JavaScriptCore-621.1.tar.gz

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

diff --git a/runtime/RegExpCache.cpp b/runtime/RegExpCache.cpp
new file mode 100644 (file)
index 0000000..192df4d
--- /dev/null
+++ b/runtime/RegExpCache.cpp
@@ -0,0 +1,78 @@
+/*
+ * 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 "config.h"
+
+#include "RegExpCache.h"
+
+namespace JSC {
+
+PassRefPtr<RegExp> RegExpCache::lookupOrCreate(const UString& patternString, const UString& flags)
+{
+    if (patternString.size() < maxCacheablePatternLength) {
+        pair<HashMap<RegExpKey, RefPtr<RegExp> >::iterator, bool> result = m_cacheMap.add(RegExpKey(flags, patternString), 0);
+        if (!result.second)
+            return result.first->second;
+    }
+    return create(patternString, flags);
+}
+
+PassRefPtr<RegExp> RegExpCache::create(const UString& patternString, const UString& flags) 
+{
+    RefPtr<RegExp> regExp;
+
+    if (!flags.isNull())
+        regExp = RegExp::create(m_globalData, patternString, flags);
+    else
+        regExp = RegExp::create(m_globalData, patternString);
+
+    if (patternString.size() >= maxCacheablePatternLength)
+        return regExp;
+
+    ++m_nextKeyToEvict;
+    if (m_nextKeyToEvict == maxCacheableEntries) {
+        m_nextKeyToEvict = 0;
+        m_isFull = true;
+    }
+    if (m_isFull)
+        m_cacheMap.remove(RegExpKey(patternKeyArray[m_nextKeyToEvict].flagsValue, patternKeyArray[m_nextKeyToEvict].pattern));
+
+    RegExpKey key = RegExpKey(flags, patternString);
+    m_cacheMap.set(key, regExp);
+    patternKeyArray[m_nextKeyToEvict].flagsValue = key.flagsValue;
+    patternKeyArray[m_nextKeyToEvict].pattern = patternString.rep();
+    return regExp;
+}
+
+RegExpCache::RegExpCache(JSGlobalData* globalData)
+    : m_globalData(globalData)
+    , m_nextKeyToEvict(-1)
+    , m_isFull(false)
+{
+}
+
+}