public void No_Reference_Allows_GC()
{
var obj = new Object();
var gcTester = new GCWatch(obj);
obj = null;
Assert.IsTrue(gcTester.IsEligibleForGC());
}
public void GivenLazyTransformStreamWithStream_WhenDisposing_IsDisposedCorrectly()
{
var inputStream = _recyclableMemoryStreamManager.GetStream("GivenLazyTransformStreamWithStream_WhenDisposing_IsDisposedCorrectly.TestData", TestData, 0, TestData.Length);
GCWatch gcWatch = GetGCWatch(inputStream, ReadAndCreateNewStream);
inputStream.Dispose();
inputStream = null;
Assert.True(gcWatch.IsAlive);
}
public void Reference_Keeps_Object_Alive_Or_Not()
{
var obj = new Object();
var gcTester = new GCWatch(obj);
#if DEBUG
Assert.IsFalse(gcTester.IsEligibleForGC());
#else
Assert.IsTrue(gcTester.IsEligibleForGC());
#endif
}
private static GCWatch GetGCWatch <T>(T inputData, Func <T, Stream> transformFunction)
{
var lazyTransform = new LazyTransformReadOnlyStream <T>(inputData, transformFunction);
var result = new GCWatch(lazyTransform);
// Read the entire stream
var outputBuffer = new byte[lazyTransform.Length];
lazyTransform.Read(outputBuffer, 0, outputBuffer.Length);
return(result);
}
public void GC_Collects_Graph()
{
var foo1 = new Foo();
var foo2 = new Foo();
var gcTester1 = new GCWatch(foo1);
var gcTester2 = new GCWatch(foo2);
foo1.objects.Add(foo2);
foo2.objects.Add(foo1);
foo1 = null;
Assert.IsFalse(gcTester1.IsEligibleForGC());
Assert.IsFalse(gcTester2.IsEligibleForGC());
GC.KeepAlive(foo2);
foo2 = null;
Assert.IsTrue(gcTester1.IsEligibleForGC());
Assert.IsTrue(gcTester2.IsEligibleForGC());
}
public static void CollectGarbage()
{
GCWatch.Start();
// 从stack出发
foreach (var thread in ThreadManager.Threads)
{
// 要保证GC执行期间线程全部停止
for (uint i = 0; i < thread.Stack.SP; ++i)
{
if (thread.Stack.Slots[i].DataTag == SlotDataTag.ADDRESS)
{
MarkObject(thread.Stack.GetAddress(i));
}
}
}
// 从类的静态区出发
foreach (var staticClassData in StaticArea.Singleton.DataMap.Values)
{
uint addr = MemoryMap.MapToAbsolute(staticClassData.Offset, MemoryTag.STATIC);
ModuleLoader.Classes.TryGetValue(addr, out VMClass vmClass);
foreach (var staticField in vmClass.StaticFields)
{
if (staticField.Type.Tag == VariableTypeTag.ADDRESS)
{
// 是地址
MarkObject(BitConverter.ToUInt32(staticClassData.Data, staticField.Offset));
}
}
}
// 回收
LinkedListNode <HeapData> cur = Heap.Singleton.Data.First;
while (cur != null)
{
if ((cur.Value.GCInfo & (uint)GCTag.GCMark) == 0)
{
// 不可达对象，删除
LinkedListNode <HeapData> tmp = cur;
cur = cur.Next;
Heap.Singleton.DataMap.Remove(tmp.Value.Offset);
Heap.Singleton.Data.Remove(tmp);
Heap.Singleton.Size -= tmp.Value.Data.Length;
FreedSize += tmp.Value.Data.Length / 1024;
}
else
{
// 清除GCMark
cur.Value.GCInfo = cur.Value.GCInfo & (~(uint)GCTag.GCMark);
cur = cur.Next;
}
}
GCWatch.Stop();
GCTotalTime += GCWatch.ElapsedMilliseconds;
if (GCWatch.ElapsedMilliseconds > GCMaxTime)
{
GCMaxTime = GCWatch.ElapsedMilliseconds;
}
GCCount++;
}
public void Usable_Reference_Keeps_Object_Alive()
{
var obj = new Object();
var gcTester = new GCWatch(obj);
Assert.IsFalse(gcTester.IsEligibleForGC());
GC.KeepAlive(obj);
}
public void GivenLazyTransformStreamWithByteArray_WhenDisposing_IsDisposedCorrectly()
{
GCWatch gcWatch = GetGCWatch(TestData, ReverseByteArray);
Assert.True(gcWatch.IsAlive);
}