1  /*
 2   * Copyright (C) 2017 Apple Inc.  All rights reserved.
 3   *
 4   * Redistribution and use in source and binary forms, with or without
 5   * modification, are permitted provided that the following conditions
 6   * are met:
 7   * 1. Redistributions of source code must retain the above copyright
 8   *    notice, this list of conditions and the following disclaimer.
 9   * 2. Redistributions in binary form must reproduce the above copyright
10   *    notice, this list of conditions and the following disclaimer in the
11   *    documentation and/or other materials provided with the distribution.
12   *
13   * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
14   * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16   * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
17   * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18   * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19   * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20   * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21   * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
24   */
25  
26  #include "config.h"
27  #include "JSWeakPrivate.h"
28  
29  #include "APICast.h"
30  #include "Weak.h"
31  #include <wtf/ThreadSafeRefCounted.h>
32  
33  using namespace JSC;
34  
35  struct OpaqueJSWeak : ThreadSafeRefCounted<OpaqueJSWeak> {
36      OpaqueJSWeak(JSObject* object)
37          : weak(object)
38      {
39      }
40      
41      Weak<JSObject> weak;
42  };
43  
44  JSWeakRef JSWeakCreate(JSContextGroupRef contextGroup, JSObjectRef objectRef)
45  {
46      VM* vm = toJS(contextGroup);
47      JSLockHolder locker(vm);
48      return new OpaqueJSWeak(toJS(objectRef));
49  }
50  
51  void JSWeakRetain(JSContextGroupRef contextGroup, JSWeakRef weakRef)
52  {
53      VM* vm = toJS(contextGroup);
54      JSLockHolder locker(vm);
55      weakRef->ref();
56  }
57  
58  void JSWeakRelease(JSContextGroupRef contextGroup, JSWeakRef weakRef)
59  {
60      VM* vm = toJS(contextGroup);
61      JSLockHolder locker(vm);
62      weakRef->deref();
63  }
64  
65  JSObjectRef JSWeakGetObject(JSWeakRef weakRef)
66  {
67      return toRef(weakRef->weak.get());
68  }
69