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68 lines
2.0 KiB
C++
68 lines
2.0 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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/ArenaAllocator.h"
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#include "mozilla/ArenaObjectID.h"
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#include "mozilla/Assertions.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 "nsHashKeys.h"
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#include "nsTArray.h"
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#include "nsTHashtable.h"
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class nsWindowSizes;
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template <size_t ArenaSize, typename ObjectId, size_t ObjectIdCount>
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class nsPresArena {
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public:
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nsPresArena() = default;
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~nsPresArena();
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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* Allocate(ObjectId aCode, size_t aSize);
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void Free(ObjectId aCode, void* aPtr);
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enum class ArenaKind { PresShell, DisplayList };
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/**
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* Increment nsWindowSizes with sizes of interesting objects allocated in this
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* arena, and put the general unclassified size in the relevant field
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* depending on the arena size.
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*/
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void AddSizeOfExcludingThis(nsWindowSizes&, ArenaKind) const;
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void Check() { mPool.Check(); }
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private:
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class FreeList {
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public:
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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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FreeList() : mEntrySize(0), mEntriesEverAllocated(0) {}
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size_t SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) const {
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return mEntries.ShallowSizeOfExcludingThis(aMallocSizeOf);
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}
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};
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FreeList mFreeLists[ObjectIdCount];
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mozilla::ArenaAllocator<ArenaSize, 8> mPool;
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};
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#endif
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