gecko-dev/xpcom/ds/nsArena.cpp

98 lines
2.3 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 "nsArena.h"
#include "nsCRT.h"
ArenaImpl::ArenaImpl(void)
: mInitialized(PR_FALSE)
{
NS_INIT_REFCNT();
nsCRT::memset(&mPool, 0, sizeof(PLArenaPool));
}
NS_IMETHODIMP
ArenaImpl::Init(PRUint32 aBlockSize)
{
if (aBlockSize < NS_MIN_ARENA_BLOCK_SIZE) {
aBlockSize = NS_DEFAULT_ARENA_BLOCK_SIZE;
}
PL_INIT_ARENA_POOL(&mPool, "nsIArena", aBlockSize);
mBlockSize = aBlockSize;
mInitialized = PR_TRUE;
return NS_OK;
}
NS_IMPL_ISUPPORTS1(ArenaImpl, nsIArena)
ArenaImpl::~ArenaImpl()
{
if (mInitialized)
PL_FinishArenaPool(&mPool);
mInitialized = PR_FALSE;
}
NS_IMETHODIMP_(void*)
ArenaImpl::Alloc(PRUint32 size)
{
// Adjust size so that it's a multiple of sizeof(double)
PRUint32 align = size & (sizeof(double) - 1);
if (0 != align) {
size += sizeof(double) - align;
}
void* p;
PL_ARENA_ALLOCATE(p, &mPool, size);
return p;
}
NS_METHOD
ArenaImpl::Create(nsISupports *aOuter, REFNSIID aIID, void **aResult)
{
if (aOuter)
return NS_ERROR_NO_AGGREGATION;
ArenaImpl* it = new ArenaImpl();
if (nsnull == it)
return NS_ERROR_OUT_OF_MEMORY;
NS_ADDREF(it);
nsresult rv = it->QueryInterface(aIID, aResult);
NS_RELEASE(it);
return rv;
}
NS_COM nsresult NS_NewHeapArena(nsIArena** aInstancePtrResult,
PRUint32 aArenaBlockSize)
{
nsresult rv;
nsIArena* arena;
rv = ArenaImpl::Create(NULL, nsIArena::GetIID(), (void**)&arena);
if (NS_FAILED(rv)) return rv;
rv = arena->Init(aArenaBlockSize);
if (NS_FAILED(rv)) {
NS_RELEASE(arena);
return rv;
}
*aInstancePtrResult = arena;
return rv;
}