Mercurial > hg > graal-jvmci-8
view test/compiler/types/TestTypePropagationToCmpU.java @ 23531:bf9d01d1dc6c jdk8u71-b07
Added tag jdk8u71-b06 for changeset 7dd34cca3538
author | asaha |
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date | Tue, 27 Oct 2015 13:28:23 -0700 |
parents | 68c65ae9f5db |
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/* * Copyright (c) 2015, 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 8080156 8060036 * @summary Test correctness of type propagation to CmpUNodes. * @run main TestTypePropagationToCmpU */ public class TestTypePropagationToCmpU { public static void main(String[] args) { try { // Trigger compilation for (int i = 0; i < 100_000; ++i) { test(); } } catch (NullPointerException e) { // Test should never throw a NullPointerException throw new RuntimeException("Test failed"); } } static int global = 42; public static void test() { int a = Integer.MIN_VALUE; int b = global; char[] buf = { 0 }; for (int i = 0; i <= b; ++i) { a = i - b; } // C2 adds a range check and an uncommon trap here to ensure that the array index // is in bounds. If type information is not propagated correctly to the corresponding // CmpUNode, this trap may be always taken. Because C2 also removes the unnecessary // allocation of 'buf', a NullPointerException is thrown in this case. char c = buf[(a * 11) / 2 - a]; // a is 0 here if global >= 0 buf[0] = 0; } }