1 // Copyright 2011 the V8 project authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 6 #ifndef V8_MIPS_REGEXP_MACRO_ASSEMBLER_MIPS_H_ 7 #define V8_MIPS_REGEXP_MACRO_ASSEMBLER_MIPS_H_ 8 9 #include "src/macro-assembler.h" 10 #include "src/mips64/assembler-mips64-inl.h" 11 #include "src/mips64/assembler-mips64.h" 12 #include "src/mips64/macro-assembler-mips64.h" 13 14 namespace v8 { 15 namespace internal { 16 17 #ifndef V8_INTERPRETED_REGEXP 18 class RegExpMacroAssemblerMIPS: public NativeRegExpMacroAssembler { 19 public: 20 RegExpMacroAssemblerMIPS(Mode mode, int registers_to_save, Zone* zone); 21 virtual ~RegExpMacroAssemblerMIPS(); 22 virtual int stack_limit_slack(); 23 virtual void AdvanceCurrentPosition(int by); 24 virtual void AdvanceRegister(int reg, int by); 25 virtual void Backtrack(); 26 virtual void Bind(Label* label); 27 virtual void CheckAtStart(Label* on_at_start); 28 virtual void CheckCharacter(uint32_t c, Label* on_equal); 29 virtual void CheckCharacterAfterAnd(uint32_t c, 30 uint32_t mask, 31 Label* on_equal); 32 virtual void CheckCharacterGT(uc16 limit, Label* on_greater); 33 virtual void CheckCharacterLT(uc16 limit, Label* on_less); 34 // A "greedy loop" is a loop that is both greedy and with a simple 35 // body. It has a particularly simple implementation. 36 virtual void CheckGreedyLoop(Label* on_tos_equals_current_position); 37 virtual void CheckNotAtStart(Label* on_not_at_start); 38 virtual void CheckNotBackReference(int start_reg, Label* on_no_match); 39 virtual void CheckNotBackReferenceIgnoreCase(int start_reg, 40 Label* on_no_match); 41 virtual void CheckNotCharacter(uint32_t c, Label* on_not_equal); 42 virtual void CheckNotCharacterAfterAnd(uint32_t c, 43 uint32_t mask, 44 Label* on_not_equal); 45 virtual void CheckNotCharacterAfterMinusAnd(uc16 c, 46 uc16 minus, 47 uc16 mask, 48 Label* on_not_equal); 49 virtual void CheckCharacterInRange(uc16 from, 50 uc16 to, 51 Label* on_in_range); 52 virtual void CheckCharacterNotInRange(uc16 from, 53 uc16 to, 54 Label* on_not_in_range); 55 virtual void CheckBitInTable(Handle<ByteArray> table, Label* on_bit_set); 56 57 // Checks whether the given offset from the current position is before 58 // the end of the string. 59 virtual void CheckPosition(int cp_offset, Label* on_outside_input); 60 virtual bool CheckSpecialCharacterClass(uc16 type, 61 Label* on_no_match); 62 virtual void Fail(); 63 virtual Handle<HeapObject> GetCode(Handle<String> source); 64 virtual void GoTo(Label* label); 65 virtual void IfRegisterGE(int reg, int comparand, Label* if_ge); 66 virtual void IfRegisterLT(int reg, int comparand, Label* if_lt); 67 virtual void IfRegisterEqPos(int reg, Label* if_eq); 68 virtual IrregexpImplementation Implementation(); 69 virtual void LoadCurrentCharacter(int cp_offset, 70 Label* on_end_of_input, 71 bool check_bounds = true, 72 int characters = 1); 73 virtual void PopCurrentPosition(); 74 virtual void PopRegister(int register_index); 75 virtual void PushBacktrack(Label* label); 76 virtual void PushCurrentPosition(); 77 virtual void PushRegister(int register_index, 78 StackCheckFlag check_stack_limit); 79 virtual void ReadCurrentPositionFromRegister(int reg); 80 virtual void ReadStackPointerFromRegister(int reg); 81 virtual void SetCurrentPositionFromEnd(int by); 82 virtual void SetRegister(int register_index, int to); 83 virtual bool Succeed(); 84 virtual void WriteCurrentPositionToRegister(int reg, int cp_offset); 85 virtual void ClearRegisters(int reg_from, int reg_to); 86 virtual void WriteStackPointerToRegister(int reg); 87 virtual bool CanReadUnaligned(); 88 89 // Called from RegExp if the stack-guard is triggered. 90 // If the code object is relocated, the return address is fixed before 91 // returning. 92 static int CheckStackGuardState(Address* return_address, 93 Code* re_code, 94 Address re_frame); 95 96 void print_regexp_frame_constants(); 97 98 private: 99 #if defined(MIPS_ABI_N64) 100 // Offsets from frame_pointer() of function parameters and stored registers. 101 static const int kFramePointer = 0; 102 103 // Above the frame pointer - Stored registers and stack passed parameters. 104 // Registers s0 to s7, fp, and ra. 105 static const int kStoredRegisters = kFramePointer; 106 // Return address (stored from link register, read into pc on return). 107 108 // TODO(plind): This 9 - is 8 s-regs (s0..s7) plus fp. 109 110 static const int kReturnAddress = kStoredRegisters + 9 * kPointerSize; 111 static const int kSecondaryReturnAddress = kReturnAddress + kPointerSize; 112 // Stack frame header. 113 static const int kStackFrameHeader = kSecondaryReturnAddress; 114 // Stack parameters placed by caller. 115 static const int kIsolate = kStackFrameHeader + kPointerSize; 116 117 // Below the frame pointer. 118 // Register parameters stored by setup code. 119 static const int kDirectCall = kFramePointer - kPointerSize; 120 static const int kStackHighEnd = kDirectCall - kPointerSize; 121 static const int kNumOutputRegisters = kStackHighEnd - kPointerSize; 122 static const int kRegisterOutput = kNumOutputRegisters - kPointerSize; 123 static const int kInputEnd = kRegisterOutput - kPointerSize; 124 static const int kInputStart = kInputEnd - kPointerSize; 125 static const int kStartIndex = kInputStart - kPointerSize; 126 static const int kInputString = kStartIndex - kPointerSize; 127 // When adding local variables remember to push space for them in 128 // the frame in GetCode. 129 static const int kSuccessfulCaptures = kInputString - kPointerSize; 130 static const int kInputStartMinusOne = kSuccessfulCaptures - kPointerSize; 131 // First register address. Following registers are below it on the stack. 132 static const int kRegisterZero = kInputStartMinusOne - kPointerSize; 133 134 #elif defined(MIPS_ABI_O32) 135 // Offsets from frame_pointer() of function parameters and stored registers. 136 static const int kFramePointer = 0; 137 138 // Above the frame pointer - Stored registers and stack passed parameters. 139 // Registers s0 to s7, fp, and ra. 140 static const int kStoredRegisters = kFramePointer; 141 // Return address (stored from link register, read into pc on return). 142 static const int kReturnAddress = kStoredRegisters + 9 * kPointerSize; 143 static const int kSecondaryReturnAddress = kReturnAddress + kPointerSize; 144 // Stack frame header. 145 static const int kStackFrameHeader = kReturnAddress + kPointerSize; 146 // Stack parameters placed by caller. 147 static const int kRegisterOutput = 148 kStackFrameHeader + 4 * kPointerSize + kPointerSize; 149 static const int kNumOutputRegisters = kRegisterOutput + kPointerSize; 150 static const int kStackHighEnd = kNumOutputRegisters + kPointerSize; 151 static const int kDirectCall = kStackHighEnd + kPointerSize; 152 static const int kIsolate = kDirectCall + kPointerSize; 153 154 // Below the frame pointer. 155 // Register parameters stored by setup code. 156 static const int kInputEnd = kFramePointer - kPointerSize; 157 static const int kInputStart = kInputEnd - kPointerSize; 158 static const int kStartIndex = kInputStart - kPointerSize; 159 static const int kInputString = kStartIndex - kPointerSize; 160 // When adding local variables remember to push space for them in 161 // the frame in GetCode. 162 static const int kSuccessfulCaptures = kInputString - kPointerSize; 163 static const int kInputStartMinusOne = kSuccessfulCaptures - kPointerSize; 164 // First register address. Following registers are below it on the stack. 165 static const int kRegisterZero = kInputStartMinusOne - kPointerSize; 166 167 #else 168 # error "undefined MIPS ABI" 169 #endif 170 171 // Initial size of code buffer. 172 static const size_t kRegExpCodeSize = 1024; 173 174 // Load a number of characters at the given offset from the 175 // current position, into the current-character register. 176 void LoadCurrentCharacterUnchecked(int cp_offset, int character_count); 177 178 // Check whether preemption has been requested. 179 void CheckPreemption(); 180 181 // Check whether we are exceeding the stack limit on the backtrack stack. 182 void CheckStackLimit(); 183 184 185 // Generate a call to CheckStackGuardState. 186 void CallCheckStackGuardState(Register scratch); 187 188 // The ebp-relative location of a regexp register. 189 MemOperand register_location(int register_index); 190 191 // Register holding the current input position as negative offset from 192 // the end of the string. 193 inline Register current_input_offset() { return a6; } 194 195 // The register containing the current character after LoadCurrentCharacter. 196 inline Register current_character() { return a7; } 197 198 // Register holding address of the end of the input string. 199 inline Register end_of_input_address() { return t2; } 200 201 // Register holding the frame address. Local variables, parameters and 202 // regexp registers are addressed relative to this. 203 inline Register frame_pointer() { return fp; } 204 205 // The register containing the backtrack stack top. Provides a meaningful 206 // name to the register. 207 inline Register backtrack_stackpointer() { return t0; } 208 209 // Register holding pointer to the current code object. 210 inline Register code_pointer() { return a5; } 211 212 // Byte size of chars in the string to match (decided by the Mode argument). 213 inline int char_size() { return static_cast<int>(mode_); } 214 215 // Equivalent to a conditional branch to the label, unless the label 216 // is NULL, in which case it is a conditional Backtrack. 217 void BranchOrBacktrack(Label* to, 218 Condition condition, 219 Register rs, 220 const Operand& rt); 221 222 // Call and return internally in the generated code in a way that 223 // is GC-safe (i.e., doesn't leave absolute code addresses on the stack) 224 inline void SafeCall(Label* to, 225 Condition cond, 226 Register rs, 227 const Operand& rt); 228 inline void SafeReturn(); 229 inline void SafeCallTarget(Label* name); 230 231 // Pushes the value of a register on the backtrack stack. Decrements the 232 // stack pointer by a word size and stores the register's value there. 233 inline void Push(Register source); 234 235 // Pops a value from the backtrack stack. Reads the word at the stack pointer 236 // and increments it by a word size. 237 inline void Pop(Register target); 238 239 Isolate* isolate() const { return masm_->isolate(); } 240 241 MacroAssembler* masm_; 242 243 // Which mode to generate code for (Latin1 or UC16). 244 Mode mode_; 245 246 // One greater than maximal register index actually used. 247 int num_registers_; 248 249 // Number of registers to output at the end (the saved registers 250 // are always 0..num_saved_registers_-1). 251 int num_saved_registers_; 252 253 // Labels used internally. 254 Label entry_label_; 255 Label start_label_; 256 Label success_label_; 257 Label backtrack_label_; 258 Label exit_label_; 259 Label check_preempt_label_; 260 Label stack_overflow_label_; 261 Label internal_failure_label_; 262 }; 263 264 #endif // V8_INTERPRETED_REGEXP 265 266 267 }} // namespace v8::internal 268 269 #endif // V8_MIPS_REGEXP_MACRO_ASSEMBLER_MIPS_H_ 270
