1 /*
2 * Copyright (c) 1997, 2011, 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_ARRAYKLASS_HPP
26 #define SHARE_VM_OOPS_ARRAYKLASS_HPP
27
28 #include "memory/universe.hpp"
29 #include "oops/klass.hpp"
30 #include "oops/klassOop.hpp"
31 #include "oops/klassVtable.hpp"
32
33 // arrayKlass is the abstract baseclass for all array classes
34
35 class arrayKlass: public Klass {
36 friend class VMStructs;
37 private:
38 int _dimension; // This is n'th-dimensional array.
39 volatile klassOop _higher_dimension; // Refers the (n+1)'th-dimensional array (if present).
40 volatile klassOop _lower_dimension; // Refers the (n-1)'th-dimensional array (if present).
41 int _vtable_len; // size of vtable for this klass
42 juint _alloc_size; // allocation profiling support
43 oop _component_mirror; // component type, as a java/lang/Class
44
45 public:
46 // Testing operation
47 bool oop_is_array() const { return true; }
48
49 // Instance variables
50 int dimension() const { return _dimension; }
51 void set_dimension(int dimension) { _dimension = dimension; }
52
53 klassOop higher_dimension() const { return _higher_dimension; }
54 void set_higher_dimension(klassOop k) { oop_store_without_check((oop*) &_higher_dimension, (oop) k); }
55 oop* adr_higher_dimension() { return (oop*)&this->_higher_dimension;}
56
57 klassOop lower_dimension() const { return _lower_dimension; }
58 void set_lower_dimension(klassOop k) { oop_store_without_check((oop*) &_lower_dimension, (oop) k); }
59 oop* adr_lower_dimension() { return (oop*)&this->_lower_dimension;}
60
61 // Allocation profiling support
62 juint alloc_size() const { return _alloc_size; }
63 void set_alloc_size(juint n) { _alloc_size = n; }
64
65 // offset of first element, including any padding for the sake of alignment
66 int array_header_in_bytes() const { return layout_helper_header_size(layout_helper()); }
67 int log2_element_size() const { return layout_helper_log2_element_size(layout_helper()); }
68 // type of elements (T_OBJECT for both oop arrays and array-arrays)
69 BasicType element_type() const { return layout_helper_element_type(layout_helper()); }
70
71 oop component_mirror() const { return _component_mirror; }
72 void set_component_mirror(oop m) { oop_store((oop*) &_component_mirror, m); }
73 oop* adr_component_mirror() { return (oop*)&this->_component_mirror;}
74
75 // Compiler/Interpreter offset
76 static ByteSize component_mirror_offset() { return in_ByteSize(sizeof(klassOopDesc) + offset_of(arrayKlass, _component_mirror)); }
77
78 virtual klassOop java_super() const;//{ return SystemDictionary::Object_klass(); }
79
80 // Allocation
81 // Sizes points to the first dimension of the array, subsequent dimensions
82 // are always in higher memory. The callers of these set that up.
83 virtual oop multi_allocate(int rank, jint* sizes, TRAPS);
84 objArrayOop allocate_arrayArray(int n, int length, TRAPS);
85
86 // Lookup operations
87 methodOop uncached_lookup_method(Symbol* name, Symbol* signature) const;
88
89 // Casting from klassOop
90 static arrayKlass* cast(klassOop k) {
91 Klass* kp = k->klass_part();
92 assert(kp->null_vtbl() || kp->oop_is_array(), "cast to arrayKlass");
93 return (arrayKlass*) kp;
94 }
95
96 objArrayOop compute_secondary_supers(int num_extra_slots, TRAPS);
97 bool compute_is_subtype_of(klassOop k);
98
99 // Sizing
100 static int header_size() { return oopDesc::header_size() + sizeof(arrayKlass)/HeapWordSize; }
101 int object_size(int header_size) const;
102
103 bool object_is_parsable() const { return _vtable_len > 0; }
104
105 // Java vtable
106 klassVtable* vtable() const; // return new klassVtable
107 int vtable_length() const { return _vtable_len; }
108 static int base_vtable_length() { return Universe::base_vtable_size(); }
109 void set_vtable_length(int len) { assert(len == base_vtable_length(), "bad length"); _vtable_len = len; }
110 protected:
111 inline intptr_t* start_of_vtable() const;
112
113 public:
114 // Iterators
115 void array_klasses_do(void f(klassOop k));
116 void with_array_klasses_do(void f(klassOop k));
117
118 // Shared creation method
119 static arrayKlassHandle base_create_array_klass(
120 const Klass_vtbl& vtbl,
121 int header_size, KlassHandle klass,
122 TRAPS);
123 // Return a handle.
124 static void complete_create_array_klass(arrayKlassHandle k, KlassHandle super_klass, TRAPS);
125
126 // jvm support
127 jint compute_modifier_flags(TRAPS) const;
128
129 // JVMTI support
130 jint jvmti_class_status() const;
131
132 // Printing
133 void oop_print_on(oop obj, outputStream* st);
134
135 // Verification
136 void oop_verify_on(oop obj, outputStream* st);
137 };
138
139 #endif // SHARE_VM_OOPS_ARRAYKLASS_HPP