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         int bt;
 329         ts_pop_de2(&t1, &t2);
 330         if (op == O_DIV || op == O_MOD)
 331                 bt = TYPE_BT(&t2);
 332         else
 333                 bt = bt_op(TYPE_BT(&t1), TYPE_BT(&t2));
 334         o_bop(op | (bt & BT_SIGNED ? O_SIGNED : 0));
 335         ts_push_bt(bt);
 336 }
 337
 338 static void ts_addop(int op)
 339 {
 340         struct type t1, t2;
 341         ts_pop_de2(&t1, &t2);
 342         if (!t1.ptr && !t2.ptr) {
 343                 o_bop(op);
 344                 ts_push_bt(bt_op(TYPE_BT(&t1), TYPE_BT(&t2)));
 345                 return;
 346         }
 347         if (t1.ptr && !t2.ptr)
 348                 o_tmpswap();
 349         if (!t1.ptr && t2.ptr)
 350                 if (type_szde(&t2) > 1) {
 351                         o_num(type_szde(&t2));
 352                         o_bop(O_MUL);
 353                 }
 354         if (t1.ptr && !t2.ptr)
 355                 o_tmpswap();
 356         o_bop(op);
 357         if (t1.ptr && t2.ptr) {
 358                 int sz = type_szde(&t1);
 359                 if (sz > 1) {
 360                         o_num(sz);
 361                         o_bop(O_DIV);
 362                 }
 363                 ts_push_bt(4 | BT_SIGNED);
 364         } else {
 365                 ts_push(t1.ptr ? &t1 : &t2);
 366         }
 367 }
 368
 369 #define ALIGN(x, a)             (((x) + (a) - 1) & ~((a) - 1))
 370 #define MIN(a, b)               ((a) < (b) ? (a) : (b))
 371
 372 static int type_alignment(struct type *t)
 373 {
 374         if (t->flags & T_ARRAY && !t->ptr)
 375                 return type_alignment(&arrays[t->id].type);
 376         if (t->flags & T_STRUCT && !t->ptr)
 377                 return type_alignment(&structs[t->id].fields[0].type);
 378         return MIN(LONGSZ, type_totsz(t));
 379 }
 380
 381 static void structdef(void *data, struct name *name, unsigned flags)
 382 {
 383         struct structinfo *si = data;
 384         if (si->isunion) {
 385                 name->addr = 0;
 386                 if (si->size < type_totsz(&name->type))
 387                         si->size = type_totsz(&name->type);
 388         } else {
 389                 struct type *t = &name->type;
 390                 int alignment = type_alignment(t);
 391                 if (t->flags & T_ARRAY && !t->ptr)
 392                         alignment = MIN(LONGSZ, type_totsz(&arrays[t->id].type));
 393                 si->size = ALIGN(si->size, alignment);
 394                 name->addr = si->size;
 395                 si->size += type_totsz(&name->type);
 396         }
 397         memcpy(&si->fields[si->nfields++], name, sizeof(*name));
 398 }
 399
 400 static int readdefs(void (*def)(void *, struct name *, unsigned f), void *data);
 401
 402 static int struct_create(char *name, int isunion)
 403 {
 404         int id = struct_find(name, isunion);
 405         struct structinfo *si = &structs[id];
 406         tok_expect('{');
 407         while (tok_jmp('}')) {
 408                 readdefs(structdef, si);
 409                 tok_expect(';');
 410         }
 411         return id;
 412 }
 413
 414 static void readexpr(void);
 415
 416 static void enum_create(void)
 417 {
 418         long n = 0;
 419         tok_expect('{');
 420         while (tok_jmp('}')) {
 421                 char name[NAMELEN];
 422                 tok_expect(TOK_NAME);
 423                 strcpy(name, tok_id());
 424                 if (tok_see() == '=') {
 425                         tok_get();
 426                         readexpr();
 427                         ts_pop(NULL);
 428                         if (o_popnum(&n))
 429                                 err("const expr expected!\n");
 430                 }
 431                 enum_add(name, n++);
 432                 tok_jmp(',');
 433         }
 434 }
 435
 436 static int basetype(struct type *type, unsigned *flags)
 437 {
 438         int sign = 1;
 439         int size = 4;
 440         int done = 0;
 441         int i = 0;
 442         int isunion;
 443         char name[NAMELEN] = "";
 444         *flags = 0;
 445         type->flags = 0;
 446         type->ptr = 0;
 447         type->addr = 0;
 448         while (!done) {
 449                 switch (tok_see()) {
 450                 case TOK_STATIC:
 451                         *flags |= F_STATIC;
 452                         break;
 453                 case TOK_EXTERN:
 454                         *flags |= F_EXTERN;
 455                         break;
 456                 case TOK_VOID:
 457                         sign = 0;
 458                         size = 0;
 459                         done = 1;
 460                         break;
 461                 case TOK_INT:
 462                         done = 1;
 463                         break;
 464                 case TOK_CHAR:
 465                         size = 1;
 466                         done = 1;
 467                         break;
 468                 case TOK_SHORT:
 469                         size = 2;
 470                         break;
 471                 case TOK_LONG:
 472                         size = LONGSZ;
 473                         break;
 474                 case TOK_SIGNED:
 475                         break;
 476                 case TOK_UNSIGNED:
 477                         sign = 0;
 478                         break;
 479                 case TOK_UNION:
 480                 case TOK_STRUCT:
 481                         isunion = tok_get() == TOK_UNION;
 482                         if (!tok_jmp(TOK_NAME))
 483                                 strcpy(name, tok_id());
 484                         if (tok_see() == '{')
 485                                 type->id = struct_create(name, isunion);
 486                         else
 487                                 type->id = struct_find(name, isunion);
 488                         type->flags |= T_STRUCT;
 489                         type->bt = LONGSZ;
 490                         return 0;
 491                 case TOK_ENUM:
 492                         tok_get();
 493                         tok_jmp(TOK_NAME);
 494                         if (tok_see() == '{')
 495                                 enum_create();
 496                         type->bt = 4 | BT_SIGNED;
 497                         return 0;
 498                 default:
 499                         if (tok_see() == TOK_NAME) {
 500                                 int id = typedef_find(tok_id());
 501                                 if (id != -1) {
 502                                         tok_get();
 503                                         memcpy(type, &typedefs[id].type,
 504                                                 sizeof(*type));
 505                                         return 0;
 506                                 }
 507                         }
 508                         if (!i)
 509                                 return 1;
 510                         done = 1;
 511                         continue;
 512                 }
 513                 i++;
 514                 tok_get();
 515         }
 516         type->bt = size | (sign ? BT_SIGNED : 0);
 517         return 0;
 518 }
 519
 520 static int readname(struct type *main, char *name,
 521                         struct type *base, unsigned flags);
 522
 523 static int readtype(struct type *type)
 524 {
 525         return readname(type, NULL, NULL, 0);
 526 }
 527
 528 static void readptrs(struct type *type)
 529 {
 530         while (!tok_jmp('*')) {
 531                 type->ptr++;
 532                 if (!type->bt)
 533                         type->bt = 1;
 534         }
 535 }
 536
 537 /* used to differenciate labels from case and cond exprs */
 538 static int ncexpr;
 539 static int caseexpr;
 540
 541 static void readpre(void);
 542
 543 static char *tmp_str(char *buf, int len)
 544 {
 545         static char name[NAMELEN];
 546         static int id;
 547         void *dat;
 548         sprintf(name, "__neatcc.s%d", id++);
 549         dat = dat_dat(name, len, 0);
 550         memcpy(dat, buf, len);
 551         return name;
 552 }
 553
 554 static void readprimary(void)
 555 {
 556         int i;
 557         if (!tok_jmp(TOK_NUM)) {
 558                 long n;
 559                 int bt = tok_num(&n);
 560                 ts_push_bt(bt);
 561                 o_num(n);
 562                 return;
 563         }
 564         if (!tok_jmp(TOK_STR)) {
 565                 struct type t;
 566                 char buf[BUFSIZE];
 567                 int len;
 568                 t.bt = 1 | BT_SIGNED;
 569                 t.ptr = 1;
 570                 t.addr = 0;
 571                 t.flags = 0;
 572                 ts_push(&t);
 573                 len = tok_str(buf);
 574                 o_sym(tmp_str(buf, len));
 575                 return;
 576         }
 577         if (!tok_jmp(TOK_NAME)) {
 578                 struct name unkn = {""};
 579                 char *name = unkn.name;
 580                 int n;
 581                 strcpy(name, tok_id());
 582                 /* don't search for labels here */
 583                 if (!ncexpr && !caseexpr && tok_see() == ':')
 584                         return;
 585                 for (i = nlocals - 1; i >= 0; --i) {
 586                         struct type *t = &locals[i].type;
 587                         if (!strcmp(locals[i].name, name)) {
 588                                 o_local(locals[i].addr);
 589                                 ts_push_addr(t);
 590                                 return;
 591                         }
 592                 }
 593                 if ((n = global_find(name)) != -1) {
 594                         struct name *g = &globals[n];
 595                         struct type *t = &g->type;
 596                         char *elfname = *g->elfname ? g->elfname : g->name;
 597                         o_sym(elfname);
 598                         ts_push_addr(t);
 599                         return;
 600                 }
 601                 if (!enum_find(&n, name)) {
 602                         ts_push_bt(4 | BT_SIGNED);
 603                         o_num(n);
 604                         return;
 605                 }
 606                 if (tok_see() != '(')
 607                         err("unknown symbol\n");
 608                 global_add(&unkn);
 609                 ts_push_bt(LONGSZ);
 610                 o_sym(unkn.name);
 611                 return;
 612         }
 613         if (!tok_jmp('(')) {
 614                 struct type t;
 615                 if (!readtype(&t)) {
 616                         struct type o;
 617                         tok_expect(')');
 618                         readpre();
 619                         ts_pop_de(&o);
 620                         ts_push(&t);
 621                         if (!t.ptr || !o.ptr)
 622                                 o_cast(TYPE_BT(&t));
 623                 } else {
 624                         readexpr();
 625                         tok_expect(')');
 626                 }
 627                 return;
 628         }
 629 }
 630
 631 static void arrayderef(void)
 632 {
 633         struct type t;
 634         int sz;
 635         ts_pop_de(NULL);
 636         ts_pop(&t);
 637         if (!(t.flags & T_ARRAY) && t.addr) {
 638                 o_tmpswap();
 639                 o_deref(TYPE_BT(&t));
 640                 o_tmpswap();
 641         }
 642         array2ptr(&t);
 643         t.ptr--;
 644         sz = type_totsz(&t);
 645         t.addr = 1;
 646         if (sz > 1) {
 647                 o_num(sz);
 648                 o_bop(O_MUL);
 649         }
 650         o_bop(O_ADD);
 651         ts_push(&t);
 652 }
 653
 654 static void inc_post(int op)
 655 {
 656         struct type t = ts[nts - 1];
 657         /* pushing the value before inc */
 658         o_tmpcopy();
 659         ts_de(1);
 660         o_load();
 661         o_tmpswap();
 662
 663         /* increment by 1 or pointer size */
 664         o_tmpcopy();
 665         ts_push(&t);
 666         ts_pop_de(&t);
 667         o_num(t.ptr > 0 ? type_szde(&t) : 1);
 668         o_bop(op);
 669
 670         /* assign back */
 671         o_assign(TYPE_BT(&t));
 672         o_tmpdrop(1);
 673 }
 674
 675 static void readfield(void)
 676 {
 677         struct name *field;
 678         struct type t;
 679         tok_expect(TOK_NAME);
 680         ts_pop(&t);
 681         array2ptr(&t);
 682         field = struct_field(t.id, tok_id());
 683         if (field->addr) {
 684                 o_num(field->addr);
 685                 o_bop(O_ADD);
 686         }
 687         ts_push_addr(&field->type);
 688 }
 689
 690 #define MAXFUNCS                (1 << 10)
 691
 692 static struct funcinfo {
 693         struct type args[MAXFIELDS];
 694         struct type ret;
 695         int nargs;
 696 } funcs[MAXFUNCS];
 697 static int nfuncs;
 698
 699 static int func_create(struct type *ret, struct name *args, int nargs)
 700 {
 701         struct funcinfo *fi = &funcs[nfuncs++];
 702         int i;
 703         if (nfuncs >= MAXFUNCS)
 704                 err("nomem: MAXFUNCS reached!\n");
 705         memcpy(&fi->ret, ret, sizeof(*ret));
 706         for (i = 0; i < nargs; i++)
 707                 memcpy(&fi->args[i], &args[i].type, sizeof(*ret));
 708         fi->nargs = nargs;
 709         return fi - funcs;
 710 }
 711
 712 static void readcall(void)
 713 {
 714         struct type t;
 715         struct funcinfo *fi;
 716         int argc = 0;
 717         ts_pop(&t);
 718         if (t.flags & T_FUNC && t.ptr > 0)
 719                 o_deref(LONGSZ);
 720         fi = t.flags & T_FUNC ? &funcs[t.id] : NULL;
 721         if (tok_see() != ')') {
 722                 do {
 723                         readexpr();
 724                         ts_pop_de(NULL);
 725                         argc++;
 726                 } while (!tok_jmp(','));
 727         }
 728         tok_expect(')');
 729         o_call(argc, fi ? TYPE_BT(&fi->ret) : 4 | BT_SIGNED);
 730         if (fi) {
 731                 if (TYPE_BT(&fi->ret))
 732                         o_cast(TYPE_BT(&fi->ret));
 733                 ts_push(&fi->ret);
 734         } else {
 735                 ts_push_bt(4 | BT_SIGNED);
 736         }
 737 }
 738
 739 static void readpost(void)
 740 {
 741         readprimary();
 742         while (1) {
 743                 if (!tok_jmp('[')) {
 744                         readexpr();
 745                         tok_expect(']');
 746                         arrayderef();
 747                         continue;
 748                 }
 749                 if (!tok_jmp('(')) {
 750                         readcall();
 751                         continue;
 752                 }
 753                 if (!tok_jmp(TOK2("++"))) {
 754                         inc_post(O_ADD);
 755                         continue;
 756                 }
 757                 if (!tok_jmp(TOK2("--"))) {
 758                         inc_post(O_SUB);
 759                         continue;
 760                 }
 761                 if (!tok_jmp('.')) {
 762                         readfield();
 763                         continue;
 764                 }
 765                 if (!tok_jmp(TOK2("->"))) {
 766                         ts_de(1);
 767                         readfield();
 768                         continue;
 769                 }
 770                 break;
 771         }
 772 }
 773
 774 static void inc_pre(int op)
 775 {
 776         struct type t;
 777         readpre();
 778         /* copy the destination */
 779         o_tmpcopy();
 780         ts_push(&ts[nts - 1]);
 781         /* increment by 1 or pointer size */
 782         ts_pop_de(&t);
 783         o_num(t.ptr > 0 ? type_szde(&t) : 1);
 784         o_bop(op);
 785         /* assign the result */
 786         o_assign(TYPE_BT(&t));
 787         ts_de(0);
 788 }
 789
 790 static void readpre(void)
 791 {
 792         if (!tok_jmp('&')) {
 793                 struct type type;
 794                 readpre();
 795                 ts_pop(&type);
 796                 if (!type.addr)
 797                         die("cannot use the address\n");
 798                 type.ptr++;
 799                 type.addr = 0;
 800                 ts_push(&type);
 801                 return;
 802         }
 803         if (!tok_jmp('*')) {
 804                 struct type t;
 805                 readpre();
 806                 ts_pop(&t);
 807                 array2ptr(&t);
 808                 if (!t.ptr)
 809                         err("dereferencing non-pointer\n");
 810                 if (t.addr)
 811                         o_deref(TYPE_BT(&t));
 812                 t.ptr--;
 813                 t.addr = 1;
 814                 ts_push(&t);
 815                 return;
 816         }
 817         if (!tok_jmp('!')) {
 818                 readpre();
 819                 ts_pop_de(NULL);
 820                 o_uop(O_LNOT);
 821                 ts_push_bt(4 | BT_SIGNED);
 822                 return;
 823         }
 824         if (!tok_jmp('-')) {
 825                 readpre();
 826                 ts_de(1);
 827                 o_uop(O_NEG);
 828                 return;
 829         }
 830         if (!tok_jmp('~')) {
 831                 readpre();
 832                 ts_de(1);
 833                 o_uop(O_NOT);
 834                 return;
 835         }
 836         if (!tok_jmp(TOK2("++"))) {
 837                 inc_pre(O_ADD);
 838                 return;
 839         }
 840         if (!tok_jmp(TOK2("--"))) {
 841                 inc_pre(O_SUB);
 842                 return;
 843         }
 844         if (!tok_jmp(TOK_SIZEOF)) {
 845                 struct type t;
 846                 int op = !tok_jmp('(');
 847                 if (readtype(&t)) {
 848                         o_nogen();
 849                         readexpr();
 850                         o_dogen();
 851                         ts_pop(&t);
 852                         o_tmpdrop(1);
 853                 }
 854                 ts_push_bt(4);
 855                 o_num(type_totsz(&t));
 856                 if (op)
 857                         tok_expect(')');
 858                 return;
 859         }
 860         readpost();
 861 }
 862
 863 static void readmul(void)
 864 {
 865         readpre();
 866         while (1) {
 867                 if (!tok_jmp('*')) {
 868                         readpre();
 869                         ts_binop(O_MUL);
 870                         continue;
 871                 }
 872                 if (!tok_jmp('/')) {
 873                         readpre();
 874                         ts_binop(O_DIV);
 875                         continue;
 876                 }
 877                 if (!tok_jmp('%')) {
 878                         readpre();
 879                         ts_binop(O_MOD);
 880                         continue;
 881                 }
 882                 break;
 883         }
 884 }
 885
 886 static void readadd(void)
 887 {
 888         readmul();
 889         while (1) {
 890                 if (!tok_jmp('+')) {
 891                         readmul();
 892                         ts_addop(O_ADD);
 893                         continue;
 894                 }
 895                 if (!tok_jmp('-')) {
 896                         readmul();
 897                         ts_addop(O_SUB);
 898                         continue;
 899                 }
 900                 break;
 901         }
 902 }
 903
 904 static void shift(int op)
 905 {
 906         struct type t;
 907         readadd();
 908         ts_pop_de2(NULL, &t);
 909         o_bop(op | (BT_SIGNED & TYPE_BT(&t) ? O_SIGNED : 0));
 910         ts_push_bt(TYPE_BT(&t));
 911 }
 912
 913 static void readshift(void)
 914 {
 915         readadd();
 916         while (1) {
 917                 if (!tok_jmp(TOK2("<<"))) {
 918                         shift(O_SHL);
 919                         continue;
 920                 }
 921                 if (!tok_jmp(TOK2(">>"))) {
 922                         shift(O_SHR);
 923                         continue;
 924                 }
 925                 break;
 926         }
 927 }
 928
 929 static void cmp(int op)
 930 {
 931         struct type t1, t2;
 932         int bt;
 933         readshift();
 934         ts_pop_de2(&t1, &t2);
 935         bt = bt_op(TYPE_BT(&t1), TYPE_BT(&t2));
 936         o_bop(op | (bt & BT_SIGNED ? O_SIGNED : 0));
 937         ts_push_bt(4 | BT_SIGNED);
 938 }
 939
 940 static void readcmp(void)
 941 {
 942         readshift();
 943         while (1) {
 944                 if (!tok_jmp('<')) {
 945                         cmp(O_LT);
 946                         continue;
 947                 }
 948                 if (!tok_jmp('>')) {
 949                         cmp(O_GT);
 950                         continue;
 951                 }
 952                 if (!tok_jmp(TOK2("<="))) {
 953                         cmp(O_LE);
 954                         continue;
 955                 }
 956                 if (!tok_jmp(TOK2(">="))) {
 957                         cmp(O_GE);
 958                         continue;
 959                 }
 960                 break;
 961         }
 962 }
 963
 964 static void eq(int op)
 965 {
 966         readcmp();
 967         ts_pop_de2(NULL, NULL);
 968         o_bop(op);
 969         ts_push_bt(4 | BT_SIGNED);
 970 }
 971
 972 static void readeq(void)
 973 {
 974         readcmp();
 975         while (1) {
 976                 if (!tok_jmp(TOK2("=="))) {
 977                         eq(O_EQ);
 978                         continue;
 979                 }
 980                 if (!tok_jmp(TOK2("!="))) {
 981                         eq(O_NEQ);
 982                         continue;
 983                 }
 984                 break;
 985         }
 986 }
 987
 988 static void readbitand(void)
 989 {
 990         readeq();
 991         while (!tok_jmp('&')) {
 992                 readeq();
 993                 ts_binop(O_AND);
 994         }
 995 }
 996
 997 static void readxor(void)
 998 {
 999         readbitand();
1000         while (!tok_jmp('^')) {
1001                 readbitand();
1002                 ts_binop(O_XOR);
1003         }
1004 }
1005
1006 static void readbitor(void)
1007 {
1008         readxor();
1009         while (!tok_jmp('|')) {
1010                 readxor();
1011                 ts_binop(O_OR);
1012         }
1013 }
1014
1015 #define MAXCOND                 (1 << 7)
1016
1017 static void readand(void)
1018 {
1019         long conds[MAXCOND];
1020         int nconds = 0;
1021         long passed;
1022         int i;
1023         readbitor();
1024         if (tok_see() != TOK2("&&"))
1025                 return;
1026         o_fork();
1027         ts_pop_de(NULL);
1028         conds[nconds++] = o_jz(0);
1029         while (!tok_jmp(TOK2("&&"))) {
1030                 readbitor();
1031                 ts_pop_de(NULL);
1032                 conds[nconds++] = o_jz(0);
1033         }
1034         o_num(1);
1035         o_forkpush();
1036         passed = o_jmp(0);
1037         for (i = 0; i < nconds; i++)
1038                 o_filljmp(conds[i]);
1039         o_num(0);
1040         o_forkpush();
1041         o_forkjoin();
1042         o_filljmp(passed);
1043         ts_push_bt(4 | BT_SIGNED);
1044 }
1045
1046 static void reador(void)
1047 {
1048         long conds[MAXCOND];
1049         int nconds = 0;
1050         long failed;
1051         int i;
1052         readand();
1053         if (tok_see() != TOK2("||"))
1054                 return;
1055         o_fork();
1056         ts_pop_de(NULL);
1057         conds[nconds++] = o_jnz(0);
1058         while (!tok_jmp(TOK2("||"))) {
1059                 readand();
1060                 ts_pop_de(NULL);
1061                 conds[nconds++] = o_jnz(0);
1062         }
1063         o_num(0);
1064         o_forkpush();
1065         failed = o_jmp(0);
1066         for (i = 0; i < nconds; i++)
1067                 o_filljmp(conds[i]);
1068         o_num(1);
1069         o_forkpush();
1070         o_forkjoin();
1071         o_filljmp(failed);
1072         ts_push_bt(4 | BT_SIGNED);
1073 }
1074
1075 static int readcexpr_const(void)
1076 {
1077         long c;
1078         if (o_popnum(&c))
1079                 return -1;
1080         if (!c)
1081                 o_nogen();
1082         reador();
1083         ts_pop(NULL);
1084         tok_expect(':');
1085         if (c) {
1086                 o_nogen();
1087         } else {
1088                 o_dogen();
1089                 o_tmpdrop(1);
1090         }
1091         reador();
1092         if (c) {
1093                 o_dogen();
1094                 o_tmpdrop(1);
1095         }
1096         return 0;
1097 }
1098
1099 static void readcexpr(void)
1100 {
1101         long l1, l2;
1102         reador();
1103         if (tok_jmp('?'))
1104                 return;
1105         ncexpr++;
1106         ts_pop_de(NULL);
1107         o_fork();
1108         if (readcexpr_const()) {
1109                 l1 = o_jz(0);
1110                 reador();
1111                 ts_de(1);
1112                 o_forkpush();
1113                 l2 = o_jmp(0);
1114                 ts_pop(NULL);
1115
1116                 tok_expect(':');
1117                 o_filljmp(l1);
1118                 reador();
1119                 ts_de(1);
1120                 o_forkpush();
1121                 o_forkjoin();
1122                 o_filljmp(l2);
1123         }
1124         ncexpr--;
1125 }
1126
1127 static void opassign(int op, int ptrop)
1128 {
1129         struct type t = ts[nts - 1];
1130         o_tmpcopy();
1131         ts_push(&t);
1132         readexpr();
1133         ts_addop(op);
1134         o_assign(TYPE_BT(&ts[nts - 1]));
1135         ts_pop(NULL);
1136         ts_de(0);
1137 }
1138
1139 static void doassign(void)
1140 {
1141         struct type t = ts[nts - 1];
1142         if (!t.ptr && t.flags & T_STRUCT) {
1143                 ts_pop(NULL);
1144                 o_num(type_totsz(&t));
1145                 o_memcpy();
1146         } else {
1147                 ts_pop_de(NULL);
1148                 o_assign(TYPE_BT(&ts[nts - 1]));
1149                 ts_de(0);
1150         }
1151 }
1152
1153 static void readexpr(void)
1154 {
1155         readcexpr();
1156         if (!tok_jmp('=')) {
1157                 readexpr();
1158                 doassign();
1159                 return;
1160         }
1161         if (!tok_jmp(TOK2("+="))) {
1162                 opassign(O_ADD, 1);
1163                 return;
1164         }
1165         if (!tok_jmp(TOK2("-="))) {
1166                 opassign(O_SUB, 1);
1167                 return;
1168         }
1169         if (!tok_jmp(TOK2("*="))) {
1170                 opassign(O_MUL, 0);
1171                 return;
1172         }
1173         if (!tok_jmp(TOK2("/="))) {
1174                 opassign(O_DIV, 0);
1175                 return;
1176         }
1177         if (!tok_jmp(TOK2("%="))) {
1178                 opassign(O_MOD, 0);
1179                 return;
1180         }
1181         if (!tok_jmp(TOK3("<<="))) {
1182                 opassign(O_SHL, 0);
1183                 return;
1184         }
1185         if (!tok_jmp(TOK3(">>="))) {
1186                 opassign(O_SHR, 0);
1187                 return;
1188         }
1189         if (!tok_jmp(TOK3("&="))) {
1190                 opassign(O_AND, 0);
1191                 return;
1192         }
1193         if (!tok_jmp(TOK3("|="))) {
1194                 opassign(O_OR, 0);
1195                 return;
1196         }
1197         if (!tok_jmp(TOK3("^="))) {
1198                 opassign(O_XOR, 0);
1199                 return;
1200         }
1201 }
1202
1203 static void readestmt(void)
1204 {
1205         do {
1206                 o_tmpdrop(-1);
1207                 nts = 0;
1208                 readexpr();
1209         } while (!tok_jmp(','));
1210 }
1211
1212 static void o_localoff(long addr, int off)
1213 {
1214         o_local(addr);
1215         if (off) {
1216                 o_num(off);
1217                 o_bop(O_ADD);
1218         }
1219 }
1220
1221 static struct type *innertype(struct type *t)
1222 {
1223         if (t->flags & T_ARRAY && !t->ptr)
1224                 return innertype(&arrays[t->id].type);
1225         return t;
1226 }
1227
1228 static void initexpr(struct type *t, int off, void *obj,
1229                 void (*set)(void *obj, int off, struct type *t))
1230 {
1231         if (tok_jmp('{')) {
1232                 set(obj, off, t);
1233                 return;
1234         }
1235         if (!t->ptr && t->flags & T_STRUCT) {
1236                 struct structinfo *si = &structs[t->id];
1237                 int i;
1238                 for (i = 0; i < si->nfields; i++) {
1239                         struct name *field = &si->fields[i];
1240                         if (!tok_jmp('.')) {
1241                                 tok_expect(TOK_NAME);
1242                                 field = struct_field(t->id, tok_id());
1243                                 tok_expect('=');
1244                         }
1245                         initexpr(&field->type, off + field->addr, obj, set);
1246                         if (tok_jmp(',') || tok_see() == '}')
1247                                 break;
1248                 }
1249         } else if (t->flags & T_ARRAY) {
1250                 struct type *t_de = &arrays[t->id].type;
1251                 int i;
1252                 for (i = 0; ; i++) {
1253                         long idx = i;
1254                         struct type *it = t_de;
1255                         if (!tok_jmp('[')) {
1256                                 readexpr();
1257                                 o_popnum(&idx);
1258                                 ts_pop(NULL);
1259                                 tok_expect(']');
1260                                 tok_expect('=');
1261                         }
1262                         if (tok_see() != '{')
1263                                 it = innertype(t_de);
1264                         initexpr(it, off + type_totsz(it) * idx, obj, set);
1265                         if (tok_jmp(',') || tok_see() == '}')
1266                                 break;
1267                 }
1268         }
1269         tok_expect('}');
1270 }
1271
1272 static void jumpbrace(void)
1273 {
1274         int depth = 0;
1275         while (tok_see() != '}' || depth--)
1276                 if (tok_get() == '{')
1277                         depth++;
1278         tok_expect('}');
1279 }
1280
1281 static int initsize(void)
1282 {
1283         long addr = tok_addr();
1284         int n = 0;
1285         if (!tok_jmp(TOK_STR)) {
1286                 n = tok_str(NULL);
1287                 tok_jump(addr);
1288                 return n;
1289         }
1290         o_nogen();
1291         tok_expect('{');
1292         while (tok_jmp('}')) {
1293                 long idx = n;
1294                 if (!tok_jmp('[')) {
1295                         readexpr();
1296                         o_popnum(&idx);
1297                         ts_pop(NULL);
1298                         tok_expect(']');
1299                         tok_expect('=');
1300                 }
1301                 if (n < idx + 1)
1302                         n = idx + 1;
1303                 while (tok_see() != '}' && tok_see() != ',')
1304                         if (tok_get() == '{')
1305                                 jumpbrace();
1306                 tok_jmp(',');
1307         }
1308         o_dogen();
1309         tok_jump(addr);
1310         return n;
1311 }
1312
1313 #define F_GLOBAL(flags)         (!((flags) & F_STATIC))
1314
1315 static void globalinit(void *obj, int off, struct type *t)
1316 {
1317         struct name *name = obj;
1318         char *elfname = *name->elfname ? name->elfname : name->name;
1319         if (t->flags & T_ARRAY && tok_see() == TOK_STR) {
1320                 struct type *t_de = &arrays[t->id].type;
1321                 if (!t_de->ptr && !t_de->flags && TYPE_SZ(t_de) == 1) {
1322                         char buf[BUFSIZE];
1323                         int len;
1324                         tok_expect(TOK_STR);
1325                         len = tok_str(buf);
1326                         memcpy((void *) name->addr + off, buf, len);
1327                         return;
1328                 }
1329         }
1330         readexpr();
1331         o_datset(elfname, off, TYPE_BT(t));
1332         ts_pop(NULL);
1333 }
1334
1335 static void globaldef(void *data, struct name *name, unsigned flags)
1336 {
1337         struct type *t = &name->type;
1338         char *elfname = *name->elfname ? name->elfname : name->name;
1339         int sz;
1340         if (t->flags & T_ARRAY && !t->ptr && !arrays[t->id].n)
1341                 if (~flags & F_EXTERN)
1342                         arrays[t->id].n = initsize();
1343         sz = type_totsz(t);
1344         if (!(flags & F_EXTERN) && (!(t->flags & T_FUNC) || t->ptr)) {
1345                 if (flags & F_INIT)
1346                         name->addr = (long) dat_dat(elfname, sz, F_GLOBAL(flags));
1347                 else
1348                         dat_bss(elfname, sz, F_GLOBAL(flags));
1349         }
1350         global_add(name);
1351         if (flags & F_INIT)
1352                 initexpr(t, 0, name, globalinit);
1353 }
1354
1355 static void localinit(void *obj, int off, struct type *t)
1356 {
1357         long addr = *(long *) obj;
1358         if (t->flags & T_ARRAY && tok_see() == TOK_STR) {
1359                 struct type *t_de = &arrays[t->id].type;
1360                 if (!t_de->ptr && !t_de->flags && TYPE_SZ(t_de) == 1) {
1361                         char buf[BUFSIZE];
1362                         int len;
1363                         tok_expect(TOK_STR);
1364                         len = tok_str(buf);
1365                         o_localoff(addr, off);
1366                         o_sym(tmp_str(buf, len));
1367                         o_num(len);
1368                         o_memcpy();
1369                         o_tmpdrop(1);
1370                         return;
1371                 }
1372         }
1373         o_localoff(addr, off);
1374         ts_push(t);
1375         readexpr();
1376         doassign();
1377         ts_pop(NULL);
1378         o_tmpdrop(1);
1379 }
1380
1381 /* current function name */
1382 static char func_name[NAMELEN];
1383
1384 static void localdef(void *data, struct name *name, unsigned flags)
1385 {
1386         struct type *t = &name->type;
1387         if (flags & (F_STATIC | F_EXTERN)) {
1388                 sprintf(name->elfname, "__neatcc.%s.%s", func_name, name->name);
1389                 globaldef(data, name, flags);
1390                 return;
1391         }
1392         if (t->flags & T_ARRAY && !t->ptr && !arrays[t->id].n)
1393                 arrays[t->id].n = initsize();
1394         name->addr = o_mklocal(type_totsz(&name->type));
1395         local_add(name);
1396         if (flags & F_INIT) {
1397                 if (t->flags & (T_ARRAY | T_STRUCT) && !t->ptr) {
1398                         o_local(name->addr);
1399                         o_num(0);
1400                         o_num(type_totsz(t));
1401                         o_memset();
1402                         o_tmpdrop(1);
1403                 }
1404                 initexpr(t, 0, &name->addr, localinit);
1405         }
1406 }
1407
1408 static void funcdef(char *name, struct type *type, struct name *args,
1409                         int nargs, unsigned flags)
1410 {
1411         struct name global = {""};
1412         int i;
1413         strcpy(global.name, name);
1414         strcpy(func_name, name);
1415         memcpy(&global.type, type, sizeof(*type));
1416         o_func_beg(name, F_GLOBAL(flags));
1417         global_add(&global);
1418         for (i = 0; i < nargs; i++) {
1419                 args[i].addr = o_arg(i);
1420                 local_add(&args[i]);
1421         }
1422 }
1423
1424 static int readargs(struct name *args)
1425 {
1426         int nargs = 0;
1427         tok_expect('(');
1428         while (tok_see() != ')') {
1429                 if (!tok_jmp(TOK3("...")))
1430                         break;
1431                 readname(&args[nargs].type, args[nargs].name, NULL, 0);
1432                 array2ptr(&args[nargs].type);
1433                 nargs++;
1434                 if (tok_jmp(','))
1435                         break;
1436         }
1437         tok_expect(')');
1438         if (nargs == 1 && !TYPE_BT(&args[0].type))
1439                 return 0;
1440         return nargs;
1441 }
1442
1443 static int readname(struct type *main, char *name,
1444                         struct type *base, unsigned flags)
1445 {
1446         struct type tpool[3];
1447         int npool = 0;
1448         struct type *type = &tpool[npool++];
1449         struct type *func = NULL;
1450         struct type *ret = NULL;
1451         int arsz[10];
1452         int nar = 0;
1453         int i;
1454         memset(tpool, 0, sizeof(tpool));
1455         if (name)
1456                 *name = '\0';
1457         if (!base) {
1458                 if (basetype(type, &flags))
1459                         return 1;
1460         } else {
1461                 memcpy(type, base, sizeof(*base));
1462         }
1463         readptrs(type);
1464         if (!tok_jmp('(')) {
1465                 ret = type;
1466                 type = &tpool[npool++];
1467                 func = type;
1468                 readptrs(type);
1469         }
1470         if (!tok_jmp(TOK_NAME) && name)
1471                 strcpy(name, tok_id());
1472         while (!tok_jmp('[')) {
1473                 long n = 0;
1474                 if (tok_jmp(']')) {
1475                         readexpr();
1476                         ts_pop(NULL);
1477                         if (o_popnum(&n))
1478                                 err("const expr expected\n");
1479                         tok_expect(']');
1480                 }
1481                 arsz[nar++] = n;
1482         }
1483         for (i = nar - 1; i >= 0; i--) {
1484                 type->id = array_add(type, arsz[i]);
1485                 if (func && i == nar - 1)
1486                         func = &arrays[type->id].type;
1487                 type->flags = T_ARRAY;
1488                 type->bt = LONGSZ;
1489                 type->ptr = 0;
1490         }
1491         if (func)
1492                 tok_expect(')');
1493         if (tok_see() == '(') {
1494                 struct name args[MAXARGS] = {{""}};
1495                 int nargs = readargs(args);
1496                 int fdef = !func;
1497                 if (!func) {
1498                         ret = type;
1499                         type = &tpool[npool++];
1500                         func = type;
1501                 }
1502                 func->flags = T_FUNC;
1503                 func->bt = LONGSZ;
1504                 func->id = func_create(ret, args, nargs);
1505                 if (fdef && tok_see() == '{') {
1506                         funcdef(name, func, args, nargs, flags);
1507                         return 1;
1508                 }
1509         }
1510         memcpy(main, type, sizeof(*type));
1511         return 0;
1512 }
1513
1514 static int readdefs(void (*def)(void *data, struct name *name, unsigned flags),
1515                         void *data)
1516 {
1517         struct type base;
1518         unsigned base_flags;
1519         if (basetype(&base, &base_flags))
1520                 return 1;
1521         while (tok_see() != ';' && tok_see() != '{') {
1522                 struct name name = {{""}};
1523                 unsigned flags = base_flags;
1524                 if (readname(&name.type, name.name, &base, flags))
1525                         break;
1526                 if (!tok_jmp('='))
1527                         flags |= F_INIT;
1528                 def(data, &name, flags);
1529                 tok_jmp(',');
1530         }
1531         return 0;
1532 }
1533
1534 static void typedefdef(void *data, struct name *name, unsigned flags)
1535 {
1536         typedef_add(name->name, &name->type);
1537 }
1538
1539 static void readstmt(void);
1540
1541 #define MAXCASES                (1 << 7)
1542
1543 static void readswitch(void)
1544 {
1545         int break_beg = nbreaks;
1546         long val_addr = o_mklocal(LONGSZ);
1547         long matched[MAXCASES];
1548         int nmatched = 0;
1549         struct type t;
1550         long next;
1551         int ref = 1;
1552         int i;
1553         tok_expect('(');
1554         readexpr();
1555         ts_pop_de(&t);
1556         o_local(val_addr);
1557         o_tmpswap();
1558         o_assign(TYPE_BT(&t));
1559         ts_de(0);
1560         o_tmpdrop(1);
1561         tok_expect(')');
1562         tok_expect('{');
1563         while (tok_jmp('}')) {
1564                 int n = 0;
1565                 while (tok_see() == TOK_CASE || tok_see() == TOK_DEFAULT) {
1566                         if (n++ > 0)
1567                                 matched[nmatched++] = o_jmp(0);
1568                         if (!ref++)
1569                                 o_filljmp(next);
1570                         if (!tok_jmp(TOK_CASE)) {
1571                                 caseexpr = 1;
1572                                 readexpr();
1573                                 ts_pop_de(NULL);
1574                                 caseexpr = 0;
1575                                 o_local(val_addr);
1576                                 o_deref(TYPE_BT(&t));
1577                                 o_bop(O_EQ);
1578                                 next = o_jz(0);
1579                                 ref = 0;
1580                                 tok_expect(':');
1581                                 o_tmpdrop(1);
1582                                 continue;
1583                         }
1584                         if (!tok_jmp(TOK_DEFAULT)) {
1585                                 tok_expect(':');
1586                                 continue;
1587                         }
1588                 }
1589                 for (i = 0; i < nmatched; i++)
1590                         o_filljmp(matched[i]);
1591                 nmatched = 0;
1592                 readstmt();
1593         }
1594         o_rmlocal(val_addr, LONGSZ);
1595         if (!ref++)
1596                 o_filljmp(next);
1597         break_fill(o_mklabel(), break_beg);
1598 }
1599
1600 #define MAXGOTO                 (1 << 10)
1601
1602 static struct gotoinfo {
1603         char name[NAMELEN];
1604         long addr;
1605 } gotos[MAXGOTO];
1606 static int ngotos;
1607
1608 static struct labelinfo {
1609         char name[NAMELEN];
1610         long addr;
1611 } labels[MAXGOTO];
1612 static int nlabels;
1613
1614 static void goto_add(char *name)
1615 {
1616         strcpy(gotos[ngotos].name, name);
1617         gotos[ngotos++].addr = o_jmp(0);
1618 }
1619
1620 static void label_add(char *name)
1621 {
1622         strcpy(labels[nlabels].name, name);
1623         labels[nlabels++].addr = o_mklabel();
1624 }
1625
1626 static void goto_fill(void)
1627 {
1628         int i, j;
1629         for (i = 0; i < ngotos; i++)
1630                 for (j = 0; j < nlabels; j++)
1631                         if (!strcmp(gotos[i].name, labels[j].name)) {
1632                                 o_filljmp2(gotos[i].addr, labels[j].addr);
1633                                 break;
1634                         }
1635 }
1636
1637 static void readstmt(void)
1638 {
1639         o_tmpdrop(-1);
1640         nts = 0;
1641         if (!tok_jmp('{')) {
1642                 int _nlocals = nlocals;
1643                 int _nglobals = nglobals;
1644                 int _nenums = nenums;
1645                 int _ntypedefs = ntypedefs;
1646                 int _nstructs = nstructs;
1647                 int _nfuncs = nfuncs;
1648                 int _narrays = narrays;
1649                 while (tok_jmp('}'))
1650                         readstmt();
1651                 nlocals = _nlocals;
1652                 nenums = _nenums;
1653                 ntypedefs = _ntypedefs;
1654                 nstructs = _nstructs;
1655                 nfuncs = _nfuncs;
1656                 narrays = _narrays;
1657                 nglobals = _nglobals;
1658                 return;
1659         }
1660         if (!readdefs(localdef, NULL)) {
1661                 tok_expect(';');
1662                 return;
1663         }
1664         if (!tok_jmp(TOK_TYPEDEF)) {
1665                 readdefs(typedefdef, NULL);
1666                 tok_expect(';');
1667                 return;
1668         }
1669         if (!tok_jmp(TOK_IF)) {
1670                 long l1, l2;
1671                 tok_expect('(');
1672                 readexpr();
1673                 tok_expect(')');
1674                 ts_pop_de(NULL);
1675                 l1 = o_jz(0);
1676                 readstmt();
1677                 if (!tok_jmp(TOK_ELSE)) {
1678                         l2 = o_jmp(0);
1679                         o_filljmp(l1);
1680                         readstmt();
1681                         o_filljmp(l2);
1682                 } else {
1683                         o_filljmp(l1);
1684                 }
1685                 return;
1686         }
1687         if (!tok_jmp(TOK_WHILE)) {
1688                 long l1, l2;
1689                 int break_beg = nbreaks;
1690                 int continue_beg = ncontinues;
1691                 l1 = o_mklabel();
1692                 tok_expect('(');
1693                 readexpr();
1694                 tok_expect(')');
1695                 ts_pop_de(NULL);
1696                 l2 = o_jz(0);
1697                 readstmt();
1698                 o_jmp(l1);
1699                 o_filljmp(l2);
1700                 break_fill(o_mklabel(), break_beg);
1701                 continue_fill(l1, continue_beg);
1702                 return;
1703         }
1704         if (!tok_jmp(TOK_DO)) {
1705                 long l1, l2;
1706                 int break_beg = nbreaks;
1707                 int continue_beg = ncontinues;
1708                 l1 = o_mklabel();
1709                 readstmt();
1710                 tok_expect(TOK_WHILE);
1711                 tok_expect('(');
1712                 l2 = o_mklabel();
1713                 readexpr();
1714                 ts_pop_de(NULL);
1715                 o_jnz(l1);
1716                 tok_expect(')');
1717                 break_fill(o_mklabel(), break_beg);
1718                 continue_fill(l2, continue_beg);
1719                 return;
1720         }
1721         if (!tok_jmp(TOK_FOR)) {
1722                 long l_check, l_jump, j_fail, j_pass;
1723                 int break_beg = nbreaks;
1724                 int continue_beg = ncontinues;
1725                 int has_cond = 0;
1726                 tok_expect('(');
1727                 if (tok_see() != ';')
1728                         readestmt();
1729                 tok_expect(';');
1730                 l_check = o_mklabel();
1731                 if (tok_see() != ';') {
1732                         readestmt();
1733                         ts_pop_de(NULL);
1734                         j_fail = o_jz(0);
1735                         has_cond = 1;
1736                 }
1737                 tok_expect(';');
1738                 j_pass = o_jmp(0);
1739                 l_jump = o_mklabel();
1740                 if (tok_see() != ')')
1741                         readestmt();
1742                 tok_expect(')');
1743                 o_jmp(l_check);
1744                 o_filljmp(j_pass);
1745                 readstmt();
1746                 o_jmp(l_jump);
1747                 if (has_cond)
1748                         o_filljmp(j_fail);
1749                 break_fill(o_mklabel(), break_beg);
1750                 continue_fill(l_jump, continue_beg);
1751                 return;
1752         }
1753         if (!tok_jmp(TOK_SWITCH)) {
1754                 readswitch();
1755                 return;
1756         }
1757         if (!tok_jmp(TOK_RETURN)) {
1758                 int ret = tok_see() != ';';
1759                 if (ret) {
1760                         readexpr();
1761                         ts_pop_de(NULL);
1762                 }
1763                 tok_expect(';');
1764                 o_ret(ret);
1765                 return;
1766         }
1767         if (!tok_jmp(TOK_BREAK)) {
1768                 tok_expect(';');
1769                 breaks[nbreaks++] = o_jmp(0);
1770                 return;
1771         }
1772         if (!tok_jmp(TOK_CONTINUE)) {
1773                 tok_expect(';');
1774                 continues[ncontinues++] = o_jmp(0);
1775                 return;
1776         }
1777         if (!tok_jmp(TOK_GOTO)) {
1778                 tok_expect(TOK_NAME);
1779                 goto_add(tok_id());
1780                 tok_expect(';');
1781                 return;
1782         }
1783         readestmt();
1784         /* labels */
1785         if (!tok_jmp(':')) {
1786                 label_add(tok_id());
1787                 return;
1788         }
1789         tok_expect(';');
1790 }
1791
1792 static void readdecl(void)
1793 {
1794         if (!tok_jmp(TOK_TYPEDEF)) {
1795                 readdefs(typedefdef, NULL);
1796                 tok_expect(';');
1797                 return;
1798         }
1799         readdefs(globaldef, NULL);
1800         if (tok_see() == '{') {
1801                 readstmt();
1802                 goto_fill();
1803                 o_func_end();
1804                 func_name[0] = '\0';
1805                 nlocals = 0;
1806                 ngotos = 0;
1807                 nlabels = 0;
1808                 return;
1809         }
1810         tok_expect(';');
1811 }
1812
1813 static void parse(void)
1814 {
1815         while (tok_see() != TOK_EOF)
1816                 readdecl();
1817 }
1818
1819 int main(int argc, char *argv[])
1820 {
1821         char obj[128];
1822         int ofd;
1823         int i = 1;
1824         while (i < argc && argv[i][0] == '-') {
1825                 if (argv[i][1] == 'I')
1826                         cpp_addpath(argv[i][2] ? argv[i] + 2 : argv[++i]);
1827                 if (argv[i][1] == 'D') {
1828                         char *name = argv[i] + 2;
1829                         char *def = "";
1830                         char *eq = strchr(name, '=');
1831                         if (eq) {
1832                                 *eq = '\0';
1833                                 def = eq + 1;
1834                         }
1835                         cpp_define(name, def);
1836                 }
1837                 i++;
1838         }
1839         if (i == argc)
1840                 die("neatcc: no file given\n");
1841         if (cpp_init(argv[i]))
1842                 die("neatcc: cannot open input file\n");
1843         parse();
1844         strcpy(obj, argv[i]);
1845         obj[strlen(obj) - 1] = 'o';
1846         ofd = open(obj, O_WRONLY | O_TRUNC | O_CREAT, 0600);
1847         o_write(ofd);
1848         close(ofd);
1849         return 0;
1850 }