author | coleenp |
Wed, 15 Mar 2017 10:25:37 -0400 | |
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parent 46271 | 979ebd346ecf |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2003, 2017, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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#include "precompiled.hpp" |
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#include "classfile/symbolTable.hpp" |
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#include "classfile/systemDictionaryShared.hpp" |
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#include "classfile/verificationType.hpp" |
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#include "classfile/verifier.hpp" |
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VerificationType VerificationType::from_tag(u1 tag) { |
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switch (tag) { |
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case ITEM_Top: return bogus_type(); |
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case ITEM_Integer: return integer_type(); |
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case ITEM_Float: return float_type(); |
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case ITEM_Double: return double_type(); |
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case ITEM_Long: return long_type(); |
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case ITEM_Null: return null_type(); |
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default: |
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ShouldNotReachHere(); |
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return bogus_type(); |
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} |
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} |
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bool VerificationType::resolve_and_check_assignability(InstanceKlass* klass, Symbol* name, |
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Symbol* from_name, bool from_field_is_protected, bool from_is_array, bool from_is_object, TRAPS) { |
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HandleMark hm(THREAD); |
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Klass* this_class = SystemDictionary::resolve_or_fail( |
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name, Handle(THREAD, klass->class_loader()), |
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Handle(THREAD, klass->protection_domain()), true, CHECK_false); |
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if (log_is_enabled(Debug, class, resolve)) { |
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Verifier::trace_class_resolution(this_class, klass); |
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} |
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if (this_class->is_interface() && (!from_field_is_protected || |
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from_name != vmSymbols::java_lang_Object())) { |
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// If we are not trying to access a protected field or method in |
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// java.lang.Object then, for arrays, we only allow assignability |
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// to interfaces java.lang.Cloneable and java.io.Serializable. |
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// Otherwise, we treat interfaces as java.lang.Object. |
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return !from_is_array || |
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this_class == SystemDictionary::Cloneable_klass() || |
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this_class == SystemDictionary::Serializable_klass(); |
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} else if (from_is_object) { |
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Klass* from_class = SystemDictionary::resolve_or_fail( |
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from_name, Handle(THREAD, klass->class_loader()), |
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Handle(THREAD, klass->protection_domain()), true, CHECK_false); |
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if (log_is_enabled(Debug, class, resolve)) { |
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Verifier::trace_class_resolution(from_class, klass); |
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} |
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return InstanceKlass::cast(from_class)->is_subclass_of(this_class); |
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} |
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return false; |
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} |
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bool VerificationType::is_reference_assignable_from( |
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const VerificationType& from, ClassVerifier* context, |
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bool from_field_is_protected, TRAPS) const { |
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InstanceKlass* klass = context->current_class(); |
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if (from.is_null()) { |
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// null is assignable to any reference |
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return true; |
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} else if (is_null()) { |
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return false; |
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} else if (name() == from.name()) { |
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return true; |
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} else if (is_object()) { |
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// We need check the class hierarchy to check assignability |
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if (name() == vmSymbols::java_lang_Object()) { |
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// any object or array is assignable to java.lang.Object |
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return true; |
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} |
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if (DumpSharedSpaces && SystemDictionaryShared::add_verification_constraint(klass, |
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name(), from.name(), from_field_is_protected, from.is_array(), |
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from.is_object())) { |
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// If add_verification_constraint() returns true, the resolution/check should be |
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// delayed until runtime. |
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return true; |
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} |
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return resolve_and_check_assignability(klass, name(), from.name(), |
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from_field_is_protected, from.is_array(), from.is_object(), THREAD); |
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} else if (is_array() && from.is_array()) { |
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VerificationType comp_this = get_component(context, CHECK_false); |
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VerificationType comp_from = from.get_component(context, CHECK_false); |
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if (!comp_this.is_bogus() && !comp_from.is_bogus()) { |
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return comp_this.is_component_assignable_from(comp_from, context, |
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from_field_is_protected, CHECK_false); |
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} |
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} |
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return false; |
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} |
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VerificationType VerificationType::get_component(ClassVerifier *context, TRAPS) const { |
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assert(is_array() && name()->utf8_length() >= 2, "Must be a valid array"); |
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Symbol* component; |
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switch (name()->byte_at(1)) { |
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case 'Z': return VerificationType(Boolean); |
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case 'B': return VerificationType(Byte); |
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case 'C': return VerificationType(Char); |
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case 'S': return VerificationType(Short); |
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case 'I': return VerificationType(Integer); |
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case 'J': return VerificationType(Long); |
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case 'F': return VerificationType(Float); |
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case 'D': return VerificationType(Double); |
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case '[': |
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component = context->create_temporary_symbol( |
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name(), 1, name()->utf8_length(), |
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CHECK_(VerificationType::bogus_type())); |
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return VerificationType::reference_type(component); |
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case 'L': |
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component = context->create_temporary_symbol( |
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name(), 2, name()->utf8_length() - 1, |
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CHECK_(VerificationType::bogus_type())); |
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return VerificationType::reference_type(component); |
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default: |
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// Met an invalid type signature, e.g. [X |
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return VerificationType::bogus_type(); |
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} |
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} |
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void VerificationType::print_on(outputStream* st) const { |
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switch (_u._data) { |
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case Bogus: st->print("top"); break; |
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case Category1: st->print("category1"); break; |
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case Category2: st->print("category2"); break; |
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case Category2_2nd: st->print("category2_2nd"); break; |
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case Boolean: st->print("boolean"); break; |
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case Byte: st->print("byte"); break; |
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case Short: st->print("short"); break; |
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case Char: st->print("char"); break; |
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case Integer: st->print("integer"); break; |
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case Float: st->print("float"); break; |
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case Long: st->print("long"); break; |
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case Double: st->print("double"); break; |
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case Long_2nd: st->print("long_2nd"); break; |
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case Double_2nd: st->print("double_2nd"); break; |
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case Null: st->print("null"); break; |
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case ReferenceQuery: st->print("reference type"); break; |
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case Category1Query: st->print("category1 type"); break; |
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case Category2Query: st->print("category2 type"); break; |
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case Category2_2ndQuery: st->print("category2_2nd type"); break; |
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default: |
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if (is_uninitialized_this()) { |
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st->print("uninitializedThis"); |
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} else if (is_uninitialized()) { |
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st->print("uninitialized %d", bci()); |
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} else { |
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name()->print_value_on(st); |
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} |
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} |
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} |