RFR (XS) 8222843: Print Shenandoah cset map addresses in hs_err

[Aleksey Shipilev]

RFE:
  https://bugs.openjdk.java.net/browse/JDK-8222843

Fix:

diff -r 8eae2646fed8 src/hotspot/share/gc/shenandoah/shenandoahCollectionSet.hpp
--- a/src/hotspot/share/gc/shenandoah/shenandoahCollectionSet.hpp       Tue Apr 23 10:58:24 2019 +0200
+++ b/src/hotspot/share/gc/shenandoah/shenandoahCollectionSet.hpp       Tue Apr 23 11:13:05 2019 +0200
@@ -89,4 +89,7 @@

 private:
+  jbyte* map_address() const {
+    return _cset_map;
+  }
   jbyte* biased_map_address() const {
     return _biased_cset_map;
diff -r 8eae2646fed8 src/hotspot/share/gc/shenandoah/shenandoahHeap.cpp
--- a/src/hotspot/share/gc/shenandoah/shenandoahHeap.cpp        Tue Apr 23 10:58:24 2019 +0200
+++ b/src/hotspot/share/gc/shenandoah/shenandoahHeap.cpp        Tue Apr 23 11:13:05 2019 +0200
@@ -538,4 +538,13 @@
                p2i(reserved_region().end()));

+  ShenandoahCollectionSet* cset = collection_set();
+  st->print_cr("Collection set:");
+  if (cset != NULL) {
+    st->print_cr(" - map (vanilla): " PTR_FORMAT, p2i(cset->map_address()));
+    st->print_cr(" - map (biased):  " PTR_FORMAT, p2i(cset->biased_map_address()));
+  } else {
+    st->print_cr(" (NULL)");
+  }
+
   st->cr();
   MetaspaceUtils::print_on(st);


Testing: eyeballing hs_errs

-- 
Thanks,
-Aleksey