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 41 static const int32_t webkitFirstVersionWithConcurrentGlobalContexts = 0x2100500; // 528.5.0 42 #endif 43 44 using namespace JSC; 45 46 JSContextGroupRef JSContextGroupCreate() 47 { 48 initializeThreading(); 49 return toRef(JSGlobalData::createNonDefault().releaseRef()); 50 } 51 52 JSContextGroupRef JSContextGroupRetain(JSContextGroupRef group) 53 { 54 toJS(group)->ref(); 55 return group; 56 } 57 58 void JSContextGroupRelease(JSContextGroupRef group) 59 { 60 toJS(group)->deref(); 61 } 62 63 JSGlobalContextRef 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(0, globalObjectClass); 80 } 81 82 JSGlobalContextRef JSGlobalContextCreateInGroup(JSContextGroupRef group, JSClassRef globalObjectClass) 83 { 84 initializeThreading(); 85 86 JSLock lock(LockForReal); 87 RefPtr<JSGlobalData> globalData = group ? PassRefPtr<JSGlobalData>(toJS(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(toGlobalRef(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(toGlobalRef(exec)); 107 } 108 109 JSGlobalContextRef JSGlobalContextRetain(JSGlobalContextRef ctx) 110 { 111 ExecState* exec = toJS(ctx); 112 APIEntryShim entryShim(exec); 113 114 JSGlobalData& globalData = exec->globalData(); 115 gcProtect(exec->dynamicGlobalObject()); 116 globalData.ref(); 117 return ctx; 118 } 119 120 void JSGlobalContextRelease(JSGlobalContextRef ctx) 121 { 122 ExecState* exec = toJS(ctx); 123 APIEntryShim entryShim(exec, false); 124 125 gcUnprotect(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 } 136 137 JSObjectRef JSContextGetGlobalObject(JSContextRef ctx) 138 { 139 ExecState* exec = toJS(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(exec->lexicalGlobalObject()->toThisObject(exec)); 144 } 145 146 JSContextGroupRef JSContextGetGroup(JSContextRef ctx) 147 { 148 ExecState* exec = toJS(ctx); 149 return toRef(&exec->globalData()); 150 } 151 152 JSGlobalContextRef JSContextGetGlobalContext(JSContextRef ctx) 153 { 154 ExecState* exec = toJS(ctx); 155 APIEntryShim entryShim(exec); 156 157 return toGlobalRef(exec->lexicalGlobalObject()->globalExec()); 158 } 159