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_ARM_REGEXP_MACRO_ASSEMBLER_ARM_H_ 6 #define V8_REGEXP_ARM_REGEXP_MACRO_ASSEMBLER_ARM_H_ 7 8 #include "src/arm/assembler-arm.h" 9 #include "src/macro-assembler.h" 10 #include "src/regexp/regexp-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(Isolate* isolate, Zone* zone, Mode mode, 20 int registers_to_save); 21 virtual ~RegExpMacroAssemblerARM(); 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(unsigned c, Label* on_equal); 29 virtual void CheckCharacterAfterAnd(unsigned c, 30 unsigned 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(int cp_offset, Label* on_not_at_start); 38 virtual void CheckNotBackReference(int start_reg, bool read_backward, 39 Label* on_no_match); 40 virtual void CheckNotBackReferenceIgnoreCase(int start_reg, 41 bool read_backward, 42 Label* on_no_match); 43 virtual void CheckNotCharacter(unsigned c, Label* on_not_equal); 44 virtual void CheckNotCharacterAfterAnd(unsigned c, 45 unsigned mask, 46 Label* on_not_equal); 47 virtual void CheckNotCharacterAfterMinusAnd(uc16 c, 48 uc16 minus, 49 uc16 mask, 50 Label* on_not_equal); 51 virtual void CheckCharacterInRange(uc16 from, 52 uc16 to, 53 Label* on_in_range); 54 virtual void CheckCharacterNotInRange(uc16 from, 55 uc16 to, 56 Label* on_not_in_range); 57 virtual void CheckBitInTable(Handle<ByteArray> table, Label* on_bit_set); 58 59 // Checks whether the given offset from the current position is before 60 // the end of the string. 61 virtual void CheckPosition(int cp_offset, Label* on_outside_input); 62 virtual bool CheckSpecialCharacterClass(uc16 type, 63 Label* on_no_match); 64 virtual void Fail(); 65 virtual Handle<HeapObject> GetCode(Handle<String> source); 66 virtual void GoTo(Label* label); 67 virtual void IfRegisterGE(int reg, int comparand, Label* if_ge); 68 virtual void IfRegisterLT(int reg, int comparand, Label* if_lt); 69 virtual void IfRegisterEqPos(int reg, Label* if_eq); 70 virtual IrregexpImplementation Implementation(); 71 virtual void LoadCurrentCharacter(int cp_offset, 72 Label* on_end_of_input, 73 bool check_bounds = true, 74 int characters = 1); 75 virtual void PopCurrentPosition(); 76 virtual void PopRegister(int register_index); 77 virtual void PushBacktrack(Label* label); 78 virtual void PushCurrentPosition(); 79 virtual void PushRegister(int register_index, 80 StackCheckFlag check_stack_limit); 81 virtual void ReadCurrentPositionFromRegister(int reg); 82 virtual void ReadStackPointerFromRegister(int reg); 83 virtual void SetCurrentPositionFromEnd(int by); 84 virtual void SetRegister(int register_index, int to); 85 virtual bool Succeed(); 86 virtual void WriteCurrentPositionToRegister(int reg, int cp_offset); 87 virtual void ClearRegisters(int reg_from, int reg_to); 88 virtual void WriteStackPointerToRegister(int reg); 89 virtual bool CanReadUnaligned(); 90 91 // Called from RegExp if the stack-guard is triggered. 92 // If the code object is relocated, the return address is fixed before 93 // returning. 94 static int CheckStackGuardState(Address* return_address, 95 Code* re_code, 96 Address re_frame); 97 98 private: 99 // Offsets from frame_pointer() of function parameters and stored registers. 100 static const int kFramePointer = 0; 101 102 // Above the frame pointer - Stored registers and stack passed parameters. 103 // Register 4..11. 104 static const int kStoredRegisters = kFramePointer; 105 // Return address (stored from link register, read into pc on return). 106 static const int kReturnAddress = kStoredRegisters + 8 * kPointerSize; 107 static const int kSecondaryReturnAddress = kReturnAddress + kPointerSize; 108 // Stack parameters placed by caller. 109 static const int kRegisterOutput = kSecondaryReturnAddress + kPointerSize; 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; 114 115 // Below the frame pointer. 116 // Register parameters stored by setup code. 117 static const int kInputEnd = kFramePointer - kPointerSize; 118 static const int kInputStart = kInputEnd - kPointerSize; 119 static const int kStartIndex = kInputStart - kPointerSize; 120 static const int kInputString = kStartIndex - kPointerSize; 121 // When adding local variables remember to push space for them in 122 // the frame in GetCode. 123 static const int kSuccessfulCaptures = kInputString - kPointerSize; 124 static const int kStringStartMinusOne = kSuccessfulCaptures - kPointerSize; 125 // First register address. Following registers are below it on the stack. 126 static const int kRegisterZero = kStringStartMinusOne - kPointerSize; 127 128 // Initial size of code buffer. 129 static const size_t kRegExpCodeSize = 1024; 130 131 static const int kBacktrackConstantPoolSize = 4; 132 133 // Load a number of characters at the given offset from the 134 // current position, into the current-character register. 135 void LoadCurrentCharacterUnchecked(int cp_offset, int character_count); 136 137 // Check whether preemption has been requested. 138 void CheckPreemption(); 139 140 // Check whether we are exceeding the stack limit on the backtrack stack. 141 void CheckStackLimit(); 142 143 144 // Generate a call to CheckStackGuardState. 145 void CallCheckStackGuardState(Register scratch); 146 147 // The ebp-relative location of a regexp register. 148 MemOperand register_location(int register_index); 149 150 // Register holding the current input position as negative offset from 151 // the end of the string. 152 inline Register current_input_offset() { return r6; } 153 154 // The register containing the current character after LoadCurrentCharacter. 155 inline Register current_character() { return r7; } 156 157 // Register holding address of the end of the input string. 158 inline Register end_of_input_address() { return r10; } 159 160 // Register holding the frame address. Local variables, parameters and 161 // regexp registers are addressed relative to this. 162 inline Register frame_pointer() { return fp; } 163 164 // The register containing the backtrack stack top. Provides a meaningful 165 // name to the register. 166 inline Register backtrack_stackpointer() { return r8; } 167 168 // Register holding pointer to the current code object. 169 inline Register code_pointer() { return r5; } 170 171 // Byte size of chars in the string to match (decided by the Mode argument) 172 inline int char_size() { return static_cast<int>(mode_); } 173 174 // Equivalent to a conditional branch to the label, unless the label 175 // is NULL, in which case it is a conditional Backtrack. 176 void BranchOrBacktrack(Condition condition, Label* to); 177 178 // Call and return internally in the generated code in a way that 179 // is GC-safe (i.e., doesn't leave absolute code addresses on the stack) 180 inline void SafeCall(Label* to, Condition cond = al); 181 inline void SafeReturn(); 182 inline void SafeCallTarget(Label* name); 183 184 // Pushes the value of a register on the backtrack stack. Decrements the 185 // stack pointer by a word size and stores the register's value there. 186 inline void Push(Register source); 187 188 // Pops a value from the backtrack stack. Reads the word at the stack pointer 189 // and increments it by a word size. 190 inline void Pop(Register target); 191 192 Isolate* isolate() const { return masm_->isolate(); } 193 194 MacroAssembler* masm_; 195 196 // Which mode to generate code for (Latin1 or UC16). 197 Mode mode_; 198 199 // One greater than maximal register index actually used. 200 int num_registers_; 201 202 // Number of registers to output at the end (the saved registers 203 // are always 0..num_saved_registers_-1) 204 int num_saved_registers_; 205 206 // Labels used internally. 207 Label entry_label_; 208 Label start_label_; 209 Label success_label_; 210 Label backtrack_label_; 211 Label exit_label_; 212 Label check_preempt_label_; 213 Label stack_overflow_label_; 214 }; 215 216 #endif // V8_INTERPRETED_REGEXP 217 218 219 } // namespace internal 220 } // namespace v8 221 222 #endif // V8_REGEXP_ARM_REGEXP_MACRO_ASSEMBLER_ARM_H_ 223
