1 // Copyright 2006-2008 the V8 project authors. All rights reserved. 2 // Redistribution and use in source and binary forms, with or without 3 // modification, are permitted provided that the following conditions are 4 // met: 5 // 6 // * Redistributions of source code must retain the above copyright 7 // notice, this list of conditions and the following disclaimer. 8 // * Redistributions in binary form must reproduce the above 9 // copyright notice, this list of conditions and the following 10 // disclaimer in the documentation and/or other materials provided 11 // with the distribution. 12 // * Neither the name of Google Inc. nor the names of its 13 // contributors may be used to endorse or promote products derived 14 // from this software without specific prior written permission. 15 // 16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 28 #ifndef V8_ARM_REGEXP_MACRO_ASSEMBLER_ARM_H_ 29 #define V8_ARM_REGEXP_MACRO_ASSEMBLER_ARM_H_ 30 31 namespace v8 { 32 namespace internal { 33 34 35 #ifdef V8_INTERPRETED_REGEXP 36 class RegExpMacroAssemblerARM: public RegExpMacroAssembler { 37 public: 38 RegExpMacroAssemblerARM(); 39 virtual ~RegExpMacroAssemblerARM(); 40 }; 41 42 #else // V8_INTERPRETED_REGEXP 43 class RegExpMacroAssemblerARM: public NativeRegExpMacroAssembler { 44 public: 45 RegExpMacroAssemblerARM(Mode mode, int registers_to_save); 46 virtual ~RegExpMacroAssemblerARM(); 47 virtual int stack_limit_slack(); 48 virtual void AdvanceCurrentPosition(int by); 49 virtual void AdvanceRegister(int reg, int by); 50 virtual void Backtrack(); 51 virtual void Bind(Label* label); 52 virtual void CheckAtStart(Label* on_at_start); 53 virtual void CheckCharacter(unsigned c, Label* on_equal); 54 virtual void CheckCharacterAfterAnd(unsigned c, 55 unsigned mask, 56 Label* on_equal); 57 virtual void CheckCharacterGT(uc16 limit, Label* on_greater); 58 virtual void CheckCharacterLT(uc16 limit, Label* on_less); 59 virtual void CheckCharacters(Vector<const uc16> str, 60 int cp_offset, 61 Label* on_failure, 62 bool check_end_of_string); 63 // A "greedy loop" is a loop that is both greedy and with a simple 64 // body. It has a particularly simple implementation. 65 virtual void CheckGreedyLoop(Label* on_tos_equals_current_position); 66 virtual void CheckNotAtStart(Label* on_not_at_start); 67 virtual void CheckNotBackReference(int start_reg, Label* on_no_match); 68 virtual void CheckNotBackReferenceIgnoreCase(int start_reg, 69 Label* on_no_match); 70 virtual void CheckNotRegistersEqual(int reg1, int reg2, Label* on_not_equal); 71 virtual void CheckNotCharacter(unsigned c, Label* on_not_equal); 72 virtual void CheckNotCharacterAfterAnd(unsigned c, 73 unsigned mask, 74 Label* on_not_equal); 75 virtual void CheckNotCharacterAfterMinusAnd(uc16 c, 76 uc16 minus, 77 uc16 mask, 78 Label* on_not_equal); 79 // Checks whether the given offset from the current position is before 80 // the end of the string. 81 virtual void CheckPosition(int cp_offset, Label* on_outside_input); 82 virtual bool CheckSpecialCharacterClass(uc16 type, 83 Label* on_no_match); 84 virtual void Fail(); 85 virtual Handle<HeapObject> GetCode(Handle<String> source); 86 virtual void GoTo(Label* label); 87 virtual void IfRegisterGE(int reg, int comparand, Label* if_ge); 88 virtual void IfRegisterLT(int reg, int comparand, Label* if_lt); 89 virtual void IfRegisterEqPos(int reg, Label* if_eq); 90 virtual IrregexpImplementation Implementation(); 91 virtual void LoadCurrentCharacter(int cp_offset, 92 Label* on_end_of_input, 93 bool check_bounds = true, 94 int characters = 1); 95 virtual void PopCurrentPosition(); 96 virtual void PopRegister(int register_index); 97 virtual void PushBacktrack(Label* label); 98 virtual void PushCurrentPosition(); 99 virtual void PushRegister(int register_index, 100 StackCheckFlag check_stack_limit); 101 virtual void ReadCurrentPositionFromRegister(int reg); 102 virtual void ReadStackPointerFromRegister(int reg); 103 virtual void SetCurrentPositionFromEnd(int by); 104 virtual void SetRegister(int register_index, int to); 105 virtual void Succeed(); 106 virtual void WriteCurrentPositionToRegister(int reg, int cp_offset); 107 virtual void ClearRegisters(int reg_from, int reg_to); 108 virtual void WriteStackPointerToRegister(int reg); 109 110 // Called from RegExp if the stack-guard is triggered. 111 // If the code object is relocated, the return address is fixed before 112 // returning. 113 static int CheckStackGuardState(Address* return_address, 114 Code* re_code, 115 Address re_frame); 116 private: 117 // Offsets from frame_pointer() of function parameters and stored registers. 118 static const int kFramePointer = 0; 119 120 // Above the frame pointer - Stored registers and stack passed parameters. 121 // Register 4..11. 122 static const int kStoredRegisters = kFramePointer; 123 // Return address (stored from link register, read into pc on return). 124 static const int kReturnAddress = kStoredRegisters + 8 * kPointerSize; 125 static const int kSecondaryReturnAddress = kReturnAddress + kPointerSize; 126 // Stack parameters placed by caller. 127 static const int kRegisterOutput = kSecondaryReturnAddress + kPointerSize; 128 static const int kStackHighEnd = kRegisterOutput + kPointerSize; 129 static const int kDirectCall = kStackHighEnd + kPointerSize; 130 static const int kIsolate = kDirectCall + kPointerSize; 131 132 // Below the frame pointer. 133 // Register parameters stored by setup code. 134 static const int kInputEnd = kFramePointer - kPointerSize; 135 static const int kInputStart = kInputEnd - kPointerSize; 136 static const int kStartIndex = kInputStart - kPointerSize; 137 static const int kInputString = kStartIndex - kPointerSize; 138 // When adding local variables remember to push space for them in 139 // the frame in GetCode. 140 static const int kInputStartMinusOne = kInputString - kPointerSize; 141 static const int kAtStart = kInputStartMinusOne - kPointerSize; 142 // First register address. Following registers are below it on the stack. 143 static const int kRegisterZero = kAtStart - kPointerSize; 144 145 // Initial size of code buffer. 146 static const size_t kRegExpCodeSize = 1024; 147 148 static const int kBacktrackConstantPoolSize = 4; 149 150 // Load a number of characters at the given offset from the 151 // current position, into the current-character register. 152 void LoadCurrentCharacterUnchecked(int cp_offset, int character_count); 153 154 // Check whether preemption has been requested. 155 void CheckPreemption(); 156 157 // Check whether we are exceeding the stack limit on the backtrack stack. 158 void CheckStackLimit(); 159 160 void EmitBacktrackConstantPool(); 161 int GetBacktrackConstantPoolEntry(); 162 163 164 // Generate a call to CheckStackGuardState. 165 void CallCheckStackGuardState(Register scratch); 166 167 // The ebp-relative location of a regexp register. 168 MemOperand register_location(int register_index); 169 170 // Register holding the current input position as negative offset from 171 // the end of the string. 172 inline Register current_input_offset() { return r6; } 173 174 // The register containing the current character after LoadCurrentCharacter. 175 inline Register current_character() { return r7; } 176 177 // Register holding address of the end of the input string. 178 inline Register end_of_input_address() { return r10; } 179 180 // Register holding the frame address. Local variables, parameters and 181 // regexp registers are addressed relative to this. 182 inline Register frame_pointer() { return fp; } 183 184 // The register containing the backtrack stack top. Provides a meaningful 185 // name to the register. 186 inline Register backtrack_stackpointer() { return r8; } 187 188 // Register holding pointer to the current code object. 189 inline Register code_pointer() { return r5; } 190 191 // Byte size of chars in the string to match (decided by the Mode argument) 192 inline int char_size() { return static_cast<int>(mode_); } 193 194 // Equivalent to a conditional branch to the label, unless the label 195 // is NULL, in which case it is a conditional Backtrack. 196 void BranchOrBacktrack(Condition condition, Label* to); 197 198 // Call and return internally in the generated code in a way that 199 // is GC-safe (i.e., doesn't leave absolute code addresses on the stack) 200 inline void SafeCall(Label* to, Condition cond = al); 201 inline void SafeReturn(); 202 inline void SafeCallTarget(Label* name); 203 204 // Pushes the value of a register on the backtrack stack. Decrements the 205 // stack pointer by a word size and stores the register's value there. 206 inline void Push(Register source); 207 208 // Pops a value from the backtrack stack. Reads the word at the stack pointer 209 // and increments it by a word size. 210 inline void Pop(Register target); 211 212 // Calls a C function and cleans up the frame alignment done by 213 // by FrameAlign. The called function *is* allowed to trigger a garbage 214 // collection, but may not take more than four arguments (no arguments 215 // passed on the stack), and the first argument will be a pointer to the 216 // return address. 217 inline void CallCFunctionUsingStub(ExternalReference function, 218 int num_arguments); 219 220 221 MacroAssembler* masm_; 222 223 // Which mode to generate code for (ASCII or UC16). 224 Mode mode_; 225 226 // One greater than maximal register index actually used. 227 int num_registers_; 228 229 // Number of registers to output at the end (the saved registers 230 // are always 0..num_saved_registers_-1) 231 int num_saved_registers_; 232 233 // Manage a small pre-allocated pool for writing label targets 234 // to for pushing backtrack addresses. 235 int backtrack_constant_pool_offset_; 236 int backtrack_constant_pool_capacity_; 237 238 // Labels used internally. 239 Label entry_label_; 240 Label start_label_; 241 Label success_label_; 242 Label backtrack_label_; 243 Label exit_label_; 244 Label check_preempt_label_; 245 Label stack_overflow_label_; 246 }; 247 248 #endif // V8_INTERPRETED_REGEXP 249 250 251 }} // namespace v8::internal 252 253 #endif // V8_ARM_REGEXP_MACRO_ASSEMBLER_ARM_H_ 254
