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_ARM_REGEXP_MACRO_ASSEMBLER_ARM_H_ 6 #define V8_ARM_REGEXP_MACRO_ASSEMBLER_ARM_H_ 7 8 #include "src/arm/assembler-arm.h" 9 #include "src/arm/assembler-arm-inl.h" 10 #include "src/macro-assembler.h" 11 12 namespace v8 { 13 namespace internal { 14 15 16 #ifndef V8_INTERPRETED_REGEXP 17 class RegExpMacroAssemblerARM: public NativeRegExpMacroAssembler { 18 public: 19 RegExpMacroAssemblerARM(Mode mode, int registers_to_save, Zone* zone); 20 virtual ~RegExpMacroAssemblerARM(); 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(unsigned c, Label* on_equal); 28 virtual void CheckCharacterAfterAnd(unsigned c, 29 unsigned 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(Label* on_not_at_start); 37 virtual void CheckNotBackReference(int start_reg, Label* on_no_match); 38 virtual void CheckNotBackReferenceIgnoreCase(int start_reg, 39 Label* on_no_match); 40 virtual void CheckNotCharacter(unsigned c, Label* on_not_equal); 41 virtual void CheckNotCharacterAfterAnd(unsigned c, 42 unsigned mask, 43 Label* on_not_equal); 44 virtual void CheckNotCharacterAfterMinusAnd(uc16 c, 45 uc16 minus, 46 uc16 mask, 47 Label* on_not_equal); 48 virtual void CheckCharacterInRange(uc16 from, 49 uc16 to, 50 Label* on_in_range); 51 virtual void CheckCharacterNotInRange(uc16 from, 52 uc16 to, 53 Label* on_not_in_range); 54 virtual void CheckBitInTable(Handle<ByteArray> table, Label* on_bit_set); 55 56 // Checks whether the given offset from the current position is before 57 // the end of the string. 58 virtual void CheckPosition(int cp_offset, Label* on_outside_input); 59 virtual bool CheckSpecialCharacterClass(uc16 type, 60 Label* on_no_match); 61 virtual void Fail(); 62 virtual Handle<HeapObject> GetCode(Handle<String> source); 63 virtual void GoTo(Label* label); 64 virtual void IfRegisterGE(int reg, int comparand, Label* if_ge); 65 virtual void IfRegisterLT(int reg, int comparand, Label* if_lt); 66 virtual void IfRegisterEqPos(int reg, Label* if_eq); 67 virtual IrregexpImplementation Implementation(); 68 virtual void LoadCurrentCharacter(int cp_offset, 69 Label* on_end_of_input, 70 bool check_bounds = true, 71 int characters = 1); 72 virtual void PopCurrentPosition(); 73 virtual void PopRegister(int register_index); 74 virtual void PushBacktrack(Label* label); 75 virtual void PushCurrentPosition(); 76 virtual void PushRegister(int register_index, 77 StackCheckFlag check_stack_limit); 78 virtual void ReadCurrentPositionFromRegister(int reg); 79 virtual void ReadStackPointerFromRegister(int reg); 80 virtual void SetCurrentPositionFromEnd(int by); 81 virtual void SetRegister(int register_index, int to); 82 virtual bool Succeed(); 83 virtual void WriteCurrentPositionToRegister(int reg, int cp_offset); 84 virtual void ClearRegisters(int reg_from, int reg_to); 85 virtual void WriteStackPointerToRegister(int reg); 86 virtual bool CanReadUnaligned(); 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 frame_pointer() of function parameters and stored registers. 97 static const int kFramePointer = 0; 98 99 // Above the frame pointer - Stored registers and stack passed parameters. 100 // Register 4..11. 101 static const int kStoredRegisters = kFramePointer; 102 // Return address (stored from link register, read into pc on return). 103 static const int kReturnAddress = kStoredRegisters + 8 * kPointerSize; 104 static const int kSecondaryReturnAddress = kReturnAddress + kPointerSize; 105 // Stack parameters placed by caller. 106 static const int kRegisterOutput = kSecondaryReturnAddress + kPointerSize; 107 static const int kNumOutputRegisters = kRegisterOutput + kPointerSize; 108 static const int kStackHighEnd = kNumOutputRegisters + kPointerSize; 109 static const int kDirectCall = kStackHighEnd + kPointerSize; 110 static const int kIsolate = kDirectCall + kPointerSize; 111 112 // Below the frame pointer. 113 // Register parameters stored by setup code. 114 static const int kInputEnd = kFramePointer - kPointerSize; 115 static const int kInputStart = kInputEnd - kPointerSize; 116 static const int kStartIndex = kInputStart - kPointerSize; 117 static const int kInputString = kStartIndex - kPointerSize; 118 // When adding local variables remember to push space for them in 119 // the frame in GetCode. 120 static const int kSuccessfulCaptures = kInputString - kPointerSize; 121 static const int kInputStartMinusOne = kSuccessfulCaptures - kPointerSize; 122 // First register address. Following registers are below it on the stack. 123 static const int kRegisterZero = kInputStartMinusOne - kPointerSize; 124 125 // Initial size of code buffer. 126 static const size_t kRegExpCodeSize = 1024; 127 128 static const int kBacktrackConstantPoolSize = 4; 129 130 // Load a number of characters at the given offset from the 131 // current position, into the current-character register. 132 void LoadCurrentCharacterUnchecked(int cp_offset, int character_count); 133 134 // Check whether preemption has been requested. 135 void CheckPreemption(); 136 137 // Check whether we are exceeding the stack limit on the backtrack stack. 138 void CheckStackLimit(); 139 140 141 // Generate a call to CheckStackGuardState. 142 void CallCheckStackGuardState(Register scratch); 143 144 // The ebp-relative location of a regexp register. 145 MemOperand register_location(int register_index); 146 147 // Register holding the current input position as negative offset from 148 // the end of the string. 149 inline Register current_input_offset() { return r6; } 150 151 // The register containing the current character after LoadCurrentCharacter. 152 inline Register current_character() { return r7; } 153 154 // Register holding address of the end of the input string. 155 inline Register end_of_input_address() { return r10; } 156 157 // Register holding the frame address. Local variables, parameters and 158 // regexp registers are addressed relative to this. 159 inline Register frame_pointer() { return fp; } 160 161 // The register containing the backtrack stack top. Provides a meaningful 162 // name to the register. 163 inline Register backtrack_stackpointer() { return r8; } 164 165 // Register holding pointer to the current code object. 166 inline Register code_pointer() { return r5; } 167 168 // Byte size of chars in the string to match (decided by the Mode argument) 169 inline int char_size() { return static_cast<int>(mode_); } 170 171 // Equivalent to a conditional branch to the label, unless the label 172 // is NULL, in which case it is a conditional Backtrack. 173 void BranchOrBacktrack(Condition condition, Label* to); 174 175 // Call and return internally in the generated code in a way that 176 // is GC-safe (i.e., doesn't leave absolute code addresses on the stack) 177 inline void SafeCall(Label* to, Condition cond = al); 178 inline void SafeReturn(); 179 inline void SafeCallTarget(Label* name); 180 181 // Pushes the value of a register on the backtrack stack. Decrements the 182 // stack pointer by a word size and stores the register's value there. 183 inline void Push(Register source); 184 185 // Pops a value from the backtrack stack. Reads the word at the stack pointer 186 // and increments it by a word size. 187 inline void Pop(Register target); 188 189 Isolate* isolate() const { return masm_->isolate(); } 190 191 MacroAssembler* masm_; 192 193 // Which mode to generate code for (Latin1 or UC16). 194 Mode mode_; 195 196 // One greater than maximal register index actually used. 197 int num_registers_; 198 199 // Number of registers to output at the end (the saved registers 200 // are always 0..num_saved_registers_-1) 201 int num_saved_registers_; 202 203 // Labels used internally. 204 Label entry_label_; 205 Label start_label_; 206 Label success_label_; 207 Label backtrack_label_; 208 Label exit_label_; 209 Label check_preempt_label_; 210 Label stack_overflow_label_; 211 }; 212 213 #endif // V8_INTERPRETED_REGEXP 214 215 216 }} // namespace v8::internal 217 218 #endif // V8_ARM_REGEXP_MACRO_ASSEMBLER_ARM_H_ 219
