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27 #include "JSContextRef.h"
28 #include "JSContextRefPrivate.h"
31 #include "InitializeThreading.h"
32 #include "JSCallbackObject.h"
33 #include "JSClassRef.h"
34 #include "JSGlobalObject.h"
36 #include <wtf/text/StringHash.h>
39 #include <mach-o/dyld.h>
41 static const int32_t webkitFirstVersionWithConcurrentGlobalContexts = 0x2100500; // 528.5.0
46 JSContextGroupRef JSContextGroupCreate()
48 initializeThreading();
49 return toRef(JSGlobalData::createContextGroup(ThreadStackTypeSmall).releaseRef());
52 JSContextGroupRef JSContextGroupRetain(JSContextGroupRef group)
58 void JSContextGroupRelease(JSContextGroupRef group)
63 JSGlobalContextRef JSGlobalContextCreate(JSClassRef globalObjectClass)
65 initializeThreading();
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) {
74 JSLock lock(LockForReal);
75 return JSGlobalContextCreateInGroup(toRef(&JSGlobalData::sharedInstance()), globalObjectClass);
79 return JSGlobalContextCreateInGroup(0, globalObjectClass);
82 JSGlobalContextRef JSGlobalContextCreateInGroup(JSContextGroupRef group, JSClassRef globalObjectClass)
84 initializeThreading();
86 JSLock lock(LockForReal);
87 RefPtr<JSGlobalData> globalData = group ? PassRefPtr<JSGlobalData>(toJS(group)) : JSGlobalData::createContextGroup(ThreadStackTypeSmall);
89 APIEntryShim entryShim(globalData.get(), false);
91 #if ENABLE(JSC_MULTIPLE_THREADS)
92 globalData->makeUsableFromMultipleThreads();
95 if (!globalObjectClass) {
96 JSGlobalObject* globalObject = new (globalData.get()) JSGlobalObject;
97 return JSGlobalContextRetain(toGlobalRef(globalObject->globalExec()));
100 JSGlobalObject* globalObject = new (globalData.get()) JSCallbackObject<JSGlobalObject>(globalObjectClass, JSCallbackObject<JSGlobalObject>::createStructure(jsNull()));
101 ExecState* exec = globalObject->globalExec();
102 JSValue prototype = globalObjectClass->prototype(exec);
104 prototype = jsNull();
105 globalObject->resetPrototype(prototype);
106 return JSGlobalContextRetain(toGlobalRef(exec));
109 JSGlobalContextRef JSGlobalContextRetain(JSGlobalContextRef ctx)
111 ExecState* exec = toJS(ctx);
112 APIEntryShim entryShim(exec);
114 JSGlobalData& globalData = exec->globalData();
115 gcProtect(exec->dynamicGlobalObject());
120 void JSGlobalContextRelease(JSGlobalContextRef ctx)
122 ExecState* exec = toJS(ctx);
125 JSGlobalData& globalData = exec->globalData();
126 JSGlobalObject* dgo = exec->dynamicGlobalObject();
127 IdentifierTable* savedIdentifierTable = wtfThreadData().setCurrentIdentifierTable(globalData.identifierTable);
129 // One reference is held by JSGlobalObject, another added by JSGlobalContextRetain().
130 bool releasingContextGroup = globalData.refCount() == 2;
131 bool releasingGlobalObject = Heap::heap(dgo)->unprotect(dgo);
132 // If this is the last reference to a global data, it should also
133 // be the only remaining reference to the global object too!
134 ASSERT(!releasingContextGroup || releasingGlobalObject);
136 // An API 'JSGlobalContextRef' retains two things - a global object and a
137 // global data (or context group, in API terminology).
138 // * If this is the last reference to any contexts in the given context group,
139 // call destroy on the heap (the global data is being freed).
140 // * If this was the last reference to the global object, then unprotecting
141 // it may release a lot of GC memory - run the garbage collector now.
142 // * If there are more references remaining the the global object, then do nothing
143 // (specifically that is more protects, which we assume come from other JSGlobalContextRefs).
144 if (releasingContextGroup)
145 globalData.heap.destroy();
146 else if (releasingGlobalObject)
147 globalData.heap.collectAllGarbage();
151 wtfThreadData().setCurrentIdentifierTable(savedIdentifierTable);
154 JSObjectRef JSContextGetGlobalObject(JSContextRef ctx)
156 ExecState* exec = toJS(ctx);
157 APIEntryShim entryShim(exec);
159 // It is necessary to call toThisObject to get the wrapper object when used with WebCore.
160 return toRef(exec->lexicalGlobalObject()->toThisObject(exec));
163 JSContextGroupRef JSContextGetGroup(JSContextRef ctx)
165 ExecState* exec = toJS(ctx);
166 return toRef(&exec->globalData());
169 JSGlobalContextRef JSContextGetGlobalContext(JSContextRef ctx)
171 ExecState* exec = toJS(ctx);
172 APIEntryShim entryShim(exec);
174 return toGlobalRef(exec->lexicalGlobalObject()->globalExec());