ncc.c

   1 /*
   2  * neatcc - a small and simple C compiler
   3  *
   4  * Copyright (C) 2010-2011 Ali Gholami Rudi
   5  *
   6  * This program 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->ptr || !(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_jmp('=')) {
 425                         readexpr();
 426                         ts_pop(NULL);
 427                         if (o_popnum(&n))
 428                                 err("const expr expected!\n");
 429                 }
 430                 enum_add(name, n++);
 431                 tok_jmp(',');
 432         }
 433 }
 434
 435 static int basetype(struct type *type, unsigned *flags)
 436 {
 437         int sign = 1;
 438         int size = 4;
 439         int done = 0;
 440         int i = 0;
 441         int isunion;
 442         char name[NAMELEN] = "";
 443         *flags = 0;
 444         type->flags = 0;
 445         type->ptr = 0;
 446         type->addr = 0;
 447         while (!done) {
 448                 switch (tok_see()) {
 449                 case TOK_STATIC:
 450                         *flags |= F_STATIC;
 451                         break;
 452                 case TOK_EXTERN:
 453                         *flags |= F_EXTERN;
 454                         break;
 455                 case TOK_VOID:
 456                         sign = 0;
 457                         size = 0;
 458                         done = 1;
 459                         break;
 460                 case TOK_INT:
 461                         done = 1;
 462                         break;
 463                 case TOK_CHAR:
 464                         size = 1;
 465                         done = 1;
 466                         break;
 467                 case TOK_SHORT:
 468                         size = 2;
 469                         break;
 470                 case TOK_LONG:
 471                         size = LONGSZ;
 472                         break;
 473                 case TOK_SIGNED:
 474                         break;
 475                 case TOK_UNSIGNED:
 476                         sign = 0;
 477                         break;
 478                 case TOK_UNION:
 479                 case TOK_STRUCT:
 480                         isunion = tok_get() == TOK_UNION;
 481                         if (!tok_jmp(TOK_NAME))
 482                                 strcpy(name, tok_id());
 483                         if (tok_see() == '{')
 484                                 type->id = struct_create(name, isunion);
 485                         else
 486                                 type->id = struct_find(name, isunion);
 487                         type->flags |= T_STRUCT;
 488                         type->bt = LONGSZ;
 489                         return 0;
 490                 case TOK_ENUM:
 491                         tok_get();
 492                         tok_jmp(TOK_NAME);
 493                         if (tok_see() == '{')
 494                                 enum_create();
 495                         type->bt = 4 | BT_SIGNED;
 496                         return 0;
 497                 default:
 498                         if (tok_see() == TOK_NAME) {
 499                                 int id = typedef_find(tok_id());
 500                                 if (id != -1) {
 501                                         tok_get();
 502                                         memcpy(type, &typedefs[id].type,
 503                                                 sizeof(*type));
 504                                         return 0;
 505                                 }
 506                         }
 507                         if (!i)
 508                                 return 1;
 509                         done = 1;
 510                         continue;
 511                 }
 512                 i++;
 513                 tok_get();
 514         }
 515         type->bt = size | (sign ? BT_SIGNED : 0);
 516         return 0;
 517 }
 518
 519 static int readname(struct type *main, char *name,
 520                         struct type *base, unsigned flags);
 521
 522 static int readtype(struct type *type)
 523 {
 524         return readname(type, NULL, NULL, 0);
 525 }
 526
 527 static void readptrs(struct type *type)
 528 {
 529         while (!tok_jmp('*')) {
 530                 type->ptr++;
 531                 if (!type->bt)
 532                         type->bt = 1;
 533         }
 534 }
 535
 536 /* used to differenciate labels from case and cond exprs */
 537 static int ncexpr;
 538 static int caseexpr;
 539
 540 static void readpre(void);
 541
 542 static char *tmp_str(char *buf, int len)
 543 {
 544         static char name[NAMELEN];
 545         static int id;
 546         void *dat;
 547         sprintf(name, "__neatcc.s%d", id++);
 548         dat = o_mkdat(name, len, 0);
 549         memcpy(dat, buf, len);
 550         return name;
 551 }
 552
 553 static void readprimary(void)
 554 {
 555         int i;
 556         if (!tok_jmp(TOK_NUM)) {
 557                 long n;
 558                 int bt = tok_num(&n);
 559                 ts_push_bt(bt);
 560                 o_num(n);
 561                 return;
 562         }
 563         if (!tok_jmp(TOK_STR)) {
 564                 struct type t;
 565                 char buf[BUFSIZE];
 566                 int len;
 567                 t.bt = 1 | BT_SIGNED;
 568                 t.ptr = 1;
 569                 t.addr = 0;
 570                 t.flags = 0;
 571                 ts_push(&t);
 572                 len = tok_str(buf);
 573                 o_sym(tmp_str(buf, len));
 574                 return;
 575         }
 576         if (!tok_jmp(TOK_NAME)) {
 577                 struct name unkn = {""};
 578                 char *name = unkn.name;
 579                 int n;
 580                 strcpy(name, tok_id());
 581                 /* don't search for labels here */
 582                 if (!ncexpr && !caseexpr && tok_see() == ':')
 583                         return;
 584                 for (i = nlocals - 1; i >= 0; --i) {
 585                         struct type *t = &locals[i].type;
 586                         if (!strcmp(locals[i].name, name)) {
 587                                 o_local(locals[i].addr);
 588                                 ts_push_addr(t);
 589                                 return;
 590                         }
 591                 }
 592                 if ((n = global_find(name)) != -1) {
 593                         struct name *g = &globals[n];
 594                         struct type *t = &g->type;
 595                         char *elfname = *g->elfname ? g->elfname : g->name;
 596                         o_sym(elfname);
 597                         ts_push_addr(t);
 598                         return;
 599                 }
 600                 if (!enum_find(&n, name)) {
 601                         ts_push_bt(4 | BT_SIGNED);
 602                         o_num(n);
 603                         return;
 604                 }
 605                 if (tok_see() != '(')
 606                         err("unknown symbol\n");
 607                 global_add(&unkn);
 608                 ts_push_bt(LONGSZ);
 609                 o_sym(unkn.name);
 610                 return;
 611         }
 612         if (!tok_jmp('(')) {
 613                 struct type t;
 614                 if (!readtype(&t)) {
 615                         struct type o;
 616                         tok_expect(')');
 617                         readpre();
 618                         ts_pop_de(&o);
 619                         ts_push(&t);
 620                         if (!t.ptr || !o.ptr)
 621                                 o_cast(TYPE_BT(&t));
 622                 } else {
 623                         readexpr();
 624                         tok_expect(')');
 625                 }
 626                 return;
 627         }
 628 }
 629
 630 static void arrayderef(void)
 631 {
 632         struct type t;
 633         int sz;
 634         ts_pop_de(NULL);
 635         ts_pop(&t);
 636         if (!(t.flags & T_ARRAY) && t.addr) {
 637                 o_tmpswap();
 638                 o_deref(TYPE_BT(&t));
 639                 o_tmpswap();
 640         }
 641         array2ptr(&t);
 642         t.ptr--;
 643         sz = type_totsz(&t);
 644         t.addr = 1;
 645         if (sz > 1) {
 646                 o_num(sz);
 647                 o_bop(O_MUL);
 648         }
 649         o_bop(O_ADD);
 650         ts_push(&t);
 651 }
 652
 653 static void inc_post(int op)
 654 {
 655         struct type t = ts[nts - 1];
 656         /* pushing the value before inc */
 657         o_tmpcopy();
 658         ts_de(1);
 659         o_load();
 660         o_tmpswap();
 661
 662         /* increment by 1 or pointer size */
 663         o_tmpcopy();
 664         ts_push(&t);
 665         ts_pop_de(&t);
 666         o_num(t.ptr > 0 ? type_szde(&t) : 1);
 667         o_bop(op);
 668
 669         /* assign back */
 670         o_assign(TYPE_BT(&t));
 671         o_tmpdrop(1);
 672 }
 673
 674 static void readfield(void)
 675 {
 676         struct name *field;
 677         struct type t;
 678         tok_expect(TOK_NAME);
 679         ts_pop(&t);
 680         array2ptr(&t);
 681         field = struct_field(t.id, tok_id());
 682         if (field->addr) {
 683                 o_num(field->addr);
 684                 o_bop(O_ADD);
 685         }
 686         ts_push_addr(&field->type);
 687 }
 688
 689 #define MAXFUNCS                (1 << 10)
 690
 691 static struct funcinfo {
 692         struct type args[MAXFIELDS];
 693         struct type ret;
 694         int nargs;
 695         int varg;
 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) o_mkdat(elfname, sz, F_GLOBAL(flags));
1347                 else
1348                         o_mkbss(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_EXTERN) || (t->flags & T_FUNC) && !t->ptr) {
1388                 global_add(name);
1389                 return;
1390         }
1391         if (flags & F_STATIC) {
1392                 sprintf(name->elfname, "__neatcc.%s.%s", func_name, name->name);
1393                 globaldef(data, name, flags);
1394                 return;
1395         }
1396         if (t->flags & T_ARRAY && !t->ptr && !arrays[t->id].n)
1397                 arrays[t->id].n = initsize();
1398         name->addr = o_mklocal(type_totsz(&name->type));
1399         local_add(name);
1400         if (flags & F_INIT) {
1401                 if (t->flags & (T_ARRAY | T_STRUCT) && !t->ptr) {
1402                         o_local(name->addr);
1403                         o_num(0);
1404                         o_num(type_totsz(t));
1405                         o_memset();
1406                         o_tmpdrop(1);
1407                 }
1408                 initexpr(t, 0, &name->addr, localinit);
1409         }
1410 }
1411
1412 static void funcdef(char *name, struct type *type, struct name *args,
1413                         int nargs, int varg, unsigned flags)
1414 {
1415         struct name global = {""};
1416         int i;
1417         strcpy(global.name, name);
1418         strcpy(func_name, name);
1419         memcpy(&global.type, type, sizeof(*type));
1420         o_func_beg(name, nargs, F_GLOBAL(flags), varg);
1421         global_add(&global);
1422         for (i = 0; i < nargs; i++) {
1423                 args[i].addr = o_arg2loc(i);
1424                 local_add(&args[i]);
1425         }
1426 }
1427
1428 static int readargs(struct name *args, int *varg)
1429 {
1430         int nargs = 0;
1431         tok_expect('(');
1432         *varg = 0;
1433         while (tok_see() != ')') {
1434                 if (!tok_jmp(TOK3("..."))) {
1435                         *varg = 1;
1436                         break;
1437                 }
1438                 readname(&args[nargs].type, args[nargs].name, NULL, 0);
1439                 array2ptr(&args[nargs].type);
1440                 nargs++;
1441                 if (tok_jmp(','))
1442                         break;
1443         }
1444         tok_expect(')');
1445         if (nargs == 1 && !TYPE_BT(&args[0].type))
1446                 return 0;
1447         return nargs;
1448 }
1449
1450 static int readname(struct type *main, char *name,
1451                         struct type *base, unsigned flags)
1452 {
1453         struct type tpool[3];
1454         int npool = 0;
1455         struct type *type = &tpool[npool++];
1456         struct type *func = NULL;
1457         struct type *ret = NULL;
1458         int arsz[10];
1459         int nar = 0;
1460         int i;
1461         memset(tpool, 0, sizeof(tpool));
1462         if (name)
1463                 *name = '\0';
1464         if (!base) {
1465                 if (basetype(type, &flags))
1466                         return 1;
1467         } else {
1468                 memcpy(type, base, sizeof(*base));
1469         }
1470         readptrs(type);
1471         if (!tok_jmp('(')) {
1472                 ret = type;
1473                 type = &tpool[npool++];
1474                 func = type;
1475                 readptrs(type);
1476         }
1477         if (!tok_jmp(TOK_NAME) && name)
1478                 strcpy(name, tok_id());
1479         while (!tok_jmp('[')) {
1480                 long n = 0;
1481                 if (tok_jmp(']')) {
1482                         readexpr();
1483                         ts_pop(NULL);
1484                         if (o_popnum(&n))
1485                                 err("const expr expected\n");
1486                         tok_expect(']');
1487                 }
1488                 arsz[nar++] = n;
1489         }
1490         for (i = nar - 1; i >= 0; i--) {
1491                 type->id = array_add(type, arsz[i]);
1492                 if (func && i == nar - 1)
1493                         func = &arrays[type->id].type;
1494                 type->flags = T_ARRAY;
1495                 type->bt = LONGSZ;
1496                 type->ptr = 0;
1497         }
1498         if (func)
1499                 tok_expect(')');
1500         if (tok_see() == '(') {
1501                 struct name args[MAXARGS] = {{""}};
1502                 int varg = 0;
1503                 int nargs = readargs(args, &varg);
1504                 int fdef = !func;
1505                 if (!func) {
1506                         ret = type;
1507                         type = &tpool[npool++];
1508                         func = type;
1509                 }
1510                 func->flags = T_FUNC;
1511                 func->bt = LONGSZ;
1512                 func->id = func_create(ret, args, nargs);
1513                 if (fdef && tok_see() == '{') {
1514                         funcdef(name, func, args, nargs, varg, flags);
1515                         return 1;
1516                 }
1517         }
1518         memcpy(main, type, sizeof(*type));
1519         return 0;
1520 }
1521
1522 static int readdefs(void (*def)(void *data, struct name *name, unsigned flags),
1523                         void *data)
1524 {
1525         struct type base;
1526         unsigned base_flags;
1527         if (basetype(&base, &base_flags))
1528                 return 1;
1529         while (tok_see() != ';' && tok_see() != '{') {
1530                 struct name name = {{""}};
1531                 unsigned flags = base_flags;
1532                 if (readname(&name.type, name.name, &base, flags))
1533                         break;
1534                 if (!tok_jmp('='))
1535                         flags |= F_INIT;
1536                 def(data, &name, flags);
1537                 tok_jmp(',');
1538         }
1539         return 0;
1540 }
1541
1542 static void typedefdef(void *data, struct name *name, unsigned flags)
1543 {
1544         typedef_add(name->name, &name->type);
1545 }
1546
1547 static void readstmt(void);
1548
1549 #define MAXCASES                (1 << 7)
1550
1551 static void readswitch(void)
1552 {
1553         int break_beg = nbreaks;
1554         long val_addr = o_mklocal(LONGSZ);
1555         long matched[MAXCASES];
1556         int nmatched = 0;
1557         struct type t;
1558         long next;
1559         int ref = 1;
1560         int i;
1561         tok_expect('(');
1562         readexpr();
1563         ts_pop_de(&t);
1564         o_local(val_addr);
1565         o_tmpswap();
1566         o_assign(TYPE_BT(&t));
1567         ts_de(0);
1568         o_tmpdrop(1);
1569         tok_expect(')');
1570         tok_expect('{');
1571         while (tok_jmp('}')) {
1572                 int n = 0;
1573                 while (tok_see() == TOK_CASE || tok_see() == TOK_DEFAULT) {
1574                         if (n++ > 0)
1575                                 matched[nmatched++] = o_jmp(0);
1576                         if (!ref++)
1577                                 o_filljmp(next);
1578                         if (!tok_jmp(TOK_CASE)) {
1579                                 caseexpr = 1;
1580                                 readexpr();
1581                                 ts_pop_de(NULL);
1582                                 caseexpr = 0;
1583                                 o_local(val_addr);
1584                                 o_deref(TYPE_BT(&t));
1585                                 o_bop(O_EQ);
1586                                 next = o_jz(0);
1587                                 ref = 0;
1588                                 tok_expect(':');
1589                                 o_tmpdrop(1);
1590                                 continue;
1591                         }
1592                         if (!tok_jmp(TOK_DEFAULT)) {
1593                                 tok_expect(':');
1594                                 continue;
1595                         }
1596                 }
1597                 for (i = 0; i < nmatched; i++)
1598                         o_filljmp(matched[i]);
1599                 nmatched = 0;
1600                 readstmt();
1601         }
1602         o_rmlocal(val_addr, LONGSZ);
1603         if (!ref++)
1604                 o_filljmp(next);
1605         break_fill(o_mklabel(), break_beg);
1606 }
1607
1608 #define MAXGOTO                 (1 << 10)
1609
1610 static struct gotoinfo {
1611         char name[NAMELEN];
1612         long addr;
1613 } gotos[MAXGOTO];
1614 static int ngotos;
1615
1616 static struct labelinfo {
1617         char name[NAMELEN];
1618         long addr;
1619 } labels[MAXGOTO];
1620 static int nlabels;
1621
1622 static void goto_add(char *name)
1623 {
1624         strcpy(gotos[ngotos].name, name);
1625         gotos[ngotos++].addr = o_jmp(0);
1626 }
1627
1628 static void label_add(char *name)
1629 {
1630         strcpy(labels[nlabels].name, name);
1631         labels[nlabels++].addr = o_mklabel();
1632 }
1633
1634 static void goto_fill(void)
1635 {
1636         int i, j;
1637         for (i = 0; i < ngotos; i++)
1638                 for (j = 0; j < nlabels; j++)
1639                         if (!strcmp(gotos[i].name, labels[j].name)) {
1640                                 o_filljmp2(gotos[i].addr, labels[j].addr);
1641                                 break;
1642                         }
1643 }
1644
1645 static void readstmt(void)
1646 {
1647         o_tmpdrop(-1);
1648         nts = 0;
1649         if (!tok_jmp('{')) {
1650                 int _nlocals = nlocals;
1651                 int _nglobals = nglobals;
1652                 int _nenums = nenums;
1653                 int _ntypedefs = ntypedefs;
1654                 int _nstructs = nstructs;
1655                 int _nfuncs = nfuncs;
1656                 int _narrays = narrays;
1657                 while (tok_jmp('}'))
1658                         readstmt();
1659                 nlocals = _nlocals;
1660                 nenums = _nenums;
1661                 ntypedefs = _ntypedefs;
1662                 nstructs = _nstructs;
1663                 nfuncs = _nfuncs;
1664                 narrays = _narrays;
1665                 nglobals = _nglobals;
1666                 return;
1667         }
1668         if (!readdefs(localdef, NULL)) {
1669                 tok_expect(';');
1670                 return;
1671         }
1672         if (!tok_jmp(TOK_TYPEDEF)) {
1673                 readdefs(typedefdef, NULL);
1674                 tok_expect(';');
1675                 return;
1676         }
1677         if (!tok_jmp(TOK_IF)) {
1678                 long l1, l2;
1679                 tok_expect('(');
1680                 readexpr();
1681                 tok_expect(')');
1682                 ts_pop_de(NULL);
1683                 l1 = o_jz(0);
1684                 readstmt();
1685                 if (!tok_jmp(TOK_ELSE)) {
1686                         l2 = o_jmp(0);
1687                         o_filljmp(l1);
1688                         readstmt();
1689                         o_filljmp(l2);
1690                 } else {
1691                         o_filljmp(l1);
1692                 }
1693                 return;
1694         }
1695         if (!tok_jmp(TOK_WHILE)) {
1696                 long l1, l2;
1697                 int break_beg = nbreaks;
1698                 int continue_beg = ncontinues;
1699                 l1 = o_mklabel();
1700                 tok_expect('(');
1701                 readexpr();
1702                 tok_expect(')');
1703                 ts_pop_de(NULL);
1704                 l2 = o_jz(0);
1705                 readstmt();
1706                 o_jmp(l1);
1707                 o_filljmp(l2);
1708                 break_fill(o_mklabel(), break_beg);
1709                 continue_fill(l1, continue_beg);
1710                 return;
1711         }
1712         if (!tok_jmp(TOK_DO)) {
1713                 long l1, l2;
1714                 int break_beg = nbreaks;
1715                 int continue_beg = ncontinues;
1716                 l1 = o_mklabel();
1717                 readstmt();
1718                 tok_expect(TOK_WHILE);
1719                 tok_expect('(');
1720                 l2 = o_mklabel();
1721                 readexpr();
1722                 ts_pop_de(NULL);
1723                 o_jnz(l1);
1724                 tok_expect(')');
1725                 break_fill(o_mklabel(), break_beg);
1726                 continue_fill(l2, continue_beg);
1727                 return;
1728         }
1729         if (!tok_jmp(TOK_FOR)) {
1730                 long l_check, l_jump, j_fail, j_pass;
1731                 int break_beg = nbreaks;
1732                 int continue_beg = ncontinues;
1733                 int has_cond = 0;
1734                 tok_expect('(');
1735                 if (tok_see() != ';')
1736                         readestmt();
1737                 tok_expect(';');
1738                 l_check = o_mklabel();
1739                 if (tok_see() != ';') {
1740                         readestmt();
1741                         ts_pop_de(NULL);
1742                         j_fail = o_jz(0);
1743                         has_cond = 1;
1744                 }
1745                 tok_expect(';');
1746                 j_pass = o_jmp(0);
1747                 l_jump = o_mklabel();
1748                 if (tok_see() != ')')
1749                         readestmt();
1750                 tok_expect(')');
1751                 o_jmp(l_check);
1752                 o_filljmp(j_pass);
1753                 readstmt();
1754                 o_jmp(l_jump);
1755                 if (has_cond)
1756                         o_filljmp(j_fail);
1757                 break_fill(o_mklabel(), break_beg);
1758                 continue_fill(l_jump, continue_beg);
1759                 return;
1760         }
1761         if (!tok_jmp(TOK_SWITCH)) {
1762                 readswitch();
1763                 return;
1764         }
1765         if (!tok_jmp(TOK_RETURN)) {
1766                 int ret = tok_see() != ';';
1767                 if (ret) {
1768                         readexpr();
1769                         ts_pop_de(NULL);
1770                 }
1771                 tok_expect(';');
1772                 o_ret(ret);
1773                 return;
1774         }
1775         if (!tok_jmp(TOK_BREAK)) {
1776                 tok_expect(';');
1777                 breaks[nbreaks++] = o_jmp(0);
1778                 return;
1779         }
1780         if (!tok_jmp(TOK_CONTINUE)) {
1781                 tok_expect(';');
1782                 continues[ncontinues++] = o_jmp(0);
1783                 return;
1784         }
1785         if (!tok_jmp(TOK_GOTO)) {
1786                 tok_expect(TOK_NAME);
1787                 goto_add(tok_id());
1788                 tok_expect(';');
1789                 return;
1790         }
1791         readestmt();
1792         /* labels */
1793         if (!tok_jmp(':')) {
1794                 label_add(tok_id());
1795                 return;
1796         }
1797         tok_expect(';');
1798 }
1799
1800 static void readdecl(void)
1801 {
1802         if (!tok_jmp(TOK_TYPEDEF)) {
1803                 readdefs(typedefdef, NULL);
1804                 tok_expect(';');
1805                 return;
1806         }
1807         readdefs(globaldef, NULL);
1808         if (tok_see() == '{') {
1809                 readstmt();
1810                 goto_fill();
1811                 o_func_end();
1812                 func_name[0] = '\0';
1813                 nlocals = 0;
1814                 ngotos = 0;
1815                 nlabels = 0;
1816                 return;
1817         }
1818         tok_expect(';');
1819 }
1820
1821 static void parse(void)
1822 {
1823         while (tok_see() != TOK_EOF)
1824                 readdecl();
1825 }
1826
1827 static void compat_macros(void)
1828 {
1829         cpp_define("__STDC__", "");
1830         cpp_define("__arm__", "");
1831         cpp_define("__linux__", "");
1832
1833         /* ignored keywords */
1834         cpp_define("const", "");
1835         cpp_define("register", "");
1836         cpp_define("volatile", "");
1837         cpp_define("inline", "");
1838         cpp_define("restrict", "");
1839         cpp_define("__inline__", "");
1840         cpp_define("__restrict__", "");
1841         cpp_define("__attribute__(x)", "");
1842         cpp_define("__builtin_va_list__", "long");
1843 }
1844
1845 int main(int argc, char *argv[])
1846 {
1847         char obj[128];
1848         int ofd;
1849         int i = 1;
1850         compat_macros();
1851         while (i < argc && argv[i][0] == '-') {
1852                 if (argv[i][1] == 'I')
1853                         cpp_addpath(argv[i][2] ? argv[i] + 2 : argv[++i]);
1854                 if (argv[i][1] == 'D') {
1855                         char *name = argv[i] + 2;
1856                         char *def = "";
1857                         char *eq = strchr(name, '=');
1858                         if (eq) {
1859                                 *eq = '\0';
1860                                 def = eq + 1;
1861                         }
1862                         cpp_define(name, def);
1863                 }
1864                 if (argv[i][1] == 'o')
1865                         strcpy(obj, argv[i][2] ? argv[i] + 2 : argv[++i]);
1866                 i++;
1867         }
1868         if (i == argc)
1869                 die("neatcc: no file given\n");
1870         if (cpp_init(argv[i]))
1871                 die("neatcc: cannot open input file\n");
1872         parse();
1873         if (!*obj) {
1874                 strcpy(obj, argv[i]);
1875                 obj[strlen(obj) - 1] = 'o';
1876         }
1877         ofd = open(obj, O_WRONLY | O_TRUNC | O_CREAT, 0600);
1878         o_write(ofd);
1879         close(ofd);
1880         return 0;
1881 }