63 lines
2.5 KiB
Java
63 lines
2.5 KiB
Java
/*
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* Copyright (c) 2022, 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 8296318
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* @summary Loops inside infinite loops may not be detected, thus a region may still
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* be the loop head, even if it is not a LoopNode.
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* @run main/othervm -Xcomp -XX:-TieredCompilation
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* -XX:CompileCommand=compileonly,TestUndetectedLoopInInfiniteLoop::test*
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* -XX:PerMethodTrapLimit=0
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* TestUndetectedLoopInInfiniteLoop
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*/
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public class TestUndetectedLoopInInfiniteLoop {
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public static void main (String[] args) {
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test(true, false);
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}
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public static void test(boolean flag, boolean flag2) {
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int x = 0;
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if (flag2) { // runtime check, avoid infinite loop
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while (true) { // infinite loop (no exit)
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if (flag) {
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x++;
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}
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do { // inner loop
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// assert for this block
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// Region
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// Phi -> SubI -> XorI ---> Phi
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x = (x - 1) ^ 1;
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// Problem: this looks like a loop, but we have no LoopNode
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// We have no LoopNode, because this is all in an infinite
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// loop, and during PhaseIdealLoop::build_loop_tree we do not
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// attach the loops of an infinite loop to the loop tree,
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// and hence we do not get to call beautify_loop on these loops
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// which would have turned the Region into a LoopNode.
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} while (x < 0);
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}
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}
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}
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}
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