altos/lisp: re-use small frames

This saves a pile more use of the allocator by noting when frames have
not been referenced from another frame and freeing them when they go
out of scope. Frames with references are left to the allocator to deal
with.

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

1 files changed, 3 insertions, 3 deletions

diff --git a/src/lisp/ao_lisp_error.c b/src/lisp/ao_lisp_error.c
index cfa78d22..2b15c418 100644
--- a/src/lisp/ao_lisp_error.c
+++ b/src/lisp/ao_lisp_error.c
@@ -49,7 +49,7 @@ ao_lisp_error_frame(int indent, char *name, struct ao_lisp_frame *frame)
 	tabs(indent);
 	printf ("%s{", name);
 	if (frame) {
-		for (f = 0; f < frame->num; f++) {
+		for (f = 0; f < ao_lisp_frame_num(frame); f++) {
 			if (f != 0) {
 				tabs(indent);
 				printf("         ");
@@ -59,8 +59,8 @@ ao_lisp_error_frame(int indent, char *name, struct ao_lisp_frame *frame)
 			ao_lisp_poly_print(frame->vals[f].val);
 			printf("\n");
 		}
-		if (frame->next)
-			ao_lisp_error_frame(indent + 1, "next:   ", ao_lisp_poly_frame(frame->next));
+		if (frame->prev)
+			ao_lisp_error_frame(indent + 1, "prev:   ", ao_lisp_poly_frame(frame->prev));
 	}
 	tabs(indent);
 	printf("        }\n");