lib.c

   1 /*
   2  * 'sparse' library helper routines.
   3  *
   4  * Copyright (C) 2003 Transmeta Corp.
   5  *               2003-2004 Linus Torvalds
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a copy
   8  * of this software and associated documentation files (the "Software"), to deal
   9  * in the Software without restriction, including without limitation the rights
  10  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  11  * copies of the Software, and to permit persons to whom the Software is
  12  * furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included in
  15  * all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  20  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  22  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  23  * THE SOFTWARE.
  24  */
  25 #include <ctype.h>
  26 #include <fcntl.h>
  27 #include <stdarg.h>
  28 #include <stddef.h>
  29 #include <stdio.h>
  30 #include <stdlib.h>
  31 #include <string.h>
  32 #include <unistd.h>
  33 #include <assert.h>
  34
  35 #include <sys/types.h>
  36
  37 #include "lib.h"
  38 #include "allocate.h"
  39 #include "token.h"
  40 #include "parse.h"
  41 #include "symbol.h"
  42 #include "expression.h"
  43 #include "scope.h"
  44 #include "linearize.h"
  45 #include "target.h"
  46 #include "version.h"
  47
  48 int verbose, optimize, optimize_size, preprocessing;
  49 int die_if_error = 0;
  50
  51 #ifndef __GNUC__
  52 # define __GNUC__ 2
  53 # define __GNUC_MINOR__ 95
  54 # define __GNUC_PATCHLEVEL__ 0
  55 #endif
  56
  57 int gcc_major = __GNUC__;
  58 int gcc_minor = __GNUC_MINOR__;
  59 int gcc_patchlevel = __GNUC_PATCHLEVEL__;
  60
  61 static const char *gcc_base_dir = GCC_BASE;
  62 static const char *multiarch_dir = MULTIARCH_TRIPLET;
  63
  64 struct token *skip_to(struct token *token, int op)
  65 {
  66         while (!match_op(token, op) && !eof_token(token))
  67                 token = token->next;
  68         return token;
  69 }
  70
  71 struct token *expect(struct token *token, int op, const char *where)
  72 {
  73         if (!match_op(token, op)) {
  74                 static struct token bad_token;
  75                 if (token != &bad_token) {
  76                         bad_token.next = token;
  77                         sparse_error(token->pos, "Expected %s %s", show_special(op), where);
  78                         sparse_error(token->pos, "got %s", show_token(token));
  79                 }
  80                 if (op == ';')
  81                         return skip_to(token, op);
  82                 return &bad_token;
  83         }
  84         return token->next;
  85 }
  86
  87 unsigned int hexval(unsigned int c)
  88 {
  89         int retval = 256;
  90         switch (c) {
  91         case '0'...'9':
  92                 retval = c - '0';
  93                 break;
  94         case 'a'...'f':
  95                 retval = c - 'a' + 10;
  96                 break;
  97         case 'A'...'F':
  98                 retval = c - 'A' + 10;
  99                 break;
 100         }
 101         return retval;
 102 }
 103
 104 static void do_warn(const char *type, struct position pos, const char * fmt, va_list args)
 105 {
 106         static char buffer[512];
 107         const char *name;
 108
 109         vsprintf(buffer, fmt, args);
 110         name = stream_name(pos.stream);
 111
 112         fprintf(stderr, "%s:%d:%d: %s%s\n",
 113                 name, pos.line, pos.pos, type, buffer);
 114 }
 115
 116 static int max_warnings = 100;
 117 static int show_info = 1;
 118
 119 void info(struct position pos, const char * fmt, ...)
 120 {
 121         va_list args;
 122
 123         if (!show_info)
 124                 return;
 125         va_start(args, fmt);
 126         do_warn("", pos, fmt, args);
 127         va_end(args);
 128 }
 129
 130 static void do_error(struct position pos, const char * fmt, va_list args)
 131 {
 132         static int errors = 0;
 133         die_if_error = 1;
 134         show_info = 1;
 135         /* Shut up warnings after an error */
 136         max_warnings = 0;
 137         if (errors > 100) {
 138                 static int once = 0;
 139                 show_info = 0;
 140                 if (once)
 141                         return;
 142                 fmt = "too many errors";
 143                 once = 1;
 144         }
 145
 146         do_warn("error: ", pos, fmt, args);
 147         errors++;
 148 }
 149
 150 void warning(struct position pos, const char * fmt, ...)
 151 {
 152         va_list args;
 153
 154         if (Wsparse_error) {
 155                 va_start(args, fmt);
 156                 do_error(pos, fmt, args);
 157                 va_end(args);
 158                 return;
 159         }
 160
 161         if (!max_warnings) {
 162                 show_info = 0;
 163                 return;
 164         }
 165
 166         if (!--max_warnings) {
 167                 show_info = 0;
 168                 fmt = "too many warnings";
 169         }
 170
 171         va_start(args, fmt);
 172         do_warn("warning: ", pos, fmt, args);
 173         va_end(args);
 174 }
 175
 176 void sparse_error(struct position pos, const char * fmt, ...)
 177 {
 178         va_list args;
 179         va_start(args, fmt);
 180         do_error(pos, fmt, args);
 181         va_end(args);
 182 }
 183
 184 void expression_error(struct expression *expr, const char *fmt, ...)
 185 {
 186         va_list args;
 187         va_start(args, fmt);
 188         do_error(expr->pos, fmt, args);
 189         va_end(args);
 190         expr->ctype = &bad_ctype;
 191 }
 192
 193 void error_die(struct position pos, const char * fmt, ...)
 194 {
 195         va_list args;
 196         va_start(args, fmt);
 197         do_warn("error: ", pos, fmt, args);
 198         va_end(args);
 199         exit(1);
 200 }
 201
 202 void die(const char *fmt, ...)
 203 {
 204         va_list args;
 205         static char buffer[512];
 206
 207         va_start(args, fmt);
 208         vsnprintf(buffer, sizeof(buffer), fmt, args);
 209         va_end(args);
 210
 211         fprintf(stderr, "%s\n", buffer);
 212         exit(1);
 213 }
 214
 215 static struct token *pre_buffer_begin = NULL;
 216 static struct token *pre_buffer_end = NULL;
 217
 218 int Waddress_space = 1;
 219 int Wbitwise = 0;
 220 int Wcast_to_as = 0;
 221 int Wcast_truncate = 1;
 222 int Wcontext = 1;
 223 int Wdecl = 1;
 224 int Wdeclarationafterstatement = -1;
 225 int Wdefault_bitfield_sign = 0;
 226 int Wdesignated_init = 1;
 227 int Wdo_while = 0;
 228 int Winit_cstring = 0;
 229 int Wenum_mismatch = 1;
 230 int Wsparse_error = 0;
 231 int Wnon_pointer_null = 1;
 232 int Wold_initializer = 1;
 233 int Wone_bit_signed_bitfield = 1;
 234 int Wparen_string = 0;
 235 int Wptr_subtraction_blows = 0;
 236 int Wreturn_void = 0;
 237 int Wshadow = 0;
 238 int Wsizeof_bool = 0;
 239 int Wtautological_compare = 0;
 240 int Wtransparent_union = 0;
 241 int Wtypesign = 0;
 242 int Wundef = 0;
 243 int Wuninitialized = 1;
 244 int Wunknown_attribute = 1;
 245 int Wvla = 1;
 246
 247 int dbg_entry = 0;
 248 int dbg_dead = 0;
 249
 250 int preprocess_only;
 251
 252 static enum { STANDARD_C89,
 253               STANDARD_C94,
 254               STANDARD_C99,
 255               STANDARD_C11,
 256               STANDARD_GNU11,
 257               STANDARD_GNU89,
 258               STANDARD_GNU99, } standard = STANDARD_GNU89;
 259
 260 #define ARCH_LP32  0
 261 #define ARCH_LP64  1
 262 #define ARCH_LLP64 2
 263
 264 #ifdef __x86_64__
 265 #define ARCH_M64_DEFAULT ARCH_LP64
 266 #else
 267 #define ARCH_M64_DEFAULT ARCH_LP32
 268 #endif
 269
 270 int arch_m64 = ARCH_M64_DEFAULT;
 271 int arch_msize_long = 0;
 272
 273 #define CMDLINE_INCLUDE 20
 274 static int cmdline_include_nr = 0;
 275 static char *cmdline_include[CMDLINE_INCLUDE];
 276
 277
 278 void add_pre_buffer(const char *fmt, ...)
 279 {
 280         va_list args;
 281         unsigned int size;
 282         struct token *begin, *end;
 283         char buffer[4096];
 284
 285         va_start(args, fmt);
 286         size = vsnprintf(buffer, sizeof(buffer), fmt, args);
 287         va_end(args);
 288         begin = tokenize_buffer(buffer, size, &end);
 289         if (!pre_buffer_begin)
 290                 pre_buffer_begin = begin;
 291         if (pre_buffer_end)
 292                 pre_buffer_end->next = begin;
 293         pre_buffer_end = end;
 294 }
 295
 296 static char **handle_switch_D(char *arg, char **next)
 297 {
 298         const char *name = arg + 1;
 299         const char *value = "1";
 300
 301         if (!*name || isspace((unsigned char)*name))
 302                 die("argument to `-D' is missing");
 303
 304         for (;;) {
 305                 char c;
 306                 c = *++arg;
 307                 if (!c)
 308                         break;
 309                 if (isspace((unsigned char)c) || c == '=') {
 310                         *arg = '\0';
 311                         value = arg + 1;
 312                         break;
 313                 }
 314         }
 315         add_pre_buffer("#define %s %s\n", name, value);
 316         return next;
 317 }
 318
 319 static char **handle_switch_E(char *arg, char **next)
 320 {
 321         if (arg[1] == '\0')
 322                 preprocess_only = 1;
 323         return next;
 324 }
 325
 326 static char **handle_switch_I(char *arg, char **next)
 327 {
 328         char *path = arg+1;
 329
 330         switch (arg[1]) {
 331         case '-':
 332                 add_pre_buffer("#split_include\n");
 333                 break;
 334
 335         case '\0':      /* Plain "-I" */
 336                 path = *++next;
 337                 if (!path)
 338                         die("missing argument for -I option");
 339                 /* Fall through */
 340         default:
 341                 add_pre_buffer("#add_include \"%s/\"\n", path);
 342         }
 343         return next;
 344 }
 345
 346 static void add_cmdline_include(char *filename)
 347 {
 348         if (cmdline_include_nr >= CMDLINE_INCLUDE)
 349                 die("too many include files for %s\n", filename);
 350         cmdline_include[cmdline_include_nr++] = filename;
 351 }
 352
 353 static char **handle_switch_i(char *arg, char **next)
 354 {
 355         if (*next && !strcmp(arg, "include"))
 356                 add_cmdline_include(*++next);
 357         else if (*next && !strcmp(arg, "imacros"))
 358                 add_cmdline_include(*++next);
 359         else if (*next && !strcmp(arg, "isystem")) {
 360                 char *path = *++next;
 361                 if (!path)
 362                         die("missing argument for -isystem option");
 363                 add_pre_buffer("#add_isystem \"%s/\"\n", path);
 364         } else if (*next && !strcmp(arg, "idirafter")) {
 365                 char *path = *++next;
 366                 if (!path)
 367                         die("missing argument for -idirafter option");
 368                 add_pre_buffer("#add_dirafter \"%s/\"\n", path);
 369         }
 370         return next;
 371 }
 372
 373 static char **handle_switch_M(char *arg, char **next)
 374 {
 375         if (!strcmp(arg, "MF") || !strcmp(arg,"MQ") || !strcmp(arg,"MT")) {
 376                 if (!*next)
 377                         die("missing argument for -%s option", arg);
 378                 return next + 1;
 379         }
 380         return next;
 381 }
 382
 383 static char **handle_multiarch_dir(char *arg, char **next)
 384 {
 385         multiarch_dir = *++next;
 386         if (!multiarch_dir)
 387                 die("missing argument for -multiarch-dir option");
 388         return next;
 389 }
 390
 391 static char **handle_switch_m(char *arg, char **next)
 392 {
 393         if (!strcmp(arg, "m64")) {
 394                 arch_m64 = ARCH_LP64;
 395         } else if (!strcmp(arg, "m32")) {
 396                 arch_m64 = ARCH_LP32;
 397         } else if (!strcmp(arg, "msize-llp64")) {
 398                 arch_m64 = ARCH_LLP64;
 399         } else if (!strcmp(arg, "msize-long")) {
 400                 arch_msize_long = 1;
 401         } else if (!strcmp(arg, "multiarch-dir"))
 402                 return handle_multiarch_dir(arg, next);
 403         return next;
 404 }
 405
 406 static void handle_arch_m64_finalize(void)
 407 {
 408         switch (arch_m64) {
 409         case ARCH_LP32:
 410                 /* default values */
 411                 return;
 412         case ARCH_LP64:
 413                 bits_in_long = 64;
 414                 max_int_alignment = 8;
 415                 size_t_ctype = &ulong_ctype;
 416                 ssize_t_ctype = &long_ctype;
 417                 add_pre_buffer("#weak_define __LP64__ 1\n");
 418                 add_pre_buffer("#weak_define _LP64 1\n");
 419                 goto case_64bit_common;
 420         case ARCH_LLP64:
 421                 bits_in_long = 32;
 422                 max_int_alignment = 4;
 423                 size_t_ctype = &ullong_ctype;
 424                 ssize_t_ctype = &llong_ctype;
 425                 add_pre_buffer("#weak_define __LLP64__ 1\n");
 426                 goto case_64bit_common;
 427         case_64bit_common:
 428                 bits_in_pointer = 64;
 429                 pointer_alignment = 8;
 430 #ifdef __x86_64__
 431                 add_pre_buffer("#weak_define __x86_64__ 1\n");
 432 #endif
 433                 break;
 434         }
 435 }
 436
 437 static void handle_arch_msize_long_finalize(void)
 438 {
 439         if (arch_msize_long) {
 440                 size_t_ctype = &ulong_ctype;
 441                 ssize_t_ctype = &long_ctype;
 442         }
 443 }
 444
 445 static void handle_arch_finalize(void)
 446 {
 447         handle_arch_m64_finalize();
 448         handle_arch_msize_long_finalize();
 449 }
 450
 451
 452 static char **handle_switch_o(char *arg, char **next)
 453 {
 454         if (!strcmp (arg, "o")) {       // "-o foo"
 455                 if (!*++next)
 456                         die("argument to '-o' is missing");
 457         }
 458         // else "-ofoo"
 459
 460         return next;
 461 }
 462
 463 static const struct warning {
 464         const char *name;
 465         int *flag;
 466 } warnings[] = {
 467         { "address-space", &Waddress_space },
 468         { "bitwise", &Wbitwise },
 469         { "cast-to-as", &Wcast_to_as },
 470         { "cast-truncate", &Wcast_truncate },
 471         { "context", &Wcontext },
 472         { "decl", &Wdecl },
 473         { "declaration-after-statement", &Wdeclarationafterstatement },
 474         { "default-bitfield-sign", &Wdefault_bitfield_sign },
 475         { "designated-init", &Wdesignated_init },
 476         { "do-while", &Wdo_while },
 477         { "enum-mismatch", &Wenum_mismatch },
 478         { "sparse-error", &Wsparse_error },
 479         { "init-cstring", &Winit_cstring },
 480         { "non-pointer-null", &Wnon_pointer_null },
 481         { "old-initializer", &Wold_initializer },
 482         { "one-bit-signed-bitfield", &Wone_bit_signed_bitfield },
 483         { "paren-string", &Wparen_string },
 484         { "ptr-subtraction-blows", &Wptr_subtraction_blows },
 485         { "return-void", &Wreturn_void },
 486         { "shadow", &Wshadow },
 487         { "sizeof-bool", &Wsizeof_bool },
 488         { "tautological-compare", &Wtautological_compare },
 489         { "transparent-union", &Wtransparent_union },
 490         { "typesign", &Wtypesign },
 491         { "undef", &Wundef },
 492         { "uninitialized", &Wuninitialized },
 493         { "unknown-attribute", &Wunknown_attribute },
 494         { "vla", &Wvla },
 495 };
 496
 497 enum {
 498         WARNING_OFF,
 499         WARNING_ON,
 500         WARNING_FORCE_OFF
 501 };
 502
 503
 504 static char **handle_onoff_switch(char *arg, char **next, const struct warning warnings[], int n)
 505 {
 506         int flag = WARNING_ON;
 507         char *p = arg + 1;
 508         unsigned i;
 509
 510         if (!strcmp(p, "sparse-all")) {
 511                 for (i = 0; i < n; i++) {
 512                         if (*warnings[i].flag != WARNING_FORCE_OFF && warnings[i].flag != &Wsparse_error)
 513                                 *warnings[i].flag = WARNING_ON;
 514                 }
 515         }
 516
 517         // Prefixes "no" and "no-" mean to turn warning off.
 518         if (p[0] == 'n' && p[1] == 'o') {
 519                 p += 2;
 520                 if (p[0] == '-')
 521                         p++;
 522                 flag = WARNING_FORCE_OFF;
 523         }
 524
 525         for (i = 0; i < n; i++) {
 526                 if (!strcmp(p,warnings[i].name)) {
 527                         *warnings[i].flag = flag;
 528                         return next;
 529                 }
 530         }
 531
 532         // Unknown.
 533         return NULL;
 534 }
 535
 536 static char **handle_switch_W(char *arg, char **next)
 537 {
 538         char ** ret = handle_onoff_switch(arg, next, warnings, ARRAY_SIZE(warnings));
 539         if (ret)
 540                 return ret;
 541
 542         // Unknown.
 543         return next;
 544 }
 545
 546 static struct warning debugs[] = {
 547         { "entry", &dbg_entry},
 548         { "dead", &dbg_dead},
 549 };
 550
 551
 552 static char **handle_switch_v(char *arg, char **next)
 553 {
 554         char ** ret = handle_onoff_switch(arg, next, debugs, ARRAY_SIZE(debugs));
 555         if (ret)
 556                 return ret;
 557
 558         // Unknown.
 559         do {
 560                 verbose++;
 561         } while (*++arg == 'v');
 562         return next;
 563 }
 564
 565
 566 static void handle_onoff_switch_finalize(const struct warning warnings[], int n)
 567 {
 568         unsigned i;
 569
 570         for (i = 0; i < n; i++) {
 571                 if (*warnings[i].flag == WARNING_FORCE_OFF)
 572                         *warnings[i].flag = WARNING_OFF;
 573         }
 574 }
 575
 576 static void handle_switch_W_finalize(void)
 577 {
 578         handle_onoff_switch_finalize(warnings, ARRAY_SIZE(warnings));
 579
 580         /* default Wdeclarationafterstatement based on the C dialect */
 581         if (-1 == Wdeclarationafterstatement)
 582         {
 583                 switch (standard)
 584                 {
 585                         case STANDARD_C89:
 586                         case STANDARD_C94:
 587                                 Wdeclarationafterstatement = 1;
 588                                 break;
 589
 590                         case STANDARD_C99:
 591                         case STANDARD_GNU89:
 592                         case STANDARD_GNU99:
 593                         case STANDARD_C11:
 594                         case STANDARD_GNU11:
 595                                 Wdeclarationafterstatement = 0;
 596                                 break;
 597
 598                         default:
 599                                 assert (0);
 600                 }
 601
 602         }
 603 }
 604
 605 static void handle_switch_v_finalize(void)
 606 {
 607         handle_onoff_switch_finalize(debugs, ARRAY_SIZE(debugs));
 608 }
 609
 610 static char **handle_switch_U(char *arg, char **next)
 611 {
 612         const char *name = arg + 1;
 613         add_pre_buffer ("#undef %s\n", name);
 614         return next;
 615 }
 616
 617 static char **handle_switch_O(char *arg, char **next)
 618 {
 619         int level = 1;
 620         if (arg[1] >= '0' && arg[1] <= '9')
 621                 level = arg[1] - '0';
 622         optimize = level;
 623         optimize_size = arg[1] == 's';
 624         return next;
 625 }
 626
 627 static char **handle_switch_ftabstop(char *arg, char **next)
 628 {
 629         char *end;
 630         unsigned long val;
 631
 632         if (*arg == '\0')
 633                 die("error: missing argument to \"-ftabstop=\"");
 634
 635         /* we silently ignore silly values */
 636         val = strtoul(arg, &end, 10);
 637         if (*end == '\0' && 1 <= val && val <= 100)
 638                 tabstop = val;
 639
 640         return next;
 641 }
 642
 643 static char **handle_switch_f(char *arg, char **next)
 644 {
 645         arg++;
 646
 647         if (!strncmp(arg, "tabstop=", 8))
 648                 return handle_switch_ftabstop(arg+8, next);
 649
 650         /* handle switches w/ arguments above, boolean and only boolean below */
 651
 652         if (!strncmp(arg, "no-", 3)) {
 653                 arg += 3;
 654         }
 655         /* handle switch here.. */
 656         return next;
 657 }
 658
 659 static char **handle_switch_G(char *arg, char **next)
 660 {
 661         if (!strcmp (arg, "G") && *next)
 662                 return next + 1; // "-G 0"
 663         else
 664                 return next;     // "-G0" or (bogus) terminal "-G"
 665 }
 666
 667 static char **handle_switch_a(char *arg, char **next)
 668 {
 669         if (!strcmp (arg, "ansi"))
 670                 standard = STANDARD_C89;
 671
 672         return next;
 673 }
 674
 675 static char **handle_switch_s(char *arg, char **next)
 676 {
 677         if (!strncmp (arg, "std=", 4))
 678         {
 679                 arg += 4;
 680
 681                 if (!strcmp (arg, "c89") ||
 682                     !strcmp (arg, "iso9899:1990"))
 683                         standard = STANDARD_C89;
 684
 685                 else if (!strcmp (arg, "iso9899:199409"))
 686                         standard = STANDARD_C94;
 687
 688                 else if (!strcmp (arg, "c99") ||
 689                          !strcmp (arg, "c9x") ||
 690                          !strcmp (arg, "iso9899:1999") ||
 691                          !strcmp (arg, "iso9899:199x"))
 692                         standard = STANDARD_C99;
 693
 694                 else if (!strcmp (arg, "gnu89"))
 695                         standard = STANDARD_GNU89;
 696
 697                 else if (!strcmp (arg, "gnu99") || !strcmp (arg, "gnu9x"))
 698                         standard = STANDARD_GNU99;
 699
 700                 else if (!strcmp(arg, "c11") ||
 701                          !strcmp(arg, "c1x") ||
 702                          !strcmp(arg, "iso9899:2011"))
 703                         standard = STANDARD_C11;
 704
 705                 else if (!strcmp(arg, "gnu11"))
 706                         standard = STANDARD_GNU11;
 707
 708                 else
 709                         die ("Unsupported C dialect");
 710         }
 711
 712         return next;
 713 }
 714
 715 static char **handle_nostdinc(char *arg, char **next)
 716 {
 717         add_pre_buffer("#nostdinc\n");
 718         return next;
 719 }
 720
 721 static char **handle_switch_n(char *arg, char **next)
 722 {
 723         if (!strcmp (arg, "nostdinc"))
 724                 return handle_nostdinc(arg, next);
 725
 726         return next;
 727 }
 728
 729 static char **handle_base_dir(char *arg, char **next)
 730 {
 731         gcc_base_dir = *++next;
 732         if (!gcc_base_dir)
 733                 die("missing argument for -gcc-base-dir option");
 734         return next;
 735 }
 736
 737 static char **handle_switch_g(char *arg, char **next)
 738 {
 739         if (!strcmp (arg, "gcc-base-dir"))
 740                 return handle_base_dir(arg, next);
 741
 742         return next;
 743 }
 744
 745
 746 static char **handle_version(char *arg, char **next)
 747 {
 748         printf("%s\n", SPARSE_VERSION);
 749         exit(0);
 750 }
 751
 752 static char **handle_param(char *arg, char **next)
 753 {
 754         char *value = NULL;
 755
 756         /* For now just skip any '--param=*' or '--param *' */
 757         if (*arg == '\0') {
 758                 value = *++next;
 759         } else if (isspace((unsigned char)*arg) || *arg == '=') {
 760                 value = ++arg;
 761         }
 762
 763         if (!value)
 764                 die("missing argument for --param option");
 765
 766         return next;
 767 }
 768
 769 struct switches {
 770         const char *name;
 771         char **(*fn)(char *, char **);
 772         unsigned int prefix:1;
 773 };
 774
 775 static char **handle_long_options(char *arg, char **next)
 776 {
 777         static struct switches cmd[] = {
 778                 { "param", handle_param, 1 },
 779                 { "version", handle_version },
 780                 { NULL, NULL }
 781         };
 782         struct switches *s = cmd;
 783
 784         while (s->name) {
 785                 int optlen = strlen(s->name);
 786                 if (!strncmp(s->name, arg, optlen + !s->prefix))
 787                         return s->fn(arg + optlen, next);
 788                 s++;
 789         }
 790         return next;
 791 }
 792
 793 static char **handle_switch(char *arg, char **next)
 794 {
 795         switch (*arg) {
 796         case 'a': return handle_switch_a(arg, next);
 797         case 'D': return handle_switch_D(arg, next);
 798         case 'E': return handle_switch_E(arg, next);
 799         case 'f': return handle_switch_f(arg, next);
 800         case 'g': return handle_switch_g(arg, next);
 801         case 'G': return handle_switch_G(arg, next);
 802         case 'I': return handle_switch_I(arg, next);
 803         case 'i': return handle_switch_i(arg, next);
 804         case 'M': return handle_switch_M(arg, next);
 805         case 'm': return handle_switch_m(arg, next);
 806         case 'n': return handle_switch_n(arg, next);
 807         case 'o': return handle_switch_o(arg, next);
 808         case 'O': return handle_switch_O(arg, next);
 809         case 's': return handle_switch_s(arg, next);
 810         case 'U': return handle_switch_U(arg, next);
 811         case 'v': return handle_switch_v(arg, next);
 812         case 'W': return handle_switch_W(arg, next);
 813         case '-': return handle_long_options(arg + 1, next);
 814         default:
 815                 break;
 816         }
 817
 818         /*
 819          * Ignore unknown command line options:
 820          * they're probably gcc switches
 821          */
 822         return next;
 823 }
 824
 825 static void predefined_macros(void)
 826 {
 827         unsigned long long val;
 828
 829         add_pre_buffer("#define __CHECKER__ 1\n");
 830
 831         val = (1ULL << (bits_in_long-1)) - 1;
 832         add_pre_buffer("#weak_define __LONG_MAX__ %#llxLL\n", val);
 833         add_pre_buffer("#weak_define __SIZEOF_POINTER__ %d\n", bits_in_pointer/8);
 834 }
 835
 836 void declare_builtin_functions(void)
 837 {
 838         /* Gaah. gcc knows tons of builtin <string.h> functions */
 839         add_pre_buffer("extern void *__builtin_memcpy(void *, const void *, __SIZE_TYPE__);\n");
 840         add_pre_buffer("extern void *__builtin_mempcpy(void *, const void *, __SIZE_TYPE__);\n");
 841         add_pre_buffer("extern void *__builtin_memset(void *, int, __SIZE_TYPE__);\n");
 842         add_pre_buffer("extern int __builtin_memcmp(const void *, const void *, __SIZE_TYPE__);\n");
 843         add_pre_buffer("extern char *__builtin_strcat(char *, const char *);\n");
 844         add_pre_buffer("extern char *__builtin_strncat(char *, const char *, __SIZE_TYPE__);\n");
 845         add_pre_buffer("extern int __builtin_strcmp(const char *, const char *);\n");
 846         add_pre_buffer("extern char *__builtin_strchr(const char *, int);\n");
 847         add_pre_buffer("extern char *__builtin_strcpy(char *, const char *);\n");
 848         add_pre_buffer("extern char *__builtin_strncpy(char *, const char *, __SIZE_TYPE__);\n");
 849         add_pre_buffer("extern __SIZE_TYPE__ __builtin_strspn(const char *, const char *);\n");
 850         add_pre_buffer("extern __SIZE_TYPE__ __builtin_strcspn(const char *, const char *);\n");
 851         add_pre_buffer("extern char * __builtin_strpbrk(const char *, const char *);\n");
 852         add_pre_buffer("extern char* __builtin_stpcpy(const char *, const char*);\n");
 853         add_pre_buffer("extern __SIZE_TYPE__ __builtin_strlen(const char *);\n");
 854
 855         /* And bitwise operations.. */
 856         add_pre_buffer("extern int __builtin_clz(int);\n");
 857         add_pre_buffer("extern int __builtin_clzl(long);\n");
 858         add_pre_buffer("extern int __builtin_clzll(long long);\n");
 859         add_pre_buffer("extern int __builtin_ctz(int);\n");
 860         add_pre_buffer("extern int __builtin_ctzl(long);\n");
 861         add_pre_buffer("extern int __builtin_ctzll(long long);\n");
 862         add_pre_buffer("extern int __builtin_ffs(int);\n");
 863         add_pre_buffer("extern int __builtin_ffsl(long);\n");
 864         add_pre_buffer("extern int __builtin_ffsll(long long);\n");
 865         add_pre_buffer("extern int __builtin_popcount(unsigned int);\n");
 866         add_pre_buffer("extern int __builtin_popcountl(unsigned long);\n");
 867         add_pre_buffer("extern int __builtin_popcountll(unsigned long long);\n");
 868
 869         /* And byte swaps.. */
 870         add_pre_buffer("extern unsigned short __builtin_bswap16(unsigned short);\n");
 871         add_pre_buffer("extern unsigned int __builtin_bswap32(unsigned int);\n");
 872         add_pre_buffer("extern unsigned long long __builtin_bswap64(unsigned long long);\n");
 873
 874         /* And atomic memory access functions.. */
 875         add_pre_buffer("extern int __sync_fetch_and_add(void *, ...);\n");
 876         add_pre_buffer("extern int __sync_fetch_and_sub(void *, ...);\n");
 877         add_pre_buffer("extern int __sync_fetch_and_or(void *, ...);\n");
 878         add_pre_buffer("extern int __sync_fetch_and_and(void *, ...);\n");
 879         add_pre_buffer("extern int __sync_fetch_and_xor(void *, ...);\n");
 880         add_pre_buffer("extern int __sync_fetch_and_nand(void *, ...);\n");
 881         add_pre_buffer("extern int __sync_add_and_fetch(void *, ...);\n");
 882         add_pre_buffer("extern int __sync_sub_and_fetch(void *, ...);\n");
 883         add_pre_buffer("extern int __sync_or_and_fetch(void *, ...);\n");
 884         add_pre_buffer("extern int __sync_and_and_fetch(void *, ...);\n");
 885         add_pre_buffer("extern int __sync_xor_and_fetch(void *, ...);\n");
 886         add_pre_buffer("extern int __sync_nand_and_fetch(void *, ...);\n");
 887         add_pre_buffer("extern int __sync_bool_compare_and_swap(void *, ...);\n");
 888         add_pre_buffer("extern int __sync_val_compare_and_swap(void *, ...);\n");
 889         add_pre_buffer("extern void __sync_synchronize();\n");
 890         add_pre_buffer("extern int __sync_lock_test_and_set(void *, ...);\n");
 891         add_pre_buffer("extern void __sync_lock_release(void *, ...);\n");
 892
 893         /* And some random ones.. */
 894         add_pre_buffer("extern void *__builtin_return_address(unsigned int);\n");
 895         add_pre_buffer("extern void *__builtin_extract_return_addr(void *);\n");
 896         add_pre_buffer("extern void *__builtin_frame_address(unsigned int);\n");
 897         add_pre_buffer("extern void __builtin_trap(void);\n");
 898         add_pre_buffer("extern void *__builtin_alloca(__SIZE_TYPE__);\n");
 899         add_pre_buffer("extern void __builtin_prefetch (const void *, ...);\n");
 900         add_pre_buffer("extern long __builtin_alpha_extbl(long, long);\n");
 901         add_pre_buffer("extern long __builtin_alpha_extwl(long, long);\n");
 902         add_pre_buffer("extern long __builtin_alpha_insbl(long, long);\n");
 903         add_pre_buffer("extern long __builtin_alpha_inswl(long, long);\n");
 904         add_pre_buffer("extern long __builtin_alpha_insql(long, long);\n");
 905         add_pre_buffer("extern long __builtin_alpha_inslh(long, long);\n");
 906         add_pre_buffer("extern long __builtin_alpha_cmpbge(long, long);\n");
 907         add_pre_buffer("extern long __builtin_labs(long);\n");
 908         add_pre_buffer("extern double __builtin_fabs(double);\n");
 909         add_pre_buffer("extern __SIZE_TYPE__ __builtin_va_arg_pack_len(void);\n");
 910
 911         /* Add Blackfin-specific stuff */
 912         add_pre_buffer(
 913                 "#ifdef __bfin__\n"
 914                 "extern void __builtin_bfin_csync(void);\n"
 915                 "extern void __builtin_bfin_ssync(void);\n"
 916                 "extern int __builtin_bfin_norm_fr1x32(int);\n"
 917                 "#endif\n"
 918         );
 919
 920         /* And some floating point stuff.. */
 921         add_pre_buffer("extern int __builtin_isgreater(float, float);\n");
 922         add_pre_buffer("extern int __builtin_isgreaterequal(float, float);\n");
 923         add_pre_buffer("extern int __builtin_isless(float, float);\n");
 924         add_pre_buffer("extern int __builtin_islessequal(float, float);\n");
 925         add_pre_buffer("extern int __builtin_islessgreater(float, float);\n");
 926         add_pre_buffer("extern int __builtin_isunordered(float, float);\n");
 927
 928         /* And some INFINITY / NAN stuff.. */
 929         add_pre_buffer("extern double __builtin_huge_val(void);\n");
 930         add_pre_buffer("extern float __builtin_huge_valf(void);\n");
 931         add_pre_buffer("extern long double __builtin_huge_vall(void);\n");
 932         add_pre_buffer("extern double __builtin_inf(void);\n");
 933         add_pre_buffer("extern float __builtin_inff(void);\n");
 934         add_pre_buffer("extern long double __builtin_infl(void);\n");
 935         add_pre_buffer("extern double __builtin_nan(const char *);\n");
 936         add_pre_buffer("extern float __builtin_nanf(const char *);\n");
 937         add_pre_buffer("extern long double __builtin_nanl(const char *);\n");
 938
 939         /* And some __FORTIFY_SOURCE ones.. */
 940         add_pre_buffer ("extern __SIZE_TYPE__ __builtin_object_size(const void *, int);\n");
 941         add_pre_buffer ("extern void * __builtin___memcpy_chk(void *, const void *, __SIZE_TYPE__, __SIZE_TYPE__);\n");
 942         add_pre_buffer ("extern void * __builtin___memmove_chk(void *, const void *, __SIZE_TYPE__, __SIZE_TYPE__);\n");
 943         add_pre_buffer ("extern void * __builtin___mempcpy_chk(void *, const void *, __SIZE_TYPE__, __SIZE_TYPE__);\n");
 944         add_pre_buffer ("extern void * __builtin___memset_chk(void *, int, __SIZE_TYPE__, __SIZE_TYPE__);\n");
 945         add_pre_buffer ("extern int __builtin___sprintf_chk(char *, int, __SIZE_TYPE__, const char *, ...);\n");
 946         add_pre_buffer ("extern int __builtin___snprintf_chk(char *, __SIZE_TYPE__, int , __SIZE_TYPE__, const char *, ...);\n");
 947         add_pre_buffer ("extern char * __builtin___stpcpy_chk(char *, const char *, __SIZE_TYPE__);\n");
 948         add_pre_buffer ("extern char * __builtin___strcat_chk(char *, const char *, __SIZE_TYPE__);\n");
 949         add_pre_buffer ("extern char * __builtin___strcpy_chk(char *, const char *, __SIZE_TYPE__);\n");
 950         add_pre_buffer ("extern char * __builtin___strncat_chk(char *, const char *, __SIZE_TYPE__, __SIZE_TYPE__);\n");
 951         add_pre_buffer ("extern char * __builtin___strncpy_chk(char *, const char *, __SIZE_TYPE__, __SIZE_TYPE__);\n");
 952         add_pre_buffer ("extern int __builtin___vsprintf_chk(char *, int, __SIZE_TYPE__, const char *, __builtin_va_list);\n");
 953         add_pre_buffer ("extern int __builtin___vsnprintf_chk(char *, __SIZE_TYPE__, int, __SIZE_TYPE__, const char *, __builtin_va_list ap);\n");
 954         add_pre_buffer ("extern void __builtin_unreachable(void);\n");
 955 }
 956
 957 void create_builtin_stream(void)
 958 {
 959         add_pre_buffer("#weak_define __GNUC__ %d\n", gcc_major);
 960         add_pre_buffer("#weak_define __GNUC_MINOR__ %d\n", gcc_minor);
 961         add_pre_buffer("#weak_define __GNUC_PATCHLEVEL__ %d\n", gcc_patchlevel);
 962
 963         /* add the multiarch include directories, if any */
 964         if (multiarch_dir && *multiarch_dir) {
 965                 add_pre_buffer("#add_system \"/usr/include/%s\"\n", multiarch_dir);
 966                 add_pre_buffer("#add_system \"/usr/local/include/%s\"\n", multiarch_dir);
 967         }
 968
 969         /* We add compiler headers path here because we have to parse
 970          * the arguments to get it, falling back to default. */
 971         add_pre_buffer("#add_system \"%s/include\"\n", gcc_base_dir);
 972         add_pre_buffer("#add_system \"%s/include-fixed\"\n", gcc_base_dir);
 973
 974         add_pre_buffer("#define __extension__\n");
 975         add_pre_buffer("#define __pragma__\n");
 976
 977         // gcc defines __SIZE_TYPE__ to be size_t.  For linux/i86 and
 978         // solaris/sparc that is really "unsigned int" and for linux/x86_64
 979         // it is "long unsigned int".  In either case we can probably
 980         // get away with this.  We need the #weak_define as cgcc will define
 981         // the right __SIZE_TYPE__.
 982         if (size_t_ctype == &ulong_ctype)
 983                 add_pre_buffer("#weak_define __SIZE_TYPE__ long unsigned int\n");
 984         else
 985                 add_pre_buffer("#weak_define __SIZE_TYPE__ unsigned int\n");
 986         add_pre_buffer("#weak_define __STDC__ 1\n");
 987
 988         switch (standard)
 989         {
 990                 case STANDARD_C89:
 991                         add_pre_buffer("#weak_define __STRICT_ANSI__\n");
 992                         break;
 993
 994                 case STANDARD_C94:
 995                         add_pre_buffer("#weak_define __STDC_VERSION__ 199409L\n");
 996                         add_pre_buffer("#weak_define __STRICT_ANSI__\n");
 997                         break;
 998
 999                 case STANDARD_C99:
1000                         add_pre_buffer("#weak_define __STDC_VERSION__ 199901L\n");
1001                         add_pre_buffer("#weak_define __STRICT_ANSI__\n");
1002                         break;
1003
1004                 case STANDARD_GNU89:
1005                         break;
1006
1007                 case STANDARD_GNU99:
1008                         add_pre_buffer("#weak_define __STDC_VERSION__ 199901L\n");
1009                         break;
1010
1011                 case STANDARD_C11:
1012                         add_pre_buffer("#weak_define __STRICT_ANSI__ 1\n");
1013                 case STANDARD_GNU11:
1014                         add_pre_buffer("#weak_define __STDC_NO_ATOMICS__ 1\n");
1015                         add_pre_buffer("#weak_define __STDC_NO_COMPLEX__ 1\n");
1016                         add_pre_buffer("#weak_define __STDC_NO_THREADS__ 1\n");
1017                         add_pre_buffer("#weak_define __STDC_VERSION__ 201112L\n");
1018                         break;
1019
1020                 default:
1021                         assert (0);
1022         }
1023
1024         add_pre_buffer("#define __builtin_stdarg_start(a,b) ((a) = (__builtin_va_list)(&(b)))\n");
1025         add_pre_buffer("#define __builtin_va_start(a,b) ((a) = (__builtin_va_list)(&(b)))\n");
1026         add_pre_buffer("#define __builtin_ms_va_start(a,b) ((a) = (__builtin_ms_va_list)(&(b)))\n");
1027         add_pre_buffer("#define __builtin_va_arg(arg,type)  ({ type __va_arg_ret = *(type *)(arg); arg += sizeof(type); __va_arg_ret; })\n");
1028         add_pre_buffer("#define __builtin_va_alist (*(void *)0)\n");
1029         add_pre_buffer("#define __builtin_va_arg_incr(x) ((x) + 1)\n");
1030         add_pre_buffer("#define __builtin_va_copy(dest, src) ({ dest = src; (void)0; })\n");
1031         add_pre_buffer("#define __builtin_ms_va_copy(dest, src) ({ dest = src; (void)0; })\n");
1032         add_pre_buffer("#define __builtin_va_end(arg)\n");
1033         add_pre_buffer("#define __builtin_ms_va_end(arg)\n");
1034         add_pre_buffer("#define __builtin_va_arg_pack()\n");
1035
1036         /* FIXME! We need to do these as special magic macros at expansion time! */
1037         add_pre_buffer("#define __BASE_FILE__ \"base_file.c\"\n");
1038
1039         if (optimize)
1040                 add_pre_buffer("#define __OPTIMIZE__ 1\n");
1041         if (optimize_size)
1042                 add_pre_buffer("#define __OPTIMIZE_SIZE__ 1\n");
1043
1044         /* GCC defines these for limits.h */
1045         add_pre_buffer("#weak_define __SHRT_MAX__ " STRINGIFY(__SHRT_MAX__) "\n");
1046         add_pre_buffer("#weak_define __SCHAR_MAX__ " STRINGIFY(__SCHAR_MAX__) "\n");
1047         add_pre_buffer("#weak_define __INT_MAX__ " STRINGIFY(__INT_MAX__) "\n");
1048         add_pre_buffer("#weak_define __LONG_MAX__ " STRINGIFY(__LONG_MAX__) "\n");
1049         add_pre_buffer("#weak_define __LONG_LONG_MAX__ " STRINGIFY(__LONG_LONG_MAX__) "\n");
1050         add_pre_buffer("#weak_define __WCHAR_MAX__ " STRINGIFY(__WCHAR_MAX__) "\n");
1051         add_pre_buffer("#weak_define __SIZEOF_POINTER__ " STRINGIFY(__SIZEOF_POINTER__) "\n");
1052         add_pre_buffer("#weak_define __CHAR_BIT__ " STRINGIFY(__CHAR_BIT__) "\n");
1053 }
1054
1055 static struct symbol_list *sparse_tokenstream(struct token *token)
1056 {
1057         // Preprocess the stream
1058         token = preprocess(token);
1059
1060         if (preprocess_only) {
1061                 while (!eof_token(token)) {
1062                         int prec = 1;
1063                         struct token *next = token->next;
1064                         const char *separator = "";
1065                         if (next->pos.whitespace)
1066                                 separator = " ";
1067                         if (next->pos.newline) {
1068                                 separator = "\n\t\t\t\t\t";
1069                                 prec = next->pos.pos;
1070                                 if (prec > 4)
1071                                         prec = 4;
1072                         }
1073                         printf("%s%.*s", show_token(token), prec, separator);
1074                         token = next;
1075                 }
1076                 putchar('\n');
1077
1078                 return NULL;
1079         }
1080
1081         // Parse the resulting C code
1082         while (!eof_token(token))
1083                 token = external_declaration(token, &translation_unit_used_list);
1084         return translation_unit_used_list;
1085 }
1086
1087 static struct symbol_list *sparse_file(const char *filename)
1088 {
1089         int fd;
1090         struct token *token;
1091
1092         if (strcmp (filename, "-") == 0) {
1093                 fd = 0;
1094         } else {
1095                 fd = open(filename, O_RDONLY);
1096                 if (fd < 0)
1097                         die("No such file: %s", filename);
1098         }
1099
1100         // Tokenize the input stream
1101         token = tokenize(filename, fd, NULL, includepath);
1102         close(fd);
1103
1104         return sparse_tokenstream(token);
1105 }
1106
1107 /*
1108  * This handles the "-include" directive etc: we're in global
1109  * scope, and all types/macros etc will affect all the following
1110  * files.
1111  *
1112  * NOTE NOTE NOTE! "#undef" of anything in this stage will
1113  * affect all subsequent files too, i.e. we can have non-local
1114  * behaviour between files!
1115  */
1116 static struct symbol_list *sparse_initial(void)
1117 {
1118         int i;
1119
1120         // Prepend any "include" file to the stream.
1121         // We're in global scope, it will affect all files!
1122         for (i = 0; i < cmdline_include_nr; i++)
1123                 add_pre_buffer("#argv_include \"%s\"\n", cmdline_include[i]);
1124
1125         return sparse_tokenstream(pre_buffer_begin);
1126 }
1127
1128 struct symbol_list *sparse_initialize(int argc, char **argv, struct string_list **filelist)
1129 {
1130         char **args;
1131         struct symbol_list *list;
1132
1133         // Initialize symbol stream first, so that we can add defines etc
1134         init_symbols();
1135
1136         args = argv;
1137         for (;;) {
1138                 char *arg = *++args;
1139                 if (!arg)
1140                         break;
1141
1142                 if (arg[0] == '-' && arg[1]) {
1143                         args = handle_switch(arg+1, args);
1144                         continue;
1145                 }
1146                 add_ptr_list_notag(filelist, arg);
1147         }
1148         handle_switch_W_finalize();
1149         handle_switch_v_finalize();
1150
1151         handle_arch_finalize();
1152
1153         list = NULL;
1154         if (!ptr_list_empty(filelist)) {
1155                 // Initialize type system
1156                 init_ctype();
1157
1158                 create_builtin_stream();
1159                 predefined_macros();
1160                 if (!preprocess_only)
1161                         declare_builtin_functions();
1162
1163                 list = sparse_initial();
1164
1165                 /*
1166                  * Protect the initial token allocations, since
1167                  * they need to survive all the others
1168                  */
1169                 protect_token_alloc();
1170         }
1171         return list;
1172 }
1173
1174 struct symbol_list * sparse_keep_tokens(char *filename)
1175 {
1176         struct symbol_list *res;
1177
1178         /* Clear previous symbol list */
1179         translation_unit_used_list = NULL;
1180
1181         new_file_scope();
1182         res = sparse_file(filename);
1183
1184         /* And return it */
1185         return res;
1186 }
1187
1188
1189 struct symbol_list * __sparse(char *filename)
1190 {
1191         struct symbol_list *res;
1192
1193         res = sparse_keep_tokens(filename);
1194
1195         /* Drop the tokens for this file after parsing */
1196         clear_token_alloc();
1197
1198         /* And return it */
1199         return res;
1200 }
1201
1202 struct symbol_list * sparse(char *filename)
1203 {
1204         struct symbol_list *res = __sparse(filename);
1205
1206         /* Evaluate the complete symbol list */
1207         evaluate_symbol_list(res);
1208
1209         return res;
1210 }