1 // Copyright 2009 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_X64_REGEXP_MACRO_ASSEMBLER_X64_H_ 29 #define V8_X64_REGEXP_MACRO_ASSEMBLER_X64_H_ 30 31 namespace v8 { 32 namespace internal { 33 34 #ifdef V8_NATIVE_REGEXP 35 36 class RegExpMacroAssemblerX64: public NativeRegExpMacroAssembler { 37 public: 38 RegExpMacroAssemblerX64(Mode mode, int registers_to_save); 39 virtual ~RegExpMacroAssemblerX64(); 40 virtual int stack_limit_slack(); 41 virtual void AdvanceCurrentPosition(int by); 42 virtual void AdvanceRegister(int reg, int by); 43 virtual void Backtrack(); 44 virtual void Bind(Label* label); 45 virtual void CheckAtStart(Label* on_at_start); 46 virtual void CheckCharacter(uint32_t c, Label* on_equal); 47 virtual void CheckCharacterAfterAnd(uint32_t c, 48 uint32_t mask, 49 Label* on_equal); 50 virtual void CheckCharacterGT(uc16 limit, Label* on_greater); 51 virtual void CheckCharacterLT(uc16 limit, Label* on_less); 52 virtual void CheckCharacters(Vector<const uc16> str, 53 int cp_offset, 54 Label* on_failure, 55 bool check_end_of_string); 56 // A "greedy loop" is a loop that is both greedy and with a simple 57 // body. It has a particularly simple implementation. 58 virtual void CheckGreedyLoop(Label* on_tos_equals_current_position); 59 virtual void CheckNotAtStart(Label* on_not_at_start); 60 virtual void CheckNotBackReference(int start_reg, Label* on_no_match); 61 virtual void CheckNotBackReferenceIgnoreCase(int start_reg, 62 Label* on_no_match); 63 virtual void CheckNotRegistersEqual(int reg1, int reg2, Label* on_not_equal); 64 virtual void CheckNotCharacter(uint32_t c, Label* on_not_equal); 65 virtual void CheckNotCharacterAfterAnd(uint32_t c, 66 uint32_t mask, 67 Label* on_not_equal); 68 virtual void CheckNotCharacterAfterMinusAnd(uc16 c, 69 uc16 minus, 70 uc16 mask, 71 Label* on_not_equal); 72 // Checks whether the given offset from the current position is before 73 // the end of the string. 74 virtual void CheckPosition(int cp_offset, Label* on_outside_input); 75 virtual bool CheckSpecialCharacterClass(uc16 type, 76 Label* on_no_match); 77 virtual void Fail(); 78 virtual Handle<Object> GetCode(Handle<String> source); 79 virtual void GoTo(Label* label); 80 virtual void IfRegisterGE(int reg, int comparand, Label* if_ge); 81 virtual void IfRegisterLT(int reg, int comparand, Label* if_lt); 82 virtual void IfRegisterEqPos(int reg, Label* if_eq); 83 virtual IrregexpImplementation Implementation(); 84 virtual void LoadCurrentCharacter(int cp_offset, 85 Label* on_end_of_input, 86 bool check_bounds = true, 87 int characters = 1); 88 virtual void PopCurrentPosition(); 89 virtual void PopRegister(int register_index); 90 virtual void PushBacktrack(Label* label); 91 virtual void PushCurrentPosition(); 92 virtual void PushRegister(int register_index, 93 StackCheckFlag check_stack_limit); 94 virtual void ReadCurrentPositionFromRegister(int reg); 95 virtual void ReadStackPointerFromRegister(int reg); 96 virtual void SetRegister(int register_index, int to); 97 virtual void Succeed(); 98 virtual void WriteCurrentPositionToRegister(int reg, int cp_offset); 99 virtual void ClearRegisters(int reg_from, int reg_to); 100 virtual void WriteStackPointerToRegister(int reg); 101 102 static Result Match(Handle<Code> regexp, 103 Handle<String> subject, 104 int* offsets_vector, 105 int offsets_vector_length, 106 int previous_index); 107 108 static Result Execute(Code* code, 109 String* input, 110 int start_offset, 111 const byte* input_start, 112 const byte* input_end, 113 int* output, 114 bool at_start); 115 116 // Called from RegExp if the stack-guard is triggered. 117 // If the code object is relocated, the return address is fixed before 118 // returning. 119 static int CheckStackGuardState(Address* return_address, 120 Code* re_code, 121 Address re_frame); 122 123 private: 124 // Offsets from rbp of function parameters and stored registers. 125 static const int kFramePointer = 0; 126 // Above the frame pointer - function parameters and return address. 127 static const int kReturn_eip = kFramePointer + kPointerSize; 128 static const int kFrameAlign = kReturn_eip + kPointerSize; 129 130 #ifdef _WIN64 131 // Parameters (first four passed as registers, but with room on stack). 132 // In Microsoft 64-bit Calling Convention, there is room on the callers 133 // stack (before the return address) to spill parameter registers. We 134 // use this space to store the register passed parameters. 135 static const int kInputString = kFrameAlign; 136 // StartIndex is passed as 32 bit int. 137 static const int kStartIndex = kInputString + kPointerSize; 138 static const int kInputStart = kStartIndex + kPointerSize; 139 static const int kInputEnd = kInputStart + kPointerSize; 140 static const int kRegisterOutput = kInputEnd + kPointerSize; 141 static const int kStackHighEnd = kRegisterOutput + kPointerSize; 142 // DirectCall is passed as 32 bit int (values 0 or 1). 143 static const int kDirectCall = kStackHighEnd + kPointerSize; 144 #else 145 // In AMD64 ABI Calling Convention, the first six integer parameters 146 // are passed as registers, and caller must allocate space on the stack 147 // if it wants them stored. We push the parameters after the frame pointer. 148 static const int kInputString = kFramePointer - kPointerSize; 149 static const int kStartIndex = kInputString - kPointerSize; 150 static const int kInputStart = kStartIndex - kPointerSize; 151 static const int kInputEnd = kInputStart - kPointerSize; 152 static const int kRegisterOutput = kInputEnd - kPointerSize; 153 static const int kStackHighEnd = kRegisterOutput - kPointerSize; 154 static const int kDirectCall = kFrameAlign; 155 #endif 156 157 #ifdef _WIN64 158 // Microsoft calling convention has three callee-saved registers 159 // (that we are using). We push these after the frame pointer. 160 static const int kBackup_rsi = kFramePointer - kPointerSize; 161 static const int kBackup_rdi = kBackup_rsi - kPointerSize; 162 static const int kBackup_rbx = kBackup_rdi - kPointerSize; 163 static const int kLastCalleeSaveRegister = kBackup_rbx; 164 #else 165 // AMD64 Calling Convention has only one callee-save register that 166 // we use. We push this after the frame pointer (and after the 167 // parameters). 168 static const int kBackup_rbx = kStackHighEnd - kPointerSize; 169 static const int kLastCalleeSaveRegister = kBackup_rbx; 170 #endif 171 172 // When adding local variables remember to push space for them in 173 // the frame in GetCode. 174 static const int kInputStartMinusOne = 175 kLastCalleeSaveRegister - kPointerSize; 176 static const int kAtStart = kInputStartMinusOne - kPointerSize; 177 178 // First register address. Following registers are below it on the stack. 179 static const int kRegisterZero = kAtStart - kPointerSize; 180 181 // Initial size of code buffer. 182 static const size_t kRegExpCodeSize = 1024; 183 184 // Load a number of characters at the given offset from the 185 // current position, into the current-character register. 186 void LoadCurrentCharacterUnchecked(int cp_offset, int character_count); 187 188 // Check whether preemption has been requested. 189 void CheckPreemption(); 190 191 // Check whether we are exceeding the stack limit on the backtrack stack. 192 void CheckStackLimit(); 193 194 // Generate a call to CheckStackGuardState. 195 void CallCheckStackGuardState(); 196 197 // The rbp-relative location of a regexp register. 198 Operand register_location(int register_index); 199 200 // The register containing the current character after LoadCurrentCharacter. 201 inline Register current_character() { return rdx; } 202 203 // The register containing the backtrack stack top. Provides a meaningful 204 // name to the register. 205 inline Register backtrack_stackpointer() { return rcx; } 206 207 // The registers containing a self pointer to this code's Code object. 208 inline Register code_object_pointer() { return r8; } 209 210 // Byte size of chars in the string to match (decided by the Mode argument) 211 inline int char_size() { return static_cast<int>(mode_); } 212 213 // Equivalent to a conditional branch to the label, unless the label 214 // is NULL, in which case it is a conditional Backtrack. 215 void BranchOrBacktrack(Condition condition, Label* to); 216 217 void MarkPositionForCodeRelativeFixup() { 218 code_relative_fixup_positions_.Add(masm_->pc_offset()); 219 } 220 221 void FixupCodeRelativePositions(); 222 223 // Call and return internally in the generated code in a way that 224 // is GC-safe (i.e., doesn't leave absolute code addresses on the stack) 225 inline void SafeCall(Label* to); 226 inline void SafeCallTarget(Label* label); 227 inline void SafeReturn(); 228 229 // Pushes the value of a register on the backtrack stack. Decrements the 230 // stack pointer (rcx) by a word size and stores the register's value there. 231 inline void Push(Register source); 232 233 // Pushes a value on the backtrack stack. Decrements the stack pointer (rcx) 234 // by a word size and stores the value there. 235 inline void Push(Immediate value); 236 237 // Pushes the Code object relative offset of a label on the backtrack stack 238 // (i.e., a backtrack target). Decrements the stack pointer (rcx) 239 // by a word size and stores the value there. 240 inline void Push(Label* label); 241 242 // Pops a value from the backtrack stack. Reads the word at the stack pointer 243 // (rcx) and increments it by a word size. 244 inline void Pop(Register target); 245 246 // Drops the top value from the backtrack stack without reading it. 247 // Increments the stack pointer (rcx) by a word size. 248 inline void Drop(); 249 250 MacroAssembler* masm_; 251 252 ZoneList<int> code_relative_fixup_positions_; 253 254 // Which mode to generate code for (ASCII or UC16). 255 Mode mode_; 256 257 // One greater than maximal register index actually used. 258 int num_registers_; 259 260 // Number of registers to output at the end (the saved registers 261 // are always 0..num_saved_registers_-1) 262 int num_saved_registers_; 263 264 // Labels used internally. 265 Label entry_label_; 266 Label start_label_; 267 Label success_label_; 268 Label backtrack_label_; 269 Label exit_label_; 270 Label check_preempt_label_; 271 Label stack_overflow_label_; 272 }; 273 274 #endif // V8_NATIVE_REGEXP 275 276 }} // namespace v8::internal 277 278 #endif // V8_X64_REGEXP_MACRO_ASSEMBLER_X64_H_ 279