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