typeArrayKlass.hpp revision 1472:c18cbe5936b8 
1/*
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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5 * This code is free software; you can redistribute it and/or modify it
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7 * published by the Free Software Foundation.
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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23 */
24
25// A typeArrayKlass is the klass of a typeArray
26// It contains the type and size of the elements
27
28class typeArrayKlass : public arrayKlass {
29  friend class VMStructs;
30 private:
31  jint _max_length;            // maximum number of elements allowed in an array
32 public:
33  // instance variables
34  jint max_length()                     { return _max_length; }
35  void set_max_length(jint m)           { _max_length = m;    }
36
37  // testers
38  bool oop_is_typeArray_slow() const    { return true; }
39
40  // klass allocation
41  DEFINE_ALLOCATE_PERMANENT(typeArrayKlass);
42  static klassOop create_klass(BasicType type, int scale, const char* name_str,
43                               TRAPS);
44  static inline klassOop create_klass(BasicType type, int scale, TRAPS) {
45    return create_klass(type, scale, external_name(type), CHECK_NULL);
46  }
47
48  int oop_size(oop obj) const;
49  int klass_oop_size() const  { return object_size(); }
50
51  bool compute_is_subtype_of(klassOop k);
52
53  // Allocation
54  typeArrayOop allocate(int length, TRAPS);
55  typeArrayOop allocate_permanent(int length, TRAPS);  // used for class file structures
56  oop multi_allocate(int rank, jint* sizes, TRAPS);
57
58  // Copying
59  void  copy_array(arrayOop s, int src_pos, arrayOop d, int dst_pos, int length, TRAPS);
60
61  // Iteration
62  int oop_oop_iterate(oop obj, OopClosure* blk);
63  int oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr);
64
65  // Garbage collection
66  void oop_follow_contents(oop obj);
67  int  oop_adjust_pointers(oop obj);
68
69  // Parallel Scavenge and Parallel Old
70  PARALLEL_GC_DECLS
71
72 protected:
73  // Find n'th dimensional array
74  virtual klassOop array_klass_impl(bool or_null, int n, TRAPS);
75
76  // Returns the array class with this class as element type
77  virtual klassOop array_klass_impl(bool or_null, TRAPS);
78
79 public:
80  // Casting from klassOop
81  static typeArrayKlass* cast(klassOop k) {
82    assert(k->klass_part()->oop_is_typeArray_slow(), "cast to typeArrayKlass");
83    return (typeArrayKlass*) k->klass_part();
84  }
85
86  // Naming
87  static const char* external_name(BasicType type);
88
89  // Sizing
90  static int header_size()  { return oopDesc::header_size() + sizeof(typeArrayKlass)/HeapWordSize; }
91  int object_size() const   { return arrayKlass::object_size(header_size()); }
92
93  // Initialization (virtual from Klass)
94  void initialize(TRAPS);
95
96 private:
97   // Helpers
98   static klassOop array_klass_impl(typeArrayKlassHandle h_this, bool or_null, int n, TRAPS);
99
100#ifndef PRODUCT
101 public:
102  // Printing
103  void oop_print_on(oop obj, outputStream* st);
104#endif
105 public:
106  const char* internal_name() const;
107};
108