tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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WindowProxy.cpp (2266B)

      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 /* WindowProxy and Window implementation, for the web browser embedding. */
      8 
      9 #include "js/friend/WindowProxy.h"
     10 
     11 #include "mozilla/Assertions.h"  // MOZ_ASSERT
     12 
     13 #include "js/Context.h"       // js::AssertHeapIsIdle
     14 #include "vm/GlobalObject.h"  // js::GlobalObject
     15 #include "vm/JSContext.h"     // JSContext, CHECK_THREAD
     16 #include "vm/JSObject.h"      // JSObject
     17 #include "vm/Runtime.h"       // JSRuntime
     18 
     19 #include "vm/JSContext-inl.h"  // JSContext::check
     20 #include "vm/JSObject-inl.h"   // JSObject::nonCCWGlobal
     21 
     22 using JS::Handle;
     23 
     24 void js::SetWindowProxyClass(JSContext* cx, const JSClass* clasp) {
     25  MOZ_ASSERT(!cx->runtime()->maybeWindowProxyClass());
     26  cx->runtime()->setWindowProxyClass(clasp);
     27 }
     28 
     29 void js::SetWindowProxy(JSContext* cx, Handle<JSObject*> global,
     30                        Handle<JSObject*> windowProxy) {
     31  AssertHeapIsIdle();
     32  CHECK_THREAD(cx);
     33 
     34  cx->check(global, windowProxy);
     35  MOZ_ASSERT(IsWindowProxy(windowProxy));
     36 
     37  GlobalObject& globalObj = global->as<GlobalObject>();
     38  if (globalObj.maybeWindowProxy() != windowProxy) {
     39    globalObj.setWindowProxy(windowProxy);
     40    globalObj.lexicalEnvironment().setWindowProxyThisObject(windowProxy);
     41  }
     42 }
     43 
     44 JSObject* js::ToWindowIfWindowProxy(JSObject* obj) {
     45  if (IsWindowProxy(obj)) {
     46    return &obj->nonCCWGlobal();
     47  }
     48 
     49  return obj;
     50 }
     51 
     52 JSObject* js::detail::ToWindowProxyIfWindowSlow(JSObject* obj) {
     53  if (JSObject* windowProxy = obj->as<GlobalObject>().maybeWindowProxy()) {
     54    return windowProxy;
     55  }
     56 
     57  return obj;
     58 }
     59 
     60 bool js::IsWindowProxy(JSObject* obj) {
     61  // Note: simply checking `obj == obj->global().windowProxy()` is not
     62  // sufficient: we may have transplanted the window proxy with a CCW.
     63  // Check the Class to ensure we really have a window proxy.
     64  return obj->getClass() ==
     65         obj->runtimeFromAnyThread()->maybeWindowProxyClass();
     66 }
     67 
     68 bool js::detail::IsWindowSlow(JSObject* obj) {
     69  return obj->as<GlobalObject>().maybeWindowProxy();
     70 }