runtime/JSPromiseDeferred.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 JSPromiseDeferred_h
  27 #define JSPromiseDeferred_h
  28
  29 #if ENABLE(PROMISES)
  30
  31 #include "JSCell.h"
  32 #include "Structure.h"
  33
  34 namespace JSC {
  35
  36 class JSPromiseDeferred : public JSCell {
  37 public:
  38     typedef JSCell Base;
  39
  40     JS_EXPORT_PRIVATE static JSPromiseDeferred* create(ExecState*, JSGlobalObject*);
  41     JS_EXPORT_PRIVATE static JSPromiseDeferred* create(VM&, JSObject* promise, JSValue resolve, JSValue reject);
  42
  43     static Structure* createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
  44     {
  45         return Structure::create(vm, globalObject, prototype, TypeInfo(CompoundType, StructureFlags), info());
  46     }
  47
  48     static const bool hasImmortalStructure = true;
  49
  50     DECLARE_EXPORT_INFO;
  51
  52     JSObject* promise() const { return m_promise.get(); }
  53     JSValue resolve() const { return m_resolve.get(); }
  54     JSValue reject() const { return m_reject.get(); }
  55
  56 private:
  57     JSPromiseDeferred(VM&);
  58     void finishCreation(VM&, JSObject*, JSValue, JSValue);
  59     static const unsigned StructureFlags = OverridesVisitChildren | Base::StructureFlags;
  60     static void visitChildren(JSCell*, SlotVisitor&);
  61
  62     WriteBarrier<JSObject> m_promise;
  63     WriteBarrier<Unknown> m_resolve;
  64     WriteBarrier<Unknown> m_reject;
  65 };
  66
  67 enum ThenableStatus {
  68     WasAThenable,
  69     NotAThenable
  70 };
  71
  72 JSValue createJSPromiseDeferredFromConstructor(ExecState*, JSValue constructor);
  73 ThenableStatus updateDeferredFromPotentialThenable(ExecState*, JSValue, JSPromiseDeferred*);
  74
  75 void performDeferredResolve(ExecState*, JSPromiseDeferred*, JSValue argument);
  76 void performDeferredReject(ExecState*, JSPromiseDeferred*, JSValue argument);
  77
  78 JSValue abruptRejection(ExecState*, JSPromiseDeferred*);
  79
  80 } // namespace JSC
  81
  82 #endif // ENABLE(PROMISES)
  83
  84 #endif // JSPromiseDeferred_h