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