1 // Copyright 2012 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_IA32_REGEXP_MACRO_ASSEMBLER_IA32_H_ 6 #define V8_REGEXP_IA32_REGEXP_MACRO_ASSEMBLER_IA32_H_ 7 8 #include "src/ia32/assembler-ia32.h" 9 #include "src/macro-assembler.h" 10 #include "src/regexp/regexp-macro-assembler.h" 11 12 namespace v8 { 13 namespace internal { 14 15 #ifndef V8_INTERPRETED_REGEXP 16 class RegExpMacroAssemblerIA32: public NativeRegExpMacroAssembler { 17 public: 18 RegExpMacroAssemblerIA32(Isolate* isolate, Zone* zone, Mode mode, 19 int registers_to_save); 20 virtual ~RegExpMacroAssemblerIA32(); 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, bool unicode, 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, 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 88 // Called from RegExp if the stack-guard is triggered. 89 // If the code object is relocated, the return address is fixed before 90 // returning. 91 static int CheckStackGuardState(Address* return_address, 92 Code* re_code, 93 Address re_frame); 94 95 private: 96 // Offsets from ebp of function parameters and stored registers. 97 static const int kFramePointer = 0; 98 // Above the frame pointer - function parameters and return address. 99 static const int kReturn_eip = kFramePointer + kPointerSize; 100 static const int kFrameAlign = kReturn_eip + kPointerSize; 101 // Parameters. 102 static const int kInputString = kFrameAlign; 103 static const int kStartIndex = kInputString + kPointerSize; 104 static const int kInputStart = kStartIndex + kPointerSize; 105 static const int kInputEnd = kInputStart + kPointerSize; 106 static const int kRegisterOutput = kInputEnd + kPointerSize; 107 // For the case of global regular expression, we have room to store at least 108 // one set of capture results. For the case of non-global regexp, we ignore 109 // this value. 110 static const int kNumOutputRegisters = kRegisterOutput + kPointerSize; 111 static const int kStackHighEnd = kNumOutputRegisters + kPointerSize; 112 static const int kDirectCall = kStackHighEnd + kPointerSize; 113 static const int kIsolate = kDirectCall + kPointerSize; 114 // Below the frame pointer - local stack variables. 115 // When adding local variables remember to push space for them in 116 // the frame in GetCode. 117 static const int kBackup_esi = kFramePointer - kPointerSize; 118 static const int kBackup_edi = kBackup_esi - kPointerSize; 119 static const int kBackup_ebx = kBackup_edi - kPointerSize; 120 static const int kSuccessfulCaptures = kBackup_ebx - kPointerSize; 121 static const int kStringStartMinusOne = kSuccessfulCaptures - kPointerSize; 122 // First register address. Following registers are below it on the stack. 123 static const int kRegisterZero = kStringStartMinusOne - kPointerSize; 124 125 // Initial size of code buffer. 126 static const size_t kRegExpCodeSize = 1024; 127 128 // Load a number of characters at the given offset from the 129 // current position, into the current-character register. 130 void LoadCurrentCharacterUnchecked(int cp_offset, int character_count); 131 132 // Check whether preemption has been requested. 133 void CheckPreemption(); 134 135 // Check whether we are exceeding the stack limit on the backtrack stack. 136 void CheckStackLimit(); 137 138 // Generate a call to CheckStackGuardState. 139 void CallCheckStackGuardState(Register scratch); 140 141 // The ebp-relative location of a regexp register. 142 Operand register_location(int register_index); 143 144 // The register containing the current character after LoadCurrentCharacter. current_character()145 inline Register current_character() { return edx; } 146 147 // The register containing the backtrack stack top. Provides a meaningful 148 // name to the register. backtrack_stackpointer()149 inline Register backtrack_stackpointer() { return ecx; } 150 151 // Byte size of chars in the string to match (decided by the Mode argument) char_size()152 inline int char_size() { return static_cast<int>(mode_); } 153 154 // Equivalent to a conditional branch to the label, unless the label 155 // is nullptr, in which case it is a conditional Backtrack. 156 void BranchOrBacktrack(Condition condition, Label* to); 157 158 // Call and return internally in the generated code in a way that 159 // is GC-safe (i.e., doesn't leave absolute code addresses on the stack) 160 inline void SafeCall(Label* to); 161 inline void SafeReturn(); 162 inline void SafeCallTarget(Label* name); 163 164 // Pushes the value of a register on the backtrack stack. Decrements the 165 // stack pointer (ecx) by a word size and stores the register's value there. 166 inline void Push(Register source); 167 168 // Pushes a value on the backtrack stack. Decrements the stack pointer (ecx) 169 // by a word size and stores the value there. 170 inline void Push(Immediate value); 171 172 // Pops a value from the backtrack stack. Reads the word at the stack pointer 173 // (ecx) and increments it by a word size. 174 inline void Pop(Register target); 175 isolate()176 Isolate* isolate() const { return masm_->isolate(); } 177 178 MacroAssembler* masm_; 179 180 // Which mode to generate code for (LATIN1 or UC16). 181 Mode mode_; 182 183 // One greater than maximal register index actually used. 184 int num_registers_; 185 186 // Number of registers to output at the end (the saved registers 187 // are always 0..num_saved_registers_-1) 188 int num_saved_registers_; 189 190 // Labels used internally. 191 Label entry_label_; 192 Label start_label_; 193 Label success_label_; 194 Label backtrack_label_; 195 Label exit_label_; 196 Label check_preempt_label_; 197 Label stack_overflow_label_; 198 }; 199 #endif // V8_INTERPRETED_REGEXP 200 201 } // namespace internal 202 } // namespace v8 203 204 #endif // V8_REGEXP_IA32_REGEXP_MACRO_ASSEMBLER_IA32_H_ 205