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comparison src/share/vm/classfile/verificationType.cpp @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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children c18cbe5936b8
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-1:000000000000 0:a61af66fc99e
1 /*
2 * Copyright 2003-2006 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any 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 this_class = SystemDictionary::resolve_or_fail(
58 name_handle(), Handle(THREAD, context->class_loader()),
59 Handle(THREAD, context->protection_domain()), true, CHECK_false);
60 if (this_class->klass_part()->is_interface()) {
61 // We treat interfaces as java.lang.Object, including
62 // java.lang.Cloneable and java.io.Serializable
63 return true;
64 } else if (from.is_object()) {
65 klassOop from_class = SystemDictionary::resolve_or_fail(
66 from.name_handle(), Handle(THREAD, context->class_loader()),
67 Handle(THREAD, context->protection_domain()), true, CHECK_false);
68 return instanceKlass::cast(from_class)->is_subclass_of(this_class);
69 }
70 } else if (is_array() && from.is_array()) {
71 VerificationType comp_this = get_component(CHECK_false);
72 VerificationType comp_from = from.get_component(CHECK_false);
73 return comp_this.is_assignable_from(comp_from, context, CHECK_false);
74 }
75 return false;
76 }
77
78 VerificationType VerificationType::get_component(TRAPS) const {
79 assert(is_array() && name()->utf8_length() >= 2, "Must be a valid array");
80 symbolOop component;
81 switch (name()->byte_at(1)) {
82 case 'Z': return VerificationType(Boolean);
83 case 'B': return VerificationType(Byte);
84 case 'C': return VerificationType(Char);
85 case 'S': return VerificationType(Short);
86 case 'I': return VerificationType(Integer);
87 case 'J': return VerificationType(Long);
88 case 'F': return VerificationType(Float);
89 case 'D': return VerificationType(Double);
90 case '[':
91 component = SymbolTable::lookup(
92 name(), 1, name()->utf8_length(),
93 CHECK_(VerificationType::bogus_type()));
94 return VerificationType::reference_type(component);
95 case 'L':
96 component = SymbolTable::lookup(
97 name(), 2, name()->utf8_length() - 1,
98 CHECK_(VerificationType::bogus_type()));
99 return VerificationType::reference_type(component);
100 default:
101 ShouldNotReachHere();
102 return VerificationType::bogus_type();
103 }
104 }
105
106 #ifndef PRODUCT
107
108 void VerificationType::print_on(outputStream* st) const {
109 switch (_u._data) {
110 case Bogus: st->print(" bogus "); break;
111 case Category1: st->print(" category1 "); break;
112 case Category2: st->print(" category2 "); break;
113 case Category2_2nd: st->print(" category2_2nd "); break;
114 case Boolean: st->print(" boolean "); break;
115 case Byte: st->print(" byte "); break;
116 case Short: st->print(" short "); break;
117 case Char: st->print(" char "); break;
118 case Integer: st->print(" integer "); break;
119 case Float: st->print(" float "); break;
120 case Long: st->print(" long "); break;
121 case Double: st->print(" double "); break;
122 case Long_2nd: st->print(" long_2nd "); break;
123 case Double_2nd: st->print(" double_2nd "); break;
124 case Null: st->print(" null "); break;
125 default:
126 if (is_uninitialized_this()) {
127 st->print(" uninitializedThis ");
128 } else if (is_uninitialized()) {
129 st->print(" uninitialized %d ", bci());
130 } else {
131 st->print(" class %s ", name()->as_klass_external_name());
132 }
133 }
134 }
135
136 #endif