1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
|
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
// Copyright 2012 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#ifndef V8_NATIVE_REGEXP_MACRO_ASSEMBLER_H_
#define V8_NATIVE_REGEXP_MACRO_ASSEMBLER_H_
#include "irregexp/RegExpMacroAssembler.h"
namespace js {
namespace irregexp {
struct InputOutputData
{
const void* inputStart;
const void* inputEnd;
// Index into inputStart (in chars) at which to begin matching.
size_t startIndex;
size_t* endIndex;
MatchPairs* matches;
// RegExpMacroAssembler::Result for non-global regexps, number of captures
// for global regexps.
int32_t result;
template <typename CharT>
InputOutputData(const CharT* inputStart, const CharT* inputEnd,
size_t startIndex, MatchPairs* matches, size_t* endIndex)
: inputStart(inputStart),
inputEnd(inputEnd),
startIndex(startIndex),
endIndex(endIndex),
matches(matches),
result(0)
{}
};
struct FrameData
{
// Copy of the input/output data's data.
char16_t* inputStart;
size_t startIndex;
size_t* endIndex;
// Pointer to the character before the input start.
char16_t* inputStartMinusOne;
// Copy of the input MatchPairs registers, may be modified by JIT code.
int32_t* outputRegisters;
int32_t numOutputRegisters;
int32_t successfulCaptures;
void* backtrackStackBase;
};
class MOZ_STACK_CLASS NativeRegExpMacroAssembler final : public RegExpMacroAssembler
{
public:
// Type of input string to generate code for.
enum Mode { ASCII = 1, CHAR16 = 2 };
NativeRegExpMacroAssembler(LifoAlloc* alloc, RegExpShared* shared,
JSRuntime* rt, Mode mode, int registers_to_save);
// Inherited virtual methods.
RegExpCode GenerateCode(JSContext* cx, bool match_only);
int stack_limit_slack();
bool CanReadUnaligned();
void AdvanceCurrentPosition(int by);
void AdvanceRegister(int reg, int by);
void Backtrack();
void Bind(jit::Label* label);
void CheckAtStart(jit::Label* on_at_start);
void CheckCharacter(unsigned c, jit::Label* on_equal);
void CheckCharacterAfterAnd(unsigned c, unsigned and_with, jit::Label* on_equal);
void CheckCharacterGT(char16_t limit, jit::Label* on_greater);
void CheckCharacterLT(char16_t limit, jit::Label* on_less);
void CheckGreedyLoop(jit::Label* on_tos_equals_current_position);
void CheckNotAtStart(jit::Label* on_not_at_start);
void CheckNotBackReference(int start_reg, jit::Label* on_no_match);
void CheckNotBackReferenceIgnoreCase(int start_reg, jit::Label* on_no_match, bool unicode);
void CheckNotCharacter(unsigned c, jit::Label* on_not_equal);
void CheckNotCharacterAfterAnd(unsigned c, unsigned and_with, jit::Label* on_not_equal);
void CheckNotCharacterAfterMinusAnd(char16_t c, char16_t minus, char16_t and_with,
jit::Label* on_not_equal);
void CheckCharacterInRange(char16_t from, char16_t to,
jit::Label* on_in_range);
void CheckCharacterNotInRange(char16_t from, char16_t to,
jit::Label* on_not_in_range);
void CheckBitInTable(uint8_t* table, jit::Label* on_bit_set);
void CheckPosition(int cp_offset, jit::Label* on_outside_input);
void JumpOrBacktrack(jit::Label* to);
bool CheckSpecialCharacterClass(char16_t type, jit::Label* on_no_match);
void Fail();
void IfRegisterGE(int reg, int comparand, jit::Label* if_ge);
void IfRegisterLT(int reg, int comparand, jit::Label* if_lt);
void IfRegisterEqPos(int reg, jit::Label* if_eq);
void LoadCurrentCharacter(int cp_offset, jit::Label* on_end_of_input,
bool check_bounds = true, int characters = 1);
void PopCurrentPosition();
void PopRegister(int register_index);
void PushCurrentPosition();
void PushRegister(int register_index, StackCheckFlag check_stack_limit);
void ReadCurrentPositionFromRegister(int reg);
void ReadBacktrackStackPointerFromRegister(int reg);
void SetCurrentPositionFromEnd(int by);
void SetRegister(int register_index, int to);
bool Succeed();
void WriteCurrentPositionToRegister(int reg, int cp_offset);
void ClearRegisters(int reg_from, int reg_to);
void WriteBacktrackStackPointerToRegister(int reg);
void PushBacktrack(jit::Label* label);
void BindBacktrack(jit::Label* label);
// Compares two-byte strings case insensitively.
// Called from generated RegExp code.
static int CaseInsensitiveCompareUC16(jit::Address byte_offset1,
jit::Address byte_offset2,
size_t byte_length);
// Byte map of one byte characters with a 0xff if the character is a word
// character (digit, letter or underscore) and 0x00 otherwise.
// Used by generated RegExp code.
static const uint8_t word_character_map[256];
// Byte size of chars in the string to match (decided by the Mode argument)
inline int char_size() { return static_cast<int>(mode_); }
inline jit::Scale factor() { return mode_ == CHAR16 ? jit::TimesTwo : jit::TimesOne; }
jit::Label* BranchOrBacktrack(jit::Label* branch);
// Pushes a register or constant on the backtrack stack. Decrements the
// stack pointer by a word size and stores the register's value there.
void PushBacktrack(jit::Register value);
void PushBacktrack(int32_t value);
// Pop a value from the backtrack stack.
void PopBacktrack(jit::Register target);
// Check whether we are exceeding the stack limit on the backtrack stack.
void CheckBacktrackStackLimit();
void LoadCurrentCharacterUnchecked(int cp_offset, int characters);
private:
jit::MacroAssembler masm;
JSRuntime* runtime;
Mode mode_;
jit::Label entry_label_;
jit::Label start_label_;
jit::Label backtrack_label_;
jit::Label success_label_;
jit::Label exit_label_;
jit::Label stack_overflow_label_;
jit::Label exit_with_exception_label_;
// Set of registers which are used by the code generator, and as such which
// are saved.
jit::LiveGeneralRegisterSet savedNonVolatileRegisters;
struct LabelPatch {
// Once it is bound via BindBacktrack, |label| becomes null and
// |labelOffset| is set.
jit::Label* label;
size_t labelOffset;
jit::CodeOffset patchOffset;
LabelPatch(jit::Label* label, jit::CodeOffset patchOffset)
: label(label), labelOffset(0), patchOffset(patchOffset)
{}
};
Vector<LabelPatch, 4, SystemAllocPolicy> labelPatches;
// See RegExpMacroAssembler.cpp for the meaning of these registers.
jit::Register input_end_pointer;
jit::Register current_character;
jit::Register current_position;
jit::Register backtrack_stack_pointer;
jit::Register temp0, temp1, temp2;
// The frame_pointer-relative location of a regexp register.
jit::Address register_location(int register_index) {
checkRegister(register_index);
return jit::Address(masm.getStackPointer(), register_offset(register_index));
}
int32_t register_offset(int register_index) {
return sizeof(FrameData) + register_index * sizeof(void*);
}
};
} } // namespace js::irregexp
#endif // V8_NATIVE_REGEXP_MACRO_ASSEMBLER_H_
|
