libtcc.c

   1 /*
   2  *  TCC - Tiny C Compiler
   3  *
   4  *  Copyright (c) 2001-2004 Fabrice Bellard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include "tcc.h"
  22
  23 /********************************************************/
  24 /* global variables */
  25
  26 /* use GNU C extensions */
  27 ST_DATA int gnu_ext = 1;
  28
  29 /* use TinyCC extensions */
  30 ST_DATA int tcc_ext = 1;
  31
  32 /* XXX: get rid of this ASAP */
  33 ST_DATA struct TCCState *tcc_state;
  34
  35 /********************************************************/
  36
  37 #ifdef ONE_SOURCE
  38 #include "tccpp.c"
  39 #include "tccgen.c"
  40 #include "tccelf.c"
  41 #include "tccrun.c"
  42 #ifdef TCC_TARGET_I386
  43 #include "i386-gen.c"
  44 #endif
  45 #ifdef TCC_TARGET_ARM
  46 #include "arm-gen.c"
  47 #endif
  48 #ifdef TCC_TARGET_C67
  49 #include "c67-gen.c"
  50 #endif
  51 #ifdef TCC_TARGET_X86_64
  52 #include "x86_64-gen.c"
  53 #endif
  54 #ifdef CONFIG_TCC_ASM
  55 #include "tccasm.c"
  56 #if defined TCC_TARGET_I386 || defined TCC_TARGET_X86_64
  57 #include "i386-asm.c"
  58 #endif
  59 #endif
  60 #ifdef TCC_TARGET_COFF
  61 #include "tcccoff.c"
  62 #endif
  63 #ifdef TCC_TARGET_PE
  64 #include "tccpe.c"
  65 #endif
  66 #endif /* ONE_SOURCE */
  67
  68 /********************************************************/
  69 #ifndef CONFIG_TCC_ASM
  70 ST_FUNC void asm_instr(void)
  71 {
  72     tcc_error("inline asm() not supported");
  73 }
  74 ST_FUNC void asm_global_instr(void)
  75 {
  76     tcc_error("inline asm() not supported");
  77 }
  78 #endif
  79
  80 /********************************************************/
  81
  82 #ifdef _WIN32
  83 // GCC appears to use '/' for relative paths and '\\' for absolute paths on Windows
  84 static char *normalize_slashes(char *path)
  85 {
  86     char *p;
  87     if (path[1] == ':') {
  88         for (p = path+2; *p; ++p)
  89             if (*p == '/')
  90                 *p = '\\';
  91     } else {
  92         for (p = path; *p; ++p)
  93             if (*p == '\\')
  94                 *p = '/';
  95     }
  96     return path;
  97 }
  98
  99 static HMODULE tcc_module;
 100
 101 /* on win32, we suppose the lib and includes are at the location of 'tcc.exe' */
 102 static void tcc_set_lib_path_w32(TCCState *s)
 103 {
 104     char path[1024], *p;
 105     GetModuleFileNameA(tcc_module, path, sizeof path);
 106     p = tcc_basename(normalize_slashes(strlwr(path)));
 107     if (p - 5 > path && 0 == strncmp(p - 5, "/bin/", 5))
 108         p -= 5;
 109     else if (p > path)
 110         p--;
 111     *p = 0;
 112     tcc_set_lib_path(s, path);
 113 }
 114
 115 #ifdef TCC_TARGET_PE
 116 static void tcc_add_systemdir(TCCState *s)
 117 {
 118     char buf[1000];
 119     GetSystemDirectory(buf, sizeof buf);
 120     tcc_add_library_path(s, normalize_slashes(buf));
 121 }
 122 #endif
 123
 124 #ifndef CONFIG_TCC_STATIC
 125 void dlclose(void *p)
 126 {
 127     FreeLibrary((HMODULE)p);
 128 }
 129 #endif
 130
 131 #ifdef LIBTCC_AS_DLL
 132 BOOL WINAPI DllMain (HANDLE hDll, DWORD dwReason, LPVOID lpReserved)
 133 {
 134     if (DLL_PROCESS_ATTACH == dwReason)
 135         tcc_module = hDll;
 136     return TRUE;
 137 }
 138 #endif
 139 #endif
 140
 141 /********************************************************/
 142 /* copy a string and truncate it. */
 143 PUB_FUNC char *pstrcpy(char *buf, int buf_size, const char *s)
 144 {
 145     char *q, *q_end;
 146     int c;
 147
 148     if (buf_size > 0) {
 149         q = buf;
 150         q_end = buf + buf_size - 1;
 151         while (q < q_end) {
 152             c = *s++;
 153             if (c == '\0')
 154                 break;
 155             *q++ = c;
 156         }
 157         *q = '\0';
 158     }
 159     return buf;
 160 }
 161
 162 /* strcat and truncate. */
 163 PUB_FUNC char *pstrcat(char *buf, int buf_size, const char *s)
 164 {
 165     int len;
 166     len = strlen(buf);
 167     if (len < buf_size)
 168         pstrcpy(buf + len, buf_size - len, s);
 169     return buf;
 170 }
 171
 172 PUB_FUNC char *pstrncpy(char *out, const char *in, size_t num)
 173 {
 174     memcpy(out, in, num);
 175     out[num] = '\0';
 176     return out;
 177 }
 178
 179 /* extract the basename of a file */
 180 PUB_FUNC char *tcc_basename(const char *name)
 181 {
 182     char *p = strchr(name, 0);
 183     while (p > name && !IS_DIRSEP(p[-1]))
 184         --p;
 185     return p;
 186 }
 187
 188 /* extract extension part of a file
 189  *
 190  * (if no extension, return pointer to end-of-string)
 191  */
 192 PUB_FUNC char *tcc_fileextension (const char *name)
 193 {
 194     char *b = tcc_basename(name);
 195     char *e = strrchr(b, '.');
 196     return e ? e : strchr(b, 0);
 197 }
 198
 199 /********************************************************/
 200 /* memory management */
 201
 202 #undef free
 203 #undef malloc
 204 #undef realloc
 205
 206 #ifdef MEM_DEBUG
 207 ST_DATA int mem_cur_size;
 208 ST_DATA int mem_max_size;
 209 unsigned malloc_usable_size(void*);
 210 #endif
 211
 212 PUB_FUNC void tcc_free(void *ptr)
 213 {
 214 #ifdef MEM_DEBUG
 215     mem_cur_size -= malloc_usable_size(ptr);
 216 #endif
 217     free(ptr);
 218 }
 219
 220 PUB_FUNC void *tcc_malloc(unsigned long size)
 221 {
 222     void *ptr;
 223     ptr = malloc(size);
 224     if (!ptr && size)
 225         tcc_error("memory full");
 226 #ifdef MEM_DEBUG
 227     mem_cur_size += malloc_usable_size(ptr);
 228     if (mem_cur_size > mem_max_size)
 229         mem_max_size = mem_cur_size;
 230 #endif
 231     return ptr;
 232 }
 233
 234 PUB_FUNC void *tcc_mallocz(unsigned long size)
 235 {
 236     void *ptr;
 237     ptr = tcc_malloc(size);
 238     memset(ptr, 0, size);
 239     return ptr;
 240 }
 241
 242 PUB_FUNC void *tcc_realloc(void *ptr, unsigned long size)
 243 {
 244     void *ptr1;
 245 #ifdef MEM_DEBUG
 246     mem_cur_size -= malloc_usable_size(ptr);
 247 #endif
 248     ptr1 = realloc(ptr, size);
 249     if (!ptr1 && size)
 250         tcc_error("memory full");
 251 #ifdef MEM_DEBUG
 252     /* NOTE: count not correct if alloc error, but not critical */
 253     mem_cur_size += malloc_usable_size(ptr1);
 254     if (mem_cur_size > mem_max_size)
 255         mem_max_size = mem_cur_size;
 256 #endif
 257     return ptr1;
 258 }
 259
 260 PUB_FUNC char *tcc_strdup(const char *str)
 261 {
 262     char *ptr;
 263     ptr = tcc_malloc(strlen(str) + 1);
 264     strcpy(ptr, str);
 265     return ptr;
 266 }
 267
 268 PUB_FUNC void tcc_memstats(void)
 269 {
 270 #ifdef MEM_DEBUG
 271     printf("memory: %d bytes, max = %d bytes\n", mem_cur_size, mem_max_size);
 272 #endif
 273 }
 274
 275 #define free(p) use_tcc_free(p)
 276 #define malloc(s) use_tcc_malloc(s)
 277 #define realloc(p, s) use_tcc_realloc(p, s)
 278
 279 /********************************************************/
 280 /* dynarrays */
 281
 282 ST_FUNC void dynarray_add(void ***ptab, int *nb_ptr, void *data)
 283 {
 284     int nb, nb_alloc;
 285     void **pp;
 286
 287     nb = *nb_ptr;
 288     pp = *ptab;
 289     /* every power of two we double array size */
 290     if ((nb & (nb - 1)) == 0) {
 291         if (!nb)
 292             nb_alloc = 1;
 293         else
 294             nb_alloc = nb * 2;
 295         pp = tcc_realloc(pp, nb_alloc * sizeof(void *));
 296         *ptab = pp;
 297     }
 298     pp[nb++] = data;
 299     *nb_ptr = nb;
 300 }
 301
 302 ST_FUNC void dynarray_reset(void *pp, int *n)
 303 {
 304     void **p;
 305     for (p = *(void***)pp; *n; ++p, --*n)
 306         if (*p)
 307             tcc_free(*p);
 308     tcc_free(*(void**)pp);
 309     *(void**)pp = NULL;
 310 }
 311
 312 static void tcc_split_path(TCCState *s, void ***p_ary, int *p_nb_ary, const char *in)
 313 {
 314     const char *p;
 315     do {
 316         int c;
 317         CString str;
 318
 319         cstr_new(&str);
 320         for (p = in; c = *p, c != '\0' && c != PATHSEP; ++p) {
 321             if (c == '{' && p[1] && p[2] == '}') {
 322                 c = p[1], p += 2;
 323                 if (c == 'B')
 324                     cstr_cat(&str, s->tcc_lib_path);
 325             } else {
 326                 cstr_ccat(&str, c);
 327             }
 328         }
 329         cstr_ccat(&str, '\0');
 330         dynarray_add(p_ary, p_nb_ary, str.data);
 331         in = p+1;
 332     } while (*p);
 333 }
 334
 335 /********************************************************/
 336
 337 ST_FUNC Section *new_section(TCCState *s1, const char *name, int sh_type, int sh_flags)
 338 {
 339     Section *sec;
 340
 341     sec = tcc_mallocz(sizeof(Section) + strlen(name));
 342     strcpy(sec->name, name);
 343     sec->sh_type = sh_type;
 344     sec->sh_flags = sh_flags;
 345     switch(sh_type) {
 346     case SHT_HASH:
 347     case SHT_REL:
 348     case SHT_RELA:
 349     case SHT_DYNSYM:
 350     case SHT_SYMTAB:
 351     case SHT_DYNAMIC:
 352         sec->sh_addralign = 4;
 353         break;
 354     case SHT_STRTAB:
 355         sec->sh_addralign = 1;
 356         break;
 357     default:
 358         sec->sh_addralign = 32; /* default conservative alignment */
 359         break;
 360     }
 361
 362     if (sh_flags & SHF_PRIVATE) {
 363         dynarray_add((void ***)&s1->priv_sections, &s1->nb_priv_sections, sec);
 364     } else {
 365         sec->sh_num = s1->nb_sections;
 366         dynarray_add((void ***)&s1->sections, &s1->nb_sections, sec);
 367     }
 368
 369     return sec;
 370 }
 371
 372 static void free_section(Section *s)
 373 {
 374     tcc_free(s->data);
 375 }
 376
 377 /* realloc section and set its content to zero */
 378 ST_FUNC void section_realloc(Section *sec, unsigned long new_size)
 379 {
 380     unsigned long size;
 381     unsigned char *data;
 382
 383     size = sec->data_allocated;
 384     if (size == 0)
 385         size = 1;
 386     while (size < new_size)
 387         size = size * 2;
 388     data = tcc_realloc(sec->data, size);
 389     memset(data + sec->data_allocated, 0, size - sec->data_allocated);
 390     sec->data = data;
 391     sec->data_allocated = size;
 392 }
 393
 394 /* reserve at least 'size' bytes in section 'sec' from
 395    sec->data_offset. */
 396 ST_FUNC void *section_ptr_add(Section *sec, unsigned long size)
 397 {
 398     unsigned long offset, offset1;
 399
 400     offset = sec->data_offset;
 401     offset1 = offset + size;
 402     if (offset1 > sec->data_allocated)
 403         section_realloc(sec, offset1);
 404     sec->data_offset = offset1;
 405     return sec->data + offset;
 406 }
 407
 408 /* reserve at least 'size' bytes from section start */
 409 ST_FUNC void section_reserve(Section *sec, unsigned long size)
 410 {
 411     if (size > sec->data_allocated)
 412         section_realloc(sec, size);
 413     if (size > sec->data_offset)
 414         sec->data_offset = size;
 415 }
 416
 417 /* return a reference to a section, and create it if it does not
 418    exists */
 419 ST_FUNC Section *find_section(TCCState *s1, const char *name)
 420 {
 421     Section *sec;
 422     int i;
 423     for(i = 1; i < s1->nb_sections; i++) {
 424         sec = s1->sections[i];
 425         if (!strcmp(name, sec->name))
 426             return sec;
 427     }
 428     /* sections are created as PROGBITS */
 429     return new_section(s1, name, SHT_PROGBITS, SHF_ALLOC);
 430 }
 431
 432 /* update sym->c so that it points to an external symbol in section
 433    'section' with value 'value' */
 434 ST_FUNC void put_extern_sym2(Sym *sym, Section *section,
 435                             addr_t value, unsigned long size,
 436                             int can_add_underscore)
 437 {
 438     int sym_type, sym_bind, sh_num, info, other;
 439     ElfW(Sym) *esym;
 440     const char *name;
 441     char buf1[256];
 442
 443     if (section == NULL)
 444         sh_num = SHN_UNDEF;
 445     else if (section == SECTION_ABS)
 446         sh_num = SHN_ABS;
 447     else
 448         sh_num = section->sh_num;
 449
 450     if ((sym->type.t & VT_BTYPE) == VT_FUNC) {
 451         sym_type = STT_FUNC;
 452     } else if ((sym->type.t & VT_BTYPE) == VT_VOID) {
 453         sym_type = STT_NOTYPE;
 454     } else {
 455         sym_type = STT_OBJECT;
 456     }
 457
 458     if (sym->type.t & VT_STATIC)
 459         sym_bind = STB_LOCAL;
 460     else {
 461         if (sym->type.t & VT_WEAK)
 462             sym_bind = STB_WEAK;
 463         else
 464             sym_bind = STB_GLOBAL;
 465     }
 466
 467     if (!sym->c) {
 468         name = get_tok_str(sym->v, NULL);
 469 #ifdef CONFIG_TCC_BCHECK
 470         if (tcc_state->do_bounds_check) {
 471             char buf[32];
 472
 473             /* XXX: avoid doing that for statics ? */
 474             /* if bound checking is activated, we change some function
 475                names by adding the "__bound" prefix */
 476             switch(sym->v) {
 477 #ifdef TCC_TARGET_PE
 478             /* XXX: we rely only on malloc hooks */
 479             case TOK_malloc:
 480             case TOK_free:
 481             case TOK_realloc:
 482             case TOK_memalign:
 483             case TOK_calloc:
 484 #endif
 485             case TOK_memcpy:
 486             case TOK_memmove:
 487             case TOK_memset:
 488             case TOK_strlen:
 489             case TOK_strcpy:
 490             case TOK_alloca:
 491                 strcpy(buf, "__bound_");
 492                 strcat(buf, name);
 493                 name = buf;
 494                 break;
 495             }
 496         }
 497 #endif
 498         other = 0;
 499
 500 #ifdef TCC_TARGET_PE
 501         if (sym->type.t & VT_EXPORT)
 502             other |= 1;
 503         if (sym_type == STT_FUNC && sym->type.ref) {
 504             int attr = sym->type.ref->r;
 505             if (FUNC_EXPORT(attr))
 506                 other |= 1;
 507             if (FUNC_CALL(attr) == FUNC_STDCALL && can_add_underscore) {
 508                 sprintf(buf1, "_%s@%d", name, FUNC_ARGS(attr) * PTR_SIZE);
 509                 name = buf1;
 510                 other |= 2;
 511                 can_add_underscore = 0;
 512             }
 513         } else {
 514             if (find_elf_sym(tcc_state->dynsymtab_section, name))
 515                 other |= 4;
 516             if (sym->type.t & VT_IMPORT)
 517                 other |= 4;
 518         }
 519 #endif
 520         if (tcc_state->leading_underscore && can_add_underscore) {
 521             buf1[0] = '_';
 522             pstrcpy(buf1 + 1, sizeof(buf1) - 1, name);
 523             name = buf1;
 524         }
 525         if (sym->asm_label) {
 526             name = sym->asm_label;
 527         }
 528         info = ELFW(ST_INFO)(sym_bind, sym_type);
 529         sym->c = add_elf_sym(symtab_section, value, size, info, other, sh_num, name);
 530     } else {
 531         esym = &((ElfW(Sym) *)symtab_section->data)[sym->c];
 532         esym->st_value = value;
 533         esym->st_size = size;
 534         esym->st_shndx = sh_num;
 535     }
 536 }
 537
 538 ST_FUNC void put_extern_sym(Sym *sym, Section *section,
 539                            addr_t value, unsigned long size)
 540 {
 541     put_extern_sym2(sym, section, value, size, 1);
 542 }
 543
 544 /* add a new relocation entry to symbol 'sym' in section 's' */
 545 ST_FUNC void greloc(Section *s, Sym *sym, unsigned long offset, int type)
 546 {
 547     int c = 0;
 548     if (sym) {
 549         if (0 == sym->c)
 550             put_extern_sym(sym, NULL, 0, 0);
 551         c = sym->c;
 552     }
 553     /* now we can add ELF relocation info */
 554     put_elf_reloc(symtab_section, s, offset, type, c);
 555 }
 556
 557 /********************************************************/
 558
 559 static void strcat_vprintf(char *buf, int buf_size, const char *fmt, va_list ap)
 560 {
 561     int len;
 562     len = strlen(buf);
 563     vsnprintf(buf + len, buf_size - len, fmt, ap);
 564 }
 565
 566 static void strcat_printf(char *buf, int buf_size, const char *fmt, ...)
 567 {
 568     va_list ap;
 569     va_start(ap, fmt);
 570     strcat_vprintf(buf, buf_size, fmt, ap);
 571     va_end(ap);
 572 }
 573
 574 static void error1(TCCState *s1, int is_warning, const char *fmt, va_list ap)
 575 {
 576     char buf[2048];
 577     BufferedFile **pf, *f;
 578
 579     buf[0] = '\0';
 580     /* use upper file if inline ":asm:" or token ":paste:" */
 581     for (f = file; f && f->filename[0] == ':'; f = f->prev)
 582      ;
 583     if (f) {
 584         for(pf = s1->include_stack; pf < s1->include_stack_ptr; pf++)
 585             strcat_printf(buf, sizeof(buf), "In file included from %s:%d:\n",
 586                 (*pf)->filename, (*pf)->line_num);
 587         if (f->line_num > 0) {
 588             strcat_printf(buf, sizeof(buf), "%s:%d: ",
 589                 f->filename, f->line_num);
 590         } else {
 591             strcat_printf(buf, sizeof(buf), "%s: ",
 592                 f->filename);
 593         }
 594     } else {
 595         strcat_printf(buf, sizeof(buf), "tcc: ");
 596     }
 597     if (is_warning)
 598         strcat_printf(buf, sizeof(buf), "warning: ");
 599     else
 600         strcat_printf(buf, sizeof(buf), "error: ");
 601     strcat_vprintf(buf, sizeof(buf), fmt, ap);
 602
 603     if (!s1->error_func) {
 604         /* default case: stderr */
 605         fprintf(stderr, "%s\n", buf);
 606     } else {
 607         s1->error_func(s1->error_opaque, buf);
 608     }
 609     if (!is_warning || s1->warn_error)
 610         s1->nb_errors++;
 611 }
 612
 613 LIBTCCAPI void tcc_set_error_func(TCCState *s, void *error_opaque,
 614                         void (*error_func)(void *opaque, const char *msg))
 615 {
 616     s->error_opaque = error_opaque;
 617     s->error_func = error_func;
 618 }
 619
 620 /* error without aborting current compilation */
 621 PUB_FUNC void tcc_error_noabort(const char *fmt, ...)
 622 {
 623     TCCState *s1 = tcc_state;
 624     va_list ap;
 625
 626     va_start(ap, fmt);
 627     error1(s1, 0, fmt, ap);
 628     va_end(ap);
 629 }
 630
 631 PUB_FUNC void tcc_error(const char *fmt, ...)
 632 {
 633     TCCState *s1 = tcc_state;
 634     va_list ap;
 635
 636     va_start(ap, fmt);
 637     error1(s1, 0, fmt, ap);
 638     va_end(ap);
 639     /* better than nothing: in some cases, we accept to handle errors */
 640     if (s1->error_set_jmp_enabled) {
 641         longjmp(s1->error_jmp_buf, 1);
 642     } else {
 643         /* XXX: eliminate this someday */
 644         exit(1);
 645     }
 646 }
 647
 648 PUB_FUNC void tcc_warning(const char *fmt, ...)
 649 {
 650     TCCState *s1 = tcc_state;
 651     va_list ap;
 652
 653     if (s1->warn_none)
 654         return;
 655
 656     va_start(ap, fmt);
 657     error1(s1, 1, fmt, ap);
 658     va_end(ap);
 659 }
 660
 661 /********************************************************/
 662 /* I/O layer */
 663
 664 ST_FUNC void tcc_open_bf(TCCState *s1, const char *filename, int initlen)
 665 {
 666     BufferedFile *bf;
 667     int buflen = initlen ? initlen : IO_BUF_SIZE;
 668
 669     bf = tcc_malloc(sizeof(BufferedFile) + buflen);
 670     bf->buf_ptr = bf->buffer;
 671     bf->buf_end = bf->buffer + initlen;
 672     bf->buf_end[0] = CH_EOB; /* put eob symbol */
 673     pstrcpy(bf->filename, sizeof(bf->filename), filename);
 674 #ifdef _WIN32
 675     normalize_slashes(bf->filename);
 676 #endif
 677     bf->line_num = 1;
 678     bf->ifndef_macro = 0;
 679     bf->ifdef_stack_ptr = s1->ifdef_stack_ptr;
 680     bf->fd = -1;
 681     bf->prev = file;
 682     file = bf;
 683 }
 684
 685 ST_FUNC void tcc_close(void)
 686 {
 687     BufferedFile *bf = file;
 688     if (bf->fd > 0) {
 689         close(bf->fd);
 690         total_lines += bf->line_num;
 691     }
 692     file = bf->prev;
 693     tcc_free(bf);
 694 }
 695
 696 ST_FUNC int tcc_open(TCCState *s1, const char *filename)
 697 {
 698     int fd;
 699     if (strcmp(filename, "-") == 0)
 700         fd = 0, filename = "stdin";
 701     else
 702         fd = open(filename, O_RDONLY | O_BINARY);
 703     if ((s1->verbose == 2 && fd >= 0) || s1->verbose == 3)
 704         printf("%s %*s%s\n", fd < 0 ? "nf":"->",
 705                (int)(s1->include_stack_ptr - s1->include_stack), "", filename);
 706     if (fd < 0)
 707         return -1;
 708
 709     tcc_open_bf(s1, filename, 0);
 710     file->fd = fd;
 711     return fd;
 712 }
 713
 714 /* compile the C file opened in 'file'. Return non zero if errors. */
 715 static int tcc_compile(TCCState *s1)
 716 {
 717     Sym *define_start;
 718     SValue *pvtop;
 719     char buf[512];
 720     volatile int section_sym;
 721
 722 #ifdef INC_DEBUG
 723     printf("%s: **** new file\n", file->filename);
 724 #endif
 725     preprocess_init(s1);
 726
 727     cur_text_section = NULL;
 728     funcname = "";
 729     anon_sym = SYM_FIRST_ANOM;
 730
 731     /* file info: full path + filename */
 732     section_sym = 0; /* avoid warning */
 733     if (s1->do_debug) {
 734         section_sym = put_elf_sym(symtab_section, 0, 0,
 735                                   ELFW(ST_INFO)(STB_LOCAL, STT_SECTION), 0,
 736                                   text_section->sh_num, NULL);
 737         getcwd(buf, sizeof(buf));
 738 #ifdef _WIN32
 739         normalize_slashes(buf);
 740 #endif
 741         pstrcat(buf, sizeof(buf), "/");
 742         put_stabs_r(buf, N_SO, 0, 0,
 743                     text_section->data_offset, text_section, section_sym);
 744         put_stabs_r(file->filename, N_SO, 0, 0,
 745                     text_section->data_offset, text_section, section_sym);
 746     }
 747     /* an elf symbol of type STT_FILE must be put so that STB_LOCAL
 748        symbols can be safely used */
 749     put_elf_sym(symtab_section, 0, 0,
 750                 ELFW(ST_INFO)(STB_LOCAL, STT_FILE), 0,
 751                 SHN_ABS, file->filename);
 752
 753     /* define some often used types */
 754     int_type.t = VT_INT;
 755
 756     char_pointer_type.t = VT_BYTE;
 757     mk_pointer(&char_pointer_type);
 758
 759 #if PTR_SIZE == 4
 760     size_type.t = VT_INT;
 761 #else
 762     size_type.t = VT_LLONG;
 763 #endif
 764
 765     func_old_type.t = VT_FUNC;
 766     func_old_type.ref = sym_push(SYM_FIELD, &int_type, FUNC_CDECL, FUNC_OLD);
 767 #ifdef TCC_TARGET_ARM
 768     arm_init_types();
 769 #endif
 770
 771 #if 0
 772     /* define 'void *alloca(unsigned int)' builtin function */
 773     {
 774         Sym *s1;
 775
 776         p = anon_sym++;
 777         sym = sym_push(p, mk_pointer(VT_VOID), FUNC_CDECL, FUNC_NEW);
 778         s1 = sym_push(SYM_FIELD, VT_UNSIGNED | VT_INT, 0, 0);
 779         s1->next = NULL;
 780         sym->next = s1;
 781         sym_push(TOK_alloca, VT_FUNC | (p << VT_STRUCT_SHIFT), VT_CONST, 0);
 782     }
 783 #endif
 784
 785     define_start = define_stack;
 786     nocode_wanted = 1;
 787
 788     if (setjmp(s1->error_jmp_buf) == 0) {
 789         s1->nb_errors = 0;
 790         s1->error_set_jmp_enabled = 1;
 791
 792         ch = file->buf_ptr[0];
 793         tok_flags = TOK_FLAG_BOL | TOK_FLAG_BOF;
 794         parse_flags = PARSE_FLAG_PREPROCESS | PARSE_FLAG_TOK_NUM;
 795         pvtop = vtop;
 796         next();
 797         decl(VT_CONST);
 798         if (tok != TOK_EOF)
 799             expect("declaration");
 800         if (pvtop != vtop)
 801             tcc_warning("internal compiler error: vstack leak? (%d)", vtop - pvtop);
 802
 803         /* end of translation unit info */
 804         if (s1->do_debug) {
 805             put_stabs_r(NULL, N_SO, 0, 0,
 806                         text_section->data_offset, text_section, section_sym);
 807         }
 808     }
 809
 810     s1->error_set_jmp_enabled = 0;
 811
 812     /* reset define stack, but leave -Dsymbols (may be incorrect if
 813        they are undefined) */
 814     free_defines(define_start);
 815
 816     gen_inline_functions();
 817
 818     sym_pop(&global_stack, NULL);
 819     sym_pop(&local_stack, NULL);
 820
 821     return s1->nb_errors != 0 ? -1 : 0;
 822 }
 823
 824 LIBTCCAPI int tcc_compile_string(TCCState *s, const char *str)
 825 {
 826     int len, ret;
 827     len = strlen(str);
 828
 829     tcc_open_bf(s, "<string>", len);
 830     memcpy(file->buffer, str, len);
 831     ret = tcc_compile(s);
 832     tcc_close();
 833     return ret;
 834 }
 835
 836 /* define a preprocessor symbol. A value can also be provided with the '=' operator */
 837 LIBTCCAPI void tcc_define_symbol(TCCState *s1, const char *sym, const char *value)
 838 {
 839     int len1, len2;
 840     /* default value */
 841     if (!value)
 842         value = "1";
 843     len1 = strlen(sym);
 844     len2 = strlen(value);
 845
 846     /* init file structure */
 847     tcc_open_bf(s1, "<define>", len1 + len2 + 1);
 848     memcpy(file->buffer, sym, len1);
 849     file->buffer[len1] = ' ';
 850     memcpy(file->buffer + len1 + 1, value, len2);
 851
 852     /* parse with define parser */
 853     ch = file->buf_ptr[0];
 854     next_nomacro();
 855     parse_define();
 856
 857     tcc_close();
 858 }
 859
 860 /* undefine a preprocessor symbol */
 861 LIBTCCAPI void tcc_undefine_symbol(TCCState *s1, const char *sym)
 862 {
 863     TokenSym *ts;
 864     Sym *s;
 865     ts = tok_alloc(sym, strlen(sym));
 866     s = define_find(ts->tok);
 867     /* undefine symbol by putting an invalid name */
 868     if (s)
 869         define_undef(s);
 870 }
 871
 872 /* cleanup all static data used during compilation */
 873 static void tcc_cleanup(void)
 874 {
 875     int i, n;
 876     if (NULL == tcc_state)
 877         return;
 878     tcc_state = NULL;
 879
 880     /* free -D defines */
 881     free_defines(NULL);
 882
 883     /* free tokens */
 884     n = tok_ident - TOK_IDENT;
 885     for(i = 0; i < n; i++)
 886         tcc_free(table_ident[i]);
 887     tcc_free(table_ident);
 888
 889     /* free sym_pools */
 890     dynarray_reset(&sym_pools, &nb_sym_pools);
 891     /* string buffer */
 892     cstr_free(&tokcstr);
 893     /* reset symbol stack */
 894     sym_free_first = NULL;
 895     /* cleanup from error/setjmp */
 896     macro_ptr = NULL;
 897 }
 898
 899 LIBTCCAPI TCCState *tcc_new(void)
 900 {
 901     TCCState *s;
 902     char buffer[100];
 903     int a,b,c;
 904
 905     tcc_cleanup();
 906
 907     s = tcc_mallocz(sizeof(TCCState));
 908     if (!s)
 909         return NULL;
 910     tcc_state = s;
 911 #ifdef _WIN32
 912     tcc_set_lib_path_w32(s);
 913 #else
 914     tcc_set_lib_path(s, CONFIG_TCCDIR);
 915 #endif
 916     s->output_type = TCC_OUTPUT_MEMORY;
 917     preprocess_new();
 918     s->include_stack_ptr = s->include_stack;
 919
 920     /* we add dummy defines for some special macros to speed up tests
 921        and to have working defined() */
 922     define_push(TOK___LINE__, MACRO_OBJ, NULL, NULL);
 923     define_push(TOK___FILE__, MACRO_OBJ, NULL, NULL);
 924     define_push(TOK___DATE__, MACRO_OBJ, NULL, NULL);
 925     define_push(TOK___TIME__, MACRO_OBJ, NULL, NULL);
 926
 927     /* define __TINYC__ 92X  */
 928     sscanf(TCC_VERSION, "%d.%d.%d", &a, &b, &c);
 929     sprintf(buffer, "%d", a*10000 + b*100 + c);
 930     tcc_define_symbol(s, "__TINYC__", buffer);
 931
 932     /* standard defines */
 933     tcc_define_symbol(s, "__STDC__", NULL);
 934     tcc_define_symbol(s, "__STDC_VERSION__", "199901L");
 935     tcc_define_symbol(s, "__STDC_HOSTED__", NULL);
 936
 937     /* target defines */
 938 #if defined(TCC_TARGET_I386)
 939     tcc_define_symbol(s, "__i386__", NULL);
 940     tcc_define_symbol(s, "__i386", NULL);
 941     tcc_define_symbol(s, "i386", NULL);
 942 #elif defined(TCC_TARGET_X86_64)
 943     tcc_define_symbol(s, "__x86_64__", NULL);
 944 #elif defined(TCC_TARGET_ARM)
 945     tcc_define_symbol(s, "__ARM_ARCH_4__", NULL);
 946     tcc_define_symbol(s, "__arm_elf__", NULL);
 947     tcc_define_symbol(s, "__arm_elf", NULL);
 948     tcc_define_symbol(s, "arm_elf", NULL);
 949     tcc_define_symbol(s, "__arm__", NULL);
 950     tcc_define_symbol(s, "__arm", NULL);
 951     tcc_define_symbol(s, "arm", NULL);
 952     tcc_define_symbol(s, "__APCS_32__", NULL);
 953 #endif
 954
 955 #ifdef TCC_TARGET_PE
 956     tcc_define_symbol(s, "_WIN32", NULL);
 957 # ifdef TCC_TARGET_X86_64
 958     tcc_define_symbol(s, "_WIN64", NULL);
 959 # endif
 960 #else
 961     tcc_define_symbol(s, "__unix__", NULL);
 962     tcc_define_symbol(s, "__unix", NULL);
 963     tcc_define_symbol(s, "unix", NULL);
 964 # if defined(__linux)
 965     tcc_define_symbol(s, "__linux__", NULL);
 966     tcc_define_symbol(s, "__linux", NULL);
 967 # endif
 968 # if defined(__FreeBSD__)
 969 #  define str(s) #s
 970     tcc_define_symbol(s, "__FreeBSD__", str( __FreeBSD__));
 971 #  undef str
 972 # endif
 973 # if defined(__FreeBSD_kernel__)
 974     tcc_define_symbol(s, "__FreeBSD_kernel__", NULL);
 975 # endif
 976 #endif
 977
 978     /* TinyCC & gcc defines */
 979 #if defined TCC_TARGET_PE && defined TCC_TARGET_X86_64
 980     tcc_define_symbol(s, "__SIZE_TYPE__", "unsigned long long");
 981     tcc_define_symbol(s, "__PTRDIFF_TYPE__", "long long");
 982 #else
 983     tcc_define_symbol(s, "__SIZE_TYPE__", "unsigned long");
 984     tcc_define_symbol(s, "__PTRDIFF_TYPE__", "long");
 985 #endif
 986
 987 #ifdef TCC_TARGET_PE
 988     tcc_define_symbol(s, "__WCHAR_TYPE__", "unsigned short");
 989 #else
 990     tcc_define_symbol(s, "__WCHAR_TYPE__", "int");
 991 #endif
 992
 993 #ifndef TCC_TARGET_PE
 994     /* glibc defines */
 995     tcc_define_symbol(s, "__REDIRECT(name, proto, alias)", "name proto __asm__ (#alias)");
 996     tcc_define_symbol(s, "__REDIRECT_NTH(name, proto, alias)", "name proto __asm__ (#alias) __THROW");
 997     /* default library paths */
 998     tcc_add_library_path(s, CONFIG_TCC_LIBPATHS);
 999     /* paths for crt objects */
1000     tcc_split_path(s, (void ***)&s->crt_paths, &s->nb_crt_paths, CONFIG_TCC_CRTPREFIX);
1001 #endif
1002
1003     /* no section zero */
1004     dynarray_add((void ***)&s->sections, &s->nb_sections, NULL);
1005
1006     /* create standard sections */
1007     text_section = new_section(s, ".text", SHT_PROGBITS, SHF_ALLOC | SHF_EXECINSTR);
1008     data_section = new_section(s, ".data", SHT_PROGBITS, SHF_ALLOC | SHF_WRITE);
1009     bss_section = new_section(s, ".bss", SHT_NOBITS, SHF_ALLOC | SHF_WRITE);
1010
1011     /* symbols are always generated for linking stage */
1012     symtab_section = new_symtab(s, ".symtab", SHT_SYMTAB, 0,
1013                                 ".strtab",
1014                                 ".hashtab", SHF_PRIVATE);
1015     strtab_section = symtab_section->link;
1016     s->symtab = symtab_section;
1017
1018     /* private symbol table for dynamic symbols */
1019     s->dynsymtab_section = new_symtab(s, ".dynsymtab", SHT_SYMTAB, SHF_PRIVATE,
1020                                       ".dynstrtab",
1021                                       ".dynhashtab", SHF_PRIVATE);
1022     s->alacarte_link = 1;
1023     s->nocommon = 1;
1024     s->section_align = ELF_PAGE_SIZE;
1025
1026 #ifdef CHAR_IS_UNSIGNED
1027     s->char_is_unsigned = 1;
1028 #endif
1029     /* enable this if you want symbols with leading underscore on windows: */
1030 #if 0 /* def TCC_TARGET_PE */
1031     s->leading_underscore = 1;
1032 #endif
1033 #ifdef TCC_TARGET_I386
1034     s->seg_size = 32;
1035 #endif
1036     return s;
1037 }
1038
1039 LIBTCCAPI void tcc_delete(TCCState *s1)
1040 {
1041     int i;
1042
1043     tcc_cleanup();
1044
1045     /* free all sections */
1046     for(i = 1; i < s1->nb_sections; i++)
1047         free_section(s1->sections[i]);
1048     dynarray_reset(&s1->sections, &s1->nb_sections);
1049
1050     for(i = 0; i < s1->nb_priv_sections; i++)
1051         free_section(s1->priv_sections[i]);
1052     dynarray_reset(&s1->priv_sections, &s1->nb_priv_sections);
1053
1054     /* free any loaded DLLs */
1055 #ifdef TCC_IS_NATIVE
1056     for ( i = 0; i < s1->nb_loaded_dlls; i++) {
1057         DLLReference *ref = s1->loaded_dlls[i];
1058         if ( ref->handle )
1059             dlclose(ref->handle);
1060     }
1061 #endif
1062
1063     /* free loaded dlls array */
1064     dynarray_reset(&s1->loaded_dlls, &s1->nb_loaded_dlls);
1065
1066     /* free library paths */
1067     dynarray_reset(&s1->library_paths, &s1->nb_library_paths);
1068     dynarray_reset(&s1->crt_paths, &s1->nb_crt_paths);
1069
1070     /* free include paths */
1071     dynarray_reset(&s1->cached_includes, &s1->nb_cached_includes);
1072     dynarray_reset(&s1->include_paths, &s1->nb_include_paths);
1073     dynarray_reset(&s1->sysinclude_paths, &s1->nb_sysinclude_paths);
1074
1075     tcc_free(s1->tcc_lib_path);
1076     tcc_free(s1->soname);
1077     tcc_free(s1->rpath);
1078     tcc_free(s1->init_symbol);
1079     tcc_free(s1->fini_symbol);
1080     tcc_free(s1->outfile);
1081     tcc_free(s1->deps_outfile);
1082     dynarray_reset(&s1->files, &s1->nb_files);
1083     dynarray_reset(&s1->target_deps, &s1->nb_target_deps);
1084
1085 #ifdef TCC_IS_NATIVE
1086 # ifdef HAVE_SELINUX
1087     munmap (s1->write_mem, s1->mem_size);
1088     munmap (s1->runtime_mem, s1->mem_size);
1089 # else
1090     tcc_free(s1->runtime_mem);
1091 # endif
1092 #endif
1093
1094     tcc_free(s1);
1095 }
1096
1097 LIBTCCAPI int tcc_add_include_path(TCCState *s, const char *pathname)
1098 {
1099     tcc_split_path(s, (void ***)&s->include_paths, &s->nb_include_paths, pathname);
1100     return 0;
1101 }
1102
1103 LIBTCCAPI int tcc_add_sysinclude_path(TCCState *s, const char *pathname)
1104 {
1105     tcc_split_path(s, (void ***)&s->sysinclude_paths, &s->nb_sysinclude_paths, pathname);
1106     return 0;
1107 }
1108
1109 ST_FUNC int tcc_add_file_internal(TCCState *s1, const char *filename, int flags)
1110 {
1111     const char *ext;
1112     ElfW(Ehdr) ehdr;
1113     int fd, ret, size;
1114
1115     /* find source file type with extension */
1116     ext = tcc_fileextension(filename);
1117     if (ext[0])
1118         ext++;
1119
1120 #ifdef CONFIG_TCC_ASM
1121     /* if .S file, define __ASSEMBLER__ like gcc does */
1122     if (!strcmp(ext, "S"))
1123         tcc_define_symbol(s1, "__ASSEMBLER__", NULL);
1124 #endif
1125
1126     /* open the file */
1127     ret = tcc_open(s1, filename);
1128     if (ret < 0) {
1129         if (flags & AFF_PRINT_ERROR)
1130             tcc_error_noabort("file '%s' not found", filename);
1131         return ret;
1132     }
1133
1134     /* update target deps */
1135     dynarray_add((void ***)&s1->target_deps, &s1->nb_target_deps,
1136             tcc_strdup(filename));
1137
1138     if (flags & AFF_PREPROCESS) {
1139         ret = tcc_preprocess(s1);
1140         goto the_end;
1141     }
1142
1143     if (!ext[0] || !PATHCMP(ext, "c")) {
1144         /* C file assumed */
1145         ret = tcc_compile(s1);
1146         goto the_end;
1147     }
1148
1149 #ifdef CONFIG_TCC_ASM
1150     if (!strcmp(ext, "S")) {
1151         /* preprocessed assembler */
1152         ret = tcc_assemble(s1, 1);
1153         goto the_end;
1154     }
1155
1156     if (!strcmp(ext, "s")) {
1157         /* non preprocessed assembler */
1158         ret = tcc_assemble(s1, 0);
1159         goto the_end;
1160     }
1161 #endif
1162
1163     fd = file->fd;
1164     /* assume executable format: auto guess file type */
1165     size = read(fd, &ehdr, sizeof(ehdr));
1166     lseek(fd, 0, SEEK_SET);
1167     if (size <= 0) {
1168         tcc_error_noabort("could not read header");
1169         goto the_end;
1170     }
1171
1172     if (size == sizeof(ehdr) &&
1173         ehdr.e_ident[0] == ELFMAG0 &&
1174         ehdr.e_ident[1] == ELFMAG1 &&
1175         ehdr.e_ident[2] == ELFMAG2 &&
1176         ehdr.e_ident[3] == ELFMAG3) {
1177
1178         /* do not display line number if error */
1179         file->line_num = 0;
1180         if (ehdr.e_type == ET_REL) {
1181             ret = tcc_load_object_file(s1, fd, 0);
1182             goto the_end;
1183
1184         }
1185 #ifndef TCC_TARGET_PE
1186         if (ehdr.e_type == ET_DYN) {
1187             if (s1->output_type == TCC_OUTPUT_MEMORY) {
1188 #ifdef TCC_IS_NATIVE
1189                 void *h;
1190                 h = dlopen(filename, RTLD_GLOBAL | RTLD_LAZY);
1191                 if (h)
1192 #endif
1193                     ret = 0;
1194             } else {
1195                 ret = tcc_load_dll(s1, fd, filename,
1196                                    (flags & AFF_REFERENCED_DLL) != 0);
1197             }
1198             goto the_end;
1199         }
1200 #endif
1201         tcc_error_noabort("unrecognized ELF file");
1202         goto the_end;
1203     }
1204
1205     if (memcmp((char *)&ehdr, ARMAG, 8) == 0) {
1206         file->line_num = 0; /* do not display line number if error */
1207         ret = tcc_load_archive(s1, fd);
1208         goto the_end;
1209     }
1210
1211 #ifdef TCC_TARGET_COFF
1212     if (*(uint16_t *)(&ehdr) == COFF_C67_MAGIC) {
1213         ret = tcc_load_coff(s1, fd);
1214         goto the_end;
1215     }
1216 #endif
1217
1218 #ifdef TCC_TARGET_PE
1219     ret = pe_load_file(s1, filename, fd);
1220 #else
1221     /* as GNU ld, consider it is an ld script if not recognized */
1222     ret = tcc_load_ldscript(s1);
1223 #endif
1224     if (ret < 0)
1225         tcc_error_noabort("unrecognized file type");
1226
1227 the_end:
1228     tcc_close();
1229     return ret;
1230 }
1231
1232 LIBTCCAPI int tcc_add_file(TCCState *s, const char *filename)
1233 {
1234     if (s->output_type == TCC_OUTPUT_PREPROCESS)
1235         return tcc_add_file_internal(s, filename, AFF_PRINT_ERROR | AFF_PREPROCESS);
1236     else
1237         return tcc_add_file_internal(s, filename, AFF_PRINT_ERROR);
1238 }
1239
1240 LIBTCCAPI int tcc_add_library_path(TCCState *s, const char *pathname)
1241 {
1242     tcc_split_path(s, (void ***)&s->library_paths, &s->nb_library_paths, pathname);
1243     return 0;
1244 }
1245
1246 static int tcc_add_library_internal(TCCState *s, const char *fmt,
1247     const char *filename, int flags, char **paths, int nb_paths)
1248 {
1249     char buf[1024];
1250     int i;
1251
1252     for(i = 0; i < nb_paths; i++) {
1253         snprintf(buf, sizeof(buf), fmt, paths[i], filename);
1254         if (tcc_add_file_internal(s, buf, flags) == 0)
1255             return 0;
1256     }
1257     return -1;
1258 }
1259
1260 /* find and load a dll. Return non zero if not found */
1261 /* XXX: add '-rpath' option support ? */
1262 ST_FUNC int tcc_add_dll(TCCState *s, const char *filename, int flags)
1263 {
1264     return tcc_add_library_internal(s, "%s/%s", filename, flags,
1265         s->library_paths, s->nb_library_paths);
1266 }
1267
1268 ST_FUNC int tcc_add_crt(TCCState *s, const char *filename)
1269 {
1270     if (-1 == tcc_add_library_internal(s, "%s/%s",
1271         filename, 0, s->crt_paths, s->nb_crt_paths))
1272         tcc_error_noabort("file '%s' not found", filename);
1273     return 0;
1274 }
1275
1276 /* the library name is the same as the argument of the '-l' option */
1277 LIBTCCAPI int tcc_add_library(TCCState *s, const char *libraryname)
1278 {
1279 #ifdef TCC_TARGET_PE
1280     const char *libs[] = { "%s/%s.def", "%s/lib%s.def", "%s/%s.dll", "%s/lib%s.dll", "%s/lib%s.a", NULL };
1281     const char **pp = s->static_link ? libs + 4 : libs;
1282 #else
1283     const char *libs[] = { "%s/lib%s.so", "%s/lib%s.a", NULL };
1284     const char **pp = s->static_link ? libs + 1 : libs;
1285 #endif
1286     while (*pp) {
1287         if (0 == tcc_add_library_internal(s, *pp,
1288             libraryname, 0, s->library_paths, s->nb_library_paths))
1289             return 0;
1290         ++pp;
1291     }
1292     return -1;
1293 }
1294
1295 LIBTCCAPI int tcc_add_symbol(TCCState *s, const char *name, const void *val)
1296 {
1297 #ifdef TCC_TARGET_PE
1298     /* On x86_64 'val' might not be reachable with a 32bit offset.
1299        So it is handled here as if it were in a DLL. */
1300     pe_putimport(s, 0, name, (uintptr_t)val);
1301 #else
1302     /* XXX: Same problem on linux but currently "solved" elsewhere
1303        via the rather dirty 'runtime_plt_and_got' hack. */
1304     add_elf_sym(symtab_section, (uintptr_t)val, 0,
1305         ELFW(ST_INFO)(STB_GLOBAL, STT_NOTYPE), 0,
1306         SHN_ABS, name);
1307 #endif
1308     return 0;
1309 }
1310
1311 LIBTCCAPI int tcc_set_output_type(TCCState *s, int output_type)
1312 {
1313     s->output_type = output_type;
1314
1315     if (!s->nostdinc) {
1316         /* default include paths */
1317         /* -isystem paths have already been handled */
1318         tcc_add_sysinclude_path(s, CONFIG_TCC_SYSINCLUDEPATHS);
1319     }
1320
1321     /* if bound checking, then add corresponding sections */
1322 #ifdef CONFIG_TCC_BCHECK
1323     if (s->do_bounds_check) {
1324         /* define symbol */
1325         tcc_define_symbol(s, "__BOUNDS_CHECKING_ON", NULL);
1326         /* create bounds sections */
1327         bounds_section = new_section(s, ".bounds",
1328                                      SHT_PROGBITS, SHF_ALLOC);
1329         lbounds_section = new_section(s, ".lbounds",
1330                                       SHT_PROGBITS, SHF_ALLOC);
1331     }
1332 #endif
1333
1334     if (s->char_is_unsigned) {
1335         tcc_define_symbol(s, "__CHAR_UNSIGNED__", NULL);
1336     }
1337
1338     /* add debug sections */
1339     if (s->do_debug) {
1340         /* stab symbols */
1341         stab_section = new_section(s, ".stab", SHT_PROGBITS, 0);
1342         stab_section->sh_entsize = sizeof(Stab_Sym);
1343         stabstr_section = new_section(s, ".stabstr", SHT_STRTAB, 0);
1344         put_elf_str(stabstr_section, "");
1345         stab_section->link = stabstr_section;
1346         /* put first entry */
1347         put_stabs("", 0, 0, 0, 0);
1348     }
1349
1350 #ifdef TCC_TARGET_PE
1351     tcc_add_library_path(s, CONFIG_TCC_LIBPATHS);
1352 # ifdef _WIN32
1353     tcc_add_systemdir(s);
1354 # endif
1355 #else
1356     /* add libc crt1/crti objects */
1357     if ((output_type == TCC_OUTPUT_EXE || output_type == TCC_OUTPUT_DLL) &&
1358         !s->nostdlib) {
1359         if (output_type != TCC_OUTPUT_DLL)
1360             tcc_add_crt(s, "crt1.o");
1361         tcc_add_crt(s, "crti.o");
1362     }
1363 #endif
1364     return 0;
1365 }
1366
1367 LIBTCCAPI void tcc_set_lib_path(TCCState *s, const char *path)
1368 {
1369     tcc_free(s->tcc_lib_path);
1370     s->tcc_lib_path = tcc_strdup(path);
1371 }
1372
1373 #define WD_ALL    0x0001 /* warning is activated when using -Wall */
1374 #define FD_INVERT 0x0002 /* invert value before storing */
1375
1376 typedef struct FlagDef {
1377     uint16_t offset;
1378     uint16_t flags;
1379     const char *name;
1380 } FlagDef;
1381
1382 static const FlagDef warning_defs[] = {
1383     { offsetof(TCCState, warn_unsupported), 0, "unsupported" },
1384     { offsetof(TCCState, warn_write_strings), 0, "write-strings" },
1385     { offsetof(TCCState, warn_error), 0, "error" },
1386     { offsetof(TCCState, warn_implicit_function_declaration), WD_ALL,
1387       "implicit-function-declaration" },
1388 };
1389
1390 ST_FUNC int set_flag(TCCState *s, const FlagDef *flags, int nb_flags,
1391                     const char *name, int value)
1392 {
1393     int i;
1394     const FlagDef *p;
1395     const char *r;
1396
1397     r = name;
1398     if (r[0] == 'n' && r[1] == 'o' && r[2] == '-') {
1399         r += 3;
1400         value = !value;
1401     }
1402     for(i = 0, p = flags; i < nb_flags; i++, p++) {
1403         if (!strcmp(r, p->name))
1404             goto found;
1405     }
1406     return -1;
1407  found:
1408     if (p->flags & FD_INVERT)
1409         value = !value;
1410     *(int *)((uint8_t *)s + p->offset) = value;
1411     return 0;
1412 }
1413
1414 /* set/reset a warning */
1415 static int tcc_set_warning(TCCState *s, const char *warning_name, int value)
1416 {
1417     int i;
1418     const FlagDef *p;
1419
1420     if (!strcmp(warning_name, "all")) {
1421         for(i = 0, p = warning_defs; i < countof(warning_defs); i++, p++) {
1422             if (p->flags & WD_ALL)
1423                 *(int *)((uint8_t *)s + p->offset) = 1;
1424         }
1425         return 0;
1426     } else {
1427         return set_flag(s, warning_defs, countof(warning_defs),
1428                         warning_name, value);
1429     }
1430 }
1431
1432 static const FlagDef flag_defs[] = {
1433     { offsetof(TCCState, char_is_unsigned), 0, "unsigned-char" },
1434     { offsetof(TCCState, char_is_unsigned), FD_INVERT, "signed-char" },
1435     { offsetof(TCCState, nocommon), FD_INVERT, "common" },
1436     { offsetof(TCCState, leading_underscore), 0, "leading-underscore" },
1437 };
1438
1439 /* set/reset a flag */
1440 static int tcc_set_flag(TCCState *s, const char *flag_name, int value)
1441 {
1442     return set_flag(s, flag_defs, countof(flag_defs),
1443                     flag_name, value);
1444 }
1445
1446
1447 static int strstart(const char *val, const char **str)
1448 {
1449     const char *p, *q;
1450     p = *str;
1451     q = val;
1452     while (*q) {
1453         if (*p != *q)
1454             return 0;
1455         p++;
1456         q++;
1457     }
1458     *str = p;
1459     return 1;
1460 }
1461
1462 /* Like strstart, but automatically takes into account that ld options can
1463  *
1464  * - start with double or single dash (e.g. '--soname' or '-soname')
1465  * - arguments can be given as separate or after '=' (e.g. '-Wl,-soname,x.so'
1466  *   or '-Wl,-soname=x.so')
1467  *
1468  * you provide `val` always in 'option[=]' form (no leading -)
1469  */
1470 static int link_option(const char *str, const char *val, const char **ptr)
1471 {
1472     const char *p, *q;
1473
1474     /* there should be 1 or 2 dashes */
1475     if (*str++ != '-')
1476         return 0;
1477     if (*str == '-')
1478         str++;
1479
1480     /* then str & val should match (potentialy up to '=') */
1481     p = str;
1482     q = val;
1483
1484     while (*q != '\0' && *q != '=') {
1485         if (*p != *q)
1486             return 0;
1487         p++;
1488         q++;
1489     }
1490
1491     /* '=' near eos means ',' or '=' is ok */
1492     if (*q == '=') {
1493         if (*p != ',' && *p != '=')
1494             return 0;
1495         p++;
1496         q++;
1497     }
1498
1499     if (ptr)
1500         *ptr = p;
1501     return 1;
1502 }
1503
1504 static const char *skip_linker_arg(const char **str)
1505 {
1506     const char *s1 = *str;
1507     const char *s2 = strchr(s1, ',');
1508     *str = s2 ? s2++ : (s2 = s1 + strlen(s1));
1509     return s2;
1510 }
1511
1512 static char *copy_linker_arg(const char *p)
1513 {
1514     const char *q = p;
1515     skip_linker_arg(&q);
1516     return pstrncpy(tcc_malloc(q - p + 1), p, q - p);
1517 }
1518
1519 /* set linker options */
1520 static int tcc_set_linker(TCCState *s, const char *option)
1521 {
1522     while (option && *option) {
1523
1524         const char *p = option;
1525         char *end = NULL;
1526         int ignoring = 0;
1527
1528         if (link_option(option, "Bsymbolic", &p)) {
1529             s->symbolic = 1;
1530         } else if (link_option(option, "nostdlib", &p)) {
1531             s->nostdlib = 1;
1532         } else if (link_option(option, "fini=", &p)) {
1533             s->fini_symbol = copy_linker_arg(p);
1534             ignoring = 1;
1535         } else if (link_option(option, "image-base=", &p)
1536                 || link_option(option, "Ttext=", &p)) {
1537             s->text_addr = strtoull(p, &end, 16);
1538             s->has_text_addr = 1;
1539         } else if (link_option(option, "init=", &p)) {
1540             s->init_symbol = copy_linker_arg(p);
1541             ignoring = 1;
1542         } else if (link_option(option, "oformat=", &p)) {
1543 #if defined(TCC_TARGET_PE)
1544             if (strstart("pe-", &p)) {
1545 #elif defined(TCC_TARGET_X86_64)
1546             if (strstart("elf64-", &p)) {
1547 #else
1548             if (strstart("elf32-", &p)) {
1549 #endif
1550                 s->output_format = TCC_OUTPUT_FORMAT_ELF;
1551             } else if (!strcmp(p, "binary")) {
1552                 s->output_format = TCC_OUTPUT_FORMAT_BINARY;
1553 #ifdef TCC_TARGET_COFF
1554             } else if (!strcmp(p, "coff")) {
1555                 s->output_format = TCC_OUTPUT_FORMAT_COFF;
1556 #endif
1557             } else
1558                 goto err;
1559
1560         } else if (link_option(option, "rpath=", &p)) {
1561             s->rpath = copy_linker_arg(p);
1562         } else if (link_option(option, "section-alignment=", &p)) {
1563             s->section_align = strtoul(p, &end, 16);
1564         } else if (link_option(option, "soname=", &p)) {
1565             s->soname = copy_linker_arg(p);
1566 #ifdef TCC_TARGET_PE
1567         } else if (link_option(option, "file-alignment=", &p)) {
1568             s->pe_file_align = strtoul(p, &end, 16);
1569         } else if (link_option(option, "stack=", &p)) {
1570             s->pe_stack_size = strtoul(p, &end, 10);
1571         } else if (link_option(option, "subsystem=", &p)) {
1572 #if defined(TCC_TARGET_I386) || defined(TCC_TARGET_X86_64)
1573             if (!strcmp(p, "native")) {
1574                 s->pe_subsystem = 1;
1575             } else if (!strcmp(p, "console")) {
1576                 s->pe_subsystem = 3;
1577             } else if (!strcmp(p, "gui")) {
1578                 s->pe_subsystem = 2;
1579             } else if (!strcmp(p, "posix")) {
1580                 s->pe_subsystem = 7;
1581             } else if (!strcmp(p, "efiapp")) {
1582                 s->pe_subsystem = 10;
1583             } else if (!strcmp(p, "efiboot")) {
1584                 s->pe_subsystem = 11;
1585             } else if (!strcmp(p, "efiruntime")) {
1586                 s->pe_subsystem = 12;
1587             } else if (!strcmp(p, "efirom")) {
1588                 s->pe_subsystem = 13;
1589 #elif defined(TCC_TARGET_ARM)
1590             if (!strcmp(p, "wince")) {
1591                 s->pe_subsystem = 9;
1592 #endif
1593             } else
1594                 goto err;
1595 #endif
1596         } else
1597             goto err;
1598
1599         if (ignoring && s->warn_unsupported) err: {
1600             char buf[100], *e;
1601             pstrcpy(buf, sizeof buf, e = copy_linker_arg(option)), tcc_free(e);
1602             if (ignoring)
1603                 tcc_warning("unsupported linker option '%s'", buf);
1604             else
1605                 tcc_error("unsupported linker option '%s'", buf);
1606         }
1607         option = skip_linker_arg(&p);
1608     }
1609     return 0;
1610 }
1611
1612 typedef struct TCCOption {
1613     const char *name;
1614     uint16_t index;
1615     uint16_t flags;
1616 } TCCOption;
1617
1618 enum {
1619     TCC_OPTION_HELP,
1620     TCC_OPTION_I,
1621     TCC_OPTION_D,
1622     TCC_OPTION_U,
1623     TCC_OPTION_L,
1624     TCC_OPTION_B,
1625     TCC_OPTION_l,
1626     TCC_OPTION_bench,
1627     TCC_OPTION_bt,
1628     TCC_OPTION_b,
1629     TCC_OPTION_g,
1630     TCC_OPTION_c,
1631     TCC_OPTION_static,
1632     TCC_OPTION_shared,
1633     TCC_OPTION_soname,
1634     TCC_OPTION_o,
1635     TCC_OPTION_r,
1636     TCC_OPTION_s,
1637     TCC_OPTION_Wl,
1638     TCC_OPTION_W,
1639     TCC_OPTION_O,
1640     TCC_OPTION_m,
1641     TCC_OPTION_f,
1642     TCC_OPTION_isystem,
1643     TCC_OPTION_nostdinc,
1644     TCC_OPTION_nostdlib,
1645     TCC_OPTION_print_search_dirs,
1646     TCC_OPTION_rdynamic,
1647     TCC_OPTION_pedantic,
1648     TCC_OPTION_pthread,
1649     TCC_OPTION_run,
1650     TCC_OPTION_norunsrc,
1651     TCC_OPTION_v,
1652     TCC_OPTION_w,
1653     TCC_OPTION_pipe,
1654     TCC_OPTION_E,
1655     TCC_OPTION_MD,
1656     TCC_OPTION_MF,
1657     TCC_OPTION_x,
1658     TCC_OPTION_dumpversion,
1659 };
1660
1661 #define TCC_OPTION_HAS_ARG 0x0001
1662 #define TCC_OPTION_NOSEP   0x0002 /* cannot have space before option and arg */
1663
1664 static const TCCOption tcc_options[] = {
1665     { "h", TCC_OPTION_HELP, 0 },
1666     { "-help", TCC_OPTION_HELP, 0 },
1667     { "?", TCC_OPTION_HELP, 0 },
1668     { "I", TCC_OPTION_I, TCC_OPTION_HAS_ARG },
1669     { "D", TCC_OPTION_D, TCC_OPTION_HAS_ARG },
1670     { "U", TCC_OPTION_U, TCC_OPTION_HAS_ARG },
1671     { "L", TCC_OPTION_L, TCC_OPTION_HAS_ARG },
1672     { "B", TCC_OPTION_B, TCC_OPTION_HAS_ARG },
1673     { "l", TCC_OPTION_l, TCC_OPTION_HAS_ARG | TCC_OPTION_NOSEP },
1674     { "bench", TCC_OPTION_bench, 0 },
1675 #ifdef CONFIG_TCC_BACKTRACE
1676     { "bt", TCC_OPTION_bt, TCC_OPTION_HAS_ARG },
1677 #endif
1678 #ifdef CONFIG_TCC_BCHECK
1679     { "b", TCC_OPTION_b, 0 },
1680 #endif
1681     { "g", TCC_OPTION_g, TCC_OPTION_HAS_ARG | TCC_OPTION_NOSEP },
1682     { "c", TCC_OPTION_c, 0 },
1683     { "static", TCC_OPTION_static, 0 },
1684     { "shared", TCC_OPTION_shared, 0 },
1685     { "soname", TCC_OPTION_soname, TCC_OPTION_HAS_ARG },
1686     { "o", TCC_OPTION_o, TCC_OPTION_HAS_ARG },
1687     { "pedantic", TCC_OPTION_pedantic, 0},
1688     { "pthread", TCC_OPTION_pthread, 0},
1689     { "run", TCC_OPTION_run, TCC_OPTION_HAS_ARG | TCC_OPTION_NOSEP },
1690     { "norunsrc", TCC_OPTION_norunsrc, 0 },
1691     { "rdynamic", TCC_OPTION_rdynamic, 0 },
1692     { "r", TCC_OPTION_r, 0 },
1693     { "s", TCC_OPTION_s, 0 },
1694     { "Wl,", TCC_OPTION_Wl, TCC_OPTION_HAS_ARG | TCC_OPTION_NOSEP },
1695     { "W", TCC_OPTION_W, TCC_OPTION_HAS_ARG | TCC_OPTION_NOSEP },
1696     { "O", TCC_OPTION_O, TCC_OPTION_HAS_ARG | TCC_OPTION_NOSEP },
1697     { "m", TCC_OPTION_m, TCC_OPTION_HAS_ARG },
1698     { "f", TCC_OPTION_f, TCC_OPTION_HAS_ARG | TCC_OPTION_NOSEP },
1699     { "isystem", TCC_OPTION_isystem, TCC_OPTION_HAS_ARG },
1700     { "nostdinc", TCC_OPTION_nostdinc, 0 },
1701     { "nostdlib", TCC_OPTION_nostdlib, 0 },
1702     { "print-search-dirs", TCC_OPTION_print_search_dirs, 0 },
1703     { "v", TCC_OPTION_v, TCC_OPTION_HAS_ARG | TCC_OPTION_NOSEP },
1704     { "w", TCC_OPTION_w, 0 },
1705     { "pipe", TCC_OPTION_pipe, 0},
1706     { "E", TCC_OPTION_E, 0},
1707     { "MD", TCC_OPTION_MD, 0},
1708     { "MF", TCC_OPTION_MF, TCC_OPTION_HAS_ARG },
1709     { "x", TCC_OPTION_x, TCC_OPTION_HAS_ARG },
1710     { "dumpversion", TCC_OPTION_dumpversion, 0},
1711     { NULL, 0, 0 },
1712 };
1713
1714 static void parse_option_D(TCCState *s1, const char *optarg)
1715 {
1716     char *sym = tcc_strdup(optarg);
1717     char *value = strchr(sym, '=');
1718     if (value)
1719         *value++ = '\0';
1720     tcc_define_symbol(s1, sym, value);
1721     tcc_free(sym);
1722 }
1723
1724 PUB_FUNC int tcc_parse_args(TCCState *s, int argc, char **argv)
1725 {
1726     const TCCOption *popt;
1727     const char *optarg, *r;
1728     int run = 0;
1729     int norunsrc = 0;
1730     int pthread = 0;
1731     int optind = 0;
1732
1733     /* collect -Wl options for input such as "-Wl,-rpath -Wl,<path>" */
1734     CString linker_arg;
1735     cstr_new(&linker_arg);
1736
1737     while (optind < argc) {
1738
1739         r = argv[optind++];
1740         if (r[0] != '-' || r[1] == '\0') {
1741             /* add a new file */
1742             if (!run || !norunsrc)
1743               dynarray_add((void ***)&s->files, &s->nb_files, tcc_strdup(r));
1744             if (run) {
1745                 optind--;
1746                 /* argv[0] will be this file */
1747                 break;
1748             }
1749             continue;
1750         }
1751
1752         /* find option in table */
1753         for(popt = tcc_options; ; ++popt) {
1754             const char *p1 = popt->name;
1755             const char *r1 = r + 1;
1756             if (p1 == NULL)
1757                 tcc_error("invalid option -- '%s'", r);
1758             if (!strstart(p1, &r1))
1759                 continue;
1760             optarg = r1;
1761             if (popt->flags & TCC_OPTION_HAS_ARG) {
1762                 if (*r1 == '\0' && !(popt->flags & TCC_OPTION_NOSEP)) {
1763                     if (optind >= argc)
1764                         tcc_error("argument to '%s' is missing", r);
1765                     optarg = argv[optind++];
1766                 }
1767             } else if (*r1 != '\0')
1768                 continue;
1769             break;
1770         }
1771
1772         switch(popt->index) {
1773         case TCC_OPTION_HELP:
1774             return 0;
1775         case TCC_OPTION_I:
1776             if (tcc_add_include_path(s, optarg) < 0)
1777                 tcc_error("too many include paths");
1778             break;
1779         case TCC_OPTION_D:
1780             parse_option_D(s, optarg);
1781             break;
1782         case TCC_OPTION_U:
1783             tcc_undefine_symbol(s, optarg);
1784             break;
1785         case TCC_OPTION_L:
1786             tcc_add_library_path(s, optarg);
1787             break;
1788         case TCC_OPTION_B:
1789             /* set tcc utilities path (mainly for tcc development) */
1790             tcc_set_lib_path(s, optarg);
1791             break;
1792         case TCC_OPTION_l:
1793             dynarray_add((void ***)&s->files, &s->nb_files, tcc_strdup(r));
1794             s->nb_libraries++;
1795             break;
1796         case TCC_OPTION_pthread:
1797             parse_option_D(s, "_REENTRANT");
1798             pthread = 1;
1799             break;
1800         case TCC_OPTION_bench:
1801             s->do_bench = 1;
1802             break;
1803 #ifdef CONFIG_TCC_BACKTRACE
1804         case TCC_OPTION_bt:
1805             tcc_set_num_callers(atoi(optarg));
1806             break;
1807 #endif
1808 #ifdef CONFIG_TCC_BCHECK
1809         case TCC_OPTION_b:
1810             s->do_bounds_check = 1;
1811             s->do_debug = 1;
1812             break;
1813 #endif
1814         case TCC_OPTION_g:
1815             s->do_debug = 1;
1816             break;
1817         case TCC_OPTION_c:
1818             s->output_type = TCC_OUTPUT_OBJ;
1819             break;
1820         case TCC_OPTION_static:
1821             s->static_link = 1;
1822             break;
1823         case TCC_OPTION_shared:
1824             s->output_type = TCC_OUTPUT_DLL;
1825             break;
1826         case TCC_OPTION_soname:
1827             s->soname = tcc_strdup(optarg);
1828             break;
1829         case TCC_OPTION_m:
1830             s->option_m = tcc_strdup(optarg);
1831             break;
1832         case TCC_OPTION_o:
1833             s->outfile = tcc_strdup(optarg);
1834             break;
1835         case TCC_OPTION_r:
1836             /* generate a .o merging several output files */
1837             s->option_r = 1;
1838             s->output_type = TCC_OUTPUT_OBJ;
1839             break;
1840         case TCC_OPTION_isystem:
1841             tcc_add_sysinclude_path(s, optarg);
1842             break;
1843         case TCC_OPTION_nostdinc:
1844             s->nostdinc = 1;
1845             break;
1846         case TCC_OPTION_nostdlib:
1847             s->nostdlib = 1;
1848             break;
1849         case TCC_OPTION_print_search_dirs:
1850             s->print_search_dirs = 1;
1851             break;
1852         case TCC_OPTION_run:
1853             s->output_type = TCC_OUTPUT_MEMORY;
1854             tcc_set_options(s, optarg);
1855             run = 1;
1856             break;
1857         case TCC_OPTION_norunsrc:
1858             norunsrc = 1;
1859             break;
1860         case TCC_OPTION_v:
1861             do ++s->verbose; while (*optarg++ == 'v');
1862             break;
1863         case TCC_OPTION_f:
1864             if (tcc_set_flag(s, optarg, 1) < 0 && s->warn_unsupported)
1865                 goto unsupported_option;
1866             break;
1867         case TCC_OPTION_W:
1868             if (tcc_set_warning(s, optarg, 1) < 0 &&
1869                 s->warn_unsupported)
1870                 goto unsupported_option;
1871             break;
1872         case TCC_OPTION_w:
1873             s->warn_none = 1;
1874             break;
1875         case TCC_OPTION_rdynamic:
1876             s->rdynamic = 1;
1877             break;
1878         case TCC_OPTION_Wl:
1879             if (linker_arg.size)
1880                 --linker_arg.size, cstr_ccat(&linker_arg, ',');
1881             cstr_cat(&linker_arg, optarg);
1882             cstr_ccat(&linker_arg, '\0');
1883             break;
1884         case TCC_OPTION_E:
1885             s->output_type = TCC_OUTPUT_PREPROCESS;
1886             break;
1887         case TCC_OPTION_MD:
1888             s->gen_deps = 1;
1889             break;
1890         case TCC_OPTION_MF:
1891             s->deps_outfile = tcc_strdup(optarg);
1892             break;
1893         case TCC_OPTION_dumpversion:
1894             printf ("%s\n", TCC_VERSION);
1895             exit(0);
1896         case TCC_OPTION_O:
1897         case TCC_OPTION_pedantic:
1898         case TCC_OPTION_pipe:
1899         case TCC_OPTION_s:
1900         case TCC_OPTION_x:
1901             /* ignored */
1902             break;
1903         default:
1904             if (s->warn_unsupported) {
1905             unsupported_option:
1906                 tcc_warning("unsupported option '%s'", r);
1907             }
1908             break;
1909         }
1910     }
1911
1912     if (pthread && s->output_type != TCC_OUTPUT_OBJ)
1913         tcc_set_options(s, "-lpthread");
1914
1915     tcc_set_linker(s, (const char *)linker_arg.data);
1916     cstr_free(&linker_arg);
1917
1918     return optind;
1919 }
1920
1921 LIBTCCAPI int tcc_set_options(TCCState *s, const char *str)
1922 {
1923     const char *s1;
1924     char **argv, *arg;
1925     int argc, len;
1926     int ret;
1927
1928     argc = 0, argv = NULL;
1929     for(;;) {
1930         while (is_space(*str))
1931             str++;
1932         if (*str == '\0')
1933             break;
1934         s1 = str;
1935         while (*str != '\0' && !is_space(*str))
1936             str++;
1937         len = str - s1;
1938         arg = tcc_malloc(len + 1);
1939         pstrncpy(arg, s1, len);
1940         dynarray_add((void ***)&argv, &argc, arg);
1941     }
1942     ret = tcc_parse_args(s, argc, argv);
1943     dynarray_reset(&argv, &argc);
1944     return ret;
1945 }
1946
1947 PUB_FUNC void tcc_print_stats(TCCState *s, int64_t total_time)
1948 {
1949     double tt;
1950     tt = (double)total_time / 1000000.0;
1951     if (tt < 0.001)
1952         tt = 0.001;
1953     if (total_bytes < 1)
1954         total_bytes = 1;
1955     printf("%d idents, %d lines, %d bytes, %0.3f s, %d lines/s, %0.1f MB/s\n",
1956            tok_ident - TOK_IDENT, total_lines, total_bytes,
1957            tt, (int)(total_lines / tt),
1958            total_bytes / tt / 1000000.0);
1959 }
1960
1961 PUB_FUNC void tcc_set_environment(TCCState *s)
1962 {
1963     char * path;
1964
1965     path = getenv("C_INCLUDE_PATH");
1966     if(path != NULL) {
1967         tcc_add_include_path(s, path);
1968     }
1969     path = getenv("CPATH");
1970     if(path != NULL) {
1971         tcc_add_include_path(s, path);
1972     }
1973     path = getenv("LIBRARY_PATH");
1974     if(path != NULL) {
1975         tcc_add_library_path(s, path);
1976     }
1977 }