Exp transDec(Absyn.TypeDec d) {
// 1st pass - handles the type headers
// Using a local hashtable, check if there are two types
// with the same name in the same (consecutive) batch
// of mutually recursive types. See test38.tig!
Hashtable hash = new Hashtable();
for (Absyn.TypeDec type = d; type != null; type = type.next) {
if (hash.put(type.name, type.name) != null) error(type.pos, "type redeclared");
type.entry = new Types.NAME(type.name);
env.tenv.put(type.name, type.entry);
}
// 2nd pass - handles the type bodies
for (Absyn.TypeDec type = d; type != null; type = type.next) {
Types.NAME name = (Types.NAME) type.entry;
name.bind(transTy(type.ty));
}
// check for illegal cycle in type declarations
for (Absyn.TypeDec type = d; type != null; type = type.next) {
Types.NAME name = (Types.NAME) type.entry;
if (name.isLoop()) error(type.pos, "illegal type cycle");
}
return translate.TypeDec();
}
