current input position as negative offset from |
| 166 // the end of the string. |
| 167 inline Register current_input_offset() { return t2; } |
| 168 |
| 169 // The register containing the current character after LoadCurrentCharacter. |
| 170 inline Register current_character() { return t3; } |
| 171 |
| 172 // Register holding address of the end of the input string. |
| 173 inline Register end_of_input_address() { return t6; } |
| 174 |
| 175 // Register holding the frame address. Local variables, parameters and |
| 176 // regexp registers are addressed relative to this. |
| 177 inline Register frame_pointer() { return fp; } |
| 178 |
| 179 // The register containing the backtrack stack top. Provides a meaningful |
| 180 // name to the register. |
| 181 inline Register backtrack_stackpointer() { return t4; } |
| 182 |
| 183 // Register holding pointer to the current code object. |
| 184 inline Register code_pointer() { return t1; } |
| 185 |
| 186 // Byte size of chars in the string to match (decided by the Mode argument) |
| 187 inline int char_size() { return static_cast<int>(mode_); } |
| 188 |
| 189 // Equivalent to a conditional branch to the label, unless the label |
| 190 // is NULL, in which case it is a conditional Backtrack. |
| 191 void BranchOrBacktrack(Label* to, |
| 192 Condition condition, |
| 193 Register rs, |
| 194 const Operand& rt); |
| 195 |
| 196 // Call and return internally in the generated code in a way that |
| 197 // is GC-safe (i.e., doesn't leave absolute code addresses on the stack) |
| 198 inline void SafeCall(Label* to, |
| 199 Condition cond, |
| 200 Register rs, |
| 201 const Operand& rt); |
| 202 inline void SafeReturn(); |
| 203 inline void SafeCallTarget(Label* name); |
| 204 |
| 205 // Pushes the value of a register on the backtrack stack. Decrements the |
| 206 // stack pointer by a word size and stores the register's value there. |
| 207 inline void Push(Register source); |
| 208 |
| 209 // Pops a value from the backtrack stack. Reads the word at the stack pointer |
| 210 // and increments it by a word size. |
| 211 inline void Pop(Register target); |
| 212 |
| 213 // Calls a C function and cleans up the frame alignment done by |
| 214 // by FrameAlign. The called function *is* allowed to trigger a garbage |
| 215 // collection, but may not take more than four arguments (no arguments |
| 216 // passed on the stack), and the first argument will be a pointer to the |
| 217 // return address. |
| 218 inline void CallCFunctionUsingStub(ExternalReference function, |
| 219 int num_arguments); |
| 220 |
| 221 |
| 222 MacroAssembler* masm_; |
| 223 |
| 224 // Which mode to generate code for (ASCII or UC16). |
| 225 Mode mode_; |
| 226 |
| 227 // One greater than maximal register index actually used. |
| 228 int num_registers_; |
| 229 |
| 230 // Number of registers to output at the end (the saved registers |
| 231 // are always 0..num_saved_registers_-1) |
| 232 int num_saved_registers_; |
| 233 |
| 234 // Labels used internally. |
| 235 Label entry_label_; |
| 236 Label start_label_; |
| 237 Label success_label_; |
| 238 Label backtrack_label_; |
| 239 Label exit_label_; |
| 240 Label check_preempt_label_; |
| 241 Label stack_overflow_label_; |
| 242 }; |
| 243 |
| 244 #endif // V8_INTERPRETED_REGEXP |
| 245 |
| 246 |
| 247 }} // namespace v8::internal |
| 248 |
| 249 #endif // V8_MIPS_REGEXP_MACRO_ASSEMBLER_MIPS_H_ |
| 250 |
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