1/*
2 * Copyright (C) 2006, 2007 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 "JSContextRef.h"
28#include "JSContextRefPrivate.h"
29
30#include "APICast.h"
31#include "InitializeThreading.h"
32#include "JSCallbackObject.h"
33#include "JSClassRef.h"
34#include "JSGlobalObject.h"
35#include "JSObject.h"
36#include <wtf/Platform.h>
37
38#if OS(DARWIN)
39#include <mach-o/dyld.h>
40
41static const int32_t webkitFirstVersionWithConcurrentGlobalContexts = 0x2100500; // 528.5.0
42#endif
43
44using namespace JSC;
45
46JSContextGroupRef JSContextGroupCreate()
47{
48 initializeThreading();
49 return toRef(g: JSGlobalData::createNonDefault().releaseRef());
50}
51
52JSContextGroupRef JSContextGroupRetain(JSContextGroupRef group)
53{
54 toJS(g: group)->ref();
55 return group;
56}
57
58void JSContextGroupRelease(JSContextGroupRef group)
59{
60 toJS(g: group)->deref();
61}
62
63JSGlobalContextRef JSGlobalContextCreate(JSClassRef globalObjectClass)
64{
65 initializeThreading();
66#if OS(DARWIN)
67 // When running on Tiger or Leopard, or if the application was linked before JSGlobalContextCreate was changed
68 // to use a unique JSGlobalData, we use a shared one for compatibility.
69#if !defined(BUILDING_ON_TIGER) && !defined(BUILDING_ON_LEOPARD)
70 if (NSVersionOfLinkTimeLibrary("JavaScriptCore") <= webkitFirstVersionWithConcurrentGlobalContexts) {
71#else
72 {
73#endif
74 JSLock lock(LockForReal);
75 return JSGlobalContextCreateInGroup(toRef(&JSGlobalData::sharedInstance()), globalObjectClass);
76 }
77#endif // OS(DARWIN)
78
79 return JSGlobalContextCreateInGroup(group: 0, globalObjectClass);
80}
81
82JSGlobalContextRef JSGlobalContextCreateInGroup(JSContextGroupRef group, JSClassRef globalObjectClass)
83{
84 initializeThreading();
85
86 JSLock lock(LockForReal);
87 RefPtr<JSGlobalData> globalData = group ? PassRefPtr<JSGlobalData>(toJS(g: group)) : JSGlobalData::createNonDefault();
88
89 APIEntryShim entryShim(globalData.get(), false);
90
91#if ENABLE(JSC_MULTIPLE_THREADS)
92 globalData->makeUsableFromMultipleThreads();
93#endif
94
95 if (!globalObjectClass) {
96 JSGlobalObject* globalObject = new (globalData.get()) JSGlobalObject;
97 return JSGlobalContextRetain(ctx: toGlobalRef(e: globalObject->globalExec()));
98 }
99
100 JSGlobalObject* globalObject = new (globalData.get()) JSCallbackObject<JSGlobalObject>(globalObjectClass);
101 ExecState* exec = globalObject->globalExec();
102 JSValue prototype = globalObjectClass->prototype(exec);
103 if (!prototype)
104 prototype = jsNull();
105 globalObject->resetPrototype(prototype);
106 return JSGlobalContextRetain(ctx: toGlobalRef(e: exec));
107}
108
109JSGlobalContextRef JSGlobalContextRetain(JSGlobalContextRef ctx)
110{
111 ExecState* exec = toJS(c: ctx);
112 APIEntryShim entryShim(exec);
113
114 JSGlobalData& globalData = exec->globalData();
115 gcProtect(val: exec->dynamicGlobalObject());
116 globalData.ref();
117 return ctx;
118}
119
120void JSGlobalContextRelease(JSGlobalContextRef ctx)
121{
122 ExecState* exec = toJS(c: ctx);
123 APIEntryShim entryShim(exec, false);
124
125 gcUnprotect(val: exec->dynamicGlobalObject());
126
127 JSGlobalData& globalData = exec->globalData();
128 if (globalData.refCount() == 2) { // One reference is held by JSGlobalObject, another added by JSGlobalContextRetain().
129 // The last reference was released, this is our last chance to collect.
130 globalData.heap.destroy();
131 } else
132 globalData.heap.collectAllGarbage();
133
134 globalData.deref();
135}
136
137JSObjectRef JSContextGetGlobalObject(JSContextRef ctx)
138{
139 ExecState* exec = toJS(c: ctx);
140 APIEntryShim entryShim(exec);
141
142 // It is necessary to call toThisObject to get the wrapper object when used with WebCore.
143 return toRef(o: exec->lexicalGlobalObject()->toThisObject(exec));
144}
145
146JSContextGroupRef JSContextGetGroup(JSContextRef ctx)
147{
148 ExecState* exec = toJS(c: ctx);
149 return toRef(g: &exec->globalData());
150}
151
152JSGlobalContextRef JSContextGetGlobalContext(JSContextRef ctx)
153{
154 ExecState* exec = toJS(c: ctx);
155 APIEntryShim entryShim(exec);
156
157 return toGlobalRef(e: exec->lexicalGlobalObject()->globalExec());
158}
159

source code of qtscript/src/3rdparty/javascriptcore/JavaScriptCore/API/JSContextRef.cpp