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/*
* Copyright (c) 2014, 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.
*/
package compiler.codecache.stress;
import jdk.test.lib.Asserts;
import jdk.test.lib.ByteCodeLoader;
import jdk.test.lib.InfiniteLoop;
import sun.hotspot.WhiteBox;
import java.io.BufferedInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.concurrent.Callable;
public final class Helper {
public static final WhiteBox WHITE_BOX = WhiteBox.getWhiteBox();
private static final long THRESHOLD = WHITE_BOX.getIntxVMFlag("CompileThreshold");
private static final String TEST_CASE_IMPL_CLASS_NAME = "compiler.codecache.stress.Helper$TestCaseImpl";
private static byte[] CLASS_DATA;
static {
try {
CLASS_DATA = loadClassData(TEST_CASE_IMPL_CLASS_NAME);
} catch (IOException e) {
throw new Error("TESTBUG: cannot load class byte code " + TEST_CASE_IMPL_CLASS_NAME, e);
}
}
private Helper() {
}
public static void startInfiniteLoopThread(Runnable action) {
startInfiniteLoopThread(action, 0L);
}
public static void startInfiniteLoopThread(Runnable action, long millis) {
Thread t = new Thread(new InfiniteLoop(action, millis));
t.setDaemon(true);
t.start();
}
public static int callMethod(Callable<Integer> callable, int expected) {
int result = 0;
for (int i = 0; i < THRESHOLD; ++i) {
try {
result = callable.call();
} catch (Exception e) {
throw new AssertionError(
"Exception occurred during test method execution", e);
}
Asserts.assertEQ(result, expected, "Method returns unexpected value");
}
return result;
}
private static byte[] loadClassData(String name) throws IOException {
try (BufferedInputStream in = new BufferedInputStream(
ClassLoader.getSystemResourceAsStream(name.replace(".", "/")
+ ".class"))) {
ByteArrayOutputStream result = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int read;
while ((read = in.read(buffer)) != -1) {
result.write(buffer, 0, read);
}
return result.toByteArray();
}
}
public interface TestCase {
public static TestCase get() {
try {
Class clazz = ByteCodeLoader.load(
TEST_CASE_IMPL_CLASS_NAME, CLASS_DATA);
return (TestCase) clazz.newInstance();
} catch (ReflectiveOperationException e) {
throw new Error(String.format(
"TESTBUG: error while creating %s instance from reloaded class",
TEST_CASE_IMPL_CLASS_NAME), e);
}
}
Callable<Integer> getCallable();
int method();
int expectedValue();
}
public static class TestCaseImpl implements TestCase {
private static final int RETURN_VALUE = 42;
private static final int RECURSION_DEPTH = 10;
private volatile int i;
@Override
public Callable<Integer> getCallable() {
return () -> {
i = 0;
return method();
};
}
@Override
public int method() {
++i;
int result = RETURN_VALUE;
if (i < RECURSION_DEPTH) {
return result + method();
}
return result;
}
@Override
public int expectedValue() {
return RETURN_VALUE * RECURSION_DEPTH;
}
}
}
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