1/*
2 * Copyright (C) 2003, 2008, 2009 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 COMPUTER, 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 COMPUTER, 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 "runtime_object.h"
28
29#include "JSDOMBinding.h"
30#include "runtime_method.h"
31#include <runtime/Error.h>
32
33using namespace WebCore;
34
35namespace JSC {
36namespace Bindings {
37
38const ClassInfo RuntimeObject::s_info = { "RuntimeObject", &Base::s_info, 0, 0, CREATE_METHOD_TABLE(RuntimeObject) };
39
40RuntimeObject::RuntimeObject(ExecState*, JSGlobalObject* globalObject, Structure* structure, PassRefPtr<Instance> instance)
41    : JSDestructibleObject(globalObject->vm(), structure)
42    , m_instance(instance)
43{
44}
45
46void RuntimeObject::finishCreation(JSGlobalObject* globalObject)
47{
48    Base::finishCreation(globalObject->vm());
49    ASSERT(inherits(&s_info));
50}
51
52void RuntimeObject::destroy(JSCell* cell)
53{
54    static_cast<RuntimeObject*>(cell)->RuntimeObject::~RuntimeObject();
55}
56
57void RuntimeObject::invalidate()
58{
59    ASSERT(m_instance);
60    if (m_instance)
61        m_instance->willInvalidateRuntimeObject();
62    m_instance = 0;
63}
64
65JSValue RuntimeObject::fallbackObjectGetter(ExecState* exec, JSValue slotBase, PropertyName propertyName)
66{
67    RuntimeObject* thisObj = static_cast<RuntimeObject*>(asObject(slotBase));
68    RefPtr<Instance> instance = thisObj->m_instance;
69
70    if (!instance)
71        return throwInvalidAccessError(exec);
72
73    instance->begin();
74
75    Class *aClass = instance->getClass();
76    JSValue result = aClass->fallbackObject(exec, instance.get(), propertyName);
77
78    instance->end();
79
80    return result;
81}
82
83JSValue RuntimeObject::fieldGetter(ExecState* exec, JSValue slotBase, PropertyName propertyName)
84{
85    RuntimeObject* thisObj = static_cast<RuntimeObject*>(asObject(slotBase));
86    RefPtr<Instance> instance = thisObj->m_instance;
87
88    if (!instance)
89        return throwInvalidAccessError(exec);
90
91    instance->begin();
92
93    Class *aClass = instance->getClass();
94    Field* aField = aClass->fieldNamed(propertyName, instance.get());
95    JSValue result = aField->valueFromInstance(exec, instance.get());
96
97    instance->end();
98
99    return result;
100}
101
102JSValue RuntimeObject::methodGetter(ExecState* exec, JSValue slotBase, PropertyName propertyName)
103{
104    RuntimeObject* thisObj = static_cast<RuntimeObject*>(asObject(slotBase));
105    RefPtr<Instance> instance = thisObj->m_instance;
106
107    if (!instance)
108        return throwInvalidAccessError(exec);
109
110    instance->begin();
111
112    JSValue method = instance->getMethod(exec, propertyName);
113
114    instance->end();
115
116    return method;
117}
118
119bool RuntimeObject::getOwnPropertySlot(JSCell* cell, ExecState *exec, PropertyName propertyName, PropertySlot& slot)
120{
121    RuntimeObject* thisObject = jsCast<RuntimeObject*>(cell);
122    if (!thisObject->m_instance) {
123        throwInvalidAccessError(exec);
124        return false;
125    }
126
127    RefPtr<Instance> instance = thisObject->m_instance;
128
129    instance->begin();
130
131    Class *aClass = instance->getClass();
132
133    if (aClass) {
134        // See if the instance has a field with the specified name.
135        Field *aField = aClass->fieldNamed(propertyName, instance.get());
136        if (aField) {
137            slot.setCustom(thisObject, thisObject->fieldGetter);
138            instance->end();
139            return true;
140        } else {
141            // Now check if a method with specified name exists, if so return a function object for
142            // that method.
143            if (aClass->methodNamed(propertyName, instance.get())) {
144                slot.setCustom(thisObject, thisObject->methodGetter);
145
146                instance->end();
147                return true;
148            }
149        }
150
151        // Try a fallback object.
152        if (!aClass->fallbackObject(exec, instance.get(), propertyName).isUndefined()) {
153            slot.setCustom(thisObject, thisObject->fallbackObjectGetter);
154            instance->end();
155            return true;
156        }
157    }
158
159    instance->end();
160
161    return instance->getOwnPropertySlot(thisObject, exec, propertyName, slot);
162}
163
164bool RuntimeObject::getOwnPropertyDescriptor(JSObject* object, ExecState *exec, PropertyName propertyName, PropertyDescriptor& descriptor)
165{
166    RuntimeObject* thisObject = jsCast<RuntimeObject*>(object);
167    if (!thisObject->m_instance) {
168        throwInvalidAccessError(exec);
169        return false;
170    }
171
172    RefPtr<Instance> instance = thisObject->m_instance;
173    instance->begin();
174
175    Class *aClass = instance->getClass();
176
177    if (aClass) {
178        // See if the instance has a field with the specified name.
179        Field *aField = aClass->fieldNamed(propertyName, instance.get());
180        if (aField) {
181            PropertySlot slot;
182            slot.setCustom(thisObject, fieldGetter);
183            instance->end();
184            descriptor.setDescriptor(slot.getValue(exec, propertyName), DontDelete);
185            return true;
186        } else {
187            // Now check if a method with specified name exists, if so return a function object for
188            // that method.
189            if (aClass->methodNamed(propertyName, instance.get())) {
190                PropertySlot slot;
191                slot.setCustom(thisObject, methodGetter);
192                instance->end();
193                descriptor.setDescriptor(slot.getValue(exec, propertyName), DontDelete | ReadOnly);
194                return true;
195            }
196        }
197
198        // Try a fallback object.
199        if (!aClass->fallbackObject(exec, instance.get(), propertyName).isUndefined()) {
200            PropertySlot slot;
201            slot.setCustom(thisObject, fallbackObjectGetter);
202            instance->end();
203            descriptor.setDescriptor(slot.getValue(exec, propertyName), DontDelete | ReadOnly | DontEnum);
204            return true;
205        }
206    }
207
208    instance->end();
209
210    return instance->getOwnPropertyDescriptor(thisObject, exec, propertyName, descriptor);
211}
212
213void RuntimeObject::put(JSCell* cell, ExecState* exec, PropertyName propertyName, JSValue value, PutPropertySlot& slot)
214{
215    RuntimeObject* thisObject = jsCast<RuntimeObject*>(cell);
216    if (!thisObject->m_instance) {
217        throwInvalidAccessError(exec);
218        return;
219    }
220
221    RefPtr<Instance> instance = thisObject->m_instance;
222    instance->begin();
223
224    // Set the value of the property.
225    Field *aField = instance->getClass()->fieldNamed(propertyName, instance.get());
226    if (aField)
227        aField->setValueToInstance(exec, instance.get(), value);
228    else if (!instance->setValueOfUndefinedField(exec, propertyName, value))
229        instance->put(thisObject, exec, propertyName, value, slot);
230
231    instance->end();
232}
233
234bool RuntimeObject::deleteProperty(JSCell*, ExecState*, PropertyName)
235{
236    // Can never remove a property of a RuntimeObject.
237    return false;
238}
239
240JSValue RuntimeObject::defaultValue(const JSObject* object, ExecState* exec, PreferredPrimitiveType hint)
241{
242    const RuntimeObject* thisObject = jsCast<const RuntimeObject*>(object);
243    if (!thisObject->m_instance)
244        return throwInvalidAccessError(exec);
245
246    RefPtr<Instance> instance = thisObject->m_instance;
247
248    instance->begin();
249    JSValue result = instance->defaultValue(exec, hint);
250    instance->end();
251    return result;
252}
253
254static EncodedJSValue JSC_HOST_CALL callRuntimeObject(ExecState* exec)
255{
256    ASSERT(exec->callee()->inherits(&RuntimeObject::s_info));
257    RefPtr<Instance> instance(static_cast<RuntimeObject*>(exec->callee())->getInternalInstance());
258    instance->begin();
259    JSValue result = instance->invokeDefaultMethod(exec);
260    instance->end();
261    return JSValue::encode(result);
262}
263
264CallType RuntimeObject::getCallData(JSCell* cell, CallData& callData)
265{
266    RuntimeObject* thisObject = jsCast<RuntimeObject*>(cell);
267    if (!thisObject->m_instance)
268        return CallTypeNone;
269
270    RefPtr<Instance> instance = thisObject->m_instance;
271    if (!instance->supportsInvokeDefaultMethod())
272        return CallTypeNone;
273
274    callData.native.function = callRuntimeObject;
275    return CallTypeHost;
276}
277
278static EncodedJSValue JSC_HOST_CALL callRuntimeConstructor(ExecState* exec)
279{
280    JSObject* constructor = exec->callee();
281    ASSERT(constructor->inherits(&RuntimeObject::s_info));
282    RefPtr<Instance> instance(static_cast<RuntimeObject*>(exec->callee())->getInternalInstance());
283    instance->begin();
284    ArgList args(exec);
285    JSValue result = instance->invokeConstruct(exec, args);
286    instance->end();
287
288    ASSERT(result);
289    return JSValue::encode(result.isObject() ? jsCast<JSObject*>(result.asCell()) : constructor);
290}
291
292ConstructType RuntimeObject::getConstructData(JSCell* cell, ConstructData& constructData)
293{
294    RuntimeObject* thisObject = jsCast<RuntimeObject*>(cell);
295    if (!thisObject->m_instance)
296        return ConstructTypeNone;
297
298    RefPtr<Instance> instance = thisObject->m_instance;
299    if (!instance->supportsConstruct())
300        return ConstructTypeNone;
301
302    constructData.native.function = callRuntimeConstructor;
303    return ConstructTypeHost;
304}
305
306void RuntimeObject::getOwnPropertyNames(JSObject* object, ExecState* exec, PropertyNameArray& propertyNames, EnumerationMode)
307{
308    RuntimeObject* thisObject = jsCast<RuntimeObject*>(object);
309    if (!thisObject->m_instance) {
310        throwInvalidAccessError(exec);
311        return;
312    }
313
314    RefPtr<Instance> instance = thisObject->m_instance;
315
316    instance->begin();
317    instance->getPropertyNames(exec, propertyNames);
318    instance->end();
319}
320
321JSObject* RuntimeObject::throwInvalidAccessError(ExecState* exec)
322{
323    return throwError(exec, createReferenceError(exec, "Trying to access object from destroyed plug-in."));
324}
325
326}
327}
328