1 /*
2 * Copyright (c) 1999, 2025, 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 "ci/ciConstant.hpp"
26 #include "ci/ciField.hpp"
27 #include "ci/ciInstance.hpp"
28 #include "ci/ciInstanceKlass.hpp"
29 #include "ci/ciNullObject.hpp"
30 #include "ci/ciUtilities.inline.hpp"
31 #include "classfile/javaClasses.inline.hpp"
32 #include "classfile/vmClasses.hpp"
33 #include "oops/oop.inline.hpp"
34
35 // ciInstance
36 //
37 // This class represents an instanceOop in the HotSpot virtual
38 // machine.
39
40 // ------------------------------------------------------------------
41 // ciObject::java_mirror_type
42 ciType* ciInstance::java_mirror_type() {
43 VM_ENTRY_MARK;
44 oop m = get_oop();
45 // Return null if it is not java.lang.Class.
46 if (m == nullptr || m->klass() != vmClasses::Class_klass()) {
83 // a non-null reference to an instance of a particular class,
84 // or to a particular array. This can happen even if the instance
85 // or array is not perm. In such a case, an "unloaded" ciArray
86 // or ciInstance is created. The compiler may be able to use
87 // information about the object's class (which is exact) or length.
88
89 if (o == nullptr) {
90 value = ciConstant(field_btype, ciNullObject::make());
91 } else {
92 value = ciConstant(field_btype, CURRENT_ENV->get_object(o));
93 }
94 break;
95 }
96 default:
97 fatal("no field value: %s", type2name(field_btype));
98 }
99 add_to_constant_value_cache(offset, value);
100 return value;
101 }
102
103 // ------------------------------------------------------------------
104 // ciInstance::field_value
105 //
106 // Constant value of a field.
107 ciConstant ciInstance::field_value(ciField* field) {
108 assert(is_loaded(), "invalid access - must be loaded");
109 assert(field->holder()->is_loaded(), "invalid access - holder must be loaded");
110 assert(field->is_static() || klass()->is_subclass_of(field->holder()), "invalid access - must be subclass");
111 return field_value_impl(field->type()->basic_type(), field->offset_in_bytes());
112 }
113
114 // ------------------------------------------------------------------
115 // ciInstance::field_value_by_offset
116 //
117 // Constant value of a field at the specified offset.
118 ciConstant ciInstance::field_value_by_offset(int field_offset) {
119 ciInstanceKlass* ik = klass()->as_instance_klass();
120 ciField* field = ik->get_field_by_offset(field_offset, false);
121 if (field == nullptr)
122 return ciConstant(); // T_ILLEGAL
123 return field_value(field);
124 }
125
126 // ------------------------------------------------------------------
127 // ciInstance::print_impl
128 //
129 // Implementation of the print method.
130 void ciInstance::print_impl(outputStream* st) {
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1 /*
2 * Copyright (c) 1999, 2026, 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 "ci/ciConstant.hpp"
26 #include "ci/ciField.hpp"
27 #include "ci/ciInlineKlass.hpp"
28 #include "ci/ciInstance.hpp"
29 #include "ci/ciInstanceKlass.hpp"
30 #include "ci/ciNullObject.hpp"
31 #include "ci/ciUtilities.inline.hpp"
32 #include "classfile/javaClasses.inline.hpp"
33 #include "classfile/vmClasses.hpp"
34 #include "oops/oop.inline.hpp"
35
36 // ciInstance
37 //
38 // This class represents an instanceOop in the HotSpot virtual
39 // machine.
40
41 // ------------------------------------------------------------------
42 // ciObject::java_mirror_type
43 ciType* ciInstance::java_mirror_type() {
44 VM_ENTRY_MARK;
45 oop m = get_oop();
46 // Return null if it is not java.lang.Class.
47 if (m == nullptr || m->klass() != vmClasses::Class_klass()) {
84 // a non-null reference to an instance of a particular class,
85 // or to a particular array. This can happen even if the instance
86 // or array is not perm. In such a case, an "unloaded" ciArray
87 // or ciInstance is created. The compiler may be able to use
88 // information about the object's class (which is exact) or length.
89
90 if (o == nullptr) {
91 value = ciConstant(field_btype, ciNullObject::make());
92 } else {
93 value = ciConstant(field_btype, CURRENT_ENV->get_object(o));
94 }
95 break;
96 }
97 default:
98 fatal("no field value: %s", type2name(field_btype));
99 }
100 add_to_constant_value_cache(offset, value);
101 return value;
102 }
103
104 // Constant value of the null marker.
105 ciConstant ciInstance::null_marker_value() {
106 if (!klass()->is_inlinetype()) {
107 return ciConstant();
108 }
109 ciInlineKlass* ik = klass()->as_inline_klass();
110 return field_value_impl(T_BOOLEAN, ik->null_marker_offset_in_payload() + ik->payload_offset());
111 }
112
113 // ------------------------------------------------------------------
114 // ciInstance::field_value
115 //
116 // Constant value of a field.
117 ciConstant ciInstance::field_value(ciField* field) {
118 assert(is_loaded(), "invalid access - must be loaded");
119 assert(field->holder()->is_loaded(), "invalid access - holder must be loaded");
120 assert(field->is_static() || field->holder()->is_inlinetype() || klass()->is_subclass_of(field->holder()),
121 "invalid access - must be subclass");
122
123 return field_value_impl(field->type()->basic_type(), field->offset_in_bytes());
124 }
125
126 // ------------------------------------------------------------------
127 // ciInstance::field_value_by_offset
128 //
129 // Constant value of a field at the specified offset.
130 ciConstant ciInstance::field_value_by_offset(int field_offset) {
131 ciInstanceKlass* ik = klass()->as_instance_klass();
132 ciField* field = ik->get_field_by_offset(field_offset, false);
133 if (field == nullptr)
134 return ciConstant(); // T_ILLEGAL
135 return field_value(field);
136 }
137
138 // ------------------------------------------------------------------
139 // ciInstance::print_impl
140 //
141 // Implementation of the print method.
142 void ciInstance::print_impl(outputStream* st) {
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