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nsPresArena.h


products/Sources/formale Sprachen/C/Firefox/layout/base/nsPresArena.h

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ /* vim: set ts=8 sts=2 et sw=2 tw=80: */ /* This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ /* arena allocation for the frame tree and closely-related objects */ #ifndef nsPresArena_h___ #define nsPresArena_h___ #include "mozilla/ArenaAllocator.h" #include "mozilla/ArenaObjectID.h" #include "mozilla/Assertions.h" #include "mozilla/MemoryChecking.h" // Note: Do not remove this, needed for MOZ_HAVE_MEM_CHECKS below #include "mozilla/MemoryReporting.h" #include #include "nscore.h" #include "nsHashKeys.h" #include "nsTArray.h" #include "nsTHashtable.h" class nsWindowSizes; template class nsPresArena { public: nsPresArena() = default; ~nsPresArena(); /** * Pool allocation with recycler lists indexed by object-type ID (see above). * Every aID must always be used with the same object size, aSize. */ void* Allocate(ObjectId aCode, size_t aSize); void Free(ObjectId aCode, void* aPtr); enum class ArenaKind { PresShell, DisplayList }; /** * Increment nsWindowSizes with sizes of interesting objects allocated in this * arena, and put the general unclassified size in the relevant field * depending on the arena size. */ void AddSizeOfExcludingThis(nsWindowSizes&, ArenaKind) const; void Check() { mPool.Check(); } private: class FreeList { public: nsTArray mEntries; size_t mEntrySize; size_t mEntriesEverAllocated; FreeList() : mEntrySize(0), mEntriesEverAllocated(0) {} size_t SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) const { return mEntries.ShallowSizeOfExcludingThis(aMallocSizeOf); } }; FreeList mFreeLists[ObjectIdCount]; mozilla::ArenaAllocator mPool; }; #endif

                                                                                                                                                                                                                                                                                                                                                                                                     

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