TestStressIGVNAndCCP.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 8256535
 * @requires vm.debug == true & vm.compiler2.enabled
 * @summary Tests that stress compilations with the same seed yield the same
 *          IGVN and CCP traces.
 * @library /test/lib /
 * @run driver compiler.debug.TestStressIGVNAndCCP
 */

public class TestStressIGVNAndCCP {

    static String phaseTrace(String stressOption, String traceOption,
                             int stressSeed) throws Exception {
        String className = TestStressIGVNAndCCP.class.getName();
        String[] procArgs = {
            "-Xcomp", "-XX:-TieredCompilation", "-XX:-Inline",
            "-XX:CompileOnly=" + className + "::sum", "-XX:+" + traceOption,
            "-XX:+" + stressOption, "-XX:StressSeed=" + stressSeed,
            className, "10"};
        ProcessBuilder pb  = ProcessTools.createJavaProcessBuilder(procArgs);
        OutputAnalyzer out = new OutputAnalyzer(pb.start());
        out.shouldHaveExitValue(0);
        return out.getStdout();
    }

    static String igvnTrace(int stressSeed) throws Exception {
        return phaseTrace("StressIGVN", "TraceIterativeGVN", stressSeed);
    }

    static String ccpTrace(int stressSeed) throws Exception {
        return phaseTrace("StressCCP", "TracePhaseCCP", stressSeed);
    }

    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) {
            for (int s = 0; s < 10; s++) {
                Asserts.assertEQ(igvnTrace(s), igvnTrace(s),
                    "got different IGVN traces for the same seed");
                Asserts.assertEQ(ccpTrace(s), ccpTrace(s),
                    "got different CCP traces for the same seed");
            }
        } else if (args.length > 0) {
            sum(Integer.parseInt(args[0]));
        }
    }
}