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85 lines
2.8 KiB
C++
85 lines
2.8 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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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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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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struct nsArenaMemoryStats;
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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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nsRuleNode_id,
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nsStyleContext_id,
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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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/**
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* Fill aArenaStats with sizes of interesting objects allocated in
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* this arena and its mOther field with the size of everything else.
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*/
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void SizeOfExcludingThis(nsMallocSizeOfFun aMallocSizeOf,
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nsArenaMemoryStats* aArenaStats);
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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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