public void SetVariableAssigned (VariableInfo variable, bool generatedAssignment = false)
{
variable.SetAssigned (DefiniteAssignment, generatedAssignment);
}
public void SetStructFieldAssigned (VariableInfo variable, string name)
{
variable.SetStructFieldAssigned (DefiniteAssignment, name);
}
public bool IsDefinitelyAssigned (VariableInfo variable)
{
return variable.IsAssigned (DefiniteAssignment);
}
public bool IsStructFieldDefinitelyAssigned (VariableInfo variable, string name)
{
return variable.IsStructFieldAssigned (DefiniteAssignment, name);
}
public static VariableInfo Create (BlockContext bc, Parameter parameter)
{
var info = new VariableInfo (parameter.Name, parameter.Type, bc.AssignmentInfoOffset, bc) {
IsParameter = true
};
bc.AssignmentInfoOffset += info.Length;
return info;
}
public static VariableInfo Create (BlockContext bc, LocalVariable variable)
{
var info = new VariableInfo (variable.Name, variable.Type, bc.AssignmentInfoOffset, bc);
bc.AssignmentInfoOffset += info.Length;
return info;
}
void Initialize ()
{
TypeInfo[] sub_fields = TypeInfo.SubStructInfo;
if (sub_fields != null) {
sub_info = new VariableInfo [sub_fields.Length];
for (int i = 0; i < sub_fields.Length; i++) {
if (sub_fields [i] != null)
sub_info [i] = new VariableInfo (this, sub_fields [i]);
}
} else
sub_info = new VariableInfo [0];
}
VariableInfo (VariableInfo parent, TypeInfo type)
{
this.Name = parent.Name;
this.TypeInfo = type;
this.Offset = parent.Offset + type.Offset;
this.Length = type.TotalLength;
this.IsParameter = parent.IsParameter;
Initialize ();
}
// <summary>
// A struct's constructor must always assign all fields.
// This method checks whether it actually does so.
// </summary>
public bool IsFullyInitialized (FlowAnalysisContext fc, VariableInfo vi, Location loc)
{
if (struct_info == null)
return true;
bool ok = true;
for (int i = 0; i < struct_info.Count; i++) {
var field = struct_info.Fields[i];
if (!fc.IsStructFieldDefinitelyAssigned (vi, field.Name)) {
var bf = field.MemberDefinition as Property.BackingFieldDeclaration;
if (bf != null) {
if (bf.Initializer != null)
continue;
fc.Report.Error (843, loc,
"An automatically implemented property `{0}' must be fully assigned before control leaves the constructor. Consider calling the default struct contructor from a constructor initializer",
field.GetSignatureForError ());
ok = false;
continue;
}
fc.Report.Error (171, loc,
"Field `{0}' must be fully assigned before control leaves the constructor",
field.GetSignatureForError ());
ok = false;
}
}
return ok;
}