--- old/src/share/vm/gc_implementation/shared/gcHeapSummary.hpp	2019-08-16 11:54:02.692923508 +0800
+++ new/src/share/vm/gc_implementation/shared/gcHeapSummary.hpp	2019-08-16 11:54:02.629921312 +0800
@@ -78,11 +78,13 @@
 
 class GCHeapSummary;
 class PSHeapSummary;
+class G1HeapSummary;
 
 class GCHeapSummaryVisitor {
  public:
   virtual void visit(const GCHeapSummary* heap_summary) const = 0;
   virtual void visit(const PSHeapSummary* heap_summary) const {}
+  virtual void visit(const G1HeapSummary* heap_summary) const {}
 };
 
 class GCHeapSummary : public StackObj {
@@ -122,6 +124,24 @@
 
    virtual void accept(GCHeapSummaryVisitor* visitor) const {
      visitor->visit(this);
+   }
+};
+
+class G1HeapSummary : public GCHeapSummary {
+  size_t  _edenUsed;
+  size_t  _edenCapacity;
+  size_t  _survivorUsed;
+  uint    _numberOfRegions;
+ public:
+   G1HeapSummary(VirtualSpaceSummary& heap_space, size_t heap_used, size_t edenUsed, size_t edenCapacity, size_t survivorUsed, uint numberOfRegions) :
+      GCHeapSummary(heap_space, heap_used), _edenUsed(edenUsed), _edenCapacity(edenCapacity), _survivorUsed(survivorUsed), _numberOfRegions(numberOfRegions) { }
+   const size_t edenUsed() const { return _edenUsed; }
+   const size_t edenCapacity() const { return _edenCapacity; }
+   const size_t survivorUsed() const { return _survivorUsed; }
+   const uint   numberOfRegions() const { return _numberOfRegions; }
+
+   virtual void accept(GCHeapSummaryVisitor* visitor) const {
+     visitor->visit(this);
    }
 };