97 lines
3.2 KiB
Java
97 lines
3.2 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 8282218
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*
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* @run main/othervm -Xcomp -XX:TieredStopAtLevel=1
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* -XX:CompileCommand=compileonly,compiler.c1.TestClassConstantPatching$Test::run
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* compiler.c1.TestClassConstantPatching
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*/
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package compiler.c1;
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import java.io.File;
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import java.io.IOException;
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import java.io.InputStream;
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import java.lang.reflect.Method;
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public class TestClassConstantPatching {
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public static int COUNTER = 0;
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static class CustomLoader extends ClassLoader {
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@Override
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protected Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException {
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if (name.startsWith(Test.class.getName())) {
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Class<?> c = findLoadedClass(name);
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if (c != null) {
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return c;
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}
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try {
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COUNTER++; // update counter on loading
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InputStream in = getSystemResourceAsStream(name.replace('.', File.separatorChar) + ".class");
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byte[] buf = in.readAllBytes();
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return defineClass(name, buf, 0, buf.length);
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} catch (IOException e) {
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throw new ClassNotFoundException(name);
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}
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}
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return super.loadClass(name, resolve);
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}
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}
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public static class Test {
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static class T {}
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public static Class<?> run(boolean cond) {
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int before = COUNTER;
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Class<?> c = null;
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if (cond) {
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c = T.class;
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}
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int after = COUNTER;
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if (cond && before == after) {
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throw new AssertionError("missed update");
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}
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return c;
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}
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}
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public static void main(String[] args) throws ReflectiveOperationException {
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ClassLoader cl = new CustomLoader();
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Class.forName(TestClassConstantPatching.class.getName(), true, cl); // preload counter holder class
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Class<?> test = Class.forName(Test.class.getName(), true, cl);
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Method m = test.getDeclaredMethod("run", boolean.class);
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m.invoke(null, false);
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m.invoke(null, true);
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System.out.println("TEST PASSED");
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}
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}
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