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lightning-sunbird  0.9+nobinonly
nsXBLProtoImplMember.cpp
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00001 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
00002 /* ***** BEGIN LICENSE BLOCK *****
00003  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
00004  *
00005  * The contents of this file are subject to the Mozilla Public License Version
00006  * 1.1 (the "License"); you may not use this file except in compliance with
00007  * the License. You may obtain a copy of the License at
00008  * http://www.mozilla.org/MPL/
00009  *
00010  * Software distributed under the License is distributed on an "AS IS" basis,
00011  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
00012  * for the specific language governing rights and limitations under the
00013  * License.
00014  *
00015  * The Original Code is Mozilla Communicator client code.
00016  *
00017  * The Initial Developer of the Original Code is
00018  * Netscape Communications Corporation.
00019  * Portions created by the Initial Developer are Copyright (C) 1998
00020  * the Initial Developer. All Rights Reserved.
00021  *
00022  * Contributor(s):
00023  *   David Hyatt <hyatt@netscape.com> (Original Author)
00024  *
00025  * Alternatively, the contents of this file may be used under the terms of
00026  * either of the GNU General Public License Version 2 or later (the "GPL"),
00027  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
00028  * in which case the provisions of the GPL or the LGPL are applicable instead
00029  * of those above. If you wish to allow use of your version of this file only
00030  * under the terms of either the GPL or the LGPL, and not to allow others to
00031  * use your version of this file under the terms of the MPL, indicate your
00032  * decision by deleting the provisions above and replace them with the notice
00033  * and other provisions required by the GPL or the LGPL. If you do not delete
00034  * the provisions above, a recipient may use your version of this file under
00035  * the terms of any one of the MPL, the GPL or the LGPL.
00036  *
00037  * ***** END LICENSE BLOCK ***** */
00038 
00039 #include "nsXBLProtoImplMember.h"
00040 #include "jsapi.h"
00041 
00042 // statics get inited to 0 by default
00043 /* static */
00044 nsIJSRuntimeService* nsXBLProtoImplMember::gJSRuntimeService;
00045 /* static */
00046 JSRuntime* nsXBLProtoImplMember::gScriptRuntime;
00047 /* static */
00048 PRInt32 nsXBLProtoImplMember::gScriptRuntimeRefcnt;
00049 
00050 /* static */
00051 nsresult
00052 nsXBLProtoImplMember::AddJSGCRoot(void* aScriptObjectRef, const char* aName)
00053 {
00054   if (++gScriptRuntimeRefcnt == 1 || !gScriptRuntime) {
00055     CallGetService("@mozilla.org/js/xpc/RuntimeService;1",
00056                    &gJSRuntimeService);
00057     if (! gJSRuntimeService) {
00058       NS_NOTREACHED("couldn't add GC root");
00059       return NS_ERROR_FAILURE;
00060     }
00061 
00062     gJSRuntimeService->GetRuntime(&gScriptRuntime);
00063     if (! gScriptRuntime) {
00064       NS_NOTREACHED("couldn't add GC root");
00065       return NS_ERROR_FAILURE;
00066     }
00067   }
00068 
00069   PRBool ok;
00070   ok = ::JS_AddNamedRootRT(gScriptRuntime, aScriptObjectRef, aName);
00071   if (! ok) {
00072     NS_NOTREACHED("couldn't add GC root");
00073     return NS_ERROR_OUT_OF_MEMORY;
00074   }
00075 
00076   return NS_OK;
00077 }
00078 
00079 /* static */
00080 nsresult
00081 nsXBLProtoImplMember::RemoveJSGCRoot(void* aScriptObjectRef)
00082 {
00083   if (!gScriptRuntime) {
00084     NS_NOTREACHED("couldn't remove GC root");
00085     return NS_ERROR_FAILURE;
00086   }
00087 
00088   ::JS_RemoveRootRT(gScriptRuntime, aScriptObjectRef);
00089 
00090   if (--gScriptRuntimeRefcnt == 0) {
00091     NS_RELEASE(gJSRuntimeService);
00092     gScriptRuntime = nsnull;
00093   }
00094 
00095   return NS_OK;
00096 }