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undefect. CWE-407 — 63 sites patched across 27 ecosystems

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Authors: russell@unturf.com · brackishbert@gmail.com · foxhop.net · TimeHexOn.com

Patches, unit tests, benchmarks, whitepaper, and outreach briefs.
Public domain — no copyright claimed. Use freely.
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russell@unturf.com 2026-03-26 17:11:57 -04:00
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test/hotspot/jtreg/compiler/loopopts/TestPreMainPostFallInEdges.java Normal file
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/*
* Copyright (c) 2020, 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 8249602
* @summary Tests the rewiring and cloning of fall-in values from the main loop (and pre loop) to the post (and main loop)
* which resulted in a DUIterator_Fast assertion failure due to an insertion in the outputs of the loop header node.
*
* @run main compiler.loopopts.TestPreMainPostFallInEdges
*/
package compiler.loopopts;
public class TestPreMainPostFallInEdges {
public static int test() {
int iArr[] = new int[400];
float fArr[] = new float[400];
int x = 0;
byte y = 124;
short z = 0;
int i = 1;
do {
int j = 1;
do {
z *= 11;
// These 4 array stores live in the back control block and cannot float. They are cloned and their control input set to the preheader control
// block of the post loop. If their input edges also have their placement in the back control block (get_ctrl == back control) then they are
// cloned as well. The following code hits the assertion failure when we clone a node with a control edge to the loop header block of the main.
// loop. The DUIterator_Fast does not allow insertions. The fix is to replace it by a normal DUIterator which allows insertions.
iArr[j] = 3;
// load of iArr[j + 1] is also cloned but has a control edge to the main loop header block hitting the assertion failure.
iArr[j + 1] += 4;
fArr[j] = 5;
fArr[j + 1] += fArr[j + 5]; // same for load of fArr[j + 1] and load of fArr[j + 5]
int k = 1;
do {
iArr[j] *= 324;
x = 34;
y *= 54;
} while (k < 1);
} while (++j < 6);
} while (++i < 289);
return checkSum(iArr) + checkSum(fArr);
}
public static int checkSum(int[] a) {
int sum = 0;
for (int j = 0; j < a.length; j++) {
sum += a[j] % (j + 1);
}
return sum;
}
public static int checkSum(float[] a) {
int sum = 0;
for (int j = 0; j < a.length; j++) {
sum += a[j] % (j + 1);
}
return sum;
}
public static void main(String[] strArr) {
for (int i = 0; i < 10000; i++) {
test();
}
}
}