private void EmitPInvokeCall(PInvokeILCodeStreams ilCodeStreams) { ILEmitter emitter = ilCodeStreams.Emitter; ILCodeStream callsiteSetupCodeStream = ilCodeStreams.CallsiteSetupCodeStream; TypeSystemContext context = _targetMethod.Context; TypeDesc nativeReturnType = _marshallers[0].NativeParameterType; TypeDesc[] nativeParameterTypes = new TypeDesc[_marshallers.Length - 1]; MetadataType stubHelpersType = InteropTypes.GetStubHelpers(context); // if the SetLastError flag is set in DllImport, clear the error code before doing P/Invoke if (_importMetadata.Flags.SetLastError) { if (!MarshalHelpers.IsRuntimeMarshallingEnabled(((MetadataType)_targetMethod.OwningType).Module)) { // When runtime marshalling is disabled, we don't support generating the stub IL // in Ready-to-Run so we can correctly throw an exception at runtime when the user tries to // use SetLastError=true when marshalling is disabled. throw new NotSupportedException(); } callsiteSetupCodeStream.Emit(ILOpcode.call, emitter.NewToken( stubHelpersType.GetKnownMethod("ClearLastError", null))); } for (int i = 1; i < _marshallers.Length; i++) { nativeParameterTypes[i - 1] = _marshallers[i].NativeParameterType; } MethodSignature nativeSig = new MethodSignature( _targetMethod.Signature.Flags, 0, nativeReturnType, nativeParameterTypes); var rawTargetMethod = new PInvokeTargetNativeMethod(_targetMethod, nativeSig); callsiteSetupCodeStream.Emit(ILOpcode.call, emitter.NewToken(rawTargetMethod)); // 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 (_importMetadata.Flags.SetLastError) { callsiteSetupCodeStream.Emit(ILOpcode.call, emitter.NewToken( stubHelpersType.GetKnownMethod("SetLastError", null))); } }
private void EmitPInvokeCall(PInvokeILCodeStreams ilCodeStreams) { ILEmitter emitter = ilCodeStreams.Emitter; ILCodeStream callsiteSetupCodeStream = ilCodeStreams.CallsiteSetupCodeStream; TypeSystemContext context = _targetMethod.Context; TypeDesc nativeReturnType = _marshallers[0].NativeParameterType; TypeDesc[] nativeParameterTypes = new TypeDesc[_marshallers.Length - 1]; MetadataType stubHelpersType = InteropTypes.GetStubHelpers(context); // if the SetLastError flag is set in DllImport, clear the error code before doing P/Invoke if (_importMetadata.Flags.SetLastError) { callsiteSetupCodeStream.Emit(ILOpcode.call, emitter.NewToken( stubHelpersType.GetKnownMethod("ClearLastError", null))); } for (int i = 1; i < _marshallers.Length; i++) { nativeParameterTypes[i - 1] = _marshallers[i].NativeParameterType; } callsiteSetupCodeStream.Emit(ILOpcode.call, emitter.NewToken( stubHelpersType.GetKnownMethod("GetStubContext", null))); callsiteSetupCodeStream.Emit(ILOpcode.call, emitter.NewToken( stubHelpersType.GetKnownMethod("GetNDirectTarget", null))); MethodSignatureFlags unmanagedCallConv = _importMetadata.Flags.UnmanagedCallingConvention; MethodSignature nativeSig = new MethodSignature( _targetMethod.Signature.Flags | unmanagedCallConv, 0, nativeReturnType, nativeParameterTypes); callsiteSetupCodeStream.Emit(ILOpcode.calli, emitter.NewToken(nativeSig)); // if the SetLastError flag is set in DllImport, call the PInvokeMarshal. // SaveLastWin32Error so that last error can be used later by calling // PInvokeMarshal.GetLastWin32Error if (_importMetadata.Flags.SetLastError) { callsiteSetupCodeStream.Emit(ILOpcode.call, emitter.NewToken( stubHelpersType.GetKnownMethod("SetLastError", null))); } }