private static ClassDisposeHandle CreateAction <TAction, TArg0>(TArg0 arg0, IntPtr pMethod, out TAction action)
where TAction : Delegate
where TArg0 : class
{
MethodTable *pMT = MethodTable.GetMethodTable <TAction>();
ObjectHeader *pThis = TypedReferenceHelper.ClassToPointer(arg0);
ObjectHeader *objHeader = (ObjectHeader *)RawMemoryManager.Allocate(pMT->BaseSize);
try
{
objHeader->SyncBlock = 0;
objHeader->MethodTable = pMT;
Byte *objBody = (Byte *)(objHeader + 1);
*(MethodTable ***)objBody = &pThis->MethodTable; // Delegate._target
*(IntPtr *)(objBody + 2 * sizeof(IntPtr)) = pMethod; // Delegate._methodPtr
action = TypedReferenceHelper.PointerToObject <TAction>(objHeader);
}
catch
{
RawMemoryManager.Free(pMT->BaseSize, objHeader);
throw;
}
return(new ClassDisposeHandle(pMT->BaseSize, objHeader));
}
public unsafe static T PointerToObject <T>(ObjectHeader *objectHeader) where T : class
{
MethodTable ** ppMT = &(objectHeader->MethodTable);
PublicTypedReference typedReference = new PublicTypedReference
{
Value = &ppMT,
Type = (void *)typeof(T).TypeHandle.Value,
};
return(__refvalue(*(TypedReference *)&typedReference, T));
}
/// <summary>
/// Similar with FormatterServices.GetUninitializedObject. Allocate and return zeroed T-typed object.
/// </summary>
public static ClassDisposeHandle UninitializedAllocation(Type t, out Object result)
{
MethodTable *mt = MethodTable.GetMethodTable(t);
int size = mt->BaseSize;
ObjectHeader *objHeader = (ObjectHeader *)RawMemoryManager.Allocate(size);
objHeader->SyncBlock = 0;
objHeader->MethodTable = mt;
RawMemoryManager.FillMemory(objHeader + 1, 0, size - sizeof(ObjectHeader));
result = TypedReferenceHelper.PointerToObject <Object>(objHeader);
return(new ClassDisposeHandle(size, objHeader));
}
public static ClassDisposeHandle Box <T>(T val, out Object boxed) where T : struct
{
MethodTable *mt = MethodTable.GetMethodTable <T>();
int size = mt->BaseSize;
ObjectHeader *objHeader = (ObjectHeader *)RawMemoryManager.Allocate(size);
void *src = TypedReferenceHelper.StructToPointer(ref val);
objHeader->SyncBlock = 0;
objHeader->MethodTable = mt;
RawMemoryManager.MemCpy(objHeader + 1, src, mt->DataSize);
boxed = TypedReferenceHelper.PointerToObject <Object>(objHeader);
return(new ClassDisposeHandle(size, objHeader));
}
public static ClassDisposeHandle AllocateSZArray <T>(int size, out T[] array)
{
MethodTable *pElementMT = MethodTable.GetMethodTable <T>();
MethodTable *pArrayMT = MethodTable.GetMethodTable <T[]>();
int elementSize = pElementMT->IsClass ? sizeof(IntPtr) : pElementMT->DataSize;
int memSize = sizeof(ObjectHeader) + sizeof(SZArrayHeader) + elementSize * size;
int align = sizeof(IntPtr) - 1;
memSize = (memSize + align) & (~align);
void * addr = RawMemoryManager.Allocate(memSize);
ObjectHeader * objHeader = (ObjectHeader *)addr;
SZArrayHeader *szArrayHeader = (SZArrayHeader *)(objHeader + 1);
objHeader->MethodTable = pArrayMT;
szArrayHeader->NumComponents = size;
array = TypedReferenceHelper.PointerToObject <T[]>(objHeader);
return(new ClassDisposeHandle(memSize, objHeader));
}
public static MethodTable **GetMethodTablePointer(ObjectHeader *headerPtr)
{
return((MethodTable **)((Int32 *)headerPtr + 1));
}
