webkitgtk-2.10.2webkitgtk-2.10.2

1 files changed, 109 insertions, 0 deletions

diff --git a/Source/JavaScriptCore/API/OpaqueJSString.cpp b/Source/JavaScriptCore/API/OpaqueJSString.cpp
new file mode 100644
index 000000000..07a79ad99
--- /dev/null
+++ b/Source/JavaScriptCore/API/OpaqueJSString.cpp
@@ -0,0 +1,109 @@
+/*
+ * Copyright (C) 2008 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 "OpaqueJSString.h"
+
+#include "CallFrame.h"
+#include "Identifier.h"
+#include "IdentifierInlines.h"
+#include "JSGlobalObject.h"
+#include <wtf/text/StringView.h>
+
+using namespace JSC;
+
+RefPtr<OpaqueJSString> OpaqueJSString::create(const String& string)
+{
+    if (string.isNull())
+        return nullptr;
+
+    return adoptRef(new OpaqueJSString(string));
+}
+
+OpaqueJSString::~OpaqueJSString()
+{
+    // m_characters is put in a local here to avoid an extra atomic load.
+    UChar* characters = m_characters;
+    if (!characters)
+        return;
+
+    if (!m_string.is8Bit() && m_string.characters16() == characters)
+        return;
+
+    fastFree(characters);
+}
+
+String OpaqueJSString::string() const
+{
+    // Return a copy of the wrapped string, because the caller may make it an Identifier.
+    return m_string.isolatedCopy();
+}
+
+Identifier OpaqueJSString::identifier(VM* vm) const
+{
+    if (m_string.isNull())
+        return Identifier();
+
+    if (m_string.isEmpty())
+        return Identifier(Identifier::EmptyIdentifier);
+
+    if (m_string.is8Bit())
+        return Identifier::fromString(vm, m_string.characters8(), m_string.length());
+
+    return Identifier::fromString(vm, m_string.characters16(), m_string.length());
+}
+
+const UChar* OpaqueJSString::characters()
+{
+    // m_characters is put in a local here to avoid an extra atomic load.
+    UChar* characters = m_characters;
+    if (characters)
+        return characters;
+
+    if (m_string.isNull())
+        return nullptr;
+
+    unsigned length = m_string.length();
+    UChar* newCharacters = static_cast<UChar*>(fastMalloc(length * sizeof(UChar)));
+    StringView(m_string).getCharactersWithUpconvert(newCharacters);
+
+    if (!m_characters.compare_exchange_strong(characters, newCharacters)) {
+        fastFree(newCharacters);
+        return characters;
+    }
+
+    return newCharacters;
+}
+
+bool OpaqueJSString::equal(const OpaqueJSString* a, const OpaqueJSString* b)
+{
+    if (a == b)
+        return true;
+
+    if (!a || !b)
+        return false;
+
+    return a->m_string == b->m_string;
+}