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/*
* Copyright Amazon.com Inc. 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.c2.aarch64;
import java.util.ArrayList;
import java.util.Iterator;
import jdk.test.lib.process.OutputAnalyzer;
import jdk.test.lib.process.ProcessTools;
/**
* @test TestTrampoline
* @summary Checks that trampolines to runtime code are not generated if they are not needed.
* @bug 8285487
* @library /test/lib
*
* @requires vm.flagless & os.arch=="aarch64" &
* vm.debug == false & vm.compiler2.enabled
*
* @run driver compiler.c2.aarch64.TestTrampoline
*/
public class TestTrampoline {
private final static int ITERATIONS_TO_HEAT_LOOP = 20_000;
public static void main(String[] args) throws Exception {
String testClassName = TestTrampoline.Test.class.getName();
ArrayList<String> command = new ArrayList<String>();
command.add("-XX:+UnlockDiagnosticVMOptions");
command.add("-Xbatch");
command.add("-XX:CompileCommand=print," + testClassName + "::" + "test");
// ReservedCodeCacheSize=130M causes generation of trampolines.
// As the non-nmethod segment is put between other two segments,
// runtime calls will be within 128M range.
// So there is no need for trampolines for runtime calls.
command.add("-XX:ReservedCodeCacheSize=130M");
command.add("-XX:+SegmentedCodeCache");
command.add(testClassName);
ProcessBuilder pb = ProcessTools.createLimitedTestJavaProcessBuilder(command);
OutputAnalyzer analyzer = new OutputAnalyzer(pb.start());
analyzer.shouldHaveExitValue(0);
System.out.println(analyzer.getOutput());
checkOutput(analyzer);
}
private static String skipTo(Iterator<String> iter, String substring) {
while (iter.hasNext()) {
String nextLine = iter.next();
if (nextLine.contains(substring)) {
return nextLine;
}
}
return null;
}
private static void checkOutput(OutputAnalyzer output) {
Iterator<String> iter = output.asLines().listIterator();
String match = skipTo(iter, "Compiled method (c2)");
if (match == null || !match.contains("Test::test")) {
throw new RuntimeException("Missing compiler output for the method 'test'");
}
match = skipTo(iter, "[Stub Code]");
if (match != null && skipTo(iter, "{trampoline_stub}") != null) {
throw new RuntimeException("Found unexpected {trampoline_stub}");
}
}
static class Test {
private static void test(String s, int i) {
if (s.charAt(i) > 128)
throw new RuntimeException();
}
public static void main(String[] args) {
String s = "Returns the char value at the specified index.";
for (int i = 0; i < ITERATIONS_TO_HEAT_LOOP; ++i) {
test(s, i % s.length());
}
}
}
}
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