1 // Copyright 2021 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_LOONG64_REGEXP_MACRO_ASSEMBLER_LOONG64_H_ 6 #define V8_REGEXP_LOONG64_REGEXP_MACRO_ASSEMBLER_LOONG64_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 RegExpMacroAssemblerLOONG64 15 : public NativeRegExpMacroAssembler { 16 public: 17 RegExpMacroAssemblerLOONG64(Isolate* isolate, Zone* zone, Mode mode, 18 int registers_to_save); 19 ~RegExpMacroAssemblerLOONG64() 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 85 // Called from RegExp if the stack-guard is triggered. 86 // If the code object is relocated, the return address is fixed before 87 // returning. 88 // {raw_code} is an Address because this is called via ExternalReference. 89 static int64_t CheckStackGuardState(Address* return_address, Address raw_code, 90 Address re_frame); 91 92 void print_regexp_frame_constants(); 93 94 private: 95 // Offsets from frame_pointer() of function parameters and stored registers. 96 static const int kFramePointer = 0; 97 98 // Above the frame pointer - Stored registers and stack passed parameters. 99 static const int kStoredRegisters = kFramePointer; 100 // Return address (stored from link register, read into pc on return). 101 102 // TODO(plind): This 9 - is 8 s-regs (s0..s7) plus fp. 103 104 static const int kReturnAddress = kStoredRegisters + 9 * kSystemPointerSize; 105 // Stack frame header. 106 static const int kStackFrameHeader = kReturnAddress; 107 108 // Below the frame pointer. 109 // Register parameters stored by setup code. 110 static const int kIsolate = kFramePointer - kSystemPointerSize; 111 static const int kDirectCall = kIsolate - kSystemPointerSize; 112 static const int kNumOutputRegisters = kDirectCall - kSystemPointerSize; 113 static const int kRegisterOutput = kNumOutputRegisters - kSystemPointerSize; 114 static const int kInputEnd = kRegisterOutput - kSystemPointerSize; 115 static const int kInputStart = kInputEnd - kSystemPointerSize; 116 static const int kStartIndex = kInputStart - kSystemPointerSize; 117 static const int kInputString = kStartIndex - kSystemPointerSize; 118 // When adding local variables remember to push space for them in 119 // the frame in GetCode. 120 static const int kSuccessfulCaptures = kInputString - kSystemPointerSize; 121 static const int kStringStartMinusOne = 122 kSuccessfulCaptures - kSystemPointerSize; 123 static const int kBacktrackCount = kStringStartMinusOne - kSystemPointerSize; 124 // Stores the initial value of the regexp stack pointer in a 125 // position-independent representation (in case the regexp stack grows and 126 // thus moves). 127 static const int kRegExpStackBasePointer = 128 kBacktrackCount - kSystemPointerSize; 129 130 // First register address. Following registers are below it on the stack. 131 static const int kRegisterZero = kRegExpStackBasePointer - kSystemPointerSize; 132 133 // Initial size of code buffer. 134 static const int kRegExpCodeSize = 1024; 135 136 void PushCallerSavedRegisters(); 137 void PopCallerSavedRegisters(); 138 139 // Check whether preemption has been requested. 140 void CheckPreemption(); 141 142 // Check whether we are exceeding the stack limit on the backtrack stack. 143 void CheckStackLimit(); 144 145 // Generate a call to CheckStackGuardState. 146 void CallCheckStackGuardState(Register scratch); 147 void CallIsCharacterInRangeArray(const ZoneList<CharacterRange>* ranges); 148 149 // The ebp-relative location of a regexp register. 150 MemOperand register_location(int register_index); 151 152 // Register holding the current input position as negative offset from 153 // the end of the string. current_input_offset()154 static constexpr Register current_input_offset() { return s2; } 155 156 // The register containing the current character after LoadCurrentCharacter. current_character()157 static constexpr Register current_character() { return s5; } 158 159 // Register holding address of the end of the input string. end_of_input_address()160 static constexpr Register end_of_input_address() { return s6; } 161 162 // Register holding the frame address. Local variables, parameters and 163 // regexp registers are addressed relative to this. frame_pointer()164 static constexpr Register frame_pointer() { return fp; } 165 166 // The register containing the backtrack stack top. Provides a meaningful 167 // name to the register. backtrack_stackpointer()168 static constexpr Register backtrack_stackpointer() { return s7; } 169 170 // Register holding pointer to the current code object. code_pointer()171 static constexpr Register code_pointer() { return s1; } 172 173 // Byte size of chars in the string to match (decided by the Mode argument). char_size()174 inline int char_size() { return static_cast<int>(mode_); } 175 176 // Equivalent to a conditional branch to the label, unless the label 177 // is nullptr, in which case it is a conditional Backtrack. 178 void BranchOrBacktrack(Label* to, Condition condition, Register rs, 179 const Operand& rt); 180 181 // Call and return internally in the generated code in a way that 182 // is GC-safe (i.e., doesn't leave absolute code addresses on the stack) 183 inline void SafeCall(Label* to, Condition cond, 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() const201 Isolate* isolate() const { return masm_->isolate(); } 202 203 const std::unique_ptr<MacroAssembler> masm_; 204 205 const NoRootArrayScope no_root_array_scope_; 206 207 // Which mode to generate code for (Latin1 or UC16). 208 const Mode mode_; 209 210 // One greater than maximal register index actually used. 211 int num_registers_; 212 213 // Number of registers to output at the end (the saved registers 214 // are always 0..num_saved_registers_-1). 215 const int num_saved_registers_; 216 217 // Labels used internally. 218 Label entry_label_; 219 Label start_label_; 220 Label success_label_; 221 Label backtrack_label_; 222 Label exit_label_; 223 Label check_preempt_label_; 224 Label stack_overflow_label_; 225 Label internal_failure_label_; 226 Label fallback_label_; 227 }; 228 229 } // namespace internal 230 } // namespace v8 231 232 #endif // V8_REGEXP_LOONG64_REGEXP_MACRO_ASSEMBLER_LOONG64_H_ 233