private void EmitPInvokeCall(PInvokeILCodeStreams ilCodeStreams) { ILEmitter emitter = ilCodeStreams.Emitter; ILCodeStream fnptrLoadStream = ilCodeStreams.FunctionPointerLoadStream; ILCodeStream callsiteSetupCodeStream = ilCodeStreams.CallsiteSetupCodeStream; TypeSystemContext context = _targetMethod.Context; bool isHRSwappedRetVal = !_flags.PreserveSig && !_targetMethod.Signature.ReturnType.IsVoid; TypeDesc nativeReturnType = _flags.PreserveSig ? _marshallers[0].NativeParameterType : context.GetWellKnownType(WellKnownType.Int32); TypeDesc[] nativeParameterTypes = new TypeDesc[isHRSwappedRetVal ? _marshallers.Length : _marshallers.Length - 1]; // if the SetLastError flag is set in DllImport, clear the error code before doing P/Invoke if (_flags.SetLastError) { callsiteSetupCodeStream.Emit(ILOpcode.call, emitter.NewToken( InteropTypes.GetPInvokeMarshal(context).GetKnownMethod("ClearLastError", null))); } for (int i = 1; i < _marshallers.Length; i++) { nativeParameterTypes[i - 1] = _marshallers[i].NativeParameterType; } if (isHRSwappedRetVal) { nativeParameterTypes[_marshallers.Length - 1] = _marshallers[0].NativeParameterType; } if (!_pInvokeILEmitterConfiguration.GenerateDirectCall(_targetMethod, out _)) { MetadataType lazyHelperType = context.GetHelperType("InteropHelpers"); FieldDesc lazyDispatchCell = _interopStateManager.GetPInvokeLazyFixupField(_targetMethod); fnptrLoadStream.Emit(ILOpcode.ldsflda, emitter.NewToken(lazyDispatchCell)); fnptrLoadStream.Emit(ILOpcode.call, emitter.NewToken(lazyHelperType .GetKnownMethod("ResolvePInvoke", null))); MethodSignatureFlags unmanagedCallingConvention = _flags.UnmanagedCallingConvention; if (unmanagedCallingConvention == MethodSignatureFlags.None) { unmanagedCallingConvention = MethodSignatureFlags.UnmanagedCallingConvention; } EmbeddedSignatureData[] embeddedSignatureData = null; if (_targetMethod.HasCustomAttribute("System.Runtime.InteropServices", "SuppressGCTransitionAttribute")) { embeddedSignatureData = new EmbeddedSignatureData[] { new EmbeddedSignatureData() { index = MethodSignature.IndexOfCustomModifiersOnReturnType, kind = EmbeddedSignatureDataKind.OptionalCustomModifier, type = context.SystemModule.GetKnownType("System.Runtime.CompilerServices", "CallConvSuppressGCTransition") } }; } MethodSignature nativeSig = new MethodSignature( _targetMethod.Signature.Flags | unmanagedCallingConvention, 0, nativeReturnType, nativeParameterTypes, embeddedSignatureData); ILLocalVariable vNativeFunctionPointer = emitter.NewLocal(context .GetWellKnownType(WellKnownType.IntPtr)); fnptrLoadStream.EmitStLoc(vNativeFunctionPointer); callsiteSetupCodeStream.EmitLdLoc(vNativeFunctionPointer); callsiteSetupCodeStream.Emit(ILOpcode.calli, emitter.NewToken(nativeSig)); } else { // Eager call MethodSignature nativeSig = new MethodSignature( _targetMethod.Signature.Flags, 0, nativeReturnType, nativeParameterTypes); MethodDesc nativeMethod = new PInvokeTargetNativeMethod(_targetMethod, nativeSig); callsiteSetupCodeStream.Emit(ILOpcode.call, emitter.NewToken(nativeMethod)); } if (!_flags.PreserveSig) { callsiteSetupCodeStream.Emit(ILOpcode.call, emitter.NewToken( InteropTypes.GetMarshal(context) .GetKnownMethod("ThrowExceptionForHR", null))); } // if the SetLastError flag is set in DllImport, call the PInvokeMarshal.SaveLastError // so that last error can be used later by calling Marshal.GetLastPInvokeError if (_flags.SetLastError) { callsiteSetupCodeStream.Emit(ILOpcode.call, emitter.NewToken( InteropTypes.GetPInvokeMarshal(context) .GetKnownMethod("SaveLastError", null))); } }
private void EmitPInvokeCall(PInvokeILCodeStreams ilCodeStreams) { ILEmitter emitter = ilCodeStreams.Emitter; ILCodeStream fnptrLoadStream = ilCodeStreams.FunctionPointerLoadStream; ILCodeStream callsiteSetupCodeStream = ilCodeStreams.CallsiteSetupCodeStream; TypeSystemContext context = _targetMethod.Context; bool isHRSwappedRetVal = !_flags.PreserveSig && !_targetMethod.Signature.ReturnType.IsVoid; TypeDesc nativeReturnType = _flags.PreserveSig ? _marshallers[0].NativeParameterType : context.GetWellKnownType(WellKnownType.Int32); TypeDesc[] nativeParameterTypes = new TypeDesc[isHRSwappedRetVal ? _marshallers.Length : _marshallers.Length - 1]; bool runtimeMarshallingEnabled = MarshalHelpers.IsRuntimeMarshallingEnabled(((MetadataType)_targetMethod.OwningType).Module); // if the SetLastError flag is set in DllImport, clear the error code before doing P/Invoke if (_flags.SetLastError) { if (!runtimeMarshallingEnabled) { // When runtime marshalling is disabled, we don't support SetLastError throw new NotSupportedException(); } callsiteSetupCodeStream.Emit(ILOpcode.call, emitter.NewToken( InteropTypes.GetPInvokeMarshal(context).GetKnownMethod("ClearLastError", null))); } for (int i = 1; i < _marshallers.Length; i++) { nativeParameterTypes[i - 1] = _marshallers[i].NativeParameterType; } if (isHRSwappedRetVal) { if (!runtimeMarshallingEnabled) { // When runtime marshalling is disabled, we don't support HResult-return-swapping throw new NotSupportedException(); } nativeParameterTypes[_marshallers.Length - 1] = _marshallers[0].NativeParameterType; } if (!_pInvokeILEmitterConfiguration.GenerateDirectCall(_targetMethod, out _)) { MetadataType lazyHelperType = context.GetHelperType("InteropHelpers"); FieldDesc lazyDispatchCell = _interopStateManager.GetPInvokeLazyFixupField(_targetMethod); fnptrLoadStream.Emit(ILOpcode.ldsflda, emitter.NewToken(lazyDispatchCell)); fnptrLoadStream.Emit(ILOpcode.call, emitter.NewToken(lazyHelperType .GetKnownMethod("ResolvePInvoke", null))); MethodSignature nativeSig = new MethodSignature( MethodSignatureFlags.Static | MethodSignatureFlags.UnmanagedCallingConvention, 0, nativeReturnType, nativeParameterTypes, _targetMethod.GetPInvokeMethodCallingConventions().EncodeAsEmbeddedSignatureData(context)); ILLocalVariable vNativeFunctionPointer = emitter.NewLocal(context .GetWellKnownType(WellKnownType.IntPtr)); fnptrLoadStream.EmitStLoc(vNativeFunctionPointer); callsiteSetupCodeStream.EmitLdLoc(vNativeFunctionPointer); callsiteSetupCodeStream.Emit(ILOpcode.calli, emitter.NewToken(nativeSig)); } else { // Eager call MethodSignature nativeSig = new MethodSignature( _targetMethod.Signature.Flags, 0, nativeReturnType, nativeParameterTypes); MethodDesc nativeMethod = new PInvokeTargetNativeMethod(_targetMethod, nativeSig); callsiteSetupCodeStream.Emit(ILOpcode.call, emitter.NewToken(nativeMethod)); } if (!_flags.PreserveSig) { callsiteSetupCodeStream.Emit(ILOpcode.call, emitter.NewToken( InteropTypes.GetMarshal(context) .GetKnownMethod("ThrowExceptionForHR", null))); } // if the SetLastError flag is set in DllImport, call the PInvokeMarshal.SaveLastError // so that last error can be used later by calling Marshal.GetLastPInvokeError if (_flags.SetLastError) { callsiteSetupCodeStream.Emit(ILOpcode.call, emitter.NewToken( InteropTypes.GetPInvokeMarshal(context) .GetKnownMethod("SaveLastError", null))); } }