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8306933: C2: "assert(false) failed: infinite loop" failure

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Reviewed-by: chagedorn, thartmann
This commit is contained in:
Roland Westrelin 2023-05-03 11:14:53 +00:00
parent e9807a4b0f
commit ccf91f881c
2 changed files with 61 additions and 3 deletions
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3
src/hotspot/share/opto/compile.cpp
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@ -4019,9 +4019,6 @@ bool Compile::final_graph_reshaping() {
// must be infinite loops. // must be infinite loops.
for (DUIterator_Fast jmax, j = n->fast_outs(jmax); j < jmax; j++) for (DUIterator_Fast jmax, j = n->fast_outs(jmax); j < jmax; j++)
if (!frc._visited.test(n->fast_out(j)->_idx)) { if (!frc._visited.test(n->fast_out(j)->_idx)) {
DEBUG_ONLY( n->fast_out(j)->dump(); );
DEBUG_ONLY( n->dump_bfs(1, 0, "-"); );
assert(false, "infinite loop");
record_method_not_compilable("infinite loop"); record_method_not_compilable("infinite loop");
return true; // Found unvisited kid; must be unreach return true; // Found unvisited kid; must be unreach
} }

61
test/hotspot/jtreg/compiler/c2/TestInfiniteLoopCompilationFailure.java Normal file
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@ -0,0 +1,61 @@
/*
* Copyright (c) 2023, Red Hat, Inc. 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 8306933
* @summary C2: "assert(false) failed: infinite loop" failure
* @run main/othervm -Xcomp -XX:CompileOnly=TestInfiniteLoopCompilationFailure::test -XX:-UseLoopPredicate -XX:-UseProfiledLoopPredicate
* -XX:+UnlockDiagnosticVMOptions -XX:+StressIGVN -XX:StressSeed=675320863 TestInfiniteLoopCompilationFailure
* @run main/othervm -Xcomp -XX:CompileOnly=TestInfiniteLoopCompilationFailure::test -XX:-UseLoopPredicate -XX:-UseProfiledLoopPredicate
* -XX:+UnlockDiagnosticVMOptions -XX:+StressIGVN TestInfiniteLoopCompilationFailure
*/
public class TestInfiniteLoopCompilationFailure {
public static void main(String[] args) {
int[][] array = { new int[100] };
test(false, 0, array);
}
private static void test(boolean flag, int i, int[][] array) {
if (flag) {
int[] array2;
array2 = array[i];
int j;
for (j = 0; j < 10; j++) {
}
int k;
if (j == 10) {
k = i;
} else {
k = 0;
}
int v = array2[k];
for (;;) {
v += array[i][i];
}
}
}
}