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/regexp/regexp-macro-assembler.h" 10 11 namespace v8 { 12 namespace internal { 13 14 class V8_EXPORT_PRIVATE RegExpMacroAssemblerPPC 15 : public NativeRegExpMacroAssembler { 16 public: 17 RegExpMacroAssemblerPPC(Isolate* isolate, Zone* zone, Mode mode, 18 int registers_to_save); 19 virtual ~RegExpMacroAssemblerPPC(); 20 virtual int stack_limit_slack(); 21 virtual void AdvanceCurrentPosition(int by); 22 virtual void AdvanceRegister(int reg, int by); 23 virtual void Backtrack(); 24 virtual void Bind(Label* label); 25 virtual void CheckAtStart(int cp_offset, Label* on_at_start); 26 virtual void CheckCharacter(unsigned c, Label* on_equal); 27 virtual void CheckCharacterAfterAnd(unsigned c, unsigned mask, 28 Label* on_equal); 29 virtual void CheckCharacterGT(base::uc16 limit, Label* on_greater); 30 virtual void CheckCharacterLT(base::uc16 limit, Label* on_less); 31 // A "greedy loop" is a loop that is both greedy and with a simple 32 // body. It has a particularly simple implementation. 33 virtual void CheckGreedyLoop(Label* on_tos_equals_current_position); 34 virtual void CheckNotAtStart(int cp_offset, Label* on_not_at_start); 35 virtual void CheckNotBackReference(int start_reg, bool read_backward, 36 Label* on_no_match); 37 virtual void CheckNotBackReferenceIgnoreCase(int start_reg, 38 bool read_backward, bool unicode, 39 Label* on_no_match); 40 virtual void CheckNotCharacter(unsigned c, Label* on_not_equal); 41 virtual void CheckNotCharacterAfterAnd(unsigned c, unsigned mask, 42 Label* on_not_equal); 43 virtual void CheckNotCharacterAfterMinusAnd(base::uc16 c, base::uc16 minus, 44 base::uc16 mask, 45 Label* on_not_equal); 46 virtual void CheckCharacterInRange(base::uc16 from, base::uc16 to, 47 Label* on_in_range); 48 virtual void CheckCharacterNotInRange(base::uc16 from, base::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(base::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 LoadCurrentCharacterUnchecked(int cp_offset, 64 int character_count); 65 virtual void PopCurrentPosition(); 66 virtual void PopRegister(int register_index); 67 virtual void PushBacktrack(Label* label); 68 virtual void PushCurrentPosition(); 69 virtual void PushRegister(int register_index, 70 StackCheckFlag check_stack_limit); 71 virtual void ReadCurrentPositionFromRegister(int reg); 72 virtual void ReadStackPointerFromRegister(int reg); 73 virtual void SetCurrentPositionFromEnd(int by); 74 virtual void SetRegister(int register_index, int to); 75 virtual bool Succeed(); 76 virtual void WriteCurrentPositionToRegister(int reg, int cp_offset); 77 virtual void ClearRegisters(int reg_from, int reg_to); 78 virtual void WriteStackPointerToRegister(int reg); 79 80 // Called from RegExp if the stack-guard is triggered. 81 // If the code object is relocated, the return address is fixed before 82 // returning. 83 // {raw_code} is an Address because this is called via ExternalReference. 84 static int CheckStackGuardState(Address* return_address, Address raw_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 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 97 // Below the frame pointer. 98 // Register parameters stored by setup code. 99 static const int kIsolate = kFramePointer - kSystemPointerSize; 100 static const int kDirectCall = kIsolate - kSystemPointerSize; 101 static const int kNumOutputRegisters = kDirectCall - kSystemPointerSize; 102 static const int kRegisterOutput = kNumOutputRegisters - kSystemPointerSize; 103 static const int kInputEnd = kRegisterOutput - kSystemPointerSize; 104 static const int kInputStart = kInputEnd - kSystemPointerSize; 105 static const int kStartIndex = kInputStart - kSystemPointerSize; 106 static const int kInputString = kStartIndex - kSystemPointerSize; 107 // When adding local variables remember to push space for them in 108 // the frame in GetCode. 109 static const int kSuccessfulCaptures = kInputString - kSystemPointerSize; 110 static const int kStringStartMinusOne = 111 kSuccessfulCaptures - kSystemPointerSize; 112 static const int kBacktrackCount = kStringStartMinusOne - kSystemPointerSize; 113 // Stores the initial value of the regexp stack pointer in a 114 // position-independent representation (in case the regexp stack grows and 115 // thus moves). 116 static const int kRegExpStackBasePointer = 117 kBacktrackCount - kSystemPointerSize; 118 119 // First register address. Following registers are below it on the stack. 120 static const int kRegisterZero = kRegExpStackBasePointer - kSystemPointerSize; 121 122 // Initial size of code buffer. 123 static const int kRegExpCodeSize = 1024; 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 static constexpr Register current_input_offset() { return r27; } 141 142 // The register containing the current character after LoadCurrentCharacter. current_character()143 static constexpr Register current_character() { return r28; } 144 145 // Register holding address of the end of the input string. end_of_input_address()146 static constexpr 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 static constexpr 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 static constexpr Register backtrack_stackpointer() { return r29; } 155 156 // Register holding pointer to the current code object. code_pointer()157 static constexpr 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() const { 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); 179 180 void LoadRegExpStackPointerFromMemory(Register dst); 181 void StoreRegExpStackPointerToMemory(Register src, Register scratch); 182 void PushRegExpBasePointer(Register stack_pointer, Register scratch); 183 void PopRegExpBasePointer(Register stack_pointer_out, Register scratch); 184 isolate()185 Isolate* isolate() const { return masm_->isolate(); } 186 187 const std::unique_ptr<MacroAssembler> masm_; 188 const NoRootArrayScope no_root_array_scope_; 189 190 // Which mode to generate code for (Latin1 or UC16). 191 const Mode mode_; 192 193 // One greater than maximal register index actually used. 194 int num_registers_; 195 196 // Number of registers to output at the end (the saved registers 197 // are always 0..num_saved_registers_-1) 198 const int num_saved_registers_; 199 200 // Labels used internally. 201 Label entry_label_; 202 Label start_label_; 203 Label success_label_; 204 Label backtrack_label_; 205 Label exit_label_; 206 Label check_preempt_label_; 207 Label stack_overflow_label_; 208 Label internal_failure_label_; 209 Label fallback_label_; 210 }; 211 212 // Set of non-volatile registers saved/restored by generated regexp code. 213 const RegList kRegExpCalleeSaved = 214 1 << 25 | 1 << 26 | 1 << 27 | 1 << 28 | 1 << 29 | 1 << 30 | 1 << 31; 215 216 } // namespace internal 217 } // namespace v8 218 219 #endif // V8_REGEXP_PPC_REGEXP_MACRO_ASSEMBLER_PPC_H_ 220