1 /*
2 * Copyright (c) 2003, 2011, 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, TRAPS) const {
46 instanceKlassHandle klass = context->current_class();
47 if (from.is_null()) {
48 // null is assignable to any reference
49 return true;
50 } else if (is_null()) {
51 return false;
52 } else if (name() == from.name()) {
53 return true;
54 } else if (is_object()) {
55 // We need check the class hierarchy to check assignability
56 if (name() == vmSymbols::java_lang_Object()) {
57 // any object or array is assignable to java.lang.Object
58 return true;
59 }
60 klassOop obj = SystemDictionary::resolve_or_fail(
61 name(), Handle(THREAD, klass->class_loader()),
62 Handle(THREAD, klass->protection_domain()), true, CHECK_false);
63 KlassHandle this_class(THREAD, obj);
64
65 if (this_class->is_interface()) {
66 // We treat interfaces as java.lang.Object, including
67 // java.lang.Cloneable and java.io.Serializable
68 return true;
69 } else if (from.is_object()) {
70 klassOop from_class = SystemDictionary::resolve_or_fail(
71 from.name(), Handle(THREAD, klass->class_loader()),
72 Handle(THREAD, klass->protection_domain()), true, CHECK_false);
73 return instanceKlass::cast(from_class)->is_subclass_of(this_class());
74 }
75 } else if (is_array() && from.is_array()) {
76 VerificationType comp_this = get_component(context, CHECK_false);
77 VerificationType comp_from = from.get_component(context, CHECK_false);
78 if (!comp_this.is_bogus() && !comp_from.is_bogus()) {
79 return comp_this.is_assignable_from(comp_from, context, CHECK_false);
80 }
81 }
82 return false;
83 }
84
85 VerificationType VerificationType::get_component(ClassVerifier *context, TRAPS) const {
86 assert(is_array() && name()->utf8_length() >= 2, "Must be a valid array");
87 Symbol* component;
88 switch (name()->byte_at(1)) {
89 case 'Z': return VerificationType(Boolean);
90 case 'B': return VerificationType(Byte);
91 case 'C': return VerificationType(Char);
92 case 'S': return VerificationType(Short);
93 case 'I': return VerificationType(Integer);
94 case 'J': return VerificationType(Long);
95 case 'F': return VerificationType(Float);
96 case 'D': return VerificationType(Double);
97 case '[':
98 component = context->create_temporary_symbol(
99 name(), 1, name()->utf8_length(),
100 CHECK_(VerificationType::bogus_type()));
101 return VerificationType::reference_type(component);
102 case 'L':
103 component = context->create_temporary_symbol(
104 name(), 2, name()->utf8_length() - 1,
105 CHECK_(VerificationType::bogus_type()));
106 return VerificationType::reference_type(component);
107 default:
108 // Met an invalid type signature, e.g. [X
109 return VerificationType::bogus_type();
110 }
111 }
112
113 void VerificationType::print_on(outputStream* st) const {
114 switch (_u._data) {
115 case Bogus: st->print("top"); break;
116 case Category1: st->print("category1"); break;
117 case Category2: st->print("category2"); break;
118 case Category2_2nd: st->print("category2_2nd"); break;
119 case Boolean: st->print("boolean"); break;
120 case Byte: st->print("byte"); break;
121 case Short: st->print("short"); break;
122 case Char: st->print("char"); break;
123 case Integer: st->print("integer"); break;
124 case Float: st->print("float"); break;
125 case Long: st->print("long"); break;
126 case Double: st->print("double"); break;
127 case Long_2nd: st->print("long_2nd"); break;
128 case Double_2nd: st->print("double_2nd"); break;
129 case Null: st->print("null"); break;
130 case ReferenceQuery: st->print("reference type"); break;
131 case Category1Query: st->print("category1 type"); break;
132 case Category2Query: st->print("category2 type"); break;
133 case Category2_2ndQuery: st->print("category2_2nd type"); break;
134 default:
135 if (is_uninitialized_this()) {
136 st->print("uninitializedThis");
137 } else if (is_uninitialized()) {
138 st->print("uninitialized %d", bci());
139 } else {
140 name()->print_value_on(st);
141 }
142 }
143 }