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/*
* Copyright (C) 2006, 2007 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "JSContextRef.h"
#include "JSContextRefPrivate.h"
#include "APICast.h"
#include "InitializeThreading.h"
#include "JSCallbackObject.h"
#include "JSClassRef.h"
#include "JSGlobalObject.h"
#include "JSObject.h"
#include <wtf/text/StringHash.h>
#if OS(DARWIN)
#include <mach-o/dyld.h>
static const int32_t webkitFirstVersionWithConcurrentGlobalContexts = 0x2100500; // 528.5.0
#endif
using namespace JSC;
JSContextGroupRef JSContextGroupCreate()
{
initializeThreading();
return toRef(JSGlobalData::createContextGroup(ThreadStackTypeSmall).leakRef());
}
JSContextGroupRef JSContextGroupRetain(JSContextGroupRef group)
{
toJS(group)->ref();
return group;
}
void JSContextGroupRelease(JSContextGroupRef group)
{
toJS(group)->deref();
}
JSGlobalContextRef JSGlobalContextCreate(JSClassRef globalObjectClass)
{
initializeThreading();
#if OS(DARWIN)
// When running on Tiger or Leopard, or if the application was linked before JSGlobalContextCreate was changed
// to use a unique JSGlobalData, we use a shared one for compatibility.
#ifndef BUILDING_ON_LEOPARD
if (NSVersionOfLinkTimeLibrary("JavaScriptCore") <= webkitFirstVersionWithConcurrentGlobalContexts) {
#else
{
#endif
JSLock lock(LockForReal);
return JSGlobalContextCreateInGroup(toRef(&JSGlobalData::sharedInstance()), globalObjectClass);
}
#endif // OS(DARWIN)
return JSGlobalContextCreateInGroup(0, globalObjectClass);
}
JSGlobalContextRef JSGlobalContextCreateInGroup(JSContextGroupRef group, JSClassRef globalObjectClass)
{
initializeThreading();
JSLock lock(LockForReal);
RefPtr<JSGlobalData> globalData = group ? PassRefPtr<JSGlobalData>(toJS(group)) : JSGlobalData::createContextGroup(ThreadStackTypeSmall);
APIEntryShim entryShim(globalData.get(), false);
#if ENABLE(JSC_MULTIPLE_THREADS)
globalData->makeUsableFromMultipleThreads();
#endif
if (!globalObjectClass) {
JSGlobalObject* globalObject = new (globalData.get()) JSGlobalObject(*globalData, JSGlobalObject::createStructure(*globalData, jsNull()));
return JSGlobalContextRetain(toGlobalRef(globalObject->globalExec()));
}
JSGlobalObject* globalObject = new (globalData.get()) JSCallbackObject<JSGlobalObject>(*globalData, globalObjectClass, JSCallbackObject<JSGlobalObject>::createStructure(*globalData, jsNull()));
ExecState* exec = globalObject->globalExec();
JSValue prototype = globalObjectClass->prototype(exec);
if (!prototype)
prototype = jsNull();
globalObject->resetPrototype(*globalData, prototype);
return JSGlobalContextRetain(toGlobalRef(exec));
}
JSGlobalContextRef JSGlobalContextRetain(JSGlobalContextRef ctx)
{
ExecState* exec = toJS(ctx);
APIEntryShim entryShim(exec);
JSGlobalData& globalData = exec->globalData();
gcProtect(exec->dynamicGlobalObject());
globalData.ref();
return ctx;
}
void JSGlobalContextRelease(JSGlobalContextRef ctx)
{
ExecState* exec = toJS(ctx);
JSLock lock(exec);
JSGlobalData& globalData = exec->globalData();
JSGlobalObject* dgo = exec->dynamicGlobalObject();
IdentifierTable* savedIdentifierTable = wtfThreadData().setCurrentIdentifierTable(globalData.identifierTable);
// One reference is held by JSGlobalObject, another added by JSGlobalContextRetain().
bool releasingContextGroup = globalData.refCount() == 2;
bool releasingGlobalObject = Heap::heap(dgo)->unprotect(dgo);
// If this is the last reference to a global data, it should also
// be the only remaining reference to the global object too!
ASSERT(!releasingContextGroup || releasingGlobalObject);
// An API 'JSGlobalContextRef' retains two things - a global object and a
// global data (or context group, in API terminology).
// * If this is the last reference to any contexts in the given context group,
// call destroy on the heap (the global data is being freed).
// * If this was the last reference to the global object, then unprotecting
// it may release a lot of GC memory - tickle the activity callback to
// garbage collect soon.
// * If there are more references remaining the the global object, then do nothing
// (specifically that is more protects, which we assume come from other JSGlobalContextRefs).
if (releasingContextGroup) {
globalData.clearBuiltinStructures();
globalData.heap.destroy();
} else if (releasingGlobalObject) {
globalData.heap.activityCallback()->synchronize();
(*globalData.heap.activityCallback())();
}
globalData.deref();
wtfThreadData().setCurrentIdentifierTable(savedIdentifierTable);
}
JSObjectRef JSContextGetGlobalObject(JSContextRef ctx)
{
ExecState* exec = toJS(ctx);
APIEntryShim entryShim(exec);
// It is necessary to call toThisObject to get the wrapper object when used with WebCore.
return toRef(exec->lexicalGlobalObject()->toThisObject(exec));
}
JSContextGroupRef JSContextGetGroup(JSContextRef ctx)
{
ExecState* exec = toJS(ctx);
return toRef(&exec->globalData());
}
JSGlobalContextRef JSContextGetGlobalContext(JSContextRef ctx)
{
ExecState* exec = toJS(ctx);
APIEntryShim entryShim(exec);
return toGlobalRef(exec->lexicalGlobalObject()->globalExec());
}
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