8004845: Catch incorrect usage of new and delete during compile time for value objects and stack objects

Makes the "new" and "delete" operator of _ValueObj and StackObj private

Reviewed-by: dholmes, coleenp

hotspot/src/share/vm/memory/allocation.hpp

@@ -202,7 +202,7 @@ template <MEMFLAGS F> class CHeapObj ALLOCATION_SUPER_CLASS_SPEC {
 // Calling new or delete will result in fatal error.
 
 class StackObj ALLOCATION_SUPER_CLASS_SPEC {
- public:
+ private:
   void* operator new(size_t size);
   void  operator delete(void* p);
 };
@@ -226,7 +226,7 @@ class StackObj ALLOCATION_SUPER_CLASS_SPEC {
 // be defined as a an empty string "".
 //
 class _ValueObj {
- public:
+ private:
   void* operator new(size_t size);
   void operator delete(void* p);
 };

hotspot/src/share/vm/opto/node.cpp

@@ -1839,15 +1839,16 @@ uint Node::match_edge(uint idx) const {
   return idx;                   // True for other than index 0 (control)
 }
 
+static RegMask _not_used_at_all;
 // Register classes are defined for specific machines
 const RegMask &Node::out_RegMask() const {
   ShouldNotCallThis();
-  return *(new RegMask());
+  return _not_used_at_all;
 }
 
 const RegMask &Node::in_RegMask(uint) const {
   ShouldNotCallThis();
-  return *(new RegMask());
+  return _not_used_at_all;
 }
 
 //=============================================================================

hotspot/src/share/vm/services/memBaseline.hpp

@@ -334,7 +334,7 @@ class MemBaseline : public _ValueObj {
   // create a memory baseline
   MemBaseline();
 
-  virtual ~MemBaseline();
+  ~MemBaseline();
 
   inline bool baselined() const {
     return _baselined;

hotspot/src/share/vm/utilities/workgroup.hpp

@@ -90,7 +90,7 @@ protected:
     NOT_PRODUCT(_name = name);
     _counter = 0;
   }
-  virtual ~AbstractGangTask() { }
+  ~AbstractGangTask() { }
 
 public:
 };

hotspot/src/share/vm/utilities/yieldingWorkgroup.hpp

@@ -106,7 +106,7 @@ protected:
     _status(INACTIVE),
     _gang(NULL) { }
 
-  virtual ~YieldingFlexibleGangTask() { }
+  ~YieldingFlexibleGangTask() { }
 
   friend class YieldingFlexibleWorkGang;
   friend class YieldingFlexibleGangWorker;