ncc.c

   1 /*
   2  * neatcc - A small and simple x86_64 C compiler
   3  *
   4  * Copyright (C) 2010 Ali Gholami Rudi
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License, as published by the
   8  * Free Software Foundation.
   9  */
  10 #include <fcntl.h>
  11 #include <unistd.h>
  12 #include <stdlib.h>
  13 #include <string.h>
  14 #include <sys/stat.h>
  15 #include <sys/types.h>
  16 #include "gen.h"
  17 #include "tok.h"
  18
  19 #define MAXLOCALS       (1 << 10)
  20 #define MAXGLOBALS      (1 << 10)
  21 #define MAXARGS         (1 << 5)
  22 #define print(s)        write(2, (s), strlen(s));
  23
  24 #define TYPE_BT(t)              ((t)->ptr ? 8 : (t)->bt)
  25 #define TYPE_SZ(t)              ((t)->ptr ? 8 : (t)->bt & BT_SZMASK)
  26
  27 #define T_ARRAY         0x01
  28 #define T_STRUCT        0x02
  29 #define T_FUNC          0x04
  30
  31 #define F_INIT          0x01
  32 #define F_STATIC        0x02
  33 #define F_EXTERN        0x04
  34
  35 struct type {
  36         unsigned bt;
  37         unsigned flags;
  38         int ptr;
  39         int id;         /* for structs, functions and arrays */
  40 };
  41
  42 /* type stack */
  43 static struct type ts[MAXTMP];
  44 static int nts;
  45
  46 static void ts_push_bt(unsigned bt)
  47 {
  48         ts[nts].ptr = 0;
  49         ts[nts].flags = 0;
  50         ts[nts++].bt = bt;
  51 }
  52
  53 static void ts_push(struct type *t)
  54 {
  55         memcpy(&ts[nts++], t, sizeof(*t));
  56         if (t->flags & (T_FUNC | T_ARRAY) && !t->ptr)
  57                 o_addr();
  58 }
  59
  60 static void ts_pop(struct type *type)
  61 {
  62         nts--;
  63         if (type)
  64                 *type = ts[nts];
  65 }
  66
  67 void die(char *msg)
  68 {
  69         print(msg);
  70         exit(1);
  71 }
  72
  73 void err(char *msg)
  74 {
  75         char err[1 << 7];
  76         int len = cpp_loc(err, tok_addr());
  77         strcpy(err + len, msg);
  78         die(err);
  79 }
  80
  81 struct name {
  82         char name[NAMELEN];
  83         struct type type;
  84         long addr;
  85         int unused;             /* unreferenced external symbols */
  86 };
  87
  88 static struct name locals[MAXLOCALS];
  89 static int nlocals;
  90 static struct name globals[MAXGLOBALS];
  91 static int nglobals;
  92
  93 static void local_add(struct name *name)
  94 {
  95         if (nlocals >= MAXLOCALS)
  96                 err("nomem: MAXLOCALS reached!\n");
  97         memcpy(&locals[nlocals++], name, sizeof(*name));
  98 }
  99
 100 static int global_find(char *name)
 101 {
 102         int i;
 103         for (i = 0; i < nglobals; i++)
 104                 if (!strcmp(name, globals[i].name))
 105                         return i;
 106         return -1;
 107 }
 108
 109 static void global_add(struct name *name)
 110 {
 111         int found = global_find(name->name);
 112         int i = found == -1 ? nglobals++ : found;
 113         if (nglobals >= MAXGLOBALS)
 114                 err("nomem: MAXGLOBALS reached!\n");
 115         memcpy(&globals[i], name, sizeof(*name));
 116 }
 117
 118 #define MAXENUMS                (1 << 10)
 119
 120 static struct enumval {
 121         char name[NAMELEN];
 122         int n;
 123 } enums[MAXENUMS];
 124 static int nenums;
 125
 126 static void enum_add(char *name, int val)
 127 {
 128         struct enumval *ev = &enums[nenums++];
 129         if (nenums >= MAXENUMS)
 130                 err("nomem: MAXENUMS reached!\n");
 131         strcpy(ev->name, name);
 132         ev->n = val;
 133 }
 134
 135 static int enum_find(int *val, char *name)
 136 {
 137         int i;
 138         for (i = nenums - 1; i >= 0; --i)
 139                 if (!strcmp(name, enums[i].name)) {
 140                         *val = enums[i].n;
 141                         return 0;
 142                 }
 143         return 1;
 144 }
 145
 146 #define MAXTYPEDEFS             (1 << 10)
 147
 148 static struct typdefinfo {
 149         char name[NAMELEN];
 150         struct type type;
 151 } typedefs[MAXTYPEDEFS];
 152 static int ntypedefs;
 153
 154 static void typedef_add(char *name, struct type *type)
 155 {
 156         struct typdefinfo *ti = &typedefs[ntypedefs++];
 157         if (ntypedefs >= MAXTYPEDEFS)
 158                 err("nomem: MAXTYPEDEFS reached!\n");
 159         strcpy(ti->name, name);
 160         memcpy(&ti->type, type, sizeof(*type));
 161 }
 162
 163 static int typedef_find(char *name)
 164 {
 165         int i;
 166         for (i = ntypedefs - 1; i >= 0; --i)
 167                 if (!strcmp(name, typedefs[i].name))
 168                         return i;
 169         return -1;
 170 }
 171
 172 #define MAXARRAYS               (1 << 10)
 173
 174 static struct array {
 175         struct type type;
 176         int n;
 177 } arrays[MAXARRAYS];
 178 static int narrays;
 179
 180 static int array_add(struct type *type, int n)
 181 {
 182         struct array *a = &arrays[narrays++];
 183         if (narrays >= MAXARRAYS)
 184                 err("nomem: MAXARRAYS reached!\n");
 185         memcpy(&a->type, type, sizeof(*type));
 186         a->n = n;
 187         return a - arrays;
 188 }
 189
 190 static void array2ptr(struct type *t)
 191 {
 192         if (!(t->flags & T_ARRAY) || t->ptr)
 193                 return;
 194         memcpy(t, &arrays[t->id].type, sizeof(*t));
 195         t->ptr++;
 196 }
 197
 198 #define MAXSTRUCTS              (1 << 10)
 199 #define MAXFIELDS               (1 << 7)
 200
 201 static struct structinfo {
 202         char name[NAMELEN];
 203         struct name fields[MAXFIELDS];
 204         int nfields;
 205         int isunion;
 206         int size;
 207 } structs[MAXSTRUCTS];
 208 static int nstructs;
 209
 210 static int struct_find(char *name, int isunion)
 211 {
 212         int i;
 213         for (i = nstructs - 1; i >= 0; --i)
 214                 if (*structs[i].name && !strcmp(name, structs[i].name) &&
 215                                 structs[i].isunion == isunion)
 216                         return i;
 217         i = nstructs++;
 218         if (nstructs >= MAXSTRUCTS)
 219                 err("nomem: MAXTYPES reached!\n");
 220         memset(&structs[i], 0, sizeof(structs[i]));
 221         strcpy(structs[i].name, name);
 222         structs[i].isunion = isunion;
 223         return i;
 224 }
 225
 226 static struct name *struct_field(int id, char *name)
 227 {
 228         struct structinfo *si = &structs[id];
 229         int i;
 230         for (i = 0; i < si->nfields; i++)
 231                 if (!strcmp(name, si->fields[i].name))
 232                         return &si->fields[i];
 233         err("field not found\n");
 234 }
 235
 236 #define MAXBREAK                (1 << 7)
 237
 238 static long breaks[MAXBREAK];
 239 static int nbreaks;
 240 static long continues[MAXBREAK];
 241 static int ncontinues;
 242
 243 static void break_fill(long addr, int till)
 244 {
 245         int i;
 246         for (i = till; i < nbreaks; i++)
 247                 o_filljmp2(breaks[i], addr);
 248         nbreaks = till;
 249 }
 250
 251 static void continue_fill(long addr, int till)
 252 {
 253         int i;
 254         for (i = till; i < ncontinues; i++)
 255                 o_filljmp2(continues[i], addr);
 256         ncontinues = till;
 257 }
 258
 259 static int type_totsz(struct type *t)
 260 {
 261         if (t->ptr)
 262                 return 8;
 263         if (t->flags & T_ARRAY)
 264                 return arrays[t->id].n * type_totsz(&arrays[t->id].type);
 265         return t->flags & T_STRUCT ? structs[t->id].size : BT_SZ(t->bt);
 266 }
 267
 268 static unsigned type_szde(struct type *t)
 269 {
 270         struct type de = *t;
 271         array2ptr(&de);
 272         de.ptr--;
 273         return type_totsz(&de);
 274 }
 275
 276 static int tok_jmp(int tok)
 277 {
 278         if (tok_see() != tok)
 279                 return 1;
 280         tok_get();
 281         return 0;
 282 }
 283
 284 static void tok_expect(int tok)
 285 {
 286         if (tok_get() != tok)
 287                 err("syntax error\n");
 288 }
 289
 290 static unsigned bt_op(unsigned bt1, unsigned bt2)
 291 {
 292         unsigned s1 = BT_SZ(bt1);
 293         unsigned s2 = BT_SZ(bt2);
 294         return (bt1 | bt2) & BT_SIGNED | (s1 > s2 ? s1 : s2);
 295 }
 296
 297 static void ts_binop(void (*o_sth)(void))
 298 {
 299         struct type t1, t2;
 300         ts_pop(&t1);
 301         ts_pop(&t2);
 302         o_sth();
 303         ts_push_bt(bt_op(TYPE_BT(&t1), TYPE_BT(&t2)));
 304 }
 305
 306 static void ts_binop_add(void (*o_sth)(void))
 307 {
 308         struct type t1, t2;
 309         ts_pop(&t1);
 310         ts_pop(&t2);
 311         array2ptr(&t1);
 312         array2ptr(&t2);
 313         if (!t1.ptr && !t2.ptr) {
 314                 o_sth();
 315                 ts_push_bt(bt_op(TYPE_BT(&t1), TYPE_BT(&t2)));
 316                 return;
 317         }
 318         if (t1.ptr && !t2.ptr) {
 319                 struct type t = t2;
 320                 t2 = t1;
 321                 t1 = t;
 322                 o_tmpswap();
 323         }
 324         if (!t1.ptr && t2.ptr)
 325                 if (type_szde(&t2) > 1) {
 326                         o_num(type_szde(&t2), 4);
 327                         o_mul();
 328                 }
 329         o_sth();
 330         if (t1.ptr && t2.ptr) {
 331                 int sz = type_szde(&t1);
 332                 if (sz > 1) {
 333                         o_num(sz, 4);
 334                         o_div();
 335                 }
 336                 ts_push_bt(4 | BT_SIGNED);
 337         } else {
 338                 ts_push(&t2);
 339         }
 340 }
 341
 342 #define ALIGN(x, a)             (((x) + (a) - 1) & ~((a) - 1))
 343 #define MIN(a, b)               ((a) < (b) ? (a) : (b))
 344
 345 static int type_alignment(struct type *t)
 346 {
 347         if (t->flags & T_ARRAY && !t->ptr)
 348                 return type_alignment(&arrays[t->id].type);
 349         if (t->flags & T_STRUCT && !t->ptr)
 350                 return type_alignment(&structs[t->id].fields[0].type);
 351         return MIN(8, type_totsz(t));
 352 }
 353
 354 static void structdef(void *data, struct name *name, unsigned flags)
 355 {
 356         struct structinfo *si = data;
 357         if (si->isunion) {
 358                 name->addr = 0;
 359                 if (si->size < type_totsz(&name->type))
 360                         si->size = type_totsz(&name->type);
 361         } else {
 362                 struct type *t = &name->type;
 363                 int alignment = type_alignment(t);
 364                 if (t->flags & T_ARRAY && !t->ptr)
 365                         alignment = MIN(8, type_totsz(&arrays[t->id].type));
 366                 si->size = ALIGN(si->size, alignment);
 367                 name->addr = si->size;
 368                 si->size += type_totsz(&name->type);
 369         }
 370         memcpy(&si->fields[si->nfields++], name, sizeof(*name));
 371 }
 372
 373 static int readdefs(void (*def)(void *, struct name *, unsigned f), void *data);
 374
 375 static int struct_create(char *name, int isunion)
 376 {
 377         int id = struct_find(name, isunion);
 378         struct structinfo *si = &structs[id];
 379         tok_expect('{');
 380         while (tok_jmp('}')) {
 381                 readdefs(structdef, si);
 382                 tok_expect(';');
 383         }
 384         return id;
 385 }
 386
 387 static void readexpr(void);
 388
 389 static void enum_create(void)
 390 {
 391         long n = 0;
 392         tok_expect('{');
 393         while (tok_jmp('}')) {
 394                 char name[NAMELEN];
 395                 tok_expect(TOK_NAME);
 396                 strcpy(name, tok_id());
 397                 if (tok_see() == '=') {
 398                         tok_get();
 399                         readexpr();
 400                         ts_pop(NULL);
 401                         if (o_popnum(&n))
 402                                 err("const expr expected!\n");
 403                 }
 404                 enum_add(name, n++);
 405                 tok_jmp(',');
 406         }
 407 }
 408
 409 static int basetype(struct type *type, unsigned *flags)
 410 {
 411         int sign = 1;
 412         int size = 4;
 413         int done = 0;
 414         int i = 0;
 415         int isunion;
 416         char name[NAMELEN] = "";
 417         *flags = 0;
 418         type->flags = 0;
 419         type->ptr = 0;
 420         while (!done) {
 421                 switch (tok_see()) {
 422                 case TOK_STATIC:
 423                         *flags |= F_STATIC;
 424                         break;
 425                 case TOK_EXTERN:
 426                         *flags |= F_EXTERN;
 427                         break;
 428                 case TOK_VOID:
 429                         sign = 0;
 430                         size = 0;
 431                         done = 1;
 432                         break;
 433                 case TOK_INT:
 434                         done = 1;
 435                         break;
 436                 case TOK_CHAR:
 437                         size = 1;
 438                         done = 1;
 439                         break;
 440                 case TOK_SHORT:
 441                         size = 2;
 442                         break;
 443                 case TOK_LONG:
 444                         size = 8;
 445                         break;
 446                 case TOK_SIGNED:
 447                         break;
 448                 case TOK_UNSIGNED:
 449                         sign = 0;
 450                         break;
 451                 case TOK_UNION:
 452                 case TOK_STRUCT:
 453                         isunion = tok_get() == TOK_UNION;
 454                         if (!tok_jmp(TOK_NAME))
 455                                 strcpy(name, tok_id());
 456                         if (tok_see() == '{')
 457                                 type->id = struct_create(name, isunion);
 458                         else
 459                                 type->id = struct_find(name, isunion);
 460                         type->flags |= T_STRUCT;
 461                         type->bt = 8;
 462                         return 0;
 463                 case TOK_ENUM:
 464                         tok_get();
 465                         tok_jmp(TOK_NAME);
 466                         if (tok_see() == '{')
 467                                 enum_create();
 468                         type->bt = 4 | BT_SIGNED;
 469                         return 0;
 470                 default:
 471                         if (tok_see() == TOK_NAME) {
 472                                 int id = typedef_find(tok_id());
 473                                 if (id != -1) {
 474                                         tok_get();
 475                                         memcpy(type, &typedefs[id].type,
 476                                                 sizeof(*type));
 477                                         return 0;
 478                                 }
 479                         }
 480                         if (!i)
 481                                 return 1;
 482                         done = 1;
 483                         continue;
 484                 }
 485                 i++;
 486                 tok_get();
 487         }
 488         type->bt = size | (sign ? BT_SIGNED : 0);
 489         return 0;
 490 }
 491
 492 static int readname(struct type *main, char *name,
 493                         struct type *base, unsigned flags);
 494
 495 static int readtype(struct type *type)
 496 {
 497         return readname(type, NULL, NULL, 0);
 498 }
 499
 500 static void readptrs(struct type *type)
 501 {
 502         while (!tok_jmp('*')) {
 503                 type->ptr++;
 504                 if (!type->bt)
 505                         type->bt = 1;
 506         }
 507 }
 508
 509 /* used to differenciate labels from case and cond exprs */
 510 static int ncexpr;
 511 static int caseexpr;
 512
 513 static void readpre(void);
 514
 515 static void readprimary(void)
 516 {
 517         int i;
 518         if (!tok_jmp(TOK_NUM)) {
 519                 long n;
 520                 int bt = tok_num(&n);
 521                 ts_push_bt(bt);
 522                 o_num(n, bt);
 523                 return;
 524         }
 525         if (!tok_jmp(TOK_STR)) {
 526                 struct type t;
 527                 char buf[BUFSIZE];
 528                 int len;
 529                 t.bt = 1 | BT_SIGNED;
 530                 t.ptr = 1;
 531                 t.flags = 0;
 532                 ts_push(&t);
 533                 len = tok_str(buf);
 534                 o_symaddr(out_mkdat(NULL, buf, len, 0), TYPE_BT(&t));
 535                 o_addr();
 536                 return;
 537         }
 538         if (!tok_jmp(TOK_NAME)) {
 539                 struct name unkn = {0};
 540                 char *name = unkn.name;
 541                 int n;
 542                 strcpy(name, tok_id());
 543                 /* don't search for labels here */
 544                 if (!ncexpr && !caseexpr && tok_see() == ':')
 545                         return;
 546                 for (i = nlocals - 1; i >= 0; --i) {
 547                         struct type *t = &locals[i].type;
 548                         if (!strcmp(locals[i].name, name)) {
 549                                 o_local(locals[i].addr, TYPE_BT(t));
 550                                 ts_push(t);
 551                                 return;
 552                         }
 553                 }
 554                 if ((n = global_find(name)) != -1) {
 555                         struct name *g = &globals[n];
 556                         struct type *t = &g->type;
 557                         if (g->unused) {
 558                                 g->unused = 0;
 559                                 if (t->flags & T_FUNC && !t->ptr)
 560                                         g->addr = out_mkundef(name, 0);
 561                                 else
 562                                         g->addr = out_mkundef(name, type_totsz(t));
 563                         }
 564                         o_symaddr(g->addr, TYPE_BT(t));
 565                         ts_push(t);
 566                         return;
 567                 }
 568                 if (!enum_find(&n, name)) {
 569                         ts_push_bt(4 | BT_SIGNED);
 570                         o_num(n, 4 | BT_SIGNED);
 571                         return;
 572                 }
 573                 if (tok_see() != '(')
 574                         err("unknown symbol\n");
 575                 unkn.addr = out_mkundef(unkn.name, 0);
 576                 global_add(&unkn);
 577                 ts_push_bt(8);
 578                 o_symaddr(unkn.addr, 8);
 579                 return;
 580         }
 581         if (!tok_jmp('(')) {
 582                 struct type t;
 583                 if (!readtype(&t)) {
 584                         struct type o;
 585                         tok_expect(')');
 586                         readpre();
 587                         ts_pop(&o);
 588                         ts_push(&t);
 589                         if (!t.ptr || !o.ptr)
 590                                 o_cast(TYPE_BT(&t));
 591                 } else {
 592                         readexpr();
 593                         tok_expect(')');
 594                 }
 595                 return;
 596         }
 597 }
 598
 599 void arrayderef(struct type *t)
 600 {
 601         int sz = type_totsz(t);
 602         if (sz > 1) {
 603                 o_num(sz, 4);
 604                 o_mul();
 605         }
 606         o_add();
 607         o_deref(TYPE_BT(t));
 608 }
 609
 610 static void inc_post(void (*inc_one)(void), void (*inc_many)(void))
 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                 inc_one();
 619         } else {
 620                 o_tmpcopy();
 621                 o_num(sz, 4);
 622                 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_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(8);
 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(void (*inc_one)(void), void (*inc_many)(void))
 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                 inc_one();
 750         } else {
 751                 o_num(sz, 4);
 752                 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_lnot();
 787                 ts_push_bt(4 | BT_SIGNED);
 788                 return;
 789         }
 790         if (!tok_jmp('-')) {
 791                 readpre();
 792                 o_neg();
 793                 return;
 794         }
 795         if (!tok_jmp('~')) {
 796                 readpre();
 797                 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_binop_add(o_add);
 858                         continue;
 859                 }
 860                 if (!tok_jmp('-')) {
 861                         readmul();
 862                         ts_binop_add(o_sub);
 863                         continue;
 864                 }
 865                 break;
 866         }
 867 }
 868
 869 static void shift(void (*op)(void))
 870 {
 871         struct type t;
 872         readadd();
 873         ts_pop(NULL);
 874         ts_pop(&t);
 875         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(void (*op)(void))
 896 {
 897         readshift();
 898         ts_pop(NULL);
 899         ts_pop(NULL);
 900         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(void (*op)(void))
 929 {
 930         readcmp();
 931         ts_pop(NULL);
 932         ts_pop(NULL);
 933         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(void (*bop)(void (*op)(void)), void (*op)(void))
1094 {
1095         unsigned bt = TYPE_BT(&ts[nts - 1]);
1096         o_tmpcopy();
1097         readexpr();
1098         bop(op);
1099         ts_pop(NULL);
1100         o_assign(bt);
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(ts_binop_add, o_add);
1123                 return;
1124         }
1125         if (!tok_jmp(TOK2("-="))) {
1126                 opassign(ts_binop_add, o_sub);
1127                 return;
1128         }
1129         if (!tok_jmp(TOK2("*="))) {
1130                 opassign(ts_binop, o_mul);
1131                 return;
1132         }
1133         if (!tok_jmp(TOK2("/="))) {
1134                 opassign(ts_binop, o_div);
1135                 return;
1136         }
1137         if (!tok_jmp(TOK2("%="))) {
1138                 opassign(ts_binop, o_mod);
1139                 return;
1140         }
1141         if (!tok_jmp(TOK3("<<="))) {
1142                 opassign(ts_binop, o_shl);
1143                 return;
1144         }
1145         if (!tok_jmp(TOK3(">>="))) {
1146                 opassign(ts_binop, o_shr);
1147                 return;
1148         }
1149         if (!tok_jmp(TOK3("&="))) {
1150                 opassign(ts_binop, o_and);
1151                 return;
1152         }
1153         if (!tok_jmp(TOK3("|="))) {
1154                 opassign(ts_binop, o_or);
1155                 return;
1156         }
1157         if (!tok_jmp(TOK3("^="))) {
1158                 opassign(ts_binop, o_xor);
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_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                 arrays[t->id].n = initsize();
1303         sz = type_totsz(t);
1304         if (flags & F_EXTERN || t->flags & T_FUNC && !t->ptr)
1305                 name->unused = 1;
1306         else if (flags & F_INIT)
1307                 name->addr = out_mkdat(varname, NULL, sz, F_GLOBAL(flags));
1308         else
1309                 name->addr = out_mkvar(varname, sz, F_GLOBAL(flags));
1310         global_add(name);
1311         if (flags & F_INIT)
1312                 initexpr(t, 0, &name->addr, globalinit);
1313 }
1314
1315 static void localinit(void *obj, int off, struct type *t)
1316 {
1317         long addr = *(long *) obj;
1318         if (t->flags & T_ARRAY && tok_see() == TOK_STR) {
1319                 struct type *t_de = &arrays[t->id].type;
1320                 if (!t_de->ptr && !t_de->flags && TYPE_SZ(t_de) == 1) {
1321                         char buf[BUFSIZE];
1322                         int len;
1323                         tok_expect(TOK_STR);
1324                         len = tok_str(buf);
1325                         o_localoff(addr, off, TYPE_BT(t));
1326                         o_symaddr(out_mkdat(NULL, buf, len, 0), TYPE_BT(t));
1327                         o_memcpy(len);
1328                         o_tmpdrop(1);
1329                         return;
1330                 }
1331         }
1332         o_localoff(addr, off, TYPE_BT(t));
1333         ts_push(t);
1334         readexpr();
1335         doassign();
1336         ts_pop(NULL);
1337         o_tmpdrop(1);
1338 }
1339
1340 static void localdef(void *data, struct name *name, unsigned flags)
1341 {
1342         struct type *t = &name->type;
1343         if (flags & (F_STATIC | F_EXTERN)) {
1344                 globaldef(data, name, flags);
1345                 return;
1346         }
1347         if (t->flags & T_ARRAY && !t->ptr && !arrays[t->id].n)
1348                 arrays[t->id].n = initsize();
1349         name->addr = o_mklocal(type_totsz(&name->type));
1350         local_add(name);
1351         if (flags & F_INIT) {
1352                 if (t->flags & (T_ARRAY | T_STRUCT) && !t->ptr) {
1353                         o_local(name->addr, TYPE_BT(t));
1354                         o_memset(0, type_totsz(t));
1355                         o_tmpdrop(1);
1356                 }
1357                 initexpr(t, 0, &name->addr, localinit);
1358         }
1359 }
1360
1361 static void funcdef(char *name, struct type *type, struct name *args,
1362                         int nargs, unsigned flags)
1363 {
1364         struct name global;
1365         int i;
1366         strcpy(global.name, name);
1367         memcpy(&global.type, type, sizeof(*type));
1368         global.addr = o_func_beg(name, F_GLOBAL(flags));
1369         global.unused = 0;
1370         global_add(&global);
1371         ret_bt = TYPE_BT(&funcs[type->id].ret);
1372         for (i = 0; i < nargs; i++) {
1373                 args[i].addr = o_arg(i, type_totsz(&args[i].type));
1374                 local_add(&args[i]);
1375         }
1376 }
1377
1378 static int readargs(struct name *args)
1379 {
1380         int nargs = 0;
1381         tok_expect('(');
1382         while (tok_see() != ')') {
1383                 if (!tok_jmp(TOK3("...")))
1384                         break;
1385                 readname(&args[nargs].type, args[nargs].name, NULL, 0);
1386                 array2ptr(&args[nargs].type);
1387                 nargs++;
1388                 if (tok_jmp(','))
1389                         break;
1390         }
1391         tok_expect(')');
1392         if (nargs == 1 && !TYPE_BT(&args[0].type))
1393                 return 0;
1394         return nargs;
1395 }
1396
1397 static int readname(struct type *main, char *name,
1398                         struct type *base, unsigned flags)
1399 {
1400         struct type tpool[3];
1401         int npool = 0;
1402         struct type *type = &tpool[npool++];
1403         struct type *func = NULL;
1404         struct type *ret = NULL;
1405         int arsz[10];
1406         int nar = 0;
1407         int i;
1408         memset(tpool, 0, sizeof(tpool));
1409         if (name)
1410                 *name = '\0';
1411         if (!base) {
1412                 if (basetype(type, &flags))
1413                         return 1;
1414         } else {
1415                 memcpy(type, base, sizeof(*base));
1416         }
1417         readptrs(type);
1418         if (!tok_jmp('(')) {
1419                 ret = type;
1420                 type = &tpool[npool++];
1421                 func = type;
1422                 readptrs(type);
1423         }
1424         if (!tok_jmp(TOK_NAME) && name)
1425                 strcpy(name, tok_id());
1426         while (!tok_jmp('[')) {
1427                 long n = 0;
1428                 if (tok_jmp(']')) {
1429                         readexpr();
1430                         ts_pop(NULL);
1431                         if (o_popnum(&n))
1432                                 err("const expr expected\n");
1433                         tok_expect(']');
1434                 }
1435                 arsz[nar++] = n;
1436         }
1437         for (i = nar - 1; i >= 0; i--) {
1438                 type->id = array_add(type, arsz[i]);
1439                 if (type->flags & T_FUNC)
1440                         func = &arrays[type->id].type;
1441                 type->flags = T_ARRAY;
1442                 type->bt = 8;
1443                 type->ptr = 0;
1444         }
1445         if (func)
1446                 tok_expect(')');
1447         if (tok_see() == '(') {
1448                 struct name args[MAXARGS];
1449                 int nargs = readargs(args);
1450                 int fdef = !func;
1451                 if (!func) {
1452                         ret = type;
1453                         type = &tpool[npool++];
1454                         func = type;
1455                 }
1456                 func->flags = T_FUNC;
1457                 func->bt = 8;
1458                 func->id = func_create(ret, args, nargs);
1459                 if (fdef && tok_see() == '{') {
1460                         funcdef(name, func, args, nargs, flags);
1461                         return 1;
1462                 }
1463         }
1464         memcpy(main, type, sizeof(*type));
1465         return 0;
1466 }
1467
1468 static int readdefs(void (*def)(void *data, struct name *name, unsigned flags),
1469                         void *data)
1470 {
1471         struct type base;
1472         unsigned flags;
1473         if (basetype(&base, &flags))
1474                 return 1;
1475         while (tok_see() != ';' && tok_see() != '{') {
1476                 struct name name;
1477                 name.unused = 0;
1478                 if (readname(&name.type, name.name, &base, flags))
1479                         break;
1480                 if (!tok_jmp('='))
1481                         flags |= F_INIT;
1482                 def(data, &name, flags);
1483                 tok_jmp(',');
1484         }
1485         return 0;
1486 }
1487
1488 static void typedefdef(void *data, struct name *name, unsigned flags)
1489 {
1490         typedef_add(name->name, &name->type);
1491 }
1492
1493 static void readstmt(void);
1494
1495 #define MAXCASES                (1 << 7)
1496
1497 static void readswitch(void)
1498 {
1499         int break_beg = nbreaks;
1500         long val_addr = o_mklocal(8);
1501         long matched[MAXCASES];
1502         int nmatched = 0;
1503         struct type t;
1504         long next;
1505         int ref = 1;
1506         int i;
1507         tok_expect('(');
1508         readexpr();
1509         ts_pop(&t);
1510         o_local(val_addr, TYPE_BT(&t));
1511         o_tmpswap();
1512         o_assign(TYPE_BT(&t));
1513         o_tmpdrop(1);
1514         tok_expect(')');
1515         tok_expect('{');
1516         while (tok_jmp('}')) {
1517                 int n = 0;
1518                 while (tok_see() == TOK_CASE || tok_see() == TOK_DEFAULT) {
1519                         if (n++ > 0)
1520                                 matched[nmatched++] = o_jmp(0);
1521                         if (!ref++)
1522                                 o_filljmp(next);
1523                         if (!tok_jmp(TOK_CASE)) {
1524                                 caseexpr = 1;
1525                                 readexpr();
1526                                 caseexpr = 0;
1527                                 o_local(val_addr, TYPE_BT(&t));
1528                                 o_eq();
1529                                 next = o_jz(0);
1530                                 ref = 0;
1531                                 tok_expect(':');
1532                                 o_tmpdrop(1);
1533                                 ts_pop(NULL);
1534                                 continue;
1535                         }
1536                         if (!tok_jmp(TOK_DEFAULT)) {
1537                                 tok_expect(':');
1538                                 continue;
1539                         }
1540                 }
1541                 for (i = 0; i < nmatched; i++)
1542                         o_filljmp(matched[i]);
1543                 nmatched = 0;
1544                 readstmt();
1545         }
1546         o_rmlocal(val_addr, 8);
1547         if (!ref++)
1548                 o_filljmp(next);
1549         break_fill(o_mklabel(), break_beg);
1550 }
1551
1552 #define MAXGOTO                 (1 << 10)
1553
1554 static struct gotoinfo {
1555         char name[NAMELEN];
1556         long addr;
1557 } gotos[MAXGOTO];
1558 static int ngotos;
1559
1560 static struct labelinfo {
1561         char name[NAMELEN];
1562         long addr;
1563 } labels[MAXGOTO];
1564 static int nlabels;
1565
1566 static void goto_add(char *name)
1567 {
1568         strcpy(gotos[ngotos].name, name);
1569         gotos[ngotos++].addr = o_jmp(0);
1570 }
1571
1572 static void label_add(char *name)
1573 {
1574         strcpy(labels[nlabels].name, name);
1575         labels[nlabels++].addr = o_mklabel();
1576 }
1577
1578 static void goto_fill(void)
1579 {
1580         int i, j;
1581         for (i = 0; i < ngotos; i++)
1582                 for (j = 0; j < nlabels; j++)
1583                         if (!strcmp(gotos[i].name, labels[j].name)) {
1584                                 o_filljmp2(gotos[i].addr, labels[j].addr);
1585                                 break;
1586                         }
1587 }
1588
1589 static void readstmt(void)
1590 {
1591         o_tmpdrop(-1);
1592         nts = 0;
1593         if (!tok_jmp('{')) {
1594                 int _nlocals = nlocals;
1595                 int _nglobals = nglobals;
1596                 int _nenums = nenums;
1597                 int _ntypedefs = ntypedefs;
1598                 int _nstructs = nstructs;
1599                 int _nfuncs = nfuncs;
1600                 int _narrays = narrays;
1601                 while (tok_jmp('}'))
1602                         readstmt();
1603                 nlocals = _nlocals;
1604                 nenums = _nenums;
1605                 ntypedefs = _ntypedefs;
1606                 nstructs = _nstructs;
1607                 nfuncs = _nfuncs;
1608                 narrays = _narrays;
1609                 nglobals = _nglobals;
1610                 return;
1611         }
1612         if (!readdefs(localdef, NULL)) {
1613                 tok_expect(';');
1614                 return;
1615         }
1616         if (!tok_jmp(TOK_TYPEDEF)) {
1617                 readdefs(typedefdef, NULL);
1618                 tok_expect(';');
1619                 return;
1620         }
1621         if (!tok_jmp(TOK_IF)) {
1622                 long l1, l2;
1623                 tok_expect('(');
1624                 readexpr();
1625                 tok_expect(')');
1626                 l1 = o_jz(0);
1627                 readstmt();
1628                 if (!tok_jmp(TOK_ELSE)) {
1629                         l2 = o_jmp(0);
1630                         o_filljmp(l1);
1631                         readstmt();
1632                         o_filljmp(l2);
1633                 } else {
1634                         o_filljmp(l1);
1635                 }
1636                 return;
1637         }
1638         if (!tok_jmp(TOK_WHILE)) {
1639                 long l1, l2;
1640                 int break_beg = nbreaks;
1641                 int continue_beg = ncontinues;
1642                 l1 = o_mklabel();
1643                 tok_expect('(');
1644                 readexpr();
1645                 tok_expect(')');
1646                 l2 = o_jz(0);
1647                 readstmt();
1648                 o_jmp(l1);
1649                 o_filljmp(l2);
1650                 break_fill(o_mklabel(), break_beg);
1651                 continue_fill(l1, continue_beg);
1652                 return;
1653         }
1654         if (!tok_jmp(TOK_DO)) {
1655                 long l1, l2;
1656                 int break_beg = nbreaks;
1657                 int continue_beg = ncontinues;
1658                 l1 = o_mklabel();
1659                 readstmt();
1660                 tok_expect(TOK_WHILE);
1661                 tok_expect('(');
1662                 l2 = o_mklabel();
1663                 readexpr();
1664                 o_jnz(l1);
1665                 tok_expect(')');
1666                 break_fill(o_mklabel(), break_beg);
1667                 continue_fill(l2, continue_beg);
1668                 return;
1669         }
1670         if (!tok_jmp(TOK_FOR)) {
1671                 long l_check, l_jump, j_fail, j_pass;
1672                 int break_beg = nbreaks;
1673                 int continue_beg = ncontinues;
1674                 int has_cond = 0;
1675                 tok_expect('(');
1676                 if (tok_see() != ';')
1677                         readestmt();
1678                 tok_expect(';');
1679                 l_check = o_mklabel();
1680                 if (tok_see() != ';') {
1681                         readestmt();
1682                         j_fail = o_jz(0);
1683                         has_cond = 1;
1684                 }
1685                 tok_expect(';');
1686                 j_pass = o_jmp(0);
1687                 l_jump = o_mklabel();
1688                 if (tok_see() != ')')
1689                         readestmt();
1690                 tok_expect(')');
1691                 o_jmp(l_check);
1692                 o_filljmp(j_pass);
1693                 readstmt();
1694                 o_jmp(l_jump);
1695                 if (has_cond)
1696                         o_filljmp(j_fail);
1697                 break_fill(o_mklabel(), break_beg);
1698                 continue_fill(l_jump, continue_beg);
1699                 return;
1700         }
1701         if (!tok_jmp(TOK_SWITCH)) {
1702                 readswitch();
1703                 return;
1704         }
1705         if (!tok_jmp(TOK_RETURN)) {
1706                 int ret = tok_see() != ';';
1707                 if (ret)
1708                         readexpr();
1709                 tok_expect(';');
1710                 o_ret(ret_bt);
1711                 return;
1712         }
1713         if (!tok_jmp(TOK_BREAK)) {
1714                 tok_expect(';');
1715                 breaks[nbreaks++] = o_jmp(0);
1716                 return;
1717         }
1718         if (!tok_jmp(TOK_CONTINUE)) {
1719                 tok_expect(';');
1720                 continues[ncontinues++] = o_jmp(0);
1721                 return;
1722         }
1723         if (!tok_jmp(TOK_GOTO)) {
1724                 tok_expect(TOK_NAME);
1725                 goto_add(tok_id());
1726                 tok_expect(';');
1727                 return;
1728         }
1729         readestmt();
1730         /* labels */
1731         if (!tok_jmp(':')) {
1732                 label_add(tok_id());
1733                 return;
1734         }
1735         tok_expect(';');
1736 }
1737
1738 static void readdecl(void)
1739 {
1740         if (!tok_jmp(TOK_TYPEDEF)) {
1741                 readdefs(typedefdef, NULL);
1742                 tok_expect(';');
1743                 return;
1744         }
1745         readdefs(globaldef, NULL);
1746         if (tok_see() == '{') {
1747                 readstmt();
1748                 goto_fill();
1749                 o_func_end();
1750                 nlocals = 0;
1751                 ngotos = 0;
1752                 nlabels = 0;
1753                 return;
1754         }
1755         tok_expect(';');
1756 }
1757
1758 static void parse(void)
1759 {
1760         while (tok_see() != TOK_EOF)
1761                 readdecl();
1762 }
1763
1764 int main(int argc, char *argv[])
1765 {
1766         char obj[128];
1767         int ofd;
1768         int i = 1;
1769         while (i < argc && argv[i][0] == '-') {
1770                 if (argv[i][1] == 'I')
1771                         cpp_addpath(argv[i][2] ? argv[i] + 2 : argv[++i]);
1772                 if (argv[i][1] == 'D') {
1773                         char *name = argv[i] + 2;
1774                         char *def = "";
1775                         char *eq = strchr(name, '=');
1776                         if (eq) {
1777                                 *eq = '\0';
1778                                 def = eq + 1;
1779                         }
1780                         cpp_define(name, def);
1781                 }
1782                 i++;
1783         }
1784         if (i == argc)
1785                 die("neatcc: no file given\n");
1786         if (cpp_init(argv[i]))
1787                 die("neatcc: cannot open input file\n");
1788         parse();
1789         strcpy(obj, argv[i]);
1790         obj[strlen(obj) - 1] = 'o';
1791         ofd = open(obj, O_WRONLY | O_TRUNC | O_CREAT, 0600);
1792         out_write(ofd);
1793         close(ofd);
1794         return 0;
1795 }