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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_X64_REGEXP_MACRO_ASSEMBLER_X64_H_ | |
6 #define V8_X64_REGEXP_MACRO_ASSEMBLER_X64_H_ | |
7 | |
8 #include "src/macro-assembler.h" | |
9 #include "src/x64/assembler-x64.h" | |
10 #include "src/x64/macro-assembler-x64.h" | |
11 | |
12 namespace v8 { | |
13 namespace internal { | |
14 | |
15 #ifndef V8_INTERPRETED_REGEXP | |
16 | |
17 class RegExpMacroAssemblerX64: public NativeRegExpMacroAssembler { | |
18 public: | |
19 RegExpMacroAssemblerX64(Isolate* isolate, Zone* zone, Mode mode, | |
20 int registers_to_save); | |
21 virtual ~RegExpMacroAssemblerX64(); | |
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(uint32_t c, Label* on_equal); | |
29 virtual void CheckCharacterAfterAnd(uint32_t c, | |
30 uint32_t 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(Label* on_not_at_start); | |
38 virtual void CheckNotBackReference(int start_reg, Label* on_no_match); | |
39 virtual void CheckNotBackReferenceIgnoreCase(int start_reg, | |
40 Label* on_no_match); | |
41 virtual void CheckNotCharacter(uint32_t c, Label* on_not_equal); | |
42 virtual void CheckNotCharacterAfterAnd(uint32_t c, | |
43 uint32_t mask, | |
44 Label* on_not_equal); | |
45 virtual void CheckNotCharacterAfterMinusAnd(uc16 c, | |
46 uc16 minus, | |
47 uc16 mask, | |
48 Label* on_not_equal); | |
49 virtual void CheckCharacterInRange(uc16 from, | |
50 uc16 to, | |
51 Label* on_in_range); | |
52 virtual void CheckCharacterNotInRange(uc16 from, | |
53 uc16 to, | |
54 Label* on_not_in_range); | |
55 virtual void CheckBitInTable(Handle<ByteArray> table, Label* on_bit_set); | |
56 | |
57 // Checks whether the given offset from the current position is before | |
58 // the end of the string. | |
59 virtual void CheckPosition(int cp_offset, Label* on_outside_input); | |
60 virtual bool CheckSpecialCharacterClass(uc16 type, | |
61 Label* on_no_match); | |
62 virtual void Fail(); | |
63 virtual Handle<HeapObject> GetCode(Handle<String> source); | |
64 virtual void GoTo(Label* label); | |
65 virtual void IfRegisterGE(int reg, int comparand, Label* if_ge); | |
66 virtual void IfRegisterLT(int reg, int comparand, Label* if_lt); | |
67 virtual void IfRegisterEqPos(int reg, Label* if_eq); | |
68 virtual IrregexpImplementation Implementation(); | |
69 virtual void LoadCurrentCharacter(int cp_offset, | |
70 Label* on_end_of_input, | |
71 bool check_bounds = true, | |
72 int characters = 1); | |
73 virtual void PopCurrentPosition(); | |
74 virtual void PopRegister(int register_index); | |
75 virtual void PushBacktrack(Label* label); | |
76 virtual void PushCurrentPosition(); | |
77 virtual void PushRegister(int register_index, | |
78 StackCheckFlag check_stack_limit); | |
79 virtual void ReadCurrentPositionFromRegister(int reg); | |
80 virtual void ReadStackPointerFromRegister(int reg); | |
81 virtual void SetCurrentPositionFromEnd(int by); | |
82 virtual void SetRegister(int register_index, int to); | |
83 virtual bool Succeed(); | |
84 virtual void WriteCurrentPositionToRegister(int reg, int cp_offset); | |
85 virtual void ClearRegisters(int reg_from, int reg_to); | |
86 virtual void WriteStackPointerToRegister(int reg); | |
87 | |
88 static Result Match(Handle<Code> regexp, | |
89 Handle<String> subject, | |
90 int* offsets_vector, | |
91 int offsets_vector_length, | |
92 int previous_index, | |
93 Isolate* isolate); | |
94 | |
95 static Result Execute(Code* code, | |
96 String* input, | |
97 int start_offset, | |
98 const byte* input_start, | |
99 const byte* input_end, | |
100 int* output, | |
101 bool at_start); | |
102 | |
103 // Called from RegExp if the stack-guard is triggered. | |
104 // If the code object is relocated, the return address is fixed before | |
105 // returning. | |
106 static int CheckStackGuardState(Address* return_address, | |
107 Code* re_code, | |
108 Address re_frame); | |
109 | |
110 private: | |
111 // Offsets from rbp of function parameters and stored registers. | |
112 static const int kFramePointer = 0; | |
113 // Above the frame pointer - function parameters and return address. | |
114 static const int kReturn_eip = kFramePointer + kRegisterSize; | |
115 static const int kFrameAlign = kReturn_eip + kRegisterSize; | |
116 | |
117 #ifdef _WIN64 | |
118 // Parameters (first four passed as registers, but with room on stack). | |
119 // In Microsoft 64-bit Calling Convention, there is room on the callers | |
120 // stack (before the return address) to spill parameter registers. We | |
121 // use this space to store the register passed parameters. | |
122 static const int kInputString = kFrameAlign; | |
123 // StartIndex is passed as 32 bit int. | |
124 static const int kStartIndex = kInputString + kRegisterSize; | |
125 static const int kInputStart = kStartIndex + kRegisterSize; | |
126 static const int kInputEnd = kInputStart + kRegisterSize; | |
127 static const int kRegisterOutput = kInputEnd + kRegisterSize; | |
128 // For the case of global regular expression, we have room to store at least | |
129 // one set of capture results. For the case of non-global regexp, we ignore | |
130 // this value. NumOutputRegisters is passed as 32-bit value. The upper | |
131 // 32 bit of this 64-bit stack slot may contain garbage. | |
132 static const int kNumOutputRegisters = kRegisterOutput + kRegisterSize; | |
133 static const int kStackHighEnd = kNumOutputRegisters + kRegisterSize; | |
134 // DirectCall is passed as 32 bit int (values 0 or 1). | |
135 static const int kDirectCall = kStackHighEnd + kRegisterSize; | |
136 static const int kIsolate = kDirectCall + kRegisterSize; | |
137 #else | |
138 // In AMD64 ABI Calling Convention, the first six integer parameters | |
139 // are passed as registers, and caller must allocate space on the stack | |
140 // if it wants them stored. We push the parameters after the frame pointer. | |
141 static const int kInputString = kFramePointer - kRegisterSize; | |
142 static const int kStartIndex = kInputString - kRegisterSize; | |
143 static const int kInputStart = kStartIndex - kRegisterSize; | |
144 static const int kInputEnd = kInputStart - kRegisterSize; | |
145 static const int kRegisterOutput = kInputEnd - kRegisterSize; | |
146 | |
147 // For the case of global regular expression, we have room to store at least | |
148 // one set of capture results. For the case of non-global regexp, we ignore | |
149 // this value. | |
150 static const int kNumOutputRegisters = kRegisterOutput - kRegisterSize; | |
151 static const int kStackHighEnd = kFrameAlign; | |
152 static const int kDirectCall = kStackHighEnd + kRegisterSize; | |
153 static const int kIsolate = kDirectCall + kRegisterSize; | |
154 #endif | |
155 | |
156 #ifdef _WIN64 | |
157 // Microsoft calling convention has three callee-saved registers | |
158 // (that we are using). We push these after the frame pointer. | |
159 static const int kBackup_rsi = kFramePointer - kRegisterSize; | |
160 static const int kBackup_rdi = kBackup_rsi - kRegisterSize; | |
161 static const int kBackup_rbx = kBackup_rdi - kRegisterSize; | |
162 static const int kLastCalleeSaveRegister = kBackup_rbx; | |
163 #else | |
164 // AMD64 Calling Convention has only one callee-save register that | |
165 // we use. We push this after the frame pointer (and after the | |
166 // parameters). | |
167 static const int kBackup_rbx = kNumOutputRegisters - kRegisterSize; | |
168 static const int kLastCalleeSaveRegister = kBackup_rbx; | |
169 #endif | |
170 | |
171 static const int kSuccessfulCaptures = kLastCalleeSaveRegister - kPointerSize; | |
172 // When adding local variables remember to push space for them in | |
173 // the frame in GetCode. | |
174 static const int kInputStartMinusOne = kSuccessfulCaptures - kPointerSize; | |
175 | |
176 // First register address. Following registers are below it on the stack. | |
177 static const int kRegisterZero = kInputStartMinusOne - kPointerSize; | |
178 | |
179 // Initial size of code buffer. | |
180 static const size_t kRegExpCodeSize = 1024; | |
181 | |
182 // Load a number of characters at the given offset from the | |
183 // current position, into the current-character register. | |
184 void LoadCurrentCharacterUnchecked(int cp_offset, int character_count); | |
185 | |
186 // Check whether preemption has been requested. | |
187 void CheckPreemption(); | |
188 | |
189 // Check whether we are exceeding the stack limit on the backtrack stack. | |
190 void CheckStackLimit(); | |
191 | |
192 // Generate a call to CheckStackGuardState. | |
193 void CallCheckStackGuardState(); | |
194 | |
195 // The rbp-relative location of a regexp register. | |
196 Operand register_location(int register_index); | |
197 | |
198 // The register containing the current character after LoadCurrentCharacter. | |
199 inline Register current_character() { return rdx; } | |
200 | |
201 // The register containing the backtrack stack top. Provides a meaningful | |
202 // name to the register. | |
203 inline Register backtrack_stackpointer() { return rcx; } | |
204 | |
205 // The registers containing a self pointer to this code's Code object. | |
206 inline Register code_object_pointer() { return r8; } | |
207 | |
208 // Byte size of chars in the string to match (decided by the Mode argument) | |
209 inline int char_size() { return static_cast<int>(mode_); } | |
210 | |
211 // Equivalent to a conditional branch to the label, unless the label | |
212 // is NULL, in which case it is a conditional Backtrack. | |
213 void BranchOrBacktrack(Condition condition, Label* to); | |
214 | |
215 void MarkPositionForCodeRelativeFixup() { | |
216 code_relative_fixup_positions_.Add(masm_.pc_offset(), zone()); | |
217 } | |
218 | |
219 void FixupCodeRelativePositions(); | |
220 | |
221 // Call and return internally in the generated code in a way that | |
222 // is GC-safe (i.e., doesn't leave absolute code addresses on the stack) | |
223 inline void SafeCall(Label* to); | |
224 inline void SafeCallTarget(Label* label); | |
225 inline void SafeReturn(); | |
226 | |
227 // Pushes the value of a register on the backtrack stack. Decrements the | |
228 // stack pointer (rcx) by a word size and stores the register's value there. | |
229 inline void Push(Register source); | |
230 | |
231 // Pushes a value on the backtrack stack. Decrements the stack pointer (rcx) | |
232 // by a word size and stores the value there. | |
233 inline void Push(Immediate value); | |
234 | |
235 // Pushes the Code object relative offset of a label on the backtrack stack | |
236 // (i.e., a backtrack target). Decrements the stack pointer (rcx) | |
237 // by a word size and stores the value there. | |
238 inline void Push(Label* label); | |
239 | |
240 // Pops a value from the backtrack stack. Reads the word at the stack pointer | |
241 // (rcx) and increments it by a word size. | |
242 inline void Pop(Register target); | |
243 | |
244 // Drops the top value from the backtrack stack without reading it. | |
245 // Increments the stack pointer (rcx) by a word size. | |
246 inline void Drop(); | |
247 | |
248 inline void ReadPositionFromRegister(Register dst, int reg); | |
249 | |
250 Isolate* isolate() const { return masm_.isolate(); } | |
251 | |
252 MacroAssembler masm_; | |
253 MacroAssembler::NoRootArrayScope no_root_array_scope_; | |
254 | |
255 ZoneList<int> code_relative_fixup_positions_; | |
256 | |
257 // Which mode to generate code for (LATIN1 or UC16). | |
258 Mode mode_; | |
259 | |
260 // One greater than maximal register index actually used. | |
261 int num_registers_; | |
262 | |
263 // Number of registers to output at the end (the saved registers | |
264 // are always 0..num_saved_registers_-1) | |
265 int num_saved_registers_; | |
266 | |
267 // Labels used internally. | |
268 Label entry_label_; | |
269 Label start_label_; | |
270 Label success_label_; | |
271 Label backtrack_label_; | |
272 Label exit_label_; | |
273 Label check_preempt_label_; | |
274 Label stack_overflow_label_; | |
275 }; | |
276 | |
277 #endif // V8_INTERPRETED_REGEXP | |
278 | |
279 }} // namespace v8::internal | |
280 | |
281 #endif // V8_X64_REGEXP_MACRO_ASSEMBLER_X64_H_ | |
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