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src/hotspot/share/oops/arrayKlass.hpp

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 18  *
 19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 20  * or visit www.oracle.com if you need additional information or have any
 21  * questions.
 22  *
 23  */
 24 
 25 #ifndef SHARE_OOPS_ARRAYKLASS_HPP
 26 #define SHARE_OOPS_ARRAYKLASS_HPP
 27 
 28 #include "oops/klass.hpp"
 29 
 30 class fieldDescriptor;
 31 class klassVtable;
 32 class ObjArrayKlass;
 33 
 34 // ArrayKlass is the abstract baseclass for all array classes
 35 
 36 class ArrayKlass: public Klass {
 37   friend class VMStructs;















 38  private:
 39   // If you add a new field that points to any metaspace object, you
 40   // must add this field to ArrayKlass::metaspace_pointers_do().
 41   int      _dimension;         // This is n'th-dimensional array.

 42   ObjArrayKlass* volatile _higher_dimension;  // Refers the (n+1)'th-dimensional array (if present).
 43   ArrayKlass* volatile    _lower_dimension;   // Refers the (n-1)'th-dimensional array (if present).
 44 
 45  protected:
 46   // Constructors
 47   // The constructor with the Symbol argument does the real array
 48   // initialization, the other is a dummy
 49   ArrayKlass(Symbol* name, KlassKind kind);
 50   ArrayKlass();
 51 



 52  public:

 53   // Testing operation
 54   DEBUG_ONLY(bool is_array_klass_slow() const { return true; })
 55 
 56   // Returns the ObjArrayKlass for n'th dimension.
 57   ArrayKlass* array_klass(int n, TRAPS);
 58   ArrayKlass* array_klass_or_null(int n);
 59 
 60   // Returns the array class with this class as element type.
 61   ArrayKlass* array_klass(TRAPS);
 62   ArrayKlass* array_klass_or_null();
 63 
 64   // Instance variables
 65   int dimension() const                 { return _dimension;      }
 66   void set_dimension(int dimension)     { _dimension = dimension; }
 67 



 68   ObjArrayKlass* higher_dimension() const     { return _higher_dimension; }
 69   inline ObjArrayKlass* higher_dimension_acquire() const; // load with acquire semantics
 70   void set_higher_dimension(ObjArrayKlass* k) { _higher_dimension = k; }
 71   inline void release_set_higher_dimension(ObjArrayKlass* k); // store with release semantics
 72 
 73   ArrayKlass* lower_dimension() const      { return _lower_dimension; }
 74   void set_lower_dimension(ArrayKlass* k)  { _lower_dimension = k; }
 75 
 76   // offset of first element, including any padding for the sake of alignment
 77   int  array_header_in_bytes() const    { return layout_helper_header_size(layout_helper()); }
 78   int  log2_element_size() const        { return layout_helper_log2_element_size(layout_helper()); }
 79   // type of elements (T_OBJECT for both oop arrays and array-arrays)
 80   BasicType element_type() const        { return layout_helper_element_type(layout_helper()); }
 81 
 82   virtual InstanceKlass* java_super() const;
 83 
 84   // Allocation
 85   // Sizes points to the first dimension of the array, subsequent dimensions
 86   // are always in higher memory.  The callers of these set that up.
 87   virtual oop multi_allocate(int rank, jint* sizes, TRAPS);

 90   Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
 91 
 92   // Lookup operations
 93   Method* uncached_lookup_method(const Symbol* name,
 94                                  const Symbol* signature,
 95                                  OverpassLookupMode overpass_mode,
 96                                  PrivateLookupMode private_mode = PrivateLookupMode::find) const;
 97 
 98   static ArrayKlass* cast(Klass* k) {
 99     return const_cast<ArrayKlass*>(cast(const_cast<const Klass*>(k)));
100   }
101 
102   static const ArrayKlass* cast(const Klass* k) {
103     assert(k->is_array_klass(), "cast to ArrayKlass");
104     return static_cast<const ArrayKlass*>(k);
105   }
106 
107   GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots,
108                                                   Array<InstanceKlass*>* transitive_interfaces);
109 


110   // Sizing
111   static int static_size(int header_size);
112 
113   virtual void metaspace_pointers_do(MetaspaceClosure* iter);
114 
115   // Return a handle.
116   static void     complete_create_array_klass(ArrayKlass* k, Klass* super_klass, ModuleEntry* module, TRAPS);
117 
118   // JVMTI support
119   jint jvmti_class_status() const;
120 
121 #if INCLUDE_CDS
122   // CDS support - remove and restore oops from metadata. Oops are not shared.
123   virtual void remove_unshareable_info();
124   virtual void remove_java_mirror();
125   void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS);
126   void cds_print_value_on(outputStream* st) const;
127 #endif
128 
129   void log_array_class_load(Klass* k);
130   // Printing
131   void print_on(outputStream* st) const;
132   void print_value_on(outputStream* st) const;
133 
134   void oop_print_on(oop obj, outputStream* st);
135 
136   // Verification
137   void verify_on(outputStream* st);
138 
139   void oop_verify_on(oop obj, outputStream* st);
140 };
141 








142 #endif // SHARE_OOPS_ARRAYKLASS_HPP

 18  *
 19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 20  * or visit www.oracle.com if you need additional information or have any
 21  * questions.
 22  *
 23  */
 24 
 25 #ifndef SHARE_OOPS_ARRAYKLASS_HPP
 26 #define SHARE_OOPS_ARRAYKLASS_HPP
 27 
 28 #include "oops/klass.hpp"
 29 
 30 class fieldDescriptor;
 31 class klassVtable;
 32 class ObjArrayKlass;
 33 
 34 // ArrayKlass is the abstract baseclass for all array classes
 35 
 36 class ArrayKlass: public Klass {
 37   friend class VMStructs;
 38 
 39  public:
 40   enum ArrayProperties : uint32_t {
 41     DEFAULT         = 0,
 42     NULL_RESTRICTED = 1 << 0,
 43     NON_ATOMIC      = 1 << 1,
 44     // FINAL           = 1 << 2,
 45     // VOLATILE        = 1 << 3
 46     INVALID         = 1 << 4,
 47     DUMMY           = 1 << 5      // Just to transition the code, to be removed ASAP
 48   };
 49 
 50   static bool is_null_restricted(ArrayProperties props) { return (props & NULL_RESTRICTED) != 0; }
 51   static bool is_non_atomic(ArrayProperties props) { return (props & NON_ATOMIC) != 0; }
 52 
 53  private:
 54   // If you add a new field that points to any metaspace object, you
 55   // must add this field to ArrayKlass::metaspace_pointers_do().
 56   int      _dimension;         // This is n'th-dimensional array.
 57   ArrayProperties _properties;
 58   ObjArrayKlass* volatile _higher_dimension;  // Refers the (n+1)'th-dimensional array (if present).
 59   ArrayKlass* volatile    _lower_dimension;   // Refers the (n-1)'th-dimensional array (if present).
 60 
 61  protected:
 62   // Constructors
 63   // The constructor with the Symbol argument does the real array
 64   // initialization, the other is a dummy
 65   ArrayKlass(Symbol* name, KlassKind kind, ArrayProperties props, markWord prototype_header = markWord::prototype());
 66   ArrayKlass();
 67 
 68   // Create array_name for element klass
 69   static Symbol* create_element_klass_array_name(Klass* element_klass, TRAPS);
 70 
 71  public:
 72 
 73   // Testing operation
 74   DEBUG_ONLY(bool is_array_klass_slow() const { return true; })
 75 
 76   // Returns the ObjArrayKlass for n'th dimension.
 77   ArrayKlass* array_klass(int n, TRAPS);
 78   ArrayKlass* array_klass_or_null(int n);
 79 
 80   // Returns the array class with this class as element type.
 81   ArrayKlass* array_klass(TRAPS);
 82   ArrayKlass* array_klass_or_null();
 83 
 84   // Instance variables
 85   int dimension() const                 { return _dimension;      }
 86   void set_dimension(int dimension)     { _dimension = dimension; }
 87 
 88   ArrayProperties properties() const { return _properties; }
 89   void set_properties(ArrayProperties props) { _properties = props; }
 90 
 91   ObjArrayKlass* higher_dimension() const     { return _higher_dimension; }
 92   inline ObjArrayKlass* higher_dimension_acquire() const; // load with acquire semantics
 93   void set_higher_dimension(ObjArrayKlass* k) { _higher_dimension = k; }
 94   inline void release_set_higher_dimension(ObjArrayKlass* k); // store with release semantics
 95 
 96   ArrayKlass* lower_dimension() const      { return _lower_dimension; }
 97   void set_lower_dimension(ArrayKlass* k)  { _lower_dimension = k; }
 98 
 99   // offset of first element, including any padding for the sake of alignment
100   int  array_header_in_bytes() const    { return layout_helper_header_size(layout_helper()); }
101   int  log2_element_size() const        { return layout_helper_log2_element_size(layout_helper()); }
102   // type of elements (T_OBJECT for both oop arrays and array-arrays)
103   BasicType element_type() const        { return layout_helper_element_type(layout_helper()); }
104 
105   virtual InstanceKlass* java_super() const;
106 
107   // Allocation
108   // Sizes points to the first dimension of the array, subsequent dimensions
109   // are always in higher memory.  The callers of these set that up.
110   virtual oop multi_allocate(int rank, jint* sizes, TRAPS);

113   Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
114 
115   // Lookup operations
116   Method* uncached_lookup_method(const Symbol* name,
117                                  const Symbol* signature,
118                                  OverpassLookupMode overpass_mode,
119                                  PrivateLookupMode private_mode = PrivateLookupMode::find) const;
120 
121   static ArrayKlass* cast(Klass* k) {
122     return const_cast<ArrayKlass*>(cast(const_cast<const Klass*>(k)));
123   }
124 
125   static const ArrayKlass* cast(const Klass* k) {
126     assert(k->is_array_klass(), "cast to ArrayKlass");
127     return static_cast<const ArrayKlass*>(k);
128   }
129 
130   GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots,
131                                                   Array<InstanceKlass*>* transitive_interfaces);
132 
133   oop component_mirror() const;
134 
135   // Sizing
136   static int static_size(int header_size);
137 
138   virtual void metaspace_pointers_do(MetaspaceClosure* iter);
139 
140   // Return a handle.
141   static void     complete_create_array_klass(ArrayKlass* k, Klass* super_klass, ModuleEntry* module, TRAPS);
142 
143   // JVMTI support
144   jint jvmti_class_status() const;
145 
146 #if INCLUDE_CDS
147   // CDS support - remove and restore oops from metadata. Oops are not shared.
148   virtual void remove_unshareable_info();
149   virtual void remove_java_mirror();
150   void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS);
151   void cds_print_value_on(outputStream* st) const;
152 #endif
153 
154   void log_array_class_load(Klass* k);
155   // Printing
156   void print_on(outputStream* st) const;
157   void print_value_on(outputStream* st) const;
158 
159   void oop_print_on(oop obj, outputStream* st);
160 
161   // Verification
162   void verify_on(outputStream* st);
163 
164   void oop_verify_on(oop obj, outputStream* st);
165 };
166 
167 class ArrayDescription : public StackObj {
168   public:
169    Klass::KlassKind _kind;
170    ArrayKlass::ArrayProperties _properties;
171    LayoutKind _layout_kind;
172    ArrayDescription(Klass::KlassKind k, ArrayKlass::ArrayProperties p, LayoutKind lk) { _kind = k; _properties = p; _layout_kind = lk; }
173  };
174 
175 #endif // SHARE_OOPS_ARRAYKLASS_HPP
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