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.
20 #if !defined(AO_LISP_TEST) && !defined(AO_LISP_MAKE_CONST)
22 #define AO_LISP_ALTOS 1
23 #define abort() ao_panic(1)
30 #ifdef AO_LISP_MAKE_CONST
31 #define AO_LISP_POOL_CONST 16384
32 extern uint8_t ao_lisp_const[AO_LISP_POOL_CONST];
33 #define ao_lisp_pool ao_lisp_const
34 #define AO_LISP_POOL AO_LISP_POOL_CONST
36 #define _atom(n) ao_lisp_atom_poly(ao_lisp_atom_intern(n))
38 #define _ao_lisp_atom_quote _atom("quote")
39 #define _ao_lisp_atom_set _atom("set")
40 #define _ao_lisp_atom_setq _atom("setq")
41 #define _ao_lisp_atom_t _atom("t")
42 #define _ao_lisp_atom_car _atom("car")
43 #define _ao_lisp_atom_cdr _atom("cdr")
44 #define _ao_lisp_atom_cons _atom("cons")
45 #define _ao_lisp_atom_last _atom("last")
46 #define _ao_lisp_atom_cond _atom("cond")
47 #define _ao_lisp_atom_lambda _atom("lambda")
49 #include "ao_lisp_const.h"
51 #define AO_LISP_POOL 16384
53 extern uint8_t ao_lisp_pool[AO_LISP_POOL];
57 #define AO_LISP_CONS 0
59 #define AO_LISP_STRING 2
60 #define AO_LISP_OTHER 3
62 #define AO_LISP_TYPE_MASK 0x0003
63 #define AO_LISP_TYPE_SHIFT 2
64 #define AO_LISP_REF_MASK 0x7ffc
65 #define AO_LISP_CONST 0x8000
67 /* These have a type value at the start of the struct */
68 #define AO_LISP_ATOM 4
69 #define AO_LISP_BUILTIN 5
70 #define AO_LISP_FRAME 6
71 #define AO_LISP_LAMBDA 7
72 #define AO_LISP_NUM_TYPE 8
76 extern uint16_t ao_lisp_top;
78 #define AO_LISP_OOM 0x01
79 #define AO_LISP_DIVIDE_BY_ZERO 0x02
80 #define AO_LISP_INVALID 0x04
81 #define AO_LISP_UNDEFINED 0x08
83 extern uint8_t ao_lisp_exception;
85 typedef uint16_t ao_poly;
86 typedef int16_t ao_signed_poly;
89 ao_lisp_is_const(ao_poly poly) {
90 return poly & AO_LISP_CONST;
93 #define AO_LISP_POOL_BASE (ao_lisp_pool - 4)
94 #define AO_LISP_CONST_BASE (ao_lisp_const - 4)
96 #define AO_LISP_IS_CONST(a) (ao_lisp_const <= ((uint8_t *) (a)) && ((uint8_t *) (a)) < ao_lisp_const + AO_LISP_POOL_CONST)
97 #define AO_LISP_IS_POOL(a) (ao_lisp_pool <= ((uint8_t *) (a)) && ((uint8_t *) (a)) < ao_lisp_pool + AO_LISP_POOL)
100 ao_lisp_ref(ao_poly poly) {
103 if (poly == AO_LISP_NIL)
105 if (poly & AO_LISP_CONST)
106 return (void *) (AO_LISP_CONST_BASE + (poly & AO_LISP_REF_MASK));
107 return (void *) (AO_LISP_POOL_BASE + (poly & AO_LISP_REF_MASK));
110 static inline ao_poly
111 ao_lisp_poly(const void *addr, ao_poly type) {
112 const uint8_t *a = addr;
115 if (AO_LISP_IS_CONST(a))
116 return AO_LISP_CONST | (a - AO_LISP_CONST_BASE) | type;
117 return (a - AO_LISP_POOL_BASE) | type;
120 struct ao_lisp_type {
121 int (*size)(void *addr);
122 void (*mark)(void *addr);
123 void (*move)(void *addr);
126 struct ao_lisp_cons {
131 struct ao_lisp_atom {
143 struct ao_lisp_frame {
147 struct ao_lisp_val vals[];
150 static inline struct ao_lisp_frame *
151 ao_lisp_poly_frame(ao_poly poly) {
152 return ao_lisp_ref(poly);
155 static inline ao_poly
156 ao_lisp_frame_poly(struct ao_lisp_frame *frame) {
157 return ao_lisp_poly(frame, AO_LISP_OTHER);
161 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 {
229 builtin_greater_equal,
233 typedef ao_poly (*ao_lisp_func_t)(struct ao_lisp_cons *cons);
235 extern ao_lisp_func_t ao_lisp_builtins[];
237 static inline ao_lisp_func_t
238 ao_lisp_func(struct ao_lisp_builtin *b)
240 return ao_lisp_builtins[b->func];
243 struct ao_lisp_lambda {
250 static inline struct ao_lisp_lambda *
251 ao_lisp_poly_lambda(ao_poly poly)
253 return ao_lisp_ref(poly);
256 static inline ao_poly
257 ao_lisp_lambda_poly(struct ao_lisp_lambda *lambda)
259 return ao_lisp_poly(lambda, AO_LISP_OTHER);
263 ao_lisp_poly_other(ao_poly poly) {
264 return ao_lisp_ref(poly);
267 static inline uint8_t
268 ao_lisp_other_type(void *other) {
269 return *((uint8_t *) other);
272 static inline ao_poly
273 ao_lisp_other_poly(const void *other)
275 return ao_lisp_poly(other, AO_LISP_OTHER);
279 ao_lisp_mem_round(int size)
281 return (size + 3) & ~3;
284 #define AO_LISP_OTHER_POLY(other) ((ao_poly)(other) + AO_LISP_OTHER)
286 static inline int ao_lisp_poly_base_type(ao_poly poly) {
287 return poly & AO_LISP_TYPE_MASK;
290 static inline int ao_lisp_poly_type(ao_poly poly) {
291 int type = poly & AO_LISP_TYPE_MASK;
292 if (type == AO_LISP_OTHER)
293 return ao_lisp_other_type(ao_lisp_poly_other(poly));
297 static inline struct ao_lisp_cons *
298 ao_lisp_poly_cons(ao_poly poly)
300 return ao_lisp_ref(poly);
303 static inline ao_poly
304 ao_lisp_cons_poly(struct ao_lisp_cons *cons)
306 return ao_lisp_poly(cons, AO_LISP_CONS);
310 ao_lisp_poly_int(ao_poly poly)
312 return (int) ((ao_signed_poly) poly >> AO_LISP_TYPE_SHIFT);
315 static inline ao_poly
316 ao_lisp_int_poly(int i)
318 return ((ao_poly) i << 2) | AO_LISP_INT;
322 ao_lisp_poly_string(ao_poly poly)
324 return ao_lisp_ref(poly);
327 static inline ao_poly
328 ao_lisp_string_poly(char *s)
330 return ao_lisp_poly(s, AO_LISP_STRING);
333 static inline struct ao_lisp_atom *
334 ao_lisp_poly_atom(ao_poly poly)
336 return ao_lisp_ref(poly);
339 static inline ao_poly
340 ao_lisp_atom_poly(struct ao_lisp_atom *a)
342 return ao_lisp_poly(a, AO_LISP_OTHER);
345 static inline struct ao_lisp_builtin *
346 ao_lisp_poly_builtin(ao_poly poly)
348 return ao_lisp_ref(poly);
351 static inline ao_poly
352 ao_lisp_builtin_poly(struct ao_lisp_builtin *b)
354 return ao_lisp_poly(b, AO_LISP_OTHER);
357 /* memory functions */
358 /* returns 1 if the object was already marked */
360 ao_lisp_mark(const struct ao_lisp_type *type, void *addr);
362 /* returns 1 if the object was already marked */
364 ao_lisp_mark_memory(void *addr, int size);
367 ao_lisp_move_map(void *addr);
369 /* returns 1 if the object was already moved */
371 ao_lisp_move(const struct ao_lisp_type *type, void **ref);
373 /* returns 1 if the object was already moved */
375 ao_lisp_move_memory(void **ref, int size);
378 ao_lisp_alloc(int size);
381 ao_lisp_collect(void);
384 ao_lisp_root_add(const struct ao_lisp_type *type, void *addr);
387 ao_lisp_root_poly_add(ao_poly *p);
390 ao_lisp_root_clear(void *addr);
393 extern const struct ao_lisp_type ao_lisp_cons_type;
395 struct ao_lisp_cons *
396 ao_lisp_cons_cons(ao_poly car, struct ao_lisp_cons *cdr);
399 ao_lisp_cons_print(ao_poly);
402 ao_lisp_cons_patom(ao_poly);
405 extern const struct ao_lisp_type ao_lisp_string_type;
408 ao_lisp_string_new(int len);
411 ao_lisp_string_copy(char *a);
414 ao_lisp_string_cat(char *a, char *b);
417 ao_lisp_string_print(ao_poly s);
420 ao_lisp_string_patom(ao_poly s);
423 extern const struct ao_lisp_type ao_lisp_atom_type;
425 extern struct ao_lisp_atom *ao_lisp_atoms;
426 extern struct ao_lisp_frame *ao_lisp_frame_global;
427 extern struct ao_lisp_frame *ao_lisp_frame_current;
430 ao_lisp_atom_print(ao_poly a);
432 struct ao_lisp_atom *
433 ao_lisp_atom_intern(char *name);
436 ao_lisp_atom_get(ao_poly atom);
439 ao_lisp_atom_set(ao_poly atom, ao_poly val);
443 ao_lisp_int_print(ao_poly i);
447 ao_lisp_poly_print(ao_poly p);
450 ao_lisp_poly_patom(ao_poly p);
453 ao_lisp_poly_mark(ao_poly p, uint8_t note_cons);
455 /* returns 1 if the object has already been moved */
457 ao_lisp_poly_move(ao_poly *p, uint8_t note_cons);
462 ao_lisp_eval(ao_poly p);
465 ao_lisp_set_cond(struct ao_lisp_cons *cons);
469 ao_lisp_builtin_print(ao_poly b);
471 extern const struct ao_lisp_type ao_lisp_builtin_type;
473 /* Check argument count */
475 ao_lisp_check_argc(ao_poly name, struct ao_lisp_cons *cons, int min, int max);
477 /* Check argument type */
479 ao_lisp_check_argt(ao_poly name, struct ao_lisp_cons *cons, int argc, int type, int nil_ok);
481 /* Fetch an arg (nil if off the end) */
483 ao_lisp_arg(struct ao_lisp_cons *cons, int argc);
486 ao_lisp_args_name(uint8_t args);
494 ao_lisp_read_eval_print(void);
497 extern const struct ao_lisp_type ao_lisp_frame_type;
500 ao_lisp_frame_ref(struct ao_lisp_frame *frame, ao_poly atom);
502 struct ao_lisp_frame *
503 ao_lisp_frame_new(int num);
505 struct ao_lisp_frame *
506 ao_lisp_frame_add(struct ao_lisp_frame *frame, ao_poly atom, ao_poly val);
509 ao_lisp_frame_print(ao_poly p);
512 extern const struct ao_lisp_type ao_lisp_lambda_type;
514 struct ao_lisp_lambda *
515 ao_lisp_lambda_new(ao_poly cons);
518 ao_lisp_lambda_print(ao_poly lambda);
521 ao_lisp_lambda(struct ao_lisp_cons *cons);
524 ao_lisp_lexpr(struct ao_lisp_cons *cons);
527 ao_lisp_nlambda(struct ao_lisp_cons *cons);
530 ao_lisp_macro(struct ao_lisp_cons *cons);
533 ao_lisp_lambda_eval(struct ao_lisp_lambda *lambda,
534 struct ao_lisp_cons *cons);
539 ao_lisp_stack_print(void);
542 ao_lisp_error(int error, char *format, ...);
544 /* debugging macros */
548 int ao_lisp_stack_depth;
550 #define DBG_INDENT() do { int _s; for(_s = 0; _s < ao_lisp_stack_depth; _s++) printf(" "); } while(0)
551 #define DBG_IN() (++ao_lisp_stack_depth)
552 #define DBG_OUT() (--ao_lisp_stack_depth)
553 #define DBG_RESET() (ao_lisp_stack_depth = 0)
554 #define DBG(...) printf(__VA_ARGS__)
555 #define DBGI(...) do { DBG("%4d: ", __LINE__); DBG_INDENT(); DBG(__VA_ARGS__); } while (0)
556 #define DBG_CONS(a) ao_lisp_cons_print(ao_lisp_cons_poly(a))
557 #define DBG_POLY(a) ao_lisp_poly_print(a)
558 #define OFFSET(a) ((a) ? (int) ((uint8_t *) a - ao_lisp_pool) : -1)
559 #define DBG_STACK() ao_lisp_stack_print()
561 ao_lisp_frames_dump(void)
563 struct ao_lisp_stack *s;
564 DBGI(".. current frame: "); DBG_POLY(ao_lisp_frame_poly(ao_lisp_frame_current)); DBG("\n");
565 for (s = ao_lisp_stack; s; s = ao_lisp_poly_stack(s->prev)) {
566 DBGI(".. stack frame: "); DBG_POLY(s->frame); DBG("\n");
569 #define DBG_FRAMES() ao_lisp_frames_dump()
584 #endif /* _AO_LISP_H_ */