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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_REGEXP_X64_REGEXP_MACRO_ASSEMBLER_X64_H_
6 : #define V8_REGEXP_X64_REGEXP_MACRO_ASSEMBLER_X64_H_
7 :
8 : #include "src/macro-assembler.h"
9 : #include "src/regexp/regexp-macro-assembler.h"
10 : #include "src/x64/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(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,
41 : bool read_backward, bool unicode,
42 : Label* on_no_match);
43 : virtual void CheckNotCharacter(uint32_t c, Label* on_not_equal);
44 : virtual void CheckNotCharacterAfterAnd(uint32_t c,
45 : uint32_t 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 :
90 : static Result Match(Handle<Code> regexp,
91 : Handle<String> subject,
92 : int* offsets_vector,
93 : int offsets_vector_length,
94 : int previous_index,
95 : Isolate* isolate);
96 :
97 : static Result Execute(Code* code,
98 : String* input,
99 : int start_offset,
100 : const byte* input_start,
101 : const byte* input_end,
102 : int* output,
103 : bool at_start);
104 :
105 : // Called from RegExp if the stack-guard is triggered.
106 : // If the code object is relocated, the return address is fixed before
107 : // returning.
108 : static int CheckStackGuardState(Address* return_address,
109 : Code* re_code,
110 : Address re_frame);
111 :
112 : private:
113 : // Offsets from rbp of function parameters and stored registers.
114 : static const int kFramePointer = 0;
115 : // Above the frame pointer - function parameters and return address.
116 : static const int kReturn_eip = kFramePointer + kRegisterSize;
117 : static const int kFrameAlign = kReturn_eip + kRegisterSize;
118 :
119 : #ifdef _WIN64
120 : // Parameters (first four passed as registers, but with room on stack).
121 : // In Microsoft 64-bit Calling Convention, there is room on the callers
122 : // stack (before the return address) to spill parameter registers. We
123 : // use this space to store the register passed parameters.
124 : static const int kInputString = kFrameAlign;
125 : // StartIndex is passed as 32 bit int.
126 : static const int kStartIndex = kInputString + kRegisterSize;
127 : static const int kInputStart = kStartIndex + kRegisterSize;
128 : static const int kInputEnd = kInputStart + kRegisterSize;
129 : static const int kRegisterOutput = kInputEnd + kRegisterSize;
130 : // For the case of global regular expression, we have room to store at least
131 : // one set of capture results. For the case of non-global regexp, we ignore
132 : // this value. NumOutputRegisters is passed as 32-bit value. The upper
133 : // 32 bit of this 64-bit stack slot may contain garbage.
134 : static const int kNumOutputRegisters = kRegisterOutput + kRegisterSize;
135 : static const int kStackHighEnd = kNumOutputRegisters + kRegisterSize;
136 : // DirectCall is passed as 32 bit int (values 0 or 1).
137 : static const int kDirectCall = kStackHighEnd + kRegisterSize;
138 : static const int kIsolate = kDirectCall + kRegisterSize;
139 : #else
140 : // In AMD64 ABI Calling Convention, the first six integer parameters
141 : // are passed as registers, and caller must allocate space on the stack
142 : // if it wants them stored. We push the parameters after the frame pointer.
143 : static const int kInputString = kFramePointer - kRegisterSize;
144 : static const int kStartIndex = kInputString - kRegisterSize;
145 : static const int kInputStart = kStartIndex - kRegisterSize;
146 : static const int kInputEnd = kInputStart - kRegisterSize;
147 : static const int kRegisterOutput = kInputEnd - kRegisterSize;
148 :
149 : // For the case of global regular expression, we have room to store at least
150 : // one set of capture results. For the case of non-global regexp, we ignore
151 : // this value.
152 : static const int kNumOutputRegisters = kRegisterOutput - kRegisterSize;
153 : static const int kStackHighEnd = kFrameAlign;
154 : static const int kDirectCall = kStackHighEnd + kRegisterSize;
155 : static const int kIsolate = kDirectCall + kRegisterSize;
156 : #endif
157 :
158 : #ifdef _WIN64
159 : // Microsoft calling convention has three callee-saved registers
160 : // (that we are using). We push these after the frame pointer.
161 : static const int kBackup_rsi = kFramePointer - kRegisterSize;
162 : static const int kBackup_rdi = kBackup_rsi - kRegisterSize;
163 : static const int kBackup_rbx = kBackup_rdi - kRegisterSize;
164 : static const int kLastCalleeSaveRegister = kBackup_rbx;
165 : #else
166 : // AMD64 Calling Convention has only one callee-save register that
167 : // we use. We push this after the frame pointer (and after the
168 : // parameters).
169 : static const int kBackup_rbx = kNumOutputRegisters - kRegisterSize;
170 : static const int kLastCalleeSaveRegister = kBackup_rbx;
171 : #endif
172 :
173 : static const int kSuccessfulCaptures = kLastCalleeSaveRegister - kPointerSize;
174 : // When adding local variables remember to push space for them in
175 : // the frame in GetCode.
176 : static const int kStringStartMinusOne = kSuccessfulCaptures - kPointerSize;
177 :
178 : // First register address. Following registers are below it on the stack.
179 : static const int kRegisterZero = kStringStartMinusOne - kPointerSize;
180 :
181 : // Initial size of code buffer.
182 : static const size_t kRegExpCodeSize = 1024;
183 :
184 : // Load a number of characters at the given offset from the
185 : // current position, into the current-character register.
186 : void LoadCurrentCharacterUnchecked(int cp_offset, int character_count);
187 :
188 : // Check whether preemption has been requested.
189 : void CheckPreemption();
190 :
191 : // Check whether we are exceeding the stack limit on the backtrack stack.
192 : void CheckStackLimit();
193 :
194 : // Generate a call to CheckStackGuardState.
195 : void CallCheckStackGuardState();
196 :
197 : // The rbp-relative location of a regexp register.
198 : Operand register_location(int register_index);
199 :
200 : // The register containing the current character after LoadCurrentCharacter.
201 : inline Register current_character() { return rdx; }
202 :
203 : // The register containing the backtrack stack top. Provides a meaningful
204 : // name to the register.
205 : inline Register backtrack_stackpointer() { return rcx; }
206 :
207 : // The registers containing a self pointer to this code's Code object.
208 : inline Register code_object_pointer() { return r8; }
209 :
210 : // Byte size of chars in the string to match (decided by the Mode argument)
211 1508819 : inline int char_size() { return static_cast<int>(mode_); }
212 :
213 : // Equivalent to a conditional branch to the label, unless the label
214 : // is NULL, in which case it is a conditional Backtrack.
215 : void BranchOrBacktrack(Condition condition, Label* to);
216 :
217 687543 : void MarkPositionForCodeRelativeFixup() {
218 2062629 : code_relative_fixup_positions_.Add(masm_.pc_offset(), zone());
219 687543 : }
220 :
221 : void FixupCodeRelativePositions();
222 :
223 : // Call and return internally in the generated code in a way that
224 : // is GC-safe (i.e., doesn't leave absolute code addresses on the stack)
225 : inline void SafeCall(Label* to);
226 : inline void SafeCallTarget(Label* label);
227 : inline void SafeReturn();
228 :
229 : // Pushes the value of a register on the backtrack stack. Decrements the
230 : // stack pointer (rcx) by a word size and stores the register's value there.
231 : inline void Push(Register source);
232 :
233 : // Pushes a value on the backtrack stack. Decrements the stack pointer (rcx)
234 : // by a word size and stores the value there.
235 : inline void Push(Immediate value);
236 :
237 : // Pushes the Code object relative offset of a label on the backtrack stack
238 : // (i.e., a backtrack target). Decrements the stack pointer (rcx)
239 : // by a word size and stores the value there.
240 : inline void Push(Label* label);
241 :
242 : // Pops a value from the backtrack stack. Reads the word at the stack pointer
243 : // (rcx) and increments it by a word size.
244 : inline void Pop(Register target);
245 :
246 : // Drops the top value from the backtrack stack without reading it.
247 : // Increments the stack pointer (rcx) by a word size.
248 : inline void Drop();
249 :
250 : inline void ReadPositionFromRegister(Register dst, int reg);
251 :
252 1482904 : Isolate* isolate() const { return masm_.isolate(); }
253 :
254 : MacroAssembler masm_;
255 : MacroAssembler::NoRootArrayScope no_root_array_scope_;
256 :
257 : ZoneList<int> code_relative_fixup_positions_;
258 :
259 : // Which mode to generate code for (LATIN1 or UC16).
260 : Mode mode_;
261 :
262 : // One greater than maximal register index actually used.
263 : int num_registers_;
264 :
265 : // Number of registers to output at the end (the saved registers
266 : // are always 0..num_saved_registers_-1)
267 : int num_saved_registers_;
268 :
269 : // Labels used internally.
270 : Label entry_label_;
271 : Label start_label_;
272 : Label success_label_;
273 : Label backtrack_label_;
274 : Label exit_label_;
275 : Label check_preempt_label_;
276 : Label stack_overflow_label_;
277 : };
278 :
279 : #endif // V8_INTERPRETED_REGEXP
280 :
281 : } // namespace internal
282 : } // namespace v8
283 :
284 : #endif // V8_REGEXP_X64_REGEXP_MACRO_ASSEMBLER_X64_H_
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