src/hotspot/share/oops/oop.hpp

@@ -40,10 +40,20 @@
  // the format of Java objects so the fields can be accessed from C++.
  // oopDesc is abstract.
  // (see oopHierarchy for complete oop class hierarchy)
  //
  // no virtual functions allowed
+ //
+ // oopDesc::_mark - the "oop mark word" encoding to be found separately in markWord.hpp
+ //
+ // oopDesc::_metadata - encodes the object's klass pointer, as a raw pointer in "_klass"
+ //                      or compressed pointer in "_compressed_klass"
+ //
+ // The overall size of the _metadata field is dependent on "UseCompressedClassPointers",
+ // hence the terms "narrow" (32 bits) vs "wide" (64 bits).
+ //
+ 
  
  // Forward declarations.
  class OopClosure;
  class PSPromotionManager;
  class ParCompactionManager;

@@ -107,24 +117,29 @@
    // Sometimes (for complicated concurrency-related reasons), it is useful
    // to be able to figure out the size of an object knowing its klass.
    inline size_t size_given_klass(Klass* klass);
  
    // type test operations (inlined in oop.inline.hpp)
-   inline bool is_instance()    const;
-   inline bool is_instanceRef() const;
-   inline bool is_stackChunk()  const;
-   inline bool is_array()       const;
-   inline bool is_objArray()    const;
-   inline bool is_typeArray()   const;
+   inline bool is_instance()         const;
+   inline bool is_inline_type()      const;
+   inline bool is_instanceRef()      const;
+   inline bool is_stackChunk()       const;
+   inline bool is_array()            const;
+   inline bool is_objArray()         const;
+   inline bool is_typeArray()        const;
+   inline bool is_flatArray()        const;
+   inline bool is_null_free_array()  const;
  
    // type test operations that don't require inclusion of oop.inline.hpp.
-   bool is_instance_noinline()    const;
-   bool is_instanceRef_noinline() const;
-   bool is_stackChunk_noinline()  const;
-   bool is_array_noinline()       const;
-   bool is_objArray_noinline()    const;
-   bool is_typeArray_noinline()   const;
+   bool is_instance_noinline()         const;
+   bool is_instanceRef_noinline()      const;
+   bool is_stackChunk_noinline()       const;
+   bool is_array_noinline()            const;
+   bool is_objArray_noinline()         const;
+   bool is_typeArray_noinline()        const;
+   bool is_flatArray_noinline()        const;
+   bool is_null_free_array_noinline()  const;
  
   protected:
    inline oop        as_oop() const { return const_cast<oopDesc*>(this); }
  
   public: