altos/lisp: working on lexical scoping

Not working yet

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

1 files changed, 81 insertions, 0 deletions

diff --git a/src/lisp/ao_lisp_error.c b/src/lisp/ao_lisp_error.c
index ea8111d9..cedc107c 100644
--- a/src/lisp/ao_lisp_error.c
+++ b/src/lisp/ao_lisp_error.c
@@ -15,6 +15,86 @@
 #include "ao_lisp.h"
 #include <stdarg.h>
 
+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 < frame->num; 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->next)
+			ao_lisp_error_frame(indent + 1, "next:   ", ao_lisp_poly_frame(frame->next));
+	}
+	tabs(indent);
+	printf("        }\n");
+}
+
+static const char *state_names[] = {
+	"sexpr",
+	"val",
+	"formal",
+	"exec",
+	"cond",
+	"cond_test",
+};
+
+void
+ao_lisp_stack_print(void)
+{
+	struct ao_lisp_stack *s;
+	printf("Value:  "); ao_lisp_poly_print(ao_lisp_v); printf("\n");
+	ao_lisp_error_frame(0, "Frame:  ", ao_lisp_frame_current);
+	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");
+	}
+}
+
 ao_poly
 ao_lisp_error(int error, char *format, ...)
 {
@@ -25,5 +105,6 @@ ao_lisp_error(int error, char *format, ...)
 	vprintf(format, args);
 	va_end(args);
 	printf("\n");
+	ao_lisp_stack_print();
 	return AO_LISP_NIL;
 }