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   1 /*
   2  * Copyright © 2016 Keith Packard <keithp@keithp.com>
   3  *
   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.
   8  *
   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.
  13  */
  14
  15 #include "ao_scheme.h"
  16 #include <stdlib.h>
  17 #include <ctype.h>
  18 #include <unistd.h>
  19 #include <getopt.h>
  20 #include <stdbool.h>
  21
  22 static struct ao_scheme_builtin *
  23 ao_scheme_make_builtin(enum ao_scheme_builtin_id func, int args) {
  24         struct ao_scheme_builtin *b = ao_scheme_alloc(sizeof (struct ao_scheme_builtin));
  25
  26         b->type = AO_SCHEME_BUILTIN;
  27         b->func = func;
  28         b->args = args;
  29         return b;
  30 }
  31
  32 struct builtin_func {
  33         const char      *feature;
  34         const char      *name;
  35         int             args;
  36         enum ao_scheme_builtin_id       func;
  37 };
  38
  39 struct builtin_atom {
  40         const char      *feature;
  41         const char      *name;
  42 };
  43
  44 #define AO_SCHEME_BUILTIN_CONSTS
  45 #define AO_SCHEME_BUILTIN_ATOM_NAMES
  46
  47 #include "ao_scheme_builtin.h"
  48
  49 #define N_FUNC          (sizeof funcs / sizeof funcs[0])
  50
  51 #define N_ATOM          (sizeof atoms / sizeof atoms[0])
  52
  53 struct ao_scheme_frame  *globals;
  54
  55 static int
  56 is_atom(int offset)
  57 {
  58         struct ao_scheme_atom *a;
  59
  60         for (a = ao_scheme_atoms; a; a = ao_scheme_poly_atom(a->next))
  61                 if (((uint8_t *) a->name - ao_scheme_const) == offset)
  62                         return strlen(a->name);
  63         return 0;
  64 }
  65
  66 #define AO_FEC_CRC_INIT 0xffff
  67
  68 static inline uint16_t
  69 ao_fec_crc_byte(uint8_t byte, uint16_t crc)
  70 {
  71         uint8_t bit;
  72
  73         for (bit = 0; bit < 8; bit++) {
  74                 if (((crc & 0x8000) >> 8) ^ (byte & 0x80))
  75                         crc = (crc << 1) ^ 0x8005;
  76                 else
  77                         crc = (crc << 1);
  78                 byte <<= 1;
  79         }
  80         return crc;
  81 }
  82
  83 static uint16_t
  84 ao_fec_crc(const uint8_t *bytes, uint8_t len)
  85 {
  86         uint16_t        crc = AO_FEC_CRC_INIT;
  87
  88         while (len--)
  89                 crc = ao_fec_crc_byte(*bytes++, crc);
  90         return crc;
  91 }
  92
  93 struct ao_scheme_macro_stack {
  94         struct ao_scheme_macro_stack *next;
  95         ao_poly p;
  96 };
  97
  98 struct ao_scheme_macro_stack *macro_stack;
  99
 100 static int
 101 ao_scheme_macro_push(ao_poly p)
 102 {
 103         struct ao_scheme_macro_stack *m = macro_stack;
 104
 105         while (m) {
 106                 if (m->p == p)
 107                         return 1;
 108                 m = m->next;
 109         }
 110         m = malloc (sizeof (struct ao_scheme_macro_stack));
 111         m->p = p;
 112         m->next = macro_stack;
 113         macro_stack = m;
 114         return 0;
 115 }
 116
 117 static void
 118 ao_scheme_macro_pop(void)
 119 {
 120         struct ao_scheme_macro_stack *m = macro_stack;
 121
 122         macro_stack = m->next;
 123         free(m);
 124 }
 125
 126 #define DBG_MACRO 0
 127 #if DBG_MACRO
 128 int macro_scan_depth;
 129
 130 void indent(void)
 131 {
 132         int i;
 133         for (i = 0; i < macro_scan_depth; i++)
 134                 printf("  ");
 135 }
 136 #define MACRO_DEBUG(a)  a
 137 #else
 138 #define MACRO_DEBUG(a)
 139 #endif
 140
 141 ao_poly
 142 ao_has_macro(ao_poly p);
 143
 144 static ao_poly
 145 ao_macro_test_get(ao_poly atom)
 146 {
 147         ao_poly *ref = ao_scheme_atom_ref(atom, NULL);
 148         if (ref)
 149                 return *ref;
 150         return AO_SCHEME_NIL;
 151 }
 152
 153 static ao_poly
 154 ao_is_macro(ao_poly p)
 155 {
 156         struct ao_scheme_builtin        *builtin;
 157         struct ao_scheme_lambda *lambda;
 158         ao_poly ret;
 159
 160         MACRO_DEBUG(indent(); printf ("is macro "); ao_scheme_poly_write(p); printf("\n"); ++macro_scan_depth);
 161         switch (ao_scheme_poly_type(p)) {
 162         case AO_SCHEME_ATOM:
 163                 if (ao_scheme_macro_push(p))
 164                         ret = AO_SCHEME_NIL;
 165                 else {
 166                         if (ao_is_macro(ao_macro_test_get(p)))
 167                                 ret = p;
 168                         else
 169                                 ret = AO_SCHEME_NIL;
 170                         ao_scheme_macro_pop();
 171                 }
 172                 break;
 173         case AO_SCHEME_CONS:
 174                 ret = ao_has_macro(p);
 175                 break;
 176         case AO_SCHEME_BUILTIN:
 177                 builtin = ao_scheme_poly_builtin(p);
 178                 if ((builtin->args & AO_SCHEME_FUNC_MASK) == AO_SCHEME_FUNC_MACRO)
 179                         ret = p;
 180                 else
 181                         ret = 0;
 182                 break;
 183
 184         case AO_SCHEME_LAMBDA:
 185                 lambda = ao_scheme_poly_lambda(p);
 186                 if (lambda->args == AO_SCHEME_FUNC_MACRO)
 187                         ret = p;
 188                 else
 189                         ret = ao_has_macro(lambda->code);
 190                 break;
 191         default:
 192                 ret = AO_SCHEME_NIL;
 193                 break;
 194         }
 195         MACRO_DEBUG(--macro_scan_depth; indent(); printf ("... "); ao_scheme_poly_write(ret); printf("\n"));
 196         return ret;
 197 }
 198
 199 ao_poly
 200 ao_has_macro(ao_poly p)
 201 {
 202         struct ao_scheme_cons   *cons;
 203         struct ao_scheme_lambda *lambda;
 204         ao_poly                 m;
 205         ao_poly                 list;
 206
 207         if (p == AO_SCHEME_NIL)
 208                 return AO_SCHEME_NIL;
 209
 210         MACRO_DEBUG(indent(); printf("has macro "); ao_scheme_poly_write(p); printf("\n"); ++macro_scan_depth);
 211         switch (ao_scheme_poly_type(p)) {
 212         case AO_SCHEME_LAMBDA:
 213                 lambda = ao_scheme_poly_lambda(p);
 214                 p = ao_has_macro(lambda->code);
 215                 break;
 216         case AO_SCHEME_CONS:
 217                 cons = ao_scheme_poly_cons(p);
 218                 if ((p = ao_is_macro(cons->car)))
 219                         break;
 220
 221                 list = cons->cdr;
 222                 p = AO_SCHEME_NIL;
 223                 while (list != AO_SCHEME_NIL && AO_SCHEME_IS_CONS(list)) {
 224                         cons = ao_scheme_poly_cons(list);
 225                         m = ao_has_macro(cons->car);
 226                         if (m) {
 227                                 p = m;
 228                                 break;
 229                         }
 230                         list = cons->cdr;
 231                 }
 232                 break;
 233
 234         default:
 235                 p = AO_SCHEME_NIL;
 236                 break;
 237         }
 238         MACRO_DEBUG(--macro_scan_depth; indent(); printf("... "); ao_scheme_poly_write(p); printf("\n"));
 239         return p;
 240 }
 241
 242 static struct ao_scheme_builtin *
 243 ao_scheme_get_builtin(ao_poly p)
 244 {
 245         if (ao_scheme_poly_type(p) == AO_SCHEME_BUILTIN)
 246                 return ao_scheme_poly_builtin(p);
 247         return NULL;
 248 }
 249
 250 struct seen_builtin {
 251         struct seen_builtin             *next;
 252         struct ao_scheme_builtin        *builtin;
 253 };
 254
 255 static struct seen_builtin *seen_builtins;
 256
 257 static int
 258 ao_scheme_seen_builtin(struct ao_scheme_builtin *b)
 259 {
 260         struct seen_builtin     *s;
 261
 262         for (s = seen_builtins; s; s = s->next)
 263                 if (s->builtin == b)
 264                         return 1;
 265         s = malloc (sizeof (struct seen_builtin));
 266         s->builtin = b;
 267         s->next = seen_builtins;
 268         seen_builtins = s;
 269         return 0;
 270 }
 271
 272 static int
 273 ao_scheme_read_eval_abort(void)
 274 {
 275         ao_poly in, out = AO_SCHEME_NIL;
 276         for(;;) {
 277                 in = ao_scheme_read();
 278                 if (in == _ao_scheme_atom_eof)
 279                         break;
 280                 out = ao_scheme_eval(in);
 281                 if (ao_scheme_exception)
 282                         return 0;
 283                 ao_scheme_poly_write(out, true);
 284                 putchar ('\n');
 285         }
 286         return 1;
 287 }
 288
 289 static FILE     *in;
 290 static FILE     *out;
 291
 292 struct feature {
 293         struct feature  *next;
 294         char            name[];
 295 };
 296
 297 static struct feature *enable;
 298 static struct feature *disable;
 299
 300 static void
 301 ao_scheme_add_feature(struct feature **list, char *name)
 302 {
 303         struct feature *feature = malloc (sizeof (struct feature) + strlen(name) + 1);
 304         strcpy(feature->name, name);
 305         feature->next = *list;
 306         *list = feature;
 307 }
 308
 309 static bool
 310 ao_scheme_has_feature(struct feature *list, const char *name)
 311 {
 312         while (list) {
 313                 if (!strcmp(list->name, name))
 314                         return true;
 315                 list = list->next;
 316         }
 317         return false;
 318 }
 319
 320 static void
 321 ao_scheme_add_features(struct feature **list, const char *names)
 322 {
 323         char    *saveptr = NULL;
 324         char    *name;
 325         char    *copy = strdup(names);
 326         char    *save = copy;
 327
 328         while ((name = strtok_r(copy, ",", &saveptr)) != NULL) {
 329                 copy = NULL;
 330                 if (!ao_scheme_has_feature(*list, name))
 331                         ao_scheme_add_feature(list, name);
 332         }
 333         free(save);
 334 }
 335
 336 int
 337 ao_scheme_getc(void)
 338 {
 339         return getc(in);
 340 }
 341
 342 static const struct option options[] = {
 343         { .name = "out", .has_arg = 1, .val = 'o' },
 344         { .name = "disable", .has_arg = 1, .val = 'd' },
 345         { .name = "enable", .has_arg = 1, .val = 'e' },
 346         { 0, 0, 0, 0 }
 347 };
 348
 349 static void usage(char *program)
 350 {
 351         fprintf(stderr, "usage: %s [--out=<output>] [--disable={feature,...}] [--enable={feature,...} [input]\n", program);
 352         exit(1);
 353 }
 354
 355 int
 356 main(int argc, char **argv)
 357 {
 358         int     f, o, an;
 359         ao_poly val;
 360         struct ao_scheme_atom   *a;
 361         struct ao_scheme_builtin        *b;
 362         struct feature                  *d;
 363         int     in_atom = 0;
 364         char    *out_name = NULL;
 365         int     c;
 366         enum ao_scheme_builtin_id       prev_func;
 367         enum ao_scheme_builtin_id       target_func;
 368         enum ao_scheme_builtin_id       func_map[_builtin_last];
 369
 370         in = stdin;
 371         out = stdout;
 372
 373         while ((c = getopt_long(argc, argv, "o:d:e:", options, NULL)) != -1) {
 374                 switch (c) {
 375                 case 'o':
 376                         out_name = optarg;
 377                         break;
 378                 case 'd':
 379                         ao_scheme_add_features(&disable, optarg);
 380                         break;
 381                 case 'e':
 382                         ao_scheme_add_features(&enable, optarg);
 383                         break;
 384                 default:
 385                         usage(argv[0]);
 386                         break;
 387                 }
 388         }
 389
 390         ao_scheme_frame_init();
 391
 392         /* Boolean values #f and #t */
 393         ao_scheme_bool_get(0);
 394         ao_scheme_bool_get(1);
 395
 396         prev_func = _builtin_last;
 397         target_func = 0;
 398         b = NULL;
 399         for (f = 0; f < (int) N_FUNC; f++) {
 400                 if (ao_scheme_has_feature(enable, funcs[f].feature) || !ao_scheme_has_feature(disable, funcs[f].feature)) {
 401                         if (funcs[f].func != prev_func) {
 402                                 prev_func = funcs[f].func;
 403                                 b = ao_scheme_make_builtin(prev_func, funcs[f].args);
 404
 405                                 /* Target may have only a subset of
 406                                  * the enum values; record what those
 407                                  * values will be here. This obviously
 408                                  * depends on the functions in the
 409                                  * array being in the same order as
 410                                  * the enumeration; which
 411                                  * ao_scheme_make_builtin ensures.
 412                                  */
 413                                 func_map[prev_func] = target_func++;
 414                         }
 415                         a = ao_scheme_atom_intern((char *) funcs[f].name);
 416                         ao_scheme_atom_def(ao_scheme_atom_poly(a),
 417                                            ao_scheme_builtin_poly(b));
 418                 }
 419         }
 420
 421         /* atoms */
 422         for (an = 0; an < (int) N_ATOM; an++) {
 423                 if (ao_scheme_has_feature(enable, atoms[an].feature) || !ao_scheme_has_feature(disable, atoms[an].feature))
 424                         a = ao_scheme_atom_intern((char *) atoms[an].name);
 425         }
 426
 427         if (argv[optind]){
 428                 in = fopen(argv[optind], "r");
 429                 if (!in) {
 430                         perror(argv[optind]);
 431                         exit(1);
 432                 }
 433         }
 434         if (!ao_scheme_read_eval_abort()) {
 435                 fprintf(stderr, "eval failed\n");
 436                 exit(1);
 437         }
 438
 439         /* Reduce to referenced values */
 440         ao_scheme_collect(AO_SCHEME_COLLECT_FULL);
 441
 442         for (f = 0; f < ao_scheme_frame_global->num; f++) {
 443                 struct ao_scheme_frame_vals     *vals = ao_scheme_poly_frame_vals(ao_scheme_frame_global->vals);
 444
 445                 val = ao_has_macro(vals->vals[f].val);
 446                 if (val != AO_SCHEME_NIL) {
 447                         printf("error: function %s contains unresolved macro: ",
 448                                ao_scheme_poly_atom(vals->vals[f].atom)->name);
 449                         ao_scheme_poly_write(val, true);
 450                         printf("\n");
 451                         exit(1);
 452                 }
 453
 454                 /* Remap builtin enum values to match target set */
 455                 b = ao_scheme_get_builtin(vals->vals[f].val);
 456                 if (b != NULL) {
 457                         if (!ao_scheme_seen_builtin(b))
 458                                 b->func = func_map[b->func];
 459                 }
 460         }
 461
 462         if (out_name) {
 463                 out = fopen(out_name, "w");
 464                 if (!out) {
 465                         perror(out_name);
 466                         exit(1);
 467                 }
 468         }
 469
 470         fprintf(out, "/* Generated file, do not edit */\n\n");
 471
 472         for (d = disable; d; d = d->next)
 473                 fprintf(out, "#undef AO_SCHEME_FEATURE_%s\n", d->name);
 474
 475         fprintf(out, "#define AO_SCHEME_POOL_CONST %d\n", ao_scheme_top);
 476         fprintf(out, "extern const uint8_t ao_scheme_const[AO_SCHEME_POOL_CONST] __attribute__((aligned(4)));\n");
 477         fprintf(out, "#define ao_builtin_atoms 0x%04x\n", ao_scheme_atom_poly(ao_scheme_atoms));
 478         fprintf(out, "#define ao_builtin_frame 0x%04x\n", ao_scheme_frame_poly(ao_scheme_frame_global));
 479         fprintf(out, "#define ao_scheme_const_checksum ((uint16_t) 0x%04x)\n", ao_fec_crc(ao_scheme_const, ao_scheme_top));
 480
 481         fprintf(out, "#define _ao_scheme_bool_false 0x%04x\n", ao_scheme_bool_poly(ao_scheme_false));
 482         fprintf(out, "#define _ao_scheme_bool_true 0x%04x\n", ao_scheme_bool_poly(ao_scheme_true));
 483
 484         for (a = ao_scheme_atoms; a; a = ao_scheme_poly_atom(a->next)) {
 485                 const char      *n = a->name;
 486                 char            ch;
 487                 fprintf(out, "#define _ao_scheme_atom_");
 488                 while ((ch = *n++)) {
 489                         if (isalnum(ch))
 490                                 fprintf(out, "%c", ch);
 491                         else
 492                                 fprintf(out, "%02x", ch);
 493                 }
 494                 fprintf(out, "  0x%04x\n", ao_scheme_atom_poly(a));
 495         }
 496         fprintf(out, "#ifdef AO_SCHEME_CONST_BITS\n");
 497         fprintf(out, "const uint8_t ao_scheme_const[AO_SCHEME_POOL_CONST] __attribute((aligned(4))) = {");
 498         for (o = 0; o < ao_scheme_top; o++) {
 499                 uint8_t ch;
 500                 if ((o & 0xf) == 0)
 501                         fprintf(out, "\n\t");
 502                 else
 503                         fprintf(out, " ");
 504                 ch = ao_scheme_const[o];
 505                 if (!in_atom)
 506                         in_atom = is_atom(o);
 507                 if (in_atom) {
 508                         fprintf(out, " '%c',", ch);
 509                         in_atom--;
 510                 } else {
 511                         fprintf(out, "0x%02x,", ch);
 512                 }
 513         }
 514         fprintf(out, "\n};\n");
 515         fprintf(out, "#endif /* AO_SCHEME_CONST_BITS */\n");
 516         exit(0);
 517 }