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
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
|
/* -*- 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/. */
#ifndef mozilla_dom_DOMJSClass_h
#define mozilla_dom_DOMJSClass_h
#include "jsapi.h"
#include "jsfriendapi.h"
#include "js/Object.h" // JS::GetClass, JS::GetReservedSlot
#include "js/Wrapper.h"
#include "mozilla/Assertions.h"
#include "mozilla/Attributes.h"
#include "mozilla/OriginTrials.h"
#include "mozilla/Likely.h"
#include "mozilla/dom/PrototypeList.h" // auto-generated
#include "mozilla/dom/WebIDLPrefs.h" // auto-generated
class nsCycleCollectionParticipant;
class nsWrapperCache;
struct JSFunctionSpec;
struct JSPropertySpec;
struct JSStructuredCloneReader;
struct JSStructuredCloneWriter;
class nsIGlobalObject;
// All DOM globals must have a slot at DOM_PROTOTYPE_SLOT.
#define DOM_PROTOTYPE_SLOT JSCLASS_GLOBAL_SLOT_COUNT
// Keep this count up to date with any extra global slots added above.
#define DOM_GLOBAL_SLOTS 1
// We use these flag bits for the new bindings.
#define JSCLASS_DOM_GLOBAL JSCLASS_USERBIT1
#define JSCLASS_IS_DOMIFACEANDPROTOJSCLASS JSCLASS_USERBIT2
namespace mozilla::dom {
/**
* Returns true if code running in the given JSContext is allowed to access
* [SecureContext] API on the given JSObject.
*
* [SecureContext] API exposure is restricted to use by code in a Secure
* Contexts:
*
* https://w3c.github.io/webappsec-secure-contexts/
*
* Since we want [SecureContext] exposure to depend on the privileges of the
* running code (rather than the privileges of an object's creator), this
* function checks to see whether the given JSContext's Realm is flagged
* as a Secure Context. That allows us to make sure that system principal code
* (which is marked as a Secure Context) can access Secure Context API on an
* object in a different realm, regardless of whether the other realm is a
* Secure Context or not.
*
* Checking the JSContext's Realm doesn't work for expanded principal
* globals accessing a Secure Context web page though (e.g. those used by frame
* scripts). To handle that we fall back to checking whether the JSObject came
* from a Secure Context.
*
* Note: We'd prefer this function to live in BindingUtils.h, but we need to
* call it in this header, and BindingUtils.h includes us (i.e. we'd have a
* circular dependency between headers if it lived there).
*/
inline bool IsSecureContextOrObjectIsFromSecureContext(JSContext* aCx,
JSObject* aObj) {
MOZ_ASSERT(!js::IsWrapper(aObj));
return JS::GetIsSecureContext(js::GetContextRealm(aCx)) ||
JS::GetIsSecureContext(js::GetNonCCWObjectRealm(aObj));
}
typedef bool (*ResolveOwnProperty)(
JSContext* cx, JS::Handle<JSObject*> wrapper, JS::Handle<JSObject*> obj,
JS::Handle<jsid> id,
JS::MutableHandle<mozilla::Maybe<JS::PropertyDescriptor>> desc);
typedef bool (*EnumerateOwnProperties)(JSContext* cx,
JS::Handle<JSObject*> wrapper,
JS::Handle<JSObject*> obj,
JS::MutableHandleVector<jsid> props);
typedef bool (*DeleteNamedProperty)(JSContext* cx,
JS::Handle<JSObject*> wrapper,
JS::Handle<JSObject*> obj,
JS::Handle<jsid> id,
JS::ObjectOpResult& opresult);
// Returns true if the given global is of a type whose bit is set in
// aNonExposedGlobals.
bool IsNonExposedGlobal(JSContext* aCx, JSObject* aGlobal,
uint32_t aNonExposedGlobals);
struct ConstantSpec {
const char* name;
JS::Value value;
};
typedef bool (*PropertyEnabled)(JSContext* cx, JSObject* global);
namespace GlobalNames {
// The names of our possible globals. These are the names of the actual
// interfaces, not of the global names used to refer to them in IDL [Exposed]
// annotations.
static const uint32_t Window = 1u << 0;
static const uint32_t DedicatedWorkerGlobalScope = 1u << 1;
static const uint32_t SharedWorkerGlobalScope = 1u << 2;
static const uint32_t ServiceWorkerGlobalScope = 1u << 3;
static const uint32_t WorkerDebuggerGlobalScope = 1u << 4;
static const uint32_t WorkletGlobalScope = 1u << 5;
static const uint32_t AudioWorkletGlobalScope = 1u << 6;
static const uint32_t PaintWorkletGlobalScope = 1u << 7;
static const uint32_t ShadowRealmGlobalScope = 1u << 8;
static constexpr uint32_t kCount = 9;
} // namespace GlobalNames
struct PrefableDisablers {
inline bool isEnabled(JSContext* cx, JS::Handle<JSObject*> obj) const {
if (nonExposedGlobals &&
IsNonExposedGlobal(cx, JS::GetNonCCWObjectGlobal(obj),
nonExposedGlobals)) {
return false;
}
if (prefIndex != WebIDLPrefIndex::NoPref &&
!sWebIDLPrefs[uint16_t(prefIndex)]()) {
return false;
}
if (secureContext && !IsSecureContextOrObjectIsFromSecureContext(cx, obj)) {
return false;
}
if (trial != OriginTrial(0) &&
!OriginTrials::IsEnabled(cx, JS::GetNonCCWObjectGlobal(obj), trial)) {
// TODO(emilio): Perhaps reconsider the interaction between [Trial=""] and
// [Pref=""].
//
// In particular, it might be desirable to only check the trial if there
// is no pref or the pref is disabled.
return false;
}
if (enabledFunc && !enabledFunc(cx, JS::GetNonCCWObjectGlobal(obj))) {
return false;
}
return true;
}
// Index into the array of StaticPrefs
const WebIDLPrefIndex prefIndex;
// Bitmask of global names that we should not be exposed in.
const uint16_t nonExposedGlobals : GlobalNames::kCount;
// A boolean indicating whether a Secure Context is required.
const uint16_t secureContext : 1;
// An origin trial controlling the feature. This can be made a bitfield too if
// needed.
const OriginTrial trial;
// A function pointer to a function that can say the property is disabled
// even if "enabled" is set to true. If the pointer is null the value of
// "enabled" is used as-is.
const PropertyEnabled enabledFunc;
};
template <typename T>
struct Prefable {
inline bool isEnabled(JSContext* cx, JS::Handle<JSObject*> obj) const {
MOZ_ASSERT(!js::IsWrapper(obj));
if (MOZ_LIKELY(!disablers)) {
return true;
}
return disablers->isEnabled(cx, obj);
}
// Things that can disable this set of specs. |nullptr| means "cannot be
// disabled".
const PrefableDisablers* const disablers;
// Array of specs, terminated in whatever way is customary for T.
// Null to indicate a end-of-array for Prefable, when such an
// indicator is needed.
const T* const specs;
};
enum PropertyType {
eStaticMethod,
eStaticAttribute,
eMethod,
eAttribute,
eUnforgeableMethod,
eUnforgeableAttribute,
eConstant,
ePropertyTypeCount
};
#define NUM_BITS_PROPERTY_INFO_TYPE 3
#define NUM_BITS_PROPERTY_INFO_PREF_INDEX 13
#define NUM_BITS_PROPERTY_INFO_SPEC_INDEX 16
struct PropertyInfo {
private:
// MSVC generates static initializers if we store a jsid here, even if
// PropertyInfo has a constexpr constructor. See bug 1460341 and bug 1464036.
uintptr_t mIdBits;
public:
// One of PropertyType, will be used for accessing the corresponding Duo in
// NativePropertiesN.duos[].
uint32_t type : NUM_BITS_PROPERTY_INFO_TYPE;
// The index to the corresponding Preable in Duo.mPrefables[].
uint32_t prefIndex : NUM_BITS_PROPERTY_INFO_PREF_INDEX;
// The index to the corresponding spec in Duo.mPrefables[prefIndex].specs[].
uint32_t specIndex : NUM_BITS_PROPERTY_INFO_SPEC_INDEX;
void SetId(jsid aId) {
static_assert(sizeof(jsid) == sizeof(mIdBits),
"jsid should fit in mIdBits");
mIdBits = aId.asRawBits();
}
MOZ_ALWAYS_INLINE jsid Id() const { return jsid::fromRawBits(mIdBits); }
};
static_assert(
ePropertyTypeCount <= 1ull << NUM_BITS_PROPERTY_INFO_TYPE,
"We have property type count that is > (1 << NUM_BITS_PROPERTY_INFO_TYPE)");
// Conceptually, NativeProperties has seven (Prefable<T>*, PropertyInfo*) duos
// (where T is one of JSFunctionSpec, JSPropertySpec, or ConstantSpec), one for
// each of: static methods and attributes, methods and attributes, unforgeable
// methods and attributes, and constants.
//
// That's 14 pointers, but in most instances most of the duos are all null, and
// there are many instances. To save space we use a variable-length type,
// NativePropertiesN<N>, to hold the data and getters to access it. It has N
// actual duos (stored in duos[]), plus four bits for each of the 7 possible
// duos: 1 bit that states if that duo is present, and 3 that state that duo's
// offset (if present) in duos[].
//
// All duo accesses should be done via the getters, which contain assertions
// that check we don't overrun the end of the struct. (The duo data members are
// public only so they can be statically initialized.) These assertions should
// never fail so long as (a) accesses to the variable-length part are guarded by
// appropriate Has*() calls, and (b) all instances are well-formed, i.e. the
// value of N matches the number of mHas* members that are true.
//
// We store all the property ids a NativePropertiesN owns in a single array of
// PropertyInfo structs. Each struct contains an id and the information needed
// to find the corresponding Prefable for the enabled check, as well as the
// information needed to find the correct property descriptor in the
// Prefable. We also store an array of indices into the PropertyInfo array,
// sorted by bits of the corresponding jsid. Given a jsid, this allows us to
// binary search for the index of the corresponding PropertyInfo, if any.
//
// Finally, we define a typedef of NativePropertiesN<7>, NativeProperties, which
// we use as a "base" type used to refer to all instances of NativePropertiesN.
// (7 is used because that's the maximum valid parameter, though any other
// value 1..6 could also be used.) This is reasonable because of the
// aforementioned assertions in the getters. Upcast() is used to convert
// specific instances to this "base" type.
//
// An example
// ----------
// NativeProperties points to various things, and it can be hard to keep track.
// The following example shows the layout.
//
// Imagine an example interface, with:
// - 10 properties
// - 6 methods, 3 with no disablers struct, 2 sharing the same disablers
// struct, 1 using a different disablers struct
// - 4 attributes, all with no disablers
// - The property order is such that those using the same disablers structs are
// together. (This is not guaranteed, but it makes the example simpler.)
//
// Each PropertyInfo also contain indices into sMethods/sMethods_specs (for
// method infos) and sAttributes/sAttributes_specs (for attributes), which let
// them find their spec, but these are not shown.
//
// sNativeProperties sNativeProperties_ sNativeProperties_
// ---- sortedPropertyIndices[10] propertyInfos[10]
// - <several scalar fields> ---- ----
// - sortedPropertyIndices ----> <10 indices> +--> 0 info (method)
// - duos[2] ---- | 1 info (method)
// ----(methods) | 2 info (method)
// 0 - mPrefables -------> points to sMethods below | 3 info (method)
// - mPropertyInfos ------------------------------+ 4 info (method)
// 1 - mPrefables -------> points to sAttributes below 5 info (method)
// - mPropertyInfos ---------------------------------> 6 info (attr)
// ---- 7 info (attr)
// ---- 8 info (attr)
// 9 info (attr)
// ----
//
// sMethods has three entries (excluding the terminator) because there are
// three disablers structs. The {nullptr,nullptr} serves as the terminator.
// There are also END terminators within sMethod_specs; the need for these
// terminators (as opposed to a length) is deeply embedded in SpiderMonkey.
// Disablers structs are suffixed with the index of the first spec they cover.
//
// sMethods sMethods_specs
// ---- ----
// 0 - nullptr +----> 0 spec
// - specs ----------------------+ 1 spec
// 1 - disablers ---> disablers4 2 spec
// - specs ------------------------+ 3 END
// 2 - disablers ---> disablers7 +--> 4 spec
// - specs ----------------------+ 5 spec
// 3 - nullptr | 6 END
// - nullptr +----> 7 spec
// ---- 8 END
//
// sAttributes has a single entry (excluding the terminator) because all of the
// specs lack disablers.
//
// sAttributes sAttributes_specs
// ---- ----
// 0 - nullptr +----> 0 spec
// - specs ----------------------+ 1 spec
// 1 - nullptr 2 spec
// - nullptr 3 spec
// ---- 4 END
// ----
template <int N>
struct NativePropertiesN {
// Duo structs are stored in the duos[] array, and each element in the array
// could require a different T. Therefore, we can't use the correct type for
// mPrefables. Instead we use void* and cast to the correct type in the
// getters.
struct Duo {
const /*Prefable<const T>*/ void* const mPrefables;
PropertyInfo* const mPropertyInfos;
};
constexpr const NativePropertiesN<7>* Upcast() const {
return reinterpret_cast<const NativePropertiesN<7>*>(this);
}
const PropertyInfo* PropertyInfos() const { return duos[0].mPropertyInfos; }
#define DO(SpecT, FieldName) \
public: \
/* The bitfields indicating the duo's presence and (if present) offset. */ \
const uint32_t mHas##FieldName##s : 1; \
const uint32_t m##FieldName##sOffset : 3; \
\
private: \
const Duo* FieldName##sDuo() const { \
MOZ_ASSERT(Has##FieldName##s()); \
return &duos[m##FieldName##sOffset]; \
} \
\
public: \
bool Has##FieldName##s() const { return mHas##FieldName##s; } \
const Prefable<const SpecT>* FieldName##s() const { \
return static_cast<const Prefable<const SpecT>*>( \
FieldName##sDuo()->mPrefables); \
} \
PropertyInfo* FieldName##PropertyInfos() const { \
return FieldName##sDuo()->mPropertyInfos; \
}
DO(JSFunctionSpec, StaticMethod)
DO(JSPropertySpec, StaticAttribute)
DO(JSFunctionSpec, Method)
DO(JSPropertySpec, Attribute)
DO(JSFunctionSpec, UnforgeableMethod)
DO(JSPropertySpec, UnforgeableAttribute)
DO(ConstantSpec, Constant)
#undef DO
// The index to the iterator method in MethodPropertyInfos() array.
const int16_t iteratorAliasMethodIndex;
// The number of PropertyInfo structs that the duos manage. This is the total
// count across all duos.
const uint16_t propertyInfoCount;
// The sorted indices array from sorting property ids, which will be used when
// we binary search for a property.
uint16_t* sortedPropertyIndices;
const Duo duos[N];
};
// Ensure the struct has the expected size. The 8 is for the bitfields plus
// iteratorAliasMethodIndex and idsLength; the rest is for the idsSortedIndex,
// and duos[].
static_assert(sizeof(NativePropertiesN<1>) == 8 + 3 * sizeof(void*), "1 size");
static_assert(sizeof(NativePropertiesN<2>) == 8 + 5 * sizeof(void*), "2 size");
static_assert(sizeof(NativePropertiesN<3>) == 8 + 7 * sizeof(void*), "3 size");
static_assert(sizeof(NativePropertiesN<4>) == 8 + 9 * sizeof(void*), "4 size");
static_assert(sizeof(NativePropertiesN<5>) == 8 + 11 * sizeof(void*), "5 size");
static_assert(sizeof(NativePropertiesN<6>) == 8 + 13 * sizeof(void*), "6 size");
static_assert(sizeof(NativePropertiesN<7>) == 8 + 15 * sizeof(void*), "7 size");
// The "base" type.
typedef NativePropertiesN<7> NativeProperties;
struct NativePropertiesHolder {
const NativeProperties* regular;
const NativeProperties* chromeOnly;
// Points to a static bool that's set to true once the regular and chromeOnly
// NativeProperties have been inited. This is a pointer to a bool instead of
// a bool value because NativePropertiesHolder is stored by value in
// a static const NativePropertyHooks.
bool* inited;
};
// Helper structure for Xrays for DOM binding objects. The same instance is used
// for instances, interface objects and interface prototype objects of a
// specific interface.
struct NativePropertyHooks {
// The hook to call for resolving indexed or named properties. May be null if
// there can't be any.
ResolveOwnProperty mResolveOwnProperty;
// The hook to call for enumerating indexed or named properties. May be null
// if there can't be any.
EnumerateOwnProperties mEnumerateOwnProperties;
// The hook to call to delete a named property. May be null if there are no
// named properties or no named property deleter. On success (true return)
// the "found" argument will be set to true if there was in fact such a named
// property and false otherwise. If it's set to false, the caller is expected
// to proceed with whatever deletion behavior it would have if there were no
// named properties involved at all (i.e. if the hook were null). If it's set
// to true, it will indicate via opresult whether the delete actually
// succeeded.
DeleteNamedProperty mDeleteNamedProperty;
// The property arrays for this interface.
NativePropertiesHolder mNativeProperties;
// This will be set to the ID of the interface prototype object for the
// interface, if it has one. If it doesn't have one it will be set to
// prototypes::id::_ID_Count.
prototypes::ID mPrototypeID;
// This will be set to the ID of the interface object for the interface, if it
// has one. If it doesn't have one it will be set to
// constructors::id::_ID_Count.
constructors::ID mConstructorID;
// The JSClass to use for expandos on our Xrays. Can be null, in which case
// Xrays will use a default class of their choice.
const JSClass* mXrayExpandoClass;
};
enum DOMObjectType : uint8_t {
eInstance,
eGlobalInstance,
eInterface,
eInterfacePrototype,
eGlobalInterfacePrototype,
eNamespace,
eNamedPropertiesObject
};
inline bool IsInstance(DOMObjectType type) {
return type == eInstance || type == eGlobalInstance;
}
inline bool IsInterfacePrototype(DOMObjectType type) {
return type == eInterfacePrototype || type == eGlobalInterfacePrototype;
}
typedef JSObject* (*AssociatedGlobalGetter)(JSContext* aCx,
JS::Handle<JSObject*> aObj);
typedef JSObject* (*ProtoGetter)(JSContext* aCx);
/**
* Returns a handle to the relevant WebIDL prototype object for the current
* compartment global (which may be a handle to null on out of memory). Once
* allocated, the prototype object is guaranteed to exist as long as the global
* does, since the global traces its array of WebIDL prototypes and
* constructors.
*/
typedef JS::Handle<JSObject*> (*ProtoHandleGetter)(JSContext* aCx);
/**
* Serializes a WebIDL object for structured cloning. aObj may not be in the
* compartment of aCx in cases when we were working with a cross-compartment
* wrapper. aObj is expected to be an object of the DOMJSClass that we got the
* serializer from.
*/
typedef bool (*WebIDLSerializer)(JSContext* aCx,
JSStructuredCloneWriter* aWriter,
JS::Handle<JSObject*> aObj);
/**
* Deserializes a WebIDL object from a structured clone serialization.
*/
typedef JSObject* (*WebIDLDeserializer)(JSContext* aCx,
nsIGlobalObject* aGlobal,
JSStructuredCloneReader* aReader);
typedef nsWrapperCache* (*WrapperCacheGetter)(JS::Handle<JSObject*> aObj);
// Special JSClass for reflected DOM objects.
struct DOMJSClass {
// It would be nice to just inherit from JSClass, but that precludes pure
// compile-time initialization of the form |DOMJSClass = {...};|, since C++
// only allows brace initialization for aggregate/POD types.
const JSClass mBase;
// A list of interfaces that this object implements, in order of decreasing
// derivedness.
const prototypes::ID mInterfaceChain[MAX_PROTOTYPE_CHAIN_LENGTH];
// We store the DOM object in reserved slot with index DOM_OBJECT_SLOT or in
// the proxy private if we use a proxy object.
// Sometimes it's an nsISupports and sometimes it's not; this class tells
// us which it is.
const bool mDOMObjectIsISupports;
const NativePropertyHooks* mNativeHooks;
// A callback to find the associated global for our C++ object. Note that
// this is used in cases when that global is _changing_, so it will not match
// the global of the JSObject* passed in to this function!
AssociatedGlobalGetter mGetAssociatedGlobal;
ProtoHandleGetter mGetProto;
// This stores the CC participant for the native, null if this class does not
// implement cycle collection or if it inherits from nsISupports (we can get
// the CC participant by QI'ing in that case).
nsCycleCollectionParticipant* mParticipant;
// The serializer for this class if the relevant object is [Serializable].
// Null otherwise.
WebIDLSerializer mSerializer;
// A callback to get the wrapper cache for C++ objects that don't inherit from
// nsISupports, or null.
WrapperCacheGetter mWrapperCacheGetter;
static const DOMJSClass* FromJSClass(const JSClass* base) {
MOZ_ASSERT(base->flags & JSCLASS_IS_DOMJSCLASS);
return reinterpret_cast<const DOMJSClass*>(base);
}
const JSClass* ToJSClass() const { return &mBase; }
};
// Special JSClass for DOM interface and interface prototype objects.
struct DOMIfaceAndProtoJSClass {
// It would be nice to just inherit from JSClass, but that precludes pure
// compile-time initialization of the form
// |DOMJSInterfaceAndPrototypeClass = {...};|, since C++ only allows brace
// initialization for aggregate/POD types.
const JSClass mBase;
// Either eInterface, eNamespace, eInterfacePrototype,
// eGlobalInterfacePrototype or eNamedPropertiesObject.
DOMObjectType mType; // uint8_t
// Boolean indicating whether this object wants a @@hasInstance property
// pointing to InterfaceHasInstance defined on it. Only ever true for the
// eInterface case.
bool wantsInterfaceHasInstance;
const prototypes::ID mPrototypeID; // uint16_t
const uint32_t mDepth;
const NativePropertyHooks* mNativeHooks;
// The value to return for Function.prototype.toString on this interface
// object.
const char* mFunToString;
ProtoGetter mGetParentProto;
static const DOMIfaceAndProtoJSClass* FromJSClass(const JSClass* base) {
MOZ_ASSERT(base->flags & JSCLASS_IS_DOMIFACEANDPROTOJSCLASS);
return reinterpret_cast<const DOMIfaceAndProtoJSClass*>(base);
}
const JSClass* ToJSClass() const { return &mBase; }
};
class ProtoAndIfaceCache;
inline bool DOMGlobalHasProtoAndIFaceCache(JSObject* global) {
MOZ_DIAGNOSTIC_ASSERT(JS::GetClass(global)->flags & JSCLASS_DOM_GLOBAL);
// This can be undefined if we GC while creating the global
return !JS::GetReservedSlot(global, DOM_PROTOTYPE_SLOT).isUndefined();
}
inline bool HasProtoAndIfaceCache(JSObject* global) {
if (!(JS::GetClass(global)->flags & JSCLASS_DOM_GLOBAL)) {
return false;
}
return DOMGlobalHasProtoAndIFaceCache(global);
}
inline ProtoAndIfaceCache* GetProtoAndIfaceCache(JSObject* global) {
MOZ_DIAGNOSTIC_ASSERT(JS::GetClass(global)->flags & JSCLASS_DOM_GLOBAL);
return static_cast<ProtoAndIfaceCache*>(
JS::GetReservedSlot(global, DOM_PROTOTYPE_SLOT).toPrivate());
}
} // namespace mozilla::dom
#endif /* mozilla_dom_DOMJSClass_h */
|