8068036: assert(is_available(index)) failed in G1 cset
Summary: Some verification code iterated over the heap using the region mapping array. This is not allowed. Changed to use the regular iteration method with closure.
Reviewed-by: jwilhelm, brutisso
#// Usage: jjs -fx -scripting logisticmap.js -- <initial_x> <R>
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// Logistic map viewer using Java8 Streams and JavaFX
// See also http://en.wikipedia.org/wiki/Logistic_map
if (!$OPTIONS._fx || arguments.length < 2) {
print("Usage: jjs -fx -scripting logisticmap.js -- <initial_x> <R>");
exit(1);
}
// parameters for the logistic map
var x = parseFloat(arguments[0]);
var R = parseFloat(arguments[1]);
var NUM_POINTS = arguments.length > 2? parseFloat(arguments[2]) : 20;
// Java classes used
var DoubleStream = Java.type('java.util.stream.DoubleStream');
var LineChart = Java.type("javafx.scene.chart.LineChart");
var NumberAxis = Java.type("javafx.scene.chart.NumberAxis");
var Scene = Java.type("javafx.scene.Scene");
var Stage = Java.type("javafx.stage.Stage");
var XYChart = Java.type("javafx.scene.chart.XYChart");
function start(stage) {
stage.title = "Logistic Map: initial x = ${x}, R = ${R}";
// make chart
var xAxis = new NumberAxis();
var yAxis = new NumberAxis();
var lineChart = new LineChart(xAxis, yAxis);
xAxis.setLabel("iteration");
yAxis.setLabel("x");
// make chart data series
var series = new XYChart.Series();
var data = series.data;
// populate data using logistic iteration
var i = 0;
DoubleStream
.generate(function() x = R*x*(1-x))
.limit(NUM_POINTS)
.forEach(
function(value) {
data.add(new XYChart.Data(i, value));
i++;
}
);
// add to stage
var scene = new Scene(lineChart, 800, 600);
lineChart.data.add(series);
stage.scene = scene;
stage.show();
}