public override AstNode Visit(TypedefDefinition node)
{
// Prevent redefinition.
ScopeMember old = currentContainer.FindMember(node.GetName());
if (old != null)
{
Error(node, "trying to redefine a typedef.");
}
// Create the type name.
TypeNameMember typeName = new TypeNameMember(node.GetFlags(), node.GetName(), currentContainer);
typeName.SetTypedefNode(node);
node.SetTypeName(typeName);
// Register the type name.
if (currentContainer.IsNamespace())
{
Namespace space = (Namespace)currentContainer;
space.AddMember(typeName);
}
else if (currentContainer.IsStructure() || currentContainer.IsClass())
{
Structure parent = (Structure)currentContainer;
parent.AddTypeName(typeName);
}
else
{
Error(node, "unexpected place for a typedef.");
}
return(node);
}
private void ExpandType(TypeNameMember typeName)
{
// Circular references are wrong.
AstNode typedefNode = typeName.GetTypedefNode();
if (typeName.IsExpanding)
{
Error(typedefNode, "typedef with circular reference.");
}
// Ignore expanded types.
IChelaType type = typeName.GetActualType();
if (!type.IsIncompleteType())
{
return;
}
// Set the expanding flag.
typeName.IsExpanding = true;
// Expand the dependencies first.
IncompleteType incomplete = (IncompleteType)type;
foreach (TypeNameMember dep in incomplete.Dependencies)
{
ExpandType(dep);
}
// Expand the type name itself.
ExpandTypeNode((TypedefDefinition)typedefNode, true);
// Unset the expanding flag.
typeName.IsExpanding = false;
}
private void ExpandTypeNode(TypedefDefinition node, bool sorted)
{
// Use the scope in the same place as the definition.
Scope[] expansionScope = null;
if (sorted)
{
expansionScope = node.GetExpansionScope();
foreach (Scope scope in expansionScope)
{
PushScope(scope);
}
}
// Allow unsafe typedefs.
PushUnsafe();
// Get the type name member.
TypeNameMember typeName = node.GetTypeName();
// Parse the type expression.
Expression typeExpr = node.GetTypeExpression();
typeExpr.Accept(this);
// Make sure the type expression is a type.
IChelaType actualType = typeExpr.GetNodeType();
actualType = ExtractActualType(typeExpr, actualType);
// Store the type.
typeName.SetActualType(actualType);
// Store the incomplete typename.
if (actualType.IsIncompleteType())
{
// Don't allow cyclic expansion.
if (sorted)
{
Error(node, "typedef cannot be expanded.");
}
// Store the incomplete type name.
incompletes.Add(typeName);
// Store the typedef scope stack.
int numscopes = scopeStack.Count + 1;
Scope[] scopeData = new Scope[numscopes];
int i = numscopes - 1;
scopeData[i--] = currentScope;
foreach (Scope scope in scopeStack)
{
scopeData[i--] = scope;
}
node.SetExpansionScope(scopeData);
}
// Restore the safe context.
PopUnsafe();
// Restore the scope.
if (sorted)
{
for (int i = 0; i < expansionScope.Length; ++i)
{
PopScope();
}
node.SetExpansionScope(null);
}
}
public void SetTypeName(TypeNameMember typeName)
{
this.typeName = typeName;
}