Imported WebKit commit 2ea9d364d0f6efa8fa64acf19f451504c59be0e4 (http://svn.webkit.org/repository/webkit/trunk@104285)

1 files changed, 85 insertions, 0 deletions

diff --git a/Source/JavaScriptCore/runtime/SmallStrings.h b/Source/JavaScriptCore/runtime/SmallStrings.h
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+++ b/Source/JavaScriptCore/runtime/SmallStrings.h
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+/*
+ * Copyright (C) 2008, 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.
+ */
+
+#ifndef SmallStrings_h
+#define SmallStrings_h
+
+#include "UString.h"
+#include <wtf/FixedArray.h>
+#include <wtf/OwnPtr.h>
+
+namespace JSC {
+
+    class HeapRootVisitor;
+    class JSGlobalData;
+    class JSString;
+    class SmallStringsStorage;
+    class SlotVisitor;
+
+    static const unsigned maxSingleCharacterString = 0xFF;
+
+    class SmallStrings {
+        WTF_MAKE_NONCOPYABLE(SmallStrings);
+    public:
+        SmallStrings();
+        ~SmallStrings();
+
+        JSString* emptyString(JSGlobalData* globalData)
+        {
+            if (!m_emptyString)
+                createEmptyString(globalData);
+            return m_emptyString;
+        }
+
+        JSString* singleCharacterString(JSGlobalData* globalData, unsigned char character)
+        {
+            if (!m_singleCharacterStrings[character])
+                createSingleCharacterString(globalData, character);
+            return m_singleCharacterStrings[character];
+        }
+
+        StringImpl* singleCharacterStringRep(unsigned char character);
+
+        void finalizeSmallStrings();
+        void clear();
+
+        unsigned count() const;
+
+        JSString** singleCharacterStrings() { return &m_singleCharacterStrings[0]; }
+
+    private:
+        static const unsigned singleCharacterStringCount = maxSingleCharacterString + 1;
+
+        void createEmptyString(JSGlobalData*);
+        void createSingleCharacterString(JSGlobalData*, unsigned char);
+
+        JSString* m_emptyString;
+        JSString* m_singleCharacterStrings[singleCharacterStringCount];
+        OwnPtr<SmallStringsStorage> m_storage;
+    };
+
+} // namespace JSC
+
+#endif // SmallStrings_h