3789983e89
Reviewed-by: darcy, ihse
81 lines
2.9 KiB
Java
81 lines
2.9 KiB
Java
/*
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* Copyright (c) 2016, 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 8148752
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* @summary Test correct casting of MH arguments during inlining.
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*
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* @run main compiler.jsr292.LongReferenceCastingTest
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*/
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package compiler.jsr292;
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import java.lang.invoke.MethodHandle;
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import java.lang.invoke.MethodHandles;
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import java.lang.invoke.MethodType;
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public class LongReferenceCastingTest {
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static final String MY_STRING = "myString";
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static final MethodHandle MH;
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static {
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try {
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MethodHandles.Lookup lookup = MethodHandles.lookup();
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MethodType mt = MethodType.methodType(String.class, long.class, Object.class, String.class);
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MH = lookup.findVirtual(LongReferenceCastingTest.class, "myMethod", mt);
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} catch (Exception e) {
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throw new Error(e);
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}
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}
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public String myMethod(long l, Object o, String s) {
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// The long argument occupies two stack slots, causing C2 to treat it as
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// two arguments and casting the fist one two long and the second one to Object.
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// As a result, Object o is casted to String and the o.toString() call is
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// inlined as String::toString(). We fail at runtime because 'o' is not a String.
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return o.toString();
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}
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public String toString() {
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return MY_STRING;
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}
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public static void main(String[] args) throws Exception {
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LongReferenceCastingTest test = new LongReferenceCastingTest();
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try {
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for (int i = 0; i < 20_000; ++i) {
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if (!test.invoke().equals(MY_STRING)) {
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throw new RuntimeException("Invalid string");
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}
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}
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} catch (Throwable t) {
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throw new RuntimeException("Test failed", t);
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}
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}
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public String invoke() throws Throwable {
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return (String) MH.invokeExact(this, 0L, (Object)this, MY_STRING);
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}
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}
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