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Diffstat (limited to 'JavaScriptCore/runtime/UStringImpl.cpp')
-rw-r--r-- | JavaScriptCore/runtime/UStringImpl.cpp | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/JavaScriptCore/runtime/UStringImpl.cpp b/JavaScriptCore/runtime/UStringImpl.cpp new file mode 100644 index 0000000..4b0d1c9 --- /dev/null +++ b/JavaScriptCore/runtime/UStringImpl.cpp @@ -0,0 +1,82 @@ +/* + * Copyright (C) 2009 Apple Inc. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY + * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR + * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, + * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, + * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR + * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY + * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include "config.h" +#include "UStringImpl.h" + +#include "Identifier.h" +#include "UString.h" +#include <wtf/unicode/UTF8.h> + +using namespace WTF::Unicode; +using namespace std; + +namespace JSC { + +SharedUChar* UStringImpl::baseSharedBuffer() +{ + ASSERT((bufferOwnership() == BufferShared) + || ((bufferOwnership() == BufferOwned) && !m_dataBuffer.asPtr<void*>())); + + if (bufferOwnership() != BufferShared) + m_dataBuffer = UntypedPtrAndBitfield(SharedUChar::create(new OwnFastMallocPtr<UChar>(m_data)).releaseRef(), BufferShared); + + return m_dataBuffer.asPtr<SharedUChar*>(); +} + +SharedUChar* UStringImpl::sharedBuffer() +{ + if (m_length < s_minLengthToShare) + return 0; + ASSERT(!isStatic()); + + UStringImpl* owner = bufferOwnerString(); + if (owner->bufferOwnership() == BufferInternal) + return 0; + + return owner->baseSharedBuffer(); +} + +UStringImpl::~UStringImpl() +{ + ASSERT(!isStatic()); + checkConsistency(); + + if (isIdentifier()) + Identifier::remove(this); + + if (bufferOwnership() != BufferInternal) { + if (bufferOwnership() == BufferOwned) + fastFree(m_data); + else if (bufferOwnership() == BufferSubstring) + m_dataBuffer.asPtr<UStringImpl*>()->deref(); + else { + ASSERT(bufferOwnership() == BufferShared); + m_dataBuffer.asPtr<SharedUChar*>()->deref(); + } + } +} + +} |