test/hotspot/jtreg/compiler/sharedstubs/SharedTrampolineTest.java

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/**
 * @test SharedTrampolineTest id=C2
 * @summary Checks that trampolines can be shared for static method.
 * @bug 8280152
 * @library /test/lib
 *
 * @requires vm.compiler2.enabled
 * @requires vm.opt.TieredCompilation == null
 * @requires os.arch=="aarch64" | os.arch=="riscv64"
 * @requires vm.debug
 *
 * @run driver compiler.sharedstubs.SharedTrampolineTest -XX:-TieredCompilation
 */

package compiler.sharedstubs;

import java.util.ArrayList;
import java.util.List;
import java.util.regex.Pattern;
import jdk.test.lib.process.OutputAnalyzer;
import jdk.test.lib.process.ProcessTools;

public class SharedTrampolineTest {
    private final static int ITERATIONS_TO_HEAT_LOOP = 20_000;

    private static void runTest(String compiler, String test) throws Exception {
        String testClassName = SharedTrampolineTest.class.getName() + "$" + test;
        ArrayList<String> command = new ArrayList<String>();
        command.add(compiler);
        command.add("-XX:+UnlockDiagnosticVMOptions");
        command.add("-Xbatch");
        command.add("-XX:+PrintRelocations");
        command.add("-XX:CompileCommand=compileonly," + testClassName + "::" + "test");
        command.add("-XX:CompileCommand=dontinline," + testClassName + "::" + "test");
        command.add("-XX:CompileCommand=dontinline," + testClassName + "::" + "log");
        command.add(testClassName);
        command.add("a");

        ProcessBuilder pb = ProcessTools.createTestJavaProcessBuilder(command);

        OutputAnalyzer analyzer = new OutputAnalyzer(pb.start());

        analyzer.shouldHaveExitValue(0);

        System.out.println(analyzer.getOutput());

        checkOutput(analyzer);
    }

    public static void main(String[] args) throws Exception {
        String[] tests = new String[] {"StaticMethodTest"};
        for (String test : tests) {
            runTest(args[0], test);
        }
    }

    private static void checkOutput(OutputAnalyzer output) {
        List<String> addrs = Pattern.compile("\\(trampoline_stub\\) addr=(\\w+) .*\\[trampoline owner")
            .matcher(output.getStdout())
            .results()
            .map(m -> m.group(1))
            .toList();
        if (addrs.stream().distinct().count() >= addrs.size()) {
            throw new RuntimeException("No runtime trampoline stubs reused: distinct " + addrs.stream().distinct().count() + ", in total " + addrs.size());
        }
    }

    public static class StaticMethodTest {
        private static void log(int i, String msg) {
        }

        static void test(int i, String[] args) {
            if (i % args.length == 0) {
                log(i, "args[0] = " + args[0]);
            } else {
                log(i, "No args");
            }
        }

        public static void main(String[] args) {
            for (int i = 1; i < ITERATIONS_TO_HEAT_LOOP; ++i) {
                test(i, args);
            }
        }
    }
}