1 /*
2 * Copyright (c) 2003, 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 "cds/cdsConfig.hpp"
26 #include "classfile/symbolTable.hpp"
27 #include "classfile/systemDictionary.hpp"
28 #include "classfile/systemDictionaryShared.hpp"
29 #include "classfile/verificationType.hpp"
30 #include "classfile/verifier.hpp"
31 #include "classfile/vmClasses.hpp"
32 #include "classfile/vmSymbols.hpp"
33 #include "logging/log.hpp"
34 #include "oops/klass.inline.hpp"
35 #include "runtime/handles.inline.hpp"
36
37 VerificationType VerificationType::from_tag(u1 tag) {
38 switch (tag) {
39 case ITEM_Top: return bogus_type();
40 case ITEM_Integer: return integer_type();
41 case ITEM_Float: return float_type();
42 case ITEM_Double: return double_type();
43 case ITEM_Long: return long_type();
44 case ITEM_Null: return null_type();
45 default:
46 ShouldNotReachHere();
47 return bogus_type();
48 }
49 }
50
51 bool VerificationType::resolve_and_check_assignability(InstanceKlass* klass, Symbol* name,
52 Symbol* from_name, bool from_field_is_protected, bool from_is_array, bool from_is_object, TRAPS) {
53 HandleMark hm(THREAD);
54 Klass* this_class;
55 if (klass->is_hidden() && klass->name() == name) {
56 this_class = klass;
57 } else {
58 this_class = SystemDictionary::resolve_or_fail(
59 name, Handle(THREAD, klass->class_loader()), true, CHECK_false);
60 if (log_is_enabled(Debug, class, resolve)) {
61 Verifier::trace_class_resolution(this_class, klass);
62 }
63 }
64
65 // Need to do this check when called from CDS.
66 // if (this_class->access_flags().is_primitive_class()) {
67 // Klass* from_class = SystemDictionary::resolve_or_fail(
68 // from_name, Handle(THREAD, klass->class_loader()),
69 // Handle(THREAD, klass->protection_domain()), true, CHECK_false);
70 // return from_class == this_class;
71 // }
72 if (this_class->is_interface() && (!from_field_is_protected ||
73 from_name != vmSymbols::java_lang_Object())) {
74 // If we are not trying to access a protected field or method in
75 // java.lang.Object then, for arrays, we only allow assignability
76 // to interfaces java.lang.Cloneable and java.io.Serializable
77 // Otherwise, we treat interfaces as java.lang.Object.
78 return !from_is_array ||
79 this_class == vmClasses::Cloneable_klass() ||
80 this_class == vmClasses::Serializable_klass();
81 } else if (from_is_object) {
82 Klass* from_class;
83 if (klass->is_hidden() && klass->name() == from_name) {
84 from_class = klass;
85 } else {
86 from_class = SystemDictionary::resolve_or_fail(
87 from_name, Handle(THREAD, klass->class_loader()), true, CHECK_false);
88 if (log_is_enabled(Debug, class, resolve)) {
89 Verifier::trace_class_resolution(from_class, klass);
90 }
91 }
92 return from_class->is_subclass_of(this_class);
93 }
94
95 return false;
96 }
97
98 bool VerificationType::is_reference_assignable_from(
99 const VerificationType& from, ClassVerifier* context,
100 bool from_field_is_protected, TRAPS) const {
101 InstanceKlass* klass = context->current_class();
102 if (from.is_null()) {
103 // null is assignable to any reference
104 return true;
105 } else if (is_null()) {
106 return false;
107 } else if (name() == from.name()) {
108 return true;
109 } else if (is_object()) {
110 // We need check the class hierarchy to check assignability
111 if (name() == vmSymbols::java_lang_Object()) {
112 // any object or array is assignable to java.lang.Object
113 return true;
114 }
115
116 if (CDSConfig::is_dumping_archive()) {
117 if (SystemDictionaryShared::add_verification_constraint(klass,
118 name(), from.name(), from_field_is_protected, from.is_array(),
119 from.is_object())) {
120 // If add_verification_constraint() returns true, the resolution/check should be
121 // delayed until runtime.
122 return true;
123 }
124 }
125
126 return resolve_and_check_assignability(klass, name(), from.name(),
127 from_field_is_protected, from.is_array(), from.is_object(), THREAD);
128 } else if (is_array() && from.is_array()) {
129 VerificationType comp_this = get_component(context);
130 VerificationType comp_from = from.get_component(context);
131
132 if (!comp_this.is_bogus() && !comp_from.is_bogus()) {
133 return comp_this.is_component_assignable_from(comp_from, context,
134 from_field_is_protected, THREAD);
135 }
136 }
137 return false;
138 }
139
140 VerificationType VerificationType::get_component(ClassVerifier *context) const {
141 assert(is_array() && name()->utf8_length() >= 2, "Must be a valid array");
142 SignatureStream ss(name(), false);
143 ss.skip_array_prefix(1);
144 switch (ss.type()) {
145 case T_BOOLEAN: return VerificationType(Boolean);
146 case T_BYTE: return VerificationType(Byte);
147 case T_CHAR: return VerificationType(Char);
148 case T_SHORT: return VerificationType(Short);
149 case T_INT: return VerificationType(Integer);
150 case T_LONG: return VerificationType(Long);
151 case T_FLOAT: return VerificationType(Float);
152 case T_DOUBLE: return VerificationType(Double);
153 case T_ARRAY:
154 case T_OBJECT: {
155 guarantee(ss.is_reference(), "unchecked verifier input?");
156 Symbol* component = ss.as_symbol();
157 // Create another symbol to save as signature stream unreferences this symbol.
158 Symbol* component_copy = context->create_temporary_symbol(component);
159 assert(component_copy == component, "symbols don't match");
160 return VerificationType::reference_type(component_copy);
161 }
162 default:
163 // Met an invalid type signature, e.g. [X
164 return VerificationType::bogus_type();
165 }
166 }
167
168 void VerificationType::print_on(outputStream* st) const {
169 switch (_u._data) {
170 case Bogus: st->print("top"); break;
171 case Category1: st->print("category1"); break;
172 case Category2: st->print("category2"); break;
173 case Category2_2nd: st->print("category2_2nd"); break;
174 case Boolean: st->print("boolean"); break;
175 case Byte: st->print("byte"); break;
176 case Short: st->print("short"); break;
177 case Char: st->print("char"); break;
178 case Integer: st->print("integer"); break;
179 case Float: st->print("float"); break;
180 case Long: st->print("long"); break;
181 case Double: st->print("double"); break;
182 case Long_2nd: st->print("long_2nd"); break;
183 case Double_2nd: st->print("double_2nd"); break;
184 case Null: st->print("null"); break;
185 case ReferenceQuery: st->print("reference type"); break;
186 case Category1Query: st->print("category1 type"); break;
187 case Category2Query: st->print("category2 type"); break;
188 case Category2_2ndQuery: st->print("category2_2nd type"); break;
189 default:
190 if (is_uninitialized_this()) {
191 st->print("uninitializedThis");
192 } else if (is_uninitialized()) {
193 st->print("uninitialized %d", bci());
194 } else {
195 if (name() != nullptr) {
196 name()->print_value_on(st);
197 } else {
198 st->print_cr("null");
199 }
200 }
201 }
202 }