6912621: iCMS: Error: assert(_markBitMap.isMarked(addr + 1),"Missing Printezis bit?") Summary: Fix block_size_if_printezis_bits() so it does not expect the bits, only uses them when available. Fix block_size_no_stall() so it does not stall when the bits are missing such cases, letting the caller deal with zero size returns. Constant pool cache oops do not need to be unparsable or conc_unsafe after their klass pointer is installed. Some cosmetic clean-ups and some assertion checking for conc-usafety which, in the presence of class file redefinition, has no a-priori time boundedness, so all GCs must be able to safely deal with putatively conc-unsafe objects in a stop-world pause. Reviewed-by: jmasa, johnc

--- a/src/share/vm/oops/oop.hpp	Thu Feb 03 20:49:09 2011 -0800
+++ b/src/share/vm/oops/oop.hpp	Mon Feb 07 22:19:57 2011 -0800
@@ -71,6 +71,11 @@
   static BarrierSet* _bs;
 
  public:
+  enum ConcSafeType {
+    IsUnsafeConc = false,
+    IsSafeConc   = true
+  };
+
   markOop  mark() const         { return _mark; }
   markOop* mark_addr() const    { return (markOop*) &_mark; }