1 /* 2 * Copyright (c) 2003, 2023, 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 "cds/cdsConfig.hpp" 27 #include "classfile/symbolTable.hpp" 28 #include "classfile/systemDictionary.hpp" 29 #include "classfile/systemDictionaryShared.hpp" 30 #include "classfile/verificationType.hpp" 31 #include "classfile/verifier.hpp" 32 #include "classfile/vmClasses.hpp" 33 #include "classfile/vmSymbols.hpp" 34 #include "logging/log.hpp" 35 #include "oops/klass.inline.hpp" 36 #include "runtime/handles.inline.hpp" 37 38 VerificationType VerificationType::from_tag(u1 tag) { 39 switch (tag) { 40 case ITEM_Top: return bogus_type(); 41 case ITEM_Integer: return integer_type(); 42 case ITEM_Float: return float_type(); 43 case ITEM_Double: return double_type(); 44 case ITEM_Long: return long_type(); 45 case ITEM_Null: return null_type(); 46 default: 47 ShouldNotReachHere(); 48 return bogus_type(); 49 } 50 } 51 52 bool VerificationType::resolve_and_check_assignability(InstanceKlass* klass, Symbol* name, 53 Symbol* from_name, bool from_field_is_protected, bool from_is_array, bool from_is_object, TRAPS) { 54 HandleMark hm(THREAD); 55 Klass* this_class; 56 if (klass->is_hidden() && klass->name() == name) { 57 this_class = klass; 58 } else { 59 this_class = SystemDictionary::resolve_or_fail( 60 name, Handle(THREAD, klass->class_loader()), 61 Handle(THREAD, klass->protection_domain()), true, CHECK_false); 62 if (log_is_enabled(Debug, class, resolve)) { 63 Verifier::trace_class_resolution(this_class, klass); 64 } 65 } 66 67 if (this_class->is_interface() && (!from_field_is_protected || 68 from_name != vmSymbols::java_lang_Object())) { 69 // If we are not trying to access a protected field or method in 70 // java.lang.Object then, for arrays, we only allow assignability 71 // to interfaces java.lang.Cloneable and java.io.Serializable. 72 // Otherwise, we treat interfaces as java.lang.Object. 73 return !from_is_array || 74 this_class == vmClasses::Cloneable_klass() || 75 this_class == vmClasses::Serializable_klass(); 76 } else if (from_is_object) { 77 Klass* from_class; 78 if (klass->is_hidden() && klass->name() == from_name) { 79 from_class = klass; 80 } else { 81 from_class = SystemDictionary::resolve_or_fail( 82 from_name, Handle(THREAD, klass->class_loader()), 83 Handle(THREAD, klass->protection_domain()), true, CHECK_false); 84 if (log_is_enabled(Debug, class, resolve)) { 85 Verifier::trace_class_resolution(from_class, klass); 86 } 87 } 88 return from_class->is_subclass_of(this_class); 89 } 90 91 return false; 92 } 93 94 bool VerificationType::is_reference_assignable_from( 95 const VerificationType& from, ClassVerifier* context, 96 bool from_field_is_protected, TRAPS) const { 97 InstanceKlass* klass = context->current_class(); 98 if (from.is_null()) { 99 // null is assignable to any reference 100 return true; 101 } else if (is_null()) { 102 return false; 103 } else if (name() == from.name()) { 104 return true; 105 } else if (is_object()) { 106 // We need check the class hierarchy to check assignability 107 if (name() == vmSymbols::java_lang_Object()) { 108 // any object or array is assignable to java.lang.Object 109 return true; 110 } 111 112 if (CDSConfig::is_dumping_archive()) { 113 if (SystemDictionaryShared::add_verification_constraint(klass, 114 name(), from.name(), from_field_is_protected, from.is_array(), 115 from.is_object())) { 116 // If add_verification_constraint() returns true, the resolution/check should be 117 // delayed until runtime. 118 return true; 119 } 120 } 121 122 return resolve_and_check_assignability(klass, name(), from.name(), 123 from_field_is_protected, from.is_array(), from.is_object(), THREAD); 124 } else if (is_array() && from.is_array()) { 125 VerificationType comp_this = get_component(context); 126 VerificationType comp_from = from.get_component(context); 127 if (!comp_this.is_bogus() && !comp_from.is_bogus()) { 128 return comp_this.is_component_assignable_from(comp_from, context, 129 from_field_is_protected, THREAD); 130 } 131 } 132 return false; 133 } 134 135 VerificationType VerificationType::get_component(ClassVerifier *context) const { 136 assert(is_array() && name()->utf8_length() >= 2, "Must be a valid array"); 137 SignatureStream ss(name(), false); 138 ss.skip_array_prefix(1); 139 switch (ss.type()) { 140 case T_BOOLEAN: return VerificationType(Boolean); 141 case T_BYTE: return VerificationType(Byte); 142 case T_CHAR: return VerificationType(Char); 143 case T_SHORT: return VerificationType(Short); 144 case T_INT: return VerificationType(Integer); 145 case T_LONG: return VerificationType(Long); 146 case T_FLOAT: return VerificationType(Float); 147 case T_DOUBLE: return VerificationType(Double); 148 case T_ARRAY: 149 case T_OBJECT: { 150 guarantee(ss.is_reference(), "unchecked verifier input?"); 151 Symbol* component = ss.as_symbol(); 152 // Create another symbol to save as signature stream unreferences this symbol. 153 Symbol* component_copy = context->create_temporary_symbol(component); 154 assert(component_copy == component, "symbols don't match"); 155 return VerificationType::reference_type(component_copy); 156 } 157 default: 158 // Met an invalid type signature, e.g. [X 159 return VerificationType::bogus_type(); 160 } 161 } 162 163 void VerificationType::print_on(outputStream* st) const { 164 switch (_u._data) { 165 case Bogus: st->print("top"); break; 166 case Category1: st->print("category1"); break; 167 case Category2: st->print("category2"); break; 168 case Category2_2nd: st->print("category2_2nd"); break; 169 case Boolean: st->print("boolean"); break; 170 case Byte: st->print("byte"); break; 171 case Short: st->print("short"); break; 172 case Char: st->print("char"); break; 173 case Integer: st->print("integer"); break; 174 case Float: st->print("float"); break; 175 case Long: st->print("long"); break; 176 case Double: st->print("double"); break; 177 case Long_2nd: st->print("long_2nd"); break; 178 case Double_2nd: st->print("double_2nd"); break; 179 case Null: st->print("null"); break; 180 case ReferenceQuery: st->print("reference type"); break; 181 case Category1Query: st->print("category1 type"); break; 182 case Category2Query: st->print("category2 type"); break; 183 case Category2_2ndQuery: st->print("category2_2nd type"); break; 184 default: 185 if (is_uninitialized_this()) { 186 st->print("uninitializedThis"); 187 } else if (is_uninitialized()) { 188 st->print("uninitialized %d", bci()); 189 } else { 190 if (name() != nullptr) { 191 name()->print_value_on(st); 192 } else { 193 st->print_cr("null"); 194 } 195 } 196 } 197 } --- EOF ---