ncc.c

   1 /*
   2  * neatcc - A small and simple x86_64 C compiler
   3  *
   4  * Copyright (C) 2010 Ali Gholami Rudi
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License, as published by the
   8  * Free Software Foundation.
   9  */
  10 #include <fcntl.h>
  11 #include <unistd.h>
  12 #include <stdlib.h>
  13 #include <string.h>
  14 #include <sys/stat.h>
  15 #include <sys/types.h>
  16 #include "gen.h"
  17 #include "tok.h"
  18
  19 #define MAXLOCALS       (1 << 10)
  20 #define MAXGLOBALS      (1 << 10)
  21 #define MAXARGS         (1 << 5)
  22 #define print(s)        write(2, (s), strlen(s));
  23
  24 #define TYPE_BT(t)              ((t)->ptr ? 8 : (t)->bt)
  25 #define TYPE_SZ(t)              ((t)->ptr ? 8 : (t)->bt & BT_SZMASK)
  26
  27 #define T_ARRAY         0x01
  28 #define T_STRUCT        0x02
  29 #define T_FUNC          0x04
  30
  31 #define F_INIT          0x01
  32 #define F_STATIC        0x02
  33 #define F_EXTERN        0x04
  34
  35 struct type {
  36         unsigned bt;
  37         unsigned flags;
  38         int ptr;
  39         int id;         /* for structs, functions and arrays */
  40 };
  41
  42 /* type stack */
  43 static struct type ts[MAXTMP];
  44 static int nts;
  45
  46 static void ts_push_bt(unsigned bt)
  47 {
  48         ts[nts].ptr = 0;
  49         ts[nts].flags = 0;
  50         ts[nts++].bt = bt;
  51 }
  52
  53 static void ts_push(struct type *t)
  54 {
  55         memcpy(&ts[nts++], t, sizeof(*t));
  56         if (t->flags & (T_FUNC | T_ARRAY) && !t->ptr)
  57                 o_addr();
  58 }
  59
  60 static void ts_pop(struct type *type)
  61 {
  62         nts--;
  63         if (type)
  64                 *type = ts[nts];
  65 }
  66
  67 void die(char *msg)
  68 {
  69         print(msg);
  70         exit(1);
  71 }
  72
  73 void err(char *msg)
  74 {
  75         char err[1 << 7];
  76         int len = cpp_loc(err, tok_addr());
  77         strcpy(err + len, msg);
  78         die(err);
  79 }
  80
  81 struct name {
  82         char name[NAMELEN];
  83         struct type type;
  84         long addr;
  85         int unused;             /* unreferenced external symbols */
  86 };
  87
  88 static struct name locals[MAXLOCALS];
  89 static int nlocals;
  90 static struct name globals[MAXGLOBALS];
  91 static int nglobals;
  92
  93 static void local_add(struct name *name)
  94 {
  95         if (nlocals >= MAXLOCALS)
  96                 err("nomem: MAXLOCALS reached!\n");
  97         memcpy(&locals[nlocals++], name, sizeof(*name));
  98 }
  99
 100 static int global_find(char *name)
 101 {
 102         int i;
 103         for (i = 0; i < nglobals; i++)
 104                 if (!strcmp(name, globals[i].name))
 105                         return i;
 106         return -1;
 107 }
 108
 109 static void global_add(struct name *name)
 110 {
 111         int found = global_find(name->name);
 112         int i = found == -1 ? nglobals++ : found;
 113         if (nglobals >= MAXGLOBALS)
 114                 err("nomem: MAXGLOBALS reached!\n");
 115         memcpy(&globals[i], name, sizeof(*name));
 116 }
 117
 118 #define MAXENUMS                (1 << 10)
 119
 120 static struct enumval {
 121         char name[NAMELEN];
 122         int n;
 123 } enums[MAXENUMS];
 124 static int nenums;
 125
 126 static void enum_add(char *name, int val)
 127 {
 128         struct enumval *ev = &enums[nenums++];
 129         if (nenums >= MAXENUMS)
 130                 err("nomem: MAXENUMS reached!\n");
 131         strcpy(ev->name, name);
 132         ev->n = val;
 133 }
 134
 135 static int enum_find(int *val, char *name)
 136 {
 137         int i;
 138         for (i = nenums - 1; i >= 0; --i)
 139                 if (!strcmp(name, enums[i].name)) {
 140                         *val = enums[i].n;
 141                         return 0;
 142                 }
 143         return 1;
 144 }
 145
 146 #define MAXTYPEDEFS             (1 << 10)
 147
 148 static struct typdefinfo {
 149         char name[NAMELEN];
 150         struct type type;
 151 } typedefs[MAXTYPEDEFS];
 152 static int ntypedefs;
 153
 154 static void typedef_add(char *name, struct type *type)
 155 {
 156         struct typdefinfo *ti = &typedefs[ntypedefs++];
 157         if (ntypedefs >= MAXTYPEDEFS)
 158                 err("nomem: MAXTYPEDEFS reached!\n");
 159         strcpy(ti->name, name);
 160         memcpy(&ti->type, type, sizeof(*type));
 161 }
 162
 163 static int typedef_find(char *name)
 164 {
 165         int i;
 166         for (i = ntypedefs - 1; i >= 0; --i)
 167                 if (!strcmp(name, typedefs[i].name))
 168                         return i;
 169         return -1;
 170 }
 171
 172 #define MAXARRAYS               (1 << 10)
 173
 174 static struct array {
 175         struct type type;
 176         int n;
 177 } arrays[MAXARRAYS];
 178 static int narrays;
 179
 180 static int array_add(struct type *type, int n)
 181 {
 182         struct array *a = &arrays[narrays++];
 183         if (narrays >= MAXARRAYS)
 184                 err("nomem: MAXARRAYS reached!\n");
 185         memcpy(&a->type, type, sizeof(*type));
 186         a->n = n;
 187         return a - arrays;
 188 }
 189
 190 static void array2ptr(struct type *t)
 191 {
 192         if (!(t->flags & T_ARRAY) || t->ptr)
 193                 return;
 194         memcpy(t, &arrays[t->id].type, sizeof(*t));
 195         t->ptr++;
 196 }
 197
 198 #define MAXSTRUCTS              (1 << 10)
 199 #define MAXFIELDS               (1 << 7)
 200
 201 static struct structinfo {
 202         char name[NAMELEN];
 203         struct name fields[MAXFIELDS];
 204         int nfields;
 205         int isunion;
 206         int size;
 207 } structs[MAXSTRUCTS];
 208 static int nstructs;
 209
 210 static int struct_find(char *name, int isunion)
 211 {
 212         int i;
 213         for (i = nstructs - 1; i >= 0; --i)
 214                 if (*structs[i].name && !strcmp(name, structs[i].name) &&
 215                                 structs[i].isunion == isunion)
 216                         return i;
 217         i = nstructs++;
 218         if (nstructs >= MAXSTRUCTS)
 219                 err("nomem: MAXTYPES reached!\n");
 220         memset(&structs[i], 0, sizeof(structs[i]));
 221         strcpy(structs[i].name, name);
 222         structs[i].isunion = isunion;
 223         return i;
 224 }
 225
 226 static struct name *struct_field(int id, char *name)
 227 {
 228         struct structinfo *si = &structs[id];
 229         int i;
 230         for (i = 0; i < si->nfields; i++)
 231                 if (!strcmp(name, si->fields[i].name))
 232                         return &si->fields[i];
 233         err("field not found\n");
 234 }
 235
 236 #define MAXBREAK                (1 << 7)
 237
 238 static long breaks[MAXBREAK];
 239 static int nbreaks;
 240 static long continues[MAXBREAK];
 241 static int ncontinues;
 242
 243 static void break_fill(long addr, int till)
 244 {
 245         int i;
 246         for (i = till; i < nbreaks; i++)
 247                 o_filljmp2(breaks[i], addr);
 248         nbreaks = till;
 249 }
 250
 251 static void continue_fill(long addr, int till)
 252 {
 253         int i;
 254         for (i = till; i < ncontinues; i++)
 255                 o_filljmp2(continues[i], addr);
 256         ncontinues = till;
 257 }
 258
 259 static int type_totsz(struct type *t)
 260 {
 261         if (t->ptr)
 262                 return 8;
 263         if (t->flags & T_ARRAY)
 264                 return arrays[t->id].n * type_totsz(&arrays[t->id].type);
 265         return t->flags & T_STRUCT ? structs[t->id].size : BT_SZ(t->bt);
 266 }
 267
 268 static unsigned type_szde(struct type *t)
 269 {
 270         struct type de = *t;
 271         array2ptr(&de);
 272         de.ptr--;
 273         return type_totsz(&de);
 274 }
 275
 276 static int tok_jmp(int tok)
 277 {
 278         if (tok_see() != tok)
 279                 return 1;
 280         tok_get();
 281         return 0;
 282 }
 283
 284 static void tok_expect(int tok)
 285 {
 286         if (tok_get() != tok)
 287                 err("syntax error\n");
 288 }
 289
 290 static unsigned bt_op(unsigned bt1, unsigned bt2)
 291 {
 292         unsigned s1 = BT_SZ(bt1);
 293         unsigned s2 = BT_SZ(bt2);
 294         return (bt1 | bt2) & BT_SIGNED | (s1 > s2 ? s1 : s2);
 295 }
 296
 297 static void ts_binop(void (*o_sth)(void))
 298 {
 299         struct type t1, t2;
 300         ts_pop(&t1);
 301         ts_pop(&t2);
 302         o_sth();
 303         ts_push_bt(bt_op(TYPE_BT(&t1), TYPE_BT(&t2)));
 304 }
 305
 306 static void ts_binop_add(void (*o_sth)(void))
 307 {
 308         struct type t1, t2;
 309         ts_pop(&t1);
 310         ts_pop(&t2);
 311         array2ptr(&t1);
 312         array2ptr(&t2);
 313         if (!t1.ptr && !t2.ptr) {
 314                 o_sth();
 315                 ts_push_bt(bt_op(TYPE_BT(&t1), TYPE_BT(&t2)));
 316                 return;
 317         }
 318         if (t1.ptr && !t2.ptr) {
 319                 struct type t = t2;
 320                 t2 = t1;
 321                 t1 = t;
 322                 o_tmpswap();
 323         }
 324         if (!t1.ptr && t2.ptr)
 325                 if (type_szde(&t2) > 1) {
 326                         o_num(type_szde(&t2), 4);
 327                         o_mul();
 328                 }
 329         o_sth();
 330         if (t1.ptr && t2.ptr) {
 331                 int sz = type_szde(&t1);
 332                 if (sz > 1) {
 333                         o_num(sz, 4);
 334                         o_div();
 335                 }
 336                 ts_push_bt(4 | BT_SIGNED);
 337         } else {
 338                 ts_push(&t2);
 339         }
 340 }
 341
 342 #define ALIGN(x, a)             (((x) + (a) - 1) & ~((a) - 1))
 343 #define MIN(a, b)               ((a) < (b) ? (a) : (b))
 344
 345 static int type_alignment(struct type *t)
 346 {
 347         if (t->flags & T_ARRAY && !t->ptr)
 348                 return type_alignment(&arrays[t->id].type);
 349         if (t->flags & T_STRUCT && !t->ptr)
 350                 return type_alignment(&structs[t->id].fields[0].type);
 351         return MIN(8, type_totsz(t));
 352 }
 353
 354 static void structdef(void *data, struct name *name, unsigned flags)
 355 {
 356         struct structinfo *si = data;
 357         if (si->isunion) {
 358                 name->addr = 0;
 359                 if (si->size < type_totsz(&name->type))
 360                         si->size = type_totsz(&name->type);
 361         } else {
 362                 struct type *t = &name->type;
 363                 int alignment = type_alignment(t);
 364                 if (t->flags & T_ARRAY && !t->ptr)
 365                         alignment = MIN(8, type_totsz(&arrays[t->id].type));
 366                 si->size = ALIGN(si->size, alignment);
 367                 name->addr = si->size;
 368                 si->size += type_totsz(&name->type);
 369         }
 370         memcpy(&si->fields[si->nfields++], name, sizeof(*name));
 371 }
 372
 373 static int readdefs(void (*def)(void *, struct name *, unsigned f), void *data);
 374
 375 static int struct_create(char *name, int isunion)
 376 {
 377         int id = struct_find(name, isunion);
 378         struct structinfo *si = &structs[id];
 379         tok_expect('{');
 380         while (tok_jmp('}')) {
 381                 readdefs(structdef, si);
 382                 tok_expect(';');
 383         }
 384         return id;
 385 }
 386
 387 static void readexpr(void);
 388
 389 static void enum_create(void)
 390 {
 391         long n = 0;
 392         tok_expect('{');
 393         while (tok_jmp('}')) {
 394                 char name[NAMELEN];
 395                 tok_expect(TOK_NAME);
 396                 strcpy(name, tok_id());
 397                 if (tok_see() == '=') {
 398                         tok_get();
 399                         readexpr();
 400                         ts_pop(NULL);
 401                         if (o_popnum(&n))
 402                                 err("const expr expected!\n");
 403                 }
 404                 enum_add(name, n++);
 405                 tok_jmp(',');
 406         }
 407 }
 408
 409 static int basetype(struct type *type, unsigned *flags)
 410 {
 411         int sign = 1;
 412         int size = 4;
 413         int done = 0;
 414         int i = 0;
 415         int isunion;
 416         char name[NAMELEN] = "";
 417         *flags = 0;
 418         type->flags = 0;
 419         type->ptr = 0;
 420         while (!done) {
 421                 switch (tok_see()) {
 422                 case TOK_STATIC:
 423                         *flags |= F_STATIC;
 424                         break;
 425                 case TOK_EXTERN:
 426                         *flags |= F_EXTERN;
 427                         break;
 428                 case TOK_VOID:
 429                         sign = 0;
 430                         size = 0;
 431                         done = 1;
 432                         break;
 433                 case TOK_INT:
 434                         done = 1;
 435                         break;
 436                 case TOK_CHAR:
 437                         size = 1;
 438                         done = 1;
 439                         break;
 440                 case TOK_SHORT:
 441                         size = 2;
 442                         break;
 443                 case TOK_LONG:
 444                         size = 8;
 445                         break;
 446                 case TOK_SIGNED:
 447                         break;
 448                 case TOK_UNSIGNED:
 449                         sign = 0;
 450                         break;
 451                 case TOK_UNION:
 452                 case TOK_STRUCT:
 453                         isunion = tok_get() == TOK_UNION;
 454                         if (!tok_jmp(TOK_NAME))
 455                                 strcpy(name, tok_id());
 456                         if (tok_see() == '{')
 457                                 type->id = struct_create(name, isunion);
 458                         else
 459                                 type->id = struct_find(name, isunion);
 460                         type->flags |= T_STRUCT;
 461                         type->bt = 8;
 462                         return 0;
 463                 case TOK_ENUM:
 464                         tok_get();
 465                         tok_jmp(TOK_NAME);
 466                         if (tok_see() == '{')
 467                                 enum_create();
 468                         type->bt = 4 | BT_SIGNED;
 469                         return 0;
 470                 default:
 471                         if (tok_see() == TOK_NAME) {
 472                                 int id = typedef_find(tok_id());
 473                                 if (id != -1) {
 474                                         tok_get();
 475                                         memcpy(type, &typedefs[id].type,
 476                                                 sizeof(*type));
 477                                         return 0;
 478                                 }
 479                         }
 480                         if (!i)
 481                                 return 1;
 482                         done = 1;
 483                         continue;
 484                 }
 485                 i++;
 486                 tok_get();
 487         }
 488         type->bt = size | (sign ? BT_SIGNED : 0);
 489         return 0;
 490 }
 491
 492 static int readname(struct type *main, char *name,
 493                         struct type *base, unsigned flags);
 494
 495 static int readtype(struct type *type)
 496 {
 497         return readname(type, NULL, NULL, 0);
 498 }
 499
 500 static void readptrs(struct type *type)
 501 {
 502         while (!tok_jmp('*')) {
 503                 type->ptr++;
 504                 if (!type->bt)
 505                         type->bt = 1;
 506         }
 507 }
 508
 509 /* used to differenciate labels from case and cond exprs */
 510 static int ncexpr;
 511 static int caseexpr;
 512
 513 static void readpre(void);
 514
 515 static void readprimary(void)
 516 {
 517         int i;
 518         if (!tok_jmp(TOK_NUM)) {
 519                 long n;
 520                 int bt = tok_num(&n);
 521                 ts_push_bt(bt);
 522                 o_num(n, bt);
 523                 return;
 524         }
 525         if (!tok_jmp(TOK_STR)) {
 526                 struct type t;
 527                 char buf[BUFSIZE];
 528                 int len;
 529                 t.bt = 1 | BT_SIGNED;
 530                 t.ptr = 1;
 531                 t.flags = 0;
 532                 ts_push(&t);
 533                 len = tok_str(buf);
 534                 o_symaddr(out_mkdat(NULL, buf, len, 0), TYPE_BT(&t));
 535                 o_addr();
 536                 return;
 537         }
 538         if (!tok_jmp(TOK_NAME)) {
 539                 struct name unkn = {0};
 540                 char *name = unkn.name;
 541                 int n;
 542                 strcpy(name, tok_id());
 543                 /* don't search for labels here */
 544                 if (!ncexpr && !caseexpr && tok_see() == ':')
 545                         return;
 546                 for (i = nlocals - 1; i >= 0; --i) {
 547                         struct type *t = &locals[i].type;
 548                         if (!strcmp(locals[i].name, name)) {
 549                                 o_local(locals[i].addr, TYPE_BT(t));
 550                                 ts_push(t);
 551                                 return;
 552                         }
 553                 }
 554                 if ((n = global_find(name)) != -1) {
 555                         struct name *g = &globals[n];
 556                         struct type *t = &g->type;
 557                         if (g->unused) {
 558                                 g->unused = 0;
 559                                 if (t->flags & T_FUNC && !t->ptr)
 560                                         g->addr = out_mkundef(name, 0);
 561                                 else
 562                                         g->addr = out_mkundef(name, type_totsz(t));
 563                         }
 564                         o_symaddr(g->addr, TYPE_BT(t));
 565                         ts_push(t);
 566                         return;
 567                 }
 568                 if (!enum_find(&n, name)) {
 569                         ts_push_bt(4 | BT_SIGNED);
 570                         o_num(n, 4 | BT_SIGNED);
 571                         return;
 572                 }
 573                 if (tok_see() != '(')
 574                         err("unknown symbol\n");
 575                 unkn.addr = out_mkundef(unkn.name, 0);
 576                 global_add(&unkn);
 577                 ts_push_bt(8);
 578                 o_symaddr(unkn.addr, 8);
 579                 return;
 580         }
 581         if (!tok_jmp('(')) {
 582                 struct type t;
 583                 if (!readtype(&t)) {
 584                         struct type o;
 585                         tok_expect(')');
 586                         readpre();
 587                         ts_pop(&o);
 588                         ts_push(&t);
 589                         if (!t.ptr || !o.ptr)
 590                                 o_cast(TYPE_BT(&t));
 591                 } else {
 592                         readexpr();
 593                         tok_expect(')');
 594                 }
 595                 return;
 596         }
 597 }
 598
 599 void arrayderef(struct type *t)
 600 {
 601         int sz = type_totsz(t);
 602         if (sz > 1) {
 603                 o_num(sz, 4);
 604                 o_mul();
 605         }
 606         o_add();
 607         o_deref(TYPE_BT(t));
 608 }
 609
 610 static void inc_post(void (*op)(void))
 611 {
 612         unsigned bt = TYPE_BT(&ts[nts - 1]);
 613         o_tmpcopy();
 614         o_load();
 615         o_tmpswap();
 616         o_tmpcopy();
 617         o_num(1, 4);
 618         ts_push_bt(bt);
 619         ts_push_bt(bt);
 620         ts_binop_add(op);
 621         ts_pop(NULL);
 622         o_assign(bt);
 623         o_tmpdrop(1);
 624 }
 625
 626 static void readfield(void)
 627 {
 628         struct name *field;
 629         struct type t;
 630         tok_expect(TOK_NAME);
 631         ts_pop(&t);
 632         array2ptr(&t);
 633         field = struct_field(t.id, tok_id());
 634         if (field->addr) {
 635                 o_num(field->addr, 4);
 636                 o_add();
 637         }
 638         o_deref(TYPE_BT(&field->type));
 639         ts_push(&field->type);
 640 }
 641
 642 #define MAXFUNCS                (1 << 10)
 643
 644 static struct funcinfo {
 645         struct type args[MAXFIELDS];
 646         struct type ret;
 647         int nargs;
 648 } funcs[MAXFUNCS];
 649 static int nfuncs;
 650 static unsigned ret_bt;
 651
 652 static int func_create(struct type *ret, struct name *args, int nargs)
 653 {
 654         struct funcinfo *fi = &funcs[nfuncs++];
 655         int i;
 656         if (nfuncs >= MAXFUNCS)
 657                 err("nomem: MAXFUNCS reached!\n");
 658         memcpy(&fi->ret, ret, sizeof(*ret));
 659         for (i = 0; i < nargs; i++)
 660                 memcpy(&fi->args[i], &args[i].type, sizeof(*ret));
 661         fi->nargs = nargs;
 662         return fi - funcs;
 663 }
 664
 665 static void readcall(void)
 666 {
 667         struct type t;
 668         unsigned bt[MAXARGS];
 669         struct funcinfo *fi;
 670         int argc = 0;
 671         int i;
 672         ts_pop(&t);
 673         if (t.flags & T_FUNC && t.ptr > 0)
 674                 o_deref(8);
 675         fi = t.flags & T_FUNC ? &funcs[t.id] : NULL;
 676         if (tok_see() != ')') {
 677                 readexpr();
 678                 ts_pop(&t);
 679                 bt[argc++] = TYPE_BT(&t);
 680         }
 681         while (!tok_jmp(',')) {
 682                 readexpr();
 683                 ts_pop(&t);
 684                 bt[argc++] = TYPE_BT(&t);
 685         }
 686         tok_expect(')');
 687         if (fi)
 688                 for (i = 0; i < fi->nargs; i++)
 689                         bt[i] = TYPE_BT(&fi->args[i]);
 690         o_call(argc, bt, fi ? TYPE_BT(&fi->ret) : 4 | BT_SIGNED);
 691         if (fi)
 692                 ts_push(&fi->ret);
 693         else
 694                 ts_push_bt(4 | BT_SIGNED);
 695 }
 696
 697 static void readpost(void)
 698 {
 699         readprimary();
 700         while (1) {
 701                 if (!tok_jmp('[')) {
 702                         struct type t;
 703                         ts_pop(&t);
 704                         readexpr();
 705                         ts_pop(NULL);
 706                         tok_expect(']');
 707                         array2ptr(&t);
 708                         t.ptr--;
 709                         arrayderef(&t);
 710                         ts_push(&t);
 711                         continue;
 712                 }
 713                 if (!tok_jmp('(')) {
 714                         readcall();
 715                         continue;
 716                 }
 717                 if (!tok_jmp(TOK2("++"))) {
 718                         inc_post(o_add);
 719                         continue;
 720                 }
 721                 if (!tok_jmp(TOK2("--"))) {
 722                         inc_post(o_sub);
 723                         continue;
 724                 }
 725                 if (!tok_jmp('.')) {
 726                         o_addr();
 727                         readfield();
 728                         continue;
 729                 }
 730                 if (!tok_jmp(TOK2("->"))) {
 731                         readfield();
 732                         continue;
 733                 }
 734                 break;
 735         }
 736 }
 737
 738 static void inc_pre(void (*op)(void))
 739 {
 740         unsigned bt;
 741         readpre();
 742         bt = TYPE_BT(&ts[nts - 1]);
 743         o_tmpcopy();
 744         o_num(1, 4);
 745         ts_push_bt(bt);
 746         ts_push_bt(bt);
 747         ts_binop_add(op);
 748         ts_pop(NULL);
 749         o_assign(bt);
 750 }
 751
 752 static void readpre(void)
 753 {
 754         if (!tok_jmp('&')) {
 755                 struct type type;
 756                 readpre();
 757                 ts_pop(&type);
 758                 if (!(type.flags & T_FUNC) && !type.ptr)
 759                         type.ptr++;
 760                 ts_push(&type);
 761                 o_addr();
 762                 return;
 763         }
 764         if (!tok_jmp('*')) {
 765                 struct type t;
 766                 readpre();
 767                 ts_pop(&t);
 768                 array2ptr(&t);
 769                 if (!(t.flags & T_FUNC) || t.ptr > 0) {
 770                         t.ptr--;
 771                         o_deref(TYPE_BT(&t));
 772                 }
 773                 ts_push(&t);
 774                 return;
 775         }
 776         if (!tok_jmp('!')) {
 777                 struct type type;
 778                 readpre();
 779                 ts_pop(&type);
 780                 o_lnot();
 781                 ts_push_bt(4 | BT_SIGNED);
 782                 return;
 783         }
 784         if (!tok_jmp('-')) {
 785                 readpre();
 786                 o_neg();
 787                 return;
 788         }
 789         if (!tok_jmp('~')) {
 790                 readpre();
 791                 o_not();
 792                 return;
 793         }
 794         if (!tok_jmp(TOK2("++"))) {
 795                 inc_pre(o_add);
 796                 return;
 797         }
 798         if (!tok_jmp(TOK2("--"))) {
 799                 inc_pre(o_sub);
 800                 return;
 801         }
 802         if (!tok_jmp(TOK_SIZEOF)) {
 803                 struct type t;
 804                 int op = !tok_jmp('(');
 805                 if (readtype(&t)) {
 806                         int nogen = !o_nogen();
 807                         readexpr();
 808                         if (nogen)
 809                                 o_dogen();
 810                         ts_pop(&t);
 811                         o_tmpdrop(1);
 812                 }
 813                 ts_push_bt(4);
 814                 o_num(type_totsz(&t), 4);
 815                 if (op)
 816                         tok_expect(')');
 817                 return;
 818         }
 819         readpost();
 820 }
 821
 822 static void readmul(void)
 823 {
 824         readpre();
 825         while (1) {
 826                 if (!tok_jmp('*')) {
 827                         readpre();
 828                         ts_binop(o_mul);
 829                         continue;
 830                 }
 831                 if (!tok_jmp('/')) {
 832                         readpre();
 833                         ts_binop(o_div);
 834                         continue;
 835                 }
 836                 if (!tok_jmp('%')) {
 837                         readpre();
 838                         ts_binop(o_mod);
 839                         continue;
 840                 }
 841                 break;
 842         }
 843 }
 844
 845 static void readadd(void)
 846 {
 847         readmul();
 848         while (1) {
 849                 if (!tok_jmp('+')) {
 850                         readmul();
 851                         ts_binop_add(o_add);
 852                         continue;
 853                 }
 854                 if (!tok_jmp('-')) {
 855                         readmul();
 856                         ts_binop_add(o_sub);
 857                         continue;
 858                 }
 859                 break;
 860         }
 861 }
 862
 863 static void shift(void (*op)(void))
 864 {
 865         struct type t;
 866         readadd();
 867         ts_pop(NULL);
 868         ts_pop(&t);
 869         op();
 870         ts_push_bt(TYPE_BT(&t));
 871 }
 872
 873 static void readshift(void)
 874 {
 875         readadd();
 876         while (1) {
 877                 if (!tok_jmp(TOK2("<<"))) {
 878                         shift(o_shl);
 879                         continue;
 880                 }
 881                 if (!tok_jmp(TOK2(">>"))) {
 882                         shift(o_shr);
 883                         continue;
 884                 }
 885                 break;
 886         }
 887 }
 888
 889 static void cmp(void (*op)(void))
 890 {
 891         readshift();
 892         ts_pop(NULL);
 893         ts_pop(NULL);
 894         op();
 895         ts_push_bt(4 | BT_SIGNED);
 896 }
 897
 898 static void readcmp(void)
 899 {
 900         readshift();
 901         while (1) {
 902                 if (!tok_jmp('<')) {
 903                         cmp(o_lt);
 904                         continue;
 905                 }
 906                 if (!tok_jmp('>')) {
 907                         cmp(o_gt);
 908                         continue;
 909                 }
 910                 if (!tok_jmp(TOK2("<="))) {
 911                         cmp(o_le);
 912                         continue;
 913                 }
 914                 if (!tok_jmp(TOK2(">="))) {
 915                         cmp(o_ge);
 916                         continue;
 917                 }
 918                 break;
 919         }
 920 }
 921
 922 static void eq(void (*op)(void))
 923 {
 924         readcmp();
 925         ts_pop(NULL);
 926         ts_pop(NULL);
 927         op();
 928         ts_push_bt(4 | BT_SIGNED);
 929 }
 930
 931 static void readeq(void)
 932 {
 933         readcmp();
 934         while (1) {
 935                 if (!tok_jmp(TOK2("=="))) {
 936                         eq(o_eq);
 937                         continue;
 938                 }
 939                 if (!tok_jmp(TOK2("!="))) {
 940                         eq(o_neq);
 941                         continue;
 942                 }
 943                 break;
 944         }
 945 }
 946
 947 static void readbitand(void)
 948 {
 949         readeq();
 950         while (!tok_jmp('&')) {
 951                 readeq();
 952                 ts_binop(o_and);
 953         }
 954 }
 955
 956 static void readxor(void)
 957 {
 958         readbitand();
 959         while (!tok_jmp('^')) {
 960                 readbitand();
 961                 ts_binop(o_xor);
 962         }
 963 }
 964
 965 static void readbitor(void)
 966 {
 967         readxor();
 968         while (!tok_jmp('|')) {
 969                 readxor();
 970                 ts_binop(o_or);
 971         }
 972 }
 973
 974 #define MAXCOND                 (1 << 7)
 975
 976 static void readand(void)
 977 {
 978         long conds[MAXCOND];
 979         int nconds = 0;
 980         long passed;
 981         int i;
 982         readbitor();
 983         if (tok_see() != TOK2("&&"))
 984                 return;
 985         o_fork();
 986         conds[nconds++] = o_jz(0);
 987         ts_pop(NULL);
 988         while (!tok_jmp(TOK2("&&"))) {
 989                 readbitor();
 990                 conds[nconds++] = o_jz(0);
 991                 ts_pop(NULL);
 992         }
 993         o_num(1, 4 | BT_SIGNED);
 994         o_forkpush();
 995         passed = o_jmp(0);
 996         for (i = 0; i < nconds; i++)
 997                 o_filljmp(conds[i]);
 998         o_num(0, 4 | BT_SIGNED);
 999         o_forkpush();
1000         o_forkjoin();
1001         o_filljmp(passed);
1002         ts_push_bt(4 | BT_SIGNED);
1003 }
1004
1005 static void reador(void)
1006 {
1007         long conds[MAXCOND];
1008         int nconds = 0;
1009         long failed;
1010         int i;
1011         readand();
1012         if (tok_see() != TOK2("||"))
1013                 return;
1014         o_fork();
1015         conds[nconds++] = o_jnz(0);
1016         ts_pop(NULL);
1017         while (!tok_jmp(TOK2("||"))) {
1018                 readand();
1019                 conds[nconds++] = o_jnz(0);
1020                 ts_pop(NULL);
1021         }
1022         o_num(0, 4 | BT_SIGNED);
1023         o_forkpush();
1024         failed = o_jmp(0);
1025         for (i = 0; i < nconds; i++)
1026                 o_filljmp(conds[i]);
1027         o_num(1, 4 | BT_SIGNED);
1028         o_forkpush();
1029         o_forkjoin();
1030         o_filljmp(failed);
1031         ts_push_bt(4 | BT_SIGNED);
1032 }
1033
1034 static int readcexpr_const(void)
1035 {
1036         long c;
1037         int nogen;
1038         if (o_popnum(&c))
1039                 return -1;
1040         if (!c)
1041                 nogen = !o_nogen();
1042         reador();
1043         ts_pop(NULL);
1044         tok_expect(':');
1045         if (c) {
1046                 nogen = !o_nogen();
1047         } else {
1048                 if (nogen)
1049                         o_dogen();
1050                 o_tmpdrop(1);
1051         }
1052         reador();
1053         if (c) {
1054                 if (nogen)
1055                         o_dogen();
1056                 o_tmpdrop(1);
1057         }
1058         return 0;
1059 }
1060
1061 static void readcexpr(void)
1062 {
1063         long l1, l2;
1064         reador();
1065         if (tok_jmp('?'))
1066                 return;
1067         ncexpr++;
1068         ts_pop(NULL);
1069         o_fork();
1070         if (readcexpr_const()) {
1071                 l1 = o_jz(0);
1072                 reador();
1073                 o_forkpush();
1074                 l2 = o_jmp(0);
1075                 ts_pop(NULL);
1076
1077                 tok_expect(':');
1078                 o_filljmp(l1);
1079                 reador();
1080                 o_forkpush();
1081                 o_forkjoin();
1082                 o_filljmp(l2);
1083         }
1084         ncexpr--;
1085 }
1086
1087 static void opassign(void (*bop)(void (*op)(void)), void (*op)(void))
1088 {
1089         unsigned bt = TYPE_BT(&ts[nts - 1]);
1090         o_tmpcopy();
1091         readexpr();
1092         bop(op);
1093         ts_pop(NULL);
1094         o_assign(bt);
1095 }
1096
1097 static void doassign(void)
1098 {
1099         struct type t;
1100         ts_pop(&t);
1101         if (!t.ptr && t.flags & T_STRUCT)
1102                 o_memcpy(type_totsz(&t));
1103         else
1104                 o_assign(TYPE_BT(&ts[nts - 1]));
1105 }
1106
1107 static void readexpr(void)
1108 {
1109         readcexpr();
1110         if (!tok_jmp('=')) {
1111                 readexpr();
1112                 doassign();
1113                 return;
1114         }
1115         if (!tok_jmp(TOK2("+="))) {
1116                 opassign(ts_binop_add, o_add);
1117                 return;
1118         }
1119         if (!tok_jmp(TOK2("-="))) {
1120                 opassign(ts_binop_add, o_sub);
1121                 return;
1122         }
1123         if (!tok_jmp(TOK2("*="))) {
1124                 opassign(ts_binop, o_mul);
1125                 return;
1126         }
1127         if (!tok_jmp(TOK2("/="))) {
1128                 opassign(ts_binop, o_div);
1129                 return;
1130         }
1131         if (!tok_jmp(TOK2("%="))) {
1132                 opassign(ts_binop, o_mod);
1133                 return;
1134         }
1135         if (!tok_jmp(TOK3("<<="))) {
1136                 opassign(ts_binop, o_shl);
1137                 return;
1138         }
1139         if (!tok_jmp(TOK3(">>="))) {
1140                 opassign(ts_binop, o_shr);
1141                 return;
1142         }
1143         if (!tok_jmp(TOK3("&="))) {
1144                 opassign(ts_binop, o_and);
1145                 return;
1146         }
1147         if (!tok_jmp(TOK3("|="))) {
1148                 opassign(ts_binop, o_or);
1149                 return;
1150         }
1151         if (!tok_jmp(TOK3("^="))) {
1152                 opassign(ts_binop, o_xor);
1153                 return;
1154         }
1155 }
1156
1157 static void readestmt(void)
1158 {
1159         do {
1160                 o_tmpdrop(-1);
1161                 nts = 0;
1162                 readexpr();
1163         } while (!tok_jmp(','));
1164 }
1165
1166 static void o_localoff(long addr, int off, unsigned bt)
1167 {
1168         o_local(addr, bt);
1169         if (off) {
1170                 o_addr();
1171                 o_num(off, 4);
1172                 o_add();
1173                 o_deref(bt);
1174         }
1175 }
1176
1177 static struct type *innertype(struct type *t)
1178 {
1179         if (t->flags & T_ARRAY && !t->ptr)
1180                 return innertype(&arrays[t->id].type);
1181         return t;
1182 }
1183
1184 static void initexpr(struct type *t, int off, void *obj,
1185                 void (*set)(void *obj, int off, struct type *t))
1186 {
1187         if (tok_jmp('{')) {
1188                 set(obj, off, t);
1189                 return;
1190         }
1191         if (!t->ptr && t->flags & T_STRUCT) {
1192                 struct structinfo *si = &structs[t->id];
1193                 int i;
1194                 for (i = 0; i < si->nfields; i++) {
1195                         struct name *field = &si->fields[i];
1196                         if (!tok_jmp('.')) {
1197                                 tok_expect(TOK_NAME);
1198                                 field = struct_field(t->id, tok_id());
1199                                 tok_expect('=');
1200                         }
1201                         initexpr(&field->type, off + field->addr, obj, set);
1202                         if (tok_jmp(',') || tok_see() == '}')
1203                                 break;
1204                 }
1205         } else if (t->flags & T_ARRAY) {
1206                 struct type *t_de = &arrays[t->id].type;
1207                 int i;
1208                 for (i = 0; ; i++) {
1209                         long idx = i;
1210                         struct type *it = t_de;
1211                         if (!tok_jmp('[')) {
1212                                 readexpr();
1213                                 o_popnum(&idx);
1214                                 ts_pop(NULL);
1215                                 tok_expect(']');
1216                                 tok_expect('=');
1217                         }
1218                         if (tok_see() != '{')
1219                                 it = innertype(t_de);
1220                         initexpr(it, off + type_totsz(it) * idx, obj, set);
1221                         if (tok_jmp(',') || tok_see() == '}')
1222                                 break;
1223                 }
1224         }
1225         tok_expect('}');
1226 }
1227
1228 static void jumpbrace(void)
1229 {
1230         int depth = 0;
1231         while (tok_see() != '}' || depth--)
1232                 if (tok_get() == '{')
1233                         depth++;
1234         tok_expect('}');
1235 }
1236
1237 static int initsize(void)
1238 {
1239         long addr = tok_addr();
1240         int n = 0;
1241         if (!tok_jmp(TOK_STR)) {
1242                 n = tok_str(NULL);
1243                 tok_jump(addr);
1244                 return n;
1245         }
1246         o_nogen();
1247         tok_expect('{');
1248         while (tok_jmp('}')) {
1249                 long idx = n;
1250                 if (!tok_jmp('[')) {
1251                         readexpr();
1252                         o_popnum(&idx);
1253                         ts_pop(NULL);
1254                         tok_expect(']');
1255                         tok_expect('=');
1256                 }
1257                 if (n < idx + 1)
1258                         n = idx + 1;
1259                 while (tok_see() != '}' && tok_see() != ',')
1260                         if (tok_get() == '{')
1261                                 jumpbrace();
1262                 tok_jmp(',');
1263         }
1264         o_dogen();
1265         tok_jump(addr);
1266         return n;
1267 }
1268
1269 #define F_GLOBAL(flags)         (!((flags) & F_STATIC))
1270
1271 static void globalinit(void *obj, int off, struct type *t)
1272 {
1273         long addr = *(long *) obj;
1274         if (t->flags & T_ARRAY && tok_see() == TOK_STR) {
1275                 struct type *t_de = &arrays[t->id].type;
1276                 if (!t_de->ptr && !t_de->flags && TYPE_SZ(t_de) == 1) {
1277                         char buf[BUFSIZE];
1278                         int len;
1279                         tok_expect(TOK_STR);
1280                         len = tok_str(buf);
1281                         out_datcpy(addr, off, buf, len);
1282                         return;
1283                 }
1284         }
1285         readexpr();
1286         o_datset(addr, off, TYPE_BT(t));
1287         ts_pop(NULL);
1288 }
1289
1290 static void globaldef(void *data, struct name *name, unsigned flags)
1291 {
1292         struct type *t = &name->type;
1293         char *varname = flags & F_STATIC ? NULL : name->name;
1294         int sz;
1295         if (t->flags & T_ARRAY && !t->ptr && !arrays[t->id].n)
1296                 arrays[t->id].n = initsize();
1297         sz = type_totsz(t);
1298         if (flags & F_EXTERN || t->flags & T_FUNC && !t->ptr)
1299                 name->unused = 1;
1300         else if (flags & F_INIT)
1301                 name->addr = out_mkdat(varname, NULL, sz, F_GLOBAL(flags));
1302         else
1303                 name->addr = out_mkvar(varname, sz, F_GLOBAL(flags));
1304         global_add(name);
1305         if (flags & F_INIT)
1306                 initexpr(t, 0, &name->addr, globalinit);
1307 }
1308
1309 static void localinit(void *obj, int off, struct type *t)
1310 {
1311         long addr = *(long *) obj;
1312         if (t->flags & T_ARRAY && tok_see() == TOK_STR) {
1313                 struct type *t_de = &arrays[t->id].type;
1314                 if (!t_de->ptr && !t_de->flags && TYPE_SZ(t_de) == 1) {
1315                         char buf[BUFSIZE];
1316                         int len;
1317                         tok_expect(TOK_STR);
1318                         len = tok_str(buf);
1319                         o_localoff(addr, off, TYPE_BT(t));
1320                         o_symaddr(out_mkdat(NULL, buf, len, 0), TYPE_BT(t));
1321                         o_memcpy(len);
1322                         o_tmpdrop(1);
1323                         return;
1324                 }
1325         }
1326         o_localoff(addr, off, TYPE_BT(t));
1327         ts_push(t);
1328         readexpr();
1329         doassign();
1330         ts_pop(NULL);
1331         o_tmpdrop(1);
1332 }
1333
1334 static void localdef(void *data, struct name *name, unsigned flags)
1335 {
1336         struct type *t = &name->type;
1337         if (flags & (F_STATIC | F_EXTERN)) {
1338                 globaldef(data, name, flags);
1339                 return;
1340         }
1341         if (t->flags & T_ARRAY && !t->ptr && !arrays[t->id].n)
1342                 arrays[t->id].n = initsize();
1343         name->addr = o_mklocal(type_totsz(&name->type));
1344         local_add(name);
1345         if (flags & F_INIT) {
1346                 if (t->flags & (T_ARRAY | T_STRUCT) && !t->ptr) {
1347                         o_local(name->addr, TYPE_BT(t));
1348                         o_memset(0, type_totsz(t));
1349                         o_tmpdrop(1);
1350                 }
1351                 initexpr(t, 0, &name->addr, localinit);
1352         }
1353 }
1354
1355 static void funcdef(char *name, struct type *type, struct name *args,
1356                         int nargs, unsigned flags)
1357 {
1358         struct name global;
1359         int i;
1360         strcpy(global.name, name);
1361         memcpy(&global.type, type, sizeof(*type));
1362         global.addr = o_func_beg(name, F_GLOBAL(flags));
1363         global.unused = 0;
1364         global_add(&global);
1365         ret_bt = TYPE_BT(&funcs[type->id].ret);
1366         for (i = 0; i < nargs; i++) {
1367                 args[i].addr = o_arg(i, type_totsz(&args[i].type));
1368                 local_add(&args[i]);
1369         }
1370 }
1371
1372 static int readargs(struct name *args)
1373 {
1374         int nargs = 0;
1375         tok_expect('(');
1376         while (tok_see() != ')') {
1377                 if (!tok_jmp(TOK3("...")))
1378                         break;
1379                 readname(&args[nargs].type, args[nargs].name, NULL, 0);
1380                 array2ptr(&args[nargs].type);
1381                 nargs++;
1382                 if (tok_jmp(','))
1383                         break;
1384         }
1385         tok_expect(')');
1386         if (nargs == 1 && !TYPE_BT(&args[0].type))
1387                 return 0;
1388         return nargs;
1389 }
1390
1391 static int readname(struct type *main, char *name,
1392                         struct type *base, unsigned flags)
1393 {
1394         struct type tpool[3];
1395         int npool = 0;
1396         struct type *type = &tpool[npool++];
1397         struct type *func = NULL;
1398         struct type *ret = NULL;
1399         int arsz[10];
1400         int nar = 0;
1401         int i;
1402         memset(tpool, 0, sizeof(tpool));
1403         if (name)
1404                 *name = '\0';
1405         if (!base) {
1406                 if (basetype(type, &flags))
1407                         return 1;
1408         } else {
1409                 memcpy(type, base, sizeof(*base));
1410         }
1411         readptrs(type);
1412         if (!tok_jmp('(')) {
1413                 ret = type;
1414                 type = &tpool[npool++];
1415                 func = type;
1416                 readptrs(type);
1417         }
1418         if (!tok_jmp(TOK_NAME) && name)
1419                 strcpy(name, tok_id());
1420         while (!tok_jmp('[')) {
1421                 long n = 0;
1422                 if (tok_jmp(']')) {
1423                         readexpr();
1424                         ts_pop(NULL);
1425                         if (o_popnum(&n))
1426                                 err("const expr expected\n");
1427                         tok_expect(']');
1428                 }
1429                 arsz[nar++] = n;
1430         }
1431         for (i = nar - 1; i >= 0; i--) {
1432                 type->id = array_add(type, arsz[i]);
1433                 if (type->flags & T_FUNC)
1434                         func = &arrays[type->id].type;
1435                 type->flags = T_ARRAY;
1436                 type->bt = 8;
1437                 type->ptr = 0;
1438         }
1439         if (func)
1440                 tok_expect(')');
1441         if (tok_see() == '(') {
1442                 struct name args[MAXARGS];
1443                 int nargs = readargs(args);
1444                 int fdef = !func;
1445                 if (!func) {
1446                         ret = type;
1447                         type = &tpool[npool++];
1448                         func = type;
1449                 }
1450                 func->flags = T_FUNC;
1451                 func->bt = 8;
1452                 func->id = func_create(ret, args, nargs);
1453                 if (fdef && tok_see() == '{') {
1454                         funcdef(name, func, args, nargs, flags);
1455                         return 1;
1456                 }
1457         }
1458         memcpy(main, type, sizeof(*type));
1459         return 0;
1460 }
1461
1462 static int readdefs(void (*def)(void *data, struct name *name, unsigned flags),
1463                         void *data)
1464 {
1465         struct type base;
1466         unsigned flags;
1467         if (basetype(&base, &flags))
1468                 return 1;
1469         while (tok_see() != ';' && tok_see() != '{') {
1470                 struct name name;
1471                 name.unused = 0;
1472                 if (readname(&name.type, name.name, &base, flags))
1473                         break;
1474                 if (!tok_jmp('='))
1475                         flags |= F_INIT;
1476                 def(data, &name, flags);
1477                 tok_jmp(',');
1478         }
1479         return 0;
1480 }
1481
1482 static void typedefdef(void *data, struct name *name, unsigned flags)
1483 {
1484         typedef_add(name->name, &name->type);
1485 }
1486
1487 static void readstmt(void);
1488
1489 #define MAXCASES                (1 << 7)
1490
1491 static void readswitch(void)
1492 {
1493         int break_beg = nbreaks;
1494         long val_addr = o_mklocal(8);
1495         long matched[MAXCASES];
1496         int nmatched = 0;
1497         struct type t;
1498         long next;
1499         int ref = 1;
1500         int i;
1501         tok_expect('(');
1502         readexpr();
1503         ts_pop(&t);
1504         o_local(val_addr, TYPE_BT(&t));
1505         o_tmpswap();
1506         o_assign(TYPE_BT(&t));
1507         o_tmpdrop(1);
1508         tok_expect(')');
1509         tok_expect('{');
1510         while (tok_jmp('}')) {
1511                 int n = 0;
1512                 while (tok_see() == TOK_CASE || tok_see() == TOK_DEFAULT) {
1513                         if (n++ > 0)
1514                                 matched[nmatched++] = o_jmp(0);
1515                         if (!ref++)
1516                                 o_filljmp(next);
1517                         if (!tok_jmp(TOK_CASE)) {
1518                                 caseexpr = 1;
1519                                 readexpr();
1520                                 caseexpr = 0;
1521                                 o_local(val_addr, TYPE_BT(&t));
1522                                 o_eq();
1523                                 next = o_jz(0);
1524                                 ref = 0;
1525                                 tok_expect(':');
1526                                 o_tmpdrop(1);
1527                                 ts_pop(NULL);
1528                                 continue;
1529                         }
1530                         if (!tok_jmp(TOK_DEFAULT)) {
1531                                 tok_expect(':');
1532                                 continue;
1533                         }
1534                 }
1535                 for (i = 0; i < nmatched; i++)
1536                         o_filljmp(matched[i]);
1537                 nmatched = 0;
1538                 readstmt();
1539         }
1540         o_rmlocal(val_addr, 8);
1541         if (!ref++)
1542                 o_filljmp(next);
1543         break_fill(o_mklabel(), break_beg);
1544 }
1545
1546 #define MAXGOTO                 (1 << 10)
1547
1548 static struct gotoinfo {
1549         char name[NAMELEN];
1550         long addr;
1551 } gotos[MAXGOTO];
1552 static int ngotos;
1553
1554 static struct labelinfo {
1555         char name[NAMELEN];
1556         long addr;
1557 } labels[MAXGOTO];
1558 static int nlabels;
1559
1560 static void goto_add(char *name)
1561 {
1562         strcpy(gotos[ngotos].name, name);
1563         gotos[ngotos++].addr = o_jmp(0);
1564 }
1565
1566 static void label_add(char *name)
1567 {
1568         strcpy(labels[nlabels].name, name);
1569         labels[nlabels++].addr = o_mklabel();
1570 }
1571
1572 static void goto_fill(void)
1573 {
1574         int i, j;
1575         for (i = 0; i < ngotos; i++)
1576                 for (j = 0; j < nlabels; j++)
1577                         if (!strcmp(gotos[i].name, labels[j].name)) {
1578                                 o_filljmp2(gotos[i].addr, labels[j].addr);
1579                                 break;
1580                         }
1581 }
1582
1583 static void readstmt(void)
1584 {
1585         o_tmpdrop(-1);
1586         nts = 0;
1587         if (!tok_jmp('{')) {
1588                 int _nlocals = nlocals;
1589                 int _nglobals = nglobals;
1590                 int _nenums = nenums;
1591                 int _ntypedefs = ntypedefs;
1592                 int _nstructs = nstructs;
1593                 int _nfuncs = nfuncs;
1594                 int _narrays = narrays;
1595                 while (tok_jmp('}'))
1596                         readstmt();
1597                 nlocals = _nlocals;
1598                 nenums = _nenums;
1599                 ntypedefs = _ntypedefs;
1600                 nstructs = _nstructs;
1601                 nfuncs = _nfuncs;
1602                 narrays = _narrays;
1603                 nglobals = _nglobals;
1604                 return;
1605         }
1606         if (!readdefs(localdef, NULL)) {
1607                 tok_expect(';');
1608                 return;
1609         }
1610         if (!tok_jmp(TOK_TYPEDEF)) {
1611                 readdefs(typedefdef, NULL);
1612                 tok_expect(';');
1613                 return;
1614         }
1615         if (!tok_jmp(TOK_IF)) {
1616                 long l1, l2;
1617                 tok_expect('(');
1618                 readexpr();
1619                 tok_expect(')');
1620                 l1 = o_jz(0);
1621                 readstmt();
1622                 if (!tok_jmp(TOK_ELSE)) {
1623                         l2 = o_jmp(0);
1624                         o_filljmp(l1);
1625                         readstmt();
1626                         o_filljmp(l2);
1627                 } else {
1628                         o_filljmp(l1);
1629                 }
1630                 return;
1631         }
1632         if (!tok_jmp(TOK_WHILE)) {
1633                 long l1, l2;
1634                 int break_beg = nbreaks;
1635                 int continue_beg = ncontinues;
1636                 l1 = o_mklabel();
1637                 tok_expect('(');
1638                 readexpr();
1639                 tok_expect(')');
1640                 l2 = o_jz(0);
1641                 readstmt();
1642                 o_jmp(l1);
1643                 o_filljmp(l2);
1644                 break_fill(o_mklabel(), break_beg);
1645                 continue_fill(l1, continue_beg);
1646                 return;
1647         }
1648         if (!tok_jmp(TOK_DO)) {
1649                 long l1, l2;
1650                 int break_beg = nbreaks;
1651                 int continue_beg = ncontinues;
1652                 l1 = o_mklabel();
1653                 readstmt();
1654                 tok_expect(TOK_WHILE);
1655                 tok_expect('(');
1656                 l2 = o_mklabel();
1657                 readexpr();
1658                 o_jnz(l1);
1659                 tok_expect(')');
1660                 break_fill(o_mklabel(), break_beg);
1661                 continue_fill(l2, continue_beg);
1662                 return;
1663         }
1664         if (!tok_jmp(TOK_FOR)) {
1665                 long l_check, l_jump, j_fail, j_pass;
1666                 int break_beg = nbreaks;
1667                 int continue_beg = ncontinues;
1668                 int has_cond = 0;
1669                 tok_expect('(');
1670                 if (tok_see() != ';')
1671                         readestmt();
1672                 tok_expect(';');
1673                 l_check = o_mklabel();
1674                 if (tok_see() != ';') {
1675                         readestmt();
1676                         j_fail = o_jz(0);
1677                         has_cond = 1;
1678                 }
1679                 tok_expect(';');
1680                 j_pass = o_jmp(0);
1681                 l_jump = o_mklabel();
1682                 if (tok_see() != ')')
1683                         readestmt();
1684                 tok_expect(')');
1685                 o_jmp(l_check);
1686                 o_filljmp(j_pass);
1687                 readstmt();
1688                 o_jmp(l_jump);
1689                 if (has_cond)
1690                         o_filljmp(j_fail);
1691                 break_fill(o_mklabel(), break_beg);
1692                 continue_fill(l_jump, continue_beg);
1693                 return;
1694         }
1695         if (!tok_jmp(TOK_SWITCH)) {
1696                 readswitch();
1697                 return;
1698         }
1699         if (!tok_jmp(TOK_RETURN)) {
1700                 int ret = tok_see() != ';';
1701                 if (ret)
1702                         readexpr();
1703                 tok_expect(';');
1704                 o_ret(ret_bt);
1705                 return;
1706         }
1707         if (!tok_jmp(TOK_BREAK)) {
1708                 tok_expect(';');
1709                 breaks[nbreaks++] = o_jmp(0);
1710                 return;
1711         }
1712         if (!tok_jmp(TOK_CONTINUE)) {
1713                 tok_expect(';');
1714                 continues[ncontinues++] = o_jmp(0);
1715                 return;
1716         }
1717         if (!tok_jmp(TOK_GOTO)) {
1718                 tok_expect(TOK_NAME);
1719                 goto_add(tok_id());
1720                 tok_expect(';');
1721                 return;
1722         }
1723         readestmt();
1724         /* labels */
1725         if (!tok_jmp(':')) {
1726                 label_add(tok_id());
1727                 return;
1728         }
1729         tok_expect(';');
1730 }
1731
1732 static void readdecl(void)
1733 {
1734         if (!tok_jmp(TOK_TYPEDEF)) {
1735                 readdefs(typedefdef, NULL);
1736                 tok_expect(';');
1737                 return;
1738         }
1739         readdefs(globaldef, NULL);
1740         if (tok_see() == '{') {
1741                 readstmt();
1742                 goto_fill();
1743                 o_func_end();
1744                 nlocals = 0;
1745                 ngotos = 0;
1746                 nlabels = 0;
1747                 return;
1748         }
1749         tok_expect(';');
1750 }
1751
1752 static void parse(void)
1753 {
1754         while (tok_see() != TOK_EOF)
1755                 readdecl();
1756 }
1757
1758 int main(int argc, char *argv[])
1759 {
1760         char obj[128];
1761         int ofd;
1762         int i = 1;
1763         while (i < argc && argv[i][0] == '-') {
1764                 if (argv[i][1] == 'I')
1765                         cpp_addpath(argv[i][2] ? argv[i] + 2 : argv[++i]);
1766                 if (argv[i][1] == 'D') {
1767                         char *name = argv[i] + 2;
1768                         char *def = "";
1769                         char *eq = strchr(name, '=');
1770                         if (eq) {
1771                                 *eq = '\0';
1772                                 def = eq + 1;
1773                         }
1774                         cpp_define(name, def);
1775                 }
1776                 i++;
1777         }
1778         if (i == argc)
1779                 die("neatcc: no file given\n");
1780         if (cpp_init(argv[i]))
1781                 die("neatcc: cannot open input file\n");
1782         parse();
1783         strcpy(obj, argv[i]);
1784         obj[strlen(obj) - 1] = 'o';
1785         ofd = open(obj, O_WRONLY | O_TRUNC | O_CREAT, 0600);
1786         out_write(ofd);
1787         close(ofd);
1788         return 0;
1789 }