1 /*
2 * Copyright (c) 2003, 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 "cds/cdsConfig.hpp"
27 #include "classfile/symbolTable.hpp"
28 #include "classfile/systemDictionary.hpp"
29 #include "classfile/systemDictionaryShared.hpp"
30 #include "classfile/verificationType.hpp"
31 #include "classfile/verifier.hpp"
32 #include "classfile/vmClasses.hpp"
33 #include "classfile/vmSymbols.hpp"
34 #include "logging/log.hpp"
35 #include "oops/klass.inline.hpp"
36 #include "runtime/handles.inline.hpp"
37
38 VerificationType VerificationType::from_tag(u1 tag) {
39 switch (tag) {
40 case ITEM_Top: return bogus_type();
41 case ITEM_Integer: return integer_type();
42 case ITEM_Float: return float_type();
43 case ITEM_Double: return double_type();
44 case ITEM_Long: return long_type();
45 case ITEM_Null: return null_type();
46 default:
47 ShouldNotReachHere();
48 return bogus_type();
49 }
50 }
51
52 bool VerificationType::resolve_and_check_assignability(InstanceKlass* klass, Symbol* name,
53 Symbol* from_name, bool from_field_is_protected, bool from_is_array, bool from_is_object, TRAPS) {
54 HandleMark hm(THREAD);
55 Klass* this_class;
56 if (klass->is_hidden() && klass->name() == name) {
57 this_class = klass;
58 } else {
59 this_class = SystemDictionary::resolve_or_fail(
60 name, Handle(THREAD, klass->class_loader()),
61 Handle(THREAD, klass->protection_domain()), true, CHECK_false);
62 if (log_is_enabled(Debug, class, resolve)) {
63 Verifier::trace_class_resolution(this_class, klass);
64 }
65 }
66
67 // Need to do this check when called from CDS.
68 // if (this_class->access_flags().is_primitive_class()) {
69 // Klass* from_class = SystemDictionary::resolve_or_fail(
70 // from_name, Handle(THREAD, klass->class_loader()),
71 // Handle(THREAD, klass->protection_domain()), true, CHECK_false);
72 // return from_class == this_class;
73 // }
74 if (this_class->is_interface() && (!from_field_is_protected ||
75 from_name != vmSymbols::java_lang_Object())) {
76 // If we are not trying to access a protected field or method in
77 // java.lang.Object then, for arrays, we only allow assignability
78 // to interfaces java.lang.Cloneable and java.io.Serializable
79 // Otherwise, we treat interfaces as java.lang.Object.
80 return !from_is_array ||
81 this_class == vmClasses::Cloneable_klass() ||
82 this_class == vmClasses::Serializable_klass();
83 } else if (from_is_object) {
84 Klass* from_class;
85 if (klass->is_hidden() && klass->name() == from_name) {
86 from_class = klass;
87 } else {
88 from_class = SystemDictionary::resolve_or_fail(
89 from_name, Handle(THREAD, klass->class_loader()),
90 Handle(THREAD, klass->protection_domain()), true, CHECK_false);
91 if (log_is_enabled(Debug, class, resolve)) {
92 Verifier::trace_class_resolution(from_class, klass);
93 }
94 }
95 return from_class->is_subclass_of(this_class);
96 }
97
98 return false;
99 }
100
101 bool VerificationType::is_reference_assignable_from(
102 const VerificationType& from, ClassVerifier* context,
103 bool from_field_is_protected, TRAPS) const {
104 InstanceKlass* klass = context->current_class();
105 if (from.is_null()) {
106 // null is assignable to any reference
107 return true;
108 } else if (is_null()) {
109 return false;
110 } else if (name() == from.name()) {
111 return true;
112 } else if (is_object()) {
113 // We need check the class hierarchy to check assignability
114 if (name() == vmSymbols::java_lang_Object()) {
115 // any object or array is assignable to java.lang.Object
116 return true;
117 }
118
119 if (CDSConfig::is_dumping_archive()) {
120 if (SystemDictionaryShared::add_verification_constraint(klass,
121 name(), from.name(), from_field_is_protected, from.is_array(),
122 from.is_object())) {
123 // If add_verification_constraint() returns true, the resolution/check should be
124 // delayed until runtime.
125 return true;
126 }
127 }
128
129 return resolve_and_check_assignability(klass, name(), from.name(),
130 from_field_is_protected, from.is_array(), from.is_object(), THREAD);
131 } else if (is_array() && from.is_array()) {
132 VerificationType comp_this = get_component(context);
133 VerificationType comp_from = from.get_component(context);
134
135 /*
136 // This code implements non-covariance between inline type arrays and both
137 // arrays of objects and arrays of interface types. If covariance is
138 // supported for inline type arrays then this code should be removed.
139 if (comp_from.is_inline_type() && !comp_this.is_null() && comp_this.is_reference()) {
140 // An array of inline types is not assignable to an array of java.lang.Objects.
141 if (comp_this.name() == vmSymbols::java_lang_Object()) {
142 return false;
143 }
144
145 // Need to load 'comp_this' to see if it is an interface.
146 InstanceKlass* klass = context->current_class();
147 {
148 HandleMark hm(THREAD);
149 Klass* comp_this_class = SystemDictionary::resolve_or_fail(
150 comp_this.name(), Handle(THREAD, klass->class_loader()),
151 Handle(THREAD, klass->protection_domain()), true, CHECK_false);
152 klass->class_loader_data()->record_dependency(comp_this_class);
153 if (log_is_enabled(Debug, class, resolve)) {
154 Verifier::trace_class_resolution(comp_this_class, klass);
155 }
156 // An array of inline types is not assignable to an array of interface types.
157 if (comp_this_class->is_interface()) {
158 return false;
159 }
160 }
161 }
162 */
163 if (!comp_this.is_bogus() && !comp_from.is_bogus()) {
164 return comp_this.is_component_assignable_from(comp_from, context,
165 from_field_is_protected, THREAD);
166 }
167 }
168 return false;
169 }
170
171 bool VerificationType::is_inline_type_assignable_from(const VerificationType& from) const {
172 // Check that 'from' is not null, is an inline type, and is the same inline type.
173 assert(is_inline_type(), "called with a non-inline type");
174 assert(!is_null(), "inline type is not null");
175 return (!from.is_null() && from.is_inline_type() && name() == from.name());
176 }
177
178 bool VerificationType::is_ref_assignable_from_inline_type(const VerificationType& from, ClassVerifier* context, TRAPS) const {
179 assert(!from.is_null(), "Inline type should not be null");
180 if (!is_null() && (name()->is_same_fundamental_type(from.name()) ||
181 name() == vmSymbols::java_lang_Object())) {
182 return true;
183 }
184
185 // Need to load 'this' to see if it is an interface or supertype.
186 InstanceKlass* klass = context->current_class();
187 {
188 HandleMark hm(THREAD);
189 Klass* this_class = SystemDictionary::resolve_or_fail(
190 name(), Handle(THREAD, klass->class_loader()),
191 Handle(THREAD, klass->protection_domain()), true, CHECK_false);
192 klass->class_loader_data()->record_dependency(this_class);
193 if (log_is_enabled(Debug, class, resolve)) {
194 Verifier::trace_class_resolution(this_class, klass);
195 }
196 if (this_class->is_interface()) {
197 return true;
198 } else {
199 Klass* from_class = SystemDictionary::resolve_or_fail(
200 from.name(), Handle(THREAD, klass->class_loader()),
201 Handle(THREAD, klass->protection_domain()), true, CHECK_false);
202 if (log_is_enabled(Debug, class, resolve)) {
203 Verifier::trace_class_resolution(from_class, klass);
204 }
205 return from_class->is_subclass_of(this_class);
206 }
207 }
208 }
209
210 VerificationType VerificationType::get_component(ClassVerifier *context) const {
211 assert(is_array() && name()->utf8_length() >= 2, "Must be a valid array");
212 SignatureStream ss(name(), false);
213 ss.skip_array_prefix(1);
214 switch (ss.type()) {
215 case T_BOOLEAN: return VerificationType(Boolean);
216 case T_BYTE: return VerificationType(Byte);
217 case T_CHAR: return VerificationType(Char);
218 case T_SHORT: return VerificationType(Short);
219 case T_INT: return VerificationType(Integer);
220 case T_LONG: return VerificationType(Long);
221 case T_FLOAT: return VerificationType(Float);
222 case T_DOUBLE: return VerificationType(Double);
223 case T_ARRAY:
224 case T_OBJECT: {
225 guarantee(ss.is_reference(), "unchecked verifier input?");
226 Symbol* component = ss.as_symbol();
227 // Create another symbol to save as signature stream unreferences this symbol.
228 Symbol* component_copy = context->create_temporary_symbol(component);
229 assert(component_copy == component, "symbols don't match");
230 return VerificationType::reference_type(component_copy);
231 }
232 default:
233 // Met an invalid type signature, e.g. [X
234 return VerificationType::bogus_type();
235 }
236 }
237
238 void VerificationType::print_on(outputStream* st) const {
239 switch (_u._data) {
240 case Bogus: st->print("top"); break;
241 case Category1: st->print("category1"); break;
242 case Category2: st->print("category2"); break;
243 case Category2_2nd: st->print("category2_2nd"); break;
244 case Boolean: st->print("boolean"); break;
245 case Byte: st->print("byte"); break;
246 case Short: st->print("short"); break;
247 case Char: st->print("char"); break;
248 case Integer: st->print("integer"); break;
249 case Float: st->print("float"); break;
250 case Long: st->print("long"); break;
251 case Double: st->print("double"); break;
252 case Long_2nd: st->print("long_2nd"); break;
253 case Double_2nd: st->print("double_2nd"); break;
254 case Null: st->print("null"); break;
255 case ReferenceQuery: st->print("reference type"); break;
256 case InlineTypeQuery: st->print("inline type"); break;
257 case NonScalarQuery: st->print("reference or inline type"); break;
258 case Category1Query: st->print("category1 type"); break;
259 case Category2Query: st->print("category2 type"); break;
260 case Category2_2ndQuery: st->print("category2_2nd type"); break;
261 default:
262 if (is_uninitialized_this()) {
263 st->print("uninitializedThis");
264 } else if (is_uninitialized()) {
265 st->print("uninitialized %d", bci());
266 } else {
267 if (name() != nullptr) {
268 name()->print_value_on(st);
269 } else {
270 st->print_cr("null");
271 }
272 }
273 }
274 }