зеркало из https://github.com/mozilla/gecko-dev.git
Bug 1392881 - Merge StaticAtom and DynamicAtom. r=froydnj.
There's no reason for them to be separate, and we can use the |kind| field to distinguish the two kinds when necessary. This lets us remove the duplication of ScriptableToString(), ToUTF8String(), and ScriptableEquals(). It also lets us use |Atom*| pointers instead of |nsIAtom*| pointers in various places within nsAtomTable.cpp, which de-virtualizes various calls and removes the need for some static_casts. --HG-- extra : rebase_source : 2f9183323446e353f8cc5dcedf57d9dc9a38f0a7
This commit is contained in:
Nicholas Nethercote
Родитель
821308e4d1
Коммит
0a0c70a23a
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@ -28,20 +28,20 @@
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// There are two kinds of atoms handled by this module.
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//
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// - DynamicAtom: the atom itself is heap allocated, as is the nsStringBuffer it
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// points to. |gAtomTable| holds weak references to them DynamicAtoms. When
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// the refcount of a DynamicAtom drops to zero, we increment a static counter.
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// When that counter reaches a certain threshold, we iterate over the atom
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// table, removing and deleting DynamicAtoms with refcount zero. This allows
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// - Dynamic: the Atom itself is heap allocated, as is the nsStringBuffer it
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// points to. |gAtomTable| holds weak references to dynamic Atoms. When the
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// refcount of a dynamic Atom drops to zero, we increment a static counter.
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// When that counter reaches a certain threshold, we iterate over the Atom
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// table, removing and deleting dynamic Atoms with refcount zero. This allows
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// us to avoid acquiring the atom table lock during normal refcounting.
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//
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// - StaticAtom: the atom itself is heap allocated, but it points to a static
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// nsStringBuffer. |gAtomTable| effectively owns StaticAtoms, because such
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// atoms ignore all AddRef/Release calls, which ensures they stay alive until
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// - Static: the Atom itself is heap allocated, but it points to a static
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// nsStringBuffer. |gAtomTable| effectively owns static Atoms, because such
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// Atoms ignore all AddRef/Release calls, which ensures they stay alive until
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// |gAtomTable| itself is destroyed whereupon they are explicitly deleted.
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//
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// Note that gAtomTable is used on multiple threads, and callers must
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// acquire gAtomTableLock before touching it.
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// Note that gAtomTable is used on multiple threads, and callers must acquire
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// gAtomTableLock before touching it.
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using namespace mozilla;
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@ -69,77 +69,6 @@ class CheckStaticAtomSizes
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static Atomic<uint32_t, ReleaseAcquire> gUnusedAtomCount(0);
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class DynamicAtom final : public nsIAtom
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{
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public:
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static already_AddRefed<DynamicAtom> Create(const nsAString& aString, uint32_t aHash)
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{
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// The refcount is appropriately initialized in the constructor.
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return dont_AddRef(new DynamicAtom(aString, aHash));
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}
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static void GCAtomTable();
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enum class GCKind {
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RegularOperation,
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Shutdown,
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};
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static void GCAtomTableLocked(const MutexAutoLock& aProofOfLock,
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GCKind aKind);
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private:
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DynamicAtom(const nsAString& aString, uint32_t aHash)
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: mRefCnt(1)
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{
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mLength = aString.Length();
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SetKind(AtomKind::DynamicAtom);
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RefPtr<nsStringBuffer> buf = nsStringBuffer::FromString(aString);
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if (buf) {
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mString = static_cast<char16_t*>(buf->Data());
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} else {
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const size_t size = (mLength + 1) * sizeof(char16_t);
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buf = nsStringBuffer::Alloc(size);
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if (MOZ_UNLIKELY(!buf)) {
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// We OOM because atom allocations should be small and it's hard to
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// handle them more gracefully in a constructor.
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NS_ABORT_OOM(size);
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}
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mString = static_cast<char16_t*>(buf->Data());
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CopyUnicodeTo(aString, 0, mString, mLength);
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mString[mLength] = char16_t(0);
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}
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mHash = aHash;
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MOZ_ASSERT(mHash == HashString(mString, mLength));
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NS_ASSERTION(mString[mLength] == char16_t(0), "null terminated");
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NS_ASSERTION(buf && buf->StorageSize() >= (mLength + 1) * sizeof(char16_t),
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"enough storage");
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NS_ASSERTION(Equals(aString), "correct data");
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// Take ownership of buffer
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mozilla::Unused << buf.forget();
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}
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private:
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// We don't need a virtual destructor because we always delete via a
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// DynamicAtom* pointer (in GCAtomTable()), not an nsIAtom* pointer.
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~DynamicAtom();
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public:
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NS_DECL_NSIATOM
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NS_IMETHOD QueryInterface(REFNSIID aIID, void** aInstancePtr) final;
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typedef mozilla::TrueType HasThreadSafeRefCnt;
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MozExternalRefCountType DoAddRef();
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MozExternalRefCountType DoRelease();
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protected:
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ThreadSafeAutoRefCnt mRefCnt;
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NS_DECL_OWNINGTHREAD
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};
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#if defined(NS_BUILD_REFCNT_LOGGING)
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// nsFakeStringBuffers don't really use the refcounting system, but we
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// have to give a coherent series of addrefs and releases to the
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@ -173,10 +102,69 @@ private:
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UniquePtr<nsTArray<FakeBufferRefcountHelper>> gFakeBuffers;
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#endif
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class StaticAtom final : public nsIAtom
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class Atom final : public nsIAtom
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{
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public:
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StaticAtom(nsStringBuffer* aStringBuffer, uint32_t aLength, uint32_t aHash)
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static already_AddRefed<Atom> CreateDynamic(const nsAString& aString,
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uint32_t aHash)
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{
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// The refcount is appropriately initialized in the constructor.
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return dont_AddRef(new Atom(aString, aHash));
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}
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static Atom* CreateStatic(nsStringBuffer* aStringBuffer, uint32_t aLength,
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uint32_t aHash)
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{
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return new Atom(aStringBuffer, aLength, aHash);
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}
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static void GCAtomTable();
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enum class GCKind {
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RegularOperation,
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Shutdown,
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};
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static void GCAtomTableLocked(const MutexAutoLock& aProofOfLock,
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GCKind aKind);
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private:
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// This constructor is for dynamic Atoms.
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Atom(const nsAString& aString, uint32_t aHash)
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: mRefCnt(1)
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{
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mLength = aString.Length();
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SetKind(AtomKind::DynamicAtom);
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RefPtr<nsStringBuffer> buf = nsStringBuffer::FromString(aString);
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if (buf) {
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mString = static_cast<char16_t*>(buf->Data());
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} else {
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const size_t size = (mLength + 1) * sizeof(char16_t);
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buf = nsStringBuffer::Alloc(size);
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if (MOZ_UNLIKELY(!buf)) {
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// We OOM because atom allocations should be small and it's hard to
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// handle them more gracefully in a constructor.
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NS_ABORT_OOM(size);
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}
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mString = static_cast<char16_t*>(buf->Data());
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CopyUnicodeTo(aString, 0, mString, mLength);
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mString[mLength] = char16_t(0);
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}
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mHash = aHash;
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MOZ_ASSERT(mHash == HashString(mString, mLength));
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NS_ASSERTION(mString[mLength] == char16_t(0), "null terminated");
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NS_ASSERTION(buf && buf->StorageSize() >= (mLength + 1) * sizeof(char16_t),
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"enough storage");
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NS_ASSERTION(Equals(aString), "correct data");
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// Take ownership of buffer
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mozilla::Unused << buf.forget();
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}
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// This constructor is for static Atoms.
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Atom(nsStringBuffer* aStringBuffer, uint32_t aLength, uint32_t aHash)
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{
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mLength = aLength;
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SetKind(AtomKind::StaticAtom);
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@ -203,73 +191,65 @@ public:
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"correct storage");
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}
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// We don't need a virtual destructor because we always delete via a
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// StaticAtom* pointer (in AtomTableClearEntry()), not an nsIAtom* pointer.
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~StaticAtom() {}
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public:
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// We don't need a virtual destructor because we always delete via an Atom*
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// pointer (in AtomTableClearEntry() for static Atoms, and in
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// GCAtomTableLocked() for dynamic Atoms), not an nsIAtom* pointer.
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~Atom() {
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if (IsDynamicAtom()) {
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nsStringBuffer::FromData(mString)->Release();
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} else {
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MOZ_ASSERT(IsStaticAtom());
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}
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}
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NS_IMETHOD QueryInterface(REFNSIID aIID, void** aInstancePtr) final;
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NS_DECL_NSIATOM
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NS_IMETHOD QueryInterface(REFNSIID aIID, void** aInstancePtr) final;
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typedef mozilla::TrueType HasThreadSafeRefCnt;
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MozExternalRefCountType DynamicAddRef();
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MozExternalRefCountType DynamicRelease();
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protected:
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ThreadSafeAutoRefCnt mRefCnt;
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NS_DECL_OWNINGTHREAD
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};
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NS_IMPL_QUERY_INTERFACE(StaticAtom, nsIAtom);
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NS_IMPL_QUERY_INTERFACE(Atom, nsIAtom);
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NS_IMETHODIMP
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DynamicAtom::ScriptableToString(nsAString& aBuf)
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Atom::ScriptableToString(nsAString& aBuf)
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{
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nsStringBuffer::FromData(mString)->ToString(mLength, aBuf);
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return NS_OK;
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}
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NS_IMETHODIMP
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StaticAtom::ScriptableToString(nsAString& aBuf)
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{
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nsStringBuffer::FromData(mString)->ToString(mLength, aBuf);
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return NS_OK;
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}
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NS_IMETHODIMP
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DynamicAtom::ToUTF8String(nsACString& aBuf)
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Atom::ToUTF8String(nsACString& aBuf)
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{
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CopyUTF16toUTF8(nsDependentString(mString, mLength), aBuf);
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return NS_OK;
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}
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NS_IMETHODIMP
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StaticAtom::ToUTF8String(nsACString& aBuf)
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{
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CopyUTF16toUTF8(nsDependentString(mString, mLength), aBuf);
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return NS_OK;
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}
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NS_IMETHODIMP
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DynamicAtom::ScriptableEquals(const nsAString& aString, bool* aResult)
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{
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*aResult = aString.Equals(nsDependentString(mString, mLength));
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return NS_OK;
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}
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NS_IMETHODIMP
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StaticAtom::ScriptableEquals(const nsAString& aString, bool* aResult)
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Atom::ScriptableEquals(const nsAString& aString, bool* aResult)
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{
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*aResult = aString.Equals(nsDependentString(mString, mLength));
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return NS_OK;
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}
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NS_IMETHODIMP_(size_t)
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DynamicAtom::SizeOfIncludingThis(MallocSizeOf aMallocSizeOf)
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Atom::SizeOfIncludingThis(MallocSizeOf aMallocSizeOf)
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{
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size_t n = aMallocSizeOf(this);
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// String buffers pointed to by static atoms are in static memory, and so
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// are not measured here.
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if (IsDynamicAtom()) {
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n += nsStringBuffer::FromData(mString)->SizeOfIncludingThisIfUnshared(
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aMallocSizeOf);
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return n;
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} else {
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MOZ_ASSERT(IsStaticAtom());
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}
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NS_IMETHODIMP_(size_t)
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StaticAtom::SizeOfIncludingThis(MallocSizeOf aMallocSizeOf)
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{
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size_t n = aMallocSizeOf(this);
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// Don't measure the string buffer pointed to by the StaticAtom because it's
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// in static memory.
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return n;
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}
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@ -283,7 +263,7 @@ nsIAtom::AddRef()
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MOZ_ASSERT(IsStaticAtom());
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return 2;
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}
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return static_cast<DynamicAtom*>(this)->DoAddRef();
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return static_cast<Atom*>(this)->DynamicAddRef();
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}
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NS_IMETHODIMP_(MozExternalRefCountType)
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@ -294,7 +274,7 @@ nsIAtom::Release()
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MOZ_ASSERT(IsStaticAtom());
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return 1;
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}
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return static_cast<DynamicAtom*>(this)->DoRelease();
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return static_cast<Atom*>(this)->DynamicRelease();
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}
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//----------------------------------------------------------------------
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@ -361,10 +341,10 @@ struct AtomTableKey
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struct AtomTableEntry : public PLDHashEntryHdr
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{
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// These references are either to DynamicAtoms, in which case they are
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// non-owning, or they are to StaticAtoms, which aren't really refcounted.
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// These references are either to dynamic Atoms, in which case they are
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// non-owning, or they are to static Atoms, which aren't really refcounted.
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// See the comment at the top of this file for more details.
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nsIAtom* MOZ_NON_OWNING_REF mAtom;
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Atom* MOZ_NON_OWNING_REF mAtom;
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};
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static PLDHashNumber
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@ -394,13 +374,12 @@ static void
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AtomTableClearEntry(PLDHashTable* aTable, PLDHashEntryHdr* aEntry)
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{
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auto entry = static_cast<AtomTableEntry*>(aEntry);
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nsIAtom* atom = entry->mAtom;
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Atom* atom = entry->mAtom;
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if (atom->IsStaticAtom()) {
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// This case -- when the entry being cleared holds a StaticAtom -- only
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// occurs when gAtomTable is destroyed, whereupon all StaticAtoms within it
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// must be explicitly deleted. The cast is required because StaticAtom
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// doesn't have a virtual destructor.
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delete static_cast<StaticAtom*>(atom);
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// This case -- when the entry being cleared holds a static Atom -- only
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// occurs when gAtomTable is destroyed, whereupon all static Atoms within it
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// must be explicitly deleted.
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delete atom;
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}
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}
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@ -421,11 +400,11 @@ static const PLDHashTableOps AtomTableOps = {
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//----------------------------------------------------------------------
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#define RECENTLY_USED_MAIN_THREAD_ATOM_CACHE_SIZE 31
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static nsIAtom*
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static Atom*
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sRecentlyUsedMainThreadAtoms[RECENTLY_USED_MAIN_THREAD_ATOM_CACHE_SIZE] = {};
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void
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DynamicAtom::GCAtomTable()
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Atom::GCAtomTable()
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{
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if (NS_IsMainThread()) {
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MutexAutoLock lock(*gAtomTableLock);
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@ -434,8 +413,7 @@ DynamicAtom::GCAtomTable()
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}
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void
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DynamicAtom::GCAtomTableLocked(const MutexAutoLock& aProofOfLock,
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GCKind aKind)
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Atom::GCAtomTableLocked(const MutexAutoLock& aProofOfLock, GCKind aKind)
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{
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MOZ_ASSERT(NS_IsMainThread());
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for (uint32_t i = 0; i < RECENTLY_USED_MAIN_THREAD_ATOM_CACHE_SIZE; ++i) {
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@ -451,7 +429,7 @@ DynamicAtom::GCAtomTableLocked(const MutexAutoLock& aProofOfLock,
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continue;
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}
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auto atom = static_cast<DynamicAtom*>(entry->mAtom);
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Atom* atom = entry->mAtom;
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if (atom->mRefCnt == 0) {
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i.Remove();
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delete atom;
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|
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@ -502,11 +480,10 @@ DynamicAtom::GCAtomTableLocked(const MutexAutoLock& aProofOfLock,
|
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gUnusedAtomCount -= removedCount;
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}
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NS_IMPL_QUERY_INTERFACE(DynamicAtom, nsIAtom)
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MozExternalRefCountType
|
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DynamicAtom::DoAddRef()
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Atom::DynamicAddRef()
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{
|
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MOZ_ASSERT(IsDynamicAtom());
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nsrefcnt count = ++mRefCnt;
|
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if (count == 1) {
|
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gUnusedAtomCount--;
|
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|
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@ -523,8 +500,9 @@ static const uint32_t kAtomGCThreshold = 10000;
|
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#endif
|
||||
|
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MozExternalRefCountType
|
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DynamicAtom::DoRelease()
|
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Atom::DynamicRelease()
|
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{
|
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MOZ_ASSERT(IsDynamicAtom());
|
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MOZ_ASSERT(mRefCnt > 0);
|
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nsrefcnt count = --mRefCnt;
|
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if (count == 0) {
|
||||
|
|
@ -536,11 +514,6 @@ DynamicAtom::DoRelease()
|
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return count;
|
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}
|
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|
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DynamicAtom::~DynamicAtom()
|
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{
|
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nsStringBuffer::FromData(mString)->Release();
|
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}
|
||||
|
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//----------------------------------------------------------------------
|
||||
|
||||
class StaticAtomEntry : public PLDHashEntryHdr
|
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|
|
@ -572,7 +545,7 @@ public:
|
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|
||||
// Static Atoms aren't really refcounted. Because these entries live in a
|
||||
// global hashtable, this reference is essentially owning.
|
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StaticAtom* MOZ_OWNING_REF mAtom;
|
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Atom* MOZ_OWNING_REF mAtom;
|
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};
|
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|
||||
/**
|
||||
|
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@ -637,7 +610,7 @@ NS_ShutdownAtomTable()
|
|||
// builds.
|
||||
{
|
||||
MutexAutoLock lock(*gAtomTableLock);
|
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DynamicAtom::GCAtomTableLocked(lock, DynamicAtom::GCKind::Shutdown);
|
||||
Atom::GCAtomTableLocked(lock, Atom::GCKind::Shutdown);
|
||||
}
|
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#endif
|
||||
|
||||
|
|
@ -708,7 +681,7 @@ RegisterStaticAtoms(const nsStaticAtom* aAtoms, uint32_t aAtomCount)
|
|||
GetAtomHashEntry(static_cast<char16_t*>(stringBuffer->Data()),
|
||||
stringLen, &hash);
|
||||
|
||||
nsIAtom* atom = he->mAtom;
|
||||
Atom* atom = he->mAtom;
|
||||
if (atom) {
|
||||
// Disallow creating a dynamic atom, and then later, while the
|
||||
// dynamic atom is still alive, registering that same atom as a
|
||||
|
|
@ -721,7 +694,7 @@ RegisterStaticAtoms(const nsStaticAtom* aAtoms, uint32_t aAtomCount)
|
|||
"Static atom registration for %s should be pushed back", name.get());
|
||||
}
|
||||
} else {
|
||||
atom = new StaticAtom(stringBuffer, stringLen, hash);
|
||||
atom = Atom::CreateStatic(stringBuffer, stringLen, hash);
|
||||
he->mAtom = atom;
|
||||
}
|
||||
*atomp = atom;
|
||||
|
|
@ -730,7 +703,7 @@ RegisterStaticAtoms(const nsStaticAtom* aAtoms, uint32_t aAtomCount)
|
|||
StaticAtomEntry* entry =
|
||||
gStaticAtomTable->PutEntry(nsDependentAtomString(atom));
|
||||
MOZ_ASSERT(atom->IsStaticAtom());
|
||||
entry->mAtom = static_cast<StaticAtom*>(atom);
|
||||
entry->mAtom = atom;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
@ -761,7 +734,7 @@ NS_Atomize(const nsACString& aUTF8String)
|
|||
// Actually, now there is, sort of: ForgetSharedBuffer.
|
||||
nsString str;
|
||||
CopyUTF8toUTF16(aUTF8String, str);
|
||||
RefPtr<DynamicAtom> atom = DynamicAtom::Create(str, hash);
|
||||
RefPtr<Atom> atom = Atom::CreateDynamic(str, hash);
|
||||
|
||||
he->mAtom = atom;
|
||||
|
||||
|
|
@ -789,7 +762,7 @@ NS_Atomize(const nsAString& aUTF16String)
|
|||
return atom.forget();
|
||||
}
|
||||
|
||||
RefPtr<DynamicAtom> atom = DynamicAtom::Create(aUTF16String, hash);
|
||||
RefPtr<Atom> atom = Atom::CreateDynamic(aUTF16String, hash);
|
||||
he->mAtom = atom;
|
||||
|
||||
return atom.forget();
|
||||
|
|
@ -803,8 +776,7 @@ NS_AtomizeMainThread(const nsAString& aUTF16String)
|
|||
uint32_t hash;
|
||||
AtomTableKey key(aUTF16String.Data(), aUTF16String.Length(), &hash);
|
||||
uint32_t index = hash % RECENTLY_USED_MAIN_THREAD_ATOM_CACHE_SIZE;
|
||||
nsIAtom* atom =
|
||||
sRecentlyUsedMainThreadAtoms[index];
|
||||
Atom* atom = sRecentlyUsedMainThreadAtoms[index];
|
||||
if (atom) {
|
||||
uint32_t length = atom->GetLength();
|
||||
if (length == key.mLength &&
|
||||
|
|
@ -821,18 +793,19 @@ NS_AtomizeMainThread(const nsAString& aUTF16String)
|
|||
if (he->mAtom) {
|
||||
retVal = he->mAtom;
|
||||
} else {
|
||||
retVal = DynamicAtom::Create(aUTF16String, hash);
|
||||
he->mAtom = retVal;
|
||||
RefPtr<Atom> newAtom = Atom::CreateDynamic(aUTF16String, hash);
|
||||
he->mAtom = newAtom;
|
||||
retVal = newAtom.forget();
|
||||
}
|
||||
|
||||
sRecentlyUsedMainThreadAtoms[index] = retVal;
|
||||
sRecentlyUsedMainThreadAtoms[index] = he->mAtom;
|
||||
return retVal.forget();
|
||||
}
|
||||
|
||||
nsrefcnt
|
||||
NS_GetNumberOfAtoms(void)
|
||||
{
|
||||
DynamicAtom::GCAtomTable(); // Trigger a GC so that we return a deterministic result.
|
||||
Atom::GCAtomTable(); // Trigger a GC so that we return a deterministic result.
|
||||
MutexAutoLock lock(*gAtomTableLock);
|
||||
return gAtomTable->EntryCount();
|
||||
}
|
||||
|
|
|
|||
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