/// <summary>
/// Does the given type have any instance field that is a struct?
/// </summary>
private static bool HasInstanceStructFields(TypeDefinition type, out List <FieldDefinition> structFields)
{
structFields = null;
if (type.IsEnum) // Class ctor is already created automatically for enums
{
return(false);
}
if (type.Name.StartsWith("<PrivateImplementationDetails>"))
{
return(false);
}
foreach (var field in type.Fields.Where(x => !x.IsStatic && x.IsReachable && StructFields.IsStructField(x)))
{
if (structFields == null)
{
structFields = new List <FieldDefinition>();
}
structFields.Add(field);
}
return(structFields != null);
}
/// <summary>
/// Create a CopyFrom method.
/// </summary>
private static MethodDefinition CreateCopyFromMethod(ReachableContext reachableContext, TypeDefinition type)
{
var typeSystem = type.Module.TypeSystem;
var method = new MethodDefinition(NameConstants.Struct.CopyFromMethodName, MethodAttributes.Public, type);
var sourceParam = new ParameterDefinition(type);
method.Parameters.Add(sourceParam);
method.DeclaringType = type;
var body = new MethodBody(method);
body.InitLocals = true;
method.Body = body;
// Prepare code
var seq = new ILSequence();
seq.Emit(OpCodes.Nop);
// Call base CopyFrom
var baseType = (type.BaseType != null) ? type.BaseType.GetElementType().Resolve() : null;
if ((baseType != null) && baseType.IsValueType && (baseType.FullName != "System.ValueType"))
{
var baseMethod = new MethodReference(NameConstants.Struct.CopyFromMethodName, baseType, baseType)
{
HasThis = true
};
baseMethod.Parameters.Add(new ParameterDefinition(baseType));
seq.Emit(OpCodes.Ldarg, sourceParam);
seq.Emit(OpCodes.Call, baseMethod);
}
// Copy all fields
foreach (var field in type.Fields.Where(x => !x.IsStatic))
{
TypeDefinition fieldTypeDef;
var isStructField = StructFields.IsStructField(field, out fieldTypeDef);
// Prepare for stfld
seq.Emit(OpCodes.Ldarg, body.ThisParameter);
// Load from source
seq.Emit(OpCodes.Ldarg, sourceParam);
seq.Emit(OpCodes.Ldfld, field);
// If struct, create clone
if (isStructField)
{
var cloneMethod = new MethodReference(NameConstants.Struct.CloneMethodName, fieldTypeDef, fieldTypeDef)
{
HasThis = true
};
seq.Emit(OpCodes.Call, cloneMethod);
}
// Save in this
seq.Emit(OpCodes.Stfld, field);
}
// Return this
seq.Emit(OpCodes.Ldarg, body.ThisParameter);
seq.Emit(OpCodes.Ret);
// Append ret sequence
seq.AppendTo(body);
// Update offsets
body.ComputeOffsets();
// Add method
type.Methods.Add(method);
method.SetReachable(reachableContext);
return(method);
}