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