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 #ifdef _WIN32
 513 char *normalize_slashes(char *path)
 514 {
 515     char *p;
 516     for (p = path; *p; ++p)
 517         if (*p == '\\')
 518             *p = '/';
 519     return path;
 520 }
 521
 522 void tcc_set_lib_path_w32(TCCState *s)
 523 {
 524     /* on win32, we suppose the lib and includes are at the location
 525        of 'tcc.exe' */
 526     char path[1024], *p;
 527     GetModuleFileNameA(NULL, path, sizeof path);
 528     p = tcc_basename(normalize_slashes(strlwr(path)));
 529     if (p - 5 > path && 0 == strncmp(p - 5, "/bin/", 5))
 530         p -= 5;
 531     else if (p > path)
 532         p--;
 533     *p = 0;
 534     tcc_set_lib_path(s, path);
 535 }
 536 #endif
 537
 538 void set_pages_executable(void *ptr, unsigned long length)
 539 {
 540 #ifdef _WIN32
 541     unsigned long old_protect;
 542     VirtualProtect(ptr, length, PAGE_EXECUTE_READWRITE, &old_protect);
 543 #else
 544     unsigned long start, end;
 545     start = (unsigned long)ptr & ~(PAGESIZE - 1);
 546     end = (unsigned long)ptr + length;
 547     end = (end + PAGESIZE - 1) & ~(PAGESIZE - 1);
 548     mprotect((void *)start, end - start, PROT_READ | PROT_WRITE | PROT_EXEC);
 549 #endif
 550 }
 551
 552 /* memory management */
 553 #ifdef MEM_DEBUG
 554 int mem_cur_size;
 555 int mem_max_size;
 556 unsigned malloc_usable_size(void*);
 557 #endif
 558
 559 void tcc_free(void *ptr)
 560 {
 561 #ifdef MEM_DEBUG
 562     mem_cur_size -= malloc_usable_size(ptr);
 563 #endif
 564     free(ptr);
 565 }
 566
 567 void *tcc_malloc(unsigned long size)
 568 {
 569     void *ptr;
 570     ptr = malloc(size);
 571     if (!ptr && size)
 572         error("memory full");
 573 #ifdef MEM_DEBUG
 574     mem_cur_size += malloc_usable_size(ptr);
 575     if (mem_cur_size > mem_max_size)
 576         mem_max_size = mem_cur_size;
 577 #endif
 578     return ptr;
 579 }
 580
 581 void *tcc_mallocz(unsigned long size)
 582 {
 583     void *ptr;
 584     ptr = tcc_malloc(size);
 585     memset(ptr, 0, size);
 586     return ptr;
 587 }
 588
 589 void *tcc_realloc(void *ptr, unsigned long size)
 590 {
 591     void *ptr1;
 592 #ifdef MEM_DEBUG
 593     mem_cur_size -= malloc_usable_size(ptr);
 594 #endif
 595     ptr1 = realloc(ptr, size);
 596 #ifdef MEM_DEBUG
 597     /* NOTE: count not correct if alloc error, but not critical */
 598     mem_cur_size += malloc_usable_size(ptr1);
 599     if (mem_cur_size > mem_max_size)
 600         mem_max_size = mem_cur_size;
 601 #endif
 602     return ptr1;
 603 }
 604
 605 char *tcc_strdup(const char *str)
 606 {
 607     char *ptr;
 608     ptr = tcc_malloc(strlen(str) + 1);
 609     strcpy(ptr, str);
 610     return ptr;
 611 }
 612
 613 #define free(p) use_tcc_free(p)
 614 #define malloc(s) use_tcc_malloc(s)
 615 #define realloc(p, s) use_tcc_realloc(p, s)
 616
 617 void dynarray_add(void ***ptab, int *nb_ptr, void *data)
 618 {
 619     int nb, nb_alloc;
 620     void **pp;
 621
 622     nb = *nb_ptr;
 623     pp = *ptab;
 624     /* every power of two we double array size */
 625     if ((nb & (nb - 1)) == 0) {
 626         if (!nb)
 627             nb_alloc = 1;
 628         else
 629             nb_alloc = nb * 2;
 630         pp = tcc_realloc(pp, nb_alloc * sizeof(void *));
 631         if (!pp)
 632             error("memory full");
 633         *ptab = pp;
 634     }
 635     pp[nb++] = data;
 636     *nb_ptr = nb;
 637 }
 638
 639 void dynarray_reset(void *pp, int *n)
 640 {
 641     void **p;
 642     for (p = *(void***)pp; *n; ++p, --*n)
 643         if (*p)
 644             tcc_free(*p);
 645     tcc_free(*(void**)pp);
 646     *(void**)pp = NULL;
 647 }
 648
 649 /* symbol allocator */
 650 static Sym *__sym_malloc(void)
 651 {
 652     Sym *sym_pool, *sym, *last_sym;
 653     int i;
 654
 655     sym_pool = tcc_malloc(SYM_POOL_NB * sizeof(Sym));
 656     dynarray_add(&sym_pools, &nb_sym_pools, sym_pool);
 657
 658     last_sym = sym_free_first;
 659     sym = sym_pool;
 660     for(i = 0; i < SYM_POOL_NB; i++) {
 661         sym->next = last_sym;
 662         last_sym = sym;
 663         sym++;
 664     }
 665     sym_free_first = last_sym;
 666     return last_sym;
 667 }
 668
 669 static inline Sym *sym_malloc(void)
 670 {
 671     Sym *sym;
 672     sym = sym_free_first;
 673     if (!sym)
 674         sym = __sym_malloc();
 675     sym_free_first = sym->next;
 676     return sym;
 677 }
 678
 679 static inline void sym_free(Sym *sym)
 680 {
 681     sym->next = sym_free_first;
 682     sym_free_first = sym;
 683 }
 684
 685 Section *new_section(TCCState *s1, const char *name, int sh_type, int sh_flags)
 686 {
 687     Section *sec;
 688
 689     sec = tcc_mallocz(sizeof(Section) + strlen(name));
 690     strcpy(sec->name, name);
 691     sec->sh_type = sh_type;
 692     sec->sh_flags = sh_flags;
 693     switch(sh_type) {
 694     case SHT_HASH:
 695     case SHT_REL:
 696     case SHT_RELA:
 697     case SHT_DYNSYM:
 698     case SHT_SYMTAB:
 699     case SHT_DYNAMIC:
 700         sec->sh_addralign = 4;
 701         break;
 702     case SHT_STRTAB:
 703         sec->sh_addralign = 1;
 704         break;
 705     default:
 706         sec->sh_addralign = 32; /* default conservative alignment */
 707         break;
 708     }
 709
 710     if (sh_flags & SHF_PRIVATE) {
 711         dynarray_add((void ***)&s1->priv_sections, &s1->nb_priv_sections, sec);
 712     } else {
 713         sec->sh_num = s1->nb_sections;
 714         dynarray_add((void ***)&s1->sections, &s1->nb_sections, sec);
 715     }
 716
 717     return sec;
 718 }
 719
 720 static void free_section(Section *s)
 721 {
 722     tcc_free(s->data);
 723 }
 724
 725 /* realloc section and set its content to zero */
 726 static void section_realloc(Section *sec, unsigned long new_size)
 727 {
 728     unsigned long size;
 729     unsigned char *data;
 730
 731     size = sec->data_allocated;
 732     if (size == 0)
 733         size = 1;
 734     while (size < new_size)
 735         size = size * 2;
 736     data = tcc_realloc(sec->data, size);
 737     if (!data)
 738         error("memory full");
 739     memset(data + sec->data_allocated, 0, size - sec->data_allocated);
 740     sec->data = data;
 741     sec->data_allocated = size;
 742 }
 743
 744 /* reserve at least 'size' bytes in section 'sec' from
 745    sec->data_offset. */
 746 static void *section_ptr_add(Section *sec, unsigned long size)
 747 {
 748     unsigned long offset, offset1;
 749
 750     offset = sec->data_offset;
 751     offset1 = offset + size;
 752     if (offset1 > sec->data_allocated)
 753         section_realloc(sec, offset1);
 754     sec->data_offset = offset1;
 755     return sec->data + offset;
 756 }
 757
 758 /* return a reference to a section, and create it if it does not
 759    exists */
 760 Section *find_section(TCCState *s1, const char *name)
 761 {
 762     Section *sec;
 763     int i;
 764     for(i = 1; i < s1->nb_sections; i++) {
 765         sec = s1->sections[i];
 766         if (!strcmp(name, sec->name))
 767             return sec;
 768     }
 769     /* sections are created as PROGBITS */
 770     return new_section(s1, name, SHT_PROGBITS, SHF_ALLOC);
 771 }
 772
 773 /* update sym->c so that it points to an external symbol in section
 774    'section' with value 'value' */
 775 static void put_extern_sym2(Sym *sym, Section *section,
 776                             unsigned long value, unsigned long size,
 777                             int can_add_underscore)
 778 {
 779     int sym_type, sym_bind, sh_num, info, other, attr;
 780     ElfW(Sym) *esym;
 781     const char *name;
 782     char buf1[256];
 783
 784     if (section == NULL)
 785         sh_num = SHN_UNDEF;
 786     else if (section == SECTION_ABS)
 787         sh_num = SHN_ABS;
 788     else
 789         sh_num = section->sh_num;
 790
 791     other = attr = 0;
 792
 793     if ((sym->type.t & VT_BTYPE) == VT_FUNC) {
 794         sym_type = STT_FUNC;
 795 #ifdef TCC_TARGET_PE
 796         if (sym->type.ref)
 797             attr = sym->type.ref->r;
 798         if (FUNC_EXPORT(attr))
 799             other |= 1;
 800         if (FUNC_CALL(attr) == FUNC_STDCALL)
 801             other |= 2;
 802 #endif
 803     } else {
 804         sym_type = STT_OBJECT;
 805     }
 806
 807     if (sym->type.t & VT_STATIC)
 808         sym_bind = STB_LOCAL;
 809     else
 810         sym_bind = STB_GLOBAL;
 811
 812     if (!sym->c) {
 813         name = get_tok_str(sym->v, NULL);
 814 #ifdef CONFIG_TCC_BCHECK
 815         if (tcc_state->do_bounds_check) {
 816             char buf[32];
 817
 818             /* XXX: avoid doing that for statics ? */
 819             /* if bound checking is activated, we change some function
 820                names by adding the "__bound" prefix */
 821             switch(sym->v) {
 822 #if 0
 823             /* XXX: we rely only on malloc hooks */
 824             case TOK_malloc:
 825             case TOK_free:
 826             case TOK_realloc:
 827             case TOK_memalign:
 828             case TOK_calloc:
 829 #endif
 830             case TOK_memcpy:
 831             case TOK_memmove:
 832             case TOK_memset:
 833             case TOK_strlen:
 834             case TOK_strcpy:
 835             case TOK_alloca:
 836                 strcpy(buf, "__bound_");
 837                 strcat(buf, name);
 838                 name = buf;
 839                 break;
 840             }
 841         }
 842 #endif
 843
 844 #ifdef TCC_TARGET_PE
 845         if ((other & 2) && can_add_underscore) {
 846             sprintf(buf1, "_%s@%d", name, FUNC_ARGS(attr));
 847             name = buf1;
 848         } else
 849 #endif
 850         if (tcc_state->leading_underscore && can_add_underscore) {
 851             buf1[0] = '_';
 852             pstrcpy(buf1 + 1, sizeof(buf1) - 1, name);
 853             name = buf1;
 854         }
 855         info = ELFW(ST_INFO)(sym_bind, sym_type);
 856         sym->c = add_elf_sym(symtab_section, value, size, info, other, sh_num, name);
 857     } else {
 858         esym = &((ElfW(Sym) *)symtab_section->data)[sym->c];
 859         esym->st_value = value;
 860         esym->st_size = size;
 861         esym->st_shndx = sh_num;
 862         esym->st_other |= other;
 863     }
 864 }
 865
 866 static void put_extern_sym(Sym *sym, Section *section,
 867                            unsigned long value, unsigned long size)
 868 {
 869     put_extern_sym2(sym, section, value, size, 1);
 870 }
 871
 872 /* add a new relocation entry to symbol 'sym' in section 's' */
 873 static void greloc(Section *s, Sym *sym, unsigned long offset, int type)
 874 {
 875     if (!sym->c)
 876         put_extern_sym(sym, NULL, 0, 0);
 877     /* now we can add ELF relocation info */
 878     put_elf_reloc(symtab_section, s, offset, type, sym->c);
 879 }
 880
 881 static void strcat_vprintf(char *buf, int buf_size, const char *fmt, va_list ap)
 882 {
 883     int len;
 884     len = strlen(buf);
 885     vsnprintf(buf + len, buf_size - len, fmt, ap);
 886 }
 887
 888 static void strcat_printf(char *buf, int buf_size, const char *fmt, ...)
 889 {
 890     va_list ap;
 891     va_start(ap, fmt);
 892     strcat_vprintf(buf, buf_size, fmt, ap);
 893     va_end(ap);
 894 }
 895
 896 void error1(TCCState *s1, int is_warning, const char *fmt, va_list ap)
 897 {
 898     char buf[2048];
 899     BufferedFile **f;
 900
 901     buf[0] = '\0';
 902     if (file) {
 903         for(f = s1->include_stack; f < s1->include_stack_ptr; f++)
 904             strcat_printf(buf, sizeof(buf), "In file included from %s:%d:\n",
 905                           (*f)->filename, (*f)->line_num);
 906         if (file->line_num > 0) {
 907             strcat_printf(buf, sizeof(buf),
 908                           "%s:%d: ", file->filename, file->line_num);
 909         } else {
 910             strcat_printf(buf, sizeof(buf),
 911                           "%s: ", file->filename);
 912         }
 913     } else {
 914         strcat_printf(buf, sizeof(buf),
 915                       "tcc: ");
 916     }
 917     if (is_warning)
 918         strcat_printf(buf, sizeof(buf), "warning: ");
 919     else
 920         strcat_printf(buf, sizeof(buf), "error: ");
 921     strcat_vprintf(buf, sizeof(buf), fmt, ap);
 922
 923     if (!s1->error_func) {
 924         /* default case: stderr */
 925         fprintf(stderr, "%s\n", buf);
 926     } else {
 927         s1->error_func(s1->error_opaque, buf);
 928     }
 929     if (!is_warning || s1->warn_error)
 930         s1->nb_errors++;
 931 }
 932
 933 void tcc_set_error_func(TCCState *s, void *error_opaque,
 934                         void (*error_func)(void *opaque, const char *msg))
 935 {
 936     s->error_opaque = error_opaque;
 937     s->error_func = error_func;
 938 }
 939
 940 /* error without aborting current compilation */
 941 void error_noabort(const char *fmt, ...)
 942 {
 943     TCCState *s1 = tcc_state;
 944     va_list ap;
 945
 946     va_start(ap, fmt);
 947     error1(s1, 0, fmt, ap);
 948     va_end(ap);
 949 }
 950
 951 void error(const char *fmt, ...)
 952 {
 953     TCCState *s1 = tcc_state;
 954     va_list ap;
 955
 956     va_start(ap, fmt);
 957     error1(s1, 0, fmt, ap);
 958     va_end(ap);
 959     /* better than nothing: in some cases, we accept to handle errors */
 960     if (s1->error_set_jmp_enabled) {
 961         longjmp(s1->error_jmp_buf, 1);
 962     } else {
 963         /* XXX: eliminate this someday */
 964         exit(1);
 965     }
 966 }
 967
 968 void expect(const char *msg)
 969 {
 970     error("%s expected", msg);
 971 }
 972
 973 void warning(const char *fmt, ...)
 974 {
 975     TCCState *s1 = tcc_state;
 976     va_list ap;
 977
 978     if (s1->warn_none)
 979         return;
 980
 981     va_start(ap, fmt);
 982     error1(s1, 1, fmt, ap);
 983     va_end(ap);
 984 }
 985
 986 void skip(int c)
 987 {
 988     if (tok != c)
 989         error("'%c' expected", c);
 990     next();
 991 }
 992
 993 static void test_lvalue(void)
 994 {
 995     if (!(vtop->r & VT_LVAL))
 996         expect("lvalue");
 997 }
 998
 999 /* CString handling */
1000
1001 static void cstr_realloc(CString *cstr, int new_size)
1002 {
1003     int size;
1004     void *data;
1005
1006     size = cstr->size_allocated;
1007     if (size == 0)
1008         size = 8; /* no need to allocate a too small first string */
1009     while (size < new_size)
1010         size = size * 2;
1011     data = tcc_realloc(cstr->data_allocated, size);
1012     if (!data)
1013         error("memory full");
1014     cstr->data_allocated = data;
1015     cstr->size_allocated = size;
1016     cstr->data = data;
1017 }
1018
1019 /* add a byte */
1020 static inline void cstr_ccat(CString *cstr, int ch)
1021 {
1022     int size;
1023     size = cstr->size + 1;
1024     if (size > cstr->size_allocated)
1025         cstr_realloc(cstr, size);
1026     ((unsigned char *)cstr->data)[size - 1] = ch;
1027     cstr->size = size;
1028 }
1029
1030 static void cstr_cat(CString *cstr, const char *str)
1031 {
1032     int c;
1033     for(;;) {
1034         c = *str;
1035         if (c == '\0')
1036             break;
1037         cstr_ccat(cstr, c);
1038         str++;
1039     }
1040 }
1041
1042 /* add a wide char */
1043 static void cstr_wccat(CString *cstr, int ch)
1044 {
1045     int size;
1046     size = cstr->size + sizeof(nwchar_t);
1047     if (size > cstr->size_allocated)
1048         cstr_realloc(cstr, size);
1049     *(nwchar_t *)(((unsigned char *)cstr->data) + size - sizeof(nwchar_t)) = ch;
1050     cstr->size = size;
1051 }
1052
1053 static void cstr_new(CString *cstr)
1054 {
1055     memset(cstr, 0, sizeof(CString));
1056 }
1057
1058 /* free string and reset it to NULL */
1059 static void cstr_free(CString *cstr)
1060 {
1061     tcc_free(cstr->data_allocated);
1062     cstr_new(cstr);
1063 }
1064
1065 #define cstr_reset(cstr) cstr_free(cstr)
1066
1067 /* XXX: unicode ? */
1068 static void add_char(CString *cstr, int c)
1069 {
1070     if (c == '\'' || c == '\"' || c == '\\') {
1071         /* XXX: could be more precise if char or string */
1072         cstr_ccat(cstr, '\\');
1073     }
1074     if (c >= 32 && c <= 126) {
1075         cstr_ccat(cstr, c);
1076     } else {
1077         cstr_ccat(cstr, '\\');
1078         if (c == '\n') {
1079             cstr_ccat(cstr, 'n');
1080         } else {
1081             cstr_ccat(cstr, '0' + ((c >> 6) & 7));
1082             cstr_ccat(cstr, '0' + ((c >> 3) & 7));
1083             cstr_ccat(cstr, '0' + (c & 7));
1084         }
1085     }
1086 }
1087
1088 /* push, without hashing */
1089 static Sym *sym_push2(Sym **ps, int v, int t, long c)
1090 {
1091     Sym *s;
1092     s = sym_malloc();
1093     s->v = v;
1094     s->type.t = t;
1095 #ifdef _WIN64
1096     s->d = NULL;
1097 #endif
1098     s->c = c;
1099     s->next = NULL;
1100     /* add in stack */
1101     s->prev = *ps;
1102     *ps = s;
1103     return s;
1104 }
1105
1106 /* find a symbol and return its associated structure. 's' is the top
1107    of the symbol stack */
1108 static Sym *sym_find2(Sym *s, int v)
1109 {
1110     while (s) {
1111         if (s->v == v)
1112             return s;
1113         s = s->prev;
1114     }
1115     return NULL;
1116 }
1117
1118 /* structure lookup */
1119 static inline Sym *struct_find(int v)
1120 {
1121     v -= TOK_IDENT;
1122     if ((unsigned)v >= (unsigned)(tok_ident - TOK_IDENT))
1123         return NULL;
1124     return table_ident[v]->sym_struct;
1125 }
1126
1127 /* find an identifier */
1128 static inline Sym *sym_find(int v)
1129 {
1130     v -= TOK_IDENT;
1131     if ((unsigned)v >= (unsigned)(tok_ident - TOK_IDENT))
1132         return NULL;
1133     return table_ident[v]->sym_identifier;
1134 }
1135
1136 /* push a given symbol on the symbol stack */
1137 static Sym *sym_push(int v, CType *type, int r, int c)
1138 {
1139     Sym *s, **ps;
1140     TokenSym *ts;
1141
1142     if (local_stack)
1143         ps = &local_stack;
1144     else
1145         ps = &global_stack;
1146     s = sym_push2(ps, v, type->t, c);
1147     s->type.ref = type->ref;
1148     s->r = r;
1149     /* don't record fields or anonymous symbols */
1150     /* XXX: simplify */
1151     if (!(v & SYM_FIELD) && (v & ~SYM_STRUCT) < SYM_FIRST_ANOM) {
1152         /* record symbol in token array */
1153         ts = table_ident[(v & ~SYM_STRUCT) - TOK_IDENT];
1154         if (v & SYM_STRUCT)
1155             ps = &ts->sym_struct;
1156         else
1157             ps = &ts->sym_identifier;
1158         s->prev_tok = *ps;
1159         *ps = s;
1160     }
1161     return s;
1162 }
1163
1164 /* push a global identifier */
1165 static Sym *global_identifier_push(int v, int t, int c)
1166 {
1167     Sym *s, **ps;
1168     s = sym_push2(&global_stack, v, t, c);
1169     /* don't record anonymous symbol */
1170     if (v < SYM_FIRST_ANOM) {
1171         ps = &table_ident[v - TOK_IDENT]->sym_identifier;
1172         /* modify the top most local identifier, so that
1173            sym_identifier will point to 's' when popped */
1174         while (*ps != NULL)
1175             ps = &(*ps)->prev_tok;
1176         s->prev_tok = NULL;
1177         *ps = s;
1178     }
1179     return s;
1180 }
1181
1182 /* pop symbols until top reaches 'b' */
1183 static void sym_pop(Sym **ptop, Sym *b)
1184 {
1185     Sym *s, *ss, **ps;
1186     TokenSym *ts;
1187     int v;
1188
1189     s = *ptop;
1190     while(s != b) {
1191         ss = s->prev;
1192         v = s->v;
1193         /* remove symbol in token array */
1194         /* XXX: simplify */
1195         if (!(v & SYM_FIELD) && (v & ~SYM_STRUCT) < SYM_FIRST_ANOM) {
1196             ts = table_ident[(v & ~SYM_STRUCT) - TOK_IDENT];
1197             if (v & SYM_STRUCT)
1198                 ps = &ts->sym_struct;
1199             else
1200                 ps = &ts->sym_identifier;
1201             *ps = s->prev_tok;
1202         }
1203         sym_free(s);
1204         s = ss;
1205     }
1206     *ptop = b;
1207 }
1208
1209 /* I/O layer */
1210
1211 BufferedFile *tcc_open(TCCState *s1, const char *filename)
1212 {
1213     int fd;
1214     BufferedFile *bf;
1215
1216     if (strcmp(filename, "-") == 0)
1217         fd = 0, filename = "stdin";
1218     else
1219         fd = open(filename, O_RDONLY | O_BINARY);
1220     if ((s1->verbose == 2 && fd >= 0) || s1->verbose == 3)
1221         printf("%s %*s%s\n", fd < 0 ? "nf":"->",
1222                (int)(s1->include_stack_ptr - s1->include_stack), "", filename);
1223     if (fd < 0)
1224         return NULL;
1225     bf = tcc_malloc(sizeof(BufferedFile));
1226     bf->fd = fd;
1227     bf->buf_ptr = bf->buffer;
1228     bf->buf_end = bf->buffer;
1229     bf->buffer[0] = CH_EOB; /* put eob symbol */
1230     pstrcpy(bf->filename, sizeof(bf->filename), filename);
1231 #ifdef _WIN32
1232     normalize_slashes(bf->filename);
1233 #endif
1234     bf->line_num = 1;
1235     bf->ifndef_macro = 0;
1236     bf->ifdef_stack_ptr = s1->ifdef_stack_ptr;
1237     //    printf("opening '%s'\n", filename);
1238     return bf;
1239 }
1240
1241 void tcc_close(BufferedFile *bf)
1242 {
1243     total_lines += bf->line_num;
1244     close(bf->fd);
1245     tcc_free(bf);
1246 }
1247
1248 /* compile the C file opened in 'file'. Return non zero if errors. */
1249 static int tcc_compile(TCCState *s1)
1250 {
1251     Sym *define_start;
1252     char buf[512];
1253     volatile int section_sym;
1254
1255 #ifdef INC_DEBUG
1256     printf("%s: **** new file\n", file->filename);
1257 #endif
1258     preprocess_init(s1);
1259
1260     cur_text_section = NULL;
1261     funcname = "";
1262     anon_sym = SYM_FIRST_ANOM;
1263
1264     /* file info: full path + filename */
1265     section_sym = 0; /* avoid warning */
1266     if (s1->do_debug) {
1267         section_sym = put_elf_sym(symtab_section, 0, 0,
1268                                   ELFW(ST_INFO)(STB_LOCAL, STT_SECTION), 0,
1269                                   text_section->sh_num, NULL);
1270         getcwd(buf, sizeof(buf));
1271 #ifdef _WIN32
1272         normalize_slashes(buf);
1273 #endif
1274         pstrcat(buf, sizeof(buf), "/");
1275         put_stabs_r(buf, N_SO, 0, 0,
1276                     text_section->data_offset, text_section, section_sym);
1277         put_stabs_r(file->filename, N_SO, 0, 0,
1278                     text_section->data_offset, text_section, section_sym);
1279     }
1280     /* an elf symbol of type STT_FILE must be put so that STB_LOCAL
1281        symbols can be safely used */
1282     put_elf_sym(symtab_section, 0, 0,
1283                 ELFW(ST_INFO)(STB_LOCAL, STT_FILE), 0,
1284                 SHN_ABS, file->filename);
1285
1286     /* define some often used types */
1287     int_type.t = VT_INT;
1288
1289     char_pointer_type.t = VT_BYTE;
1290     mk_pointer(&char_pointer_type);
1291
1292     func_old_type.t = VT_FUNC;
1293     func_old_type.ref = sym_push(SYM_FIELD, &int_type, FUNC_CDECL, FUNC_OLD);
1294
1295 #if defined(TCC_ARM_EABI) && defined(TCC_ARM_VFP)
1296     float_type.t = VT_FLOAT;
1297     double_type.t = VT_DOUBLE;
1298
1299     func_float_type.t = VT_FUNC;
1300     func_float_type.ref = sym_push(SYM_FIELD, &float_type, FUNC_CDECL, FUNC_OLD);
1301     func_double_type.t = VT_FUNC;
1302     func_double_type.ref = sym_push(SYM_FIELD, &double_type, FUNC_CDECL, FUNC_OLD);
1303 #endif
1304
1305 #if 0
1306     /* define 'void *alloca(unsigned int)' builtin function */
1307     {
1308         Sym *s1;
1309
1310         p = anon_sym++;
1311         sym = sym_push(p, mk_pointer(VT_VOID), FUNC_CDECL, FUNC_NEW);
1312         s1 = sym_push(SYM_FIELD, VT_UNSIGNED | VT_INT, 0, 0);
1313         s1->next = NULL;
1314         sym->next = s1;
1315         sym_push(TOK_alloca, VT_FUNC | (p << VT_STRUCT_SHIFT), VT_CONST, 0);
1316     }
1317 #endif
1318
1319     define_start = define_stack;
1320     nocode_wanted = 1;
1321
1322     if (setjmp(s1->error_jmp_buf) == 0) {
1323         s1->nb_errors = 0;
1324         s1->error_set_jmp_enabled = 1;
1325
1326         ch = file->buf_ptr[0];
1327         tok_flags = TOK_FLAG_BOL | TOK_FLAG_BOF;
1328         parse_flags = PARSE_FLAG_PREPROCESS | PARSE_FLAG_TOK_NUM;
1329         next();
1330         decl(VT_CONST);
1331         if (tok != TOK_EOF)
1332             expect("declaration");
1333
1334         /* end of translation unit info */
1335         if (s1->do_debug) {
1336             put_stabs_r(NULL, N_SO, 0, 0,
1337                         text_section->data_offset, text_section, section_sym);
1338         }
1339     }
1340     s1->error_set_jmp_enabled = 0;
1341
1342     /* reset define stack, but leave -Dsymbols (may be incorrect if
1343        they are undefined) */
1344     free_defines(define_start);
1345
1346     gen_inline_functions();
1347
1348     sym_pop(&global_stack, NULL);
1349     sym_pop(&local_stack, NULL);
1350
1351     return s1->nb_errors != 0 ? -1 : 0;
1352 }
1353
1354 int tcc_compile_string(TCCState *s, const char *str)
1355 {
1356     BufferedFile bf1, *bf = &bf1;
1357     int ret, len;
1358     char *buf;
1359
1360     /* init file structure */
1361     bf->fd = -1;
1362     /* XXX: avoid copying */
1363     len = strlen(str);
1364     buf = tcc_malloc(len + 1);
1365     if (!buf)
1366         return -1;
1367     memcpy(buf, str, len);
1368     buf[len] = CH_EOB;
1369     bf->buf_ptr = buf;
1370     bf->buf_end = buf + len;
1371     pstrcpy(bf->filename, sizeof(bf->filename), "<string>");
1372     bf->line_num = 1;
1373     file = bf;
1374     ret = tcc_compile(s);
1375     file = NULL;
1376     tcc_free(buf);
1377
1378     /* currently, no need to close */
1379     return ret;
1380 }
1381
1382 /* define a preprocessor symbol. A value can also be provided with the '=' operator */
1383 void tcc_define_symbol(TCCState *s1, const char *sym, const char *value)
1384 {
1385     BufferedFile bf1, *bf = &bf1;
1386
1387     pstrcpy(bf->buffer, IO_BUF_SIZE, sym);
1388     pstrcat(bf->buffer, IO_BUF_SIZE, " ");
1389     /* default value */
1390     if (!value)
1391         value = "1";
1392     pstrcat(bf->buffer, IO_BUF_SIZE, value);
1393
1394     /* init file structure */
1395     bf->fd = -1;
1396     bf->buf_ptr = bf->buffer;
1397     bf->buf_end = bf->buffer + strlen(bf->buffer);
1398     *bf->buf_end = CH_EOB;
1399     bf->filename[0] = '\0';
1400     bf->line_num = 1;
1401     file = bf;
1402
1403     s1->include_stack_ptr = s1->include_stack;
1404
1405     /* parse with define parser */
1406     ch = file->buf_ptr[0];
1407     next_nomacro();
1408     parse_define();
1409     file = NULL;
1410 }
1411
1412 /* undefine a preprocessor symbol */
1413 void tcc_undefine_symbol(TCCState *s1, const char *sym)
1414 {
1415     TokenSym *ts;
1416     Sym *s;
1417     ts = tok_alloc(sym, strlen(sym));
1418     s = define_find(ts->tok);
1419     /* undefine symbol by putting an invalid name */
1420     if (s)
1421         define_undef(s);
1422 }
1423
1424
1425 #ifdef CONFIG_TCC_BACKTRACE
1426 /* print the position in the source file of PC value 'pc' by reading
1427    the stabs debug information */
1428 static unsigned long rt_printline(unsigned long wanted_pc)
1429 {
1430     Stab_Sym *sym, *sym_end;
1431     char func_name[128], last_func_name[128];
1432     unsigned long func_addr, last_pc, pc;
1433     const char *incl_files[INCLUDE_STACK_SIZE];
1434     int incl_index, len, last_line_num, i;
1435     const char *str, *p;
1436
1437     fprintf(stderr, "0x%08lx:", wanted_pc);
1438
1439     func_name[0] = '\0';
1440     func_addr = 0;
1441     incl_index = 0;
1442     last_func_name[0] = '\0';
1443     last_pc = 0xffffffff;
1444     last_line_num = 1;
1445     sym = (Stab_Sym *)stab_section->data + 1;
1446     sym_end = (Stab_Sym *)(stab_section->data + stab_section->data_offset);
1447     while (sym < sym_end) {
1448         switch(sym->n_type) {
1449             /* function start or end */
1450         case N_FUN:
1451             if (sym->n_strx == 0) {
1452                 /* we test if between last line and end of function */
1453                 pc = sym->n_value + func_addr;
1454                 if (wanted_pc >= last_pc && wanted_pc < pc)
1455                     goto found;
1456                 func_name[0] = '\0';
1457                 func_addr = 0;
1458             } else {
1459                 str = stabstr_section->data + sym->n_strx;
1460                 p = strchr(str, ':');
1461                 if (!p) {
1462                     pstrcpy(func_name, sizeof(func_name), str);
1463                 } else {
1464                     len = p - str;
1465                     if (len > sizeof(func_name) - 1)
1466                         len = sizeof(func_name) - 1;
1467                     memcpy(func_name, str, len);
1468                     func_name[len] = '\0';
1469                 }
1470                 func_addr = sym->n_value;
1471             }
1472             break;
1473             /* line number info */
1474         case N_SLINE:
1475             pc = sym->n_value + func_addr;
1476             if (wanted_pc >= last_pc && wanted_pc < pc)
1477                 goto found;
1478             last_pc = pc;
1479             last_line_num = sym->n_desc;
1480             /* XXX: slow! */
1481             strcpy(last_func_name, func_name);
1482             break;
1483             /* include files */
1484         case N_BINCL:
1485             str = stabstr_section->data + sym->n_strx;
1486         add_incl:
1487             if (incl_index < INCLUDE_STACK_SIZE) {
1488                 incl_files[incl_index++] = str;
1489             }
1490             break;
1491         case N_EINCL:
1492             if (incl_index > 1)
1493                 incl_index--;
1494             break;
1495         case N_SO:
1496             if (sym->n_strx == 0) {
1497                 incl_index = 0; /* end of translation unit */
1498             } else {
1499                 str = stabstr_section->data + sym->n_strx;
1500                 /* do not add path */
1501                 len = strlen(str);
1502                 if (len > 0 && str[len - 1] != '/')
1503                     goto add_incl;
1504             }
1505             break;
1506         }
1507         sym++;
1508     }
1509
1510     /* second pass: we try symtab symbols (no line number info) */
1511     incl_index = 0;
1512     {
1513         ElfW(Sym) *sym, *sym_end;
1514         int type;
1515
1516         sym_end = (ElfW(Sym) *)(symtab_section->data + symtab_section->data_offset);
1517         for(sym = (ElfW(Sym) *)symtab_section->data + 1;
1518             sym < sym_end;
1519             sym++) {
1520             type = ELFW(ST_TYPE)(sym->st_info);
1521             if (type == STT_FUNC) {
1522                 if (wanted_pc >= sym->st_value &&
1523                     wanted_pc < sym->st_value + sym->st_size) {
1524                     pstrcpy(last_func_name, sizeof(last_func_name),
1525                             strtab_section->data + sym->st_name);
1526                     func_addr = sym->st_value;
1527                     goto found;
1528                 }
1529             }
1530         }
1531     }
1532     /* did not find any info: */
1533     fprintf(stderr, " ???\n");
1534     return 0;
1535  found:
1536     if (last_func_name[0] != '\0') {
1537         fprintf(stderr, " %s()", last_func_name);
1538     }
1539     if (incl_index > 0) {
1540         fprintf(stderr, " (%s:%d",
1541                 incl_files[incl_index - 1], last_line_num);
1542         for(i = incl_index - 2; i >= 0; i--)
1543             fprintf(stderr, ", included from %s", incl_files[i]);
1544         fprintf(stderr, ")");
1545     }
1546     fprintf(stderr, "\n");
1547     return func_addr;
1548 }
1549
1550 #ifdef __i386__
1551 /* fix for glibc 2.1 */
1552 #ifndef REG_EIP
1553 #define REG_EIP EIP
1554 #define REG_EBP EBP
1555 #endif
1556
1557 /* return the PC at frame level 'level'. Return non zero if not found */
1558 static int rt_get_caller_pc(unsigned long *paddr,
1559                             ucontext_t *uc, int level)
1560 {
1561     unsigned long fp;
1562     int i;
1563
1564     if (level == 0) {
1565 #if defined(__FreeBSD__)
1566         *paddr = uc->uc_mcontext.mc_eip;
1567 #elif defined(__dietlibc__)
1568         *paddr = uc->uc_mcontext.eip;
1569 #else
1570         *paddr = uc->uc_mcontext.gregs[REG_EIP];
1571 #endif
1572         return 0;
1573     } else {
1574 #if defined(__FreeBSD__)
1575         fp = uc->uc_mcontext.mc_ebp;
1576 #elif defined(__dietlibc__)
1577         fp = uc->uc_mcontext.ebp;
1578 #else
1579         fp = uc->uc_mcontext.gregs[REG_EBP];
1580 #endif
1581         for(i=1;i<level;i++) {
1582             /* XXX: check address validity with program info */
1583             if (fp <= 0x1000 || fp >= 0xc0000000)
1584                 return -1;
1585             fp = ((unsigned long *)fp)[0];
1586         }
1587         *paddr = ((unsigned long *)fp)[1];
1588         return 0;
1589     }
1590 }
1591 #elif defined(__x86_64__)
1592 /* return the PC at frame level 'level'. Return non zero if not found */
1593 static int rt_get_caller_pc(unsigned long *paddr,
1594                             ucontext_t *uc, int level)
1595 {
1596     unsigned long fp;
1597     int i;
1598
1599     if (level == 0) {
1600         /* XXX: only support linux */
1601         *paddr = uc->uc_mcontext.gregs[REG_RIP];
1602         return 0;
1603     } else {
1604         fp = uc->uc_mcontext.gregs[REG_RBP];
1605         for(i=1;i<level;i++) {
1606             /* XXX: check address validity with program info */
1607             if (fp <= 0x1000)
1608                 return -1;
1609             fp = ((unsigned long *)fp)[0];
1610         }
1611         *paddr = ((unsigned long *)fp)[1];
1612         return 0;
1613     }
1614 }
1615 #else
1616 #warning add arch specific rt_get_caller_pc()
1617 static int rt_get_caller_pc(unsigned long *paddr,
1618                             ucontext_t *uc, int level)
1619 {
1620     return -1;
1621 }
1622 #endif
1623
1624 /* emit a run time error at position 'pc' */
1625 void rt_error(ucontext_t *uc, const char *fmt, ...)
1626 {
1627     va_list ap;
1628     unsigned long pc;
1629     int i;
1630
1631     va_start(ap, fmt);
1632     fprintf(stderr, "Runtime error: ");
1633     vfprintf(stderr, fmt, ap);
1634     fprintf(stderr, "\n");
1635     for(i=0;i<num_callers;i++) {
1636         if (rt_get_caller_pc(&pc, uc, i) < 0)
1637             break;
1638         if (i == 0)
1639             fprintf(stderr, "at ");
1640         else
1641             fprintf(stderr, "by ");
1642         pc = rt_printline(pc);
1643         if (pc == rt_prog_main && pc)
1644             break;
1645     }
1646     exit(255);
1647     va_end(ap);
1648 }
1649
1650 /* signal handler for fatal errors */
1651 static void sig_error(int signum, siginfo_t *siginf, void *puc)
1652 {
1653     ucontext_t *uc = puc;
1654
1655     switch(signum) {
1656     case SIGFPE:
1657         switch(siginf->si_code) {
1658         case FPE_INTDIV:
1659         case FPE_FLTDIV:
1660             rt_error(uc, "division by zero");
1661             break;
1662         default:
1663             rt_error(uc, "floating point exception");
1664             break;
1665         }
1666         break;
1667     case SIGBUS:
1668     case SIGSEGV:
1669         if (rt_bound_error_msg && *rt_bound_error_msg)
1670             rt_error(uc, *rt_bound_error_msg);
1671         else
1672             rt_error(uc, "dereferencing invalid pointer");
1673         break;
1674     case SIGILL:
1675         rt_error(uc, "illegal instruction");
1676         break;
1677     case SIGABRT:
1678         rt_error(uc, "abort() called");
1679         break;
1680     default:
1681         rt_error(uc, "caught signal %d", signum);
1682         break;
1683     }
1684     exit(255);
1685 }
1686
1687 #endif
1688
1689 /* copy code into memory passed in by the caller and do all relocations
1690    (needed before using tcc_get_symbol()).
1691    returns -1 on error and required size if ptr is NULL */
1692 int tcc_relocate(TCCState *s1, void *ptr)
1693 {
1694     Section *s;
1695     unsigned long offset, length;
1696     uplong mem;
1697     int i;
1698
1699     if (0 == s1->runtime_added) {
1700         s1->runtime_added = 1;
1701         s1->nb_errors = 0;
1702 #ifdef TCC_TARGET_PE
1703         pe_output_file(s1, NULL);
1704 #else
1705         tcc_add_runtime(s1);
1706         relocate_common_syms();
1707         tcc_add_linker_symbols(s1);
1708         build_got_entries(s1);
1709 #endif
1710         if (s1->nb_errors)
1711             return -1;
1712     }
1713
1714     offset = 0, mem = (uplong)ptr;
1715     for(i = 1; i < s1->nb_sections; i++) {
1716         s = s1->sections[i];
1717         if (0 == (s->sh_flags & SHF_ALLOC))
1718             continue;
1719         length = s->data_offset;
1720         s->sh_addr = mem ? (mem + offset + 15) & ~15 : 0;
1721         offset = (offset + length + 15) & ~15;
1722     }
1723
1724     /* relocate symbols */
1725     relocate_syms(s1, 1);
1726     if (s1->nb_errors)
1727         return -1;
1728
1729 #ifndef TCC_TARGET_PE
1730 #ifdef TCC_TARGET_X86_64
1731     s1->runtime_plt_and_got_offset = 0;
1732     s1->runtime_plt_and_got = (char *)(mem + offset);
1733     /* double the size of the buffer for got and plt entries
1734        XXX: calculate exact size for them? */
1735     offset *= 2;
1736 #endif
1737 #endif
1738
1739     if (0 == mem)
1740         return offset + 15;
1741
1742     /* relocate each section */
1743     for(i = 1; i < s1->nb_sections; i++) {
1744         s = s1->sections[i];
1745         if (s->reloc)
1746             relocate_section(s1, s);
1747     }
1748
1749     for(i = 1; i < s1->nb_sections; i++) {
1750         s = s1->sections[i];
1751         if (0 == (s->sh_flags & SHF_ALLOC))
1752             continue;
1753         length = s->data_offset;
1754         // printf("%-12s %08x %04x\n", s->name, s->sh_addr, length);
1755         ptr = (void*)(uplong)s->sh_addr;
1756         if (NULL == s->data || s->sh_type == SHT_NOBITS)
1757             memset(ptr, 0, length);
1758         else
1759             memcpy(ptr, s->data, length);
1760         /* mark executable sections as executable in memory */
1761         if (s->sh_flags & SHF_EXECINSTR)
1762             set_pages_executable(ptr, length);
1763     }
1764 #ifndef TCC_TARGET_PE
1765 #ifdef TCC_TARGET_X86_64
1766     set_pages_executable(s1->runtime_plt_and_got,
1767                          s1->runtime_plt_and_got_offset);
1768 #endif
1769 #endif
1770     return 0;
1771 }
1772
1773 /* launch the compiled program with the given arguments */
1774 int tcc_run(TCCState *s1, int argc, char **argv)
1775 {
1776     int (*prog_main)(int, char **);
1777     void *ptr;
1778     int ret;
1779
1780     ret = tcc_relocate(s1, NULL);
1781     if (ret < 0)
1782         return -1;
1783     ptr = tcc_malloc(ret);
1784     tcc_relocate(s1, ptr);
1785
1786     prog_main = tcc_get_symbol_err(s1, "main");
1787
1788     if (s1->do_debug) {
1789 #ifdef CONFIG_TCC_BACKTRACE
1790         struct sigaction sigact;
1791         /* install TCC signal handlers to print debug info on fatal
1792            runtime errors */
1793         sigact.sa_flags = SA_SIGINFO | SA_RESETHAND;
1794         sigact.sa_sigaction = sig_error;
1795         sigemptyset(&sigact.sa_mask);
1796         sigaction(SIGFPE, &sigact, NULL);
1797         sigaction(SIGILL, &sigact, NULL);
1798         sigaction(SIGSEGV, &sigact, NULL);
1799         sigaction(SIGBUS, &sigact, NULL);
1800         sigaction(SIGABRT, &sigact, NULL);
1801 #else
1802         error("debug mode not available");
1803 #endif
1804     }
1805
1806 #ifdef CONFIG_TCC_BCHECK
1807     if (s1->do_bounds_check) {
1808         void (*bound_init)(void);
1809         void (*bound_exit)(void);
1810         /* set error function */
1811         rt_bound_error_msg = tcc_get_symbol_err(s1, "__bound_error_msg");
1812         rt_prog_main = (unsigned long)prog_main;
1813         /* XXX: use .init section so that it also work in binary ? */
1814         bound_init = tcc_get_symbol_err(s1, "__bound_init");
1815         bound_exit = tcc_get_symbol_err(s1, "__bound_exit");
1816         bound_init();
1817         ret = (*prog_main)(argc, argv);
1818         bound_exit();
1819     } else
1820 #endif
1821     ret = (*prog_main)(argc, argv);
1822     tcc_free(ptr);
1823     return ret;
1824 }
1825
1826 void tcc_memstats(void)
1827 {
1828 #ifdef MEM_DEBUG
1829     printf("memory in use: %d\n", mem_cur_size);
1830 #endif
1831 }
1832
1833 static void tcc_cleanup(void)
1834 {
1835     int i, n;
1836
1837     if (NULL == tcc_state)
1838         return;
1839     tcc_state = NULL;
1840
1841     /* free -D defines */
1842     free_defines(NULL);
1843
1844     /* free tokens */
1845     n = tok_ident - TOK_IDENT;
1846     for(i = 0; i < n; i++)
1847         tcc_free(table_ident[i]);
1848     tcc_free(table_ident);
1849
1850     /* free sym_pools */
1851     dynarray_reset(&sym_pools, &nb_sym_pools);
1852     /* string buffer */
1853     cstr_free(&tokcstr);
1854     /* reset symbol stack */
1855     sym_free_first = NULL;
1856     /* cleanup from error/setjmp */
1857     macro_ptr = NULL;
1858 }
1859
1860 TCCState *tcc_new(void)
1861 {
1862     TCCState *s;
1863
1864     tcc_cleanup();
1865
1866     s = tcc_mallocz(sizeof(TCCState));
1867     if (!s)
1868         return NULL;
1869     tcc_state = s;
1870     s->output_type = TCC_OUTPUT_MEMORY;
1871     s->tcc_lib_path = CONFIG_TCCDIR;
1872
1873     preprocess_new();
1874
1875     /* we add dummy defines for some special macros to speed up tests
1876        and to have working defined() */
1877     define_push(TOK___LINE__, MACRO_OBJ, NULL, NULL);
1878     define_push(TOK___FILE__, MACRO_OBJ, NULL, NULL);
1879     define_push(TOK___DATE__, MACRO_OBJ, NULL, NULL);
1880     define_push(TOK___TIME__, MACRO_OBJ, NULL, NULL);
1881
1882     /* standard defines */
1883     tcc_define_symbol(s, "__STDC__", NULL);
1884     tcc_define_symbol(s, "__STDC_VERSION__", "199901L");
1885 #if defined(TCC_TARGET_I386)
1886     tcc_define_symbol(s, "__i386__", NULL);
1887 #endif
1888 #if defined(TCC_TARGET_X86_64)
1889     tcc_define_symbol(s, "__x86_64__", NULL);
1890 #endif
1891 #if defined(TCC_TARGET_ARM)
1892     tcc_define_symbol(s, "__ARM_ARCH_4__", NULL);
1893     tcc_define_symbol(s, "__arm_elf__", NULL);
1894     tcc_define_symbol(s, "__arm_elf", NULL);
1895     tcc_define_symbol(s, "arm_elf", NULL);
1896     tcc_define_symbol(s, "__arm__", NULL);
1897     tcc_define_symbol(s, "__arm", NULL);
1898     tcc_define_symbol(s, "arm", NULL);
1899     tcc_define_symbol(s, "__APCS_32__", NULL);
1900 #endif
1901 #ifdef TCC_TARGET_PE
1902     tcc_define_symbol(s, "_WIN32", NULL);
1903 #ifdef TCC_TARGET_X86_64
1904     tcc_define_symbol(s, "_WIN64", NULL);
1905 #endif
1906 #else
1907     tcc_define_symbol(s, "__unix__", NULL);
1908     tcc_define_symbol(s, "__unix", NULL);
1909 #if defined(__linux)
1910     tcc_define_symbol(s, "__linux__", NULL);
1911     tcc_define_symbol(s, "__linux", NULL);
1912 #endif
1913 #endif
1914     /* tiny C specific defines */
1915     tcc_define_symbol(s, "__TINYC__", NULL);
1916
1917     /* tiny C & gcc defines */
1918     tcc_define_symbol(s, "__SIZE_TYPE__", "unsigned int");
1919     tcc_define_symbol(s, "__PTRDIFF_TYPE__", "int");
1920 #ifdef TCC_TARGET_PE
1921     tcc_define_symbol(s, "__WCHAR_TYPE__", "unsigned short");
1922 #else
1923     tcc_define_symbol(s, "__WCHAR_TYPE__", "int");
1924 #endif
1925
1926 #ifndef TCC_TARGET_PE
1927     /* default library paths */
1928     tcc_add_library_path(s, CONFIG_SYSROOT "/usr/local/lib");
1929     tcc_add_library_path(s, CONFIG_SYSROOT "/usr/lib");
1930     tcc_add_library_path(s, CONFIG_SYSROOT "/lib");
1931 #endif
1932
1933     /* no section zero */
1934     dynarray_add((void ***)&s->sections, &s->nb_sections, NULL);
1935
1936     /* create standard sections */
1937     text_section = new_section(s, ".text", SHT_PROGBITS, SHF_ALLOC | SHF_EXECINSTR);
1938     data_section = new_section(s, ".data", SHT_PROGBITS, SHF_ALLOC | SHF_WRITE);
1939     bss_section = new_section(s, ".bss", SHT_NOBITS, SHF_ALLOC | SHF_WRITE);
1940
1941     /* symbols are always generated for linking stage */
1942     symtab_section = new_symtab(s, ".symtab", SHT_SYMTAB, 0,
1943                                 ".strtab",
1944                                 ".hashtab", SHF_PRIVATE);
1945     strtab_section = symtab_section->link;
1946
1947     /* private symbol table for dynamic symbols */
1948     s->dynsymtab_section = new_symtab(s, ".dynsymtab", SHT_SYMTAB, SHF_PRIVATE,
1949                                       ".dynstrtab",
1950                                       ".dynhashtab", SHF_PRIVATE);
1951     s->alacarte_link = 1;
1952
1953 #ifdef CHAR_IS_UNSIGNED
1954     s->char_is_unsigned = 1;
1955 #endif
1956 #if defined(TCC_TARGET_PE) && 0
1957     /* XXX: currently the PE linker is not ready to support that */
1958     s->leading_underscore = 1;
1959 #endif
1960     return s;
1961 }
1962
1963 void tcc_delete(TCCState *s1)
1964 {
1965     int i;
1966
1967     tcc_cleanup();
1968
1969     /* free all sections */
1970     for(i = 1; i < s1->nb_sections; i++)
1971         free_section(s1->sections[i]);
1972     dynarray_reset(&s1->sections, &s1->nb_sections);
1973
1974     for(i = 0; i < s1->nb_priv_sections; i++)
1975         free_section(s1->priv_sections[i]);
1976     dynarray_reset(&s1->priv_sections, &s1->nb_priv_sections);
1977
1978     /* free any loaded DLLs */
1979     for ( i = 0; i < s1->nb_loaded_dlls; i++) {
1980         DLLReference *ref = s1->loaded_dlls[i];
1981         if ( ref->handle )
1982             dlclose(ref->handle);
1983     }
1984
1985     /* free loaded dlls array */
1986     dynarray_reset(&s1->loaded_dlls, &s1->nb_loaded_dlls);
1987
1988     /* free library paths */
1989     dynarray_reset(&s1->library_paths, &s1->nb_library_paths);
1990
1991     /* free include paths */
1992     dynarray_reset(&s1->cached_includes, &s1->nb_cached_includes);
1993     dynarray_reset(&s1->include_paths, &s1->nb_include_paths);
1994     dynarray_reset(&s1->sysinclude_paths, &s1->nb_sysinclude_paths);
1995
1996     tcc_free(s1);
1997 }
1998
1999 int tcc_add_include_path(TCCState *s1, const char *pathname)
2000 {
2001     char *pathname1;
2002
2003     pathname1 = tcc_strdup(pathname);
2004     dynarray_add((void ***)&s1->include_paths, &s1->nb_include_paths, pathname1);
2005     return 0;
2006 }
2007
2008 int tcc_add_sysinclude_path(TCCState *s1, const char *pathname)
2009 {
2010     char *pathname1;
2011
2012     pathname1 = tcc_strdup(pathname);
2013     dynarray_add((void ***)&s1->sysinclude_paths, &s1->nb_sysinclude_paths, pathname1);
2014     return 0;
2015 }
2016
2017 static int tcc_add_file_internal(TCCState *s1, const char *filename, int flags)
2018 {
2019     const char *ext;
2020     ElfW(Ehdr) ehdr;
2021     int fd, ret, size;
2022     BufferedFile *saved_file;
2023
2024     ret = -1;
2025
2026     /* find source file type with extension */
2027     ext = tcc_fileextension(filename);
2028     if (ext[0])
2029         ext++;
2030
2031     /* open the file */
2032     saved_file = file;
2033     file = tcc_open(s1, filename);
2034     if (!file) {
2035         if (flags & AFF_PRINT_ERROR)
2036             error_noabort("file '%s' not found", filename);
2037         goto the_end;
2038     }
2039
2040     if (flags & AFF_PREPROCESS) {
2041         ret = tcc_preprocess(s1);
2042         goto the_end;
2043     }
2044
2045     if (!ext[0] || !PATHCMP(ext, "c")) {
2046         /* C file assumed */
2047         ret = tcc_compile(s1);
2048         goto the_end;
2049     }
2050
2051 #ifdef CONFIG_TCC_ASM
2052     if (!strcmp(ext, "S")) {
2053         /* preprocessed assembler */
2054         ret = tcc_assemble(s1, 1);
2055         goto the_end;
2056     }
2057
2058     if (!strcmp(ext, "s")) {
2059         /* non preprocessed assembler */
2060         ret = tcc_assemble(s1, 0);
2061         goto the_end;
2062     }
2063 #endif
2064
2065     fd = file->fd;
2066     /* assume executable format: auto guess file type */
2067     size = read(fd, &ehdr, sizeof(ehdr));
2068     lseek(fd, 0, SEEK_SET);
2069     if (size <= 0) {
2070         error_noabort("could not read header");
2071         goto the_end;
2072     }
2073
2074     if (size == sizeof(ehdr) &&
2075         ehdr.e_ident[0] == ELFMAG0 &&
2076         ehdr.e_ident[1] == ELFMAG1 &&
2077         ehdr.e_ident[2] == ELFMAG2 &&
2078         ehdr.e_ident[3] == ELFMAG3) {
2079
2080         /* do not display line number if error */
2081         file->line_num = 0;
2082         if (ehdr.e_type == ET_REL) {
2083             ret = tcc_load_object_file(s1, fd, 0);
2084             goto the_end;
2085
2086         }
2087 #ifndef TCC_TARGET_PE
2088         if (ehdr.e_type == ET_DYN) {
2089             if (s1->output_type == TCC_OUTPUT_MEMORY) {
2090                 void *h;
2091                 h = dlopen(filename, RTLD_GLOBAL | RTLD_LAZY);
2092                 if (h)
2093                     ret = 0;
2094             } else {
2095                 ret = tcc_load_dll(s1, fd, filename,
2096                                    (flags & AFF_REFERENCED_DLL) != 0);
2097             }
2098             goto the_end;
2099         }
2100 #endif
2101         error_noabort("unrecognized ELF file");
2102         goto the_end;
2103     }
2104
2105     if (memcmp((char *)&ehdr, ARMAG, 8) == 0) {
2106         file->line_num = 0; /* do not display line number if error */
2107         ret = tcc_load_archive(s1, fd);
2108         goto the_end;
2109     }
2110
2111 #ifdef TCC_TARGET_COFF
2112     if (*(uint16_t *)(&ehdr) == COFF_C67_MAGIC) {
2113         ret = tcc_load_coff(s1, fd);
2114         goto the_end;
2115     }
2116 #endif
2117
2118 #ifdef TCC_TARGET_PE
2119     ret = pe_load_file(s1, filename, fd);
2120 #else
2121     /* as GNU ld, consider it is an ld script if not recognized */
2122     ret = tcc_load_ldscript(s1);
2123 #endif
2124     if (ret < 0)
2125         error_noabort("unrecognized file type");
2126
2127 the_end:
2128     if (file)
2129         tcc_close(file);
2130     file = saved_file;
2131     return ret;
2132 }
2133
2134 int tcc_add_file(TCCState *s, const char *filename)
2135 {
2136     if (s->output_type == TCC_OUTPUT_PREPROCESS)
2137         return tcc_add_file_internal(s, filename, AFF_PRINT_ERROR | AFF_PREPROCESS);
2138     else
2139         return tcc_add_file_internal(s, filename, AFF_PRINT_ERROR);
2140 }
2141
2142 int tcc_add_library_path(TCCState *s, const char *pathname)
2143 {
2144     char *pathname1;
2145
2146     pathname1 = tcc_strdup(pathname);
2147     dynarray_add((void ***)&s->library_paths, &s->nb_library_paths, pathname1);
2148     return 0;
2149 }
2150
2151 /* find and load a dll. Return non zero if not found */
2152 /* XXX: add '-rpath' option support ? */
2153 static int tcc_add_dll(TCCState *s, const char *filename, int flags)
2154 {
2155     char buf[1024];
2156     int i;
2157
2158     for(i = 0; i < s->nb_library_paths; i++) {
2159         snprintf(buf, sizeof(buf), "%s/%s",
2160                  s->library_paths[i], filename);
2161         if (tcc_add_file_internal(s, buf, flags) == 0)
2162             return 0;
2163     }
2164     return -1;
2165 }
2166
2167 /* the library name is the same as the argument of the '-l' option */
2168 int tcc_add_library(TCCState *s, const char *libraryname)
2169 {
2170     char buf[1024];
2171     int i;
2172
2173     /* first we look for the dynamic library if not static linking */
2174     if (!s->static_link) {
2175 #ifdef TCC_TARGET_PE
2176         if (pe_add_dll(s, libraryname) == 0)
2177             return 0;
2178 #else
2179         snprintf(buf, sizeof(buf), "lib%s.so", libraryname);
2180         if (tcc_add_dll(s, buf, 0) == 0)
2181             return 0;
2182 #endif
2183     }
2184     /* then we look for the static library */
2185     for(i = 0; i < s->nb_library_paths; i++) {
2186         snprintf(buf, sizeof(buf), "%s/lib%s.a",
2187                  s->library_paths[i], libraryname);
2188         if (tcc_add_file_internal(s, buf, 0) == 0)
2189             return 0;
2190     }
2191     return -1;
2192 }
2193
2194 int tcc_add_symbol(TCCState *s, const char *name, void *val)
2195 {
2196     add_elf_sym(symtab_section, (uplong)val, 0,
2197                 ELFW(ST_INFO)(STB_GLOBAL, STT_NOTYPE), 0,
2198                 SHN_ABS, name);
2199     return 0;
2200 }
2201
2202 int tcc_set_output_type(TCCState *s, int output_type)
2203 {
2204     char buf[1024];
2205
2206     s->output_type = output_type;
2207
2208     if (!s->nostdinc) {
2209         /* default include paths */
2210         /* XXX: reverse order needed if -isystem support */
2211 #ifndef TCC_TARGET_PE
2212         tcc_add_sysinclude_path(s, CONFIG_SYSROOT "/usr/local/include");
2213         tcc_add_sysinclude_path(s, CONFIG_SYSROOT "/usr/include");
2214 #endif
2215         snprintf(buf, sizeof(buf), "%s/include", s->tcc_lib_path);
2216         tcc_add_sysinclude_path(s, buf);
2217 #ifdef TCC_TARGET_PE
2218         snprintf(buf, sizeof(buf), "%s/include/winapi", s->tcc_lib_path);
2219         tcc_add_sysinclude_path(s, buf);
2220 #endif
2221     }
2222
2223     /* if bound checking, then add corresponding sections */
2224 #ifdef CONFIG_TCC_BCHECK
2225     if (s->do_bounds_check) {
2226         /* define symbol */
2227         tcc_define_symbol(s, "__BOUNDS_CHECKING_ON", NULL);
2228         /* create bounds sections */
2229         bounds_section = new_section(s, ".bounds",
2230                                      SHT_PROGBITS, SHF_ALLOC);
2231         lbounds_section = new_section(s, ".lbounds",
2232                                       SHT_PROGBITS, SHF_ALLOC);
2233     }
2234 #endif
2235
2236     if (s->char_is_unsigned) {
2237         tcc_define_symbol(s, "__CHAR_UNSIGNED__", NULL);
2238     }
2239
2240     /* add debug sections */
2241     if (s->do_debug) {
2242         /* stab symbols */
2243         stab_section = new_section(s, ".stab", SHT_PROGBITS, 0);
2244         stab_section->sh_entsize = sizeof(Stab_Sym);
2245         stabstr_section = new_section(s, ".stabstr", SHT_STRTAB, 0);
2246         put_elf_str(stabstr_section, "");
2247         stab_section->link = stabstr_section;
2248         /* put first entry */
2249         put_stabs("", 0, 0, 0, 0);
2250     }
2251
2252     /* add libc crt1/crti objects */
2253 #ifndef TCC_TARGET_PE
2254     if ((output_type == TCC_OUTPUT_EXE || output_type == TCC_OUTPUT_DLL) &&
2255         !s->nostdlib) {
2256         if (output_type != TCC_OUTPUT_DLL)
2257             tcc_add_file(s, CONFIG_TCC_CRT_PREFIX "/crt1.o");
2258         tcc_add_file(s, CONFIG_TCC_CRT_PREFIX "/crti.o");
2259     }
2260 #endif
2261
2262 #ifdef TCC_TARGET_PE
2263     snprintf(buf, sizeof(buf), "%s/lib", s->tcc_lib_path);
2264     tcc_add_library_path(s, buf);
2265 #ifdef _WIN32
2266     if (GetSystemDirectory(buf, sizeof buf))
2267         tcc_add_library_path(s, buf);
2268 #endif
2269 #endif
2270
2271     return 0;
2272 }
2273
2274 #define WD_ALL    0x0001 /* warning is activated when using -Wall */
2275 #define FD_INVERT 0x0002 /* invert value before storing */
2276
2277 typedef struct FlagDef {
2278     uint16_t offset;
2279     uint16_t flags;
2280     const char *name;
2281 } FlagDef;
2282
2283 static const FlagDef warning_defs[] = {
2284     { offsetof(TCCState, warn_unsupported), 0, "unsupported" },
2285     { offsetof(TCCState, warn_write_strings), 0, "write-strings" },
2286     { offsetof(TCCState, warn_error), 0, "error" },
2287     { offsetof(TCCState, warn_implicit_function_declaration), WD_ALL,
2288       "implicit-function-declaration" },
2289 };
2290
2291 static int set_flag(TCCState *s, const FlagDef *flags, int nb_flags,
2292                     const char *name, int value)
2293 {
2294     int i;
2295     const FlagDef *p;
2296     const char *r;
2297
2298     r = name;
2299     if (r[0] == 'n' && r[1] == 'o' && r[2] == '-') {
2300         r += 3;
2301         value = !value;
2302     }
2303     for(i = 0, p = flags; i < nb_flags; i++, p++) {
2304         if (!strcmp(r, p->name))
2305             goto found;
2306     }
2307     return -1;
2308  found:
2309     if (p->flags & FD_INVERT)
2310         value = !value;
2311     *(int *)((uint8_t *)s + p->offset) = value;
2312     return 0;
2313 }
2314
2315
2316 /* set/reset a warning */
2317 int tcc_set_warning(TCCState *s, const char *warning_name, int value)
2318 {
2319     int i;
2320     const FlagDef *p;
2321
2322     if (!strcmp(warning_name, "all")) {
2323         for(i = 0, p = warning_defs; i < countof(warning_defs); i++, p++) {
2324             if (p->flags & WD_ALL)
2325                 *(int *)((uint8_t *)s + p->offset) = 1;
2326         }
2327         return 0;
2328     } else {
2329         return set_flag(s, warning_defs, countof(warning_defs),
2330                         warning_name, value);
2331     }
2332 }
2333
2334 static const FlagDef flag_defs[] = {
2335     { offsetof(TCCState, char_is_unsigned), 0, "unsigned-char" },
2336     { offsetof(TCCState, char_is_unsigned), FD_INVERT, "signed-char" },
2337     { offsetof(TCCState, nocommon), FD_INVERT, "common" },
2338     { offsetof(TCCState, leading_underscore), 0, "leading-underscore" },
2339 };
2340
2341 /* set/reset a flag */
2342 int tcc_set_flag(TCCState *s, const char *flag_name, int value)
2343 {
2344     return set_flag(s, flag_defs, countof(flag_defs),
2345                     flag_name, value);
2346 }
2347
2348 /* set CONFIG_TCCDIR at runtime */
2349 void tcc_set_lib_path(TCCState *s, const char *path)
2350 {
2351     s->tcc_lib_path = tcc_strdup(path);
2352 }
2353
2354 void tcc_print_stats(TCCState *s, int64_t total_time)
2355 {
2356     double tt;
2357     tt = (double)total_time / 1000000.0;
2358     if (tt < 0.001)
2359         tt = 0.001;
2360     if (total_bytes < 1)
2361         total_bytes = 1;
2362     printf("%d idents, %d lines, %d bytes, %0.3f s, %d lines/s, %0.1f MB/s\n",
2363            tok_ident - TOK_IDENT, total_lines, total_bytes,
2364            tt, (int)(total_lines / tt),
2365            total_bytes / tt / 1000000.0);
2366 }