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137 lines
4.1 KiB
C++
137 lines
4.1 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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/* arena allocation for the frame tree and closely-related objects */
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#ifndef nsPresArena_h___
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#define nsPresArena_h___
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#include "mozilla/MemoryChecking.h" // Note: Do not remove this, needed for MOZ_HAVE_MEM_CHECKS below
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#include "mozilla/MemoryReporting.h"
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#include <stdint.h>
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#include "nscore.h"
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#include "nsQueryFrame.h"
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#include "nsTArray.h"
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#include "nsTHashtable.h"
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#include "plarena.h"
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struct nsArenaMemoryStats;
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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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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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nsFrameList_id,
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/**
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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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*/
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NON_OBJECT_MARKER = 0x40000000
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};
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/**
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* Pool allocation with recycler lists indexed by object size, aSize.
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*/
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NS_HIDDEN_(void*) AllocateBySize(size_t aSize)
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{
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return Allocate(uint32_t(aSize) | uint32_t(NON_OBJECT_MARKER), aSize);
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}
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NS_HIDDEN_(void) FreeBySize(size_t aSize, void* aPtr)
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{
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Free(uint32_t(aSize) | uint32_t(NON_OBJECT_MARKER), aPtr);
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}
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/**
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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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*/
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NS_HIDDEN_(void*) AllocateByFrameID(nsQueryFrame::FrameIID aID, size_t aSize)
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{
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return Allocate(aID, aSize);
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}
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NS_HIDDEN_(void) FreeByFrameID(nsQueryFrame::FrameIID aID, void* aPtr)
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{
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Free(aID, aPtr);
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}
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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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*/
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NS_HIDDEN_(void*) AllocateByObjectID(ObjectID aID, size_t aSize)
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{
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return Allocate(aID, aSize);
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}
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NS_HIDDEN_(void) FreeByObjectID(ObjectID aID, void* aPtr)
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{
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Free(aID, aPtr);
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}
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/**
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* Increment aArenaStats with sizes of interesting objects allocated in this
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* arena and its mOther field with the size of everything else.
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*/
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void AddSizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf,
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nsArenaMemoryStats* aArenaStats);
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private:
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NS_HIDDEN_(void*) Allocate(uint32_t aCode, size_t aSize);
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NS_HIDDEN_(void) Free(uint32_t aCode, void* aPtr);
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// All keys to this hash table fit in 32 bits (see below) so we do not
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// bother actually hashing them.
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class FreeList : public PLDHashEntryHdr
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{
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public:
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typedef uint32_t KeyType;
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nsTArray<void *> mEntries;
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size_t mEntrySize;
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size_t mEntriesEverAllocated;
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typedef const void* KeyTypePointer;
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KeyTypePointer mKey;
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FreeList(KeyTypePointer aKey)
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: mEntrySize(0), mEntriesEverAllocated(0), mKey(aKey) {}
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// Default copy constructor and destructor are ok.
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bool KeyEquals(KeyTypePointer const aKey) const
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{ return mKey == aKey; }
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static KeyTypePointer KeyToPointer(KeyType aKey)
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{ return NS_INT32_TO_PTR(aKey); }
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static PLDHashNumber HashKey(KeyTypePointer aKey)
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{ return NS_PTR_TO_INT32(aKey); }
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enum { ALLOW_MEMMOVE = false };
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};
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#if defined(MOZ_HAVE_MEM_CHECKS)
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static PLDHashOperator UnpoisonFreeList(FreeList* aEntry, void*);
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#endif
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static PLDHashOperator FreeListEnumerator(FreeList* aEntry, void* aData);
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static size_t SizeOfFreeListEntryExcludingThis(FreeList* aEntry,
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mozilla::MallocSizeOf aMallocSizeOf,
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void*);
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nsTHashtable<FreeList> mFreeLists;
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PLArenaPool mPool;
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};
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#endif
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