verificationType.cpp revision 1472:c18cbe5936b8 
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
28VerificationType 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
42bool 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
78VerificationType 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
108void 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
137