X-Git-Url: https://git.gag.com/?a=blobdiff_plain;f=src%2Flisp%2Fao_lisp.h;h=fa3632b157afaeb8c38c8c7a9c7810efe5395434;hb=129e07ccc9b8a33491a905a91ca6c5b0509aba9c;hp=98e99acbaec768d4467521f946f19f9741a0be3e;hpb=11cb03b1d336ee90c422be27588f57be573a9546;p=fw%2Faltos

diff --git a/src/lisp/ao_lisp.h b/src/lisp/ao_lisp.h
index 98e99acb..fa3632b1 100644
--- a/src/lisp/ao_lisp.h
+++ b/src/lisp/ao_lisp.h
@@ -15,29 +15,76 @@
 #ifndef _AO_LISP_H_
 #define _AO_LISP_H_
 
-#include <stdlib.h>
-
-#if !defined(AO_LISP_TEST) && !defined(AO_LISP_MAKE_CONST)
-#include <ao.h>
-#define AO_LISP_ALTOS	1
-#define abort() ao_panic(1)
-#endif
+#define DBG_MEM		0
+#define DBG_EVAL	0
 
 #include <stdint.h>
 #include <string.h>
-#include <stdio.h>
+#include <ao_lisp_os.h>
+
+typedef uint16_t	ao_poly;
+typedef int16_t		ao_signed_poly;
+
+#ifdef AO_LISP_SAVE
+
+struct ao_lisp_os_save {
+	ao_poly		atoms;
+	ao_poly		globals;
+	uint16_t	const_checksum;
+	uint16_t	const_checksum_inv;
+};
+
+#define AO_LISP_POOL_EXTRA	(sizeof(struct ao_lisp_os_save))
+#define AO_LISP_POOL	((int) (AO_LISP_POOL_TOTAL - AO_LISP_POOL_EXTRA))
+
+int
+ao_lisp_os_save(void);
+
+int
+ao_lisp_os_restore_save(struct ao_lisp_os_save *save, int offset);
+
+int
+ao_lisp_os_restore(void);
+
+#endif
 
 #ifdef AO_LISP_MAKE_CONST
 #define AO_LISP_POOL_CONST	16384
 extern uint8_t ao_lisp_const[AO_LISP_POOL_CONST];
 #define ao_lisp_pool ao_lisp_const
 #define AO_LISP_POOL AO_LISP_POOL_CONST
-#define _ao_lisp_atom_quote ao_lisp_atom_poly(ao_lisp_atom_intern("quote"))
-#define _ao_lisp_atom_set ao_lisp_atom_poly(ao_lisp_atom_intern("set"))
+
+#define _atom(n) ao_lisp_atom_poly(ao_lisp_atom_intern(n))
+
+#define _ao_lisp_atom_quote	_atom("quote")
+#define _ao_lisp_atom_set 	_atom("set")
+#define _ao_lisp_atom_setq 	_atom("setq")
+#define _ao_lisp_atom_t 	_atom("t")
+#define _ao_lisp_atom_car 	_atom("car")
+#define _ao_lisp_atom_cdr	_atom("cdr")
+#define _ao_lisp_atom_cons	_atom("cons")
+#define _ao_lisp_atom_last	_atom("last")
+#define _ao_lisp_atom_length	_atom("length")
+#define _ao_lisp_atom_cond	_atom("cond")
+#define _ao_lisp_atom_lambda	_atom("lambda")
+#define _ao_lisp_atom_led	_atom("led")
+#define _ao_lisp_atom_delay	_atom("delay")
+#define _ao_lisp_atom_pack	_atom("pack")
+#define _ao_lisp_atom_unpack	_atom("unpack")
+#define _ao_lisp_atom_flush	_atom("flush")
+#define _ao_lisp_atom_eval	_atom("eval")
+#define _ao_lisp_atom_read	_atom("read")
+#define _ao_lisp_atom_eof	_atom("eof")
+#define _ao_lisp_atom_save	_atom("save")
+#define _ao_lisp_atom_restore	_atom("restore")
+#define _ao_lisp_atom_call2fcc	_atom("call/cc")
+#define _ao_lisp_atom_collect	_atom("collect")
 #else
 #include "ao_lisp_const.h"
-#define AO_LISP_POOL	1024
-extern uint8_t		ao_lisp_pool[AO_LISP_POOL];
+#ifndef AO_LISP_POOL
+#define AO_LISP_POOL	3072
+#endif
+extern uint8_t		ao_lisp_pool[AO_LISP_POOL + AO_LISP_POOL_EXTRA];
 #endif
 
 /* Primitive types */
@@ -55,7 +102,12 @@ extern uint8_t		ao_lisp_pool[AO_LISP_POOL];
 #define AO_LISP_ATOM		4
 #define AO_LISP_BUILTIN		5
 #define AO_LISP_FRAME		6
-#define AO_LISP_NUM_TYPE	7
+#define AO_LISP_LAMBDA		7
+#define AO_LISP_STACK		8
+#define AO_LISP_NUM_TYPE	9
+
+/* Leave two bits for types to use as they please */
+#define AO_LISP_OTHER_TYPE_MASK	0x3f
 
 #define AO_LISP_NIL	0
 
@@ -64,45 +116,31 @@ extern uint16_t		ao_lisp_top;
 #define AO_LISP_OOM		0x01
 #define AO_LISP_DIVIDE_BY_ZERO	0x02
 #define AO_LISP_INVALID		0x04
+#define AO_LISP_UNDEFINED	0x08
+#define AO_LISP_EOF		0x10
 
 extern uint8_t		ao_lisp_exception;
 
-typedef uint16_t	ao_poly;
-
 static inline int
 ao_lisp_is_const(ao_poly poly) {
 	return poly & AO_LISP_CONST;
 }
 
-#define AO_LISP_POOL_BASE	(ao_lisp_pool - 4)
-#define AO_LISP_CONST_BASE	(ao_lisp_const - 4)
-
 #define AO_LISP_IS_CONST(a)	(ao_lisp_const <= ((uint8_t *) (a)) && ((uint8_t *) (a)) < ao_lisp_const + AO_LISP_POOL_CONST)
 #define AO_LISP_IS_POOL(a)	(ao_lisp_pool <= ((uint8_t *) (a)) && ((uint8_t *) (a)) < ao_lisp_pool + AO_LISP_POOL)
+#define AO_LISP_IS_INT(p)	(ao_lisp_base_type(p) == AO_LISP_INT);
 
-static inline void *
-ao_lisp_ref(ao_poly poly) {
-	if (poly == AO_LISP_NIL)
-		return NULL;
-	if (poly & AO_LISP_CONST)
-		return (void *) (AO_LISP_CONST_BASE + (poly & AO_LISP_REF_MASK));
-	return (void *) (AO_LISP_POOL_BASE + (poly & AO_LISP_REF_MASK));
-}
+void *
+ao_lisp_ref(ao_poly poly);
 
-static inline ao_poly
-ao_lisp_poly(const void *addr, ao_poly type) {
-	const uint8_t	*a = addr;
-	if (a == NULL)
-		return AO_LISP_NIL;
-	if (AO_LISP_IS_CONST(a))
-		return AO_LISP_CONST | (a - AO_LISP_CONST_BASE) | type;
-	return (a - AO_LISP_POOL_BASE) | type;
-}
+ao_poly
+ao_lisp_poly(const void *addr, ao_poly type);
 
 struct ao_lisp_type {
-	void	(*mark)(void *addr);
 	int	(*size)(void *addr);
+	void	(*mark)(void *addr);
 	void	(*move)(void *addr);
+	char	name[];
 };
 
 struct ao_lisp_cons {
@@ -123,12 +161,20 @@ struct ao_lisp_val {
 };
 
 struct ao_lisp_frame {
+	uint8_t			type;
 	uint8_t			num;
-	uint8_t			readonly;
-	ao_poly			next;
+	ao_poly			prev;
 	struct ao_lisp_val	vals[];
 };
 
+/* Set on type when the frame escapes the lambda */
+#define AO_LISP_FRAME_MARK	0x80
+#define AO_LISP_FRAME_PRINT	0x40
+
+static inline int ao_lisp_frame_marked(struct ao_lisp_frame *f) {
+	return f->type & AO_LISP_FRAME_MARK;
+}
+
 static inline struct ao_lisp_frame *
 ao_lisp_poly_frame(ao_poly poly) {
 	return ao_lisp_ref(poly);
@@ -139,10 +185,67 @@ ao_lisp_frame_poly(struct ao_lisp_frame *frame) {
 	return ao_lisp_poly(frame, AO_LISP_OTHER);
 }
 
-#define AO_LISP_LAMBDA	0
-#define AO_LISP_NLAMBDA	1
-#define AO_LISP_MACRO	2
-#define AO_LISP_LEXPR	3
+enum eval_state {
+	eval_sexpr,		/* Evaluate an sexpr */
+	eval_val,		/* Value computed */
+	eval_formal,		/* Formal computed */
+	eval_exec,		/* Start a lambda evaluation */
+	eval_cond,		/* Start next cond clause */
+	eval_cond_test,		/* Check cond condition */
+	eval_progn,		/* Start next progn entry */
+	eval_while,		/* Start while condition */
+	eval_while_test,	/* Check while condition */
+	eval_macro,		/* Finished with macro generation */
+};
+
+struct ao_lisp_stack {
+	uint8_t			type;		/* AO_LISP_STACK */
+	uint8_t			state;		/* enum eval_state */
+	ao_poly			prev;		/* previous stack frame */
+	ao_poly			sexprs;		/* expressions to evaluate */
+	ao_poly			values;		/* values computed */
+	ao_poly			values_tail;	/* end of the values list for easy appending */
+	ao_poly			frame;		/* current lookup frame */
+	ao_poly			list;		/* most recent function call */
+};
+
+#define AO_LISP_STACK_MARK	0x80	/* set on type when a reference has been taken */
+#define AO_LISP_STACK_PRINT	0x40	/* stack is being printed */
+
+static inline int ao_lisp_stack_marked(struct ao_lisp_stack *s) {
+	return s->type & AO_LISP_STACK_MARK;
+}
+
+static inline void ao_lisp_stack_mark(struct ao_lisp_stack *s) {
+	s->type |= AO_LISP_STACK_MARK;
+}
+
+static inline struct ao_lisp_stack *
+ao_lisp_poly_stack(ao_poly p)
+{
+	return ao_lisp_ref(p);
+}
+
+static inline ao_poly
+ao_lisp_stack_poly(struct ao_lisp_stack *stack)
+{
+	return ao_lisp_poly(stack, AO_LISP_OTHER);
+}
+
+extern ao_poly			ao_lisp_v;
+
+#define AO_LISP_FUNC_LAMBDA	0
+#define AO_LISP_FUNC_NLAMBDA	1
+#define AO_LISP_FUNC_MACRO	2
+#define AO_LISP_FUNC_LEXPR	3
+
+#define AO_LISP_FUNC_FREE_ARGS	0x80
+#define AO_LISP_FUNC_MASK	0x7f
+
+#define AO_LISP_FUNC_F_LAMBDA	(AO_LISP_FUNC_FREE_ARGS | AO_LISP_FUNC_LAMBDA)
+#define AO_LISP_FUNC_F_NLAMBDA	(AO_LISP_FUNC_FREE_ARGS | AO_LISP_FUNC_NLAMBDA)
+#define AO_LISP_FUNC_F_MACRO	(AO_LISP_FUNC_FREE_ARGS | AO_LISP_FUNC_MACRO)
+#define AO_LISP_FUNC_F_LEXPR	(AO_LISP_FUNC_FREE_ARGS | AO_LISP_FUNC_LEXPR)
 
 struct ao_lisp_builtin {
 	uint8_t		type;
@@ -151,24 +254,50 @@ struct ao_lisp_builtin {
 };
 
 enum ao_lisp_builtin_id {
+	builtin_eval,
+	builtin_read,
+	builtin_lambda,
+	builtin_lexpr,
+	builtin_nlambda,
+	builtin_macro,
 	builtin_car,
 	builtin_cdr,
 	builtin_cons,
+	builtin_last,
+	builtin_length,
 	builtin_quote,
 	builtin_set,
 	builtin_setq,
+	builtin_cond,
+	builtin_progn,
+	builtin_while,
 	builtin_print,
+	builtin_patom,
 	builtin_plus,
 	builtin_minus,
 	builtin_times,
 	builtin_divide,
 	builtin_mod,
-	builtin_last
+	builtin_equal,
+	builtin_less,
+	builtin_greater,
+	builtin_less_equal,
+	builtin_greater_equal,
+	builtin_pack,
+	builtin_unpack,
+	builtin_flush,
+	builtin_delay,
+	builtin_led,
+	builtin_save,
+	builtin_restore,
+	builtin_call_cc,
+	builtin_collect,
+	_builtin_last
 };
 
 typedef ao_poly (*ao_lisp_func_t)(struct ao_lisp_cons *cons);
 
-extern ao_lisp_func_t	ao_lisp_builtins[];
+extern const ao_lisp_func_t	ao_lisp_builtins[];
 
 static inline ao_lisp_func_t
 ao_lisp_func(struct ao_lisp_builtin *b)
@@ -176,6 +305,25 @@ ao_lisp_func(struct ao_lisp_builtin *b)
 	return ao_lisp_builtins[b->func];
 }
 
+struct ao_lisp_lambda {
+	uint8_t		type;
+	uint8_t		args;
+	ao_poly		code;
+	ao_poly		frame;
+};
+
+static inline struct ao_lisp_lambda *
+ao_lisp_poly_lambda(ao_poly poly)
+{
+	return ao_lisp_ref(poly);
+}
+
+static inline ao_poly
+ao_lisp_lambda_poly(struct ao_lisp_lambda *lambda)
+{
+	return ao_lisp_poly(lambda, AO_LISP_OTHER);
+}
+
 static inline void *
 ao_lisp_poly_other(ao_poly poly) {
 	return ao_lisp_ref(poly);
@@ -183,7 +331,11 @@ ao_lisp_poly_other(ao_poly poly) {
 
 static inline uint8_t
 ao_lisp_other_type(void *other) {
-	return *((uint8_t *) other);
+#if DBG_MEM
+	if ((*((uint8_t *) other) & AO_LISP_OTHER_TYPE_MASK) >= AO_LISP_NUM_TYPE)
+		ao_lisp_abort();
+#endif
+	return *((uint8_t *) other) & AO_LISP_OTHER_TYPE_MASK;
 }
 
 static inline ao_poly
@@ -193,13 +345,23 @@ ao_lisp_other_poly(const void *other)
 }
 
 static inline int
-ao_lisp_mem_round(int size)
+ao_lisp_size_round(int size)
 {
 	return (size + 3) & ~3;
 }
 
+static inline int
+ao_lisp_size(const struct ao_lisp_type *type, void *addr)
+{
+	return ao_lisp_size_round(type->size(addr));
+}
+
 #define AO_LISP_OTHER_POLY(other) ((ao_poly)(other) + AO_LISP_OTHER)
 
+static inline int ao_lisp_poly_base_type(ao_poly poly) {
+	return poly & AO_LISP_TYPE_MASK;
+}
+
 static inline int ao_lisp_poly_type(ao_poly poly) {
 	int	type = poly & AO_LISP_TYPE_MASK;
 	if (type == AO_LISP_OTHER)
@@ -222,13 +384,13 @@ ao_lisp_cons_poly(struct ao_lisp_cons *cons)
 static inline int
 ao_lisp_poly_int(ao_poly poly)
 {
-	return (int) poly >> AO_LISP_TYPE_SHIFT;
+	return (int) ((ao_signed_poly) poly >> AO_LISP_TYPE_SHIFT);
 }
 
 static inline ao_poly
 ao_lisp_int_poly(int i)
 {
-	return ((ao_poly) i << 2) + AO_LISP_INT;
+	return ((ao_poly) i << 2) | AO_LISP_INT;
 }
 
 static inline char *
@@ -268,34 +430,66 @@ ao_lisp_builtin_poly(struct ao_lisp_builtin *b)
 }
 
 /* memory functions */
-void
+
+extern int ao_lisp_collects[2];
+extern int ao_lisp_freed[2];
+extern int ao_lisp_loops[2];
+
+/* returns 1 if the object was already marked */
+int
 ao_lisp_mark(const struct ao_lisp_type *type, void *addr);
 
 /* returns 1 if the object was already marked */
 int
-ao_lisp_mark_memory(void *addr, int size);
+ao_lisp_mark_memory(const struct ao_lisp_type *type, void *addr);
 
 void *
 ao_lisp_move_map(void *addr);
 
-void *
-ao_lisp_move(const struct ao_lisp_type *type, void *addr);
+/* returns 1 if the object was already moved */
+int
+ao_lisp_move(const struct ao_lisp_type *type, void **ref);
 
-/* returns NULL if the object was already moved */
-void *
-ao_lisp_move_memory(void *addr, int size);
+/* returns 1 if the object was already moved */
+int
+ao_lisp_move_memory(const struct ao_lisp_type *type, void **ref);
 
 void *
 ao_lisp_alloc(int size);
 
-void
-ao_lisp_collect(void);
+#define AO_LISP_COLLECT_FULL		1
+#define AO_LISP_COLLECT_INCREMENTAL	0
 
 int
-ao_lisp_root_add(const struct ao_lisp_type *type, void *addr);
+ao_lisp_collect(uint8_t style);
 
 void
-ao_lisp_root_clear(void *addr);
+ao_lisp_cons_stash(int id, struct ao_lisp_cons *cons);
+
+struct ao_lisp_cons *
+ao_lisp_cons_fetch(int id);
+
+void
+ao_lisp_poly_stash(int id, ao_poly poly);
+
+ao_poly
+ao_lisp_poly_fetch(int id);
+
+void
+ao_lisp_string_stash(int id, char *string);
+
+char *
+ao_lisp_string_fetch(int id);
+
+static inline void
+ao_lisp_stack_stash(int id, struct ao_lisp_stack *stack) {
+	ao_lisp_poly_stash(id, ao_lisp_stack_poly(stack));
+}
+
+static inline struct ao_lisp_stack *
+ao_lisp_stack_fetch(int id) {
+	return ao_lisp_poly_stack(ao_lisp_poly_fetch(id));
+}
 
 /* cons */
 extern const struct ao_lisp_type ao_lisp_cons_type;
@@ -303,31 +497,47 @@ extern const struct ao_lisp_type ao_lisp_cons_type;
 struct ao_lisp_cons *
 ao_lisp_cons_cons(ao_poly car, struct ao_lisp_cons *cdr);
 
+extern struct ao_lisp_cons *ao_lisp_cons_free_list;
+
+void
+ao_lisp_cons_free(struct ao_lisp_cons *cons);
+
 void
 ao_lisp_cons_print(ao_poly);
 
+void
+ao_lisp_cons_patom(ao_poly);
+
+int
+ao_lisp_cons_length(struct ao_lisp_cons *cons);
+
 /* string */
 extern const struct ao_lisp_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);
 
+ao_poly
+ao_lisp_string_pack(struct ao_lisp_cons *cons);
+
+ao_poly
+ao_lisp_string_unpack(char *a);
+
 void
 ao_lisp_string_print(ao_poly s);
 
+void
+ao_lisp_string_patom(ao_poly s);
+
 /* atom */
 extern const struct ao_lisp_type ao_lisp_atom_type;
 
-extern struct ao_lisp_atom *ao_lisp_atoms;
-
-void
-ao_lisp_atom_init(void);
+extern struct ao_lisp_atom	*ao_lisp_atoms;
+extern struct ao_lisp_frame	*ao_lisp_frame_global;
+extern struct ao_lisp_frame	*ao_lisp_frame_current;
 
 void
 ao_lisp_atom_print(ao_poly a);
@@ -335,6 +545,9 @@ ao_lisp_atom_print(ao_poly a);
 struct ao_lisp_atom *
 ao_lisp_atom_intern(char *name);
 
+ao_poly *
+ao_lisp_atom_ref(struct ao_lisp_frame *frame, ao_poly atom);
+
 ao_poly
 ao_lisp_atom_get(ao_poly atom);
 
@@ -346,26 +559,59 @@ void
 ao_lisp_int_print(ao_poly i);
 
 /* prim */
-ao_poly
+void
 ao_lisp_poly_print(ao_poly p);
 
 void
-ao_lisp_poly_mark(ao_poly p);
+ao_lisp_poly_patom(ao_poly p);
 
-ao_poly
-ao_lisp_poly_move(ao_poly p);
+int
+ao_lisp_poly_mark(ao_poly p, uint8_t note_cons);
+
+/* returns 1 if the object has already been moved */
+int
+ao_lisp_poly_move(ao_poly *p, uint8_t note_cons);
 
 /* eval */
+
+void
+ao_lisp_eval_clear_globals(void);
+
+int
+ao_lisp_eval_restart(void);
+
 ao_poly
 ao_lisp_eval(ao_poly p);
 
+ao_poly
+ao_lisp_set_cond(struct ao_lisp_cons *cons);
+
 /* builtin */
 void
 ao_lisp_builtin_print(ao_poly b);
 
 extern const struct ao_lisp_type ao_lisp_builtin_type;
 
+/* Check argument count */
+ao_poly
+ao_lisp_check_argc(ao_poly name, struct ao_lisp_cons *cons, int min, int max);
+
+/* Check argument type */
+ao_poly
+ao_lisp_check_argt(ao_poly name, struct ao_lisp_cons *cons, int argc, int type, int nil_ok);
+
+/* Fetch an arg (nil if off the end) */
+ao_poly
+ao_lisp_arg(struct ao_lisp_cons *cons, int argc);
+
+char *
+ao_lisp_args_name(uint8_t args);
+
 /* read */
+extern struct ao_lisp_cons	*ao_lisp_read_cons;
+extern struct ao_lisp_cons	*ao_lisp_read_cons_tail;
+extern struct ao_lisp_cons	*ao_lisp_read_stack;
+
 ao_poly
 ao_lisp_read(void);
 
@@ -376,16 +622,168 @@ ao_lisp_read_eval_print(void);
 /* frame */
 extern const struct ao_lisp_type ao_lisp_frame_type;
 
-int
-ao_lisp_frame_set(struct ao_lisp_frame *frame, ao_poly atom, ao_poly val);
+#define AO_LISP_FRAME_FREE	6
+
+extern struct ao_lisp_frame	*ao_lisp_frame_free_list[AO_LISP_FRAME_FREE];
 
 ao_poly
-ao_lisp_frame_get(struct ao_lisp_frame *frame, ao_poly atom);
+ao_lisp_frame_mark(struct ao_lisp_frame *frame);
 
-struct ao_lisp_frame *
-ao_lisp_frame_new(int num, int readonly);
+ao_poly *
+ao_lisp_frame_ref(struct ao_lisp_frame *frame, ao_poly atom);
 
 struct ao_lisp_frame *
-ao_lisp_frame_add(struct ao_lisp_frame *frame, ao_poly atom, ao_poly val);
+ao_lisp_frame_new(int num);
+
+void
+ao_lisp_frame_free(struct ao_lisp_frame *frame);
+
+void
+ao_lisp_frame_bind(struct ao_lisp_frame *frame, int num, ao_poly atom, ao_poly val);
+
+int
+ao_lisp_frame_add(struct ao_lisp_frame **frame, ao_poly atom, ao_poly val);
+
+void
+ao_lisp_frame_print(ao_poly p);
+
+/* lambda */
+extern const struct ao_lisp_type ao_lisp_lambda_type;
+
+extern const char *ao_lisp_state_names[];
+
+struct ao_lisp_lambda *
+ao_lisp_lambda_new(ao_poly cons);
+
+void
+ao_lisp_lambda_print(ao_poly lambda);
+
+ao_poly
+ao_lisp_lambda(struct ao_lisp_cons *cons);
+
+ao_poly
+ao_lisp_lexpr(struct ao_lisp_cons *cons);
+
+ao_poly
+ao_lisp_nlambda(struct ao_lisp_cons *cons);
+
+ao_poly
+ao_lisp_macro(struct ao_lisp_cons *cons);
+
+ao_poly
+ao_lisp_lambda_eval(void);
+
+/* save */
+
+ao_poly
+ao_lisp_save(struct ao_lisp_cons *cons);
+
+ao_poly
+ao_lisp_restore(struct ao_lisp_cons *cons);
+
+/* stack */
+
+extern const struct ao_lisp_type ao_lisp_stack_type;
+extern struct ao_lisp_stack	*ao_lisp_stack;
+extern struct ao_lisp_stack	*ao_lisp_stack_free_list;
+
+void
+ao_lisp_stack_reset(struct ao_lisp_stack *stack);
+
+int
+ao_lisp_stack_push(void);
+
+void
+ao_lisp_stack_pop(void);
+
+void
+ao_lisp_stack_clear(void);
+
+void
+ao_lisp_stack_print(ao_poly stack);
+
+ao_poly
+ao_lisp_stack_eval(void);
+
+ao_poly
+ao_lisp_call_cc(struct ao_lisp_cons *cons);
+
+/* error */
+
+void
+ao_lisp_error_poly(char *name, ao_poly poly, ao_poly last);
+
+void
+ao_lisp_error_frame(int indent, char *name, struct ao_lisp_frame *frame);
+
+ao_poly
+ao_lisp_error(int error, char *format, ...);
+
+/* debugging macros */
+
+#if DBG_EVAL
+#define DBG_CODE	1
+int ao_lisp_stack_depth;
+#define DBG_DO(a)	a
+#define DBG_INDENT()	do { int _s; for(_s = 0; _s < ao_lisp_stack_depth; _s++) printf("  "); } while(0)
+#define DBG_IN()	(++ao_lisp_stack_depth)
+#define DBG_OUT()	(--ao_lisp_stack_depth)
+#define DBG_RESET()	(ao_lisp_stack_depth = 0)
+#define DBG(...) 	printf(__VA_ARGS__)
+#define DBGI(...)	do { DBG("%4d: ", __LINE__); DBG_INDENT(); DBG(__VA_ARGS__); } while (0)
+#define DBG_CONS(a)	ao_lisp_cons_print(ao_lisp_cons_poly(a))
+#define DBG_POLY(a)	ao_lisp_poly_print(a)
+#define OFFSET(a)	((a) ? (int) ((uint8_t *) a - ao_lisp_pool) : -1)
+#define DBG_STACK()	ao_lisp_stack_print(ao_lisp_stack_poly(ao_lisp_stack))
+static inline void
+ao_lisp_frames_dump(void)
+{
+	struct ao_lisp_stack *s;
+	DBGI(".. current frame: "); DBG_POLY(ao_lisp_frame_poly(ao_lisp_frame_current)); DBG("\n");
+	for (s = ao_lisp_stack; s; s = ao_lisp_poly_stack(s->prev)) {
+		DBGI(".. stack frame: "); DBG_POLY(s->frame); DBG("\n");
+	}
+}
+#define DBG_FRAMES()	ao_lisp_frames_dump()
+#else
+#define DBG_DO(a)
+#define DBG_INDENT()
+#define DBG_IN()
+#define DBG_OUT()
+#define DBG(...)
+#define DBGI(...)
+#define DBG_CONS(a)
+#define DBG_POLY(a)
+#define DBG_RESET()
+#define DBG_STACK()
+#define DBG_FRAMES()
+#endif
+
+#define DBG_MEM_START	1
+
+#if DBG_MEM
+
+#include <assert.h>
+extern int dbg_move_depth;
+#define MDBG_DUMP 1
+#define MDBG_OFFSET(a)	((int) ((uint8_t *) (a) - ao_lisp_pool))
+
+extern int dbg_mem;
+
+#define MDBG_DO(a)	a
+#define MDBG_MOVE(...) do { if (dbg_mem) { int d; for (d = 0; d < dbg_move_depth; d++) printf ("  "); printf(__VA_ARGS__); } } while (0)
+#define MDBG_MORE(...) do { if (dbg_mem) printf(__VA_ARGS__); } while (0)
+#define MDBG_MOVE_IN()	(dbg_move_depth++)
+#define MDBG_MOVE_OUT()	(assert(--dbg_move_depth >= 0))
+
+#else
+
+#define MDBG_DO(a)
+#define MDBG_MOVE(...)
+#define MDBG_MORE(...)
+#define MDBG_MOVE_IN()
+#define MDBG_MOVE_OUT()
+
+#endif
 
 #endif /* _AO_LISP_H_ */