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_ARM_REGEXP_MACRO_ASSEMBLER_ARM_H_ 6 #define V8_REGEXP_ARM_REGEXP_MACRO_ASSEMBLER_ARM_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 RegExpMacroAssemblerARM 15 : public NativeRegExpMacroAssembler { 16 public: 17 RegExpMacroAssemblerARM(Isolate* isolate, Zone* zone, Mode mode, 18 int registers_to_save); 19 ~RegExpMacroAssemblerARM() override; 20 void AbortedCodeGeneration() override; 21 int stack_limit_slack() override; 22 void AdvanceCurrentPosition(int by) override; 23 void AdvanceRegister(int reg, int by) override; 24 void Backtrack() override; 25 void Bind(Label* label) override; 26 void CheckAtStart(int cp_offset, Label* on_at_start) override; 27 void CheckCharacter(unsigned c, Label* on_equal) override; 28 void CheckCharacterAfterAnd(unsigned c, unsigned mask, 29 Label* on_equal) override; 30 void CheckCharacterGT(base::uc16 limit, Label* on_greater) override; 31 void CheckCharacterLT(base::uc16 limit, Label* on_less) override; 32 // A "greedy loop" is a loop that is both greedy and with a simple 33 // body. It has a particularly simple implementation. 34 void CheckGreedyLoop(Label* on_tos_equals_current_position) override; 35 void CheckNotAtStart(int cp_offset, Label* on_not_at_start) override; 36 void CheckNotBackReference(int start_reg, bool read_backward, 37 Label* on_no_match) override; 38 void CheckNotBackReferenceIgnoreCase(int start_reg, bool read_backward, 39 bool unicode, 40 Label* on_no_match) override; 41 void CheckNotCharacter(unsigned c, Label* on_not_equal) override; 42 void CheckNotCharacterAfterAnd(unsigned c, unsigned mask, 43 Label* on_not_equal) override; 44 void CheckNotCharacterAfterMinusAnd(base::uc16 c, base::uc16 minus, 45 base::uc16 mask, 46 Label* on_not_equal) override; 47 void CheckCharacterInRange(base::uc16 from, base::uc16 to, 48 Label* on_in_range) override; 49 void CheckCharacterNotInRange(base::uc16 from, base::uc16 to, 50 Label* on_not_in_range) override; 51 bool CheckCharacterInRangeArray(const ZoneList<CharacterRange>* ranges, 52 Label* on_in_range) override; 53 bool CheckCharacterNotInRangeArray(const ZoneList<CharacterRange>* ranges, 54 Label* on_not_in_range) override; 55 void CheckBitInTable(Handle<ByteArray> table, Label* on_bit_set) override; 56 57 // Checks whether the given offset from the current position is before 58 // the end of the string. 59 void CheckPosition(int cp_offset, Label* on_outside_input) override; 60 bool CheckSpecialCharacterClass(StandardCharacterSet type, 61 Label* on_no_match) override; 62 void Fail() override; 63 Handle<HeapObject> GetCode(Handle<String> source) override; 64 void GoTo(Label* label) override; 65 void IfRegisterGE(int reg, int comparand, Label* if_ge) override; 66 void IfRegisterLT(int reg, int comparand, Label* if_lt) override; 67 void IfRegisterEqPos(int reg, Label* if_eq) override; 68 IrregexpImplementation Implementation() override; 69 void LoadCurrentCharacterUnchecked(int cp_offset, 70 int character_count) override; 71 void PopCurrentPosition() override; 72 void PopRegister(int register_index) override; 73 void PushBacktrack(Label* label) override; 74 void PushCurrentPosition() override; 75 void PushRegister(int register_index, 76 StackCheckFlag check_stack_limit) override; 77 void ReadCurrentPositionFromRegister(int reg) override; 78 void ReadStackPointerFromRegister(int reg) override; 79 void SetCurrentPositionFromEnd(int by) override; 80 void SetRegister(int register_index, int to) override; 81 bool Succeed() override; 82 void WriteCurrentPositionToRegister(int reg, int cp_offset) override; 83 void ClearRegisters(int reg_from, int reg_to) override; 84 void WriteStackPointerToRegister(int reg) 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 + 8 * kPointerSize; 101 // Stack parameters placed by caller. 102 static const int kRegisterOutput = kReturnAddress + kPointerSize; 103 static const int kNumOutputRegisters = kRegisterOutput + kPointerSize; 104 static const int kDirectCall = kNumOutputRegisters + kPointerSize; 105 static const int kIsolate = kDirectCall + kPointerSize; 106 107 // Below the frame pointer. 108 // Register parameters stored by setup code. 109 static const int kInputEnd = kFramePointer - kPointerSize; 110 static const int kInputStart = kInputEnd - kPointerSize; 111 static const int kStartIndex = kInputStart - kPointerSize; 112 static const int kInputString = kStartIndex - kPointerSize; 113 // When adding local variables remember to push space for them in 114 // the frame in GetCode. 115 static const int kSuccessfulCaptures = kInputString - kPointerSize; 116 static const int kStringStartMinusOne = kSuccessfulCaptures - kPointerSize; 117 static const int kBacktrackCount = kStringStartMinusOne - kSystemPointerSize; 118 // Stores the initial value of the regexp stack pointer in a 119 // position-independent representation (in case the regexp stack grows and 120 // thus moves). 121 static const int kRegExpStackBasePointer = 122 kBacktrackCount - kSystemPointerSize; 123 124 // First register address. Following registers are below it on the stack. 125 static const int kRegisterZero = kRegExpStackBasePointer - kSystemPointerSize; 126 127 // Initial size of code buffer. 128 static const int kRegExpCodeSize = 1024; 129 130 static const int kBacktrackConstantPoolSize = 4; 131 132 // Check whether preemption has been requested. 133 void CheckPreemption(); 134 135 // Check whether we are exceeding the stack limit on the backtrack stack. 136 void CheckStackLimit(); 137 138 void CallCheckStackGuardState(); 139 void CallIsCharacterInRangeArray(const ZoneList<CharacterRange>* ranges); 140 141 // The ebp-relative location of a regexp register. 142 MemOperand register_location(int register_index); 143 144 // Register holding the current input position as negative offset from 145 // the end of the string. current_input_offset()146 static constexpr Register current_input_offset() { return r6; } 147 148 // The register containing the current character after LoadCurrentCharacter. current_character()149 static constexpr Register current_character() { return r7; } 150 151 // Register holding address of the end of the input string. end_of_input_address()152 static constexpr Register end_of_input_address() { return r10; } 153 154 // Register holding the frame address. Local variables, parameters and 155 // regexp registers are addressed relative to this. frame_pointer()156 static constexpr Register frame_pointer() { return fp; } 157 158 // The register containing the backtrack stack top. Provides a meaningful 159 // name to the register. backtrack_stackpointer()160 static constexpr Register backtrack_stackpointer() { return r8; } 161 162 // Register holding pointer to the current code object. code_pointer()163 static constexpr Register code_pointer() { return r5; } 164 165 // Byte size of chars in the string to match (decided by the Mode argument) char_size()166 inline int char_size() const { return static_cast<int>(mode_); } 167 168 // Equivalent to a conditional branch to the label, unless the label 169 // is nullptr, in which case it is a conditional Backtrack. 170 void BranchOrBacktrack(Condition condition, Label* to); 171 172 // Call and return internally in the generated code in a way that 173 // is GC-safe (i.e., doesn't leave absolute code addresses on the stack) 174 inline void SafeCall(Label* to, Condition cond = al); 175 inline void SafeReturn(); 176 inline void SafeCallTarget(Label* name); 177 178 // Pushes the value of a register on the backtrack stack. Decrements the 179 // stack pointer by a word size and stores the register's value there. 180 inline void Push(Register source); 181 182 // Pops a value from the backtrack stack. Reads the word at the stack pointer 183 // and increments it by a word size. 184 inline void Pop(Register target); 185 186 void LoadRegExpStackPointerFromMemory(Register dst); 187 void StoreRegExpStackPointerToMemory(Register src, Register scratch); 188 void PushRegExpBasePointer(Register stack_pointer, Register scratch); 189 void PopRegExpBasePointer(Register stack_pointer_out, Register scratch); 190 isolate()191 Isolate* isolate() const { return masm_->isolate(); } 192 193 const std::unique_ptr<MacroAssembler> masm_; 194 const NoRootArrayScope no_root_array_scope_; 195 196 // Which mode to generate code for (Latin1 or UC16). 197 const Mode mode_; 198 199 // One greater than maximal register index actually used. 200 int num_registers_; 201 202 // Number of registers to output at the end (the saved registers 203 // are always 0..num_saved_registers_-1) 204 const int num_saved_registers_; 205 206 // Labels used internally. 207 Label entry_label_; 208 Label start_label_; 209 Label success_label_; 210 Label backtrack_label_; 211 Label exit_label_; 212 Label check_preempt_label_; 213 Label stack_overflow_label_; 214 Label fallback_label_; 215 }; 216 217 } // namespace internal 218 } // namespace v8 219 220 #endif // V8_REGEXP_ARM_REGEXP_MACRO_ASSEMBLER_ARM_H_ 221