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<HeapObject> 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_ 250 251