| /* |
| * Copyright (c) 2003, 2018, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #include "precompiled.hpp" |
| #include "classfile/symbolTable.hpp" |
| #include "classfile/systemDictionaryShared.hpp" |
| #include "classfile/verificationType.hpp" |
| #include "classfile/verifier.hpp" |
| #include "logging/log.hpp" |
| #include "runtime/handles.inline.hpp" |
| |
| VerificationType VerificationType::from_tag(u1 tag) { |
| switch (tag) { |
| case ITEM_Top: return bogus_type(); |
| case ITEM_Integer: return integer_type(); |
| case ITEM_Float: return float_type(); |
| case ITEM_Double: return double_type(); |
| case ITEM_Long: return long_type(); |
| case ITEM_Null: return null_type(); |
| default: |
| ShouldNotReachHere(); |
| return bogus_type(); |
| } |
| } |
| |
| bool VerificationType::resolve_and_check_assignability(InstanceKlass* klass, Symbol* name, |
| Symbol* from_name, bool from_field_is_protected, bool from_is_array, bool from_is_object, TRAPS) { |
| HandleMark hm(THREAD); |
| Klass* this_class = SystemDictionary::resolve_or_fail( |
| name, Handle(THREAD, klass->class_loader()), |
| Handle(THREAD, klass->protection_domain()), true, CHECK_false); |
| if (log_is_enabled(Debug, class, resolve)) { |
| Verifier::trace_class_resolution(this_class, klass); |
| } |
| |
| if (this_class->is_interface() && (!from_field_is_protected || |
| from_name != vmSymbols::java_lang_Object())) { |
| // If we are not trying to access a protected field or method in |
| // java.lang.Object then, for arrays, we only allow assignability |
| // to interfaces java.lang.Cloneable and java.io.Serializable. |
| // Otherwise, we treat interfaces as java.lang.Object. |
| return !from_is_array || |
| this_class == SystemDictionary::Cloneable_klass() || |
| this_class == SystemDictionary::Serializable_klass(); |
| } else if (from_is_object) { |
| Klass* from_class = SystemDictionary::resolve_or_fail( |
| from_name, Handle(THREAD, klass->class_loader()), |
| Handle(THREAD, klass->protection_domain()), true, CHECK_false); |
| if (log_is_enabled(Debug, class, resolve)) { |
| Verifier::trace_class_resolution(from_class, klass); |
| } |
| return InstanceKlass::cast(from_class)->is_subclass_of(this_class); |
| } |
| |
| return false; |
| } |
| |
| bool VerificationType::is_reference_assignable_from( |
| const VerificationType& from, ClassVerifier* context, |
| bool from_field_is_protected, TRAPS) const { |
| InstanceKlass* klass = context->current_class(); |
| if (from.is_null()) { |
| // null is assignable to any reference |
| return true; |
| } else if (is_null()) { |
| return false; |
| } else if (name() == from.name()) { |
| return true; |
| } else if (is_object()) { |
| // We need check the class hierarchy to check assignability |
| if (name() == vmSymbols::java_lang_Object()) { |
| // any object or array is assignable to java.lang.Object |
| return true; |
| } |
| |
| if (DumpSharedSpaces && SystemDictionaryShared::add_verification_constraint(klass, |
| name(), from.name(), from_field_is_protected, from.is_array(), |
| from.is_object())) { |
| // If add_verification_constraint() returns true, the resolution/check should be |
| // delayed until runtime. |
| return true; |
| } |
| |
| return resolve_and_check_assignability(klass, name(), from.name(), |
| from_field_is_protected, from.is_array(), from.is_object(), THREAD); |
| } else if (is_array() && from.is_array()) { |
| VerificationType comp_this = get_component(context, CHECK_false); |
| VerificationType comp_from = from.get_component(context, CHECK_false); |
| if (!comp_this.is_bogus() && !comp_from.is_bogus()) { |
| return comp_this.is_component_assignable_from(comp_from, context, |
| from_field_is_protected, CHECK_false); |
| } |
| } |
| return false; |
| } |
| |
| VerificationType VerificationType::get_component(ClassVerifier *context, TRAPS) const { |
| assert(is_array() && name()->utf8_length() >= 2, "Must be a valid array"); |
| Symbol* component; |
| switch (name()->byte_at(1)) { |
| case 'Z': return VerificationType(Boolean); |
| case 'B': return VerificationType(Byte); |
| case 'C': return VerificationType(Char); |
| case 'S': return VerificationType(Short); |
| case 'I': return VerificationType(Integer); |
| case 'J': return VerificationType(Long); |
| case 'F': return VerificationType(Float); |
| case 'D': return VerificationType(Double); |
| case '[': |
| component = context->create_temporary_symbol( |
| name(), 1, name()->utf8_length(), |
| CHECK_(VerificationType::bogus_type())); |
| return VerificationType::reference_type(component); |
| case 'L': |
| component = context->create_temporary_symbol( |
| name(), 2, name()->utf8_length() - 1, |
| CHECK_(VerificationType::bogus_type())); |
| return VerificationType::reference_type(component); |
| default: |
| // Met an invalid type signature, e.g. [X |
| return VerificationType::bogus_type(); |
| } |
| } |
| |
| void VerificationType::print_on(outputStream* st) const { |
| switch (_u._data) { |
| case Bogus: st->print("top"); break; |
| case Category1: st->print("category1"); break; |
| case Category2: st->print("category2"); break; |
| case Category2_2nd: st->print("category2_2nd"); break; |
| case Boolean: st->print("boolean"); break; |
| case Byte: st->print("byte"); break; |
| case Short: st->print("short"); break; |
| case Char: st->print("char"); break; |
| case Integer: st->print("integer"); break; |
| case Float: st->print("float"); break; |
| case Long: st->print("long"); break; |
| case Double: st->print("double"); break; |
| case Long_2nd: st->print("long_2nd"); break; |
| case Double_2nd: st->print("double_2nd"); break; |
| case Null: st->print("null"); break; |
| case ReferenceQuery: st->print("reference type"); break; |
| case Category1Query: st->print("category1 type"); break; |
| case Category2Query: st->print("category2 type"); break; |
| case Category2_2ndQuery: st->print("category2_2nd type"); break; |
| default: |
| if (is_uninitialized_this()) { |
| st->print("uninitializedThis"); |
| } else if (is_uninitialized()) { |
| st->print("uninitialized %d", bci()); |
| } else { |
| name()->print_value_on(st); |
| } |
| } |
| } |
