gcc/fortran/cpp.c

   1 /* Copyright (C) 2008-2018 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 "target.h"
  23 #include "gfortran.h"
  24 #include "diagnostic.h"
  25
  26
  27 #include "toplev.h"
  28
  29 #include "../../libcpp/internal.h"
  30 #include "cpp.h"
  31 #include "incpath.h"
  32 #include "cppbuiltin.h"
  33 #include "mkdeps.h"
  34
  35 #ifndef TARGET_SYSTEM_ROOT
  36 # define TARGET_SYSTEM_ROOT NULL
  37 #endif
  38
  39 #ifndef TARGET_CPU_CPP_BUILTINS
  40 # define TARGET_CPU_CPP_BUILTINS()
  41 #endif
  42
  43 #ifndef TARGET_OS_CPP_BUILTINS
  44 # define TARGET_OS_CPP_BUILTINS()
  45 #endif
  46
  47 #ifndef TARGET_OBJFMT_CPP_BUILTINS
  48 # define TARGET_OBJFMT_CPP_BUILTINS()
  49 #endif
  50
  51
  52 /* Holds switches parsed by gfc_cpp_handle_option (), but whose
  53    handling is deferred to gfc_cpp_init ().  */
  54 typedef struct
  55 {
  56     enum opt_code code;
  57     const char *arg;
  58 }
  59 gfc_cpp_deferred_opt_t;
  60
  61
  62 /* Defined and undefined macros being queued for output with -dU at
  63    the next newline.  */
  64 typedef struct gfc_cpp_macro_queue
  65 {
  66   struct gfc_cpp_macro_queue *next;     /* Next macro in the list.  */
  67   char *macro;                          /* The name of the macro if not
  68                                            defined, the full definition if
  69                                            defined.  */
  70 } gfc_cpp_macro_queue;
  71 static gfc_cpp_macro_queue *cpp_define_queue, *cpp_undefine_queue;
  72
  73 struct gfc_cpp_option_data
  74 {
  75   /* Argument of -cpp, implied by SPEC;
  76      if NULL, preprocessing disabled.  */
  77   const char *temporary_filename;
  78
  79   const char *output_filename;          /* -o <arg>  */
  80   int preprocess_only;                  /* -E  */
  81   int discard_comments;                 /* -C  */
  82   int discard_comments_in_macro_exp;    /* -CC  */
  83   int print_include_names;              /* -H  */
  84   int no_line_commands;                 /* -P  */
  85   char dump_macros;                     /* -d[DMNU]  */
  86   int dump_includes;                    /* -dI  */
  87   int working_directory;                /* -fworking-directory  */
  88   int no_predefined;                    /* -undef */
  89   int standard_include_paths;           /* -nostdinc */
  90   int verbose;                          /* -v */
  91   int deps;                             /* -M */
  92   int deps_skip_system;                 /* -MM */
  93   const char *deps_filename;            /* -M[M]D */
  94   const char *deps_filename_user;       /* -MF <arg> */
  95   int deps_missing_are_generated;       /* -MG */
  96   int deps_phony;                       /* -MP */
  97   int warn_date_time;                   /* -Wdate-time */
  98
  99   const char *multilib;                 /* -imultilib <dir>  */
 100   const char *prefix;                   /* -iprefix <dir>  */
 101   const char *sysroot;                  /* -isysroot <dir>  */
 102
 103   /* Options whose handling needs to be deferred until the
 104      appropriate cpp-objects are created:
 105       -A predicate=answer
 106       -D <macro>[=<val>]
 107       -U <macro>  */
 108   gfc_cpp_deferred_opt_t *deferred_opt;
 109   int deferred_opt_count;
 110 }
 111 gfc_cpp_option;
 112
 113 /* Structures used with libcpp:  */
 114 static cpp_options *cpp_option = NULL;
 115 static cpp_reader *cpp_in = NULL;
 116
 117 /* Encapsulates state used to convert a stream of cpp-tokens into
 118    a text file.  */
 119 static struct
 120 {
 121   FILE *outf;                   /* Stream to write to.  */
 122   const cpp_token *prev;        /* Previous token.  */
 123   const cpp_token *source;      /* Source token for spacing.  */
 124   int src_line;                 /* Line number currently being written.  */
 125   unsigned char printed;        /* Nonzero if something output at line.  */
 126   bool first_time;              /* cb_file_change hasn't been called yet.  */
 127 } print;
 128
 129 /* General output routines.  */
 130 static void scan_translation_unit (cpp_reader *);
 131 static void scan_translation_unit_trad (cpp_reader *);
 132
 133 /* Callback routines for the parser. Most of these are active only
 134    in specific modes.  */
 135 static void cb_file_change (cpp_reader *, const line_map_ordinary *);
 136 static void cb_line_change (cpp_reader *, const cpp_token *, int);
 137 static void cb_define (cpp_reader *, source_location, cpp_hashnode *);
 138 static void cb_undef (cpp_reader *, source_location, cpp_hashnode *);
 139 static void cb_def_pragma (cpp_reader *, source_location);
 140 static void cb_include (cpp_reader *, source_location, const unsigned char *,
 141                         const char *, int, const cpp_token **);
 142 static void cb_ident (cpp_reader *, source_location, const cpp_string *);
 143 static void cb_used_define (cpp_reader *, source_location, cpp_hashnode *);
 144 static void cb_used_undef (cpp_reader *, source_location, cpp_hashnode *);
 145 static bool cb_cpp_diagnostic (cpp_reader *, enum cpp_diagnostic_level,
 146                                enum cpp_warning_reason, rich_location *,
 147                                const char *, va_list *)
 148      ATTRIBUTE_GCC_DIAG(5,0);
 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 (flag_openacc)
 169     cpp_define (pfile, "_OPENACC=201306");
 170
 171   if (flag_openmp)
 172     cpp_define (pfile, "_OPENMP=201511");
 173
 174   /* The defines below are necessary for the TARGET_* macros.
 175
 176      FIXME:  Note that builtin_define_std() actually is a function
 177      in c-cppbuiltin.c which uses flags undefined for Fortran.
 178      Let's skip this for now. If needed, one needs to look into it
 179      once more.  */
 180
 181 # define builtin_define(TXT) cpp_define (pfile, TXT)
 182 # define builtin_define_std(TXT)
 183 # define builtin_assert(TXT) cpp_assert (pfile, TXT)
 184
 185   /* FIXME: Pandora's Box
 186     Using the macros below results in multiple breakages:
 187      - mingw will fail to compile this file as dependent macros
 188        assume to be used in c-cppbuiltin.c only. Further, they use
 189        flags only valid/defined in C (same as noted above).
 190        [config/i386/mingw32.h, config/i386/cygming.h]
 191      - other platforms (not as popular) break similarly
 192        [grep for 'builtin_define_with_int_value' in gcc/config/]
 193
 194   TARGET_CPU_CPP_BUILTINS ();
 195   TARGET_OS_CPP_BUILTINS ();
 196   TARGET_OBJFMT_CPP_BUILTINS (); */
 197
 198 #undef builtin_define
 199 #undef builtin_define_std
 200 #undef builtin_assert
 201 }
 202
 203 bool
 204 gfc_cpp_enabled (void)
 205 {
 206   return gfc_cpp_option.temporary_filename != NULL;
 207 }
 208
 209 bool
 210 gfc_cpp_preprocess_only (void)
 211 {
 212   return gfc_cpp_option.preprocess_only;
 213 }
 214
 215 bool
 216 gfc_cpp_makedep (void)
 217 {
 218   return gfc_cpp_option.deps;
 219 }
 220
 221 void
 222 gfc_cpp_add_dep (const char *name, bool system)
 223 {
 224   if (!gfc_cpp_option.deps_skip_system || !system)
 225     deps_add_dep (cpp_get_deps (cpp_in), name);
 226 }
 227
 228 void
 229 gfc_cpp_add_target (const char *name)
 230 {
 231   deps_add_target (cpp_get_deps (cpp_in), name, 0);
 232 }
 233
 234
 235 const char *
 236 gfc_cpp_temporary_file (void)
 237 {
 238   return gfc_cpp_option.temporary_filename;
 239 }
 240
 241 void
 242 gfc_cpp_init_options (unsigned int decoded_options_count,
 243                       struct cl_decoded_option *decoded_options ATTRIBUTE_UNUSED)
 244 {
 245   /* Do not create any objects from libcpp here. If no
 246      preprocessing is requested, this would be wasted
 247      time and effort.
 248
 249      See gfc_cpp_post_options() instead.  */
 250
 251   gfc_cpp_option.temporary_filename = NULL;
 252   gfc_cpp_option.output_filename = NULL;
 253   gfc_cpp_option.preprocess_only = 0;
 254   gfc_cpp_option.discard_comments = 1;
 255   gfc_cpp_option.discard_comments_in_macro_exp = 1;
 256   gfc_cpp_option.print_include_names = 0;
 257   gfc_cpp_option.no_line_commands = 0;
 258   gfc_cpp_option.dump_macros = '\0';
 259   gfc_cpp_option.dump_includes = 0;
 260   gfc_cpp_option.working_directory = -1;
 261   gfc_cpp_option.no_predefined = 0;
 262   gfc_cpp_option.standard_include_paths = 1;
 263   gfc_cpp_option.verbose = 0;
 264   gfc_cpp_option.warn_date_time = 0;
 265   gfc_cpp_option.deps = 0;
 266   gfc_cpp_option.deps_skip_system = 0;
 267   gfc_cpp_option.deps_phony = 0;
 268   gfc_cpp_option.deps_missing_are_generated = 0;
 269   gfc_cpp_option.deps_filename = NULL;
 270   gfc_cpp_option.deps_filename_user = NULL;
 271
 272   gfc_cpp_option.multilib = NULL;
 273   gfc_cpp_option.prefix = NULL;
 274   gfc_cpp_option.sysroot = TARGET_SYSTEM_ROOT;
 275
 276   gfc_cpp_option.deferred_opt = XNEWVEC (gfc_cpp_deferred_opt_t,
 277                                          decoded_options_count);
 278   gfc_cpp_option.deferred_opt_count = 0;
 279 }
 280
 281 int
 282 gfc_cpp_handle_option (size_t scode, const char *arg, int value ATTRIBUTE_UNUSED)
 283 {
 284   int result = 1;
 285   enum opt_code code = (enum opt_code) scode;
 286
 287   switch (code)
 288   {
 289     default:
 290       result = 0;
 291       break;
 292
 293     case OPT_cpp_:
 294       gfc_cpp_option.temporary_filename = arg;
 295       break;
 296
 297     case OPT_nocpp:
 298       gfc_cpp_option.temporary_filename = 0L;
 299       break;
 300
 301     case OPT_d:
 302       for ( ; *arg; ++arg)
 303         switch (*arg)
 304         {
 305           case 'D':
 306           case 'M':
 307           case 'N':
 308           case 'U':
 309             gfc_cpp_option.dump_macros = *arg;
 310             break;
 311
 312           case 'I':
 313             gfc_cpp_option.dump_includes = 1;
 314             break;
 315         }
 316       break;
 317
 318     case OPT_fworking_directory:
 319       gfc_cpp_option.working_directory = value;
 320       break;
 321
 322     case OPT_idirafter:
 323       gfc_cpp_add_include_path_after (xstrdup(arg), true);
 324       break;
 325
 326     case OPT_imultilib:
 327       gfc_cpp_option.multilib = arg;
 328       break;
 329
 330     case OPT_iprefix:
 331       gfc_cpp_option.prefix = arg;
 332       break;
 333
 334     case OPT_isysroot:
 335       gfc_cpp_option.sysroot = arg;
 336       break;
 337
 338     case OPT_iquote:
 339     case OPT_isystem:
 340       gfc_cpp_add_include_path (xstrdup(arg), true);
 341       break;
 342
 343     case OPT_nostdinc:
 344       gfc_cpp_option.standard_include_paths = value;
 345       break;
 346
 347     case OPT_o:
 348       if (!gfc_cpp_option.output_filename)
 349         gfc_cpp_option.output_filename = arg;
 350       else
 351         gfc_fatal_error ("output filename specified twice");
 352       break;
 353
 354     case OPT_undef:
 355       gfc_cpp_option.no_predefined = value;
 356       break;
 357
 358     case OPT_v:
 359       gfc_cpp_option.verbose = value;
 360       break;
 361
 362     case OPT_Wdate_time:
 363       gfc_cpp_option.warn_date_time = value;
 364       break;
 365
 366     case OPT_A:
 367     case OPT_D:
 368     case OPT_U:
 369       gfc_cpp_option.deferred_opt[gfc_cpp_option.deferred_opt_count].code = code;
 370       gfc_cpp_option.deferred_opt[gfc_cpp_option.deferred_opt_count].arg = arg;
 371       gfc_cpp_option.deferred_opt_count++;
 372       break;
 373
 374     case OPT_C:
 375       gfc_cpp_option.discard_comments = 0;
 376       break;
 377
 378     case OPT_CC:
 379       gfc_cpp_option.discard_comments = 0;
 380       gfc_cpp_option.discard_comments_in_macro_exp = 0;
 381       break;
 382
 383     case OPT_E:
 384       gfc_cpp_option.preprocess_only = 1;
 385       break;
 386
 387     case OPT_H:
 388       gfc_cpp_option.print_include_names = 1;
 389       break;
 390
 391     case OPT_MM:
 392       gfc_cpp_option.deps_skip_system = 1;
 393       /* fall through */
 394
 395     case OPT_M:
 396       gfc_cpp_option.deps = 1;
 397       break;
 398
 399     case OPT_MMD:
 400       gfc_cpp_option.deps_skip_system = 1;
 401       /* fall through */
 402
 403     case OPT_MD:
 404       gfc_cpp_option.deps = 1;
 405       gfc_cpp_option.deps_filename = arg;
 406       break;
 407
 408     case OPT_MF:
 409       /* If specified multiple times, last one wins.  */
 410       gfc_cpp_option.deps_filename_user = arg;
 411       break;
 412
 413     case OPT_MG:
 414       gfc_cpp_option.deps_missing_are_generated = 1;
 415       break;
 416
 417     case OPT_MP:
 418       gfc_cpp_option.deps_phony = 1;
 419       break;
 420
 421     case OPT_MQ:
 422     case OPT_MT:
 423       gfc_cpp_option.deferred_opt[gfc_cpp_option.deferred_opt_count].code = code;
 424       gfc_cpp_option.deferred_opt[gfc_cpp_option.deferred_opt_count].arg = arg;
 425       gfc_cpp_option.deferred_opt_count++;
 426       break;
 427
 428     case OPT_P:
 429       gfc_cpp_option.no_line_commands = 1;
 430       break;
 431   }
 432
 433   return result;
 434 }
 435
 436
 437 void
 438 gfc_cpp_post_options (void)
 439 {
 440   /* Any preprocessing-related option without '-cpp' is considered
 441      an error.  */
 442   if (!gfc_cpp_enabled ()
 443       && (gfc_cpp_preprocess_only ()
 444           || gfc_cpp_makedep ()
 445           || !gfc_cpp_option.discard_comments
 446           || !gfc_cpp_option.discard_comments_in_macro_exp
 447           || gfc_cpp_option.print_include_names
 448           || gfc_cpp_option.no_line_commands
 449           || gfc_cpp_option.dump_macros
 450           || gfc_cpp_option.dump_includes))
 451     gfc_fatal_error ("To enable preprocessing, use %<-cpp%>");
 452
 453   if (!gfc_cpp_enabled ())
 454     return;
 455
 456   cpp_in = cpp_create_reader (CLK_GNUC89, NULL, line_table);
 457   gcc_assert (cpp_in);
 458
 459   /* The cpp_options-structure defines far more flags than those set here.
 460      If any other is implemented, see c-opt.c (sanitize_cpp_opts) for
 461      inter-option dependencies that may need to be enforced.  */
 462   cpp_option = cpp_get_options (cpp_in);
 463   gcc_assert (cpp_option);
 464
 465   /* TODO: allow non-traditional modes, e.g. by -cpp-std=...?  */
 466   cpp_option->traditional = 1;
 467   cpp_option->cplusplus_comments = 0;
 468
 469   cpp_option->cpp_pedantic = pedantic;
 470
 471   cpp_option->dollars_in_ident = flag_dollar_ok;
 472   cpp_option->discard_comments = gfc_cpp_option.discard_comments;
 473   cpp_option->discard_comments_in_macro_exp = gfc_cpp_option.discard_comments_in_macro_exp;
 474   cpp_option->print_include_names = gfc_cpp_option.print_include_names;
 475   cpp_option->preprocessed = gfc_option.flag_preprocessed;
 476   cpp_option->warn_date_time = gfc_cpp_option.warn_date_time;
 477
 478   if (gfc_cpp_makedep ())
 479     {
 480       cpp_option->deps.style = DEPS_USER;
 481       cpp_option->deps.phony_targets = gfc_cpp_option.deps_phony;
 482       cpp_option->deps.missing_files = gfc_cpp_option.deps_missing_are_generated;
 483
 484       /* -MF <arg> overrides -M[M]D.  */
 485       if (gfc_cpp_option.deps_filename_user)
 486         gfc_cpp_option.deps_filename = gfc_cpp_option.deps_filename_user;
 487   }
 488
 489   if (gfc_cpp_option.working_directory == -1)
 490     gfc_cpp_option.working_directory = (debug_info_level != DINFO_LEVEL_NONE);
 491
 492   cpp_post_options (cpp_in);
 493
 494   gfc_cpp_register_include_paths ();
 495 }
 496
 497
 498 void
 499 gfc_cpp_init_0 (void)
 500 {
 501   struct cpp_callbacks *cb;
 502
 503   cb = cpp_get_callbacks (cpp_in);
 504   cb->file_change = cb_file_change;
 505   cb->line_change = cb_line_change;
 506   cb->ident = cb_ident;
 507   cb->def_pragma = cb_def_pragma;
 508   cb->diagnostic = cb_cpp_diagnostic;
 509
 510   if (gfc_cpp_option.dump_includes)
 511     cb->include = cb_include;
 512
 513   if ((gfc_cpp_option.dump_macros == 'D')
 514       || (gfc_cpp_option.dump_macros == 'N'))
 515     {
 516       cb->define = cb_define;
 517       cb->undef  = cb_undef;
 518     }
 519
 520   if (gfc_cpp_option.dump_macros == 'U')
 521     {
 522       cb->before_define = dump_queued_macros;
 523       cb->used_define = cb_used_define;
 524       cb->used_undef = cb_used_undef;
 525     }
 526
 527   /* Initialize the print structure.  Setting print.src_line to -1 here is
 528      a trick to guarantee that the first token of the file will cause
 529      a linemarker to be output by maybe_print_line.  */
 530   print.src_line = -1;
 531   print.printed = 0;
 532   print.prev = 0;
 533   print.first_time = 1;
 534
 535   if (gfc_cpp_preprocess_only ())
 536     {
 537       if (gfc_cpp_option.output_filename)
 538         {
 539           /* This needs cheating: with "-E -o <file>", the user wants the
 540              preprocessed output in <file>. However, if nothing is done
 541              about it <file> is also used for assembler output. Hence, it
 542              is necessary to redirect assembler output (actually nothing
 543              as -E implies -fsyntax-only) to another file, otherwise the
 544              output from preprocessing is lost.  */
 545           asm_file_name = gfc_cpp_option.temporary_filename;
 546
 547           print.outf = fopen (gfc_cpp_option.output_filename, "w");
 548           if (print.outf == NULL)
 549             gfc_fatal_error ("opening output file %qs: %s",
 550                              gfc_cpp_option.output_filename,
 551                              xstrerror (errno));
 552         }
 553       else
 554         print.outf = stdout;
 555     }
 556   else
 557     {
 558       print.outf = fopen (gfc_cpp_option.temporary_filename, "w");
 559       if (print.outf == NULL)
 560         gfc_fatal_error ("opening output file %qs: %s",
 561                          gfc_cpp_option.temporary_filename, xstrerror (errno));
 562     }
 563
 564   gcc_assert(cpp_in);
 565   if (!cpp_read_main_file (cpp_in, gfc_source_file))
 566     errorcount++;
 567 }
 568
 569 void
 570 gfc_cpp_init (void)
 571 {
 572   int i;
 573
 574   if (gfc_option.flag_preprocessed)
 575     return;
 576
 577   cpp_change_file (cpp_in, LC_RENAME, _("<built-in>"));
 578   if (!gfc_cpp_option.no_predefined)
 579     {
 580       /* Make sure all of the builtins about to be declared have
 581         BUILTINS_LOCATION has their source_location.  */
 582       source_location builtins_loc = BUILTINS_LOCATION;
 583       cpp_force_token_locations (cpp_in, &builtins_loc);
 584
 585       cpp_define_builtins (cpp_in);
 586
 587       cpp_stop_forcing_token_locations (cpp_in);
 588     }
 589
 590   /* Handle deferred options from command-line.  */
 591   cpp_change_file (cpp_in, LC_RENAME, _("<command-line>"));
 592
 593   for (i = 0; i < gfc_cpp_option.deferred_opt_count; i++)
 594     {
 595       gfc_cpp_deferred_opt_t *opt = &gfc_cpp_option.deferred_opt[i];
 596
 597       if (opt->code == OPT_D)
 598         cpp_define (cpp_in, opt->arg);
 599       else if (opt->code == OPT_U)
 600         cpp_undef (cpp_in, opt->arg);
 601       else if (opt->code == OPT_A)
 602         {
 603           if (opt->arg[0] == '-')
 604             cpp_unassert (cpp_in, opt->arg + 1);
 605           else
 606             cpp_assert (cpp_in, opt->arg);
 607         }
 608       else if (opt->code == OPT_MT || opt->code == OPT_MQ)
 609         deps_add_target (cpp_get_deps (cpp_in),
 610                          opt->arg, opt->code == OPT_MQ);
 611     }
 612
 613   if (gfc_cpp_option.working_directory
 614       && gfc_cpp_option.preprocess_only && !gfc_cpp_option.no_line_commands)
 615     pp_dir_change (cpp_in, get_src_pwd ());
 616 }
 617
 618 bool
 619 gfc_cpp_preprocess (const char *source_file)
 620 {
 621   if (!gfc_cpp_enabled ())
 622     return false;
 623
 624   cpp_change_file (cpp_in, LC_RENAME, source_file);
 625
 626   if (cpp_option->traditional)
 627     scan_translation_unit_trad (cpp_in);
 628   else
 629     scan_translation_unit (cpp_in);
 630
 631   /* -dM command line option.  */
 632   if (gfc_cpp_preprocess_only () &&
 633       gfc_cpp_option.dump_macros == 'M')
 634     {
 635       putc ('\n', print.outf);
 636       cpp_forall_identifiers (cpp_in, dump_macro, NULL);
 637     }
 638
 639   putc ('\n', print.outf);
 640
 641   if (!gfc_cpp_preprocess_only ()
 642       || (gfc_cpp_preprocess_only () && gfc_cpp_option.output_filename))
 643     fclose (print.outf);
 644
 645   return true;
 646 }
 647
 648 void
 649 gfc_cpp_done (void)
 650 {
 651   if (!gfc_cpp_enabled ())
 652     return;
 653
 654   gcc_assert (cpp_in);
 655
 656   if (gfc_cpp_makedep ())
 657     {
 658       if (gfc_cpp_option.deps_filename)
 659         {
 660           FILE *f = fopen (gfc_cpp_option.deps_filename, "w");
 661           if (f)
 662             {
 663               cpp_finish (cpp_in, f);
 664               fclose (f);
 665             }
 666           else
 667             gfc_fatal_error ("opening output file %qs: %s",
 668                              gfc_cpp_option.deps_filename,
 669                              xstrerror (errno));
 670         }
 671       else
 672         cpp_finish (cpp_in, stdout);
 673     }
 674
 675   cpp_undef_all (cpp_in);
 676   cpp_clear_file_cache (cpp_in);
 677 }
 678
 679 /* PATH must be malloc-ed and NULL-terminated.  */
 680 void
 681 gfc_cpp_add_include_path (char *path, bool user_supplied)
 682 {
 683   /* CHAIN sets cpp_dir->sysp which differs from 0 if PATH is a system
 684      include path. Fortran does not define any system include paths.  */
 685   int cxx_aware = 0;
 686
 687   add_path (path, INC_BRACKET, cxx_aware, user_supplied);
 688 }
 689
 690 void
 691 gfc_cpp_add_include_path_after (char *path, bool user_supplied)
 692 {
 693   int cxx_aware = 0;
 694   add_path (path, INC_AFTER, cxx_aware, user_supplied);
 695 }
 696
 697 void
 698 gfc_cpp_register_include_paths (void)
 699 {
 700   int cxx_stdinc = 0;
 701   register_include_chains (cpp_in, gfc_cpp_option.sysroot,
 702                            gfc_cpp_option.prefix, gfc_cpp_option.multilib,
 703                            gfc_cpp_option.standard_include_paths, cxx_stdinc,
 704                            gfc_cpp_option.verbose);
 705 }
 706
 707
 708
 709 static void scan_translation_unit_trad (cpp_reader *);
 710 static void account_for_newlines (const unsigned char *, size_t);
 711 static int dump_macro (cpp_reader *, cpp_hashnode *, void *);
 712
 713 static void print_line (source_location, const char *);
 714 static void maybe_print_line (source_location);
 715
 716
 717 /* Writes out the preprocessed file, handling spacing and paste
 718    avoidance issues.  */
 719 static void
 720 scan_translation_unit (cpp_reader *pfile)
 721 {
 722   bool avoid_paste = false;
 723
 724   print.source = NULL;
 725   for (;;)
 726     {
 727       const cpp_token *token = cpp_get_token (pfile);
 728
 729       if (token->type == CPP_PADDING)
 730         {
 731           avoid_paste = true;
 732           if (print.source == NULL
 733               || (!(print.source->flags & PREV_WHITE)
 734                   && token->val.source == NULL))
 735             print.source = token->val.source;
 736           continue;
 737         }
 738
 739       if (token->type == CPP_EOF)
 740         break;
 741
 742       /* Subtle logic to output a space if and only if necessary.  */
 743       if (avoid_paste)
 744         {
 745           if (print.source == NULL)
 746             print.source = token;
 747           if (print.source->flags & PREV_WHITE
 748               || (print.prev
 749                   && cpp_avoid_paste (pfile, print.prev, token))
 750               || (print.prev == NULL && token->type == CPP_HASH))
 751             putc (' ', print.outf);
 752         }
 753       else if (token->flags & PREV_WHITE)
 754         putc (' ', print.outf);
 755
 756       avoid_paste = false;
 757       print.source = NULL;
 758       print.prev = token;
 759       cpp_output_token (token, print.outf);
 760
 761       if (token->type == CPP_COMMENT)
 762         account_for_newlines (token->val.str.text, token->val.str.len);
 763     }
 764 }
 765
 766 /* Adjust print.src_line for newlines embedded in output.  */
 767 static void
 768 account_for_newlines (const unsigned char *str, size_t len)
 769 {
 770   while (len--)
 771     if (*str++ == '\n')
 772       print.src_line++;
 773 }
 774
 775 /* Writes out a traditionally preprocessed file.  */
 776 static void
 777 scan_translation_unit_trad (cpp_reader *pfile)
 778 {
 779   while (_cpp_read_logical_line_trad (pfile))
 780     {
 781       size_t len = pfile->out.cur - pfile->out.base;
 782       maybe_print_line (pfile->out.first_line);
 783       fwrite (pfile->out.base, 1, len, print.outf);
 784       print.printed = 1;
 785       if (!CPP_OPTION (pfile, discard_comments))
 786         account_for_newlines (pfile->out.base, len);
 787     }
 788 }
 789
 790 /* If the token read on logical line LINE needs to be output on a
 791    different line to the current one, output the required newlines or
 792    a line marker.  */
 793 static void
 794 maybe_print_line (source_location src_loc)
 795 {
 796   const line_map_ordinary *map
 797     = linemap_check_ordinary (linemap_lookup (line_table, src_loc));
 798   int src_line = SOURCE_LINE (map, src_loc);
 799
 800   /* End the previous line of text.  */
 801   if (print.printed)
 802     {
 803       putc ('\n', print.outf);
 804       print.src_line++;
 805       print.printed = 0;
 806     }
 807
 808   if (src_line >= print.src_line && src_line < print.src_line + 8)
 809     {
 810       while (src_line > print.src_line)
 811         {
 812           putc ('\n', print.outf);
 813           print.src_line++;
 814         }
 815     }
 816   else
 817     print_line (src_loc, "");
 818 }
 819
 820 /* Output a line marker for logical line LINE.  Special flags are "1"
 821    or "2" indicating entering or leaving a file.  */
 822 static void
 823 print_line (source_location src_loc, const char *special_flags)
 824 {
 825   /* End any previous line of text.  */
 826   if (print.printed)
 827     putc ('\n', print.outf);
 828   print.printed = 0;
 829
 830   if (!gfc_cpp_option.no_line_commands)
 831     {
 832       expanded_location loc;
 833       size_t to_file_len;
 834       unsigned char *to_file_quoted;
 835       unsigned char *p;
 836       int sysp;
 837
 838       loc = expand_location (src_loc);
 839       to_file_len = strlen (loc.file);
 840       to_file_quoted = (unsigned char *) alloca (to_file_len * 4 + 1);
 841
 842       print.src_line = loc.line;
 843
 844       /* cpp_quote_string does not nul-terminate, so we have to do it
 845          ourselves.  */
 846       p = cpp_quote_string (to_file_quoted,
 847                             (const unsigned char *) loc.file, to_file_len);
 848       *p = '\0';
 849       fprintf (print.outf, "# %u \"%s\"%s",
 850                print.src_line == 0 ? 1 : print.src_line,
 851                to_file_quoted, special_flags);
 852
 853       sysp = in_system_header_at (src_loc);
 854       if (sysp == 2)
 855         fputs (" 3 4", print.outf);
 856       else if (sysp == 1)
 857         fputs (" 3", print.outf);
 858
 859       putc ('\n', print.outf);
 860     }
 861 }
 862
 863 static void
 864 cb_file_change (cpp_reader * ARG_UNUSED (pfile), const line_map_ordinary *map)
 865 {
 866   const char *flags = "";
 867
 868   if (gfc_cpp_option.no_line_commands)
 869     return;
 870
 871   if (!map)
 872     return;
 873
 874       if (print.first_time)
 875         {
 876           /* Avoid printing foo.i when the main file is foo.c.  */
 877           if (!cpp_get_options (cpp_in)->preprocessed)
 878             print_line (map->start_location, flags);
 879           print.first_time = 0;
 880         }
 881       else
 882         {
 883           /* Bring current file to correct line when entering a new file.  */
 884           if (map->reason == LC_ENTER)
 885             maybe_print_line (linemap_included_from (map));
 886           if (map->reason == LC_ENTER)
 887             flags = " 1";
 888           else if (map->reason == LC_LEAVE)
 889             flags = " 2";
 890           print_line (map->start_location, flags);
 891         }
 892
 893 }
 894
 895 /* Called when a line of output is started.  TOKEN is the first token
 896    of the line, and at end of file will be CPP_EOF.  */
 897 static void
 898 cb_line_change (cpp_reader *pfile, const cpp_token *token,
 899                 int parsing_args)
 900 {
 901   source_location src_loc = token->src_loc;
 902
 903   if (token->type == CPP_EOF || parsing_args)
 904     return;
 905
 906   maybe_print_line (src_loc);
 907   print.prev = 0;
 908   print.source = 0;
 909
 910   /* Supply enough spaces to put this token in its original column,
 911      one space per column greater than 2, since scan_translation_unit
 912      will provide a space if PREV_WHITE.  Don't bother trying to
 913      reconstruct tabs; we can't get it right in general, and nothing
 914      ought to care.  Some things do care; the fault lies with them.  */
 915   if (!CPP_OPTION (pfile, traditional))
 916     {
 917       const line_map_ordinary *map
 918         = linemap_check_ordinary (linemap_lookup (line_table, src_loc));
 919       int spaces = SOURCE_COLUMN (map, src_loc) - 2;
 920       print.printed = 1;
 921
 922       while (-- spaces >= 0)
 923         putc (' ', print.outf);
 924     }
 925 }
 926
 927 static void
 928 cb_ident (cpp_reader *pfile ATTRIBUTE_UNUSED, source_location line,
 929           const cpp_string *str)
 930 {
 931   maybe_print_line (line);
 932   fprintf (print.outf, "#ident %s\n", str->text);
 933   print.src_line++;
 934 }
 935
 936 static void
 937 cb_define (cpp_reader *pfile ATTRIBUTE_UNUSED, source_location line,
 938            cpp_hashnode *node ATTRIBUTE_UNUSED)
 939 {
 940   maybe_print_line (line);
 941   fputs ("#define ", print.outf);
 942
 943   /* 'D' is whole definition; 'N' is name only.  */
 944   if (gfc_cpp_option.dump_macros == 'D')
 945     fputs ((const char *) cpp_macro_definition (pfile, node),
 946            print.outf);
 947   else
 948     fputs ((const char *) NODE_NAME (node), print.outf);
 949
 950   putc ('\n', print.outf);
 951   if (LOCATION_LINE (line) != 0)
 952     print.src_line++;
 953 }
 954
 955 static void
 956 cb_undef (cpp_reader *pfile ATTRIBUTE_UNUSED, source_location line,
 957           cpp_hashnode *node)
 958 {
 959   maybe_print_line (line);
 960   fprintf (print.outf, "#undef %s\n", NODE_NAME (node));
 961   print.src_line++;
 962 }
 963
 964 static void
 965 cb_include (cpp_reader *pfile ATTRIBUTE_UNUSED, source_location line,
 966             const unsigned char *dir, const char *header, int angle_brackets,
 967             const cpp_token **comments)
 968 {
 969   maybe_print_line (line);
 970   if (angle_brackets)
 971     fprintf (print.outf, "#%s <%s>", dir, header);
 972   else
 973     fprintf (print.outf, "#%s \"%s\"", dir, header);
 974
 975   if (comments != NULL)
 976     {
 977       while (*comments != NULL)
 978         {
 979           if ((*comments)->flags & PREV_WHITE)
 980             putc (' ', print.outf);
 981           cpp_output_token (*comments, print.outf);
 982           ++comments;
 983         }
 984     }
 985
 986   putc ('\n', print.outf);
 987   print.src_line++;
 988 }
 989
 990 /* Dump out the hash table.  */
 991 static int
 992 dump_macro (cpp_reader *pfile, cpp_hashnode *node, void *v ATTRIBUTE_UNUSED)
 993 {
 994   if (cpp_user_macro_p (node))
 995     {
 996       fputs ("#define ", print.outf);
 997       fputs ((const char *) cpp_macro_definition (pfile, node),
 998              print.outf);
 999       putc ('\n', print.outf);
1000       print.src_line++;
1001     }
1002
1003   return 1;
1004 }
1005
1006 static void
1007 cb_used_define (cpp_reader *pfile, source_location line ATTRIBUTE_UNUSED,
1008                 cpp_hashnode *node)
1009 {
1010   gfc_cpp_macro_queue *q;
1011   q = XNEW (gfc_cpp_macro_queue);
1012   q->macro = xstrdup ((const char *) cpp_macro_definition (pfile, node));
1013   q->next = cpp_define_queue;
1014   cpp_define_queue = q;
1015 }
1016
1017 /* Callback from cpp_error for PFILE to print diagnostics from the
1018    preprocessor.  The diagnostic is of type LEVEL, with REASON set
1019    to the reason code if LEVEL is represents a warning, at location
1020    RICHLOC; MSG is the translated message and AP the arguments.
1021    Returns true if a diagnostic was emitted, false otherwise.  */
1022
1023 static bool
1024 cb_cpp_diagnostic (cpp_reader *pfile ATTRIBUTE_UNUSED,
1025                    enum cpp_diagnostic_level level,
1026                    enum cpp_warning_reason reason,
1027                    rich_location *richloc,
1028                    const char *msg, va_list *ap)
1029 {
1030   diagnostic_info diagnostic;
1031   diagnostic_t dlevel;
1032   bool save_warn_system_headers = global_dc->dc_warn_system_headers;
1033   bool ret;
1034
1035   switch (level)
1036     {
1037     case CPP_DL_WARNING_SYSHDR:
1038       global_dc->dc_warn_system_headers = 1;
1039       /* Fall through.  */
1040     case CPP_DL_WARNING:
1041       dlevel = DK_WARNING;
1042       break;
1043     case CPP_DL_PEDWARN:
1044       dlevel = DK_PEDWARN;
1045       break;
1046     case CPP_DL_ERROR:
1047       dlevel = DK_ERROR;
1048       break;
1049     case CPP_DL_ICE:
1050       dlevel = DK_ICE;
1051       break;
1052     case CPP_DL_NOTE:
1053       dlevel = DK_NOTE;
1054       break;
1055     case CPP_DL_FATAL:
1056       dlevel = DK_FATAL;
1057       break;
1058     default:
1059       gcc_unreachable ();
1060     }
1061   diagnostic_set_info_translated (&diagnostic, msg, ap,
1062                                   richloc, dlevel);
1063   if (reason == CPP_W_WARNING_DIRECTIVE)
1064     diagnostic_override_option_index (&diagnostic, OPT_Wcpp);
1065   ret = diagnostic_report_diagnostic (global_dc, &diagnostic);
1066   if (level == CPP_DL_WARNING_SYSHDR)
1067     global_dc->dc_warn_system_headers = save_warn_system_headers;
1068   return ret;
1069 }
1070
1071 /* Callback called when -fworking-director and -E to emit working
1072    directory in cpp output file.  */
1073
1074 void
1075 pp_dir_change (cpp_reader *pfile ATTRIBUTE_UNUSED, const char *dir)
1076 {
1077   size_t to_file_len = strlen (dir);
1078   unsigned char *to_file_quoted =
1079      (unsigned char *) alloca (to_file_len * 4 + 1);
1080   unsigned char *p;
1081
1082   /* cpp_quote_string does not nul-terminate, so we have to do it ourselves.  */
1083   p = cpp_quote_string (to_file_quoted, (const unsigned char *) dir, to_file_len);
1084   *p = '\0';
1085   fprintf (print.outf, "# 1 \"%s//\"\n", to_file_quoted);
1086 }
1087
1088 /* Copy a #pragma directive to the preprocessed output.  */
1089 static void
1090 cb_def_pragma (cpp_reader *pfile, source_location line)
1091 {
1092   maybe_print_line (line);
1093   fputs ("#pragma ", print.outf);
1094   cpp_output_line (pfile, print.outf);
1095   print.src_line++;
1096 }
1097
1098 static void
1099 cb_used_undef (cpp_reader *pfile ATTRIBUTE_UNUSED,
1100                source_location line ATTRIBUTE_UNUSED,
1101                cpp_hashnode *node)
1102 {
1103   gfc_cpp_macro_queue *q;
1104   q = XNEW (gfc_cpp_macro_queue);
1105   q->macro = xstrdup ((const char *) NODE_NAME (node));
1106   q->next = cpp_undefine_queue;
1107   cpp_undefine_queue = q;
1108 }
1109
1110 static void
1111 dump_queued_macros (cpp_reader *pfile ATTRIBUTE_UNUSED)
1112 {
1113   gfc_cpp_macro_queue *q;
1114
1115   /* End the previous line of text.  */
1116   if (print.printed)
1117     {
1118       putc ('\n', print.outf);
1119       print.src_line++;
1120       print.printed = 0;
1121     }
1122
1123   for (q = cpp_define_queue; q;)
1124     {
1125       gfc_cpp_macro_queue *oq;
1126       fputs ("#define ", print.outf);
1127       fputs (q->macro, print.outf);
1128       putc ('\n', print.outf);
1129       print.src_line++;
1130       oq = q;
1131       q = q->next;
1132       free (oq->macro);
1133       free (oq);
1134     }
1135   cpp_define_queue = NULL;
1136   for (q = cpp_undefine_queue; q;)
1137     {
1138       gfc_cpp_macro_queue *oq;
1139       fprintf (print.outf, "#undef %s\n", q->macro);
1140       print.src_line++;
1141       oq = q;
1142       q = q->next;
1143       free (oq->macro);
1144       free (oq);
1145     }
1146   cpp_undefine_queue = NULL;
1147 }