typeArrayKlass.hpp revision 5776:de6a9e811145 
1/*
2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
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.
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_VM_OOPS_TYPEARRAYKLASS_HPP
26#define SHARE_VM_OOPS_TYPEARRAYKLASS_HPP
27
28#include "classfile/classLoaderData.hpp"
29#include "oops/arrayKlass.hpp"
30
31// A TypeArrayKlass is the klass of a typeArray
32// It contains the type and size of the elements
33
34class TypeArrayKlass : public ArrayKlass {
35  friend class VMStructs;
36 private:
37  jint _max_length;            // maximum number of elements allowed in an array
38
39  // Constructor
40  TypeArrayKlass(BasicType type, Symbol* name);
41  static TypeArrayKlass* allocate(ClassLoaderData* loader_data, BasicType type, Symbol* name, TRAPS);
42 public:
43  TypeArrayKlass() {} // For dummy objects.
44
45  // instance variables
46  jint max_length()                     { return _max_length; }
47  void set_max_length(jint m)           { _max_length = m;    }
48
49  // testers
50  bool oop_is_typeArray_slow() const    { return true; }
51
52  // klass allocation
53  static TypeArrayKlass* create_klass(BasicType type, const char* name_str,
54                               TRAPS);
55  static inline Klass* create_klass(BasicType type, int scale, TRAPS) {
56    TypeArrayKlass* tak = create_klass(type, external_name(type), CHECK_NULL);
57    assert(scale == (1 << tak->log2_element_size()), "scale must check out");
58    return tak;
59  }
60
61  int oop_size(oop obj) const;
62
63  bool compute_is_subtype_of(Klass* k);
64
65  // Allocation
66  typeArrayOop allocate_common(int length, bool do_zero, TRAPS);
67  typeArrayOop allocate(int length, TRAPS) { return allocate_common(length, true, THREAD); }
68  oop multi_allocate(int rank, jint* sizes, TRAPS);
69
70  oop protection_domain() const { return NULL; }
71
72  // Copying
73  void  copy_array(arrayOop s, int src_pos, arrayOop d, int dst_pos, int length, TRAPS);
74
75  // Iteration
76  int oop_oop_iterate(oop obj, ExtendedOopClosure* blk);
77  int oop_oop_iterate_m(oop obj, ExtendedOopClosure* blk, MemRegion mr);
78
79  // Garbage collection
80  void oop_follow_contents(oop obj);
81  int  oop_adjust_pointers(oop obj);
82
83  // Parallel Scavenge and Parallel Old
84  PARALLEL_GC_DECLS
85
86 protected:
87  // Find n'th dimensional array
88  virtual Klass* array_klass_impl(bool or_null, int n, TRAPS);
89
90  // Returns the array class with this class as element type
91  virtual Klass* array_klass_impl(bool or_null, TRAPS);
92
93 public:
94  // Casting from Klass*
95  static TypeArrayKlass* cast(Klass* k) {
96    assert(k->oop_is_typeArray(), "cast to TypeArrayKlass");
97    return (TypeArrayKlass*) k;
98  }
99
100  // Naming
101  static const char* external_name(BasicType type);
102
103  // Sizing
104  static int header_size()  { return sizeof(TypeArrayKlass)/HeapWordSize; }
105  int size() const          { return ArrayKlass::static_size(header_size()); }
106
107  // Initialization (virtual from Klass)
108  void initialize(TRAPS);
109
110 public:
111  // Printing
112#ifndef PRODUCT
113  void oop_print_on(oop obj, outputStream* st);
114#endif
115
116  void print_on(outputStream* st) const;
117  void print_value_on(outputStream* st) const;
118
119 public:
120  const char* internal_name() const;
121};
122
123#endif // SHARE_VM_OOPS_TYPEARRAYKLASS_HPP
124