ncc.c

   1 /*
   2  * neatcc - a small and simple C compiler
   3  *
   4  * Copyright (C) 2010-2011 Ali Gholami Rudi
   5  *
   6  * This file is released under GNU GPL version 2.
   7  */
   8 #include <fcntl.h>
   9 #include <unistd.h>
  10 #include <stdlib.h>
  11 #include <string.h>
  12 #include <stdio.h>
  13 #include <sys/stat.h>
  14 #include <sys/types.h>
  15 #include "gen.h"
  16 #include "tok.h"
  17 #include "out.h"
  18
  19 #define MAXLOCALS       (1 << 10)
  20 #define MAXGLOBALS      (1 << 10)
  21 #define MAXARGS         (1 << 5)
  22
  23 #define TYPE_BT(t)              ((t)->ptr ? LONGSZ : (t)->bt)
  24 #define TYPE_SZ(t)              ((t)->ptr ? LONGSZ : (t)->bt & BT_SZMASK)
  25
  26 #define T_ARRAY         0x01
  27 #define T_STRUCT        0x02
  28 #define T_FUNC          0x04
  29
  30 #define F_INIT          0x01
  31 #define F_STATIC        0x02
  32 #define F_EXTERN        0x04
  33
  34 struct type {
  35         unsigned bt;
  36         unsigned flags;
  37         int ptr;
  38         int id;         /* for structs, functions and arrays */
  39         int addr;       /* the address is passed to gen.c; deref for value */
  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].addr = 0;
  51         ts[nts++].bt = bt;
  52 }
  53
  54 static void ts_push(struct type *t)
  55 {
  56         struct type *d = &ts[nts++];
  57         memcpy(d, t, sizeof(*t));
  58 }
  59
  60 static void ts_push_addr(struct type *t)
  61 {
  62         ts_push(t);
  63         ts[nts - 1].addr = 1;
  64 }
  65
  66 static void ts_pop(struct type *type)
  67 {
  68         nts--;
  69         if (type)
  70                 *type = ts[nts];
  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         char elfname[NAMELEN];  /* local elf name for static variables in function */
  84         struct type type;
  85         long addr;      /* local stack offset, global data addr, struct offset */
  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                 memcpy(t, &arrays[t->id].type, sizeof(*t));
 194                 t->ptr++;
 195         }
 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 void ts_de(int deref)
 277 {
 278         struct type *t = &ts[nts - 1];
 279         if (deref && t->addr && (!(t->flags & T_ARRAY) || (t->ptr)))
 280                 o_deref(TYPE_BT(t));
 281         t->addr = 0;
 282 }
 283
 284 static void ts_pop_de(struct type *t)
 285 {
 286         struct type de;
 287         if (!t)
 288                 t = &de;
 289         ts_pop(t);
 290         array2ptr(t);
 291         if (t->addr && !(t->flags & T_FUNC))
 292                 o_deref(TYPE_BT(t));
 293         t->addr = 0;
 294 }
 295
 296 static void ts_pop_de2(struct type *t1, struct type *t2)
 297 {
 298         ts_pop_de(t1);
 299         o_tmpswap();
 300         ts_pop_de(t2);
 301         o_tmpswap();
 302 }
 303
 304 static int tok_jmp(int tok)
 305 {
 306         if (tok_see() != tok)
 307                 return 1;
 308         tok_get();
 309         return 0;
 310 }
 311
 312 static void tok_expect(int tok)
 313 {
 314         if (tok_get() != tok)
 315                 err("syntax error\n");
 316 }
 317
 318 static unsigned bt_op(unsigned bt1, unsigned bt2)
 319 {
 320         unsigned s1 = BT_SZ(bt1);
 321         unsigned s2 = BT_SZ(bt2);
 322         return (bt1 | bt2) & BT_SIGNED | (s1 > s2 ? s1 : s2);
 323 }
 324
 325 static void ts_binop(int op)
 326 {
 327         struct type t1, t2;
 328         ts_pop_de2(&t1, &t2);
 329         o_bop(op);
 330         ts_push_bt(bt_op(TYPE_BT(&t1), TYPE_BT(&t2)));
 331 }
 332
 333 static void ts_addop(int op)
 334 {
 335         struct type t1, t2;
 336         ts_pop_de2(&t1, &t2);
 337         if (!t1.ptr && !t2.ptr) {
 338                 o_bop(op);
 339                 ts_push_bt(bt_op(TYPE_BT(&t1), TYPE_BT(&t2)));
 340                 return;
 341         }
 342         if (t1.ptr && !t2.ptr)
 343                 o_tmpswap();
 344         if (!t1.ptr && t2.ptr)
 345                 if (type_szde(&t2) > 1) {
 346                         o_num(type_szde(&t2));
 347                         o_bop(O_MUL);
 348                 }
 349         if (t1.ptr && !t2.ptr)
 350                 o_tmpswap();
 351         o_bop(op);
 352         if (t1.ptr && t2.ptr) {
 353                 int sz = type_szde(&t1);
 354                 if (sz > 1) {
 355                         o_num(sz);
 356                         o_bop(O_DIV);
 357                 }
 358                 ts_push_bt(4 | BT_SIGNED);
 359         } else {
 360                 ts_push(t1.ptr ? &t1 : &t2);
 361         }
 362 }
 363
 364 #define ALIGN(x, a)             (((x) + (a) - 1) & ~((a) - 1))
 365 #define MIN(a, b)               ((a) < (b) ? (a) : (b))
 366
 367 static int type_alignment(struct type *t)
 368 {
 369         if (t->flags & T_ARRAY && !t->ptr)
 370                 return type_alignment(&arrays[t->id].type);
 371         if (t->flags & T_STRUCT && !t->ptr)
 372                 return type_alignment(&structs[t->id].fields[0].type);
 373         return MIN(LONGSZ, type_totsz(t));
 374 }
 375
 376 static void structdef(void *data, struct name *name, unsigned flags)
 377 {
 378         struct structinfo *si = data;
 379         if (si->isunion) {
 380                 name->addr = 0;
 381                 if (si->size < type_totsz(&name->type))
 382                         si->size = type_totsz(&name->type);
 383         } else {
 384                 struct type *t = &name->type;
 385                 int alignment = type_alignment(t);
 386                 if (t->flags & T_ARRAY && !t->ptr)
 387                         alignment = MIN(LONGSZ, type_totsz(&arrays[t->id].type));
 388                 si->size = ALIGN(si->size, alignment);
 389                 name->addr = si->size;
 390                 si->size += type_totsz(&name->type);
 391         }
 392         memcpy(&si->fields[si->nfields++], name, sizeof(*name));
 393 }
 394
 395 static int readdefs(void (*def)(void *, struct name *, unsigned f), void *data);
 396
 397 static int struct_create(char *name, int isunion)
 398 {
 399         int id = struct_find(name, isunion);
 400         struct structinfo *si = &structs[id];
 401         tok_expect('{');
 402         while (tok_jmp('}')) {
 403                 readdefs(structdef, si);
 404                 tok_expect(';');
 405         }
 406         return id;
 407 }
 408
 409 static void readexpr(void);
 410
 411 static void enum_create(void)
 412 {
 413         long n = 0;
 414         tok_expect('{');
 415         while (tok_jmp('}')) {
 416                 char name[NAMELEN];
 417                 tok_expect(TOK_NAME);
 418                 strcpy(name, tok_id());
 419                 if (tok_see() == '=') {
 420                         tok_get();
 421                         readexpr();
 422                         ts_pop(NULL);
 423                         if (o_popnum(&n))
 424                                 err("const expr expected!\n");
 425                 }
 426                 enum_add(name, n++);
 427                 tok_jmp(',');
 428         }
 429 }
 430
 431 static int basetype(struct type *type, unsigned *flags)
 432 {
 433         int sign = 1;
 434         int size = 4;
 435         int done = 0;
 436         int i = 0;
 437         int isunion;
 438         char name[NAMELEN] = "";
 439         *flags = 0;
 440         type->flags = 0;
 441         type->ptr = 0;
 442         type->addr = 0;
 443         while (!done) {
 444                 switch (tok_see()) {
 445                 case TOK_STATIC:
 446                         *flags |= F_STATIC;
 447                         break;
 448                 case TOK_EXTERN:
 449                         *flags |= F_EXTERN;
 450                         break;
 451                 case TOK_VOID:
 452                         sign = 0;
 453                         size = 0;
 454                         done = 1;
 455                         break;
 456                 case TOK_INT:
 457                         done = 1;
 458                         break;
 459                 case TOK_CHAR:
 460                         size = 1;
 461                         done = 1;
 462                         break;
 463                 case TOK_SHORT:
 464                         size = 2;
 465                         break;
 466                 case TOK_LONG:
 467                         size = LONGSZ;
 468                         break;
 469                 case TOK_SIGNED:
 470                         break;
 471                 case TOK_UNSIGNED:
 472                         sign = 0;
 473                         break;
 474                 case TOK_UNION:
 475                 case TOK_STRUCT:
 476                         isunion = tok_get() == TOK_UNION;
 477                         if (!tok_jmp(TOK_NAME))
 478                                 strcpy(name, tok_id());
 479                         if (tok_see() == '{')
 480                                 type->id = struct_create(name, isunion);
 481                         else
 482                                 type->id = struct_find(name, isunion);
 483                         type->flags |= T_STRUCT;
 484                         type->bt = LONGSZ;
 485                         return 0;
 486                 case TOK_ENUM:
 487                         tok_get();
 488                         tok_jmp(TOK_NAME);
 489                         if (tok_see() == '{')
 490                                 enum_create();
 491                         type->bt = 4 | BT_SIGNED;
 492                         return 0;
 493                 default:
 494                         if (tok_see() == TOK_NAME) {
 495                                 int id = typedef_find(tok_id());
 496                                 if (id != -1) {
 497                                         tok_get();
 498                                         memcpy(type, &typedefs[id].type,
 499                                                 sizeof(*type));
 500                                         return 0;
 501                                 }
 502                         }
 503                         if (!i)
 504                                 return 1;
 505                         done = 1;
 506                         continue;
 507                 }
 508                 i++;
 509                 tok_get();
 510         }
 511         type->bt = size | (sign ? BT_SIGNED : 0);
 512         return 0;
 513 }
 514
 515 static int readname(struct type *main, char *name,
 516                         struct type *base, unsigned flags);
 517
 518 static int readtype(struct type *type)
 519 {
 520         return readname(type, NULL, NULL, 0);
 521 }
 522
 523 static void readptrs(struct type *type)
 524 {
 525         while (!tok_jmp('*')) {
 526                 type->ptr++;
 527                 if (!type->bt)
 528                         type->bt = 1;
 529         }
 530 }
 531
 532 /* used to differenciate labels from case and cond exprs */
 533 static int ncexpr;
 534 static int caseexpr;
 535
 536 static void readpre(void);
 537
 538 static char *tmp_str(char *buf, int len)
 539 {
 540         static char name[NAMELEN];
 541         static int id;
 542         void *dat;
 543         sprintf(name, "__neatcc.s%d", id++);
 544         dat = dat_dat(name, len, 0);
 545         memcpy(dat, buf, len);
 546         return name;
 547 }
 548
 549 static void readprimary(void)
 550 {
 551         int i;
 552         if (!tok_jmp(TOK_NUM)) {
 553                 long n;
 554                 int bt = tok_num(&n);
 555                 ts_push_bt(bt);
 556                 o_num(n);
 557                 return;
 558         }
 559         if (!tok_jmp(TOK_STR)) {
 560                 struct type t;
 561                 char buf[BUFSIZE];
 562                 int len;
 563                 t.bt = 1 | BT_SIGNED;
 564                 t.ptr = 1;
 565                 t.addr = 0;
 566                 t.flags = 0;
 567                 ts_push(&t);
 568                 len = tok_str(buf);
 569                 o_sym(tmp_str(buf, len));
 570                 return;
 571         }
 572         if (!tok_jmp(TOK_NAME)) {
 573                 struct name unkn = {""};
 574                 char *name = unkn.name;
 575                 int n;
 576                 strcpy(name, tok_id());
 577                 /* don't search for labels here */
 578                 if (!ncexpr && !caseexpr && tok_see() == ':')
 579                         return;
 580                 for (i = nlocals - 1; i >= 0; --i) {
 581                         struct type *t = &locals[i].type;
 582                         if (!strcmp(locals[i].name, name)) {
 583                                 o_local(locals[i].addr);
 584                                 ts_push_addr(t);
 585                                 return;
 586                         }
 587                 }
 588                 if ((n = global_find(name)) != -1) {
 589                         struct name *g = &globals[n];
 590                         struct type *t = &g->type;
 591                         char *elfname = *g->elfname ? g->elfname : g->name;
 592                         o_sym(elfname);
 593                         ts_push_addr(t);
 594                         return;
 595                 }
 596                 if (!enum_find(&n, name)) {
 597                         ts_push_bt(4 | BT_SIGNED);
 598                         o_num(n);
 599                         return;
 600                 }
 601                 if (tok_see() != '(')
 602                         err("unknown symbol\n");
 603                 global_add(&unkn);
 604                 ts_push_bt(LONGSZ);
 605                 o_sym(unkn.name);
 606                 return;
 607         }
 608         if (!tok_jmp('(')) {
 609                 struct type t;
 610                 if (!readtype(&t)) {
 611                         struct type o;
 612                         tok_expect(')');
 613                         readpre();
 614                         ts_pop_de(&o);
 615                         ts_push(&t);
 616                         if (!t.ptr || !o.ptr)
 617                                 o_cast(TYPE_BT(&t));
 618                 } else {
 619                         readexpr();
 620                         tok_expect(')');
 621                 }
 622                 return;
 623         }
 624 }
 625
 626 static void arrayderef(void)
 627 {
 628         struct type t;
 629         int sz;
 630         ts_pop_de(NULL);
 631         ts_pop(&t);
 632         if (!(t.flags & T_ARRAY) && t.addr) {
 633                 o_tmpswap();
 634                 o_deref(TYPE_BT(&t));
 635                 o_tmpswap();
 636         }
 637         array2ptr(&t);
 638         t.ptr--;
 639         sz = type_totsz(&t);
 640         t.addr = 1;
 641         if (sz > 1) {
 642                 o_num(sz);
 643                 o_bop(O_MUL);
 644         }
 645         o_bop(O_ADD);
 646         ts_push(&t);
 647 }
 648
 649 static void inc_post(int op)
 650 {
 651         struct type t = ts[nts - 1];
 652         /* pushing the value before inc */
 653         o_tmpcopy();
 654         ts_de(1);
 655         o_load();
 656         o_tmpswap();
 657
 658         /* increment by 1 or pointer size */
 659         o_tmpcopy();
 660         ts_push(&t);
 661         ts_pop_de(&t);
 662         o_num(t.ptr > 0 ? type_szde(&t) : 1);
 663         o_bop(op);
 664
 665         /* assign back */
 666         o_assign(TYPE_BT(&t));
 667         o_tmpdrop(1);
 668 }
 669
 670 static void readfield(void)
 671 {
 672         struct name *field;
 673         struct type t;
 674         tok_expect(TOK_NAME);
 675         ts_pop(&t);
 676         array2ptr(&t);
 677         field = struct_field(t.id, tok_id());
 678         if (field->addr) {
 679                 o_num(field->addr);
 680                 o_bop(O_ADD);
 681         }
 682         ts_push_addr(&field->type);
 683 }
 684
 685 #define MAXFUNCS                (1 << 10)
 686
 687 static struct funcinfo {
 688         struct type args[MAXFIELDS];
 689         struct type ret;
 690         int nargs;
 691 } funcs[MAXFUNCS];
 692 static int nfuncs;
 693
 694 static int func_create(struct type *ret, struct name *args, int nargs)
 695 {
 696         struct funcinfo *fi = &funcs[nfuncs++];
 697         int i;
 698         if (nfuncs >= MAXFUNCS)
 699                 err("nomem: MAXFUNCS reached!\n");
 700         memcpy(&fi->ret, ret, sizeof(*ret));
 701         for (i = 0; i < nargs; i++)
 702                 memcpy(&fi->args[i], &args[i].type, sizeof(*ret));
 703         fi->nargs = nargs;
 704         return fi - funcs;
 705 }
 706
 707 static void readcall(void)
 708 {
 709         struct type t;
 710         struct funcinfo *fi;
 711         int argc = 0;
 712         ts_pop(&t);
 713         if (t.flags & T_FUNC && t.ptr > 0)
 714                 o_deref(LONGSZ);
 715         fi = t.flags & T_FUNC ? &funcs[t.id] : NULL;
 716         if (tok_see() != ')') {
 717                 do {
 718                         readexpr();
 719                         ts_pop_de(NULL);
 720                         argc++;
 721                 } while (!tok_jmp(','));
 722         }
 723         tok_expect(')');
 724         o_call(argc, fi ? TYPE_BT(&fi->ret) : 4 | BT_SIGNED);
 725         if (fi) {
 726                 if (TYPE_BT(&fi->ret))
 727                         o_cast(TYPE_BT(&fi->ret));
 728                 ts_push(&fi->ret);
 729         } else {
 730                 ts_push_bt(4 | BT_SIGNED);
 731         }
 732 }
 733
 734 static void readpost(void)
 735 {
 736         readprimary();
 737         while (1) {
 738                 if (!tok_jmp('[')) {
 739                         readexpr();
 740                         tok_expect(']');
 741                         arrayderef();
 742                         continue;
 743                 }
 744                 if (!tok_jmp('(')) {
 745                         readcall();
 746                         continue;
 747                 }
 748                 if (!tok_jmp(TOK2("++"))) {
 749                         inc_post(O_ADD);
 750                         continue;
 751                 }
 752                 if (!tok_jmp(TOK2("--"))) {
 753                         inc_post(O_SUB);
 754                         continue;
 755                 }
 756                 if (!tok_jmp('.')) {
 757                         readfield();
 758                         continue;
 759                 }
 760                 if (!tok_jmp(TOK2("->"))) {
 761                         ts_de(1);
 762                         readfield();
 763                         continue;
 764                 }
 765                 break;
 766         }
 767 }
 768
 769 static void inc_pre(int op)
 770 {
 771         struct type t;
 772         readpre();
 773         /* copy the destination */
 774         o_tmpcopy();
 775         ts_push(&ts[nts - 1]);
 776         /* increment by 1 or pointer size */
 777         ts_pop_de(&t);
 778         o_num(t.ptr > 0 ? type_szde(&t) : 1);
 779         o_bop(op);
 780         /* assign the result */
 781         o_assign(TYPE_BT(&t));
 782         ts_de(0);
 783 }
 784
 785 static void readpre(void)
 786 {
 787         if (!tok_jmp('&')) {
 788                 struct type type;
 789                 readpre();
 790                 ts_pop(&type);
 791                 if (!type.addr)
 792                         die("cannot use the address\n");
 793                 type.ptr++;
 794                 type.addr = 0;
 795                 ts_push(&type);
 796                 return;
 797         }
 798         if (!tok_jmp('*')) {
 799                 struct type t;
 800                 readpre();
 801                 ts_pop(&t);
 802                 array2ptr(&t);
 803                 if (!t.ptr)
 804                         err("dereferencing non-pointer\n");
 805                 if (t.addr)
 806                         o_deref(TYPE_BT(&t));
 807                 t.ptr--;
 808                 t.addr = 1;
 809                 ts_push(&t);
 810                 return;
 811         }
 812         if (!tok_jmp('!')) {
 813                 readpre();
 814                 ts_pop_de(NULL);
 815                 o_uop(O_LNOT);
 816                 ts_push_bt(4 | BT_SIGNED);
 817                 return;
 818         }
 819         if (!tok_jmp('-')) {
 820                 readpre();
 821                 ts_de(1);
 822                 o_uop(O_NEG);
 823                 return;
 824         }
 825         if (!tok_jmp('~')) {
 826                 readpre();
 827                 ts_de(1);
 828                 o_uop(O_NOT);
 829                 return;
 830         }
 831         if (!tok_jmp(TOK2("++"))) {
 832                 inc_pre(O_ADD);
 833                 return;
 834         }
 835         if (!tok_jmp(TOK2("--"))) {
 836                 inc_pre(O_SUB);
 837                 return;
 838         }
 839         if (!tok_jmp(TOK_SIZEOF)) {
 840                 struct type t;
 841                 int op = !tok_jmp('(');
 842                 if (readtype(&t)) {
 843                         int nogen = !o_nogen();
 844                         readexpr();
 845                         if (nogen)
 846                                 o_dogen();
 847                         ts_pop(&t);
 848                         o_tmpdrop(1);
 849                 }
 850                 ts_push_bt(4);
 851                 o_num(type_totsz(&t));
 852                 if (op)
 853                         tok_expect(')');
 854                 return;
 855         }
 856         readpost();
 857 }
 858
 859 static void readmul(void)
 860 {
 861         readpre();
 862         while (1) {
 863                 if (!tok_jmp('*')) {
 864                         readpre();
 865                         ts_binop(O_MUL);
 866                         continue;
 867                 }
 868                 if (!tok_jmp('/')) {
 869                         readpre();
 870                         ts_binop(O_DIV);
 871                         continue;
 872                 }
 873                 if (!tok_jmp('%')) {
 874                         readpre();
 875                         ts_binop(O_MOD);
 876                         continue;
 877                 }
 878                 break;
 879         }
 880 }
 881
 882 static void readadd(void)
 883 {
 884         readmul();
 885         while (1) {
 886                 if (!tok_jmp('+')) {
 887                         readmul();
 888                         ts_addop(O_ADD);
 889                         continue;
 890                 }
 891                 if (!tok_jmp('-')) {
 892                         readmul();
 893                         ts_addop(O_SUB);
 894                         continue;
 895                 }
 896                 break;
 897         }
 898 }
 899
 900 static void shift(int op)
 901 {
 902         struct type t;
 903         readadd();
 904         ts_pop_de2(NULL, &t);
 905         o_bop(op | (BT_SIGNED & TYPE_BT(&t) ? O_SIGNED : 0));
 906         ts_push_bt(TYPE_BT(&t));
 907 }
 908
 909 static void readshift(void)
 910 {
 911         readadd();
 912         while (1) {
 913                 if (!tok_jmp(TOK2("<<"))) {
 914                         shift(O_SHL);
 915                         continue;
 916                 }
 917                 if (!tok_jmp(TOK2(">>"))) {
 918                         shift(O_SHR);
 919                         continue;
 920                 }
 921                 break;
 922         }
 923 }
 924
 925 static void cmp(int op)
 926 {
 927         struct type t1, t2;
 928         int bt;
 929         readshift();
 930         ts_pop_de2(&t1, &t2);
 931         bt = bt_op(TYPE_BT(&t1), TYPE_BT(&t2));
 932         o_bop(op | (bt & BT_SIGNED ? O_SIGNED : 0));
 933         ts_push_bt(4 | BT_SIGNED);
 934 }
 935
 936 static void readcmp(void)
 937 {
 938         readshift();
 939         while (1) {
 940                 if (!tok_jmp('<')) {
 941                         cmp(O_LT);
 942                         continue;
 943                 }
 944                 if (!tok_jmp('>')) {
 945                         cmp(O_GT);
 946                         continue;
 947                 }
 948                 if (!tok_jmp(TOK2("<="))) {
 949                         cmp(O_LE);
 950                         continue;
 951                 }
 952                 if (!tok_jmp(TOK2(">="))) {
 953                         cmp(O_GE);
 954                         continue;
 955                 }
 956                 break;
 957         }
 958 }
 959
 960 static void eq(int op)
 961 {
 962         readcmp();
 963         ts_pop_de2(NULL, NULL);
 964         o_bop(op);
 965         ts_push_bt(4 | BT_SIGNED);
 966 }
 967
 968 static void readeq(void)
 969 {
 970         readcmp();
 971         while (1) {
 972                 if (!tok_jmp(TOK2("=="))) {
 973                         eq(O_EQ);
 974                         continue;
 975                 }
 976                 if (!tok_jmp(TOK2("!="))) {
 977                         eq(O_NEQ);
 978                         continue;
 979                 }
 980                 break;
 981         }
 982 }
 983
 984 static void readbitand(void)
 985 {
 986         readeq();
 987         while (!tok_jmp('&')) {
 988                 readeq();
 989                 ts_binop(O_AND);
 990         }
 991 }
 992
 993 static void readxor(void)
 994 {
 995         readbitand();
 996         while (!tok_jmp('^')) {
 997                 readbitand();
 998                 ts_binop(O_XOR);
 999         }
1000 }
1001
1002 static void readbitor(void)
1003 {
1004         readxor();
1005         while (!tok_jmp('|')) {
1006                 readxor();
1007                 ts_binop(O_OR);
1008         }
1009 }
1010
1011 #define MAXCOND                 (1 << 7)
1012
1013 static void readand(void)
1014 {
1015         long conds[MAXCOND];
1016         int nconds = 0;
1017         long passed;
1018         int i;
1019         readbitor();
1020         if (tok_see() != TOK2("&&"))
1021                 return;
1022         o_fork();
1023         ts_pop_de(NULL);
1024         conds[nconds++] = o_jz(0);
1025         while (!tok_jmp(TOK2("&&"))) {
1026                 readbitor();
1027                 ts_pop_de(NULL);
1028                 conds[nconds++] = o_jz(0);
1029         }
1030         o_num(1);
1031         o_forkpush();
1032         passed = o_jmp(0);
1033         for (i = 0; i < nconds; i++)
1034                 o_filljmp(conds[i]);
1035         o_num(0);
1036         o_forkpush();
1037         o_forkjoin();
1038         o_filljmp(passed);
1039         ts_push_bt(4 | BT_SIGNED);
1040 }
1041
1042 static void reador(void)
1043 {
1044         long conds[MAXCOND];
1045         int nconds = 0;
1046         long failed;
1047         int i;
1048         readand();
1049         if (tok_see() != TOK2("||"))
1050                 return;
1051         o_fork();
1052         ts_pop_de(NULL);
1053         conds[nconds++] = o_jnz(0);
1054         while (!tok_jmp(TOK2("||"))) {
1055                 readand();
1056                 ts_pop_de(NULL);
1057                 conds[nconds++] = o_jnz(0);
1058         }
1059         o_num(0);
1060         o_forkpush();
1061         failed = o_jmp(0);
1062         for (i = 0; i < nconds; i++)
1063                 o_filljmp(conds[i]);
1064         o_num(1);
1065         o_forkpush();
1066         o_forkjoin();
1067         o_filljmp(failed);
1068         ts_push_bt(4 | BT_SIGNED);
1069 }
1070
1071 static int readcexpr_const(void)
1072 {
1073         long c;
1074         int nogen;
1075         if (o_popnum(&c))
1076                 return -1;
1077         if (!c)
1078                 nogen = !o_nogen();
1079         reador();
1080         ts_pop(NULL);
1081         tok_expect(':');
1082         if (c) {
1083                 nogen = !o_nogen();
1084         } else {
1085                 if (nogen)
1086                         o_dogen();
1087                 o_tmpdrop(1);
1088         }
1089         reador();
1090         if (c) {
1091                 if (nogen)
1092                         o_dogen();
1093                 o_tmpdrop(1);
1094         }
1095         return 0;
1096 }
1097
1098 static void readcexpr(void)
1099 {
1100         long l1, l2;
1101         reador();
1102         if (tok_jmp('?'))
1103                 return;
1104         ncexpr++;
1105         ts_pop_de(NULL);
1106         o_fork();
1107         if (readcexpr_const()) {
1108                 l1 = o_jz(0);
1109                 reador();
1110                 o_forkpush();
1111                 l2 = o_jmp(0);
1112                 ts_pop(NULL);
1113
1114                 tok_expect(':');
1115                 o_filljmp(l1);
1116                 reador();
1117                 o_forkpush();
1118                 o_forkjoin();
1119                 o_filljmp(l2);
1120         }
1121         ncexpr--;
1122 }
1123
1124 static void opassign(int op, int ptrop)
1125 {
1126         struct type t = ts[nts - 1];
1127         o_tmpcopy();
1128         ts_push(&t);
1129         readexpr();
1130         ts_addop(op);
1131         o_assign(TYPE_BT(&ts[nts - 1]));
1132         ts_pop(NULL);
1133         ts_de(0);
1134 }
1135
1136 static void doassign(void)
1137 {
1138         struct type t = ts[nts - 1];
1139         if (!t.ptr && t.flags & T_STRUCT) {
1140                 ts_pop(NULL);
1141                 o_num(type_totsz(&t));
1142                 o_memcpy();
1143         } else {
1144                 ts_pop_de(NULL);
1145                 o_assign(TYPE_BT(&ts[nts - 1]));
1146                 ts_de(0);
1147         }
1148 }
1149
1150 static void readexpr(void)
1151 {
1152         readcexpr();
1153         if (!tok_jmp('=')) {
1154                 readexpr();
1155                 doassign();
1156                 return;
1157         }
1158         if (!tok_jmp(TOK2("+="))) {
1159                 opassign(O_ADD, 1);
1160                 return;
1161         }
1162         if (!tok_jmp(TOK2("-="))) {
1163                 opassign(O_SUB, 1);
1164                 return;
1165         }
1166         if (!tok_jmp(TOK2("*="))) {
1167                 opassign(O_MUL, 0);
1168                 return;
1169         }
1170         if (!tok_jmp(TOK2("/="))) {
1171                 opassign(O_DIV, 0);
1172                 return;
1173         }
1174         if (!tok_jmp(TOK2("%="))) {
1175                 opassign(O_MOD, 0);
1176                 return;
1177         }
1178         if (!tok_jmp(TOK3("<<="))) {
1179                 opassign(O_SHL, 0);
1180                 return;
1181         }
1182         if (!tok_jmp(TOK3(">>="))) {
1183                 opassign(O_SHR, 0);
1184                 return;
1185         }
1186         if (!tok_jmp(TOK3("&="))) {
1187                 opassign(O_AND, 0);
1188                 return;
1189         }
1190         if (!tok_jmp(TOK3("|="))) {
1191                 opassign(O_OR, 0);
1192                 return;
1193         }
1194         if (!tok_jmp(TOK3("^="))) {
1195                 opassign(O_XOR, 0);
1196                 return;
1197         }
1198 }
1199
1200 static void readestmt(void)
1201 {
1202         do {
1203                 o_tmpdrop(-1);
1204                 nts = 0;
1205                 readexpr();
1206         } while (!tok_jmp(','));
1207 }
1208
1209 static void o_localoff(long addr, int off)
1210 {
1211         o_local(addr);
1212         if (off) {
1213                 o_num(off);
1214                 o_bop(O_ADD);
1215         }
1216 }
1217
1218 static struct type *innertype(struct type *t)
1219 {
1220         if (t->flags & T_ARRAY && !t->ptr)
1221                 return innertype(&arrays[t->id].type);
1222         return t;
1223 }
1224
1225 static void initexpr(struct type *t, int off, void *obj,
1226                 void (*set)(void *obj, int off, struct type *t))
1227 {
1228         if (tok_jmp('{')) {
1229                 set(obj, off, t);
1230                 return;
1231         }
1232         if (!t->ptr && t->flags & T_STRUCT) {
1233                 struct structinfo *si = &structs[t->id];
1234                 int i;
1235                 for (i = 0; i < si->nfields; i++) {
1236                         struct name *field = &si->fields[i];
1237                         if (!tok_jmp('.')) {
1238                                 tok_expect(TOK_NAME);
1239                                 field = struct_field(t->id, tok_id());
1240                                 tok_expect('=');
1241                         }
1242                         initexpr(&field->type, off + field->addr, obj, set);
1243                         if (tok_jmp(',') || tok_see() == '}')
1244                                 break;
1245                 }
1246         } else if (t->flags & T_ARRAY) {
1247                 struct type *t_de = &arrays[t->id].type;
1248                 int i;
1249                 for (i = 0; ; i++) {
1250                         long idx = i;
1251                         struct type *it = t_de;
1252                         if (!tok_jmp('[')) {
1253                                 readexpr();
1254                                 o_popnum(&idx);
1255                                 ts_pop(NULL);
1256                                 tok_expect(']');
1257                                 tok_expect('=');
1258                         }
1259                         if (tok_see() != '{')
1260                                 it = innertype(t_de);
1261                         initexpr(it, off + type_totsz(it) * idx, obj, set);
1262                         if (tok_jmp(',') || tok_see() == '}')
1263                                 break;
1264                 }
1265         }
1266         tok_expect('}');
1267 }
1268
1269 static void jumpbrace(void)
1270 {
1271         int depth = 0;
1272         while (tok_see() != '}' || depth--)
1273                 if (tok_get() == '{')
1274                         depth++;
1275         tok_expect('}');
1276 }
1277
1278 static int initsize(void)
1279 {
1280         long addr = tok_addr();
1281         int n = 0;
1282         if (!tok_jmp(TOK_STR)) {
1283                 n = tok_str(NULL);
1284                 tok_jump(addr);
1285                 return n;
1286         }
1287         o_nogen();
1288         tok_expect('{');
1289         while (tok_jmp('}')) {
1290                 long idx = n;
1291                 if (!tok_jmp('[')) {
1292                         readexpr();
1293                         o_popnum(&idx);
1294                         ts_pop(NULL);
1295                         tok_expect(']');
1296                         tok_expect('=');
1297                 }
1298                 if (n < idx + 1)
1299                         n = idx + 1;
1300                 while (tok_see() != '}' && tok_see() != ',')
1301                         if (tok_get() == '{')
1302                                 jumpbrace();
1303                 tok_jmp(',');
1304         }
1305         o_dogen();
1306         tok_jump(addr);
1307         return n;
1308 }
1309
1310 #define F_GLOBAL(flags)         (!((flags) & F_STATIC))
1311
1312 static void globalinit(void *obj, int off, struct type *t)
1313 {
1314         struct name *name = obj;
1315         char *elfname = *name->elfname ? name->elfname : name->name;
1316         if (t->flags & T_ARRAY && tok_see() == TOK_STR) {
1317                 struct type *t_de = &arrays[t->id].type;
1318                 if (!t_de->ptr && !t_de->flags && TYPE_SZ(t_de) == 1) {
1319                         char buf[BUFSIZE];
1320                         int len;
1321                         tok_expect(TOK_STR);
1322                         len = tok_str(buf);
1323                         memcpy((void *) name->addr + off, buf, len);
1324                         return;
1325                 }
1326         }
1327         readexpr();
1328         o_datset(elfname, off, TYPE_BT(t));
1329         ts_pop(NULL);
1330 }
1331
1332 static void globaldef(void *data, struct name *name, unsigned flags)
1333 {
1334         struct type *t = &name->type;
1335         char *elfname = *name->elfname ? name->elfname : name->name;
1336         int sz;
1337         if (t->flags & T_ARRAY && !t->ptr && !arrays[t->id].n)
1338                 if (~flags & F_EXTERN)
1339                         arrays[t->id].n = initsize();
1340         sz = type_totsz(t);
1341         if (!(flags & F_EXTERN) && (!(t->flags & T_FUNC) || t->ptr)) {
1342                 if (flags & F_INIT)
1343                         name->addr = (long) dat_dat(elfname, sz, F_GLOBAL(flags));
1344                 else
1345                         dat_bss(elfname, sz, F_GLOBAL(flags));
1346         }
1347         global_add(name);
1348         if (flags & F_INIT)
1349                 initexpr(t, 0, name, globalinit);
1350 }
1351
1352 static void localinit(void *obj, int off, struct type *t)
1353 {
1354         long addr = *(long *) obj;
1355         if (t->flags & T_ARRAY && tok_see() == TOK_STR) {
1356                 struct type *t_de = &arrays[t->id].type;
1357                 if (!t_de->ptr && !t_de->flags && TYPE_SZ(t_de) == 1) {
1358                         char buf[BUFSIZE];
1359                         int len;
1360                         tok_expect(TOK_STR);
1361                         len = tok_str(buf);
1362                         o_localoff(addr, off);
1363                         o_sym(tmp_str(buf, len));
1364                         o_num(len);
1365                         o_memcpy();
1366                         o_tmpdrop(1);
1367                         return;
1368                 }
1369         }
1370         o_localoff(addr, off);
1371         ts_push(t);
1372         readexpr();
1373         doassign();
1374         ts_pop(NULL);
1375         o_tmpdrop(1);
1376 }
1377
1378 /* current function name */
1379 static char func_name[NAMELEN];
1380
1381 static void localdef(void *data, struct name *name, unsigned flags)
1382 {
1383         struct type *t = &name->type;
1384         if (flags & (F_STATIC | F_EXTERN)) {
1385                 sprintf(name->elfname, "__neatcc.%s.%s", func_name, name->name);
1386                 globaldef(data, name, flags);
1387                 return;
1388         }
1389         if (t->flags & T_ARRAY && !t->ptr && !arrays[t->id].n)
1390                 arrays[t->id].n = initsize();
1391         name->addr = o_mklocal(type_totsz(&name->type));
1392         local_add(name);
1393         if (flags & F_INIT) {
1394                 if (t->flags & (T_ARRAY | T_STRUCT) && !t->ptr) {
1395                         o_local(name->addr);
1396                         o_num(0);
1397                         o_num(type_totsz(t));
1398                         o_memset();
1399                         o_tmpdrop(1);
1400                 }
1401                 initexpr(t, 0, &name->addr, localinit);
1402         }
1403 }
1404
1405 static void funcdef(char *name, struct type *type, struct name *args,
1406                         int nargs, unsigned flags)
1407 {
1408         struct name global = {""};
1409         int i;
1410         strcpy(global.name, name);
1411         strcpy(func_name, name);
1412         memcpy(&global.type, type, sizeof(*type));
1413         o_func_beg(name, F_GLOBAL(flags));
1414         global_add(&global);
1415         for (i = 0; i < nargs; i++) {
1416                 args[i].addr = o_arg(i);
1417                 local_add(&args[i]);
1418         }
1419 }
1420
1421 static int readargs(struct name *args)
1422 {
1423         int nargs = 0;
1424         tok_expect('(');
1425         while (tok_see() != ')') {
1426                 if (!tok_jmp(TOK3("...")))
1427                         break;
1428                 readname(&args[nargs].type, args[nargs].name, NULL, 0);
1429                 array2ptr(&args[nargs].type);
1430                 nargs++;
1431                 if (tok_jmp(','))
1432                         break;
1433         }
1434         tok_expect(')');
1435         if (nargs == 1 && !TYPE_BT(&args[0].type))
1436                 return 0;
1437         return nargs;
1438 }
1439
1440 static int readname(struct type *main, char *name,
1441                         struct type *base, unsigned flags)
1442 {
1443         struct type tpool[3];
1444         int npool = 0;
1445         struct type *type = &tpool[npool++];
1446         struct type *func = NULL;
1447         struct type *ret = NULL;
1448         int arsz[10];
1449         int nar = 0;
1450         int i;
1451         memset(tpool, 0, sizeof(tpool));
1452         if (name)
1453                 *name = '\0';
1454         if (!base) {
1455                 if (basetype(type, &flags))
1456                         return 1;
1457         } else {
1458                 memcpy(type, base, sizeof(*base));
1459         }
1460         readptrs(type);
1461         if (!tok_jmp('(')) {
1462                 ret = type;
1463                 type = &tpool[npool++];
1464                 func = type;
1465                 readptrs(type);
1466         }
1467         if (!tok_jmp(TOK_NAME) && name)
1468                 strcpy(name, tok_id());
1469         while (!tok_jmp('[')) {
1470                 long n = 0;
1471                 if (tok_jmp(']')) {
1472                         readexpr();
1473                         ts_pop(NULL);
1474                         if (o_popnum(&n))
1475                                 err("const expr expected\n");
1476                         tok_expect(']');
1477                 }
1478                 arsz[nar++] = n;
1479         }
1480         for (i = nar - 1; i >= 0; i--) {
1481                 type->id = array_add(type, arsz[i]);
1482                 if (func && i == nar - 1)
1483                         func = &arrays[type->id].type;
1484                 type->flags = T_ARRAY;
1485                 type->bt = LONGSZ;
1486                 type->ptr = 0;
1487         }
1488         if (func)
1489                 tok_expect(')');
1490         if (tok_see() == '(') {
1491                 struct name args[MAXARGS] = {{""}};
1492                 int nargs = readargs(args);
1493                 int fdef = !func;
1494                 if (!func) {
1495                         ret = type;
1496                         type = &tpool[npool++];
1497                         func = type;
1498                 }
1499                 func->flags = T_FUNC;
1500                 func->bt = LONGSZ;
1501                 func->id = func_create(ret, args, nargs);
1502                 if (fdef && tok_see() == '{') {
1503                         funcdef(name, func, args, nargs, flags);
1504                         return 1;
1505                 }
1506         }
1507         memcpy(main, type, sizeof(*type));
1508         return 0;
1509 }
1510
1511 static int readdefs(void (*def)(void *data, struct name *name, unsigned flags),
1512                         void *data)
1513 {
1514         struct type base;
1515         unsigned base_flags;
1516         if (basetype(&base, &base_flags))
1517                 return 1;
1518         while (tok_see() != ';' && tok_see() != '{') {
1519                 struct name name = {{""}};
1520                 unsigned flags = base_flags;
1521                 if (readname(&name.type, name.name, &base, flags))
1522                         break;
1523                 if (!tok_jmp('='))
1524                         flags |= F_INIT;
1525                 def(data, &name, flags);
1526                 tok_jmp(',');
1527         }
1528         return 0;
1529 }
1530
1531 static void typedefdef(void *data, struct name *name, unsigned flags)
1532 {
1533         typedef_add(name->name, &name->type);
1534 }
1535
1536 static void readstmt(void);
1537
1538 #define MAXCASES                (1 << 7)
1539
1540 static void readswitch(void)
1541 {
1542         int break_beg = nbreaks;
1543         long val_addr = o_mklocal(LONGSZ);
1544         long matched[MAXCASES];
1545         int nmatched = 0;
1546         struct type t;
1547         long next;
1548         int ref = 1;
1549         int i;
1550         tok_expect('(');
1551         readexpr();
1552         ts_pop_de(&t);
1553         o_local(val_addr);
1554         o_tmpswap();
1555         o_assign(TYPE_BT(&t));
1556         ts_de(0);
1557         o_tmpdrop(1);
1558         tok_expect(')');
1559         tok_expect('{');
1560         while (tok_jmp('}')) {
1561                 int n = 0;
1562                 while (tok_see() == TOK_CASE || tok_see() == TOK_DEFAULT) {
1563                         if (n++ > 0)
1564                                 matched[nmatched++] = o_jmp(0);
1565                         if (!ref++)
1566                                 o_filljmp(next);
1567                         if (!tok_jmp(TOK_CASE)) {
1568                                 caseexpr = 1;
1569                                 readexpr();
1570                                 ts_pop_de(NULL);
1571                                 caseexpr = 0;
1572                                 o_local(val_addr);
1573                                 o_deref(TYPE_BT(&t));
1574                                 o_bop(O_EQ);
1575                                 next = o_jz(0);
1576                                 ref = 0;
1577                                 tok_expect(':');
1578                                 o_tmpdrop(1);
1579                                 continue;
1580                         }
1581                         if (!tok_jmp(TOK_DEFAULT)) {
1582                                 tok_expect(':');
1583                                 continue;
1584                         }
1585                 }
1586                 for (i = 0; i < nmatched; i++)
1587                         o_filljmp(matched[i]);
1588                 nmatched = 0;
1589                 readstmt();
1590         }
1591         o_rmlocal(val_addr, LONGSZ);
1592         if (!ref++)
1593                 o_filljmp(next);
1594         break_fill(o_mklabel(), break_beg);
1595 }
1596
1597 #define MAXGOTO                 (1 << 10)
1598
1599 static struct gotoinfo {
1600         char name[NAMELEN];
1601         long addr;
1602 } gotos[MAXGOTO];
1603 static int ngotos;
1604
1605 static struct labelinfo {
1606         char name[NAMELEN];
1607         long addr;
1608 } labels[MAXGOTO];
1609 static int nlabels;
1610
1611 static void goto_add(char *name)
1612 {
1613         strcpy(gotos[ngotos].name, name);
1614         gotos[ngotos++].addr = o_jmp(0);
1615 }
1616
1617 static void label_add(char *name)
1618 {
1619         strcpy(labels[nlabels].name, name);
1620         labels[nlabels++].addr = o_mklabel();
1621 }
1622
1623 static void goto_fill(void)
1624 {
1625         int i, j;
1626         for (i = 0; i < ngotos; i++)
1627                 for (j = 0; j < nlabels; j++)
1628                         if (!strcmp(gotos[i].name, labels[j].name)) {
1629                                 o_filljmp2(gotos[i].addr, labels[j].addr);
1630                                 break;
1631                         }
1632 }
1633
1634 static void readstmt(void)
1635 {
1636         o_tmpdrop(-1);
1637         nts = 0;
1638         if (!tok_jmp('{')) {
1639                 int _nlocals = nlocals;
1640                 int _nglobals = nglobals;
1641                 int _nenums = nenums;
1642                 int _ntypedefs = ntypedefs;
1643                 int _nstructs = nstructs;
1644                 int _nfuncs = nfuncs;
1645                 int _narrays = narrays;
1646                 while (tok_jmp('}'))
1647                         readstmt();
1648                 nlocals = _nlocals;
1649                 nenums = _nenums;
1650                 ntypedefs = _ntypedefs;
1651                 nstructs = _nstructs;
1652                 nfuncs = _nfuncs;
1653                 narrays = _narrays;
1654                 nglobals = _nglobals;
1655                 return;
1656         }
1657         if (!readdefs(localdef, NULL)) {
1658                 tok_expect(';');
1659                 return;
1660         }
1661         if (!tok_jmp(TOK_TYPEDEF)) {
1662                 readdefs(typedefdef, NULL);
1663                 tok_expect(';');
1664                 return;
1665         }
1666         if (!tok_jmp(TOK_IF)) {
1667                 long l1, l2;
1668                 tok_expect('(');
1669                 readexpr();
1670                 tok_expect(')');
1671                 ts_pop_de(NULL);
1672                 l1 = o_jz(0);
1673                 readstmt();
1674                 if (!tok_jmp(TOK_ELSE)) {
1675                         l2 = o_jmp(0);
1676                         o_filljmp(l1);
1677                         readstmt();
1678                         o_filljmp(l2);
1679                 } else {
1680                         o_filljmp(l1);
1681                 }
1682                 return;
1683         }
1684         if (!tok_jmp(TOK_WHILE)) {
1685                 long l1, l2;
1686                 int break_beg = nbreaks;
1687                 int continue_beg = ncontinues;
1688                 l1 = o_mklabel();
1689                 tok_expect('(');
1690                 readexpr();
1691                 tok_expect(')');
1692                 ts_pop_de(NULL);
1693                 l2 = o_jz(0);
1694                 readstmt();
1695                 o_jmp(l1);
1696                 o_filljmp(l2);
1697                 break_fill(o_mklabel(), break_beg);
1698                 continue_fill(l1, continue_beg);
1699                 return;
1700         }
1701         if (!tok_jmp(TOK_DO)) {
1702                 long l1, l2;
1703                 int break_beg = nbreaks;
1704                 int continue_beg = ncontinues;
1705                 l1 = o_mklabel();
1706                 readstmt();
1707                 tok_expect(TOK_WHILE);
1708                 tok_expect('(');
1709                 l2 = o_mklabel();
1710                 readexpr();
1711                 ts_pop_de(NULL);
1712                 o_jnz(l1);
1713                 tok_expect(')');
1714                 break_fill(o_mklabel(), break_beg);
1715                 continue_fill(l2, continue_beg);
1716                 return;
1717         }
1718         if (!tok_jmp(TOK_FOR)) {
1719                 long l_check, l_jump, j_fail, j_pass;
1720                 int break_beg = nbreaks;
1721                 int continue_beg = ncontinues;
1722                 int has_cond = 0;
1723                 tok_expect('(');
1724                 if (tok_see() != ';')
1725                         readestmt();
1726                 tok_expect(';');
1727                 l_check = o_mklabel();
1728                 if (tok_see() != ';') {
1729                         readestmt();
1730                         ts_pop_de(NULL);
1731                         j_fail = o_jz(0);
1732                         has_cond = 1;
1733                 }
1734                 tok_expect(';');
1735                 j_pass = o_jmp(0);
1736                 l_jump = o_mklabel();
1737                 if (tok_see() != ')')
1738                         readestmt();
1739                 tok_expect(')');
1740                 o_jmp(l_check);
1741                 o_filljmp(j_pass);
1742                 readstmt();
1743                 o_jmp(l_jump);
1744                 if (has_cond)
1745                         o_filljmp(j_fail);
1746                 break_fill(o_mklabel(), break_beg);
1747                 continue_fill(l_jump, continue_beg);
1748                 return;
1749         }
1750         if (!tok_jmp(TOK_SWITCH)) {
1751                 readswitch();
1752                 return;
1753         }
1754         if (!tok_jmp(TOK_RETURN)) {
1755                 int ret = tok_see() != ';';
1756                 if (ret) {
1757                         readexpr();
1758                         ts_pop_de(NULL);
1759                 }
1760                 tok_expect(';');
1761                 o_ret(ret);
1762                 return;
1763         }
1764         if (!tok_jmp(TOK_BREAK)) {
1765                 tok_expect(';');
1766                 breaks[nbreaks++] = o_jmp(0);
1767                 return;
1768         }
1769         if (!tok_jmp(TOK_CONTINUE)) {
1770                 tok_expect(';');
1771                 continues[ncontinues++] = o_jmp(0);
1772                 return;
1773         }
1774         if (!tok_jmp(TOK_GOTO)) {
1775                 tok_expect(TOK_NAME);
1776                 goto_add(tok_id());
1777                 tok_expect(';');
1778                 return;
1779         }
1780         readestmt();
1781         /* labels */
1782         if (!tok_jmp(':')) {
1783                 label_add(tok_id());
1784                 return;
1785         }
1786         tok_expect(';');
1787 }
1788
1789 static void readdecl(void)
1790 {
1791         if (!tok_jmp(TOK_TYPEDEF)) {
1792                 readdefs(typedefdef, NULL);
1793                 tok_expect(';');
1794                 return;
1795         }
1796         readdefs(globaldef, NULL);
1797         if (tok_see() == '{') {
1798                 readstmt();
1799                 goto_fill();
1800                 o_func_end();
1801                 func_name[0] = '\0';
1802                 nlocals = 0;
1803                 ngotos = 0;
1804                 nlabels = 0;
1805                 return;
1806         }
1807         tok_expect(';');
1808 }
1809
1810 static void parse(void)
1811 {
1812         while (tok_see() != TOK_EOF)
1813                 readdecl();
1814 }
1815
1816 int main(int argc, char *argv[])
1817 {
1818         char obj[128];
1819         int ofd;
1820         int i = 1;
1821         while (i < argc && argv[i][0] == '-') {
1822                 if (argv[i][1] == 'I')
1823                         cpp_addpath(argv[i][2] ? argv[i] + 2 : argv[++i]);
1824                 if (argv[i][1] == 'D') {
1825                         char *name = argv[i] + 2;
1826                         char *def = "";
1827                         char *eq = strchr(name, '=');
1828                         if (eq) {
1829                                 *eq = '\0';
1830                                 def = eq + 1;
1831                         }
1832                         cpp_define(name, def);
1833                 }
1834                 i++;
1835         }
1836         if (i == argc)
1837                 die("neatcc: no file given\n");
1838         if (cpp_init(argv[i]))
1839                 die("neatcc: cannot open input file\n");
1840         parse();
1841         strcpy(obj, argv[i]);
1842         obj[strlen(obj) - 1] = 'o';
1843         ofd = open(obj, O_WRONLY | O_TRUNC | O_CREAT, 0600);
1844         o_write(ofd);
1845         close(ofd);
1846         return 0;
1847 }