Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

  * Copyright (c) 2003, 2016, 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"

 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, ClassVerifier* context,

     bool from_field_is_protected, TRAPS) const {

   instanceKlassHandle 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;

     }

     Klass* obj = SystemDictionary::resolve_or_fail(

         name(), Handle(THREAD, klass->class_loader()),

         Handle(THREAD, klass->protection_domain()), true, CHECK_false);

     KlassHandle this_class(THREAD, obj);

     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 we treat interfaces as java.lang.Object,

       // including java.lang.Cloneable and java.io.Serializable.

       return true;

     } 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);

       bool result = InstanceKlass::cast(from_class)->is_subclass_of(this_class());

       if (result && DumpSharedSpaces) {

         if (klass()->is_subclass_of(from_class) && klass()->is_subclass_of(this_class())) {

           // No need to save verification dependency. At run time, <klass> will be

           // loaded from the archived only if <from_class> and <this_class> are

           // also loaded from the archive. I.e., all 3 classes are exactly the same

           // as we saw at archive creation time.

         } else {

           // Save the dependency. At run time, we need to check that the condition

           // from_class->is_subclass_of(this_class() is still true.

           Symbol* accessor_clsname = from.name();

           Symbol* target_clsname = this_class()->name();

           SystemDictionaryShared::add_verification_dependency(klass(),

                        accessor_clsname, target_clsname);

         }

       }

       return result;

     }

   } 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_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);

       }

   }

 }