src/hotspot/share/oops/instanceKlassFlags.hpp

@@ -52,12 +52,23 @@
      flag(is_shared_app_class                , 1 << 9) /* defining class loader is app class loader */ \
      flag(has_contended_annotations          , 1 << 10) /* has @Contended annotation */ \
      flag(has_localvariable_table            , 1 << 11) /* has localvariable information */ \
      flag(has_miranda_methods                , 1 << 12) /* True if this class has miranda methods in it's vtable */ \
      flag(has_final_method                   , 1 << 13) /* True if klass has final method */ \
+     flag(has_inline_type_fields             , 1 << 14) /* has inline fields and related embedded section is not empty */ \
+     flag(is_empty_inline_type               , 1 << 15) /* empty inline type (*) */ \
+     flag(is_naturally_atomic                , 1 << 16) /* loaded/stored in one instruction*/ \
+     flag(must_be_atomic                     , 1 << 17) /* doesn't allow tearing */ \
+     flag(has_loosely_consistent_annotation  , 1 << 18) /* the class has the LooselyConsistentValue annotation WARNING: it doesn't automatically mean that the class allows tearing */ \
+     flag(is_implicitly_constructible        , 1 << 19) /* the class has the ImplicitlyConstrutible annotation */ \
      /* end of list */
  
+   /* (*) An inline type is considered empty if it contains no non-static fields or
+      if it contains only empty inline fields. Note that JITs have a slightly different
+      definition: empty inline fields must be flat otherwise the container won't
+      be considered empty */
+ 
  #define IK_FLAGS_ENUM_NAME(name, value)    _misc_##name = value,
    enum {
      IK_FLAGS_DO(IK_FLAGS_ENUM_NAME)
    };
  #undef IK_FLAGS_ENUM_NAME

@@ -79,11 +90,11 @@
    u2 shared_loader_type_bits() const {
      return _misc_is_shared_boot_class|_misc_is_shared_platform_class|_misc_is_shared_app_class;
    }
  
    // These flags are write-once before the class is published and then read-only so don't require atomic updates.
-   u2 _flags;
+   u4 _flags;
  
    // These flags are written during execution so require atomic stores
    u1 _status;
  
   public:

@@ -105,10 +116,17 @@
    }
  
    void set_shared_class_loader_type(s2 loader_type);
  
    void assign_class_loader_type(const ClassLoaderData* cld);
+ 
+   u4 flags() const { return _flags; }
+ 
+   static u4 is_empty_inline_type_value() {
+     return _misc_is_empty_inline_type;
+   }
+ 
    void assert_is_safe(bool set) NOT_DEBUG_RETURN;
  
    // Create getters and setters for the status values.
  #define IK_STATUS_GET_SET(name, ignore)          \
    bool name() const { return (_status & _misc_##name) != 0; } \