Changeset 51624 in webkit for trunk/JavaScriptCore/runtime/JSCell.h

Timestamp:

Dec 2, 2009, 10:25:58 PM (15 years ago)

Author:

[email protected]

Message:

Add zombies to JSC
​https://bugs.webkit.org/show_bug.cgi?id=32103

Reviewed by Gavin Barraclough.

Add a compile time flag to make the JSC collector replace "unreachable"
objects with zombie objects. The zombie object is a JSCell subclass that
ASSERTs on any attempt to use the JSCell methods. In addition there are
a number of additional assertions in bottleneck code to catch zombie usage
as quickly as possible.

Grrr. Argh. Brains.

File:

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

trunk/JavaScriptCore/runtime/JSCell.h

@@ -43 +43 @@
         friend class JSValue;
         friend class JSAPIValueWrapper;
+        friend class JSZombie;
         friend struct VPtrSet;
 
@@ -91 +92 @@
 
         virtual void markChildren(MarkStack&);
+#if ENABLE(JSC_ZOMBIES)
+        virtual bool isZombie() const { return false; }
+#endif
 
         // Object operations, with the toObject operation included.
@@ -343 +347 @@
         return cellBlock(c)->heap;
     }
-
+    
+#if ENABLE(JSC_ZOMBIES)
+    inline bool JSValue::isZombie() const
+    {
+        return isCell() && asCell() && asCell()->isZombie();
+    }
+#endif
 } // namespace JSC