TestStressIGVN.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 8252219
 * @requires vm.compiler2.enabled
 * @summary Tests that compilations with the same seed yield the same IGVN
 *          trace, and compilations with different seeds yield different IGVN
 *          traces.
 * @library /test/lib /
 * @run driver compiler.debug.TestStressIGVN
 */

public class TestStressIGVN {

    static String igvnTrace(int stressSeed) throws Exception {
        String className = TestStressIGVN.class.getName();
        String[] procArgs = {
            "-Xcomp", "-XX:-TieredCompilation",
            "-XX:CompileOnly=" + className + "::sum", "-XX:+TraceIterativeGVN",
            "-XX:+StressIGVN", "-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.length == 0) {
            Asserts.assertEQ(igvnTrace(10), igvnTrace(10),
                "got different IGVN traces for the same seed");
            Asserts.assertNE(igvnTrace(10), igvnTrace(20),
                "got the same IGVN trace for different seeds");
        } else if (args.length > 0) {
            sum(Integer.parseInt(args[0]));
        }
    }
}