1 /* 2 * Copyright (c) 2003, 2018, 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/systemDictionaryShared.hpp" 28 #include "classfile/verificationType.hpp" 29 #include "classfile/verifier.hpp" 30 #include "logging/log.hpp" 31 #include "runtime/handles.inline.hpp" 32 33 VerificationType VerificationType::from_tag(u1 tag) { 34 switch (tag) { 35 case ITEM_Top: return bogus_type(); 36 case ITEM_Integer: return integer_type(); 37 case ITEM_Float: return float_type(); 38 case ITEM_Double: return double_type(); 39 case ITEM_Long: return long_type(); 40 case ITEM_Null: return null_type(); 41 default: 42 ShouldNotReachHere(); 43 return bogus_type(); 44 } 45 } 46 47 bool VerificationType::resolve_and_check_assignability(InstanceKlass* klass, Symbol* name, 48 Symbol* from_name, bool from_field_is_protected, bool from_is_array, bool from_is_object, TRAPS) { 49 HandleMark hm(THREAD); 50 Klass* this_class = SystemDictionary::resolve_or_fail( 51 name, Handle(THREAD, klass->class_loader()), 52 Handle(THREAD, klass->protection_domain()), true, CHECK_false); 53 if (log_is_enabled(Debug, class, resolve)) { 54 Verifier::trace_class_resolution(this_class, klass); 55 } 56 57 if (this_class->is_interface() && (!from_field_is_protected || 58 from_name != vmSymbols::java_lang_Object())) { 59 // If we are not trying to access a protected field or method in 60 // java.lang.Object then, for arrays, we only allow assignability 61 // to interfaces java.lang.Cloneable and java.io.Serializable. 62 // Otherwise, we treat interfaces as java.lang.Object. 63 return !from_is_array || 64 this_class == SystemDictionary::Cloneable_klass() || 65 this_class == SystemDictionary::Serializable_klass(); 66 } else if (from_is_object) { 67 Klass* from_class = SystemDictionary::resolve_or_fail( 68 from_name, Handle(THREAD, klass->class_loader()), 69 Handle(THREAD, klass->protection_domain()), true, CHECK_false); 70 if (log_is_enabled(Debug, class, resolve)) { 71 Verifier::trace_class_resolution(from_class, klass); 72 } 73 return InstanceKlass::cast(from_class)->is_subclass_of(this_class); 74 } 75 76 return false; 77 } 78 79 bool VerificationType::is_reference_assignable_from( 80 const VerificationType& from, ClassVerifier* context, 81 bool from_field_is_protected, TRAPS) const { 82 InstanceKlass* klass = context->current_class(); 83 if (from.is_null()) { 84 // null is assignable to any reference 85 return true; 86 } else if (is_null()) { 87 return false; 88 } else if (name() == from.name()) { 89 return true; 90 } else if (is_object()) { 91 // We need check the class hierarchy to check assignability 92 if (name() == vmSymbols::java_lang_Object()) { 93 // any object or array is assignable to java.lang.Object 94 return true; 95 } 96 97 if (DumpSharedSpaces && SystemDictionaryShared::add_verification_constraint(klass, 98 name(), from.name(), from_field_is_protected, from.is_array(), 99 from.is_object())) { 100 // If add_verification_constraint() returns true, the resolution/check should be 101 // delayed until runtime. 102 return true; 103 } 104 105 return resolve_and_check_assignability(klass, name(), from.name(), 106 from_field_is_protected, from.is_array(), from.is_object(), THREAD); 107 } else if (is_array() && from.is_array()) { 108 VerificationType comp_this = get_component(context, CHECK_false); 109 VerificationType comp_from = from.get_component(context, CHECK_false); 110 if (!comp_this.is_bogus() && !comp_from.is_bogus()) { 111 return comp_this.is_component_assignable_from(comp_from, context, 112 from_field_is_protected, THREAD); 113 } 114 } 115 return false; 116 } 117 118 VerificationType VerificationType::get_component(ClassVerifier *context, TRAPS) const { 119 assert(is_array() && name()->utf8_length() >= 2, "Must be a valid array"); 120 Symbol* component; 121 switch (name()->char_at(1)) { 122 case 'Z': return VerificationType(Boolean); 123 case 'B': return VerificationType(Byte); 124 case 'C': return VerificationType(Char); 125 case 'S': return VerificationType(Short); 126 case 'I': return VerificationType(Integer); 127 case 'J': return VerificationType(Long); 128 case 'F': return VerificationType(Float); 129 case 'D': return VerificationType(Double); 130 case '[': 131 component = context->create_temporary_symbol( 132 name(), 1, name()->utf8_length(), 133 CHECK_(VerificationType::bogus_type())); 134 return VerificationType::reference_type(component); 135 case 'L': 136 component = context->create_temporary_symbol( 137 name(), 2, name()->utf8_length() - 1, 138 CHECK_(VerificationType::bogus_type())); 139 return VerificationType::reference_type(component); 140 default: 141 // Met an invalid type signature, e.g. [X 142 return VerificationType::bogus_type(); 143 } 144 } 145 146 void VerificationType::print_on(outputStream* st) const { 147 switch (_u._data) { 148 case Bogus: st->print("top"); break; 149 case Category1: st->print("category1"); break; 150 case Category2: st->print("category2"); break; 151 case Category2_2nd: st->print("category2_2nd"); break; 152 case Boolean: st->print("boolean"); break; 153 case Byte: st->print("byte"); break; 154 case Short: st->print("short"); break; 155 case Char: st->print("char"); break; 156 case Integer: st->print("integer"); break; 157 case Float: st->print("float"); break; 158 case Long: st->print("long"); break; 159 case Double: st->print("double"); break; 160 case Long_2nd: st->print("long_2nd"); break; 161 case Double_2nd: st->print("double_2nd"); break; 162 case Null: st->print("null"); break; 163 case ReferenceQuery: st->print("reference type"); break; 164 case Category1Query: st->print("category1 type"); break; 165 case Category2Query: st->print("category2 type"); break; 166 case Category2_2ndQuery: st->print("category2_2nd type"); break; 167 default: 168 if (is_uninitialized_this()) { 169 st->print("uninitializedThis"); 170 } else if (is_uninitialized()) { 171 st->print("uninitialized %d", bci()); 172 } else { 173 if (name() != NULL) { 174 name()->print_value_on(st); 175 } else { 176 st->print_cr("NULL"); 177 } 178 } 179 } 180 }