Mercurial > hg > truffle
diff src/share/vm/classfile/verificationType.cpp @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | c18cbe5936b8 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/share/vm/classfile/verificationType.cpp Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,136 @@ +/* + * Copyright 2003-2006 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, + * CA 95054 USA or visit www.sun.com if you need additional information or + * have any questions. + * + */ + +# include "incls/_precompiled.incl" +# include "incls/_verificationType.cpp.incl" + +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 this_class = SystemDictionary::resolve_or_fail( + name_handle(), Handle(THREAD, context->class_loader()), + Handle(THREAD, context->protection_domain()), true, CHECK_false); + if (this_class->klass_part()->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); + 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: + ShouldNotReachHere(); + 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