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 /* parser */
  24 static struct BufferedFile *file;
  25 static int ch, tok;
  26 static CValue tokc;
  27 static CString tokcstr; /* current parsed string, if any */
  28 /* additional informations about token */
  29 static int tok_flags;
  30 #define TOK_FLAG_BOL   0x0001 /* beginning of line before */
  31 #define TOK_FLAG_BOF   0x0002 /* beginning of file before */
  32 #define TOK_FLAG_ENDIF 0x0004 /* a endif was found matching starting #ifdef */
  33 #define TOK_FLAG_EOF   0x0008 /* end of file */
  34
  35 static int *macro_ptr, *macro_ptr_allocated;
  36 static int *unget_saved_macro_ptr;
  37 static int unget_saved_buffer[TOK_MAX_SIZE + 1];
  38 static int unget_buffer_enabled;
  39 static int parse_flags;
  40 #define PARSE_FLAG_PREPROCESS 0x0001 /* activate preprocessing */
  41 #define PARSE_FLAG_TOK_NUM    0x0002 /* return numbers instead of TOK_PPNUM */
  42 #define PARSE_FLAG_LINEFEED   0x0004 /* line feed is returned as a
  43                                         token. line feed is also
  44                                         returned at eof */
  45 #define PARSE_FLAG_ASM_COMMENTS 0x0008 /* '#' can be used for line comment */
  46 #define PARSE_FLAG_SPACES     0x0010 /* next() returns space tokens (for -E) */
  47
  48 static Section *text_section, *data_section, *bss_section; /* predefined sections */
  49 static Section *cur_text_section; /* current section where function code is
  50                               generated */
  51 #ifdef CONFIG_TCC_ASM
  52 static Section *last_text_section; /* to handle .previous asm directive */
  53 #endif
  54 /* bound check related sections */
  55 static Section *bounds_section; /* contains global data bound description */
  56 static Section *lbounds_section; /* contains local data bound description */
  57 /* symbol sections */
  58 static Section *symtab_section, *strtab_section;
  59
  60 /* debug sections */
  61 static Section *stab_section, *stabstr_section;
  62
  63 /* loc : local variable index
  64    ind : output code index
  65    rsym: return symbol
  66    anon_sym: anonymous symbol index
  67 */
  68 static int rsym, anon_sym, ind, loc;
  69 /* expression generation modifiers */
  70 static int const_wanted; /* true if constant wanted */
  71 static int nocode_wanted; /* true if no code generation wanted for an expression */
  72 static int global_expr;  /* true if compound literals must be allocated
  73                             globally (used during initializers parsing */
  74 static CType func_vt; /* current function return type (used by return
  75                          instruction) */
  76 static int func_vc;
  77 static int last_line_num, last_ind, func_ind; /* debug last line number and pc */
  78 static int tok_ident;
  79 static TokenSym **table_ident;
  80 static TokenSym *hash_ident[TOK_HASH_SIZE];
  81 static char token_buf[STRING_MAX_SIZE + 1];
  82 static char *funcname;
  83 static Sym *global_stack, *local_stack;
  84 static Sym *define_stack;
  85 static Sym *global_label_stack, *local_label_stack;
  86 /* symbol allocator */
  87 #define SYM_POOL_NB (8192 / sizeof(Sym))
  88 static Sym *sym_free_first;
  89 static void **sym_pools;
  90 static int nb_sym_pools;
  91
  92 static SValue vstack[VSTACK_SIZE], *vtop;
  93 /* some predefined types */
  94 static CType char_pointer_type, func_old_type, int_type;
  95
  96 /* display some information during compilation */
  97 static int verbose = 0;
  98
  99 /* compile with debug symbol (and use them if error during execution) */
 100 static int do_debug = 0;
 101
 102 /* compile with built-in memory and bounds checker */
 103 static int do_bounds_check = 0;
 104
 105 /* display benchmark infos */
 106 static int total_lines;
 107 static int total_bytes;
 108
 109 /* use GNU C extensions */
 110 static int gnu_ext = 1;
 111
 112 /* use Tiny C extensions */
 113 static int tcc_ext = 1;
 114
 115 /* max number of callers shown if error */
 116 #ifdef CONFIG_TCC_BACKTRACE
 117 static int num_callers = 6;
 118 static const char **rt_bound_error_msg;
 119 #endif
 120
 121 /* XXX: get rid of this ASAP */
 122 static struct TCCState *tcc_state;
 123
 124 /* give the path of the tcc libraries */
 125 static const char *tcc_lib_path = CONFIG_TCCDIR;
 126
 127
 128 #ifdef TCC_TARGET_I386
 129 #include "i386-gen.c"
 130 #endif
 131
 132 #ifdef TCC_TARGET_ARM
 133 #include "arm-gen.c"
 134 #endif
 135
 136 #ifdef TCC_TARGET_C67
 137 #include "c67-gen.c"
 138 #endif
 139
 140 #ifdef TCC_TARGET_X86_64
 141 #include "x86_64-gen.c"
 142 #endif
 143
 144 #ifdef CONFIG_TCC_STATIC
 145
 146 #define RTLD_LAZY       0x001
 147 #define RTLD_NOW        0x002
 148 #define RTLD_GLOBAL     0x100
 149 #define RTLD_DEFAULT    NULL
 150
 151 /* dummy function for profiling */
 152 void *dlopen(const char *filename, int flag)
 153 {
 154     return NULL;
 155 }
 156
 157 void dlclose(void *p)
 158 {
 159 }
 160
 161 const char *dlerror(void)
 162 {
 163     return "error";
 164 }
 165
 166 typedef struct TCCSyms {
 167     char *str;
 168     void *ptr;
 169 } TCCSyms;
 170
 171 #define TCCSYM(a) { #a, &a, },
 172
 173 /* add the symbol you want here if no dynamic linking is done */
 174 static TCCSyms tcc_syms[] = {
 175 #if !defined(CONFIG_TCCBOOT)
 176     TCCSYM(printf)
 177     TCCSYM(fprintf)
 178     TCCSYM(fopen)
 179     TCCSYM(fclose)
 180 #endif
 181     { NULL, NULL },
 182 };
 183
 184 void *resolve_sym(TCCState *s1, const char *symbol, int type)
 185 {
 186     TCCSyms *p;
 187     p = tcc_syms;
 188     while (p->str != NULL) {
 189         if (!strcmp(p->str, symbol))
 190             return p->ptr;
 191         p++;
 192     }
 193     return NULL;
 194 }
 195
 196 #elif !defined(_WIN32)
 197
 198 #include <dlfcn.h>
 199
 200 void *resolve_sym(TCCState *s1, const char *sym, int type)
 201 {
 202     return dlsym(RTLD_DEFAULT, sym);
 203 }
 204
 205 #endif
 206
 207 /********************************************************/
 208
 209 /* we use our own 'finite' function to avoid potential problems with
 210    non standard math libs */
 211 /* XXX: endianness dependent */
 212 int ieee_finite(double d)
 213 {
 214     int *p = (int *)&d;
 215     return ((unsigned)((p[1] | 0x800fffff) + 1)) >> 31;
 216 }
 217
 218 /* copy a string and truncate it. */
 219 static char *pstrcpy(char *buf, int buf_size, const char *s)
 220 {
 221     char *q, *q_end;
 222     int c;
 223
 224     if (buf_size > 0) {
 225         q = buf;
 226         q_end = buf + buf_size - 1;
 227         while (q < q_end) {
 228             c = *s++;
 229             if (c == '\0')
 230                 break;
 231             *q++ = c;
 232         }
 233         *q = '\0';
 234     }
 235     return buf;
 236 }
 237
 238 /* strcat and truncate. */
 239 static char *pstrcat(char *buf, int buf_size, const char *s)
 240 {
 241     int len;
 242     len = strlen(buf);
 243     if (len < buf_size)
 244         pstrcpy(buf + len, buf_size - len, s);
 245     return buf;
 246 }
 247
 248 /* extract the basename of a file */
 249 static char *tcc_basename(const char *name)
 250 {
 251     char *p = strchr(name, 0);
 252     while (p > name && !IS_PATHSEP(p[-1]))
 253         --p;
 254     return p;
 255 }
 256
 257 static char *tcc_fileextension (const char *name)
 258 {
 259     char *b = tcc_basename(name);
 260     char *e = strrchr(b, '.');
 261     return e ? e : strchr(b, 0);
 262 }
 263
 264 #ifdef _WIN32
 265 char *normalize_slashes(char *path)
 266 {
 267     char *p;
 268     for (p = path; *p; ++p)
 269         if (*p == '\\')
 270             *p = '/';
 271     return path;
 272 }
 273
 274 void tcc_set_lib_path_w32(TCCState *s)
 275 {
 276     /* on win32, we suppose the lib and includes are at the location
 277        of 'tcc.exe' */
 278     char path[1024], *p;
 279     GetModuleFileNameA(NULL, path, sizeof path);
 280     p = tcc_basename(normalize_slashes(strlwr(path)));
 281     if (p - 5 > path && 0 == strncmp(p - 5, "/bin/", 5))
 282         p -= 5;
 283     else if (p > path)
 284         p--;
 285     *p = 0;
 286     tcc_set_lib_path(s, path);
 287 }
 288 #endif
 289
 290 void set_pages_executable(void *ptr, unsigned long length)
 291 {
 292 #ifdef _WIN32
 293     unsigned long old_protect;
 294     VirtualProtect(ptr, length, PAGE_EXECUTE_READWRITE, &old_protect);
 295 #else
 296     unsigned long start, end;
 297     start = (unsigned long)ptr & ~(PAGESIZE - 1);
 298     end = (unsigned long)ptr + length;
 299     end = (end + PAGESIZE - 1) & ~(PAGESIZE - 1);
 300     mprotect((void *)start, end - start, PROT_READ | PROT_WRITE | PROT_EXEC);
 301 #endif
 302 }
 303
 304 /* memory management */
 305 #ifdef MEM_DEBUG
 306 int mem_cur_size;
 307 int mem_max_size;
 308 unsigned malloc_usable_size(void*);
 309 #endif
 310
 311 static inline void tcc_free(void *ptr)
 312 {
 313 #ifdef MEM_DEBUG
 314     mem_cur_size -= malloc_usable_size(ptr);
 315 #endif
 316     free(ptr);
 317 }
 318
 319 static void *tcc_malloc(unsigned long size)
 320 {
 321     void *ptr;
 322     ptr = malloc(size);
 323     if (!ptr && size)
 324         error("memory full");
 325 #ifdef MEM_DEBUG
 326     mem_cur_size += malloc_usable_size(ptr);
 327     if (mem_cur_size > mem_max_size)
 328         mem_max_size = mem_cur_size;
 329 #endif
 330     return ptr;
 331 }
 332
 333 static void *tcc_mallocz(unsigned long size)
 334 {
 335     void *ptr;
 336     ptr = tcc_malloc(size);
 337     memset(ptr, 0, size);
 338     return ptr;
 339 }
 340
 341 static inline void *tcc_realloc(void *ptr, unsigned long size)
 342 {
 343     void *ptr1;
 344 #ifdef MEM_DEBUG
 345     mem_cur_size -= malloc_usable_size(ptr);
 346 #endif
 347     ptr1 = realloc(ptr, size);
 348 #ifdef MEM_DEBUG
 349     /* NOTE: count not correct if alloc error, but not critical */
 350     mem_cur_size += malloc_usable_size(ptr1);
 351     if (mem_cur_size > mem_max_size)
 352         mem_max_size = mem_cur_size;
 353 #endif
 354     return ptr1;
 355 }
 356
 357 static char *tcc_strdup(const char *str)
 358 {
 359     char *ptr;
 360     ptr = tcc_malloc(strlen(str) + 1);
 361     strcpy(ptr, str);
 362     return ptr;
 363 }
 364
 365 #define free(p) use_tcc_free(p)
 366 #define malloc(s) use_tcc_malloc(s)
 367 #define realloc(p, s) use_tcc_realloc(p, s)
 368
 369 static void dynarray_add(void ***ptab, int *nb_ptr, void *data)
 370 {
 371     int nb, nb_alloc;
 372     void **pp;
 373
 374     nb = *nb_ptr;
 375     pp = *ptab;
 376     /* every power of two we double array size */
 377     if ((nb & (nb - 1)) == 0) {
 378         if (!nb)
 379             nb_alloc = 1;
 380         else
 381             nb_alloc = nb * 2;
 382         pp = tcc_realloc(pp, nb_alloc * sizeof(void *));
 383         if (!pp)
 384             error("memory full");
 385         *ptab = pp;
 386     }
 387     pp[nb++] = data;
 388     *nb_ptr = nb;
 389 }
 390
 391 static void dynarray_reset(void *pp, int *n)
 392 {
 393     void **p;
 394     for (p = *(void***)pp; *n; ++p, --*n)
 395         if (*p)
 396             tcc_free(*p);
 397     tcc_free(*(void**)pp);
 398     *(void**)pp = NULL;
 399 }
 400
 401 /* symbol allocator */
 402 static Sym *__sym_malloc(void)
 403 {
 404     Sym *sym_pool, *sym, *last_sym;
 405     int i;
 406
 407     sym_pool = tcc_malloc(SYM_POOL_NB * sizeof(Sym));
 408     dynarray_add(&sym_pools, &nb_sym_pools, sym_pool);
 409
 410     last_sym = sym_free_first;
 411     sym = sym_pool;
 412     for(i = 0; i < SYM_POOL_NB; i++) {
 413         sym->next = last_sym;
 414         last_sym = sym;
 415         sym++;
 416     }
 417     sym_free_first = last_sym;
 418     return last_sym;
 419 }
 420
 421 static inline Sym *sym_malloc(void)
 422 {
 423     Sym *sym;
 424     sym = sym_free_first;
 425     if (!sym)
 426         sym = __sym_malloc();
 427     sym_free_first = sym->next;
 428     return sym;
 429 }
 430
 431 static inline void sym_free(Sym *sym)
 432 {
 433     sym->next = sym_free_first;
 434     sym_free_first = sym;
 435 }
 436
 437 Section *new_section(TCCState *s1, const char *name, int sh_type, int sh_flags)
 438 {
 439     Section *sec;
 440
 441     sec = tcc_mallocz(sizeof(Section) + strlen(name));
 442     strcpy(sec->name, name);
 443     sec->sh_type = sh_type;
 444     sec->sh_flags = sh_flags;
 445     switch(sh_type) {
 446     case SHT_HASH:
 447     case SHT_REL:
 448     case SHT_RELA:
 449     case SHT_DYNSYM:
 450     case SHT_SYMTAB:
 451     case SHT_DYNAMIC:
 452         sec->sh_addralign = 4;
 453         break;
 454     case SHT_STRTAB:
 455         sec->sh_addralign = 1;
 456         break;
 457     default:
 458         sec->sh_addralign = 32; /* default conservative alignment */
 459         break;
 460     }
 461
 462     if (sh_flags & SHF_PRIVATE) {
 463         dynarray_add((void ***)&s1->priv_sections, &s1->nb_priv_sections, sec);
 464     } else {
 465         sec->sh_num = s1->nb_sections;
 466         dynarray_add((void ***)&s1->sections, &s1->nb_sections, sec);
 467     }
 468
 469     return sec;
 470 }
 471
 472 static void free_section(Section *s)
 473 {
 474     tcc_free(s->data);
 475 }
 476
 477 /* realloc section and set its content to zero */
 478 static void section_realloc(Section *sec, unsigned long new_size)
 479 {
 480     unsigned long size;
 481     unsigned char *data;
 482
 483     size = sec->data_allocated;
 484     if (size == 0)
 485         size = 1;
 486     while (size < new_size)
 487         size = size * 2;
 488     data = tcc_realloc(sec->data, size);
 489     if (!data)
 490         error("memory full");
 491     memset(data + sec->data_allocated, 0, size - sec->data_allocated);
 492     sec->data = data;
 493     sec->data_allocated = size;
 494 }
 495
 496 /* reserve at least 'size' bytes in section 'sec' from
 497    sec->data_offset. */
 498 static void *section_ptr_add(Section *sec, unsigned long size)
 499 {
 500     unsigned long offset, offset1;
 501
 502     offset = sec->data_offset;
 503     offset1 = offset + size;
 504     if (offset1 > sec->data_allocated)
 505         section_realloc(sec, offset1);
 506     sec->data_offset = offset1;
 507     return sec->data + offset;
 508 }
 509
 510 /* return a reference to a section, and create it if it does not
 511    exists */
 512 Section *find_section(TCCState *s1, const char *name)
 513 {
 514     Section *sec;
 515     int i;
 516     for(i = 1; i < s1->nb_sections; i++) {
 517         sec = s1->sections[i];
 518         if (!strcmp(name, sec->name))
 519             return sec;
 520     }
 521     /* sections are created as PROGBITS */
 522     return new_section(s1, name, SHT_PROGBITS, SHF_ALLOC);
 523 }
 524
 525 /* update sym->c so that it points to an external symbol in section
 526    'section' with value 'value' */
 527 static void put_extern_sym2(Sym *sym, Section *section,
 528                             unsigned long value, unsigned long size,
 529                             int can_add_underscore)
 530 {
 531     int sym_type, sym_bind, sh_num, info, other, attr;
 532     ElfW(Sym) *esym;
 533     const char *name;
 534     char buf1[256];
 535
 536     if (section == NULL)
 537         sh_num = SHN_UNDEF;
 538     else if (section == SECTION_ABS)
 539         sh_num = SHN_ABS;
 540     else
 541         sh_num = section->sh_num;
 542
 543     other = attr = 0;
 544
 545     if ((sym->type.t & VT_BTYPE) == VT_FUNC) {
 546         sym_type = STT_FUNC;
 547 #ifdef TCC_TARGET_PE
 548         if (sym->type.ref)
 549             attr = sym->type.ref->r;
 550         if (FUNC_EXPORT(attr))
 551             other |= 1;
 552         if (FUNC_CALL(attr) == FUNC_STDCALL)
 553             other |= 2;
 554 #endif
 555     } else {
 556         sym_type = STT_OBJECT;
 557     }
 558
 559     if (sym->type.t & VT_STATIC)
 560         sym_bind = STB_LOCAL;
 561     else
 562         sym_bind = STB_GLOBAL;
 563
 564     if (!sym->c) {
 565         name = get_tok_str(sym->v, NULL);
 566 #ifdef CONFIG_TCC_BCHECK
 567         if (do_bounds_check) {
 568             char buf[32];
 569
 570             /* XXX: avoid doing that for statics ? */
 571             /* if bound checking is activated, we change some function
 572                names by adding the "__bound" prefix */
 573             switch(sym->v) {
 574 #if 0
 575             /* XXX: we rely only on malloc hooks */
 576             case TOK_malloc:
 577             case TOK_free:
 578             case TOK_realloc:
 579             case TOK_memalign:
 580             case TOK_calloc:
 581 #endif
 582             case TOK_memcpy:
 583             case TOK_memmove:
 584             case TOK_memset:
 585             case TOK_strlen:
 586             case TOK_strcpy:
 587             case TOK__alloca:
 588                 strcpy(buf, "__bound_");
 589                 strcat(buf, name);
 590                 name = buf;
 591                 break;
 592             }
 593         }
 594 #endif
 595
 596 #ifdef TCC_TARGET_PE
 597         if ((other & 2) && can_add_underscore) {
 598             sprintf(buf1, "_%s@%d", name, FUNC_ARGS(attr));
 599             name = buf1;
 600         } else
 601 #endif
 602         if (tcc_state->leading_underscore && can_add_underscore) {
 603             buf1[0] = '_';
 604             pstrcpy(buf1 + 1, sizeof(buf1) - 1, name);
 605             name = buf1;
 606         }
 607         info = ELFW(ST_INFO)(sym_bind, sym_type);
 608         sym->c = add_elf_sym(symtab_section, value, size, info, other, sh_num, name);
 609     } else {
 610         esym = &((ElfW(Sym) *)symtab_section->data)[sym->c];
 611         esym->st_value = value;
 612         esym->st_size = size;
 613         esym->st_shndx = sh_num;
 614         esym->st_other |= other;
 615     }
 616 }
 617
 618 static void put_extern_sym(Sym *sym, Section *section,
 619                            unsigned long value, unsigned long size)
 620 {
 621     put_extern_sym2(sym, section, value, size, 1);
 622 }
 623
 624 /* add a new relocation entry to symbol 'sym' in section 's' */
 625 static void greloc(Section *s, Sym *sym, unsigned long offset, int type)
 626 {
 627     if (!sym->c)
 628         put_extern_sym(sym, NULL, 0, 0);
 629     /* now we can add ELF relocation info */
 630     put_elf_reloc(symtab_section, s, offset, type, sym->c);
 631 }
 632
 633 static inline int isid(int c)
 634 {
 635     return (c >= 'a' && c <= 'z') ||
 636         (c >= 'A' && c <= 'Z') ||
 637         c == '_';
 638 }
 639
 640 static inline int isnum(int c)
 641 {
 642     return c >= '0' && c <= '9';
 643 }
 644
 645 static inline int isoct(int c)
 646 {
 647     return c >= '0' && c <= '7';
 648 }
 649
 650 static inline int toup(int c)
 651 {
 652     if (c >= 'a' && c <= 'z')
 653         return c - 'a' + 'A';
 654     else
 655         return c;
 656 }
 657
 658 static void strcat_vprintf(char *buf, int buf_size, const char *fmt, va_list ap)
 659 {
 660     int len;
 661     len = strlen(buf);
 662     vsnprintf(buf + len, buf_size - len, fmt, ap);
 663 }
 664
 665 static void strcat_printf(char *buf, int buf_size, const char *fmt, ...)
 666 {
 667     va_list ap;
 668     va_start(ap, fmt);
 669     strcat_vprintf(buf, buf_size, fmt, ap);
 670     va_end(ap);
 671 }
 672
 673 void error1(TCCState *s1, int is_warning, const char *fmt, va_list ap)
 674 {
 675     char buf[2048];
 676     BufferedFile **f;
 677
 678     buf[0] = '\0';
 679     if (file) {
 680         for(f = s1->include_stack; f < s1->include_stack_ptr; f++)
 681             strcat_printf(buf, sizeof(buf), "In file included from %s:%d:\n",
 682                           (*f)->filename, (*f)->line_num);
 683         if (file->line_num > 0) {
 684             strcat_printf(buf, sizeof(buf),
 685                           "%s:%d: ", file->filename, file->line_num);
 686         } else {
 687             strcat_printf(buf, sizeof(buf),
 688                           "%s: ", file->filename);
 689         }
 690     } else {
 691         strcat_printf(buf, sizeof(buf),
 692                       "tcc: ");
 693     }
 694     if (is_warning)
 695         strcat_printf(buf, sizeof(buf), "warning: ");
 696     strcat_vprintf(buf, sizeof(buf), fmt, ap);
 697
 698     if (!s1->error_func) {
 699         /* default case: stderr */
 700         fprintf(stderr, "%s\n", buf);
 701     } else {
 702         s1->error_func(s1->error_opaque, buf);
 703     }
 704     if (!is_warning || s1->warn_error)
 705         s1->nb_errors++;
 706 }
 707
 708 void tcc_set_error_func(TCCState *s, void *error_opaque,
 709                         void (*error_func)(void *opaque, const char *msg))
 710 {
 711     s->error_opaque = error_opaque;
 712     s->error_func = error_func;
 713 }
 714
 715 /* error without aborting current compilation */
 716 void error_noabort(const char *fmt, ...)
 717 {
 718     TCCState *s1 = tcc_state;
 719     va_list ap;
 720
 721     va_start(ap, fmt);
 722     error1(s1, 0, fmt, ap);
 723     va_end(ap);
 724 }
 725
 726 void error(const char *fmt, ...)
 727 {
 728     TCCState *s1 = tcc_state;
 729     va_list ap;
 730
 731     va_start(ap, fmt);
 732     error1(s1, 0, fmt, ap);
 733     va_end(ap);
 734     /* better than nothing: in some cases, we accept to handle errors */
 735     if (s1->error_set_jmp_enabled) {
 736         longjmp(s1->error_jmp_buf, 1);
 737     } else {
 738         /* XXX: eliminate this someday */
 739         exit(1);
 740     }
 741 }
 742
 743 void expect(const char *msg)
 744 {
 745     error("%s expected", msg);
 746 }
 747
 748 void warning(const char *fmt, ...)
 749 {
 750     TCCState *s1 = tcc_state;
 751     va_list ap;
 752
 753     if (s1->warn_none)
 754         return;
 755
 756     va_start(ap, fmt);
 757     error1(s1, 1, fmt, ap);
 758     va_end(ap);
 759 }
 760
 761 void skip(int c)
 762 {
 763     if (tok != c)
 764         error("'%c' expected", c);
 765     next();
 766 }
 767
 768 static void test_lvalue(void)
 769 {
 770     if (!(vtop->r & VT_LVAL))
 771         expect("lvalue");
 772 }
 773
 774 /* CString handling */
 775
 776 static void cstr_realloc(CString *cstr, int new_size)
 777 {
 778     int size;
 779     void *data;
 780
 781     size = cstr->size_allocated;
 782     if (size == 0)
 783         size = 8; /* no need to allocate a too small first string */
 784     while (size < new_size)
 785         size = size * 2;
 786     data = tcc_realloc(cstr->data_allocated, size);
 787     if (!data)
 788         error("memory full");
 789     cstr->data_allocated = data;
 790     cstr->size_allocated = size;
 791     cstr->data = data;
 792 }
 793
 794 /* add a byte */
 795 static inline void cstr_ccat(CString *cstr, int ch)
 796 {
 797     int size;
 798     size = cstr->size + 1;
 799     if (size > cstr->size_allocated)
 800         cstr_realloc(cstr, size);
 801     ((unsigned char *)cstr->data)[size - 1] = ch;
 802     cstr->size = size;
 803 }
 804
 805 static void cstr_cat(CString *cstr, const char *str)
 806 {
 807     int c;
 808     for(;;) {
 809         c = *str;
 810         if (c == '\0')
 811             break;
 812         cstr_ccat(cstr, c);
 813         str++;
 814     }
 815 }
 816
 817 /* add a wide char */
 818 static void cstr_wccat(CString *cstr, int ch)
 819 {
 820     int size;
 821     size = cstr->size + sizeof(nwchar_t);
 822     if (size > cstr->size_allocated)
 823         cstr_realloc(cstr, size);
 824     *(nwchar_t *)(((unsigned char *)cstr->data) + size - sizeof(nwchar_t)) = ch;
 825     cstr->size = size;
 826 }
 827
 828 static void cstr_new(CString *cstr)
 829 {
 830     memset(cstr, 0, sizeof(CString));
 831 }
 832
 833 /* free string and reset it to NULL */
 834 static void cstr_free(CString *cstr)
 835 {
 836     tcc_free(cstr->data_allocated);
 837     cstr_new(cstr);
 838 }
 839
 840 #define cstr_reset(cstr) cstr_free(cstr)
 841
 842 /* XXX: unicode ? */
 843 static void add_char(CString *cstr, int c)
 844 {
 845     if (c == '\'' || c == '\"' || c == '\\') {
 846         /* XXX: could be more precise if char or string */
 847         cstr_ccat(cstr, '\\');
 848     }
 849     if (c >= 32 && c <= 126) {
 850         cstr_ccat(cstr, c);
 851     } else {
 852         cstr_ccat(cstr, '\\');
 853         if (c == '\n') {
 854             cstr_ccat(cstr, 'n');
 855         } else {
 856             cstr_ccat(cstr, '0' + ((c >> 6) & 7));
 857             cstr_ccat(cstr, '0' + ((c >> 3) & 7));
 858             cstr_ccat(cstr, '0' + (c & 7));
 859         }
 860     }
 861 }
 862
 863 /* push, without hashing */
 864 static Sym *sym_push2(Sym **ps, int v, int t, long c)
 865 {
 866     Sym *s;
 867     s = sym_malloc();
 868     s->v = v;
 869     s->type.t = t;
 870     s->c = c;
 871     s->next = NULL;
 872     /* add in stack */
 873     s->prev = *ps;
 874     *ps = s;
 875     return s;
 876 }
 877
 878 /* find a symbol and return its associated structure. 's' is the top
 879    of the symbol stack */
 880 static Sym *sym_find2(Sym *s, int v)
 881 {
 882     while (s) {
 883         if (s->v == v)
 884             return s;
 885         s = s->prev;
 886     }
 887     return NULL;
 888 }
 889
 890 /* structure lookup */
 891 static inline Sym *struct_find(int v)
 892 {
 893     v -= TOK_IDENT;
 894     if ((unsigned)v >= (unsigned)(tok_ident - TOK_IDENT))
 895         return NULL;
 896     return table_ident[v]->sym_struct;
 897 }
 898
 899 /* find an identifier */
 900 static inline Sym *sym_find(int v)
 901 {
 902     v -= TOK_IDENT;
 903     if ((unsigned)v >= (unsigned)(tok_ident - TOK_IDENT))
 904         return NULL;
 905     return table_ident[v]->sym_identifier;
 906 }
 907
 908 /* push a given symbol on the symbol stack */
 909 static Sym *sym_push(int v, CType *type, int r, int c)
 910 {
 911     Sym *s, **ps;
 912     TokenSym *ts;
 913
 914     if (local_stack)
 915         ps = &local_stack;
 916     else
 917         ps = &global_stack;
 918     s = sym_push2(ps, v, type->t, c);
 919     s->type.ref = type->ref;
 920     s->r = r;
 921     /* don't record fields or anonymous symbols */
 922     /* XXX: simplify */
 923     if (!(v & SYM_FIELD) && (v & ~SYM_STRUCT) < SYM_FIRST_ANOM) {
 924         /* record symbol in token array */
 925         ts = table_ident[(v & ~SYM_STRUCT) - TOK_IDENT];
 926         if (v & SYM_STRUCT)
 927             ps = &ts->sym_struct;
 928         else
 929             ps = &ts->sym_identifier;
 930         s->prev_tok = *ps;
 931         *ps = s;
 932     }
 933     return s;
 934 }
 935
 936 /* push a global identifier */
 937 static Sym *global_identifier_push(int v, int t, int c)
 938 {
 939     Sym *s, **ps;
 940     s = sym_push2(&global_stack, v, t, c);
 941     /* don't record anonymous symbol */
 942     if (v < SYM_FIRST_ANOM) {
 943         ps = &table_ident[v - TOK_IDENT]->sym_identifier;
 944         /* modify the top most local identifier, so that
 945            sym_identifier will point to 's' when popped */
 946         while (*ps != NULL)
 947             ps = &(*ps)->prev_tok;
 948         s->prev_tok = NULL;
 949         *ps = s;
 950     }
 951     return s;
 952 }
 953
 954 /* pop symbols until top reaches 'b' */
 955 static void sym_pop(Sym **ptop, Sym *b)
 956 {
 957     Sym *s, *ss, **ps;
 958     TokenSym *ts;
 959     int v;
 960
 961     s = *ptop;
 962     while(s != b) {
 963         ss = s->prev;
 964         v = s->v;
 965         /* remove symbol in token array */
 966         /* XXX: simplify */
 967         if (!(v & SYM_FIELD) && (v & ~SYM_STRUCT) < SYM_FIRST_ANOM) {
 968             ts = table_ident[(v & ~SYM_STRUCT) - TOK_IDENT];
 969             if (v & SYM_STRUCT)
 970                 ps = &ts->sym_struct;
 971             else
 972                 ps = &ts->sym_identifier;
 973             *ps = s->prev_tok;
 974         }
 975         sym_free(s);
 976         s = ss;
 977     }
 978     *ptop = b;
 979 }
 980
 981 /* I/O layer */
 982
 983 BufferedFile *tcc_open(TCCState *s1, const char *filename)
 984 {
 985     int fd;
 986     BufferedFile *bf;
 987
 988     if (strcmp(filename, "-") == 0)
 989         fd = 0, filename = "stdin";
 990     else
 991         fd = open(filename, O_RDONLY | O_BINARY);
 992     if ((verbose == 2 && fd >= 0) || verbose == 3)
 993         printf("%s %*s%s\n", fd < 0 ? "nf":"->",
 994                (s1->include_stack_ptr - s1->include_stack), "", filename);
 995     if (fd < 0)
 996         return NULL;
 997     bf = tcc_malloc(sizeof(BufferedFile));
 998     bf->fd = fd;
 999     bf->buf_ptr = bf->buffer;
1000     bf->buf_end = bf->buffer;
1001     bf->buffer[0] = CH_EOB; /* put eob symbol */
1002     pstrcpy(bf->filename, sizeof(bf->filename), filename);
1003 #ifdef _WIN32
1004     normalize_slashes(bf->filename);
1005 #endif
1006     bf->line_num = 1;
1007     bf->ifndef_macro = 0;
1008     bf->ifdef_stack_ptr = s1->ifdef_stack_ptr;
1009     //    printf("opening '%s'\n", filename);
1010     return bf;
1011 }
1012
1013 void tcc_close(BufferedFile *bf)
1014 {
1015     total_lines += bf->line_num;
1016     close(bf->fd);
1017     tcc_free(bf);
1018 }
1019
1020 #include "tccpp.c"
1021 #include "tccgen.c"
1022
1023
1024 /* compile the C file opened in 'file'. Return non zero if errors. */
1025 static int tcc_compile(TCCState *s1)
1026 {
1027     Sym *define_start;
1028     char buf[512];
1029     volatile int section_sym;
1030
1031 #ifdef INC_DEBUG
1032     printf("%s: **** new file\n", file->filename);
1033 #endif
1034     preprocess_init(s1);
1035
1036     cur_text_section = NULL;
1037     funcname = "";
1038     anon_sym = SYM_FIRST_ANOM;
1039
1040     /* file info: full path + filename */
1041     section_sym = 0; /* avoid warning */
1042     if (do_debug) {
1043         section_sym = put_elf_sym(symtab_section, 0, 0,
1044                                   ELFW(ST_INFO)(STB_LOCAL, STT_SECTION), 0,
1045                                   text_section->sh_num, NULL);
1046         getcwd(buf, sizeof(buf));
1047 #ifdef _WIN32
1048         normalize_slashes(buf);
1049 #endif
1050         pstrcat(buf, sizeof(buf), "/");
1051         put_stabs_r(buf, N_SO, 0, 0,
1052                     text_section->data_offset, text_section, section_sym);
1053         put_stabs_r(file->filename, N_SO, 0, 0,
1054                     text_section->data_offset, text_section, section_sym);
1055     }
1056     /* an elf symbol of type STT_FILE must be put so that STB_LOCAL
1057        symbols can be safely used */
1058     put_elf_sym(symtab_section, 0, 0,
1059                 ELFW(ST_INFO)(STB_LOCAL, STT_FILE), 0,
1060                 SHN_ABS, file->filename);
1061
1062     /* define some often used types */
1063     int_type.t = VT_INT;
1064
1065     char_pointer_type.t = VT_BYTE;
1066     mk_pointer(&char_pointer_type);
1067
1068     func_old_type.t = VT_FUNC;
1069     func_old_type.ref = sym_push(SYM_FIELD, &int_type, FUNC_CDECL, FUNC_OLD);
1070
1071 #if defined(TCC_ARM_EABI) && defined(TCC_ARM_VFP)
1072     float_type.t = VT_FLOAT;
1073     double_type.t = VT_DOUBLE;
1074
1075     func_float_type.t = VT_FUNC;
1076     func_float_type.ref = sym_push(SYM_FIELD, &float_type, FUNC_CDECL, FUNC_OLD);
1077     func_double_type.t = VT_FUNC;
1078     func_double_type.ref = sym_push(SYM_FIELD, &double_type, FUNC_CDECL, FUNC_OLD);
1079 #endif
1080
1081 #if 0
1082     /* define 'void *alloca(unsigned int)' builtin function */
1083     {
1084         Sym *s1;
1085
1086         p = anon_sym++;
1087         sym = sym_push(p, mk_pointer(VT_VOID), FUNC_CDECL, FUNC_NEW);
1088         s1 = sym_push(SYM_FIELD, VT_UNSIGNED | VT_INT, 0, 0);
1089         s1->next = NULL;
1090         sym->next = s1;
1091         sym_push(TOK_alloca, VT_FUNC | (p << VT_STRUCT_SHIFT), VT_CONST, 0);
1092     }
1093 #endif
1094
1095     define_start = define_stack;
1096     nocode_wanted = 1;
1097
1098     if (setjmp(s1->error_jmp_buf) == 0) {
1099         s1->nb_errors = 0;
1100         s1->error_set_jmp_enabled = 1;
1101
1102         ch = file->buf_ptr[0];
1103         tok_flags = TOK_FLAG_BOL | TOK_FLAG_BOF;
1104         parse_flags = PARSE_FLAG_PREPROCESS | PARSE_FLAG_TOK_NUM;
1105         next();
1106         decl(VT_CONST);
1107         if (tok != TOK_EOF)
1108             expect("declaration");
1109
1110         /* end of translation unit info */
1111         if (do_debug) {
1112             put_stabs_r(NULL, N_SO, 0, 0,
1113                         text_section->data_offset, text_section, section_sym);
1114         }
1115     }
1116     s1->error_set_jmp_enabled = 0;
1117
1118     /* reset define stack, but leave -Dsymbols (may be incorrect if
1119        they are undefined) */
1120     free_defines(define_start);
1121
1122     gen_inline_functions();
1123
1124     sym_pop(&global_stack, NULL);
1125     sym_pop(&local_stack, NULL);
1126
1127     return s1->nb_errors != 0 ? -1 : 0;
1128 }
1129
1130 int tcc_compile_string(TCCState *s, const char *str)
1131 {
1132     BufferedFile bf1, *bf = &bf1;
1133     int ret, len;
1134     char *buf;
1135
1136     /* init file structure */
1137     bf->fd = -1;
1138     /* XXX: avoid copying */
1139     len = strlen(str);
1140     buf = tcc_malloc(len + 1);
1141     if (!buf)
1142         return -1;
1143     memcpy(buf, str, len);
1144     buf[len] = CH_EOB;
1145     bf->buf_ptr = buf;
1146     bf->buf_end = buf + len;
1147     pstrcpy(bf->filename, sizeof(bf->filename), "<string>");
1148     bf->line_num = 1;
1149     file = bf;
1150     ret = tcc_compile(s);
1151     file = NULL;
1152     tcc_free(buf);
1153
1154     /* currently, no need to close */
1155     return ret;
1156 }
1157
1158 /* define a preprocessor symbol. A value can also be provided with the '=' operator */
1159 void tcc_define_symbol(TCCState *s1, const char *sym, const char *value)
1160 {
1161     BufferedFile bf1, *bf = &bf1;
1162
1163     pstrcpy(bf->buffer, IO_BUF_SIZE, sym);
1164     pstrcat(bf->buffer, IO_BUF_SIZE, " ");
1165     /* default value */
1166     if (!value)
1167         value = "1";
1168     pstrcat(bf->buffer, IO_BUF_SIZE, value);
1169
1170     /* init file structure */
1171     bf->fd = -1;
1172     bf->buf_ptr = bf->buffer;
1173     bf->buf_end = bf->buffer + strlen(bf->buffer);
1174     *bf->buf_end = CH_EOB;
1175     bf->filename[0] = '\0';
1176     bf->line_num = 1;
1177     file = bf;
1178
1179     s1->include_stack_ptr = s1->include_stack;
1180
1181     /* parse with define parser */
1182     ch = file->buf_ptr[0];
1183     next_nomacro();
1184     parse_define();
1185     file = NULL;
1186 }
1187
1188 /* undefine a preprocessor symbol */
1189 void tcc_undefine_symbol(TCCState *s1, const char *sym)
1190 {
1191     TokenSym *ts;
1192     Sym *s;
1193     ts = tok_alloc(sym, strlen(sym));
1194     s = define_find(ts->tok);
1195     /* undefine symbol by putting an invalid name */
1196     if (s)
1197         define_undef(s);
1198 }
1199
1200 #ifdef CONFIG_TCC_ASM
1201
1202 #ifdef TCC_TARGET_I386
1203 #include "i386-asm.c"
1204 #endif
1205 #include "tccasm.c"
1206
1207 #else
1208 static void asm_instr(void)
1209 {
1210     error("inline asm() not supported");
1211 }
1212 static void asm_global_instr(void)
1213 {
1214     error("inline asm() not supported");
1215 }
1216 #endif
1217
1218 #include "tccelf.c"
1219
1220 #ifdef TCC_TARGET_COFF
1221 #include "tcccoff.c"
1222 #endif
1223
1224 #ifdef TCC_TARGET_PE
1225 #include "tccpe.c"
1226 #endif
1227
1228 #ifdef CONFIG_TCC_BACKTRACE
1229 /* print the position in the source file of PC value 'pc' by reading
1230    the stabs debug information */
1231 static void rt_printline(unsigned long wanted_pc)
1232 {
1233     Stab_Sym *sym, *sym_end;
1234     char func_name[128], last_func_name[128];
1235     unsigned long func_addr, last_pc, pc;
1236     const char *incl_files[INCLUDE_STACK_SIZE];
1237     int incl_index, len, last_line_num, i;
1238     const char *str, *p;
1239
1240     fprintf(stderr, "0x%08lx:", wanted_pc);
1241
1242     func_name[0] = '\0';
1243     func_addr = 0;
1244     incl_index = 0;
1245     last_func_name[0] = '\0';
1246     last_pc = 0xffffffff;
1247     last_line_num = 1;
1248     sym = (Stab_Sym *)stab_section->data + 1;
1249     sym_end = (Stab_Sym *)(stab_section->data + stab_section->data_offset);
1250     while (sym < sym_end) {
1251         switch(sym->n_type) {
1252             /* function start or end */
1253         case N_FUN:
1254             if (sym->n_strx == 0) {
1255                 /* we test if between last line and end of function */
1256                 pc = sym->n_value + func_addr;
1257                 if (wanted_pc >= last_pc && wanted_pc < pc)
1258                     goto found;
1259                 func_name[0] = '\0';
1260                 func_addr = 0;
1261             } else {
1262                 str = stabstr_section->data + sym->n_strx;
1263                 p = strchr(str, ':');
1264                 if (!p) {
1265                     pstrcpy(func_name, sizeof(func_name), str);
1266                 } else {
1267                     len = p - str;
1268                     if (len > sizeof(func_name) - 1)
1269                         len = sizeof(func_name) - 1;
1270                     memcpy(func_name, str, len);
1271                     func_name[len] = '\0';
1272                 }
1273                 func_addr = sym->n_value;
1274             }
1275             break;
1276             /* line number info */
1277         case N_SLINE:
1278             pc = sym->n_value + func_addr;
1279             if (wanted_pc >= last_pc && wanted_pc < pc)
1280                 goto found;
1281             last_pc = pc;
1282             last_line_num = sym->n_desc;
1283             /* XXX: slow! */
1284             strcpy(last_func_name, func_name);
1285             break;
1286             /* include files */
1287         case N_BINCL:
1288             str = stabstr_section->data + sym->n_strx;
1289         add_incl:
1290             if (incl_index < INCLUDE_STACK_SIZE) {
1291                 incl_files[incl_index++] = str;
1292             }
1293             break;
1294         case N_EINCL:
1295             if (incl_index > 1)
1296                 incl_index--;
1297             break;
1298         case N_SO:
1299             if (sym->n_strx == 0) {
1300                 incl_index = 0; /* end of translation unit */
1301             } else {
1302                 str = stabstr_section->data + sym->n_strx;
1303                 /* do not add path */
1304                 len = strlen(str);
1305                 if (len > 0 && str[len - 1] != '/')
1306                     goto add_incl;
1307             }
1308             break;
1309         }
1310         sym++;
1311     }
1312
1313     /* second pass: we try symtab symbols (no line number info) */
1314     incl_index = 0;
1315     {
1316         ElfW(Sym) *sym, *sym_end;
1317         int type;
1318
1319         sym_end = (ElfW(Sym) *)(symtab_section->data + symtab_section->data_offset);
1320         for(sym = (ElfW(Sym) *)symtab_section->data + 1;
1321             sym < sym_end;
1322             sym++) {
1323             type = ELFW(ST_TYPE)(sym->st_info);
1324             if (type == STT_FUNC) {
1325                 if (wanted_pc >= sym->st_value &&
1326                     wanted_pc < sym->st_value + sym->st_size) {
1327                     pstrcpy(last_func_name, sizeof(last_func_name),
1328                             strtab_section->data + sym->st_name);
1329                     goto found;
1330                 }
1331             }
1332         }
1333     }
1334     /* did not find any info: */
1335     fprintf(stderr, " ???\n");
1336     return;
1337  found:
1338     if (last_func_name[0] != '\0') {
1339         fprintf(stderr, " %s()", last_func_name);
1340     }
1341     if (incl_index > 0) {
1342         fprintf(stderr, " (%s:%d",
1343                 incl_files[incl_index - 1], last_line_num);
1344         for(i = incl_index - 2; i >= 0; i--)
1345             fprintf(stderr, ", included from %s", incl_files[i]);
1346         fprintf(stderr, ")");
1347     }
1348     fprintf(stderr, "\n");
1349 }
1350
1351 #ifdef __i386__
1352 /* fix for glibc 2.1 */
1353 #ifndef REG_EIP
1354 #define REG_EIP EIP
1355 #define REG_EBP EBP
1356 #endif
1357
1358 /* return the PC at frame level 'level'. Return non zero if not found */
1359 static int rt_get_caller_pc(unsigned long *paddr,
1360                             ucontext_t *uc, int level)
1361 {
1362     unsigned long fp;
1363     int i;
1364
1365     if (level == 0) {
1366 #if defined(__FreeBSD__)
1367         *paddr = uc->uc_mcontext.mc_eip;
1368 #elif defined(__dietlibc__)
1369         *paddr = uc->uc_mcontext.eip;
1370 #else
1371         *paddr = uc->uc_mcontext.gregs[REG_EIP];
1372 #endif
1373         return 0;
1374     } else {
1375 #if defined(__FreeBSD__)
1376         fp = uc->uc_mcontext.mc_ebp;
1377 #elif defined(__dietlibc__)
1378         fp = uc->uc_mcontext.ebp;
1379 #else
1380         fp = uc->uc_mcontext.gregs[REG_EBP];
1381 #endif
1382         for(i=1;i<level;i++) {
1383             /* XXX: check address validity with program info */
1384             if (fp <= 0x1000 || fp >= 0xc0000000)
1385                 return -1;
1386             fp = ((unsigned long *)fp)[0];
1387         }
1388         *paddr = ((unsigned long *)fp)[1];
1389         return 0;
1390     }
1391 }
1392 #elif defined(__x86_64__)
1393 /* return the PC at frame level 'level'. Return non zero if not found */
1394 static int rt_get_caller_pc(unsigned long *paddr,
1395                             ucontext_t *uc, int level)
1396 {
1397     unsigned long fp;
1398     int i;
1399
1400     if (level == 0) {
1401         /* XXX: only support linux */
1402         *paddr = uc->uc_mcontext.gregs[REG_RIP];
1403         return 0;
1404     } else {
1405         fp = uc->uc_mcontext.gregs[REG_RBP];
1406         for(i=1;i<level;i++) {
1407             /* XXX: check address validity with program info */
1408             if (fp <= 0x1000)
1409                 return -1;
1410             fp = ((unsigned long *)fp)[0];
1411         }
1412         *paddr = ((unsigned long *)fp)[1];
1413         return 0;
1414     }
1415 }
1416 #else
1417 #warning add arch specific rt_get_caller_pc()
1418 static int rt_get_caller_pc(unsigned long *paddr,
1419                             ucontext_t *uc, int level)
1420 {
1421     return -1;
1422 }
1423 #endif
1424
1425 /* emit a run time error at position 'pc' */
1426 void rt_error(ucontext_t *uc, const char *fmt, ...)
1427 {
1428     va_list ap;
1429     unsigned long pc;
1430     int i;
1431
1432     va_start(ap, fmt);
1433     fprintf(stderr, "Runtime error: ");
1434     vfprintf(stderr, fmt, ap);
1435     fprintf(stderr, "\n");
1436     for(i=0;i<num_callers;i++) {
1437         if (rt_get_caller_pc(&pc, uc, i) < 0)
1438             break;
1439         if (i == 0)
1440             fprintf(stderr, "at ");
1441         else
1442             fprintf(stderr, "by ");
1443         rt_printline(pc);
1444     }
1445     exit(255);
1446     va_end(ap);
1447 }
1448
1449 /* signal handler for fatal errors */
1450 static void sig_error(int signum, siginfo_t *siginf, void *puc)
1451 {
1452     ucontext_t *uc = puc;
1453
1454     switch(signum) {
1455     case SIGFPE:
1456         switch(siginf->si_code) {
1457         case FPE_INTDIV:
1458         case FPE_FLTDIV:
1459             rt_error(uc, "division by zero");
1460             break;
1461         default:
1462             rt_error(uc, "floating point exception");
1463             break;
1464         }
1465         break;
1466     case SIGBUS:
1467     case SIGSEGV:
1468         if (rt_bound_error_msg && *rt_bound_error_msg)
1469             rt_error(uc, *rt_bound_error_msg);
1470         else
1471             rt_error(uc, "dereferencing invalid pointer");
1472         break;
1473     case SIGILL:
1474         rt_error(uc, "illegal instruction");
1475         break;
1476     case SIGABRT:
1477         rt_error(uc, "abort() called");
1478         break;
1479     default:
1480         rt_error(uc, "caught signal %d", signum);
1481         break;
1482     }
1483     exit(255);
1484 }
1485
1486 #endif
1487
1488 /* copy code into memory passed in by the caller and do all relocations
1489    (needed before using tcc_get_symbol()).
1490    returns -1 on error and required size if ptr is NULL */
1491 int tcc_relocate(TCCState *s1, void *ptr)
1492 {
1493     Section *s;
1494     unsigned long offset, length, mem;
1495     int i;
1496
1497     if (0 == s1->runtime_added) {
1498         s1->runtime_added = 1;
1499         s1->nb_errors = 0;
1500 #ifdef TCC_TARGET_PE
1501         pe_add_runtime(s1);
1502         relocate_common_syms();
1503         tcc_add_linker_symbols(s1);
1504 #else
1505         tcc_add_runtime(s1);
1506         relocate_common_syms();
1507         tcc_add_linker_symbols(s1);
1508         build_got_entries(s1);
1509 #endif
1510     }
1511
1512     offset = 0, mem = (unsigned long)ptr;
1513     for(i = 1; i < s1->nb_sections; i++) {
1514         s = s1->sections[i];
1515         if (0 == (s->sh_flags & SHF_ALLOC))
1516             continue;
1517         length = s->data_offset;
1518         s->sh_addr = mem ? (mem + offset + 15) & ~15 : 0;
1519         offset = (offset + length + 15) & ~15;
1520     }
1521
1522     /* relocate symbols */
1523     relocate_syms(s1, 1);
1524     if (s1->nb_errors)
1525         return -1;
1526
1527 #ifdef TCC_TARGET_X86_64
1528     s1->runtime_plt_and_got_offset = 0;
1529     s1->runtime_plt_and_got = (char *)(mem + offset);
1530     /* double the size of the buffer for got and plt entries
1531        XXX: calculate exact size for them? */
1532     offset *= 2;
1533 #endif
1534
1535     if (0 == mem)
1536         return offset + 15;
1537
1538     /* relocate each section */
1539     for(i = 1; i < s1->nb_sections; i++) {
1540         s = s1->sections[i];
1541         if (s->reloc)
1542             relocate_section(s1, s);
1543     }
1544
1545     for(i = 1; i < s1->nb_sections; i++) {
1546         s = s1->sections[i];
1547         if (0 == (s->sh_flags & SHF_ALLOC))
1548             continue;
1549         length = s->data_offset;
1550         // printf("%-12s %08x %04x\n", s->name, s->sh_addr, length);
1551         ptr = (void*)s->sh_addr;
1552         if (NULL == s->data || s->sh_type == SHT_NOBITS)
1553             memset(ptr, 0, length);
1554         else
1555             memcpy(ptr, s->data, length);
1556         /* mark executable sections as executable in memory */
1557         if (s->sh_flags & SHF_EXECINSTR)
1558             set_pages_executable(ptr, length);
1559     }
1560 #ifdef TCC_TARGET_X86_64
1561     set_pages_executable(s1->runtime_plt_and_got,
1562                          s1->runtime_plt_and_got_offset);
1563 #endif
1564     return 0;
1565 }
1566
1567 /* launch the compiled program with the given arguments */
1568 int tcc_run(TCCState *s1, int argc, char **argv)
1569 {
1570     int (*prog_main)(int, char **);
1571     void *ptr;
1572     int ret;
1573
1574     ret = tcc_relocate(s1, NULL);
1575     if (ret < 0)
1576         return -1;
1577     ptr = tcc_malloc(ret);
1578     tcc_relocate(s1, ptr);
1579
1580     prog_main = tcc_get_symbol_err(s1, "main");
1581
1582     if (do_debug) {
1583 #ifdef CONFIG_TCC_BACKTRACE
1584         struct sigaction sigact;
1585         /* install TCC signal handlers to print debug info on fatal
1586            runtime errors */
1587         sigact.sa_flags = SA_SIGINFO | SA_RESETHAND;
1588         sigact.sa_sigaction = sig_error;
1589         sigemptyset(&sigact.sa_mask);
1590         sigaction(SIGFPE, &sigact, NULL);
1591         sigaction(SIGILL, &sigact, NULL);
1592         sigaction(SIGSEGV, &sigact, NULL);
1593         sigaction(SIGBUS, &sigact, NULL);
1594         sigaction(SIGABRT, &sigact, NULL);
1595 #else
1596         error("debug mode not available");
1597 #endif
1598     }
1599
1600 #ifdef CONFIG_TCC_BCHECK
1601     if (do_bounds_check) {
1602         void (*bound_init)(void);
1603
1604         /* set error function */
1605         rt_bound_error_msg = tcc_get_symbol_err(s1, "__bound_error_msg");
1606
1607         /* XXX: use .init section so that it also work in binary ? */
1608         bound_init = (void *)tcc_get_symbol_err(s1, "__bound_init");
1609         bound_init();
1610     }
1611 #endif
1612     ret = (*prog_main)(argc, argv);
1613     tcc_free(ptr);
1614     return ret;
1615 }
1616
1617 void tcc_memstats(void)
1618 {
1619 #ifdef MEM_DEBUG
1620     printf("memory in use: %d\n", mem_cur_size);
1621 #endif
1622 }
1623
1624 static void tcc_cleanup(void)
1625 {
1626     int i, n;
1627
1628     if (NULL == tcc_state)
1629         return;
1630     tcc_state = NULL;
1631
1632     /* free -D defines */
1633     free_defines(NULL);
1634
1635     /* free tokens */
1636     n = tok_ident - TOK_IDENT;
1637     for(i = 0; i < n; i++)
1638         tcc_free(table_ident[i]);
1639     tcc_free(table_ident);
1640
1641     /* free sym_pools */
1642     dynarray_reset(&sym_pools, &nb_sym_pools);
1643     /* string buffer */
1644     cstr_free(&tokcstr);
1645     /* reset symbol stack */
1646     sym_free_first = NULL;
1647     /* cleanup from error/setjmp */
1648     macro_ptr = NULL;
1649 }
1650
1651 TCCState *tcc_new(void)
1652 {
1653     TCCState *s;
1654
1655     tcc_cleanup();
1656
1657     s = tcc_mallocz(sizeof(TCCState));
1658     if (!s)
1659         return NULL;
1660     tcc_state = s;
1661     s->output_type = TCC_OUTPUT_MEMORY;
1662
1663     preprocess_new();
1664
1665     /* we add dummy defines for some special macros to speed up tests
1666        and to have working defined() */
1667     define_push(TOK___LINE__, MACRO_OBJ, NULL, NULL);
1668     define_push(TOK___FILE__, MACRO_OBJ, NULL, NULL);
1669     define_push(TOK___DATE__, MACRO_OBJ, NULL, NULL);
1670     define_push(TOK___TIME__, MACRO_OBJ, NULL, NULL);
1671
1672     /* standard defines */
1673     tcc_define_symbol(s, "__STDC__", NULL);
1674     tcc_define_symbol(s, "__STDC_VERSION__", "199901L");
1675 #if defined(TCC_TARGET_I386)
1676     tcc_define_symbol(s, "__i386__", NULL);
1677 #endif
1678 #if defined(TCC_TARGET_X86_64)
1679     tcc_define_symbol(s, "__x86_64__", NULL);
1680 #endif
1681 #if defined(TCC_TARGET_ARM)
1682     tcc_define_symbol(s, "__ARM_ARCH_4__", NULL);
1683     tcc_define_symbol(s, "__arm_elf__", NULL);
1684     tcc_define_symbol(s, "__arm_elf", NULL);
1685     tcc_define_symbol(s, "arm_elf", NULL);
1686     tcc_define_symbol(s, "__arm__", NULL);
1687     tcc_define_symbol(s, "__arm", NULL);
1688     tcc_define_symbol(s, "arm", NULL);
1689     tcc_define_symbol(s, "__APCS_32__", NULL);
1690 #endif
1691 #ifdef TCC_TARGET_PE
1692     tcc_define_symbol(s, "_WIN32", NULL);
1693 #else
1694     tcc_define_symbol(s, "__unix__", NULL);
1695     tcc_define_symbol(s, "__unix", NULL);
1696 #if defined(__linux)
1697     tcc_define_symbol(s, "__linux__", NULL);
1698     tcc_define_symbol(s, "__linux", NULL);
1699 #endif
1700 #endif
1701     /* tiny C specific defines */
1702     tcc_define_symbol(s, "__TINYC__", NULL);
1703
1704     /* tiny C & gcc defines */
1705     tcc_define_symbol(s, "__SIZE_TYPE__", "unsigned int");
1706     tcc_define_symbol(s, "__PTRDIFF_TYPE__", "int");
1707 #ifdef TCC_TARGET_PE
1708     tcc_define_symbol(s, "__WCHAR_TYPE__", "unsigned short");
1709 #else
1710     tcc_define_symbol(s, "__WCHAR_TYPE__", "int");
1711 #endif
1712
1713 #ifndef TCC_TARGET_PE
1714     /* default library paths */
1715     tcc_add_library_path(s, CONFIG_SYSROOT "/usr/local/lib");
1716     tcc_add_library_path(s, CONFIG_SYSROOT "/usr/lib");
1717     tcc_add_library_path(s, CONFIG_SYSROOT "/lib");
1718 #endif
1719
1720     /* no section zero */
1721     dynarray_add((void ***)&s->sections, &s->nb_sections, NULL);
1722
1723     /* create standard sections */
1724     text_section = new_section(s, ".text", SHT_PROGBITS, SHF_ALLOC | SHF_EXECINSTR);
1725     data_section = new_section(s, ".data", SHT_PROGBITS, SHF_ALLOC | SHF_WRITE);
1726     bss_section = new_section(s, ".bss", SHT_NOBITS, SHF_ALLOC | SHF_WRITE);
1727
1728     /* symbols are always generated for linking stage */
1729     symtab_section = new_symtab(s, ".symtab", SHT_SYMTAB, 0,
1730                                 ".strtab",
1731                                 ".hashtab", SHF_PRIVATE);
1732     strtab_section = symtab_section->link;
1733
1734     /* private symbol table for dynamic symbols */
1735     s->dynsymtab_section = new_symtab(s, ".dynsymtab", SHT_SYMTAB, SHF_PRIVATE,
1736                                       ".dynstrtab",
1737                                       ".dynhashtab", SHF_PRIVATE);
1738     s->alacarte_link = 1;
1739
1740 #ifdef CHAR_IS_UNSIGNED
1741     s->char_is_unsigned = 1;
1742 #endif
1743 #if defined(TCC_TARGET_PE) && 0
1744     /* XXX: currently the PE linker is not ready to support that */
1745     s->leading_underscore = 1;
1746 #endif
1747     return s;
1748 }
1749
1750 void tcc_delete(TCCState *s1)
1751 {
1752     int i;
1753
1754     tcc_cleanup();
1755
1756     /* free all sections */
1757     for(i = 1; i < s1->nb_sections; i++)
1758         free_section(s1->sections[i]);
1759     dynarray_reset(&s1->sections, &s1->nb_sections);
1760
1761     for(i = 0; i < s1->nb_priv_sections; i++)
1762         free_section(s1->priv_sections[i]);
1763     dynarray_reset(&s1->priv_sections, &s1->nb_priv_sections);
1764
1765     /* free any loaded DLLs */
1766     for ( i = 0; i < s1->nb_loaded_dlls; i++) {
1767         DLLReference *ref = s1->loaded_dlls[i];
1768         if ( ref->handle )
1769             dlclose(ref->handle);
1770     }
1771
1772     /* free loaded dlls array */
1773     dynarray_reset(&s1->loaded_dlls, &s1->nb_loaded_dlls);
1774
1775     /* free library paths */
1776     dynarray_reset(&s1->library_paths, &s1->nb_library_paths);
1777
1778     /* free include paths */
1779     dynarray_reset(&s1->cached_includes, &s1->nb_cached_includes);
1780     dynarray_reset(&s1->include_paths, &s1->nb_include_paths);
1781     dynarray_reset(&s1->sysinclude_paths, &s1->nb_sysinclude_paths);
1782
1783     tcc_free(s1);
1784 }
1785
1786 int tcc_add_include_path(TCCState *s1, const char *pathname)
1787 {
1788     char *pathname1;
1789
1790     pathname1 = tcc_strdup(pathname);
1791     dynarray_add((void ***)&s1->include_paths, &s1->nb_include_paths, pathname1);
1792     return 0;
1793 }
1794
1795 int tcc_add_sysinclude_path(TCCState *s1, const char *pathname)
1796 {
1797     char *pathname1;
1798
1799     pathname1 = tcc_strdup(pathname);
1800     dynarray_add((void ***)&s1->sysinclude_paths, &s1->nb_sysinclude_paths, pathname1);
1801     return 0;
1802 }
1803
1804 static int tcc_add_file_internal(TCCState *s1, const char *filename, int flags)
1805 {
1806     const char *ext;
1807     ElfW(Ehdr) ehdr;
1808     int fd, ret;
1809     BufferedFile *saved_file;
1810
1811     /* find source file type with extension */
1812     ext = tcc_fileextension(filename);
1813     if (ext[0])
1814         ext++;
1815
1816     /* open the file */
1817     saved_file = file;
1818     file = tcc_open(s1, filename);
1819     if (!file) {
1820         if (flags & AFF_PRINT_ERROR) {
1821             error_noabort("file '%s' not found", filename);
1822         }
1823         ret = -1;
1824         goto fail1;
1825     }
1826
1827     if (flags & AFF_PREPROCESS) {
1828         ret = tcc_preprocess(s1);
1829     } else if (!ext[0] || !PATHCMP(ext, "c")) {
1830         /* C file assumed */
1831         ret = tcc_compile(s1);
1832     } else
1833 #ifdef CONFIG_TCC_ASM
1834     if (!strcmp(ext, "S")) {
1835         /* preprocessed assembler */
1836         ret = tcc_assemble(s1, 1);
1837     } else if (!strcmp(ext, "s")) {
1838         /* non preprocessed assembler */
1839         ret = tcc_assemble(s1, 0);
1840     } else
1841 #endif
1842 #ifdef TCC_TARGET_PE
1843     if (!PATHCMP(ext, "def")) {
1844         ret = pe_load_def_file(s1, file->fd);
1845     } else
1846 #endif
1847     {
1848         fd = file->fd;
1849         /* assume executable format: auto guess file type */
1850         ret = read(fd, &ehdr, sizeof(ehdr));
1851         lseek(fd, 0, SEEK_SET);
1852         if (ret <= 0) {
1853             error_noabort("could not read header");
1854             goto fail;
1855         } else if (ret != sizeof(ehdr)) {
1856             goto try_load_script;
1857         }
1858
1859         if (ehdr.e_ident[0] == ELFMAG0 &&
1860             ehdr.e_ident[1] == ELFMAG1 &&
1861             ehdr.e_ident[2] == ELFMAG2 &&
1862             ehdr.e_ident[3] == ELFMAG3) {
1863             file->line_num = 0; /* do not display line number if error */
1864             if (ehdr.e_type == ET_REL) {
1865                 ret = tcc_load_object_file(s1, fd, 0);
1866             } else if (ehdr.e_type == ET_DYN) {
1867                 if (s1->output_type == TCC_OUTPUT_MEMORY) {
1868 #ifdef TCC_TARGET_PE
1869                     ret = -1;
1870 #else
1871                     void *h;
1872                     h = dlopen(filename, RTLD_GLOBAL | RTLD_LAZY);
1873                     if (h)
1874                         ret = 0;
1875                     else
1876                         ret = -1;
1877 #endif
1878                 } else {
1879                     ret = tcc_load_dll(s1, fd, filename,
1880                                        (flags & AFF_REFERENCED_DLL) != 0);
1881                 }
1882             } else {
1883                 error_noabort("unrecognized ELF file");
1884                 goto fail;
1885             }
1886         } else if (memcmp((char *)&ehdr, ARMAG, 8) == 0) {
1887             file->line_num = 0; /* do not display line number if error */
1888             ret = tcc_load_archive(s1, fd);
1889         } else
1890 #ifdef TCC_TARGET_COFF
1891         if (*(uint16_t *)(&ehdr) == COFF_C67_MAGIC) {
1892             ret = tcc_load_coff(s1, fd);
1893         } else
1894 #endif
1895 #ifdef TCC_TARGET_PE
1896         if (pe_test_res_file(&ehdr, ret)) {
1897             ret = pe_load_res_file(s1, fd);
1898         } else
1899 #endif
1900         {
1901             /* as GNU ld, consider it is an ld script if not recognized */
1902         try_load_script:
1903             ret = tcc_load_ldscript(s1);
1904             if (ret < 0) {
1905                 error_noabort("unrecognized file type");
1906                 goto fail;
1907             }
1908         }
1909     }
1910  the_end:
1911     tcc_close(file);
1912  fail1:
1913     file = saved_file;
1914     return ret;
1915  fail:
1916     ret = -1;
1917     goto the_end;
1918 }
1919
1920 int tcc_add_file(TCCState *s, const char *filename)
1921 {
1922     return tcc_add_file_internal(s, filename, AFF_PRINT_ERROR);
1923 }
1924
1925 int tcc_add_library_path(TCCState *s, const char *pathname)
1926 {
1927     char *pathname1;
1928
1929     pathname1 = tcc_strdup(pathname);
1930     dynarray_add((void ***)&s->library_paths, &s->nb_library_paths, pathname1);
1931     return 0;
1932 }
1933
1934 /* find and load a dll. Return non zero if not found */
1935 /* XXX: add '-rpath' option support ? */
1936 static int tcc_add_dll(TCCState *s, const char *filename, int flags)
1937 {
1938     char buf[1024];
1939     int i;
1940
1941     for(i = 0; i < s->nb_library_paths; i++) {
1942         snprintf(buf, sizeof(buf), "%s/%s",
1943                  s->library_paths[i], filename);
1944         if (tcc_add_file_internal(s, buf, flags) == 0)
1945             return 0;
1946     }
1947     return -1;
1948 }
1949
1950 /* the library name is the same as the argument of the '-l' option */
1951 int tcc_add_library(TCCState *s, const char *libraryname)
1952 {
1953     char buf[1024];
1954     int i;
1955
1956     /* first we look for the dynamic library if not static linking */
1957     if (!s->static_link) {
1958 #ifdef TCC_TARGET_PE
1959         snprintf(buf, sizeof(buf), "%s.def", libraryname);
1960 #else
1961         snprintf(buf, sizeof(buf), "lib%s.so", libraryname);
1962 #endif
1963         if (tcc_add_dll(s, buf, 0) == 0)
1964             return 0;
1965     }
1966
1967     /* then we look for the static library */
1968     for(i = 0; i < s->nb_library_paths; i++) {
1969         snprintf(buf, sizeof(buf), "%s/lib%s.a",
1970                  s->library_paths[i], libraryname);
1971         if (tcc_add_file_internal(s, buf, 0) == 0)
1972             return 0;
1973     }
1974     return -1;
1975 }
1976
1977 int tcc_add_symbol(TCCState *s, const char *name, void *val)
1978 {
1979     add_elf_sym(symtab_section, (unsigned long)val, 0,
1980                 ELFW(ST_INFO)(STB_GLOBAL, STT_NOTYPE), 0,
1981                 SHN_ABS, name);
1982     return 0;
1983 }
1984
1985 int tcc_set_output_type(TCCState *s, int output_type)
1986 {
1987     char buf[1024];
1988
1989     s->output_type = output_type;
1990
1991     if (!s->nostdinc) {
1992         /* default include paths */
1993         /* XXX: reverse order needed if -isystem support */
1994 #ifndef TCC_TARGET_PE
1995         tcc_add_sysinclude_path(s, CONFIG_SYSROOT "/usr/local/include");
1996         tcc_add_sysinclude_path(s, CONFIG_SYSROOT "/usr/include");
1997 #endif
1998         snprintf(buf, sizeof(buf), "%s/include", tcc_lib_path);
1999         tcc_add_sysinclude_path(s, buf);
2000 #ifdef TCC_TARGET_PE
2001         snprintf(buf, sizeof(buf), "%s/include/winapi", tcc_lib_path);
2002         tcc_add_sysinclude_path(s, buf);
2003 #endif
2004     }
2005
2006     /* if bound checking, then add corresponding sections */
2007 #ifdef CONFIG_TCC_BCHECK
2008     if (do_bounds_check) {
2009         /* define symbol */
2010         tcc_define_symbol(s, "__BOUNDS_CHECKING_ON", NULL);
2011         /* create bounds sections */
2012         bounds_section = new_section(s, ".bounds",
2013                                      SHT_PROGBITS, SHF_ALLOC);
2014         lbounds_section = new_section(s, ".lbounds",
2015                                       SHT_PROGBITS, SHF_ALLOC);
2016     }
2017 #endif
2018
2019     if (s->char_is_unsigned) {
2020         tcc_define_symbol(s, "__CHAR_UNSIGNED__", NULL);
2021     }
2022
2023     /* add debug sections */
2024     if (do_debug) {
2025         /* stab symbols */
2026         stab_section = new_section(s, ".stab", SHT_PROGBITS, 0);
2027         stab_section->sh_entsize = sizeof(Stab_Sym);
2028         stabstr_section = new_section(s, ".stabstr", SHT_STRTAB, 0);
2029         put_elf_str(stabstr_section, "");
2030         stab_section->link = stabstr_section;
2031         /* put first entry */
2032         put_stabs("", 0, 0, 0, 0);
2033     }
2034
2035     /* add libc crt1/crti objects */
2036 #ifndef TCC_TARGET_PE
2037     if ((output_type == TCC_OUTPUT_EXE || output_type == TCC_OUTPUT_DLL) &&
2038         !s->nostdlib) {
2039         if (output_type != TCC_OUTPUT_DLL)
2040             tcc_add_file(s, CONFIG_TCC_CRT_PREFIX "/crt1.o");
2041         tcc_add_file(s, CONFIG_TCC_CRT_PREFIX "/crti.o");
2042     }
2043 #endif
2044
2045 #ifdef TCC_TARGET_PE
2046     snprintf(buf, sizeof(buf), "%s/lib", tcc_lib_path);
2047     tcc_add_library_path(s, buf);
2048 #endif
2049
2050     return 0;
2051 }
2052
2053 #define WD_ALL    0x0001 /* warning is activated when using -Wall */
2054 #define FD_INVERT 0x0002 /* invert value before storing */
2055
2056 typedef struct FlagDef {
2057     uint16_t offset;
2058     uint16_t flags;
2059     const char *name;
2060 } FlagDef;
2061
2062 static const FlagDef warning_defs[] = {
2063     { offsetof(TCCState, warn_unsupported), 0, "unsupported" },
2064     { offsetof(TCCState, warn_write_strings), 0, "write-strings" },
2065     { offsetof(TCCState, warn_error), 0, "error" },
2066     { offsetof(TCCState, warn_implicit_function_declaration), WD_ALL,
2067       "implicit-function-declaration" },
2068 };
2069
2070 static int set_flag(TCCState *s, const FlagDef *flags, int nb_flags,
2071                     const char *name, int value)
2072 {
2073     int i;
2074     const FlagDef *p;
2075     const char *r;
2076
2077     r = name;
2078     if (r[0] == 'n' && r[1] == 'o' && r[2] == '-') {
2079         r += 3;
2080         value = !value;
2081     }
2082     for(i = 0, p = flags; i < nb_flags; i++, p++) {
2083         if (!strcmp(r, p->name))
2084             goto found;
2085     }
2086     return -1;
2087  found:
2088     if (p->flags & FD_INVERT)
2089         value = !value;
2090     *(int *)((uint8_t *)s + p->offset) = value;
2091     return 0;
2092 }
2093
2094
2095 /* set/reset a warning */
2096 int tcc_set_warning(TCCState *s, const char *warning_name, int value)
2097 {
2098     int i;
2099     const FlagDef *p;
2100
2101     if (!strcmp(warning_name, "all")) {
2102         for(i = 0, p = warning_defs; i < countof(warning_defs); i++, p++) {
2103             if (p->flags & WD_ALL)
2104                 *(int *)((uint8_t *)s + p->offset) = 1;
2105         }
2106         return 0;
2107     } else {
2108         return set_flag(s, warning_defs, countof(warning_defs),
2109                         warning_name, value);
2110     }
2111 }
2112
2113 static const FlagDef flag_defs[] = {
2114     { offsetof(TCCState, char_is_unsigned), 0, "unsigned-char" },
2115     { offsetof(TCCState, char_is_unsigned), FD_INVERT, "signed-char" },
2116     { offsetof(TCCState, nocommon), FD_INVERT, "common" },
2117     { offsetof(TCCState, leading_underscore), 0, "leading-underscore" },
2118 };
2119
2120 /* set/reset a flag */
2121 int tcc_set_flag(TCCState *s, const char *flag_name, int value)
2122 {
2123     return set_flag(s, flag_defs, countof(flag_defs),
2124                     flag_name, value);
2125 }
2126
2127 /* set CONFIG_TCCDIR at runtime */
2128 void tcc_set_lib_path(TCCState *s, const char *path)
2129 {
2130     tcc_lib_path = tcc_strdup(path);
2131 }
2132