| /* |
| * Copyright (c) 2016, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /** |
| * @test |
| * @bug 8148752 |
| * @summary Test correct casting of MH arguments during inlining. |
| * |
| * @run main compiler.jsr292.LongReferenceCastingTest |
| */ |
| |
| package compiler.jsr292; |
| |
| import java.lang.invoke.MethodHandle; |
| import java.lang.invoke.MethodHandles; |
| import java.lang.invoke.MethodType; |
| |
| public class LongReferenceCastingTest { |
| static final String MY_STRING = "myString"; |
| static final MethodHandle MH; |
| |
| static { |
| try { |
| MethodHandles.Lookup lookup = MethodHandles.lookup(); |
| MethodType mt = MethodType.methodType(String.class, long.class, Object.class, String.class); |
| MH = lookup.findVirtual(LongReferenceCastingTest.class, "myMethod", mt); |
| } catch (Exception e) { |
| throw new Error(e); |
| } |
| } |
| |
| public String myMethod(long l, Object o, String s) { |
| // The long argument occupies two stack slots, causing C2 to treat it as |
| // two arguments and casting the fist one two long and the second one to Object. |
| // As a result, Object o is casted to String and the o.toString() call is |
| // inlined as String::toString(). We fail at runtime because 'o' is not a String. |
| return o.toString(); |
| } |
| |
| public String toString() { |
| return MY_STRING; |
| } |
| |
| public static void main(String[] args) throws Exception { |
| LongReferenceCastingTest test = new LongReferenceCastingTest(); |
| try { |
| for (int i = 0; i < 20_000; ++i) { |
| if (!test.invoke().equals(MY_STRING)) { |
| throw new RuntimeException("Invalid string"); |
| } |
| } |
| } catch (Throwable t) { |
| throw new RuntimeException("Test failed", t); |
| } |
| } |
| |
| public String invoke() throws Throwable { |
| return (String) MH.invokeExact(this, 0L, (Object)this, MY_STRING); |
| } |
| } |