Changeset 47267 in webkit for trunk/JavaScriptCore/runtime/JSString.h

Timestamp:

Aug 13, 2009, 10:35:33 PM (16 years ago)

Author:

[email protected]

Message:

Devirtualise marking
​https://bugs.webkit.org/show_bug.cgi?id=28294

Reviewed by Maciej Stachowiak.

Add a bit to TypeInfo to indicate that an object uses the standard
JSObject::markChildren method. This allows us to devirtualise marking
of most objects (though a branch is still needed). We also add a branch
to identify arrays thus devirtualising marking in that case as well.

In order to make the best use of this devirtualisation I've also reworked
the MarkStack::drain() logic to make the iteration more efficient.

File:

• trunk/JavaScriptCore/runtime/JSString.h (modified) (1 diff)

trunk/JavaScriptCore/runtime/JSString.h

@@ -91 +91 @@
         JSString* getIndex(JSGlobalData*, unsigned);
 
-        static PassRefPtr<Structure> createStructure(JSValue proto) { return Structure::create(proto, TypeInfo(StringType, NeedsThisConversion)); }
+        static PassRefPtr<Structure> createStructure(JSValue proto) { return Structure::create(proto, TypeInfo(StringType, NeedsThisConversion | HasDefaultMark)); }
 
     private: