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

1 files changed, 67 insertions, 0 deletions

diff --git a/Source/JavaScriptCore/runtime/RegExpCache.h b/Source/JavaScriptCore/runtime/RegExpCache.h
new file mode 100644
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+++ b/Source/JavaScriptCore/runtime/RegExpCache.h
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+/*
+ * Copyright (C) 2010 University of Szeged
+ * Copyright (C) 2010 Renata Hodovan (hodovan@inf.u-szeged.hu)
+ * 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 UNIVERSITY OF SZEGED ``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 UNIVERSITY OF SZEGED 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 "RegExp.h"
+#include "RegExpKey.h"
+#include "Strong.h"
+#include "UString.h"
+#include "Weak.h"
+#include <wtf/FixedArray.h>
+#include <wtf/HashMap.h>
+
+#ifndef RegExpCache_h
+#define RegExpCache_h
+
+namespace JSC {
+
+class RegExpCache : private WeakHandleOwner {
+friend class RegExp;
+typedef HashMap<RegExpKey, Weak<RegExp> > RegExpCacheMap;
+
+public:
+    RegExpCache(JSGlobalData* globalData);
+    void invalidateCode();
+
+private:
+    
+    static const unsigned maxStrongCacheablePatternLength = 256;
+
+    static const int maxStrongCacheableEntries = 32;
+
+    virtual void finalize(Handle<Unknown>, void* context);
+
+    RegExp* lookupOrCreate(const UString& patternString, RegExpFlags);
+    void addToStrongCache(RegExp*);
+    RegExpCacheMap m_weakCache; // Holds all regular expressions currently live.
+    int m_nextEntryInStrongCache;
+    WTF::FixedArray<Strong<RegExp>, maxStrongCacheableEntries> m_strongCache; // Holds a select few regular expressions that have compiled and executed
+    JSGlobalData* m_globalData;
+};
+
+} // namespace JSC
+
+#endif // RegExpCache_h