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// Copyright (c) Microsoft. All rights reserved.
// Licensed under the MIT license. See LICENSE file in the project root for full license information.
//
// testing the JIT handling and GC reporting of "liveness" of GC variable
using System;
internal class Test
{
private class A
{
public A()
{
Console.WriteLine("A");
_iMember = 123;
Test.aExists = true;
}
~A()
{
Console.WriteLine("~A");
Test.aExists = false;
}
public bool F()
{
Console.WriteLine("A.F(): iMember = {0}", _iMember);
return true;
}
private volatile int _iMember;
}
public static volatile bool aExists = false;
public static int f1()
{
A a = new A();
a.F();
// Testcase 1
Console.WriteLine();
Console.WriteLine("Testcase 1");
if (!Test.aExists)
{
Console.WriteLine("Testcase 1 FAILED");
return -1;
}
a.F();
a = null;
return 100;
}
public static int f2()
{
A a = new A();
a.F();
a = null;
// Testcase 3
Console.WriteLine();
Console.WriteLine("Testcase 3");
if (!Test.aExists)
{
Console.WriteLine("Testcase 3 FAILED");
return -1;
}
return 100;
}
public static int f3()
{
A a = new A();
a.F();
a = null;
GC.Collect();
GC.WaitForPendingFinalizers();
A b = new A();
a = b;
GC.Collect();
GC.WaitForPendingFinalizers();
Console.WriteLine();
Console.WriteLine("Testcase 5");
if (!Test.aExists)
{
Console.WriteLine("Testcase 5 FAILED");
return -1;
}
GC.KeepAlive(b);
// Testcase 6
Console.WriteLine();
Console.WriteLine("Testcase 6");
if (b == null)
{
Console.WriteLine("Testcase 6 FAILED");
return -1;
}
b = null;
return 100;
}
private static int Main()
{
if (f1() != 100) return -1;
CleanGC();
// Testcase 2
Console.WriteLine();
Console.WriteLine("Testcase 2");
// here JIT should know a is not live anymore
if (Test.aExists)
{
Console.WriteLine("Testcase 2 FAILED");
return -1;
}
if (f2() != 100) return -1;
CleanGC();
// here JIT should know object a is not live anymore
// Testcase 4
Console.WriteLine();
Console.WriteLine("Testcase 4");
if (Test.aExists)
{
Console.WriteLine("Testcase 4 FAILED");
return -1;
}
if (f3() != 100) return -1;
CleanGC();
// here JIT should know object a is not live anymore
// Testcase 7
Console.WriteLine();
Console.WriteLine("Testcase 7");
if (Test.aExists)
{
Console.WriteLine("Testcase 7 FAILED");
return -1;
}
CleanGC();
Console.WriteLine("Test SUCCESS");
return 100;
}
private static void CleanGC()
{
GC.Collect();
GC.WaitForPendingFinalizers();
}
}
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