1 /*
2 * Copyright (c) 2003, 2006, 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 "incls/_precompiled.incl"
26 # include "incls/_verificationType.cpp.incl"
27
28 VerificationType VerificationType::from_tag(u1 tag) {
29 switch (tag) {
30 case ITEM_Top: return bogus_type();
31 case ITEM_Integer: return integer_type();
32 case ITEM_Float: return float_type();
33 case ITEM_Double: return double_type();
34 case ITEM_Long: return long_type();
35 case ITEM_Null: return null_type();
36 default:
37 ShouldNotReachHere();
38 return bogus_type();
39 }
40 }
41
42 bool VerificationType::is_reference_assignable_from(
43 const VerificationType& from, instanceKlassHandle context, TRAPS) const {
44 if (from.is_null()) {
45 // null is assignable to any reference
46 return true;
47 } else if (is_null()) {
48 return false;
49 } else if (name() == from.name()) {
50 return true;
51 } else if (is_object()) {
52 // We need check the class hierarchy to check assignability
53 if (name() == vmSymbols::java_lang_Object()) {
54 // any object or array is assignable to java.lang.Object
55 return true;
56 }
57 klassOop obj = SystemDictionary::resolve_or_fail(
58 name_handle(), Handle(THREAD, context->class_loader()),
59 Handle(THREAD, context->protection_domain()), true, CHECK_false);
60 KlassHandle this_class(THREAD, obj);
61
62 if (this_class->is_interface()) {
63 // We treat interfaces as java.lang.Object, including
64 // java.lang.Cloneable and java.io.Serializable
65 return true;
66 } else if (from.is_object()) {
67 klassOop from_class = SystemDictionary::resolve_or_fail(
68 from.name_handle(), Handle(THREAD, context->class_loader()),
69 Handle(THREAD, context->protection_domain()), true, CHECK_false);
70 return instanceKlass::cast(from_class)->is_subclass_of(this_class());
71 }
72 } else if (is_array() && from.is_array()) {
73 VerificationType comp_this = get_component(CHECK_false);
74 VerificationType comp_from = from.get_component(CHECK_false);
75 if (!comp_this.is_bogus() && !comp_from.is_bogus()) {
76 return comp_this.is_assignable_from(comp_from, context, CHECK_false);
77 }
78 }
79 return false;
80 }
81
82 VerificationType VerificationType::get_component(TRAPS) const {
83 assert(is_array() && name()->utf8_length() >= 2, "Must be a valid array");
84 symbolOop component;
85 switch (name()->byte_at(1)) {
86 case 'Z': return VerificationType(Boolean);
87 case 'B': return VerificationType(Byte);
88 case 'C': return VerificationType(Char);
89 case 'S': return VerificationType(Short);
90 case 'I': return VerificationType(Integer);
91 case 'J': return VerificationType(Long);
92 case 'F': return VerificationType(Float);
93 case 'D': return VerificationType(Double);
94 case '[':
95 component = SymbolTable::lookup(
96 name(), 1, name()->utf8_length(),
97 CHECK_(VerificationType::bogus_type()));
98 return VerificationType::reference_type(component);
99 case 'L':
100 component = SymbolTable::lookup(
101 name(), 2, name()->utf8_length() - 1,
102 CHECK_(VerificationType::bogus_type()));
103 return VerificationType::reference_type(component);
104 default:
105 // Met an invalid type signature, e.g. [X
106 return VerificationType::bogus_type();
107 }
108 }
109
110 #ifndef PRODUCT
111
112 void VerificationType::print_on(outputStream* st) const {
113 switch (_u._data) {
114 case Bogus: st->print(" bogus "); break;
115 case Category1: st->print(" category1 "); break;
116 case Category2: st->print(" category2 "); break;
117 case Category2_2nd: st->print(" category2_2nd "); break;
118 case Boolean: st->print(" boolean "); break;
119 case Byte: st->print(" byte "); break;
120 case Short: st->print(" short "); break;
121 case Char: st->print(" char "); break;
122 case Integer: st->print(" integer "); break;
123 case Float: st->print(" float "); break;
124 case Long: st->print(" long "); break;
125 case Double: st->print(" double "); break;
126 case Long_2nd: st->print(" long_2nd "); break;
127 case Double_2nd: st->print(" double_2nd "); break;
128 case Null: st->print(" null "); break;
129 default:
130 if (is_uninitialized_this()) {
131 st->print(" uninitializedThis ");
132 } else if (is_uninitialized()) {
133 st->print(" uninitialized %d ", bci());
134 } else {
135 st->print(" class %s ", name()->as_klass_external_name());
136 }
137 }
138 }
139
140 #endif