LCOV - code coverage report
Current view: directory - xpcom/base - nsMemoryImpl.cpp (source / functions) Found Hit Coverage
Test: app.info Lines: 67 20 29.9 %
Date: 2012-06-02 Functions: 20 10 50.0 %

       1                 : /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
       2                 : /* ***** BEGIN LICENSE BLOCK *****
       3                 :  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
       4                 :  *
       5                 :  * The contents of this file are subject to the Mozilla Public License Version
       6                 :  * 1.1 (the "License"); you may not use this file except in compliance with
       7                 :  * the License. You may obtain a copy of the License at
       8                 :  * http://www.mozilla.org/MPL/
       9                 :  *
      10                 :  * Software distributed under the License is distributed on an "AS IS" basis,
      11                 :  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
      12                 :  * for the specific language governing rights and limitations under the
      13                 :  * License.
      14                 :  *
      15                 :  * The Original Code is mozilla.org code.
      16                 :  *
      17                 :  * The Initial Developer of the Original Code is
      18                 :  * Netscape Communications Corporation.
      19                 :  * Portions created by the Initial Developer are Copyright (C) 1998
      20                 :  * the Initial Developer. All Rights Reserved.
      21                 :  *
      22                 :  * Contributor(s):
      23                 :  *
      24                 :  * Alternatively, the contents of this file may be used under the terms of
      25                 :  * either of the GNU General Public License Version 2 or later (the "GPL"),
      26                 :  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
      27                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
      28                 :  * of those above. If you wish to allow use of your version of this file only
      29                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
      30                 :  * use your version of this file under the terms of the MPL, indicate your
      31                 :  * decision by deleting the provisions above and replace them with the notice
      32                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
      33                 :  * the provisions above, a recipient may use your version of this file under
      34                 :  * the terms of any one of the MPL, the GPL or the LGPL.
      35                 :  *
      36                 :  * ***** END LICENSE BLOCK ***** */
      37                 : 
      38                 : #include "nsXPCOM.h"
      39                 : #include "nsMemoryImpl.h"
      40                 : #include "nsThreadUtils.h"
      41                 : 
      42                 : #include "nsIObserver.h"
      43                 : #include "nsIObserverService.h"
      44                 : #include "nsIServiceManager.h"
      45                 : #include "nsISupportsArray.h"
      46                 : 
      47                 : #include "prmem.h"
      48                 : #include "prcvar.h"
      49                 : #include "pratom.h"
      50                 : 
      51                 : #include "nsAlgorithm.h"
      52                 : #include "nsCOMPtr.h"
      53                 : #include "nsString.h"
      54                 : #include "mozilla/Services.h"
      55                 : 
      56            1464 : static nsMemoryImpl sGlobalMemory;
      57                 : 
      58           26450 : NS_IMPL_QUERY_INTERFACE1(nsMemoryImpl, nsIMemory)
      59                 : 
      60                 : NS_IMETHODIMP_(void*)
      61         3682988 : nsMemoryImpl::Alloc(PRSize size)
      62                 : {
      63         3682988 :     return NS_Alloc(size);
      64                 : }
      65                 : 
      66                 : NS_IMETHODIMP_(void*)
      67            8121 : nsMemoryImpl::Realloc(void* ptr, PRSize size)
      68                 : {
      69            8121 :     return NS_Realloc(ptr, size);
      70                 : }
      71                 : 
      72                 : NS_IMETHODIMP_(void)
      73         3682986 : nsMemoryImpl::Free(void* ptr)
      74                 : {
      75         3682986 :     NS_Free(ptr);
      76         3682986 : }
      77                 : 
      78                 : NS_IMETHODIMP
      79               0 : nsMemoryImpl::HeapMinimize(bool aImmediate)
      80                 : {
      81               0 :     return FlushMemory(NS_LITERAL_STRING("heap-minimize").get(), aImmediate);
      82                 : }
      83                 : 
      84                 : NS_IMETHODIMP
      85               0 : nsMemoryImpl::IsLowMemory(bool *result)
      86                 : {
      87               0 :     NS_ERROR("IsLowMemory is deprecated.  See bug 592308.");
      88               0 :     *result = false;
      89               0 :     return NS_OK;
      90                 : }
      91                 : 
      92                 : /*static*/ nsresult
      93               0 : nsMemoryImpl::Create(nsISupports* outer, const nsIID& aIID, void **aResult)
      94                 : {
      95               0 :     NS_ENSURE_NO_AGGREGATION(outer);
      96               0 :     return sGlobalMemory.QueryInterface(aIID, aResult);
      97                 : }
      98                 : 
      99                 : nsresult
     100               0 : nsMemoryImpl::FlushMemory(const PRUnichar* aReason, bool aImmediate)
     101                 : {
     102               0 :     nsresult rv = NS_OK;
     103                 : 
     104               0 :     if (aImmediate) {
     105                 :         // They've asked us to run the flusher *immediately*. We've
     106                 :         // got to be on the UI main thread for us to be able to do
     107                 :         // that...are we?
     108               0 :         if (!NS_IsMainThread()) {
     109               0 :             NS_ERROR("can't synchronously flush memory: not on UI thread");
     110               0 :             return NS_ERROR_FAILURE;
     111                 :         }
     112                 :     }
     113                 : 
     114               0 :     PRInt32 lastVal = PR_ATOMIC_SET(&sIsFlushing, 1);
     115               0 :     if (lastVal)
     116               0 :         return NS_OK;
     117                 : 
     118               0 :     PRIntervalTime now = PR_IntervalNow();
     119                 : 
     120                 :     // Run the flushers immediately if we can; otherwise, proxy to the
     121                 :     // UI thread an run 'em asynchronously.
     122               0 :     if (aImmediate) {
     123               0 :         rv = RunFlushers(aReason);
     124                 :     }
     125                 :     else {
     126                 :         // Don't broadcast more than once every 1000ms to avoid being noisy
     127               0 :         if (PR_IntervalToMicroseconds(now - sLastFlushTime) > 1000) {
     128               0 :             sFlushEvent.mReason = aReason;
     129               0 :             rv = NS_DispatchToMainThread(&sFlushEvent, NS_DISPATCH_NORMAL);
     130                 :         }
     131                 :     }
     132                 : 
     133               0 :     sLastFlushTime = now;
     134               0 :     return rv;
     135                 : }
     136                 : 
     137                 : nsresult
     138               0 : nsMemoryImpl::RunFlushers(const PRUnichar* aReason)
     139                 : {
     140               0 :     nsCOMPtr<nsIObserverService> os = mozilla::services::GetObserverService();
     141               0 :     if (os) {
     142                 : 
     143                 :         // Instead of:
     144                 :         //  os->NotifyObservers(this, "memory-pressure", aReason);
     145                 :         // we are going to do this manually to see who/what is
     146                 :         // deallocating.
     147                 : 
     148               0 :         nsCOMPtr<nsISimpleEnumerator> e;
     149               0 :         os->EnumerateObservers("memory-pressure", getter_AddRefs(e));
     150                 : 
     151               0 :         if ( e ) {
     152               0 :           nsCOMPtr<nsIObserver> observer;
     153               0 :           bool loop = true;
     154                 : 
     155               0 :           while (NS_SUCCEEDED(e->HasMoreElements(&loop)) && loop) 
     156                 :           {
     157               0 :               e->GetNext(getter_AddRefs(observer));
     158                 : 
     159               0 :               if (!observer)
     160               0 :                   continue;
     161                 : 
     162               0 :               observer->Observe(observer, "memory-pressure", aReason);
     163                 :           }
     164                 :         }
     165                 :     }
     166                 : 
     167               0 :     sIsFlushing = 0;
     168               0 :     return NS_OK;
     169                 : }
     170                 : 
     171                 : // XXX need NS_IMPL_STATIC_ADDREF/RELEASE
     172               0 : NS_IMETHODIMP_(nsrefcnt) nsMemoryImpl::FlushEvent::AddRef() { return 2; }
     173               0 : NS_IMETHODIMP_(nsrefcnt) nsMemoryImpl::FlushEvent::Release() { return 1; }
     174               0 : NS_IMPL_QUERY_INTERFACE1(nsMemoryImpl::FlushEvent, nsIRunnable)
     175                 : 
     176                 : NS_IMETHODIMP
     177               0 : nsMemoryImpl::FlushEvent::Run()
     178                 : {
     179               0 :     sGlobalMemory.RunFlushers(mReason);
     180               0 :     return NS_OK;
     181                 : }
     182                 : 
     183                 : PRInt32
     184                 : nsMemoryImpl::sIsFlushing = 0;
     185                 : 
     186                 : PRIntervalTime
     187                 : nsMemoryImpl::sLastFlushTime = 0;
     188                 : 
     189                 : nsMemoryImpl::FlushEvent
     190            1464 : nsMemoryImpl::sFlushEvent;
     191                 : 
     192                 : XPCOM_API(void*)
     193         9415818 : NS_Alloc(PRSize size)
     194                 : {
     195         9415818 :     return moz_xmalloc(size);
     196                 : }
     197                 : 
     198                 : XPCOM_API(void*)
     199           32538 : NS_Realloc(void* ptr, PRSize size)
     200                 : {
     201           32538 :     return moz_xrealloc(ptr, size);
     202                 : }
     203                 : 
     204                 : XPCOM_API(void)
     205         9853108 : NS_Free(void* ptr)
     206                 : {
     207         9853108 :     moz_free(ptr);
     208         9853108 : }
     209                 : 
     210                 : nsresult
     211           26450 : NS_GetMemoryManager(nsIMemory* *result)
     212                 : {
     213           26450 :     return sGlobalMemory.QueryInterface(NS_GET_IID(nsIMemory), (void**) result);
     214            4392 : }

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