runtime/JSPromise.h

   1 /*
   2  * Copyright (C) 2013 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. AND ITS CONTRIBUTORS ``AS IS''
  14  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  15  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
  17  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  18  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  19  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  20  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  21  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  22  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  23  * THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #ifndef JSPromise_h
  27 #define JSPromise_h
  28
  29 #if ENABLE(PROMISES)
  30
  31 #include "JSDestructibleObject.h"
  32
  33 namespace JSC {
  34
  35 class JSPromiseReaction;
  36 class JSPromiseConstructor;
  37
  38 class JSPromise : public JSDestructibleObject {
  39 public:
  40     typedef JSDestructibleObject Base;
  41
  42     static JSPromise* create(VM&, JSGlobalObject*, JSPromiseConstructor*);
  43     static Structure* createStructure(VM&, JSGlobalObject*, JSValue);
  44
  45     DECLARE_INFO;
  46
  47     enum class Status {
  48         Unresolved,
  49         HasResolution,
  50         HasRejection
  51     };
  52
  53     Status status() const
  54     {
  55         return m_status;
  56     }
  57
  58     JSValue result() const
  59     {
  60         ASSERT(m_status != Status::Unresolved);
  61         return m_result.get();
  62     }
  63
  64     JSPromiseConstructor* constructor() const
  65     {
  66         return m_constructor.get();
  67     }
  68
  69     void reject(VM&, JSValue);
  70     void resolve(VM&, JSValue);
  71
  72     void appendResolveReaction(VM&, JSPromiseReaction*);
  73     void appendRejectReaction(VM&, JSPromiseReaction*);
  74
  75 private:
  76     JSPromise(VM&, Structure*);
  77     void finishCreation(VM&, JSPromiseConstructor*);
  78     static const unsigned StructureFlags = OverridesVisitChildren | JSObject::StructureFlags;
  79     static void destroy(JSCell*);
  80     static void visitChildren(JSCell*, SlotVisitor&);
  81
  82     Status m_status;
  83     WriteBarrier<Unknown> m_result;
  84     WriteBarrier<JSPromiseConstructor> m_constructor;
  85     Vector<WriteBarrier<JSPromiseReaction>> m_resolveReactions;
  86     Vector<WriteBarrier<JSPromiseReaction>> m_rejectReactions;
  87 };
  88
  89 } // namespace JSC
  90
  91 #endif // ENABLE(PROMISES)
  92
  93 #endif // JSPromise_h