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_cond _atom("cond")
40 #define _ao_lisp_atom_lambda _atom("lambda")
41 #define _ao_lisp_atom_led _atom("led")
42 #define _ao_lisp_atom_delay _atom("delay")
43 #define _ao_lisp_atom_eval _atom("eval")
44 #define _ao_lisp_atom_read _atom("read")
46 #include "ao_lisp_const.h"
48 #define AO_LISP_POOL 16384
50 extern uint8_t ao_lisp_pool[AO_LISP_POOL];
54 #define AO_LISP_CONS 0
56 #define AO_LISP_STRING 2
57 #define AO_LISP_OTHER 3
59 #define AO_LISP_TYPE_MASK 0x0003
60 #define AO_LISP_TYPE_SHIFT 2
61 #define AO_LISP_REF_MASK 0x7ffc
62 #define AO_LISP_CONST 0x8000
64 /* These have a type value at the start of the struct */
65 #define AO_LISP_ATOM 4
66 #define AO_LISP_BUILTIN 5
67 #define AO_LISP_FRAME 6
68 #define AO_LISP_LAMBDA 7
69 #define AO_LISP_NUM_TYPE 8
73 extern uint16_t ao_lisp_top;
75 #define AO_LISP_OOM 0x01
76 #define AO_LISP_DIVIDE_BY_ZERO 0x02
77 #define AO_LISP_INVALID 0x04
78 #define AO_LISP_UNDEFINED 0x08
80 extern uint8_t ao_lisp_exception;
82 typedef uint16_t ao_poly;
83 typedef int16_t ao_signed_poly;
86 ao_lisp_is_const(ao_poly poly) {
87 return poly & AO_LISP_CONST;
90 #define AO_LISP_POOL_BASE (ao_lisp_pool - 4)
91 #define AO_LISP_CONST_BASE (ao_lisp_const - 4)
93 #define AO_LISP_IS_CONST(a) (ao_lisp_const <= ((uint8_t *) (a)) && ((uint8_t *) (a)) < ao_lisp_const + AO_LISP_POOL_CONST)
94 #define AO_LISP_IS_POOL(a) (ao_lisp_pool <= ((uint8_t *) (a)) && ((uint8_t *) (a)) < ao_lisp_pool + AO_LISP_POOL)
97 ao_lisp_ref(ao_poly poly) {
100 if (poly == AO_LISP_NIL)
102 if (poly & AO_LISP_CONST)
103 return (void *) (AO_LISP_CONST_BASE + (poly & AO_LISP_REF_MASK));
104 return (void *) (AO_LISP_POOL_BASE + (poly & AO_LISP_REF_MASK));
107 static inline ao_poly
108 ao_lisp_poly(const void *addr, ao_poly type) {
109 const uint8_t *a = addr;
112 if (AO_LISP_IS_CONST(a))
113 return AO_LISP_CONST | (a - AO_LISP_CONST_BASE) | type;
114 return (a - AO_LISP_POOL_BASE) | type;
117 struct ao_lisp_type {
118 int (*size)(void *addr);
119 void (*mark)(void *addr);
120 void (*move)(void *addr);
123 struct ao_lisp_cons {
128 struct ao_lisp_atom {
140 struct ao_lisp_frame {
144 struct ao_lisp_val vals[];
147 static inline struct ao_lisp_frame *
148 ao_lisp_poly_frame(ao_poly poly) {
149 return ao_lisp_ref(poly);
152 static inline ao_poly
153 ao_lisp_frame_poly(struct ao_lisp_frame *frame) {
154 return ao_lisp_poly(frame, AO_LISP_OTHER);
158 eval_sexpr, /* Evaluate an sexpr */
169 struct ao_lisp_stack {
170 uint8_t state; /* enum eval_state */
171 ao_poly prev; /* previous stack frame */
172 ao_poly sexprs; /* expressions to evaluate */
173 ao_poly values; /* values computed */
174 ao_poly values_tail; /* end of the values list for easy appending */
175 ao_poly frame; /* current lookup frame */
176 ao_poly list; /* most recent function call */
179 static inline struct ao_lisp_stack *
180 ao_lisp_poly_stack(ao_poly p)
182 return ao_lisp_ref(p);
185 static inline ao_poly
186 ao_lisp_stack_poly(struct ao_lisp_stack *stack)
188 return ao_lisp_poly(stack, AO_LISP_OTHER);
191 extern struct ao_lisp_stack *ao_lisp_stack;
192 extern ao_poly ao_lisp_v;
194 #define AO_LISP_FUNC_LAMBDA 0
195 #define AO_LISP_FUNC_NLAMBDA 1
196 #define AO_LISP_FUNC_MACRO 2
197 #define AO_LISP_FUNC_LEXPR 3
199 struct ao_lisp_builtin {
205 enum ao_lisp_builtin_id {
233 builtin_greater_equal,
239 typedef ao_poly (*ao_lisp_func_t)(struct ao_lisp_cons *cons);
241 extern const ao_lisp_func_t ao_lisp_builtins[];
243 static inline ao_lisp_func_t
244 ao_lisp_func(struct ao_lisp_builtin *b)
246 return ao_lisp_builtins[b->func];
249 struct ao_lisp_lambda {
256 static inline struct ao_lisp_lambda *
257 ao_lisp_poly_lambda(ao_poly poly)
259 return ao_lisp_ref(poly);
262 static inline ao_poly
263 ao_lisp_lambda_poly(struct ao_lisp_lambda *lambda)
265 return ao_lisp_poly(lambda, AO_LISP_OTHER);
269 ao_lisp_poly_other(ao_poly poly) {
270 return ao_lisp_ref(poly);
273 static inline uint8_t
274 ao_lisp_other_type(void *other) {
275 return *((uint8_t *) other);
278 static inline ao_poly
279 ao_lisp_other_poly(const void *other)
281 return ao_lisp_poly(other, AO_LISP_OTHER);
285 ao_lisp_mem_round(int size)
287 return (size + 3) & ~3;
290 #define AO_LISP_OTHER_POLY(other) ((ao_poly)(other) + AO_LISP_OTHER)
292 static inline int ao_lisp_poly_base_type(ao_poly poly) {
293 return poly & AO_LISP_TYPE_MASK;
296 static inline int ao_lisp_poly_type(ao_poly poly) {
297 int type = poly & AO_LISP_TYPE_MASK;
298 if (type == AO_LISP_OTHER)
299 return ao_lisp_other_type(ao_lisp_poly_other(poly));
303 static inline struct ao_lisp_cons *
304 ao_lisp_poly_cons(ao_poly poly)
306 return ao_lisp_ref(poly);
309 static inline ao_poly
310 ao_lisp_cons_poly(struct ao_lisp_cons *cons)
312 return ao_lisp_poly(cons, AO_LISP_CONS);
316 ao_lisp_poly_int(ao_poly poly)
318 return (int) ((ao_signed_poly) poly >> AO_LISP_TYPE_SHIFT);
321 static inline ao_poly
322 ao_lisp_int_poly(int i)
324 return ((ao_poly) i << 2) | AO_LISP_INT;
328 ao_lisp_poly_string(ao_poly poly)
330 return ao_lisp_ref(poly);
333 static inline ao_poly
334 ao_lisp_string_poly(char *s)
336 return ao_lisp_poly(s, AO_LISP_STRING);
339 static inline struct ao_lisp_atom *
340 ao_lisp_poly_atom(ao_poly poly)
342 return ao_lisp_ref(poly);
345 static inline ao_poly
346 ao_lisp_atom_poly(struct ao_lisp_atom *a)
348 return ao_lisp_poly(a, AO_LISP_OTHER);
351 static inline struct ao_lisp_builtin *
352 ao_lisp_poly_builtin(ao_poly poly)
354 return ao_lisp_ref(poly);
357 static inline ao_poly
358 ao_lisp_builtin_poly(struct ao_lisp_builtin *b)
360 return ao_lisp_poly(b, AO_LISP_OTHER);
363 /* memory functions */
364 /* returns 1 if the object was already marked */
366 ao_lisp_mark(const struct ao_lisp_type *type, void *addr);
368 /* returns 1 if the object was already marked */
370 ao_lisp_mark_memory(void *addr, int size);
373 ao_lisp_move_map(void *addr);
375 /* returns 1 if the object was already moved */
377 ao_lisp_move(const struct ao_lisp_type *type, void **ref);
379 /* returns 1 if the object was already moved */
381 ao_lisp_move_memory(void **ref, int size);
384 ao_lisp_alloc(int size);
387 ao_lisp_collect(void);
390 ao_lisp_root_add(const struct ao_lisp_type *type, void *addr);
393 ao_lisp_root_poly_add(ao_poly *p);
396 ao_lisp_root_clear(void *addr);
399 extern const struct ao_lisp_type ao_lisp_cons_type;
401 struct ao_lisp_cons *
402 ao_lisp_cons_cons(ao_poly car, struct ao_lisp_cons *cdr);
405 ao_lisp_cons_print(ao_poly);
408 ao_lisp_cons_patom(ao_poly);
411 extern const struct ao_lisp_type ao_lisp_string_type;
414 ao_lisp_string_new(int len);
417 ao_lisp_string_copy(char *a);
420 ao_lisp_string_cat(char *a, char *b);
423 ao_lisp_string_print(ao_poly s);
426 ao_lisp_string_patom(ao_poly s);
429 extern const struct ao_lisp_type ao_lisp_atom_type;
431 extern struct ao_lisp_atom *ao_lisp_atoms;
432 extern struct ao_lisp_frame *ao_lisp_frame_global;
433 extern struct ao_lisp_frame *ao_lisp_frame_current;
436 ao_lisp_atom_print(ao_poly a);
438 struct ao_lisp_atom *
439 ao_lisp_atom_intern(char *name);
442 ao_lisp_atom_get(ao_poly atom);
445 ao_lisp_atom_set(ao_poly atom, ao_poly val);
449 ao_lisp_int_print(ao_poly i);
453 ao_lisp_poly_print(ao_poly p);
456 ao_lisp_poly_patom(ao_poly p);
459 ao_lisp_poly_mark(ao_poly p, uint8_t note_cons);
461 /* returns 1 if the object has already been moved */
463 ao_lisp_poly_move(ao_poly *p, uint8_t note_cons);
468 ao_lisp_eval(ao_poly p);
471 ao_lisp_set_cond(struct ao_lisp_cons *cons);
475 ao_lisp_builtin_print(ao_poly b);
477 extern const struct ao_lisp_type ao_lisp_builtin_type;
479 /* Check argument count */
481 ao_lisp_check_argc(ao_poly name, struct ao_lisp_cons *cons, int min, int max);
483 /* Check argument type */
485 ao_lisp_check_argt(ao_poly name, struct ao_lisp_cons *cons, int argc, int type, int nil_ok);
487 /* Fetch an arg (nil if off the end) */
489 ao_lisp_arg(struct ao_lisp_cons *cons, int argc);
492 ao_lisp_args_name(uint8_t args);
500 ao_lisp_read_eval_print(void);
503 extern const struct ao_lisp_type ao_lisp_frame_type;
506 ao_lisp_frame_ref(struct ao_lisp_frame *frame, ao_poly atom);
508 struct ao_lisp_frame *
509 ao_lisp_frame_new(int num);
511 struct ao_lisp_frame *
512 ao_lisp_frame_add(struct ao_lisp_frame *frame, ao_poly atom, ao_poly val);
515 ao_lisp_frame_print(ao_poly p);
518 extern const struct ao_lisp_type ao_lisp_lambda_type;
520 struct ao_lisp_lambda *
521 ao_lisp_lambda_new(ao_poly cons);
524 ao_lisp_lambda_print(ao_poly lambda);
527 ao_lisp_lambda(struct ao_lisp_cons *cons);
530 ao_lisp_lexpr(struct ao_lisp_cons *cons);
533 ao_lisp_nlambda(struct ao_lisp_cons *cons);
536 ao_lisp_macro(struct ao_lisp_cons *cons);
539 ao_lisp_lambda_eval(struct ao_lisp_lambda *lambda,
540 struct ao_lisp_cons *cons);
545 ao_lisp_stack_print(void);
548 ao_lisp_error(int error, char *format, ...);
550 /* debugging macros */
554 int ao_lisp_stack_depth;
556 #define DBG_INDENT() do { int _s; for(_s = 0; _s < ao_lisp_stack_depth; _s++) printf(" "); } while(0)
557 #define DBG_IN() (++ao_lisp_stack_depth)
558 #define DBG_OUT() (--ao_lisp_stack_depth)
559 #define DBG_RESET() (ao_lisp_stack_depth = 0)
560 #define DBG(...) printf(__VA_ARGS__)
561 #define DBGI(...) do { DBG("%4d: ", __LINE__); DBG_INDENT(); DBG(__VA_ARGS__); } while (0)
562 #define DBG_CONS(a) ao_lisp_cons_print(ao_lisp_cons_poly(a))
563 #define DBG_POLY(a) ao_lisp_poly_print(a)
564 #define OFFSET(a) ((a) ? (int) ((uint8_t *) a - ao_lisp_pool) : -1)
565 #define DBG_STACK() ao_lisp_stack_print()
567 ao_lisp_frames_dump(void)
569 struct ao_lisp_stack *s;
570 DBGI(".. current frame: "); DBG_POLY(ao_lisp_frame_poly(ao_lisp_frame_current)); DBG("\n");
571 for (s = ao_lisp_stack; s; s = ao_lisp_poly_stack(s->prev)) {
572 DBGI(".. stack frame: "); DBG_POLY(s->frame); DBG("\n");
575 #define DBG_FRAMES() ao_lisp_frames_dump()
590 #endif /* _AO_LISP_H_ */