1 /*
2 * Copyright (c) 2003, 2010, 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
29 VerificationType VerificationType::from_tag(u1 tag) {
30 switch (tag) {
31 case ITEM_Top: return bogus_type();
32 case ITEM_Integer: return integer_type();
33 case ITEM_Float: return float_type();
34 case ITEM_Double: return double_type();
35 case ITEM_Long: return long_type();
36 case ITEM_Null: return null_type();
37 default:
38 ShouldNotReachHere();
39 return bogus_type();
40 }
41 }
42
43 bool VerificationType::is_reference_assignable_from(
44 const VerificationType& from, instanceKlassHandle context, TRAPS) const {
45 if (from.is_null()) {
46 // null is assignable to any reference
47 return true;
48 } else if (is_null()) {
49 return false;
50 } else if (name() == from.name()) {
51 return true;
52 } else if (is_object()) {
53 // We need check the class hierarchy to check assignability
54 if (name() == vmSymbols::java_lang_Object()) {
55 // any object or array is assignable to java.lang.Object
56 return true;
57 }
58 klassOop obj = SystemDictionary::resolve_or_fail(
59 name_handle(), Handle(THREAD, context->class_loader()),
60 Handle(THREAD, context->protection_domain()), true, CHECK_false);
61 KlassHandle this_class(THREAD, obj);
62
63 if (this_class->is_interface()) {
64 // We treat interfaces as java.lang.Object, including
65 // java.lang.Cloneable and java.io.Serializable
66 return true;
67 } else if (from.is_object()) {
68 klassOop from_class = SystemDictionary::resolve_or_fail(
69 from.name_handle(), Handle(THREAD, context->class_loader()),
70 Handle(THREAD, context->protection_domain()), true, CHECK_false);
71 return instanceKlass::cast(from_class)->is_subclass_of(this_class());
72 }
73 } else if (is_array() && from.is_array()) {
74 VerificationType comp_this = get_component(CHECK_false);
75 VerificationType comp_from = from.get_component(CHECK_false);
76 if (!comp_this.is_bogus() && !comp_from.is_bogus()) {
77 return comp_this.is_assignable_from(comp_from, context, CHECK_false);
78 }
79 }
80 return false;
81 }
82
83 VerificationType VerificationType::get_component(TRAPS) const {
84 assert(is_array() && name()->utf8_length() >= 2, "Must be a valid array");
85 symbolOop component;
86 switch (name()->byte_at(1)) {
87 case 'Z': return VerificationType(Boolean);
88 case 'B': return VerificationType(Byte);
89 case 'C': return VerificationType(Char);
90 case 'S': return VerificationType(Short);
91 case 'I': return VerificationType(Integer);
92 case 'J': return VerificationType(Long);
93 case 'F': return VerificationType(Float);
94 case 'D': return VerificationType(Double);
95 case '[':
96 component = SymbolTable::lookup(
97 name(), 1, name()->utf8_length(),
98 CHECK_(VerificationType::bogus_type()));
99 return VerificationType::reference_type(component);
100 case 'L':
101 component = SymbolTable::lookup(
102 name(), 2, name()->utf8_length() - 1,
103 CHECK_(VerificationType::bogus_type()));
104 return VerificationType::reference_type(component);
105 default:
106 // Met an invalid type signature, e.g. [X
107 return VerificationType::bogus_type();
108 }
109 }
110
111 #ifndef PRODUCT
112
113 void VerificationType::print_on(outputStream* st) const {
114 switch (_u._data) {
115 case Bogus: st->print(" bogus "); 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 default:
131 if (is_uninitialized_this()) {
132 st->print(" uninitializedThis ");
133 } else if (is_uninitialized()) {
134 st->print(" uninitialized %d ", bci());
135 } else {
136 st->print(" class %s ", name()->as_klass_external_name());
137 }
138 }
139 }
140
141 #endif