[Webkit-unassigned] [Bug 170377] Got a crash on AreWeFastYet.com on Safari Technology Preview 26

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=170377

--- Comment #9 from Saam Barati <sbarati at apple.com> ---
The JS function:

function mergeJSON(blobs) {
    var lines = { };
    var timelist = [];

    // We're guaranteed the blobs are in sorted order, which makes this simpler.
    for (var i = 0; i < blobs.length; i++) {
        var blob = blobs[i];

        // Should we handle version changes better?
        if (blob.version != AWFYMaster.version) {
            window.location.reload();
            return;
        }

        for (var j = 0; j < blob.graph.lines.length; j++) {
            var blobline = blob.graph.lines[j];

            var line = lines[blobline.modeid];
            if (!line) {
                var points = [];
                var info = [];

                // We have to pre-fill the array with slots for each blob
                // we may have missed.
                for (var k = 0; k < timelist.length; k++) {
                    points.push(null);
                    info.push(null);
                }

                line = { points: points, info: info };
                lines[blobline.modeid] = line;
            }

            var points = line.points;
            var info = line.info;

            for (var k = 0; k < blobline.data.length; k++) {
                var point = blobline.data[k];
                var score = point && point[0]
                            ? point[0]
                            : null;
                points.push([timelist.length + k, score]);
                info.push(point);
            }
        }

        for (var j = 0; j < blob.graph.timelist.length; j++)
            timelist.push(blob.graph.timelist[j]);

        // If we missed updating any line, pre-fill it with null points.
        for (var modeid in lines) {
            var line = lines[modeid];
            if (line.points.length == timelist.length)
                continue;
            for (var j = line.points.length; j < timelist.length; j++) {
                line.points.push(null);
                line.info.push(null);
            }
        }
    }

    var actual = [];
    var info = [];
    for (var modename in lines) {
        if (!(modename in AWFYMaster.modes))
            continue;
        var line = { data: lines[modename].points,
                     color: AWFYMaster.modes[modename].color
                   };
        actual.push(line);
        info.push({ 'modeid': parseInt(modename),
                    'data': lines[modename].info });
    }

    var graph = { lines: actual,
                  aggregate: false,
                  timelist: timelist,
                  info: info
                };
    return graph;
}

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