1 // Copyright 2014 the V8 project authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef V8_REGEXP_PPC_REGEXP_MACRO_ASSEMBLER_PPC_H_ 6 #define V8_REGEXP_PPC_REGEXP_MACRO_ASSEMBLER_PPC_H_ 7 8 #include "src/macro-assembler.h" 9 #include "src/ppc/assembler-ppc.h" 10 #include "src/ppc/frames-ppc.h" 11 #include "src/regexp/regexp-macro-assembler.h" 12 13 namespace v8 { 14 namespace internal { 15 16 17 #ifndef V8_INTERPRETED_REGEXP 18 class RegExpMacroAssemblerPPC : public NativeRegExpMacroAssembler { 19 public: 20 RegExpMacroAssemblerPPC(Isolate* isolate, Zone* zone, Mode mode, 21 int registers_to_save); 22 virtual ~RegExpMacroAssemblerPPC(); 23 virtual int stack_limit_slack(); 24 virtual void AdvanceCurrentPosition(int by); 25 virtual void AdvanceRegister(int reg, int by); 26 virtual void Backtrack(); 27 virtual void Bind(Label* label); 28 virtual void CheckAtStart(Label* on_at_start); 29 virtual void CheckCharacter(unsigned c, Label* on_equal); 30 virtual void CheckCharacterAfterAnd(unsigned c, unsigned mask, 31 Label* on_equal); 32 virtual void CheckCharacterGT(uc16 limit, Label* on_greater); 33 virtual void CheckCharacterLT(uc16 limit, Label* on_less); 34 // A "greedy loop" is a loop that is both greedy and with a simple 35 // body. It has a particularly simple implementation. 36 virtual void CheckGreedyLoop(Label* on_tos_equals_current_position); 37 virtual void CheckNotAtStart(int cp_offset, Label* on_not_at_start); 38 virtual void CheckNotBackReference(int start_reg, bool read_backward, 39 Label* on_no_match); 40 virtual void CheckNotBackReferenceIgnoreCase(int start_reg, 41 bool read_backward, bool unicode, 42 Label* on_no_match); 43 virtual void CheckNotCharacter(unsigned c, Label* on_not_equal); 44 virtual void CheckNotCharacterAfterAnd(unsigned c, unsigned mask, 45 Label* on_not_equal); 46 virtual void CheckNotCharacterAfterMinusAnd(uc16 c, uc16 minus, uc16 mask, 47 Label* on_not_equal); 48 virtual void CheckCharacterInRange(uc16 from, uc16 to, Label* on_in_range); 49 virtual void CheckCharacterNotInRange(uc16 from, uc16 to, 50 Label* on_not_in_range); 51 virtual void CheckBitInTable(Handle<ByteArray> table, Label* on_bit_set); 52 53 // Checks whether the given offset from the current position is before 54 // the end of the string. 55 virtual void CheckPosition(int cp_offset, Label* on_outside_input); 56 virtual bool CheckSpecialCharacterClass(uc16 type, Label* on_no_match); 57 virtual void Fail(); 58 virtual Handle<HeapObject> GetCode(Handle<String> source); 59 virtual void GoTo(Label* label); 60 virtual void IfRegisterGE(int reg, int comparand, Label* if_ge); 61 virtual void IfRegisterLT(int reg, int comparand, Label* if_lt); 62 virtual void IfRegisterEqPos(int reg, Label* if_eq); 63 virtual IrregexpImplementation Implementation(); 64 virtual void LoadCurrentCharacter(int cp_offset, Label* on_end_of_input, 65 bool check_bounds = true, 66 int characters = 1); 67 virtual void PopCurrentPosition(); 68 virtual void PopRegister(int register_index); 69 virtual void PushBacktrack(Label* label); 70 virtual void PushCurrentPosition(); 71 virtual void PushRegister(int register_index, 72 StackCheckFlag check_stack_limit); 73 virtual void ReadCurrentPositionFromRegister(int reg); 74 virtual void ReadStackPointerFromRegister(int reg); 75 virtual void SetCurrentPositionFromEnd(int by); 76 virtual void SetRegister(int register_index, int to); 77 virtual bool Succeed(); 78 virtual void WriteCurrentPositionToRegister(int reg, int cp_offset); 79 virtual void ClearRegisters(int reg_from, int reg_to); 80 virtual void WriteStackPointerToRegister(int reg); 81 virtual bool CanReadUnaligned(); 82 83 // Called from RegExp if the stack-guard is triggered. 84 // If the code object is relocated, the return address is fixed before 85 // returning. 86 static int CheckStackGuardState(Address* return_address, Code* re_code, 87 Address re_frame); 88 89 private: 90 // Offsets from frame_pointer() of function parameters and stored registers. 91 static const int kFramePointer = 0; 92 93 // Above the frame pointer - Stored registers and stack passed parameters. 94 // Register 25..31. 95 static const int kStoredRegisters = kFramePointer; 96 // Return address (stored from link register, read into pc on return). 97 static const int kReturnAddress = kStoredRegisters + 7 * kPointerSize; 98 static const int kCallerFrame = kReturnAddress + kPointerSize; 99 // Stack parameters placed by caller. 100 static const int kSecondaryReturnAddress = 101 kCallerFrame + kStackFrameExtraParamSlot * kPointerSize; 102 static const int kIsolate = kSecondaryReturnAddress + kPointerSize; 103 104 // Below the frame pointer. 105 // Register parameters stored by setup code. 106 static const int kDirectCall = kFramePointer - kPointerSize; 107 static const int kStackHighEnd = kDirectCall - kPointerSize; 108 static const int kNumOutputRegisters = kStackHighEnd - kPointerSize; 109 static const int kRegisterOutput = kNumOutputRegisters - kPointerSize; 110 static const int kInputEnd = kRegisterOutput - kPointerSize; 111 static const int kInputStart = kInputEnd - kPointerSize; 112 static const int kStartIndex = kInputStart - kPointerSize; 113 static const int kInputString = kStartIndex - kPointerSize; 114 // When adding local variables remember to push space for them in 115 // the frame in GetCode. 116 static const int kSuccessfulCaptures = kInputString - kPointerSize; 117 static const int kStringStartMinusOne = kSuccessfulCaptures - kPointerSize; 118 // First register address. Following registers are below it on the stack. 119 static const int kRegisterZero = kStringStartMinusOne - kPointerSize; 120 121 // Initial size of code buffer. 122 static const size_t kRegExpCodeSize = 1024; 123 124 // Load a number of characters at the given offset from the 125 // current position, into the current-character register. 126 void LoadCurrentCharacterUnchecked(int cp_offset, int character_count); 127 128 // Check whether preemption has been requested. 129 void CheckPreemption(); 130 131 // Check whether we are exceeding the stack limit on the backtrack stack. 132 void CheckStackLimit(); 133 134 135 // Generate a call to CheckStackGuardState. 136 void CallCheckStackGuardState(Register scratch); 137 138 // The ebp-relative location of a regexp register. 139 MemOperand register_location(int register_index); 140 141 // Register holding the current input position as negative offset from 142 // the end of the string. current_input_offset()143 inline Register current_input_offset() { return r27; } 144 145 // The register containing the current character after LoadCurrentCharacter. current_character()146 inline Register current_character() { return r28; } 147 148 // Register holding address of the end of the input string. end_of_input_address()149 inline Register end_of_input_address() { return r30; } 150 151 // Register holding the frame address. Local variables, parameters and 152 // regexp registers are addressed relative to this. frame_pointer()153 inline Register frame_pointer() { return fp; } 154 155 // The register containing the backtrack stack top. Provides a meaningful 156 // name to the register. backtrack_stackpointer()157 inline Register backtrack_stackpointer() { return r29; } 158 159 // Register holding pointer to the current code object. code_pointer()160 inline Register code_pointer() { return r26; } 161 162 // Byte size of chars in the string to match (decided by the Mode argument) char_size()163 inline int char_size() { return static_cast<int>(mode_); } 164 165 // Equivalent to a conditional branch to the label, unless the label 166 // is NULL, in which case it is a conditional Backtrack. 167 void BranchOrBacktrack(Condition condition, Label* to, CRegister cr = cr7); 168 169 // Call and return internally in the generated code in a way that 170 // is GC-safe (i.e., doesn't leave absolute code addresses on the stack) 171 inline void SafeCall(Label* to, Condition cond = al, CRegister cr = cr7); 172 inline void SafeReturn(); 173 inline void SafeCallTarget(Label* name); 174 175 // Pushes the value of a register on the backtrack stack. Decrements the 176 // stack pointer by a word size and stores the register's value there. 177 inline void Push(Register source); 178 179 // Pops a value from the backtrack stack. Reads the word at the stack pointer 180 // and increments it by a word size. 181 inline void Pop(Register target); 182 isolate()183 Isolate* isolate() const { return masm_->isolate(); } 184 185 MacroAssembler* masm_; 186 187 // Which mode to generate code for (Latin1 or UC16). 188 Mode mode_; 189 190 // One greater than maximal register index actually used. 191 int num_registers_; 192 193 // Number of registers to output at the end (the saved registers 194 // are always 0..num_saved_registers_-1) 195 int num_saved_registers_; 196 197 // Labels used internally. 198 Label entry_label_; 199 Label start_label_; 200 Label success_label_; 201 Label backtrack_label_; 202 Label exit_label_; 203 Label check_preempt_label_; 204 Label stack_overflow_label_; 205 Label internal_failure_label_; 206 }; 207 208 // Set of non-volatile registers saved/restored by generated regexp code. 209 const RegList kRegExpCalleeSaved = 210 1 << 25 | 1 << 26 | 1 << 27 | 1 << 28 | 1 << 29 | 1 << 30 | 1 << 31; 211 212 #endif // V8_INTERPRETED_REGEXP 213 } // namespace internal 214 } // namespace v8 215 216 #endif // V8_REGEXP_PPC_REGEXP_MACRO_ASSEMBLER_PPC_H_ 217