gecko-dev/layout/style/nsRuleData.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla Communicator client code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Original Author: David W. Hyatt (hyatt@netscape.com)
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "nsRuleData.h"
#include "nsCSSProps.h"
#include "nsPresArena.h"
inline size_t
nsRuleData::GetPoisonOffset()
{
// Fill in mValueOffsets such that mValueStorage + mValueOffsets[i]
// will yield the frame poison value for all uninitialized value
// offsets.
PR_STATIC_ASSERT(sizeof(PRUword) == sizeof(size_t));
PR_STATIC_ASSERT(PRUword(-1) > PRUword(0));
PR_STATIC_ASSERT(size_t(-1) > size_t(0));
PRUword framePoisonValue = nsPresArena::GetPoisonValue();
return size_t(framePoisonValue - PRUword(mValueStorage)) /
sizeof(nsCSSValue);
}
nsRuleData::nsRuleData(PRUint32 aSIDs, nsCSSValue* aValueStorage,
nsPresContext* aContext, nsStyleContext* aStyleContext)
: mSIDs(aSIDs),
mCanStoreInRuleTree(PR_TRUE),
mPresContext(aContext),
mStyleContext(aStyleContext),
mPostResolveCallback(nsnull),
mValueStorage(aValueStorage)
{
#ifndef MOZ_VALGRIND
size_t framePoisonOffset = GetPoisonOffset();
for (size_t i = 0; i < nsStyleStructID_Length; ++i) {
mValueOffsets[i] = framePoisonOffset;
}
#endif
}
#ifdef DEBUG
nsRuleData::~nsRuleData()
{
#ifndef MOZ_VALGRIND
// assert nothing in mSIDs has poison value
size_t framePoisonOffset = GetPoisonOffset();
for (size_t i = 0; i < nsStyleStructID_Length; ++i) {
NS_ABORT_IF_FALSE(!(mSIDs & (1 << i)) ||
mValueOffsets[i] != framePoisonOffset,
"value in SIDs was left with poison offset");
}
#endif
}
#endif