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 #include "arm/assembler-arm.h" 32 #include "arm/assembler-arm-inl.h" 33 34 namespace v8 { 35 namespace internal { 36 37 38 #ifdef V8_INTERPRETED_REGEXP 39 class RegExpMacroAssemblerARM: public RegExpMacroAssembler { 40 public: 41 RegExpMacroAssemblerARM(); 42 virtual ~RegExpMacroAssemblerARM(); 43 }; 44 45 #else // V8_INTERPRETED_REGEXP 46 class RegExpMacroAssemblerARM: public NativeRegExpMacroAssembler { 47 public: 48 RegExpMacroAssemblerARM(Mode mode, int registers_to_save); 49 virtual ~RegExpMacroAssemblerARM(); 50 virtual int stack_limit_slack(); 51 virtual void AdvanceCurrentPosition(int by); 52 virtual void AdvanceRegister(int reg, int by); 53 virtual void Backtrack(); 54 virtual void Bind(Label* label); 55 virtual void CheckAtStart(Label* on_at_start); 56 virtual void CheckCharacter(unsigned c, Label* on_equal); 57 virtual void CheckCharacterAfterAnd(unsigned c, 58 unsigned mask, 59 Label* on_equal); 60 virtual void CheckCharacterGT(uc16 limit, Label* on_greater); 61 virtual void CheckCharacterLT(uc16 limit, Label* on_less); 62 virtual void CheckCharacters(Vector<const uc16> str, 63 int cp_offset, 64 Label* on_failure, 65 bool check_end_of_string); 66 // A "greedy loop" is a loop that is both greedy and with a simple 67 // body. It has a particularly simple implementation. 68 virtual void CheckGreedyLoop(Label* on_tos_equals_current_position); 69 virtual void CheckNotAtStart(Label* on_not_at_start); 70 virtual void CheckNotBackReference(int start_reg, Label* on_no_match); 71 virtual void CheckNotBackReferenceIgnoreCase(int start_reg, 72 Label* on_no_match); 73 virtual void CheckNotRegistersEqual(int reg1, int reg2, Label* on_not_equal); 74 virtual void CheckNotCharacter(unsigned c, Label* on_not_equal); 75 virtual void CheckNotCharacterAfterAnd(unsigned c, 76 unsigned mask, 77 Label* on_not_equal); 78 virtual void CheckNotCharacterAfterMinusAnd(uc16 c, 79 uc16 minus, 80 uc16 mask, 81 Label* on_not_equal); 82 // Checks whether the given offset from the current position is before 83 // the end of the string. 84 virtual void CheckPosition(int cp_offset, Label* on_outside_input); 85 virtual bool CheckSpecialCharacterClass(uc16 type, 86 Label* on_no_match); 87 virtual void Fail(); 88 virtual Handle<HeapObject> GetCode(Handle<String> source); 89 virtual void GoTo(Label* label); 90 virtual void IfRegisterGE(int reg, int comparand, Label* if_ge); 91 virtual void IfRegisterLT(int reg, int comparand, Label* if_lt); 92 virtual void IfRegisterEqPos(int reg, Label* if_eq); 93 virtual IrregexpImplementation Implementation(); 94 virtual void LoadCurrentCharacter(int cp_offset, 95 Label* on_end_of_input, 96 bool check_bounds = true, 97 int characters = 1); 98 virtual void PopCurrentPosition(); 99 virtual void PopRegister(int register_index); 100 virtual void PushBacktrack(Label* label); 101 virtual void PushCurrentPosition(); 102 virtual void PushRegister(int register_index, 103 StackCheckFlag check_stack_limit); 104 virtual void ReadCurrentPositionFromRegister(int reg); 105 virtual void ReadStackPointerFromRegister(int reg); 106 virtual void SetCurrentPositionFromEnd(int by); 107 virtual void SetRegister(int register_index, int to); 108 virtual void Succeed(); 109 virtual void WriteCurrentPositionToRegister(int reg, int cp_offset); 110 virtual void ClearRegisters(int reg_from, int reg_to); 111 virtual void WriteStackPointerToRegister(int reg); 112 113 // Called from RegExp if the stack-guard is triggered. 114 // If the code object is relocated, the return address is fixed before 115 // returning. 116 static int CheckStackGuardState(Address* return_address, 117 Code* re_code, 118 Address re_frame); 119 120 private: 121 // Offsets from frame_pointer() of function parameters and stored registers. 122 static const int kFramePointer = 0; 123 124 // Above the frame pointer - Stored registers and stack passed parameters. 125 // Register 4..11. 126 static const int kStoredRegisters = kFramePointer; 127 // Return address (stored from link register, read into pc on return). 128 static const int kReturnAddress = kStoredRegisters + 8 * kPointerSize; 129 static const int kSecondaryReturnAddress = kReturnAddress + kPointerSize; 130 // Stack parameters placed by caller. 131 static const int kRegisterOutput = kSecondaryReturnAddress + kPointerSize; 132 static const int kStackHighEnd = kRegisterOutput + kPointerSize; 133 static const int kDirectCall = kStackHighEnd + kPointerSize; 134 static const int kIsolate = kDirectCall + kPointerSize; 135 136 // Below the frame pointer. 137 // Register parameters stored by setup code. 138 static const int kInputEnd = kFramePointer - kPointerSize; 139 static const int kInputStart = kInputEnd - kPointerSize; 140 static const int kStartIndex = kInputStart - kPointerSize; 141 static const int kInputString = kStartIndex - kPointerSize; 142 // When adding local variables remember to push space for them in 143 // the frame in GetCode. 144 static const int kInputStartMinusOne = kInputString - kPointerSize; 145 static const int kAtStart = kInputStartMinusOne - kPointerSize; 146 // First register address. Following registers are below it on the stack. 147 static const int kRegisterZero = kAtStart - kPointerSize; 148 149 // Initial size of code buffer. 150 static const size_t kRegExpCodeSize = 1024; 151 152 static const int kBacktrackConstantPoolSize = 4; 153 154 // Load a number of characters at the given offset from the 155 // current position, into the current-character register. 156 void LoadCurrentCharacterUnchecked(int cp_offset, int character_count); 157 158 // Check whether preemption has been requested. 159 void CheckPreemption(); 160 161 // Check whether we are exceeding the stack limit on the backtrack stack. 162 void CheckStackLimit(); 163 164 void EmitBacktrackConstantPool(); 165 int GetBacktrackConstantPoolEntry(); 166 167 168 // Generate a call to CheckStackGuardState. 169 void CallCheckStackGuardState(Register scratch); 170 171 // The ebp-relative location of a regexp register. 172 MemOperand register_location(int register_index); 173 174 // Register holding the current input position as negative offset from 175 // the end of the string. 176 inline Register current_input_offset() { return r6; } 177 178 // The register containing the current character after LoadCurrentCharacter. 179 inline Register current_character() { return r7; } 180 181 // Register holding address of the end of the input string. 182 inline Register end_of_input_address() { return r10; } 183 184 // Register holding the frame address. Local variables, parameters and 185 // regexp registers are addressed relative to this. 186 inline Register frame_pointer() { return fp; } 187 188 // The register containing the backtrack stack top. Provides a meaningful 189 // name to the register. 190 inline Register backtrack_stackpointer() { return r8; } 191 192 // Register holding pointer to the current code object. 193 inline Register code_pointer() { return r5; } 194 195 // Byte size of chars in the string to match (decided by the Mode argument) 196 inline int char_size() { return static_cast<int>(mode_); } 197 198 // Equivalent to a conditional branch to the label, unless the label 199 // is NULL, in which case it is a conditional Backtrack. 200 void BranchOrBacktrack(Condition condition, Label* to); 201 202 // Call and return internally in the generated code in a way that 203 // is GC-safe (i.e., doesn't leave absolute code addresses on the stack) 204 inline void SafeCall(Label* to, Condition cond = al); 205 inline void SafeReturn(); 206 inline void SafeCallTarget(Label* name); 207 208 // Pushes the value of a register on the backtrack stack. Decrements the 209 // stack pointer by a word size and stores the register's value there. 210 inline void Push(Register source); 211 212 // Pops a value from the backtrack stack. Reads the word at the stack pointer 213 // and increments it by a word size. 214 inline void Pop(Register target); 215 216 // Calls a C function and cleans up the frame alignment done by 217 // by FrameAlign. The called function *is* allowed to trigger a garbage 218 // collection, but may not take more than four arguments (no arguments 219 // passed on the stack), and the first argument will be a pointer to the 220 // return address. 221 inline void CallCFunctionUsingStub(ExternalReference function, 222 int num_arguments); 223 224 225 MacroAssembler* masm_; 226 227 // Which mode to generate code for (ASCII or UC16). 228 Mode mode_; 229 230 // One greater than maximal register index actually used. 231 int num_registers_; 232 233 // Number of registers to output at the end (the saved registers 234 // are always 0..num_saved_registers_-1) 235 int num_saved_registers_; 236 237 // Manage a small pre-allocated pool for writing label targets 238 // to for pushing backtrack addresses. 239 int backtrack_constant_pool_offset_; 240 int backtrack_constant_pool_capacity_; 241 242 // Labels used internally. 243 Label entry_label_; 244 Label start_label_; 245 Label success_label_; 246 Label backtrack_label_; 247 Label exit_label_; 248 Label check_preempt_label_; 249 Label stack_overflow_label_; 250 }; 251 252 #endif // V8_INTERPRETED_REGEXP 253 254 255 }} // namespace v8::internal 256 257 #endif // V8_ARM_REGEXP_MACRO_ASSEMBLER_ARM_H_ 258