ncc.c

   1 /*
   2  * neatcc - A small and simple 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 ? LONGSZ : (t)->bt)
  25 #define TYPE_SZ(t)              ((t)->ptr ? LONGSZ : (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 LONGSZ;
 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(int op)
 298 {
 299         struct type t1, t2;
 300         ts_pop(&t1);
 301         ts_pop(&t2);
 302         o_bop(op);
 303         ts_push_bt(bt_op(TYPE_BT(&t1), TYPE_BT(&t2)));
 304 }
 305
 306 static void ts_addop(int op)
 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_bop(op);
 315                 ts_push_bt(bt_op(TYPE_BT(&t1), TYPE_BT(&t2)));
 316                 return;
 317         }
 318         if (t1.ptr && !t2.ptr)
 319                 o_tmpswap();
 320         if (!t1.ptr && t2.ptr)
 321                 if (type_szde(&t2) > 1) {
 322                         o_num(type_szde(&t2), 4);
 323                         o_bop(O_MUL);
 324                 }
 325         if (t1.ptr && !t2.ptr)
 326                 o_tmpswap();
 327         o_bop(op);
 328         if (t1.ptr && t2.ptr) {
 329                 int sz = type_szde(&t1);
 330                 if (sz > 1) {
 331                         o_num(sz, 4);
 332                         o_bop(O_DIV);
 333                 }
 334                 ts_push_bt(4 | BT_SIGNED);
 335         } else {
 336                 ts_push(t1.ptr ? &t1 : &t2);
 337         }
 338 }
 339
 340 #define ALIGN(x, a)             (((x) + (a) - 1) & ~((a) - 1))
 341 #define MIN(a, b)               ((a) < (b) ? (a) : (b))
 342
 343 static int type_alignment(struct type *t)
 344 {
 345         if (t->flags & T_ARRAY && !t->ptr)
 346                 return type_alignment(&arrays[t->id].type);
 347         if (t->flags & T_STRUCT && !t->ptr)
 348                 return type_alignment(&structs[t->id].fields[0].type);
 349         return MIN(LONGSZ, type_totsz(t));
 350 }
 351
 352 static void structdef(void *data, struct name *name, unsigned flags)
 353 {
 354         struct structinfo *si = data;
 355         if (si->isunion) {
 356                 name->addr = 0;
 357                 if (si->size < type_totsz(&name->type))
 358                         si->size = type_totsz(&name->type);
 359         } else {
 360                 struct type *t = &name->type;
 361                 int alignment = type_alignment(t);
 362                 if (t->flags & T_ARRAY && !t->ptr)
 363                         alignment = MIN(LONGSZ, type_totsz(&arrays[t->id].type));
 364                 si->size = ALIGN(si->size, alignment);
 365                 name->addr = si->size;
 366                 si->size += type_totsz(&name->type);
 367         }
 368         memcpy(&si->fields[si->nfields++], name, sizeof(*name));
 369 }
 370
 371 static int readdefs(void (*def)(void *, struct name *, unsigned f), void *data);
 372
 373 static int struct_create(char *name, int isunion)
 374 {
 375         int id = struct_find(name, isunion);
 376         struct structinfo *si = &structs[id];
 377         tok_expect('{');
 378         while (tok_jmp('}')) {
 379                 readdefs(structdef, si);
 380                 tok_expect(';');
 381         }
 382         return id;
 383 }
 384
 385 static void readexpr(void);
 386
 387 static void enum_create(void)
 388 {
 389         long n = 0;
 390         tok_expect('{');
 391         while (tok_jmp('}')) {
 392                 char name[NAMELEN];
 393                 tok_expect(TOK_NAME);
 394                 strcpy(name, tok_id());
 395                 if (tok_see() == '=') {
 396                         tok_get();
 397                         readexpr();
 398                         ts_pop(NULL);
 399                         if (o_popnum(&n))
 400                                 err("const expr expected!\n");
 401                 }
 402                 enum_add(name, n++);
 403                 tok_jmp(',');
 404         }
 405 }
 406
 407 static int basetype(struct type *type, unsigned *flags)
 408 {
 409         int sign = 1;
 410         int size = 4;
 411         int done = 0;
 412         int i = 0;
 413         int isunion;
 414         char name[NAMELEN] = "";
 415         *flags = 0;
 416         type->flags = 0;
 417         type->ptr = 0;
 418         while (!done) {
 419                 switch (tok_see()) {
 420                 case TOK_STATIC:
 421                         *flags |= F_STATIC;
 422                         break;
 423                 case TOK_EXTERN:
 424                         *flags |= F_EXTERN;
 425                         break;
 426                 case TOK_VOID:
 427                         sign = 0;
 428                         size = 0;
 429                         done = 1;
 430                         break;
 431                 case TOK_INT:
 432                         done = 1;
 433                         break;
 434                 case TOK_CHAR:
 435                         size = 1;
 436                         done = 1;
 437                         break;
 438                 case TOK_SHORT:
 439                         size = 2;
 440                         break;
 441                 case TOK_LONG:
 442                         size = LONGSZ;
 443                         break;
 444                 case TOK_SIGNED:
 445                         break;
 446                 case TOK_UNSIGNED:
 447                         sign = 0;
 448                         break;
 449                 case TOK_UNION:
 450                 case TOK_STRUCT:
 451                         isunion = tok_get() == TOK_UNION;
 452                         if (!tok_jmp(TOK_NAME))
 453                                 strcpy(name, tok_id());
 454                         if (tok_see() == '{')
 455                                 type->id = struct_create(name, isunion);
 456                         else
 457                                 type->id = struct_find(name, isunion);
 458                         type->flags |= T_STRUCT;
 459                         type->bt = LONGSZ;
 460                         return 0;
 461                 case TOK_ENUM:
 462                         tok_get();
 463                         tok_jmp(TOK_NAME);
 464                         if (tok_see() == '{')
 465                                 enum_create();
 466                         type->bt = 4 | BT_SIGNED;
 467                         return 0;
 468                 default:
 469                         if (tok_see() == TOK_NAME) {
 470                                 int id = typedef_find(tok_id());
 471                                 if (id != -1) {
 472                                         tok_get();
 473                                         memcpy(type, &typedefs[id].type,
 474                                                 sizeof(*type));
 475                                         return 0;
 476                                 }
 477                         }
 478                         if (!i)
 479                                 return 1;
 480                         done = 1;
 481                         continue;
 482                 }
 483                 i++;
 484                 tok_get();
 485         }
 486         type->bt = size | (sign ? BT_SIGNED : 0);
 487         return 0;
 488 }
 489
 490 static int readname(struct type *main, char *name,
 491                         struct type *base, unsigned flags);
 492
 493 static int readtype(struct type *type)
 494 {
 495         return readname(type, NULL, NULL, 0);
 496 }
 497
 498 static void readptrs(struct type *type)
 499 {
 500         while (!tok_jmp('*')) {
 501                 type->ptr++;
 502                 if (!type->bt)
 503                         type->bt = 1;
 504         }
 505 }
 506
 507 /* used to differenciate labels from case and cond exprs */
 508 static int ncexpr;
 509 static int caseexpr;
 510
 511 static void readpre(void);
 512
 513 static void readprimary(void)
 514 {
 515         int i;
 516         if (!tok_jmp(TOK_NUM)) {
 517                 long n;
 518                 int bt = tok_num(&n);
 519                 ts_push_bt(bt);
 520                 o_num(n, bt);
 521                 return;
 522         }
 523         if (!tok_jmp(TOK_STR)) {
 524                 struct type t;
 525                 char buf[BUFSIZE];
 526                 int len;
 527                 t.bt = 1 | BT_SIGNED;
 528                 t.ptr = 1;
 529                 t.flags = 0;
 530                 ts_push(&t);
 531                 len = tok_str(buf);
 532                 o_symaddr(out_mkdat(NULL, buf, len, 0), TYPE_BT(&t));
 533                 o_addr();
 534                 return;
 535         }
 536         if (!tok_jmp(TOK_NAME)) {
 537                 struct name unkn = {0};
 538                 char *name = unkn.name;
 539                 int n;
 540                 strcpy(name, tok_id());
 541                 /* don't search for labels here */
 542                 if (!ncexpr && !caseexpr && tok_see() == ':')
 543                         return;
 544                 for (i = nlocals - 1; i >= 0; --i) {
 545                         struct type *t = &locals[i].type;
 546                         if (!strcmp(locals[i].name, name)) {
 547                                 o_local(locals[i].addr, TYPE_BT(t));
 548                                 ts_push(t);
 549                                 return;
 550                         }
 551                 }
 552                 if ((n = global_find(name)) != -1) {
 553                         struct name *g = &globals[n];
 554                         struct type *t = &g->type;
 555                         if (g->unused) {
 556                                 g->unused = 0;
 557                                 if (t->flags & T_FUNC && !t->ptr)
 558                                         g->addr = out_mkundef(name, 0);
 559                                 else
 560                                         g->addr = out_mkundef(name, type_totsz(t));
 561                         }
 562                         o_symaddr(g->addr, TYPE_BT(t));
 563                         ts_push(t);
 564                         return;
 565                 }
 566                 if (!enum_find(&n, name)) {
 567                         ts_push_bt(4 | BT_SIGNED);
 568                         o_num(n, 4 | BT_SIGNED);
 569                         return;
 570                 }
 571                 if (tok_see() != '(')
 572                         err("unknown symbol\n");
 573                 unkn.addr = out_mkundef(unkn.name, 0);
 574                 global_add(&unkn);
 575                 ts_push_bt(LONGSZ);
 576                 o_symaddr(unkn.addr, LONGSZ);
 577                 return;
 578         }
 579         if (!tok_jmp('(')) {
 580                 struct type t;
 581                 if (!readtype(&t)) {
 582                         struct type o;
 583                         tok_expect(')');
 584                         readpre();
 585                         ts_pop(&o);
 586                         ts_push(&t);
 587                         if (!t.ptr || !o.ptr)
 588                                 o_cast(TYPE_BT(&t));
 589                 } else {
 590                         readexpr();
 591                         tok_expect(')');
 592                 }
 593                 return;
 594         }
 595 }
 596
 597 void arrayderef(struct type *t)
 598 {
 599         int sz = type_totsz(t);
 600         if (sz > 1) {
 601                 o_num(sz, 4);
 602                 o_bop(O_MUL);
 603         }
 604         o_bop(O_ADD);
 605         o_deref(TYPE_BT(t));
 606 }
 607
 608 static void inc_post(int inc_one, int inc_many)
 609 {
 610         struct type *t = &ts[nts - 1];
 611         int sz = type_szde(t);
 612         o_tmpcopy();
 613         o_load();
 614         o_tmpswap();
 615         if (!t->ptr || sz == 1) {
 616                 o_uop(inc_one);
 617         } else {
 618                 o_tmpcopy();
 619                 o_num(sz, 4);
 620                 o_bop(inc_many);
 621                 o_assign(TYPE_BT(t));
 622         }
 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_bop(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(LONGSZ);
 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_INC, O_ADD);
 719                         continue;
 720                 }
 721                 if (!tok_jmp(TOK2("--"))) {
 722                         inc_post(O_DEC, 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(int inc_one, int inc_many)
 739 {
 740         struct type *t;
 741         int sz;
 742         readpre();
 743         t = &ts[nts - 1];
 744         sz = (t->flags & T_ARRAY || t->ptr) ? type_szde(t) : 1;
 745         if (sz == 1) {
 746                 o_uop(inc_one);
 747         } else {
 748                 o_tmpcopy();
 749                 o_num(sz, 4);
 750                 o_bop(inc_many);
 751                 o_assign(TYPE_BT(t));
 752         }
 753 }
 754
 755 static void readpre(void)
 756 {
 757         if (!tok_jmp('&')) {
 758                 struct type type;
 759                 readpre();
 760                 ts_pop(&type);
 761                 type.ptr++;
 762                 ts_push(&type);
 763                 o_addr();
 764                 return;
 765         }
 766         if (!tok_jmp('*')) {
 767                 struct type t;
 768                 readpre();
 769                 ts_pop(&t);
 770                 array2ptr(&t);
 771                 t.ptr--;
 772                 o_deref(TYPE_BT(&t));
 773                 ts_push(&t);
 774                 return;
 775         }
 776         if (!tok_jmp('!')) {
 777                 struct type type;
 778                 readpre();
 779                 ts_pop(&type);
 780                 o_uop(O_LNOT);
 781                 ts_push_bt(4 | BT_SIGNED);
 782                 return;
 783         }
 784         if (!tok_jmp('-')) {
 785                 readpre();
 786                 o_uop(O_NEG);
 787                 return;
 788         }
 789         if (!tok_jmp('~')) {
 790                 readpre();
 791                 o_uop(O_NOT);
 792                 return;
 793         }
 794         if (!tok_jmp(TOK2("++"))) {
 795                 inc_pre(O_INC, O_ADD);
 796                 return;
 797         }
 798         if (!tok_jmp(TOK2("--"))) {
 799                 inc_pre(O_DEC, 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_addop(O_ADD);
 852                         continue;
 853                 }
 854                 if (!tok_jmp('-')) {
 855                         readmul();
 856                         ts_addop(O_SUB);
 857                         continue;
 858                 }
 859                 break;
 860         }
 861 }
 862
 863 static void shift(int op)
 864 {
 865         struct type t;
 866         readadd();
 867         ts_pop(NULL);
 868         ts_pop(&t);
 869         o_bop(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(int op)
 890 {
 891         readshift();
 892         ts_pop(NULL);
 893         ts_pop(NULL);
 894         o_bop(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(int op)
 923 {
 924         readcmp();
 925         ts_pop(NULL);
 926         ts_pop(NULL);
 927         o_bop(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(int op, int ptrop)
1088 {
1089         struct type *t = &ts[nts - 1];
1090         if (ptrop && (t->flags & T_ARRAY || t->ptr)) {
1091                 o_tmpcopy();
1092                 readexpr();
1093                 ts_addop(op);
1094                 o_assign(TYPE_BT(&ts[nts - 1]));
1095                 ts_pop(NULL);
1096         } else {
1097                 readexpr();
1098                 o_bop(op | O_SET);
1099                 ts_pop(NULL);
1100         }
1101 }
1102
1103 static void doassign(void)
1104 {
1105         struct type t;
1106         ts_pop(&t);
1107         if (!t.ptr && t.flags & T_STRUCT)
1108                 o_memcpy(type_totsz(&t));
1109         else
1110                 o_assign(TYPE_BT(&ts[nts - 1]));
1111 }
1112
1113 static void readexpr(void)
1114 {
1115         readcexpr();
1116         if (!tok_jmp('=')) {
1117                 readexpr();
1118                 doassign();
1119                 return;
1120         }
1121         if (!tok_jmp(TOK2("+="))) {
1122                 opassign(O_ADD, 1);
1123                 return;
1124         }
1125         if (!tok_jmp(TOK2("-="))) {
1126                 opassign(O_SUB, 1);
1127                 return;
1128         }
1129         if (!tok_jmp(TOK2("*="))) {
1130                 opassign(O_MUL, 0);
1131                 return;
1132         }
1133         if (!tok_jmp(TOK2("/="))) {
1134                 opassign(O_DIV, 0);
1135                 return;
1136         }
1137         if (!tok_jmp(TOK2("%="))) {
1138                 opassign(O_MOD, 0);
1139                 return;
1140         }
1141         if (!tok_jmp(TOK3("<<="))) {
1142                 opassign(O_SHL, 0);
1143                 return;
1144         }
1145         if (!tok_jmp(TOK3(">>="))) {
1146                 opassign(O_SHR, 0);
1147                 return;
1148         }
1149         if (!tok_jmp(TOK3("&="))) {
1150                 opassign(O_AND, 0);
1151                 return;
1152         }
1153         if (!tok_jmp(TOK3("|="))) {
1154                 opassign(O_OR, 0);
1155                 return;
1156         }
1157         if (!tok_jmp(TOK3("^="))) {
1158                 opassign(O_XOR, 0);
1159                 return;
1160         }
1161 }
1162
1163 static void readestmt(void)
1164 {
1165         do {
1166                 o_tmpdrop(-1);
1167                 nts = 0;
1168                 readexpr();
1169         } while (!tok_jmp(','));
1170 }
1171
1172 static void o_localoff(long addr, int off, unsigned bt)
1173 {
1174         o_local(addr, bt);
1175         if (off) {
1176                 o_addr();
1177                 o_num(off, 4);
1178                 o_bop(O_ADD);
1179                 o_deref(bt);
1180         }
1181 }
1182
1183 static struct type *innertype(struct type *t)
1184 {
1185         if (t->flags & T_ARRAY && !t->ptr)
1186                 return innertype(&arrays[t->id].type);
1187         return t;
1188 }
1189
1190 static void initexpr(struct type *t, int off, void *obj,
1191                 void (*set)(void *obj, int off, struct type *t))
1192 {
1193         if (tok_jmp('{')) {
1194                 set(obj, off, t);
1195                 return;
1196         }
1197         if (!t->ptr && t->flags & T_STRUCT) {
1198                 struct structinfo *si = &structs[t->id];
1199                 int i;
1200                 for (i = 0; i < si->nfields; i++) {
1201                         struct name *field = &si->fields[i];
1202                         if (!tok_jmp('.')) {
1203                                 tok_expect(TOK_NAME);
1204                                 field = struct_field(t->id, tok_id());
1205                                 tok_expect('=');
1206                         }
1207                         initexpr(&field->type, off + field->addr, obj, set);
1208                         if (tok_jmp(',') || tok_see() == '}')
1209                                 break;
1210                 }
1211         } else if (t->flags & T_ARRAY) {
1212                 struct type *t_de = &arrays[t->id].type;
1213                 int i;
1214                 for (i = 0; ; i++) {
1215                         long idx = i;
1216                         struct type *it = t_de;
1217                         if (!tok_jmp('[')) {
1218                                 readexpr();
1219                                 o_popnum(&idx);
1220                                 ts_pop(NULL);
1221                                 tok_expect(']');
1222                                 tok_expect('=');
1223                         }
1224                         if (tok_see() != '{')
1225                                 it = innertype(t_de);
1226                         initexpr(it, off + type_totsz(it) * idx, obj, set);
1227                         if (tok_jmp(',') || tok_see() == '}')
1228                                 break;
1229                 }
1230         }
1231         tok_expect('}');
1232 }
1233
1234 static void jumpbrace(void)
1235 {
1236         int depth = 0;
1237         while (tok_see() != '}' || depth--)
1238                 if (tok_get() == '{')
1239                         depth++;
1240         tok_expect('}');
1241 }
1242
1243 static int initsize(void)
1244 {
1245         long addr = tok_addr();
1246         int n = 0;
1247         if (!tok_jmp(TOK_STR)) {
1248                 n = tok_str(NULL);
1249                 tok_jump(addr);
1250                 return n;
1251         }
1252         o_nogen();
1253         tok_expect('{');
1254         while (tok_jmp('}')) {
1255                 long idx = n;
1256                 if (!tok_jmp('[')) {
1257                         readexpr();
1258                         o_popnum(&idx);
1259                         ts_pop(NULL);
1260                         tok_expect(']');
1261                         tok_expect('=');
1262                 }
1263                 if (n < idx + 1)
1264                         n = idx + 1;
1265                 while (tok_see() != '}' && tok_see() != ',')
1266                         if (tok_get() == '{')
1267                                 jumpbrace();
1268                 tok_jmp(',');
1269         }
1270         o_dogen();
1271         tok_jump(addr);
1272         return n;
1273 }
1274
1275 #define F_GLOBAL(flags)         (!((flags) & F_STATIC))
1276
1277 static void globalinit(void *obj, int off, struct type *t)
1278 {
1279         long addr = *(long *) obj;
1280         if (t->flags & T_ARRAY && tok_see() == TOK_STR) {
1281                 struct type *t_de = &arrays[t->id].type;
1282                 if (!t_de->ptr && !t_de->flags && TYPE_SZ(t_de) == 1) {
1283                         char buf[BUFSIZE];
1284                         int len;
1285                         tok_expect(TOK_STR);
1286                         len = tok_str(buf);
1287                         out_datcpy(addr, off, buf, len);
1288                         return;
1289                 }
1290         }
1291         readexpr();
1292         o_datset(addr, off, TYPE_BT(t));
1293         ts_pop(NULL);
1294 }
1295
1296 static void globaldef(void *data, struct name *name, unsigned flags)
1297 {
1298         struct type *t = &name->type;
1299         char *varname = flags & F_STATIC ? NULL : name->name;
1300         int sz;
1301         if (t->flags & T_ARRAY && !t->ptr && !arrays[t->id].n)
1302                 if (~flags & F_EXTERN)
1303                         arrays[t->id].n = initsize();
1304         sz = type_totsz(t);
1305         if (flags & F_EXTERN || t->flags & T_FUNC && !t->ptr)
1306                 name->unused = 1;
1307         else if (flags & F_INIT)
1308                 name->addr = out_mkdat(varname, NULL, sz, F_GLOBAL(flags));
1309         else
1310                 name->addr = out_mkvar(varname, sz, F_GLOBAL(flags));
1311         global_add(name);
1312         if (flags & F_INIT)
1313                 initexpr(t, 0, &name->addr, globalinit);
1314 }
1315
1316 static void localinit(void *obj, int off, struct type *t)
1317 {
1318         long addr = *(long *) obj;
1319         if (t->flags & T_ARRAY && tok_see() == TOK_STR) {
1320                 struct type *t_de = &arrays[t->id].type;
1321                 if (!t_de->ptr && !t_de->flags && TYPE_SZ(t_de) == 1) {
1322                         char buf[BUFSIZE];
1323                         int len;
1324                         tok_expect(TOK_STR);
1325                         len = tok_str(buf);
1326                         o_localoff(addr, off, TYPE_BT(t));
1327                         o_symaddr(out_mkdat(NULL, buf, len, 0), TYPE_BT(t));
1328                         o_memcpy(len);
1329                         o_tmpdrop(1);
1330                         return;
1331                 }
1332         }
1333         o_localoff(addr, off, TYPE_BT(t));
1334         ts_push(t);
1335         readexpr();
1336         doassign();
1337         ts_pop(NULL);
1338         o_tmpdrop(1);
1339 }
1340
1341 static void localdef(void *data, struct name *name, unsigned flags)
1342 {
1343         struct type *t = &name->type;
1344         if (flags & (F_STATIC | F_EXTERN)) {
1345                 globaldef(data, name, flags);
1346                 return;
1347         }
1348         if (t->flags & T_ARRAY && !t->ptr && !arrays[t->id].n)
1349                 arrays[t->id].n = initsize();
1350         name->addr = o_mklocal(type_totsz(&name->type));
1351         local_add(name);
1352         if (flags & F_INIT) {
1353                 if (t->flags & (T_ARRAY | T_STRUCT) && !t->ptr) {
1354                         o_local(name->addr, TYPE_BT(t));
1355                         o_memset(0, type_totsz(t));
1356                         o_tmpdrop(1);
1357                 }
1358                 initexpr(t, 0, &name->addr, localinit);
1359         }
1360 }
1361
1362 static void funcdef(char *name, struct type *type, struct name *args,
1363                         int nargs, unsigned flags)
1364 {
1365         struct name global;
1366         int i;
1367         strcpy(global.name, name);
1368         memcpy(&global.type, type, sizeof(*type));
1369         global.addr = o_func_beg(name, F_GLOBAL(flags));
1370         global.unused = 0;
1371         global_add(&global);
1372         ret_bt = TYPE_BT(&funcs[type->id].ret);
1373         for (i = 0; i < nargs; i++) {
1374                 args[i].addr = o_arg(i, type_totsz(&args[i].type));
1375                 local_add(&args[i]);
1376         }
1377 }
1378
1379 static int readargs(struct name *args)
1380 {
1381         int nargs = 0;
1382         tok_expect('(');
1383         while (tok_see() != ')') {
1384                 if (!tok_jmp(TOK3("...")))
1385                         break;
1386                 readname(&args[nargs].type, args[nargs].name, NULL, 0);
1387                 array2ptr(&args[nargs].type);
1388                 nargs++;
1389                 if (tok_jmp(','))
1390                         break;
1391         }
1392         tok_expect(')');
1393         if (nargs == 1 && !TYPE_BT(&args[0].type))
1394                 return 0;
1395         return nargs;
1396 }
1397
1398 static int readname(struct type *main, char *name,
1399                         struct type *base, unsigned flags)
1400 {
1401         struct type tpool[3];
1402         int npool = 0;
1403         struct type *type = &tpool[npool++];
1404         struct type *func = NULL;
1405         struct type *ret = NULL;
1406         int arsz[10];
1407         int nar = 0;
1408         int i;
1409         memset(tpool, 0, sizeof(tpool));
1410         if (name)
1411                 *name = '\0';
1412         if (!base) {
1413                 if (basetype(type, &flags))
1414                         return 1;
1415         } else {
1416                 memcpy(type, base, sizeof(*base));
1417         }
1418         readptrs(type);
1419         if (!tok_jmp('(')) {
1420                 ret = type;
1421                 type = &tpool[npool++];
1422                 func = type;
1423                 readptrs(type);
1424         }
1425         if (!tok_jmp(TOK_NAME) && name)
1426                 strcpy(name, tok_id());
1427         while (!tok_jmp('[')) {
1428                 long n = 0;
1429                 if (tok_jmp(']')) {
1430                         readexpr();
1431                         ts_pop(NULL);
1432                         if (o_popnum(&n))
1433                                 err("const expr expected\n");
1434                         tok_expect(']');
1435                 }
1436                 arsz[nar++] = n;
1437         }
1438         for (i = nar - 1; i >= 0; i--) {
1439                 type->id = array_add(type, arsz[i]);
1440                 if (func && i == nar - 1)
1441                         func = &arrays[type->id].type;
1442                 type->flags = T_ARRAY;
1443                 type->bt = LONGSZ;
1444                 type->ptr = 0;
1445         }
1446         if (func)
1447                 tok_expect(')');
1448         if (tok_see() == '(') {
1449                 struct name args[MAXARGS];
1450                 int nargs = readargs(args);
1451                 int fdef = !func;
1452                 if (!func) {
1453                         ret = type;
1454                         type = &tpool[npool++];
1455                         func = type;
1456                 }
1457                 func->flags = T_FUNC;
1458                 func->bt = LONGSZ;
1459                 func->id = func_create(ret, args, nargs);
1460                 if (fdef && tok_see() == '{') {
1461                         funcdef(name, func, args, nargs, flags);
1462                         return 1;
1463                 }
1464         }
1465         memcpy(main, type, sizeof(*type));
1466         return 0;
1467 }
1468
1469 static int readdefs(void (*def)(void *data, struct name *name, unsigned flags),
1470                         void *data)
1471 {
1472         struct type base;
1473         unsigned base_flags;
1474         if (basetype(&base, &base_flags))
1475                 return 1;
1476         while (tok_see() != ';' && tok_see() != '{') {
1477                 struct name name;
1478                 unsigned flags = base_flags;
1479                 name.unused = 0;
1480                 if (readname(&name.type, name.name, &base, flags))
1481                         break;
1482                 if (!tok_jmp('='))
1483                         flags |= F_INIT;
1484                 def(data, &name, flags);
1485                 tok_jmp(',');
1486         }
1487         return 0;
1488 }
1489
1490 static void typedefdef(void *data, struct name *name, unsigned flags)
1491 {
1492         typedef_add(name->name, &name->type);
1493 }
1494
1495 static void readstmt(void);
1496
1497 #define MAXCASES                (1 << 7)
1498
1499 static void readswitch(void)
1500 {
1501         int break_beg = nbreaks;
1502         long val_addr = o_mklocal(LONGSZ);
1503         long matched[MAXCASES];
1504         int nmatched = 0;
1505         struct type t;
1506         long next;
1507         int ref = 1;
1508         int i;
1509         tok_expect('(');
1510         readexpr();
1511         ts_pop(&t);
1512         o_local(val_addr, TYPE_BT(&t));
1513         o_tmpswap();
1514         o_assign(TYPE_BT(&t));
1515         o_tmpdrop(1);
1516         tok_expect(')');
1517         tok_expect('{');
1518         while (tok_jmp('}')) {
1519                 int n = 0;
1520                 while (tok_see() == TOK_CASE || tok_see() == TOK_DEFAULT) {
1521                         if (n++ > 0)
1522                                 matched[nmatched++] = o_jmp(0);
1523                         if (!ref++)
1524                                 o_filljmp(next);
1525                         if (!tok_jmp(TOK_CASE)) {
1526                                 caseexpr = 1;
1527                                 readexpr();
1528                                 caseexpr = 0;
1529                                 o_local(val_addr, TYPE_BT(&t));
1530                                 o_bop(O_EQ);
1531                                 next = o_jz(0);
1532                                 ref = 0;
1533                                 tok_expect(':');
1534                                 o_tmpdrop(1);
1535                                 ts_pop(NULL);
1536                                 continue;
1537                         }
1538                         if (!tok_jmp(TOK_DEFAULT)) {
1539                                 tok_expect(':');
1540                                 continue;
1541                         }
1542                 }
1543                 for (i = 0; i < nmatched; i++)
1544                         o_filljmp(matched[i]);
1545                 nmatched = 0;
1546                 readstmt();
1547         }
1548         o_rmlocal(val_addr, LONGSZ);
1549         if (!ref++)
1550                 o_filljmp(next);
1551         break_fill(o_mklabel(), break_beg);
1552 }
1553
1554 #define MAXGOTO                 (1 << 10)
1555
1556 static struct gotoinfo {
1557         char name[NAMELEN];
1558         long addr;
1559 } gotos[MAXGOTO];
1560 static int ngotos;
1561
1562 static struct labelinfo {
1563         char name[NAMELEN];
1564         long addr;
1565 } labels[MAXGOTO];
1566 static int nlabels;
1567
1568 static void goto_add(char *name)
1569 {
1570         strcpy(gotos[ngotos].name, name);
1571         gotos[ngotos++].addr = o_jmp(0);
1572 }
1573
1574 static void label_add(char *name)
1575 {
1576         strcpy(labels[nlabels].name, name);
1577         labels[nlabels++].addr = o_mklabel();
1578 }
1579
1580 static void goto_fill(void)
1581 {
1582         int i, j;
1583         for (i = 0; i < ngotos; i++)
1584                 for (j = 0; j < nlabels; j++)
1585                         if (!strcmp(gotos[i].name, labels[j].name)) {
1586                                 o_filljmp2(gotos[i].addr, labels[j].addr);
1587                                 break;
1588                         }
1589 }
1590
1591 static void readstmt(void)
1592 {
1593         o_tmpdrop(-1);
1594         nts = 0;
1595         if (!tok_jmp('{')) {
1596                 int _nlocals = nlocals;
1597                 int _nglobals = nglobals;
1598                 int _nenums = nenums;
1599                 int _ntypedefs = ntypedefs;
1600                 int _nstructs = nstructs;
1601                 int _nfuncs = nfuncs;
1602                 int _narrays = narrays;
1603                 while (tok_jmp('}'))
1604                         readstmt();
1605                 nlocals = _nlocals;
1606                 nenums = _nenums;
1607                 ntypedefs = _ntypedefs;
1608                 nstructs = _nstructs;
1609                 nfuncs = _nfuncs;
1610                 narrays = _narrays;
1611                 nglobals = _nglobals;
1612                 return;
1613         }
1614         if (!readdefs(localdef, NULL)) {
1615                 tok_expect(';');
1616                 return;
1617         }
1618         if (!tok_jmp(TOK_TYPEDEF)) {
1619                 readdefs(typedefdef, NULL);
1620                 tok_expect(';');
1621                 return;
1622         }
1623         if (!tok_jmp(TOK_IF)) {
1624                 long l1, l2;
1625                 tok_expect('(');
1626                 readexpr();
1627                 tok_expect(')');
1628                 l1 = o_jz(0);
1629                 readstmt();
1630                 if (!tok_jmp(TOK_ELSE)) {
1631                         l2 = o_jmp(0);
1632                         o_filljmp(l1);
1633                         readstmt();
1634                         o_filljmp(l2);
1635                 } else {
1636                         o_filljmp(l1);
1637                 }
1638                 return;
1639         }
1640         if (!tok_jmp(TOK_WHILE)) {
1641                 long l1, l2;
1642                 int break_beg = nbreaks;
1643                 int continue_beg = ncontinues;
1644                 l1 = o_mklabel();
1645                 tok_expect('(');
1646                 readexpr();
1647                 tok_expect(')');
1648                 l2 = o_jz(0);
1649                 readstmt();
1650                 o_jmp(l1);
1651                 o_filljmp(l2);
1652                 break_fill(o_mklabel(), break_beg);
1653                 continue_fill(l1, continue_beg);
1654                 return;
1655         }
1656         if (!tok_jmp(TOK_DO)) {
1657                 long l1, l2;
1658                 int break_beg = nbreaks;
1659                 int continue_beg = ncontinues;
1660                 l1 = o_mklabel();
1661                 readstmt();
1662                 tok_expect(TOK_WHILE);
1663                 tok_expect('(');
1664                 l2 = o_mklabel();
1665                 readexpr();
1666                 o_jnz(l1);
1667                 tok_expect(')');
1668                 break_fill(o_mklabel(), break_beg);
1669                 continue_fill(l2, continue_beg);
1670                 return;
1671         }
1672         if (!tok_jmp(TOK_FOR)) {
1673                 long l_check, l_jump, j_fail, j_pass;
1674                 int break_beg = nbreaks;
1675                 int continue_beg = ncontinues;
1676                 int has_cond = 0;
1677                 tok_expect('(');
1678                 if (tok_see() != ';')
1679                         readestmt();
1680                 tok_expect(';');
1681                 l_check = o_mklabel();
1682                 if (tok_see() != ';') {
1683                         readestmt();
1684                         j_fail = o_jz(0);
1685                         has_cond = 1;
1686                 }
1687                 tok_expect(';');
1688                 j_pass = o_jmp(0);
1689                 l_jump = o_mklabel();
1690                 if (tok_see() != ')')
1691                         readestmt();
1692                 tok_expect(')');
1693                 o_jmp(l_check);
1694                 o_filljmp(j_pass);
1695                 readstmt();
1696                 o_jmp(l_jump);
1697                 if (has_cond)
1698                         o_filljmp(j_fail);
1699                 break_fill(o_mklabel(), break_beg);
1700                 continue_fill(l_jump, continue_beg);
1701                 return;
1702         }
1703         if (!tok_jmp(TOK_SWITCH)) {
1704                 readswitch();
1705                 return;
1706         }
1707         if (!tok_jmp(TOK_RETURN)) {
1708                 int ret = tok_see() != ';';
1709                 if (ret)
1710                         readexpr();
1711                 tok_expect(';');
1712                 o_ret(ret_bt);
1713                 return;
1714         }
1715         if (!tok_jmp(TOK_BREAK)) {
1716                 tok_expect(';');
1717                 breaks[nbreaks++] = o_jmp(0);
1718                 return;
1719         }
1720         if (!tok_jmp(TOK_CONTINUE)) {
1721                 tok_expect(';');
1722                 continues[ncontinues++] = o_jmp(0);
1723                 return;
1724         }
1725         if (!tok_jmp(TOK_GOTO)) {
1726                 tok_expect(TOK_NAME);
1727                 goto_add(tok_id());
1728                 tok_expect(';');
1729                 return;
1730         }
1731         readestmt();
1732         /* labels */
1733         if (!tok_jmp(':')) {
1734                 label_add(tok_id());
1735                 return;
1736         }
1737         tok_expect(';');
1738 }
1739
1740 static void readdecl(void)
1741 {
1742         if (!tok_jmp(TOK_TYPEDEF)) {
1743                 readdefs(typedefdef, NULL);
1744                 tok_expect(';');
1745                 return;
1746         }
1747         readdefs(globaldef, NULL);
1748         if (tok_see() == '{') {
1749                 readstmt();
1750                 goto_fill();
1751                 o_func_end();
1752                 nlocals = 0;
1753                 ngotos = 0;
1754                 nlabels = 0;
1755                 return;
1756         }
1757         tok_expect(';');
1758 }
1759
1760 static void parse(void)
1761 {
1762         while (tok_see() != TOK_EOF)
1763                 readdecl();
1764 }
1765
1766 int main(int argc, char *argv[])
1767 {
1768         char obj[128];
1769         int ofd;
1770         int i = 1;
1771         while (i < argc && argv[i][0] == '-') {
1772                 if (argv[i][1] == 'I')
1773                         cpp_addpath(argv[i][2] ? argv[i] + 2 : argv[++i]);
1774                 if (argv[i][1] == 'D') {
1775                         char *name = argv[i] + 2;
1776                         char *def = "";
1777                         char *eq = strchr(name, '=');
1778                         if (eq) {
1779                                 *eq = '\0';
1780                                 def = eq + 1;
1781                         }
1782                         cpp_define(name, def);
1783                 }
1784                 i++;
1785         }
1786         if (i == argc)
1787                 die("neatcc: no file given\n");
1788         if (cpp_init(argv[i]))
1789                 die("neatcc: cannot open input file\n");
1790         parse();
1791         strcpy(obj, argv[i]);
1792         obj[strlen(obj) - 1] = 'o';
1793         ofd = open(obj, O_WRONLY | O_TRUNC | O_CREAT, 0600);
1794         out_write(ofd);
1795         close(ofd);
1796         return 0;
1797 }