26 #define SHARE_OOPS_ARRAYKLASS_HPP
27
28 #include "memory/universe.hpp"
29 #include "oops/klass.hpp"
30
31 class fieldDescriptor;
32 class klassVtable;
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 Klass* volatile _higher_dimension; // Refers the (n+1)'th-dimensional array (if present).
43 Klass* 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, KlassID id);
50 ArrayKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for cds"); }
51
52 public:
53 // Testing operation
54 DEBUG_ONLY(bool is_array_klass_slow() const { return true; })
55
56 // Instance variables
57 int dimension() const { return _dimension; }
58 void set_dimension(int dimension) { _dimension = dimension; }
59
60 Klass* higher_dimension() const { return _higher_dimension; }
61 inline Klass* higher_dimension_acquire() const; // load with acquire semantics
62 void set_higher_dimension(Klass* k) { _higher_dimension = k; }
63 inline void release_set_higher_dimension(Klass* k); // store with release semantics
64
65 Klass* lower_dimension() const { return _lower_dimension; }
66 void set_lower_dimension(Klass* k) { _lower_dimension = k; }
67
68 // offset of first element, including any padding for the sake of alignment
69 int array_header_in_bytes() const { return layout_helper_header_size(layout_helper()); }
70 int log2_element_size() const { return layout_helper_log2_element_size(layout_helper()); }
71 // type of elements (T_OBJECT for both oop arrays and array-arrays)
72 BasicType element_type() const { return layout_helper_element_type(layout_helper()); }
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26 #define SHARE_OOPS_ARRAYKLASS_HPP
27
28 #include "memory/universe.hpp"
29 #include "oops/klass.hpp"
30
31 class fieldDescriptor;
32 class klassVtable;
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 Klass* volatile _higher_dimension; // Refers the (n+1)'th-dimensional array (if present).
43 Klass* volatile _lower_dimension; // Refers the (n-1)'th-dimensional array (if present).
44
45 protected:
46 Klass* _element_klass; // The klass of the elements of this array type
47 // The element type must be registered for both object arrays
48 // (incl. object arrays with value type elements) and value type
49 // arrays containing flattened value types. However, the element
50 // type must not be registered for arrays of primitive types.
51 // TODO: Update the class hierarchy so that element klass appears
52 // only in array that contain non-primitive types.
53 // Constructors
54 // The constructor with the Symbol argument does the real array
55 // initialization, the other is a dummy
56 ArrayKlass(Symbol* name, KlassID id);
57 ArrayKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for cds"); }
58
59 // Create array_name for element klass, creates a permanent symbol, returns result
60 static Symbol* create_element_klass_array_name(Klass* element_klass, TRAPS);
61
62 public:
63 // Instance variables
64 virtual Klass* element_klass() const { return _element_klass; }
65 virtual void set_element_klass(Klass* k) { _element_klass = k; }
66
67 // Compiler/Interpreter offset
68 static ByteSize element_klass_offset() { return in_ByteSize(offset_of(ArrayKlass, _element_klass)); }
69
70 // Testing operation
71 DEBUG_ONLY(bool is_array_klass_slow() const { return true; })
72
73 // Instance variables
74 int dimension() const { return _dimension; }
75 void set_dimension(int dimension) { _dimension = dimension; }
76
77 Klass* higher_dimension() const { return _higher_dimension; }
78 inline Klass* higher_dimension_acquire() const; // load with acquire semantics
79 void set_higher_dimension(Klass* k) { _higher_dimension = k; }
80 inline void release_set_higher_dimension(Klass* k); // store with release semantics
81
82 Klass* lower_dimension() const { return _lower_dimension; }
83 void set_lower_dimension(Klass* k) { _lower_dimension = k; }
84
85 // offset of first element, including any padding for the sake of alignment
86 int array_header_in_bytes() const { return layout_helper_header_size(layout_helper()); }
87 int log2_element_size() const { return layout_helper_log2_element_size(layout_helper()); }
88 // type of elements (T_OBJECT for both oop arrays and array-arrays)
89 BasicType element_type() const { return layout_helper_element_type(layout_helper()); }
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