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