Merge WebKit at r75315: Initial merge by git.

Change-Id: I570314b346ce101c935ed22a626b48c2af266b84

1 files changed, 68 insertions, 0 deletions

diff --git a/Source/JavaScriptCore/runtime/RegExpCache.h b/Source/JavaScriptCore/runtime/RegExpCache.h
new file mode 100644
index 0000000..b5b637f
--- /dev/null
+++ b/Source/JavaScriptCore/runtime/RegExpCache.h
@@ -0,0 +1,68 @@
+/*
+ * 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 "UString.h"
+#include <wtf/FixedArray.h>
+#include <wtf/HashMap.h>
+
+#ifndef RegExpCache_h
+#define RegExpCache_h
+
+namespace JSC {
+
+class RegExpCache {
+
+typedef HashMap<RegExpKey, RefPtr<RegExp> > RegExpCacheMap;
+
+public:
+    PassRefPtr<RegExp> lookupOrCreate(const UString& patternString, const UString& flags);
+    PassRefPtr<RegExp> create(const UString& patternString, const UString& flags, RegExpCacheMap::iterator iterator);
+    RegExpCache(JSGlobalData* globalData);
+
+private:
+    static const unsigned maxCacheablePatternLength = 256;
+
+#if PLATFORM(IOS)
+    // The RegExpCache can currently hold onto multiple Mb of memory;
+    // as a short-term fix some embedded platforms may wish to reduce the cache size.
+    static const int maxCacheableEntries = 32;
+#else
+    static const int maxCacheableEntries = 256;
+#endif
+
+    FixedArray<RegExpKey, maxCacheableEntries> patternKeyArray;
+    RegExpCacheMap m_cacheMap;
+    JSGlobalData* m_globalData;
+    int m_nextKeyToEvict;
+    bool m_isFull;
+};
+
+} // namespace JSC
+
+#endif // RegExpCache_h