Merge branch 'master' into branch-1.8

1 files changed, 981 insertions, 0 deletions

diff --git a/src/scheme/ao_scheme.h b/src/scheme/ao_scheme.h
new file mode 100644
index 00000000..2fa1ed60
--- /dev/null
+++ b/src/scheme/ao_scheme.h
@@ -0,0 +1,981 @@
+/*
+ * 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_SCHEME_H_
+#define _AO_SCHEME_H_
+
+#define DBG_MEM		0
+#define DBG_EVAL	0
+#define DBG_READ	0
+#define DBG_FREE_CONS	0
+#define NDEBUG		1
+
+#include <stdint.h>
+#include <string.h>
+#include <ao_scheme_os.h>
+#ifndef __BYTE_ORDER
+#include <endian.h>
+#endif
+
+typedef uint16_t	ao_poly;
+typedef int16_t		ao_signed_poly;
+
+#if AO_SCHEME_SAVE
+
+struct ao_scheme_os_save {
+	ao_poly		atoms;
+	ao_poly		globals;
+	uint16_t	const_checksum;
+	uint16_t	const_checksum_inv;
+};
+
+#define AO_SCHEME_POOL_EXTRA	(sizeof(struct ao_scheme_os_save))
+#define AO_SCHEME_POOL	((int) (AO_SCHEME_POOL_TOTAL - AO_SCHEME_POOL_EXTRA))
+
+int
+ao_scheme_os_save(void);
+
+int
+ao_scheme_os_restore_save(struct ao_scheme_os_save *save, int offset);
+
+int
+ao_scheme_os_restore(void);
+
+#endif
+
+#ifdef AO_SCHEME_MAKE_CONST
+#define AO_SCHEME_POOL_CONST	16384
+extern uint8_t ao_scheme_const[AO_SCHEME_POOL_CONST] __attribute__((aligned(4)));
+#define ao_scheme_pool ao_scheme_const
+#define AO_SCHEME_POOL AO_SCHEME_POOL_CONST
+
+#define _atom(n) ao_scheme_atom_poly(ao_scheme_atom_intern(n))
+#define _bool(v) ao_scheme_bool_poly(ao_scheme_bool_get(v))
+
+#define _ao_scheme_bool_true	_bool(1)
+#define _ao_scheme_bool_false	_bool(0)
+
+#define _ao_scheme_atom_eof	_atom("eof")
+#define _ao_scheme_atom_else	_atom("else")
+
+#define AO_SCHEME_BUILTIN_ATOMS
+#include "ao_scheme_builtin.h"
+
+#else
+#include "ao_scheme_const.h"
+#ifndef AO_SCHEME_POOL
+#define AO_SCHEME_POOL	3072
+#endif
+#ifndef AO_SCHEME_POOL_EXTRA
+#define AO_SCHEME_POOL_EXTRA 0
+#endif
+extern uint8_t		ao_scheme_pool[AO_SCHEME_POOL + AO_SCHEME_POOL_EXTRA] __attribute__((aligned(4)));
+#endif
+
+/* Primitive types */
+#define AO_SCHEME_CONS		0
+#define AO_SCHEME_INT		1
+#define AO_SCHEME_STRING	2
+#define AO_SCHEME_OTHER		3
+
+#define AO_SCHEME_TYPE_MASK	0x0003
+#define AO_SCHEME_TYPE_SHIFT	2
+#define AO_SCHEME_REF_MASK	0x7ffc
+#define AO_SCHEME_CONST		0x8000
+
+/* These have a type value at the start of the struct */
+#define AO_SCHEME_ATOM		4
+#define AO_SCHEME_BUILTIN	5
+#define AO_SCHEME_FRAME		6
+#define AO_SCHEME_FRAME_VALS	7
+#define AO_SCHEME_LAMBDA	8
+#define AO_SCHEME_STACK		9
+#define AO_SCHEME_BOOL		10
+#define AO_SCHEME_BIGINT	11
+#define AO_SCHEME_FLOAT		12
+#define AO_SCHEME_VECTOR	13
+#define AO_SCHEME_NUM_TYPE	14
+
+/* Leave two bits for types to use as they please */
+#define AO_SCHEME_OTHER_TYPE_MASK	0x3f
+
+#define AO_SCHEME_NIL	0
+
+extern uint16_t		ao_scheme_top;
+
+#define AO_SCHEME_OOM			0x01
+#define AO_SCHEME_DIVIDE_BY_ZERO	0x02
+#define AO_SCHEME_INVALID		0x04
+#define AO_SCHEME_UNDEFINED		0x08
+#define AO_SCHEME_REDEFINED		0x10
+#define AO_SCHEME_EOF			0x20
+#define AO_SCHEME_EXIT			0x40
+
+extern uint8_t		ao_scheme_exception;
+
+static inline int
+ao_scheme_is_const(ao_poly poly) {
+	return poly & AO_SCHEME_CONST;
+}
+
+#define AO_SCHEME_IS_CONST(a)	(ao_scheme_const <= ((uint8_t *) (a)) && ((uint8_t *) (a)) < ao_scheme_const + AO_SCHEME_POOL_CONST)
+#define AO_SCHEME_IS_POOL(a)	(ao_scheme_pool <= ((uint8_t *) (a)) && ((uint8_t *) (a)) < ao_scheme_pool + AO_SCHEME_POOL)
+#define AO_SCHEME_IS_INT(p)	(ao_scheme_poly_base_type(p) == AO_SCHEME_INT)
+
+void *
+ao_scheme_ref(ao_poly poly);
+
+ao_poly
+ao_scheme_poly(const void *addr, ao_poly type);
+
+struct ao_scheme_type {
+	int	(*size)(void *addr);
+	void	(*mark)(void *addr);
+	void	(*move)(void *addr);
+	char	name[];
+};
+
+struct ao_scheme_cons {
+	ao_poly		car;
+	ao_poly		cdr;
+};
+
+struct ao_scheme_atom {
+	uint8_t		type;
+	uint8_t		pad[1];
+	ao_poly		next;
+	char		name[];
+};
+
+struct ao_scheme_val {
+	ao_poly		atom;
+	ao_poly		val;
+};
+
+struct ao_scheme_frame_vals {
+	uint8_t			type;
+	uint8_t			size;
+	struct ao_scheme_val	vals[];
+};
+
+struct ao_scheme_frame {
+	uint8_t			type;
+	uint8_t			num;
+	ao_poly			prev;
+	ao_poly			vals;
+};
+
+struct ao_scheme_bool {
+	uint8_t			type;
+	uint8_t			value;
+	uint16_t		pad;
+};
+
+struct ao_scheme_bigint {
+	uint32_t		value;
+};
+
+struct ao_scheme_float {
+	uint8_t			type;
+	uint8_t			pad1;
+	uint16_t		pad2;
+	float			value;
+};
+
+struct ao_scheme_vector {
+	uint8_t			type;
+	uint8_t			pad1;
+	uint16_t		length;
+	ao_poly			vals[];
+};
+
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+static inline uint32_t
+ao_scheme_int_bigint(int32_t i) {
+	return AO_SCHEME_BIGINT | (i << 8);
+}
+static inline int32_t
+ao_scheme_bigint_int(uint32_t bi) {
+	return (int32_t) bi >> 8;
+}
+#else
+static inline uint32_t
+ao_scheme_int_bigint(int32_t i) {
+	return (uint32_t) (i & 0xffffff) | (AO_SCHEME_BIGINT << 24);
+}
+static inlint int32_t
+ao_scheme_bigint_int(uint32_t bi) {
+	return (int32_t) (bi << 8) >> 8;
+}
+#endif
+
+#define AO_SCHEME_MIN_INT	(-(1 << (15 - AO_SCHEME_TYPE_SHIFT)))
+#define AO_SCHEME_MAX_INT	((1 << (15 - AO_SCHEME_TYPE_SHIFT)) - 1)
+#define AO_SCHEME_MIN_BIGINT	(-(1 << 24))
+#define AO_SCHEME_MAX_BIGINT	((1 << 24) - 1)
+
+#define AO_SCHEME_NOT_INTEGER	0x7fffffff
+
+/* Set on type when the frame escapes the lambda */
+#define AO_SCHEME_FRAME_MARK	0x80
+#define AO_SCHEME_FRAME_PRINT	0x40
+
+static inline int ao_scheme_frame_marked(struct ao_scheme_frame *f) {
+	return f->type & AO_SCHEME_FRAME_MARK;
+}
+
+static inline struct ao_scheme_frame *
+ao_scheme_poly_frame(ao_poly poly) {
+	return ao_scheme_ref(poly);
+}
+
+static inline ao_poly
+ao_scheme_frame_poly(struct ao_scheme_frame *frame) {
+	return ao_scheme_poly(frame, AO_SCHEME_OTHER);
+}
+
+static inline struct ao_scheme_frame_vals *
+ao_scheme_poly_frame_vals(ao_poly poly) {
+	return ao_scheme_ref(poly);
+}
+
+static inline ao_poly
+ao_scheme_frame_vals_poly(struct ao_scheme_frame_vals *vals) {
+	return ao_scheme_poly(vals, AO_SCHEME_OTHER);
+}
+
+enum eval_state {
+	eval_sexpr,		/* Evaluate an sexpr */
+	eval_val,		/* Value computed */
+	eval_formal,		/* Formal computed */
+	eval_exec,		/* Start a lambda evaluation */
+	eval_apply,		/* Execute apply */
+	eval_cond,		/* Start next cond clause */
+	eval_cond_test,		/* Check cond condition */
+	eval_begin,		/* Start next begin entry */
+	eval_while,		/* Start while condition */
+	eval_while_test,	/* Check while condition */
+	eval_macro,		/* Finished with macro generation */
+};
+
+struct ao_scheme_stack {
+	uint8_t			type;		/* AO_SCHEME_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_SCHEME_STACK_MARK	0x80	/* set on type when a reference has been taken */
+#define AO_SCHEME_STACK_PRINT	0x40	/* stack is being printed */
+
+static inline int ao_scheme_stack_marked(struct ao_scheme_stack *s) {
+	return s->type & AO_SCHEME_STACK_MARK;
+}
+
+static inline void ao_scheme_stack_mark(struct ao_scheme_stack *s) {
+	s->type |= AO_SCHEME_STACK_MARK;
+}
+
+static inline struct ao_scheme_stack *
+ao_scheme_poly_stack(ao_poly p)
+{
+	return ao_scheme_ref(p);
+}
+
+static inline ao_poly
+ao_scheme_stack_poly(struct ao_scheme_stack *stack)
+{
+	return ao_scheme_poly(stack, AO_SCHEME_OTHER);
+}
+
+extern ao_poly			ao_scheme_v;
+
+#define AO_SCHEME_FUNC_LAMBDA		0
+#define AO_SCHEME_FUNC_NLAMBDA		1
+#define AO_SCHEME_FUNC_MACRO		2
+
+#define AO_SCHEME_FUNC_FREE_ARGS	0x80
+#define AO_SCHEME_FUNC_MASK		0x7f
+
+#define AO_SCHEME_FUNC_F_LAMBDA		(AO_SCHEME_FUNC_FREE_ARGS | AO_SCHEME_FUNC_LAMBDA)
+#define AO_SCHEME_FUNC_F_NLAMBDA	(AO_SCHEME_FUNC_FREE_ARGS | AO_SCHEME_FUNC_NLAMBDA)
+#define AO_SCHEME_FUNC_F_MACRO		(AO_SCHEME_FUNC_FREE_ARGS | AO_SCHEME_FUNC_MACRO)
+
+struct ao_scheme_builtin {
+	uint8_t		type;
+	uint8_t		args;
+	uint16_t	func;
+};
+
+#define AO_SCHEME_BUILTIN_ID
+#include "ao_scheme_builtin.h"
+
+typedef ao_poly (*ao_scheme_func_t)(struct ao_scheme_cons *cons);
+
+extern const ao_scheme_func_t	ao_scheme_builtins[];
+
+static inline ao_scheme_func_t
+ao_scheme_func(struct ao_scheme_builtin *b)
+{
+	return ao_scheme_builtins[b->func];
+}
+
+struct ao_scheme_lambda {
+	uint8_t		type;
+	uint8_t		args;
+	ao_poly		code;
+	ao_poly		frame;
+};
+
+static inline struct ao_scheme_lambda *
+ao_scheme_poly_lambda(ao_poly poly)
+{
+	return ao_scheme_ref(poly);
+}
+
+static inline ao_poly
+ao_scheme_lambda_poly(struct ao_scheme_lambda *lambda)
+{
+	return ao_scheme_poly(lambda, AO_SCHEME_OTHER);
+}
+
+static inline void *
+ao_scheme_poly_other(ao_poly poly) {
+	return ao_scheme_ref(poly);
+}
+
+static inline uint8_t
+ao_scheme_other_type(void *other) {
+#if DBG_MEM
+	if ((*((uint8_t *) other) & AO_SCHEME_OTHER_TYPE_MASK) >= AO_SCHEME_NUM_TYPE)
+		ao_scheme_abort();
+#endif
+	return *((uint8_t *) other) & AO_SCHEME_OTHER_TYPE_MASK;
+}
+
+static inline ao_poly
+ao_scheme_other_poly(const void *other)
+{
+	return ao_scheme_poly(other, AO_SCHEME_OTHER);
+}
+
+static inline int
+ao_scheme_size_round(int size)
+{
+	return (size + 3) & ~3;
+}
+
+static inline int
+ao_scheme_size(const struct ao_scheme_type *type, void *addr)
+{
+	return ao_scheme_size_round(type->size(addr));
+}
+
+#define AO_SCHEME_OTHER_POLY(other) ((ao_poly)(other) + AO_SCHEME_OTHER)
+
+static inline int ao_scheme_poly_base_type(ao_poly poly) {
+	return poly & AO_SCHEME_TYPE_MASK;
+}
+
+static inline int ao_scheme_poly_type(ao_poly poly) {
+	int	type = poly & AO_SCHEME_TYPE_MASK;
+	if (type == AO_SCHEME_OTHER)
+		return ao_scheme_other_type(ao_scheme_poly_other(poly));
+	return type;
+}
+
+static inline int
+ao_scheme_is_cons(ao_poly poly) {
+	return (ao_scheme_poly_base_type(poly) == AO_SCHEME_CONS);
+}
+
+static inline int
+ao_scheme_is_pair(ao_poly poly) {
+	return poly != AO_SCHEME_NIL && (ao_scheme_poly_base_type(poly) == AO_SCHEME_CONS);
+}
+
+static inline struct ao_scheme_cons *
+ao_scheme_poly_cons(ao_poly poly)
+{
+	return ao_scheme_ref(poly);
+}
+
+static inline ao_poly
+ao_scheme_cons_poly(struct ao_scheme_cons *cons)
+{
+	return ao_scheme_poly(cons, AO_SCHEME_CONS);
+}
+
+static inline int32_t
+ao_scheme_poly_int(ao_poly poly)
+{
+	return (int32_t) ((ao_signed_poly) poly >> AO_SCHEME_TYPE_SHIFT);
+}
+
+static inline ao_poly
+ao_scheme_int_poly(int32_t i)
+{
+	return ((ao_poly) i << 2) | AO_SCHEME_INT;
+}
+
+static inline struct ao_scheme_bigint *
+ao_scheme_poly_bigint(ao_poly poly)
+{
+	return ao_scheme_ref(poly);
+}
+
+static inline ao_poly
+ao_scheme_bigint_poly(struct ao_scheme_bigint *bi)
+{
+	return ao_scheme_poly(bi, AO_SCHEME_OTHER);
+}
+
+static inline char *
+ao_scheme_poly_string(ao_poly poly)
+{
+	return ao_scheme_ref(poly);
+}
+
+static inline ao_poly
+ao_scheme_string_poly(char *s)
+{
+	return ao_scheme_poly(s, AO_SCHEME_STRING);
+}
+
+static inline struct ao_scheme_atom *
+ao_scheme_poly_atom(ao_poly poly)
+{
+	return ao_scheme_ref(poly);
+}
+
+static inline ao_poly
+ao_scheme_atom_poly(struct ao_scheme_atom *a)
+{
+	return ao_scheme_poly(a, AO_SCHEME_OTHER);
+}
+
+static inline struct ao_scheme_builtin *
+ao_scheme_poly_builtin(ao_poly poly)
+{
+	return ao_scheme_ref(poly);
+}
+
+static inline ao_poly
+ao_scheme_builtin_poly(struct ao_scheme_builtin *b)
+{
+	return ao_scheme_poly(b, AO_SCHEME_OTHER);
+}
+
+static inline ao_poly
+ao_scheme_bool_poly(struct ao_scheme_bool *b)
+{
+	return ao_scheme_poly(b, AO_SCHEME_OTHER);
+}
+
+static inline struct ao_scheme_bool *
+ao_scheme_poly_bool(ao_poly poly)
+{
+	return ao_scheme_ref(poly);
+}
+
+static inline ao_poly
+ao_scheme_float_poly(struct ao_scheme_float *f)
+{
+	return ao_scheme_poly(f, AO_SCHEME_OTHER);
+}
+
+static inline struct ao_scheme_float *
+ao_scheme_poly_float(ao_poly poly)
+{
+	return ao_scheme_ref(poly);
+}
+
+float
+ao_scheme_poly_number(ao_poly p);
+
+static inline ao_poly
+ao_scheme_vector_poly(struct ao_scheme_vector *v)
+{
+	return ao_scheme_poly(v, AO_SCHEME_OTHER);
+}
+
+static inline struct ao_scheme_vector *
+ao_scheme_poly_vector(ao_poly poly)
+{
+	return ao_scheme_ref(poly);
+}
+
+/* memory functions */
+
+extern uint64_t ao_scheme_collects[2];
+extern uint64_t ao_scheme_freed[2];
+extern uint64_t ao_scheme_loops[2];
+
+/* returns 1 if the object was already marked */
+int
+ao_scheme_mark(const struct ao_scheme_type *type, void *addr);
+
+/* returns 1 if the object was already marked */
+int
+ao_scheme_mark_memory(const struct ao_scheme_type *type, void *addr);
+
+void *
+ao_scheme_move_map(void *addr);
+
+/* returns 1 if the object was already moved */
+int
+ao_scheme_move(const struct ao_scheme_type *type, void **ref);
+
+/* returns 1 if the object was already moved */
+int
+ao_scheme_move_memory(const struct ao_scheme_type *type, void **ref);
+
+void *
+ao_scheme_alloc(int size);
+
+#define AO_SCHEME_COLLECT_FULL		1
+#define AO_SCHEME_COLLECT_INCREMENTAL	0
+
+int
+ao_scheme_collect(uint8_t style);
+
+#if DBG_FREE_CONS
+void
+ao_scheme_cons_check(struct ao_scheme_cons *cons);
+#endif
+
+void
+ao_scheme_cons_stash(int id, struct ao_scheme_cons *cons);
+
+struct ao_scheme_cons *
+ao_scheme_cons_fetch(int id);
+
+void
+ao_scheme_poly_stash(int id, ao_poly poly);
+
+ao_poly
+ao_scheme_poly_fetch(int id);
+
+void
+ao_scheme_string_stash(int id, char *string);
+
+char *
+ao_scheme_string_fetch(int id);
+
+static inline void
+ao_scheme_stack_stash(int id, struct ao_scheme_stack *stack) {
+	ao_scheme_poly_stash(id, ao_scheme_stack_poly(stack));
+}
+
+static inline struct ao_scheme_stack *
+ao_scheme_stack_fetch(int id) {
+	return ao_scheme_poly_stack(ao_scheme_poly_fetch(id));
+}
+
+void
+ao_scheme_frame_stash(int id, struct ao_scheme_frame *frame);
+
+struct ao_scheme_frame *
+ao_scheme_frame_fetch(int id);
+
+/* bool */
+
+extern const struct ao_scheme_type ao_scheme_bool_type;
+
+void
+ao_scheme_bool_write(ao_poly v);
+
+#ifdef AO_SCHEME_MAKE_CONST
+struct ao_scheme_bool	*ao_scheme_true, *ao_scheme_false;
+
+struct ao_scheme_bool *
+ao_scheme_bool_get(uint8_t value);
+#endif
+
+/* cons */
+extern const struct ao_scheme_type ao_scheme_cons_type;
+
+struct ao_scheme_cons *
+ao_scheme_cons_cons(ao_poly car, ao_poly cdr);
+
+/* Return a cons or NULL for a proper list, else error */
+struct ao_scheme_cons *
+ao_scheme_cons_cdr(struct ao_scheme_cons *cons);
+
+ao_poly
+ao_scheme__cons(ao_poly car, ao_poly cdr);
+
+extern struct ao_scheme_cons *ao_scheme_cons_free_list;
+
+void
+ao_scheme_cons_free(struct ao_scheme_cons *cons);
+
+void
+ao_scheme_cons_write(ao_poly);
+
+void
+ao_scheme_cons_display(ao_poly);
+
+int
+ao_scheme_cons_length(struct ao_scheme_cons *cons);
+
+struct ao_scheme_cons *
+ao_scheme_cons_copy(struct ao_scheme_cons *cons);
+
+/* string */
+extern const struct ao_scheme_type ao_scheme_string_type;
+
+char *
+ao_scheme_string_copy(char *a);
+
+char *
+ao_scheme_string_cat(char *a, char *b);
+
+ao_poly
+ao_scheme_string_pack(struct ao_scheme_cons *cons);
+
+ao_poly
+ao_scheme_string_unpack(char *a);
+
+void
+ao_scheme_string_write(ao_poly s);
+
+void
+ao_scheme_string_display(ao_poly s);
+
+/* atom */
+extern const struct ao_scheme_type ao_scheme_atom_type;
+
+extern struct ao_scheme_atom	*ao_scheme_atoms;
+extern struct ao_scheme_frame	*ao_scheme_frame_global;
+extern struct ao_scheme_frame	*ao_scheme_frame_current;
+
+void
+ao_scheme_atom_write(ao_poly a);
+
+struct ao_scheme_atom *
+ao_scheme_atom_intern(char *name);
+
+ao_poly *
+ao_scheme_atom_ref(ao_poly atom, struct ao_scheme_frame **frame_ref);
+
+ao_poly
+ao_scheme_atom_get(ao_poly atom);
+
+ao_poly
+ao_scheme_atom_set(ao_poly atom, ao_poly val);
+
+ao_poly
+ao_scheme_atom_def(ao_poly atom, ao_poly val);
+
+/* int */
+void
+ao_scheme_int_write(ao_poly i);
+
+int32_t
+ao_scheme_poly_integer(ao_poly p);
+
+ao_poly
+ao_scheme_integer_poly(int32_t i);
+
+static inline int
+ao_scheme_integer_typep(uint8_t t)
+{
+	return (t == AO_SCHEME_INT) || (t == AO_SCHEME_BIGINT);
+}
+
+void
+ao_scheme_bigint_write(ao_poly i);
+
+extern const struct ao_scheme_type	ao_scheme_bigint_type;
+
+/* vector */
+
+void
+ao_scheme_vector_write(ao_poly v);
+
+void
+ao_scheme_vector_display(ao_poly v);
+
+struct ao_scheme_vector *
+ao_scheme_vector_alloc(uint16_t length, ao_poly fill);
+
+ao_poly
+ao_scheme_vector_get(ao_poly v, ao_poly i);
+
+ao_poly
+ao_scheme_vector_set(ao_poly v, ao_poly i, ao_poly p);
+
+struct ao_scheme_vector *
+ao_scheme_list_to_vector(struct ao_scheme_cons *cons);
+
+struct ao_scheme_cons *
+ao_scheme_vector_to_list(struct ao_scheme_vector *vector);
+
+extern const struct ao_scheme_type	ao_scheme_vector_type;
+
+/* prim */
+void
+ao_scheme_poly_write(ao_poly p);
+
+void
+ao_scheme_poly_display(ao_poly p);
+
+int
+ao_scheme_poly_mark(ao_poly p, uint8_t note_cons);
+
+/* returns 1 if the object has already been moved */
+int
+ao_scheme_poly_move(ao_poly *p, uint8_t note_cons);
+
+/* eval */
+
+void
+ao_scheme_eval_clear_globals(void);
+
+int
+ao_scheme_eval_restart(void);
+
+ao_poly
+ao_scheme_eval(ao_poly p);
+
+ao_poly
+ao_scheme_set_cond(struct ao_scheme_cons *cons);
+
+/* float */
+extern const struct ao_scheme_type ao_scheme_float_type;
+
+void
+ao_scheme_float_write(ao_poly p);
+
+ao_poly
+ao_scheme_float_get(float value);
+
+static inline uint8_t
+ao_scheme_number_typep(uint8_t t)
+{
+	return ao_scheme_integer_typep(t) || (t == AO_SCHEME_FLOAT);
+}
+
+float
+ao_scheme_poly_number(ao_poly p);
+
+/* builtin */
+void
+ao_scheme_builtin_write(ao_poly b);
+
+extern const struct ao_scheme_type ao_scheme_builtin_type;
+
+/* Check argument count */
+ao_poly
+ao_scheme_check_argc(ao_poly name, struct ao_scheme_cons *cons, int min, int max);
+
+/* Check argument type */
+ao_poly
+ao_scheme_check_argt(ao_poly name, struct ao_scheme_cons *cons, int argc, int type, int nil_ok);
+
+/* Fetch an arg (nil if off the end) */
+ao_poly
+ao_scheme_arg(struct ao_scheme_cons *cons, int argc);
+
+char *
+ao_scheme_args_name(uint8_t args);
+
+/* read */
+extern int			ao_scheme_read_list;
+extern struct ao_scheme_cons	*ao_scheme_read_cons;
+extern struct ao_scheme_cons	*ao_scheme_read_cons_tail;
+extern struct ao_scheme_cons	*ao_scheme_read_stack;
+
+ao_poly
+ao_scheme_read(void);
+
+/* rep */
+ao_poly
+ao_scheme_read_eval_print(void);
+
+/* frame */
+extern const struct ao_scheme_type ao_scheme_frame_type;
+extern const struct ao_scheme_type ao_scheme_frame_vals_type;
+
+#define AO_SCHEME_FRAME_FREE	6
+
+extern struct ao_scheme_frame	*ao_scheme_frame_free_list[AO_SCHEME_FRAME_FREE];
+
+ao_poly
+ao_scheme_frame_mark(struct ao_scheme_frame *frame);
+
+ao_poly *
+ao_scheme_frame_ref(struct ao_scheme_frame *frame, ao_poly atom);
+
+struct ao_scheme_frame *
+ao_scheme_frame_new(int num);
+
+void
+ao_scheme_frame_free(struct ao_scheme_frame *frame);
+
+void
+ao_scheme_frame_bind(struct ao_scheme_frame *frame, int num, ao_poly atom, ao_poly val);
+
+ao_poly
+ao_scheme_frame_add(struct ao_scheme_frame *frame, ao_poly atom, ao_poly val);
+
+void
+ao_scheme_frame_write(ao_poly p);
+
+void
+ao_scheme_frame_init(void);
+
+/* lambda */
+extern const struct ao_scheme_type ao_scheme_lambda_type;
+
+extern const char * const ao_scheme_state_names[];
+
+struct ao_scheme_lambda *
+ao_scheme_lambda_new(ao_poly cons);
+
+void
+ao_scheme_lambda_write(ao_poly lambda);
+
+ao_poly
+ao_scheme_lambda_eval(void);
+
+/* stack */
+
+extern const struct ao_scheme_type ao_scheme_stack_type;
+extern struct ao_scheme_stack	*ao_scheme_stack;
+extern struct ao_scheme_stack	*ao_scheme_stack_free_list;
+
+void
+ao_scheme_stack_reset(struct ao_scheme_stack *stack);
+
+int
+ao_scheme_stack_push(void);
+
+void
+ao_scheme_stack_pop(void);
+
+void
+ao_scheme_stack_clear(void);
+
+void
+ao_scheme_stack_write(ao_poly stack);
+
+ao_poly
+ao_scheme_stack_eval(void);
+
+/* error */
+
+void
+ao_scheme_vprintf(char *format, va_list args);
+
+void
+ao_scheme_printf(char *format, ...);
+
+void
+ao_scheme_error_poly(char *name, ao_poly poly, ao_poly last);
+
+void
+ao_scheme_error_frame(int indent, char *name, struct ao_scheme_frame *frame);
+
+ao_poly
+ao_scheme_error(int error, char *format, ...);
+
+/* builtins */
+
+#define AO_SCHEME_BUILTIN_DECLS
+#include "ao_scheme_builtin.h"
+
+/* debugging macros */
+
+#if DBG_EVAL || DBG_READ || DBG_MEM
+#define DBG_CODE	1
+int ao_scheme_stack_depth;
+#define DBG_DO(a)	a
+#define DBG_INDENT()	do { int _s; for(_s = 0; _s < ao_scheme_stack_depth; _s++) printf("  "); } while(0)
+#define DBG_IN()	(++ao_scheme_stack_depth)
+#define DBG_OUT()	(--ao_scheme_stack_depth)
+#define DBG_RESET()	(ao_scheme_stack_depth = 0)
+#define DBG(...) 	ao_scheme_printf(__VA_ARGS__)
+#define DBGI(...)	do { printf("%4d: ", __LINE__); DBG_INDENT(); DBG(__VA_ARGS__); } while (0)
+#define DBG_CONS(a)	ao_scheme_cons_write(ao_scheme_cons_poly(a))
+#define DBG_POLY(a)	ao_scheme_poly_write(a)
+#define OFFSET(a)	((a) ? (int) ((uint8_t *) a - ao_scheme_pool) : -1)
+#define DBG_STACK()	ao_scheme_stack_write(ao_scheme_stack_poly(ao_scheme_stack))
+static inline void
+ao_scheme_frames_dump(void)
+{
+	struct ao_scheme_stack *s;
+	DBGI(".. current frame: "); DBG_POLY(ao_scheme_frame_poly(ao_scheme_frame_current)); DBG("\n");
+	for (s = ao_scheme_stack; s; s = ao_scheme_poly_stack(s->prev)) {
+		DBGI(".. stack frame: "); DBG_POLY(s->frame); DBG("\n");
+	}
+}
+#define DBG_FRAMES()	ao_scheme_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
+
+#if DBG_READ
+#define RDBGI(...)	DBGI(__VA_ARGS__)
+#define RDBG_IN()	DBG_IN()
+#define RDBG_OUT()	DBG_OUT()
+#else
+#define RDBGI(...)
+#define RDBG_IN()
+#define RDBG_OUT()
+#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)	((a) ? (int) ((uint8_t *) (a) - ao_scheme_pool) : -1)
+
+extern int dbg_mem;
+
+#define MDBG_DO(a)	DBG_DO(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_SCHEME_H_ */