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 #include "x64/assembler-x64.h" 32 #include "x64/assembler-x64-inl.h" 33 #include "macro-assembler.h" 34 #include "code.h" 35 #include "x64/macro-assembler-x64.h" 36 37 namespace v8 { 38 namespace internal { 39 40 #ifndef V8_INTERPRETED_REGEXP 41 42 class RegExpMacroAssemblerX64: public NativeRegExpMacroAssembler { 43 public: 44 RegExpMacroAssemblerX64(Mode mode, int registers_to_save); 45 virtual ~RegExpMacroAssemblerX64(); 46 virtual int stack_limit_slack(); 47 virtual void AdvanceCurrentPosition(int by); 48 virtual void AdvanceRegister(int reg, int by); 49 virtual void Backtrack(); 50 virtual void Bind(Label* label); 51 virtual void CheckAtStart(Label* on_at_start); 52 virtual void CheckCharacter(uint32_t c, Label* on_equal); 53 virtual void CheckCharacterAfterAnd(uint32_t c, 54 uint32_t mask, 55 Label* on_equal); 56 virtual void CheckCharacterGT(uc16 limit, Label* on_greater); 57 virtual void CheckCharacterLT(uc16 limit, Label* on_less); 58 virtual void CheckCharacters(Vector<const uc16> str, 59 int cp_offset, 60 Label* on_failure, 61 bool check_end_of_string); 62 // A "greedy loop" is a loop that is both greedy and with a simple 63 // body. It has a particularly simple implementation. 64 virtual void CheckGreedyLoop(Label* on_tos_equals_current_position); 65 virtual void CheckNotAtStart(Label* on_not_at_start); 66 virtual void CheckNotBackReference(int start_reg, Label* on_no_match); 67 virtual void CheckNotBackReferenceIgnoreCase(int start_reg, 68 Label* on_no_match); 69 virtual void CheckNotRegistersEqual(int reg1, int reg2, Label* on_not_equal); 70 virtual void CheckNotCharacter(uint32_t c, Label* on_not_equal); 71 virtual void CheckNotCharacterAfterAnd(uint32_t c, 72 uint32_t mask, 73 Label* on_not_equal); 74 virtual void CheckNotCharacterAfterMinusAnd(uc16 c, 75 uc16 minus, 76 uc16 mask, 77 Label* on_not_equal); 78 // Checks whether the given offset from the current position is before 79 // the end of the string. 80 virtual void CheckPosition(int cp_offset, Label* on_outside_input); 81 virtual bool CheckSpecialCharacterClass(uc16 type, 82 Label* on_no_match); 83 virtual void Fail(); 84 virtual Handle<HeapObject> GetCode(Handle<String> source); 85 virtual void GoTo(Label* label); 86 virtual void IfRegisterGE(int reg, int comparand, Label* if_ge); 87 virtual void IfRegisterLT(int reg, int comparand, Label* if_lt); 88 virtual void IfRegisterEqPos(int reg, Label* if_eq); 89 virtual IrregexpImplementation Implementation(); 90 virtual void LoadCurrentCharacter(int cp_offset, 91 Label* on_end_of_input, 92 bool check_bounds = true, 93 int characters = 1); 94 virtual void PopCurrentPosition(); 95 virtual void PopRegister(int register_index); 96 virtual void PushBacktrack(Label* label); 97 virtual void PushCurrentPosition(); 98 virtual void PushRegister(int register_index, 99 StackCheckFlag check_stack_limit); 100 virtual void ReadCurrentPositionFromRegister(int reg); 101 virtual void ReadStackPointerFromRegister(int reg); 102 virtual void SetCurrentPositionFromEnd(int by); 103 virtual void SetRegister(int register_index, int to); 104 virtual void Succeed(); 105 virtual void WriteCurrentPositionToRegister(int reg, int cp_offset); 106 virtual void ClearRegisters(int reg_from, int reg_to); 107 virtual void WriteStackPointerToRegister(int reg); 108 109 static Result Match(Handle<Code> regexp, 110 Handle<String> subject, 111 int* offsets_vector, 112 int offsets_vector_length, 113 int previous_index, 114 Isolate* isolate); 115 116 static Result Execute(Code* code, 117 String* input, 118 int start_offset, 119 const byte* input_start, 120 const byte* input_end, 121 int* output, 122 bool at_start); 123 124 // Called from RegExp if the stack-guard is triggered. 125 // If the code object is relocated, the return address is fixed before 126 // returning. 127 static int CheckStackGuardState(Address* return_address, 128 Code* re_code, 129 Address re_frame); 130 131 private: 132 // Offsets from rbp of function parameters and stored registers. 133 static const int kFramePointer = 0; 134 // Above the frame pointer - function parameters and return address. 135 static const int kReturn_eip = kFramePointer + kPointerSize; 136 static const int kFrameAlign = kReturn_eip + kPointerSize; 137 138 #ifdef _WIN64 139 // Parameters (first four passed as registers, but with room on stack). 140 // In Microsoft 64-bit Calling Convention, there is room on the callers 141 // stack (before the return address) to spill parameter registers. We 142 // use this space to store the register passed parameters. 143 static const int kInputString = kFrameAlign; 144 // StartIndex is passed as 32 bit int. 145 static const int kStartIndex = kInputString + kPointerSize; 146 static const int kInputStart = kStartIndex + kPointerSize; 147 static const int kInputEnd = kInputStart + kPointerSize; 148 static const int kRegisterOutput = kInputEnd + kPointerSize; 149 static const int kStackHighEnd = kRegisterOutput + kPointerSize; 150 // DirectCall is passed as 32 bit int (values 0 or 1). 151 static const int kDirectCall = kStackHighEnd + kPointerSize; 152 static const int kIsolate = kDirectCall + kPointerSize; 153 #else 154 // In AMD64 ABI Calling Convention, the first six integer parameters 155 // are passed as registers, and caller must allocate space on the stack 156 // if it wants them stored. We push the parameters after the frame pointer. 157 static const int kInputString = kFramePointer - kPointerSize; 158 static const int kStartIndex = kInputString - kPointerSize; 159 static const int kInputStart = kStartIndex - kPointerSize; 160 static const int kInputEnd = kInputStart - kPointerSize; 161 static const int kRegisterOutput = kInputEnd - kPointerSize; 162 static const int kStackHighEnd = kRegisterOutput - kPointerSize; 163 static const int kDirectCall = kFrameAlign; 164 static const int kIsolate = kDirectCall + kPointerSize; 165 #endif 166 167 #ifdef _WIN64 168 // Microsoft calling convention has three callee-saved registers 169 // (that we are using). We push these after the frame pointer. 170 static const int kBackup_rsi = kFramePointer - kPointerSize; 171 static const int kBackup_rdi = kBackup_rsi - kPointerSize; 172 static const int kBackup_rbx = kBackup_rdi - kPointerSize; 173 static const int kLastCalleeSaveRegister = kBackup_rbx; 174 #else 175 // AMD64 Calling Convention has only one callee-save register that 176 // we use. We push this after the frame pointer (and after the 177 // parameters). 178 static const int kBackup_rbx = kStackHighEnd - kPointerSize; 179 static const int kLastCalleeSaveRegister = kBackup_rbx; 180 #endif 181 182 // When adding local variables remember to push space for them in 183 // the frame in GetCode. 184 static const int kInputStartMinusOne = 185 kLastCalleeSaveRegister - kPointerSize; 186 187 // First register address. Following registers are below it on the stack. 188 static const int kRegisterZero = kInputStartMinusOne - kPointerSize; 189 190 // Initial size of code buffer. 191 static const size_t kRegExpCodeSize = 1024; 192 193 // Load a number of characters at the given offset from the 194 // current position, into the current-character register. 195 void LoadCurrentCharacterUnchecked(int cp_offset, int character_count); 196 197 // Check whether preemption has been requested. 198 void CheckPreemption(); 199 200 // Check whether we are exceeding the stack limit on the backtrack stack. 201 void CheckStackLimit(); 202 203 // Generate a call to CheckStackGuardState. 204 void CallCheckStackGuardState(); 205 206 // The rbp-relative location of a regexp register. 207 Operand register_location(int register_index); 208 209 // The register containing the current character after LoadCurrentCharacter. 210 inline Register current_character() { return rdx; } 211 212 // The register containing the backtrack stack top. Provides a meaningful 213 // name to the register. 214 inline Register backtrack_stackpointer() { return rcx; } 215 216 // The registers containing a self pointer to this code's Code object. 217 inline Register code_object_pointer() { return r8; } 218 219 // Byte size of chars in the string to match (decided by the Mode argument) 220 inline int char_size() { return static_cast<int>(mode_); } 221 222 // Equivalent to a conditional branch to the label, unless the label 223 // is NULL, in which case it is a conditional Backtrack. 224 void BranchOrBacktrack(Condition condition, Label* to); 225 226 void MarkPositionForCodeRelativeFixup() { 227 code_relative_fixup_positions_.Add(masm_.pc_offset()); 228 } 229 230 void FixupCodeRelativePositions(); 231 232 // Call and return internally in the generated code in a way that 233 // is GC-safe (i.e., doesn't leave absolute code addresses on the stack) 234 inline void SafeCall(Label* to); 235 inline void SafeCallTarget(Label* label); 236 inline void SafeReturn(); 237 238 // Pushes the value of a register on the backtrack stack. Decrements the 239 // stack pointer (rcx) by a word size and stores the register's value there. 240 inline void Push(Register source); 241 242 // Pushes a value on the backtrack stack. Decrements the stack pointer (rcx) 243 // by a word size and stores the value there. 244 inline void Push(Immediate value); 245 246 // Pushes the Code object relative offset of a label on the backtrack stack 247 // (i.e., a backtrack target). Decrements the stack pointer (rcx) 248 // by a word size and stores the value there. 249 inline void Push(Label* label); 250 251 // Pops a value from the backtrack stack. Reads the word at the stack pointer 252 // (rcx) and increments it by a word size. 253 inline void Pop(Register target); 254 255 // Drops the top value from the backtrack stack without reading it. 256 // Increments the stack pointer (rcx) by a word size. 257 inline void Drop(); 258 259 MacroAssembler masm_; 260 MacroAssembler::NoRootArrayScope no_root_array_scope_; 261 262 ZoneList<int> code_relative_fixup_positions_; 263 264 // Which mode to generate code for (ASCII or UC16). 265 Mode mode_; 266 267 // One greater than maximal register index actually used. 268 int num_registers_; 269 270 // Number of registers to output at the end (the saved registers 271 // are always 0..num_saved_registers_-1) 272 int num_saved_registers_; 273 274 // Labels used internally. 275 Label entry_label_; 276 Label start_label_; 277 Label success_label_; 278 Label backtrack_label_; 279 Label exit_label_; 280 Label check_preempt_label_; 281 Label stack_overflow_label_; 282 }; 283 284 #endif // V8_INTERPRETED_REGEXP 285 286 }} // namespace v8::internal 287 288 #endif // V8_X64_REGEXP_MACRO_ASSEMBLER_X64_H_ 289
