зеркало из https://github.com/mozilla/pjs.git
353 строки
11 KiB
C++
353 строки
11 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* ActiveState Tool Corp..
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* Portions created by the Initial Developer are Copyright (C) 2001
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Mark Hammond <MarkH@ActiveState.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "nsISupports.h"
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#include "nsExceptionService.h"
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#include "nsIServiceManager.h"
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#include "nsCOMPtr.h"
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#include "prthread.h"
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#include "mozilla/Services.h"
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using namespace mozilla;
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static const PRUintn BAD_TLS_INDEX = (PRUintn) -1;
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#define CHECK_SERVICE_USE_OK() if (!sLock) return NS_ERROR_NOT_INITIALIZED
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#define CHECK_MANAGER_USE_OK() if (!mService || !nsExceptionService::sLock) return NS_ERROR_NOT_INITIALIZED
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// A key for our registered module providers hashtable
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class nsProviderKey : public nsHashKey {
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protected:
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PRUint32 mKey;
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public:
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nsProviderKey(PRUint32 key) : mKey(key) {}
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PRUint32 HashCode(void) const {
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return mKey;
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}
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PRBool Equals(const nsHashKey *aKey) const {
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return mKey == ((const nsProviderKey *) aKey)->mKey;
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}
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nsHashKey *Clone() const {
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return new nsProviderKey(mKey);
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}
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PRUint32 GetValue() { return mKey; }
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};
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/** Exception Manager definition **/
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class nsExceptionManager : public nsIExceptionManager
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{
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public:
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NS_DECL_ISUPPORTS
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NS_DECL_NSIEXCEPTIONMANAGER
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nsExceptionManager(nsExceptionService *svc);
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/* additional members */
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nsCOMPtr<nsIException> mCurrentException;
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nsExceptionManager *mNextThread; // not ref-counted.
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nsExceptionService *mService; // not ref-counted
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#ifdef NS_DEBUG
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static PRInt32 totalInstances;
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#endif
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private:
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~nsExceptionManager();
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};
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#ifdef NS_DEBUG
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PRInt32 nsExceptionManager::totalInstances = 0;
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#endif
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// Note this object is single threaded - the service itself ensures
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// one per thread.
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// An exception if the destructor, which may be called on
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// the thread shutting down xpcom
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NS_IMPL_THREADSAFE_ISUPPORTS1(nsExceptionManager, nsIExceptionManager)
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nsExceptionManager::nsExceptionManager(nsExceptionService *svc) :
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mNextThread(nsnull),
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mService(svc)
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{
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/* member initializers and constructor code */
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#ifdef NS_DEBUG
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PR_ATOMIC_INCREMENT(&totalInstances);
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#endif
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}
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nsExceptionManager::~nsExceptionManager()
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{
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/* destructor code */
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#ifdef NS_DEBUG
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PR_ATOMIC_DECREMENT(&totalInstances);
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#endif // NS_DEBUG
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}
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/* void setCurrentException (in nsIException error); */
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NS_IMETHODIMP nsExceptionManager::SetCurrentException(nsIException *error)
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{
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CHECK_MANAGER_USE_OK();
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mCurrentException = error;
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return NS_OK;
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}
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/* nsIException getCurrentException (); */
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NS_IMETHODIMP nsExceptionManager::GetCurrentException(nsIException **_retval)
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{
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CHECK_MANAGER_USE_OK();
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*_retval = mCurrentException;
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NS_IF_ADDREF(*_retval);
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return NS_OK;
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}
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/* nsIException getExceptionFromProvider( in nsresult rc, in nsIException defaultException); */
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NS_IMETHODIMP nsExceptionManager::GetExceptionFromProvider(nsresult rc, nsIException * defaultException, nsIException **_retval)
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{
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CHECK_MANAGER_USE_OK();
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// Just delegate back to the service with the provider map.
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return mService->GetExceptionFromProvider(rc, defaultException, _retval);
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}
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/* The Exception Service */
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PRUintn nsExceptionService::tlsIndex = BAD_TLS_INDEX;
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Mutex *nsExceptionService::sLock = nsnull;
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nsExceptionManager *nsExceptionService::firstThread = nsnull;
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#ifdef NS_DEBUG
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PRInt32 nsExceptionService::totalInstances = 0;
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#endif
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NS_IMPL_THREADSAFE_ISUPPORTS3(nsExceptionService,
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nsIExceptionService,
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nsIExceptionManager,
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nsIObserver)
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nsExceptionService::nsExceptionService()
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: mProviders(4, PR_TRUE) /* small, thread-safe hashtable */
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{
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#ifdef NS_DEBUG
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if (PR_ATOMIC_INCREMENT(&totalInstances)!=1) {
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NS_ERROR("The nsExceptionService is a singleton!");
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}
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#endif
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/* member initializers and constructor code */
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if (tlsIndex == BAD_TLS_INDEX) {
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PRStatus status;
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status = PR_NewThreadPrivateIndex( &tlsIndex, ThreadDestruct );
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NS_ASSERTION(status==0, "ScriptErrorService could not allocate TLS storage.");
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}
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sLock = new Mutex("nsExceptionService.sLock");
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// observe XPCOM shutdown.
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nsCOMPtr<nsIObserverService> observerService =
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mozilla::services::GetObserverService();
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NS_ASSERTION(observerService, "Could not get observer service!");
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if (observerService)
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observerService->AddObserver(this, NS_XPCOM_SHUTDOWN_OBSERVER_ID, PR_FALSE);
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}
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nsExceptionService::~nsExceptionService()
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{
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Shutdown();
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/* destructor code */
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#ifdef NS_DEBUG
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PR_ATOMIC_DECREMENT(&totalInstances);
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#endif
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}
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/*static*/
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void nsExceptionService::ThreadDestruct( void *data )
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{
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if (!sLock) {
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NS_WARNING("nsExceptionService ignoring thread destruction after shutdown");
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return;
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}
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DropThread( (nsExceptionManager *)data );
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}
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void nsExceptionService::Shutdown()
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{
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mProviders.Reset();
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if (sLock) {
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DropAllThreads();
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delete sLock;
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sLock = nsnull;
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}
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PR_SetThreadPrivate(tlsIndex, nsnull);
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}
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/* void setCurrentException (in nsIException error); */
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NS_IMETHODIMP nsExceptionService::SetCurrentException(nsIException *error)
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{
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CHECK_SERVICE_USE_OK();
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nsCOMPtr<nsIExceptionManager> sm;
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nsresult nr = GetCurrentExceptionManager(getter_AddRefs(sm));
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if (NS_FAILED(nr))
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return nr;
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return sm->SetCurrentException(error);
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}
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/* nsIException getCurrentException (); */
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NS_IMETHODIMP nsExceptionService::GetCurrentException(nsIException **_retval)
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{
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CHECK_SERVICE_USE_OK();
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nsCOMPtr<nsIExceptionManager> sm;
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nsresult nr = GetCurrentExceptionManager(getter_AddRefs(sm));
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if (NS_FAILED(nr))
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return nr;
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return sm->GetCurrentException(_retval);
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}
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/* nsIException getExceptionFromProvider( in nsresult rc, in nsIException defaultException); */
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NS_IMETHODIMP nsExceptionService::GetExceptionFromProvider(nsresult rc,
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nsIException * defaultException, nsIException **_retval)
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{
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CHECK_SERVICE_USE_OK();
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return DoGetExceptionFromProvider(rc, defaultException, _retval);
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}
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/* readonly attribute nsIExceptionManager currentExceptionManager; */
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NS_IMETHODIMP nsExceptionService::GetCurrentExceptionManager(nsIExceptionManager * *aCurrentScriptManager)
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{
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CHECK_SERVICE_USE_OK();
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nsExceptionManager *mgr = (nsExceptionManager *)PR_GetThreadPrivate(tlsIndex);
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if (mgr == nsnull) {
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// Stick the new exception object in with no reference count.
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mgr = new nsExceptionManager(this);
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PR_SetThreadPrivate(tlsIndex, mgr);
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// The reference count is held in the thread-list
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AddThread(mgr);
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}
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*aCurrentScriptManager = mgr;
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NS_ADDREF(*aCurrentScriptManager);
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return NS_OK;
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}
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/* void registerErrorProvider (in nsIExceptionProvider provider, in PRUint32 moduleCode); */
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NS_IMETHODIMP nsExceptionService::RegisterExceptionProvider(nsIExceptionProvider *provider, PRUint32 errorModule)
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{
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CHECK_SERVICE_USE_OK();
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nsProviderKey key(errorModule);
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if (mProviders.Put(&key, provider)) {
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NS_WARNING("Registration of exception provider overwrote another provider with the same module code!");
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}
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return NS_OK;
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}
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/* void unregisterErrorProvider (in nsIExceptionProvider provider, in PRUint32 errorModule); */
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NS_IMETHODIMP nsExceptionService::UnregisterExceptionProvider(nsIExceptionProvider *provider, PRUint32 errorModule)
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{
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CHECK_SERVICE_USE_OK();
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nsProviderKey key(errorModule);
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if (!mProviders.Remove(&key)) {
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NS_WARNING("Attempt to unregister an unregistered exception provider!");
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return NS_ERROR_UNEXPECTED;
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}
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return NS_OK;
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}
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// nsIObserver
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NS_IMETHODIMP nsExceptionService::Observe(nsISupports *aSubject, const char *aTopic, const PRUnichar *someData)
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{
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Shutdown();
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return NS_OK;
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}
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nsresult
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nsExceptionService::DoGetExceptionFromProvider(nsresult errCode,
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nsIException * defaultException,
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nsIException **_exc)
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{
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// Check for an existing exception
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nsresult nr = GetCurrentException(_exc);
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if (NS_SUCCEEDED(nr) && *_exc) {
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(*_exc)->GetResult(&nr);
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// If it matches our result then use it
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if (nr == errCode)
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return NS_OK;
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NS_RELEASE(*_exc);
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}
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nsProviderKey key(NS_ERROR_GET_MODULE(errCode));
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nsCOMPtr<nsIExceptionProvider> provider =
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dont_AddRef((nsIExceptionProvider *)mProviders.Get(&key));
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// No provider so we'll return the default exception
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if (!provider) {
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*_exc = defaultException;
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NS_IF_ADDREF(*_exc);
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return NS_OK;
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}
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return provider->GetException(errCode, defaultException, _exc);
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}
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// thread management
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/*static*/ void nsExceptionService::AddThread(nsExceptionManager *thread)
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{
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MutexAutoLock lock(*sLock);
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thread->mNextThread = firstThread;
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firstThread = thread;
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NS_ADDREF(thread);
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}
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/*static*/ void nsExceptionService::DoDropThread(nsExceptionManager *thread)
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{
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nsExceptionManager **emp = &firstThread;
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while (*emp != thread) {
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NS_ABORT_IF_FALSE(*emp, "Could not find the thread to drop!");
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emp = &(*emp)->mNextThread;
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}
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*emp = thread->mNextThread;
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NS_RELEASE(thread);
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}
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/*static*/ void nsExceptionService::DropThread(nsExceptionManager *thread)
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{
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MutexAutoLock lock(*sLock);
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DoDropThread(thread);
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}
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/*static*/ void nsExceptionService::DropAllThreads()
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{
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MutexAutoLock lock(*sLock);
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while (firstThread)
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DoDropThread(firstThread);
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}
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