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1 // Copyright 2013 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_ARM64_REGEXP_MACRO_ASSEMBLER_ARM64_H_ | |
6 #define V8_ARM64_REGEXP_MACRO_ASSEMBLER_ARM64_H_ | |
7 | |
8 #include "src/arm64/assembler-arm64.h" | |
9 #include "src/macro-assembler.h" | |
10 | |
11 namespace v8 { | |
12 namespace internal { | |
13 | |
14 | |
15 #ifndef V8_INTERPRETED_REGEXP | |
16 class RegExpMacroAssemblerARM64: public NativeRegExpMacroAssembler { | |
17 public: | |
18 RegExpMacroAssemblerARM64(Isolate* isolate, Zone* zone, Mode mode, | |
19 int registers_to_save); | |
20 virtual ~RegExpMacroAssemblerARM64(); | |
21 virtual void AbortedCodeGeneration() { masm_->AbortedCodeGeneration(); } | |
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 virtual void CheckCharacters(Vector<const uc16> str, | |
35 int cp_offset, | |
36 Label* on_failure, | |
37 bool check_end_of_string); | |
38 // A "greedy loop" is a loop that is both greedy and with a simple | |
39 // body. It has a particularly simple implementation. | |
40 virtual void CheckGreedyLoop(Label* on_tos_equals_current_position); | |
41 virtual void CheckNotAtStart(Label* on_not_at_start); | |
42 virtual void CheckNotBackReference(int start_reg, Label* on_no_match); | |
43 virtual void CheckNotBackReferenceIgnoreCase(int start_reg, | |
44 Label* on_no_match); | |
45 virtual void CheckNotCharacter(unsigned c, Label* on_not_equal); | |
46 virtual void CheckNotCharacterAfterAnd(unsigned c, | |
47 unsigned mask, | |
48 Label* on_not_equal); | |
49 virtual void CheckNotCharacterAfterMinusAnd(uc16 c, | |
50 uc16 minus, | |
51 uc16 mask, | |
52 Label* on_not_equal); | |
53 virtual void CheckCharacterInRange(uc16 from, | |
54 uc16 to, | |
55 Label* on_in_range); | |
56 virtual void CheckCharacterNotInRange(uc16 from, | |
57 uc16 to, | |
58 Label* on_not_in_range); | |
59 virtual void CheckBitInTable(Handle<ByteArray> table, Label* on_bit_set); | |
60 | |
61 // Checks whether the given offset from the current position is before | |
62 // the end of the string. | |
63 virtual void CheckPosition(int cp_offset, Label* on_outside_input); | |
64 virtual bool CheckSpecialCharacterClass(uc16 type, | |
65 Label* on_no_match); | |
66 virtual void Fail(); | |
67 virtual Handle<HeapObject> GetCode(Handle<String> source); | |
68 virtual void GoTo(Label* label); | |
69 virtual void IfRegisterGE(int reg, int comparand, Label* if_ge); | |
70 virtual void IfRegisterLT(int reg, int comparand, Label* if_lt); | |
71 virtual void IfRegisterEqPos(int reg, Label* if_eq); | |
72 virtual IrregexpImplementation Implementation(); | |
73 virtual void LoadCurrentCharacter(int cp_offset, | |
74 Label* on_end_of_input, | |
75 bool check_bounds = true, | |
76 int characters = 1); | |
77 virtual void PopCurrentPosition(); | |
78 virtual void PopRegister(int register_index); | |
79 virtual void PushBacktrack(Label* label); | |
80 virtual void PushCurrentPosition(); | |
81 virtual void PushRegister(int register_index, | |
82 StackCheckFlag check_stack_limit); | |
83 virtual void ReadCurrentPositionFromRegister(int reg); | |
84 virtual void ReadStackPointerFromRegister(int reg); | |
85 virtual void SetCurrentPositionFromEnd(int by); | |
86 virtual void SetRegister(int register_index, int to); | |
87 virtual bool Succeed(); | |
88 virtual void WriteCurrentPositionToRegister(int reg, int cp_offset); | |
89 virtual void ClearRegisters(int reg_from, int reg_to); | |
90 virtual void WriteStackPointerToRegister(int reg); | |
91 virtual bool CanReadUnaligned(); | |
92 | |
93 // Called from RegExp if the stack-guard is triggered. | |
94 // If the code object is relocated, the return address is fixed before | |
95 // returning. | |
96 static int CheckStackGuardState(Address* return_address, | |
97 Code* re_code, | |
98 Address re_frame, | |
99 int start_offset, | |
100 const byte** input_start, | |
101 const byte** input_end); | |
102 | |
103 private: | |
104 // Above the frame pointer - Stored registers and stack passed parameters. | |
105 // Callee-saved registers x19-x29, where x29 is the old frame pointer. | |
106 static const int kCalleeSavedRegisters = 0; | |
107 // Return address. | |
108 // It is placed above the 11 callee-saved registers. | |
109 static const int kReturnAddress = kCalleeSavedRegisters + 11 * kPointerSize; | |
110 static const int kSecondaryReturnAddress = kReturnAddress + kPointerSize; | |
111 // Stack parameter placed by caller. | |
112 static const int kIsolate = kSecondaryReturnAddress + kPointerSize; | |
113 | |
114 // Below the frame pointer. | |
115 // Register parameters stored by setup code. | |
116 static const int kDirectCall = kCalleeSavedRegisters - kPointerSize; | |
117 static const int kStackBase = kDirectCall - kPointerSize; | |
118 static const int kOutputSize = kStackBase - kPointerSize; | |
119 static const int kInput = kOutputSize - kPointerSize; | |
120 // When adding local variables remember to push space for them in | |
121 // the frame in GetCode. | |
122 static const int kSuccessCounter = kInput - kPointerSize; | |
123 // First position register address on the stack. Following positions are | |
124 // below it. A position is a 32 bit value. | |
125 static const int kFirstRegisterOnStack = kSuccessCounter - kWRegSize; | |
126 // A capture is a 64 bit value holding two position. | |
127 static const int kFirstCaptureOnStack = kSuccessCounter - kXRegSize; | |
128 | |
129 // Initial size of code buffer. | |
130 static const size_t kRegExpCodeSize = 1024; | |
131 | |
132 // When initializing registers to a non-position value we can unroll | |
133 // the loop. Set the limit of registers to unroll. | |
134 static const int kNumRegistersToUnroll = 16; | |
135 | |
136 // We are using x0 to x7 as a register cache. Each hardware register must | |
137 // contain one capture, that is two 32 bit registers. We can cache at most | |
138 // 16 registers. | |
139 static const int kNumCachedRegisters = 16; | |
140 | |
141 // Load a number of characters at the given offset from the | |
142 // current position, into the current-character register. | |
143 void LoadCurrentCharacterUnchecked(int cp_offset, int character_count); | |
144 | |
145 // Check whether preemption has been requested. | |
146 void CheckPreemption(); | |
147 | |
148 // Check whether we are exceeding the stack limit on the backtrack stack. | |
149 void CheckStackLimit(); | |
150 | |
151 // Generate a call to CheckStackGuardState. | |
152 void CallCheckStackGuardState(Register scratch); | |
153 | |
154 // Location of a 32 bit position register. | |
155 MemOperand register_location(int register_index); | |
156 | |
157 // Location of a 64 bit capture, combining two position registers. | |
158 MemOperand capture_location(int register_index, Register scratch); | |
159 | |
160 // Register holding the current input position as negative offset from | |
161 // the end of the string. | |
162 Register current_input_offset() { return w21; } | |
163 | |
164 // The register containing the current character after LoadCurrentCharacter. | |
165 Register current_character() { return w22; } | |
166 | |
167 // Register holding address of the end of the input string. | |
168 Register input_end() { return x25; } | |
169 | |
170 // Register holding address of the start of the input string. | |
171 Register input_start() { return x26; } | |
172 | |
173 // Register holding the offset from the start of the string where we should | |
174 // start matching. | |
175 Register start_offset() { return w27; } | |
176 | |
177 // Pointer to the output array's first element. | |
178 Register output_array() { return x28; } | |
179 | |
180 // Register holding the frame address. Local variables, parameters and | |
181 // regexp registers are addressed relative to this. | |
182 Register frame_pointer() { return fp; } | |
183 | |
184 // The register containing the backtrack stack top. Provides a meaningful | |
185 // name to the register. | |
186 Register backtrack_stackpointer() { return x23; } | |
187 | |
188 // Register holding pointer to the current code object. | |
189 Register code_pointer() { return x20; } | |
190 | |
191 // Register holding the value used for clearing capture registers. | |
192 Register non_position_value() { return w24; } | |
193 // The top 32 bit of this register is used to store this value | |
194 // twice. This is used for clearing more than one register at a time. | |
195 Register twice_non_position_value() { return x24; } | |
196 | |
197 // Byte size of chars in the string to match (decided by the Mode argument) | |
198 int char_size() { return static_cast<int>(mode_); } | |
199 | |
200 // Equivalent to a conditional branch to the label, unless the label | |
201 // is NULL, in which case it is a conditional Backtrack. | |
202 void BranchOrBacktrack(Condition condition, Label* to); | |
203 | |
204 // Compares reg against immmediate before calling BranchOrBacktrack. | |
205 // It makes use of the Cbz and Cbnz instructions. | |
206 void CompareAndBranchOrBacktrack(Register reg, | |
207 int immediate, | |
208 Condition condition, | |
209 Label* to); | |
210 | |
211 inline void CallIf(Label* to, Condition condition); | |
212 | |
213 // Save and restore the link register on the stack in a way that | |
214 // is GC-safe. | |
215 inline void SaveLinkRegister(); | |
216 inline void RestoreLinkRegister(); | |
217 | |
218 // Pushes the value of a register on the backtrack stack. Decrements the | |
219 // stack pointer by a word size and stores the register's value there. | |
220 inline void Push(Register source); | |
221 | |
222 // Pops a value from the backtrack stack. Reads the word at the stack pointer | |
223 // and increments it by a word size. | |
224 inline void Pop(Register target); | |
225 | |
226 // This state indicates where the register actually is. | |
227 enum RegisterState { | |
228 STACKED, // Resides in memory. | |
229 CACHED_LSW, // Least Significant Word of a 64 bit hardware register. | |
230 CACHED_MSW // Most Significant Word of a 64 bit hardware register. | |
231 }; | |
232 | |
233 RegisterState GetRegisterState(int register_index) { | |
234 DCHECK(register_index >= 0); | |
235 if (register_index >= kNumCachedRegisters) { | |
236 return STACKED; | |
237 } else { | |
238 if ((register_index % 2) == 0) { | |
239 return CACHED_LSW; | |
240 } else { | |
241 return CACHED_MSW; | |
242 } | |
243 } | |
244 } | |
245 | |
246 // Store helper that takes the state of the register into account. | |
247 inline void StoreRegister(int register_index, Register source); | |
248 | |
249 // Returns a hardware W register that holds the value of the capture | |
250 // register. | |
251 // | |
252 // This function will try to use an existing cache register (w0-w7) for the | |
253 // result. Otherwise, it will load the value into maybe_result. | |
254 // | |
255 // If the returned register is anything other than maybe_result, calling code | |
256 // must not write to it. | |
257 inline Register GetRegister(int register_index, Register maybe_result); | |
258 | |
259 // Returns the harware register (x0-x7) holding the value of the capture | |
260 // register. | |
261 // This assumes that the state of the register is not STACKED. | |
262 inline Register GetCachedRegister(int register_index); | |
263 | |
264 Isolate* isolate() const { return masm_->isolate(); } | |
265 | |
266 MacroAssembler* masm_; | |
267 | |
268 // Which mode to generate code for (LATIN1 or UC16). | |
269 Mode mode_; | |
270 | |
271 // One greater than maximal register index actually used. | |
272 int num_registers_; | |
273 | |
274 // Number of registers to output at the end (the saved registers | |
275 // are always 0..num_saved_registers_-1) | |
276 int num_saved_registers_; | |
277 | |
278 // Labels used internally. | |
279 Label entry_label_; | |
280 Label start_label_; | |
281 Label success_label_; | |
282 Label backtrack_label_; | |
283 Label exit_label_; | |
284 Label check_preempt_label_; | |
285 Label stack_overflow_label_; | |
286 }; | |
287 | |
288 #endif // V8_INTERPRETED_REGEXP | |
289 | |
290 | |
291 }} // namespace v8::internal | |
292 | |
293 #endif // V8_ARM64_REGEXP_MACRO_ASSEMBLER_ARM64_H_ | |
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