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. ``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#ifndef APICallbackFunction_h
27#define APICallbackFunction_h
28
29#include "APICast.h"
30#include "Error.h"
31#include "JSCallbackConstructor.h"
32#include "JSLock.h"
33#include <wtf/Vector.h>
34
35namespace JSC {
36
37struct APICallbackFunction {
38
39template <typename T> static EncodedJSValue JSC_HOST_CALL call(ExecState*);
40template <typename T> static EncodedJSValue JSC_HOST_CALL construct(ExecState*);
41
42};
43
44template <typename T>
45EncodedJSValue JSC_HOST_CALL APICallbackFunction::call(ExecState* exec)
46{
47    JSContextRef execRef = toRef(exec);
48    JSObjectRef functionRef = toRef(exec->callee());
49    JSObjectRef thisObjRef = toRef(jsCast<JSObject*>(exec->thisValue().toThis(exec, NotStrictMode)));
50
51    int argumentCount = static_cast<int>(exec->argumentCount());
52    Vector<JSValueRef, 16> arguments;
53    arguments.reserveInitialCapacity(argumentCount);
54    for (int i = 0; i < argumentCount; i++)
55        arguments.uncheckedAppend(toRef(exec, exec->uncheckedArgument(i)));
56
57    JSValueRef exception = 0;
58    JSValueRef result;
59    {
60        JSLock::DropAllLocks dropAllLocks(exec);
61        result = jsCast<T*>(toJS(functionRef))->functionCallback()(execRef, functionRef, thisObjRef, argumentCount, arguments.data(), &exception);
62    }
63    if (exception)
64        exec->vm().throwException(exec, toJS(exec, exception));
65
66    // result must be a valid JSValue.
67    if (!result)
68        return JSValue::encode(jsUndefined());
69
70    return JSValue::encode(toJS(exec, result));
71}
72
73template <typename T>
74EncodedJSValue JSC_HOST_CALL APICallbackFunction::construct(ExecState* exec)
75{
76    JSObject* constructor = exec->callee();
77    JSContextRef ctx = toRef(exec);
78    JSObjectRef constructorRef = toRef(constructor);
79
80    JSObjectCallAsConstructorCallback callback = jsCast<T*>(constructor)->constructCallback();
81    if (callback) {
82        size_t argumentCount = exec->argumentCount();
83        Vector<JSValueRef, 16> arguments;
84        arguments.reserveInitialCapacity(argumentCount);
85        for (size_t i = 0; i < argumentCount; ++i)
86            arguments.uncheckedAppend(toRef(exec, exec->uncheckedArgument(i)));
87
88        JSValueRef exception = 0;
89        JSObjectRef result;
90        {
91            JSLock::DropAllLocks dropAllLocks(exec);
92            result = callback(ctx, constructorRef, argumentCount, arguments.data(), &exception);
93        }
94        if (exception) {
95            exec->vm().throwException(exec, toJS(exec, exception));
96            return JSValue::encode(toJS(exec, exception));
97        }
98        // result must be a valid JSValue.
99        if (!result)
100            return throwVMTypeError(exec);
101        return JSValue::encode(toJS(result));
102    }
103
104    return JSValue::encode(toJS(JSObjectMake(ctx, jsCast<JSCallbackConstructor*>(constructor)->classRef(), 0)));
105}
106
107} // namespace JSC
108
109#endif // APICallbackFunction_h
110