duke@435: /*
kamg@3992:  * Copyright (c) 2003, 2012, Oracle and/or its affiliates. All rights reserved.
duke@435:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435:  *
duke@435:  * This code is free software; you can redistribute it and/or modify it
duke@435:  * under the terms of the GNU General Public License version 2 only, as
duke@435:  * published by the Free Software Foundation.
duke@435:  *
duke@435:  * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
duke@435:  * version 2 for more details (a copy is included in the LICENSE file that
duke@435:  * accompanied this code).
duke@435:  *
duke@435:  * You should have received a copy of the GNU General Public License version
duke@435:  * 2 along with this work; if not, write to the Free Software Foundation,
duke@435:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435:  *
trims@1907:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907:  * or visit www.oracle.com if you need additional information or have any
trims@1907:  * questions.
duke@435:  *
duke@435:  */
duke@435: 
stefank@2314: #include "precompiled.hpp"
stefank@2314: #include "classfile/symbolTable.hpp"
stefank@2314: #include "classfile/verificationType.hpp"
coleenp@2497: #include "classfile/verifier.hpp"
duke@435: 
duke@435: VerificationType VerificationType::from_tag(u1 tag) {
duke@435:   switch (tag) {
duke@435:     case ITEM_Top:     return bogus_type();
duke@435:     case ITEM_Integer: return integer_type();
duke@435:     case ITEM_Float:   return float_type();
duke@435:     case ITEM_Double:  return double_type();
duke@435:     case ITEM_Long:    return long_type();
duke@435:     case ITEM_Null:    return null_type();
duke@435:     default:
duke@435:       ShouldNotReachHere();
duke@435:       return bogus_type();
duke@435:   }
duke@435: }
duke@435: 
duke@435: bool VerificationType::is_reference_assignable_from(
coleenp@2497:     const VerificationType& from, ClassVerifier* context, TRAPS) const {
coleenp@2497:   instanceKlassHandle klass = context->current_class();
duke@435:   if (from.is_null()) {
duke@435:     // null is assignable to any reference
duke@435:     return true;
duke@435:   } else if (is_null()) {
duke@435:     return false;
duke@435:   } else if (name() == from.name()) {
duke@435:     return true;
duke@435:   } else if (is_object()) {
duke@435:     // We need check the class hierarchy to check assignability
duke@435:     if (name() == vmSymbols::java_lang_Object()) {
duke@435:       // any object or array is assignable to java.lang.Object
duke@435:       return true;
duke@435:     }
coleenp@4037:     Klass* obj = SystemDictionary::resolve_or_fail(
coleenp@2497:         name(), Handle(THREAD, klass->class_loader()),
coleenp@2497:         Handle(THREAD, klass->protection_domain()), true, CHECK_false);
kamg@2158:     KlassHandle this_class(THREAD, obj);
kamg@2158: 
kamg@2158:     if (this_class->is_interface()) {
duke@435:       // We treat interfaces as java.lang.Object, including
duke@435:       // java.lang.Cloneable and java.io.Serializable
duke@435:       return true;
duke@435:     } else if (from.is_object()) {
coleenp@4037:       Klass* from_class = SystemDictionary::resolve_or_fail(
coleenp@2497:           from.name(), Handle(THREAD, klass->class_loader()),
coleenp@2497:           Handle(THREAD, klass->protection_domain()), true, CHECK_false);
coleenp@4037:       return InstanceKlass::cast(from_class)->is_subclass_of(this_class());
duke@435:     }
duke@435:   } else if (is_array() && from.is_array()) {
coleenp@2497:     VerificationType comp_this = get_component(context, CHECK_false);
coleenp@2497:     VerificationType comp_from = from.get_component(context, CHECK_false);
apangin@2032:     if (!comp_this.is_bogus() && !comp_from.is_bogus()) {
apangin@2032:       return comp_this.is_assignable_from(comp_from, context, CHECK_false);
apangin@2032:     }
duke@435:   }
duke@435:   return false;
duke@435: }
duke@435: 
coleenp@2497: VerificationType VerificationType::get_component(ClassVerifier *context, TRAPS) const {
duke@435:   assert(is_array() && name()->utf8_length() >= 2, "Must be a valid array");
coleenp@2497:   Symbol* component;
duke@435:   switch (name()->byte_at(1)) {
duke@435:     case 'Z': return VerificationType(Boolean);
duke@435:     case 'B': return VerificationType(Byte);
duke@435:     case 'C': return VerificationType(Char);
duke@435:     case 'S': return VerificationType(Short);
duke@435:     case 'I': return VerificationType(Integer);
duke@435:     case 'J': return VerificationType(Long);
duke@435:     case 'F': return VerificationType(Float);
duke@435:     case 'D': return VerificationType(Double);
duke@435:     case '[':
coleenp@2497:       component = context->create_temporary_symbol(
duke@435:         name(), 1, name()->utf8_length(),
duke@435:         CHECK_(VerificationType::bogus_type()));
duke@435:       return VerificationType::reference_type(component);
duke@435:     case 'L':
coleenp@2497:       component = context->create_temporary_symbol(
duke@435:         name(), 2, name()->utf8_length() - 1,
duke@435:         CHECK_(VerificationType::bogus_type()));
duke@435:       return VerificationType::reference_type(component);
duke@435:     default:
apangin@2032:       // Met an invalid type signature, e.g. [X
duke@435:       return VerificationType::bogus_type();
duke@435:   }
duke@435: }
duke@435: 
duke@435: void VerificationType::print_on(outputStream* st) const {
duke@435:   switch (_u._data) {
kamg@3992:     case Bogus:            st->print("top"); break;
kamg@3992:     case Category1:        st->print("category1"); break;
kamg@3992:     case Category2:        st->print("category2"); break;
kamg@3992:     case Category2_2nd:    st->print("category2_2nd"); break;
kamg@3992:     case Boolean:          st->print("boolean"); break;
kamg@3992:     case Byte:             st->print("byte"); break;
kamg@3992:     case Short:            st->print("short"); break;
kamg@3992:     case Char:             st->print("char"); break;
kamg@3992:     case Integer:          st->print("integer"); break;
kamg@3992:     case Float:            st->print("float"); break;
kamg@3992:     case Long:             st->print("long"); break;
kamg@3992:     case Double:           st->print("double"); break;
kamg@3992:     case Long_2nd:         st->print("long_2nd"); break;
kamg@3992:     case Double_2nd:       st->print("double_2nd"); break;
kamg@3992:     case Null:             st->print("null"); break;
kamg@3992:     case ReferenceQuery:   st->print("reference type"); break;
kamg@3992:     case Category1Query:   st->print("category1 type"); break;
kamg@3992:     case Category2Query:   st->print("category2 type"); break;
kamg@3992:     case Category2_2ndQuery: st->print("category2_2nd type"); break;
duke@435:     default:
duke@435:       if (is_uninitialized_this()) {
kamg@3992:         st->print("uninitializedThis");
duke@435:       } else if (is_uninitialized()) {
kamg@3992:         st->print("uninitialized %d", bci());
duke@435:       } else {
kamg@3992:         name()->print_value_on(st);
duke@435:       }
duke@435:   }
duke@435: }