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113 lines
4.2 KiB
C++
113 lines
4.2 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* vim: set ts=2 sw=2 et tw=78:
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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.org 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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* Steve Clark <buster@netscape.com>
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* Håkan Waara <hwaara@chello.se>
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* Dan Rosen <dr@netscape.com>
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* Daniel Glazman <glazman@netscape.com>
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* Mats Palmgren <mats.palmgren@bredband.net>
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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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*/
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#ifndef nsPresArena_h___
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#define nsPresArena_h___
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#include "nscore.h"
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#include "nsQueryFrame.h"
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#include "mozilla/StandardInteger.h"
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// Uncomment this to disable arenas, instead forwarding to
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// malloc for every allocation.
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//#define DEBUG_TRACEMALLOC_PRESARENA 1
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// The debugging version of nsPresArena does not free all the memory it
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// allocated when the arena itself is destroyed.
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#ifdef DEBUG_TRACEMALLOC_PRESARENA
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#define PRESARENA_MUST_FREE_DURING_DESTROY true
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#else
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#define PRESARENA_MUST_FREE_DURING_DESTROY false
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#endif
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class nsPresArena {
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public:
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nsPresArena();
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~nsPresArena();
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// Pool allocation with recycler lists indexed by object size, aSize.
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NS_HIDDEN_(void*) AllocateBySize(size_t aSize);
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NS_HIDDEN_(void) FreeBySize(size_t aSize, void* aPtr);
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// Pool allocation with recycler lists indexed by frame-type ID.
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// Every aID must always be used with the same object size, aSize.
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NS_HIDDEN_(void*) AllocateByFrameID(nsQueryFrame::FrameIID aID, size_t aSize);
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NS_HIDDEN_(void) FreeByFrameID(nsQueryFrame::FrameIID aID, void* aPtr);
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enum ObjectID {
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nsLineBox_id = nsQueryFrame::NON_FRAME_MARKER,
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// The PresArena implementation uses this bit to distinguish objects
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// allocated by size from objects allocated by type ID (that is, frames
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// using AllocateByFrameID and other objects using AllocateByObjectID).
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// It should not collide with any Object ID (above) or frame ID (in
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// nsQueryFrame.h). It is not 0x80000000 to avoid the question of
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// whether enumeration constants are signed.
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NON_OBJECT_MARKER = 0x40000000
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};
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// Pool allocation with recycler lists indexed by object-type ID (see above).
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// Every aID must always be used with the same object size, aSize.
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NS_HIDDEN_(void*) AllocateByObjectID(ObjectID aID, size_t aSize);
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NS_HIDDEN_(void) FreeByObjectID(ObjectID aID, void* aPtr);
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size_t SizeOfExcludingThis(nsMallocSizeOfFun aMallocSizeOf) const;
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/**
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* Get the poison value that can be used to fill a memory space with
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* an address that leads to a safe crash when dereferenced.
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*
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* The caller is responsible for ensuring that a pres shell has been
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* initialized before calling this.
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*/
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static uintptr_t GetPoisonValue();
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private:
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struct State;
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State* mState;
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};
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#endif
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