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
226
227
228
229
230
231
232
233
|
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: set ts=8 sts=2 et sw=2 tw=80:
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/* JavaScript RegExp objects. */
#ifndef vm_RegExpObject_h
#define vm_RegExpObject_h
#include "builtin/SelfHostingDefines.h"
#include "js/RegExpFlags.h"
#include "proxy/Proxy.h"
#include "vm/JSAtomState.h"
#include "vm/JSContext.h"
#include "vm/RegExpShared.h"
#include "vm/Shape.h"
/*
* JavaScript Regular Expressions
*
* There are several engine concepts associated with a single logical regexp:
*
* RegExpObject:
* The JS-visible object whose .[[Class]] equals "RegExp".
* RegExpShared:
* The compiled representation of the regexp (lazily created, cleared
* during some forms of GC).
* RegExpZone:
* Owns all RegExpShared instances in a zone.
*/
namespace js {
class GenericPrinter;
class JSONPrinter;
extern RegExpObject* RegExpAlloc(JSContext* cx, NewObjectKind newKind,
HandleObject proto = nullptr);
extern JSObject* CloneRegExpObject(JSContext* cx, Handle<RegExpObject*> regex);
class RegExpObject : public NativeObject {
static const unsigned LAST_INDEX_SLOT = 0;
static const unsigned SOURCE_SLOT = 1;
static const unsigned FLAGS_SLOT = 2;
static_assert(RegExpObject::FLAGS_SLOT == REGEXP_FLAGS_SLOT,
"FLAGS_SLOT values should be in sync with self-hosted JS");
static RegExpObject* create(JSContext* cx, Handle<JSAtom*> source,
NewObjectKind newKind);
public:
static const unsigned SHARED_SLOT = 3;
static const unsigned RESERVED_SLOTS = 4;
// This must match RESERVED_SLOTS. See assertions in CloneRegExpObject.
static constexpr gc::AllocKind AllocKind = gc::AllocKind::OBJECT4_BACKGROUND;
static const JSClass class_;
static const JSClass protoClass_;
// The maximum number of pairs a MatchResult can have, without having to
// allocate a bigger MatchResult.
static const size_t MaxPairCount = 14;
template <typename CharT>
static RegExpObject* create(JSContext* cx, const CharT* chars, size_t length,
JS::RegExpFlags flags, NewObjectKind newKind);
// This variant assumes that the characters have already previously been
// syntax checked.
static RegExpObject* createSyntaxChecked(JSContext* cx,
Handle<JSAtom*> source,
JS::RegExpFlags flags,
NewObjectKind newKind);
static RegExpObject* create(JSContext* cx, Handle<JSAtom*> source,
JS::RegExpFlags flags, NewObjectKind newKind);
/*
* Compute the initial shape to associate with fresh RegExp objects,
* encoding their initial properties. Return the shape after
* changing |obj|'s last property to it.
*/
static SharedShape* assignInitialShape(JSContext* cx,
Handle<RegExpObject*> obj);
/* Accessors. */
static constexpr size_t lastIndexSlot() { return LAST_INDEX_SLOT; }
static constexpr size_t offsetOfLastIndex() {
return getFixedSlotOffset(lastIndexSlot());
}
static bool isInitialShape(RegExpObject* rx) {
// RegExpObject has a non-configurable lastIndex property, so there must be
// at least one property. Even though lastIndex is non-configurable, it can
// be made non-writable, so we have to check if it's still writable.
MOZ_ASSERT(!rx->empty());
PropertyInfoWithKey prop = rx->getLastProperty();
return prop.isDataProperty() && prop.slot() == LAST_INDEX_SLOT &&
prop.writable();
}
const Value& getLastIndex() const { return getReservedSlot(LAST_INDEX_SLOT); }
void setLastIndex(JSContext* cx, int32_t lastIndex) {
MOZ_ASSERT(lastIndex >= 0);
MOZ_ASSERT(lookupPure(cx->names().lastIndex)->writable(),
"can't infallibly set a non-writable lastIndex on a "
"RegExp that's been exposed to script");
setReservedSlot(LAST_INDEX_SLOT, Int32Value(lastIndex));
}
void zeroLastIndex(JSContext* cx) { setLastIndex(cx, 0); }
static JSLinearString* toString(JSContext* cx, Handle<RegExpObject*> obj);
JSAtom* getSource() const {
return &getReservedSlot(SOURCE_SLOT).toString()->asAtom();
}
void setSource(JSAtom* source) {
setReservedSlot(SOURCE_SLOT, StringValue(source));
}
/* Flags. */
static constexpr size_t flagsSlot() { return FLAGS_SLOT; }
static constexpr size_t offsetOfFlags() {
return getFixedSlotOffset(flagsSlot());
}
static constexpr size_t offsetOfShared() {
return getFixedSlotOffset(SHARED_SLOT);
}
JS::RegExpFlags getFlags() const {
return JS::RegExpFlags(getFixedSlot(FLAGS_SLOT).toInt32());
}
void setFlags(JS::RegExpFlags flags) {
setFixedSlot(FLAGS_SLOT, Int32Value(flags.value()));
}
bool hasIndices() const { return getFlags().hasIndices(); }
bool global() const { return getFlags().global(); }
bool ignoreCase() const { return getFlags().ignoreCase(); }
bool multiline() const { return getFlags().multiline(); }
bool dotAll() const { return getFlags().dotAll(); }
bool unicode() const { return getFlags().unicode(); }
bool unicodeSets() const { return getFlags().unicodeSets(); }
bool sticky() const { return getFlags().sticky(); }
bool isGlobalOrSticky() const {
JS::RegExpFlags flags = getFlags();
return flags.global() || flags.sticky();
}
static bool isOriginalFlagGetter(JSNative native, JS::RegExpFlags* mask);
static RegExpShared* getShared(JSContext* cx, Handle<RegExpObject*> regexp);
bool hasShared() const { return !getFixedSlot(SHARED_SLOT).isUndefined(); }
RegExpShared* getShared() const {
return static_cast<RegExpShared*>(getFixedSlot(SHARED_SLOT).toGCThing());
}
void setShared(RegExpShared* shared) {
MOZ_ASSERT(shared);
setFixedSlot(SHARED_SLOT, PrivateGCThingValue(shared));
}
void clearShared() { setFixedSlot(SHARED_SLOT, UndefinedValue()); }
void initIgnoringLastIndex(JSAtom* source, JS::RegExpFlags flags);
// NOTE: This method is *only* safe to call on RegExps that haven't been
// exposed to script, because it requires that the "lastIndex"
// property be writable.
void initAndZeroLastIndex(JSAtom* source, JS::RegExpFlags flags,
JSContext* cx);
#if defined(DEBUG) || defined(JS_JITSPEW)
void dumpOwnFields(js::JSONPrinter& json) const;
void dumpOwnStringContent(js::GenericPrinter& out) const;
#endif
private:
/*
* Precondition: the syntax for |source| has already been validated.
* Side effect: sets the private field.
*/
static RegExpShared* createShared(JSContext* cx,
Handle<RegExpObject*> regexp);
/* Call setShared in preference to setPrivate. */
void setPrivate(void* priv) = delete;
};
/*
* Parse regexp flags. Report an error and return false if an invalid
* sequence of flags is encountered (repeat/invalid flag).
*
* N.B. flagStr must be rooted.
*/
bool ParseRegExpFlags(JSContext* cx, JSString* flagStr,
JS::RegExpFlags* flagsOut);
// Assuming GetBuiltinClass(obj) is ESClass::RegExp, return a RegExpShared for
// obj.
inline RegExpShared* RegExpToShared(JSContext* cx, HandleObject obj) {
if (obj->is<RegExpObject>()) {
return RegExpObject::getShared(cx, obj.as<RegExpObject>());
}
return Proxy::regexp_toShared(cx, obj);
}
/* Escape all slashes and newlines in the given string. */
extern JSLinearString* EscapeRegExpPattern(JSContext* cx, Handle<JSAtom*> src);
template <typename CharT>
extern bool HasRegExpMetaChars(const CharT* chars, size_t length);
extern bool StringHasRegExpMetaChars(JSLinearString* str);
} /* namespace js */
#endif /* vm_RegExpObject_h */
|
