trackingallocator.h   [plain text]

/*
 * Copyright (c) 2000-2001 Apple Computer, Inc. All Rights Reserved.
 * 
 * The contents of this file constitute Original Code as defined in and are
 * subject to the Apple Public Source License Version 1.2 (the 'License').
 * You may not use this file except in compliance with the License. Please obtain
 * a copy of the License at http://www.apple.com/publicsource and read it before
 * using this file.
 * 
 * This Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS
 * OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, INCLUDING WITHOUT
 * LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
 * PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. Please see the License for the
 * specific language governing rights and limitations under the License.
 */


//
// trackingallocator - CssmAllocator that keeps track of allocations
//
#ifndef _H_TRACKINGALLOCATOR
#define _H_TRACKINGALLOCATOR

#include <Security/cssmalloc.h>
#include <set>

namespace Security
{

//
// A CssmAllocator that keeps track of allocations and can throw everything
// away unless explicitly committed.
//
class TrackingAllocator : public CssmAllocator
{
public:
	TrackingAllocator(CssmAllocator &inAllocator) : mAllocator(inAllocator) {}
	virtual ~TrackingAllocator();

	void *malloc(size_t inSize) throw(std::bad_alloc)
	{
		void *anAddress = mAllocator.malloc(inSize);
		mAllocSet.insert(anAddress);
		return anAddress;
	}

	void free(void *inAddress) throw()
	{
		mAllocator.free(inAddress);
		mAllocSet.erase(inAddress);
	}

	void *realloc(void *inAddress, size_t inNewSize) throw(std::bad_alloc)
	{
		void *anAddress = mAllocator.realloc(inAddress, inNewSize);
		if (anAddress != inAddress)
		{
			mAllocSet.erase(inAddress);
			mAllocSet.insert(anAddress);
		}

		return anAddress;
	}

	void commit() { mAllocSet.clear(); }
private:
	typedef std::set<void *> AllocSet;

	CssmAllocator &mAllocator;
	AllocSet mAllocSet;
};

} // end namespace Security

#endif //_H_TRACKINGALLOCATOR