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