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/codegen/macro-assembler.h" 9 #include "src/codegen/ppc/assembler-ppc.h" 10 #include "src/regexp/regexp-macro-assembler.h" 11 12 namespace v8 { 13 namespace internal { 14 15 class V8_EXPORT_PRIVATE RegExpMacroAssemblerPPC 16 : public NativeRegExpMacroAssembler { 17 public: 18 RegExpMacroAssemblerPPC(Isolate* isolate, Zone* zone, Mode mode, 19 int registers_to_save); 20 virtual ~RegExpMacroAssemblerPPC(); 21 virtual int stack_limit_slack(); 22 virtual void AdvanceCurrentPosition(int by); 23 virtual void AdvanceRegister(int reg, int by); 24 virtual void Backtrack(); 25 virtual void Bind(Label* label); 26 virtual void CheckAtStart(int cp_offset, Label* on_at_start); 27 virtual void CheckCharacter(unsigned c, Label* on_equal); 28 virtual void CheckCharacterAfterAnd(unsigned c, unsigned mask, 29 Label* on_equal); 30 virtual void CheckCharacterGT(uc16 limit, Label* on_greater); 31 virtual void CheckCharacterLT(uc16 limit, Label* on_less); 32 // A "greedy loop" is a loop that is both greedy and with a simple 33 // body. It has a particularly simple implementation. 34 virtual void CheckGreedyLoop(Label* on_tos_equals_current_position); 35 virtual void CheckNotAtStart(int cp_offset, Label* on_not_at_start); 36 virtual void CheckNotBackReference(int start_reg, bool read_backward, 37 Label* on_no_match); 38 virtual void CheckNotBackReferenceIgnoreCase(int start_reg, 39 bool read_backward, bool unicode, 40 Label* on_no_match); 41 virtual void CheckNotCharacter(unsigned c, Label* on_not_equal); 42 virtual void CheckNotCharacterAfterAnd(unsigned c, unsigned mask, 43 Label* on_not_equal); 44 virtual void CheckNotCharacterAfterMinusAnd(uc16 c, uc16 minus, uc16 mask, 45 Label* on_not_equal); 46 virtual void CheckCharacterInRange(uc16 from, uc16 to, Label* on_in_range); 47 virtual void CheckCharacterNotInRange(uc16 from, uc16 to, 48 Label* on_not_in_range); 49 virtual void CheckBitInTable(Handle<ByteArray> table, Label* on_bit_set); 50 51 // Checks whether the given offset from the current position is before 52 // the end of the string. 53 virtual void CheckPosition(int cp_offset, Label* on_outside_input); 54 virtual bool CheckSpecialCharacterClass(uc16 type, Label* on_no_match); 55 virtual void Fail(); 56 virtual Handle<HeapObject> GetCode(Handle<String> source); 57 virtual void GoTo(Label* label); 58 virtual void IfRegisterGE(int reg, int comparand, Label* if_ge); 59 virtual void IfRegisterLT(int reg, int comparand, Label* if_lt); 60 virtual void IfRegisterEqPos(int reg, Label* if_eq); 61 virtual IrregexpImplementation Implementation(); 62 virtual void LoadCurrentCharacterUnchecked(int cp_offset, 63 int character_count); 64 virtual void PopCurrentPosition(); 65 virtual void PopRegister(int register_index); 66 virtual void PushBacktrack(Label* label); 67 virtual void PushCurrentPosition(); 68 virtual void PushRegister(int register_index, 69 StackCheckFlag check_stack_limit); 70 virtual void ReadCurrentPositionFromRegister(int reg); 71 virtual void ReadStackPointerFromRegister(int reg); 72 virtual void SetCurrentPositionFromEnd(int by); 73 virtual void SetRegister(int register_index, int to); 74 virtual bool Succeed(); 75 virtual void WriteCurrentPositionToRegister(int reg, int cp_offset); 76 virtual void ClearRegisters(int reg_from, int reg_to); 77 virtual void WriteStackPointerToRegister(int reg); 78 79 // Called from RegExp if the stack-guard is triggered. 80 // If the code object is relocated, the return address is fixed before 81 // returning. 82 // {raw_code} is an Address because this is called via ExternalReference. 83 static int CheckStackGuardState(Address* return_address, Address raw_code, 84 Address re_frame); 85 86 private: 87 // Offsets from frame_pointer() of function parameters and stored registers. 88 static const int kFramePointer = 0; 89 90 // Above the frame pointer - Stored registers and stack passed parameters. 91 // Register 25..31. 92 static const int kStoredRegisters = kFramePointer; 93 // Return address (stored from link register, read into pc on return). 94 static const int kReturnAddress = kStoredRegisters + 7 * kSystemPointerSize; 95 static const int kCallerFrame = kReturnAddress + kSystemPointerSize; 96 // Stack parameters placed by caller. 97 static const int kIsolate = 98 kCallerFrame + kStackFrameExtraParamSlot * kSystemPointerSize; 99 100 // Below the frame pointer. 101 // Register parameters stored by setup code. 102 static const int kDirectCall = kFramePointer - kSystemPointerSize; 103 static const int kStackHighEnd = kDirectCall - kSystemPointerSize; 104 static const int kNumOutputRegisters = kStackHighEnd - kSystemPointerSize; 105 static const int kRegisterOutput = kNumOutputRegisters - kSystemPointerSize; 106 static const int kInputEnd = kRegisterOutput - kSystemPointerSize; 107 static const int kInputStart = kInputEnd - kSystemPointerSize; 108 static const int kStartIndex = kInputStart - kSystemPointerSize; 109 static const int kInputString = kStartIndex - kSystemPointerSize; 110 // When adding local variables remember to push space for them in 111 // the frame in GetCode. 112 static const int kSuccessfulCaptures = kInputString - kSystemPointerSize; 113 static const int kStringStartMinusOne = 114 kSuccessfulCaptures - kSystemPointerSize; 115 static const int kBacktrackCount = kStringStartMinusOne - kSystemPointerSize; 116 // First register address. Following registers are below it on the stack. 117 static const int kRegisterZero = kBacktrackCount - kSystemPointerSize; 118 119 // Initial size of code buffer. 120 static const int kRegExpCodeSize = 1024; 121 122 // Check whether preemption has been requested. 123 void CheckPreemption(); 124 125 // Check whether we are exceeding the stack limit on the backtrack stack. 126 void CheckStackLimit(); 127 128 129 // Generate a call to CheckStackGuardState. 130 void CallCheckStackGuardState(Register scratch); 131 132 // The ebp-relative location of a regexp register. 133 MemOperand register_location(int register_index); 134 135 // Register holding the current input position as negative offset from 136 // the end of the string. current_input_offset()137 inline Register current_input_offset() { return r27; } 138 139 // The register containing the current character after LoadCurrentCharacter. current_character()140 inline Register current_character() { return r28; } 141 142 // Register holding address of the end of the input string. end_of_input_address()143 inline Register end_of_input_address() { return r30; } 144 145 // Register holding the frame address. Local variables, parameters and 146 // regexp registers are addressed relative to this. frame_pointer()147 inline Register frame_pointer() { return fp; } 148 149 // The register containing the backtrack stack top. Provides a meaningful 150 // name to the register. backtrack_stackpointer()151 inline Register backtrack_stackpointer() { return r29; } 152 153 // Register holding pointer to the current code object. code_pointer()154 inline Register code_pointer() { return r26; } 155 156 // Byte size of chars in the string to match (decided by the Mode argument) char_size()157 inline int char_size() { return static_cast<int>(mode_); } 158 159 // Equivalent to a conditional branch to the label, unless the label 160 // is nullptr, in which case it is a conditional Backtrack. 161 void BranchOrBacktrack(Condition condition, Label* to, CRegister cr = cr7); 162 163 // Call and return internally in the generated code in a way that 164 // is GC-safe (i.e., doesn't leave absolute code addresses on the stack) 165 inline void SafeCall(Label* to, Condition cond = al, CRegister cr = cr7); 166 inline void SafeReturn(); 167 inline void SafeCallTarget(Label* name); 168 169 // Pushes the value of a register on the backtrack stack. Decrements the 170 // stack pointer by a word size and stores the register's value there. 171 inline void Push(Register source); 172 173 // Pops a value from the backtrack stack. Reads the word at the stack pointer 174 // and increments it by a word size. 175 inline void Pop(Register target); 176 isolate()177 Isolate* isolate() const { return masm_->isolate(); } 178 179 MacroAssembler* masm_; 180 181 // Which mode to generate code for (Latin1 or UC16). 182 Mode mode_; 183 184 // One greater than maximal register index actually used. 185 int num_registers_; 186 187 // Number of registers to output at the end (the saved registers 188 // are always 0..num_saved_registers_-1) 189 int num_saved_registers_; 190 191 // Labels used internally. 192 Label entry_label_; 193 Label start_label_; 194 Label success_label_; 195 Label backtrack_label_; 196 Label exit_label_; 197 Label check_preempt_label_; 198 Label stack_overflow_label_; 199 Label internal_failure_label_; 200 Label fallback_label_; 201 }; 202 203 // Set of non-volatile registers saved/restored by generated regexp code. 204 const RegList kRegExpCalleeSaved = 205 1 << 25 | 1 << 26 | 1 << 27 | 1 << 28 | 1 << 29 | 1 << 30 | 1 << 31; 206 207 } // namespace internal 208 } // namespace v8 209 210 #endif // V8_REGEXP_PPC_REGEXP_MACRO_ASSEMBLER_PPC_H_ 211