+/*
+ * 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_ */