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 #ifndef V8_REGEXP_MIPS_REGEXP_MACRO_ASSEMBLER_MIPS_H_ 6 #define V8_REGEXP_MIPS_REGEXP_MACRO_ASSEMBLER_MIPS_H_ 7 8 #include "src/macro-assembler.h" 9 #include "src/mips/assembler-mips.h" 10 #include "src/regexp/regexp-macro-assembler.h" 11 12 namespace v8 { 13 namespace internal { 14 15 #ifndef V8_INTERPRETED_REGEXP 16 class RegExpMacroAssemblerMIPS: public NativeRegExpMacroAssembler { 17 public: 18 RegExpMacroAssemblerMIPS(Isolate* isolate, Zone* zone, Mode mode, 19 int registers_to_save); 20 virtual ~RegExpMacroAssemblerMIPS(); 21 virtual int stack_limit_slack(); 22 virtual void AdvanceCurrentPosition(int by); 23 virtual void AdvanceRegister(int reg, int by); 24 virtual void Backtrack(); 25 virtual void Bind(Label* label); 26 virtual void CheckAtStart(Label* on_at_start); 27 virtual void CheckCharacter(uint32_t c, Label* on_equal); 28 virtual void CheckCharacterAfterAnd(uint32_t c, 29 uint32_t mask, 30 Label* on_equal); 31 virtual void CheckCharacterGT(uc16 limit, Label* on_greater); 32 virtual void CheckCharacterLT(uc16 limit, Label* on_less); 33 // A "greedy loop" is a loop that is both greedy and with a simple 34 // body. It has a particularly simple implementation. 35 virtual void CheckGreedyLoop(Label* on_tos_equals_current_position); 36 virtual void CheckNotAtStart(int cp_offset, Label* on_not_at_start); 37 virtual void CheckNotBackReference(int start_reg, bool read_backward, 38 Label* on_no_match); 39 virtual void CheckNotBackReferenceIgnoreCase(int start_reg, 40 bool read_backward, 41 Label* on_no_match); 42 virtual void CheckNotCharacter(uint32_t c, Label* on_not_equal); 43 virtual void CheckNotCharacterAfterAnd(uint32_t c, 44 uint32_t mask, 45 Label* on_not_equal); 46 virtual void CheckNotCharacterAfterMinusAnd(uc16 c, 47 uc16 minus, 48 uc16 mask, 49 Label* on_not_equal); 50 virtual void CheckCharacterInRange(uc16 from, 51 uc16 to, 52 Label* on_in_range); 53 virtual void CheckCharacterNotInRange(uc16 from, 54 uc16 to, 55 Label* on_not_in_range); 56 virtual void CheckBitInTable(Handle<ByteArray> table, Label* on_bit_set); 57 58 // Checks whether the given offset from the current position is before 59 // the end of the string. 60 virtual void CheckPosition(int cp_offset, Label* on_outside_input); 61 virtual bool CheckSpecialCharacterClass(uc16 type, 62 Label* on_no_match); 63 virtual void Fail(); 64 virtual Handle<HeapObject> GetCode(Handle<String> source); 65 virtual void GoTo(Label* label); 66 virtual void IfRegisterGE(int reg, int comparand, Label* if_ge); 67 virtual void IfRegisterLT(int reg, int comparand, Label* if_lt); 68 virtual void IfRegisterEqPos(int reg, Label* if_eq); 69 virtual IrregexpImplementation Implementation(); 70 virtual void LoadCurrentCharacter(int cp_offset, 71 Label* on_end_of_input, 72 bool check_bounds = true, 73 int characters = 1); 74 virtual void PopCurrentPosition(); 75 virtual void PopRegister(int register_index); 76 virtual void PushBacktrack(Label* label); 77 virtual void PushCurrentPosition(); 78 virtual void PushRegister(int register_index, 79 StackCheckFlag check_stack_limit); 80 virtual void ReadCurrentPositionFromRegister(int reg); 81 virtual void ReadStackPointerFromRegister(int reg); 82 virtual void SetCurrentPositionFromEnd(int by); 83 virtual void SetRegister(int register_index, int to); 84 virtual bool Succeed(); 85 virtual void WriteCurrentPositionToRegister(int reg, int cp_offset); 86 virtual void ClearRegisters(int reg_from, int reg_to); 87 virtual void WriteStackPointerToRegister(int reg); 88 virtual bool CanReadUnaligned(); 89 90 // Called from RegExp if the stack-guard is triggered. 91 // If the code object is relocated, the return address is fixed before 92 // returning. 93 static int CheckStackGuardState(Address* return_address, 94 Code* re_code, 95 Address re_frame); 96 97 private: 98 // Offsets from frame_pointer() of function parameters and stored registers. 99 static const int kFramePointer = 0; 100 101 // Above the frame pointer - Stored registers and stack passed parameters. 102 // Registers s0 to s7, fp, and ra. 103 static const int kStoredRegisters = kFramePointer; 104 // Return address (stored from link register, read into pc on return). 105 static const int kReturnAddress = kStoredRegisters + 9 * kPointerSize; 106 static const int kSecondaryReturnAddress = kReturnAddress + kPointerSize; 107 // Stack frame header. 108 static const int kStackFrameHeader = kReturnAddress + kPointerSize; 109 // Stack parameters placed by caller. 110 static const int kRegisterOutput = kStackFrameHeader + 20; 111 static const int kNumOutputRegisters = kRegisterOutput + kPointerSize; 112 static const int kStackHighEnd = kNumOutputRegisters + kPointerSize; 113 static const int kDirectCall = kStackHighEnd + kPointerSize; 114 static const int kIsolate = kDirectCall + kPointerSize; 115 116 // Below the frame pointer. 117 // Register parameters stored by setup code. 118 static const int kInputEnd = kFramePointer - kPointerSize; 119 static const int kInputStart = kInputEnd - kPointerSize; 120 static const int kStartIndex = kInputStart - kPointerSize; 121 static const int kInputString = kStartIndex - kPointerSize; 122 // When adding local variables remember to push space for them in 123 // the frame in GetCode. 124 static const int kSuccessfulCaptures = kInputString - kPointerSize; 125 static const int kStringStartMinusOne = kSuccessfulCaptures - kPointerSize; 126 // First register address. Following registers are below it on the stack. 127 static const int kRegisterZero = kStringStartMinusOne - kPointerSize; 128 129 // Initial size of code buffer. 130 static const size_t kRegExpCodeSize = 1024; 131 132 // Load a number of characters at the given offset from the 133 // current position, into the current-character register. 134 void LoadCurrentCharacterUnchecked(int cp_offset, int character_count); 135 136 // Check whether preemption has been requested. 137 void CheckPreemption(); 138 139 // Check whether we are exceeding the stack limit on the backtrack stack. 140 void CheckStackLimit(); 141 142 143 // Generate a call to CheckStackGuardState. 144 void CallCheckStackGuardState(Register scratch); 145 146 // The ebp-relative location of a regexp register. 147 MemOperand register_location(int register_index); 148 149 // Register holding the current input position as negative offset from 150 // the end of the string. current_input_offset()151 inline Register current_input_offset() { return t2; } 152 153 // The register containing the current character after LoadCurrentCharacter. current_character()154 inline Register current_character() { return t3; } 155 156 // Register holding address of the end of the input string. end_of_input_address()157 inline Register end_of_input_address() { return t6; } 158 159 // Register holding the frame address. Local variables, parameters and 160 // regexp registers are addressed relative to this. frame_pointer()161 inline Register frame_pointer() { return fp; } 162 163 // The register containing the backtrack stack top. Provides a meaningful 164 // name to the register. backtrack_stackpointer()165 inline Register backtrack_stackpointer() { return t4; } 166 167 // Register holding pointer to the current code object. code_pointer()168 inline Register code_pointer() { return t1; } 169 170 // Byte size of chars in the string to match (decided by the Mode argument). char_size()171 inline int char_size() { return static_cast<int>(mode_); } 172 173 // Equivalent to a conditional branch to the label, unless the label 174 // is NULL, in which case it is a conditional Backtrack. 175 void BranchOrBacktrack(Label* to, 176 Condition condition, 177 Register rs, 178 const Operand& rt); 179 180 // Call and return internally in the generated code in a way that 181 // is GC-safe (i.e., doesn't leave absolute code addresses on the stack) 182 inline void SafeCall(Label* to, 183 Condition cond, 184 Register rs, 185 const Operand& rt); 186 inline void SafeReturn(); 187 inline void SafeCallTarget(Label* name); 188 189 // Pushes the value of a register on the backtrack stack. Decrements the 190 // stack pointer by a word size and stores the register's value there. 191 inline void Push(Register source); 192 193 // Pops a value from the backtrack stack. Reads the word at the stack pointer 194 // and increments it by a word size. 195 inline void Pop(Register target); 196 isolate()197 Isolate* isolate() const { return masm_->isolate(); } 198 199 MacroAssembler* masm_; 200 201 // Which mode to generate code for (Latin1 or UC16). 202 Mode mode_; 203 204 // One greater than maximal register index actually used. 205 int num_registers_; 206 207 // Number of registers to output at the end (the saved registers 208 // are always 0..num_saved_registers_-1). 209 int num_saved_registers_; 210 211 // Labels used internally. 212 Label entry_label_; 213 Label start_label_; 214 Label success_label_; 215 Label backtrack_label_; 216 Label exit_label_; 217 Label check_preempt_label_; 218 Label stack_overflow_label_; 219 Label internal_failure_label_; 220 }; 221 222 #endif // V8_INTERPRETED_REGEXP 223 224 225 } // namespace internal 226 } // namespace v8 227 228 #endif // V8_REGEXP_MIPS_REGEXP_MACRO_ASSEMBLER_MIPS_H_ 229