webkitgtk-2.10.2webkitgtk-2.10.2

1 files changed, 98 insertions, 0 deletions

diff --git a/Source/JavaScriptCore/runtime/NumericStrings.h b/Source/JavaScriptCore/runtime/NumericStrings.h
new file mode 100644
index 000000000..ac8d41603
--- /dev/null
+++ b/Source/JavaScriptCore/runtime/NumericStrings.h
@@ -0,0 +1,98 @@
+/*
+ * 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 <array>
+#include <wtf/HashFunctions.h>
+#include <wtf/text/WTFString.h>
+
+namespace JSC {
+
+class NumericStrings {
+public:
+    ALWAYS_INLINE String add(double d)
+    {
+        CacheEntry<double>& entry = lookup(d);
+        if (d == entry.key && !entry.value.isNull())
+            return entry.value;
+        entry.key = d;
+        entry.value = String::numberToStringECMAScript(d);
+        return entry.value;
+    }
+
+    ALWAYS_INLINE String add(int i)
+    {
+        if (static_cast<unsigned>(i) < cacheSize)
+            return lookupSmallString(static_cast<unsigned>(i));
+        CacheEntry<int>& entry = lookup(i);
+        if (i == entry.key && !entry.value.isNull())
+            return entry.value;
+        entry.key = i;
+        entry.value = String::number(i);
+        return entry.value;
+    }
+
+    ALWAYS_INLINE String add(unsigned i)
+    {
+        if (i < cacheSize)
+            return lookupSmallString(static_cast<unsigned>(i));
+        CacheEntry<unsigned>& entry = lookup(i);
+        if (i == entry.key && !entry.value.isNull())
+            return entry.value;
+        entry.key = i;
+        entry.value = String::number(i);
+        return entry.value;
+    }
+private:
+    static const size_t cacheSize = 64;
+
+    template<typename T>
+    struct CacheEntry {
+        T key;
+        String 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<unsigned>& lookup(unsigned i) { return unsignedCache[WTF::IntHash<unsigned>::hash(i) & (cacheSize - 1)]; }
+    ALWAYS_INLINE const String& lookupSmallString(unsigned i)
+    {
+        ASSERT(i < cacheSize);
+        if (smallIntCache[i].isNull())
+            smallIntCache[i] = String::number(i);
+        return smallIntCache[i];
+    }
+
+    std::array<CacheEntry<double>, cacheSize> doubleCache;
+    std::array<CacheEntry<int>, cacheSize> intCache;
+    std::array<CacheEntry<unsigned>, cacheSize> unsignedCache;
+    std::array<String, cacheSize> smallIntCache;
+};
+
+} // namespace JSC
+
+#endif // NumericStrings_h