altos: Add lisp reader

1 files changed, 242 insertions, 0 deletions

diff --git a/src/lisp/ao_lisp.h b/src/lisp/ao_lisp.h
new file mode 100644
index 00000000..6667dcc2
--- /dev/null
+++ b/src/lisp/ao_lisp.h
@@ -0,0 +1,242 @@
+/*
+ * 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.
+ */
+
+#ifndef _AO_LISP_H_
+#define _AO_LISP_H_
+
+#include <stdint.h>
+#include <string.h>
+#include <stdio.h>
+
+
+# define AO_LISP_CONS	0
+# define AO_LISP_INT	1
+# define AO_LISP_STRING	2
+# define AO_LISP_OTHER	3
+
+# define AO_LISP_ATOM		4
+# define AO_LISP_BUILTIN	5
+
+# define AO_LISP_NIL	0
+
+#define AO_LISP_POOL	1024
+#define AO_LISP_ROOT	16
+
+static inline void *ao_lisp_set_ref(void *addr) {
+	return (void *) ((intptr_t)addr | 1);
+}
+
+static inline void *ao_lisp_clear_ref(void *addr) {
+	return (void *) ((intptr_t)addr & ~1);
+}
+
+extern uint8_t	ao_lisp_pool[AO_LISP_POOL];
+
+struct ao_lisp_mem_type {
+	void	(*mark)(void *addr);
+	int	(*size)(void *addr);
+	void	(*move)(void *addr);
+};
+
+typedef intptr_t	ao_lisp_poly;
+
+struct ao_lisp_cons {
+	ao_lisp_poly		car;
+	struct ao_lisp_cons	*cdr;
+};
+
+struct ao_lisp_atom {
+	uint8_t			type;
+	ao_lisp_poly		val;
+	struct ao_lisp_atom	*next;
+	char			name[];
+};
+
+#define AO_LISP_ATOM_CONST	((struct ao_lisp_atom *) (intptr_t) 1)
+
+extern const struct ao_lisp_atom *ao_lisp_builtins[];
+
+struct ao_lisp_builtin {
+	uint8_t			type;
+	ao_lisp_poly		(*func)(struct ao_lisp_cons *cons);
+	char			name[];
+};
+
+static inline void *
+ao_lisp_poly_other(ao_lisp_poly poly) {
+	return (void *) (poly - AO_LISP_OTHER);
+}
+
+static const inline ao_lisp_poly
+ao_lisp_other_poly(const void *other)
+{
+	return (ao_lisp_poly) other + AO_LISP_OTHER;
+}
+
+#define AO_LISP_OTHER_POLY(other) ((ao_lisp_poly)(other) + AO_LISP_OTHER)
+
+static inline int ao_lisp_poly_type(ao_lisp_poly poly) {
+	int	type = poly & 3;
+	if (type == AO_LISP_OTHER)
+		return *((uint8_t *) ao_lisp_poly_other(poly));
+	return type;
+}
+
+static inline struct ao_lisp_cons *
+ao_lisp_poly_cons(ao_lisp_poly poly)
+{
+	return (struct ao_lisp_cons *) (poly - AO_LISP_CONS);
+}
+
+static inline ao_lisp_poly
+ao_lisp_cons_poly(struct ao_lisp_cons *cons)
+{
+	return (ao_lisp_poly) cons + AO_LISP_CONS;
+}
+
+static inline int
+ao_lisp_poly_int(ao_lisp_poly poly)
+{
+	return (int) (poly >> 2);
+}
+
+static inline ao_lisp_poly
+ao_lisp_int_poly(int i)
+{
+	return ((ao_lisp_poly) i << 2) + AO_LISP_INT;
+}
+
+static inline char *
+ao_lisp_poly_string(ao_lisp_poly poly)
+{
+	return (char *) (poly - AO_LISP_STRING);
+}
+
+static inline ao_lisp_poly
+ao_lisp_string_poly(char *s) {
+	return (ao_lisp_poly) s + AO_LISP_STRING;
+}
+
+static inline struct ao_lisp_atom *
+ao_lisp_poly_atom(ao_lisp_poly poly)
+{
+	return (struct ao_lisp_atom *) (poly - AO_LISP_OTHER);
+}
+
+static inline ao_lisp_poly
+ao_lisp_atom_poly(struct ao_lisp_atom *a)
+{
+	return (ao_lisp_poly) a + AO_LISP_OTHER;
+}
+
+static inline struct ao_lisp_builtin *
+ao_lisp_poly_builtin(ao_lisp_poly poly)
+{
+	return (struct ao_lisp_builtin *) (poly - AO_LISP_OTHER);
+}
+
+static inline ao_lisp_poly
+ao_lisp_builtin_poly(struct ao_lisp_builtin *b)
+{
+	return (ao_lisp_poly) b + AO_LISP_OTHER;
+}
+
+/* memory functions */
+
+void
+ao_lisp_mark(const struct ao_lisp_mem_type *type, void *addr);
+
+/* returns 1 if the object was already marked */
+int
+ao_lisp_mark_memory(void *addr, int size);
+
+void *
+ao_lisp_move(const struct ao_lisp_mem_type *type, void *addr);
+
+/* returns NULL if the object was already moved */
+void *
+ao_lisp_move_memory(void *addr, int size);
+
+void *
+ao_lisp_alloc(int size);
+
+int
+ao_lisp_root_add(const struct ao_lisp_mem_type *type, void *addr);
+
+void
+ao_lisp_root_clear(void *addr);
+
+/* cons */
+extern const struct ao_lisp_mem_type ao_lisp_cons_type;
+
+struct ao_lisp_cons *
+ao_lisp_cons(ao_lisp_poly car, struct ao_lisp_cons *cdr);
+
+void
+ao_lisp_cons_print(struct ao_lisp_cons *cons);
+
+/* string */
+extern const struct ao_lisp_mem_type ao_lisp_string_type;
+
+char *
+ao_lisp_string_new(int len);
+
+char *
+ao_lisp_string_copy(char *a);
+
+char *
+ao_lisp_string_cat(char *a, char *b);
+
+void
+ao_lisp_string_print(char *s);
+
+/* atom */
+extern const struct ao_lisp_mem_type ao_lisp_atom_type;
+
+void
+ao_lisp_atom_init(void);
+
+void
+ao_lisp_atom_print(struct ao_lisp_atom *atom);
+
+struct ao_lisp_atom *
+ao_lisp_atom_intern(char *name);
+
+/* int */
+void
+ao_lisp_int_print(int i);
+
+/* prim */
+ao_lisp_poly
+ao_lisp_poly_print(ao_lisp_poly p);
+
+void
+ao_lisp_poly_mark(ao_lisp_poly p);
+
+ao_lisp_poly
+ao_lisp_poly_move(ao_lisp_poly p);
+
+/* eval */
+ao_lisp_poly
+ao_lisp_eval(ao_lisp_poly p);
+
+/* builtin */
+void
+ao_lisp_builtin_print(struct ao_lisp_builtin *b);
+
+/* read */
+ao_lisp_poly
+ao_lisp_read(void);
+
+#endif /* _AO_LISP_H_ */