gecko/layout/base/nsPresArena.h
L. David Baron f1fb6dbc73 Add poisoning for nsRuleData::mValueOffsets. (Bug 636039, patch 19) r=bzbarsky
I tested manually that after:
 (a) removing the |ruleData.mValueOffsets[aSID] = 0;| in
     nsRuleNode::WalkRuleTree
 (b) removing the NS_ABORT_IF_FALSE(aRuleData->mValueOffsets[aSID] == 0,
     ...) from nsRuleNode::CheckSpecifiedProperties and
     UnsetPropertiesWithoutFlags
that we crash dereferencing the poison address in a SetCoord call inside
nsRuleNode::ComputeTextResetData
2011-03-17 20:14:31 -07:00

94 lines
3.3 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: set ts=2 sw=2 et tw=78:
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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* the Initial Developer. All Rights Reserved.
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* Contributor(s):
* Steve Clark <buster@netscape.com>
* HÃ¥kan Waara <hwaara@chello.se>
* Dan Rosen <dr@netscape.com>
* Daniel Glazman <glazman@netscape.com>
* Mats Palmgren <mats.palmgren@bredband.net>
*
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* 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
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*
* ***** END LICENSE BLOCK *****
*/
#ifndef nsPresArena_h___
#define nsPresArena_h___
#include "nscore.h"
#include "nsQueryFrame.h"
// Uncomment this to disable arenas, instead forwarding to
// malloc for every allocation.
//#define DEBUG_TRACEMALLOC_PRESARENA 1
// The debugging version of nsPresArena does not free all the memory it
// allocated when the arena itself is destroyed.
#ifdef DEBUG_TRACEMALLOC_PRESARENA
#define PRESARENA_MUST_FREE_DURING_DESTROY PR_TRUE
#else
#define PRESARENA_MUST_FREE_DURING_DESTROY PR_FALSE
#endif
class nsPresArena {
public:
nsPresArena();
~nsPresArena();
// Pool allocation with recycler lists indexed by object size.
NS_HIDDEN_(void*) AllocateBySize(size_t aSize);
NS_HIDDEN_(void) FreeBySize(size_t aSize, void* aPtr);
// Pool allocation with recycler lists indexed by object-type code.
// Every type code must always be used with the same object size.
NS_HIDDEN_(void*) AllocateByCode(nsQueryFrame::FrameIID aCode, size_t aSize);
NS_HIDDEN_(void) FreeByCode(nsQueryFrame::FrameIID aCode, void* aPtr);
PRUint32 Size();
/**
* Get the poison value that can be used to fill a memory space with
* an address that leads to a safe crash when dereferenced.
*
* The caller is responsible for ensuring that a pres shell has been
* initialized before calling this.
*/
static PRUword GetPoisonValue();
private:
struct State;
State* mState;
};
#endif