1 /* 2 * Copyright (c) 2003, 2015, 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, 46 bool from_field_is_protected, TRAPS) const { 47 instanceKlassHandle klass = context->current_class(); 48 if (from.is_null()) { 49 // null is assignable to any reference 50 return true; 51 } else if (is_null()) { 52 return false; 53 } else if (name() == from.name()) { 54 return true; 55 } else if (is_object()) { 56 // We need check the class hierarchy to check assignability 57 if (name() == vmSymbols::java_lang_Object()) { 58 // any object or array is assignable to java.lang.Object 59 return true; 60 } 61 Klass* obj = SystemDictionary::resolve_or_fail( 62 name(), Handle(THREAD, klass->class_loader()), 63 Handle(THREAD, klass->protection_domain()), true, CHECK_false); 64 if (TraceClassResolution) { 65 Verifier::trace_class_resolution(obj, klass()); 66 } 67 68 KlassHandle this_class(THREAD, obj); 69 70 if (this_class->is_interface() && (!from_field_is_protected || 71 from.name() != vmSymbols::java_lang_Object())) { 72 // If we are not trying to access a protected field or method in 73 // java.lang.Object then we treat interfaces as java.lang.Object, 74 // including java.lang.Cloneable and java.io.Serializable. 75 return true; 76 } else if (from.is_object()) { 77 Klass* from_class = SystemDictionary::resolve_or_fail( 78 from.name(), Handle(THREAD, klass->class_loader()), 79 Handle(THREAD, klass->protection_domain()), true, CHECK_false); 80 if (TraceClassResolution) { 81 Verifier::trace_class_resolution(from_class, klass()); 82 } 83 return InstanceKlass::cast(from_class)->is_subclass_of(this_class()); 84 } 85 } else if (is_array() && from.is_array()) { 86 VerificationType comp_this = get_component(context, CHECK_false); 87 VerificationType comp_from = from.get_component(context, CHECK_false); 88 if (!comp_this.is_bogus() && !comp_from.is_bogus()) { 89 return comp_this.is_assignable_from(comp_from, context, 90 from_field_is_protected, CHECK_false); 91 } 92 } 93 return false; 94 } 95 96 VerificationType VerificationType::get_component(ClassVerifier *context, TRAPS) const { 97 assert(is_array() && name()->utf8_length() >= 2, "Must be a valid array"); 98 Symbol* component; 99 switch (name()->byte_at(1)) { 100 case 'Z': return VerificationType(Boolean); 101 case 'B': return VerificationType(Byte); 102 case 'C': return VerificationType(Char); 103 case 'S': return VerificationType(Short); 104 case 'I': return VerificationType(Integer); 105 case 'J': return VerificationType(Long); 106 case 'F': return VerificationType(Float); 107 case 'D': return VerificationType(Double); 108 case '[': 109 component = context->create_temporary_symbol( 110 name(), 1, name()->utf8_length(), 111 CHECK_(VerificationType::bogus_type())); 112 return VerificationType::reference_type(component); 113 case 'L': 114 component = context->create_temporary_symbol( 115 name(), 2, name()->utf8_length() - 1, 116 CHECK_(VerificationType::bogus_type())); 117 return VerificationType::reference_type(component); 118 default: 119 // Met an invalid type signature, e.g. [X 120 return VerificationType::bogus_type(); 121 } 122 } 123 124 void VerificationType::print_on(outputStream* st) const { 125 switch (_u._data) { 126 case Bogus: st->print("top"); break; 127 case Category1: st->print("category1"); break; 128 case Category2: st->print("category2"); break; 129 case Category2_2nd: st->print("category2_2nd"); break; 130 case Boolean: st->print("boolean"); break; 131 case Byte: st->print("byte"); break; 132 case Short: st->print("short"); break; 133 case Char: st->print("char"); break; 134 case Integer: st->print("integer"); break; 135 case Float: st->print("float"); break; 136 case Long: st->print("long"); break; 137 case Double: st->print("double"); break; 138 case Long_2nd: st->print("long_2nd"); break; 139 case Double_2nd: st->print("double_2nd"); break; 140 case Null: st->print("null"); break; 141 case ReferenceQuery: st->print("reference type"); break; 142 case Category1Query: st->print("category1 type"); break; 143 case Category2Query: st->print("category2 type"); break; 144 case Category2_2ndQuery: st->print("category2_2nd type"); break; 145 default: 146 if (is_uninitialized_this()) { 147 st->print("uninitializedThis"); 148 } else if (is_uninitialized()) { 149 st->print("uninitialized %d", bci()); 150 } else { 151 name()->print_value_on(st); 152 } 153 } 154 }