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/codegen/ia32/assembler-ia32.h" 9 #include "src/codegen/macro-assembler.h" 10 #include "src/regexp/regexp-macro-assembler.h" 11 12 namespace v8 { 13 namespace internal { 14 15 class V8_EXPORT_PRIVATE RegExpMacroAssemblerIA32 16 : 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(int cp_offset, 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 LoadCurrentCharacterUnchecked(int cp_offset, 70 int character_count); 71 virtual void PopCurrentPosition(); 72 virtual void PopRegister(int register_index); 73 virtual void PushBacktrack(Label* label); 74 virtual void PushCurrentPosition(); 75 virtual void PushRegister(int register_index, 76 StackCheckFlag check_stack_limit); 77 virtual void ReadCurrentPositionFromRegister(int reg); 78 virtual void ReadStackPointerFromRegister(int reg); 79 virtual void SetCurrentPositionFromEnd(int by); 80 virtual void SetRegister(int register_index, int to); 81 virtual bool Succeed(); 82 virtual void WriteCurrentPositionToRegister(int reg, int cp_offset); 83 virtual void ClearRegisters(int reg_from, int reg_to); 84 virtual void WriteStackPointerToRegister(int reg); 85 86 // Called from RegExp if the stack-guard is triggered. 87 // If the code object is relocated, the return address is fixed before 88 // returning. 89 // {raw_code} is an Address because this is called via ExternalReference. 90 static int CheckStackGuardState(Address* return_address, Address raw_code, 91 Address re_frame); 92 93 private: 94 Operand StaticVariable(const ExternalReference& ext); 95 // Offsets from ebp of function parameters and stored registers. 96 static const int kFramePointer = 0; 97 // Above the frame pointer - function parameters and return address. 98 static const int kReturn_eip = kFramePointer + kSystemPointerSize; 99 static const int kFrameAlign = kReturn_eip + kSystemPointerSize; 100 // Parameters. 101 static const int kInputString = kFrameAlign; 102 static const int kStartIndex = kInputString + kSystemPointerSize; 103 static const int kInputStart = kStartIndex + kSystemPointerSize; 104 static const int kInputEnd = kInputStart + kSystemPointerSize; 105 static const int kRegisterOutput = kInputEnd + kSystemPointerSize; 106 // For the case of global regular expression, we have room to store at least 107 // one set of capture results. For the case of non-global regexp, we ignore 108 // this value. 109 static const int kNumOutputRegisters = kRegisterOutput + kSystemPointerSize; 110 static const int kStackHighEnd = kNumOutputRegisters + kSystemPointerSize; 111 static const int kDirectCall = kStackHighEnd + kSystemPointerSize; 112 static const int kIsolate = kDirectCall + kSystemPointerSize; 113 // Below the frame pointer - local stack variables. 114 // When adding local variables remember to push space for them in 115 // the frame in GetCode. 116 static const int kBackup_esi = kFramePointer - kSystemPointerSize; 117 static const int kBackup_edi = kBackup_esi - kSystemPointerSize; 118 static const int kBackup_ebx = kBackup_edi - kSystemPointerSize; 119 static const int kSuccessfulCaptures = kBackup_ebx - kSystemPointerSize; 120 static const int kStringStartMinusOne = 121 kSuccessfulCaptures - kSystemPointerSize; 122 static const int kBacktrackCount = kStringStartMinusOne - kSystemPointerSize; 123 // First register address. Following registers are below it on the stack. 124 static const int kRegisterZero = kBacktrackCount - kSystemPointerSize; 125 126 // Initial size of code buffer. 127 static const int kRegExpCodeSize = 1024; 128 129 // Check whether preemption has been requested. 130 void CheckPreemption(); 131 132 // Check whether we are exceeding the stack limit on the backtrack stack. 133 void CheckStackLimit(); 134 135 // Generate a call to CheckStackGuardState. 136 void CallCheckStackGuardState(Register scratch); 137 138 // The ebp-relative location of a regexp register. 139 Operand register_location(int register_index); 140 141 // The register containing the current character after LoadCurrentCharacter. current_character()142 inline Register current_character() { return edx; } 143 144 // The register containing the backtrack stack top. Provides a meaningful 145 // name to the register. backtrack_stackpointer()146 inline Register backtrack_stackpointer() { return ecx; } 147 148 // Byte size of chars in the string to match (decided by the Mode argument) char_size()149 inline int char_size() { return static_cast<int>(mode_); } 150 151 // Equivalent to a conditional branch to the label, unless the label 152 // is nullptr, in which case it is a conditional Backtrack. 153 void BranchOrBacktrack(Condition condition, Label* to); 154 155 // Call and return internally in the generated code in a way that 156 // is GC-safe (i.e., doesn't leave absolute code addresses on the stack) 157 inline void SafeCall(Label* to); 158 inline void SafeReturn(); 159 inline void SafeCallTarget(Label* name); 160 161 // Pushes the value of a register on the backtrack stack. Decrements the 162 // stack pointer (ecx) by a word size and stores the register's value there. 163 inline void Push(Register source); 164 165 // Pushes a value on the backtrack stack. Decrements the stack pointer (ecx) 166 // by a word size and stores the value there. 167 inline void Push(Immediate value); 168 169 // Pops a value from the backtrack stack. Reads the word at the stack pointer 170 // (ecx) and increments it by a word size. 171 inline void Pop(Register target); 172 isolate()173 Isolate* isolate() const { return masm_->isolate(); } 174 175 MacroAssembler* masm_; 176 177 // Which mode to generate code for (LATIN1 or UC16). 178 Mode mode_; 179 180 // One greater than maximal register index actually used. 181 int num_registers_; 182 183 // Number of registers to output at the end (the saved registers 184 // are always 0..num_saved_registers_-1) 185 int num_saved_registers_; 186 187 // Labels used internally. 188 Label entry_label_; 189 Label start_label_; 190 Label success_label_; 191 Label backtrack_label_; 192 Label exit_label_; 193 Label check_preempt_label_; 194 Label stack_overflow_label_; 195 Label fallback_label_; 196 }; 197 198 } // namespace internal 199 } // namespace v8 200 201 #endif // V8_REGEXP_IA32_REGEXP_MACRO_ASSEMBLER_IA32_H_ 202