mirror of
https://github.com/rn10950/RetroZilla.git
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628 lines
16 KiB
C++
628 lines
16 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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// vim:cindent:ts=2:et:sw=2:
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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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 "nsReadableUtils.h"
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#include "nsCRT.h"
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#include "pldhash.h"
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#include "prenv.h"
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#include "nsVoidArray.h"
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#define PL_ARENA_CONST_ALIGN_MASK 3
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#include "plarena.h"
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class nsStaticAtomWrapper;
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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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* If |gAtomTable.ops| is 0, then the table is uninitialized.
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*/
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static PLDHashTable gAtomTable;
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// this is where we keep the nsStaticAtomWrapper objects
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static PLArenaPool* gStaticAtomArena = 0;
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class nsStaticAtomWrapper : public nsIAtom
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{
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public:
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nsStaticAtomWrapper(const nsStaticAtom* aAtom) :
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mStaticAtom(aAtom)
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{
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MOZ_COUNT_CTOR(nsStaticAtomWrapper);
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}
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~nsStaticAtomWrapper() { // no subclasses -> not virtual
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// this is arena allocated and won't be called except in debug
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// builds. If this function ever does anything non-debug, be sure
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// to get rid of the ifdefs in AtomTableClearEntry!
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MOZ_COUNT_DTOR(nsStaticAtomWrapper);
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}
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NS_IMETHOD QueryInterface(REFNSIID aIID,
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void** aInstancePtr);
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NS_IMETHOD_(nsrefcnt) AddRef(void);
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NS_IMETHOD_(nsrefcnt) Release(void);
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NS_DECL_NSIATOM
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const nsStaticAtom* GetStaticAtom() {
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return mStaticAtom;
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}
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private:
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const nsStaticAtom* mStaticAtom;
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};
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// the atomtableentry can contain either an AtomImpl or a
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// nsStaticAtomWrapper, indicated by the first bit of PtrBits
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typedef unsigned long PtrBits;
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struct AtomTableEntry : public PLDHashEntryHdr {
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// mAtom & 0x1 means (mAtom & ~0x1) points to an nsStaticAtomWrapper
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// else it points to an nsAtomImpl
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PtrBits mAtom;
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inline PRBool IsStaticAtom() const {
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return (mAtom & 0x1) != 0;
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}
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inline void SetAtomImpl(AtomImpl* aAtom) {
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NS_ASSERTION(aAtom, "Setting null atom");
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mAtom = PtrBits(aAtom);
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}
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inline void SetStaticAtomWrapper(nsStaticAtomWrapper* aAtom) {
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NS_ASSERTION(aAtom, "Setting null atom");
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NS_ASSERTION((PtrBits(aAtom) & ~0x1) == PtrBits(aAtom),
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"Pointers must align or this is broken");
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mAtom = PtrBits(aAtom) | 0x1;
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}
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inline void ClearAtom() {
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mAtom = nsnull;
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}
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inline PRBool HasValue() const {
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return (mAtom & ~0x1) != 0;
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}
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// these accessors assume that you already know the type
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inline AtomImpl *GetAtomImpl() const {
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NS_ASSERTION(!IsStaticAtom(), "This is a static atom, not an AtomImpl");
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return (AtomImpl*) (mAtom & ~0x1);
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}
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inline nsStaticAtomWrapper *GetStaticAtomWrapper() const {
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NS_ASSERTION(IsStaticAtom(), "This is an AtomImpl, not a static atom");
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return (nsStaticAtomWrapper*) (mAtom & ~0x1);
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}
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inline const nsStaticAtom* GetStaticAtom() const {
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return GetStaticAtomWrapper()->GetStaticAtom();
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}
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// type-agnostic accessors
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// get the string buffer
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inline const char* get() const {
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return IsStaticAtom() ? GetStaticAtom()->mString : GetAtomImpl()->mString;
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}
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// get an addreffed nsIAtom - not using already_AddRef'ed atom
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// because the callers are not (and should not be) using nsCOMPtr
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inline nsIAtom* GetAtom() const {
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nsIAtom* result;
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if (IsStaticAtom())
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result = GetStaticAtomWrapper();
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else {
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result = GetAtomImpl();
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NS_ADDREF(result);
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}
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return result;
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}
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};
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PR_STATIC_CALLBACK(const void *)
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AtomTableGetKey(PLDHashTable *table, PLDHashEntryHdr *entry)
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{
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AtomTableEntry *he = NS_STATIC_CAST(AtomTableEntry*, entry);
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NS_ASSERTION(he->HasValue(), "Empty atom. how did that happen?");
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return he->get();
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}
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PR_STATIC_CALLBACK(PRBool)
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AtomTableMatchKey(PLDHashTable *table,
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const PLDHashEntryHdr *entry,
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const void *key)
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{
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const AtomTableEntry *he = NS_STATIC_CAST(const AtomTableEntry*, entry);
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const char* keyStr = NS_STATIC_CAST(const char*, key);
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return nsCRT::strcmp(keyStr, he->get()) == 0;
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}
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PR_STATIC_CALLBACK(void)
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AtomTableClearEntry(PLDHashTable *table, PLDHashEntryHdr *entry)
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{
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AtomTableEntry *he = NS_STATIC_CAST(AtomTableEntry*, entry);
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he->keyHash = 0;
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if (!he->IsStaticAtom()) {
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AtomImpl *atom = he->GetAtomImpl();
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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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if (atom->IsPermanent())
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delete NS_STATIC_CAST(PermanentAtomImpl*, atom);
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}
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else {
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he->GetStaticAtomWrapper()->~nsStaticAtomWrapper();
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}
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he->ClearAtom();
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}
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static const PLDHashTableOps AtomTableOps = {
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PL_DHashAllocTable,
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PL_DHashFreeTable,
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AtomTableGetKey,
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PL_DHashStringKey,
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AtomTableMatchKey,
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PL_DHashMoveEntryStub,
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AtomTableClearEntry,
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PL_DHashFinalizeStub,
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NULL
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};
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#ifdef DEBUG
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PR_STATIC_CALLBACK(PLDHashOperator)
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DumpAtomLeaks(PLDHashTable *table, PLDHashEntryHdr *he,
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PRUint32 index, void *arg)
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{
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AtomTableEntry *entry = NS_STATIC_CAST(AtomTableEntry*, he);
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if (entry->IsStaticAtom())
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return PL_DHASH_NEXT;
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AtomImpl* atom = entry->GetAtomImpl();
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if (!atom->IsPermanent()) {
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++*NS_STATIC_CAST(PRUint32*, arg);
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const char *str;
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atom->GetUTF8String(&str);
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fputs(str, stdout);
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fputs("\n", stdout);
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}
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return PL_DHASH_NEXT;
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}
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#endif
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static inline
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void 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 NS_PurgeAtomTable()
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{
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if (gAtomTable.ops) {
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#ifdef DEBUG
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if (PR_GetEnv("MOZ_DUMP_ATOM_LEAKS")) {
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PRUint32 leaked = 0;
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printf("*** %d atoms still exist (including permanent):\n",
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gAtomTable.entryCount);
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PL_DHashTableEnumerate(&gAtomTable, DumpAtomLeaks, &leaked);
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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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PL_DHashTableFinish(&gAtomTable);
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gAtomTable.entryCount = 0;
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gAtomTable.ops = nsnull;
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if (gStaticAtomArena) {
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PL_FinishArenaPool(gStaticAtomArena);
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delete gStaticAtomArena;
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gStaticAtomArena = nsnull;
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}
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}
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}
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AtomImpl::AtomImpl()
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{
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}
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AtomImpl::~AtomImpl()
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{
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NS_PRECONDITION(gAtomTable.ops, "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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PL_DHashTableOperate(&gAtomTable, mString, PL_DHASH_REMOVE);
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if (gAtomTable.entryCount == 0) {
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PL_DHashTableFinish(&gAtomTable);
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NS_ASSERTION(gAtomTable.entryCount == 0,
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"PL_DHashTableFinish changed the entry count");
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}
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}
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}
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NS_IMPL_THREADSAFE_ISUPPORTS1(AtomImpl, nsIAtom)
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PermanentAtomImpl::PermanentAtomImpl()
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: AtomImpl()
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{
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}
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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_(nsrefcnt) PermanentAtomImpl::AddRef()
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{
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return 2;
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}
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NS_IMETHODIMP_(nsrefcnt) PermanentAtomImpl::Release()
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{
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return 1;
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}
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/* virtual */ PRBool
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AtomImpl::IsPermanent()
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{
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return PR_FALSE;
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}
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/* virtual */ PRBool
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PermanentAtomImpl::IsPermanent()
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{
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return PR_TRUE;
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}
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void* AtomImpl::operator new ( size_t size, const nsACString& aString ) CPP_THROW_NEW
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{
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/*
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Note: since the |size| will initially also include the |PRUnichar| member
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|mString|, our size calculation will give us one character too many.
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We use that extra character for a zero-terminator.
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Note: this construction is not guaranteed to be possible by the C++
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compiler. A more reliable scheme is used by |nsShared[C]String|s, see
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http://lxr.mozilla.org/seamonkey/source/xpcom/ds/nsSharedString.h#174
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*/
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size += aString.Length() * sizeof(char);
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AtomImpl* ii = NS_STATIC_CAST(AtomImpl*, ::operator new(size));
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char* toBegin = &ii->mString[0];
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nsACString::const_iterator fromBegin, fromEnd;
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*copy_string(aString.BeginReading(fromBegin), aString.EndReading(fromEnd), toBegin) = '\0';
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return ii;
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}
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void* PermanentAtomImpl::operator new ( size_t size, AtomImpl* aAtom ) CPP_THROW_NEW {
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NS_ASSERTION(!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::ToString(nsAString& aBuf)
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{
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CopyUTF8toUTF16(nsDependentCString(mString), 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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aBuf.Assign(mString);
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return NS_OK;
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}
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NS_IMETHODIMP
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AtomImpl::GetUTF8String(const char **aResult)
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{
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NS_PRECONDITION(aResult, "null out param");
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*aResult = mString;
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return NS_OK;
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}
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NS_IMETHODIMP
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AtomImpl::EqualsUTF8(const nsACString& aString, PRBool* aResult)
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{
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*aResult = aString.Equals(mString);
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return NS_OK;
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}
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NS_IMETHODIMP
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AtomImpl::Equals(const nsAString& aString, PRBool* aResult)
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{
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*aResult = NS_ConvertUTF16toUTF8(aString).Equals(mString);
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return NS_OK;
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}
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//----------------------------------------------------------------------
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// wrapper class for the nsStaticAtom struct
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NS_IMETHODIMP_(nsrefcnt)
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nsStaticAtomWrapper::AddRef()
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{
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return 2;
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}
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NS_IMETHODIMP_(nsrefcnt)
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nsStaticAtomWrapper::Release()
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{
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return 1;
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}
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NS_IMPL_QUERY_INTERFACE1(nsStaticAtomWrapper, nsIAtom)
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NS_IMETHODIMP
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nsStaticAtomWrapper::GetUTF8String(const char** aResult)
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{
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*aResult = mStaticAtom->mString;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsStaticAtomWrapper::ToString(nsAString& aBuf)
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{
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// static should always be always ASCII, to allow tools like gperf
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// to generate the tables, and to avoid unnecessary conversion
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NS_ASSERTION(nsCRT::IsAscii(mStaticAtom->mString),
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"Data loss - atom should be ASCII");
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CopyASCIItoUCS2(nsDependentCString(mStaticAtom->mString), aBuf);
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return NS_OK;
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}
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NS_IMETHODIMP
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nsStaticAtomWrapper::ToUTF8String(nsACString& aBuf)
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{
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aBuf.Assign(mStaticAtom->mString);
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return NS_OK;
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}
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NS_IMETHODIMP
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nsStaticAtomWrapper::EqualsUTF8(const nsACString& aString, PRBool* aResult)
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{
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*aResult = aString.Equals(mStaticAtom->mString);
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return NS_OK;
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}
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NS_IMETHODIMP
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nsStaticAtomWrapper::Equals(const nsAString& aString, PRBool* aResult)
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{
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*aResult = NS_ConvertUCS2toUTF8(aString).Equals(mStaticAtom->mString);
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return NS_OK;
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}
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//----------------------------------------------------------------------
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NS_COM nsIAtom* NS_NewAtom(const char* isolatin1)
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{
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return NS_NewAtom(nsDependentCString(isolatin1));
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}
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NS_COM nsIAtom* NS_NewPermanentAtom(const char* isolatin1)
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{
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return NS_NewPermanentAtom(NS_ConvertASCIItoUCS2(isolatin1));
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}
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static nsStaticAtomWrapper*
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WrapStaticAtom(const nsStaticAtom* aAtom)
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{
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if (!gStaticAtomArena) {
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gStaticAtomArena = new PLArenaPool;
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if (!gStaticAtomArena)
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return nsnull;
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PL_INIT_ARENA_POOL(gStaticAtomArena, "nsStaticAtomArena", 4096);
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}
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void* mem;
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PL_ARENA_ALLOCATE(mem, gStaticAtomArena, sizeof(nsStaticAtom));
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nsStaticAtomWrapper* wrapper =
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new (mem) nsStaticAtomWrapper(aAtom);
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return wrapper;
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}
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static AtomTableEntry* GetAtomHashEntry(const char* aString)
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{
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if (!gAtomTable.ops &&
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!PL_DHashTableInit(&gAtomTable, &AtomTableOps, 0,
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sizeof(AtomTableEntry), 2048)) {
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gAtomTable.ops = nsnull;
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return nsnull;
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}
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return NS_STATIC_CAST(AtomTableEntry*,
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PL_DHashTableOperate(&gAtomTable,
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aString,
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PL_DHASH_ADD));
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}
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NS_COM nsresult
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NS_RegisterStaticAtoms(const nsStaticAtom* aAtoms, PRUint32 aAtomCount)
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{
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// this does two things:
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// 1) wraps each static atom in a wrapper, if necessary
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// 2) initializes the address pointed to by each mAtom slot
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for (PRUint32 i=0; i<aAtomCount; i++) {
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NS_ASSERTION(nsCRT::IsAscii(aAtoms[i].mString),
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"Static atoms must be ASCII!");
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AtomTableEntry *he =
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GetAtomHashEntry(aAtoms[i].mString);
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|
if (he->HasValue() && aAtoms[i].mAtom) {
|
|
// there already is an atom with this name in the table.. but we
|
|
// still have to update mAtom
|
|
if (!he->IsStaticAtom() && !he->GetAtomImpl()->IsPermanent()) {
|
|
// since we wanted to create a static atom but there is
|
|
// already one there, we convert it to a non-refcounting
|
|
// permanent atom
|
|
PromoteToPermanent(he->GetAtomImpl());
|
|
}
|
|
|
|
// and now, if the consumer wants to remember this value in a
|
|
// slot, we do so
|
|
if (aAtoms[i].mAtom)
|
|
*aAtoms[i].mAtom = he->GetAtom();
|
|
}
|
|
|
|
else {
|
|
nsStaticAtomWrapper* atom = WrapStaticAtom(&aAtoms[i]);
|
|
NS_ASSERTION(atom, "Failed to wrap static atom");
|
|
|
|
// but even if atom is null, no real difference in code..
|
|
he->SetStaticAtomWrapper(atom);
|
|
if (aAtoms[i].mAtom)
|
|
*aAtoms[i].mAtom = atom;
|
|
}
|
|
}
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_COM nsIAtom* NS_NewAtom( const nsAString& aString )
|
|
{
|
|
NS_ConvertUCS2toUTF8 utf8String(aString);
|
|
|
|
return NS_NewAtom(utf8String);
|
|
}
|
|
|
|
NS_COM
|
|
nsIAtom*
|
|
NS_NewAtom( const nsACString& aString )
|
|
{
|
|
AtomTableEntry *he = GetAtomHashEntry(PromiseFlatCString(aString).get());
|
|
|
|
if (he->HasValue())
|
|
return he->GetAtom();
|
|
|
|
AtomImpl* atom = new (aString) AtomImpl();
|
|
he->SetAtomImpl(atom);
|
|
if (!atom) {
|
|
PL_DHashTableRawRemove(&gAtomTable, he);
|
|
return nsnull;
|
|
}
|
|
|
|
NS_ADDREF(atom);
|
|
return atom;
|
|
}
|
|
|
|
NS_COM nsIAtom* NS_NewPermanentAtom( const nsAString& aString )
|
|
{
|
|
return NS_NewPermanentAtom(NS_ConvertUCS2toUTF8(aString));
|
|
}
|
|
|
|
NS_COM
|
|
nsIAtom* NS_NewPermanentAtom( const nsACString& aString )
|
|
{
|
|
AtomTableEntry *he = GetAtomHashEntry(PromiseFlatCString(aString).get());
|
|
|
|
if (he->HasValue() && he->IsStaticAtom())
|
|
return he->GetStaticAtomWrapper();
|
|
|
|
// either there is no atom and we'll create an AtomImpl,
|
|
// or there is an existing AtomImpl
|
|
AtomImpl* atom = he->GetAtomImpl();
|
|
|
|
if (atom) {
|
|
// ensure that it's permanent
|
|
if (!atom->IsPermanent()) {
|
|
PromoteToPermanent(atom);
|
|
}
|
|
} else {
|
|
// otherwise, make a new atom
|
|
atom = new (aString) PermanentAtomImpl();
|
|
he->SetAtomImpl(atom);
|
|
if ( !atom ) {
|
|
PL_DHashTableRawRemove(&gAtomTable, he);
|
|
return nsnull;
|
|
}
|
|
}
|
|
|
|
NS_ADDREF(atom);
|
|
return atom;
|
|
}
|
|
|
|
NS_COM nsIAtom* NS_NewAtom( const PRUnichar* str )
|
|
{
|
|
return NS_NewAtom(NS_ConvertUCS2toUTF8(str));
|
|
}
|
|
|
|
NS_COM nsIAtom* NS_NewPermanentAtom( const PRUnichar* str )
|
|
{
|
|
return NS_NewPermanentAtom(nsDependentString(str));
|
|
}
|
|
|
|
NS_COM nsrefcnt NS_GetNumberOfAtoms(void)
|
|
{
|
|
return gAtomTable.entryCount;
|
|
}
|
|
|