objArrayKlass.hpp revision 1472:c18cbe5936b8 
1/*
2 * Copyright (c) 1997, 2008, 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// objArrayKlass is the klass for objArrays
26
27class objArrayKlass : public arrayKlass {
28  friend class VMStructs;
29 private:
30  klassOop _element_klass;            // The klass of the elements of this array type
31  klassOop _bottom_klass;             // The one-dimensional type (instanceKlass or typeArrayKlass)
32 public:
33  // Instance variables
34  klassOop element_klass() const      { return _element_klass; }
35  void set_element_klass(klassOop k)  { oop_store_without_check((oop*) &_element_klass, (oop) k); }
36  oop* element_klass_addr()           { return (oop*)&_element_klass; }
37
38  klassOop bottom_klass() const       { return _bottom_klass; }
39  void set_bottom_klass(klassOop k)   { oop_store_without_check((oop*) &_bottom_klass, (oop) k); }
40  oop* bottom_klass_addr()            { return (oop*)&_bottom_klass; }
41
42  // Compiler/Interpreter offset
43  static int element_klass_offset_in_bytes() { return offset_of(objArrayKlass, _element_klass); }
44
45  // Dispatched operation
46  bool can_be_primary_super_slow() const;
47  objArrayOop compute_secondary_supers(int num_extra_slots, TRAPS);
48  bool compute_is_subtype_of(klassOop k);
49  bool oop_is_objArray_slow()  const  { return true; }
50  int oop_size(oop obj) const;
51  int klass_oop_size() const          { return object_size(); }
52
53  // Allocation
54  DEFINE_ALLOCATE_PERMANENT(objArrayKlass);
55  objArrayOop allocate(int length, TRAPS);
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  // Compute protection domain
62  oop protection_domain() { return Klass::cast(bottom_klass())->protection_domain(); }
63  // Compute class loader
64  oop class_loader() const { return Klass::cast(bottom_klass())->class_loader(); }
65
66 private:
67  // Either oop or narrowOop depending on UseCompressedOops.
68  // must be called from within objArrayKlass.cpp
69  template <class T> void do_copy(arrayOop s, T* src, arrayOop d,
70                                  T* dst, int length, TRAPS);
71 protected:
72  // Returns the objArrayKlass for n'th dimension.
73  virtual klassOop array_klass_impl(bool or_null, int n, TRAPS);
74
75  // Returns the array class with this class as element type.
76  virtual klassOop array_klass_impl(bool or_null, TRAPS);
77
78 public:
79  // Casting from klassOop
80  static objArrayKlass* cast(klassOop k) {
81    assert(k->klass_part()->oop_is_objArray_slow(), "cast to objArrayKlass");
82    return (objArrayKlass*) k->klass_part();
83  }
84
85  // Sizing
86  static int header_size()                { return oopDesc::header_size() + sizeof(objArrayKlass)/HeapWordSize; }
87  int object_size() const                 { return arrayKlass::object_size(header_size()); }
88
89  // Initialization (virtual from Klass)
90  void initialize(TRAPS);
91
92  // Garbage collection
93  void oop_follow_contents(oop obj);
94  inline void oop_follow_contents(oop obj, int index);
95  template <class T> inline void objarray_follow_contents(oop obj, int index);
96
97  int  oop_adjust_pointers(oop obj);
98
99  // Parallel Scavenge and Parallel Old
100  PARALLEL_GC_DECLS
101#ifndef SERIALGC
102  inline void oop_follow_contents(ParCompactionManager* cm, oop obj, int index);
103  template <class T> inline void
104    objarray_follow_contents(ParCompactionManager* cm, oop obj, int index);
105#endif // !SERIALGC
106
107  // Iterators
108  int oop_oop_iterate(oop obj, OopClosure* blk) {
109    return oop_oop_iterate_v(obj, blk);
110  }
111  int oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr) {
112    return oop_oop_iterate_v_m(obj, blk, mr);
113  }
114#define ObjArrayKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix)   \
115  int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk);         \
116  int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk,      \
117                                     MemRegion mr);                     \
118  int oop_oop_iterate_range##nv_suffix(oop obj, OopClosureType* blk,    \
119                                     int start, int end);
120
121  ALL_OOP_OOP_ITERATE_CLOSURES_1(ObjArrayKlass_OOP_OOP_ITERATE_DECL)
122  ALL_OOP_OOP_ITERATE_CLOSURES_2(ObjArrayKlass_OOP_OOP_ITERATE_DECL)
123
124  // JVM support
125  jint compute_modifier_flags(TRAPS) const;
126
127 private:
128   static klassOop array_klass_impl   (objArrayKlassHandle this_oop, bool or_null, int n, TRAPS);
129
130 public:
131  // Printing
132  void oop_print_value_on(oop obj, outputStream* st);
133#ifndef PRODUCT
134  void oop_print_on      (oop obj, outputStream* st);
135#endif //PRODUCT
136
137  // Verification
138  const char* internal_name() const;
139  void oop_verify_on(oop obj, outputStream* st);
140  void oop_verify_old_oop(oop obj, oop* p, bool allow_dirty);
141  void oop_verify_old_oop(oop obj, narrowOop* p, bool allow_dirty);
142};
143