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1 // Copyright 2011 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_MIPS_REGEXP_MACRO_ASSEMBLER_MIPS_H_
6 #define V8_REGEXP_MIPS_REGEXP_MACRO_ASSEMBLER_MIPS_H_
7 
8 #include "src/codegen/macro-assembler.h"
9 #include "src/regexp/regexp-macro-assembler.h"
10 
11 namespace v8 {
12 namespace internal {
13 
14 class V8_EXPORT_PRIVATE RegExpMacroAssemblerMIPS
15     : public NativeRegExpMacroAssembler {
16  public:
17   RegExpMacroAssemblerMIPS(Isolate* isolate, Zone* zone, Mode mode,
18                            int registers_to_save);
19   ~RegExpMacroAssemblerMIPS() override;
20   int stack_limit_slack() override;
21   void AdvanceCurrentPosition(int by) override;
22   void AdvanceRegister(int reg, int by) override;
23   void Backtrack() override;
24   void Bind(Label* label) override;
25   void CheckAtStart(int cp_offset, Label* on_at_start) override;
26   void CheckCharacter(uint32_t c, Label* on_equal) override;
27   void CheckCharacterAfterAnd(uint32_t c, uint32_t mask,
28                               Label* on_equal) override;
29   void CheckCharacterGT(base::uc16 limit, Label* on_greater) override;
30   void CheckCharacterLT(base::uc16 limit, Label* on_less) override;
31   // A "greedy loop" is a loop that is both greedy and with a simple
32   // body. It has a particularly simple implementation.
33   void CheckGreedyLoop(Label* on_tos_equals_current_position) override;
34   void CheckNotAtStart(int cp_offset, Label* on_not_at_start) override;
35   void CheckNotBackReference(int start_reg, bool read_backward,
36                              Label* on_no_match) override;
37   void CheckNotBackReferenceIgnoreCase(int start_reg, bool read_backward,
38                                        bool unicode,
39                                        Label* on_no_match) override;
40   void CheckNotCharacter(uint32_t c, Label* on_not_equal) override;
41   void CheckNotCharacterAfterAnd(uint32_t c, uint32_t mask,
42                                  Label* on_not_equal) override;
43   void CheckNotCharacterAfterMinusAnd(base::uc16 c, base::uc16 minus,
44                                       base::uc16 mask,
45                                       Label* on_not_equal) override;
46   void CheckCharacterInRange(base::uc16 from, base::uc16 to,
47                              Label* on_in_range) override;
48   void CheckCharacterNotInRange(base::uc16 from, base::uc16 to,
49                                 Label* on_not_in_range) override;
50   bool CheckCharacterInRangeArray(const ZoneList<CharacterRange>* ranges,
51                                   Label* on_in_range) override;
52   bool CheckCharacterNotInRangeArray(const ZoneList<CharacterRange>* ranges,
53                                      Label* on_not_in_range) override;
54   void CheckBitInTable(Handle<ByteArray> table, Label* on_bit_set) override;
55 
56   // Checks whether the given offset from the current position is before
57   // the end of the string.
58   void CheckPosition(int cp_offset, Label* on_outside_input) override;
59   bool CheckSpecialCharacterClass(StandardCharacterSet type,
60                                   Label* on_no_match) override;
61   void Fail() override;
62   Handle<HeapObject> GetCode(Handle<String> source) override;
63   void GoTo(Label* label) override;
64   void IfRegisterGE(int reg, int comparand, Label* if_ge) override;
65   void IfRegisterLT(int reg, int comparand, Label* if_lt) override;
66   void IfRegisterEqPos(int reg, Label* if_eq) override;
67   IrregexpImplementation Implementation() override;
68   void LoadCurrentCharacterUnchecked(int cp_offset,
69                                      int character_count) override;
70   void PopCurrentPosition() override;
71   void PopRegister(int register_index) override;
72   void PushBacktrack(Label* label) override;
73   void PushCurrentPosition() override;
74   void PushRegister(int register_index,
75                     StackCheckFlag check_stack_limit) override;
76   void ReadCurrentPositionFromRegister(int reg) override;
77   void ReadStackPointerFromRegister(int reg) override;
78   void SetCurrentPositionFromEnd(int by) override;
79   void SetRegister(int register_index, int to) override;
80   bool Succeed() override;
81   void WriteCurrentPositionToRegister(int reg, int cp_offset) override;
82   void ClearRegisters(int reg_from, int reg_to) override;
83   void WriteStackPointerToRegister(int reg) override;
84   bool CanReadUnaligned() const override;
85 
86   // Called from RegExp if the stack-guard is triggered.
87   // If the code object is relocated, the return address is fixed before
88   // returning.
89   // {raw_code} is an Address because this is called via ExternalReference.
90   static int CheckStackGuardState(Address* return_address, Address raw_code,
91                                   Address re_frame);
92 
93  private:
94   // Offsets from frame_pointer() of function parameters and stored registers.
95   static const int kFramePointer = 0;
96 
97   // Above the frame pointer - Stored registers and stack passed parameters.
98   static const int kStoredRegisters = kFramePointer;
99   // Return address (stored from link register, read into pc on return).
100   static const int kReturnAddress = kStoredRegisters + 9 * kPointerSize;
101   // Stack frame header.
102   static const int kStackFrameHeader = kReturnAddress;
103   // Stack parameters placed by caller.
104   static const int kRegisterOutput = kStackFrameHeader + 20;
105   static const int kNumOutputRegisters = kRegisterOutput + kPointerSize;
106   static const int kDirectCall = kNumOutputRegisters + kPointerSize;
107   static const int kIsolate = kDirectCall + kPointerSize;
108 
109   // Below the frame pointer.
110   // Register parameters stored by setup code.
111   static const int kInputEnd = kFramePointer - kPointerSize;
112   static const int kInputStart = kInputEnd - kPointerSize;
113   static const int kStartIndex = kInputStart - kPointerSize;
114   static const int kInputString = kStartIndex - kPointerSize;
115   // When adding local variables remember to push space for them in
116   // the frame in GetCode.
117   static const int kSuccessfulCaptures = kInputString - kPointerSize;
118   static const int kStringStartMinusOne = kSuccessfulCaptures - kPointerSize;
119   static const int kBacktrackCount = kStringStartMinusOne - kSystemPointerSize;
120   // Stores the initial value of the regexp stack pointer in a
121   // position-independent representation (in case the regexp stack grows and
122   // thus moves).
123   static const int kRegExpStackBasePointer =
124       kBacktrackCount - kSystemPointerSize;
125 
126   // First register address. Following registers are below it on the stack.
127   static const int kRegisterZero = kRegExpStackBasePointer - kSystemPointerSize;
128 
129   // Initial size of code buffer.
130   static const int kRegExpCodeSize = 1024;
131 
132   void PushCallerSavedRegisters();
133   void PopCallerSavedRegisters();
134 
135   // Check whether preemption has been requested.
136   void CheckPreemption();
137 
138   // Check whether we are exceeding the stack limit on the backtrack stack.
139   void CheckStackLimit();
140 
141   // Generate a call to CheckStackGuardState.
142   void CallCheckStackGuardState(Register scratch);
143   void CallIsCharacterInRangeArray(const ZoneList<CharacterRange>* ranges);
144 
145   // The ebp-relative location of a regexp register.
146   MemOperand register_location(int register_index);
147 
148   // Register holding the current input position as negative offset from
149   // the end of the string.
current_input_offset()150   static constexpr Register current_input_offset() { return s2; }
151 
152   // The register containing the current character after LoadCurrentCharacter.
current_character()153   static constexpr Register current_character() { return s5; }
154 
155   // Register holding address of the end of the input string.
end_of_input_address()156   static constexpr Register end_of_input_address() { return s6; }
157 
158   // Register holding the frame address. Local variables, parameters and
159   // regexp registers are addressed relative to this.
frame_pointer()160   static constexpr Register frame_pointer() { return fp; }
161 
162   // The register containing the backtrack stack top. Provides a meaningful
163   // name to the register.
backtrack_stackpointer()164   static constexpr Register backtrack_stackpointer() { return s7; }
165 
166   // Register holding pointer to the current code object.
code_pointer()167   static constexpr Register code_pointer() { return s1; }
168 
169   // Byte size of chars in the string to match (decided by the Mode argument).
char_size()170   inline int char_size() const { return static_cast<int>(mode_); }
171 
172   // Equivalent to a conditional branch to the label, unless the label
173   // is nullptr, in which case it is a conditional Backtrack.
174   void BranchOrBacktrack(Label* to,
175                          Condition condition,
176                          Register rs,
177                          const Operand& rt);
178 
179   // Call and return internally in the generated code in a way that
180   // is GC-safe (i.e., doesn't leave absolute code addresses on the stack)
181   inline void SafeCall(Label* to,
182                        Condition cond,
183                        Register rs,
184                        const Operand& rt);
185   inline void SafeReturn();
186   inline void SafeCallTarget(Label* name);
187 
188   // Pushes the value of a register on the backtrack stack. Decrements the
189   // stack pointer by a word size and stores the register's value there.
190   inline void Push(Register source);
191 
192   // Pops a value from the backtrack stack. Reads the word at the stack pointer
193   // and increments it by a word size.
194   inline void Pop(Register target);
195 
196   void LoadRegExpStackPointerFromMemory(Register dst);
197   void StoreRegExpStackPointerToMemory(Register src, Register scratch);
198   void PushRegExpBasePointer(Register stack_pointer, Register scratch);
199   void PopRegExpBasePointer(Register stack_pointer_out, Register scratch);
200 
isolate()201   Isolate* isolate() const { return masm_->isolate(); }
202 
203   const std::unique_ptr<MacroAssembler> masm_;
204   const NoRootArrayScope no_root_array_scope_;
205 
206   // Which mode to generate code for (Latin1 or UC16).
207   const Mode mode_;
208 
209   // One greater than maximal register index actually used.
210   int num_registers_;
211 
212   // Number of registers to output at the end (the saved registers
213   // are always 0..num_saved_registers_-1).
214   const int num_saved_registers_;
215 
216   // Labels used internally.
217   Label entry_label_;
218   Label start_label_;
219   Label success_label_;
220   Label backtrack_label_;
221   Label exit_label_;
222   Label check_preempt_label_;
223   Label stack_overflow_label_;
224   Label internal_failure_label_;
225   Label fallback_label_;
226 };
227 
228 }  // namespace internal
229 }  // namespace v8
230 
231 #endif  // V8_REGEXP_MIPS_REGEXP_MACRO_ASSEMBLER_MIPS_H_
232