arrayKlass.hpp revision 0:a61af66fc99e 
1/*
2 * Copyright 1997-2007 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25// arrayKlass is the abstract baseclass for all array classes
26
27class arrayKlass: public Klass {
28  friend class VMStructs;
29 private:
30  int      _dimension;         // This is n'th-dimensional array.
31  klassOop _higher_dimension;  // Refers the (n+1)'th-dimensional array (if present).
32  klassOop _lower_dimension;   // Refers the (n-1)'th-dimensional array (if present).
33  int      _vtable_len;        // size of vtable for this klass
34  juint    _alloc_size;        // allocation profiling support
35  oop      _component_mirror;  // component type, as a java/lang/Class
36
37 public:
38  // Testing operation
39  bool oop_is_array() const { return true; }
40
41  // Instance variables
42  int dimension() const                 { return _dimension;      }
43  void set_dimension(int dimension)     { _dimension = dimension; }
44
45  klassOop higher_dimension() const     { return _higher_dimension; }
46  void set_higher_dimension(klassOop k) { oop_store_without_check((oop*) &_higher_dimension, (oop) k); }
47  oop* adr_higher_dimension()           { return (oop*)&this->_higher_dimension;}
48
49  klassOop lower_dimension() const      { return _lower_dimension; }
50  void set_lower_dimension(klassOop k)  { oop_store_without_check((oop*) &_lower_dimension, (oop) k); }
51  oop* adr_lower_dimension()            { return (oop*)&this->_lower_dimension;}
52
53  // Allocation profiling support
54  juint alloc_size() const              { return _alloc_size; }
55  void set_alloc_size(juint n)          { _alloc_size = n; }
56
57  // offset of first element, including any padding for the sake of alignment
58  int  array_header_in_bytes() const    { return layout_helper_header_size(layout_helper()); }
59  int  log2_element_size() const        { return layout_helper_log2_element_size(layout_helper()); }
60  // type of elements (T_OBJECT for both oop arrays and array-arrays)
61  BasicType element_type() const        { return layout_helper_element_type(layout_helper()); }
62
63  oop  component_mirror() const         { return _component_mirror; }
64  void set_component_mirror(oop m)      { oop_store((oop*) &_component_mirror, m); }
65  oop* adr_component_mirror()           { return (oop*)&this->_component_mirror;}
66
67  // Compiler/Interpreter offset
68  static ByteSize component_mirror_offset() { return byte_offset_of(arrayKlass, _component_mirror); }
69
70  virtual klassOop java_super() const;//{ return SystemDictionary::object_klass(); }
71
72  // Allocation
73  // Sizes points to the first dimension of the array, subsequent dimensions
74  // are always in higher memory.  The callers of these set that up.
75  virtual oop multi_allocate(int rank, jint* sizes, TRAPS);
76  objArrayOop allocate_arrayArray(int n, int length, TRAPS);
77
78  // Lookup operations
79  methodOop uncached_lookup_method(symbolOop name, symbolOop signature) const;
80
81  // Casting from klassOop
82  static arrayKlass* cast(klassOop k) {
83    Klass* kp = k->klass_part();
84    assert(kp->null_vtbl() || kp->oop_is_array(), "cast to arrayKlass");
85    return (arrayKlass*) kp;
86  }
87
88  objArrayOop compute_secondary_supers(int num_extra_slots, TRAPS);
89  bool compute_is_subtype_of(klassOop k);
90
91  // Sizing
92  static int header_size()                 { return oopDesc::header_size() + sizeof(arrayKlass)/HeapWordSize; }
93  int object_size(int header_size) const;
94
95  bool object_is_parsable() const          { return _vtable_len > 0; }
96
97  // Java vtable
98  klassVtable* vtable() const;             // return new klassVtable
99  int  vtable_length() const               { return _vtable_len; }
100  static int base_vtable_length()          { return Universe::base_vtable_size(); }
101  void set_vtable_length(int len)          { assert(len == base_vtable_length(), "bad length"); _vtable_len = len; }
102 protected:
103  inline intptr_t* start_of_vtable() const;
104
105 public:
106  // Iterators
107  void array_klasses_do(void f(klassOop k));
108  void with_array_klasses_do(void f(klassOop k));
109
110  // Shared creation method
111  static arrayKlassHandle base_create_array_klass(
112                                          const Klass_vtbl& vtbl,
113                                          int header_size, KlassHandle klass,
114                                          TRAPS);
115  // Return a handle.
116  static void     complete_create_array_klass(arrayKlassHandle k, KlassHandle super_klass, TRAPS);
117
118 public:
119   // jvm support
120   jint compute_modifier_flags(TRAPS) const;
121
122 public:
123   // JVMTI support
124   jint jvmti_class_status() const;
125
126#ifndef PRODUCT
127 public:
128  // Printing
129  void oop_print_on(oop obj, outputStream* st);
130#endif
131 public:
132  // Verification
133  void oop_verify_on(oop obj, outputStream* st);
134};
135