1/* 2 * Copyright (c) 2003, 2016, 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 31VerificationType VerificationType::from_tag(u1 tag) { 32 switch (tag) { 33 case ITEM_Top: return bogus_type(); 34 case ITEM_Integer: return integer_type(); 35 case ITEM_Float: return float_type(); 36 case ITEM_Double: return double_type(); 37 case ITEM_Long: return long_type(); 38 case ITEM_Null: return null_type(); 39 default: 40 ShouldNotReachHere(); 41 return bogus_type(); 42 } 43} 44 45bool VerificationType::resolve_and_check_assignability(instanceKlassHandle klass, Symbol* name, 46 Symbol* from_name, bool from_field_is_protected, bool from_is_array, bool from_is_object, TRAPS) { 47 Klass* obj = SystemDictionary::resolve_or_fail( 48 name, Handle(THREAD, klass->class_loader()), 49 Handle(THREAD, klass->protection_domain()), true, CHECK_false); 50 if (log_is_enabled(Debug, class, resolve)) { 51 Verifier::trace_class_resolution(obj, klass()); 52 } 53 54 KlassHandle this_class(THREAD, obj); 55 56 if (this_class->is_interface() && (!from_field_is_protected || 57 from_name != vmSymbols::java_lang_Object())) { 58 // If we are not trying to access a protected field or method in 59 // java.lang.Object then, for arrays, we only allow assignability 60 // to interfaces java.lang.Cloneable and java.io.Serializable. 61 // Otherwise, we treat interfaces as java.lang.Object. 62 return !from_is_array || 63 this_class == SystemDictionary::Cloneable_klass() || 64 this_class == SystemDictionary::Serializable_klass(); 65 } else if (from_is_object) { 66 Klass* from_class = SystemDictionary::resolve_or_fail( 67 from_name, Handle(THREAD, klass->class_loader()), 68 Handle(THREAD, klass->protection_domain()), true, CHECK_false); 69 if (log_is_enabled(Debug, class, resolve)) { 70 Verifier::trace_class_resolution(from_class, klass()); 71 } 72 return InstanceKlass::cast(from_class)->is_subclass_of(this_class()); 73 } 74 75 return false; 76} 77 78bool VerificationType::is_reference_assignable_from( 79 const VerificationType& from, ClassVerifier* context, 80 bool from_field_is_protected, TRAPS) const { 81 instanceKlassHandle klass = context->current_class(); 82 if (from.is_null()) { 83 // null is assignable to any reference 84 return true; 85 } else if (is_null()) { 86 return false; 87 } else if (name() == from.name()) { 88 return true; 89 } else if (is_object()) { 90 // We need check the class hierarchy to check assignability 91 if (name() == vmSymbols::java_lang_Object()) { 92 // any object or array is assignable to java.lang.Object 93 return true; 94 } 95 96 if (DumpSharedSpaces && SystemDictionaryShared::add_verification_constraint(klass(), 97 name(), from.name(), from_field_is_protected, from.is_array(), 98 from.is_object())) { 99 // If add_verification_constraint() returns true, the resolution/check should be 100 // delayed until runtime. 101 return true; 102 } 103 104 return resolve_and_check_assignability(klass(), name(), from.name(), 105 from_field_is_protected, from.is_array(), from.is_object(), THREAD); 106 } else if (is_array() && from.is_array()) { 107 VerificationType comp_this = get_component(context, CHECK_false); 108 VerificationType comp_from = from.get_component(context, CHECK_false); 109 if (!comp_this.is_bogus() && !comp_from.is_bogus()) { 110 return comp_this.is_component_assignable_from(comp_from, context, 111 from_field_is_protected, CHECK_false); 112 } 113 } 114 return false; 115} 116 117VerificationType VerificationType::get_component(ClassVerifier *context, TRAPS) const { 118 assert(is_array() && name()->utf8_length() >= 2, "Must be a valid array"); 119 Symbol* component; 120 switch (name()->byte_at(1)) { 121 case 'Z': return VerificationType(Boolean); 122 case 'B': return VerificationType(Byte); 123 case 'C': return VerificationType(Char); 124 case 'S': return VerificationType(Short); 125 case 'I': return VerificationType(Integer); 126 case 'J': return VerificationType(Long); 127 case 'F': return VerificationType(Float); 128 case 'D': return VerificationType(Double); 129 case '[': 130 component = context->create_temporary_symbol( 131 name(), 1, name()->utf8_length(), 132 CHECK_(VerificationType::bogus_type())); 133 return VerificationType::reference_type(component); 134 case 'L': 135 component = context->create_temporary_symbol( 136 name(), 2, name()->utf8_length() - 1, 137 CHECK_(VerificationType::bogus_type())); 138 return VerificationType::reference_type(component); 139 default: 140 // Met an invalid type signature, e.g. [X 141 return VerificationType::bogus_type(); 142 } 143} 144 145void VerificationType::print_on(outputStream* st) const { 146 switch (_u._data) { 147 case Bogus: st->print("top"); break; 148 case Category1: st->print("category1"); break; 149 case Category2: st->print("category2"); break; 150 case Category2_2nd: st->print("category2_2nd"); break; 151 case Boolean: st->print("boolean"); break; 152 case Byte: st->print("byte"); break; 153 case Short: st->print("short"); break; 154 case Char: st->print("char"); break; 155 case Integer: st->print("integer"); break; 156 case Float: st->print("float"); break; 157 case Long: st->print("long"); break; 158 case Double: st->print("double"); break; 159 case Long_2nd: st->print("long_2nd"); break; 160 case Double_2nd: st->print("double_2nd"); break; 161 case Null: st->print("null"); break; 162 case ReferenceQuery: st->print("reference type"); break; 163 case Category1Query: st->print("category1 type"); break; 164 case Category2Query: st->print("category2 type"); break; 165 case Category2_2ndQuery: st->print("category2_2nd type"); break; 166 default: 167 if (is_uninitialized_this()) { 168 st->print("uninitializedThis"); 169 } else if (is_uninitialized()) { 170 st->print("uninitialized %d", bci()); 171 } else { 172 name()->print_value_on(st); 173 } 174 } 175} 176