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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System;
using Internal.IL;
using Internal.IL.Stubs;
using Debug = System.Diagnostics.Debug;
namespace Internal.TypeSystem.Interop
{
public static partial class MarshalHelpers
{
public static bool IsStructMarshallingRequired(TypeDesc typeDesc)
{
if (typeDesc is ByRefType)
{
typeDesc = typeDesc.GetParameterType();
}
typeDesc = typeDesc.UnderlyingType;
// TODO: There are primitive types which require marshalling, such as bool, char.
if (typeDesc.IsPrimitive)
{
return false;
}
MetadataType type = typeDesc as MetadataType;
if (type == null)
{
return false;
}
//
// For struct marshalling it is required to have either Sequential
// or Explicit layout. For Auto layout the P/Invoke marshalling code
// will throw appropriate error message.
//
if (!type.HasLayout())
return false;
if (!type.IsValueType)
return true;
// If it is not blittable we will need struct marshalling
return !MarshalUtils.IsBlittableType(type);
}
internal static TypeDesc GetNativeMethodParameterType(TypeDesc type, MarshalAsDescriptor marshalAs, InteropStateManager interopStateManager, bool isReturn, bool isAnsi)
{
MarshallerKind elementMarshallerKind;
MarshallerKind marshallerKind = MarshalHelpers.GetMarshallerKind(type,
null, /* parameterIndex */
null, /* customModifierData */
marshalAs,
isReturn,
isAnsi,
MarshallerType.Argument,
out elementMarshallerKind);
return GetNativeTypeFromMarshallerKind(type,
marshallerKind,
elementMarshallerKind,
interopStateManager,
marshalAs);
}
internal static TypeDesc GetNativeStructFieldType(TypeDesc type, MarshalAsDescriptor marshalAs, InteropStateManager interopStateManager, bool isAnsi)
{
MarshallerKind elementMarshallerKind;
MarshallerKind marshallerKind = MarshalHelpers.GetMarshallerKind(type,
null, /* parameterIndex */
null, /* customModifierData */
marshalAs,
false, /* isReturn */
isAnsi, /* isAnsi */
MarshallerType.Field,
out elementMarshallerKind);
return GetNativeTypeFromMarshallerKind(type,
marshallerKind,
elementMarshallerKind,
interopStateManager,
marshalAs);
}
internal static InlineArrayCandidate GetInlineArrayCandidate(TypeDesc managedElementType, MarshallerKind elementMarshallerKind, InteropStateManager interopStateManager, MarshalAsDescriptor marshalAs)
{
TypeDesc nativeType = GetNativeTypeFromMarshallerKind(
managedElementType,
elementMarshallerKind,
MarshallerKind.Unknown,
interopStateManager,
null);
var elementNativeType = nativeType as MetadataType;
if (elementNativeType == null)
{
Debug.Assert(nativeType.IsPointer || nativeType.IsFunctionPointer);
// If it is a pointer type we will create InlineArray for IntPtr
elementNativeType = (MetadataType)managedElementType.Context.GetWellKnownType(WellKnownType.IntPtr);
}
Debug.Assert(marshalAs != null && marshalAs.SizeConst.HasValue);
// if SizeConst is not specified, we will default to 1.
// the marshaller will throw appropriate exception
uint size = 1;
if (marshalAs.SizeConst.HasValue)
{
size = marshalAs.SizeConst.Value;
}
return new InlineArrayCandidate(elementNativeType, size);
}
//TODO: https://github.com/dotnet/corert/issues/2675
// This exception messages need to localized
// TODO: Log as warning
public static MethodIL EmitExceptionBody(string message, MethodDesc method)
{
ILEmitter emitter = new ILEmitter();
TypeSystemContext context = method.Context;
MethodSignature ctorSignature = new MethodSignature(0, 0, context.GetWellKnownType(WellKnownType.Void),
new TypeDesc[] { context.GetWellKnownType(WellKnownType.String) });
MethodDesc exceptionCtor = InteropTypes.GetMarshalDirectiveException(context).GetKnownMethod(".ctor", ctorSignature);
ILCodeStream codeStream = emitter.NewCodeStream();
codeStream.Emit(ILOpcode.ldstr, emitter.NewToken(message));
codeStream.Emit(ILOpcode.newobj, emitter.NewToken(exceptionCtor));
codeStream.Emit(ILOpcode.throw_);
return new PInvokeILStubMethodIL((ILStubMethodIL)emitter.Link(method), isStubRequired: true);
}
}
}
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