+static void
+ao_lisp_error_cons(char *name, struct ao_lisp_cons *cons)
+{
+ int first = 1;
+ printf("\t\t%s(", name);
+ if (cons) {
+ while (cons) {
+ if (!first)
+ printf("\t\t ");
+ else
+ first = 0;
+ ao_lisp_poly_print(cons->car);
+ printf("\n");
+ cons = ao_lisp_poly_cons(cons->cdr);
+ }
+ printf("\t\t )\n");
+ } else
+ printf(")\n");
+}
+
+static void tabs(int indent)
+{
+ while (indent--)
+ printf("\t");
+}
+
+static void
+ao_lisp_error_frame(int indent, char *name, struct ao_lisp_frame *frame)
+{
+ int f;
+
+ tabs(indent);
+ printf ("%s{", name);
+ if (frame) {
+ for (f = 0; f < ao_lisp_frame_num(frame); f++) {
+ if (f != 0) {
+ tabs(indent);
+ printf(" ");
+ }
+ ao_lisp_poly_print(frame->vals[f].atom);
+ printf(" = ");
+ ao_lisp_poly_print(frame->vals[f].val);
+ printf("\n");
+ }
+ if (frame->prev)
+ ao_lisp_error_frame(indent + 1, "prev: ", ao_lisp_poly_frame(frame->prev));
+ }
+ tabs(indent);
+ printf(" }\n");
+}
+
+static const char *state_names[] = {
+ "sexpr",
+ "val",
+ "formal",
+ "exec",
+ "cond",
+ "cond_test",
+ "progn",
+};
+
+void
+ao_lisp_stack_print(void)
+{
+ struct ao_lisp_stack *s;
+ printf("Value: "); ao_lisp_poly_print(ao_lisp_v); printf("\n");
+ printf("Stack:\n");
+ for (s = ao_lisp_stack; s; s = ao_lisp_poly_stack(s->prev)) {
+ printf("\t[\n");
+ printf("\t\texpr: "); ao_lisp_poly_print(s->list); printf("\n");
+ printf("\t\tstate: %s\n", state_names[s->state]);
+// printf("\t\tmacro: %s\n", s->macro ? "true" : "false");
+ ao_lisp_error_cons ("sexprs: ", ao_lisp_poly_cons(s->sexprs));
+ ao_lisp_error_cons ("values: ", ao_lisp_poly_cons(s->values));
+ ao_lisp_error_frame(2, "frame: ", ao_lisp_poly_frame(s->frame));
+// ao_lisp_error_frame(2, "mframe: ", ao_lisp_poly_frame(s->macro_frame));
+ printf("\t]\n");
+ }
+}
+