1 // Copyright 2010 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 #ifndef V8_INTERPRETED_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<HeapObject> 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 SetCurrentPositionFromEnd(int by); 97 virtual void SetRegister(int register_index, int to); 98 virtual void Succeed(); 99 virtual void WriteCurrentPositionToRegister(int reg, int cp_offset); 100 virtual void ClearRegisters(int reg_from, int reg_to); 101 virtual void WriteStackPointerToRegister(int reg); 102 103 static Result Match(Handle<Code> regexp, 104 Handle<String> subject, 105 int* offsets_vector, 106 int offsets_vector_length, 107 int previous_index, 108 Isolate* isolate); 109 110 static Result Execute(Code* code, 111 String* input, 112 int start_offset, 113 const byte* input_start, 114 const byte* input_end, 115 int* output, 116 bool at_start); 117 118 // Called from RegExp if the stack-guard is triggered. 119 // If the code object is relocated, the return address is fixed before 120 // returning. 121 static int CheckStackGuardState(Address* return_address, 122 Code* re_code, 123 Address re_frame); 124 125 private: 126 // Offsets from rbp of function parameters and stored registers. 127 static const int kFramePointer = 0; 128 // Above the frame pointer - function parameters and return address. 129 static const int kReturn_eip = kFramePointer + kPointerSize; 130 static const int kFrameAlign = kReturn_eip + kPointerSize; 131 132 #ifdef _WIN64 133 // Parameters (first four passed as registers, but with room on stack). 134 // In Microsoft 64-bit Calling Convention, there is room on the callers 135 // stack (before the return address) to spill parameter registers. We 136 // use this space to store the register passed parameters. 137 static const int kInputString = kFrameAlign; 138 // StartIndex is passed as 32 bit int. 139 static const int kStartIndex = kInputString + kPointerSize; 140 static const int kInputStart = kStartIndex + kPointerSize; 141 static const int kInputEnd = kInputStart + kPointerSize; 142 static const int kRegisterOutput = kInputEnd + kPointerSize; 143 static const int kStackHighEnd = kRegisterOutput + kPointerSize; 144 // DirectCall is passed as 32 bit int (values 0 or 1). 145 static const int kDirectCall = kStackHighEnd + kPointerSize; 146 static const int kIsolate = kDirectCall + kPointerSize; 147 #else 148 // In AMD64 ABI Calling Convention, the first six integer parameters 149 // are passed as registers, and caller must allocate space on the stack 150 // if it wants them stored. We push the parameters after the frame pointer. 151 static const int kInputString = kFramePointer - kPointerSize; 152 static const int kStartIndex = kInputString - kPointerSize; 153 static const int kInputStart = kStartIndex - kPointerSize; 154 static const int kInputEnd = kInputStart - kPointerSize; 155 static const int kRegisterOutput = kInputEnd - kPointerSize; 156 static const int kStackHighEnd = kRegisterOutput - kPointerSize; 157 static const int kDirectCall = kFrameAlign; 158 static const int kIsolate = kDirectCall + kPointerSize; 159 #endif 160 161 #ifdef _WIN64 162 // Microsoft calling convention has three callee-saved registers 163 // (that we are using). We push these after the frame pointer. 164 static const int kBackup_rsi = kFramePointer - kPointerSize; 165 static const int kBackup_rdi = kBackup_rsi - kPointerSize; 166 static const int kBackup_rbx = kBackup_rdi - kPointerSize; 167 static const int kLastCalleeSaveRegister = kBackup_rbx; 168 #else 169 // AMD64 Calling Convention has only one callee-save register that 170 // we use. We push this after the frame pointer (and after the 171 // parameters). 172 static const int kBackup_rbx = kStackHighEnd - kPointerSize; 173 static const int kLastCalleeSaveRegister = kBackup_rbx; 174 #endif 175 176 // When adding local variables remember to push space for them in 177 // the frame in GetCode. 178 static const int kInputStartMinusOne = 179 kLastCalleeSaveRegister - kPointerSize; 180 181 // First register address. Following registers are below it on the stack. 182 static const int kRegisterZero = kInputStartMinusOne - kPointerSize; 183 184 // Initial size of code buffer. 185 static const size_t kRegExpCodeSize = 1024; 186 187 // Load a number of characters at the given offset from the 188 // current position, into the current-character register. 189 void LoadCurrentCharacterUnchecked(int cp_offset, int character_count); 190 191 // Check whether preemption has been requested. 192 void CheckPreemption(); 193 194 // Check whether we are exceeding the stack limit on the backtrack stack. 195 void CheckStackLimit(); 196 197 // Generate a call to CheckStackGuardState. 198 void CallCheckStackGuardState(); 199 200 // The rbp-relative location of a regexp register. 201 Operand register_location(int register_index); 202 203 // The register containing the current character after LoadCurrentCharacter. 204 inline Register current_character() { return rdx; } 205 206 // The register containing the backtrack stack top. Provides a meaningful 207 // name to the register. 208 inline Register backtrack_stackpointer() { return rcx; } 209 210 // The registers containing a self pointer to this code's Code object. 211 inline Register code_object_pointer() { return r8; } 212 213 // Byte size of chars in the string to match (decided by the Mode argument) 214 inline int char_size() { return static_cast<int>(mode_); } 215 216 // Equivalent to a conditional branch to the label, unless the label 217 // is NULL, in which case it is a conditional Backtrack. 218 void BranchOrBacktrack(Condition condition, Label* to); 219 220 void MarkPositionForCodeRelativeFixup() { 221 code_relative_fixup_positions_.Add(masm_.pc_offset()); 222 } 223 224 void FixupCodeRelativePositions(); 225 226 // Call and return internally in the generated code in a way that 227 // is GC-safe (i.e., doesn't leave absolute code addresses on the stack) 228 inline void SafeCall(Label* to); 229 inline void SafeCallTarget(Label* label); 230 inline void SafeReturn(); 231 232 // Pushes the value of a register on the backtrack stack. Decrements the 233 // stack pointer (rcx) by a word size and stores the register's value there. 234 inline void Push(Register source); 235 236 // Pushes a value on the backtrack stack. Decrements the stack pointer (rcx) 237 // by a word size and stores the value there. 238 inline void Push(Immediate value); 239 240 // Pushes the Code object relative offset of a label on the backtrack stack 241 // (i.e., a backtrack target). Decrements the stack pointer (rcx) 242 // by a word size and stores the value there. 243 inline void Push(Label* label); 244 245 // Pops a value from the backtrack stack. Reads the word at the stack pointer 246 // (rcx) and increments it by a word size. 247 inline void Pop(Register target); 248 249 // Drops the top value from the backtrack stack without reading it. 250 // Increments the stack pointer (rcx) by a word size. 251 inline void Drop(); 252 253 MacroAssembler masm_; 254 MacroAssembler::NoRootArrayScope no_root_array_scope_; 255 256 ZoneList<int> code_relative_fixup_positions_; 257 258 // Which mode to generate code for (ASCII or UC16). 259 Mode mode_; 260 261 // One greater than maximal register index actually used. 262 int num_registers_; 263 264 // Number of registers to output at the end (the saved registers 265 // are always 0..num_saved_registers_-1) 266 int num_saved_registers_; 267 268 // Labels used internally. 269 Label entry_label_; 270 Label start_label_; 271 Label success_label_; 272 Label backtrack_label_; 273 Label exit_label_; 274 Label check_preempt_label_; 275 Label stack_overflow_label_; 276 }; 277 278 #endif // V8_INTERPRETED_REGEXP 279 280 }} // namespace v8::internal 281 282 #endif // V8_X64_REGEXP_MACRO_ASSEMBLER_X64_H_ 283
