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                 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_bop(O_MUL);
 328                 }
 329         o_bop(op);
 330         if (t1.ptr && t2.ptr) {
 331                 int sz = type_szde(&t1);
 332                 if (sz > 1) {
 333                         o_num(sz, 4);
 334                         o_bop(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(LONGSZ, 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(LONGSZ, 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 = LONGSZ;
 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 = LONGSZ;
 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(LONGSZ);
 578                 o_symaddr(unkn.addr, LONGSZ);
 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_bop(O_MUL);
 605         }
 606         o_bop(O_ADD);
 607         o_deref(TYPE_BT(t));
 608 }
 609
 610 static void inc_post(int inc_one, int inc_many)
 611 {
 612         struct type *t = &ts[nts - 1];
 613         int sz = type_szde(t);
 614         o_tmpcopy();
 615         o_load();
 616         o_tmpswap();
 617         if (!t->ptr || sz == 1) {
 618                 o_uop(inc_one);
 619         } else {
 620                 o_tmpcopy();
 621                 o_num(sz, 4);
 622                 o_bop(inc_many);
 623                 o_assign(TYPE_BT(t));
 624         }
 625         o_tmpdrop(1);
 626 }
 627
 628 static void readfield(void)
 629 {
 630         struct name *field;
 631         struct type t;
 632         tok_expect(TOK_NAME);
 633         ts_pop(&t);
 634         array2ptr(&t);
 635         field = struct_field(t.id, tok_id());
 636         if (field->addr) {
 637                 o_num(field->addr, 4);
 638                 o_bop(O_ADD);
 639         }
 640         o_deref(TYPE_BT(&field->type));
 641         ts_push(&field->type);
 642 }
 643
 644 #define MAXFUNCS                (1 << 10)
 645
 646 static struct funcinfo {
 647         struct type args[MAXFIELDS];
 648         struct type ret;
 649         int nargs;
 650 } funcs[MAXFUNCS];
 651 static int nfuncs;
 652 static unsigned ret_bt;
 653
 654 static int func_create(struct type *ret, struct name *args, int nargs)
 655 {
 656         struct funcinfo *fi = &funcs[nfuncs++];
 657         int i;
 658         if (nfuncs >= MAXFUNCS)
 659                 err("nomem: MAXFUNCS reached!\n");
 660         memcpy(&fi->ret, ret, sizeof(*ret));
 661         for (i = 0; i < nargs; i++)
 662                 memcpy(&fi->args[i], &args[i].type, sizeof(*ret));
 663         fi->nargs = nargs;
 664         return fi - funcs;
 665 }
 666
 667 static void readcall(void)
 668 {
 669         struct type t;
 670         unsigned bt[MAXARGS];
 671         struct funcinfo *fi;
 672         int argc = 0;
 673         int i;
 674         ts_pop(&t);
 675         if (t.flags & T_FUNC && t.ptr > 0)
 676                 o_deref(LONGSZ);
 677         fi = t.flags & T_FUNC ? &funcs[t.id] : NULL;
 678         if (tok_see() != ')') {
 679                 readexpr();
 680                 ts_pop(&t);
 681                 bt[argc++] = TYPE_BT(&t);
 682         }
 683         while (!tok_jmp(',')) {
 684                 readexpr();
 685                 ts_pop(&t);
 686                 bt[argc++] = TYPE_BT(&t);
 687         }
 688         tok_expect(')');
 689         if (fi)
 690                 for (i = 0; i < fi->nargs; i++)
 691                         bt[i] = TYPE_BT(&fi->args[i]);
 692         o_call(argc, bt, fi ? TYPE_BT(&fi->ret) : 4 | BT_SIGNED);
 693         if (fi)
 694                 ts_push(&fi->ret);
 695         else
 696                 ts_push_bt(4 | BT_SIGNED);
 697 }
 698
 699 static void readpost(void)
 700 {
 701         readprimary();
 702         while (1) {
 703                 if (!tok_jmp('[')) {
 704                         struct type t;
 705                         ts_pop(&t);
 706                         readexpr();
 707                         ts_pop(NULL);
 708                         tok_expect(']');
 709                         array2ptr(&t);
 710                         t.ptr--;
 711                         arrayderef(&t);
 712                         ts_push(&t);
 713                         continue;
 714                 }
 715                 if (!tok_jmp('(')) {
 716                         readcall();
 717                         continue;
 718                 }
 719                 if (!tok_jmp(TOK2("++"))) {
 720                         inc_post(O_INC, O_ADD);
 721                         continue;
 722                 }
 723                 if (!tok_jmp(TOK2("--"))) {
 724                         inc_post(O_DEC, O_SUB);
 725                         continue;
 726                 }
 727                 if (!tok_jmp('.')) {
 728                         o_addr();
 729                         readfield();
 730                         continue;
 731                 }
 732                 if (!tok_jmp(TOK2("->"))) {
 733                         readfield();
 734                         continue;
 735                 }
 736                 break;
 737         }
 738 }
 739
 740 static void inc_pre(int inc_one, int inc_many)
 741 {
 742         struct type t;
 743         int sz;
 744         readpre();
 745         ts_pop(&t);
 746         array2ptr(&t);
 747         sz = type_totsz(&t);
 748         if (!t.ptr || sz == 1) {
 749                 o_uop(inc_one);
 750         } else {
 751                 o_num(sz, 4);
 752                 o_bop(inc_many);
 753                 o_assign(TYPE_BT(&t));
 754         }
 755         ts_push(&t);
 756 }
 757
 758 static void readpre(void)
 759 {
 760         if (!tok_jmp('&')) {
 761                 struct type type;
 762                 readpre();
 763                 ts_pop(&type);
 764                 if (!(type.flags & T_FUNC) && !type.ptr)
 765                         type.ptr++;
 766                 ts_push(&type);
 767                 o_addr();
 768                 return;
 769         }
 770         if (!tok_jmp('*')) {
 771                 struct type t;
 772                 readpre();
 773                 ts_pop(&t);
 774                 array2ptr(&t);
 775                 if (!(t.flags & T_FUNC) || t.ptr > 0) {
 776                         t.ptr--;
 777                         o_deref(TYPE_BT(&t));
 778                 }
 779                 ts_push(&t);
 780                 return;
 781         }
 782         if (!tok_jmp('!')) {
 783                 struct type type;
 784                 readpre();
 785                 ts_pop(&type);
 786                 o_uop(O_LNOT);
 787                 ts_push_bt(4 | BT_SIGNED);
 788                 return;
 789         }
 790         if (!tok_jmp('-')) {
 791                 readpre();
 792                 o_uop(O_NEG);
 793                 return;
 794         }
 795         if (!tok_jmp('~')) {
 796                 readpre();
 797                 o_uop(O_NOT);
 798                 return;
 799         }
 800         if (!tok_jmp(TOK2("++"))) {
 801                 inc_pre(O_INC, O_ADD);
 802                 return;
 803         }
 804         if (!tok_jmp(TOK2("--"))) {
 805                 inc_pre(O_DEC, O_SUB);
 806                 return;
 807         }
 808         if (!tok_jmp(TOK_SIZEOF)) {
 809                 struct type t;
 810                 int op = !tok_jmp('(');
 811                 if (readtype(&t)) {
 812                         int nogen = !o_nogen();
 813                         readexpr();
 814                         if (nogen)
 815                                 o_dogen();
 816                         ts_pop(&t);
 817                         o_tmpdrop(1);
 818                 }
 819                 ts_push_bt(4);
 820                 o_num(type_totsz(&t), 4);
 821                 if (op)
 822                         tok_expect(')');
 823                 return;
 824         }
 825         readpost();
 826 }
 827
 828 static void readmul(void)
 829 {
 830         readpre();
 831         while (1) {
 832                 if (!tok_jmp('*')) {
 833                         readpre();
 834                         ts_binop(O_MUL);
 835                         continue;
 836                 }
 837                 if (!tok_jmp('/')) {
 838                         readpre();
 839                         ts_binop(O_DIV);
 840                         continue;
 841                 }
 842                 if (!tok_jmp('%')) {
 843                         readpre();
 844                         ts_binop(O_MOD);
 845                         continue;
 846                 }
 847                 break;
 848         }
 849 }
 850
 851 static void readadd(void)
 852 {
 853         readmul();
 854         while (1) {
 855                 if (!tok_jmp('+')) {
 856                         readmul();
 857                         ts_addop(O_ADD);
 858                         continue;
 859                 }
 860                 if (!tok_jmp('-')) {
 861                         readmul();
 862                         ts_addop(O_SUB);
 863                         continue;
 864                 }
 865                 break;
 866         }
 867 }
 868
 869 static void shift(int op)
 870 {
 871         struct type t;
 872         readadd();
 873         ts_pop(NULL);
 874         ts_pop(&t);
 875         o_bop(op);
 876         ts_push_bt(TYPE_BT(&t));
 877 }
 878
 879 static void readshift(void)
 880 {
 881         readadd();
 882         while (1) {
 883                 if (!tok_jmp(TOK2("<<"))) {
 884                         shift(O_SHL);
 885                         continue;
 886                 }
 887                 if (!tok_jmp(TOK2(">>"))) {
 888                         shift(O_SHR);
 889                         continue;
 890                 }
 891                 break;
 892         }
 893 }
 894
 895 static void cmp(int op)
 896 {
 897         readshift();
 898         ts_pop(NULL);
 899         ts_pop(NULL);
 900         o_bop(op);
 901         ts_push_bt(4 | BT_SIGNED);
 902 }
 903
 904 static void readcmp(void)
 905 {
 906         readshift();
 907         while (1) {
 908                 if (!tok_jmp('<')) {
 909                         cmp(O_LT);
 910                         continue;
 911                 }
 912                 if (!tok_jmp('>')) {
 913                         cmp(O_GT);
 914                         continue;
 915                 }
 916                 if (!tok_jmp(TOK2("<="))) {
 917                         cmp(O_LE);
 918                         continue;
 919                 }
 920                 if (!tok_jmp(TOK2(">="))) {
 921                         cmp(O_GE);
 922                         continue;
 923                 }
 924                 break;
 925         }
 926 }
 927
 928 static void eq(int op)
 929 {
 930         readcmp();
 931         ts_pop(NULL);
 932         ts_pop(NULL);
 933         o_bop(op);
 934         ts_push_bt(4 | BT_SIGNED);
 935 }
 936
 937 static void readeq(void)
 938 {
 939         readcmp();
 940         while (1) {
 941                 if (!tok_jmp(TOK2("=="))) {
 942                         eq(O_EQ);
 943                         continue;
 944                 }
 945                 if (!tok_jmp(TOK2("!="))) {
 946                         eq(O_NEQ);
 947                         continue;
 948                 }
 949                 break;
 950         }
 951 }
 952
 953 static void readbitand(void)
 954 {
 955         readeq();
 956         while (!tok_jmp('&')) {
 957                 readeq();
 958                 ts_binop(O_AND);
 959         }
 960 }
 961
 962 static void readxor(void)
 963 {
 964         readbitand();
 965         while (!tok_jmp('^')) {
 966                 readbitand();
 967                 ts_binop(O_XOR);
 968         }
 969 }
 970
 971 static void readbitor(void)
 972 {
 973         readxor();
 974         while (!tok_jmp('|')) {
 975                 readxor();
 976                 ts_binop(O_OR);
 977         }
 978 }
 979
 980 #define MAXCOND                 (1 << 7)
 981
 982 static void readand(void)
 983 {
 984         long conds[MAXCOND];
 985         int nconds = 0;
 986         long passed;
 987         int i;
 988         readbitor();
 989         if (tok_see() != TOK2("&&"))
 990                 return;
 991         o_fork();
 992         conds[nconds++] = o_jz(0);
 993         ts_pop(NULL);
 994         while (!tok_jmp(TOK2("&&"))) {
 995                 readbitor();
 996                 conds[nconds++] = o_jz(0);
 997                 ts_pop(NULL);
 998         }
 999         o_num(1, 4 | BT_SIGNED);
1000         o_forkpush();
1001         passed = o_jmp(0);
1002         for (i = 0; i < nconds; i++)
1003                 o_filljmp(conds[i]);
1004         o_num(0, 4 | BT_SIGNED);
1005         o_forkpush();
1006         o_forkjoin();
1007         o_filljmp(passed);
1008         ts_push_bt(4 | BT_SIGNED);
1009 }
1010
1011 static void reador(void)
1012 {
1013         long conds[MAXCOND];
1014         int nconds = 0;
1015         long failed;
1016         int i;
1017         readand();
1018         if (tok_see() != TOK2("||"))
1019                 return;
1020         o_fork();
1021         conds[nconds++] = o_jnz(0);
1022         ts_pop(NULL);
1023         while (!tok_jmp(TOK2("||"))) {
1024                 readand();
1025                 conds[nconds++] = o_jnz(0);
1026                 ts_pop(NULL);
1027         }
1028         o_num(0, 4 | BT_SIGNED);
1029         o_forkpush();
1030         failed = o_jmp(0);
1031         for (i = 0; i < nconds; i++)
1032                 o_filljmp(conds[i]);
1033         o_num(1, 4 | BT_SIGNED);
1034         o_forkpush();
1035         o_forkjoin();
1036         o_filljmp(failed);
1037         ts_push_bt(4 | BT_SIGNED);
1038 }
1039
1040 static int readcexpr_const(void)
1041 {
1042         long c;
1043         int nogen;
1044         if (o_popnum(&c))
1045                 return -1;
1046         if (!c)
1047                 nogen = !o_nogen();
1048         reador();
1049         ts_pop(NULL);
1050         tok_expect(':');
1051         if (c) {
1052                 nogen = !o_nogen();
1053         } else {
1054                 if (nogen)
1055                         o_dogen();
1056                 o_tmpdrop(1);
1057         }
1058         reador();
1059         if (c) {
1060                 if (nogen)
1061                         o_dogen();
1062                 o_tmpdrop(1);
1063         }
1064         return 0;
1065 }
1066
1067 static void readcexpr(void)
1068 {
1069         long l1, l2;
1070         reador();
1071         if (tok_jmp('?'))
1072                 return;
1073         ncexpr++;
1074         ts_pop(NULL);
1075         o_fork();
1076         if (readcexpr_const()) {
1077                 l1 = o_jz(0);
1078                 reador();
1079                 o_forkpush();
1080                 l2 = o_jmp(0);
1081                 ts_pop(NULL);
1082
1083                 tok_expect(':');
1084                 o_filljmp(l1);
1085                 reador();
1086                 o_forkpush();
1087                 o_forkjoin();
1088                 o_filljmp(l2);
1089         }
1090         ncexpr--;
1091 }
1092
1093 static void opassign(int op, int ptrop)
1094 {
1095         struct type *t = &ts[nts - 1];
1096         if (ptrop && (t->flags & T_ARRAY || t->ptr)) {
1097                 o_tmpcopy();
1098                 readexpr();
1099                 ts_addop(op);
1100                 ts_pop(NULL);
1101                 o_assign(TYPE_BT(&ts[nts - 1]));
1102         } else {
1103                 readexpr();
1104                 o_bop(op | O_SET);
1105                 ts_pop(NULL);
1106         }
1107 }
1108
1109 static void doassign(void)
1110 {
1111         struct type t;
1112         ts_pop(&t);
1113         if (!t.ptr && t.flags & T_STRUCT)
1114                 o_memcpy(type_totsz(&t));
1115         else
1116                 o_assign(TYPE_BT(&ts[nts - 1]));
1117 }
1118
1119 static void readexpr(void)
1120 {
1121         readcexpr();
1122         if (!tok_jmp('=')) {
1123                 readexpr();
1124                 doassign();
1125                 return;
1126         }
1127         if (!tok_jmp(TOK2("+="))) {
1128                 opassign(O_ADD, 1);
1129                 return;
1130         }
1131         if (!tok_jmp(TOK2("-="))) {
1132                 opassign(O_SUB, 1);
1133                 return;
1134         }
1135         if (!tok_jmp(TOK2("*="))) {
1136                 opassign(O_MUL, 0);
1137                 return;
1138         }
1139         if (!tok_jmp(TOK2("/="))) {
1140                 opassign(O_DIV, 0);
1141                 return;
1142         }
1143         if (!tok_jmp(TOK2("%="))) {
1144                 opassign(O_MOD, 0);
1145                 return;
1146         }
1147         if (!tok_jmp(TOK3("<<="))) {
1148                 opassign(O_SHL, 0);
1149                 return;
1150         }
1151         if (!tok_jmp(TOK3(">>="))) {
1152                 opassign(O_SHR, 0);
1153                 return;
1154         }
1155         if (!tok_jmp(TOK3("&="))) {
1156                 opassign(O_AND, 0);
1157                 return;
1158         }
1159         if (!tok_jmp(TOK3("|="))) {
1160                 opassign(O_OR, 0);
1161                 return;
1162         }
1163         if (!tok_jmp(TOK3("^="))) {
1164                 opassign(O_XOR, 0);
1165                 return;
1166         }
1167 }
1168
1169 static void readestmt(void)
1170 {
1171         do {
1172                 o_tmpdrop(-1);
1173                 nts = 0;
1174                 readexpr();
1175         } while (!tok_jmp(','));
1176 }
1177
1178 static void o_localoff(long addr, int off, unsigned bt)
1179 {
1180         o_local(addr, bt);
1181         if (off) {
1182                 o_addr();
1183                 o_num(off, 4);
1184                 o_bop(O_ADD);
1185                 o_deref(bt);
1186         }
1187 }
1188
1189 static struct type *innertype(struct type *t)
1190 {
1191         if (t->flags & T_ARRAY && !t->ptr)
1192                 return innertype(&arrays[t->id].type);
1193         return t;
1194 }
1195
1196 static void initexpr(struct type *t, int off, void *obj,
1197                 void (*set)(void *obj, int off, struct type *t))
1198 {
1199         if (tok_jmp('{')) {
1200                 set(obj, off, t);
1201                 return;
1202         }
1203         if (!t->ptr && t->flags & T_STRUCT) {
1204                 struct structinfo *si = &structs[t->id];
1205                 int i;
1206                 for (i = 0; i < si->nfields; i++) {
1207                         struct name *field = &si->fields[i];
1208                         if (!tok_jmp('.')) {
1209                                 tok_expect(TOK_NAME);
1210                                 field = struct_field(t->id, tok_id());
1211                                 tok_expect('=');
1212                         }
1213                         initexpr(&field->type, off + field->addr, obj, set);
1214                         if (tok_jmp(',') || tok_see() == '}')
1215                                 break;
1216                 }
1217         } else if (t->flags & T_ARRAY) {
1218                 struct type *t_de = &arrays[t->id].type;
1219                 int i;
1220                 for (i = 0; ; i++) {
1221                         long idx = i;
1222                         struct type *it = t_de;
1223                         if (!tok_jmp('[')) {
1224                                 readexpr();
1225                                 o_popnum(&idx);
1226                                 ts_pop(NULL);
1227                                 tok_expect(']');
1228                                 tok_expect('=');
1229                         }
1230                         if (tok_see() != '{')
1231                                 it = innertype(t_de);
1232                         initexpr(it, off + type_totsz(it) * idx, obj, set);
1233                         if (tok_jmp(',') || tok_see() == '}')
1234                                 break;
1235                 }
1236         }
1237         tok_expect('}');
1238 }
1239
1240 static void jumpbrace(void)
1241 {
1242         int depth = 0;
1243         while (tok_see() != '}' || depth--)
1244                 if (tok_get() == '{')
1245                         depth++;
1246         tok_expect('}');
1247 }
1248
1249 static int initsize(void)
1250 {
1251         long addr = tok_addr();
1252         int n = 0;
1253         if (!tok_jmp(TOK_STR)) {
1254                 n = tok_str(NULL);
1255                 tok_jump(addr);
1256                 return n;
1257         }
1258         o_nogen();
1259         tok_expect('{');
1260         while (tok_jmp('}')) {
1261                 long idx = n;
1262                 if (!tok_jmp('[')) {
1263                         readexpr();
1264                         o_popnum(&idx);
1265                         ts_pop(NULL);
1266                         tok_expect(']');
1267                         tok_expect('=');
1268                 }
1269                 if (n < idx + 1)
1270                         n = idx + 1;
1271                 while (tok_see() != '}' && tok_see() != ',')
1272                         if (tok_get() == '{')
1273                                 jumpbrace();
1274                 tok_jmp(',');
1275         }
1276         o_dogen();
1277         tok_jump(addr);
1278         return n;
1279 }
1280
1281 #define F_GLOBAL(flags)         (!((flags) & F_STATIC))
1282
1283 static void globalinit(void *obj, int off, struct type *t)
1284 {
1285         long addr = *(long *) obj;
1286         if (t->flags & T_ARRAY && tok_see() == TOK_STR) {
1287                 struct type *t_de = &arrays[t->id].type;
1288                 if (!t_de->ptr && !t_de->flags && TYPE_SZ(t_de) == 1) {
1289                         char buf[BUFSIZE];
1290                         int len;
1291                         tok_expect(TOK_STR);
1292                         len = tok_str(buf);
1293                         out_datcpy(addr, off, buf, len);
1294                         return;
1295                 }
1296         }
1297         readexpr();
1298         o_datset(addr, off, TYPE_BT(t));
1299         ts_pop(NULL);
1300 }
1301
1302 static void globaldef(void *data, struct name *name, unsigned flags)
1303 {
1304         struct type *t = &name->type;
1305         char *varname = flags & F_STATIC ? NULL : name->name;
1306         int sz;
1307         if (t->flags & T_ARRAY && !t->ptr && !arrays[t->id].n)
1308                 arrays[t->id].n = initsize();
1309         sz = type_totsz(t);
1310         if (flags & F_EXTERN || t->flags & T_FUNC && !t->ptr)
1311                 name->unused = 1;
1312         else if (flags & F_INIT)
1313                 name->addr = out_mkdat(varname, NULL, sz, F_GLOBAL(flags));
1314         else
1315                 name->addr = out_mkvar(varname, sz, F_GLOBAL(flags));
1316         global_add(name);
1317         if (flags & F_INIT)
1318                 initexpr(t, 0, &name->addr, globalinit);
1319 }
1320
1321 static void localinit(void *obj, int off, struct type *t)
1322 {
1323         long addr = *(long *) obj;
1324         if (t->flags & T_ARRAY && tok_see() == TOK_STR) {
1325                 struct type *t_de = &arrays[t->id].type;
1326                 if (!t_de->ptr && !t_de->flags && TYPE_SZ(t_de) == 1) {
1327                         char buf[BUFSIZE];
1328                         int len;
1329                         tok_expect(TOK_STR);
1330                         len = tok_str(buf);
1331                         o_localoff(addr, off, TYPE_BT(t));
1332                         o_symaddr(out_mkdat(NULL, buf, len, 0), TYPE_BT(t));
1333                         o_memcpy(len);
1334                         o_tmpdrop(1);
1335                         return;
1336                 }
1337         }
1338         o_localoff(addr, off, TYPE_BT(t));
1339         ts_push(t);
1340         readexpr();
1341         doassign();
1342         ts_pop(NULL);
1343         o_tmpdrop(1);
1344 }
1345
1346 static void localdef(void *data, struct name *name, unsigned flags)
1347 {
1348         struct type *t = &name->type;
1349         if (flags & (F_STATIC | F_EXTERN)) {
1350                 globaldef(data, name, flags);
1351                 return;
1352         }
1353         if (t->flags & T_ARRAY && !t->ptr && !arrays[t->id].n)
1354                 arrays[t->id].n = initsize();
1355         name->addr = o_mklocal(type_totsz(&name->type));
1356         local_add(name);
1357         if (flags & F_INIT) {
1358                 if (t->flags & (T_ARRAY | T_STRUCT) && !t->ptr) {
1359                         o_local(name->addr, TYPE_BT(t));
1360                         o_memset(0, type_totsz(t));
1361                         o_tmpdrop(1);
1362                 }
1363                 initexpr(t, 0, &name->addr, localinit);
1364         }
1365 }
1366
1367 static void funcdef(char *name, struct type *type, struct name *args,
1368                         int nargs, unsigned flags)
1369 {
1370         struct name global;
1371         int i;
1372         strcpy(global.name, name);
1373         memcpy(&global.type, type, sizeof(*type));
1374         global.addr = o_func_beg(name, F_GLOBAL(flags));
1375         global.unused = 0;
1376         global_add(&global);
1377         ret_bt = TYPE_BT(&funcs[type->id].ret);
1378         for (i = 0; i < nargs; i++) {
1379                 args[i].addr = o_arg(i, type_totsz(&args[i].type));
1380                 local_add(&args[i]);
1381         }
1382 }
1383
1384 static int readargs(struct name *args)
1385 {
1386         int nargs = 0;
1387         tok_expect('(');
1388         while (tok_see() != ')') {
1389                 if (!tok_jmp(TOK3("...")))
1390                         break;
1391                 readname(&args[nargs].type, args[nargs].name, NULL, 0);
1392                 array2ptr(&args[nargs].type);
1393                 nargs++;
1394                 if (tok_jmp(','))
1395                         break;
1396         }
1397         tok_expect(')');
1398         if (nargs == 1 && !TYPE_BT(&args[0].type))
1399                 return 0;
1400         return nargs;
1401 }
1402
1403 static int readname(struct type *main, char *name,
1404                         struct type *base, unsigned flags)
1405 {
1406         struct type tpool[3];
1407         int npool = 0;
1408         struct type *type = &tpool[npool++];
1409         struct type *func = NULL;
1410         struct type *ret = NULL;
1411         int arsz[10];
1412         int nar = 0;
1413         int i;
1414         memset(tpool, 0, sizeof(tpool));
1415         if (name)
1416                 *name = '\0';
1417         if (!base) {
1418                 if (basetype(type, &flags))
1419                         return 1;
1420         } else {
1421                 memcpy(type, base, sizeof(*base));
1422         }
1423         readptrs(type);
1424         if (!tok_jmp('(')) {
1425                 ret = type;
1426                 type = &tpool[npool++];
1427                 func = type;
1428                 readptrs(type);
1429         }
1430         if (!tok_jmp(TOK_NAME) && name)
1431                 strcpy(name, tok_id());
1432         while (!tok_jmp('[')) {
1433                 long n = 0;
1434                 if (tok_jmp(']')) {
1435                         readexpr();
1436                         ts_pop(NULL);
1437                         if (o_popnum(&n))
1438                                 err("const expr expected\n");
1439                         tok_expect(']');
1440                 }
1441                 arsz[nar++] = n;
1442         }
1443         for (i = nar - 1; i >= 0; i--) {
1444                 type->id = array_add(type, arsz[i]);
1445                 if (type->flags & T_FUNC)
1446                         func = &arrays[type->id].type;
1447                 type->flags = T_ARRAY;
1448                 type->bt = LONGSZ;
1449                 type->ptr = 0;
1450         }
1451         if (func)
1452                 tok_expect(')');
1453         if (tok_see() == '(') {
1454                 struct name args[MAXARGS];
1455                 int nargs = readargs(args);
1456                 int fdef = !func;
1457                 if (!func) {
1458                         ret = type;
1459                         type = &tpool[npool++];
1460                         func = type;
1461                 }
1462                 func->flags = T_FUNC;
1463                 func->bt = LONGSZ;
1464                 func->id = func_create(ret, args, nargs);
1465                 if (fdef && tok_see() == '{') {
1466                         funcdef(name, func, args, nargs, flags);
1467                         return 1;
1468                 }
1469         }
1470         memcpy(main, type, sizeof(*type));
1471         return 0;
1472 }
1473
1474 static int readdefs(void (*def)(void *data, struct name *name, unsigned flags),
1475                         void *data)
1476 {
1477         struct type base;
1478         unsigned flags;
1479         if (basetype(&base, &flags))
1480                 return 1;
1481         while (tok_see() != ';' && tok_see() != '{') {
1482                 struct name name;
1483                 name.unused = 0;
1484                 if (readname(&name.type, name.name, &base, flags))
1485                         break;
1486                 if (!tok_jmp('='))
1487                         flags |= F_INIT;
1488                 def(data, &name, flags);
1489                 tok_jmp(',');
1490         }
1491         return 0;
1492 }
1493
1494 static void typedefdef(void *data, struct name *name, unsigned flags)
1495 {
1496         typedef_add(name->name, &name->type);
1497 }
1498
1499 static void readstmt(void);
1500
1501 #define MAXCASES                (1 << 7)
1502
1503 static void readswitch(void)
1504 {
1505         int break_beg = nbreaks;
1506         long val_addr = o_mklocal(LONGSZ);
1507         long matched[MAXCASES];
1508         int nmatched = 0;
1509         struct type t;
1510         long next;
1511         int ref = 1;
1512         int i;
1513         tok_expect('(');
1514         readexpr();
1515         ts_pop(&t);
1516         o_local(val_addr, TYPE_BT(&t));
1517         o_tmpswap();
1518         o_assign(TYPE_BT(&t));
1519         o_tmpdrop(1);
1520         tok_expect(')');
1521         tok_expect('{');
1522         while (tok_jmp('}')) {
1523                 int n = 0;
1524                 while (tok_see() == TOK_CASE || tok_see() == TOK_DEFAULT) {
1525                         if (n++ > 0)
1526                                 matched[nmatched++] = o_jmp(0);
1527                         if (!ref++)
1528                                 o_filljmp(next);
1529                         if (!tok_jmp(TOK_CASE)) {
1530                                 caseexpr = 1;
1531                                 readexpr();
1532                                 caseexpr = 0;
1533                                 o_local(val_addr, TYPE_BT(&t));
1534                                 o_bop(O_EQ);
1535                                 next = o_jz(0);
1536                                 ref = 0;
1537                                 tok_expect(':');
1538                                 o_tmpdrop(1);
1539                                 ts_pop(NULL);
1540                                 continue;
1541                         }
1542                         if (!tok_jmp(TOK_DEFAULT)) {
1543                                 tok_expect(':');
1544                                 continue;
1545                         }
1546                 }
1547                 for (i = 0; i < nmatched; i++)
1548                         o_filljmp(matched[i]);
1549                 nmatched = 0;
1550                 readstmt();
1551         }
1552         o_rmlocal(val_addr, LONGSZ);
1553         if (!ref++)
1554                 o_filljmp(next);
1555         break_fill(o_mklabel(), break_beg);
1556 }
1557
1558 #define MAXGOTO                 (1 << 10)
1559
1560 static struct gotoinfo {
1561         char name[NAMELEN];
1562         long addr;
1563 } gotos[MAXGOTO];
1564 static int ngotos;
1565
1566 static struct labelinfo {
1567         char name[NAMELEN];
1568         long addr;
1569 } labels[MAXGOTO];
1570 static int nlabels;
1571
1572 static void goto_add(char *name)
1573 {
1574         strcpy(gotos[ngotos].name, name);
1575         gotos[ngotos++].addr = o_jmp(0);
1576 }
1577
1578 static void label_add(char *name)
1579 {
1580         strcpy(labels[nlabels].name, name);
1581         labels[nlabels++].addr = o_mklabel();
1582 }
1583
1584 static void goto_fill(void)
1585 {
1586         int i, j;
1587         for (i = 0; i < ngotos; i++)
1588                 for (j = 0; j < nlabels; j++)
1589                         if (!strcmp(gotos[i].name, labels[j].name)) {
1590                                 o_filljmp2(gotos[i].addr, labels[j].addr);
1591                                 break;
1592                         }
1593 }
1594
1595 static void readstmt(void)
1596 {
1597         o_tmpdrop(-1);
1598         nts = 0;
1599         if (!tok_jmp('{')) {
1600                 int _nlocals = nlocals;
1601                 int _nglobals = nglobals;
1602                 int _nenums = nenums;
1603                 int _ntypedefs = ntypedefs;
1604                 int _nstructs = nstructs;
1605                 int _nfuncs = nfuncs;
1606                 int _narrays = narrays;
1607                 while (tok_jmp('}'))
1608                         readstmt();
1609                 nlocals = _nlocals;
1610                 nenums = _nenums;
1611                 ntypedefs = _ntypedefs;
1612                 nstructs = _nstructs;
1613                 nfuncs = _nfuncs;
1614                 narrays = _narrays;
1615                 nglobals = _nglobals;
1616                 return;
1617         }
1618         if (!readdefs(localdef, NULL)) {
1619                 tok_expect(';');
1620                 return;
1621         }
1622         if (!tok_jmp(TOK_TYPEDEF)) {
1623                 readdefs(typedefdef, NULL);
1624                 tok_expect(';');
1625                 return;
1626         }
1627         if (!tok_jmp(TOK_IF)) {
1628                 long l1, l2;
1629                 tok_expect('(');
1630                 readexpr();
1631                 tok_expect(')');
1632                 l1 = o_jz(0);
1633                 readstmt();
1634                 if (!tok_jmp(TOK_ELSE)) {
1635                         l2 = o_jmp(0);
1636                         o_filljmp(l1);
1637                         readstmt();
1638                         o_filljmp(l2);
1639                 } else {
1640                         o_filljmp(l1);
1641                 }
1642                 return;
1643         }
1644         if (!tok_jmp(TOK_WHILE)) {
1645                 long l1, l2;
1646                 int break_beg = nbreaks;
1647                 int continue_beg = ncontinues;
1648                 l1 = o_mklabel();
1649                 tok_expect('(');
1650                 readexpr();
1651                 tok_expect(')');
1652                 l2 = o_jz(0);
1653                 readstmt();
1654                 o_jmp(l1);
1655                 o_filljmp(l2);
1656                 break_fill(o_mklabel(), break_beg);
1657                 continue_fill(l1, continue_beg);
1658                 return;
1659         }
1660         if (!tok_jmp(TOK_DO)) {
1661                 long l1, l2;
1662                 int break_beg = nbreaks;
1663                 int continue_beg = ncontinues;
1664                 l1 = o_mklabel();
1665                 readstmt();
1666                 tok_expect(TOK_WHILE);
1667                 tok_expect('(');
1668                 l2 = o_mklabel();
1669                 readexpr();
1670                 o_jnz(l1);
1671                 tok_expect(')');
1672                 break_fill(o_mklabel(), break_beg);
1673                 continue_fill(l2, continue_beg);
1674                 return;
1675         }
1676         if (!tok_jmp(TOK_FOR)) {
1677                 long l_check, l_jump, j_fail, j_pass;
1678                 int break_beg = nbreaks;
1679                 int continue_beg = ncontinues;
1680                 int has_cond = 0;
1681                 tok_expect('(');
1682                 if (tok_see() != ';')
1683                         readestmt();
1684                 tok_expect(';');
1685                 l_check = o_mklabel();
1686                 if (tok_see() != ';') {
1687                         readestmt();
1688                         j_fail = o_jz(0);
1689                         has_cond = 1;
1690                 }
1691                 tok_expect(';');
1692                 j_pass = o_jmp(0);
1693                 l_jump = o_mklabel();
1694                 if (tok_see() != ')')
1695                         readestmt();
1696                 tok_expect(')');
1697                 o_jmp(l_check);
1698                 o_filljmp(j_pass);
1699                 readstmt();
1700                 o_jmp(l_jump);
1701                 if (has_cond)
1702                         o_filljmp(j_fail);
1703                 break_fill(o_mklabel(), break_beg);
1704                 continue_fill(l_jump, continue_beg);
1705                 return;
1706         }
1707         if (!tok_jmp(TOK_SWITCH)) {
1708                 readswitch();
1709                 return;
1710         }
1711         if (!tok_jmp(TOK_RETURN)) {
1712                 int ret = tok_see() != ';';
1713                 if (ret)
1714                         readexpr();
1715                 tok_expect(';');
1716                 o_ret(ret_bt);
1717                 return;
1718         }
1719         if (!tok_jmp(TOK_BREAK)) {
1720                 tok_expect(';');
1721                 breaks[nbreaks++] = o_jmp(0);
1722                 return;
1723         }
1724         if (!tok_jmp(TOK_CONTINUE)) {
1725                 tok_expect(';');
1726                 continues[ncontinues++] = o_jmp(0);
1727                 return;
1728         }
1729         if (!tok_jmp(TOK_GOTO)) {
1730                 tok_expect(TOK_NAME);
1731                 goto_add(tok_id());
1732                 tok_expect(';');
1733                 return;
1734         }
1735         readestmt();
1736         /* labels */
1737         if (!tok_jmp(':')) {
1738                 label_add(tok_id());
1739                 return;
1740         }
1741         tok_expect(';');
1742 }
1743
1744 static void readdecl(void)
1745 {
1746         if (!tok_jmp(TOK_TYPEDEF)) {
1747                 readdefs(typedefdef, NULL);
1748                 tok_expect(';');
1749                 return;
1750         }
1751         readdefs(globaldef, NULL);
1752         if (tok_see() == '{') {
1753                 readstmt();
1754                 goto_fill();
1755                 o_func_end();
1756                 nlocals = 0;
1757                 ngotos = 0;
1758                 nlabels = 0;
1759                 return;
1760         }
1761         tok_expect(';');
1762 }
1763
1764 static void parse(void)
1765 {
1766         while (tok_see() != TOK_EOF)
1767                 readdecl();
1768 }
1769
1770 int main(int argc, char *argv[])
1771 {
1772         char obj[128];
1773         int ofd;
1774         int i = 1;
1775         while (i < argc && argv[i][0] == '-') {
1776                 if (argv[i][1] == 'I')
1777                         cpp_addpath(argv[i][2] ? argv[i] + 2 : argv[++i]);
1778                 if (argv[i][1] == 'D') {
1779                         char *name = argv[i] + 2;
1780                         char *def = "";
1781                         char *eq = strchr(name, '=');
1782                         if (eq) {
1783                                 *eq = '\0';
1784                                 def = eq + 1;
1785                         }
1786                         cpp_define(name, def);
1787                 }
1788                 i++;
1789         }
1790         if (i == argc)
1791                 die("neatcc: no file given\n");
1792         if (cpp_init(argv[i]))
1793                 die("neatcc: cannot open input file\n");
1794         parse();
1795         strcpy(obj, argv[i]);
1796         obj[strlen(obj) - 1] = 'o';
1797         ofd = open(obj, O_WRONLY | O_TRUNC | O_CREAT, 0600);
1798         out_write(ofd);
1799         close(ofd);
1800         return 0;
1801 }