1 /*
2 * Copyright (c) 2003, 2014, 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/verificationType.hpp"
28 #include "classfile/verifier.hpp"
29
30 VerificationType VerificationType::from_tag(u1 tag) {
31 switch (tag) {
32 case ITEM_Top: return bogus_type();
33 case ITEM_Integer: return integer_type();
34 case ITEM_Float: return float_type();
35 case ITEM_Double: return double_type();
36 case ITEM_Long: return long_type();
37 case ITEM_Null: return null_type();
38 default:
39 ShouldNotReachHere();
40 return bogus_type();
41 }
42 }
43
44 bool VerificationType::is_reference_assignable_from(
45 const VerificationType& from, ClassVerifier* context,
46 bool from_field_is_protected, TRAPS) const {
47 instanceKlassHandle klass = context->current_class();
48 if (from.is_null()) {
49 // null is assignable to any reference
50 return true;
51 } else if (is_null()) {
52 return false;
53 } else if (name() == from.name()) {
54 return true;
55 } else if (is_object()) {
56 // We need check the class hierarchy to check assignability
57 if (name() == vmSymbols::java_lang_Object()) {
58 // any object or array is assignable to java.lang.Object
59 return true;
60 }
61 Klass* obj = SystemDictionary::resolve_or_fail(
62 name(), Handle(THREAD, klass->class_loader()),
63 Handle(THREAD, klass->protection_domain()), true, CHECK_false);
64 KlassHandle this_class(THREAD, obj);
65
66 if (this_class->is_interface() && (!from_field_is_protected ||
67 from.name() != vmSymbols::java_lang_Object())) {
68 // If we are not trying to access a protected field or method in
69 // java.lang.Object then we treat interfaces as java.lang.Object,
70 // including java.lang.Cloneable and java.io.Serializable.
71 return true;
72 } else if (from.is_object()) {
73 Klass* from_class = SystemDictionary::resolve_or_fail(
74 from.name(), Handle(THREAD, klass->class_loader()),
75 Handle(THREAD, klass->protection_domain()), true, CHECK_false);
76 return InstanceKlass::cast(from_class)->is_subclass_of(this_class());
77 }
78 } else if (is_array() && from.is_array()) {
79 VerificationType comp_this = get_component(context, CHECK_false);
80 VerificationType comp_from = from.get_component(context, CHECK_false);
81 if (!comp_this.is_bogus() && !comp_from.is_bogus()) {
82 return comp_this.is_assignable_from(comp_from, context,
83 from_field_is_protected, CHECK_false);
84 }
85 }
86 return false;
87 }
88
89 VerificationType VerificationType::get_component(ClassVerifier *context, TRAPS) const {
90 assert(is_array() && name()->utf8_length() >= 2, "Must be a valid array");
91 Symbol* component;
92 switch (name()->byte_at(1)) {
93 case 'Z': return VerificationType(Boolean);
94 case 'B': return VerificationType(Byte);
95 case 'C': return VerificationType(Char);
96 case 'S': return VerificationType(Short);
97 case 'I': return VerificationType(Integer);
98 case 'J': return VerificationType(Long);
99 case 'F': return VerificationType(Float);
100 case 'D': return VerificationType(Double);
101 case '[':
102 component = context->create_temporary_symbol(
103 name(), 1, name()->utf8_length(),
104 CHECK_(VerificationType::bogus_type()));
105 return VerificationType::reference_type(component);
106 case 'L':
107 component = context->create_temporary_symbol(
108 name(), 2, name()->utf8_length() - 1,
109 CHECK_(VerificationType::bogus_type()));
110 return VerificationType::reference_type(component);
111 default:
112 // Met an invalid type signature, e.g. [X
113 return VerificationType::bogus_type();
114 }
115 }
116
117 void VerificationType::print_on(outputStream* st) const {
118 switch (_u._data) {
119 case Bogus: st->print("top"); break;
120 case Category1: st->print("category1"); break;
121 case Category2: st->print("category2"); break;
122 case Category2_2nd: st->print("category2_2nd"); break;
123 case Boolean: st->print("boolean"); break;
124 case Byte: st->print("byte"); break;
125 case Short: st->print("short"); break;
126 case Char: st->print("char"); break;
127 case Integer: st->print("integer"); break;
128 case Float: st->print("float"); break;
129 case Long: st->print("long"); break;
130 case Double: st->print("double"); break;
131 case Long_2nd: st->print("long_2nd"); break;
132 case Double_2nd: st->print("double_2nd"); break;
133 case Null: st->print("null"); break;
134 case ReferenceQuery: st->print("reference type"); break;
135 case Category1Query: st->print("category1 type"); break;
136 case Category2Query: st->print("category2 type"); break;
137 case Category2_2ndQuery: st->print("category2_2nd type"); break;
138 default:
139 if (is_uninitialized_this()) {
140 st->print("uninitializedThis");
141 } else if (is_uninitialized()) {
142 st->print("uninitialized %d", bci());
143 } else {
144 name()->print_value_on(st);
145 }
146 }
147 }