/* * Copyright (c) 2003, 2010, 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/verificationType.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::is_reference_assignable_from( const VerificationType& from, instanceKlassHandle context, TRAPS) const { 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; } klassOop obj = SystemDictionary::resolve_or_fail( name_handle(), Handle(THREAD, context->class_loader()), Handle(THREAD, context->protection_domain()), true, CHECK_false); KlassHandle this_class(THREAD, obj); if (this_class->is_interface()) { // We treat interfaces as java.lang.Object, including // java.lang.Cloneable and java.io.Serializable return true; } else if (from.is_object()) { klassOop from_class = SystemDictionary::resolve_or_fail( from.name_handle(), Handle(THREAD, context->class_loader()), Handle(THREAD, context->protection_domain()), true, CHECK_false); return instanceKlass::cast(from_class)->is_subclass_of(this_class()); } } else if (is_array() && from.is_array()) { VerificationType comp_this = get_component(CHECK_false); VerificationType comp_from = from.get_component(CHECK_false); if (!comp_this.is_bogus() && !comp_from.is_bogus()) { return comp_this.is_assignable_from(comp_from, context, CHECK_false); } } return false; } VerificationType VerificationType::get_component(TRAPS) const { assert(is_array() && name()->utf8_length() >= 2, "Must be a valid array"); symbolOop 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 = SymbolTable::lookup( name(), 1, name()->utf8_length(), CHECK_(VerificationType::bogus_type())); return VerificationType::reference_type(component); case 'L': component = SymbolTable::lookup( 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(); } } #ifndef PRODUCT void VerificationType::print_on(outputStream* st) const { switch (_u._data) { case Bogus: st->print(" bogus "); 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; default: if (is_uninitialized_this()) { st->print(" uninitializedThis "); } else if (is_uninitialized()) { st->print(" uninitialized %d ", bci()); } else { st->print(" class %s ", name()->as_klass_external_name()); } } } #endif