зеркало из https://github.com/mozilla/gecko-dev.git
136 строки
4.1 KiB
C++
136 строки
4.1 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/ArenaRefPtr.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 "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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class nsWindowSizes;
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template <size_t ArenaSize>
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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 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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return Allocate(aID, aSize);
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}
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void FreeByFrameID(nsQueryFrame::FrameIID aID, void* aPtr) {
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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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return Allocate(aID, aSize);
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}
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void FreeByObjectID(mozilla::ArenaObjectID aID, void* aPtr) {
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Free(aID, aPtr);
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}
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void* AllocateByCustomID(uint32_t aID, size_t aSize) {
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return Allocate(aID, aSize);
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}
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void FreeByCustomID(uint32_t aID, void* ptr) { Free(aID, ptr); }
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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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MOZ_ASSERT(!mArenaRefPtrs.Contains(aPtr));
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mArenaRefPtrs.Put(aPtr, T::ArenaObjectID());
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}
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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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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 ComputedStyles
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* pointing into the old rule tree aren't released afterwards, triggering an
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* assertion in ~ComputedStyle.
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*/
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void ClearArenaRefPtrs(mozilla::ArenaObjectID aObjectID);
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/**
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* Increment nsWindowSizes with sizes of interesting objects allocated in this
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* arena.
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*/
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void AddSizeOfExcludingThis(nsWindowSizes& aWindowSizes) const;
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void Check() { mPool.Check(); }
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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, mozilla::ArenaObjectID aObjectID);
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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[mozilla::eArenaObjectID_COUNT];
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mozilla::ArenaAllocator<ArenaSize, 8> mPool;
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nsDataHashtable<nsPtrHashKey<void>, mozilla::ArenaObjectID> mArenaRefPtrs;
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};
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#endif
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