gecko-dev/xpcom/ds/nsSizeOfHandler.cpp
1999-05-26 01:38:36 +00:00

122 lines
2.9 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Netscape Public License
* Version 1.0 (the "NPL"); you may not use this file except in
* compliance with the NPL. You may obtain a copy of the NPL at
* http://www.mozilla.org/NPL/
*
* Software distributed under the NPL is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
* for the specific language governing rights and limitations under the
* NPL.
*
* The Initial Developer of this code under the NPL is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
* Reserved.
*/
#include "nsISizeOfHandler.h"
#include "plhash.h"
static NS_DEFINE_IID(kISizeOfHandlerIID, NS_ISIZEOF_HANDLER_IID);
class nsSizeOfHandler : public nsISizeOfHandler {
public:
nsSizeOfHandler();
virtual ~nsSizeOfHandler();
// nsISupports
NS_DECL_ISUPPORTS
// nsISizeOfHandler
NS_IMETHOD Add(size_t aSize);
virtual PRBool HaveSeen(void* anObject);
NS_IMETHOD GetSize(PRUint32& aResult);
protected:
PRUint32 mTotalSize;
PLHashTable* mTable;
};
static PLHashNumber
HashKey(void* key)
{
return (PLHashNumber) key;
}
static PRIntn
CompareKeys(void* key1, void* key2)
{
return key1 == key2;
}
nsSizeOfHandler::nsSizeOfHandler()
{
NS_INIT_REFCNT();
mTotalSize = 0;
mTable = PL_NewHashTable(8, (PLHashFunction) HashKey,
(PLHashComparator) CompareKeys,
(PLHashComparator) nsnull,
nsnull, nsnull);
}
nsSizeOfHandler::~nsSizeOfHandler()
{
if (nsnull != mTable) {
PL_HashTableDestroy(mTable);
}
}
NS_IMPL_ISUPPORTS(nsSizeOfHandler, kISizeOfHandlerIID)
NS_IMETHODIMP
nsSizeOfHandler::Add(size_t aSize)
{
mTotalSize += aSize;
return NS_OK;
}
PRBool
nsSizeOfHandler::HaveSeen(void* anObject)
{
if (nsnull == mTable) {
// When we run out of memory, HaveSeen returns PR_TRUE to stop
// wasting time.
return PR_TRUE;
}
if (nsnull != anObject) {
PRInt32 hashCode = (PRInt32) anObject;
PLHashEntry** hep = PL_HashTableRawLookup(mTable, hashCode, anObject);
PLHashEntry* he = *hep;
if (nsnull != he) {
return PR_TRUE;
}
he = PL_HashTableRawAdd(mTable, hep, hashCode, anObject, anObject);
if (nsnull == he) {
// When we run out of memory, HaveSeen returns PR_TRUE to stop
// wasting time.
return PR_TRUE;
}
return PR_FALSE;
}
return PR_TRUE;
}
NS_IMETHODIMP
nsSizeOfHandler::GetSize(PRUint32& aResult)
{
aResult = mTotalSize;
return NS_OK;
}
NS_COM nsresult
NS_NewSizeOfHandler(nsISizeOfHandler** aInstancePtrResult)
{
nsISizeOfHandler *it = new nsSizeOfHandler();
if (it == nsnull) {
return NS_ERROR_OUT_OF_MEMORY;
}
return it->QueryInterface(kISizeOfHandlerIID, (void **) aInstancePtrResult);
}