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/*
* 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"
#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, 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;
}
klassOop 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()) {
// 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(THREAD, klass->class_loader()),
Handle(THREAD, klass->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(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, 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();
}
}
#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
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