1 // Copyright 2015 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_S390_REGEXP_MACRO_ASSEMBLER_S390_H_ 6 #define V8_REGEXP_S390_REGEXP_MACRO_ASSEMBLER_S390_H_ 7 8 #include "src/macro-assembler.h" 9 #include "src/regexp/regexp-macro-assembler.h" 10 #include "src/s390/assembler-s390.h" 11 12 namespace v8 { 13 namespace internal { 14 15 #ifndef V8_INTERPRETED_REGEXP 16 class RegExpMacroAssemblerS390 : public NativeRegExpMacroAssembler { 17 public: 18 RegExpMacroAssemblerS390(Isolate* isolate, Zone* zone, Mode mode, 19 int registers_to_save); 20 virtual ~RegExpMacroAssemblerS390(); 21 virtual int stack_limit_slack(); 22 virtual void AdvanceCurrentPosition(int by); 23 virtual void AdvanceRegister(int reg, int by); 24 virtual void Backtrack(); 25 virtual void Bind(Label* label); 26 virtual void CheckAtStart(Label* on_at_start); 27 virtual void CheckCharacter(unsigned c, Label* on_equal); 28 virtual void CheckCharacterAfterAnd(unsigned c, unsigned mask, 29 Label* on_equal); 30 virtual void CheckCharacterGT(uc16 limit, Label* on_greater); 31 virtual void CheckCharacterLT(uc16 limit, Label* on_less); 32 // A "greedy loop" is a loop that is both greedy and with a simple 33 // body. It has a particularly simple implementation. 34 virtual void CheckGreedyLoop(Label* on_tos_equals_current_position); 35 virtual void CheckNotAtStart(int cp_offset, Label* on_not_at_start); 36 virtual void CheckNotBackReference(int start_reg, bool read_backward, 37 Label* on_no_match); 38 virtual void CheckNotBackReferenceIgnoreCase(int start_reg, 39 bool read_backward, bool unicode, 40 Label* on_no_match); 41 virtual void CheckNotCharacter(unsigned c, Label* on_not_equal); 42 virtual void CheckNotCharacterAfterAnd(unsigned c, unsigned mask, 43 Label* on_not_equal); 44 virtual void CheckNotCharacterAfterMinusAnd(uc16 c, uc16 minus, uc16 mask, 45 Label* on_not_equal); 46 virtual void CheckCharacterInRange(uc16 from, uc16 to, Label* on_in_range); 47 virtual void CheckCharacterNotInRange(uc16 from, uc16 to, 48 Label* on_not_in_range); 49 virtual void CheckBitInTable(Handle<ByteArray> table, Label* on_bit_set); 50 51 // Checks whether the given offset from the current position is before 52 // the end of the string. 53 virtual void CheckPosition(int cp_offset, Label* on_outside_input); 54 virtual bool CheckSpecialCharacterClass(uc16 type, Label* on_no_match); 55 virtual void Fail(); 56 virtual Handle<HeapObject> GetCode(Handle<String> source); 57 virtual void GoTo(Label* label); 58 virtual void IfRegisterGE(int reg, int comparand, Label* if_ge); 59 virtual void IfRegisterLT(int reg, int comparand, Label* if_lt); 60 virtual void IfRegisterEqPos(int reg, Label* if_eq); 61 virtual IrregexpImplementation Implementation(); 62 virtual void LoadCurrentCharacter(int cp_offset, Label* on_end_of_input, 63 bool check_bounds = true, 64 int characters = 1); 65 virtual void PopCurrentPosition(); 66 virtual void PopRegister(int register_index); 67 virtual void PushBacktrack(Label* label); 68 virtual void PushCurrentPosition(); 69 virtual void PushRegister(int register_index, 70 StackCheckFlag check_stack_limit); 71 virtual void ReadCurrentPositionFromRegister(int reg); 72 virtual void ReadStackPointerFromRegister(int reg); 73 virtual void SetCurrentPositionFromEnd(int by); 74 virtual void SetRegister(int register_index, int to); 75 virtual bool Succeed(); 76 virtual void WriteCurrentPositionToRegister(int reg, int cp_offset); 77 virtual void ClearRegisters(int reg_from, int reg_to); 78 virtual void WriteStackPointerToRegister(int reg); 79 80 // Called from RegExp if the stack-guard is triggered. 81 // If the code object is relocated, the return address is fixed before 82 // returning. 83 static int CheckStackGuardState(Address* return_address, Code* re_code, 84 Address re_frame); 85 86 private: 87 // Offsets from frame_pointer() of function parameters and stored registers. 88 static const int kFramePointer = 0; 89 90 // Above the frame pointer - Stored registers and stack passed parameters. 91 // Register 6-15(sp) 92 static const int kStoredRegisters = kFramePointer; 93 static const int kCallerFrame = 94 kStoredRegisters + kCalleeRegisterSaveAreaSize; 95 // Stack parameters placed by caller. 96 static const int kCaptureArraySize = kCallerFrame; 97 static const int kStackAreaBase = kCallerFrame + kPointerSize; 98 // kDirectCall again 99 static const int kIsolate = kStackAreaBase + 2 * kPointerSize; 100 101 // Below the frame pointer. 102 // Register parameters stored by setup code. 103 static const int kDirectCall = kFramePointer - kPointerSize; 104 static const int kStackHighEnd = kDirectCall - kPointerSize; 105 static const int kNumOutputRegisters = kStackHighEnd - kPointerSize; 106 static const int kRegisterOutput = kNumOutputRegisters - kPointerSize; 107 static const int kInputEnd = kRegisterOutput - kPointerSize; 108 static const int kInputStart = kInputEnd - kPointerSize; 109 static const int kStartIndex = kInputStart - kPointerSize; 110 static const int kInputString = kStartIndex - kPointerSize; 111 // When adding local variables remember to push space for them in 112 // the frame in GetCode. 113 static const int kSuccessfulCaptures = kInputString - kPointerSize; 114 static const int kStringStartMinusOne = kSuccessfulCaptures - kPointerSize; 115 // First register address. Following registers are below it on the stack. 116 static const int kRegisterZero = kStringStartMinusOne - kPointerSize; 117 118 // Initial size of code buffer. 119 static const size_t kRegExpCodeSize = 1024; 120 121 // Load a number of characters at the given offset from the 122 // current position, into the current-character register. 123 void LoadCurrentCharacterUnchecked(int cp_offset, int character_count); 124 125 // Check whether preemption has been requested. 126 void CheckPreemption(); 127 128 // Check whether we are exceeding the stack limit on the backtrack stack. 129 void CheckStackLimit(); 130 void CallCFunctionUsingStub(ExternalReference function, int num_arguments); 131 132 // Generate a call to CheckStackGuardState. 133 void CallCheckStackGuardState(Register scratch); 134 135 // The ebp-relative location of a regexp register. 136 MemOperand register_location(int register_index); 137 138 // Register holding the current input position as negative offset from 139 // the end of the string. current_input_offset()140 inline Register current_input_offset() { return r8; } 141 142 // The register containing the current character after LoadCurrentCharacter. current_character()143 inline Register current_character() { return r9; } 144 145 // Register holding address of the end of the input string. end_of_input_address()146 inline Register end_of_input_address() { return r10; } 147 148 // Register holding the frame address. Local variables, parameters and 149 // regexp registers are addressed relative to this. frame_pointer()150 inline Register frame_pointer() { return fp; } 151 152 // The register containing the backtrack stack top. Provides a meaningful 153 // name to the register. backtrack_stackpointer()154 inline Register backtrack_stackpointer() { return r13; } 155 156 // Register holding pointer to the current code object. code_pointer()157 inline Register code_pointer() { return r7; } 158 159 // Byte size of chars in the string to match (decided by the Mode argument) char_size()160 inline int char_size() { 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, CRegister cr = cr7); 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, Condition cond = al, CRegister cr = cr7); 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 by a word size and stores the register's value there. 174 inline void Push(Register source); 175 176 // Pops a value from the backtrack stack. Reads the word at the stack pointer 177 // and increments it by a word size. 178 inline void Pop(Register target); 179 isolate()180 Isolate* isolate() const { return masm_->isolate(); } 181 182 MacroAssembler* masm_; 183 184 // Which mode to generate code for (Latin1 or UC16). 185 Mode mode_; 186 187 // One greater than maximal register index actually used. 188 int num_registers_; 189 190 // Number of registers to output at the end (the saved registers 191 // are always 0..num_saved_registers_-1) 192 int num_saved_registers_; 193 194 // Labels used internally. 195 Label entry_label_; 196 Label start_label_; 197 Label success_label_; 198 Label backtrack_label_; 199 Label exit_label_; 200 Label check_preempt_label_; 201 Label stack_overflow_label_; 202 Label internal_failure_label_; 203 }; 204 205 // Set of non-volatile registers saved/restored by generated regexp code. 206 const RegList kRegExpCalleeSaved = 207 1 << 6 | 1 << 7 | 1 << 8 | 1 << 9 | 1 << 10 | 1 << 11 | 1 << 13; 208 209 #endif // V8_INTERPRETED_REGEXP 210 } // namespace internal 211 } // namespace v8 212 213 #endif // V8_REGEXP_S390_REGEXP_MACRO_ASSEMBLER_S390_H_ 214