mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
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317 lines
9.4 KiB
C++
317 lines
9.4 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim:set ts=2 sw=2 sts=2 et cindent: */
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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.
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*
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* The Initial Developer of the Original Code is IBM Corporation.
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* Portions created by IBM Corporation are Copyright (C) 2003
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* IBM Corporation. All Rights Reserved.
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*
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* Contributor(s):
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* Darin Fisher <darin@meer.net>
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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 the GNU General Public License Version 2 or later (the "GPL"), or
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* 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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#ifdef DEBUG
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#define ENABLE_STRING_STATS
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#endif
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#ifdef ENABLE_STRING_STATS
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#include <stdio.h>
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#endif
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#include <stdlib.h>
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#include "nsSubstring.h"
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#include "nsString.h"
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#include "nsStringBuffer.h"
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#include "nsDependentString.h"
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#include "nsMemory.h"
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#include "pratom.h"
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#include "prprf.h"
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// ---------------------------------------------------------------------------
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static PRUnichar gNullChar = 0;
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char* nsCharTraits<char> ::sEmptyBuffer = (char*) &gNullChar;
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PRUnichar* nsCharTraits<PRUnichar>::sEmptyBuffer = &gNullChar;
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// ---------------------------------------------------------------------------
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#ifdef ENABLE_STRING_STATS
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class nsStringStats
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{
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public:
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nsStringStats()
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: mAllocCount(0), mReallocCount(0), mFreeCount(0), mShareCount(0) {}
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~nsStringStats()
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{
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// this is a hack to suppress duplicate string stats printing
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// in seamonkey as a result of the string code being linked
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// into seamonkey and libxpcom! :-(
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if (!mAllocCount && !mAdoptCount)
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return;
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printf("nsStringStats\n");
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printf(" => mAllocCount: % 10d\n", mAllocCount);
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printf(" => mReallocCount: % 10d\n", mReallocCount);
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printf(" => mFreeCount: % 10d", mFreeCount);
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if (mAllocCount > mFreeCount)
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printf(" -- LEAKED %d !!!\n", mAllocCount - mFreeCount);
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else
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printf("\n");
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printf(" => mShareCount: % 10d\n", mShareCount);
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printf(" => mAdoptCount: % 10d\n", mAdoptCount);
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printf(" => mAdoptFreeCount: % 10d", mAdoptFreeCount);
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if (mAdoptCount > mAdoptFreeCount)
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printf(" -- LEAKED %d !!!\n", mAdoptCount - mAdoptFreeCount);
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else
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printf("\n");
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}
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PRInt32 mAllocCount;
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PRInt32 mReallocCount;
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PRInt32 mFreeCount;
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PRInt32 mShareCount;
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PRInt32 mAdoptCount;
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PRInt32 mAdoptFreeCount;
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};
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static nsStringStats gStringStats;
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#define STRING_STAT_INCREMENT(_s) PR_AtomicIncrement(&gStringStats.m ## _s ## Count)
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#else
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#define STRING_STAT_INCREMENT(_s)
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#endif
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// ---------------------------------------------------------------------------
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inline void
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ReleaseData( void* data, PRUint32 flags )
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{
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if (flags & nsSubstring::F_SHARED)
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{
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nsStringBuffer::FromData(data)->Release();
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}
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else if (flags & nsSubstring::F_OWNED)
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{
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nsMemory::Free(data);
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STRING_STAT_INCREMENT(AdoptFree);
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#ifdef NS_BUILD_REFCNT_LOGGING
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// Treat this as destruction of a "StringAdopt" object for leak
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// tracking purposes.
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NS_LogDtor(data, "StringAdopt", 1);
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#endif // NS_BUILD_REFCNT_LOGGING
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}
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// otherwise, nothing to do.
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}
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// ---------------------------------------------------------------------------
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// XXX or we could make nsStringBuffer be a friend of nsTAString
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class nsAStringAccessor : public nsAString
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{
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private:
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nsAStringAccessor(); // NOT IMPLEMENTED
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public:
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char_type *data() const { return mData; }
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size_type length() const { return mLength; }
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PRUint32 flags() const { return mFlags; }
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void set(char_type *data, size_type len, PRUint32 flags)
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{
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ReleaseData(mData, mFlags);
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mData = data;
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mLength = len;
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mFlags = flags;
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}
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};
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class nsACStringAccessor : public nsACString
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{
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private:
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nsACStringAccessor(); // NOT IMPLEMENTED
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public:
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char_type *data() const { return mData; }
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size_type length() const { return mLength; }
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PRUint32 flags() const { return mFlags; }
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void set(char_type *data, size_type len, PRUint32 flags)
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{
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ReleaseData(mData, mFlags);
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mData = data;
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mLength = len;
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mFlags = flags;
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}
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};
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// ---------------------------------------------------------------------------
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void
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nsStringBuffer::AddRef()
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{
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PR_AtomicIncrement(&mRefCount);
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STRING_STAT_INCREMENT(Share);
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NS_LOG_ADDREF(this, mRefCount, "nsStringBuffer", sizeof(*this));
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}
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void
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nsStringBuffer::Release()
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{
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PRInt32 count = PR_AtomicDecrement(&mRefCount);
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NS_LOG_RELEASE(this, count, "nsStringBuffer");
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if (count == 0)
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{
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STRING_STAT_INCREMENT(Free);
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free(this); // we were allocated with |malloc|
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}
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}
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/**
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* Alloc returns a pointer to a new string header with set capacity.
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*/
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nsStringBuffer*
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nsStringBuffer::Alloc(size_t size)
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{
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NS_ASSERTION(size != 0, "zero capacity allocation not allowed");
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nsStringBuffer *hdr =
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(nsStringBuffer *) malloc(sizeof(nsStringBuffer) + size);
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if (hdr)
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{
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STRING_STAT_INCREMENT(Alloc);
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hdr->mRefCount = 1;
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hdr->mStorageSize = size;
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NS_LOG_ADDREF(hdr, 1, "nsStringBuffer", sizeof(*hdr));
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}
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return hdr;
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}
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nsStringBuffer*
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nsStringBuffer::Realloc(nsStringBuffer* hdr, size_t size)
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{
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STRING_STAT_INCREMENT(Realloc);
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NS_ASSERTION(size != 0, "zero capacity allocation not allowed");
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// no point in trying to save ourselves if we hit this assertion
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NS_ASSERTION(!hdr->IsReadonly(), "|Realloc| attempted on readonly string");
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// Treat this as a release and addref for refcounting purposes, since we
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// just asserted that the refcound is 1. If we don't do that, refcount
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// logging will claim we've leaked all sorts of stuff.
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NS_LOG_RELEASE(hdr, 0, "nsStringBuffer");
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hdr = (nsStringBuffer*) realloc(hdr, sizeof(nsStringBuffer) + size);
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if (hdr) {
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NS_LOG_ADDREF(hdr, 1, "nsStringBuffer", sizeof(*hdr));
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hdr->mStorageSize = size;
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}
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return hdr;
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}
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nsStringBuffer*
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nsStringBuffer::FromString(const nsAString& str)
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{
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const nsAStringAccessor* accessor =
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static_cast<const nsAStringAccessor*>(&str);
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if (!(accessor->flags() & nsSubstring::F_SHARED))
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return nsnull;
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return FromData(accessor->data());
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}
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nsStringBuffer*
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nsStringBuffer::FromString(const nsACString& str)
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{
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const nsACStringAccessor* accessor =
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static_cast<const nsACStringAccessor*>(&str);
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if (!(accessor->flags() & nsCSubstring::F_SHARED))
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return nsnull;
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return FromData(accessor->data());
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}
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void
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nsStringBuffer::ToString(PRUint32 len, nsAString &str)
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{
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PRUnichar* data = static_cast<PRUnichar*>(Data());
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nsAStringAccessor* accessor = static_cast<nsAStringAccessor*>(&str);
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NS_ASSERTION(data[len] == PRUnichar(0), "data should be null terminated");
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// preserve class flags
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PRUint32 flags = accessor->flags();
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flags = (flags & 0xFFFF0000) | nsSubstring::F_SHARED | nsSubstring::F_TERMINATED;
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AddRef();
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accessor->set(data, len, flags);
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}
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void
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nsStringBuffer::ToString(PRUint32 len, nsACString &str)
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{
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char* data = static_cast<char*>(Data());
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nsACStringAccessor* accessor = static_cast<nsACStringAccessor*>(&str);
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NS_ASSERTION(data[len] == char(0), "data should be null terminated");
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// preserve class flags
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PRUint32 flags = accessor->flags();
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flags = (flags & 0xFFFF0000) | nsCSubstring::F_SHARED | nsCSubstring::F_TERMINATED;
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AddRef();
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accessor->set(data, len, flags);
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}
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// ---------------------------------------------------------------------------
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// define nsSubstring
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#include "string-template-def-unichar.h"
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#include "nsTSubstring.cpp"
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#include "string-template-undef.h"
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// define nsCSubstring
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#include "string-template-def-char.h"
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#include "nsTSubstring.cpp"
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#include "string-template-undef.h"
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// Check that internal and external strings have the same size.
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// See https://bugzilla.mozilla.org/show_bug.cgi?id=430581
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#include "prlog.h"
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#include "nsXPCOMStrings.h"
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PR_STATIC_ASSERT(sizeof(nsStringContainer_base) == sizeof(nsSubstring));
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