8338490: Serial: Move Generation::print_on to subclasses

Reviewed-by: gli

Author: albertnetymk

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

@@ -846,7 +846,15 @@ void DefNewGeneration::verify() {
 }
 
 void DefNewGeneration::print_on(outputStream* st) const {
-  Generation::print_on(st);
+  st->print(" %-10s", name());
+
+  st->print(" total " SIZE_FORMAT "K, used " SIZE_FORMAT "K",
+            capacity()/K, used()/K);
+  st->print_cr(" [" PTR_FORMAT ", " PTR_FORMAT ", " PTR_FORMAT ")",
+               p2i(_virtual_space.low_boundary()),
+               p2i(_virtual_space.high()),
+               p2i(_virtual_space.high_boundary()));
+
   st->print("  eden");
   eden()->print_on(st);
   st->print("  from");
@@ -855,11 +863,6 @@ void DefNewGeneration::print_on(outputStream* st) const {
   to()->print_on(st);
 }
 
-
-const char* DefNewGeneration::name() const {
-  return "def new generation";
-}
-
 HeapWord* DefNewGeneration::allocate(size_t word_size) {
   // This is the slow-path allocation for the DefNewGeneration.
   // Most allocations are fast-path in compiled code.

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

@@ -234,8 +234,7 @@ class DefNewGeneration: public Generation {
   void update_counters();
 
   // Printing
-  virtual const char* name() const;
-  virtual const char* short_name() const { return "DefNew"; }
+  const char* name() const { return "DefNew"; }
 
   void print_on(outputStream* st) const;
 

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

@@ -58,15 +58,3 @@ Generation::Generation(ReservedSpace rs, size_t initial_size) :
 size_t Generation::max_capacity() const {
   return reserved().byte_size();
 }
-
-void Generation::print() const { print_on(tty); }
-
-void Generation::print_on(outputStream* st)  const {
-  st->print(" %-20s", name());
-  st->print(" total " SIZE_FORMAT "K, used " SIZE_FORMAT "K",
-             capacity()/K, used()/K);
-  st->print_cr(" [" PTR_FORMAT ", " PTR_FORMAT ", " PTR_FORMAT ")",
-              p2i(_virtual_space.low_boundary()),
-              p2i(_virtual_space.high()),
-              p2i(_virtual_space.high_boundary()));
-}

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

@@ -103,13 +103,6 @@ class Generation: public CHeapObj<mtGC> {
     return _reserved.contains(p);
   }
 
-  // Printing
-  virtual const char* name() const = 0;
-  virtual const char* short_name() const = 0;
-
-  virtual void print() const;
-  virtual void print_on(outputStream* st) const;
-
   virtual void verify() = 0;
 
 public:

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

@@ -882,12 +882,12 @@ void SerialHeap::verify(VerifyOption option /* ignored */) {
 }
 
 void SerialHeap::print_on(outputStream* st) const {
-  if (_young_gen != nullptr) {
-    _young_gen->print_on(st);
-  }
-  if (_old_gen != nullptr) {
-    _old_gen->print_on(st);
-  }
+  assert(_young_gen != nullptr, "precondition");
+  assert(_old_gen   != nullptr, "precondition");
+
+  _young_gen->print_on(st);
+  _old_gen->print_on(st);
+
   MetaspaceUtils::print_on(st);
 }
 
@@ -908,7 +908,7 @@ void SerialHeap::print_heap_change(const PreGenGCValues& pre_gc_values) const {
   log_info(gc, heap)(HEAP_CHANGE_FORMAT" "
                      HEAP_CHANGE_FORMAT" "
                      HEAP_CHANGE_FORMAT,
-                     HEAP_CHANGE_FORMAT_ARGS(def_new_gen->short_name(),
+                     HEAP_CHANGE_FORMAT_ARGS(def_new_gen->name(),
                                              pre_gc_values.young_gen_used(),
                                              pre_gc_values.young_gen_capacity(),
                                              def_new_gen->used(),
@@ -924,7 +924,7 @@ void SerialHeap::print_heap_change(const PreGenGCValues& pre_gc_values) const {
                                              def_new_gen->from()->used(),
                                              def_new_gen->from()->capacity()));
   log_info(gc, heap)(HEAP_CHANGE_FORMAT,
-                     HEAP_CHANGE_FORMAT_ARGS(old_gen()->short_name(),
+                     HEAP_CHANGE_FORMAT_ARGS(old_gen()->name(),
                                              pre_gc_values.old_gen_used(),
                                              pre_gc_values.old_gen_capacity(),
                                              old_gen()->used(),

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

@@ -440,7 +440,15 @@ void TenuredGeneration::verify() {
 }
 
 void TenuredGeneration::print_on(outputStream* st)  const {
-  Generation::print_on(st);
+  st->print(" %-10s", name());
+
+  st->print(" total " SIZE_FORMAT "K, used " SIZE_FORMAT "K",
+            capacity()/K, used()/K);
+  st->print_cr(" [" PTR_FORMAT ", " PTR_FORMAT ", " PTR_FORMAT ")",
+               p2i(_virtual_space.low_boundary()),
+               p2i(_virtual_space.high()),
+               p2i(_virtual_space.high_boundary()));
+
   st->print("   the");
   _the_space->print_on(st);
 }

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

@@ -121,8 +121,7 @@ class TenuredGeneration: public Generation {
                     CardTableRS* remset);
 
   // Printing
-  const char* name() const { return "tenured generation"; }
-  const char* short_name() const { return "Tenured"; }
+  const char* name() const { return "Tenured"; }
 
   // Iteration
   void object_iterate(ObjectClosure* blk);