jdk-24/test/hotspot/jtreg/compiler/debug/TestStressCM.java

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package compiler.debug;

import jdk.test.lib.process.OutputAnalyzer;
import jdk.test.lib.process.ProcessTools;
import jdk.test.lib.Asserts;

/*
 * @test
 * @bug 8253765
 * @requires vm.debug == true & vm.compiler2.enabled
 * @summary Tests that, when compiling with StressLCM or StressGCM, using the
 *          same seed results in the same compilation. The output of
 *          PrintOptoStatistics is used to compare among compilations, instead
 *          of the more intuitive TraceOptoPipelining which prints
 *          non-deterministic memory addresses.
 * @library /test/lib /
 * @run driver compiler.debug.TestStressCM StressLCM
 * @run driver compiler.debug.TestStressCM StressGCM
 */

public class TestStressCM {

    static String optoStats(String stressOpt, int stressSeed) throws Exception {
        String className = TestStressCM.class.getName();
        String[] procArgs = {
            "-Xcomp", "-XX:-TieredCompilation",
            "-XX:CompileOnly=" + className + "::sum",
            "-XX:+PrintOptoStatistics", "-XX:+" + stressOpt,
            "-XX:StressSeed=" + stressSeed, className, "10"};
        ProcessBuilder pb  = ProcessTools.createJavaProcessBuilder(procArgs);
        OutputAnalyzer out = new OutputAnalyzer(pb.start());
        return out.getStdout();
    }

    static void sum(int n) {
        int acc = 0;
        for (int i = 0; i < n; i++) acc += i;
        System.out.println(acc);
    }

    public static void main(String[] args) throws Exception {
        if (args[0].startsWith("Stress")) {
            String stressOpt = args[0];
            Asserts.assertEQ(optoStats(stressOpt, 10), optoStats(stressOpt, 10),
                "got different optimization stats for the same seed");
        } else if (args.length > 0) {
            sum(Integer.parseInt(args[0]));
        }
    }
}