Changeset 50711 in webkit for trunk/JavaScriptCore/runtime/JSGlobalData.h

Timestamp:

Nov 9, 2009, 8:14:34 PM (16 years ago)

Author:

[email protected]

Message:

Imported the v8 DST cache.

Reviewed by Oliver Hunt.

SunSpider says 1.5% faster.

• runtime/JSGlobalData.cpp:

(JSC::JSGlobalData::resetDateCache): Reset the DST cache when resetting
other date data.

• runtime/JSGlobalData.h:

(JSC::DSTOffsetCache::DSTOffsetCache):
(JSC::DSTOffsetCache::reset): Added a struct for the DST cache.

• wtf/DateMath.cpp:

(WTF::calculateDSTOffsetSimple):
(WTF::calculateDSTOffset):
(WTF::parseDateFromNullTerminatedCharacters):
(JSC::getDSTOffset):
(JSC::gregorianDateTimeToMS):
(JSC::msToGregorianDateTime):
(JSC::parseDateFromNullTerminatedCharacters):

• wtf/DateMath.h: The imported code for probing and updating the cache.

File:

• trunk/JavaScriptCore/runtime/JSGlobalData.h (modified) (3 diffs)

trunk/JavaScriptCore/runtime/JSGlobalData.h

@@ -63 +63 @@
     struct Instruction;    
     struct VPtrSet;
+
+    struct DSTOffsetCache {
+        DSTOffsetCache()
+        {
+            reset();
+        }
+        
+        void reset()
+        {
+            offset = 0.0;
+            start = 0.0;
+            end = -1.0;
+            increment = 0.0;
+        }
+
+        double offset;
+        double start;
+        double end;
+        double increment;
+    };
 
     class JSGlobalData : public RefCounted<JSGlobalData> {
@@ -155 +175 @@
 
         double cachedUTCOffset;
-
+        DSTOffsetCache dstOffsetCache;
+        
         UString cachedDateString;
         double cachedDateStringValue;
@@ -173 +194 @@
         void createNativeThunk();
     };
-
+    
 } // namespace JSC