Compare parser implemented in SpiderMonkey

20190416.js

// This file should be copied to the top-level directory of real-js-samples to
// compare the legacy parser with the rust parser.

var dir = "20190416";
var mode = "script";
var runs_per_script = 1;
var filter_out = [
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    ".",
    ".."
];

var name_1 = "SpiderMonkey legacy parser";
function parse_1(path) {
    var start = performance.now();
    parse(path, { module: mode == "module", rustFrontend: false });
    return performance.now() - start;
}

var name_2 = "Vision experimental parser";
function parse_2(path) {
    var start = performance.now();
    parse(path, { module: mode == "module", rustFrontend: true });
    return performance.now() - start;
}

var path = "", content = "";
var t_1= 0, t_2 = 0, time_1 = 0, time_2 = 0, count = 0, count_bytes = 0;
var list = os.file.listDir(dir);
var f = 0;
for (var file of list) {
    f++;
    if (filter_out.includes(file)) {
        continue;
    }

    path = os.path.join(dir, file);
    try {
        // print(Math.round(100 * f / list.length), file);
        content = os.file.readRelativeToScript(path);
        for (var i = 0; i < runs_per_script; i++) {
            // Randomize the order in which parsers are executed as they are
            // executed in the same process and the parsed content might be
            // faster to load for the second parser as it is already in memory.
            if (Math.random() > 0.5) {
                t_1 = parse_1(content);
                t_2 = parse_2(content);
            } else {
                t_2 = parse_2(content);
                t_1 = parse_1(content);
            }
            time_1 += t_1;
            time_2 += t_2;
        }
        count++;
        count_bytes += content.length;
    } catch (e) {
        // ignore all errors for now.
    }
}

var total_bytes = count * count_bytes * runs_per_script;
print(name_1, "\t", time_1, "ms\t");
print(name_2, "\t", time_2, "ms\t");
print("Total number of bytes parsed:\t", total_bytes);
print("Total number of scripts parsed:\t", count * runs_per_script);