1// Copyright 2012 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#include "macro-assembler.h" 34 35namespace v8 { 36namespace internal { 37 38 39#ifndef V8_INTERPRETED_REGEXP 40class RegExpMacroAssemblerARM: public NativeRegExpMacroAssembler { 41 public: 42 RegExpMacroAssemblerARM(Mode mode, int registers_to_save, Zone* zone); 43 virtual ~RegExpMacroAssemblerARM(); 44 virtual int stack_limit_slack(); 45 virtual void AdvanceCurrentPosition(int by); 46 virtual void AdvanceRegister(int reg, int by); 47 virtual void Backtrack(); 48 virtual void Bind(Label* label); 49 virtual void CheckAtStart(Label* on_at_start); 50 virtual void CheckCharacter(unsigned c, Label* on_equal); 51 virtual void CheckCharacterAfterAnd(unsigned c, 52 unsigned mask, 53 Label* on_equal); 54 virtual void CheckCharacterGT(uc16 limit, Label* on_greater); 55 virtual void CheckCharacterLT(uc16 limit, Label* on_less); 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 CheckNotCharacter(unsigned c, Label* on_not_equal); 64 virtual void CheckNotCharacterAfterAnd(unsigned c, 65 unsigned mask, 66 Label* on_not_equal); 67 virtual void CheckNotCharacterAfterMinusAnd(uc16 c, 68 uc16 minus, 69 uc16 mask, 70 Label* on_not_equal); 71 virtual void CheckCharacterInRange(uc16 from, 72 uc16 to, 73 Label* on_in_range); 74 virtual void CheckCharacterNotInRange(uc16 from, 75 uc16 to, 76 Label* on_not_in_range); 77 virtual void CheckBitInTable(Handle<ByteArray> table, Label* on_bit_set); 78 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 bool 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 virtual bool CanReadUnaligned(); 110 111 // Called from RegExp if the stack-guard is triggered. 112 // If the code object is relocated, the return address is fixed before 113 // returning. 114 static int CheckStackGuardState(Address* return_address, 115 Code* re_code, 116 Address re_frame); 117 118 private: 119 // Offsets from frame_pointer() of function parameters and stored registers. 120 static const int kFramePointer = 0; 121 122 // Above the frame pointer - Stored registers and stack passed parameters. 123 // Register 4..11. 124 static const int kStoredRegisters = kFramePointer; 125 // Return address (stored from link register, read into pc on return). 126 static const int kReturnAddress = kStoredRegisters + 8 * kPointerSize; 127 static const int kSecondaryReturnAddress = kReturnAddress + kPointerSize; 128 // Stack parameters placed by caller. 129 static const int kRegisterOutput = kSecondaryReturnAddress + kPointerSize; 130 static const int kNumOutputRegisters = kRegisterOutput + kPointerSize; 131 static const int kStackHighEnd = kNumOutputRegisters + kPointerSize; 132 static const int kDirectCall = kStackHighEnd + kPointerSize; 133 static const int kIsolate = kDirectCall + kPointerSize; 134 135 // Below the frame pointer. 136 // Register parameters stored by setup code. 137 static const int kInputEnd = kFramePointer - kPointerSize; 138 static const int kInputStart = kInputEnd - kPointerSize; 139 static const int kStartIndex = kInputStart - kPointerSize; 140 static const int kInputString = kStartIndex - kPointerSize; 141 // When adding local variables remember to push space for them in 142 // the frame in GetCode. 143 static const int kSuccessfulCaptures = kInputString - kPointerSize; 144 static const int kInputStartMinusOne = kSuccessfulCaptures - kPointerSize; 145 // First register address. Following registers are below it on the stack. 146 static const int kRegisterZero = kInputStartMinusOne - kPointerSize; 147 148 // Initial size of code buffer. 149 static const size_t kRegExpCodeSize = 1024; 150 151 static const int kBacktrackConstantPoolSize = 4; 152 153 // Load a number of characters at the given offset from the 154 // current position, into the current-character register. 155 void LoadCurrentCharacterUnchecked(int cp_offset, int character_count); 156 157 // Check whether preemption has been requested. 158 void CheckPreemption(); 159 160 // Check whether we are exceeding the stack limit on the backtrack stack. 161 void CheckStackLimit(); 162 163 void EmitBacktrackConstantPool(); 164 int GetBacktrackConstantPoolEntry(); 165 166 167 // Generate a call to CheckStackGuardState. 168 void CallCheckStackGuardState(Register scratch); 169 170 // The ebp-relative location of a regexp register. 171 MemOperand register_location(int register_index); 172 173 // Register holding the current input position as negative offset from 174 // the end of the string. 175 inline Register current_input_offset() { return r6; } 176 177 // The register containing the current character after LoadCurrentCharacter. 178 inline Register current_character() { return r7; } 179 180 // Register holding address of the end of the input string. 181 inline Register end_of_input_address() { return r10; } 182 183 // Register holding the frame address. Local variables, parameters and 184 // regexp registers are addressed relative to this. 185 inline Register frame_pointer() { return fp; } 186 187 // The register containing the backtrack stack top. Provides a meaningful 188 // name to the register. 189 inline Register backtrack_stackpointer() { return r8; } 190 191 // Register holding pointer to the current code object. 192 inline Register code_pointer() { return r5; } 193 194 // Byte size of chars in the string to match (decided by the Mode argument) 195 inline int char_size() { return static_cast<int>(mode_); } 196 197 // Equivalent to a conditional branch to the label, unless the label 198 // is NULL, in which case it is a conditional Backtrack. 199 void BranchOrBacktrack(Condition condition, Label* to); 200 201 // Call and return internally in the generated code in a way that 202 // is GC-safe (i.e., doesn't leave absolute code addresses on the stack) 203 inline void SafeCall(Label* to, Condition cond = al); 204 inline void SafeReturn(); 205 inline void SafeCallTarget(Label* name); 206 207 // Pushes the value of a register on the backtrack stack. Decrements the 208 // stack pointer by a word size and stores the register's value there. 209 inline void Push(Register source); 210 211 // Pops a value from the backtrack stack. Reads the word at the stack pointer 212 // and increments it by a word size. 213 inline void Pop(Register target); 214 215 // Calls a C function and cleans up the frame alignment done by 216 // by FrameAlign. The called function *is* allowed to trigger a garbage 217 // collection, but may not take more than four arguments (no arguments 218 // passed on the stack), and the first argument will be a pointer to the 219 // return address. 220 inline void CallCFunctionUsingStub(ExternalReference function, 221 int num_arguments); 222 223 Isolate* isolate() const { return masm_->isolate(); } 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