1 // Copyright 2011 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_MIPS_REGEXP_MACRO_ASSEMBLER_MIPS_H_ 6 #define V8_REGEXP_MIPS_REGEXP_MACRO_ASSEMBLER_MIPS_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 RegExpMacroAssemblerMIPS 15 : public NativeRegExpMacroAssembler { 16 public: 17 RegExpMacroAssemblerMIPS(Isolate* isolate, Zone* zone, Mode mode, 18 int registers_to_save); 19 ~RegExpMacroAssemblerMIPS() override; 20 int stack_limit_slack() override; 21 void AdvanceCurrentPosition(int by) override; 22 void AdvanceRegister(int reg, int by) override; 23 void Backtrack() override; 24 void Bind(Label* label) override; 25 void CheckAtStart(int cp_offset, Label* on_at_start) override; 26 void CheckCharacter(uint32_t c, Label* on_equal) override; 27 void CheckCharacterAfterAnd(uint32_t c, uint32_t mask, 28 Label* on_equal) override; 29 void CheckCharacterGT(base::uc16 limit, Label* on_greater) override; 30 void CheckCharacterLT(base::uc16 limit, Label* on_less) override; 31 // A "greedy loop" is a loop that is both greedy and with a simple 32 // body. It has a particularly simple implementation. 33 void CheckGreedyLoop(Label* on_tos_equals_current_position) override; 34 void CheckNotAtStart(int cp_offset, Label* on_not_at_start) override; 35 void CheckNotBackReference(int start_reg, bool read_backward, 36 Label* on_no_match) override; 37 void CheckNotBackReferenceIgnoreCase(int start_reg, bool read_backward, 38 bool unicode, 39 Label* on_no_match) override; 40 void CheckNotCharacter(uint32_t c, Label* on_not_equal) override; 41 void CheckNotCharacterAfterAnd(uint32_t c, uint32_t mask, 42 Label* on_not_equal) override; 43 void CheckNotCharacterAfterMinusAnd(base::uc16 c, base::uc16 minus, 44 base::uc16 mask, 45 Label* on_not_equal) override; 46 void CheckCharacterInRange(base::uc16 from, base::uc16 to, 47 Label* on_in_range) override; 48 void CheckCharacterNotInRange(base::uc16 from, base::uc16 to, 49 Label* on_not_in_range) override; 50 bool CheckCharacterInRangeArray(const ZoneList<CharacterRange>* ranges, 51 Label* on_in_range) override; 52 bool CheckCharacterNotInRangeArray(const ZoneList<CharacterRange>* ranges, 53 Label* on_not_in_range) override; 54 void CheckBitInTable(Handle<ByteArray> table, Label* on_bit_set) override; 55 56 // Checks whether the given offset from the current position is before 57 // the end of the string. 58 void CheckPosition(int cp_offset, Label* on_outside_input) override; 59 bool CheckSpecialCharacterClass(StandardCharacterSet type, 60 Label* on_no_match) override; 61 void Fail() override; 62 Handle<HeapObject> GetCode(Handle<String> source) override; 63 void GoTo(Label* label) override; 64 void IfRegisterGE(int reg, int comparand, Label* if_ge) override; 65 void IfRegisterLT(int reg, int comparand, Label* if_lt) override; 66 void IfRegisterEqPos(int reg, Label* if_eq) override; 67 IrregexpImplementation Implementation() override; 68 void LoadCurrentCharacterUnchecked(int cp_offset, 69 int character_count) override; 70 void PopCurrentPosition() override; 71 void PopRegister(int register_index) override; 72 void PushBacktrack(Label* label) override; 73 void PushCurrentPosition() override; 74 void PushRegister(int register_index, 75 StackCheckFlag check_stack_limit) override; 76 void ReadCurrentPositionFromRegister(int reg) override; 77 void ReadStackPointerFromRegister(int reg) override; 78 void SetCurrentPositionFromEnd(int by) override; 79 void SetRegister(int register_index, int to) override; 80 bool Succeed() override; 81 void WriteCurrentPositionToRegister(int reg, int cp_offset) override; 82 void ClearRegisters(int reg_from, int reg_to) override; 83 void WriteStackPointerToRegister(int reg) override; 84 bool CanReadUnaligned() const override; 85 86 // Called from RegExp if the stack-guard is triggered. 87 // If the code object is relocated, the return address is fixed before 88 // returning. 89 // {raw_code} is an Address because this is called via ExternalReference. 90 static int CheckStackGuardState(Address* return_address, Address raw_code, 91 Address re_frame); 92 93 private: 94 // Offsets from frame_pointer() of function parameters and stored registers. 95 static const int kFramePointer = 0; 96 97 // Above the frame pointer - Stored registers and stack passed parameters. 98 static const int kStoredRegisters = kFramePointer; 99 // Return address (stored from link register, read into pc on return). 100 static const int kReturnAddress = kStoredRegisters + 9 * kPointerSize; 101 // Stack frame header. 102 static const int kStackFrameHeader = kReturnAddress; 103 // Stack parameters placed by caller. 104 static const int kRegisterOutput = kStackFrameHeader + 20; 105 static const int kNumOutputRegisters = kRegisterOutput + kPointerSize; 106 static const int kDirectCall = kNumOutputRegisters + kPointerSize; 107 static const int kIsolate = kDirectCall + kPointerSize; 108 109 // Below the frame pointer. 110 // Register parameters stored by setup code. 111 static const int kInputEnd = kFramePointer - kPointerSize; 112 static const int kInputStart = kInputEnd - kPointerSize; 113 static const int kStartIndex = kInputStart - kPointerSize; 114 static const int kInputString = kStartIndex - kPointerSize; 115 // When adding local variables remember to push space for them in 116 // the frame in GetCode. 117 static const int kSuccessfulCaptures = kInputString - kPointerSize; 118 static const int kStringStartMinusOne = kSuccessfulCaptures - kPointerSize; 119 static const int kBacktrackCount = kStringStartMinusOne - kSystemPointerSize; 120 // Stores the initial value of the regexp stack pointer in a 121 // position-independent representation (in case the regexp stack grows and 122 // thus moves). 123 static const int kRegExpStackBasePointer = 124 kBacktrackCount - kSystemPointerSize; 125 126 // First register address. Following registers are below it on the stack. 127 static const int kRegisterZero = kRegExpStackBasePointer - kSystemPointerSize; 128 129 // Initial size of code buffer. 130 static const int kRegExpCodeSize = 1024; 131 132 void PushCallerSavedRegisters(); 133 void PopCallerSavedRegisters(); 134 135 // Check whether preemption has been requested. 136 void CheckPreemption(); 137 138 // Check whether we are exceeding the stack limit on the backtrack stack. 139 void CheckStackLimit(); 140 141 // Generate a call to CheckStackGuardState. 142 void CallCheckStackGuardState(Register scratch); 143 void CallIsCharacterInRangeArray(const ZoneList<CharacterRange>* ranges); 144 145 // The ebp-relative location of a regexp register. 146 MemOperand register_location(int register_index); 147 148 // Register holding the current input position as negative offset from 149 // the end of the string. current_input_offset()150 static constexpr Register current_input_offset() { return s2; } 151 152 // The register containing the current character after LoadCurrentCharacter. current_character()153 static constexpr Register current_character() { return s5; } 154 155 // Register holding address of the end of the input string. end_of_input_address()156 static constexpr Register end_of_input_address() { return s6; } 157 158 // Register holding the frame address. Local variables, parameters and 159 // regexp registers are addressed relative to this. frame_pointer()160 static constexpr Register frame_pointer() { return fp; } 161 162 // The register containing the backtrack stack top. Provides a meaningful 163 // name to the register. backtrack_stackpointer()164 static constexpr Register backtrack_stackpointer() { return s7; } 165 166 // Register holding pointer to the current code object. code_pointer()167 static constexpr Register code_pointer() { return s1; } 168 169 // Byte size of chars in the string to match (decided by the Mode argument). char_size()170 inline int char_size() const { return static_cast<int>(mode_); } 171 172 // Equivalent to a conditional branch to the label, unless the label 173 // is nullptr, in which case it is a conditional Backtrack. 174 void BranchOrBacktrack(Label* to, 175 Condition condition, 176 Register rs, 177 const Operand& rt); 178 179 // Call and return internally in the generated code in a way that 180 // is GC-safe (i.e., doesn't leave absolute code addresses on the stack) 181 inline void SafeCall(Label* to, 182 Condition cond, 183 Register rs, 184 const Operand& rt); 185 inline void SafeReturn(); 186 inline void SafeCallTarget(Label* name); 187 188 // Pushes the value of a register on the backtrack stack. Decrements the 189 // stack pointer by a word size and stores the register's value there. 190 inline void Push(Register source); 191 192 // Pops a value from the backtrack stack. Reads the word at the stack pointer 193 // and increments it by a word size. 194 inline void Pop(Register target); 195 196 void LoadRegExpStackPointerFromMemory(Register dst); 197 void StoreRegExpStackPointerToMemory(Register src, Register scratch); 198 void PushRegExpBasePointer(Register stack_pointer, Register scratch); 199 void PopRegExpBasePointer(Register stack_pointer_out, Register scratch); 200 isolate()201 Isolate* isolate() const { return masm_->isolate(); } 202 203 const std::unique_ptr<MacroAssembler> masm_; 204 const NoRootArrayScope no_root_array_scope_; 205 206 // Which mode to generate code for (Latin1 or UC16). 207 const Mode mode_; 208 209 // One greater than maximal register index actually used. 210 int num_registers_; 211 212 // Number of registers to output at the end (the saved registers 213 // are always 0..num_saved_registers_-1). 214 const int num_saved_registers_; 215 216 // Labels used internally. 217 Label entry_label_; 218 Label start_label_; 219 Label success_label_; 220 Label backtrack_label_; 221 Label exit_label_; 222 Label check_preempt_label_; 223 Label stack_overflow_label_; 224 Label internal_failure_label_; 225 Label fallback_label_; 226 }; 227 228 } // namespace internal 229 } // namespace v8 230 231 #endif // V8_REGEXP_MIPS_REGEXP_MACRO_ASSEMBLER_MIPS_H_ 232