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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_REGEXP_MACRO_ASSEMBLER_IRREGEXP_H_
6 : #define V8_REGEXP_REGEXP_MACRO_ASSEMBLER_IRREGEXP_H_
7 :
8 : #include "src/regexp/regexp-macro-assembler.h"
9 :
10 : namespace v8 {
11 : namespace internal {
12 :
13 : // A light-weight assembler for the Irregexp byte code.
14 : class RegExpMacroAssemblerIrregexp: public RegExpMacroAssembler {
15 : public:
16 : // Create an assembler. Instructions and relocation information are emitted
17 : // into a buffer, with the instructions starting from the beginning and the
18 : // relocation information starting from the end of the buffer. See CodeDesc
19 : // for a detailed comment on the layout (globals.h).
20 : //
21 : // The assembler allocates and grows its own buffer, and buffer_size
22 : // determines the initial buffer size. The buffer is owned by the assembler
23 : // and deallocated upon destruction of the assembler.
24 : RegExpMacroAssemblerIrregexp(Isolate* isolate, Zone* zone);
25 : virtual ~RegExpMacroAssemblerIrregexp();
26 : // The byte-code interpreter checks on each push anyway.
27 68406 : virtual int stack_limit_slack() { return 1; }
28 28327 : virtual bool CanReadUnaligned() { return false; }
29 : virtual void Bind(Label* label);
30 : virtual void AdvanceCurrentPosition(int by); // Signed cp change.
31 : virtual void PopCurrentPosition();
32 : virtual void PushCurrentPosition();
33 : virtual void Backtrack();
34 : virtual void GoTo(Label* label);
35 : virtual void PushBacktrack(Label* label);
36 : virtual bool Succeed();
37 : virtual void Fail();
38 : virtual void PopRegister(int register_index);
39 : virtual void PushRegister(int register_index,
40 : StackCheckFlag check_stack_limit);
41 : virtual void AdvanceRegister(int reg, int by); // r[reg] += by.
42 : virtual void SetCurrentPositionFromEnd(int by);
43 : virtual void SetRegister(int register_index, int to);
44 : virtual void WriteCurrentPositionToRegister(int reg, int cp_offset);
45 : virtual void ClearRegisters(int reg_from, int reg_to);
46 : virtual void ReadCurrentPositionFromRegister(int reg);
47 : virtual void WriteStackPointerToRegister(int reg);
48 : virtual void ReadStackPointerFromRegister(int reg);
49 : virtual void LoadCurrentCharacter(int cp_offset,
50 : Label* on_end_of_input,
51 : bool check_bounds = true,
52 : int characters = 1);
53 : virtual void CheckCharacter(unsigned c, Label* on_equal);
54 : virtual void CheckCharacterAfterAnd(unsigned c,
55 : unsigned mask,
56 : Label* on_equal);
57 : virtual void CheckCharacterGT(uc16 limit, Label* on_greater);
58 : virtual void CheckCharacterLT(uc16 limit, Label* on_less);
59 : virtual void CheckGreedyLoop(Label* on_tos_equals_current_position);
60 : virtual void CheckAtStart(Label* on_at_start);
61 : virtual void CheckNotAtStart(int cp_offset, Label* on_not_at_start);
62 : virtual void CheckNotCharacter(unsigned c, Label* on_not_equal);
63 : virtual void CheckNotCharacterAfterAnd(unsigned c,
64 : unsigned mask,
65 : Label* on_not_equal);
66 : virtual void CheckNotCharacterAfterMinusAnd(uc16 c,
67 : uc16 minus,
68 : uc16 mask,
69 : Label* on_not_equal);
70 : virtual void CheckCharacterInRange(uc16 from,
71 : uc16 to,
72 : Label* on_in_range);
73 : virtual void CheckCharacterNotInRange(uc16 from,
74 : uc16 to,
75 : Label* on_not_in_range);
76 : virtual void CheckBitInTable(Handle<ByteArray> table, Label* on_bit_set);
77 : virtual void CheckNotBackReference(int start_reg, bool read_backward,
78 : Label* on_no_match);
79 : virtual void CheckNotBackReferenceIgnoreCase(int start_reg,
80 : bool read_backward, bool unicode,
81 : Label* on_no_match);
82 : virtual void IfRegisterLT(int register_index, int comparand, Label* if_lt);
83 : virtual void IfRegisterGE(int register_index, int comparand, Label* if_ge);
84 : virtual void IfRegisterEqPos(int register_index, Label* if_eq);
85 :
86 : virtual IrregexpImplementation Implementation();
87 : virtual Handle<HeapObject> GetCode(Handle<String> source);
88 :
89 : private:
90 : void Expand();
91 : // Code and bitmap emission.
92 : inline void EmitOrLink(Label* label);
93 : inline void Emit32(uint32_t x);
94 : inline void Emit16(uint32_t x);
95 : inline void Emit8(uint32_t x);
96 : inline void Emit(uint32_t bc, uint32_t arg);
97 : // Bytecode buffer.
98 : int length();
99 : void Copy(byte* a);
100 :
101 : // The buffer into which code and relocation info are generated.
102 : Vector<byte> buffer_;
103 : // The program counter.
104 : int pc_;
105 : // True if the assembler owns the buffer, false if buffer is external.
106 : bool own_buffer_;
107 : Label backtrack_;
108 :
109 : int advance_current_start_;
110 : int advance_current_offset_;
111 : int advance_current_end_;
112 :
113 : Isolate* isolate_;
114 :
115 : static const int kInvalidPC = -1;
116 :
117 : DISALLOW_IMPLICIT_CONSTRUCTORS(RegExpMacroAssemblerIrregexp);
118 : };
119 :
120 : } // namespace internal
121 : } // namespace v8
122 :
123 : #endif // V8_REGEXP_REGEXP_MACRO_ASSEMBLER_IRREGEXP_H_
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