478   VMOp_Type type() const { return VMOp_RedefineClasses; }
 479   bool doit_prologue();
 480   void doit();
 481   void doit_epilogue();
 482 
 483   bool allow_nested_vm_operations() const        { return true; }
 484   jvmtiError check_error()                       { return _res; }
 485 
 486   // Modifiable test must be shared between IsModifiableClass query
 487   // and redefine implementation
 488   static bool is_modifiable_class(oop klass_mirror);
 489 };
 490 
 491 
 492 // Helper class to mark and unmark metadata used on the stack as either handles
 493 // or executing methods, so that it can't be deleted during class redefinition
 494 // and class unloading.
 495 class MetadataOnStackMark : public StackObj {
 496   NOT_PRODUCT(static bool _is_active;)
 497  public:
 498   MetadataOnStackMark();
 499   ~MetadataOnStackMark();
 500   static void record(Metadata* m);
 501 };
 502 
 503 #endif // SHARE_VM_PRIMS_JVMTIREDEFINECLASSES_HPP

 478   VMOp_Type type() const { return VMOp_RedefineClasses; }
 479   bool doit_prologue();
 480   void doit();
 481   void doit_epilogue();
 482 
 483   bool allow_nested_vm_operations() const        { return true; }
 484   jvmtiError check_error()                       { return _res; }
 485 
 486   // Modifiable test must be shared between IsModifiableClass query
 487   // and redefine implementation
 488   static bool is_modifiable_class(oop klass_mirror);
 489 };
 490 
 491 
 492 // Helper class to mark and unmark metadata used on the stack as either handles
 493 // or executing methods, so that it can't be deleted during class redefinition
 494 // and class unloading.
 495 class MetadataOnStackMark : public StackObj {
 496   NOT_PRODUCT(static bool _is_active;)
 497  public:
 498   MetadataOnStackMark() NOT_JVMTI_RETURN;
 499   ~MetadataOnStackMark() NOT_JVMTI_RETURN;
 500   static void record(Metadata* m) NOT_JVMTI_RETURN;
 501 };
 502 
 503 #endif // SHARE_VM_PRIMS_JVMTIREDEFINECLASSES_HPP