GC Prototype testcase

hello.cs

// Simple testcase for verifying basic GC functionality
// (allocation, collection, root scanning, object scanning, write barriers)
using System;
using System.Collections.Generic;

public class Program {
	public string s;

	public static List<Program> list = new List<Program> ();

	public static int Main (string[] args)
	{
		const int N = 300000;

		// Allocate many objects
		for (int i = 0; i < N; i++) {
			Program p = new Program ();
			p.s = "Hello World";
			list.Add (p);
		}
		Console.WriteLine ("Hello World");
		GC.Collect ();
		// Replace some references, dirty some cards
		for (int i = N / 2; i < N; i++)
			list [i].s = new string ("Hello World2");
		GC.Collect ();
		// Make sure everything is still OK
		for (int i = 0; i < N / 2; i++) {
			if (list [i].s != "Hello World") {
				Console.WriteLine ("Hello World != {0}", list [i].s);
				return 1;
			}
		}
		for (int i = N / 2; i < N; i++) {
			if (list [i].s != "Hello World2") {
				Console.WriteLine ("Hello World2 != {0}", list [i].s);
				return 2;
			}
		}
		Console.WriteLine ("Hello world OK");
		return 0;
	}
}