/// <summary>
/// Marks all objects referenced
/// </summary>
/// <param name="obj"></param>
/// <param name="type"></param>
public static void SweepTypedObject(uint *obj, uint type)
{
if (obj == null)
{
return;
}
uint fields = VTablesImpl.GetGCFieldCount(type);
var offsets = VTablesImpl.GetGCFieldOffsets(type);
var types = VTablesImpl.GetGCFieldTypes(type);
for (int i = 0; i < fields; i++)
{
if (!VTablesImpl.IsValueType(types[i]))
{
var location = (uint *)((byte *)obj + offsets[i]) + 1; // +1 since we are only using 32bits from the 64bit
if (*location != 0) // Check if its null
{
location = *(uint **)location;
if (RAT.GetPageType(location) == RAT.PageType.HeapSmall)
{
MarkAndSweepObject(location);
}
}
}
else if (VTablesImpl.IsStruct(types[i]))
{
var obj1 = (uint *)((byte *)obj + offsets[i]);
SweepTypedObject(obj1, types[i]);
}
}
}
public static unsafe Array AllocateNewArray(int *aTypeHandle, int aLength, uint aGCFlags)
{
if (aGCFlags != 0 && aGCFlags != 16) // 16 means that zeroing is optional
{
var debugger = new Debugger("Plug", "GC");
debugger.Send($"-- AllocateNewArray -- Invalid aGCFlags: {aGCFlags}");
Debugger.DoBochsBreak();
throw new NotImplementedException();
}
var aSize = (int)VTablesImpl.GetSize((uint)*aTypeHandle);
return(CreateNewArray(aSize, aLength));
}
private void TestVTablesImpl()
{
object obj = new object();
Assert.AreEqual(GCImplementation.GetType(obj), ((CosmosRuntimeType)obj.GetType()).mTypeId, "Both methods to get type id return the same value for object");
string s = "a";
Assert.AreEqual(GCImplementation.GetType(s), ((CosmosRuntimeType)s.GetType()).mTypeId, "Both methods to get type id return the same value for string");
Assert.AreEqual(GCImplementation.GetType(s), ((CosmosRuntimeType)typeof(string)).mTypeId, "Methods and constato get type id return the same value for string");
List <int> x = new List <int>();
Assert.AreEqual(GCImplementation.GetType(x), ((CosmosRuntimeType)typeof(List <int>)).mTypeId, "Methods and constant get type id return the same value for List<int>");
TestType tObj = new TestType();
Assert.AreEqual(GCImplementation.GetType(tObj), ((CosmosRuntimeType)typeof(TestType)).mTypeId, "Methods and constant get type id return the same value for TestType");
Assert.AreEqual(4, VTablesImpl.GetGCFieldCount(GCImplementation.GetType(tObj)), "TestType has 4 fields tracked by GC");
var types = VTablesImpl.GetGCFieldTypes(GCImplementation.GetType(tObj));
Assert.AreEqual(4, types.Length, "GetGCFieldTypes returns correct number of values");
Assert.AreEqual(((CosmosRuntimeType)typeof(object)).mTypeId, types[0], "GetGCFieldTypes returns object at offset 0");
Assert.AreEqual(((CosmosRuntimeType)typeof(List <int>)).mTypeId, types[1], "GetGCFieldTypes returns List<int> at offset 1");
Assert.AreEqual(((CosmosRuntimeType)typeof(string)).mTypeId, types[2], "GetGCFieldTypes returns string at offset 2");
Assert.AreEqual(((CosmosRuntimeType)typeof(object)).mTypeId, types[3], "GetGCFieldTypes returns object at offset 3");
Assert.AreEqual(4, VTablesImpl.GetGCFieldOffsets(GCImplementation.GetType(tObj)).Length, "GetGCFieldOffsets returned the correct number of values");
Assert.AreEqual(new uint[] { 12, 20, 28, 36 }, VTablesImpl.GetGCFieldOffsets(GCImplementation.GetType(tObj)), "GetGCFieldOffsets returns the correct values");
ClassWithStruct classWithStruct = new ClassWithStruct();
Assert.AreEqual(3, VTablesImpl.GetGCFieldCount(GCImplementation.GetType(classWithStruct)), "ClassWithStruct has 3 fields tracked by GC");
types = VTablesImpl.GetGCFieldTypes(GCImplementation.GetType(classWithStruct));
Assert.AreEqual(((CosmosRuntimeType)typeof(object)).mTypeId, types[0], "GetGCFieldTypes returns object at offset 0");
Assert.AreEqual(((CosmosRuntimeType)typeof(TestStruct)).mTypeId, types[1], "GetGCFieldTypes returns TestStruct at offset 1");
Assert.AreEqual(((CosmosRuntimeType)typeof(object)).mTypeId, types[2], "GetGCFieldTypes returns object at offset 2");
}
private static bool ContainsReference(uint mType)
{
if (!VTablesImpl.IsValueType(mType))
{
return(true);
}
else if (VTablesImpl.IsStruct(mType))
{
var fields = VTablesImpl.GetGCFieldTypes(mType);
for (int i = 0; i < fields.Length; i++)
{
if (ContainsReference(fields[i]))
{
return(true);
}
}
return(false);
}
else
{
return(false);
}
}
/// <summary>
/// Marks a GC managed object as referenced and recursivly marks child objects as well
/// </summary>
/// <param name="aPtr"></param>
public static void MarkAndSweepObject(void *aPtr)
{
var gcPointer = (ObjectGCStatus *)aPtr;
if ((gcPointer[-1] & ObjectGCStatus.Hit) == ObjectGCStatus.Hit)
{
return; // we already hit this object
}
// Mark
gcPointer[-1] |= ObjectGCStatus.Hit;
// Sweep
uint *obj = (uint *)aPtr;
// Check what we are dealing with
if (*(obj + 1) == (uint)ObjectUtils.InstanceTypeEnum.NormalObject)
{
if (_StringType == 0)
{
_StringType = GetStringTypeID();
}
var type = *obj;
// Deal with strings first
if (type == _StringType)
{
return; // we are done since they dont hold any reference to fields
}
SweepTypedObject(obj, type);
}
else if (*(obj + 1) == (uint)ObjectUtils.InstanceTypeEnum.Array)
{
var elementType = *obj;
var length = *(obj + 2);
var size = *(obj + 3);
if (VTablesImpl.IsValueType(elementType))
{
if (VTablesImpl.IsStruct(elementType))
{
for (int i = 0; i < length; i++)
{
var location = (uint *)((byte *)obj + size * i) + 4;
SweepTypedObject(location, elementType);
}
}
}
else
{
for (int i = 0; i < length; i++)
{
var location = (uint *)((byte *)obj + size * i) + 4 + 1;
if (*location != 0)
{
location = *(uint **)location;
if (RAT.GetPageType(location) == RAT.PageType.HeapSmall) // so we dont try free string literals
{
MarkAndSweepObject(location);
}
}
}
}
}
else if (*(obj + 1) == (uint)ObjectUtils.InstanceTypeEnum.BoxedValueType)
{
// do nothing
}
}
