1 // Copyright 2012 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_IA32_REGEXP_MACRO_ASSEMBLER_IA32_H_ 6 #define V8_REGEXP_IA32_REGEXP_MACRO_ASSEMBLER_IA32_H_ 7 8 #include "src/base/strings.h" 9 #include "src/codegen/ia32/assembler-ia32.h" 10 #include "src/codegen/macro-assembler.h" 11 #include "src/regexp/regexp-macro-assembler.h" 12 13 namespace v8 { 14 namespace internal { 15 16 class V8_EXPORT_PRIVATE RegExpMacroAssemblerIA32 17 : public NativeRegExpMacroAssembler { 18 public: 19 RegExpMacroAssemblerIA32(Isolate* isolate, Zone* zone, Mode mode, 20 int registers_to_save); 21 ~RegExpMacroAssemblerIA32() override; 22 int stack_limit_slack() override; 23 void AdvanceCurrentPosition(int by) override; 24 void AdvanceRegister(int reg, int by) override; 25 void Backtrack() override; 26 void Bind(Label* label) override; 27 void CheckAtStart(int cp_offset, Label* on_at_start) override; 28 void CheckCharacter(uint32_t c, Label* on_equal) override; 29 void CheckCharacterAfterAnd(uint32_t c, uint32_t mask, 30 Label* on_equal) override; 31 void CheckCharacterGT(base::uc16 limit, Label* on_greater) override; 32 void CheckCharacterLT(base::uc16 limit, Label* on_less) override; 33 // A "greedy loop" is a loop that is both greedy and with a simple 34 // body. It has a particularly simple implementation. 35 void CheckGreedyLoop(Label* on_tos_equals_current_position) override; 36 void CheckNotAtStart(int cp_offset, Label* on_not_at_start) override; 37 void CheckNotBackReference(int start_reg, bool read_backward, 38 Label* on_no_match) override; 39 void CheckNotBackReferenceIgnoreCase(int start_reg, bool read_backward, 40 bool unicode, 41 Label* on_no_match) override; 42 void CheckNotCharacter(uint32_t c, Label* on_not_equal) override; 43 void CheckNotCharacterAfterAnd(uint32_t c, uint32_t mask, 44 Label* on_not_equal) override; 45 void CheckNotCharacterAfterMinusAnd(base::uc16 c, base::uc16 minus, 46 base::uc16 mask, 47 Label* on_not_equal) override; 48 void CheckCharacterInRange(base::uc16 from, base::uc16 to, 49 Label* on_in_range) override; 50 void CheckCharacterNotInRange(base::uc16 from, base::uc16 to, 51 Label* on_not_in_range) override; 52 bool CheckCharacterInRangeArray(const ZoneList<CharacterRange>* ranges, 53 Label* on_in_range) override; 54 bool CheckCharacterNotInRangeArray(const ZoneList<CharacterRange>* ranges, 55 Label* on_not_in_range) override; 56 void CheckBitInTable(Handle<ByteArray> table, Label* on_bit_set) override; 57 58 // Checks whether the given offset from the current position is before 59 // the end of the string. 60 void CheckPosition(int cp_offset, Label* on_outside_input) override; 61 bool CheckSpecialCharacterClass(StandardCharacterSet type, 62 Label* on_no_match) override; 63 void Fail() override; 64 Handle<HeapObject> GetCode(Handle<String> source) override; 65 void GoTo(Label* label) override; 66 void IfRegisterGE(int reg, int comparand, Label* if_ge) override; 67 void IfRegisterLT(int reg, int comparand, Label* if_lt) override; 68 void IfRegisterEqPos(int reg, Label* if_eq) override; 69 IrregexpImplementation Implementation() override; 70 void LoadCurrentCharacterUnchecked(int cp_offset, 71 int character_count) override; 72 void PopCurrentPosition() override; 73 void PopRegister(int register_index) override; 74 void PushBacktrack(Label* label) override; 75 void PushCurrentPosition() override; 76 void PushRegister(int register_index, 77 StackCheckFlag check_stack_limit) override; 78 void ReadCurrentPositionFromRegister(int reg) override; 79 void ReadStackPointerFromRegister(int reg) override; 80 void SetCurrentPositionFromEnd(int by) override; 81 void SetRegister(int register_index, int to) override; 82 bool Succeed() override; 83 void WriteCurrentPositionToRegister(int reg, int cp_offset) override; 84 void ClearRegisters(int reg_from, int reg_to) override; 85 void WriteStackPointerToRegister(int reg) override; 86 87 // Called from RegExp if the stack-guard is triggered. 88 // If the code object is relocated, the return address is fixed before 89 // returning. 90 // {raw_code} is an Address because this is called via ExternalReference. 91 static int CheckStackGuardState(Address* return_address, Address raw_code, 92 Address re_frame); 93 94 private: 95 Operand StaticVariable(const ExternalReference& ext); 96 // Offsets from ebp of function parameters and stored registers. 97 static const int kFramePointer = 0; 98 // Above the frame pointer - function parameters and return address. 99 static const int kReturn_eip = kFramePointer + kSystemPointerSize; 100 static const int kFrameAlign = kReturn_eip + kSystemPointerSize; 101 // Parameters. 102 static const int kInputString = kFrameAlign; 103 static const int kStartIndex = kInputString + kSystemPointerSize; 104 static const int kInputStart = kStartIndex + kSystemPointerSize; 105 static const int kInputEnd = kInputStart + kSystemPointerSize; 106 static const int kRegisterOutput = kInputEnd + kSystemPointerSize; 107 // For the case of global regular expression, we have room to store at least 108 // one set of capture results. For the case of non-global regexp, we ignore 109 // this value. 110 static const int kNumOutputRegisters = kRegisterOutput + kSystemPointerSize; 111 static const int kDirectCall = kNumOutputRegisters + kSystemPointerSize; 112 static const int kIsolate = kDirectCall + kSystemPointerSize; 113 // Below the frame pointer - local stack variables. 114 // When adding local variables remember to push space for them in 115 // the frame in GetCode. 116 static const int kBackup_esi = kFramePointer - kSystemPointerSize; 117 static const int kBackup_edi = kBackup_esi - kSystemPointerSize; 118 static const int kBackup_ebx = kBackup_edi - kSystemPointerSize; 119 static const int kLastCalleeSaveRegister = kBackup_ebx; 120 121 static const int kSuccessfulCaptures = 122 kLastCalleeSaveRegister - kSystemPointerSize; 123 static const int kStringStartMinusOne = 124 kSuccessfulCaptures - kSystemPointerSize; 125 static const int kBacktrackCount = kStringStartMinusOne - kSystemPointerSize; 126 // Stores the initial value of the regexp stack pointer in a 127 // position-independent representation (in case the regexp stack grows and 128 // thus moves). 129 static const int kRegExpStackBasePointer = 130 kBacktrackCount - kSystemPointerSize; 131 // First register address. Following registers are below it on the stack. 132 static const int kRegisterZero = kRegExpStackBasePointer - kSystemPointerSize; 133 134 // Initial size of code buffer. 135 static const int kRegExpCodeSize = 1024; 136 137 void PushCallerSavedRegisters(); 138 void PopCallerSavedRegisters(); 139 140 // Check whether preemption has been requested. 141 void CheckPreemption(); 142 143 // Check whether we are exceeding the stack limit on the backtrack stack. 144 void CheckStackLimit(); 145 146 void CallCheckStackGuardState(Register scratch); 147 void CallIsCharacterInRangeArray(const ZoneList<CharacterRange>* ranges); 148 149 // The ebp-relative location of a regexp register. 150 Operand register_location(int register_index); 151 152 // The register containing the current character after LoadCurrentCharacter. current_character()153 static constexpr Register current_character() { return edx; } 154 155 // The register containing the backtrack stack top. Provides a meaningful 156 // name to the register. backtrack_stackpointer()157 static constexpr Register backtrack_stackpointer() { return ecx; } 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); 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); 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 (ecx) by a word size and stores the register's value there. 174 inline void Push(Register source); 175 176 // Pushes a value on the backtrack stack. Decrements the stack pointer (ecx) 177 // by a word size and stores the value there. 178 inline void Push(Immediate value); 179 180 // Pops a value from the backtrack stack. Reads the word at the stack pointer 181 // (ecx) and increments it by a word size. 182 inline void Pop(Register target); 183 184 void LoadRegExpStackPointerFromMemory(Register dst); 185 void StoreRegExpStackPointerToMemory(Register src, Register scratch); 186 void PushRegExpBasePointer(Register stack_pointer, Register scratch); 187 void PopRegExpBasePointer(Register stack_pointer_out, Register scratch); 188 isolate()189 Isolate* isolate() const { return masm_->isolate(); } 190 191 const std::unique_ptr<MacroAssembler> masm_; 192 const NoRootArrayScope no_root_array_scope_; 193 194 // Which mode to generate code for (LATIN1 or UC16). 195 const Mode mode_; 196 197 // One greater than maximal register index actually used. 198 int num_registers_; 199 200 // Number of registers to output at the end (the saved registers 201 // are always 0..num_saved_registers_-1). 202 const int num_saved_registers_; 203 204 // Labels used internally. 205 Label entry_label_; 206 Label start_label_; 207 Label success_label_; 208 Label backtrack_label_; 209 Label exit_label_; 210 Label check_preempt_label_; 211 Label stack_overflow_label_; 212 Label fallback_label_; 213 }; 214 215 } // namespace internal 216 } // namespace v8 217 218 #endif // V8_REGEXP_IA32_REGEXP_MACRO_ASSEMBLER_IA32_H_ 219