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 ~RegExpMacroAssemblerPPC() 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(unsigned c, Label* on_equal) override; 27 void CheckCharacterAfterAnd(unsigned c, unsigned 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 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 + 7 * kSystemPointerSize; 101 static const int kCallerFrame = kReturnAddress + kSystemPointerSize; 102 103 // Below the frame pointer. 104 // Register parameters stored by setup code. 105 static const int kIsolate = kFramePointer - kSystemPointerSize; 106 static const int kDirectCall = kIsolate - kSystemPointerSize; 107 static const int kNumOutputRegisters = kDirectCall - kSystemPointerSize; 108 static const int kRegisterOutput = kNumOutputRegisters - kSystemPointerSize; 109 static const int kInputEnd = kRegisterOutput - kSystemPointerSize; 110 static const int kInputStart = kInputEnd - kSystemPointerSize; 111 static const int kStartIndex = kInputStart - kSystemPointerSize; 112 static const int kInputString = kStartIndex - kSystemPointerSize; 113 // When adding local variables remember to push space for them in 114 // the frame in GetCode. 115 static const int kSuccessfulCaptures = kInputString - kSystemPointerSize; 116 static const int kStringStartMinusOne = 117 kSuccessfulCaptures - kSystemPointerSize; 118 static const int kBacktrackCount = kStringStartMinusOne - kSystemPointerSize; 119 // Stores the initial value of the regexp stack pointer in a 120 // position-independent representation (in case the regexp stack grows and 121 // thus moves). 122 static const int kRegExpStackBasePointer = 123 kBacktrackCount - kSystemPointerSize; 124 125 // First register address. Following registers are below it on the stack. 126 static const int kRegisterZero = kRegExpStackBasePointer - kSystemPointerSize; 127 128 // Initial size of code buffer. 129 static const int kRegExpCodeSize = 1024; 130 131 // Check whether preemption has been requested. 132 void CheckPreemption(); 133 134 // Check whether we are exceeding the stack limit on the backtrack stack. 135 void CheckStackLimit(); 136 137 void CallCheckStackGuardState(Register scratch); 138 void CallIsCharacterInRangeArray(const ZoneList<CharacterRange>* ranges); 139 140 // The ebp-relative location of a regexp register. 141 MemOperand register_location(int register_index); 142 143 // Register holding the current input position as negative offset from 144 // the end of the string. current_input_offset()145 static constexpr Register current_input_offset() { return r27; } 146 147 // The register containing the current character after LoadCurrentCharacter. current_character()148 static constexpr Register current_character() { return r28; } 149 150 // Register holding address of the end of the input string. end_of_input_address()151 static constexpr Register end_of_input_address() { return r30; } 152 153 // Register holding the frame address. Local variables, parameters and 154 // regexp registers are addressed relative to this. frame_pointer()155 static constexpr Register frame_pointer() { return fp; } 156 157 // The register containing the backtrack stack top. Provides a meaningful 158 // name to the register. backtrack_stackpointer()159 static constexpr Register backtrack_stackpointer() { return r29; } 160 161 // Register holding pointer to the current code object. code_pointer()162 static constexpr Register code_pointer() { return r26; } 163 164 // Byte size of chars in the string to match (decided by the Mode argument) char_size()165 inline int char_size() const { return static_cast<int>(mode_); } 166 167 // Equivalent to a conditional branch to the label, unless the label 168 // is nullptr, in which case it is a conditional Backtrack. 169 void BranchOrBacktrack(Condition condition, Label* to, CRegister cr = cr7); 170 171 // Call and return internally in the generated code in a way that 172 // is GC-safe (i.e., doesn't leave absolute code addresses on the stack) 173 inline void SafeCall(Label* to, Condition cond = al, CRegister cr = cr7); 174 inline void SafeReturn(); 175 inline void SafeCallTarget(Label* name); 176 177 // Pushes the value of a register on the backtrack stack. Decrements the 178 // stack pointer by a word size and stores the register's value there. 179 inline void Push(Register source); 180 181 // Pops a value from the backtrack stack. Reads the word at the stack pointer 182 // and increments it by a word size. 183 inline void Pop(Register target); 184 185 void LoadRegExpStackPointerFromMemory(Register dst); 186 void StoreRegExpStackPointerToMemory(Register src, Register scratch); 187 void PushRegExpBasePointer(Register stack_pointer, Register scratch); 188 void PopRegExpBasePointer(Register stack_pointer_out, Register scratch); 189 isolate()190 Isolate* isolate() const { return masm_->isolate(); } 191 192 const std::unique_ptr<MacroAssembler> masm_; 193 const NoRootArrayScope no_root_array_scope_; 194 195 // Which mode to generate code for (Latin1 or UC16). 196 const Mode mode_; 197 198 // One greater than maximal register index actually used. 199 int num_registers_; 200 201 // Number of registers to output at the end (the saved registers 202 // are always 0..num_saved_registers_-1) 203 const int num_saved_registers_; 204 205 // Labels used internally. 206 Label entry_label_; 207 Label start_label_; 208 Label success_label_; 209 Label backtrack_label_; 210 Label exit_label_; 211 Label check_preempt_label_; 212 Label stack_overflow_label_; 213 Label internal_failure_label_; 214 Label fallback_label_; 215 }; 216 217 // Set of non-volatile registers saved/restored by generated regexp code. 218 const RegList kRegExpCalleeSaved = {r25, r26, r27, r28, r29, r30, fp}; 219 220 } // namespace internal 221 } // namespace v8 222 223 #endif // V8_REGEXP_PPC_REGEXP_MACRO_ASSEMBLER_PPC_H_ 224