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 #ifdef CONFIG_TCC_BACKTRACE
  36 ST_DATA int num_callers = 6;
  37 ST_DATA const char **rt_bound_error_msg;
  38 ST_DATA void *rt_prog_main;
  39 #endif
  40
  41 /********************************************************/
  42
  43 #ifndef NOTALLINONE
  44 #include "tccpp.c"
  45 #include "tccgen.c"
  46 #include "tccelf.c"
  47 #include "tccrun.c"
  48 #ifdef TCC_TARGET_I386
  49 #include "i386-gen.c"
  50 #endif
  51 #ifdef TCC_TARGET_ARM
  52 #include "arm-gen.c"
  53 #endif
  54 #ifdef TCC_TARGET_C67
  55 #include "c67-gen.c"
  56 #endif
  57 #ifdef TCC_TARGET_X86_64
  58 #include "x86_64-gen.c"
  59 #endif
  60 #ifdef CONFIG_TCC_ASM
  61 #include "tccasm.c"
  62 #if defined TCC_TARGET_I386 || defined TCC_TARGET_X86_64
  63 #include "i386-asm.c"
  64 #endif
  65 #endif
  66 #ifdef TCC_TARGET_COFF
  67 #include "tcccoff.c"
  68 #endif
  69 #ifdef TCC_TARGET_PE
  70 #include "tccpe.c"
  71 #endif
  72 #endif /* ALL_IN_ONE */
  73
  74 /********************************************************/
  75 #ifndef CONFIG_TCC_ASM
  76 ST_FUNC void asm_instr(void)
  77 {
  78     error("inline asm() not supported");
  79 }
  80 ST_FUNC void asm_global_instr(void)
  81 {
  82     error("inline asm() not supported");
  83 }
  84 #endif
  85
  86 /********************************************************/
  87
  88 #ifdef _WIN32
  89 static char *normalize_slashes(char *path)
  90 {
  91     char *p;
  92     for (p = path; *p; ++p)
  93         if (*p == '\\')
  94             *p = '/';
  95     return path;
  96 }
  97
  98 static HMODULE tcc_module;
  99
 100 /* on win32, we suppose the lib and includes are at the location of 'tcc.exe' */
 101 static void tcc_set_lib_path_w32(TCCState *s)
 102 {
 103     char path[1024], *p;
 104     GetModuleFileNameA(tcc_module, path, sizeof path);
 105     p = tcc_basename(normalize_slashes(strlwr(path)));
 106     if (p - 5 > path && 0 == strncmp(p - 5, "/bin/", 5))
 107         p -= 5;
 108     else if (p > path)
 109         p--;
 110     *p = 0;
 111     tcc_set_lib_path(s, path);
 112 }
 113
 114 #ifndef CONFIG_TCC_STATIC
 115 void dlclose(void *p)
 116 {
 117     FreeLibrary((HMODULE)p);
 118 }
 119 #endif
 120
 121 #ifdef LIBTCC_AS_DLL
 122 BOOL WINAPI DllMain (HANDLE hDll, DWORD dwReason, LPVOID lpReserved)
 123 {
 124     if (DLL_PROCESS_ATTACH == dwReason)
 125         tcc_module = hDll;
 126     return TRUE;
 127 }
 128 #endif
 129 #endif
 130
 131 /********************************************************/
 132 /* copy a string and truncate it. */
 133 PUB_FUNC char *pstrcpy(char *buf, int buf_size, const char *s)
 134 {
 135     char *q, *q_end;
 136     int c;
 137
 138     if (buf_size > 0) {
 139         q = buf;
 140         q_end = buf + buf_size - 1;
 141         while (q < q_end) {
 142             c = *s++;
 143             if (c == '\0')
 144                 break;
 145             *q++ = c;
 146         }
 147         *q = '\0';
 148     }
 149     return buf;
 150 }
 151
 152 /* strcat and truncate. */
 153 PUB_FUNC char *pstrcat(char *buf, int buf_size, const char *s)
 154 {
 155     int len;
 156     len = strlen(buf);
 157     if (len < buf_size)
 158         pstrcpy(buf + len, buf_size - len, s);
 159     return buf;
 160 }
 161
 162 /* extract the basename of a file */
 163 PUB_FUNC char *tcc_basename(const char *name)
 164 {
 165     char *p = strchr(name, 0);
 166     while (p > name && !IS_PATHSEP(p[-1]))
 167         --p;
 168     return p;
 169 }
 170
 171 PUB_FUNC char *tcc_fileextension (const char *name)
 172 {
 173     char *b = tcc_basename(name);
 174     char *e = strrchr(b, '.');
 175     return e ? e : strchr(b, 0);
 176 }
 177
 178 /********************************************************/
 179 /* memory management */
 180
 181 #undef free
 182 #undef malloc
 183 #undef realloc
 184
 185 #ifdef MEM_DEBUG
 186 int mem_cur_size;
 187 int mem_max_size;
 188 unsigned malloc_usable_size(void*);
 189 #endif
 190
 191 PUB_FUNC void tcc_free(void *ptr)
 192 {
 193 #ifdef MEM_DEBUG
 194     mem_cur_size -= malloc_usable_size(ptr);
 195 #endif
 196     free(ptr);
 197 }
 198
 199 PUB_FUNC void *tcc_malloc(unsigned long size)
 200 {
 201     void *ptr;
 202     ptr = malloc(size);
 203     if (!ptr && size)
 204         error("memory full");
 205 #ifdef MEM_DEBUG
 206     mem_cur_size += malloc_usable_size(ptr);
 207     if (mem_cur_size > mem_max_size)
 208         mem_max_size = mem_cur_size;
 209 #endif
 210     return ptr;
 211 }
 212
 213 PUB_FUNC void *tcc_mallocz(unsigned long size)
 214 {
 215     void *ptr;
 216     ptr = tcc_malloc(size);
 217     memset(ptr, 0, size);
 218     return ptr;
 219 }
 220
 221 PUB_FUNC void *tcc_realloc(void *ptr, unsigned long size)
 222 {
 223     void *ptr1;
 224 #ifdef MEM_DEBUG
 225     mem_cur_size -= malloc_usable_size(ptr);
 226 #endif
 227     ptr1 = realloc(ptr, size);
 228 #ifdef MEM_DEBUG
 229     /* NOTE: count not correct if alloc error, but not critical */
 230     mem_cur_size += malloc_usable_size(ptr1);
 231     if (mem_cur_size > mem_max_size)
 232         mem_max_size = mem_cur_size;
 233 #endif
 234     return ptr1;
 235 }
 236
 237 PUB_FUNC char *tcc_strdup(const char *str)
 238 {
 239     char *ptr;
 240     ptr = tcc_malloc(strlen(str) + 1);
 241     strcpy(ptr, str);
 242     return ptr;
 243 }
 244
 245 PUB_FUNC void tcc_memstats(void)
 246 {
 247 #ifdef MEM_DEBUG
 248     printf("memory in use: %d\n", mem_cur_size);
 249 #endif
 250 }
 251
 252 #define free(p) use_tcc_free(p)
 253 #define malloc(s) use_tcc_malloc(s)
 254 #define realloc(p, s) use_tcc_realloc(p, s)
 255
 256 /********************************************************/
 257 /* dynarrays */
 258
 259 PUB_FUNC void dynarray_add(void ***ptab, int *nb_ptr, void *data)
 260 {
 261     int nb, nb_alloc;
 262     void **pp;
 263
 264     nb = *nb_ptr;
 265     pp = *ptab;
 266     /* every power of two we double array size */
 267     if ((nb & (nb - 1)) == 0) {
 268         if (!nb)
 269             nb_alloc = 1;
 270         else
 271             nb_alloc = nb * 2;
 272         pp = tcc_realloc(pp, nb_alloc * sizeof(void *));
 273         if (!pp)
 274             error("memory full");
 275         *ptab = pp;
 276     }
 277     pp[nb++] = data;
 278     *nb_ptr = nb;
 279 }
 280
 281 PUB_FUNC void dynarray_reset(void *pp, int *n)
 282 {
 283     void **p;
 284     for (p = *(void***)pp; *n; ++p, --*n)
 285         if (*p)
 286             tcc_free(*p);
 287     tcc_free(*(void**)pp);
 288     *(void**)pp = NULL;
 289 }
 290
 291 /* we use our own 'finite' function to avoid potential problems with
 292    non standard math libs */
 293 /* XXX: endianness dependent */
 294 ST_FUNC int ieee_finite(double d)
 295 {
 296     int *p = (int *)&d;
 297     return ((unsigned)((p[1] | 0x800fffff) + 1)) >> 31;
 298 }
 299
 300 /********************************************************/
 301
 302 ST_FUNC Section *new_section(TCCState *s1, const char *name, int sh_type, int sh_flags)
 303 {
 304     Section *sec;
 305
 306     sec = tcc_mallocz(sizeof(Section) + strlen(name));
 307     strcpy(sec->name, name);
 308     sec->sh_type = sh_type;
 309     sec->sh_flags = sh_flags;
 310     switch(sh_type) {
 311     case SHT_HASH:
 312     case SHT_REL:
 313     case SHT_RELA:
 314     case SHT_DYNSYM:
 315     case SHT_SYMTAB:
 316     case SHT_DYNAMIC:
 317         sec->sh_addralign = 4;
 318         break;
 319     case SHT_STRTAB:
 320         sec->sh_addralign = 1;
 321         break;
 322     default:
 323         sec->sh_addralign = 32; /* default conservative alignment */
 324         break;
 325     }
 326
 327     if (sh_flags & SHF_PRIVATE) {
 328         dynarray_add((void ***)&s1->priv_sections, &s1->nb_priv_sections, sec);
 329     } else {
 330         sec->sh_num = s1->nb_sections;
 331         dynarray_add((void ***)&s1->sections, &s1->nb_sections, sec);
 332     }
 333
 334     return sec;
 335 }
 336
 337 static void free_section(Section *s)
 338 {
 339     tcc_free(s->data);
 340 }
 341
 342 /* realloc section and set its content to zero */
 343 ST_FUNC void section_realloc(Section *sec, unsigned long new_size)
 344 {
 345     unsigned long size;
 346     unsigned char *data;
 347
 348     size = sec->data_allocated;
 349     if (size == 0)
 350         size = 1;
 351     while (size < new_size)
 352         size = size * 2;
 353     data = tcc_realloc(sec->data, size);
 354     if (!data)
 355         error("memory full");
 356     memset(data + sec->data_allocated, 0, size - sec->data_allocated);
 357     sec->data = data;
 358     sec->data_allocated = size;
 359 }
 360
 361 /* reserve at least 'size' bytes in section 'sec' from
 362    sec->data_offset. */
 363 ST_FUNC void *section_ptr_add(Section *sec, unsigned long size)
 364 {
 365     unsigned long offset, offset1;
 366
 367     offset = sec->data_offset;
 368     offset1 = offset + size;
 369     if (offset1 > sec->data_allocated)
 370         section_realloc(sec, offset1);
 371     sec->data_offset = offset1;
 372     return sec->data + offset;
 373 }
 374
 375 /* reserve at least 'size' bytes from section start */
 376 ST_FUNC void section_reserve(Section *sec, unsigned long size)
 377 {
 378     if (size > sec->data_allocated)
 379         section_realloc(sec, size);
 380     if (size > sec->data_offset)
 381         sec->data_offset = size;
 382 }
 383
 384 /* return a reference to a section, and create it if it does not
 385    exists */
 386 ST_FUNC Section *find_section(TCCState *s1, const char *name)
 387 {
 388     Section *sec;
 389     int i;
 390     for(i = 1; i < s1->nb_sections; i++) {
 391         sec = s1->sections[i];
 392         if (!strcmp(name, sec->name))
 393             return sec;
 394     }
 395     /* sections are created as PROGBITS */
 396     return new_section(s1, name, SHT_PROGBITS, SHF_ALLOC);
 397 }
 398
 399 /* update sym->c so that it points to an external symbol in section
 400    'section' with value 'value' */
 401 ST_FUNC void put_extern_sym2(Sym *sym, Section *section,
 402                             unsigned long value, unsigned long size,
 403                             int can_add_underscore)
 404 {
 405     int sym_type, sym_bind, sh_num, info, other;
 406     ElfW(Sym) *esym;
 407     const char *name;
 408     char buf1[256];
 409
 410     if (section == NULL)
 411         sh_num = SHN_UNDEF;
 412     else if (section == SECTION_ABS)
 413         sh_num = SHN_ABS;
 414     else
 415         sh_num = section->sh_num;
 416
 417     if ((sym->type.t & VT_BTYPE) == VT_FUNC) {
 418         sym_type = STT_FUNC;
 419     } else if ((sym->type.t & VT_BTYPE) == VT_VOID) {
 420         sym_type = STT_NOTYPE;
 421     } else {
 422         sym_type = STT_OBJECT;
 423     }
 424
 425     if (sym->type.t & VT_STATIC)
 426         sym_bind = STB_LOCAL;
 427     else {
 428         if (sym->type.ref && FUNC_WEAK(sym->type.ref->r))
 429             sym_bind = STB_WEAK;
 430         else
 431             sym_bind = STB_GLOBAL;
 432     }
 433
 434     if (!sym->c) {
 435         name = get_tok_str(sym->v, NULL);
 436 #ifdef CONFIG_TCC_BCHECK
 437         if (tcc_state->do_bounds_check) {
 438             char buf[32];
 439
 440             /* XXX: avoid doing that for statics ? */
 441             /* if bound checking is activated, we change some function
 442                names by adding the "__bound" prefix */
 443             switch(sym->v) {
 444 #ifdef TCC_TARGET_PE
 445             /* XXX: we rely only on malloc hooks */
 446             case TOK_malloc:
 447             case TOK_free:
 448             case TOK_realloc:
 449             case TOK_memalign:
 450             case TOK_calloc:
 451 #endif
 452             case TOK_memcpy:
 453             case TOK_memmove:
 454             case TOK_memset:
 455             case TOK_strlen:
 456             case TOK_strcpy:
 457             case TOK_alloca:
 458                 strcpy(buf, "__bound_");
 459                 strcat(buf, name);
 460                 name = buf;
 461                 break;
 462             }
 463         }
 464 #endif
 465         other = 0;
 466
 467 #ifdef TCC_TARGET_PE
 468         if (sym->type.t & VT_EXPORT)
 469             other |= 1;
 470         if (sym_type == STT_FUNC && sym->type.ref) {
 471             int attr = sym->type.ref->r;
 472             if (FUNC_EXPORT(attr))
 473                 other |= 1;
 474             if (FUNC_CALL(attr) == FUNC_STDCALL && can_add_underscore) {
 475                 sprintf(buf1, "_%s@%d", name, FUNC_ARGS(attr) * PTR_SIZE);
 476                 name = buf1;
 477                 other |= 2;
 478                 can_add_underscore = 0;
 479             }
 480         } else {
 481             if (find_elf_sym(tcc_state->dynsymtab_section, name))
 482                 other |= 4;
 483             if (sym->type.t & VT_IMPORT)
 484                 other |= 4;
 485         }
 486 #endif
 487         if (tcc_state->leading_underscore && can_add_underscore) {
 488             buf1[0] = '_';
 489             pstrcpy(buf1 + 1, sizeof(buf1) - 1, name);
 490             name = buf1;
 491         }
 492         info = ELFW(ST_INFO)(sym_bind, sym_type);
 493         sym->c = add_elf_sym(symtab_section, value, size, info, other, sh_num, name);
 494     } else {
 495         esym = &((ElfW(Sym) *)symtab_section->data)[sym->c];
 496         esym->st_value = value;
 497         esym->st_size = size;
 498         esym->st_shndx = sh_num;
 499     }
 500 }
 501
 502 ST_FUNC void put_extern_sym(Sym *sym, Section *section,
 503                            unsigned long value, unsigned long size)
 504 {
 505     put_extern_sym2(sym, section, value, size, 1);
 506 }
 507
 508 /* add a new relocation entry to symbol 'sym' in section 's' */
 509 ST_FUNC void greloc(Section *s, Sym *sym, unsigned long offset, int type)
 510 {
 511     int c = 0;
 512     if (sym) {
 513         if (0 == sym->c)
 514             put_extern_sym(sym, NULL, 0, 0);
 515         c = sym->c;
 516     }
 517     /* now we can add ELF relocation info */
 518     put_elf_reloc(symtab_section, s, offset, type, c);
 519 }
 520
 521 /********************************************************/
 522
 523 static void strcat_vprintf(char *buf, int buf_size, const char *fmt, va_list ap)
 524 {
 525     int len;
 526     len = strlen(buf);
 527     vsnprintf(buf + len, buf_size - len, fmt, ap);
 528 }
 529
 530 static void strcat_printf(char *buf, int buf_size, const char *fmt, ...)
 531 {
 532     va_list ap;
 533     va_start(ap, fmt);
 534     strcat_vprintf(buf, buf_size, fmt, ap);
 535     va_end(ap);
 536 }
 537
 538 static void error1(TCCState *s1, int is_warning, const char *fmt, va_list ap)
 539 {
 540     char buf[2048];
 541     BufferedFile **f;
 542
 543     buf[0] = '\0';
 544     if (file) {
 545         for(f = s1->include_stack; f < s1->include_stack_ptr; f++)
 546             strcat_printf(buf, sizeof(buf), "In file included from %s:%d:\n",
 547                           (*f)->filename, (*f)->line_num);
 548         if (file->line_num > 0) {
 549             strcat_printf(buf, sizeof(buf),
 550                           "%s:%d: ", file->filename, file->line_num);
 551         } else {
 552             strcat_printf(buf, sizeof(buf),
 553                           "%s: ", file->filename);
 554         }
 555     } else {
 556         strcat_printf(buf, sizeof(buf),
 557                       "tcc: ");
 558     }
 559     if (is_warning)
 560         strcat_printf(buf, sizeof(buf), "warning: ");
 561     else
 562         strcat_printf(buf, sizeof(buf), "error: ");
 563     strcat_vprintf(buf, sizeof(buf), fmt, ap);
 564
 565     if (!s1->error_func) {
 566         /* default case: stderr */
 567         fprintf(stderr, "%s\n", buf);
 568     } else {
 569         s1->error_func(s1->error_opaque, buf);
 570     }
 571     if (!is_warning || s1->warn_error)
 572         s1->nb_errors++;
 573 }
 574
 575 LIBTCCAPI void tcc_set_error_func(TCCState *s, void *error_opaque,
 576                         void (*error_func)(void *opaque, const char *msg))
 577 {
 578     s->error_opaque = error_opaque;
 579     s->error_func = error_func;
 580 }
 581
 582 /* error without aborting current compilation */
 583 PUB_FUNC void error_noabort(const char *fmt, ...)
 584 {
 585     TCCState *s1 = tcc_state;
 586     va_list ap;
 587
 588     va_start(ap, fmt);
 589     error1(s1, 0, fmt, ap);
 590     va_end(ap);
 591 }
 592
 593 PUB_FUNC void error(const char *fmt, ...)
 594 {
 595     TCCState *s1 = tcc_state;
 596     va_list ap;
 597
 598     va_start(ap, fmt);
 599     error1(s1, 0, fmt, ap);
 600     va_end(ap);
 601     /* better than nothing: in some cases, we accept to handle errors */
 602     if (s1->error_set_jmp_enabled) {
 603         longjmp(s1->error_jmp_buf, 1);
 604     } else {
 605         /* XXX: eliminate this someday */
 606         exit(1);
 607     }
 608 }
 609
 610 PUB_FUNC void expect(const char *msg)
 611 {
 612     error("%s expected", msg);
 613 }
 614
 615 PUB_FUNC void warning(const char *fmt, ...)
 616 {
 617     TCCState *s1 = tcc_state;
 618     va_list ap;
 619
 620     if (s1->warn_none)
 621         return;
 622
 623     va_start(ap, fmt);
 624     error1(s1, 1, fmt, ap);
 625     va_end(ap);
 626 }
 627
 628 /********************************************************/
 629 /* I/O layer */
 630
 631 ST_FUNC BufferedFile *tcc_open(TCCState *s1, const char *filename)
 632 {
 633     int fd;
 634     BufferedFile *bf;
 635
 636     if (strcmp(filename, "-") == 0)
 637         fd = 0, filename = "stdin";
 638     else
 639         fd = open(filename, O_RDONLY | O_BINARY);
 640     if ((s1->verbose == 2 && fd >= 0) || s1->verbose == 3)
 641         printf("%s %*s%s\n", fd < 0 ? "nf":"->",
 642                (int)(s1->include_stack_ptr - s1->include_stack), "", filename);
 643     if (fd < 0)
 644         return NULL;
 645     bf = tcc_malloc(sizeof(BufferedFile));
 646     bf->fd = fd;
 647     bf->buf_ptr = bf->buffer;
 648     bf->buf_end = bf->buffer;
 649     bf->buffer[0] = CH_EOB; /* put eob symbol */
 650     pstrcpy(bf->filename, sizeof(bf->filename), filename);
 651 #ifdef _WIN32
 652     normalize_slashes(bf->filename);
 653 #endif
 654     bf->line_num = 1;
 655     bf->ifndef_macro = 0;
 656     bf->ifdef_stack_ptr = s1->ifdef_stack_ptr;
 657     //    printf("opening '%s'\n", filename);
 658     return bf;
 659 }
 660
 661 ST_FUNC void tcc_close(BufferedFile *bf)
 662 {
 663     total_lines += bf->line_num;
 664     close(bf->fd);
 665     tcc_free(bf);
 666 }
 667
 668 /* compile the C file opened in 'file'. Return non zero if errors. */
 669 static int tcc_compile(TCCState *s1)
 670 {
 671     Sym *define_start;
 672     char buf[512];
 673     volatile int section_sym;
 674
 675 #ifdef INC_DEBUG
 676     printf("%s: **** new file\n", file->filename);
 677 #endif
 678     preprocess_init(s1);
 679
 680     cur_text_section = NULL;
 681     funcname = "";
 682     anon_sym = SYM_FIRST_ANOM;
 683
 684     /* file info: full path + filename */
 685     section_sym = 0; /* avoid warning */
 686     if (s1->do_debug) {
 687         section_sym = put_elf_sym(symtab_section, 0, 0,
 688                                   ELFW(ST_INFO)(STB_LOCAL, STT_SECTION), 0,
 689                                   text_section->sh_num, NULL);
 690         getcwd(buf, sizeof(buf));
 691 #ifdef _WIN32
 692         normalize_slashes(buf);
 693 #endif
 694         pstrcat(buf, sizeof(buf), "/");
 695         put_stabs_r(buf, N_SO, 0, 0,
 696                     text_section->data_offset, text_section, section_sym);
 697         put_stabs_r(file->filename, N_SO, 0, 0,
 698                     text_section->data_offset, text_section, section_sym);
 699     }
 700     /* an elf symbol of type STT_FILE must be put so that STB_LOCAL
 701        symbols can be safely used */
 702     put_elf_sym(symtab_section, 0, 0,
 703                 ELFW(ST_INFO)(STB_LOCAL, STT_FILE), 0,
 704                 SHN_ABS, file->filename);
 705
 706     /* define some often used types */
 707     int_type.t = VT_INT;
 708
 709     char_pointer_type.t = VT_BYTE;
 710     mk_pointer(&char_pointer_type);
 711
 712     func_old_type.t = VT_FUNC;
 713     func_old_type.ref = sym_push(SYM_FIELD, &int_type, FUNC_CDECL, FUNC_OLD);
 714
 715 #if defined(TCC_ARM_EABI) && defined(TCC_ARM_VFP)
 716     float_type.t = VT_FLOAT;
 717     double_type.t = VT_DOUBLE;
 718
 719     func_float_type.t = VT_FUNC;
 720     func_float_type.ref = sym_push(SYM_FIELD, &float_type, FUNC_CDECL, FUNC_OLD);
 721     func_double_type.t = VT_FUNC;
 722     func_double_type.ref = sym_push(SYM_FIELD, &double_type, FUNC_CDECL, FUNC_OLD);
 723 #endif
 724
 725 #if 0
 726     /* define 'void *alloca(unsigned int)' builtin function */
 727     {
 728         Sym *s1;
 729
 730         p = anon_sym++;
 731         sym = sym_push(p, mk_pointer(VT_VOID), FUNC_CDECL, FUNC_NEW);
 732         s1 = sym_push(SYM_FIELD, VT_UNSIGNED | VT_INT, 0, 0);
 733         s1->next = NULL;
 734         sym->next = s1;
 735         sym_push(TOK_alloca, VT_FUNC | (p << VT_STRUCT_SHIFT), VT_CONST, 0);
 736     }
 737 #endif
 738
 739     define_start = define_stack;
 740     nocode_wanted = 1;
 741
 742     if (setjmp(s1->error_jmp_buf) == 0) {
 743         s1->nb_errors = 0;
 744         s1->error_set_jmp_enabled = 1;
 745
 746         ch = file->buf_ptr[0];
 747         tok_flags = TOK_FLAG_BOL | TOK_FLAG_BOF;
 748         parse_flags = PARSE_FLAG_PREPROCESS | PARSE_FLAG_TOK_NUM;
 749         next();
 750         decl(VT_CONST);
 751         if (tok != TOK_EOF)
 752             expect("declaration");
 753
 754         /* end of translation unit info */
 755         if (s1->do_debug) {
 756             put_stabs_r(NULL, N_SO, 0, 0,
 757                         text_section->data_offset, text_section, section_sym);
 758         }
 759     }
 760     s1->error_set_jmp_enabled = 0;
 761
 762     /* reset define stack, but leave -Dsymbols (may be incorrect if
 763        they are undefined) */
 764     free_defines(define_start);
 765
 766     gen_inline_functions();
 767
 768     sym_pop(&global_stack, NULL);
 769     sym_pop(&local_stack, NULL);
 770
 771     return s1->nb_errors != 0 ? -1 : 0;
 772 }
 773
 774 LIBTCCAPI int tcc_compile_string(TCCState *s, const char *str)
 775 {
 776     BufferedFile bf1, *bf = &bf1;
 777     int ret, len;
 778     char *buf;
 779
 780     /* init file structure */
 781     bf->fd = -1;
 782     /* XXX: avoid copying */
 783     len = strlen(str);
 784     buf = tcc_malloc(len + 1);
 785     if (!buf)
 786         return -1;
 787     memcpy(buf, str, len);
 788     buf[len] = CH_EOB;
 789     bf->buf_ptr = buf;
 790     bf->buf_end = buf + len;
 791     pstrcpy(bf->filename, sizeof(bf->filename), "<string>");
 792     bf->line_num = 1;
 793     file = bf;
 794     ret = tcc_compile(s);
 795     file = NULL;
 796     tcc_free(buf);
 797
 798     /* currently, no need to close */
 799     return ret;
 800 }
 801
 802 /* define a preprocessor symbol. A value can also be provided with the '=' operator */
 803 LIBTCCAPI void tcc_define_symbol(TCCState *s1, const char *sym, const char *value)
 804 {
 805     BufferedFile bf1, *bf = &bf1;
 806
 807     pstrcpy(bf->buffer, IO_BUF_SIZE, sym);
 808     pstrcat(bf->buffer, IO_BUF_SIZE, " ");
 809     /* default value */
 810     if (!value)
 811         value = "1";
 812     pstrcat(bf->buffer, IO_BUF_SIZE, value);
 813
 814     /* init file structure */
 815     bf->fd = -1;
 816     bf->buf_ptr = bf->buffer;
 817     bf->buf_end = bf->buffer + strlen(bf->buffer);
 818     *bf->buf_end = CH_EOB;
 819     bf->filename[0] = '\0';
 820     bf->line_num = 1;
 821     file = bf;
 822
 823     s1->include_stack_ptr = s1->include_stack;
 824
 825     /* parse with define parser */
 826     ch = file->buf_ptr[0];
 827     next_nomacro();
 828     parse_define();
 829     file = NULL;
 830 }
 831
 832 /* undefine a preprocessor symbol */
 833 LIBTCCAPI void tcc_undefine_symbol(TCCState *s1, const char *sym)
 834 {
 835     TokenSym *ts;
 836     Sym *s;
 837     ts = tok_alloc(sym, strlen(sym));
 838     s = define_find(ts->tok);
 839     /* undefine symbol by putting an invalid name */
 840     if (s)
 841         define_undef(s);
 842 }
 843
 844 static void tcc_cleanup(void)
 845 {
 846     int i, n;
 847
 848     if (NULL == tcc_state)
 849         return;
 850     tcc_state = NULL;
 851
 852     /* free -D defines */
 853     free_defines(NULL);
 854
 855     /* free tokens */
 856     n = tok_ident - TOK_IDENT;
 857     for(i = 0; i < n; i++)
 858         tcc_free(table_ident[i]);
 859     tcc_free(table_ident);
 860
 861     /* free sym_pools */
 862     dynarray_reset(&sym_pools, &nb_sym_pools);
 863     /* string buffer */
 864     cstr_free(&tokcstr);
 865     /* reset symbol stack */
 866     sym_free_first = NULL;
 867     /* cleanup from error/setjmp */
 868     macro_ptr = NULL;
 869 }
 870
 871 LIBTCCAPI TCCState *tcc_new(void)
 872 {
 873     TCCState *s;
 874     char buffer[100];
 875     int a,b,c;
 876
 877     tcc_cleanup();
 878
 879     s = tcc_mallocz(sizeof(TCCState));
 880     if (!s)
 881         return NULL;
 882     tcc_state = s;
 883 #ifdef _WIN32
 884     tcc_set_lib_path_w32(s);
 885 #else
 886     tcc_set_lib_path(s, CONFIG_TCCDIR);
 887 #endif
 888     s->output_type = TCC_OUTPUT_MEMORY;
 889     preprocess_new();
 890
 891     /* we add dummy defines for some special macros to speed up tests
 892        and to have working defined() */
 893     define_push(TOK___LINE__, MACRO_OBJ, NULL, NULL);
 894     define_push(TOK___FILE__, MACRO_OBJ, NULL, NULL);
 895     define_push(TOK___DATE__, MACRO_OBJ, NULL, NULL);
 896     define_push(TOK___TIME__, MACRO_OBJ, NULL, NULL);
 897
 898     /* standard defines */
 899     tcc_define_symbol(s, "__STDC__", NULL);
 900     tcc_define_symbol(s, "__STDC_VERSION__", "199901L");
 901 #if defined(TCC_TARGET_I386)
 902     tcc_define_symbol(s, "__i386__", NULL);
 903     tcc_define_symbol(s, "__i386", NULL);
 904     tcc_define_symbol(s, "i386", NULL);
 905 #endif
 906 #if defined(TCC_TARGET_X86_64)
 907     tcc_define_symbol(s, "__x86_64__", NULL);
 908 #endif
 909 #if defined(TCC_TARGET_ARM)
 910     tcc_define_symbol(s, "__ARM_ARCH_4__", NULL);
 911     tcc_define_symbol(s, "__arm_elf__", NULL);
 912     tcc_define_symbol(s, "__arm_elf", NULL);
 913     tcc_define_symbol(s, "arm_elf", NULL);
 914     tcc_define_symbol(s, "__arm__", NULL);
 915     tcc_define_symbol(s, "__arm", NULL);
 916     tcc_define_symbol(s, "arm", NULL);
 917     tcc_define_symbol(s, "__APCS_32__", NULL);
 918 #endif
 919 #ifdef TCC_TARGET_PE
 920     tcc_define_symbol(s, "_WIN32", NULL);
 921 #ifdef TCC_TARGET_X86_64
 922     tcc_define_symbol(s, "_WIN64", NULL);
 923 #endif
 924 #else
 925     tcc_define_symbol(s, "__unix__", NULL);
 926     tcc_define_symbol(s, "__unix", NULL);
 927     tcc_define_symbol(s, "unix", NULL);
 928 #if defined(__FreeBSD__)
 929 #define str(s) #s
 930     tcc_define_symbol(s, "__FreeBSD__", str( __FreeBSD__));
 931 #undef str
 932 #endif
 933 #if defined(__linux)
 934     tcc_define_symbol(s, "__linux__", NULL);
 935     tcc_define_symbol(s, "__linux", NULL);
 936 #endif
 937 #endif
 938     /* tiny C specific defines */
 939     sscanf(TCC_VERSION, "%d.%d.%d", &a, &b, &c);
 940     sprintf(buffer, "%d", a*10000 + b*100 + c);
 941     tcc_define_symbol(s, "__TINYC__", buffer);
 942
 943     /* tiny C & gcc defines */
 944 #if defined TCC_TARGET_PE && defined TCC_TARGET_X86_64
 945     tcc_define_symbol(s, "__SIZE_TYPE__", "unsigned long long");
 946     tcc_define_symbol(s, "__PTRDIFF_TYPE__", "long long");
 947 #else
 948     tcc_define_symbol(s, "__SIZE_TYPE__", "unsigned long");
 949     tcc_define_symbol(s, "__PTRDIFF_TYPE__", "long");
 950 #endif
 951
 952 #ifdef TCC_TARGET_PE
 953     tcc_define_symbol(s, "__WCHAR_TYPE__", "unsigned short");
 954 #else
 955     tcc_define_symbol(s, "__WCHAR_TYPE__", "int");
 956 #endif
 957
 958 #ifndef TCC_TARGET_PE
 959     /* default library paths */
 960 # if defined(TCC_TARGET_X86_64_CENTOS)
 961     tcc_add_library_path(s, CONFIG_SYSROOT "/usr/lib64");
 962     tcc_add_library_path(s, CONFIG_SYSROOT "/lib64");
 963     tcc_add_library_path(s, CONFIG_SYSROOT "/usr/local/lib64");
 964 # else
 965     tcc_add_library_path(s, CONFIG_SYSROOT "/usr/lib");
 966     tcc_add_library_path(s, CONFIG_SYSROOT "/lib");
 967     tcc_add_library_path(s, CONFIG_SYSROOT "/usr/local/lib");
 968 # endif
 969 #endif
 970
 971     /* no section zero */
 972     dynarray_add((void ***)&s->sections, &s->nb_sections, NULL);
 973
 974     /* create standard sections */
 975     text_section = new_section(s, ".text", SHT_PROGBITS, SHF_ALLOC | SHF_EXECINSTR);
 976     data_section = new_section(s, ".data", SHT_PROGBITS, SHF_ALLOC | SHF_WRITE);
 977     bss_section = new_section(s, ".bss", SHT_NOBITS, SHF_ALLOC | SHF_WRITE);
 978
 979     /* symbols are always generated for linking stage */
 980     symtab_section = new_symtab(s, ".symtab", SHT_SYMTAB, 0,
 981                                 ".strtab",
 982                                 ".hashtab", SHF_PRIVATE);
 983     strtab_section = symtab_section->link;
 984
 985     /* private symbol table for dynamic symbols */
 986     s->dynsymtab_section = new_symtab(s, ".dynsymtab", SHT_SYMTAB, SHF_PRIVATE,
 987                                       ".dynstrtab",
 988                                       ".dynhashtab", SHF_PRIVATE);
 989     s->alacarte_link = 1;
 990     s->nocommon = 1;
 991
 992 #ifdef CHAR_IS_UNSIGNED
 993     s->char_is_unsigned = 1;
 994 #endif
 995 #if defined(TCC_TARGET_PE) && 0
 996     /* XXX: currently the PE linker is not ready to support that */
 997     s->leading_underscore = 1;
 998 #endif
 999     if (s->section_align == 0)
1000         s->section_align = ELF_PAGE_SIZE;
1001 #ifdef TCC_TARGET_I386
1002     s->seg_size = 32;
1003 #endif
1004     return s;
1005 }
1006
1007 LIBTCCAPI void tcc_delete(TCCState *s1)
1008 {
1009     int i;
1010
1011     tcc_cleanup();
1012
1013     /* free all sections */
1014     for(i = 1; i < s1->nb_sections; i++)
1015         free_section(s1->sections[i]);
1016     dynarray_reset(&s1->sections, &s1->nb_sections);
1017
1018     for(i = 0; i < s1->nb_priv_sections; i++)
1019         free_section(s1->priv_sections[i]);
1020     dynarray_reset(&s1->priv_sections, &s1->nb_priv_sections);
1021
1022     /* free any loaded DLLs */
1023     for ( i = 0; i < s1->nb_loaded_dlls; i++) {
1024         DLLReference *ref = s1->loaded_dlls[i];
1025         if ( ref->handle )
1026             dlclose(ref->handle);
1027     }
1028
1029     /* free loaded dlls array */
1030     dynarray_reset(&s1->loaded_dlls, &s1->nb_loaded_dlls);
1031
1032     /* free library paths */
1033     dynarray_reset(&s1->library_paths, &s1->nb_library_paths);
1034
1035     /* free include paths */
1036     dynarray_reset(&s1->cached_includes, &s1->nb_cached_includes);
1037     dynarray_reset(&s1->include_paths, &s1->nb_include_paths);
1038     dynarray_reset(&s1->sysinclude_paths, &s1->nb_sysinclude_paths);
1039
1040     tcc_free(s1->tcc_lib_path);
1041     tcc_free(s1->runtime_mem);
1042     tcc_free(s1);
1043 }
1044
1045 LIBTCCAPI int tcc_add_include_path(TCCState *s1, const char *pathname)
1046 {
1047     char *pathname1;
1048
1049     pathname1 = tcc_strdup(pathname);
1050     dynarray_add((void ***)&s1->include_paths, &s1->nb_include_paths, pathname1);
1051     return 0;
1052 }
1053
1054 LIBTCCAPI int tcc_add_sysinclude_path(TCCState *s1, const char *pathname)
1055 {
1056     char *pathname1;
1057
1058     pathname1 = tcc_strdup(pathname);
1059     dynarray_add((void ***)&s1->sysinclude_paths, &s1->nb_sysinclude_paths, pathname1);
1060     return 0;
1061 }
1062
1063 static int tcc_add_file_internal(TCCState *s1, const char *filename, int flags)
1064 {
1065     const char *ext;
1066     ElfW(Ehdr) ehdr;
1067     int fd, ret, size;
1068     BufferedFile *saved_file;
1069
1070     ret = -1;
1071
1072     /* find source file type with extension */
1073     ext = tcc_fileextension(filename);
1074     if (ext[0])
1075         ext++;
1076
1077     /* open the file */
1078     saved_file = file;
1079     file = tcc_open(s1, filename);
1080     if (!file) {
1081         if (flags & AFF_PRINT_ERROR)
1082             error_noabort("file '%s' not found", filename);
1083         goto the_end;
1084     }
1085
1086     if (flags & AFF_PREPROCESS) {
1087         ret = tcc_preprocess(s1);
1088         goto the_end;
1089     }
1090
1091     if (!ext[0] || !PATHCMP(ext, "c")) {
1092         /* C file assumed */
1093         ret = tcc_compile(s1);
1094         goto the_end;
1095     }
1096
1097 #ifdef CONFIG_TCC_ASM
1098     if (!strcmp(ext, "S")) {
1099         /* preprocessed assembler */
1100         ret = tcc_assemble(s1, 1);
1101         goto the_end;
1102     }
1103
1104     if (!strcmp(ext, "s")) {
1105         /* non preprocessed assembler */
1106         ret = tcc_assemble(s1, 0);
1107         goto the_end;
1108     }
1109 #endif
1110
1111     fd = file->fd;
1112     /* assume executable format: auto guess file type */
1113     size = read(fd, &ehdr, sizeof(ehdr));
1114     lseek(fd, 0, SEEK_SET);
1115     if (size <= 0) {
1116         error_noabort("could not read header");
1117         goto the_end;
1118     }
1119
1120     if (size == sizeof(ehdr) &&
1121         ehdr.e_ident[0] == ELFMAG0 &&
1122         ehdr.e_ident[1] == ELFMAG1 &&
1123         ehdr.e_ident[2] == ELFMAG2 &&
1124         ehdr.e_ident[3] == ELFMAG3) {
1125
1126         /* do not display line number if error */
1127         file->line_num = 0;
1128         if (ehdr.e_type == ET_REL) {
1129             ret = tcc_load_object_file(s1, fd, 0);
1130             goto the_end;
1131
1132         }
1133 #ifndef TCC_TARGET_PE
1134         if (ehdr.e_type == ET_DYN) {
1135             if (s1->output_type == TCC_OUTPUT_MEMORY) {
1136                 void *h;
1137                 h = dlopen(filename, RTLD_GLOBAL | RTLD_LAZY);
1138                 if (h)
1139                     ret = 0;
1140             } else {
1141                 ret = tcc_load_dll(s1, fd, filename,
1142                                    (flags & AFF_REFERENCED_DLL) != 0);
1143             }
1144             goto the_end;
1145         }
1146 #endif
1147         error_noabort("unrecognized ELF file");
1148         goto the_end;
1149     }
1150
1151     if (memcmp((char *)&ehdr, ARMAG, 8) == 0) {
1152         file->line_num = 0; /* do not display line number if error */
1153         ret = tcc_load_archive(s1, fd);
1154         goto the_end;
1155     }
1156
1157 #ifdef TCC_TARGET_COFF
1158     if (*(uint16_t *)(&ehdr) == COFF_C67_MAGIC) {
1159         ret = tcc_load_coff(s1, fd);
1160         goto the_end;
1161     }
1162 #endif
1163
1164 #ifdef TCC_TARGET_PE
1165     ret = pe_load_file(s1, filename, fd);
1166 #else
1167     /* as GNU ld, consider it is an ld script if not recognized */
1168     ret = tcc_load_ldscript(s1);
1169 #endif
1170     if (ret < 0)
1171         error_noabort("unrecognized file type");
1172
1173 the_end:
1174     if (file)
1175         tcc_close(file);
1176     file = saved_file;
1177     return ret;
1178 }
1179
1180 LIBTCCAPI int tcc_add_file(TCCState *s, const char *filename)
1181 {
1182     if (s->output_type == TCC_OUTPUT_PREPROCESS)
1183         return tcc_add_file_internal(s, filename, AFF_PRINT_ERROR | AFF_PREPROCESS);
1184     else
1185         return tcc_add_file_internal(s, filename, AFF_PRINT_ERROR);
1186 }
1187
1188 LIBTCCAPI int tcc_add_library_path(TCCState *s, const char *pathname)
1189 {
1190     char *pathname1;
1191
1192     pathname1 = tcc_strdup(pathname);
1193     dynarray_add((void ***)&s->library_paths, &s->nb_library_paths, pathname1);
1194     return 0;
1195 }
1196
1197 /* find and load a dll. Return non zero if not found */
1198 /* XXX: add '-rpath' option support ? */
1199 ST_FUNC int tcc_add_dll(TCCState *s, const char *filename, int flags)
1200 {
1201     char buf[1024];
1202     int i;
1203
1204     for(i = 0; i < s->nb_library_paths; i++) {
1205         snprintf(buf, sizeof(buf), "%s/%s",
1206                  s->library_paths[i], filename);
1207         if (tcc_add_file_internal(s, buf, flags) == 0)
1208             return 0;
1209     }
1210     return -1;
1211 }
1212
1213 /* the library name is the same as the argument of the '-l' option */
1214 LIBTCCAPI int tcc_add_library(TCCState *s, const char *libraryname)
1215 {
1216     char buf[1024];
1217     int i;
1218
1219     /* first we look for the dynamic library if not static linking */
1220     if (!s->static_link) {
1221 #ifdef TCC_TARGET_PE
1222         if (pe_add_dll(s, libraryname) == 0)
1223             return 0;
1224 #else
1225         snprintf(buf, sizeof(buf), "lib%s.so", libraryname);
1226         if (tcc_add_dll(s, buf, 0) == 0)
1227             return 0;
1228 #endif
1229     }
1230     /* then we look for the static library */
1231     for(i = 0; i < s->nb_library_paths; i++) {
1232         snprintf(buf, sizeof(buf), "%s/lib%s.a",
1233                  s->library_paths[i], libraryname);
1234         if (tcc_add_file_internal(s, buf, 0) == 0)
1235             return 0;
1236     }
1237     return -1;
1238 }
1239
1240 LIBTCCAPI int tcc_add_symbol(TCCState *s, const char *name, const void *val)
1241 {
1242 #ifdef TCC_TARGET_PE
1243     pe_putimport(s, 0, name, val);
1244 #else
1245     add_elf_sym(symtab_section, (uplong)val, 0,
1246                 ELFW(ST_INFO)(STB_GLOBAL, STT_NOTYPE), 0,
1247                 SHN_ABS, name);
1248 #endif
1249     return 0;
1250 }
1251
1252 LIBTCCAPI int tcc_set_output_type(TCCState *s, int output_type)
1253 {
1254     char buf[1024];
1255
1256     s->output_type = output_type;
1257
1258     if (!s->nostdinc) {
1259         /* default include paths */
1260         /* XXX: reverse order needed if -isystem support */
1261 #ifndef TCC_TARGET_PE
1262         tcc_add_sysinclude_path(s, CONFIG_SYSROOT "/usr/local/include");
1263         tcc_add_sysinclude_path(s, CONFIG_SYSROOT "/usr/include");
1264 #endif
1265         snprintf(buf, sizeof(buf), "%s/include", s->tcc_lib_path);
1266         tcc_add_sysinclude_path(s, buf);
1267 #ifdef TCC_TARGET_PE
1268         snprintf(buf, sizeof(buf), "%s/include/winapi", s->tcc_lib_path);
1269         tcc_add_sysinclude_path(s, buf);
1270 #endif
1271     }
1272
1273     /* if bound checking, then add corresponding sections */
1274 #ifdef CONFIG_TCC_BCHECK
1275     if (s->do_bounds_check) {
1276         /* define symbol */
1277         tcc_define_symbol(s, "__BOUNDS_CHECKING_ON", NULL);
1278         /* create bounds sections */
1279         bounds_section = new_section(s, ".bounds",
1280                                      SHT_PROGBITS, SHF_ALLOC);
1281         lbounds_section = new_section(s, ".lbounds",
1282                                       SHT_PROGBITS, SHF_ALLOC);
1283     }
1284 #endif
1285
1286     if (s->char_is_unsigned) {
1287         tcc_define_symbol(s, "__CHAR_UNSIGNED__", NULL);
1288     }
1289
1290     /* add debug sections */
1291     if (s->do_debug) {
1292         /* stab symbols */
1293         stab_section = new_section(s, ".stab", SHT_PROGBITS, 0);
1294         stab_section->sh_entsize = sizeof(Stab_Sym);
1295         stabstr_section = new_section(s, ".stabstr", SHT_STRTAB, 0);
1296         put_elf_str(stabstr_section, "");
1297         stab_section->link = stabstr_section;
1298         /* put first entry */
1299         put_stabs("", 0, 0, 0, 0);
1300     }
1301
1302     /* add libc crt1/crti objects */
1303 #ifndef TCC_TARGET_PE
1304     if ((output_type == TCC_OUTPUT_EXE || output_type == TCC_OUTPUT_DLL) &&
1305         !s->nostdlib) {
1306         if (output_type != TCC_OUTPUT_DLL)
1307             tcc_add_file(s, CONFIG_TCC_CRT_PREFIX "/crt1.o");
1308         tcc_add_file(s, CONFIG_TCC_CRT_PREFIX "/crti.o");
1309     }
1310 #endif
1311
1312 #ifdef TCC_TARGET_PE
1313     snprintf(buf, sizeof(buf), "%s/lib", s->tcc_lib_path);
1314     tcc_add_library_path(s, buf);
1315 #ifdef _WIN32
1316     if (GetSystemDirectory(buf, sizeof buf))
1317         tcc_add_library_path(s, buf);
1318 #endif
1319 #endif
1320
1321     return 0;
1322 }
1323
1324 #define WD_ALL    0x0001 /* warning is activated when using -Wall */
1325 #define FD_INVERT 0x0002 /* invert value before storing */
1326
1327 typedef struct FlagDef {
1328     uint16_t offset;
1329     uint16_t flags;
1330     const char *name;
1331 } FlagDef;
1332
1333 static const FlagDef warning_defs[] = {
1334     { offsetof(TCCState, warn_unsupported), 0, "unsupported" },
1335     { offsetof(TCCState, warn_write_strings), 0, "write-strings" },
1336     { offsetof(TCCState, warn_error), 0, "error" },
1337     { offsetof(TCCState, warn_implicit_function_declaration), WD_ALL,
1338       "implicit-function-declaration" },
1339 };
1340
1341 ST_FUNC int set_flag(TCCState *s, const FlagDef *flags, int nb_flags,
1342                     const char *name, int value)
1343 {
1344     int i;
1345     const FlagDef *p;
1346     const char *r;
1347
1348     r = name;
1349     if (r[0] == 'n' && r[1] == 'o' && r[2] == '-') {
1350         r += 3;
1351         value = !value;
1352     }
1353     for(i = 0, p = flags; i < nb_flags; i++, p++) {
1354         if (!strcmp(r, p->name))
1355             goto found;
1356     }
1357     return -1;
1358  found:
1359     if (p->flags & FD_INVERT)
1360         value = !value;
1361     *(int *)((uint8_t *)s + p->offset) = value;
1362     return 0;
1363 }
1364
1365 /* set/reset a warning */
1366 LIBTCCAPI int tcc_set_warning(TCCState *s, const char *warning_name, int value)
1367 {
1368     int i;
1369     const FlagDef *p;
1370
1371     if (!strcmp(warning_name, "all")) {
1372         for(i = 0, p = warning_defs; i < countof(warning_defs); i++, p++) {
1373             if (p->flags & WD_ALL)
1374                 *(int *)((uint8_t *)s + p->offset) = 1;
1375         }
1376         return 0;
1377     } else {
1378         return set_flag(s, warning_defs, countof(warning_defs),
1379                         warning_name, value);
1380     }
1381 }
1382
1383 static const FlagDef flag_defs[] = {
1384     { offsetof(TCCState, char_is_unsigned), 0, "unsigned-char" },
1385     { offsetof(TCCState, char_is_unsigned), FD_INVERT, "signed-char" },
1386     { offsetof(TCCState, nocommon), FD_INVERT, "common" },
1387     { offsetof(TCCState, leading_underscore), 0, "leading-underscore" },
1388 };
1389
1390 /* set/reset a flag */
1391 PUB_FUNC int tcc_set_flag(TCCState *s, const char *flag_name, int value)
1392 {
1393     return set_flag(s, flag_defs, countof(flag_defs),
1394                     flag_name, value);
1395 }
1396
1397
1398 static int strstart(const char *str, const char *val, char **ptr)
1399 {
1400     const char *p, *q;
1401     p = str;
1402     q = val;
1403     while (*q != '\0') {
1404         if (*p != *q)
1405             return 0;
1406         p++;
1407         q++;
1408     }
1409     if (ptr)
1410         *ptr = (char *) p;
1411     return 1;
1412 }
1413
1414 /* set linker options */
1415 PUB_FUNC const char * tcc_set_linker(TCCState *s, char *option, int multi)
1416 {
1417     char *p = option;
1418     char *end;
1419
1420     while (option && *option) {
1421         end = NULL;
1422         if (strstart(option, "-Bsymbolic", &p)) {
1423             s->symbolic = TRUE;
1424 #ifdef TCC_TARGET_PE
1425         } else if (strstart(option, "--file-alignment,", &p)) {
1426             s->pe_file_align = strtoul(p, &end, 16);
1427 #endif
1428         } else if (strstart(option, "-fini,", &p)) {
1429             s->fini_symbol = p;
1430             if (s->warn_unsupported)
1431                 warning("ignoring -fini %s", p);
1432
1433         } else if (strstart(option, "--image-base,", &p)) {
1434             s->text_addr = strtoul(p, &end, 16);
1435             s->has_text_addr = 1;
1436         } else if (strstart(option, "-init,", &p)) {
1437             s->init_symbol = p;
1438             if (s->warn_unsupported)
1439                 warning("ignoring -init %s", p);
1440
1441         } else if (strstart(option, "--oformat,", &p)) {
1442 #if defined(TCC_TARGET_PE)
1443             if (strstart(p, "pe-", NULL)) {
1444 #else
1445 #if defined(TCC_TARGET_X86_64)
1446             if (strstart(p, "elf64-", NULL)) {
1447 #else
1448             if (strstart(p, "elf32-", NULL)) {
1449 #endif
1450 #endif
1451                 s->output_format = TCC_OUTPUT_FORMAT_ELF;
1452             } else if (!strcmp(p, "binary")) {
1453                 s->output_format = TCC_OUTPUT_FORMAT_BINARY;
1454             } else
1455 #ifdef TCC_TARGET_COFF
1456             if (!strcmp(p, "coff")) {
1457                 s->output_format = TCC_OUTPUT_FORMAT_COFF;
1458             } else
1459 #endif
1460             {
1461                 return p;
1462             }
1463
1464         } else if (strstart(option, "-rpath=", &p)) {
1465             s->rpath = p;
1466         } else if (strstart(option, "--section-alignment,", &p)) {
1467             s->section_align = strtoul(p, &end, 16);
1468         } else if (strstart(option, "-soname,", &p)) {
1469             s->soname = p;
1470             multi = 0;
1471 #ifdef TCC_TARGET_PE
1472         } else if (strstart(option, "--subsystem,", &p)) {
1473 #if defined(TCC_TARGET_I386) || defined(TCC_TARGET_X86_64)
1474             if (!strcmp(p, "native")) {
1475                 s->pe_subsystem = 1;
1476             } else if (!strcmp(p, "console")) {
1477                 s->pe_subsystem = 3;
1478             } else if (!strcmp(p, "gui")) {
1479                 s->pe_subsystem = 2;
1480             } else if (!strcmp(p, "posix")) {
1481                 s->pe_subsystem = 7;
1482             } else if (!strcmp(p, "efiapp")) {
1483                 s->pe_subsystem = 10;
1484             } else if (!strcmp(p, "efiboot")) {
1485                 s->pe_subsystem = 11;
1486             } else if (!strcmp(p, "efiruntime")) {
1487                 s->pe_subsystem = 12;
1488             } else if (!strcmp(p, "efirom")) {
1489                 s->pe_subsystem = 13;
1490 #elif defined(TCC_TARGET_ARM)
1491             if (!strcmp(p, "wince")) {
1492                 s->pe_subsystem = 9;
1493 #endif
1494             } else {
1495                 return p;
1496             }
1497 #endif
1498
1499         } else if (strstart(option, "-Ttext,", &p)) {
1500             s->text_addr = strtoul(p, &end, 16);
1501             s->has_text_addr = 1;
1502
1503         } else {
1504             return option;
1505         }
1506
1507         if (multi) {
1508             option = NULL;
1509             p = strchr( (end) ? end : p, ',');
1510             if (p) {
1511                 *p = 0;    /* terminate last option */
1512                 option = ++p;
1513             }
1514         } else
1515             option = NULL;
1516     }
1517     return NULL;
1518 }
1519
1520 PUB_FUNC void tcc_print_stats(TCCState *s, int64_t total_time)
1521 {
1522     double tt;
1523     tt = (double)total_time / 1000000.0;
1524     if (tt < 0.001)
1525         tt = 0.001;
1526     if (total_bytes < 1)
1527         total_bytes = 1;
1528     printf("%d idents, %d lines, %d bytes, %0.3f s, %d lines/s, %0.1f MB/s\n",
1529            tok_ident - TOK_IDENT, total_lines, total_bytes,
1530            tt, (int)(total_lines / tt),
1531            total_bytes / tt / 1000000.0);
1532 }
1533
1534 /* set CONFIG_TCCDIR at runtime */
1535 LIBTCCAPI void tcc_set_lib_path(TCCState *s, const char *path)
1536 {
1537     tcc_free(s->tcc_lib_path);
1538     s->tcc_lib_path = tcc_strdup(path);
1539 }
1540
1541 PUB_FUNC void set_num_callers(int n)
1542 {
1543 #ifdef CONFIG_TCC_BACKTRACE
1544     num_callers = n;
1545 #endif
1546 }