gcc/c-family/c-ppoutput.c

   1 /* Preprocess only, using cpplib.
   2    Copyright (C) 1995-2017 Free Software Foundation, Inc.
   3    Written by Per Bothner, 1994-95.
   4
   5    This program is free software; you can redistribute it and/or modify it
   6    under the terms of the GNU General Public License as published by the
   7    Free Software Foundation; either version 3, or (at your option) any
   8    later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program; 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 "c-common.h"           /* For flags.  */
  23 #include "../libcpp/internal.h"
  24 #include "c-pragma.h"           /* For parse_in.  */
  25
  26 /* Encapsulates state used to convert a stream of tokens into a text
  27    file.  */
  28 static struct
  29 {
  30   FILE *outf;                   /* Stream to write to.  */
  31   const cpp_token *prev;        /* Previous token.  */
  32   const cpp_token *source;      /* Source token for spacing.  */
  33   int src_line;                 /* Line number currently being written.  */
  34   bool printed;                 /* True if something output at line.  */
  35   bool first_time;              /* pp_file_change hasn't been called yet.  */
  36   bool prev_was_system_token;   /* True if the previous token was a
  37                                    system token.*/
  38   const char *src_file;         /* Current source file.  */
  39 } print;
  40
  41 /* Defined and undefined macros being queued for output with -dU at
  42    the next newline.  */
  43 struct macro_queue
  44 {
  45   struct macro_queue *next;     /* Next macro in the list.  */
  46   char *macro;                  /* The name of the macro if not
  47                                    defined, the full definition if
  48                                    defined.  */
  49 };
  50 static macro_queue *define_queue, *undef_queue;
  51
  52 /* General output routines.  */
  53 static void scan_translation_unit (cpp_reader *);
  54 static void print_lines_directives_only (int, const void *, size_t);
  55 static void scan_translation_unit_directives_only (cpp_reader *);
  56 static void scan_translation_unit_trad (cpp_reader *);
  57 static void account_for_newlines (const unsigned char *, size_t);
  58 static int dump_macro (cpp_reader *, cpp_hashnode *, void *);
  59 static void dump_queued_macros (cpp_reader *);
  60
  61 static bool print_line_1 (source_location, const char*, FILE *);
  62 static bool print_line (source_location, const char *);
  63 static bool maybe_print_line_1 (source_location, FILE *);
  64 static bool maybe_print_line (source_location);
  65 static bool do_line_change (cpp_reader *, const cpp_token *,
  66                             source_location, int);
  67
  68 /* Callback routines for the parser.   Most of these are active only
  69    in specific modes.  */
  70 static void cb_line_change (cpp_reader *, const cpp_token *, int);
  71 static void cb_define (cpp_reader *, source_location, cpp_hashnode *);
  72 static void cb_undef (cpp_reader *, source_location, cpp_hashnode *);
  73 static void cb_used_define (cpp_reader *, source_location, cpp_hashnode *);
  74 static void cb_used_undef (cpp_reader *, source_location, cpp_hashnode *);
  75 static void cb_include (cpp_reader *, source_location, const unsigned char *,
  76                         const char *, int, const cpp_token **);
  77 static void cb_ident (cpp_reader *, source_location, const cpp_string *);
  78 static void cb_def_pragma (cpp_reader *, source_location);
  79 static void cb_read_pch (cpp_reader *pfile, const char *name,
  80                          int fd, const char *orig_name);
  81
  82 /* Preprocess and output.  */
  83 void
  84 preprocess_file (cpp_reader *pfile)
  85 {
  86   /* A successful cpp_read_main_file guarantees that we can call
  87      cpp_scan_nooutput or cpp_get_token next.  */
  88   if (flag_no_output && pfile->buffer)
  89     {
  90       /* Scan -included buffers, then the main file.  */
  91       while (pfile->buffer->prev)
  92         cpp_scan_nooutput (pfile);
  93       cpp_scan_nooutput (pfile);
  94     }
  95   else if (cpp_get_options (pfile)->traditional)
  96     scan_translation_unit_trad (pfile);
  97   else if (cpp_get_options (pfile)->directives_only
  98            && !cpp_get_options (pfile)->preprocessed)
  99     scan_translation_unit_directives_only (pfile);
 100   else
 101     scan_translation_unit (pfile);
 102
 103   /* -dM command line option.  Should this be elsewhere?  */
 104   if (flag_dump_macros == 'M')
 105     cpp_forall_identifiers (pfile, dump_macro, NULL);
 106
 107   /* Flush any pending output.  */
 108   if (print.printed)
 109     putc ('\n', print.outf);
 110 }
 111
 112 /* Set up the callbacks as appropriate.  */
 113 void
 114 init_pp_output (FILE *out_stream)
 115 {
 116   cpp_callbacks *cb = cpp_get_callbacks (parse_in);
 117
 118   if (!flag_no_output)
 119     {
 120       cb->line_change = cb_line_change;
 121       /* Don't emit #pragma or #ident directives if we are processing
 122          assembly language; the assembler may choke on them.  */
 123       if (cpp_get_options (parse_in)->lang != CLK_ASM)
 124         {
 125           cb->ident      = cb_ident;
 126           cb->def_pragma = cb_def_pragma;
 127         }
 128     }
 129
 130   if (flag_dump_includes)
 131     cb->include  = cb_include;
 132
 133   if (flag_pch_preprocess)
 134     {
 135       cb->valid_pch = c_common_valid_pch;
 136       cb->read_pch = cb_read_pch;
 137     }
 138
 139   if (flag_dump_macros == 'N' || flag_dump_macros == 'D')
 140     {
 141       cb->define = cb_define;
 142       cb->undef  = cb_undef;
 143     }
 144
 145   if (flag_dump_macros == 'U')
 146     {
 147       cb->before_define = dump_queued_macros;
 148       cb->used_define = cb_used_define;
 149       cb->used_undef = cb_used_undef;
 150     }
 151
 152   cb->has_attribute = c_common_has_attribute;
 153   cb->get_source_date_epoch = cb_get_source_date_epoch;
 154
 155   /* Initialize the print structure.  */
 156   print.src_line = 1;
 157   print.printed = false;
 158   print.prev = 0;
 159   print.outf = out_stream;
 160   print.first_time = 1;
 161   print.src_file = "";
 162   print.prev_was_system_token = false;
 163 }
 164
 165 /* Writes out the preprocessed file, handling spacing and paste
 166    avoidance issues.  */
 167 static void
 168 scan_translation_unit (cpp_reader *pfile)
 169 {
 170   bool avoid_paste = false;
 171   bool do_line_adjustments
 172     = cpp_get_options (parse_in)->lang != CLK_ASM
 173       && !flag_no_line_commands;
 174   bool in_pragma = false;
 175   bool line_marker_emitted = false;
 176
 177   print.source = NULL;
 178   for (;;)
 179     {
 180       source_location loc;
 181       const cpp_token *token = cpp_get_token_with_location (pfile, &loc);
 182
 183       if (token->type == CPP_PADDING)
 184         {
 185           avoid_paste = true;
 186           if (print.source == NULL
 187               || (!(print.source->flags & PREV_WHITE)
 188                   && token->val.source == NULL))
 189             print.source = token->val.source;
 190           continue;
 191         }
 192
 193       if (token->type == CPP_EOF)
 194         break;
 195
 196       /* Subtle logic to output a space if and only if necessary.  */
 197       if (avoid_paste)
 198         {
 199           int src_line = LOCATION_LINE (loc);
 200
 201           if (print.source == NULL)
 202             print.source = token;
 203
 204           if (src_line != print.src_line
 205               && do_line_adjustments
 206               && !in_pragma)
 207             {
 208               line_marker_emitted = do_line_change (pfile, token, loc, false);
 209               putc (' ', print.outf);
 210               print.printed = true;
 211             }
 212           else if (print.source->flags & PREV_WHITE
 213                    || (print.prev
 214                        && cpp_avoid_paste (pfile, print.prev, token))
 215                    || (print.prev == NULL && token->type == CPP_HASH))
 216             {
 217               putc (' ', print.outf);
 218               print.printed = true;
 219             }
 220         }
 221       else if (token->flags & PREV_WHITE)
 222         {
 223           int src_line = LOCATION_LINE (loc);
 224
 225           if (src_line != print.src_line
 226               && do_line_adjustments
 227               && !in_pragma)
 228             line_marker_emitted = do_line_change (pfile, token, loc, false);
 229           putc (' ', print.outf);
 230           print.printed = true;
 231         }
 232
 233       avoid_paste = false;
 234       print.source = NULL;
 235       print.prev = token;
 236       if (token->type == CPP_PRAGMA)
 237         {
 238           const char *space;
 239           const char *name;
 240
 241           line_marker_emitted = maybe_print_line (token->src_loc);
 242           fputs ("#pragma ", print.outf);
 243           c_pp_lookup_pragma (token->val.pragma, &space, &name);
 244           if (space)
 245             fprintf (print.outf, "%s %s", space, name);
 246           else
 247             fprintf (print.outf, "%s", name);
 248           print.printed = true;
 249           in_pragma = true;
 250         }
 251       else if (token->type == CPP_PRAGMA_EOL)
 252         {
 253           maybe_print_line (token->src_loc);
 254           in_pragma = false;
 255         }
 256       else
 257         {
 258           if (cpp_get_options (parse_in)->debug)
 259             linemap_dump_location (line_table, token->src_loc, print.outf);
 260
 261           if (do_line_adjustments
 262               && !in_pragma
 263               && !line_marker_emitted
 264               && print.prev_was_system_token != !!in_system_header_at (loc)
 265               && !is_location_from_builtin_token (loc))
 266             /* The system-ness of this token is different from the one
 267                of the previous token.  Let's emit a line change to
 268                mark the new system-ness before we emit the token.  */
 269             {
 270               do_line_change (pfile, token, loc, false);
 271               print.prev_was_system_token = !!in_system_header_at (loc);
 272             }
 273           cpp_output_token (token, print.outf);
 274           line_marker_emitted = false;
 275           print.printed = true;
 276         }
 277
 278       /* CPP_COMMENT tokens and raw-string literal tokens can
 279          have embedded new-line characters.  Rather than enumerating
 280          all the possible token types just check if token uses
 281          val.str union member.  */
 282       if (cpp_token_val_index (token) == CPP_TOKEN_FLD_STR)
 283         account_for_newlines (token->val.str.text, token->val.str.len);
 284     }
 285 }
 286
 287 static void
 288 print_lines_directives_only (int lines, const void *buf, size_t size)
 289 {
 290   print.src_line += lines;
 291   fwrite (buf, 1, size, print.outf);
 292 }
 293
 294 /* Writes out the preprocessed file, handling spacing and paste
 295    avoidance issues.  */
 296 static void
 297 scan_translation_unit_directives_only (cpp_reader *pfile)
 298 {
 299   struct _cpp_dir_only_callbacks cb;
 300
 301   cb.print_lines = print_lines_directives_only;
 302   cb.maybe_print_line = (void (*) (source_location)) maybe_print_line;
 303
 304   _cpp_preprocess_dir_only (pfile, &cb);
 305 }
 306
 307 /* Adjust print.src_line for newlines embedded in output.  */
 308 static void
 309 account_for_newlines (const unsigned char *str, size_t len)
 310 {
 311   while (len--)
 312     if (*str++ == '\n')
 313       print.src_line++;
 314 }
 315
 316 /* Writes out a traditionally preprocessed file.  */
 317 static void
 318 scan_translation_unit_trad (cpp_reader *pfile)
 319 {
 320   while (_cpp_read_logical_line_trad (pfile))
 321     {
 322       size_t len = pfile->out.cur - pfile->out.base;
 323       maybe_print_line (pfile->out.first_line);
 324       fwrite (pfile->out.base, 1, len, print.outf);
 325       print.printed = true;
 326       if (!CPP_OPTION (pfile, discard_comments))
 327         account_for_newlines (pfile->out.base, len);
 328     }
 329 }
 330
 331 /* If the token read on logical line LINE needs to be output on a
 332    different line to the current one, output the required newlines or
 333    a line marker.  If a line marker was emitted, return TRUE otherwise
 334    return FALSE.  */
 335
 336 static bool
 337 maybe_print_line_1 (source_location src_loc, FILE *stream)
 338 {
 339   bool emitted_line_marker = false;
 340   int src_line = LOCATION_LINE (src_loc);
 341   const char *src_file = LOCATION_FILE (src_loc);
 342
 343   /* End the previous line of text.  */
 344   if (print.printed)
 345     {
 346       putc ('\n', stream);
 347       print.src_line++;
 348       print.printed = false;
 349     }
 350
 351   if (!flag_no_line_commands
 352       && src_line >= print.src_line
 353       && src_line < print.src_line + 8
 354       && strcmp (src_file, print.src_file) == 0)
 355     {
 356       while (src_line > print.src_line)
 357         {
 358           putc ('\n', stream);
 359           print.src_line++;
 360         }
 361     }
 362   else
 363     emitted_line_marker = print_line_1 (src_loc, "", stream);
 364
 365   return emitted_line_marker;
 366 }
 367
 368 /* If the token read on logical line LINE needs to be output on a
 369    different line to the current one, output the required newlines or
 370    a line marker.  If a line marker was emitted, return TRUE otherwise
 371    return FALSE.  */
 372
 373 static bool
 374 maybe_print_line (source_location src_loc)
 375 {
 376   if (cpp_get_options (parse_in)->debug)
 377     linemap_dump_location (line_table, src_loc,
 378                            print.outf);
 379   return maybe_print_line_1 (src_loc, print.outf);
 380 }
 381
 382 /* Output a line marker for logical line LINE.  Special flags are "1"
 383    or "2" indicating entering or leaving a file.  If the line marker
 384    was effectively emitted, return TRUE otherwise return FALSE.  */
 385
 386 static bool
 387 print_line_1 (source_location src_loc, const char *special_flags, FILE *stream)
 388 {
 389   bool emitted_line_marker = false;
 390
 391   /* End any previous line of text.  */
 392   if (print.printed)
 393     putc ('\n', stream);
 394   print.printed = false;
 395
 396   if (!flag_no_line_commands)
 397     {
 398       const char *file_path = LOCATION_FILE (src_loc);
 399       int sysp;
 400       size_t to_file_len = strlen (file_path);
 401       unsigned char *to_file_quoted =
 402          (unsigned char *) alloca (to_file_len * 4 + 1);
 403       unsigned char *p;
 404
 405       print.src_line = LOCATION_LINE (src_loc);
 406       print.src_file = file_path;
 407
 408       /* cpp_quote_string does not nul-terminate, so we have to do it
 409          ourselves.  */
 410       p = cpp_quote_string (to_file_quoted,
 411                             (const unsigned char *) file_path,
 412                             to_file_len);
 413       *p = '\0';
 414       fprintf (stream, "# %u \"%s\"%s",
 415                print.src_line == 0 ? 1 : print.src_line,
 416                to_file_quoted, special_flags);
 417
 418       sysp = in_system_header_at (src_loc);
 419       if (sysp == 2)
 420         fputs (" 3 4", stream);
 421       else if (sysp == 1)
 422         fputs (" 3", stream);
 423
 424       putc ('\n', stream);
 425       emitted_line_marker = true;
 426     }
 427
 428   return emitted_line_marker;
 429 }
 430
 431 /* Output a line marker for logical line LINE.  Special flags are "1"
 432    or "2" indicating entering or leaving a file.  Return TRUE if a
 433    line marker was effectively emitted, FALSE otherwise.  */
 434
 435 static bool
 436 print_line (source_location src_loc, const char *special_flags)
 437 {
 438     if (cpp_get_options (parse_in)->debug)
 439       linemap_dump_location (line_table, src_loc,
 440                              print.outf);
 441     return print_line_1 (src_loc, special_flags, print.outf);
 442 }
 443
 444 /* Helper function for cb_line_change and scan_translation_unit.
 445    Return TRUE if a line marker is emitted, FALSE otherwise.  */
 446 static bool
 447 do_line_change (cpp_reader *pfile, const cpp_token *token,
 448                 source_location src_loc, int parsing_args)
 449 {
 450   bool emitted_line_marker = false;
 451   if (define_queue || undef_queue)
 452     dump_queued_macros (pfile);
 453
 454   if (token->type == CPP_EOF || parsing_args)
 455     return false;
 456
 457   emitted_line_marker = maybe_print_line (src_loc);
 458   print.prev = 0;
 459   print.source = 0;
 460
 461   /* Supply enough spaces to put this token in its original column,
 462      one space per column greater than 2, since scan_translation_unit
 463      will provide a space if PREV_WHITE.  Don't bother trying to
 464      reconstruct tabs; we can't get it right in general, and nothing
 465      ought to care.  Some things do care; the fault lies with them.  */
 466   if (!CPP_OPTION (pfile, traditional))
 467     {
 468       int spaces = LOCATION_COLUMN (src_loc) - 2;
 469       print.printed = true;
 470
 471       while (-- spaces >= 0)
 472         putc (' ', print.outf);
 473     }
 474
 475   return emitted_line_marker;
 476 }
 477
 478 /* Called when a line of output is started.  TOKEN is the first token
 479    of the line, and at end of file will be CPP_EOF.  */
 480 static void
 481 cb_line_change (cpp_reader *pfile, const cpp_token *token,
 482                 int parsing_args)
 483 {
 484   do_line_change (pfile, token, token->src_loc, parsing_args);
 485 }
 486
 487 static void
 488 cb_ident (cpp_reader *pfile ATTRIBUTE_UNUSED, source_location line,
 489           const cpp_string *str)
 490 {
 491   maybe_print_line (line);
 492   fprintf (print.outf, "#ident %s\n", str->text);
 493   print.src_line++;
 494 }
 495
 496 static void
 497 cb_define (cpp_reader *pfile, source_location line, cpp_hashnode *node)
 498 {
 499   const line_map_ordinary *map;
 500
 501   maybe_print_line (line);
 502   fputs ("#define ", print.outf);
 503
 504   /* 'D' is whole definition; 'N' is name only.  */
 505   if (flag_dump_macros == 'D')
 506     fputs ((const char *) cpp_macro_definition (pfile, node),
 507            print.outf);
 508   else
 509     fputs ((const char *) NODE_NAME (node), print.outf);
 510
 511   putc ('\n', print.outf);
 512   print.printed = false;
 513   linemap_resolve_location (line_table, line,
 514                             LRK_MACRO_DEFINITION_LOCATION,
 515                             &map);
 516   if (LINEMAP_LINE (map) != 0)
 517     print.src_line++;
 518 }
 519
 520 static void
 521 cb_undef (cpp_reader *pfile ATTRIBUTE_UNUSED, source_location line,
 522           cpp_hashnode *node)
 523 {
 524   maybe_print_line (line);
 525   fprintf (print.outf, "#undef %s\n", NODE_NAME (node));
 526   print.src_line++;
 527 }
 528
 529 static void
 530 cb_used_define (cpp_reader *pfile, source_location line ATTRIBUTE_UNUSED,
 531                 cpp_hashnode *node)
 532 {
 533   macro_queue *q;
 534   if (node->flags & NODE_BUILTIN)
 535     return;
 536   q = XNEW (macro_queue);
 537   q->macro = xstrdup ((const char *) cpp_macro_definition (pfile, node));
 538   q->next = define_queue;
 539   define_queue = q;
 540 }
 541
 542 static void
 543 cb_used_undef (cpp_reader *pfile ATTRIBUTE_UNUSED,
 544                source_location line ATTRIBUTE_UNUSED,
 545                cpp_hashnode *node)
 546 {
 547   macro_queue *q;
 548   q = XNEW (macro_queue);
 549   q->macro = xstrdup ((const char *) NODE_NAME (node));
 550   q->next = undef_queue;
 551   undef_queue = q;
 552 }
 553
 554 static void
 555 dump_queued_macros (cpp_reader *pfile ATTRIBUTE_UNUSED)
 556 {
 557   macro_queue *q;
 558
 559   /* End the previous line of text.  */
 560   if (print.printed)
 561     {
 562       putc ('\n', print.outf);
 563       print.src_line++;
 564       print.printed = false;
 565     }
 566
 567   for (q = define_queue; q;)
 568     {
 569       macro_queue *oq;
 570       fputs ("#define ", print.outf);
 571       fputs (q->macro, print.outf);
 572       putc ('\n', print.outf);
 573       print.printed = false;
 574       print.src_line++;
 575       oq = q;
 576       q = q->next;
 577       free (oq->macro);
 578       free (oq);
 579     }
 580   define_queue = NULL;
 581   for (q = undef_queue; q;)
 582     {
 583       macro_queue *oq;
 584       fprintf (print.outf, "#undef %s\n", q->macro);
 585       print.src_line++;
 586       oq = q;
 587       q = q->next;
 588       free (oq->macro);
 589       free (oq);
 590     }
 591   undef_queue = NULL;
 592 }
 593
 594 static void
 595 cb_include (cpp_reader *pfile ATTRIBUTE_UNUSED, source_location line,
 596             const unsigned char *dir, const char *header, int angle_brackets,
 597             const cpp_token **comments)
 598 {
 599   maybe_print_line (line);
 600   if (angle_brackets)
 601     fprintf (print.outf, "#%s <%s>", dir, header);
 602   else
 603     fprintf (print.outf, "#%s \"%s\"", dir, header);
 604
 605   if (comments != NULL)
 606     {
 607       while (*comments != NULL)
 608         {
 609           if ((*comments)->flags & PREV_WHITE)
 610             putc (' ', print.outf);
 611           cpp_output_token (*comments, print.outf);
 612           ++comments;
 613         }
 614     }
 615
 616   putc ('\n', print.outf);
 617   print.printed = false;
 618   print.src_line++;
 619 }
 620
 621 /* Callback called when -fworking-director and -E to emit working
 622    directory in cpp output file.  */
 623
 624 void
 625 pp_dir_change (cpp_reader *pfile ATTRIBUTE_UNUSED, const char *dir)
 626 {
 627   size_t to_file_len = strlen (dir);
 628   unsigned char *to_file_quoted =
 629      (unsigned char *) alloca (to_file_len * 4 + 1);
 630   unsigned char *p;
 631
 632   /* cpp_quote_string does not nul-terminate, so we have to do it ourselves.  */
 633   p = cpp_quote_string (to_file_quoted, (const unsigned char *) dir, to_file_len);
 634   *p = '\0';
 635   fprintf (print.outf, "# 1 \"%s//\"\n", to_file_quoted);
 636 }
 637
 638 /* The file name, line number or system header flags have changed, as
 639    described in MAP.  */
 640
 641 void
 642 pp_file_change (const line_map_ordinary *map)
 643 {
 644   const char *flags = "";
 645
 646   if (flag_no_line_commands)
 647     return;
 648
 649   if (map != NULL)
 650     {
 651       input_location = map->start_location;
 652       if (print.first_time)
 653         {
 654           /* Avoid printing foo.i when the main file is foo.c.  */
 655           if (!cpp_get_options (parse_in)->preprocessed)
 656             print_line (map->start_location, flags);
 657           print.first_time = 0;
 658         }
 659       else
 660         {
 661           /* Bring current file to correct line when entering a new file.  */
 662           if (map->reason == LC_ENTER)
 663             {
 664               const line_map_ordinary *from = INCLUDED_FROM (line_table, map);
 665               maybe_print_line (LAST_SOURCE_LINE_LOCATION (from));
 666             }
 667           if (map->reason == LC_ENTER)
 668             flags = " 1";
 669           else if (map->reason == LC_LEAVE)
 670             flags = " 2";
 671           print_line (map->start_location, flags);
 672         }
 673     }
 674 }
 675
 676 /* Copy a #pragma directive to the preprocessed output.  */
 677 static void
 678 cb_def_pragma (cpp_reader *pfile, source_location line)
 679 {
 680   maybe_print_line (line);
 681   fputs ("#pragma ", print.outf);
 682   cpp_output_line (pfile, print.outf);
 683   print.printed = false;
 684   print.src_line++;
 685 }
 686
 687 /* Dump out the hash table.  */
 688 static int
 689 dump_macro (cpp_reader *pfile, cpp_hashnode *node, void *v ATTRIBUTE_UNUSED)
 690 {
 691   if (node->type == NT_MACRO && !(node->flags & NODE_BUILTIN))
 692     {
 693       fputs ("#define ", print.outf);
 694       fputs ((const char *) cpp_macro_definition (pfile, node),
 695              print.outf);
 696       putc ('\n', print.outf);
 697       print.printed = false;
 698       print.src_line++;
 699     }
 700
 701   return 1;
 702 }
 703
 704 /* Load in the PCH file NAME, open on FD.  It was originally searched for
 705    by ORIG_NAME.  Also, print out a #include command so that the PCH
 706    file can be loaded when the preprocessed output is compiled.  */
 707
 708 static void
 709 cb_read_pch (cpp_reader *pfile, const char *name,
 710              int fd, const char *orig_name ATTRIBUTE_UNUSED)
 711 {
 712   c_common_read_pch (pfile, name, fd, orig_name);
 713
 714   fprintf (print.outf, "#pragma GCC pch_preprocess \"%s\"\n", name);
 715   print.src_line++;
 716 }