X-Git-Url: https://git.gag.com/?a=blobdiff_plain;f=src%2Flisp%2Fao_lisp_frame.c;fp=src%2Flisp%2Fao_lisp_frame.c;h=5aa50f6b0661738ccf4fcc9f9b6c849c0f0ff85f;hb=11cb03b1d336ee90c422be27588f57be573a9546;hp=0000000000000000000000000000000000000000;hpb=9e1a787f8828fb7b750ad3310c89a89536ea5286;p=fw%2Faltos

diff --git a/src/lisp/ao_lisp_frame.c b/src/lisp/ao_lisp_frame.c
new file mode 100644
index 00000000..5aa50f6b
--- /dev/null
+++ b/src/lisp/ao_lisp_frame.c
@@ -0,0 +1,191 @@
+/*
+ * 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"
+
+#if 0
+#define DBG(...)	printf(__VA_ARGS__)
+#else
+#define DBG(...)
+#endif
+
+static inline int
+frame_num_size(int num)
+{
+	return sizeof (struct ao_lisp_frame) + num * sizeof (struct ao_lisp_val);
+}
+
+static int
+frame_size(void *addr)
+{
+	struct ao_lisp_frame	*frame = addr;
+	return frame_num_size(frame->num);
+}
+
+#define OFFSET(a)	((uint8_t *) (ao_lisp_ref(a)) - ao_lisp_const)
+
+static void
+frame_mark(void *addr)
+{
+	struct ao_lisp_frame	*frame = addr;
+	int			f;
+
+	for (;;) {
+		if (frame->readonly)
+			break;
+		for (f = 0; f < frame->num; f++) {
+			struct ao_lisp_val	*v = &frame->vals[f];
+
+			ao_lisp_poly_mark(v->atom);
+			ao_lisp_poly_mark(v->val);
+			DBG ("\tframe mark atom %s %d val %d at %d\n", ao_lisp_poly_atom(v->atom)->name, OFFSET(v->atom), OFFSET(v->val), f);
+		}
+		frame = ao_lisp_poly_frame(frame->next);
+		if (!frame)
+			break;
+		if (ao_lisp_mark_memory(frame, frame_size(frame)))
+			break;
+	}
+}
+
+static void
+frame_move(void *addr)
+{
+	struct ao_lisp_frame	*frame = addr;
+	int			f;
+
+	for (;;) {
+		struct ao_lisp_frame	*next;
+		if (frame->readonly)
+			break;
+		for (f = 0; f < frame->num; f++) {
+			struct ao_lisp_val	*v = &frame->vals[f];
+			ao_poly			t;
+
+			t = ao_lisp_poly_move(v->atom);
+			DBG("\t\tatom %s %d -> %d\n", ao_lisp_poly_atom(t)->name, OFFSET(v->atom), OFFSET(t));
+			v->atom = t;
+			t = ao_lisp_poly_move(v->val);
+			DBG("\t\tval %d -> %d\n", OFFSET(v->val), OFFSET(t));
+			v->val = t;
+		}
+		next = ao_lisp_poly_frame(frame->next);
+		if (!next)
+			break;
+		next = ao_lisp_move_memory(next, frame_size(next));
+		frame->next = ao_lisp_frame_poly(next);
+		frame = next;
+	}
+}
+
+const struct ao_lisp_type ao_lisp_frame_type = {
+	.mark = frame_mark,
+	.size = frame_size,
+	.move = frame_move
+};
+
+static ao_poly *
+ao_lisp_frame_ref(struct ao_lisp_frame *frame, ao_poly atom)
+{
+	int f;
+	for (f = 0; f < frame->num; f++)
+		if (frame->vals[f].atom == atom)
+			return &frame->vals[f].val;
+	return NULL;
+}
+
+int
+ao_lisp_frame_set(struct ao_lisp_frame *frame, ao_poly atom, ao_poly val)
+{
+	while (frame) {
+		if (!frame->readonly) {
+			ao_poly *ref = ao_lisp_frame_ref(frame, atom);
+			if (ref) {
+				*ref = val;
+				return 1;
+			}
+		}
+		frame = ao_lisp_poly_frame(frame->next);
+	}
+	return 0;
+}
+
+ao_poly
+ao_lisp_frame_get(struct ao_lisp_frame *frame, ao_poly atom)
+{
+	while (frame) {
+		ao_poly *ref = ao_lisp_frame_ref(frame, atom);
+		if (ref)
+			return *ref;
+		frame = ao_lisp_poly_frame(frame->next);
+	}
+	return AO_LISP_NIL;
+}
+
+struct ao_lisp_frame *
+ao_lisp_frame_new(int num, int readonly)
+{
+	struct ao_lisp_frame *frame = ao_lisp_alloc(frame_num_size(num));
+
+	if (!frame)
+		return NULL;
+	frame->num = num;
+	frame->readonly = readonly;
+	frame->next = AO_LISP_NIL;
+	memset(frame->vals, '\0', num * sizeof (struct ao_lisp_val));
+	return frame;
+}
+
+static struct ao_lisp_frame *
+ao_lisp_frame_realloc(struct ao_lisp_frame *frame, int new_num, int readonly)
+{
+	struct ao_lisp_frame	*new;
+	int			copy;
+
+	if (new_num == frame->num)
+		return frame;
+	new = ao_lisp_frame_new(new_num, readonly);
+	if (!new)
+		return NULL;
+	copy = new_num;
+	if (copy > frame->num)
+		copy = frame->num;
+	memcpy(new->vals, frame->vals, copy * sizeof (struct ao_lisp_val));
+	if (frame)
+		new->next = frame->next;
+	return new;
+}
+
+struct ao_lisp_frame *
+ao_lisp_frame_add(struct ao_lisp_frame *frame, ao_poly atom, ao_poly val)
+{
+	ao_poly *ref = frame ? ao_lisp_frame_ref(frame, atom) : NULL;
+	if (!ref) {
+		int f;
+		if (frame) {
+			f = frame->num;
+			frame = ao_lisp_frame_realloc(frame, f + 1, frame->readonly);
+		} else {
+			f = 0;
+			frame = ao_lisp_frame_new(1, 0);
+		}
+		if (!frame)
+			return NULL;
+		DBG ("add atom %s %d, val %d at %d\n", ao_lisp_poly_atom(atom)->name, OFFSET(atom), OFFSET(val), f);
+		frame->vals[f].atom = atom;
+		ref = &frame->vals[f].val;
+	}
+	*ref = val;
+	return frame;
+}