mirror of
https://github.com/classilla/tenfourfox.git
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164 lines
4.8 KiB
C
164 lines
4.8 KiB
C
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/* -*- 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/ArenaObjectID.h"
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#include "mozilla/ArenaRefPtr.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 "nsDataHashtable.h"
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#include "nsHashKeys.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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/**
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* Pool allocation with recycler lists indexed by object size, aSize.
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*/
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void* AllocateBySize(size_t aSize)
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{
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return Allocate(uint32_t(aSize) |
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uint32_t(mozilla::eArenaObjectID_NON_OBJECT_MARKER), aSize);
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}
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void FreeBySize(size_t aSize, void* aPtr)
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{
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Free(uint32_t(aSize) |
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uint32_t(mozilla::eArenaObjectID_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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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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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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void* AllocateByObjectID(mozilla::ArenaObjectID aID, size_t aSize)
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{
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return Allocate(aID, aSize);
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}
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void FreeByObjectID(mozilla::ArenaObjectID 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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* Register an ArenaRefPtr to be cleared when this arena is about to
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* be destroyed.
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*
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* (Defined in ArenaRefPtrInlines.h.)
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*
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* @param aPtr The ArenaRefPtr to clear.
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* @param aObjectID The ArenaObjectID value that uniquely identifies
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* the type of object the ArenaRefPtr holds.
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*/
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template<typename T>
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void RegisterArenaRefPtr(mozilla::ArenaRefPtr<T>* aPtr);
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/**
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* Deregister an ArenaRefPtr that was previously registered with
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* RegisterArenaRefPtr.
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*/
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template<typename T>
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void DeregisterArenaRefPtr(mozilla::ArenaRefPtr<T>* aPtr)
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{
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MOZ_ASSERT(mArenaRefPtrs.Contains(aPtr));
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mArenaRefPtrs.Remove(aPtr);
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}
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/**
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* Clears all currently registered ArenaRefPtrs. This will be called during
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* the destructor, but can be called by users of nsPresArena who want to
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* ensure arena-allocated objects are released earlier.
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*/
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void ClearArenaRefPtrs();
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/**
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* Clears all currently registered ArenaRefPtrs for the given ArenaObjectID.
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* This is called when we reconstruct the rule tree so that style contexts
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* pointing into the old rule tree aren't released afterwards, triggering an
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* assertion in ~nsStyleContext.
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*/
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void ClearArenaRefPtrs(mozilla::ArenaObjectID aObjectID);
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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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void* Allocate(uint32_t aCode, size_t aSize);
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void Free(uint32_t aCode, void* aPtr);
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inline void ClearArenaRefPtrWithoutDeregistering(
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void* aPtr,
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mozilla::ArenaObjectID aObjectID);
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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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explicit 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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size_t SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) const
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{ return mEntries.ShallowSizeOfExcludingThis(aMallocSizeOf); }
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enum { ALLOW_MEMMOVE = false };
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};
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nsTHashtable<FreeList> mFreeLists;
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PLArenaPool mPool;
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nsDataHashtable<nsPtrHashKey<void>, mozilla::ArenaObjectID> mArenaRefPtrs;
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};
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#endif
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