2 * Copyright © 2016 Keith Packard <keithp@keithp.com>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation, either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
21 #include <ao_lisp_os.h>
23 #ifdef AO_LISP_MAKE_CONST
24 #define AO_LISP_POOL_CONST 16384
25 extern uint8_t ao_lisp_const[AO_LISP_POOL_CONST];
26 #define ao_lisp_pool ao_lisp_const
27 #define AO_LISP_POOL AO_LISP_POOL_CONST
29 #define _atom(n) ao_lisp_atom_poly(ao_lisp_atom_intern(n))
31 #define _ao_lisp_atom_quote _atom("quote")
32 #define _ao_lisp_atom_set _atom("set")
33 #define _ao_lisp_atom_setq _atom("setq")
34 #define _ao_lisp_atom_t _atom("t")
35 #define _ao_lisp_atom_car _atom("car")
36 #define _ao_lisp_atom_cdr _atom("cdr")
37 #define _ao_lisp_atom_cons _atom("cons")
38 #define _ao_lisp_atom_last _atom("last")
39 #define _ao_lisp_atom_length _atom("length")
40 #define _ao_lisp_atom_cond _atom("cond")
41 #define _ao_lisp_atom_lambda _atom("lambda")
42 #define _ao_lisp_atom_led _atom("led")
43 #define _ao_lisp_atom_delay _atom("delay")
44 #define _ao_lisp_atom_pack _atom("pack")
45 #define _ao_lisp_atom_unpack _atom("unpack")
46 #define _ao_lisp_atom_flush _atom("flush")
47 #define _ao_lisp_atom_eval _atom("eval")
48 #define _ao_lisp_atom_read _atom("read")
49 #define _ao_lisp_atom_eof _atom("eof")
51 #include "ao_lisp_const.h"
53 #define AO_LISP_POOL 16384
55 extern uint8_t ao_lisp_pool[AO_LISP_POOL];
59 #define AO_LISP_CONS 0
61 #define AO_LISP_STRING 2
62 #define AO_LISP_OTHER 3
64 #define AO_LISP_TYPE_MASK 0x0003
65 #define AO_LISP_TYPE_SHIFT 2
66 #define AO_LISP_REF_MASK 0x7ffc
67 #define AO_LISP_CONST 0x8000
69 /* These have a type value at the start of the struct */
70 #define AO_LISP_ATOM 4
71 #define AO_LISP_BUILTIN 5
72 #define AO_LISP_FRAME 6
73 #define AO_LISP_LAMBDA 7
74 #define AO_LISP_NUM_TYPE 8
78 extern uint16_t ao_lisp_top;
80 #define AO_LISP_OOM 0x01
81 #define AO_LISP_DIVIDE_BY_ZERO 0x02
82 #define AO_LISP_INVALID 0x04
83 #define AO_LISP_UNDEFINED 0x08
84 #define AO_LISP_EOF 0x10
86 extern uint8_t ao_lisp_exception;
88 typedef uint16_t ao_poly;
89 typedef int16_t ao_signed_poly;
92 ao_lisp_is_const(ao_poly poly) {
93 return poly & AO_LISP_CONST;
96 #define AO_LISP_POOL_BASE (ao_lisp_pool - 4)
97 #define AO_LISP_CONST_BASE (ao_lisp_const - 4)
99 #define AO_LISP_IS_CONST(a) (ao_lisp_const <= ((uint8_t *) (a)) && ((uint8_t *) (a)) < ao_lisp_const + AO_LISP_POOL_CONST)
100 #define AO_LISP_IS_POOL(a) (ao_lisp_pool <= ((uint8_t *) (a)) && ((uint8_t *) (a)) < ao_lisp_pool + AO_LISP_POOL)
103 ao_lisp_ref(ao_poly poly) {
106 if (poly == AO_LISP_NIL)
108 if (poly & AO_LISP_CONST)
109 return (void *) (AO_LISP_CONST_BASE + (poly & AO_LISP_REF_MASK));
110 return (void *) (AO_LISP_POOL_BASE + (poly & AO_LISP_REF_MASK));
113 static inline ao_poly
114 ao_lisp_poly(const void *addr, ao_poly type) {
115 const uint8_t *a = addr;
118 if (AO_LISP_IS_CONST(a))
119 return AO_LISP_CONST | (a - AO_LISP_CONST_BASE) | type;
120 return (a - AO_LISP_POOL_BASE) | type;
123 struct ao_lisp_type {
124 int (*size)(void *addr);
125 void (*mark)(void *addr);
126 void (*move)(void *addr);
129 struct ao_lisp_cons {
134 struct ao_lisp_atom {
146 struct ao_lisp_frame {
150 struct ao_lisp_val vals[];
153 static inline struct ao_lisp_frame *
154 ao_lisp_poly_frame(ao_poly poly) {
155 return ao_lisp_ref(poly);
158 static inline ao_poly
159 ao_lisp_frame_poly(struct ao_lisp_frame *frame) {
160 return ao_lisp_poly(frame, AO_LISP_OTHER);
164 eval_sexpr, /* Evaluate an sexpr */
175 struct ao_lisp_stack {
176 uint8_t state; /* enum eval_state */
177 ao_poly prev; /* previous stack frame */
178 ao_poly sexprs; /* expressions to evaluate */
179 ao_poly values; /* values computed */
180 ao_poly values_tail; /* end of the values list for easy appending */
181 ao_poly frame; /* current lookup frame */
182 ao_poly list; /* most recent function call */
185 static inline struct ao_lisp_stack *
186 ao_lisp_poly_stack(ao_poly p)
188 return ao_lisp_ref(p);
191 static inline ao_poly
192 ao_lisp_stack_poly(struct ao_lisp_stack *stack)
194 return ao_lisp_poly(stack, AO_LISP_OTHER);
197 extern struct ao_lisp_stack *ao_lisp_stack;
198 extern ao_poly ao_lisp_v;
200 #define AO_LISP_FUNC_LAMBDA 0
201 #define AO_LISP_FUNC_NLAMBDA 1
202 #define AO_LISP_FUNC_MACRO 2
203 #define AO_LISP_FUNC_LEXPR 3
205 struct ao_lisp_builtin {
211 enum ao_lisp_builtin_id {
240 builtin_greater_equal,
249 typedef ao_poly (*ao_lisp_func_t)(struct ao_lisp_cons *cons);
251 extern const ao_lisp_func_t ao_lisp_builtins[];
253 static inline ao_lisp_func_t
254 ao_lisp_func(struct ao_lisp_builtin *b)
256 return ao_lisp_builtins[b->func];
259 struct ao_lisp_lambda {
266 static inline struct ao_lisp_lambda *
267 ao_lisp_poly_lambda(ao_poly poly)
269 return ao_lisp_ref(poly);
272 static inline ao_poly
273 ao_lisp_lambda_poly(struct ao_lisp_lambda *lambda)
275 return ao_lisp_poly(lambda, AO_LISP_OTHER);
279 ao_lisp_poly_other(ao_poly poly) {
280 return ao_lisp_ref(poly);
283 static inline uint8_t
284 ao_lisp_other_type(void *other) {
285 return *((uint8_t *) other);
288 static inline ao_poly
289 ao_lisp_other_poly(const void *other)
291 return ao_lisp_poly(other, AO_LISP_OTHER);
295 ao_lisp_mem_round(int size)
297 return (size + 3) & ~3;
300 #define AO_LISP_OTHER_POLY(other) ((ao_poly)(other) + AO_LISP_OTHER)
302 static inline int ao_lisp_poly_base_type(ao_poly poly) {
303 return poly & AO_LISP_TYPE_MASK;
306 static inline int ao_lisp_poly_type(ao_poly poly) {
307 int type = poly & AO_LISP_TYPE_MASK;
308 if (type == AO_LISP_OTHER)
309 return ao_lisp_other_type(ao_lisp_poly_other(poly));
313 static inline struct ao_lisp_cons *
314 ao_lisp_poly_cons(ao_poly poly)
316 return ao_lisp_ref(poly);
319 static inline ao_poly
320 ao_lisp_cons_poly(struct ao_lisp_cons *cons)
322 return ao_lisp_poly(cons, AO_LISP_CONS);
326 ao_lisp_poly_int(ao_poly poly)
328 return (int) ((ao_signed_poly) poly >> AO_LISP_TYPE_SHIFT);
331 static inline ao_poly
332 ao_lisp_int_poly(int i)
334 return ((ao_poly) i << 2) | AO_LISP_INT;
338 ao_lisp_poly_string(ao_poly poly)
340 return ao_lisp_ref(poly);
343 static inline ao_poly
344 ao_lisp_string_poly(char *s)
346 return ao_lisp_poly(s, AO_LISP_STRING);
349 static inline struct ao_lisp_atom *
350 ao_lisp_poly_atom(ao_poly poly)
352 return ao_lisp_ref(poly);
355 static inline ao_poly
356 ao_lisp_atom_poly(struct ao_lisp_atom *a)
358 return ao_lisp_poly(a, AO_LISP_OTHER);
361 static inline struct ao_lisp_builtin *
362 ao_lisp_poly_builtin(ao_poly poly)
364 return ao_lisp_ref(poly);
367 static inline ao_poly
368 ao_lisp_builtin_poly(struct ao_lisp_builtin *b)
370 return ao_lisp_poly(b, AO_LISP_OTHER);
373 /* memory functions */
374 /* returns 1 if the object was already marked */
376 ao_lisp_mark(const struct ao_lisp_type *type, void *addr);
378 /* returns 1 if the object was already marked */
380 ao_lisp_mark_memory(void *addr, int size);
383 ao_lisp_move_map(void *addr);
385 /* returns 1 if the object was already moved */
387 ao_lisp_move(const struct ao_lisp_type *type, void **ref);
389 /* returns 1 if the object was already moved */
391 ao_lisp_move_memory(void **ref, int size);
394 ao_lisp_alloc(int size);
397 ao_lisp_collect(void);
400 ao_lisp_root_add(const struct ao_lisp_type *type, void *addr);
403 ao_lisp_root_poly_add(ao_poly *p);
406 ao_lisp_root_clear(void *addr);
409 extern const struct ao_lisp_type ao_lisp_cons_type;
411 struct ao_lisp_cons *
412 ao_lisp_cons_cons(ao_poly car, struct ao_lisp_cons *cdr);
415 ao_lisp_cons_print(ao_poly);
418 ao_lisp_cons_patom(ao_poly);
421 ao_lisp_cons_length(struct ao_lisp_cons *cons);
424 extern const struct ao_lisp_type ao_lisp_string_type;
427 ao_lisp_string_new(int len);
430 ao_lisp_string_copy(char *a);
433 ao_lisp_string_cat(char *a, char *b);
436 ao_lisp_string_pack(struct ao_lisp_cons *cons);
439 ao_lisp_string_unpack(char *a);
442 ao_lisp_string_print(ao_poly s);
445 ao_lisp_string_patom(ao_poly s);
448 extern const struct ao_lisp_type ao_lisp_atom_type;
450 extern struct ao_lisp_atom *ao_lisp_atoms;
451 extern struct ao_lisp_frame *ao_lisp_frame_global;
452 extern struct ao_lisp_frame *ao_lisp_frame_current;
455 ao_lisp_atom_print(ao_poly a);
457 struct ao_lisp_atom *
458 ao_lisp_atom_intern(char *name);
461 ao_lisp_atom_get(ao_poly atom);
464 ao_lisp_atom_set(ao_poly atom, ao_poly val);
468 ao_lisp_int_print(ao_poly i);
472 ao_lisp_poly_print(ao_poly p);
475 ao_lisp_poly_patom(ao_poly p);
478 ao_lisp_poly_mark(ao_poly p, uint8_t note_cons);
480 /* returns 1 if the object has already been moved */
482 ao_lisp_poly_move(ao_poly *p, uint8_t note_cons);
487 ao_lisp_eval(ao_poly p);
490 ao_lisp_set_cond(struct ao_lisp_cons *cons);
494 ao_lisp_builtin_print(ao_poly b);
496 extern const struct ao_lisp_type ao_lisp_builtin_type;
498 /* Check argument count */
500 ao_lisp_check_argc(ao_poly name, struct ao_lisp_cons *cons, int min, int max);
502 /* Check argument type */
504 ao_lisp_check_argt(ao_poly name, struct ao_lisp_cons *cons, int argc, int type, int nil_ok);
506 /* Fetch an arg (nil if off the end) */
508 ao_lisp_arg(struct ao_lisp_cons *cons, int argc);
511 ao_lisp_args_name(uint8_t args);
519 ao_lisp_read_eval_print(void);
522 extern const struct ao_lisp_type ao_lisp_frame_type;
525 ao_lisp_frame_ref(struct ao_lisp_frame *frame, ao_poly atom);
527 struct ao_lisp_frame *
528 ao_lisp_frame_new(int num);
531 ao_lisp_frame_add(struct ao_lisp_frame **frame, ao_poly atom, ao_poly val);
534 ao_lisp_frame_print(ao_poly p);
537 extern const struct ao_lisp_type ao_lisp_lambda_type;
539 struct ao_lisp_lambda *
540 ao_lisp_lambda_new(ao_poly cons);
543 ao_lisp_lambda_print(ao_poly lambda);
546 ao_lisp_lambda(struct ao_lisp_cons *cons);
549 ao_lisp_lexpr(struct ao_lisp_cons *cons);
552 ao_lisp_nlambda(struct ao_lisp_cons *cons);
555 ao_lisp_macro(struct ao_lisp_cons *cons);
558 ao_lisp_lambda_eval(void);
563 ao_lisp_stack_print(void);
566 ao_lisp_error(int error, char *format, ...);
568 /* debugging macros */
572 int ao_lisp_stack_depth;
574 #define DBG_INDENT() do { int _s; for(_s = 0; _s < ao_lisp_stack_depth; _s++) printf(" "); } while(0)
575 #define DBG_IN() (++ao_lisp_stack_depth)
576 #define DBG_OUT() (--ao_lisp_stack_depth)
577 #define DBG_RESET() (ao_lisp_stack_depth = 0)
578 #define DBG(...) printf(__VA_ARGS__)
579 #define DBGI(...) do { DBG("%4d: ", __LINE__); DBG_INDENT(); DBG(__VA_ARGS__); } while (0)
580 #define DBG_CONS(a) ao_lisp_cons_print(ao_lisp_cons_poly(a))
581 #define DBG_POLY(a) ao_lisp_poly_print(a)
582 #define OFFSET(a) ((a) ? (int) ((uint8_t *) a - ao_lisp_pool) : -1)
583 #define DBG_STACK() ao_lisp_stack_print()
585 ao_lisp_frames_dump(void)
587 struct ao_lisp_stack *s;
588 DBGI(".. current frame: "); DBG_POLY(ao_lisp_frame_poly(ao_lisp_frame_current)); DBG("\n");
589 for (s = ao_lisp_stack; s; s = ao_lisp_poly_stack(s->prev)) {
590 DBGI(".. stack frame: "); DBG_POLY(s->frame); DBG("\n");
593 #define DBG_FRAMES() ao_lisp_frames_dump()
608 #endif /* _AO_LISP_H_ */