find_identifier
sub = find_identifier(ident, ctype->symbol_list, offset);
member = find_identifier(ident, ctype->symbol_list, &offset);
ctype = find_identifier(e->expr_ident, ctype->symbol_list, &offset);
field = find_identifier(expr->ident, ctype->symbol_list, &offset);
struct symbol *find_identifier(struct ident *ident, struct symbol_list *_list, int *offset);
field = find_identifier(expr->ident, type->symbol_list, &offset);
field = find_identifier(expr->ident, type->symbol_list, &offset);