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/codegen/arm/assembler-arm.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 RegExpMacroAssemblerARM 16 : public NativeRegExpMacroAssembler { 17 public: 18 RegExpMacroAssemblerARM(Isolate* isolate, Zone* zone, Mode mode, 19 int registers_to_save); 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(int cp_offset, 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(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(unsigned c, Label* on_not_equal); 43 virtual void CheckNotCharacterAfterAnd(unsigned c, 44 unsigned 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 LoadCurrentCharacterUnchecked(int cp_offset, 71 int character_count); 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 87 // Called from RegExp if the stack-guard is triggered. 88 // If the code object is relocated, the return address is fixed before 89 // returning. 90 // {raw_code} is an Address because this is called via ExternalReference. 91 static int CheckStackGuardState(Address* return_address, Address raw_code, 92 Address re_frame); 93 94 private: 95 // Offsets from frame_pointer() of function parameters and stored registers. 96 static const int kFramePointer = 0; 97 98 // Above the frame pointer - Stored registers and stack passed parameters. 99 // Register 4..11. 100 static const int kStoredRegisters = kFramePointer; 101 // Return address (stored from link register, read into pc on return). 102 static const int kReturnAddress = kStoredRegisters + 8 * kPointerSize; 103 // Stack parameters placed by caller. 104 static const int kRegisterOutput = kReturnAddress + kPointerSize; 105 static const int kNumOutputRegisters = kRegisterOutput + kPointerSize; 106 static const int kStackHighEnd = kNumOutputRegisters + kPointerSize; 107 static const int kDirectCall = kStackHighEnd + kPointerSize; 108 static const int kIsolate = kDirectCall + kPointerSize; 109 110 // Below the frame pointer. 111 // Register parameters stored by setup code. 112 static const int kInputEnd = kFramePointer - kPointerSize; 113 static const int kInputStart = kInputEnd - kPointerSize; 114 static const int kStartIndex = kInputStart - kPointerSize; 115 static const int kInputString = kStartIndex - kPointerSize; 116 // When adding local variables remember to push space for them in 117 // the frame in GetCode. 118 static const int kSuccessfulCaptures = kInputString - kPointerSize; 119 static const int kStringStartMinusOne = kSuccessfulCaptures - kPointerSize; 120 static const int kBacktrackCount = kStringStartMinusOne - kSystemPointerSize; 121 // First register address. Following registers are below it on the stack. 122 static const int kRegisterZero = kBacktrackCount - kSystemPointerSize; 123 124 // Initial size of code buffer. 125 static const int kRegExpCodeSize = 1024; 126 127 static const int kBacktrackConstantPoolSize = 4; 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(); 134 135 136 // Generate a call to CheckStackGuardState. 137 void CallCheckStackGuardState(); 138 139 // The ebp-relative location of a regexp register. 140 MemOperand register_location(int register_index); 141 142 // Register holding the current input position as negative offset from 143 // the end of the string. current_input_offset()144 inline Register current_input_offset() { return r6; } 145 146 // The register containing the current character after LoadCurrentCharacter. current_character()147 inline Register current_character() { return r7; } 148 149 // Register holding address of the end of the input string. end_of_input_address()150 inline Register end_of_input_address() { return r10; } 151 152 // Register holding the frame address. Local variables, parameters and 153 // regexp registers are addressed relative to this. frame_pointer()154 inline Register frame_pointer() { return fp; } 155 156 // The register containing the backtrack stack top. Provides a meaningful 157 // name to the register. backtrack_stackpointer()158 inline Register backtrack_stackpointer() { return r8; } 159 160 // Register holding pointer to the current code object. code_pointer()161 inline Register code_pointer() { return r5; } 162 163 // Byte size of chars in the string to match (decided by the Mode argument) char_size()164 inline int char_size() { return static_cast<int>(mode_); } 165 166 // Equivalent to a conditional branch to the label, unless the label 167 // is nullptr, in which case it is a conditional Backtrack. 168 void BranchOrBacktrack(Condition condition, Label* to); 169 170 // Call and return internally in the generated code in a way that 171 // is GC-safe (i.e., doesn't leave absolute code addresses on the stack) 172 inline void SafeCall(Label* to, Condition cond = al); 173 inline void SafeReturn(); 174 inline void SafeCallTarget(Label* name); 175 176 // Pushes the value of a register on the backtrack stack. Decrements the 177 // stack pointer by a word size and stores the register's value there. 178 inline void Push(Register source); 179 180 // Pops a value from the backtrack stack. Reads the word at the stack pointer 181 // and increments it by a word size. 182 inline void Pop(Register target); 183 isolate()184 Isolate* isolate() const { return masm_->isolate(); } 185 186 MacroAssembler* masm_; 187 188 // Which mode to generate code for (Latin1 or UC16). 189 Mode mode_; 190 191 // One greater than maximal register index actually used. 192 int num_registers_; 193 194 // Number of registers to output at the end (the saved registers 195 // are always 0..num_saved_registers_-1) 196 int num_saved_registers_; 197 198 // Labels used internally. 199 Label entry_label_; 200 Label start_label_; 201 Label success_label_; 202 Label backtrack_label_; 203 Label exit_label_; 204 Label check_preempt_label_; 205 Label stack_overflow_label_; 206 Label fallback_label_; 207 }; 208 209 } // namespace internal 210 } // namespace v8 211 212 #endif // V8_REGEXP_ARM_REGEXP_MACRO_ASSEMBLER_ARM_H_ 213