8324970: Serial: Refactor signature of maintain_old_to_young_invariant

Reviewed-by: tschatzl

Author: albertnetymk

src/hotspot/share/gc/serial/cardTableRS.cpp

@@ -27,6 +27,7 @@
 #include "gc/serial/cardTableRS.hpp"
 #include "gc/serial/generation.hpp"
 #include "gc/serial/serialHeap.hpp"
+#include "gc/serial/tenuredGeneration.hpp"
 #include "gc/shared/space.inline.hpp"
 #include "memory/iterator.inline.hpp"
 #include "utilities/align.hpp"
@@ -54,9 +55,8 @@ void CardTableRS::verify_used_region_at_save_marks(Space* sp) const {
 }
 #endif
 
-void CardTableRS::maintain_old_to_young_invariant(Generation* old_gen, bool is_young_gen_empty) {
-  assert(SerialHeap::heap()->is_old_gen(old_gen), "precondition");
-
+void CardTableRS::maintain_old_to_young_invariant(TenuredGeneration* old_gen,
+                                                  bool is_young_gen_empty) {
   if (is_young_gen_empty) {
     clear_MemRegion(old_gen->prev_used_region());
   } else {

src/hotspot/share/gc/serial/cardTableRS.hpp

@@ -29,8 +29,8 @@
 #include "memory/memRegion.hpp"
 #include "oops/oop.hpp"
 
-class Generation;
 class Space;
+class TenuredGeneration;
 class TenuredSpace;
 
 // This RemSet uses a card table both as shared data structure
@@ -80,7 +80,7 @@ class CardTableRS : public CardTable {
   // the old generation card table completely if the young generation had been
   // completely evacuated, otherwise dirties the whole old generation to
   // conservatively not loose any old-to-young pointer.
-  void maintain_old_to_young_invariant(Generation* old_gen, bool is_young_gen_empty);
+  void maintain_old_to_young_invariant(TenuredGeneration* old_gen, bool is_young_gen_empty);
 
   // Iterate over the portion of the card-table which covers the given
   // region mr in the given space and apply cl to any dirty sub-regions