JavaScriptCore-576.tar.gz

[apple/javascriptcore.git] / runtime / UStringImpl.cpp

diff --git a/runtime/UStringImpl.cpp b/runtime/UStringImpl.cpp
new file mode 100644 (file)
index 0000000..4b0d1c9
--- /dev/null
+++ b/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();
+        }
+    }
+}
+
+}