mirror of
https://github.com/classilla/tenfourfox.git
synced 2024-09-09 04:54:33 +00:00
763 lines
21 KiB
C++
763 lines
21 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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#include "mozilla/Assertions.h"
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#include "mozilla/Attributes.h"
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#include "mozilla/Compiler.h"
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#include "mozilla/HashFunctions.h"
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#include "mozilla/MemoryReporting.h"
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#include "mozilla/DebugOnly.h"
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#include "mozilla/unused.h"
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#include "nsAtomTable.h"
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#include "nsStaticAtom.h"
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#include "nsString.h"
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#include "nsCRT.h"
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#include "PLDHashTable.h"
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#include "prenv.h"
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#include "nsThreadUtils.h"
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#include "nsDataHashtable.h"
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#include "nsHashKeys.h"
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#include "nsAutoPtr.h"
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#include "nsUnicharUtils.h"
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using namespace mozilla;
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#if defined(__clang__)
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# pragma GCC diagnostic ignored "-Wdelete-non-virtual-dtor"
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#elif MOZ_IS_GCC
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# if MOZ_GCC_VERSION_AT_LEAST(4, 7, 0)
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# pragma GCC diagnostic ignored "-Wdelete-non-virtual-dtor"
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# endif
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#endif
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/**
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* The shared hash table for atom lookups.
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*
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* XXX This should be manipulated in a threadsafe way or we should make
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* sure it's only manipulated from the main thread. Probably the latter
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* is better, since the former would hurt performance.
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*/
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static PLDHashTable* gAtomTable;
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class StaticAtomEntry : public PLDHashEntryHdr
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{
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public:
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typedef const nsAString& KeyType;
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typedef const nsAString* KeyTypePointer;
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explicit StaticAtomEntry(KeyTypePointer aKey) {}
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StaticAtomEntry(const StaticAtomEntry& aOther) : mAtom(aOther.mAtom) {}
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~StaticAtomEntry() {}
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bool KeyEquals(KeyTypePointer aKey) const
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{
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return mAtom->Equals(*aKey);
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}
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static KeyTypePointer KeyToPointer(KeyType aKey) { return &aKey; }
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static PLDHashNumber HashKey(KeyTypePointer aKey)
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{
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return HashString(*aKey);
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}
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enum { ALLOW_MEMMOVE = true };
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// mAtom only points to objects of type PermanentAtomImpl, which are not
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// really refcounted. But since these entries live in a global hashtable,
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// this reference is essentially owning.
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nsIAtom* MOZ_OWNING_REF mAtom;
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};
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/**
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* A hashtable of static atoms that existed at app startup. This hashtable
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* helps nsHtml5AtomTable.
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*/
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typedef nsTHashtable<StaticAtomEntry> StaticAtomTable;
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static StaticAtomTable* gStaticAtomTable = nullptr;
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/**
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* Whether it is still OK to add atoms to gStaticAtomTable.
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*/
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static bool gStaticAtomTableSealed = false;
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//----------------------------------------------------------------------
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/**
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* Note that AtomImpl objects are sometimes converted into PermanentAtomImpl
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* objects using placement new and just overwriting the vtable pointer.
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*/
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class AtomImpl : public nsIAtom
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{
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public:
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AtomImpl(const nsAString& aString, uint32_t aHash);
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// This is currently only used during startup when creating a permanent atom
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// from NS_RegisterStaticAtoms
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AtomImpl(nsStringBuffer* aData, uint32_t aLength, uint32_t aHash);
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protected:
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// This is only intended to be used when a normal atom is turned into a
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// permanent one.
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AtomImpl()
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{
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// We can't really assert that mString is a valid nsStringBuffer string,
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// so do the best we can do and check for some consistencies.
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NS_ASSERTION((mLength + 1) * sizeof(char16_t) <=
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nsStringBuffer::FromData(mString)->StorageSize() &&
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mString[mLength] == 0,
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"Not initialized atom");
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}
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// We don't need a virtual destructor here because PermanentAtomImpl
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// deletions aren't handled through Release().
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~AtomImpl();
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public:
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NS_DECL_ISUPPORTS
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NS_DECL_NSIATOM
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enum { REFCNT_PERMANENT_SENTINEL = UINT32_MAX };
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virtual bool IsPermanent();
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// We can't use the virtual function in the base class destructor.
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bool IsPermanentInDestructor()
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{
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return mRefCnt == REFCNT_PERMANENT_SENTINEL;
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}
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// for |#ifdef NS_BUILD_REFCNT_LOGGING| access to reference count
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nsrefcnt GetRefCount() { return mRefCnt; }
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size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf);
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};
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/**
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* A non-refcounted implementation of nsIAtom.
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*/
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class PermanentAtomImpl final : public AtomImpl
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{
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public:
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PermanentAtomImpl(const nsAString& aString, PLDHashNumber aKeyHash)
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: AtomImpl(aString, aKeyHash)
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{
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}
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PermanentAtomImpl(nsStringBuffer* aData, uint32_t aLength,
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PLDHashNumber aKeyHash)
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: AtomImpl(aData, aLength, aKeyHash)
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{
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}
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PermanentAtomImpl() {}
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~PermanentAtomImpl();
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virtual bool IsPermanent();
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// SizeOfIncludingThis() isn't needed -- the one inherited from AtomImpl is
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// good enough, because PermanentAtomImpl doesn't add any new data members.
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void* operator new(size_t aSize, AtomImpl* aAtom) CPP_THROW_NEW;
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void* operator new(size_t aSize) CPP_THROW_NEW
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{
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return ::operator new(aSize);
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}
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private:
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NS_IMETHOD_(MozExternalRefCountType) AddRef();
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NS_IMETHOD_(MozExternalRefCountType) Release();
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};
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//----------------------------------------------------------------------
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struct AtomTableEntry : public PLDHashEntryHdr
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{
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// These references are either to non-permanent atoms, in which case they are
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// non-owning, or they are to permanent atoms that are not really refcounted.
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// The exact lifetime rules are documented in AtomTableClearEntry.
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AtomImpl* MOZ_NON_OWNING_REF mAtom;
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};
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struct AtomTableKey
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{
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AtomTableKey(const char16_t* aUTF16String, uint32_t aLength, uint32_t aHash)
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: mUTF16String(aUTF16String)
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, mUTF8String(nullptr)
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, mLength(aLength)
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, mHash(aHash)
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{
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MOZ_ASSERT(mHash == HashString(mUTF16String, mLength));
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}
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AtomTableKey(const char* aUTF8String, uint32_t aLength, uint32_t aHash)
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: mUTF16String(nullptr)
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, mUTF8String(aUTF8String)
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, mLength(aLength)
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, mHash(aHash)
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{
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mozilla::DebugOnly<bool> err;
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MOZ_ASSERT(aHash == HashUTF8AsUTF16(mUTF8String, mLength, &err));
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}
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AtomTableKey(const char16_t* aUTF16String, uint32_t aLength,
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uint32_t* aHashOut)
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: mUTF16String(aUTF16String)
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, mUTF8String(nullptr)
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, mLength(aLength)
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{
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mHash = HashString(mUTF16String, mLength);
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*aHashOut = mHash;
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}
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AtomTableKey(const char* aUTF8String, uint32_t aLength, uint32_t* aHashOut)
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: mUTF16String(nullptr)
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, mUTF8String(aUTF8String)
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, mLength(aLength)
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{
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bool err;
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mHash = HashUTF8AsUTF16(mUTF8String, mLength, &err);
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if (err) {
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mUTF8String = nullptr;
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mLength = 0;
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mHash = 0;
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}
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*aHashOut = mHash;
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}
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const char16_t* mUTF16String;
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const char* mUTF8String;
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uint32_t mLength;
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uint32_t mHash;
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};
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static PLDHashNumber
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AtomTableGetHash(PLDHashTable* aTable, const void* aKey)
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{
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const AtomTableKey* k = static_cast<const AtomTableKey*>(aKey);
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return k->mHash;
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}
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static bool
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AtomTableMatchKey(PLDHashTable* aTable, const PLDHashEntryHdr* aEntry,
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const void* aKey)
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{
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const AtomTableEntry* he = static_cast<const AtomTableEntry*>(aEntry);
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const AtomTableKey* k = static_cast<const AtomTableKey*>(aKey);
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if (k->mUTF8String) {
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return
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CompareUTF8toUTF16(nsDependentCSubstring(k->mUTF8String,
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k->mUTF8String + k->mLength),
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nsDependentAtomString(he->mAtom)) == 0;
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}
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uint32_t length = he->mAtom->GetLength();
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if (length != k->mLength) {
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return false;
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}
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return memcmp(he->mAtom->GetUTF16String(),
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k->mUTF16String, length * sizeof(char16_t)) == 0;
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}
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static void
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AtomTableClearEntry(PLDHashTable* aTable, PLDHashEntryHdr* aEntry)
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{
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// Normal |AtomImpl| atoms are deleted when their refcount hits 0, and
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// they then remove themselves from the table. In other words, they
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// are owned by the callers who own references to them.
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// |PermanentAtomImpl| permanent atoms ignore their refcount and are
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// deleted when they are removed from the table at table destruction.
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// In other words, they are owned by the atom table.
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AtomImpl* atom = static_cast<AtomTableEntry*>(aEntry)->mAtom;
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if (atom->IsPermanent()) {
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// Note that the cast here is important since AtomImpls doesn't have a
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// virtual dtor.
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delete static_cast<PermanentAtomImpl*>(atom);
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}
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}
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static void
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AtomTableInitEntry(PLDHashEntryHdr* aEntry, const void* aKey)
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{
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static_cast<AtomTableEntry*>(aEntry)->mAtom = nullptr;
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}
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static const PLDHashTableOps AtomTableOps = {
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AtomTableGetHash,
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AtomTableMatchKey,
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PLDHashTable::MoveEntryStub,
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AtomTableClearEntry,
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AtomTableInitEntry
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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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sRecentlyUsedMainThreadAtoms[RECENTLY_USED_MAIN_THREAD_ATOM_CACHE_SIZE] = {};
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static inline
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void
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PromoteToPermanent(AtomImpl* aAtom)
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{
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#ifdef NS_BUILD_REFCNT_LOGGING
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{
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nsrefcnt refcount = aAtom->GetRefCount();
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do {
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NS_LOG_RELEASE(aAtom, --refcount, "AtomImpl");
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} while (refcount);
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}
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#endif
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aAtom = new (aAtom) PermanentAtomImpl();
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}
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void
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NS_PurgeAtomTable()
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{
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delete gStaticAtomTable;
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gStaticAtomTable = nullptr;
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if (gAtomTable) {
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#ifdef DEBUG
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const char* dumpAtomLeaks = PR_GetEnv("MOZ_DUMP_ATOM_LEAKS");
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if (dumpAtomLeaks && *dumpAtomLeaks) {
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uint32_t leaked = 0;
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printf("*** %d atoms still exist (including permanent):\n",
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gAtomTable->EntryCount());
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for (auto iter = gAtomTable->Iter(); !iter.Done(); iter.Next()) {
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auto entry = static_cast<AtomTableEntry*>(iter.Get());
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AtomImpl* atom = entry->mAtom;
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if (!atom->IsPermanent()) {
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leaked++;
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nsAutoCString str;
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atom->ToUTF8String(str);
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fputs(str.get(), stdout);
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fputs("\n", stdout);
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}
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}
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printf("*** %u non-permanent atoms leaked\n", leaked);
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}
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#endif
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delete gAtomTable;
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gAtomTable = nullptr;
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}
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}
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AtomImpl::AtomImpl(const nsAString& aString, uint32_t aHash)
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{
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mLength = aString.Length();
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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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buf = nsStringBuffer::Alloc((mLength + 1) * sizeof(char16_t));
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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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AtomImpl::AtomImpl(nsStringBuffer* aStringBuffer, uint32_t aLength,
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uint32_t aHash)
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{
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mLength = aLength;
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mString = static_cast<char16_t*>(aStringBuffer->Data());
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// Technically we could currently avoid doing this addref by instead making
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// the static atom buffers have an initial refcount of 2.
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aStringBuffer->AddRef();
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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(aStringBuffer &&
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aStringBuffer->StorageSize() == (mLength + 1) * sizeof(char16_t),
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"correct storage");
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}
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AtomImpl::~AtomImpl()
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{
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MOZ_ASSERT(gAtomTable, "uninitialized atom hashtable");
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// Permanent atoms are removed from the hashtable at shutdown, and we
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// don't want to remove them twice. See comment above in
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// |AtomTableClearEntry|.
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if (!IsPermanentInDestructor()) {
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AtomTableKey key(mString, mLength, mHash);
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gAtomTable->Remove(&key);
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if (gAtomTable->EntryCount() == 0) {
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delete gAtomTable;
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gAtomTable = nullptr;
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}
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}
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nsStringBuffer::FromData(mString)->Release();
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}
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NS_IMPL_ISUPPORTS(AtomImpl, nsIAtom)
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PermanentAtomImpl::~PermanentAtomImpl()
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{
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// So we can tell if we were permanent while running the base class dtor.
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mRefCnt = REFCNT_PERMANENT_SENTINEL;
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}
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NS_IMETHODIMP_(MozExternalRefCountType)
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PermanentAtomImpl::AddRef()
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{
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MOZ_ASSERT(NS_IsMainThread(), "wrong thread");
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return 2;
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}
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NS_IMETHODIMP_(MozExternalRefCountType)
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PermanentAtomImpl::Release()
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{
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MOZ_ASSERT(NS_IsMainThread(), "wrong thread");
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return 1;
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}
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/* virtual */ bool
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AtomImpl::IsPermanent()
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{
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return false;
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}
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/* virtual */ bool
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PermanentAtomImpl::IsPermanent()
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{
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return true;
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}
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void*
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PermanentAtomImpl::operator new(size_t aSize, AtomImpl* aAtom) CPP_THROW_NEW
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{
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MOZ_ASSERT(!aAtom->IsPermanent(),
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"converting atom that's already permanent");
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// Just let the constructor overwrite the vtable pointer.
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return aAtom;
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}
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NS_IMETHODIMP
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AtomImpl::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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AtomImpl::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_(bool)
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AtomImpl::EqualsUTF8(const nsACString& aString)
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{
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return CompareUTF8toUTF16(aString,
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nsDependentString(mString, mLength)) == 0;
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}
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NS_IMETHODIMP
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AtomImpl::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_(bool)
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AtomImpl::IsStaticAtom()
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{
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return IsPermanent();
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}
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size_t
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AtomImpl::SizeOfIncludingThis(MallocSizeOf aMallocSizeOf)
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{
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size_t n = aMallocSizeOf(this);
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// Don't measure static atoms. Nb: here "static" means "permanent", and while
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// it's not guaranteed that permanent atoms are actually stored in static
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// data, it is very likely. And we don't want to call |aMallocSizeOf| on
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// static data, so we err on the side of caution.
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if (!IsStaticAtom()) {
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n += nsStringBuffer::FromData(mString)->SizeOfIncludingThisIfUnshared(
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aMallocSizeOf);
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}
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return n;
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}
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//----------------------------------------------------------------------
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void
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NS_SizeOfAtomTablesIncludingThis(MallocSizeOf aMallocSizeOf,
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size_t* aMain, size_t* aStatic)
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{
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*aMain = 0;
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if (gAtomTable) {
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*aMain += gAtomTable->ShallowSizeOfIncludingThis(aMallocSizeOf);
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for (auto iter = gAtomTable->Iter(); !iter.Done(); iter.Next()) {
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auto entry = static_cast<AtomTableEntry*>(iter.Get());
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*aMain += entry->mAtom->SizeOfIncludingThis(aMallocSizeOf);
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}
|
|
}
|
|
|
|
// The atoms in the this table are almost certainly stored in static data, so
|
|
// we don't need to measure entries separately.
|
|
*aStatic = gStaticAtomTable
|
|
? gStaticAtomTable->ShallowSizeOfIncludingThis(aMallocSizeOf)
|
|
: 0;
|
|
}
|
|
|
|
#define ATOM_HASHTABLE_INITIAL_LENGTH 2048
|
|
|
|
static inline void
|
|
EnsureTableExists()
|
|
{
|
|
if (!gAtomTable) {
|
|
gAtomTable = new PLDHashTable(&AtomTableOps, sizeof(AtomTableEntry),
|
|
ATOM_HASHTABLE_INITIAL_LENGTH);
|
|
}
|
|
}
|
|
|
|
static inline AtomTableEntry*
|
|
GetAtomHashEntry(const char* aString, uint32_t aLength, uint32_t* aHashOut)
|
|
{
|
|
MOZ_ASSERT(NS_IsMainThread(), "wrong thread");
|
|
EnsureTableExists();
|
|
AtomTableKey key(aString, aLength, aHashOut);
|
|
// This is an infallible add.
|
|
return static_cast<AtomTableEntry*>(gAtomTable->Add(&key));
|
|
}
|
|
|
|
static inline AtomTableEntry*
|
|
GetAtomHashEntry(const char16_t* aString, uint32_t aLength, uint32_t* aHashOut)
|
|
{
|
|
MOZ_ASSERT(NS_IsMainThread(), "wrong thread");
|
|
EnsureTableExists();
|
|
AtomTableKey key(aString, aLength, aHashOut);
|
|
// This is an infallible add.
|
|
return static_cast<AtomTableEntry*>(gAtomTable->Add(&key));
|
|
}
|
|
|
|
class CheckStaticAtomSizes
|
|
{
|
|
CheckStaticAtomSizes()
|
|
{
|
|
static_assert((sizeof(nsFakeStringBuffer<1>().mRefCnt) ==
|
|
sizeof(nsStringBuffer().mRefCount)) &&
|
|
(sizeof(nsFakeStringBuffer<1>().mSize) ==
|
|
sizeof(nsStringBuffer().mStorageSize)) &&
|
|
(offsetof(nsFakeStringBuffer<1>, mRefCnt) ==
|
|
offsetof(nsStringBuffer, mRefCount)) &&
|
|
(offsetof(nsFakeStringBuffer<1>, mSize) ==
|
|
offsetof(nsStringBuffer, mStorageSize)) &&
|
|
(offsetof(nsFakeStringBuffer<1>, mStringData) ==
|
|
sizeof(nsStringBuffer)),
|
|
"mocked-up strings' representations should be compatible");
|
|
}
|
|
};
|
|
|
|
nsresult
|
|
RegisterStaticAtoms(const nsStaticAtom* aAtoms, uint32_t aAtomCount)
|
|
{
|
|
if (!gStaticAtomTable && !gStaticAtomTableSealed) {
|
|
gStaticAtomTable = new StaticAtomTable();
|
|
}
|
|
|
|
for (uint32_t i = 0; i < aAtomCount; ++i) {
|
|
NS_ASSERTION(nsCRT::IsAscii((char16_t*)aAtoms[i].mStringBuffer->Data()),
|
|
"Static atoms must be ASCII!");
|
|
|
|
uint32_t stringLen =
|
|
aAtoms[i].mStringBuffer->StorageSize() / sizeof(char16_t) - 1;
|
|
|
|
uint32_t hash;
|
|
AtomTableEntry* he =
|
|
GetAtomHashEntry((char16_t*)aAtoms[i].mStringBuffer->Data(),
|
|
stringLen, &hash);
|
|
|
|
AtomImpl* atom = he->mAtom;
|
|
if (atom) {
|
|
if (!atom->IsPermanent()) {
|
|
// We wanted to create a static atom but there is already a non-static
|
|
// atom there. So convert it to a non-refcounting permanent atom.
|
|
PromoteToPermanent(atom);
|
|
}
|
|
} else {
|
|
atom = new PermanentAtomImpl(aAtoms[i].mStringBuffer, stringLen, hash);
|
|
he->mAtom = atom;
|
|
}
|
|
*aAtoms[i].mAtom = atom;
|
|
|
|
if (!gStaticAtomTableSealed) {
|
|
StaticAtomEntry* entry =
|
|
gStaticAtomTable->PutEntry(nsDependentAtomString(atom));
|
|
entry->mAtom = atom;
|
|
}
|
|
}
|
|
return NS_OK;
|
|
}
|
|
|
|
already_AddRefed<nsIAtom>
|
|
NS_NewAtom(const char* aUTF8String)
|
|
{
|
|
return NS_NewAtom(nsDependentCString(aUTF8String));
|
|
}
|
|
|
|
already_AddRefed<nsIAtom>
|
|
NS_NewAtom(const nsACString& aUTF8String)
|
|
{
|
|
uint32_t hash;
|
|
AtomTableEntry* he = GetAtomHashEntry(aUTF8String.Data(),
|
|
aUTF8String.Length(),
|
|
&hash);
|
|
|
|
if (he->mAtom) {
|
|
nsCOMPtr<nsIAtom> atom = he->mAtom;
|
|
|
|
return atom.forget();
|
|
}
|
|
|
|
// This results in an extra addref/release of the nsStringBuffer.
|
|
// Unfortunately there doesn't seem to be any APIs to avoid that.
|
|
// Actually, now there is, sort of: ForgetSharedBuffer.
|
|
nsString str;
|
|
CopyUTF8toUTF16(aUTF8String, str);
|
|
RefPtr<AtomImpl> atom = new AtomImpl(str, hash);
|
|
|
|
he->mAtom = atom;
|
|
|
|
return atom.forget();
|
|
}
|
|
|
|
already_AddRefed<nsIAtom>
|
|
NS_NewAtom(const char16_t* aUTF16String)
|
|
{
|
|
return NS_NewAtom(nsDependentString(aUTF16String));
|
|
}
|
|
|
|
// Equivalent to current NS_Atomize.
|
|
// Left as such for legacy callers in our older 45-era codebase.
|
|
already_AddRefed<nsIAtom>
|
|
NS_NewAtom(const nsAString& aUTF16String)
|
|
{
|
|
uint32_t hash;
|
|
AtomTableEntry* he = GetAtomHashEntry(aUTF16String.Data(),
|
|
aUTF16String.Length(),
|
|
&hash);
|
|
|
|
if (he->mAtom) {
|
|
nsCOMPtr<nsIAtom> atom = he->mAtom;
|
|
|
|
return atom.forget();
|
|
}
|
|
|
|
RefPtr<AtomImpl> atom = new AtomImpl(aUTF16String, hash);
|
|
he->mAtom = atom;
|
|
|
|
return atom.forget();
|
|
}
|
|
|
|
// From bug 1351303, modified for Mozilla 45.
|
|
already_AddRefed<nsIAtom>
|
|
NS_AtomizeMainThread(const nsAString& aUTF16String)
|
|
{
|
|
#if(0)
|
|
MOZ_ASSERT(NS_IsMainThread());
|
|
nsCOMPtr<nsIAtom> retVal;
|
|
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];
|
|
|
|
if (atom && atom->GetUTF16String()) { // wallpaper
|
|
// This isn't ideal, but covers for the collision case, I guess.
|
|
// The atom names shouldn't be very long in any event.
|
|
uint32_t length = atom->GetLength();
|
|
if (length == key.mLength &&
|
|
(memcmp(atom->GetUTF16String(),
|
|
key.mUTF16String, length * sizeof(char16_t)) == 0)) {
|
|
retVal = atom;
|
|
return retVal.forget();
|
|
}
|
|
}
|
|
|
|
// Inline relevant parts of GetAtomHashEntry.
|
|
AtomTableEntry* he = static_cast<AtomTableEntry*>(gAtomTable->Add(&key));
|
|
if (he->mAtom) {
|
|
retVal = he->mAtom;
|
|
} else {
|
|
RefPtr<AtomImpl> atom = new AtomImpl(aUTF16String, hash);
|
|
he->mAtom = atom;
|
|
retVal = he->mAtom; // XXX?
|
|
}
|
|
|
|
sRecentlyUsedMainThreadAtoms[index] = retVal;
|
|
return retVal.forget();
|
|
#else
|
|
return NS_NewAtom(aUTF16String);
|
|
#endif
|
|
}
|
|
|
|
nsIAtom*
|
|
NS_NewPermanentAtom(const nsAString& aUTF16String)
|
|
{
|
|
uint32_t hash;
|
|
AtomTableEntry* he = GetAtomHashEntry(aUTF16String.Data(),
|
|
aUTF16String.Length(),
|
|
&hash);
|
|
|
|
AtomImpl* atom = he->mAtom;
|
|
if (atom) {
|
|
if (!atom->IsPermanent()) {
|
|
PromoteToPermanent(atom);
|
|
}
|
|
} else {
|
|
atom = new PermanentAtomImpl(aUTF16String, hash);
|
|
he->mAtom = atom;
|
|
}
|
|
|
|
// No need to addref since permanent atoms aren't refcounted anyway
|
|
return atom;
|
|
}
|
|
|
|
nsrefcnt
|
|
NS_GetNumberOfAtoms(void)
|
|
{
|
|
MOZ_ASSERT(gAtomTable);
|
|
return gAtomTable->EntryCount();
|
|
}
|
|
|
|
nsIAtom*
|
|
NS_GetStaticAtom(const nsAString& aUTF16String)
|
|
{
|
|
NS_PRECONDITION(gStaticAtomTable, "Static atom table not created yet.");
|
|
NS_PRECONDITION(gStaticAtomTableSealed, "Static atom table not sealed yet.");
|
|
StaticAtomEntry* entry = gStaticAtomTable->GetEntry(aUTF16String);
|
|
return entry ? entry->mAtom : nullptr;
|
|
}
|
|
|
|
void
|
|
NS_SealStaticAtomTable()
|
|
{
|
|
gStaticAtomTableSealed = true;
|
|
}
|