X-Git-Url: https://git.saurik.com/apple/javascriptcore.git/blobdiff_plain/ba379fdc102753d6be2c4d937058fe40257329fe..f9bf01c6616d5ddcf65b13b33cedf9e387ff7a63:/runtime/NumericStrings.h

diff --git a/runtime/NumericStrings.h b/runtime/NumericStrings.h
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+/*
+ * Copyright (C) 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 NumericStrings_h
+#define NumericStrings_h
+
+#include "UString.h"
+#include <wtf/HashFunctions.h>
+
+namespace JSC {
+
+    class NumericStrings {
+    public:
+        UString add(double d)
+        {
+            CacheEntry<double>& entry = lookup(d);
+            if (d == entry.key && !entry.value.isNull())
+                return entry.value;
+            entry.key = d;
+            entry.value = UString::from(d);
+            return entry.value;
+        }
+
+        UString add(int i)
+        {
+            CacheEntry<int>& entry = lookup(i);
+            if (i == entry.key && !entry.value.isNull())
+                return entry.value;
+            entry.key = i;
+            entry.value = UString::from(i);
+            return entry.value;
+        }
+
+    private:
+        static const size_t cacheSize = 64;
+
+        template<typename T>
+        struct CacheEntry {
+            T key;
+            UString value;
+        };
+
+        CacheEntry<double>& lookup(double d) { return doubleCache[WTF::FloatHash<double>::hash(d) & (cacheSize - 1)]; }
+        CacheEntry<int>& lookup(int i) { return intCache[WTF::IntHash<int>::hash(i) & (cacheSize - 1)]; }
+
+        CacheEntry<double> doubleCache[cacheSize];
+        CacheEntry<int> intCache[cacheSize];
+    };
+
+} // namespace JSC
+
+#endif // NumericStrings_h