runtime/UStringImpl.cpp

   1 /*
   2  * Copyright (C) 2009 Apple Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
  14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
  17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #include "config.h"
  27 #include "UStringImpl.h"
  28
  29 #include "Identifier.h"
  30 #include "UString.h"
  31 #include <wtf/unicode/UTF8.h>
  32
  33 using namespace WTF::Unicode;
  34 using namespace std;
  35
  36 namespace JSC {
  37
  38 SharedUChar* UStringImpl::baseSharedBuffer()
  39 {
  40     ASSERT((bufferOwnership() == BufferShared)
  41         || ((bufferOwnership() == BufferOwned) && !m_dataBuffer.asPtr<void*>()));
  42
  43     if (bufferOwnership() != BufferShared)
  44         m_dataBuffer = UntypedPtrAndBitfield(SharedUChar::create(new OwnFastMallocPtr<UChar>(m_data)).releaseRef(), BufferShared);
  45
  46     return m_dataBuffer.asPtr<SharedUChar*>();
  47 }
  48
  49 SharedUChar* UStringImpl::sharedBuffer()
  50 {
  51     if (m_length < s_minLengthToShare)
  52         return 0;
  53     ASSERT(!isStatic());
  54
  55     UStringImpl* owner = bufferOwnerString();
  56     if (owner->bufferOwnership() == BufferInternal)
  57         return 0;
  58
  59     return owner->baseSharedBuffer();
  60 }
  61
  62 UStringImpl::~UStringImpl()
  63 {
  64     ASSERT(!isStatic());
  65     checkConsistency();
  66
  67     if (isIdentifier())
  68         Identifier::remove(this);
  69
  70     if (bufferOwnership() != BufferInternal) {
  71         if (bufferOwnership() == BufferOwned)
  72             fastFree(m_data);
  73         else if (bufferOwnership() == BufferSubstring)
  74             m_dataBuffer.asPtr<UStringImpl*>()->deref();
  75         else {
  76             ASSERT(bufferOwnership() == BufferShared);
  77             m_dataBuffer.asPtr<SharedUChar*>()->deref();
  78         }
  79     }
  80 }
  81
  82 }