86 lines
3.1 KiB
Java
86 lines
3.1 KiB
Java
/*
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* Copyright (c) 2014, 2015, 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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* @test
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* @bug 8015499
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* @summary javac, Gen is generating extra checkcast instructions in some corner cases
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* @enablePreview
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* @modules java.base/jdk.internal.classfile.impl
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* jdk.compiler/com.sun.tools.javac.util
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* @run main DoubleCastTest
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*/
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import java.util.List;
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import java.util.ArrayList;
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import java.util.Objects;
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import java.lang.classfile.*;
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import java.lang.classfile.attribute.CodeAttribute;
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import java.lang.classfile.constantpool.ClassEntry;
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import java.lang.classfile.instruction.TypeCheckInstruction;
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import com.sun.tools.javac.util.Assert;
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public class DoubleCastTest {
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class C {
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Object x;
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Object m() { return null; }
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void m1(byte[] b) {}
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void m2() {
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Object o;
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Object[] os = null;
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m1((byte[])(o = null));
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m1((byte[])o);
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m1((byte[])(o == null ? o : o));
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m1((byte[])m());
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m1((byte[])os[0]);
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m1((byte[])this.x);
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m1((byte[])((byte []) (o = null)));
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}
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}
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public static void main(String... cmdline) throws Exception {
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ClassModel cls = ClassFile.of().parse(Objects.requireNonNull(DoubleCastTest.class.getResourceAsStream("DoubleCastTest$C.class")).readAllBytes());
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for (MethodModel m: cls.methods())
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check(m);
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}
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static void check(MethodModel m) throws Exception {
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boolean last_is_cast = false;
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ClassEntry last_ref = null;
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CodeAttribute ea = m.findAttribute(Attributes.code()).orElseThrow();
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for (int i = 0; i < ea.elementList().size(); ++i) {
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CodeElement ce = ea.elementList().get(i);
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if (ce instanceof TypeCheckInstruction ins && ins.opcode() == Opcode.CHECKCAST) {
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Assert.check
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(!(last_is_cast && last_ref == ins.type()),
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"Double cast found - Test failed");
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last_is_cast = true;
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last_ref = ins.type();
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} else {
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last_is_cast = false;
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}
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}
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}
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}
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