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 82 // Called from RegExp if the stack-guard is triggered. 83 // If the code object is relocated, the return address is fixed before 84 // returning. 85 static int CheckStackGuardState(Address* return_address, Code* re_code, 86 Address re_frame); 87 88 private: 89 // Offsets from frame_pointer() of function parameters and stored registers. 90 static const int kFramePointer = 0; 91 92 // Above the frame pointer - Stored registers and stack passed parameters. 93 // Register 25..31. 94 static const int kStoredRegisters = kFramePointer; 95 // Return address (stored from link register, read into pc on return). 96 static const int kReturnAddress = kStoredRegisters + 7 * kPointerSize; 97 static const int kCallerFrame = kReturnAddress + kPointerSize; 98 // Stack parameters placed by caller. 99 static const int kSecondaryReturnAddress = 100 kCallerFrame + kStackFrameExtraParamSlot * kPointerSize; 101 static const int kIsolate = kSecondaryReturnAddress + kPointerSize; 102 103 // Below the frame pointer. 104 // Register parameters stored by setup code. 105 static const int kDirectCall = kFramePointer - kPointerSize; 106 static const int kStackHighEnd = kDirectCall - kPointerSize; 107 static const int kNumOutputRegisters = kStackHighEnd - kPointerSize; 108 static const int kRegisterOutput = kNumOutputRegisters - kPointerSize; 109 static const int kInputEnd = kRegisterOutput - kPointerSize; 110 static const int kInputStart = kInputEnd - kPointerSize; 111 static const int kStartIndex = kInputStart - kPointerSize; 112 static const int kInputString = kStartIndex - kPointerSize; 113 // When adding local variables remember to push space for them in 114 // the frame in GetCode. 115 static const int kSuccessfulCaptures = kInputString - kPointerSize; 116 static const int kStringStartMinusOne = kSuccessfulCaptures - kPointerSize; 117 // First register address. Following registers are below it on the stack. 118 static const int kRegisterZero = kStringStartMinusOne - kPointerSize; 119 120 // Initial size of code buffer. 121 static const size_t kRegExpCodeSize = 1024; 122 123 // Load a number of characters at the given offset from the 124 // current position, into the current-character register. 125 void LoadCurrentCharacterUnchecked(int cp_offset, int character_count); 126 127 // Check whether preemption has been requested. 128 void CheckPreemption(); 129 130 // Check whether we are exceeding the stack limit on the backtrack stack. 131 void CheckStackLimit(); 132 133 134 // Generate a call to CheckStackGuardState. 135 void CallCheckStackGuardState(Register scratch); 136 137 // The ebp-relative location of a regexp register. 138 MemOperand register_location(int register_index); 139 140 // Register holding the current input position as negative offset from 141 // the end of the string. 142 inline Register current_input_offset() { return r27; } 143 144 // The register containing the current character after LoadCurrentCharacter. 145 inline Register current_character() { return r28; } 146 147 // Register holding address of the end of the input string. 148 inline Register end_of_input_address() { return r30; } 149 150 // Register holding the frame address. Local variables, parameters and 151 // regexp registers are addressed relative to this. 152 inline Register frame_pointer() { return fp; } 153 154 // The register containing the backtrack stack top. Provides a meaningful 155 // name to the register. 156 inline Register backtrack_stackpointer() { return r29; } 157 158 // Register holding pointer to the current code object. 159 inline Register code_pointer() { return r26; } 160 161 // Byte size of chars in the string to match (decided by the Mode argument) 162 inline int char_size() { return static_cast<int>(mode_); } 163 164 // Equivalent to a conditional branch to the label, unless the label 165 // is NULL, in which case it is a conditional Backtrack. 166 void BranchOrBacktrack(Condition condition, Label* to, CRegister cr = cr7); 167 168 // Call and return internally in the generated code in a way that 169 // is GC-safe (i.e., doesn't leave absolute code addresses on the stack) 170 inline void SafeCall(Label* to, Condition cond = al, CRegister cr = cr7); 171 inline void SafeReturn(); 172 inline void SafeCallTarget(Label* name); 173 174 // Pushes the value of a register on the backtrack stack. Decrements the 175 // stack pointer by a word size and stores the register's value there. 176 inline void Push(Register source); 177 178 // Pops a value from the backtrack stack. Reads the word at the stack pointer 179 // and increments it by a word size. 180 inline void Pop(Register target); 181 182 Isolate* isolate() const { return masm_->isolate(); } 183 184 MacroAssembler* masm_; 185 186 // Which mode to generate code for (Latin1 or UC16). 187 Mode mode_; 188 189 // One greater than maximal register index actually used. 190 int num_registers_; 191 192 // Number of registers to output at the end (the saved registers 193 // are always 0..num_saved_registers_-1) 194 int num_saved_registers_; 195 196 // Labels used internally. 197 Label entry_label_; 198 Label start_label_; 199 Label success_label_; 200 Label backtrack_label_; 201 Label exit_label_; 202 Label check_preempt_label_; 203 Label stack_overflow_label_; 204 Label internal_failure_label_; 205 }; 206 207 // Set of non-volatile registers saved/restored by generated regexp code. 208 const RegList kRegExpCalleeSaved = 209 1 << 25 | 1 << 26 | 1 << 27 | 1 << 28 | 1 << 29 | 1 << 30 | 1 << 31; 210 211 #endif // V8_INTERPRETED_REGEXP 212 } // namespace internal 213 } // namespace v8 214 215 #endif // V8_REGEXP_PPC_REGEXP_MACRO_ASSEMBLER_PPC_H_ 216
