author | pgovereau |
Wed, 09 Apr 2014 17:41:27 +0100 | |
changeset 23812 | a53aa842f5cf |
child 28800 | 35f9042d53b3 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2014, 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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/* |
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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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* @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 com.sun.tools.classfile.*; |
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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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} |
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} |
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public static void main(String... cmdline) throws Exception { |
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ClassFile cls = ClassFile.read(DoubleCastTest.class.getResourceAsStream("DoubleCastTest$C.class")); |
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for (Method m: cls.methods) |
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check(m); |
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} |
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static void check(Method m) throws Exception { |
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boolean last_is_cast = false; |
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int last_ref = 0; |
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Code_attribute ea = (Code_attribute)m.attributes.get(Attribute.Code); |
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for (Instruction i : ea.getInstructions()) { |
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if (i.getOpcode() == Opcode.CHECKCAST) { |
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Assert.check |
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(!(last_is_cast && last_ref == i.getUnsignedShort(1)), |
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"Double cast found - Test failed"); |
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last_is_cast = true; |
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last_ref = i.getUnsignedShort(1); |
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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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} |