1 /*
2 * Copyright (c) 2003, 2020, 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 "classfile/symbolTable.hpp"
27 #include "classfile/systemDictionaryShared.hpp"
28 #include "classfile/verificationType.hpp"
29 #include "classfile/verifier.hpp"
30 #include "logging/log.hpp"
31 #include "oops/klass.inline.hpp"
32 #include "runtime/handles.inline.hpp"
33
34 VerificationType VerificationType::from_tag(u1 tag) {
35 switch (tag) {
36 case ITEM_Top: return bogus_type();
37 case ITEM_Integer: return integer_type();
38 case ITEM_Float: return float_type();
39 case ITEM_Double: return double_type();
40 case ITEM_Long: return long_type();
41 case ITEM_Null: return null_type();
42 default:
43 ShouldNotReachHere();
44 return bogus_type();
45 }
46 }
47
48 bool VerificationType::resolve_and_check_assignability(InstanceKlass* klass, Symbol* name,
49 Symbol* from_name, bool from_field_is_protected, bool from_is_array, bool from_is_object, TRAPS) {
50 HandleMark hm(THREAD);
51 Klass* this_class = SystemDictionary::resolve_or_fail(
52 name, Handle(THREAD, klass->class_loader()),
53 Handle(THREAD, klass->protection_domain()), true, CHECK_false);
54 if (log_is_enabled(Debug, class, resolve)) {
55 Verifier::trace_class_resolution(this_class, klass);
56 }
57
58 if (this_class->is_interface() && (!from_field_is_protected ||
59 from_name != vmSymbols::java_lang_Object())) {
60 // If we are not trying to access a protected field or method in
61 // java.lang.Object then, for arrays, we only allow assignability
62 // to interfaces java.lang.Cloneable and java.io.Serializable.
63 // Otherwise, we treat interfaces as java.lang.Object.
64 return !from_is_array ||
65 this_class == SystemDictionary::Cloneable_klass() ||
66 this_class == SystemDictionary::Serializable_klass();
67 } else if (from_is_object) {
68 Klass* from_class = SystemDictionary::resolve_or_fail(
69 from_name, Handle(THREAD, klass->class_loader()),
70 Handle(THREAD, klass->protection_domain()), true, CHECK_false);
71 if (log_is_enabled(Debug, class, resolve)) {
72 Verifier::trace_class_resolution(from_class, klass);
73 }
74 return from_class->is_subclass_of(this_class);
75 }
76
77 return false;
78 }
79
80 bool VerificationType::is_reference_assignable_from(
81 const VerificationType& from, ClassVerifier* context,
82 bool from_field_is_protected, TRAPS) const {
83 InstanceKlass* klass = context->current_class();
84 if (from.is_null()) {
85 // null is assignable to any reference
86 return true;
87 } else if (is_null()) {
88 return false;
89 } else if (name() == from.name()) {
90 return true;
91 } else if (is_object()) {
92 // We need check the class hierarchy to check assignability
93 if (name() == vmSymbols::java_lang_Object()) {
94 // any object or array is assignable to java.lang.Object
95 return true;
96 }
97
98 if (Arguments::is_dumping_archive()) {
99 if (SystemDictionaryShared::add_verification_constraint(klass,
100 name(), from.name(), from_field_is_protected, from.is_array(),
101 from.is_object())) {
102 // If add_verification_constraint() returns true, the resolution/check should be
103 // delayed until runtime.
104 return true;
105 }
106 }
107
108 return resolve_and_check_assignability(klass, name(), from.name(),
109 from_field_is_protected, from.is_array(), from.is_object(), THREAD);
110 } else if (is_array() && from.is_array()) {
111 VerificationType comp_this = get_component(context, CHECK_false);
112 VerificationType comp_from = from.get_component(context, CHECK_false);
113 if (!comp_this.is_bogus() && !comp_from.is_bogus()) {
114 return comp_this.is_component_assignable_from(comp_from, context,
115 from_field_is_protected, THREAD);
116 }
117 }
118 return false;
119 }
120
121 VerificationType VerificationType::get_component(ClassVerifier *context, TRAPS) const {
122 assert(is_array() && name()->utf8_length() >= 2, "Must be a valid array");
123 SignatureStream ss(name(), false);
124 ss.skip_array_prefix(1);
125 switch (ss.type()) {
126 case T_BOOLEAN: return VerificationType(Boolean);
127 case T_BYTE: return VerificationType(Byte);
128 case T_CHAR: return VerificationType(Char);
129 case T_SHORT: return VerificationType(Short);
130 case T_INT: return VerificationType(Integer);
131 case T_LONG: return VerificationType(Long);
132 case T_FLOAT: return VerificationType(Float);
133 case T_DOUBLE: return VerificationType(Double);
134 case T_ARRAY:
135 case T_OBJECT: {
136 guarantee(ss.is_reference(), "unchecked verifier input?");
137 Symbol* component = ss.as_symbol();
138 // Create another symbol to save as signature stream unreferences this symbol.
139 Symbol* component_copy = context->create_temporary_symbol(component);
140 assert(component_copy == component, "symbols don't match");
141 return VerificationType::reference_type(component_copy);
142 }
143 default:
144 // Met an invalid type signature, e.g. [X
145 return VerificationType::bogus_type();
146 }
147 }
148
149 void VerificationType::print_on(outputStream* st) const {
150 switch (_u._data) {
151 case Bogus: st->print("top"); break;
152 case Category1: st->print("category1"); break;
153 case Category2: st->print("category2"); break;
154 case Category2_2nd: st->print("category2_2nd"); break;
155 case Boolean: st->print("boolean"); break;
156 case Byte: st->print("byte"); break;
157 case Short: st->print("short"); break;
158 case Char: st->print("char"); break;
159 case Integer: st->print("integer"); break;
160 case Float: st->print("float"); break;
161 case Long: st->print("long"); break;
162 case Double: st->print("double"); break;
163 case Long_2nd: st->print("long_2nd"); break;
164 case Double_2nd: st->print("double_2nd"); break;
165 case Null: st->print("null"); break;
166 case ReferenceQuery: st->print("reference type"); break;
167 case Category1Query: st->print("category1 type"); break;
168 case Category2Query: st->print("category2 type"); break;
169 case Category2_2ndQuery: st->print("category2_2nd type"); break;
170 default:
171 if (is_uninitialized_this()) {
172 st->print("uninitializedThis");
173 } else if (is_uninitialized()) {
174 st->print("uninitialized %d", bci());
175 } else {
176 if (name() != NULL) {
177 name()->print_value_on(st);
178 } else {
179 st->print_cr("NULL");
180 }
181 }
182 }
183 }