private FieldInfo ResolveField(Cci.IFieldReference fieldRef)
{
var fieldDef = fieldRef.GetResolvedField(_context);
if (fieldDef != null && IsLocal(fieldRef.GetContainingType(_context)))
{
return _fieldBuilders[fieldDef];
}
FieldInfo result;
if (_fieldRefs.TryGetValue(fieldRef, out result))
{
return result;
}
Type declaringType = ResolveType(fieldRef.GetContainingType(_context));
Cci.ISpecializedFieldReference specializedRef = fieldRef.AsSpecializedFieldReference;
if (specializedRef != null)
{
if (IsLocal(specializedRef.UnspecializedVersion.GetContainingType(_context)))
{
// declaring type is TypeBuilder or TypeBuilderInstantiation since it's defined in the module being built:
FieldBuilder fieldBuilder = _fieldBuilders[(Cci.IFieldDefinition)specializedRef.UnspecializedVersion.AsDefinition(_context)];
result = TypeBuilder.GetField(declaringType, fieldBuilder);
}
else
{
FieldInfo unspecializedDefinition = ResolveField(specializedRef.UnspecializedVersion);
result = new FieldRef(declaringType, fieldRef.Name, unspecializedDefinition.FieldType);
}
}
else
{
GenericContext genericContext;
if (declaringType.IsGenericTypeDefinition)
{
genericContext = new GenericContext(declaringType.GetGenericArguments(), Type.EmptyTypes);
}
else
{
genericContext = default(GenericContext);
}
// TODO: modifiers?
Type fieldType = ResolveType(fieldRef.GetType(_context), genericContext);
result = new FieldRef(declaringType, fieldRef.Name, fieldType);
}
_fieldRefs.Add(fieldRef, result);
return result;
}
private void MakeMethodParameters(MethodBase method, Cci.IMethodReference methodRef, out Type[] methodGenericParameters, out ParameterInfo[] parameters, out ParameterInfo returnParameter)
{
Type declaringType = method.DeclaringType;
if (methodRef.IsGeneric && methodRef.AsGenericMethodInstanceReference == null)
{
// generic definition
methodGenericParameters = MakeGenericParameters((MethodInfo)method, methodRef);
}
else
{
methodGenericParameters = Type.EmptyTypes;
}
Type[] typeGenericParameters;
if (declaringType.IsGenericTypeDefinition)
{
typeGenericParameters = declaringType.GetGenericArguments();
}
else
{
typeGenericParameters = Type.EmptyTypes;
}
GenericContext genericContext = methodGenericParameters.Length > 0 || typeGenericParameters.Length > 0 ?
new GenericContext(typeGenericParameters, methodGenericParameters) : default(GenericContext);
parameters = new ParameterInfo[methodRef.ParameterCount];
int i = 0;
foreach (var parameter in methodRef.GetParameters(_context))
{
parameters[i] = MakeParameterInfo(method, i + 1, parameter.GetType(_context), genericContext, parameter.CustomModifiers, parameter.IsByReference);
i++;
}
returnParameter = MakeParameterInfo(method, 0, methodRef.GetType(_context), genericContext, methodRef.ReturnValueCustomModifiers, methodRef.ReturnValueIsByRef);
}
private Type ResolveParameterType(Cci.IParameterTypeInformation parameter, GenericContext genericContext = default(GenericContext))
{
var parameterType = ResolveType(parameter.GetType(_context), genericContext);
if (parameter.IsByReference)
{
parameterType = parameterType.MakeByRefType();
}
if (parameter.CustomModifiers.Any())
{
Type[] reqMods, optMods;
ResolveCustomModifiers(parameter.CustomModifiers, out reqMods, out optMods);
return new ModifiedType(parameterType, reqMods, optMods);
}
else
{
return parameterType;
}
}
private void DefineParameter(MethodBuilder methodBuilder, ConstructorBuilder constructorBuilder, Cci.IParameterDefinition paramDef)
{
// No explicit param row is needed if param has no flags (other than optionally IN),
// no name and no references to the param row, such as CustomAttribute, Constant, or FieldMarshall
var attributes = paramDef.GetAttributes(_context);
var defaultValue = paramDef.GetDefaultValue(_context);
if (defaultValue != null ||
paramDef.IsOptional ||
paramDef.IsOut ||
paramDef.IsMarshalledExplicitly ||
attributes.Any() ||
paramDef.Name.Length > 0)
{
int index = paramDef is Cci.ReturnValueParameter ? 0 : paramDef.Index + 1;
ParameterAttributes attrs = (ParameterAttributes)Cci.MetadataWriter.GetParameterFlags(paramDef);
ParameterBuilder paramBuilder = (methodBuilder != null) ?
methodBuilder.DefineParameter(index, attrs, paramDef.Name) :
constructorBuilder.DefineParameter(index, attrs, paramDef.Name);
if (defaultValue != null)
{
object rawValue = defaultValue.Value;
if (rawValue == null)
{
var paramTypeRef = paramDef.GetType(_context);
if (paramTypeRef.IsValueType)
{
SetParameterDefaultStructValue(paramBuilder);
}
else
{
paramBuilder.SetConstant(null);
}
}
else
{
// TODO (tomat): Ref.Emit has too strict checks on the constant type. While it is ok to emit value,
// e.g. of type Int16 for parameter of type Int32 to metadata, Ref.Emit checks if these types are Type.IsAssignableFrom.
// To make this work we need to convert.
//
// We also need to support Nullable<T>.
if (rawValue.GetType().IsPrimitive)
{
// parameter type has already been resolved once when defining the method, so just retrive it:
Type paramType = ResolveType(paramDef.GetType(_context));
if (paramType.IsGenericType && paramType.GetGenericTypeDefinition() == typeof(Nullable<>))
{
paramType = paramType.GetGenericArguments()[0];
}
if (paramType.IsEnum)
{
// If emitting the enum, it isn't "created" as this stage so Enum.GetUnderlyingType() will throw
// Otherwise, if the enum is already defined, we should use Enum.GetUnderlyingType() to get the correct type
paramType = paramType is TypeBuilder ? paramType.UnderlyingSystemType : Enum.GetUnderlyingType(paramType);
}
rawValue = Convert.ChangeType(rawValue, paramType, System.Globalization.CultureInfo.InvariantCulture);
}
paramBuilder.SetConstant(rawValue);
}
}
if (paramDef.IsMarshalledExplicitly)
{
// FieldMarshal
var marshallingInformation = paramDef.MarshallingInformation;
if (marshallingInformation != null)
{
paramBuilder.SetCustomAttribute(GetMarshalAsAttribute(marshallingInformation));
}
else
{
Debug.Assert(!paramDef.MarshallingDescriptor.IsDefaultOrEmpty);
// TODO:
throw new NotImplementedException();
}
}
EmitCustomAttributes(paramBuilder, attributes);
}
}
private void GetReturnType(Cci.ISignature signature, out Type returnType, out Type[] reqMods, out Type[] optMods)
{
returnType = ResolveType(signature.GetType(_context));
if (signature.ReturnValueIsByRef)
{
returnType = returnType.MakeByRefType();
}
// TODO (tomat, Dev12): this doesn't handle types constructed from modified types, we need Ref.Emit supporte for that:
if (signature.ReturnValueCustomModifiers.Any())
{
ResolveCustomModifiers(signature.ReturnValueCustomModifiers, out reqMods, out optMods);
}
else
{
reqMods = optMods = null;
}
}
private EventBuilder DefineEvent(TypeBuilder typeBuilder, Cci.IEventDefinition eventDef)
{
EventAttributes attrs = (EventAttributes)Cci.MetadataWriter.GetEventFlags(eventDef);
Type type = ResolveType(eventDef.GetType(_context));
// Event, EventMap
var eventBuilder = typeBuilder.DefineEvent(eventDef.Name, attrs, type);
// MethodSemantics
foreach (var accessor in eventDef.Accessors)
{
var accessorDef = (Cci.IMethodDefinition)accessor.AsDefinition(_context);
var accessorBuilder = _methodBuilders[accessorDef];
if (accessor == eventDef.Adder)
{
eventBuilder.SetAddOnMethod(accessorBuilder);
}
else if (accessor == eventDef.Remover)
{
eventBuilder.SetRemoveOnMethod(accessorBuilder);
}
else if (accessor == eventDef.Caller)
{
eventBuilder.SetRaiseMethod(accessorBuilder);
}
else
{
eventBuilder.AddOtherMethod(accessorBuilder);
}
}
return eventBuilder;
}
private void DefineField(TypeBuilder typeBuilder, Cci.IFieldDefinition fieldDef)
{
FieldAttributes attrs = (FieldAttributes)Cci.MetadataWriter.GetFieldFlags(fieldDef);
FieldBuilder fieldBuilder;
if (!fieldDef.MappedData.IsDefault)
{
// TODO (tomat, Dev12): Unfortunately, Reflection.Emit doesn't allow us to directly set FieldRVA on arbitrary FieldBuilder.
// Instead it creates the mapping types itself and provides APIs to define mapped fields.
// So we use that API and ignore the mapping types provided by the compiler.
// FieldRVA
fieldBuilder = typeBuilder.DefineInitializedData(fieldDef.Name, fieldDef.MappedData.ToArray(), attrs);
}
else
{
// Field types that are value types need to be loaded before the declaring type.
// If the field type is a nested type, e.g. A.B.C only the inner-most type needs to be loaded before the declaring type.
Type type = ResolveType(
fieldDef.GetType(_context),
genericContext: default(GenericContext),
dependentType: typeBuilder,
valueTypeDependency: true);
// TODO (tomat, Dev12): this doesn't handle types constructed from modified types, we need Ref.Emit support for that:
Type[] reqMods = null, optMods = null;
ModifiedType modified = type as ModifiedType;
if (modified != null)
{
reqMods = modified.RequiredModifiers;
optMods = modified.OptionalModifiers;
type = modified.UnmodifiedType;
}
fieldBuilder = typeBuilder.DefineField(fieldDef.Name, type, reqMods, optMods, attrs);
}
// FieldLayout
if (fieldDef.ContainingTypeDefinition.Layout == LayoutKind.Explicit && !fieldDef.IsStatic)
{
fieldBuilder.SetOffset((int)fieldDef.Offset);
}
// FieldMarshal
if (fieldDef.IsMarshalledExplicitly)
{
var marshallingInformation = fieldDef.MarshallingInformation;
if (marshallingInformation != null)
{
fieldBuilder.SetCustomAttribute(GetMarshalAsAttribute(marshallingInformation));
}
else
{
Debug.Assert(!fieldDef.MarshallingDescriptor.IsDefaultOrEmpty);
// TODO:
throw new NotImplementedException();
}
}
_fieldBuilders.Add(fieldDef, fieldBuilder);
}
private bool ReturnTypeMatches(Cci.IMethodReference methodRef, MethodBase method, GenericContext genericContext)
{
MethodInfo methodInfo = method as MethodInfo;
if (methodInfo == null)
{
return true;
}
return methodInfo.ReturnType.IsEquivalentTo(ResolveType(methodRef.GetType(_context), genericContext));
}
private static CCI.TypeNode ResolveCCIType(CCI.AssemblyNode assembly, string ns, string nm)
{
var n = assembly.GetType(CCI.Identifier.For(ns), CCI.Identifier.For(nm));
if (n == null)
throw new InvalidOperationException("unable to load well-known type");
return n;
}