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#include "config.h"
27#include "JSPromiseReaction.h"
28
29#if ENABLE(PROMISES)
30
31#include "Error.h"
32#include "JSCJSValueInlines.h"
33#include "JSCellInlines.h"
34#include "JSGlobalObject.h"
35#include "JSPromiseDeferred.h"
36#include "Microtask.h"
37#include "SlotVisitorInlines.h"
38#include "StrongInlines.h"
39
40namespace JSC {
41
42class ExecutePromiseReactionMicrotask final : public Microtask {
43public:
44    ExecutePromiseReactionMicrotask(VM& vm, JSPromiseReaction* reaction, JSValue argument)
45    {
46        m_reaction.set(vm, reaction);
47        m_argument.set(vm, argument);
48    }
49
50    virtual ~ExecutePromiseReactionMicrotask()
51    {
52    }
53
54private:
55    virtual void run(ExecState*) override;
56
57    Strong<JSPromiseReaction> m_reaction;
58    Strong<Unknown> m_argument;
59};
60
61PassRefPtr<Microtask> createExecutePromiseReactionMicrotask(VM& vm, JSPromiseReaction* reaction, JSValue argument)
62{
63    return adoptRef(new ExecutePromiseReactionMicrotask(vm, reaction, argument));
64}
65
66void ExecutePromiseReactionMicrotask::run(ExecState* exec)
67{
68    // 1. Let 'deferred' be reaction.[[Deferred]].
69    JSPromiseDeferred* deferred = m_reaction->deferred();
70
71    // 2. Let 'handler' be reaction.[[Handler]].
72    JSValue handler = m_reaction->handler();
73
74    // 3. Let 'handlerResult' be the result of calling the [[Call]] internal method of
75    //    handler passing undefined as thisArgument and a List containing argument as
76    //    argumentsList.
77
78    CallData handlerCallData;
79    CallType handlerCallType = getCallData(handler, handlerCallData);
80    ASSERT(handlerCallType != CallTypeNone);
81
82    MarkedArgumentBuffer handlerArguments;
83    handlerArguments.append(m_argument.get());
84
85    JSValue handlerResult = call(exec, handler, handlerCallType, handlerCallData, jsUndefined(), handlerArguments);
86
87    // 4. If handlerResult is an abrupt completion, return the result of calling the
88    //    [[Call]] internal method of deferred.[[Reject]] passing undefined as thisArgument
89    //    and a List containing handlerResult.[[value]] as argumentsList.
90    if (exec->hadException()) {
91        JSValue exception = exec->exception();
92        exec->clearException();
93
94        performDeferredReject(exec, deferred, exception);
95    }
96
97    // 5. Let 'handlerResult' be handlerResult.[[value]].
98    // Note: Nothing to do.
99
100    // 6. If SameValue(handlerResult, deferred.[[Promise]]) is true,
101    if (sameValue(exec, handlerResult, deferred->promise())) {
102        // i. Let 'selfResolutionError' be a newly-created TypeError object.
103        JSObject* selfResolutionError = createTypeError(exec, ASCIILiteral("Resolve a promise with itself"));
104
105        // ii. Return the result of calling the [[Call]] internal method of deferred.[[Reject]] passing
106        //     undefined as thisArgument and a List containing selfResolutionError as argumentsList.
107        performDeferredReject(exec, deferred, selfResolutionError);
108    }
109
110    // 7. Let 'updateResult' be the result of calling UpdateDeferredFromPotentialThenable(handlerResult, deferred).
111    ThenableStatus updateResult = updateDeferredFromPotentialThenable(exec, handlerResult, deferred);
112
113    // 8. ReturnIfAbrupt(updateResult).
114    if (exec->hadException())
115        return;
116
117    // 9. If 'updateResult' is "not a thenable",
118    if (updateResult == NotAThenable) {
119        // i. Return the result of calling the [[Call]] internal method of deferred.[[Resolve]]
120        //    passing undefined as thisArgument and a List containing handlerResult as argumentsList.
121        performDeferredResolve(exec, deferred, handlerResult);
122    }
123}
124
125
126const ClassInfo JSPromiseReaction::s_info = { "JSPromiseReaction", 0, 0, 0, CREATE_METHOD_TABLE(JSPromiseReaction) };
127
128JSPromiseReaction* JSPromiseReaction::create(VM& vm, JSPromiseDeferred* deferred, JSValue handler)
129{
130    JSPromiseReaction* promiseReaction = new (NotNull, allocateCell<JSPromiseReaction>(vm.heap)) JSPromiseReaction(vm);
131    promiseReaction->finishCreation(vm, deferred, handler);
132    return promiseReaction;
133}
134
135JSPromiseReaction::JSPromiseReaction(VM& vm)
136    : Base(vm, vm.promiseReactionStructure.get())
137{
138}
139
140void JSPromiseReaction::finishCreation(VM& vm, JSPromiseDeferred* deferred, JSValue handler)
141{
142    Base::finishCreation(vm);
143    m_deferred.set(vm, this, deferred);
144    m_handler.set(vm, this, handler);
145}
146
147void JSPromiseReaction::visitChildren(JSCell* cell, SlotVisitor& visitor)
148{
149    JSPromiseReaction* thisObject = jsCast<JSPromiseReaction*>(cell);
150    ASSERT_GC_OBJECT_INHERITS(thisObject, info());
151    COMPILE_ASSERT(StructureFlags & OverridesVisitChildren, OverridesVisitChildrenWithoutSettingFlag);
152    ASSERT(thisObject->structure()->typeInfo().overridesVisitChildren());
153
154    Base::visitChildren(thisObject, visitor);
155
156    visitor.append(&thisObject->m_deferred);
157    visitor.append(&thisObject->m_handler);
158}
159
160} // namespace JSC
161
162#endif // ENABLE(PROMISES)
163