1 /*
2 * Copyright (c) 1999, 2023, 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 #include "precompiled.hpp"
26 #include "ci/ciArrayKlass.hpp"
27 #include "ci/ciFlatArrayKlass.hpp"
28 #include "ci/ciInlineKlass.hpp"
29 #include "ci/ciObjArrayKlass.hpp"
30 #include "ci/ciTypeArrayKlass.hpp"
31 #include "ci/ciUtilities.inline.hpp"
32 #include "oops/inlineKlass.inline.hpp"
33 #include "memory/universe.hpp"
34
35 // ciArrayKlass
36 //
37 // This class represents a Klass* in the HotSpot virtual machine
38 // whose Klass part in an ArrayKlass.
39
40 // ------------------------------------------------------------------
41 // ciArrayKlass::ciArrayKlass
42 //
43 // Loaded array klass.
44 ciArrayKlass::ciArrayKlass(Klass* k) : ciKlass(k) {
45 assert(get_Klass()->is_array_klass(), "wrong type");
46 _dimension = get_ArrayKlass()->dimension();
47 }
48
49 // ------------------------------------------------------------------
50 // ciArrayKlass::ciArrayKlass
51 //
52 // Unloaded array klass.
53 ciArrayKlass::ciArrayKlass(ciSymbol* name, int dimension, BasicType bt)
54 : ciKlass(name, bt) {
55 _dimension = dimension;
56 }
57
58 // ------------------------------------------------------------------
59 // ciArrayKlass::element_type
60 //
61 // What type is obtained when this array is indexed once?
62 ciType* ciArrayKlass::element_type() {
63 if (is_type_array_klass()) {
64 return ciType::make(as_type_array_klass()->element_type());
65 } else {
66 return element_klass()->as_klass();
67 }
68 }
69
70
71 // ------------------------------------------------------------------
72 // ciArrayKlass::base_element_type
73 //
74 // What type is obtained when this array is indexed as many times as possible?
75 ciType* ciArrayKlass::base_element_type() {
76 if (is_type_array_klass()) {
77 return ciType::make(as_type_array_klass()->element_type());
78 } else if (is_obj_array_klass()) {
79 ciKlass* ek = as_obj_array_klass()->base_element_klass();
80 if (ek->is_type_array_klass()) {
81 return ciType::make(ek->as_type_array_klass()->element_type());
82 }
83 return ek;
84 } else {
85 return as_flat_array_klass()->base_element_klass();
86 }
87 }
88
89
90 // ------------------------------------------------------------------
91 // ciArrayKlass::is_leaf_type
92 bool ciArrayKlass::is_leaf_type() {
93 if (is_type_array_klass()) {
94 return true;
95 } else {
96 return as_obj_array_klass()->base_element_klass()->is_leaf_type();
97 }
98 }
99
100
101 // ------------------------------------------------------------------
102 // ciArrayKlass::make
103 //
104 // Make an array klass of the specified element type.
105 ciArrayKlass* ciArrayKlass::make(ciType* element_type, bool null_free) {
106 if (element_type->is_primitive_type()) {
107 return ciTypeArrayKlass::make(element_type->basic_type());
108 }
109
110 ciKlass* klass = element_type->as_klass();
111 assert(!null_free || !klass->is_loaded() || klass->is_inlinetype() || klass->is_abstract() ||
112 klass->is_java_lang_Object(), "only value classes are null free");
113 if (null_free && klass->is_loaded() && klass->is_inlinetype()) {
114 GUARDED_VM_ENTRY(
115 EXCEPTION_CONTEXT;
116 Klass* ak = InlineKlass::cast(klass->get_Klass())->value_array_klass(THREAD);
117 if (HAS_PENDING_EXCEPTION) {
118 CLEAR_PENDING_EXCEPTION;
119 } else if (ak->is_flatArray_klass()) {
120 return CURRENT_THREAD_ENV->get_flat_array_klass(ak);
121 } else if (ak->is_objArray_klass()) {
122 return CURRENT_THREAD_ENV->get_obj_array_klass(ak);
123 }
124 )
125 }
126 return ciObjArrayKlass::make(klass);
127 }
128
129 int ciArrayKlass::array_header_in_bytes() {
130 return get_ArrayKlass()->array_header_in_bytes();
131 }
132
133 ciInstance* ciArrayKlass::component_mirror_instance() const {
134 GUARDED_VM_ENTRY(
135 oop component_mirror = ArrayKlass::cast(get_Klass())->component_mirror();
136 return CURRENT_ENV->get_instance(component_mirror);
137 )
138 }
139