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69 lines
2.6 KiB
Java
69 lines
2.6 KiB
Java
/*
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* Copyright (c) 2026, 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 8374582
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* @summary Tests handling of invalid array indices in C2 intrinsic if explicit range check in Java code is not inlined.
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* @modules java.base/jdk.internal.access
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* @run main/othervm
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* -XX:CompileCommand=inline,java.lang.StringCoding::*
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* -XX:CompileCommand=exclude,jdk.internal.util.Preconditions::checkFromIndexSize
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* ${test.main.class}
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*/
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package compiler.intrinsics.string;
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import jdk.internal.access.JavaLangAccess;
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import jdk.internal.access.SharedSecrets;
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public class TestRangeCheck {
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private static final JavaLangAccess JLA = SharedSecrets.getJavaLangAccess();
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public static void main(String[] args) {
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byte[] bytes = new byte[42];
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for (int i = 0; i < 10_000; ++i) {
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test(bytes);
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}
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}
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private static int test(byte[] bytes) {
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try {
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// Calling `StringCoding::countPositives`, which is a "front door"
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// to the `StringCoding::countPositives0` intrinsic.
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// `countPositives` validates its input using
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// `Preconditions::checkFromIndexSize`, which also maps to an
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// intrinsic. When `checkFromIndexSize` is not inlined, C2 does not
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// know about the explicit range checks, and does not cut off the
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// dead code. As a result, an invalid value (e.g., `-1`) can be fed
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// as input into the `countPositives0` intrinsic, got replaced
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// by TOP, and cause a failure in the matcher.
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return JLA.countPositives(bytes, -1, 42);
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} catch (Exception e) {
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return 0;
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}
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}
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}
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