altos/lisp: Change lisp objects to use ao_poly everywhere. Add const

This makes all lisp objects use 16-bit ints for references so we can
hold more stuff in small amounts of memory. Also adds a separate
constant pool of lisp objects for builtins, initial atoms and constant
lisp code.

Now builds (and runs!) on the nucleo-32 boards.

Signed-off-by: Keith Packard <keithp@keithp.com>

1 files changed, 40 insertions, 0 deletions

diff --git a/src/lisp/ao_lisp_rep.c b/src/lisp/ao_lisp_rep.c
new file mode 100644
index 00000000..d26d270c
--- /dev/null
+++ b/src/lisp/ao_lisp_rep.c
@@ -0,0 +1,40 @@
+/*
+ * Copyright © 2016 Keith Packard <keithp@keithp.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ */
+
+#include "ao_lisp.h"
+
+ao_poly
+ao_lisp_read_eval_print(void)
+{
+	ao_poly	in, out = AO_LISP_NIL;
+	for(;;) {
+		in = ao_lisp_read();
+		if (!in)
+			break;
+		out = ao_lisp_eval(in);
+		if (ao_lisp_exception) {
+			if (ao_lisp_exception & AO_LISP_OOM)
+				printf("out of memory\n");
+			if (ao_lisp_exception & AO_LISP_DIVIDE_BY_ZERO)
+				printf("divide by zero\n");
+			if (ao_lisp_exception & AO_LISP_INVALID)
+				printf("invalid operation\n");
+			ao_lisp_exception = 0;
+		} else {
+			ao_lisp_poly_print(out);
+			putchar ('\n');
+		}
+	}
+	return out;
+}