private static PInvokeDelegateThunk AllocateThunk(Delegate del)
{
if (s_thunkPoolHeap == null)
{
// TODO: Free s_thunkPoolHeap if the thread lose the race
Interlocked.CompareExchange(
ref s_thunkPoolHeap,
RuntimeAugments.CreateThunksHeap(RuntimeImports.GetInteropCommonStubAddress()),
null
);
Debug.Assert(s_thunkPoolHeap != null);
}
var delegateThunk = new PInvokeDelegateThunk(del);
//
// For open static delegates set target to ReverseOpenStaticDelegateStub which calls the static function pointer directly
//
bool openStaticDelegate = del.GetRawFunctionPointerForOpenStaticDelegate() != IntPtr.Zero;
IntPtr pTarget = RuntimeInteropData.GetDelegateMarshallingStub(del.GetTypeHandle(), openStaticDelegate);
Debug.Assert(pTarget != IntPtr.Zero);
RuntimeAugments.SetThunkData(s_thunkPoolHeap, delegateThunk.Thunk, delegateThunk.ContextData, pTarget);
return(delegateThunk);
}
public static unsafe void StructureToPtr(object structure, IntPtr ptr, bool fDeleteOld)
{
if (structure == null)
{
throw new ArgumentNullException(nameof(structure));
}
if (ptr == IntPtr.Zero)
{
throw new ArgumentNullException(nameof(ptr));
}
if (fDeleteOld)
{
DestroyStructure(ptr, structure.GetType());
}
RuntimeTypeHandle structureTypeHandle = structure.GetType().TypeHandle;
if (structureTypeHandle.IsGenericType() || structureTypeHandle.IsGenericTypeDefinition())
{
throw new ArgumentException(SR.Argument_NeedNonGenericObject, nameof(structure));
}
IntPtr marshalStub;
if (structureTypeHandle.IsBlittable())
{
if (!RuntimeInteropData.TryGetStructMarshalStub(structureTypeHandle, out marshalStub))
{
marshalStub = IntPtr.Zero;
}
}
else
{
marshalStub = RuntimeInteropData.GetStructMarshalStub(structureTypeHandle);
}
if (marshalStub != IntPtr.Zero)
{
if (structureTypeHandle.IsValueType())
{
((delegate * < ref byte, ref byte, void >)marshalStub)(ref structure.GetRawData(), ref *(byte *)ptr);
}
else
{
((delegate * < object, ref byte, void >)marshalStub)(structure, ref *(byte *)ptr);
}
}
else
{
nuint size = (nuint)RuntimeInteropData.GetStructUnsafeStructSize(structureTypeHandle);
Buffer.Memmove(ref *(byte *)ptr, ref structure.GetRawData(), size);
}
}
/// <summary>
/// Retrieve the corresponding P/invoke instance from the stub
/// </summary>
public static unsafe Delegate?GetDelegateForFunctionPointer(IntPtr ptr, RuntimeTypeHandle delegateType)
{
if (ptr == IntPtr.Zero)
{
return(null);
}
//
// First try to see if this is one of the thunks we've allocated when we marshal a managed
// delegate to native code
// s_thunkPoolHeap will be null if there isn't any managed delegate to native
//
IntPtr pContext;
IntPtr pTarget;
if (s_thunkPoolHeap != null && RuntimeAugments.TryGetThunkData(s_thunkPoolHeap, ptr, out pContext, out pTarget))
{
GCHandle handle;
unsafe
{
// Pull out Handle from context
handle = ((ThunkContextData *)pContext)->Handle;
}
Delegate target = Unsafe.As <Delegate>(handle.Target);
//
// The delegate might already been garbage collected
// User should use GC.KeepAlive or whatever ways necessary to keep the delegate alive
// until they are done with the native function pointer
//
if (target == null)
{
Environment.FailFast(SR.Delegate_GarbageCollected);
}
return(target);
}
//
// Otherwise, the stub must be a pure native function pointer
// We need to create the delegate that points to the invoke method of a
// NativeFunctionPointerWrapper derived class
//
IntPtr pDelegateCreationStub = RuntimeInteropData.GetForwardDelegateCreationStub(delegateType);
Debug.Assert(pDelegateCreationStub != IntPtr.Zero);
return(((delegate * < IntPtr, Delegate >)pDelegateCreationStub)(ptr));
}
public static unsafe void DestroyStructure(IntPtr ptr, Type structuretype)
{
if (ptr == IntPtr.Zero)
{
throw new ArgumentNullException(nameof(ptr));
}
if (structuretype == null)
{
throw new ArgumentNullException(nameof(structuretype));
}
RuntimeTypeHandle structureTypeHandle = structuretype.TypeHandle;
if (structureTypeHandle.IsGenericType() || structureTypeHandle.IsGenericTypeDefinition())
{
throw new ArgumentException(SR.Argument_NeedNonGenericType, nameof(structuretype));
}
if (structureTypeHandle.IsEnum() ||
structureTypeHandle.IsInterface() ||
InteropExtensions.AreTypesAssignable(typeof(Delegate).TypeHandle, structureTypeHandle))
{
throw new ArgumentException(SR.Format(SR.Argument_MustHaveLayoutOrBeBlittable, structureTypeHandle.LastResortToString));
}
if (structureTypeHandle.IsBlittable())
{
// ok to call with blittable structure, but no work to do in this case.
return;
}
IntPtr destroyStructureStub = RuntimeInteropData.GetDestroyStructureStub(structureTypeHandle, out bool hasInvalidLayout);
if (hasInvalidLayout)
{
throw new ArgumentException(SR.Format(SR.Argument_MustHaveLayoutOrBeBlittable, structureTypeHandle.LastResortToString));
}
// DestroyStructureStub == IntPtr.Zero means its fields don't need to be destroyed
if (destroyStructureStub != IntPtr.Zero)
{
((delegate * < ref byte, void >)destroyStructureStub)(ref *(byte *)ptr);
}
}
public static IntPtr OffsetOf(Type t, string fieldName)
{
if (t == null)
{
throw new ArgumentNullException(nameof(t));
}
if (string.IsNullOrEmpty(fieldName))
{
throw new ArgumentNullException(nameof(fieldName));
}
if (t.TypeHandle.IsGenericTypeDefinition())
{
throw new ArgumentException(SR.Argument_NeedNonGenericType, nameof(t));
}
return(new IntPtr(RuntimeInteropData.GetStructFieldOffset(t.TypeHandle, fieldName)));
}
internal static unsafe void PtrToStructureImpl(IntPtr ptr, object structure)
{
RuntimeTypeHandle structureTypeHandle = structure.GetType().TypeHandle;
IntPtr unmarshalStub;
if (structureTypeHandle.IsBlittable())
{
if (!RuntimeInteropData.TryGetStructUnmarshalStub(structureTypeHandle, out unmarshalStub))
{
unmarshalStub = IntPtr.Zero;
}
}
else
{
unmarshalStub = RuntimeInteropData.GetStructUnmarshalStub(structureTypeHandle);
}
if (unmarshalStub != IntPtr.Zero)
{
if (structureTypeHandle.IsValueType())
{
((delegate * < ref byte, ref byte, void >)unmarshalStub)(ref *(byte *)ptr, ref structure.GetRawData());
}
else
{
((delegate * < ref byte, object, void >)unmarshalStub)(ref *(byte *)ptr, structure);
}
}
else
{
nuint size = (nuint)RuntimeInteropData.GetStructUnsafeStructSize(structureTypeHandle);
Buffer.Memmove(ref structure.GetRawData(), ref *(byte *)ptr, size);
}
}
internal static int SizeOfHelper(Type t, bool throwIfNotMarshalable)
{
Debug.Assert(throwIfNotMarshalable);
return(RuntimeInteropData.GetStructUnsafeStructSize(t.TypeHandle));
}