1 // Copyright 2011 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 #include "mips/assembler-mips.h" 33 #include "mips/assembler-mips-inl.h" 34 #include "macro-assembler.h" 35 #include "code.h" 36 #include "mips/macro-assembler-mips.h" 37 38 namespace v8 { 39 namespace internal { 40 41 #ifndef V8_INTERPRETED_REGEXP 42 class RegExpMacroAssemblerMIPS: public NativeRegExpMacroAssembler { 43 public: 44 RegExpMacroAssemblerMIPS(Mode mode, int registers_to_save, Zone* zone); 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 // A "greedy loop" is a loop that is both greedy and with a simple 59 // body. It has a particularly simple implementation. 60 virtual void CheckGreedyLoop(Label* on_tos_equals_current_position); 61 virtual void CheckNotAtStart(Label* on_not_at_start); 62 virtual void CheckNotBackReference(int start_reg, Label* on_no_match); 63 virtual void CheckNotBackReferenceIgnoreCase(int start_reg, 64 Label* on_no_match); 65 virtual void CheckNotCharacter(uint32_t c, Label* on_not_equal); 66 virtual void CheckNotCharacterAfterAnd(uint32_t c, 67 uint32_t mask, 68 Label* on_not_equal); 69 virtual void CheckNotCharacterAfterMinusAnd(uc16 c, 70 uc16 minus, 71 uc16 mask, 72 Label* on_not_equal); 73 virtual void CheckCharacterInRange(uc16 from, 74 uc16 to, 75 Label* on_in_range); 76 virtual void CheckCharacterNotInRange(uc16 from, 77 uc16 to, 78 Label* on_not_in_range); 79 virtual void CheckBitInTable(Handle<ByteArray> table, Label* on_bit_set); 80 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, 85 Label* on_no_match); 86 virtual void Fail(); 87 virtual Handle<HeapObject> GetCode(Handle<String> source); 88 virtual void GoTo(Label* label); 89 virtual void IfRegisterGE(int reg, int comparand, Label* if_ge); 90 virtual void IfRegisterLT(int reg, int comparand, Label* if_lt); 91 virtual void IfRegisterEqPos(int reg, Label* if_eq); 92 virtual IrregexpImplementation Implementation(); 93 virtual void LoadCurrentCharacter(int cp_offset, 94 Label* on_end_of_input, 95 bool check_bounds = true, 96 int characters = 1); 97 virtual void PopCurrentPosition(); 98 virtual void PopRegister(int register_index); 99 virtual void PushBacktrack(Label* label); 100 virtual void PushCurrentPosition(); 101 virtual void PushRegister(int register_index, 102 StackCheckFlag check_stack_limit); 103 virtual void ReadCurrentPositionFromRegister(int reg); 104 virtual void ReadStackPointerFromRegister(int reg); 105 virtual void SetCurrentPositionFromEnd(int by); 106 virtual void SetRegister(int register_index, int to); 107 virtual bool Succeed(); 108 virtual void WriteCurrentPositionToRegister(int reg, int cp_offset); 109 virtual void ClearRegisters(int reg_from, int reg_to); 110 virtual void WriteStackPointerToRegister(int reg); 111 virtual bool CanReadUnaligned(); 112 113 // Called from RegExp if the stack-guard is triggered. 114 // If the code object is relocated, the return address is fixed before 115 // returning. 116 static int CheckStackGuardState(Address* return_address, 117 Code* re_code, 118 Address re_frame); 119 120 private: 121 // Offsets from frame_pointer() of function parameters and stored registers. 122 static const int kFramePointer = 0; 123 124 // Above the frame pointer - Stored registers and stack passed parameters. 125 // Registers s0 to s7, fp, and ra. 126 static const int kStoredRegisters = kFramePointer; 127 // Return address (stored from link register, read into pc on return). 128 static const int kReturnAddress = kStoredRegisters + 9 * kPointerSize; 129 static const int kSecondaryReturnAddress = kReturnAddress + kPointerSize; 130 // Stack frame header. 131 static const int kStackFrameHeader = kReturnAddress + kPointerSize; 132 // Stack parameters placed by caller. 133 static const int kRegisterOutput = kStackFrameHeader + 20; 134 static const int kNumOutputRegisters = kRegisterOutput + kPointerSize; 135 static const int kStackHighEnd = kNumOutputRegisters + kPointerSize; 136 static const int kDirectCall = kStackHighEnd + kPointerSize; 137 static const int kIsolate = kDirectCall + kPointerSize; 138 139 // Below the frame pointer. 140 // Register parameters stored by setup code. 141 static const int kInputEnd = kFramePointer - kPointerSize; 142 static const int kInputStart = kInputEnd - kPointerSize; 143 static const int kStartIndex = kInputStart - kPointerSize; 144 static const int kInputString = kStartIndex - kPointerSize; 145 // When adding local variables remember to push space for them in 146 // the frame in GetCode. 147 static const int kSuccessfulCaptures = kInputString - kPointerSize; 148 static const int kInputStartMinusOne = kSuccessfulCaptures - kPointerSize; 149 // First register address. Following registers are below it on the stack. 150 static const int kRegisterZero = kInputStartMinusOne - kPointerSize; 151 152 // Initial size of code buffer. 153 static const size_t kRegExpCodeSize = 1024; 154 155 // Load a number of characters at the given offset from the 156 // current position, into the current-character register. 157 void LoadCurrentCharacterUnchecked(int cp_offset, int character_count); 158 159 // Check whether preemption has been requested. 160 void CheckPreemption(); 161 162 // Check whether we are exceeding the stack limit on the backtrack stack. 163 void CheckStackLimit(); 164 165 166 // Generate a call to CheckStackGuardState. 167 void CallCheckStackGuardState(Register scratch); 168 169 // The ebp-relative location of a regexp register. 170 MemOperand register_location(int register_index); 171 172 // Register holding the current input position as negative offset from 173 // the end of the string. 174 inline Register current_input_offset() { return t2; } 175 176 // The register containing the current character after LoadCurrentCharacter. 177 inline Register current_character() { return t3; } 178 179 // Register holding address of the end of the input string. 180 inline Register end_of_input_address() { return t6; } 181 182 // Register holding the frame address. Local variables, parameters and 183 // regexp registers are addressed relative to this. 184 inline Register frame_pointer() { return fp; } 185 186 // The register containing the backtrack stack top. Provides a meaningful 187 // name to the register. 188 inline Register backtrack_stackpointer() { return t4; } 189 190 // Register holding pointer to the current code object. 191 inline Register code_pointer() { return t1; } 192 193 // Byte size of chars in the string to match (decided by the Mode argument). 194 inline int char_size() { return static_cast<int>(mode_); } 195 196 // Equivalent to a conditional branch to the label, unless the label 197 // is NULL, in which case it is a conditional Backtrack. 198 void BranchOrBacktrack(Label* to, 199 Condition condition, 200 Register rs, 201 const Operand& rt); 202 203 // Call and return internally in the generated code in a way that 204 // is GC-safe (i.e., doesn't leave absolute code addresses on the stack) 205 inline void SafeCall(Label* to, 206 Condition cond, 207 Register rs, 208 const Operand& rt); 209 inline void SafeReturn(); 210 inline void SafeCallTarget(Label* name); 211 212 // Pushes the value of a register on the backtrack stack. Decrements the 213 // stack pointer by a word size and stores the register's value there. 214 inline void Push(Register source); 215 216 // Pops a value from the backtrack stack. Reads the word at the stack pointer 217 // and increments it by a word size. 218 inline void Pop(Register target); 219 220 // Calls a C function and cleans up the frame alignment done by 221 // by FrameAlign. The called function *is* allowed to trigger a garbage 222 // collection, but may not take more than four arguments (no arguments 223 // passed on the stack), and the first argument will be a pointer to the 224 // return address. 225 inline void CallCFunctionUsingStub(ExternalReference function, 226 int num_arguments); 227 228 Isolate* isolate() const { return masm_->isolate(); } 229 230 MacroAssembler* masm_; 231 232 // Which mode to generate code for (ASCII or UC16). 233 Mode mode_; 234 235 // One greater than maximal register index actually used. 236 int num_registers_; 237 238 // Number of registers to output at the end (the saved registers 239 // are always 0..num_saved_registers_-1). 240 int num_saved_registers_; 241 242 // Labels used internally. 243 Label entry_label_; 244 Label start_label_; 245 Label success_label_; 246 Label backtrack_label_; 247 Label exit_label_; 248 Label check_preempt_label_; 249 Label stack_overflow_label_; 250 Label internal_failure_label_; 251 }; 252 253 #endif // V8_INTERPRETED_REGEXP 254 255 256 }} // namespace v8::internal 257 258 #endif // V8_MIPS_REGEXP_MACRO_ASSEMBLER_MIPS_H_ 259
