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 /* display benchmark infos */
  27 int total_lines;
  28 int total_bytes;
  29
  30 /* parser */
  31 static struct BufferedFile *file;
  32 static int ch, tok;
  33 static CValue tokc;
  34 static CString tokcstr; /* current parsed string, if any */
  35 /* additional informations about token */
  36 static int tok_flags;
  37 #define TOK_FLAG_BOL   0x0001 /* beginning of line before */
  38 #define TOK_FLAG_BOF   0x0002 /* beginning of file before */
  39 #define TOK_FLAG_ENDIF 0x0004 /* a endif was found matching starting #ifdef */
  40 #define TOK_FLAG_EOF   0x0008 /* end of file */
  41
  42 static int *macro_ptr, *macro_ptr_allocated;
  43 static int *unget_saved_macro_ptr;
  44 static int unget_saved_buffer[TOK_MAX_SIZE + 1];
  45 static int unget_buffer_enabled;
  46 static int parse_flags;
  47 #define PARSE_FLAG_PREPROCESS 0x0001 /* activate preprocessing */
  48 #define PARSE_FLAG_TOK_NUM    0x0002 /* return numbers instead of TOK_PPNUM */
  49 #define PARSE_FLAG_LINEFEED   0x0004 /* line feed is returned as a
  50                                         token. line feed is also
  51                                         returned at eof */
  52 #define PARSE_FLAG_ASM_COMMENTS 0x0008 /* '#' can be used for line comment */
  53 #define PARSE_FLAG_SPACES     0x0010 /* next() returns space tokens (for -E) */
  54
  55 static Section *text_section, *data_section, *bss_section; /* predefined sections */
  56 static Section *cur_text_section; /* current section where function code is
  57                               generated */
  58 #ifdef CONFIG_TCC_ASM
  59 static Section *last_text_section; /* to handle .previous asm directive */
  60 #endif
  61 /* bound check related sections */
  62 static Section *bounds_section; /* contains global data bound description */
  63 static Section *lbounds_section; /* contains local data bound description */
  64 /* symbol sections */
  65 static Section *symtab_section, *strtab_section;
  66
  67 /* debug sections */
  68 static Section *stab_section, *stabstr_section;
  69
  70 /* loc : local variable index
  71    ind : output code index
  72    rsym: return symbol
  73    anon_sym: anonymous symbol index
  74 */
  75 static int rsym, anon_sym, ind, loc;
  76 /* expression generation modifiers */
  77 static int const_wanted; /* true if constant wanted */
  78 static int nocode_wanted; /* true if no code generation wanted for an expression */
  79 static int global_expr;  /* true if compound literals must be allocated
  80                             globally (used during initializers parsing */
  81 static CType func_vt; /* current function return type (used by return
  82                          instruction) */
  83 static int func_vc;
  84 static int last_line_num, last_ind, func_ind; /* debug last line number and pc */
  85 static int tok_ident;
  86 static TokenSym **table_ident;
  87 static TokenSym *hash_ident[TOK_HASH_SIZE];
  88 static char token_buf[STRING_MAX_SIZE + 1];
  89 static char *funcname;
  90 static Sym *global_stack, *local_stack;
  91 static Sym *define_stack;
  92 static Sym *global_label_stack, *local_label_stack;
  93 /* symbol allocator */
  94 #define SYM_POOL_NB (8192 / sizeof(Sym))
  95 static Sym *sym_free_first;
  96 static void **sym_pools;
  97 static int nb_sym_pools;
  98
  99 static SValue vstack[VSTACK_SIZE], *vtop;
 100 /* some predefined types */
 101 static CType char_pointer_type, func_old_type, int_type;
 102
 103 /* use GNU C extensions */
 104 static int gnu_ext = 1;
 105
 106 /* use Tiny C extensions */
 107 static int tcc_ext = 1;
 108
 109 /* max number of callers shown if error */
 110 #ifdef CONFIG_TCC_BACKTRACE
 111 int num_callers = 6;
 112 const char **rt_bound_error_msg;
 113 unsigned long rt_prog_main;
 114 #endif
 115
 116 /* XXX: get rid of this ASAP */
 117 static struct TCCState *tcc_state;
 118
 119 /********************************************************/
 120 /* function prototypes */
 121
 122 /* tccpp.c */
 123 static void next(void);
 124 char *get_tok_str(int v, CValue *cv);
 125
 126 /* tccgen.c */
 127 static void parse_expr_type(CType *type);
 128 static void expr_type(CType *type);
 129 static void unary_type(CType *type);
 130 static void block(int *bsym, int *csym, int *case_sym, int *def_sym,
 131                   int case_reg, int is_expr);
 132 static int expr_const(void);
 133 static void expr_eq(void);
 134 static void gexpr(void);
 135 static void gen_inline_functions(void);
 136 static void decl(int l);
 137 static void decl_initializer(CType *type, Section *sec, unsigned long c,
 138                              int first, int size_only);
 139 static void decl_initializer_alloc(CType *type, AttributeDef *ad, int r,
 140                                    int has_init, int v, int scope);
 141 int gv(int rc);
 142 void gv2(int rc1, int rc2);
 143 void move_reg(int r, int s);
 144 void save_regs(int n);
 145 void save_reg(int r);
 146 void vpop(void);
 147 void vswap(void);
 148 void vdup(void);
 149 int get_reg(int rc);
 150 int get_reg_ex(int rc,int rc2);
 151
 152 void gen_op(int op);
 153 void force_charshort_cast(int t);
 154 static void gen_cast(CType *type);
 155 void vstore(void);
 156 static Sym *sym_find(int v);
 157 static Sym *sym_push(int v, CType *type, int r, int c);
 158
 159 /* type handling */
 160 static int type_size(CType *type, int *a);
 161 static inline CType *pointed_type(CType *type);
 162 static int pointed_size(CType *type);
 163 static int lvalue_type(int t);
 164 static int parse_btype(CType *type, AttributeDef *ad);
 165 static void type_decl(CType *type, AttributeDef *ad, int *v, int td);
 166 static int compare_types(CType *type1, CType *type2, int unqualified);
 167 static int is_compatible_types(CType *type1, CType *type2);
 168 static int is_compatible_parameter_types(CType *type1, CType *type2);
 169
 170 int ieee_finite(double d);
 171 void vpushi(int v);
 172 void vpushll(long long v);
 173 void vrott(int n);
 174 void vnrott(int n);
 175 void lexpand_nr(void);
 176 static void vpush_global_sym(CType *type, int v);
 177 void vset(CType *type, int r, int v);
 178 void type_to_str(char *buf, int buf_size,
 179                  CType *type, const char *varstr);
 180 static Sym *get_sym_ref(CType *type, Section *sec,
 181                         unsigned long offset, unsigned long size);
 182 static Sym *external_global_sym(int v, CType *type, int r);
 183
 184 /* section generation */
 185 static void section_realloc(Section *sec, unsigned long new_size);
 186 static void *section_ptr_add(Section *sec, unsigned long size);
 187 static void put_extern_sym(Sym *sym, Section *section,
 188                            unsigned long value, unsigned long size);
 189 static void greloc(Section *s, Sym *sym, unsigned long addr, int type);
 190 static int put_elf_str(Section *s, const char *sym);
 191 static int put_elf_sym(Section *s,
 192                        unsigned long value, unsigned long size,
 193                        int info, int other, int shndx, const char *name);
 194 static int add_elf_sym(Section *s, uplong value, unsigned long size,
 195                        int info, int other, int sh_num, const char *name);
 196 static void put_elf_reloc(Section *symtab, Section *s, unsigned long offset,
 197                           int type, int symbol);
 198 static void put_stabs(const char *str, int type, int other, int desc,
 199                       unsigned long value);
 200 static void put_stabs_r(const char *str, int type, int other, int desc,
 201                         unsigned long value, Section *sec, int sym_index);
 202 static void put_stabn(int type, int other, int desc, int value);
 203 static void put_stabd(int type, int other, int desc);
 204 static int tcc_add_dll(TCCState *s, const char *filename, int flags);
 205
 206 #define AFF_PRINT_ERROR     0x0001 /* print error if file not found */
 207 #define AFF_REFERENCED_DLL  0x0002 /* load a referenced dll from another dll */
 208 #define AFF_PREPROCESS      0x0004 /* preprocess file */
 209 static int tcc_add_file_internal(TCCState *s, const char *filename, int flags);
 210
 211 /* tcccoff.c */
 212 int tcc_output_coff(TCCState *s1, FILE *f);
 213
 214 /* tccpe.c */
 215 int pe_load_file(struct TCCState *s1, const char *filename, int fd);
 216 int pe_output_file(struct TCCState *s1, const char *filename);
 217
 218 /* tccasm.c */
 219 #ifdef CONFIG_TCC_ASM
 220 static void asm_expr(TCCState *s1, ExprValue *pe);
 221 static int asm_int_expr(TCCState *s1);
 222 static int find_constraint(ASMOperand *operands, int nb_operands,
 223                            const char *name, const char **pp);
 224
 225 static int tcc_assemble(TCCState *s1, int do_preprocess);
 226 #endif
 227
 228 static void asm_instr(void);
 229 static void asm_global_instr(void);
 230
 231 /********************************************************/
 232 /* libtcc.c */
 233
 234 static Sym *__sym_malloc(void);
 235 static inline Sym *sym_malloc(void);
 236 static inline void sym_free(Sym *sym);
 237 Section *new_section(TCCState *s1, const char *name, int sh_type, int sh_flags);
 238 static void free_section(Section *s);
 239 static void section_realloc(Section *sec, unsigned long new_size);
 240 static void *section_ptr_add(Section *sec, unsigned long size);
 241 Section *find_section(TCCState *s1, const char *name);
 242 static void put_extern_sym2(
 243     Sym *sym, Section *section,
 244     unsigned long value, unsigned long size, int can_add_underscore);
 245 static void put_extern_sym(
 246     Sym *sym, Section *section,
 247     unsigned long value, unsigned long size);
 248 static void greloc(Section *s, Sym *sym, unsigned long offset, int type);
 249
 250 static void strcat_vprintf(char *buf, int buf_size, const char *fmt, va_list ap);
 251 static void strcat_printf(char *buf, int buf_size, const char *fmt, ...);
 252
 253 /* CString handling */
 254 static void cstr_realloc(CString *cstr, int new_size);
 255 static inline void cstr_ccat(CString *cstr, int ch);
 256 static void cstr_cat(CString *cstr, const char *str);
 257 static void cstr_wccat(CString *cstr, int ch);
 258 static void cstr_new(CString *cstr);
 259 static void cstr_free(CString *cstr);
 260 #define cstr_reset(cstr) cstr_free(cstr)
 261 static void add_char(CString *cstr, int c);
 262
 263 static Sym *sym_push2(Sym **ps, int v, int t, long c);
 264 static Sym *sym_find2(Sym *s, int v);
 265 static inline Sym *struct_find(int v);
 266 static inline Sym *sym_find(int v);
 267 static Sym *sym_push(int v, CType *type, int r, int c);
 268 static Sym *global_identifier_push(int v, int t, int c);
 269 static void sym_pop(Sym **ptop, Sym *b);
 270
 271 BufferedFile *tcc_open(TCCState *s1, const char *filename);
 272 void tcc_close(BufferedFile *bf);
 273 static int tcc_compile(TCCState *s1);
 274
 275 void expect(const char *msg);
 276 void skip(int c);
 277 static void test_lvalue(void);
 278 void *resolve_sym(TCCState *s1, const char *sym);
 279
 280 static inline int isid(int c)
 281 {
 282     return (c >= 'a' && c <= 'z')
 283         || (c >= 'A' && c <= 'Z')
 284         || c == '_';
 285 }
 286
 287 static inline int isnum(int c)
 288 {
 289     return c >= '0' && c <= '9';
 290 }
 291
 292 static inline int isoct(int c)
 293 {
 294     return c >= '0' && c <= '7';
 295 }
 296
 297 static inline int toup(int c)
 298 {
 299     if (c >= 'a' && c <= 'z')
 300         return c - 'a' + 'A';
 301     else
 302         return c;
 303 }
 304
 305 /********************************************************/
 306
 307 #ifdef TCC_TARGET_I386
 308 #include "i386-gen.c"
 309 #endif
 310
 311 #ifdef TCC_TARGET_ARM
 312 #include "arm-gen.c"
 313 #endif
 314
 315 #ifdef TCC_TARGET_C67
 316 #include "c67-gen.c"
 317 #endif
 318
 319 #ifdef TCC_TARGET_X86_64
 320 #include "x86_64-gen.c"
 321 #endif
 322
 323 #include "tccpp.c"
 324 #include "tccgen.c"
 325
 326 #ifdef CONFIG_TCC_ASM
 327 #ifdef TCC_TARGET_I386
 328 #include "i386-asm.c"
 329 #endif
 330 #include "tccasm.c"
 331 #else
 332 static void asm_instr(void)
 333 {
 334     error("inline asm() not supported");
 335 }
 336 static void asm_global_instr(void)
 337 {
 338     error("inline asm() not supported");
 339 }
 340 #endif
 341
 342 #include "tccelf.c"
 343
 344 #ifdef TCC_TARGET_COFF
 345 #include "tcccoff.c"
 346 #endif
 347
 348 #ifdef TCC_TARGET_PE
 349 #include "tccpe.c"
 350 #endif
 351
 352 /********************************************************/
 353 #ifdef _WIN32
 354 char *normalize_slashes(char *path)
 355 {
 356     char *p;
 357     for (p = path; *p; ++p)
 358         if (*p == '\\')
 359             *p = '/';
 360     return path;
 361 }
 362
 363 HMODULE tcc_module;
 364
 365 /* on win32, we suppose the lib and includes are at the location of 'tcc.exe' */
 366 void tcc_set_lib_path_w32(TCCState *s)
 367 {
 368     char path[1024], *p;
 369     GetModuleFileNameA(tcc_module, path, sizeof path);
 370     p = tcc_basename(normalize_slashes(strlwr(path)));
 371     if (p - 5 > path && 0 == strncmp(p - 5, "/bin/", 5))
 372         p -= 5;
 373     else if (p > path)
 374         p--;
 375     *p = 0;
 376     tcc_set_lib_path(s, path);
 377 }
 378
 379 #ifdef LIBTCC_AS_DLL
 380 BOOL WINAPI DllMain (HANDLE hDll, DWORD dwReason, LPVOID lpReserved)
 381 {
 382     if (DLL_PROCESS_ATTACH == dwReason)
 383         tcc_module = hDll;
 384     return TRUE;
 385 }
 386 #endif
 387 #endif
 388
 389 /********************************************************/
 390 #ifdef CONFIG_TCC_STATIC
 391
 392 #define RTLD_LAZY       0x001
 393 #define RTLD_NOW        0x002
 394 #define RTLD_GLOBAL     0x100
 395 #define RTLD_DEFAULT    NULL
 396
 397 /* dummy function for profiling */
 398 void *dlopen(const char *filename, int flag)
 399 {
 400     return NULL;
 401 }
 402
 403 void dlclose(void *p)
 404 {
 405 }
 406
 407 const char *dlerror(void)
 408 {
 409     return "error";
 410 }
 411
 412 typedef struct TCCSyms {
 413     char *str;
 414     void *ptr;
 415 } TCCSyms;
 416
 417 #define TCCSYM(a) { #a, &a, },
 418
 419 /* add the symbol you want here if no dynamic linking is done */
 420 static TCCSyms tcc_syms[] = {
 421 #if !defined(CONFIG_TCCBOOT)
 422     TCCSYM(printf)
 423     TCCSYM(fprintf)
 424     TCCSYM(fopen)
 425     TCCSYM(fclose)
 426 #endif
 427     { NULL, NULL },
 428 };
 429
 430 void *resolve_sym(TCCState *s1, const char *symbol)
 431 {
 432     TCCSyms *p;
 433     p = tcc_syms;
 434     while (p->str != NULL) {
 435         if (!strcmp(p->str, symbol))
 436             return p->ptr;
 437         p++;
 438     }
 439     return NULL;
 440 }
 441
 442 #elif defined(_WIN32)
 443 #define dlclose FreeLibrary
 444
 445 #else
 446 #include <dlfcn.h>
 447
 448 void *resolve_sym(TCCState *s1, const char *sym)
 449 {
 450     return dlsym(RTLD_DEFAULT, sym);
 451 }
 452
 453 #endif
 454
 455 /********************************************************/
 456
 457 /* we use our own 'finite' function to avoid potential problems with
 458    non standard math libs */
 459 /* XXX: endianness dependent */
 460 int ieee_finite(double d)
 461 {
 462     int *p = (int *)&d;
 463     return ((unsigned)((p[1] | 0x800fffff) + 1)) >> 31;
 464 }
 465
 466 /* copy a string and truncate it. */
 467 char *pstrcpy(char *buf, int buf_size, const char *s)
 468 {
 469     char *q, *q_end;
 470     int c;
 471
 472     if (buf_size > 0) {
 473         q = buf;
 474         q_end = buf + buf_size - 1;
 475         while (q < q_end) {
 476             c = *s++;
 477             if (c == '\0')
 478                 break;
 479             *q++ = c;
 480         }
 481         *q = '\0';
 482     }
 483     return buf;
 484 }
 485
 486 /* strcat and truncate. */
 487 char *pstrcat(char *buf, int buf_size, const char *s)
 488 {
 489     int len;
 490     len = strlen(buf);
 491     if (len < buf_size)
 492         pstrcpy(buf + len, buf_size - len, s);
 493     return buf;
 494 }
 495
 496 /* extract the basename of a file */
 497 char *tcc_basename(const char *name)
 498 {
 499     char *p = strchr(name, 0);
 500     while (p > name && !IS_PATHSEP(p[-1]))
 501         --p;
 502     return p;
 503 }
 504
 505 char *tcc_fileextension (const char *name)
 506 {
 507     char *b = tcc_basename(name);
 508     char *e = strrchr(b, '.');
 509     return e ? e : strchr(b, 0);
 510 }
 511
 512 void set_pages_executable(void *ptr, unsigned long length)
 513 {
 514 #ifdef _WIN32
 515     unsigned long old_protect;
 516     VirtualProtect(ptr, length, PAGE_EXECUTE_READWRITE, &old_protect);
 517 #else
 518     unsigned long start, end;
 519     start = (unsigned long)ptr & ~(PAGESIZE - 1);
 520     end = (unsigned long)ptr + length;
 521     end = (end + PAGESIZE - 1) & ~(PAGESIZE - 1);
 522     mprotect((void *)start, end - start, PROT_READ | PROT_WRITE | PROT_EXEC);
 523 #endif
 524 }
 525
 526 /* memory management */
 527 #ifdef MEM_DEBUG
 528 int mem_cur_size;
 529 int mem_max_size;
 530 unsigned malloc_usable_size(void*);
 531 #endif
 532
 533 void tcc_free(void *ptr)
 534 {
 535 #ifdef MEM_DEBUG
 536     mem_cur_size -= malloc_usable_size(ptr);
 537 #endif
 538     free(ptr);
 539 }
 540
 541 void *tcc_malloc(unsigned long size)
 542 {
 543     void *ptr;
 544     ptr = malloc(size);
 545     if (!ptr && size)
 546         error("memory full");
 547 #ifdef MEM_DEBUG
 548     mem_cur_size += malloc_usable_size(ptr);
 549     if (mem_cur_size > mem_max_size)
 550         mem_max_size = mem_cur_size;
 551 #endif
 552     return ptr;
 553 }
 554
 555 void *tcc_mallocz(unsigned long size)
 556 {
 557     void *ptr;
 558     ptr = tcc_malloc(size);
 559     memset(ptr, 0, size);
 560     return ptr;
 561 }
 562
 563 void *tcc_realloc(void *ptr, unsigned long size)
 564 {
 565     void *ptr1;
 566 #ifdef MEM_DEBUG
 567     mem_cur_size -= malloc_usable_size(ptr);
 568 #endif
 569     ptr1 = realloc(ptr, size);
 570 #ifdef MEM_DEBUG
 571     /* NOTE: count not correct if alloc error, but not critical */
 572     mem_cur_size += malloc_usable_size(ptr1);
 573     if (mem_cur_size > mem_max_size)
 574         mem_max_size = mem_cur_size;
 575 #endif
 576     return ptr1;
 577 }
 578
 579 char *tcc_strdup(const char *str)
 580 {
 581     char *ptr;
 582     ptr = tcc_malloc(strlen(str) + 1);
 583     strcpy(ptr, str);
 584     return ptr;
 585 }
 586
 587 #define free(p) use_tcc_free(p)
 588 #define malloc(s) use_tcc_malloc(s)
 589 #define realloc(p, s) use_tcc_realloc(p, s)
 590
 591 void dynarray_add(void ***ptab, int *nb_ptr, void *data)
 592 {
 593     int nb, nb_alloc;
 594     void **pp;
 595
 596     nb = *nb_ptr;
 597     pp = *ptab;
 598     /* every power of two we double array size */
 599     if ((nb & (nb - 1)) == 0) {
 600         if (!nb)
 601             nb_alloc = 1;
 602         else
 603             nb_alloc = nb * 2;
 604         pp = tcc_realloc(pp, nb_alloc * sizeof(void *));
 605         if (!pp)
 606             error("memory full");
 607         *ptab = pp;
 608     }
 609     pp[nb++] = data;
 610     *nb_ptr = nb;
 611 }
 612
 613 void dynarray_reset(void *pp, int *n)
 614 {
 615     void **p;
 616     for (p = *(void***)pp; *n; ++p, --*n)
 617         if (*p)
 618             tcc_free(*p);
 619     tcc_free(*(void**)pp);
 620     *(void**)pp = NULL;
 621 }
 622
 623 /* symbol allocator */
 624 static Sym *__sym_malloc(void)
 625 {
 626     Sym *sym_pool, *sym, *last_sym;
 627     int i;
 628
 629     sym_pool = tcc_malloc(SYM_POOL_NB * sizeof(Sym));
 630     dynarray_add(&sym_pools, &nb_sym_pools, sym_pool);
 631
 632     last_sym = sym_free_first;
 633     sym = sym_pool;
 634     for(i = 0; i < SYM_POOL_NB; i++) {
 635         sym->next = last_sym;
 636         last_sym = sym;
 637         sym++;
 638     }
 639     sym_free_first = last_sym;
 640     return last_sym;
 641 }
 642
 643 static inline Sym *sym_malloc(void)
 644 {
 645     Sym *sym;
 646     sym = sym_free_first;
 647     if (!sym)
 648         sym = __sym_malloc();
 649     sym_free_first = sym->next;
 650     return sym;
 651 }
 652
 653 static inline void sym_free(Sym *sym)
 654 {
 655     sym->next = sym_free_first;
 656     sym_free_first = sym;
 657 }
 658
 659 Section *new_section(TCCState *s1, const char *name, int sh_type, int sh_flags)
 660 {
 661     Section *sec;
 662
 663     sec = tcc_mallocz(sizeof(Section) + strlen(name));
 664     strcpy(sec->name, name);
 665     sec->sh_type = sh_type;
 666     sec->sh_flags = sh_flags;
 667     switch(sh_type) {
 668     case SHT_HASH:
 669     case SHT_REL:
 670     case SHT_RELA:
 671     case SHT_DYNSYM:
 672     case SHT_SYMTAB:
 673     case SHT_DYNAMIC:
 674         sec->sh_addralign = 4;
 675         break;
 676     case SHT_STRTAB:
 677         sec->sh_addralign = 1;
 678         break;
 679     default:
 680         sec->sh_addralign = 32; /* default conservative alignment */
 681         break;
 682     }
 683
 684     if (sh_flags & SHF_PRIVATE) {
 685         dynarray_add((void ***)&s1->priv_sections, &s1->nb_priv_sections, sec);
 686     } else {
 687         sec->sh_num = s1->nb_sections;
 688         dynarray_add((void ***)&s1->sections, &s1->nb_sections, sec);
 689     }
 690
 691     return sec;
 692 }
 693
 694 static void free_section(Section *s)
 695 {
 696     tcc_free(s->data);
 697 }
 698
 699 /* realloc section and set its content to zero */
 700 static void section_realloc(Section *sec, unsigned long new_size)
 701 {
 702     unsigned long size;
 703     unsigned char *data;
 704
 705     size = sec->data_allocated;
 706     if (size == 0)
 707         size = 1;
 708     while (size < new_size)
 709         size = size * 2;
 710     data = tcc_realloc(sec->data, size);
 711     if (!data)
 712         error("memory full");
 713     memset(data + sec->data_allocated, 0, size - sec->data_allocated);
 714     sec->data = data;
 715     sec->data_allocated = size;
 716 }
 717
 718 /* reserve at least 'size' bytes in section 'sec' from
 719    sec->data_offset. */
 720 static void *section_ptr_add(Section *sec, unsigned long size)
 721 {
 722     unsigned long offset, offset1;
 723
 724     offset = sec->data_offset;
 725     offset1 = offset + size;
 726     if (offset1 > sec->data_allocated)
 727         section_realloc(sec, offset1);
 728     sec->data_offset = offset1;
 729     return sec->data + offset;
 730 }
 731
 732 /* return a reference to a section, and create it if it does not
 733    exists */
 734 Section *find_section(TCCState *s1, const char *name)
 735 {
 736     Section *sec;
 737     int i;
 738     for(i = 1; i < s1->nb_sections; i++) {
 739         sec = s1->sections[i];
 740         if (!strcmp(name, sec->name))
 741             return sec;
 742     }
 743     /* sections are created as PROGBITS */
 744     return new_section(s1, name, SHT_PROGBITS, SHF_ALLOC);
 745 }
 746
 747 /* update sym->c so that it points to an external symbol in section
 748    'section' with value 'value' */
 749 static void put_extern_sym2(Sym *sym, Section *section,
 750                             unsigned long value, unsigned long size,
 751                             int can_add_underscore)
 752 {
 753     int sym_type, sym_bind, sh_num, info, other, attr;
 754     ElfW(Sym) *esym;
 755     const char *name;
 756     char buf1[256];
 757
 758     if (section == NULL)
 759         sh_num = SHN_UNDEF;
 760     else if (section == SECTION_ABS)
 761         sh_num = SHN_ABS;
 762     else
 763         sh_num = section->sh_num;
 764
 765     other = attr = 0;
 766
 767     if ((sym->type.t & VT_BTYPE) == VT_FUNC) {
 768         sym_type = STT_FUNC;
 769 #ifdef TCC_TARGET_PE
 770         if (sym->type.ref)
 771             attr = sym->type.ref->r;
 772         if (FUNC_EXPORT(attr))
 773             other |= 1;
 774         if (FUNC_CALL(attr) == FUNC_STDCALL)
 775             other |= 2;
 776 #endif
 777     } else {
 778         sym_type = STT_OBJECT;
 779     }
 780
 781     if (sym->type.t & VT_STATIC)
 782         sym_bind = STB_LOCAL;
 783     else
 784         sym_bind = STB_GLOBAL;
 785
 786     if (!sym->c) {
 787         name = get_tok_str(sym->v, NULL);
 788 #ifdef CONFIG_TCC_BCHECK
 789         if (tcc_state->do_bounds_check) {
 790             char buf[32];
 791
 792             /* XXX: avoid doing that for statics ? */
 793             /* if bound checking is activated, we change some function
 794                names by adding the "__bound" prefix */
 795             switch(sym->v) {
 796 #if 0
 797             /* XXX: we rely only on malloc hooks */
 798             case TOK_malloc:
 799             case TOK_free:
 800             case TOK_realloc:
 801             case TOK_memalign:
 802             case TOK_calloc:
 803 #endif
 804             case TOK_memcpy:
 805             case TOK_memmove:
 806             case TOK_memset:
 807             case TOK_strlen:
 808             case TOK_strcpy:
 809             case TOK_alloca:
 810                 strcpy(buf, "__bound_");
 811                 strcat(buf, name);
 812                 name = buf;
 813                 break;
 814             }
 815         }
 816 #endif
 817
 818 #ifdef TCC_TARGET_PE
 819         if ((other & 2) && can_add_underscore) {
 820             sprintf(buf1, "_%s@%d", name, FUNC_ARGS(attr));
 821             name = buf1;
 822         } else
 823 #endif
 824         if (tcc_state->leading_underscore && can_add_underscore) {
 825             buf1[0] = '_';
 826             pstrcpy(buf1 + 1, sizeof(buf1) - 1, name);
 827             name = buf1;
 828         }
 829         info = ELFW(ST_INFO)(sym_bind, sym_type);
 830         sym->c = add_elf_sym(symtab_section, value, size, info, other, sh_num, name);
 831     } else {
 832         esym = &((ElfW(Sym) *)symtab_section->data)[sym->c];
 833         esym->st_value = value;
 834         esym->st_size = size;
 835         esym->st_shndx = sh_num;
 836         esym->st_other |= other;
 837     }
 838 }
 839
 840 static void put_extern_sym(Sym *sym, Section *section,
 841                            unsigned long value, unsigned long size)
 842 {
 843     put_extern_sym2(sym, section, value, size, 1);
 844 }
 845
 846 /* add a new relocation entry to symbol 'sym' in section 's' */
 847 static void greloc(Section *s, Sym *sym, unsigned long offset, int type)
 848 {
 849     if (!sym->c)
 850         put_extern_sym(sym, NULL, 0, 0);
 851     /* now we can add ELF relocation info */
 852     put_elf_reloc(symtab_section, s, offset, type, sym->c);
 853 }
 854
 855 static void strcat_vprintf(char *buf, int buf_size, const char *fmt, va_list ap)
 856 {
 857     int len;
 858     len = strlen(buf);
 859     vsnprintf(buf + len, buf_size - len, fmt, ap);
 860 }
 861
 862 static void strcat_printf(char *buf, int buf_size, const char *fmt, ...)
 863 {
 864     va_list ap;
 865     va_start(ap, fmt);
 866     strcat_vprintf(buf, buf_size, fmt, ap);
 867     va_end(ap);
 868 }
 869
 870 void error1(TCCState *s1, int is_warning, const char *fmt, va_list ap)
 871 {
 872     char buf[2048];
 873     BufferedFile **f;
 874
 875     buf[0] = '\0';
 876     if (file) {
 877         for(f = s1->include_stack; f < s1->include_stack_ptr; f++)
 878             strcat_printf(buf, sizeof(buf), "In file included from %s:%d:\n",
 879                           (*f)->filename, (*f)->line_num);
 880         if (file->line_num > 0) {
 881             strcat_printf(buf, sizeof(buf),
 882                           "%s:%d: ", file->filename, file->line_num);
 883         } else {
 884             strcat_printf(buf, sizeof(buf),
 885                           "%s: ", file->filename);
 886         }
 887     } else {
 888         strcat_printf(buf, sizeof(buf),
 889                       "tcc: ");
 890     }
 891     if (is_warning)
 892         strcat_printf(buf, sizeof(buf), "warning: ");
 893     else
 894         strcat_printf(buf, sizeof(buf), "error: ");
 895     strcat_vprintf(buf, sizeof(buf), fmt, ap);
 896
 897     if (!s1->error_func) {
 898         /* default case: stderr */
 899         fprintf(stderr, "%s\n", buf);
 900     } else {
 901         s1->error_func(s1->error_opaque, buf);
 902     }
 903     if (!is_warning || s1->warn_error)
 904         s1->nb_errors++;
 905 }
 906
 907 void tcc_set_error_func(TCCState *s, void *error_opaque,
 908                         void (*error_func)(void *opaque, const char *msg))
 909 {
 910     s->error_opaque = error_opaque;
 911     s->error_func = error_func;
 912 }
 913
 914 /* error without aborting current compilation */
 915 void error_noabort(const char *fmt, ...)
 916 {
 917     TCCState *s1 = tcc_state;
 918     va_list ap;
 919
 920     va_start(ap, fmt);
 921     error1(s1, 0, fmt, ap);
 922     va_end(ap);
 923 }
 924
 925 void error(const char *fmt, ...)
 926 {
 927     TCCState *s1 = tcc_state;
 928     va_list ap;
 929
 930     va_start(ap, fmt);
 931     error1(s1, 0, fmt, ap);
 932     va_end(ap);
 933     /* better than nothing: in some cases, we accept to handle errors */
 934     if (s1->error_set_jmp_enabled) {
 935         longjmp(s1->error_jmp_buf, 1);
 936     } else {
 937         /* XXX: eliminate this someday */
 938         exit(1);
 939     }
 940 }
 941
 942 void expect(const char *msg)
 943 {
 944     error("%s expected", msg);
 945 }
 946
 947 void warning(const char *fmt, ...)
 948 {
 949     TCCState *s1 = tcc_state;
 950     va_list ap;
 951
 952     if (s1->warn_none)
 953         return;
 954
 955     va_start(ap, fmt);
 956     error1(s1, 1, fmt, ap);
 957     va_end(ap);
 958 }
 959
 960 void skip(int c)
 961 {
 962     if (tok != c)
 963         error("'%c' expected", c);
 964     next();
 965 }
 966
 967 static void test_lvalue(void)
 968 {
 969     if (!(vtop->r & VT_LVAL))
 970         expect("lvalue");
 971 }
 972
 973 /* CString handling */
 974
 975 static void cstr_realloc(CString *cstr, int new_size)
 976 {
 977     int size;
 978     void *data;
 979
 980     size = cstr->size_allocated;
 981     if (size == 0)
 982         size = 8; /* no need to allocate a too small first string */
 983     while (size < new_size)
 984         size = size * 2;
 985     data = tcc_realloc(cstr->data_allocated, size);
 986     if (!data)
 987         error("memory full");
 988     cstr->data_allocated = data;
 989     cstr->size_allocated = size;
 990     cstr->data = data;
 991 }
 992
 993 /* add a byte */
 994 static inline void cstr_ccat(CString *cstr, int ch)
 995 {
 996     int size;
 997     size = cstr->size + 1;
 998     if (size > cstr->size_allocated)
 999         cstr_realloc(cstr, size);
1000     ((unsigned char *)cstr->data)[size - 1] = ch;
1001     cstr->size = size;
1002 }
1003
1004 static void cstr_cat(CString *cstr, const char *str)
1005 {
1006     int c;
1007     for(;;) {
1008         c = *str;
1009         if (c == '\0')
1010             break;
1011         cstr_ccat(cstr, c);
1012         str++;
1013     }
1014 }
1015
1016 /* add a wide char */
1017 static void cstr_wccat(CString *cstr, int ch)
1018 {
1019     int size;
1020     size = cstr->size + sizeof(nwchar_t);
1021     if (size > cstr->size_allocated)
1022         cstr_realloc(cstr, size);
1023     *(nwchar_t *)(((unsigned char *)cstr->data) + size - sizeof(nwchar_t)) = ch;
1024     cstr->size = size;
1025 }
1026
1027 static void cstr_new(CString *cstr)
1028 {
1029     memset(cstr, 0, sizeof(CString));
1030 }
1031
1032 /* free string and reset it to NULL */
1033 static void cstr_free(CString *cstr)
1034 {
1035     tcc_free(cstr->data_allocated);
1036     cstr_new(cstr);
1037 }
1038
1039 #define cstr_reset(cstr) cstr_free(cstr)
1040
1041 /* XXX: unicode ? */
1042 static void add_char(CString *cstr, int c)
1043 {
1044     if (c == '\'' || c == '\"' || c == '\\') {
1045         /* XXX: could be more precise if char or string */
1046         cstr_ccat(cstr, '\\');
1047     }
1048     if (c >= 32 && c <= 126) {
1049         cstr_ccat(cstr, c);
1050     } else {
1051         cstr_ccat(cstr, '\\');
1052         if (c == '\n') {
1053             cstr_ccat(cstr, 'n');
1054         } else {
1055             cstr_ccat(cstr, '0' + ((c >> 6) & 7));
1056             cstr_ccat(cstr, '0' + ((c >> 3) & 7));
1057             cstr_ccat(cstr, '0' + (c & 7));
1058         }
1059     }
1060 }
1061
1062 /* push, without hashing */
1063 static Sym *sym_push2(Sym **ps, int v, int t, long c)
1064 {
1065     Sym *s;
1066     s = sym_malloc();
1067     s->v = v;
1068     s->type.t = t;
1069 #ifdef _WIN64
1070     s->d = NULL;
1071 #endif
1072     s->c = c;
1073     s->next = NULL;
1074     /* add in stack */
1075     s->prev = *ps;
1076     *ps = s;
1077     return s;
1078 }
1079
1080 /* find a symbol and return its associated structure. 's' is the top
1081    of the symbol stack */
1082 static Sym *sym_find2(Sym *s, int v)
1083 {
1084     while (s) {
1085         if (s->v == v)
1086             return s;
1087         s = s->prev;
1088     }
1089     return NULL;
1090 }
1091
1092 /* structure lookup */
1093 static inline Sym *struct_find(int v)
1094 {
1095     v -= TOK_IDENT;
1096     if ((unsigned)v >= (unsigned)(tok_ident - TOK_IDENT))
1097         return NULL;
1098     return table_ident[v]->sym_struct;
1099 }
1100
1101 /* find an identifier */
1102 static inline Sym *sym_find(int v)
1103 {
1104     v -= TOK_IDENT;
1105     if ((unsigned)v >= (unsigned)(tok_ident - TOK_IDENT))
1106         return NULL;
1107     return table_ident[v]->sym_identifier;
1108 }
1109
1110 /* push a given symbol on the symbol stack */
1111 static Sym *sym_push(int v, CType *type, int r, int c)
1112 {
1113     Sym *s, **ps;
1114     TokenSym *ts;
1115
1116     if (local_stack)
1117         ps = &local_stack;
1118     else
1119         ps = &global_stack;
1120     s = sym_push2(ps, v, type->t, c);
1121     s->type.ref = type->ref;
1122     s->r = r;
1123     /* don't record fields or anonymous symbols */
1124     /* XXX: simplify */
1125     if (!(v & SYM_FIELD) && (v & ~SYM_STRUCT) < SYM_FIRST_ANOM) {
1126         /* record symbol in token array */
1127         ts = table_ident[(v & ~SYM_STRUCT) - TOK_IDENT];
1128         if (v & SYM_STRUCT)
1129             ps = &ts->sym_struct;
1130         else
1131             ps = &ts->sym_identifier;
1132         s->prev_tok = *ps;
1133         *ps = s;
1134     }
1135     return s;
1136 }
1137
1138 /* push a global identifier */
1139 static Sym *global_identifier_push(int v, int t, int c)
1140 {
1141     Sym *s, **ps;
1142     s = sym_push2(&global_stack, v, t, c);
1143     /* don't record anonymous symbol */
1144     if (v < SYM_FIRST_ANOM) {
1145         ps = &table_ident[v - TOK_IDENT]->sym_identifier;
1146         /* modify the top most local identifier, so that
1147            sym_identifier will point to 's' when popped */
1148         while (*ps != NULL)
1149             ps = &(*ps)->prev_tok;
1150         s->prev_tok = NULL;
1151         *ps = s;
1152     }
1153     return s;
1154 }
1155
1156 /* pop symbols until top reaches 'b' */
1157 static void sym_pop(Sym **ptop, Sym *b)
1158 {
1159     Sym *s, *ss, **ps;
1160     TokenSym *ts;
1161     int v;
1162
1163     s = *ptop;
1164     while(s != b) {
1165         ss = s->prev;
1166         v = s->v;
1167         /* remove symbol in token array */
1168         /* XXX: simplify */
1169         if (!(v & SYM_FIELD) && (v & ~SYM_STRUCT) < SYM_FIRST_ANOM) {
1170             ts = table_ident[(v & ~SYM_STRUCT) - TOK_IDENT];
1171             if (v & SYM_STRUCT)
1172                 ps = &ts->sym_struct;
1173             else
1174                 ps = &ts->sym_identifier;
1175             *ps = s->prev_tok;
1176         }
1177         sym_free(s);
1178         s = ss;
1179     }
1180     *ptop = b;
1181 }
1182
1183 /* I/O layer */
1184
1185 BufferedFile *tcc_open(TCCState *s1, const char *filename)
1186 {
1187     int fd;
1188     BufferedFile *bf;
1189
1190     if (strcmp(filename, "-") == 0)
1191         fd = 0, filename = "stdin";
1192     else
1193         fd = open(filename, O_RDONLY | O_BINARY);
1194     if ((s1->verbose == 2 && fd >= 0) || s1->verbose == 3)
1195         printf("%s %*s%s\n", fd < 0 ? "nf":"->",
1196                (int)(s1->include_stack_ptr - s1->include_stack), "", filename);
1197     if (fd < 0)
1198         return NULL;
1199     bf = tcc_malloc(sizeof(BufferedFile));
1200     bf->fd = fd;
1201     bf->buf_ptr = bf->buffer;
1202     bf->buf_end = bf->buffer;
1203     bf->buffer[0] = CH_EOB; /* put eob symbol */
1204     pstrcpy(bf->filename, sizeof(bf->filename), filename);
1205 #ifdef _WIN32
1206     normalize_slashes(bf->filename);
1207 #endif
1208     bf->line_num = 1;
1209     bf->ifndef_macro = 0;
1210     bf->ifdef_stack_ptr = s1->ifdef_stack_ptr;
1211     //    printf("opening '%s'\n", filename);
1212     return bf;
1213 }
1214
1215 void tcc_close(BufferedFile *bf)
1216 {
1217     total_lines += bf->line_num;
1218     close(bf->fd);
1219     tcc_free(bf);
1220 }
1221
1222 /* compile the C file opened in 'file'. Return non zero if errors. */
1223 static int tcc_compile(TCCState *s1)
1224 {
1225     Sym *define_start;
1226     char buf[512];
1227     volatile int section_sym;
1228
1229 #ifdef INC_DEBUG
1230     printf("%s: **** new file\n", file->filename);
1231 #endif
1232     preprocess_init(s1);
1233
1234     cur_text_section = NULL;
1235     funcname = "";
1236     anon_sym = SYM_FIRST_ANOM;
1237
1238     /* file info: full path + filename */
1239     section_sym = 0; /* avoid warning */
1240     if (s1->do_debug) {
1241         section_sym = put_elf_sym(symtab_section, 0, 0,
1242                                   ELFW(ST_INFO)(STB_LOCAL, STT_SECTION), 0,
1243                                   text_section->sh_num, NULL);
1244         getcwd(buf, sizeof(buf));
1245 #ifdef _WIN32
1246         normalize_slashes(buf);
1247 #endif
1248         pstrcat(buf, sizeof(buf), "/");
1249         put_stabs_r(buf, N_SO, 0, 0,
1250                     text_section->data_offset, text_section, section_sym);
1251         put_stabs_r(file->filename, N_SO, 0, 0,
1252                     text_section->data_offset, text_section, section_sym);
1253     }
1254     /* an elf symbol of type STT_FILE must be put so that STB_LOCAL
1255        symbols can be safely used */
1256     put_elf_sym(symtab_section, 0, 0,
1257                 ELFW(ST_INFO)(STB_LOCAL, STT_FILE), 0,
1258                 SHN_ABS, file->filename);
1259
1260     /* define some often used types */
1261     int_type.t = VT_INT;
1262
1263     char_pointer_type.t = VT_BYTE;
1264     mk_pointer(&char_pointer_type);
1265
1266     func_old_type.t = VT_FUNC;
1267     func_old_type.ref = sym_push(SYM_FIELD, &int_type, FUNC_CDECL, FUNC_OLD);
1268
1269 #if defined(TCC_ARM_EABI) && defined(TCC_ARM_VFP)
1270     float_type.t = VT_FLOAT;
1271     double_type.t = VT_DOUBLE;
1272
1273     func_float_type.t = VT_FUNC;
1274     func_float_type.ref = sym_push(SYM_FIELD, &float_type, FUNC_CDECL, FUNC_OLD);
1275     func_double_type.t = VT_FUNC;
1276     func_double_type.ref = sym_push(SYM_FIELD, &double_type, FUNC_CDECL, FUNC_OLD);
1277 #endif
1278
1279 #if 0
1280     /* define 'void *alloca(unsigned int)' builtin function */
1281     {
1282         Sym *s1;
1283
1284         p = anon_sym++;
1285         sym = sym_push(p, mk_pointer(VT_VOID), FUNC_CDECL, FUNC_NEW);
1286         s1 = sym_push(SYM_FIELD, VT_UNSIGNED | VT_INT, 0, 0);
1287         s1->next = NULL;
1288         sym->next = s1;
1289         sym_push(TOK_alloca, VT_FUNC | (p << VT_STRUCT_SHIFT), VT_CONST, 0);
1290     }
1291 #endif
1292
1293     define_start = define_stack;
1294     nocode_wanted = 1;
1295
1296     if (setjmp(s1->error_jmp_buf) == 0) {
1297         s1->nb_errors = 0;
1298         s1->error_set_jmp_enabled = 1;
1299
1300         ch = file->buf_ptr[0];
1301         tok_flags = TOK_FLAG_BOL | TOK_FLAG_BOF;
1302         parse_flags = PARSE_FLAG_PREPROCESS | PARSE_FLAG_TOK_NUM;
1303         next();
1304         decl(VT_CONST);
1305         if (tok != TOK_EOF)
1306             expect("declaration");
1307
1308         /* end of translation unit info */
1309         if (s1->do_debug) {
1310             put_stabs_r(NULL, N_SO, 0, 0,
1311                         text_section->data_offset, text_section, section_sym);
1312         }
1313     }
1314     s1->error_set_jmp_enabled = 0;
1315
1316     /* reset define stack, but leave -Dsymbols (may be incorrect if
1317        they are undefined) */
1318     free_defines(define_start);
1319
1320     gen_inline_functions();
1321
1322     sym_pop(&global_stack, NULL);
1323     sym_pop(&local_stack, NULL);
1324
1325     return s1->nb_errors != 0 ? -1 : 0;
1326 }
1327
1328 int tcc_compile_string(TCCState *s, const char *str)
1329 {
1330     BufferedFile bf1, *bf = &bf1;
1331     int ret, len;
1332     char *buf;
1333
1334     /* init file structure */
1335     bf->fd = -1;
1336     /* XXX: avoid copying */
1337     len = strlen(str);
1338     buf = tcc_malloc(len + 1);
1339     if (!buf)
1340         return -1;
1341     memcpy(buf, str, len);
1342     buf[len] = CH_EOB;
1343     bf->buf_ptr = buf;
1344     bf->buf_end = buf + len;
1345     pstrcpy(bf->filename, sizeof(bf->filename), "<string>");
1346     bf->line_num = 1;
1347     file = bf;
1348     ret = tcc_compile(s);
1349     file = NULL;
1350     tcc_free(buf);
1351
1352     /* currently, no need to close */
1353     return ret;
1354 }
1355
1356 /* define a preprocessor symbol. A value can also be provided with the '=' operator */
1357 void tcc_define_symbol(TCCState *s1, const char *sym, const char *value)
1358 {
1359     BufferedFile bf1, *bf = &bf1;
1360
1361     pstrcpy(bf->buffer, IO_BUF_SIZE, sym);
1362     pstrcat(bf->buffer, IO_BUF_SIZE, " ");
1363     /* default value */
1364     if (!value)
1365         value = "1";
1366     pstrcat(bf->buffer, IO_BUF_SIZE, value);
1367
1368     /* init file structure */
1369     bf->fd = -1;
1370     bf->buf_ptr = bf->buffer;
1371     bf->buf_end = bf->buffer + strlen(bf->buffer);
1372     *bf->buf_end = CH_EOB;
1373     bf->filename[0] = '\0';
1374     bf->line_num = 1;
1375     file = bf;
1376
1377     s1->include_stack_ptr = s1->include_stack;
1378
1379     /* parse with define parser */
1380     ch = file->buf_ptr[0];
1381     next_nomacro();
1382     parse_define();
1383     file = NULL;
1384 }
1385
1386 /* undefine a preprocessor symbol */
1387 void tcc_undefine_symbol(TCCState *s1, const char *sym)
1388 {
1389     TokenSym *ts;
1390     Sym *s;
1391     ts = tok_alloc(sym, strlen(sym));
1392     s = define_find(ts->tok);
1393     /* undefine symbol by putting an invalid name */
1394     if (s)
1395         define_undef(s);
1396 }
1397
1398
1399 #ifdef CONFIG_TCC_BACKTRACE
1400 /* print the position in the source file of PC value 'pc' by reading
1401    the stabs debug information */
1402 static unsigned long rt_printline(unsigned long wanted_pc)
1403 {
1404     Stab_Sym *sym, *sym_end;
1405     char func_name[128], last_func_name[128];
1406     unsigned long func_addr, last_pc, pc;
1407     const char *incl_files[INCLUDE_STACK_SIZE];
1408     int incl_index, len, last_line_num, i;
1409     const char *str, *p;
1410
1411     fprintf(stderr, "0x%08lx:", wanted_pc);
1412
1413     func_name[0] = '\0';
1414     func_addr = 0;
1415     incl_index = 0;
1416     last_func_name[0] = '\0';
1417     last_pc = 0xffffffff;
1418     last_line_num = 1;
1419     sym = (Stab_Sym *)stab_section->data + 1;
1420     sym_end = (Stab_Sym *)(stab_section->data + stab_section->data_offset);
1421     while (sym < sym_end) {
1422         switch(sym->n_type) {
1423             /* function start or end */
1424         case N_FUN:
1425             if (sym->n_strx == 0) {
1426                 /* we test if between last line and end of function */
1427                 pc = sym->n_value + func_addr;
1428                 if (wanted_pc >= last_pc && wanted_pc < pc)
1429                     goto found;
1430                 func_name[0] = '\0';
1431                 func_addr = 0;
1432             } else {
1433                 str = stabstr_section->data + sym->n_strx;
1434                 p = strchr(str, ':');
1435                 if (!p) {
1436                     pstrcpy(func_name, sizeof(func_name), str);
1437                 } else {
1438                     len = p - str;
1439                     if (len > sizeof(func_name) - 1)
1440                         len = sizeof(func_name) - 1;
1441                     memcpy(func_name, str, len);
1442                     func_name[len] = '\0';
1443                 }
1444                 func_addr = sym->n_value;
1445             }
1446             break;
1447             /* line number info */
1448         case N_SLINE:
1449             pc = sym->n_value + func_addr;
1450             if (wanted_pc >= last_pc && wanted_pc < pc)
1451                 goto found;
1452             last_pc = pc;
1453             last_line_num = sym->n_desc;
1454             /* XXX: slow! */
1455             strcpy(last_func_name, func_name);
1456             break;
1457             /* include files */
1458         case N_BINCL:
1459             str = stabstr_section->data + sym->n_strx;
1460         add_incl:
1461             if (incl_index < INCLUDE_STACK_SIZE) {
1462                 incl_files[incl_index++] = str;
1463             }
1464             break;
1465         case N_EINCL:
1466             if (incl_index > 1)
1467                 incl_index--;
1468             break;
1469         case N_SO:
1470             if (sym->n_strx == 0) {
1471                 incl_index = 0; /* end of translation unit */
1472             } else {
1473                 str = stabstr_section->data + sym->n_strx;
1474                 /* do not add path */
1475                 len = strlen(str);
1476                 if (len > 0 && str[len - 1] != '/')
1477                     goto add_incl;
1478             }
1479             break;
1480         }
1481         sym++;
1482     }
1483
1484     /* second pass: we try symtab symbols (no line number info) */
1485     incl_index = 0;
1486     {
1487         ElfW(Sym) *sym, *sym_end;
1488         int type;
1489
1490         sym_end = (ElfW(Sym) *)(symtab_section->data + symtab_section->data_offset);
1491         for(sym = (ElfW(Sym) *)symtab_section->data + 1;
1492             sym < sym_end;
1493             sym++) {
1494             type = ELFW(ST_TYPE)(sym->st_info);
1495             if (type == STT_FUNC) {
1496                 if (wanted_pc >= sym->st_value &&
1497                     wanted_pc < sym->st_value + sym->st_size) {
1498                     pstrcpy(last_func_name, sizeof(last_func_name),
1499                             strtab_section->data + sym->st_name);
1500                     func_addr = sym->st_value;
1501                     goto found;
1502                 }
1503             }
1504         }
1505     }
1506     /* did not find any info: */
1507     fprintf(stderr, " ???\n");
1508     return 0;
1509  found:
1510     if (last_func_name[0] != '\0') {
1511         fprintf(stderr, " %s()", last_func_name);
1512     }
1513     if (incl_index > 0) {
1514         fprintf(stderr, " (%s:%d",
1515                 incl_files[incl_index - 1], last_line_num);
1516         for(i = incl_index - 2; i >= 0; i--)
1517             fprintf(stderr, ", included from %s", incl_files[i]);
1518         fprintf(stderr, ")");
1519     }
1520     fprintf(stderr, "\n");
1521     return func_addr;
1522 }
1523
1524 #ifdef __i386__
1525 /* fix for glibc 2.1 */
1526 #ifndef REG_EIP
1527 #define REG_EIP EIP
1528 #define REG_EBP EBP
1529 #endif
1530
1531 /* return the PC at frame level 'level'. Return non zero if not found */
1532 static int rt_get_caller_pc(unsigned long *paddr,
1533                             ucontext_t *uc, int level)
1534 {
1535     unsigned long fp;
1536     int i;
1537
1538     if (level == 0) {
1539 #if defined(__FreeBSD__)
1540         *paddr = uc->uc_mcontext.mc_eip;
1541 #elif defined(__dietlibc__)
1542         *paddr = uc->uc_mcontext.eip;
1543 #else
1544         *paddr = uc->uc_mcontext.gregs[REG_EIP];
1545 #endif
1546         return 0;
1547     } else {
1548 #if defined(__FreeBSD__)
1549         fp = uc->uc_mcontext.mc_ebp;
1550 #elif defined(__dietlibc__)
1551         fp = uc->uc_mcontext.ebp;
1552 #else
1553         fp = uc->uc_mcontext.gregs[REG_EBP];
1554 #endif
1555         for(i=1;i<level;i++) {
1556             /* XXX: check address validity with program info */
1557             if (fp <= 0x1000 || fp >= 0xc0000000)
1558                 return -1;
1559             fp = ((unsigned long *)fp)[0];
1560         }
1561         *paddr = ((unsigned long *)fp)[1];
1562         return 0;
1563     }
1564 }
1565 #elif defined(__x86_64__)
1566 /* return the PC at frame level 'level'. Return non zero if not found */
1567 static int rt_get_caller_pc(unsigned long *paddr,
1568                             ucontext_t *uc, int level)
1569 {
1570     unsigned long fp;
1571     int i;
1572
1573     if (level == 0) {
1574         /* XXX: only support linux */
1575         *paddr = uc->uc_mcontext.gregs[REG_RIP];
1576         return 0;
1577     } else {
1578         fp = uc->uc_mcontext.gregs[REG_RBP];
1579         for(i=1;i<level;i++) {
1580             /* XXX: check address validity with program info */
1581             if (fp <= 0x1000)
1582                 return -1;
1583             fp = ((unsigned long *)fp)[0];
1584         }
1585         *paddr = ((unsigned long *)fp)[1];
1586         return 0;
1587     }
1588 }
1589 #else
1590 #warning add arch specific rt_get_caller_pc()
1591 static int rt_get_caller_pc(unsigned long *paddr,
1592                             ucontext_t *uc, int level)
1593 {
1594     return -1;
1595 }
1596 #endif
1597
1598 /* emit a run time error at position 'pc' */
1599 void rt_error(ucontext_t *uc, const char *fmt, ...)
1600 {
1601     va_list ap;
1602     unsigned long pc;
1603     int i;
1604
1605     va_start(ap, fmt);
1606     fprintf(stderr, "Runtime error: ");
1607     vfprintf(stderr, fmt, ap);
1608     fprintf(stderr, "\n");
1609     for(i=0;i<num_callers;i++) {
1610         if (rt_get_caller_pc(&pc, uc, i) < 0)
1611             break;
1612         if (i == 0)
1613             fprintf(stderr, "at ");
1614         else
1615             fprintf(stderr, "by ");
1616         pc = rt_printline(pc);
1617         if (pc == rt_prog_main && pc)
1618             break;
1619     }
1620     exit(255);
1621     va_end(ap);
1622 }
1623
1624 /* signal handler for fatal errors */
1625 static void sig_error(int signum, siginfo_t *siginf, void *puc)
1626 {
1627     ucontext_t *uc = puc;
1628
1629     switch(signum) {
1630     case SIGFPE:
1631         switch(siginf->si_code) {
1632         case FPE_INTDIV:
1633         case FPE_FLTDIV:
1634             rt_error(uc, "division by zero");
1635             break;
1636         default:
1637             rt_error(uc, "floating point exception");
1638             break;
1639         }
1640         break;
1641     case SIGBUS:
1642     case SIGSEGV:
1643         if (rt_bound_error_msg && *rt_bound_error_msg)
1644             rt_error(uc, *rt_bound_error_msg);
1645         else
1646             rt_error(uc, "dereferencing invalid pointer");
1647         break;
1648     case SIGILL:
1649         rt_error(uc, "illegal instruction");
1650         break;
1651     case SIGABRT:
1652         rt_error(uc, "abort() called");
1653         break;
1654     default:
1655         rt_error(uc, "caught signal %d", signum);
1656         break;
1657     }
1658     exit(255);
1659 }
1660
1661 #endif
1662
1663 /* copy code into memory passed in by the caller and do all relocations
1664    (needed before using tcc_get_symbol()).
1665    returns -1 on error and required size if ptr is NULL */
1666 int tcc_relocate(TCCState *s1, void *ptr)
1667 {
1668     Section *s;
1669     unsigned long offset, length;
1670     uplong mem;
1671     int i;
1672
1673     if (0 == s1->runtime_added) {
1674         s1->runtime_added = 1;
1675         s1->nb_errors = 0;
1676 #ifdef TCC_TARGET_PE
1677         pe_output_file(s1, NULL);
1678 #else
1679         tcc_add_runtime(s1);
1680         relocate_common_syms();
1681         tcc_add_linker_symbols(s1);
1682         build_got_entries(s1);
1683 #endif
1684         if (s1->nb_errors)
1685             return -1;
1686     }
1687
1688     offset = 0, mem = (uplong)ptr;
1689     for(i = 1; i < s1->nb_sections; i++) {
1690         s = s1->sections[i];
1691         if (0 == (s->sh_flags & SHF_ALLOC))
1692             continue;
1693         length = s->data_offset;
1694         s->sh_addr = mem ? (mem + offset + 15) & ~15 : 0;
1695         offset = (offset + length + 15) & ~15;
1696     }
1697
1698     /* relocate symbols */
1699     relocate_syms(s1, 1);
1700     if (s1->nb_errors)
1701         return -1;
1702
1703 #ifndef TCC_TARGET_PE
1704 #ifdef TCC_TARGET_X86_64
1705     s1->runtime_plt_and_got_offset = 0;
1706     s1->runtime_plt_and_got = (char *)(mem + offset);
1707     /* double the size of the buffer for got and plt entries
1708        XXX: calculate exact size for them? */
1709     offset *= 2;
1710 #endif
1711 #endif
1712
1713     if (0 == mem)
1714         return offset + 15;
1715
1716     /* relocate each section */
1717     for(i = 1; i < s1->nb_sections; i++) {
1718         s = s1->sections[i];
1719         if (s->reloc)
1720             relocate_section(s1, s);
1721     }
1722
1723     for(i = 1; i < s1->nb_sections; i++) {
1724         s = s1->sections[i];
1725         if (0 == (s->sh_flags & SHF_ALLOC))
1726             continue;
1727         length = s->data_offset;
1728         // printf("%-12s %08x %04x\n", s->name, s->sh_addr, length);
1729         ptr = (void*)(uplong)s->sh_addr;
1730         if (NULL == s->data || s->sh_type == SHT_NOBITS)
1731             memset(ptr, 0, length);
1732         else
1733             memcpy(ptr, s->data, length);
1734         /* mark executable sections as executable in memory */
1735         if (s->sh_flags & SHF_EXECINSTR)
1736             set_pages_executable(ptr, length);
1737     }
1738 #ifndef TCC_TARGET_PE
1739 #ifdef TCC_TARGET_X86_64
1740     set_pages_executable(s1->runtime_plt_and_got,
1741                          s1->runtime_plt_and_got_offset);
1742 #endif
1743 #endif
1744     return 0;
1745 }
1746
1747 /* launch the compiled program with the given arguments */
1748 int tcc_run(TCCState *s1, int argc, char **argv)
1749 {
1750     int (*prog_main)(int, char **);
1751     void *ptr;
1752     int ret;
1753
1754     ret = tcc_relocate(s1, NULL);
1755     if (ret < 0)
1756         return -1;
1757     ptr = tcc_malloc(ret);
1758     tcc_relocate(s1, ptr);
1759
1760     prog_main = tcc_get_symbol_err(s1, "main");
1761
1762     if (s1->do_debug) {
1763 #ifdef CONFIG_TCC_BACKTRACE
1764         struct sigaction sigact;
1765         /* install TCC signal handlers to print debug info on fatal
1766            runtime errors */
1767         sigact.sa_flags = SA_SIGINFO | SA_RESETHAND;
1768         sigact.sa_sigaction = sig_error;
1769         sigemptyset(&sigact.sa_mask);
1770         sigaction(SIGFPE, &sigact, NULL);
1771         sigaction(SIGILL, &sigact, NULL);
1772         sigaction(SIGSEGV, &sigact, NULL);
1773         sigaction(SIGBUS, &sigact, NULL);
1774         sigaction(SIGABRT, &sigact, NULL);
1775 #else
1776         error("debug mode not available");
1777 #endif
1778     }
1779
1780 #ifdef CONFIG_TCC_BCHECK
1781     if (s1->do_bounds_check) {
1782         void (*bound_init)(void);
1783         void (*bound_exit)(void);
1784         /* set error function */
1785         rt_bound_error_msg = tcc_get_symbol_err(s1, "__bound_error_msg");
1786         rt_prog_main = (unsigned long)prog_main;
1787         /* XXX: use .init section so that it also work in binary ? */
1788         bound_init = tcc_get_symbol_err(s1, "__bound_init");
1789         bound_exit = tcc_get_symbol_err(s1, "__bound_exit");
1790         bound_init();
1791         ret = (*prog_main)(argc, argv);
1792         bound_exit();
1793     } else
1794 #endif
1795     ret = (*prog_main)(argc, argv);
1796     tcc_free(ptr);
1797     return ret;
1798 }
1799
1800 void tcc_memstats(void)
1801 {
1802 #ifdef MEM_DEBUG
1803     printf("memory in use: %d\n", mem_cur_size);
1804 #endif
1805 }
1806
1807 static void tcc_cleanup(void)
1808 {
1809     int i, n;
1810
1811     if (NULL == tcc_state)
1812         return;
1813     tcc_state = NULL;
1814
1815     /* free -D defines */
1816     free_defines(NULL);
1817
1818     /* free tokens */
1819     n = tok_ident - TOK_IDENT;
1820     for(i = 0; i < n; i++)
1821         tcc_free(table_ident[i]);
1822     tcc_free(table_ident);
1823
1824     /* free sym_pools */
1825     dynarray_reset(&sym_pools, &nb_sym_pools);
1826     /* string buffer */
1827     cstr_free(&tokcstr);
1828     /* reset symbol stack */
1829     sym_free_first = NULL;
1830     /* cleanup from error/setjmp */
1831     macro_ptr = NULL;
1832 }
1833
1834 TCCState *tcc_new(void)
1835 {
1836     TCCState *s;
1837     char buffer[100];
1838     int a,b,c;
1839
1840     tcc_cleanup();
1841
1842     s = tcc_mallocz(sizeof(TCCState));
1843     if (!s)
1844         return NULL;
1845     tcc_state = s;
1846 #ifdef _WIN32
1847     tcc_set_lib_path_w32(s);
1848 #else
1849     tcc_set_lib_path(s, CONFIG_TCCDIR);
1850 #endif
1851     s->output_type = TCC_OUTPUT_MEMORY;
1852     preprocess_new();
1853
1854     /* we add dummy defines for some special macros to speed up tests
1855        and to have working defined() */
1856     define_push(TOK___LINE__, MACRO_OBJ, NULL, NULL);
1857     define_push(TOK___FILE__, MACRO_OBJ, NULL, NULL);
1858     define_push(TOK___DATE__, MACRO_OBJ, NULL, NULL);
1859     define_push(TOK___TIME__, MACRO_OBJ, NULL, NULL);
1860
1861     /* standard defines */
1862     tcc_define_symbol(s, "__STDC__", NULL);
1863     tcc_define_symbol(s, "__STDC_VERSION__", "199901L");
1864 #if defined(TCC_TARGET_I386)
1865     tcc_define_symbol(s, "__i386__", NULL);
1866 #endif
1867 #if defined(TCC_TARGET_X86_64)
1868     tcc_define_symbol(s, "__x86_64__", NULL);
1869 #endif
1870 #if defined(TCC_TARGET_ARM)
1871     tcc_define_symbol(s, "__ARM_ARCH_4__", NULL);
1872     tcc_define_symbol(s, "__arm_elf__", NULL);
1873     tcc_define_symbol(s, "__arm_elf", NULL);
1874     tcc_define_symbol(s, "arm_elf", NULL);
1875     tcc_define_symbol(s, "__arm__", NULL);
1876     tcc_define_symbol(s, "__arm", NULL);
1877     tcc_define_symbol(s, "arm", NULL);
1878     tcc_define_symbol(s, "__APCS_32__", NULL);
1879 #endif
1880 #ifdef TCC_TARGET_PE
1881     tcc_define_symbol(s, "_WIN32", NULL);
1882 #ifdef TCC_TARGET_X86_64
1883     tcc_define_symbol(s, "_WIN64", NULL);
1884 #endif
1885 #else
1886     tcc_define_symbol(s, "__unix__", NULL);
1887     tcc_define_symbol(s, "__unix", NULL);
1888 #if defined(__linux)
1889     tcc_define_symbol(s, "__linux__", NULL);
1890     tcc_define_symbol(s, "__linux", NULL);
1891 #endif
1892 #endif
1893     /* tiny C specific defines */
1894     sscanf(TCC_VERSION, "%d.%d.%d", &a, &b, &c);
1895     sprintf(buffer, "%d", a*10000 + b*100 + c);
1896     tcc_define_symbol(s, "__TINYC__", buffer);
1897
1898     /* tiny C & gcc defines */
1899     tcc_define_symbol(s, "__SIZE_TYPE__", "unsigned long");
1900     tcc_define_symbol(s, "__PTRDIFF_TYPE__", "long");
1901 #ifdef TCC_TARGET_PE
1902     tcc_define_symbol(s, "__WCHAR_TYPE__", "unsigned short");
1903 #else
1904     tcc_define_symbol(s, "__WCHAR_TYPE__", "int");
1905 #endif
1906
1907 #ifndef TCC_TARGET_PE
1908     /* default library paths */
1909     tcc_add_library_path(s, CONFIG_SYSROOT "/usr/local/lib");
1910     tcc_add_library_path(s, CONFIG_SYSROOT "/usr/lib");
1911     tcc_add_library_path(s, CONFIG_SYSROOT "/lib");
1912 #endif
1913
1914     /* no section zero */
1915     dynarray_add((void ***)&s->sections, &s->nb_sections, NULL);
1916
1917     /* create standard sections */
1918     text_section = new_section(s, ".text", SHT_PROGBITS, SHF_ALLOC | SHF_EXECINSTR);
1919     data_section = new_section(s, ".data", SHT_PROGBITS, SHF_ALLOC | SHF_WRITE);
1920     bss_section = new_section(s, ".bss", SHT_NOBITS, SHF_ALLOC | SHF_WRITE);
1921
1922     /* symbols are always generated for linking stage */
1923     symtab_section = new_symtab(s, ".symtab", SHT_SYMTAB, 0,
1924                                 ".strtab",
1925                                 ".hashtab", SHF_PRIVATE);
1926     strtab_section = symtab_section->link;
1927
1928     /* private symbol table for dynamic symbols */
1929     s->dynsymtab_section = new_symtab(s, ".dynsymtab", SHT_SYMTAB, SHF_PRIVATE,
1930                                       ".dynstrtab",
1931                                       ".dynhashtab", SHF_PRIVATE);
1932     s->alacarte_link = 1;
1933
1934 #ifdef CHAR_IS_UNSIGNED
1935     s->char_is_unsigned = 1;
1936 #endif
1937 #if defined(TCC_TARGET_PE) && 0
1938     /* XXX: currently the PE linker is not ready to support that */
1939     s->leading_underscore = 1;
1940 #endif
1941 #ifdef TCC_TARGET_I386
1942     s->seg_size = 32;
1943 #endif
1944     return s;
1945 }
1946
1947 void tcc_delete(TCCState *s1)
1948 {
1949     int i;
1950
1951     tcc_cleanup();
1952
1953     /* free all sections */
1954     for(i = 1; i < s1->nb_sections; i++)
1955         free_section(s1->sections[i]);
1956     dynarray_reset(&s1->sections, &s1->nb_sections);
1957
1958     for(i = 0; i < s1->nb_priv_sections; i++)
1959         free_section(s1->priv_sections[i]);
1960     dynarray_reset(&s1->priv_sections, &s1->nb_priv_sections);
1961
1962     /* free any loaded DLLs */
1963     for ( i = 0; i < s1->nb_loaded_dlls; i++) {
1964         DLLReference *ref = s1->loaded_dlls[i];
1965         if ( ref->handle )
1966             dlclose(ref->handle);
1967     }
1968
1969     /* free loaded dlls array */
1970     dynarray_reset(&s1->loaded_dlls, &s1->nb_loaded_dlls);
1971
1972     /* free library paths */
1973     dynarray_reset(&s1->library_paths, &s1->nb_library_paths);
1974
1975     /* free include paths */
1976     dynarray_reset(&s1->cached_includes, &s1->nb_cached_includes);
1977     dynarray_reset(&s1->include_paths, &s1->nb_include_paths);
1978     dynarray_reset(&s1->sysinclude_paths, &s1->nb_sysinclude_paths);
1979
1980     tcc_free(s1->tcc_lib_path);
1981     tcc_free(s1);
1982 }
1983
1984 int tcc_add_include_path(TCCState *s1, const char *pathname)
1985 {
1986     char *pathname1;
1987
1988     pathname1 = tcc_strdup(pathname);
1989     dynarray_add((void ***)&s1->include_paths, &s1->nb_include_paths, pathname1);
1990     return 0;
1991 }
1992
1993 int tcc_add_sysinclude_path(TCCState *s1, const char *pathname)
1994 {
1995     char *pathname1;
1996
1997     pathname1 = tcc_strdup(pathname);
1998     dynarray_add((void ***)&s1->sysinclude_paths, &s1->nb_sysinclude_paths, pathname1);
1999     return 0;
2000 }
2001
2002 static int tcc_add_file_internal(TCCState *s1, const char *filename, int flags)
2003 {
2004     const char *ext;
2005     ElfW(Ehdr) ehdr;
2006     int fd, ret, size;
2007     BufferedFile *saved_file;
2008
2009     ret = -1;
2010
2011     /* find source file type with extension */
2012     ext = tcc_fileextension(filename);
2013     if (ext[0])
2014         ext++;
2015
2016     /* open the file */
2017     saved_file = file;
2018     file = tcc_open(s1, filename);
2019     if (!file) {
2020         if (flags & AFF_PRINT_ERROR)
2021             error_noabort("file '%s' not found", filename);
2022         goto the_end;
2023     }
2024
2025     if (flags & AFF_PREPROCESS) {
2026         ret = tcc_preprocess(s1);
2027         goto the_end;
2028     }
2029
2030     if (!ext[0] || !PATHCMP(ext, "c")) {
2031         /* C file assumed */
2032         ret = tcc_compile(s1);
2033         goto the_end;
2034     }
2035
2036 #ifdef CONFIG_TCC_ASM
2037     if (!strcmp(ext, "S")) {
2038         /* preprocessed assembler */
2039         ret = tcc_assemble(s1, 1);
2040         goto the_end;
2041     }
2042
2043     if (!strcmp(ext, "s")) {
2044         /* non preprocessed assembler */
2045         ret = tcc_assemble(s1, 0);
2046         goto the_end;
2047     }
2048 #endif
2049
2050     fd = file->fd;
2051     /* assume executable format: auto guess file type */
2052     size = read(fd, &ehdr, sizeof(ehdr));
2053     lseek(fd, 0, SEEK_SET);
2054     if (size <= 0) {
2055         error_noabort("could not read header");
2056         goto the_end;
2057     }
2058
2059     if (size == sizeof(ehdr) &&
2060         ehdr.e_ident[0] == ELFMAG0 &&
2061         ehdr.e_ident[1] == ELFMAG1 &&
2062         ehdr.e_ident[2] == ELFMAG2 &&
2063         ehdr.e_ident[3] == ELFMAG3) {
2064
2065         /* do not display line number if error */
2066         file->line_num = 0;
2067         if (ehdr.e_type == ET_REL) {
2068             ret = tcc_load_object_file(s1, fd, 0);
2069             goto the_end;
2070
2071         }
2072 #ifndef TCC_TARGET_PE
2073         if (ehdr.e_type == ET_DYN) {
2074             if (s1->output_type == TCC_OUTPUT_MEMORY) {
2075                 void *h;
2076                 h = dlopen(filename, RTLD_GLOBAL | RTLD_LAZY);
2077                 if (h)
2078                     ret = 0;
2079             } else {
2080                 ret = tcc_load_dll(s1, fd, filename,
2081                                    (flags & AFF_REFERENCED_DLL) != 0);
2082             }
2083             goto the_end;
2084         }
2085 #endif
2086         error_noabort("unrecognized ELF file");
2087         goto the_end;
2088     }
2089
2090     if (memcmp((char *)&ehdr, ARMAG, 8) == 0) {
2091         file->line_num = 0; /* do not display line number if error */
2092         ret = tcc_load_archive(s1, fd);
2093         goto the_end;
2094     }
2095
2096 #ifdef TCC_TARGET_COFF
2097     if (*(uint16_t *)(&ehdr) == COFF_C67_MAGIC) {
2098         ret = tcc_load_coff(s1, fd);
2099         goto the_end;
2100     }
2101 #endif
2102
2103 #ifdef TCC_TARGET_PE
2104     ret = pe_load_file(s1, filename, fd);
2105 #else
2106     /* as GNU ld, consider it is an ld script if not recognized */
2107     ret = tcc_load_ldscript(s1);
2108 #endif
2109     if (ret < 0)
2110         error_noabort("unrecognized file type");
2111
2112 the_end:
2113     if (file)
2114         tcc_close(file);
2115     file = saved_file;
2116     return ret;
2117 }
2118
2119 int tcc_add_file(TCCState *s, const char *filename)
2120 {
2121     if (s->output_type == TCC_OUTPUT_PREPROCESS)
2122         return tcc_add_file_internal(s, filename, AFF_PRINT_ERROR | AFF_PREPROCESS);
2123     else
2124         return tcc_add_file_internal(s, filename, AFF_PRINT_ERROR);
2125 }
2126
2127 int tcc_add_library_path(TCCState *s, const char *pathname)
2128 {
2129     char *pathname1;
2130
2131     pathname1 = tcc_strdup(pathname);
2132     dynarray_add((void ***)&s->library_paths, &s->nb_library_paths, pathname1);
2133     return 0;
2134 }
2135
2136 /* find and load a dll. Return non zero if not found */
2137 /* XXX: add '-rpath' option support ? */
2138 static int tcc_add_dll(TCCState *s, const char *filename, int flags)
2139 {
2140     char buf[1024];
2141     int i;
2142
2143     for(i = 0; i < s->nb_library_paths; i++) {
2144         snprintf(buf, sizeof(buf), "%s/%s",
2145                  s->library_paths[i], filename);
2146         if (tcc_add_file_internal(s, buf, flags) == 0)
2147             return 0;
2148     }
2149     return -1;
2150 }
2151
2152 /* the library name is the same as the argument of the '-l' option */
2153 int tcc_add_library(TCCState *s, const char *libraryname)
2154 {
2155     char buf[1024];
2156     int i;
2157
2158     /* first we look for the dynamic library if not static linking */
2159     if (!s->static_link) {
2160 #ifdef TCC_TARGET_PE
2161         if (pe_add_dll(s, libraryname) == 0)
2162             return 0;
2163 #else
2164         snprintf(buf, sizeof(buf), "lib%s.so", libraryname);
2165         if (tcc_add_dll(s, buf, 0) == 0)
2166             return 0;
2167 #endif
2168     }
2169     /* then we look for the static library */
2170     for(i = 0; i < s->nb_library_paths; i++) {
2171         snprintf(buf, sizeof(buf), "%s/lib%s.a",
2172                  s->library_paths[i], libraryname);
2173         if (tcc_add_file_internal(s, buf, 0) == 0)
2174             return 0;
2175     }
2176     return -1;
2177 }
2178
2179 int tcc_add_symbol(TCCState *s, const char *name, void *val)
2180 {
2181     add_elf_sym(symtab_section, (uplong)val, 0,
2182                 ELFW(ST_INFO)(STB_GLOBAL, STT_NOTYPE), 0,
2183                 SHN_ABS, name);
2184     return 0;
2185 }
2186
2187 int tcc_set_output_type(TCCState *s, int output_type)
2188 {
2189     char buf[1024];
2190
2191     s->output_type = output_type;
2192
2193     if (!s->nostdinc) {
2194         /* default include paths */
2195         /* XXX: reverse order needed if -isystem support */
2196 #ifndef TCC_TARGET_PE
2197         tcc_add_sysinclude_path(s, CONFIG_SYSROOT "/usr/local/include");
2198         tcc_add_sysinclude_path(s, CONFIG_SYSROOT "/usr/include");
2199 #endif
2200         snprintf(buf, sizeof(buf), "%s/include", s->tcc_lib_path);
2201         tcc_add_sysinclude_path(s, buf);
2202 #ifdef TCC_TARGET_PE
2203         snprintf(buf, sizeof(buf), "%s/include/winapi", s->tcc_lib_path);
2204         tcc_add_sysinclude_path(s, buf);
2205 #endif
2206     }
2207
2208     /* if bound checking, then add corresponding sections */
2209 #ifdef CONFIG_TCC_BCHECK
2210     if (s->do_bounds_check) {
2211         /* define symbol */
2212         tcc_define_symbol(s, "__BOUNDS_CHECKING_ON", NULL);
2213         /* create bounds sections */
2214         bounds_section = new_section(s, ".bounds",
2215                                      SHT_PROGBITS, SHF_ALLOC);
2216         lbounds_section = new_section(s, ".lbounds",
2217                                       SHT_PROGBITS, SHF_ALLOC);
2218     }
2219 #endif
2220
2221     if (s->char_is_unsigned) {
2222         tcc_define_symbol(s, "__CHAR_UNSIGNED__", NULL);
2223     }
2224
2225     /* add debug sections */
2226     if (s->do_debug) {
2227         /* stab symbols */
2228         stab_section = new_section(s, ".stab", SHT_PROGBITS, 0);
2229         stab_section->sh_entsize = sizeof(Stab_Sym);
2230         stabstr_section = new_section(s, ".stabstr", SHT_STRTAB, 0);
2231         put_elf_str(stabstr_section, "");
2232         stab_section->link = stabstr_section;
2233         /* put first entry */
2234         put_stabs("", 0, 0, 0, 0);
2235     }
2236
2237     /* add libc crt1/crti objects */
2238 #ifndef TCC_TARGET_PE
2239     if ((output_type == TCC_OUTPUT_EXE || output_type == TCC_OUTPUT_DLL) &&
2240         !s->nostdlib) {
2241         if (output_type != TCC_OUTPUT_DLL)
2242             tcc_add_file(s, CONFIG_TCC_CRT_PREFIX "/crt1.o");
2243         tcc_add_file(s, CONFIG_TCC_CRT_PREFIX "/crti.o");
2244     }
2245 #endif
2246
2247 #ifdef TCC_TARGET_PE
2248     snprintf(buf, sizeof(buf), "%s/lib", s->tcc_lib_path);
2249     tcc_add_library_path(s, buf);
2250 #ifdef _WIN32
2251     if (GetSystemDirectory(buf, sizeof buf))
2252         tcc_add_library_path(s, buf);
2253 #endif
2254 #endif
2255
2256     return 0;
2257 }
2258
2259 #define WD_ALL    0x0001 /* warning is activated when using -Wall */
2260 #define FD_INVERT 0x0002 /* invert value before storing */
2261
2262 typedef struct FlagDef {
2263     uint16_t offset;
2264     uint16_t flags;
2265     const char *name;
2266 } FlagDef;
2267
2268 static const FlagDef warning_defs[] = {
2269     { offsetof(TCCState, warn_unsupported), 0, "unsupported" },
2270     { offsetof(TCCState, warn_write_strings), 0, "write-strings" },
2271     { offsetof(TCCState, warn_error), 0, "error" },
2272     { offsetof(TCCState, warn_implicit_function_declaration), WD_ALL,
2273       "implicit-function-declaration" },
2274 };
2275
2276 static int set_flag(TCCState *s, const FlagDef *flags, int nb_flags,
2277                     const char *name, int value)
2278 {
2279     int i;
2280     const FlagDef *p;
2281     const char *r;
2282
2283     r = name;
2284     if (r[0] == 'n' && r[1] == 'o' && r[2] == '-') {
2285         r += 3;
2286         value = !value;
2287     }
2288     for(i = 0, p = flags; i < nb_flags; i++, p++) {
2289         if (!strcmp(r, p->name))
2290             goto found;
2291     }
2292     return -1;
2293  found:
2294     if (p->flags & FD_INVERT)
2295         value = !value;
2296     *(int *)((uint8_t *)s + p->offset) = value;
2297     return 0;
2298 }
2299
2300
2301 /* set/reset a warning */
2302 int tcc_set_warning(TCCState *s, const char *warning_name, int value)
2303 {
2304     int i;
2305     const FlagDef *p;
2306
2307     if (!strcmp(warning_name, "all")) {
2308         for(i = 0, p = warning_defs; i < countof(warning_defs); i++, p++) {
2309             if (p->flags & WD_ALL)
2310                 *(int *)((uint8_t *)s + p->offset) = 1;
2311         }
2312         return 0;
2313     } else {
2314         return set_flag(s, warning_defs, countof(warning_defs),
2315                         warning_name, value);
2316     }
2317 }
2318
2319 static const FlagDef flag_defs[] = {
2320     { offsetof(TCCState, char_is_unsigned), 0, "unsigned-char" },
2321     { offsetof(TCCState, char_is_unsigned), FD_INVERT, "signed-char" },
2322     { offsetof(TCCState, nocommon), FD_INVERT, "common" },
2323     { offsetof(TCCState, leading_underscore), 0, "leading-underscore" },
2324 };
2325
2326 /* set/reset a flag */
2327 int tcc_set_flag(TCCState *s, const char *flag_name, int value)
2328 {
2329     return set_flag(s, flag_defs, countof(flag_defs),
2330                     flag_name, value);
2331 }
2332
2333 /* set CONFIG_TCCDIR at runtime */
2334 void tcc_set_lib_path(TCCState *s, const char *path)
2335 {
2336     tcc_free(s->tcc_lib_path);
2337     s->tcc_lib_path = tcc_strdup(path);
2338 }
2339
2340 void tcc_print_stats(TCCState *s, int64_t total_time)
2341 {
2342     double tt;
2343     tt = (double)total_time / 1000000.0;
2344     if (tt < 0.001)
2345         tt = 0.001;
2346     if (total_bytes < 1)
2347         total_bytes = 1;
2348     printf("%d idents, %d lines, %d bytes, %0.3f s, %d lines/s, %0.1f MB/s\n",
2349            tok_ident - TOK_IDENT, total_lines, total_bytes,
2350            tt, (int)(total_lines / tt),
2351            total_bytes / tt / 1000000.0);
2352 }