Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 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/arm/assembler-arm.h" |
| 9 | #include "src/macro-assembler.h" |
| 10 | #include "src/regexp/regexp-macro-assembler.h" |
| 11 | |
| 12 | namespace v8 { |
| 13 | namespace internal { |
| 14 | |
| 15 | |
| 16 | #ifndef V8_INTERPRETED_REGEXP |
| 17 | class RegExpMacroAssemblerARM: public NativeRegExpMacroAssembler { |
| 18 | public: |
| 19 | RegExpMacroAssemblerARM(Isolate* isolate, Zone* zone, Mode mode, |
| 20 | int registers_to_save); |
| 21 | virtual ~RegExpMacroAssemblerARM(); |
| 22 | virtual int stack_limit_slack(); |
| 23 | virtual void AdvanceCurrentPosition(int by); |
| 24 | virtual void AdvanceRegister(int reg, int by); |
| 25 | virtual void Backtrack(); |
| 26 | virtual void Bind(Label* label); |
| 27 | virtual void CheckAtStart(Label* on_at_start); |
| 28 | virtual void CheckCharacter(unsigned c, Label* on_equal); |
| 29 | virtual void CheckCharacterAfterAnd(unsigned c, |
| 30 | unsigned mask, |
| 31 | Label* on_equal); |
| 32 | virtual void CheckCharacterGT(uc16 limit, Label* on_greater); |
| 33 | virtual void CheckCharacterLT(uc16 limit, Label* on_less); |
| 34 | // A "greedy loop" is a loop that is both greedy and with a simple |
| 35 | // body. It has a particularly simple implementation. |
| 36 | virtual void CheckGreedyLoop(Label* on_tos_equals_current_position); |
| 37 | virtual void CheckNotAtStart(int cp_offset, Label* on_not_at_start); |
| 38 | virtual void CheckNotBackReference(int start_reg, bool read_backward, |
| 39 | Label* on_no_match); |
| 40 | virtual void CheckNotBackReferenceIgnoreCase(int start_reg, |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 41 | bool read_backward, bool unicode, |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 42 | Label* on_no_match); |
| 43 | virtual void CheckNotCharacter(unsigned c, Label* on_not_equal); |
| 44 | virtual void CheckNotCharacterAfterAnd(unsigned c, |
| 45 | unsigned mask, |
| 46 | Label* on_not_equal); |
| 47 | virtual void CheckNotCharacterAfterMinusAnd(uc16 c, |
| 48 | uc16 minus, |
| 49 | uc16 mask, |
| 50 | Label* on_not_equal); |
| 51 | virtual void CheckCharacterInRange(uc16 from, |
| 52 | uc16 to, |
| 53 | Label* on_in_range); |
| 54 | virtual void CheckCharacterNotInRange(uc16 from, |
| 55 | uc16 to, |
| 56 | Label* on_not_in_range); |
| 57 | virtual void CheckBitInTable(Handle<ByteArray> table, Label* on_bit_set); |
| 58 | |
| 59 | // Checks whether the given offset from the current position is before |
| 60 | // the end of the string. |
| 61 | virtual void CheckPosition(int cp_offset, Label* on_outside_input); |
| 62 | virtual bool CheckSpecialCharacterClass(uc16 type, |
| 63 | Label* on_no_match); |
| 64 | virtual void Fail(); |
| 65 | virtual Handle<HeapObject> GetCode(Handle<String> source); |
| 66 | virtual void GoTo(Label* label); |
| 67 | virtual void IfRegisterGE(int reg, int comparand, Label* if_ge); |
| 68 | virtual void IfRegisterLT(int reg, int comparand, Label* if_lt); |
| 69 | virtual void IfRegisterEqPos(int reg, Label* if_eq); |
| 70 | virtual IrregexpImplementation Implementation(); |
| 71 | virtual void LoadCurrentCharacter(int cp_offset, |
| 72 | Label* on_end_of_input, |
| 73 | bool check_bounds = true, |
| 74 | int characters = 1); |
| 75 | virtual void PopCurrentPosition(); |
| 76 | virtual void PopRegister(int register_index); |
| 77 | virtual void PushBacktrack(Label* label); |
| 78 | virtual void PushCurrentPosition(); |
| 79 | virtual void PushRegister(int register_index, |
| 80 | StackCheckFlag check_stack_limit); |
| 81 | virtual void ReadCurrentPositionFromRegister(int reg); |
| 82 | virtual void ReadStackPointerFromRegister(int reg); |
| 83 | virtual void SetCurrentPositionFromEnd(int by); |
| 84 | virtual void SetRegister(int register_index, int to); |
| 85 | virtual bool Succeed(); |
| 86 | virtual void WriteCurrentPositionToRegister(int reg, int cp_offset); |
| 87 | virtual void ClearRegisters(int reg_from, int reg_to); |
| 88 | virtual void WriteStackPointerToRegister(int reg); |
| 89 | virtual bool CanReadUnaligned(); |
| 90 | |
| 91 | // Called from RegExp if the stack-guard is triggered. |
| 92 | // If the code object is relocated, the return address is fixed before |
| 93 | // returning. |
| 94 | static int CheckStackGuardState(Address* return_address, |
| 95 | Code* re_code, |
| 96 | Address re_frame); |
| 97 | |
| 98 | private: |
| 99 | // Offsets from frame_pointer() of function parameters and stored registers. |
| 100 | static const int kFramePointer = 0; |
| 101 | |
| 102 | // Above the frame pointer - Stored registers and stack passed parameters. |
| 103 | // Register 4..11. |
| 104 | static const int kStoredRegisters = kFramePointer; |
| 105 | // Return address (stored from link register, read into pc on return). |
| 106 | static const int kReturnAddress = kStoredRegisters + 8 * kPointerSize; |
| 107 | static const int kSecondaryReturnAddress = kReturnAddress + kPointerSize; |
| 108 | // Stack parameters placed by caller. |
| 109 | static const int kRegisterOutput = kSecondaryReturnAddress + kPointerSize; |
| 110 | static const int kNumOutputRegisters = kRegisterOutput + kPointerSize; |
| 111 | static const int kStackHighEnd = kNumOutputRegisters + kPointerSize; |
| 112 | static const int kDirectCall = kStackHighEnd + kPointerSize; |
| 113 | static const int kIsolate = kDirectCall + kPointerSize; |
| 114 | |
| 115 | // Below the frame pointer. |
| 116 | // Register parameters stored by setup code. |
| 117 | static const int kInputEnd = kFramePointer - kPointerSize; |
| 118 | static const int kInputStart = kInputEnd - kPointerSize; |
| 119 | static const int kStartIndex = kInputStart - kPointerSize; |
| 120 | static const int kInputString = kStartIndex - kPointerSize; |
| 121 | // When adding local variables remember to push space for them in |
| 122 | // the frame in GetCode. |
| 123 | static const int kSuccessfulCaptures = kInputString - kPointerSize; |
| 124 | static const int kStringStartMinusOne = kSuccessfulCaptures - kPointerSize; |
| 125 | // First register address. Following registers are below it on the stack. |
| 126 | static const int kRegisterZero = kStringStartMinusOne - kPointerSize; |
| 127 | |
| 128 | // Initial size of code buffer. |
| 129 | static const size_t kRegExpCodeSize = 1024; |
| 130 | |
| 131 | static const int kBacktrackConstantPoolSize = 4; |
| 132 | |
| 133 | // Load a number of characters at the given offset from the |
| 134 | // current position, into the current-character register. |
| 135 | void LoadCurrentCharacterUnchecked(int cp_offset, int character_count); |
| 136 | |
| 137 | // Check whether preemption has been requested. |
| 138 | void CheckPreemption(); |
| 139 | |
| 140 | // Check whether we are exceeding the stack limit on the backtrack stack. |
| 141 | void CheckStackLimit(); |
| 142 | |
| 143 | |
| 144 | // Generate a call to CheckStackGuardState. |
| 145 | void CallCheckStackGuardState(Register scratch); |
| 146 | |
| 147 | // The ebp-relative location of a regexp register. |
| 148 | MemOperand register_location(int register_index); |
| 149 | |
| 150 | // Register holding the current input position as negative offset from |
| 151 | // the end of the string. |
| 152 | inline Register current_input_offset() { return r6; } |
| 153 | |
| 154 | // The register containing the current character after LoadCurrentCharacter. |
| 155 | inline Register current_character() { return r7; } |
| 156 | |
| 157 | // Register holding address of the end of the input string. |
| 158 | inline Register end_of_input_address() { return r10; } |
| 159 | |
| 160 | // Register holding the frame address. Local variables, parameters and |
| 161 | // regexp registers are addressed relative to this. |
| 162 | inline Register frame_pointer() { return fp; } |
| 163 | |
| 164 | // The register containing the backtrack stack top. Provides a meaningful |
| 165 | // name to the register. |
| 166 | inline Register backtrack_stackpointer() { return r8; } |
| 167 | |
| 168 | // Register holding pointer to the current code object. |
| 169 | inline Register code_pointer() { return r5; } |
| 170 | |
| 171 | // Byte size of chars in the string to match (decided by the Mode argument) |
| 172 | inline int char_size() { return static_cast<int>(mode_); } |
| 173 | |
| 174 | // Equivalent to a conditional branch to the label, unless the label |
| 175 | // is NULL, in which case it is a conditional Backtrack. |
| 176 | void BranchOrBacktrack(Condition condition, Label* to); |
| 177 | |
| 178 | // Call and return internally in the generated code in a way that |
| 179 | // is GC-safe (i.e., doesn't leave absolute code addresses on the stack) |
| 180 | inline void SafeCall(Label* to, Condition cond = al); |
| 181 | inline void SafeReturn(); |
| 182 | inline void SafeCallTarget(Label* name); |
| 183 | |
| 184 | // Pushes the value of a register on the backtrack stack. Decrements the |
| 185 | // stack pointer by a word size and stores the register's value there. |
| 186 | inline void Push(Register source); |
| 187 | |
| 188 | // Pops a value from the backtrack stack. Reads the word at the stack pointer |
| 189 | // and increments it by a word size. |
| 190 | inline void Pop(Register target); |
| 191 | |
| 192 | Isolate* isolate() const { return masm_->isolate(); } |
| 193 | |
| 194 | MacroAssembler* masm_; |
| 195 | |
| 196 | // Which mode to generate code for (Latin1 or UC16). |
| 197 | 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 | 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 | }; |
| 215 | |
| 216 | #endif // V8_INTERPRETED_REGEXP |
| 217 | |
| 218 | |
| 219 | } // namespace internal |
| 220 | } // namespace v8 |
| 221 | |
| 222 | #endif // V8_REGEXP_ARM_REGEXP_MACRO_ASSEMBLER_ARM_H_ |