gcc/fortran/cpp.c

   1 /* Copyright (C) 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
   2
   3 This file is part of GCC.
   4
   5 GCC is free software; you can redistribute it and/or modify it under
   6 the terms of the GNU General Public License as published by the Free
   7 Software Foundation; either version 3, or (at your option) any later
   8 version.
   9
  10 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  11 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  13 for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with GCC; see the file COPYING3.  If not see
  17 <http://www.gnu.org/licenses/>.  */
  18
  19 #include "config.h"
  20 #include "system.h"
  21 #include "coretypes.h"
  22 #include "tm.h"
  23 #include "tree.h"
  24 #include "version.h"
  25 #include "flags.h"
  26
  27
  28 #include "options.h"
  29 #include "gfortran.h"
  30 #include "tm_p.h"               /* Target prototypes.  */
  31 #include "target.h"
  32 #include "toplev.h"
  33 #include "diagnostic.h"
  34
  35 #include "../../libcpp/internal.h"
  36 #include "cpp.h"
  37 #include "incpath.h"
  38 #include "cppbuiltin.h"
  39 #include "mkdeps.h"
  40
  41 #ifndef TARGET_CPU_CPP_BUILTINS
  42 # define TARGET_CPU_CPP_BUILTINS()
  43 #endif
  44
  45 #ifndef TARGET_OS_CPP_BUILTINS
  46 # define TARGET_OS_CPP_BUILTINS()
  47 #endif
  48
  49 #ifndef TARGET_OBJFMT_CPP_BUILTINS
  50 # define TARGET_OBJFMT_CPP_BUILTINS()
  51 #endif
  52
  53
  54 /* Holds switches parsed by gfc_cpp_handle_option (), but whose
  55    handling is deferred to gfc_cpp_init ().  */
  56 typedef struct
  57 {
  58     enum opt_code code;
  59     const char *arg;
  60 }
  61 gfc_cpp_deferred_opt_t;
  62
  63
  64 /* Defined and undefined macros being queued for output with -dU at
  65    the next newline.  */
  66 typedef struct gfc_cpp_macro_queue
  67 {
  68   struct gfc_cpp_macro_queue *next;     /* Next macro in the list.  */
  69   char *macro;                          /* The name of the macro if not
  70                                            defined, the full definition if
  71                                            defined.  */
  72 } gfc_cpp_macro_queue;
  73 static gfc_cpp_macro_queue *cpp_define_queue, *cpp_undefine_queue;
  74
  75 struct gfc_cpp_option_data
  76 {
  77   /* Argument of -cpp, implied by SPEC;
  78      if NULL, preprocessing disabled.  */
  79   const char *temporary_filename;
  80
  81   const char *output_filename;          /* -o <arg>  */
  82   int preprocess_only;                  /* -E  */
  83   int discard_comments;                 /* -C  */
  84   int discard_comments_in_macro_exp;    /* -CC  */
  85   int print_include_names;              /* -H  */
  86   int no_line_commands;                 /* -P  */
  87   char dump_macros;                     /* -d[DMNU]  */
  88   int dump_includes;                    /* -dI  */
  89   int working_directory;                /* -fworking-directory  */
  90   int no_predefined;                    /* -undef */
  91   int standard_include_paths;           /* -nostdinc */
  92   int verbose;                          /* -v */
  93   int deps;                             /* -M */
  94   int deps_skip_system;                 /* -MM */
  95   const char *deps_filename;            /* -M[M]D */
  96   const char *deps_filename_user;       /* -MF <arg> */
  97   int deps_missing_are_generated;       /* -MG */
  98   int deps_phony;                       /* -MP */
  99
 100   const char *multilib;                 /* -imultilib <dir>  */
 101   const char *prefix;                   /* -iprefix <dir>  */
 102   const char *sysroot;                  /* -isysroot <dir>  */
 103
 104   /* Options whose handling needs to be deferred until the
 105      appropriate cpp-objects are created:
 106       -A predicate=answer
 107       -D <macro>[=<val>]
 108       -U <macro>  */
 109   gfc_cpp_deferred_opt_t *deferred_opt;
 110   int deferred_opt_count;
 111 }
 112 gfc_cpp_option;
 113
 114 /* Structures used with libcpp:  */
 115 static cpp_options *cpp_option = NULL;
 116 static cpp_reader *cpp_in = NULL;
 117
 118 /* Encapsulates state used to convert a stream of cpp-tokens into
 119    a text file.  */
 120 static struct
 121 {
 122   FILE *outf;                   /* Stream to write to.  */
 123   const cpp_token *prev;        /* Previous token.  */
 124   const cpp_token *source;      /* Source token for spacing.  */
 125   int src_line;                 /* Line number currently being written.  */
 126   unsigned char printed;        /* Nonzero if something output at line.  */
 127   bool first_time;              /* cb_file_change hasn't been called yet.  */
 128 } print;
 129
 130 /* General output routines.  */
 131 static void scan_translation_unit (cpp_reader *);
 132 static void scan_translation_unit_trad (cpp_reader *);
 133
 134 /* Callback routines for the parser. Most of these are active only
 135    in specific modes.  */
 136 static void cb_file_change (cpp_reader *, const struct line_map *);
 137 static void cb_line_change (cpp_reader *, const cpp_token *, int);
 138 static void cb_define (cpp_reader *, source_location, cpp_hashnode *);
 139 static void cb_undef (cpp_reader *, source_location, cpp_hashnode *);
 140 static void cb_def_pragma (cpp_reader *, source_location);
 141 static void cb_include (cpp_reader *, source_location, const unsigned char *,
 142                         const char *, int, const cpp_token **);
 143 static void cb_ident (cpp_reader *, source_location, const cpp_string *);
 144 static void cb_used_define (cpp_reader *, source_location, cpp_hashnode *);
 145 static void cb_used_undef (cpp_reader *, source_location, cpp_hashnode *);
 146 static bool cb_cpp_error (cpp_reader *, int, int, location_t, unsigned int,
 147                           const char *, va_list *)
 148      ATTRIBUTE_GCC_DIAG(6,0);
 149 void pp_dir_change (cpp_reader *, const char *);
 150
 151 static int dump_macro (cpp_reader *, cpp_hashnode *, void *);
 152 static void dump_queued_macros (cpp_reader *);
 153
 154
 155 static void
 156 cpp_define_builtins (cpp_reader *pfile)
 157 {
 158   /* Initialize CPP built-ins; '1' corresponds to 'flag_hosted'
 159      in C, defines __STDC_HOSTED__?!  */
 160   cpp_init_builtins (pfile, 0);
 161
 162   /* Initialize GFORTRAN specific builtins.
 163      These are documented.  */
 164   define_language_independent_builtin_macros (pfile);
 165   cpp_define (pfile, "__GFORTRAN__=1");
 166   cpp_define (pfile, "_LANGUAGE_FORTRAN=1");
 167
 168   if (gfc_option.gfc_flag_openmp)
 169     cpp_define (pfile, "_OPENMP=201107");
 170
 171   /* The defines below are necessary for the TARGET_* macros.
 172
 173      FIXME:  Note that builtin_define_std() actually is a function
 174      in c-cppbuiltin.c which uses flags undefined for Fortran.
 175      Let's skip this for now. If needed, one needs to look into it
 176      once more.  */
 177
 178 # define builtin_define(TXT) cpp_define (pfile, TXT)
 179 # define builtin_define_std(TXT)
 180 # define builtin_assert(TXT) cpp_assert (pfile, TXT)
 181
 182   /* FIXME: Pandora's Box
 183     Using the macros below results in multiple breakages:
 184      - mingw will fail to compile this file as dependent macros
 185        assume to be used in c-cppbuiltin.c only. Further, they use
 186        flags only valid/defined in C (same as noted above).
 187        [config/i386/mingw32.h, config/i386/cygming.h]
 188      - other platforms (not as popular) break similarly
 189        [grep for 'builtin_define_with_int_value' in gcc/config/]
 190
 191   TARGET_CPU_CPP_BUILTINS ();
 192   TARGET_OS_CPP_BUILTINS ();
 193   TARGET_OBJFMT_CPP_BUILTINS (); */
 194
 195 #undef builtin_define
 196 #undef builtin_define_std
 197 #undef builtin_assert
 198 }
 199
 200 bool
 201 gfc_cpp_enabled (void)
 202 {
 203   return gfc_cpp_option.temporary_filename != NULL;
 204 }
 205
 206 bool
 207 gfc_cpp_preprocess_only (void)
 208 {
 209   return gfc_cpp_option.preprocess_only;
 210 }
 211
 212 bool
 213 gfc_cpp_makedep (void)
 214 {
 215   return gfc_cpp_option.deps;
 216 }
 217
 218 void
 219 gfc_cpp_add_dep (const char *name, bool system)
 220 {
 221   if (!gfc_cpp_option.deps_skip_system || !system)
 222     deps_add_dep (cpp_get_deps (cpp_in), name);
 223 }
 224
 225 void
 226 gfc_cpp_add_target (const char *name)
 227 {
 228   deps_add_target (cpp_get_deps (cpp_in), name, 0);
 229 }
 230
 231
 232 const char *
 233 gfc_cpp_temporary_file (void)
 234 {
 235   return gfc_cpp_option.temporary_filename;
 236 }
 237
 238 void
 239 gfc_cpp_init_options (unsigned int decoded_options_count,
 240                       struct cl_decoded_option *decoded_options ATTRIBUTE_UNUSED)
 241 {
 242   /* Do not create any objects from libcpp here. If no
 243      preprocessing is requested, this would be wasted
 244      time and effort.
 245
 246      See gfc_cpp_post_options() instead.  */
 247
 248   gfc_cpp_option.temporary_filename = NULL;
 249   gfc_cpp_option.output_filename = NULL;
 250   gfc_cpp_option.preprocess_only = 0;
 251   gfc_cpp_option.discard_comments = 1;
 252   gfc_cpp_option.discard_comments_in_macro_exp = 1;
 253   gfc_cpp_option.print_include_names = 0;
 254   gfc_cpp_option.no_line_commands = 0;
 255   gfc_cpp_option.dump_macros = '\0';
 256   gfc_cpp_option.dump_includes = 0;
 257   gfc_cpp_option.working_directory = -1;
 258   gfc_cpp_option.no_predefined = 0;
 259   gfc_cpp_option.standard_include_paths = 1;
 260   gfc_cpp_option.verbose = 0;
 261   gfc_cpp_option.deps = 0;
 262   gfc_cpp_option.deps_skip_system = 0;
 263   gfc_cpp_option.deps_phony = 0;
 264   gfc_cpp_option.deps_missing_are_generated = 0;
 265   gfc_cpp_option.deps_filename = NULL;
 266   gfc_cpp_option.deps_filename_user = NULL;
 267
 268   gfc_cpp_option.multilib = NULL;
 269   gfc_cpp_option.prefix = NULL;
 270   gfc_cpp_option.sysroot = NULL;
 271
 272   gfc_cpp_option.deferred_opt = XNEWVEC (gfc_cpp_deferred_opt_t,
 273                                          decoded_options_count);
 274   gfc_cpp_option.deferred_opt_count = 0;
 275 }
 276
 277 int
 278 gfc_cpp_handle_option (size_t scode, const char *arg, int value ATTRIBUTE_UNUSED)
 279 {
 280   int result = 1;
 281   enum opt_code code = (enum opt_code) scode;
 282
 283   switch (code)
 284   {
 285     default:
 286       result = 0;
 287       break;
 288
 289     case OPT_cpp_:
 290       gfc_cpp_option.temporary_filename = arg;
 291       break;
 292
 293     case OPT_nocpp:
 294       gfc_cpp_option.temporary_filename = 0L;
 295       break;
 296
 297     case OPT_d:
 298       for ( ; *arg; ++arg)
 299         switch (*arg)
 300         {
 301           case 'D':
 302           case 'M':
 303           case 'N':
 304           case 'U':
 305             gfc_cpp_option.dump_macros = *arg;
 306             break;
 307
 308           case 'I':
 309             gfc_cpp_option.dump_includes = 1;
 310             break;
 311         }
 312       break;
 313
 314     case OPT_fworking_directory:
 315       gfc_cpp_option.working_directory = value;
 316       break;
 317
 318     case OPT_idirafter:
 319       gfc_cpp_add_include_path_after (xstrdup(arg), true);
 320       break;
 321
 322     case OPT_imultilib:
 323       gfc_cpp_option.multilib = arg;
 324       break;
 325
 326     case OPT_iprefix:
 327       gfc_cpp_option.prefix = arg;
 328       break;
 329
 330     case OPT_isysroot:
 331       gfc_cpp_option.sysroot = arg;
 332       break;
 333
 334     case OPT_iquote:
 335     case OPT_isystem:
 336       gfc_cpp_add_include_path (xstrdup(arg), true);
 337       break;
 338
 339     case OPT_nostdinc:
 340       gfc_cpp_option.standard_include_paths = value;
 341       break;
 342
 343     case OPT_o:
 344       if (!gfc_cpp_option.output_filename)
 345         gfc_cpp_option.output_filename = arg;
 346       else
 347         gfc_fatal_error ("output filename specified twice");
 348       break;
 349
 350     case OPT_undef:
 351       gfc_cpp_option.no_predefined = value;
 352       break;
 353
 354     case OPT_v:
 355       gfc_cpp_option.verbose = value;
 356       break;
 357
 358     case OPT_A:
 359     case OPT_D:
 360     case OPT_U:
 361       gfc_cpp_option.deferred_opt[gfc_cpp_option.deferred_opt_count].code = code;
 362       gfc_cpp_option.deferred_opt[gfc_cpp_option.deferred_opt_count].arg = arg;
 363       gfc_cpp_option.deferred_opt_count++;
 364       break;
 365
 366     case OPT_C:
 367       gfc_cpp_option.discard_comments = 0;
 368       break;
 369
 370     case OPT_CC:
 371       gfc_cpp_option.discard_comments = 0;
 372       gfc_cpp_option.discard_comments_in_macro_exp = 0;
 373       break;
 374
 375     case OPT_E:
 376       gfc_cpp_option.preprocess_only = 1;
 377       break;
 378
 379     case OPT_H:
 380       gfc_cpp_option.print_include_names = 1;
 381       break;
 382
 383     case OPT_MM:
 384       gfc_cpp_option.deps_skip_system = 1;
 385       /* fall through */
 386
 387     case OPT_M:
 388       gfc_cpp_option.deps = 1;
 389       break;
 390
 391     case OPT_MMD:
 392       gfc_cpp_option.deps_skip_system = 1;
 393       /* fall through */
 394
 395     case OPT_MD:
 396       gfc_cpp_option.deps = 1;
 397       gfc_cpp_option.deps_filename = arg;
 398       break;
 399
 400     case OPT_MF:
 401       /* If specified multiple times, last one wins.  */
 402       gfc_cpp_option.deps_filename_user = arg;
 403       break;
 404
 405     case OPT_MG:
 406       gfc_cpp_option.deps_missing_are_generated = 1;
 407       break;
 408
 409     case OPT_MP:
 410       gfc_cpp_option.deps_phony = 1;
 411       break;
 412
 413     case OPT_MQ:
 414     case OPT_MT:
 415       gfc_cpp_option.deferred_opt[gfc_cpp_option.deferred_opt_count].code = code;
 416       gfc_cpp_option.deferred_opt[gfc_cpp_option.deferred_opt_count].arg = arg;
 417       gfc_cpp_option.deferred_opt_count++;
 418       break;
 419
 420     case OPT_P:
 421       gfc_cpp_option.no_line_commands = 1;
 422       break;
 423   }
 424
 425   return result;
 426 }
 427
 428
 429 void
 430 gfc_cpp_post_options (void)
 431 {
 432   /* Any preprocessing-related option without '-cpp' is considered
 433      an error.  */
 434   if (!gfc_cpp_enabled ()
 435       && (gfc_cpp_preprocess_only ()
 436           || gfc_cpp_makedep ()
 437           || !gfc_cpp_option.discard_comments
 438           || !gfc_cpp_option.discard_comments_in_macro_exp
 439           || gfc_cpp_option.print_include_names
 440           || gfc_cpp_option.no_line_commands
 441           || gfc_cpp_option.dump_macros
 442           || gfc_cpp_option.dump_includes))
 443     gfc_fatal_error("To enable preprocessing, use -cpp");
 444
 445   if (!gfc_cpp_enabled ())
 446     return;
 447
 448   cpp_in = cpp_create_reader (CLK_GNUC89, NULL, line_table);
 449   gcc_assert (cpp_in);
 450
 451   /* The cpp_options-structure defines far more flags than those set here.
 452      If any other is implemented, see c-opt.c (sanitize_cpp_opts) for
 453      inter-option dependencies that may need to be enforced.  */
 454   cpp_option = cpp_get_options (cpp_in);
 455   gcc_assert (cpp_option);
 456
 457   /* TODO: allow non-traditional modes, e.g. by -cpp-std=...?  */
 458   cpp_option->traditional = 1;
 459   cpp_option->cplusplus_comments = 0;
 460
 461   cpp_option->cpp_pedantic = pedantic;
 462
 463   cpp_option->dollars_in_ident = gfc_option.flag_dollar_ok;
 464   cpp_option->discard_comments = gfc_cpp_option.discard_comments;
 465   cpp_option->discard_comments_in_macro_exp = gfc_cpp_option.discard_comments_in_macro_exp;
 466   cpp_option->print_include_names = gfc_cpp_option.print_include_names;
 467   cpp_option->preprocessed = gfc_option.flag_preprocessed;
 468
 469   if (gfc_cpp_makedep ())
 470     {
 471       cpp_option->deps.style = DEPS_USER;
 472       cpp_option->deps.phony_targets = gfc_cpp_option.deps_phony;
 473       cpp_option->deps.missing_files = gfc_cpp_option.deps_missing_are_generated;
 474
 475       /* -MF <arg> overrides -M[M]D.  */
 476       if (gfc_cpp_option.deps_filename_user)
 477         gfc_cpp_option.deps_filename = gfc_cpp_option.deps_filename_user;
 478   }
 479
 480   if (gfc_cpp_option.working_directory == -1)
 481     gfc_cpp_option.working_directory = (debug_info_level != DINFO_LEVEL_NONE);
 482
 483   cpp_post_options (cpp_in);
 484
 485   gfc_cpp_register_include_paths ();
 486 }
 487
 488
 489 void
 490 gfc_cpp_init_0 (void)
 491 {
 492   struct cpp_callbacks *cb;
 493
 494   cb = cpp_get_callbacks (cpp_in);
 495   cb->file_change = cb_file_change;
 496   cb->line_change = cb_line_change;
 497   cb->ident = cb_ident;
 498   cb->def_pragma = cb_def_pragma;
 499   cb->error = cb_cpp_error;
 500
 501   if (gfc_cpp_option.dump_includes)
 502     cb->include = cb_include;
 503
 504   if ((gfc_cpp_option.dump_macros == 'D')
 505       || (gfc_cpp_option.dump_macros == 'N'))
 506     {
 507       cb->define = cb_define;
 508       cb->undef  = cb_undef;
 509     }
 510
 511   if (gfc_cpp_option.dump_macros == 'U')
 512     {
 513       cb->before_define = dump_queued_macros;
 514       cb->used_define = cb_used_define;
 515       cb->used_undef = cb_used_undef;
 516     }
 517
 518   /* Initialize the print structure.  Setting print.src_line to -1 here is
 519      a trick to guarantee that the first token of the file will cause
 520      a linemarker to be output by maybe_print_line.  */
 521   print.src_line = -1;
 522   print.printed = 0;
 523   print.prev = 0;
 524   print.first_time = 1;
 525
 526   if (gfc_cpp_preprocess_only ())
 527     {
 528       if (gfc_cpp_option.output_filename)
 529         {
 530           /* This needs cheating: with "-E -o <file>", the user wants the
 531              preprocessed output in <file>. However, if nothing is done
 532              about it <file> is also used for assembler output. Hence, it
 533              is necessary to redirect assembler output (actually nothing
 534              as -E implies -fsyntax-only) to another file, otherwise the
 535              output from preprocessing is lost.  */
 536           asm_file_name = gfc_cpp_option.temporary_filename;
 537
 538           print.outf = fopen (gfc_cpp_option.output_filename, "w");
 539           if (print.outf == NULL)
 540             gfc_fatal_error ("opening output file %s: %s",
 541                              gfc_cpp_option.output_filename,
 542                              xstrerror (errno));
 543         }
 544       else
 545         print.outf = stdout;
 546     }
 547   else
 548     {
 549       print.outf = fopen (gfc_cpp_option.temporary_filename, "w");
 550       if (print.outf == NULL)
 551         gfc_fatal_error ("opening output file %s: %s",
 552                          gfc_cpp_option.temporary_filename, xstrerror (errno));
 553     }
 554
 555   gcc_assert(cpp_in);
 556   if (!cpp_read_main_file (cpp_in, gfc_source_file))
 557     errorcount++;
 558 }
 559
 560 void
 561 gfc_cpp_init (void)
 562 {
 563   int i;
 564
 565   if (gfc_option.flag_preprocessed)
 566     return;
 567
 568   if (!gfc_cpp_option.no_predefined)
 569     {
 570       /* Make sure all of the builtins about to be declared have
 571         BUILTINS_LOCATION has their source_location.  */
 572       source_location builtins_loc = BUILTINS_LOCATION;
 573       cpp_force_token_locations (cpp_in, &builtins_loc);
 574
 575       cpp_define_builtins (cpp_in);
 576
 577       cpp_stop_forcing_token_locations (cpp_in);
 578     }
 579
 580   /* Handle deferred options from command-line.  */
 581   cpp_change_file (cpp_in, LC_RENAME, _("<command-line>"));
 582
 583   for (i = 0; i < gfc_cpp_option.deferred_opt_count; i++)
 584     {
 585       gfc_cpp_deferred_opt_t *opt = &gfc_cpp_option.deferred_opt[i];
 586
 587       if (opt->code == OPT_D)
 588         cpp_define (cpp_in, opt->arg);
 589       else if (opt->code == OPT_U)
 590         cpp_undef (cpp_in, opt->arg);
 591       else if (opt->code == OPT_A)
 592         {
 593           if (opt->arg[0] == '-')
 594             cpp_unassert (cpp_in, opt->arg + 1);
 595           else
 596             cpp_assert (cpp_in, opt->arg);
 597         }
 598       else if (opt->code == OPT_MT || opt->code == OPT_MQ)
 599         deps_add_target (cpp_get_deps (cpp_in),
 600                          opt->arg, opt->code == OPT_MQ);
 601     }
 602
 603   if (gfc_cpp_option.working_directory
 604       && gfc_cpp_option.preprocess_only && !gfc_cpp_option.no_line_commands)
 605     pp_dir_change (cpp_in, get_src_pwd ());
 606 }
 607
 608 gfc_try
 609 gfc_cpp_preprocess (const char *source_file)
 610 {
 611   if (!gfc_cpp_enabled ())
 612     return FAILURE;
 613
 614   cpp_change_file (cpp_in, LC_RENAME, source_file);
 615
 616   if (cpp_option->traditional)
 617     scan_translation_unit_trad (cpp_in);
 618   else
 619     scan_translation_unit (cpp_in);
 620
 621   /* -dM command line option.  */
 622   if (gfc_cpp_preprocess_only () &&
 623       gfc_cpp_option.dump_macros == 'M')
 624     {
 625       putc ('\n', print.outf);
 626       cpp_forall_identifiers (cpp_in, dump_macro, NULL);
 627     }
 628
 629   putc ('\n', print.outf);
 630
 631   if (!gfc_cpp_preprocess_only ()
 632       || (gfc_cpp_preprocess_only () && gfc_cpp_option.output_filename))
 633     fclose (print.outf);
 634
 635   return SUCCESS;
 636 }
 637
 638 void
 639 gfc_cpp_done (void)
 640 {
 641   if (!gfc_cpp_enabled ())
 642     return;
 643
 644   gcc_assert (cpp_in);
 645
 646   if (gfc_cpp_makedep ())
 647     {
 648       if (gfc_cpp_option.deps_filename)
 649         {
 650           FILE *f = fopen (gfc_cpp_option.deps_filename, "w");
 651           if (f)
 652             {
 653               cpp_finish (cpp_in, f);
 654               fclose (f);
 655             }
 656           else
 657             gfc_fatal_error ("opening output file %s: %s",
 658                              gfc_cpp_option.deps_filename,
 659                              xstrerror (errno));
 660         }
 661       else
 662         cpp_finish (cpp_in, stdout);
 663     }
 664
 665   cpp_undef_all (cpp_in);
 666   cpp_clear_file_cache (cpp_in);
 667 }
 668
 669 /* PATH must be malloc-ed and NULL-terminated.  */
 670 void
 671 gfc_cpp_add_include_path (char *path, bool user_supplied)
 672 {
 673   /* CHAIN sets cpp_dir->sysp which differs from 0 if PATH is a system
 674      include path. Fortran does not define any system include paths.  */
 675   int cxx_aware = 0;
 676
 677   add_path (path, BRACKET, cxx_aware, user_supplied);
 678 }
 679
 680 void
 681 gfc_cpp_add_include_path_after (char *path, bool user_supplied)
 682 {
 683   int cxx_aware = 0;
 684   add_path (path, AFTER, cxx_aware, user_supplied);
 685 }
 686
 687 void
 688 gfc_cpp_register_include_paths (void)
 689 {
 690   int cxx_stdinc = 0;
 691   register_include_chains (cpp_in, gfc_cpp_option.sysroot,
 692                            gfc_cpp_option.prefix, gfc_cpp_option.multilib,
 693                            gfc_cpp_option.standard_include_paths, cxx_stdinc,
 694                            gfc_cpp_option.verbose);
 695 }
 696
 697
 698
 699 static void scan_translation_unit_trad (cpp_reader *);
 700 static void account_for_newlines (const unsigned char *, size_t);
 701 static int dump_macro (cpp_reader *, cpp_hashnode *, void *);
 702
 703 static void print_line (source_location, const char *);
 704 static void maybe_print_line (source_location);
 705
 706
 707 /* Writes out the preprocessed file, handling spacing and paste
 708    avoidance issues.  */
 709 static void
 710 scan_translation_unit (cpp_reader *pfile)
 711 {
 712   bool avoid_paste = false;
 713
 714   print.source = NULL;
 715   for (;;)
 716     {
 717       const cpp_token *token = cpp_get_token (pfile);
 718
 719       if (token->type == CPP_PADDING)
 720         {
 721           avoid_paste = true;
 722           if (print.source == NULL
 723               || (!(print.source->flags & PREV_WHITE)
 724                   && token->val.source == NULL))
 725             print.source = token->val.source;
 726           continue;
 727         }
 728
 729       if (token->type == CPP_EOF)
 730         break;
 731
 732       /* Subtle logic to output a space if and only if necessary.  */
 733       if (avoid_paste)
 734         {
 735           if (print.source == NULL)
 736             print.source = token;
 737           if (print.source->flags & PREV_WHITE
 738               || (print.prev
 739                   && cpp_avoid_paste (pfile, print.prev, token))
 740               || (print.prev == NULL && token->type == CPP_HASH))
 741             putc (' ', print.outf);
 742         }
 743       else if (token->flags & PREV_WHITE)
 744         putc (' ', print.outf);
 745
 746       avoid_paste = false;
 747       print.source = NULL;
 748       print.prev = token;
 749       cpp_output_token (token, print.outf);
 750
 751       if (token->type == CPP_COMMENT)
 752         account_for_newlines (token->val.str.text, token->val.str.len);
 753     }
 754 }
 755
 756 /* Adjust print.src_line for newlines embedded in output.  */
 757 static void
 758 account_for_newlines (const unsigned char *str, size_t len)
 759 {
 760   while (len--)
 761     if (*str++ == '\n')
 762       print.src_line++;
 763 }
 764
 765 /* Writes out a traditionally preprocessed file.  */
 766 static void
 767 scan_translation_unit_trad (cpp_reader *pfile)
 768 {
 769   while (_cpp_read_logical_line_trad (pfile))
 770     {
 771       size_t len = pfile->out.cur - pfile->out.base;
 772       maybe_print_line (pfile->out.first_line);
 773       fwrite (pfile->out.base, 1, len, print.outf);
 774       print.printed = 1;
 775       if (!CPP_OPTION (pfile, discard_comments))
 776         account_for_newlines (pfile->out.base, len);
 777     }
 778 }
 779
 780 /* If the token read on logical line LINE needs to be output on a
 781    different line to the current one, output the required newlines or
 782    a line marker.  */
 783 static void
 784 maybe_print_line (source_location src_loc)
 785 {
 786   const struct line_map *map = linemap_lookup (line_table, src_loc);
 787   int src_line = SOURCE_LINE (map, src_loc);
 788
 789   /* End the previous line of text.  */
 790   if (print.printed)
 791     {
 792       putc ('\n', print.outf);
 793       print.src_line++;
 794       print.printed = 0;
 795     }
 796
 797   if (src_line >= print.src_line && src_line < print.src_line + 8)
 798     {
 799       while (src_line > print.src_line)
 800         {
 801           putc ('\n', print.outf);
 802           print.src_line++;
 803         }
 804     }
 805   else
 806     print_line (src_loc, "");
 807 }
 808
 809 /* Output a line marker for logical line LINE.  Special flags are "1"
 810    or "2" indicating entering or leaving a file.  */
 811 static void
 812 print_line (source_location src_loc, const char *special_flags)
 813 {
 814   /* End any previous line of text.  */
 815   if (print.printed)
 816     putc ('\n', print.outf);
 817   print.printed = 0;
 818
 819   if (!gfc_cpp_option.no_line_commands)
 820     {
 821       expanded_location loc;
 822       size_t to_file_len;
 823       unsigned char *to_file_quoted;
 824       unsigned char *p;
 825
 826       loc = expand_location (src_loc);
 827       to_file_len = strlen (loc.file);
 828       to_file_quoted = (unsigned char *) alloca (to_file_len * 4 + 1);
 829
 830       print.src_line = loc.line;
 831
 832       /* cpp_quote_string does not nul-terminate, so we have to do it
 833          ourselves.  */
 834       p = cpp_quote_string (to_file_quoted,
 835                             (const unsigned char *) loc.file, to_file_len);
 836       *p = '\0';
 837       fprintf (print.outf, "# %u \"%s\"%s",
 838                print.src_line == 0 ? 1 : print.src_line,
 839                to_file_quoted, special_flags);
 840
 841       if (loc.sysp == 2)
 842         fputs (" 3 4", print.outf);
 843       else if (loc.sysp == 1)
 844         fputs (" 3", print.outf);
 845
 846       putc ('\n', print.outf);
 847     }
 848 }
 849
 850 static void
 851 cb_file_change (cpp_reader * ARG_UNUSED (pfile), const struct line_map *map)
 852 {
 853   const char *flags = "";
 854
 855   if (gfc_cpp_option.no_line_commands)
 856     return;
 857
 858   if (!map)
 859     return;
 860
 861       if (print.first_time)
 862         {
 863           /* Avoid printing foo.i when the main file is foo.c.  */
 864           if (!cpp_get_options (cpp_in)->preprocessed)
 865             print_line (map->start_location, flags);
 866           print.first_time = 0;
 867         }
 868       else
 869         {
 870           /* Bring current file to correct line when entering a new file.  */
 871           if (map->reason == LC_ENTER)
 872             {
 873               const struct line_map *from = INCLUDED_FROM (line_table, map);
 874               maybe_print_line (LAST_SOURCE_LINE_LOCATION (from));
 875             }
 876           if (map->reason == LC_ENTER)
 877             flags = " 1";
 878           else if (map->reason == LC_LEAVE)
 879             flags = " 2";
 880           print_line (map->start_location, flags);
 881         }
 882
 883 }
 884
 885 /* Called when a line of output is started.  TOKEN is the first token
 886    of the line, and at end of file will be CPP_EOF.  */
 887 static void
 888 cb_line_change (cpp_reader *pfile, const cpp_token *token,
 889                 int parsing_args)
 890 {
 891   source_location src_loc = token->src_loc;
 892
 893   if (token->type == CPP_EOF || parsing_args)
 894     return;
 895
 896   maybe_print_line (src_loc);
 897   print.prev = 0;
 898   print.source = 0;
 899
 900   /* Supply enough spaces to put this token in its original column,
 901      one space per column greater than 2, since scan_translation_unit
 902      will provide a space if PREV_WHITE.  Don't bother trying to
 903      reconstruct tabs; we can't get it right in general, and nothing
 904      ought to care.  Some things do care; the fault lies with them.  */
 905   if (!CPP_OPTION (pfile, traditional))
 906     {
 907       const struct line_map *map = linemap_lookup (line_table, src_loc);
 908       int spaces = SOURCE_COLUMN (map, src_loc) - 2;
 909       print.printed = 1;
 910
 911       while (-- spaces >= 0)
 912         putc (' ', print.outf);
 913     }
 914 }
 915
 916 static void
 917 cb_ident (cpp_reader *pfile ATTRIBUTE_UNUSED, source_location line,
 918           const cpp_string *str)
 919 {
 920   maybe_print_line (line);
 921   fprintf (print.outf, "#ident %s\n", str->text);
 922   print.src_line++;
 923 }
 924
 925 static void
 926 cb_define (cpp_reader *pfile ATTRIBUTE_UNUSED, source_location line,
 927            cpp_hashnode *node ATTRIBUTE_UNUSED)
 928 {
 929   maybe_print_line (line);
 930   fputs ("#define ", print.outf);
 931
 932   /* 'D' is whole definition; 'N' is name only.  */
 933   if (gfc_cpp_option.dump_macros == 'D')
 934     fputs ((const char *) cpp_macro_definition (pfile, node),
 935            print.outf);
 936   else
 937     fputs ((const char *) NODE_NAME (node), print.outf);
 938
 939   putc ('\n', print.outf);
 940   if (LOCATION_LINE (line) != 0)
 941     print.src_line++;
 942 }
 943
 944 static void
 945 cb_undef (cpp_reader *pfile ATTRIBUTE_UNUSED, source_location line,
 946           cpp_hashnode *node)
 947 {
 948   maybe_print_line (line);
 949   fprintf (print.outf, "#undef %s\n", NODE_NAME (node));
 950   print.src_line++;
 951 }
 952
 953 static void
 954 cb_include (cpp_reader *pfile ATTRIBUTE_UNUSED, source_location line,
 955             const unsigned char *dir, const char *header, int angle_brackets,
 956             const cpp_token **comments)
 957 {
 958   maybe_print_line (line);
 959   if (angle_brackets)
 960     fprintf (print.outf, "#%s <%s>", dir, header);
 961   else
 962     fprintf (print.outf, "#%s \"%s\"", dir, header);
 963
 964   if (comments != NULL)
 965     {
 966       while (*comments != NULL)
 967         {
 968           if ((*comments)->flags & PREV_WHITE)
 969             putc (' ', print.outf);
 970           cpp_output_token (*comments, print.outf);
 971           ++comments;
 972         }
 973     }
 974
 975   putc ('\n', print.outf);
 976   print.src_line++;
 977 }
 978
 979 /* Dump out the hash table.  */
 980 static int
 981 dump_macro (cpp_reader *pfile, cpp_hashnode *node, void *v ATTRIBUTE_UNUSED)
 982 {
 983   if (node->type == NT_MACRO && !(node->flags & NODE_BUILTIN))
 984     {
 985       fputs ("#define ", print.outf);
 986       fputs ((const char *) cpp_macro_definition (pfile, node),
 987              print.outf);
 988       putc ('\n', print.outf);
 989       print.src_line++;
 990     }
 991
 992   return 1;
 993 }
 994
 995 static void
 996 cb_used_define (cpp_reader *pfile, source_location line ATTRIBUTE_UNUSED,
 997                 cpp_hashnode *node)
 998 {
 999   gfc_cpp_macro_queue *q;
1000   q = XNEW (gfc_cpp_macro_queue);
1001   q->macro = xstrdup ((const char *) cpp_macro_definition (pfile, node));
1002   q->next = cpp_define_queue;
1003   cpp_define_queue = q;
1004 }
1005
1006 /* Callback from cpp_error for PFILE to print diagnostics from the
1007    preprocessor.  The diagnostic is of type LEVEL, with REASON set
1008    to the reason code if LEVEL is represents a warning, at location
1009    LOCATION, with column number possibly overridden by COLUMN_OVERRIDE
1010    if not zero; MSG is the translated message and AP the arguments.
1011    Returns true if a diagnostic was emitted, false otherwise.  */
1012
1013 static bool
1014 cb_cpp_error (cpp_reader *pfile ATTRIBUTE_UNUSED, int level, int reason,
1015               location_t location, unsigned int column_override,
1016               const char *msg, va_list *ap)
1017 {
1018   diagnostic_info diagnostic;
1019   diagnostic_t dlevel;
1020   bool save_warn_system_headers = global_dc->dc_warn_system_headers;
1021   bool ret;
1022
1023   switch (level)
1024     {
1025     case CPP_DL_WARNING_SYSHDR:
1026       global_dc->dc_warn_system_headers = 1;
1027       /* Fall through.  */
1028     case CPP_DL_WARNING:
1029       dlevel = DK_WARNING;
1030       break;
1031     case CPP_DL_PEDWARN:
1032       dlevel = DK_PEDWARN;
1033       break;
1034     case CPP_DL_ERROR:
1035       dlevel = DK_ERROR;
1036       break;
1037     case CPP_DL_ICE:
1038       dlevel = DK_ICE;
1039       break;
1040     case CPP_DL_NOTE:
1041       dlevel = DK_NOTE;
1042       break;
1043     case CPP_DL_FATAL:
1044       dlevel = DK_FATAL;
1045       break;
1046     default:
1047       gcc_unreachable ();
1048     }
1049   diagnostic_set_info_translated (&diagnostic, msg, ap,
1050                                   location, dlevel);
1051   if (column_override)
1052     diagnostic_override_column (&diagnostic, column_override);
1053   if (reason == CPP_W_WARNING_DIRECTIVE)
1054     diagnostic_override_option_index (&diagnostic, OPT_Wcpp);
1055   ret = report_diagnostic (&diagnostic);
1056   if (level == CPP_DL_WARNING_SYSHDR)
1057     global_dc->dc_warn_system_headers = save_warn_system_headers;
1058   return ret;
1059 }
1060
1061 /* Callback called when -fworking-director and -E to emit working
1062    directory in cpp output file.  */
1063
1064 void
1065 pp_dir_change (cpp_reader *pfile ATTRIBUTE_UNUSED, const char *dir)
1066 {
1067   size_t to_file_len = strlen (dir);
1068   unsigned char *to_file_quoted =
1069      (unsigned char *) alloca (to_file_len * 4 + 1);
1070   unsigned char *p;
1071
1072   /* cpp_quote_string does not nul-terminate, so we have to do it ourselves.  */
1073   p = cpp_quote_string (to_file_quoted, (const unsigned char *) dir, to_file_len);
1074   *p = '\0';
1075   fprintf (print.outf, "# 1 \"%s//\"\n", to_file_quoted);
1076 }
1077
1078 /* Copy a #pragma directive to the preprocessed output.  */
1079 static void
1080 cb_def_pragma (cpp_reader *pfile, source_location line)
1081 {
1082   maybe_print_line (line);
1083   fputs ("#pragma ", print.outf);
1084   cpp_output_line (pfile, print.outf);
1085   print.src_line++;
1086 }
1087
1088 static void
1089 cb_used_undef (cpp_reader *pfile ATTRIBUTE_UNUSED,
1090                source_location line ATTRIBUTE_UNUSED,
1091                cpp_hashnode *node)
1092 {
1093   gfc_cpp_macro_queue *q;
1094   q = XNEW (gfc_cpp_macro_queue);
1095   q->macro = xstrdup ((const char *) NODE_NAME (node));
1096   q->next = cpp_undefine_queue;
1097   cpp_undefine_queue = q;
1098 }
1099
1100 static void
1101 dump_queued_macros (cpp_reader *pfile ATTRIBUTE_UNUSED)
1102 {
1103   gfc_cpp_macro_queue *q;
1104
1105   /* End the previous line of text.  */
1106   if (print.printed)
1107     {
1108       putc ('\n', print.outf);
1109       print.src_line++;
1110       print.printed = 0;
1111     }
1112
1113   for (q = cpp_define_queue; q;)
1114     {
1115       gfc_cpp_macro_queue *oq;
1116       fputs ("#define ", print.outf);
1117       fputs (q->macro, print.outf);
1118       putc ('\n', print.outf);
1119       print.src_line++;
1120       oq = q;
1121       q = q->next;
1122       free (oq->macro);
1123       free (oq);
1124     }
1125   cpp_define_queue = NULL;
1126   for (q = cpp_undefine_queue; q;)
1127     {
1128       gfc_cpp_macro_queue *oq;
1129       fprintf (print.outf, "#undef %s\n", q->macro);
1130       print.src_line++;
1131       oq = q;
1132       q = q->next;
1133       free (oq->macro);
1134       free (oq);
1135     }
1136   cpp_undefine_queue = NULL;
1137 }