js/public/Wrapper.h

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
   2  * vim: set ts=8 sts=2 et sw=2 tw=80:
   3  * This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #ifndef js_Wrapper_h
   8 #define js_Wrapper_h
   9
  10 #include "mozilla/Attributes.h"
  11
  12 #include "js/Proxy.h"
  13
  14 namespace js {
  15 struct CompartmentFilter;
  16
  17 /*
  18  * Helper for Wrapper::New default options.
  19  *
  20  * Callers of Wrapper::New() who wish to specify a prototype for the created
  21  * Wrapper, *MUST* construct a WrapperOptions with a JSContext.
  22  */
  23 class MOZ_STACK_CLASS WrapperOptions : public ProxyOptions {
  24  public:
  25   WrapperOptions() : ProxyOptions(false), proto_() {}
  26
  27   explicit WrapperOptions(JSContext* cx) : ProxyOptions(false), proto_() {
  28     proto_.emplace(cx);
  29   }
  30
  31   inline JSObject* proto() const;
  32   WrapperOptions& setProto(JSObject* protoArg) {
  33     MOZ_ASSERT(proto_);
  34     *proto_ = protoArg;
  35     return *this;
  36   }
  37
  38  private:
  39   mozilla::Maybe<JS::RootedObject> proto_;
  40 };
  41
  42 // Base class for proxy handlers that want to forward all operations to an
  43 // object stored in the proxy's private slot.
  44 class JS_PUBLIC_API ForwardingProxyHandler : public BaseProxyHandler {
  45  public:
  46   using BaseProxyHandler::BaseProxyHandler;
  47
  48   /* Standard internal methods. */
  49   virtual bool getOwnPropertyDescriptor(
  50       JSContext* cx, JS::HandleObject proxy, JS::HandleId id,
  51       JS::MutableHandle<mozilla::Maybe<JS::PropertyDescriptor>> desc)
  52       const override;
  53   virtual bool defineProperty(JSContext* cx, JS::HandleObject proxy,
  54                               JS::HandleId id,
  55                               JS::Handle<JS::PropertyDescriptor> desc,
  56                               JS::ObjectOpResult& result) const override;
  57   virtual bool ownPropertyKeys(JSContext* cx, JS::HandleObject proxy,
  58                                JS::MutableHandleIdVector props) const override;
  59   virtual bool delete_(JSContext* cx, JS::HandleObject proxy, JS::HandleId id,
  60                        JS::ObjectOpResult& result) const override;
  61   virtual bool enumerate(JSContext* cx, JS::HandleObject proxy,
  62                          JS::MutableHandleIdVector props) const override;
  63   virtual bool getPrototype(JSContext* cx, JS::HandleObject proxy,
  64                             JS::MutableHandleObject protop) const override;
  65   virtual bool setPrototype(JSContext* cx, JS::HandleObject proxy,
  66                             JS::HandleObject proto,
  67                             JS::ObjectOpResult& result) const override;
  68   virtual bool getPrototypeIfOrdinary(
  69       JSContext* cx, JS::HandleObject proxy, bool* isOrdinary,
  70       JS::MutableHandleObject protop) const override;
  71   virtual bool setImmutablePrototype(JSContext* cx, JS::HandleObject proxy,
  72                                      bool* succeeded) const override;
  73   virtual bool preventExtensions(JSContext* cx, JS::HandleObject proxy,
  74                                  JS::ObjectOpResult& result) const override;
  75   virtual bool isExtensible(JSContext* cx, JS::HandleObject proxy,
  76                             bool* extensible) const override;
  77   virtual bool has(JSContext* cx, JS::HandleObject proxy, JS::HandleId id,
  78                    bool* bp) const override;
  79   virtual bool get(JSContext* cx, JS::HandleObject proxy,
  80                    JS::HandleValue receiver, JS::HandleId id,
  81                    JS::MutableHandleValue vp) const override;
  82   virtual bool set(JSContext* cx, JS::HandleObject proxy, JS::HandleId id,
  83                    JS::HandleValue v, JS::HandleValue receiver,
  84                    JS::ObjectOpResult& result) const override;
  85   virtual bool call(JSContext* cx, JS::HandleObject proxy,
  86                     const JS::CallArgs& args) const override;
  87   virtual bool construct(JSContext* cx, JS::HandleObject proxy,
  88                          const JS::CallArgs& args) const override;
  89
  90   /* SpiderMonkey extensions. */
  91   virtual bool hasOwn(JSContext* cx, JS::HandleObject proxy, JS::HandleId id,
  92                       bool* bp) const override;
  93   virtual bool getOwnEnumerablePropertyKeys(
  94       JSContext* cx, JS::HandleObject proxy,
  95       JS::MutableHandleIdVector props) const override;
  96   virtual bool nativeCall(JSContext* cx, JS::IsAcceptableThis test,
  97                           JS::NativeImpl impl,
  98                           const JS::CallArgs& args) const override;
  99   virtual bool getBuiltinClass(JSContext* cx, JS::HandleObject proxy,
 100                                ESClass* cls) const override;
 101   virtual bool isArray(JSContext* cx, JS::HandleObject proxy,
 102                        JS::IsArrayAnswer* answer) const override;
 103   virtual const char* className(JSContext* cx,
 104                                 JS::HandleObject proxy) const override;
 105   virtual JSString* fun_toString(JSContext* cx, JS::HandleObject proxy,
 106                                  bool isToSource) const override;
 107   virtual RegExpShared* regexp_toShared(JSContext* cx,
 108                                         JS::HandleObject proxy) const override;
 109   virtual bool boxedValue_unbox(JSContext* cx, JS::HandleObject proxy,
 110                                 JS::MutableHandleValue vp) const override;
 111   virtual bool isCallable(JSObject* obj) const override;
 112   virtual bool isConstructor(JSObject* obj) const override;
 113
 114   // Use the target object for private fields.
 115   virtual bool useProxyExpandoObjectForPrivateFields() const override {
 116     return false;
 117   }
 118 };
 119
 120 /*
 121  * A wrapper is a proxy with a target object to which it generally forwards
 122  * operations, but may restrict access to certain operations or augment those
 123  * operations in various ways.
 124  *
 125  * A wrapper can be "unwrapped" in C++, exposing the underlying object.
 126  * Callers should be careful to avoid unwrapping security wrappers in the wrong
 127  * context.
 128  *
 129  * Important: If you add a method implementation here, you probably also need
 130  * to add an override in CrossCompartmentWrapper. If you don't, you risk
 131  * compartment mismatches. See bug 945826 comment 0.
 132  */
 133 class JS_PUBLIC_API Wrapper : public ForwardingProxyHandler {
 134   unsigned mFlags;
 135
 136  public:
 137   explicit constexpr Wrapper(unsigned aFlags, bool aHasPrototype = false,
 138                              bool aHasSecurityPolicy = false)
 139       : ForwardingProxyHandler(&family, aHasPrototype, aHasSecurityPolicy),
 140         mFlags(aFlags) {}
 141
 142   virtual bool finalizeInBackground(const JS::Value& priv) const override;
 143
 144   /**
 145    * A hook subclasses can override to implement CheckedUnwrapDynamic
 146    * behavior.  The JSContext represents the "who is trying to unwrap?" Realm.
 147    * The JSObject is the wrapper that the caller is trying to unwrap.
 148    */
 149   virtual bool dynamicCheckedUnwrapAllowed(JS::HandleObject obj,
 150                                            JSContext* cx) const {
 151     MOZ_ASSERT(hasSecurityPolicy(), "Why are you asking?");
 152     return false;
 153   }
 154
 155   using BaseProxyHandler::Action;
 156
 157   enum Flags { CROSS_COMPARTMENT = 1 << 0, LAST_USED_FLAG = CROSS_COMPARTMENT };
 158
 159   static JSObject* New(JSContext* cx, JSObject* obj, const Wrapper* handler,
 160                        const WrapperOptions& options = WrapperOptions());
 161
 162   static JSObject* Renew(JSObject* existing, JSObject* obj,
 163                          const Wrapper* handler);
 164
 165   static inline const Wrapper* wrapperHandler(const JSObject* wrapper);
 166
 167   static JSObject* wrappedObject(JSObject* wrapper);
 168
 169   unsigned flags() const { return mFlags; }
 170
 171   bool isCrossCompartmentWrapper() const {
 172     return !!(mFlags & CROSS_COMPARTMENT);
 173   }
 174
 175   static const char family;
 176   static const Wrapper singleton;
 177   static const Wrapper singletonWithPrototype;
 178
 179   static JSObject* const defaultProto;
 180 };
 181
 182 inline JSObject* WrapperOptions::proto() const {
 183   return proto_ ? *proto_ : Wrapper::defaultProto;
 184 }
 185
 186 /* Base class for all cross compartment wrapper handlers. */
 187 class JS_PUBLIC_API CrossCompartmentWrapper : public Wrapper {
 188  public:
 189   explicit constexpr CrossCompartmentWrapper(unsigned aFlags,
 190                                              bool aHasPrototype = false,
 191                                              bool aHasSecurityPolicy = false)
 192       : Wrapper(CROSS_COMPARTMENT | aFlags, aHasPrototype, aHasSecurityPolicy) {
 193   }
 194
 195   /* Standard internal methods. */
 196   virtual bool getOwnPropertyDescriptor(
 197       JSContext* cx, JS::HandleObject wrapper, JS::HandleId id,
 198       JS::MutableHandle<mozilla::Maybe<JS::PropertyDescriptor>> desc)
 199       const override;
 200   virtual bool defineProperty(JSContext* cx, JS::HandleObject wrapper,
 201                               JS::HandleId id,
 202                               JS::Handle<JS::PropertyDescriptor> desc,
 203                               JS::ObjectOpResult& result) const override;
 204   virtual bool ownPropertyKeys(JSContext* cx, JS::HandleObject wrapper,
 205                                JS::MutableHandleIdVector props) const override;
 206   virtual bool delete_(JSContext* cx, JS::HandleObject wrapper, JS::HandleId id,
 207                        JS::ObjectOpResult& result) const override;
 208   virtual bool enumerate(JSContext* cx, JS::HandleObject proxy,
 209                          JS::MutableHandleIdVector props) const override;
 210   virtual bool getPrototype(JSContext* cx, JS::HandleObject proxy,
 211                             JS::MutableHandleObject protop) const override;
 212   virtual bool setPrototype(JSContext* cx, JS::HandleObject proxy,
 213                             JS::HandleObject proto,
 214                             JS::ObjectOpResult& result) const override;
 215
 216   virtual bool getPrototypeIfOrdinary(
 217       JSContext* cx, JS::HandleObject proxy, bool* isOrdinary,
 218       JS::MutableHandleObject protop) const override;
 219   virtual bool setImmutablePrototype(JSContext* cx, JS::HandleObject proxy,
 220                                      bool* succeeded) const override;
 221   virtual bool preventExtensions(JSContext* cx, JS::HandleObject wrapper,
 222                                  JS::ObjectOpResult& result) const override;
 223   virtual bool isExtensible(JSContext* cx, JS::HandleObject wrapper,
 224                             bool* extensible) const override;
 225   virtual bool has(JSContext* cx, JS::HandleObject wrapper, JS::HandleId id,
 226                    bool* bp) const override;
 227   virtual bool get(JSContext* cx, JS::HandleObject wrapper,
 228                    JS::HandleValue receiver, JS::HandleId id,
 229                    JS::MutableHandleValue vp) const override;
 230   virtual bool set(JSContext* cx, JS::HandleObject wrapper, JS::HandleId id,
 231                    JS::HandleValue v, JS::HandleValue receiver,
 232                    JS::ObjectOpResult& result) const override;
 233   virtual bool call(JSContext* cx, JS::HandleObject wrapper,
 234                     const JS::CallArgs& args) const override;
 235   virtual bool construct(JSContext* cx, JS::HandleObject wrapper,
 236                          const JS::CallArgs& args) const override;
 237
 238   /* SpiderMonkey extensions. */
 239   virtual bool hasOwn(JSContext* cx, JS::HandleObject wrapper, JS::HandleId id,
 240                       bool* bp) const override;
 241   virtual bool getOwnEnumerablePropertyKeys(
 242       JSContext* cx, JS::HandleObject wrapper,
 243       JS::MutableHandleIdVector props) const override;
 244   virtual bool nativeCall(JSContext* cx, JS::IsAcceptableThis test,
 245                           JS::NativeImpl impl,
 246                           const JS::CallArgs& args) const override;
 247   virtual const char* className(JSContext* cx,
 248                                 JS::HandleObject proxy) const override;
 249   virtual JSString* fun_toString(JSContext* cx, JS::HandleObject wrapper,
 250                                  bool isToSource) const override;
 251   virtual RegExpShared* regexp_toShared(JSContext* cx,
 252                                         JS::HandleObject proxy) const override;
 253   virtual bool boxedValue_unbox(JSContext* cx, JS::HandleObject proxy,
 254                                 JS::MutableHandleValue vp) const override;
 255
 256   // Allocate CrossCompartmentWrappers in the nursery.
 257   virtual bool canNurseryAllocate() const override { return true; }
 258
 259   static const CrossCompartmentWrapper singleton;
 260   static const CrossCompartmentWrapper singletonWithPrototype;
 261 };
 262
 263 class JS_PUBLIC_API OpaqueCrossCompartmentWrapper
 264     : public CrossCompartmentWrapper {
 265  public:
 266   explicit constexpr OpaqueCrossCompartmentWrapper()
 267       : CrossCompartmentWrapper(0) {}
 268
 269   /* Standard internal methods. */
 270   virtual bool getOwnPropertyDescriptor(
 271       JSContext* cx, JS::HandleObject wrapper, JS::HandleId id,
 272       JS::MutableHandle<mozilla::Maybe<JS::PropertyDescriptor>> desc)
 273       const override;
 274   virtual bool defineProperty(JSContext* cx, JS::HandleObject wrapper,
 275                               JS::HandleId id,
 276                               JS::Handle<JS::PropertyDescriptor> desc,
 277                               JS::ObjectOpResult& result) const override;
 278   virtual bool ownPropertyKeys(JSContext* cx, JS::HandleObject wrapper,
 279                                JS::MutableHandleIdVector props) const override;
 280   virtual bool delete_(JSContext* cx, JS::HandleObject wrapper, JS::HandleId id,
 281                        JS::ObjectOpResult& result) const override;
 282   virtual bool enumerate(JSContext* cx, JS::HandleObject proxy,
 283                          JS::MutableHandleIdVector props) const override;
 284   virtual bool getPrototype(JSContext* cx, JS::HandleObject wrapper,
 285                             JS::MutableHandleObject protop) const override;
 286   virtual bool setPrototype(JSContext* cx, JS::HandleObject wrapper,
 287                             JS::HandleObject proto,
 288                             JS::ObjectOpResult& result) const override;
 289   virtual bool getPrototypeIfOrdinary(
 290       JSContext* cx, JS::HandleObject wrapper, bool* isOrdinary,
 291       JS::MutableHandleObject protop) const override;
 292   virtual bool setImmutablePrototype(JSContext* cx, JS::HandleObject wrapper,
 293                                      bool* succeeded) const override;
 294   virtual bool preventExtensions(JSContext* cx, JS::HandleObject wrapper,
 295                                  JS::ObjectOpResult& result) const override;
 296   virtual bool isExtensible(JSContext* cx, JS::HandleObject wrapper,
 297                             bool* extensible) const override;
 298   virtual bool has(JSContext* cx, JS::HandleObject wrapper, JS::HandleId id,
 299                    bool* bp) const override;
 300   virtual bool get(JSContext* cx, JS::HandleObject wrapper,
 301                    JS::HandleValue receiver, JS::HandleId id,
 302                    JS::MutableHandleValue vp) const override;
 303   virtual bool set(JSContext* cx, JS::HandleObject wrapper, JS::HandleId id,
 304                    JS::HandleValue v, JS::HandleValue receiver,
 305                    JS::ObjectOpResult& result) const override;
 306   virtual bool call(JSContext* cx, JS::HandleObject wrapper,
 307                     const JS::CallArgs& args) const override;
 308   virtual bool construct(JSContext* cx, JS::HandleObject wrapper,
 309                          const JS::CallArgs& args) const override;
 310
 311   /* SpiderMonkey extensions. */
 312   virtual bool hasOwn(JSContext* cx, JS::HandleObject wrapper, JS::HandleId id,
 313                       bool* bp) const override;
 314   virtual bool getOwnEnumerablePropertyKeys(
 315       JSContext* cx, JS::HandleObject wrapper,
 316       JS::MutableHandleIdVector props) const override;
 317   virtual bool getBuiltinClass(JSContext* cx, JS::HandleObject wrapper,
 318                                ESClass* cls) const override;
 319   virtual bool isArray(JSContext* cx, JS::HandleObject obj,
 320                        JS::IsArrayAnswer* answer) const override;
 321   virtual const char* className(JSContext* cx,
 322                                 JS::HandleObject wrapper) const override;
 323   virtual JSString* fun_toString(JSContext* cx, JS::HandleObject proxy,
 324                                  bool isToSource) const override;
 325
 326   static const OpaqueCrossCompartmentWrapper singleton;
 327 };
 328
 329 /*
 330  * Base class for security wrappers. A security wrapper is potentially hiding
 331  * all or part of some wrapped object thus SecurityWrapper defaults to denying
 332  * access to the wrappee. This is the opposite of Wrapper which tries to be
 333  * completely transparent.
 334  *
 335  * NB: Currently, only a few ProxyHandler operations are overridden to deny
 336  * access, relying on derived SecurityWrapper to block access when necessary.
 337  */
 338 template <class Base>
 339 class JS_PUBLIC_API SecurityWrapper : public Base {
 340  public:
 341   explicit constexpr SecurityWrapper(unsigned flags, bool hasPrototype = false)
 342       : Base(flags, hasPrototype, /* hasSecurityPolicy = */ true) {}
 343
 344   virtual bool enter(JSContext* cx, JS::HandleObject wrapper, JS::HandleId id,
 345                      Wrapper::Action act, bool mayThrow,
 346                      bool* bp) const override;
 347
 348   virtual bool defineProperty(JSContext* cx, JS::HandleObject wrapper,
 349                               JS::HandleId id,
 350                               JS::Handle<JS::PropertyDescriptor> desc,
 351                               JS::ObjectOpResult& result) const override;
 352   virtual bool isExtensible(JSContext* cx, JS::HandleObject wrapper,
 353                             bool* extensible) const override;
 354   virtual bool preventExtensions(JSContext* cx, JS::HandleObject wrapper,
 355                                  JS::ObjectOpResult& result) const override;
 356   virtual bool setPrototype(JSContext* cx, JS::HandleObject proxy,
 357                             JS::HandleObject proto,
 358                             JS::ObjectOpResult& result) const override;
 359   virtual bool setImmutablePrototype(JSContext* cx, JS::HandleObject proxy,
 360                                      bool* succeeded) const override;
 361
 362   virtual bool nativeCall(JSContext* cx, JS::IsAcceptableThis test,
 363                           JS::NativeImpl impl,
 364                           const JS::CallArgs& args) const override;
 365   virtual bool getBuiltinClass(JSContext* cx, JS::HandleObject wrapper,
 366                                ESClass* cls) const override;
 367   virtual bool isArray(JSContext* cx, JS::HandleObject wrapper,
 368                        JS::IsArrayAnswer* answer) const override;
 369   virtual RegExpShared* regexp_toShared(JSContext* cx,
 370                                         JS::HandleObject proxy) const override;
 371   virtual bool boxedValue_unbox(JSContext* cx, JS::HandleObject proxy,
 372                                 JS::MutableHandleValue vp) const override;
 373
 374   // Allow isCallable and isConstructor. They used to be class-level, and so
 375   // could not be guarded against.
 376
 377   /*
 378    * Allow our subclasses to select the superclass behavior they want without
 379    * needing to specify an exact superclass.
 380    */
 381   typedef Base Permissive;
 382   typedef SecurityWrapper<Base> Restrictive;
 383 };
 384
 385 typedef SecurityWrapper<CrossCompartmentWrapper>
 386     CrossCompartmentSecurityWrapper;
 387
 388 extern JSObject* TransparentObjectWrapper(JSContext* cx,
 389                                           JS::HandleObject existing,
 390                                           JS::HandleObject obj);
 391
 392 inline bool IsWrapper(const JSObject* obj) {
 393   return IsProxy(obj) && GetProxyHandler(obj)->family() == &Wrapper::family;
 394 }
 395
 396 inline bool IsCrossCompartmentWrapper(const JSObject* obj) {
 397   return IsWrapper(obj) &&
 398          (Wrapper::wrapperHandler(obj)->flags() & Wrapper::CROSS_COMPARTMENT);
 399 }
 400
 401 /* static */ inline const Wrapper* Wrapper::wrapperHandler(
 402     const JSObject* wrapper) {
 403   MOZ_ASSERT(IsWrapper(wrapper));
 404   return static_cast<const Wrapper*>(GetProxyHandler(wrapper));
 405 }
 406
 407 // Given a JSObject, returns that object stripped of wrappers. If
 408 // stopAtWindowProxy is true, then this returns the WindowProxy if it was
 409 // previously wrapped. Otherwise, this returns the first object for which
 410 // JSObject::isWrapper returns false.
 411 //
 412 // ExposeToActiveJS is called on wrapper targets to allow gray marking
 413 // assertions to work while an incremental GC is in progress, but this means
 414 // that this cannot be called from the GC or off the main thread.
 415 JS_PUBLIC_API JSObject* UncheckedUnwrap(JSObject* obj,
 416                                         bool stopAtWindowProxy = true,
 417                                         unsigned* flagsp = nullptr);
 418
 419 // Given a JSObject, returns that object stripped of wrappers, except
 420 // WindowProxy wrappers.  At each stage, the wrapper has the opportunity to veto
 421 // the unwrap. Null is returned if there are security wrappers that can't be
 422 // unwrapped.
 423 //
 424 // This does a static-only unwrap check: it basically checks whether _all_
 425 // globals in the wrapper's source compartment should be able to access the
 426 // wrapper target.  This won't necessarily return the right thing for the HTML
 427 // spec's cross-origin objects (WindowProxy and Location), but is fine to use
 428 // when failure to unwrap one of those objects wouldn't be a problem.  For
 429 // example, if you want to test whether your target object is a specific class
 430 // that's not WindowProxy or Location, you can use this.
 431 //
 432 // ExposeToActiveJS is called on wrapper targets to allow gray marking
 433 // assertions to work while an incremental GC is in progress, but this means
 434 // that this cannot be called from the GC or off the main thread.
 435 JS_PUBLIC_API JSObject* CheckedUnwrapStatic(JSObject* obj);
 436
 437 // Unwrap only the outermost security wrapper, with the same semantics as
 438 // above. This is the checked version of Wrapper::wrappedObject.
 439 JS_PUBLIC_API JSObject* UnwrapOneCheckedStatic(JSObject* obj);
 440
 441 // Given a JSObject, returns that object stripped of wrappers. At each stage,
 442 // the security wrapper has the opportunity to veto the unwrap. If
 443 // stopAtWindowProxy is true, then this returns the WindowProxy if it was
 444 // previously wrapped.  Null is returned if there are security wrappers that
 445 // can't be unwrapped.
 446 //
 447 // ExposeToActiveJS is called on wrapper targets to allow gray marking
 448 // assertions to work while an incremental GC is in progress, but this means
 449 // that this cannot be called from the GC or off the main thread.
 450 //
 451 // The JSContext argument will be used for dynamic checks (needed by WindowProxy
 452 // and Location) and should represent the Realm doing the unwrapping.  It is not
 453 // used to throw exceptions; this function never throws.
 454 //
 455 // This function may be able to GC (and the static analysis definitely thinks it
 456 // can), but it still takes a JSObject* argument, because some of its callers
 457 // would actually have a bit of a hard time producing a Rooted.  And it ends up
 458 // having to root internally anyway, because it wants to use the value in a loop
 459 // and you can't assign to a HandleObject.  What this means is that callers who
 460 // plan to use the argument object after they have called this function will
 461 // need to root it to avoid hazard failures, even though this function doesn't
 462 // require a Handle.
 463 JS_PUBLIC_API JSObject* CheckedUnwrapDynamic(JSObject* obj, JSContext* cx,
 464                                              bool stopAtWindowProxy = true);
 465
 466 // Unwrap only the outermost security wrapper, with the same semantics as
 467 // above. This is the checked version of Wrapper::wrappedObject.
 468 JS_PUBLIC_API JSObject* UnwrapOneCheckedDynamic(JS::HandleObject obj,
 469                                                 JSContext* cx,
 470                                                 bool stopAtWindowProxy = true);
 471
 472 // Given a JSObject, returns that object stripped of wrappers. This returns the
 473 // WindowProxy if it was previously wrapped.
 474 //
 475 // ExposeToActiveJS is not called on wrapper targets so this can be called from
 476 // the GC or off the main thread.
 477 JS_PUBLIC_API JSObject* UncheckedUnwrapWithoutExpose(JSObject* obj);
 478
 479 void ReportAccessDenied(JSContext* cx);
 480
 481 JS_PUBLIC_API void NukeCrossCompartmentWrapper(JSContext* cx,
 482                                                JSObject* wrapper);
 483
 484 // If a cross-compartment wrapper source => target exists, nuke it.
 485 JS_PUBLIC_API void NukeCrossCompartmentWrapperIfExists(JSContext* cx,
 486                                                        JS::Compartment* source,
 487                                                        JSObject* target);
 488
 489 void RemapWrapper(JSContext* cx, JSObject* wobj, JSObject* newTarget);
 490 void RemapDeadWrapper(JSContext* cx, JS::HandleObject wobj,
 491                       JS::HandleObject newTarget);
 492
 493 JS_PUBLIC_API bool RemapAllWrappersForObject(JSContext* cx,
 494                                              JS::HandleObject oldTarget,
 495                                              JS::HandleObject newTarget);
 496
 497 // API to recompute all cross-compartment wrappers whose source and target
 498 // match the given filters.
 499 JS_PUBLIC_API bool RecomputeWrappers(JSContext* cx,
 500                                      const CompartmentFilter& sourceFilter,
 501                                      const CompartmentFilter& targetFilter);
 502
 503 } /* namespace js */
 504
 505 #endif /* js_Wrapper_h */