lib.c

   1 /*
   2  * 'sparse' library helper routines.
   3  *
   4  * Copyright (C) 2003 Transmeta Corp.
   5  *               2003-2004 Linus Torvalds
   6  *
   7  *  Licensed under the Open Software License version 1.1
   8  */
   9 #include <ctype.h>
  10 #include <fcntl.h>
  11 #include <stdarg.h>
  12 #include <stddef.h>
  13 #include <stdio.h>
  14 #include <stdlib.h>
  15 #include <string.h>
  16 #include <unistd.h>
  17 #include <assert.h>
  18
  19 #include <sys/types.h>
  20
  21 #include "lib.h"
  22 #include "allocate.h"
  23 #include "token.h"
  24 #include "parse.h"
  25 #include "symbol.h"
  26 #include "expression.h"
  27 #include "scope.h"
  28 #include "linearize.h"
  29 #include "target.h"
  30
  31 int verbose, optimize, optimize_size, preprocessing;
  32 int die_if_error = 0;
  33
  34 #ifndef __GNUC__
  35 # define __GNUC__ 2
  36 # define __GNUC_MINOR__ 95
  37 # define __GNUC_PATCHLEVEL__ 0
  38 #endif
  39
  40 int gcc_major = __GNUC__;
  41 int gcc_minor = __GNUC_MINOR__;
  42 int gcc_patchlevel = __GNUC_PATCHLEVEL__;
  43
  44 static const char *gcc_base_dir = GCC_BASE;
  45
  46 struct token *skip_to(struct token *token, int op)
  47 {
  48         while (!match_op(token, op) && !eof_token(token))
  49                 token = token->next;
  50         return token;
  51 }
  52
  53 struct token *expect(struct token *token, int op, const char *where)
  54 {
  55         if (!match_op(token, op)) {
  56                 static struct token bad_token;
  57                 if (token != &bad_token) {
  58                         bad_token.next = token;
  59                         sparse_error(token->pos, "Expected %s %s", show_special(op), where);
  60                         sparse_error(token->pos, "got %s", show_token(token));
  61                 }
  62                 if (op == ';')
  63                         return skip_to(token, op);
  64                 return &bad_token;
  65         }
  66         return token->next;
  67 }
  68
  69 unsigned int hexval(unsigned int c)
  70 {
  71         int retval = 256;
  72         switch (c) {
  73         case '0'...'9':
  74                 retval = c - '0';
  75                 break;
  76         case 'a'...'f':
  77                 retval = c - 'a' + 10;
  78                 break;
  79         case 'A'...'F':
  80                 retval = c - 'A' + 10;
  81                 break;
  82         }
  83         return retval;
  84 }
  85
  86 static void do_warn(const char *type, struct position pos, const char * fmt, va_list args)
  87 {
  88         static char buffer[512];
  89         const char *name;
  90
  91         vsprintf(buffer, fmt, args);
  92         name = stream_name(pos.stream);
  93
  94         fprintf(stderr, "%s:%d:%d: %s%s\n",
  95                 name, pos.line, pos.pos, type, buffer);
  96 }
  97
  98 static int max_warnings = 100;
  99 static int show_info = 1;
 100
 101 void info(struct position pos, const char * fmt, ...)
 102 {
 103         va_list args;
 104
 105         if (!show_info)
 106                 return;
 107         va_start(args, fmt);
 108         do_warn("", pos, fmt, args);
 109         va_end(args);
 110 }
 111
 112 void warning(struct position pos, const char * fmt, ...)
 113 {
 114         va_list args;
 115
 116         if (!max_warnings) {
 117                 show_info = 0;
 118                 return;
 119         }
 120
 121         if (!--max_warnings) {
 122                 show_info = 0;
 123                 fmt = "too many warnings";
 124         }
 125
 126         va_start(args, fmt);
 127         do_warn("warning: ", pos, fmt, args);
 128         va_end(args);
 129 }
 130
 131 static void do_error(struct position pos, const char * fmt, va_list args)
 132 {
 133         static int errors = 0;
 134         die_if_error = 1;
 135         show_info = 1;
 136         /* Shut up warnings after an error */
 137         max_warnings = 0;
 138         if (errors > 100) {
 139                 static int once = 0;
 140                 show_info = 0;
 141                 if (once)
 142                         return;
 143                 fmt = "too many errors";
 144                 once = 1;
 145         }
 146
 147         do_warn("error: ", pos, fmt, args);
 148         errors++;
 149 }
 150
 151 void sparse_error(struct position pos, const char * fmt, ...)
 152 {
 153         va_list args;
 154         va_start(args, fmt);
 155         do_error(pos, fmt, args);
 156         va_end(args);
 157 }
 158
 159 void expression_error(struct expression *expr, const char *fmt, ...)
 160 {
 161         va_list args;
 162         va_start(args, fmt);
 163         do_error(expr->pos, fmt, args);
 164         va_end(args);
 165         expr->ctype = &bad_ctype;
 166 }
 167
 168 void error_die(struct position pos, const char * fmt, ...)
 169 {
 170         va_list args;
 171         va_start(args, fmt);
 172         do_warn("error: ", pos, fmt, args);
 173         va_end(args);
 174         exit(1);
 175 }
 176
 177 void die(const char *fmt, ...)
 178 {
 179         va_list args;
 180         static char buffer[512];
 181
 182         va_start(args, fmt);
 183         vsnprintf(buffer, sizeof(buffer), fmt, args);
 184         va_end(args);
 185
 186         fprintf(stderr, "%s\n", buffer);
 187         exit(1);
 188 }
 189
 190 static struct token *pre_buffer_begin = NULL;
 191 static struct token *pre_buffer_end = NULL;
 192
 193 int Waddress_space = 1;
 194 int Wbitwise = 0;
 195 int Wcast_to_as = 0;
 196 int Wcast_truncate = 1;
 197 int Wcontext = 1;
 198 int Wdecl = 1;
 199 int Wdefault_bitfield_sign = 0;
 200 int Wdo_while = 0;
 201 int Wenum_mismatch = 1;
 202 int Wnon_pointer_null = 1;
 203 int Wold_initializer = 1;
 204 int Wone_bit_signed_bitfield = 1;
 205 int Wparen_string = 0;
 206 int Wptr_subtraction_blows = 0;
 207 int Wreturn_void = 0;
 208 int Wshadow = 0;
 209 int Wtransparent_union = 0;
 210 int Wtypesign = 0;
 211 int Wundef = 0;
 212 int Wuninitialized = 1;
 213 int Wdeclarationafterstatement = -1;
 214
 215 int dbg_entry = 0;
 216 int dbg_dead = 0;
 217
 218 int preprocess_only;
 219
 220 static enum { STANDARD_C89,
 221               STANDARD_C94,
 222               STANDARD_C99,
 223               STANDARD_GNU89,
 224               STANDARD_GNU99, } standard = STANDARD_GNU89;
 225
 226 #define CMDLINE_INCLUDE 20
 227 int cmdline_include_nr = 0;
 228 struct cmdline_include cmdline_include[CMDLINE_INCLUDE];
 229
 230
 231 void add_pre_buffer(const char *fmt, ...)
 232 {
 233         va_list args;
 234         unsigned int size;
 235         struct token *begin, *end;
 236         char buffer[4096];
 237
 238         va_start(args, fmt);
 239         size = vsnprintf(buffer, sizeof(buffer), fmt, args);
 240         va_end(args);
 241         begin = tokenize_buffer(buffer, size, &end);
 242         if (!pre_buffer_begin)
 243                 pre_buffer_begin = begin;
 244         if (pre_buffer_end)
 245                 pre_buffer_end->next = begin;
 246         pre_buffer_end = end;
 247 }
 248
 249 static char **handle_switch_D(char *arg, char **next)
 250 {
 251         const char *name = arg + 1;
 252         const char *value = "1";
 253
 254         if (!*name || isspace(*name))
 255                 die("argument to `-D' is missing");
 256
 257         for (;;) {
 258                 char c;
 259                 c = *++arg;
 260                 if (!c)
 261                         break;
 262                 if (isspace((unsigned char)c) || c == '=') {
 263                         *arg = '\0';
 264                         value = arg + 1;
 265                         break;
 266                 }
 267         }
 268         add_pre_buffer("#define %s %s\n", name, value);
 269         return next;
 270 }
 271
 272 static char **handle_switch_E(char *arg, char **next)
 273 {
 274         if (arg[1] == '\0')
 275                 preprocess_only = 1;
 276         return next;
 277 }
 278
 279 static char **handle_switch_I(char *arg, char **next)
 280 {
 281         char *path = arg+1;
 282
 283         switch (arg[1]) {
 284         case '-':
 285                 add_pre_buffer("#split_include\n");
 286                 break;
 287
 288         case '\0':      /* Plain "-I" */
 289                 path = *++next;
 290                 if (!path)
 291                         die("missing argument for -I option");
 292                 /* Fall through */
 293         default:
 294                 add_pre_buffer("#add_include \"%s/\"\n", path);
 295         }
 296         return next;
 297 }
 298
 299 static void add_cmdline_include(char *filename)
 300 {
 301         int fd = open(filename, O_RDONLY);
 302         if (fd < 0) {
 303                 perror(filename);
 304                 return;
 305         }
 306         if (cmdline_include_nr >= CMDLINE_INCLUDE)
 307                 die("too many include files for %s\n", filename);
 308         cmdline_include[cmdline_include_nr].filename = filename;
 309         cmdline_include[cmdline_include_nr].fd = fd;
 310         cmdline_include_nr++;
 311 }
 312
 313 static char **handle_switch_i(char *arg, char **next)
 314 {
 315         if (*next && !strcmp(arg, "include"))
 316                 add_cmdline_include(*++next);
 317         else if (*next && !strcmp(arg, "imacros"))
 318                 add_cmdline_include(*++next);
 319         else if (*next && !strcmp(arg, "isystem")) {
 320                 char *path = *++next;
 321                 if (!path)
 322                         die("missing argument for -isystem option");
 323                 add_pre_buffer("#add_isystem \"%s/\"\n", path);
 324         } else if (*next && !strcmp(arg, "idirafter")) {
 325                 char *path = *++next;
 326                 if (!path)
 327                         die("missing argument for -idirafter option");
 328                 add_pre_buffer("#add_dirafter \"%s/\"\n", path);
 329         }
 330         return next;
 331 }
 332
 333 static char **handle_switch_M(char *arg, char **next)
 334 {
 335         if (!strcmp(arg, "MF") || !strcmp(arg,"MQ") || !strcmp(arg,"MT")) {
 336                 if (!*next)
 337                         die("missing argument for -%s option", arg);
 338                 return next + 1;
 339         }
 340         return next;
 341 }
 342
 343 static char **handle_switch_m(char *arg, char **next)
 344 {
 345         if (!strcmp(arg, "m64")) {
 346                 bits_in_long = 64;
 347                 max_int_alignment = 8;
 348                 bits_in_pointer = 64;
 349                 pointer_alignment = 8;
 350                 size_t_ctype = &ulong_ctype;
 351                 ssize_t_ctype = &long_ctype;
 352         } else if (!strcmp(arg, "msize-long")) {
 353                 size_t_ctype = &ulong_ctype;
 354                 ssize_t_ctype = &long_ctype;
 355         }
 356         return next;
 357 }
 358
 359 static char **handle_switch_o(char *arg, char **next)
 360 {
 361         if (!strcmp (arg, "o")) {       // "-o foo"
 362                 if (!*++next)
 363                         die("argument to '-o' is missing");
 364         }
 365         // else "-ofoo"
 366
 367         return next;
 368 }
 369
 370 static const struct warning {
 371         const char *name;
 372         int *flag;
 373 } warnings[] = {
 374         { "address-space", &Waddress_space },
 375         { "bitwise", &Wbitwise },
 376         { "cast-to-as", &Wcast_to_as },
 377         { "cast-truncate", &Wcast_truncate },
 378         { "context", &Wcontext },
 379         { "decl", &Wdecl },
 380         { "default-bitfield-sign", &Wdefault_bitfield_sign },
 381         { "do-while", &Wdo_while },
 382         { "enum-mismatch", &Wenum_mismatch },
 383         { "non-pointer-null", &Wnon_pointer_null },
 384         { "old-initializer", &Wold_initializer },
 385         { "one-bit-signed-bitfield", &Wone_bit_signed_bitfield },
 386         { "paren-string", &Wparen_string },
 387         { "ptr-subtraction-blows", &Wptr_subtraction_blows },
 388         { "return-void", &Wreturn_void },
 389         { "shadow", &Wshadow },
 390         { "transparent-union", &Wtransparent_union },
 391         { "typesign", &Wtypesign },
 392         { "undef", &Wundef },
 393         { "uninitialized", &Wuninitialized },
 394         { "declaration-after-statement", &Wdeclarationafterstatement },
 395 };
 396
 397 enum {
 398         WARNING_OFF,
 399         WARNING_ON,
 400         WARNING_FORCE_OFF
 401 };
 402
 403
 404 static char **handle_onoff_switch(char *arg, char **next, const struct warning warnings[], int n)
 405 {
 406         int flag = WARNING_ON;
 407         char *p = arg + 1;
 408         unsigned i;
 409
 410         if (!strcmp(p, "all")) {
 411                 for (i = 0; i < n; i++) {
 412                         if (*warnings[i].flag != WARNING_FORCE_OFF)
 413                                 *warnings[i].flag = WARNING_ON;
 414                 }
 415         }
 416
 417         // Prefixes "no" and "no-" mean to turn warning off.
 418         if (p[0] == 'n' && p[1] == 'o') {
 419                 p += 2;
 420                 if (p[0] == '-')
 421                         p++;
 422                 flag = WARNING_FORCE_OFF;
 423         }
 424
 425         for (i = 0; i < n; i++) {
 426                 if (!strcmp(p,warnings[i].name)) {
 427                         *warnings[i].flag = flag;
 428                         return next;
 429                 }
 430         }
 431
 432         // Unknown.
 433         return NULL;
 434 }
 435
 436 static char **handle_switch_W(char *arg, char **next)
 437 {
 438         char ** ret = handle_onoff_switch(arg, next, warnings, sizeof warnings/sizeof warnings[0]);
 439         if (ret)
 440                 return ret;
 441
 442         // Unknown.
 443         return next;
 444 }
 445
 446 static struct warning debugs[] = {
 447         { "entry", &dbg_entry},
 448         { "dead", &dbg_dead},
 449 };
 450
 451
 452 static char **handle_switch_v(char *arg, char **next)
 453 {
 454         char ** ret = handle_onoff_switch(arg, next, debugs, sizeof debugs/sizeof debugs[0]);
 455         if (ret)
 456                 return ret;
 457
 458         // Unknown.
 459         do {
 460                 verbose++;
 461         } while (*++arg == 'v');
 462         return next;
 463 }
 464
 465
 466 static void handle_onoff_switch_finalize(const struct warning warnings[], int n)
 467 {
 468         unsigned i;
 469
 470         for (i = 0; i < n; i++) {
 471                 if (*warnings[i].flag == WARNING_FORCE_OFF)
 472                         *warnings[i].flag = WARNING_OFF;
 473         }
 474 }
 475
 476 static void handle_switch_W_finalize(void)
 477 {
 478         handle_onoff_switch_finalize(warnings, sizeof(warnings) / sizeof(warnings[0]));
 479
 480         /* default Wdeclarationafterstatement based on the C dialect */
 481         if (-1 == Wdeclarationafterstatement)
 482         {
 483                 switch (standard)
 484                 {
 485                         case STANDARD_C89:
 486                         case STANDARD_C94:
 487                                 Wdeclarationafterstatement = 1;
 488                                 break;
 489
 490                         case STANDARD_C99:
 491                         case STANDARD_GNU89:
 492                         case STANDARD_GNU99:
 493                                 Wdeclarationafterstatement = 0;
 494                                 break;
 495
 496                         default:
 497                                 assert (0);
 498                 }
 499
 500         }
 501 }
 502
 503 static void handle_switch_v_finalize(void)
 504 {
 505         handle_onoff_switch_finalize(debugs, sizeof(debugs) / sizeof(debugs[0]));
 506 }
 507
 508 static char **handle_switch_U(char *arg, char **next)
 509 {
 510         const char *name = arg + 1;
 511         add_pre_buffer ("#undef %s\n", name);
 512         return next;
 513 }
 514
 515 static char **handle_switch_O(char *arg, char **next)
 516 {
 517         int level = 1;
 518         if (arg[1] >= '0' && arg[1] <= '9')
 519                 level = arg[1] - '0';
 520         optimize = level;
 521         optimize_size = arg[1] == 's';
 522         return next;
 523 }
 524
 525 static char **handle_switch_ftabstop(char *arg, char **next)
 526 {
 527         char *end;
 528         unsigned long val;
 529
 530         if (*arg == '\0')
 531                 die("error: missing argument to \"-ftabstop=\"");
 532
 533         /* we silently ignore silly values */
 534         val = strtoul(arg, &end, 10);
 535         if (*end == '\0' && 1 <= val && val <= 100)
 536                 tabstop = val;
 537
 538         return next;
 539 }
 540
 541 static char **handle_switch_f(char *arg, char **next)
 542 {
 543         int flag = 1;
 544
 545         arg++;
 546
 547         if (!strncmp(arg, "tabstop=", 8))
 548                 return handle_switch_ftabstop(arg+8, next);
 549
 550         /* handle switches w/ arguments above, boolean and only boolean below */
 551
 552         if (!strncmp(arg, "no-", 3)) {
 553                 flag = 0;
 554                 arg += 3;
 555         }
 556         /* handle switch here.. */
 557         return next;
 558 }
 559
 560 static char **handle_switch_G(char *arg, char **next)
 561 {
 562         if (!strcmp (arg, "G") && *next)
 563                 return next + 1; // "-G 0"
 564         else
 565                 return next;     // "-G0" or (bogus) terminal "-G"
 566 }
 567
 568 static char **handle_switch_a(char *arg, char **next)
 569 {
 570         if (!strcmp (arg, "ansi"))
 571                 standard = STANDARD_C89;
 572
 573         return next;
 574 }
 575
 576 static char **handle_switch_s(char *arg, char **next)
 577 {
 578         if (!strncmp (arg, "std=", 4))
 579         {
 580                 arg += 4;
 581
 582                 if (!strcmp (arg, "c89") ||
 583                     !strcmp (arg, "iso9899:1990"))
 584                         standard = STANDARD_C89;
 585
 586                 else if (!strcmp (arg, "iso9899:199409"))
 587                         standard = STANDARD_C94;
 588
 589                 else if (!strcmp (arg, "c99") ||
 590                          !strcmp (arg, "c9x") ||
 591                          !strcmp (arg, "iso9899:1999") ||
 592                          !strcmp (arg, "iso9899:199x"))
 593                         standard = STANDARD_C99;
 594
 595                 else if (!strcmp (arg, "gnu89"))
 596                         standard = STANDARD_GNU89;
 597
 598                 else if (!strcmp (arg, "gnu99") || !strcmp (arg, "gnu9x"))
 599                         standard = STANDARD_GNU99;
 600
 601                 else
 602                         die ("Unsupported C dialect");
 603         }
 604
 605         return next;
 606 }
 607
 608 static char **handle_nostdinc(char *arg, char **next)
 609 {
 610         add_pre_buffer("#nostdinc\n");
 611         return next;
 612 }
 613
 614 static char **handle_base_dir(char *arg, char **next)
 615 {
 616         gcc_base_dir = *++next;
 617         if (!gcc_base_dir)
 618                 die("missing argument for -gcc-base-dir option");
 619         return next;
 620 }
 621
 622 struct switches {
 623         const char *name;
 624         char **(*fn)(char *, char **);
 625 };
 626
 627 static char **handle_switch(char *arg, char **next)
 628 {
 629         static struct switches cmd[] = {
 630                 { "nostdinc", handle_nostdinc },
 631                 { "gcc-base-dir", handle_base_dir},
 632                 { NULL, NULL }
 633         };
 634         struct switches *s;
 635
 636         switch (*arg) {
 637         case 'D': return handle_switch_D(arg, next);
 638         case 'E': return handle_switch_E(arg, next);
 639         case 'I': return handle_switch_I(arg, next);
 640         case 'i': return handle_switch_i(arg, next);
 641         case 'M': return handle_switch_M(arg, next);
 642         case 'm': return handle_switch_m(arg, next);
 643         case 'o': return handle_switch_o(arg, next);
 644         case 'U': return handle_switch_U(arg, next);
 645         case 'v': return handle_switch_v(arg, next);
 646         case 'W': return handle_switch_W(arg, next);
 647         case 'O': return handle_switch_O(arg, next);
 648         case 'f': return handle_switch_f(arg, next);
 649         case 'G': return handle_switch_G(arg, next);
 650         case 'a': return handle_switch_a(arg, next);
 651         case 's': return handle_switch_s(arg, next);
 652         default:
 653                 break;
 654         }
 655
 656         s = cmd;
 657         while (s->name) {
 658                 if (!strcmp(s->name, arg))
 659                         return s->fn(arg, next);
 660                 s++;
 661         }
 662
 663         /*
 664          * Ignore unknown command line options:
 665          * they're probably gcc switches
 666          */
 667         return next;
 668 }
 669
 670 void declare_builtin_functions(void)
 671 {
 672         /* Gaah. gcc knows tons of builtin <string.h> functions */
 673         add_pre_buffer("extern void *__builtin_memcpy(void *, const void *, __SIZE_TYPE__);\n");
 674         add_pre_buffer("extern void *__builtin_mempcpy(void *, const void *, __SIZE_TYPE__);\n");
 675         add_pre_buffer("extern void *__builtin_memset(void *, int, __SIZE_TYPE__);\n");
 676         add_pre_buffer("extern int __builtin_memcmp(const void *, const void *, __SIZE_TYPE__);\n");
 677         add_pre_buffer("extern char *__builtin_strcat(char *, const char *);\n");
 678         add_pre_buffer("extern char *__builtin_strncat(char *, const char *, __SIZE_TYPE__);\n");
 679         add_pre_buffer("extern int __builtin_strcmp(const char *, const char *);\n");
 680         add_pre_buffer("extern char *__builtin_strchr(const char *, int);\n");
 681         add_pre_buffer("extern char *__builtin_strcpy(char *, const char *);\n");
 682         add_pre_buffer("extern char *__builtin_strncpy(char *, const char *, __SIZE_TYPE__);\n");
 683         add_pre_buffer("extern __SIZE_TYPE__ __builtin_strspn(const char *, const char *);\n");
 684         add_pre_buffer("extern __SIZE_TYPE__ __builtin_strcspn(const char *, const char *);\n");
 685         add_pre_buffer("extern char * __builtin_strpbrk(const char *, const char *);\n");
 686         add_pre_buffer("extern __SIZE_TYPE__ __builtin_strlen(const char *);\n");
 687
 688         /* And bitwise operations.. */
 689         add_pre_buffer("extern int __builtin_clz(int);\n");
 690         add_pre_buffer("extern int __builtin_clzl(long);\n");
 691         add_pre_buffer("extern int __builtin_clzll(long long);\n");
 692         add_pre_buffer("extern int __builtin_ctz(int);\n");
 693         add_pre_buffer("extern int __builtin_ctzl(long);\n");
 694         add_pre_buffer("extern int __builtin_ctzll(long long);\n");
 695         add_pre_buffer("extern int __builtin_ffs(int);\n");
 696         add_pre_buffer("extern int __builtin_ffsl(long);\n");
 697         add_pre_buffer("extern int __builtin_ffsll(long long);\n");
 698         add_pre_buffer("extern int __builtin_popcount(unsigned int);\n");
 699         add_pre_buffer("extern int __builtin_popcountl(unsigned long);\n");
 700         add_pre_buffer("extern int __builtin_popcountll(unsigned long long);\n");
 701
 702         /* And some random ones.. */
 703         add_pre_buffer("extern void *__builtin_return_address(unsigned int);\n");
 704         add_pre_buffer("extern void *__builtin_extract_return_addr(void *);\n");
 705         add_pre_buffer("extern void *__builtin_frame_address(unsigned int);\n");
 706         add_pre_buffer("extern void __builtin_trap(void);\n");
 707         add_pre_buffer("extern void *__builtin_alloca(__SIZE_TYPE__);\n");
 708         add_pre_buffer("extern void __builtin_prefetch (const void *, ...);\n");
 709         add_pre_buffer("extern long __builtin_alpha_extbl(long, long);\n");
 710         add_pre_buffer("extern long __builtin_alpha_extwl(long, long);\n");
 711         add_pre_buffer("extern long __builtin_alpha_insbl(long, long);\n");
 712         add_pre_buffer("extern long __builtin_alpha_inswl(long, long);\n");
 713         add_pre_buffer("extern long __builtin_alpha_insql(long, long);\n");
 714         add_pre_buffer("extern long __builtin_alpha_inslh(long, long);\n");
 715         add_pre_buffer("extern long __builtin_alpha_cmpbge(long, long);\n");
 716         add_pre_buffer("extern long __builtin_labs(long);\n");
 717
 718         /* And some floating point stuff.. */
 719         add_pre_buffer("extern int __builtin_isgreater(float, float);\n");
 720         add_pre_buffer("extern int __builtin_isgreaterequal(float, float);\n");
 721         add_pre_buffer("extern int __builtin_isless(float, float);\n");
 722         add_pre_buffer("extern int __builtin_islessequal(float, float);\n");
 723         add_pre_buffer("extern int __builtin_islessgreater(float, float);\n");
 724         add_pre_buffer("extern int __builtin_isunordered(float, float);\n");
 725
 726         /* And some __FORTIFY_SOURCE ones.. */
 727         add_pre_buffer ("extern __SIZE_TYPE__ __builtin_object_size(void *, int);\n");
 728         add_pre_buffer ("extern void * __builtin___memcpy_chk(void *, const void *, __SIZE_TYPE__, __SIZE_TYPE__);\n");
 729         add_pre_buffer ("extern void * __builtin___memmove_chk(void *, const void *, __SIZE_TYPE__, __SIZE_TYPE__);\n");
 730         add_pre_buffer ("extern void * __builtin___mempcpy_chk(void *, const void *, __SIZE_TYPE__, __SIZE_TYPE__);\n");
 731         add_pre_buffer ("extern void * __builtin___memset_chk(void *, int, __SIZE_TYPE__, __SIZE_TYPE__);\n");
 732         add_pre_buffer ("extern int __builtin___sprintf_chk(char *, int, __SIZE_TYPE__, const char *, ...);\n");
 733         add_pre_buffer ("extern int __builtin___snprintf_chk(char *, __SIZE_TYPE__, int , __SIZE_TYPE__, const char *, ...);\n");
 734         add_pre_buffer ("extern char * __builtin___stpcpy_chk(char *, const char *, __SIZE_TYPE__);\n");
 735         add_pre_buffer ("extern char * __builtin___strcat_chk(char *, const char *, __SIZE_TYPE__);\n");
 736         add_pre_buffer ("extern char * __builtin___strcpy_chk(char *, const char *, __SIZE_TYPE__);\n");
 737         add_pre_buffer ("extern char * __builtin___strncat_chk(char *, const char *, __SIZE_TYPE__, __SIZE_TYPE__);\n");
 738         add_pre_buffer ("extern char * __builtin___strncpy_chk(char *, const char *, __SIZE_TYPE__, __SIZE_TYPE__);\n");
 739         add_pre_buffer ("extern int __builtin___vsprintf_chk(char *, int, __SIZE_TYPE__, const char *, __builtin_va_list);\n");
 740         add_pre_buffer ("extern int __builtin___vsnprintf_chk(char *, __SIZE_TYPE__, int, __SIZE_TYPE__, const char *, __builtin_va_list ap);\n");
 741 }
 742
 743 void create_builtin_stream(void)
 744 {
 745         add_pre_buffer("#weak_define __GNUC__ %d\n", gcc_major);
 746         add_pre_buffer("#weak_define __GNUC_MINOR__ %d\n", gcc_minor);
 747         add_pre_buffer("#weak_define __GNUC_PATCHLEVEL__ %d\n", gcc_patchlevel);
 748
 749         /* We add compiler headers path here because we have to parse
 750          * the arguments to get it, falling back to default. */
 751         add_pre_buffer("#add_system \"%s/include\"\n", gcc_base_dir);
 752         add_pre_buffer("#add_system \"%s/include-fixed\"\n", gcc_base_dir);
 753
 754         add_pre_buffer("#define __extension__\n");
 755         add_pre_buffer("#define __pragma__\n");
 756
 757         // gcc defines __SIZE_TYPE__ to be size_t.  For linux/i86 and
 758         // solaris/sparc that is really "unsigned int" and for linux/x86_64
 759         // it is "long unsigned int".  In either case we can probably
 760         // get away with this.  We need the #weak_define as cgcc will define
 761         // the right __SIZE_TYPE__.
 762         if (size_t_ctype == &ulong_ctype)
 763                 add_pre_buffer("#weak_define __SIZE_TYPE__ long unsigned int\n");
 764         else
 765                 add_pre_buffer("#weak_define __SIZE_TYPE__ unsigned int\n");
 766         add_pre_buffer("#weak_define __STDC__ 1\n");
 767
 768         switch (standard)
 769         {
 770                 case STANDARD_C89:
 771                         add_pre_buffer("#weak_define __STRICT_ANSI__\n");
 772                         break;
 773
 774                 case STANDARD_C94:
 775                         add_pre_buffer("#weak_define __STDC_VERSION__ 199409L\n");
 776                         add_pre_buffer("#weak_define __STRICT_ANSI__\n");
 777                         break;
 778
 779                 case STANDARD_C99:
 780                         add_pre_buffer("#weak_define __STDC_VERSION__ 199901L\n");
 781                         add_pre_buffer("#weak_define __STRICT_ANSI__\n");
 782                         break;
 783
 784                 case STANDARD_GNU89:
 785                         break;
 786
 787                 case STANDARD_GNU99:
 788                         add_pre_buffer("#weak_define __STDC_VERSION__ 199901L\n");
 789                         break;
 790
 791                 default:
 792                         assert (0);
 793         }
 794
 795         add_pre_buffer("#define __builtin_stdarg_start(a,b) ((a) = (__builtin_va_list)(&(b)))\n");
 796         add_pre_buffer("#define __builtin_va_start(a,b) ((a) = (__builtin_va_list)(&(b)))\n");
 797         add_pre_buffer("#define __builtin_va_arg(arg,type)  ({ type __va_arg_ret = *(type *)(arg); arg += sizeof(type); __va_arg_ret; })\n");
 798         add_pre_buffer("#define __builtin_va_alist (*(void *)0)\n");
 799         add_pre_buffer("#define __builtin_va_arg_incr(x) ((x) + 1)\n");
 800         add_pre_buffer("#define __builtin_va_copy(dest, src) ({ dest = src; (void)0; })\n");
 801         add_pre_buffer("#define __builtin_va_end(arg)\n");
 802
 803         /* FIXME! We need to do these as special magic macros at expansion time! */
 804         add_pre_buffer("#define __BASE_FILE__ \"base_file.c\"\n");
 805
 806         if (optimize)
 807                 add_pre_buffer("#define __OPTIMIZE__ 1\n");
 808         if (optimize_size)
 809                 add_pre_buffer("#define __OPTIMIZE_SIZE__ 1\n");
 810
 811         /* GCC defines these for limits.h */
 812         add_pre_buffer("#weak_define __SHRT_MAX__ " STRINGIFY(__SHRT_MAX__) "\n");
 813         add_pre_buffer("#weak_define __SCHAR_MAX__ " STRINGIFY(__SCHAR_MAX__) "\n");
 814         add_pre_buffer("#weak_define __INT_MAX__ " STRINGIFY(__INT_MAX__) "\n");
 815         add_pre_buffer("#weak_define __LONG_MAX__ " STRINGIFY(__LONG_MAX__) "\n");
 816         add_pre_buffer("#weak_define __LONG_LONG_MAX__ " STRINGIFY(__LONG_LONG_MAX__) "\n");
 817         add_pre_buffer("#weak_define __WCHAR_MAX__ " STRINGIFY(__WCHAR_MAX__) "\n");
 818 }
 819
 820 static struct symbol_list *sparse_tokenstream(struct token *token)
 821 {
 822         // Preprocess the stream
 823         token = preprocess(token);
 824
 825         if (preprocess_only) {
 826                 while (!eof_token(token)) {
 827                         int prec = 1;
 828                         struct token *next = token->next;
 829                         const char *separator = "";
 830                         if (next->pos.whitespace)
 831                                 separator = " ";
 832                         if (next->pos.newline) {
 833                                 separator = "\n\t\t\t\t\t";
 834                                 prec = next->pos.pos;
 835                                 if (prec > 4)
 836                                         prec = 4;
 837                         }
 838                         printf("%s%.*s", show_token(token), prec, separator);
 839                         token = next;
 840                 }
 841                 putchar('\n');
 842
 843                 return NULL;
 844         }
 845
 846         // Parse the resulting C code
 847         while (!eof_token(token))
 848                 token = external_declaration(token, &translation_unit_used_list);
 849         return translation_unit_used_list;
 850 }
 851
 852 static struct symbol_list *sparse_file(const char *filename)
 853 {
 854         int fd;
 855         struct token *token;
 856
 857         if (strcmp (filename, "-") == 0) {
 858                 fd = 0;
 859         } else {
 860                 fd = open(filename, O_RDONLY);
 861                 if (fd < 0)
 862                         die("No such file: %s", filename);
 863         }
 864
 865         // Tokenize the input stream
 866         token = tokenize(filename, fd, NULL, includepath);
 867         close(fd);
 868
 869         return sparse_tokenstream(token);
 870 }
 871
 872 /*
 873  * This handles the "-include" directive etc: we're in global
 874  * scope, and all types/macros etc will affect all the following
 875  * files.
 876  *
 877  * NOTE NOTE NOTE! "#undef" of anything in this stage will
 878  * affect all subsequent files too, i.e. we can have non-local
 879  * behaviour between files!
 880  */
 881 static struct symbol_list *sparse_initial(void)
 882 {
 883         struct token *token;
 884         int i;
 885
 886         // Prepend any "include" file to the stream.
 887         // We're in global scope, it will affect all files!
 888         token = NULL;
 889         for (i = cmdline_include_nr - 1; i >= 0; i--)
 890                 token = tokenize(cmdline_include[i].filename, cmdline_include[i].fd,
 891                                  token, includepath);
 892
 893         // Prepend the initial built-in stream
 894         if (token)
 895                 pre_buffer_end->next = token;
 896         return sparse_tokenstream(pre_buffer_begin);
 897 }
 898
 899 struct symbol_list *sparse_initialize(int argc, char **argv, struct string_list **filelist)
 900 {
 901         char **args;
 902         struct symbol_list *list;
 903
 904         // Initialize symbol stream first, so that we can add defines etc
 905         init_symbols();
 906
 907         args = argv;
 908         for (;;) {
 909                 char *arg = *++args;
 910                 if (!arg)
 911                         break;
 912
 913                 if (arg[0] == '-' && arg[1]) {
 914                         args = handle_switch(arg+1, args);
 915                         continue;
 916                 }
 917                 add_ptr_list_notag(filelist, arg);
 918         }
 919         handle_switch_W_finalize();
 920         handle_switch_v_finalize();
 921
 922         list = NULL;
 923         if (!ptr_list_empty(filelist)) {
 924                 // Initialize type system
 925                 init_ctype();
 926
 927                 create_builtin_stream();
 928                 add_pre_buffer("#define __CHECKER__ 1\n");
 929                 if (!preprocess_only)
 930                         declare_builtin_functions();
 931
 932                 list = sparse_initial();
 933
 934                 /*
 935                  * Protect the initial token allocations, since
 936                  * they need to survive all the others
 937                  */
 938                 protect_token_alloc();
 939         }
 940         return list;
 941 }
 942
 943 struct symbol_list * sparse_keep_tokens(char *filename)
 944 {
 945         struct symbol_list *res;
 946
 947         /* Clear previous symbol list */
 948         translation_unit_used_list = NULL;
 949
 950         new_file_scope();
 951         res = sparse_file(filename);
 952
 953         /* And return it */
 954         return res;
 955 }
 956
 957
 958 struct symbol_list * __sparse(char *filename)
 959 {
 960         struct symbol_list *res;
 961
 962         res = sparse_keep_tokens(filename);
 963
 964         /* Drop the tokens for this file after parsing */
 965         clear_token_alloc();
 966
 967         /* And return it */
 968         return res;
 969 }
 970
 971 struct symbol_list * sparse(char *filename)
 972 {
 973         struct symbol_list *res = __sparse(filename);
 974
 975         /* Evaluate the complete symbol list */
 976         evaluate_symbol_list(res);
 977
 978         return res;
 979 }