gcc/c-family/c-ppoutput.c

   1 /* Preprocess only, using cpplib.
   2    Copyright (C) 1995-2020 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 #include "file-prefix-map.h"    /* remap_macro_filename()  */
  26
  27 /* Encapsulates state used to convert a stream of tokens into a text
  28    file.  */
  29 static struct
  30 {
  31   FILE *outf;                   /* Stream to write to.  */
  32   const cpp_token *prev;        /* Previous token.  */
  33   const cpp_token *source;      /* Source token for spacing.  */
  34   int src_line;                 /* Line number currently being written.  */
  35   bool printed;                 /* True if something output at line.  */
  36   bool first_time;              /* pp_file_change hasn't been called yet.  */
  37   bool prev_was_system_token;   /* True if the previous token was a
  38                                    system token.*/
  39   const char *src_file;         /* Current source file.  */
  40 } print;
  41
  42 /* Defined and undefined macros being queued for output with -dU at
  43    the next newline.  */
  44 struct macro_queue
  45 {
  46   struct macro_queue *next;     /* Next macro in the list.  */
  47   char *macro;                  /* The name of the macro if not
  48                                    defined, the full definition if
  49                                    defined.  */
  50 };
  51 static macro_queue *define_queue, *undef_queue;
  52
  53 /* General output routines.  */
  54 static void scan_translation_unit (cpp_reader *);
  55 static void print_lines_directives_only (int, const void *, size_t);
  56 static void scan_translation_unit_directives_only (cpp_reader *);
  57 static void scan_translation_unit_trad (cpp_reader *);
  58 static void account_for_newlines (const unsigned char *, size_t);
  59 static int dump_macro (cpp_reader *, cpp_hashnode *, void *);
  60 static void dump_queued_macros (cpp_reader *);
  61
  62 static bool print_line_1 (location_t, const char*, FILE *);
  63 static bool print_line (location_t, const char *);
  64 static bool maybe_print_line_1 (location_t, FILE *);
  65 static bool maybe_print_line (location_t);
  66 static bool do_line_change (cpp_reader *, const cpp_token *,
  67                             location_t, int);
  68
  69 /* Callback routines for the parser.   Most of these are active only
  70    in specific modes.  */
  71 static void cb_line_change (cpp_reader *, const cpp_token *, int);
  72 static void cb_define (cpp_reader *, location_t, cpp_hashnode *);
  73 static void cb_undef (cpp_reader *, location_t, cpp_hashnode *);
  74 static void cb_used_define (cpp_reader *, location_t, cpp_hashnode *);
  75 static void cb_used_undef (cpp_reader *, location_t, cpp_hashnode *);
  76 static void cb_include (cpp_reader *, location_t, const unsigned char *,
  77                         const char *, int, const cpp_token **);
  78 static void cb_ident (cpp_reader *, location_t, const cpp_string *);
  79 static void cb_def_pragma (cpp_reader *, location_t);
  80 static void cb_read_pch (cpp_reader *pfile, const char *name,
  81                          int fd, const char *orig_name);
  82
  83 /* Preprocess and output.  */
  84 void
  85 preprocess_file (cpp_reader *pfile)
  86 {
  87   /* A successful cpp_read_main_file guarantees that we can call
  88      cpp_scan_nooutput or cpp_get_token next.  */
  89   if (flag_no_output && pfile->buffer)
  90     {
  91       /* Scan -included buffers, then the main file.  */
  92       while (pfile->buffer->prev)
  93         cpp_scan_nooutput (pfile);
  94       cpp_scan_nooutput (pfile);
  95     }
  96   else if (cpp_get_options (pfile)->traditional)
  97     scan_translation_unit_trad (pfile);
  98   else if (cpp_get_options (pfile)->directives_only
  99            && !cpp_get_options (pfile)->preprocessed)
 100     scan_translation_unit_directives_only (pfile);
 101   else
 102     scan_translation_unit (pfile);
 103
 104   /* -dM command line option.  Should this be elsewhere?  */
 105   if (flag_dump_macros == 'M')
 106     cpp_forall_identifiers (pfile, dump_macro, NULL);
 107
 108   /* Flush any pending output.  */
 109   if (print.printed)
 110     putc ('\n', print.outf);
 111 }
 112
 113 /* Set up the callbacks as appropriate.  */
 114 void
 115 init_pp_output (FILE *out_stream)
 116 {
 117   cpp_callbacks *cb = cpp_get_callbacks (parse_in);
 118
 119   if (!flag_no_output)
 120     {
 121       cb->line_change = cb_line_change;
 122       /* Don't emit #pragma or #ident directives if we are processing
 123          assembly language; the assembler may choke on them.  */
 124       if (cpp_get_options (parse_in)->lang != CLK_ASM)
 125         {
 126           cb->ident      = cb_ident;
 127           cb->def_pragma = cb_def_pragma;
 128         }
 129     }
 130
 131   if (flag_dump_includes)
 132     cb->include  = cb_include;
 133
 134   if (flag_pch_preprocess)
 135     {
 136       cb->valid_pch = c_common_valid_pch;
 137       cb->read_pch = cb_read_pch;
 138     }
 139
 140   if (flag_dump_macros == 'N' || flag_dump_macros == 'D')
 141     {
 142       cb->define = cb_define;
 143       cb->undef  = cb_undef;
 144     }
 145
 146   if (flag_dump_macros == 'U')
 147     {
 148       cb->before_define = dump_queued_macros;
 149       cb->used_define = cb_used_define;
 150       cb->used_undef = cb_used_undef;
 151     }
 152
 153   cb->has_attribute = c_common_has_attribute;
 154   cb->has_builtin = c_common_has_builtin;
 155   cb->get_source_date_epoch = cb_get_source_date_epoch;
 156   cb->remap_filename = remap_macro_filename;
 157
 158   /* Initialize the print structure.  */
 159   print.src_line = 1;
 160   print.printed = false;
 161   print.prev = 0;
 162   print.outf = out_stream;
 163   print.first_time = 1;
 164   print.src_file = "";
 165   print.prev_was_system_token = false;
 166 }
 167
 168 /* Writes out the preprocessed file, handling spacing and paste
 169    avoidance issues.  */
 170 static void
 171 scan_translation_unit (cpp_reader *pfile)
 172 {
 173   bool avoid_paste = false;
 174   bool do_line_adjustments
 175     = cpp_get_options (parse_in)->lang != CLK_ASM
 176       && !flag_no_line_commands;
 177   bool in_pragma = false;
 178   bool line_marker_emitted = false;
 179
 180   print.source = NULL;
 181   for (;;)
 182     {
 183       location_t loc;
 184       const cpp_token *token = cpp_get_token_with_location (pfile, &loc);
 185
 186       if (token->type == CPP_PADDING)
 187         {
 188           avoid_paste = true;
 189           if (print.source == NULL
 190               || (!(print.source->flags & PREV_WHITE)
 191                   && token->val.source == NULL))
 192             print.source = token->val.source;
 193           continue;
 194         }
 195
 196       if (token->type == CPP_EOF)
 197         break;
 198
 199       /* Subtle logic to output a space if and only if necessary.  */
 200       if (avoid_paste)
 201         {
 202           int src_line = LOCATION_LINE (loc);
 203
 204           if (print.source == NULL)
 205             print.source = token;
 206
 207           if (src_line != print.src_line
 208               && do_line_adjustments
 209               && !in_pragma)
 210             {
 211               line_marker_emitted = do_line_change (pfile, token, loc, false);
 212               putc (' ', print.outf);
 213               print.printed = true;
 214             }
 215           else if (print.source->flags & PREV_WHITE
 216                    || (print.prev
 217                        && cpp_avoid_paste (pfile, print.prev, token))
 218                    || (print.prev == NULL && token->type == CPP_HASH))
 219             {
 220               putc (' ', print.outf);
 221               print.printed = true;
 222             }
 223         }
 224       else if (token->flags & PREV_WHITE)
 225         {
 226           int src_line = LOCATION_LINE (loc);
 227
 228           if (src_line != print.src_line
 229               && do_line_adjustments
 230               && !in_pragma)
 231             line_marker_emitted = do_line_change (pfile, token, loc, false);
 232           putc (' ', print.outf);
 233           print.printed = true;
 234         }
 235
 236       avoid_paste = false;
 237       print.source = NULL;
 238       print.prev = token;
 239       if (token->type == CPP_PRAGMA)
 240         {
 241           const char *space;
 242           const char *name;
 243
 244           line_marker_emitted = maybe_print_line (token->src_loc);
 245           fputs ("#pragma ", print.outf);
 246           c_pp_lookup_pragma (token->val.pragma, &space, &name);
 247           if (space)
 248             fprintf (print.outf, "%s %s", space, name);
 249           else
 250             fprintf (print.outf, "%s", name);
 251           print.printed = true;
 252           in_pragma = true;
 253         }
 254       else if (token->type == CPP_PRAGMA_EOL)
 255         {
 256           maybe_print_line (token->src_loc);
 257           in_pragma = false;
 258         }
 259       else
 260         {
 261           if (cpp_get_options (parse_in)->debug)
 262             linemap_dump_location (line_table, token->src_loc, print.outf);
 263
 264           if (do_line_adjustments
 265               && !in_pragma
 266               && !line_marker_emitted
 267               && print.prev_was_system_token != !!in_system_header_at (loc)
 268               && !is_location_from_builtin_token (loc))
 269             /* The system-ness of this token is different from the one
 270                of the previous token.  Let's emit a line change to
 271                mark the new system-ness before we emit the token.  */
 272             {
 273               do_line_change (pfile, token, loc, false);
 274               print.prev_was_system_token = !!in_system_header_at (loc);
 275             }
 276           cpp_output_token (token, print.outf);
 277           line_marker_emitted = false;
 278           print.printed = true;
 279         }
 280
 281       /* CPP_COMMENT tokens and raw-string literal tokens can
 282          have embedded new-line characters.  Rather than enumerating
 283          all the possible token types just check if token uses
 284          val.str union member.  */
 285       if (cpp_token_val_index (token) == CPP_TOKEN_FLD_STR)
 286         account_for_newlines (token->val.str.text, token->val.str.len);
 287     }
 288 }
 289
 290 static void
 291 print_lines_directives_only (int lines, const void *buf, size_t size)
 292 {
 293   print.src_line += lines;
 294   fwrite (buf, 1, size, print.outf);
 295 }
 296
 297 /* Writes out the preprocessed file, handling spacing and paste
 298    avoidance issues.  */
 299 static void
 300 scan_translation_unit_directives_only (cpp_reader *pfile)
 301 {
 302   struct _cpp_dir_only_callbacks cb;
 303
 304   cb.print_lines = print_lines_directives_only;
 305   cb.maybe_print_line = maybe_print_line;
 306
 307   _cpp_preprocess_dir_only (pfile, &cb);
 308 }
 309
 310 /* Adjust print.src_line for newlines embedded in output.  */
 311 static void
 312 account_for_newlines (const unsigned char *str, size_t len)
 313 {
 314   while (len--)
 315     if (*str++ == '\n')
 316       print.src_line++;
 317 }
 318
 319 /* Writes out a traditionally preprocessed file.  */
 320 static void
 321 scan_translation_unit_trad (cpp_reader *pfile)
 322 {
 323   while (_cpp_read_logical_line_trad (pfile))
 324     {
 325       size_t len = pfile->out.cur - pfile->out.base;
 326       maybe_print_line (pfile->out.first_line);
 327       fwrite (pfile->out.base, 1, len, print.outf);
 328       print.printed = true;
 329       if (!CPP_OPTION (pfile, discard_comments))
 330         account_for_newlines (pfile->out.base, len);
 331     }
 332 }
 333
 334 /* If the token read on logical line LINE needs to be output on a
 335    different line to the current one, output the required newlines or
 336    a line marker.  If a line marker was emitted, return TRUE otherwise
 337    return FALSE.  */
 338
 339 static bool
 340 maybe_print_line_1 (location_t src_loc, FILE *stream)
 341 {
 342   bool emitted_line_marker = false;
 343   int src_line = LOCATION_LINE (src_loc);
 344   const char *src_file = LOCATION_FILE (src_loc);
 345
 346   /* End the previous line of text.  */
 347   if (print.printed)
 348     {
 349       putc ('\n', stream);
 350       print.src_line++;
 351       print.printed = false;
 352     }
 353
 354   if (!flag_no_line_commands
 355       && src_line >= print.src_line
 356       && src_line < print.src_line + 8
 357       && strcmp (src_file, print.src_file) == 0)
 358     {
 359       while (src_line > print.src_line)
 360         {
 361           putc ('\n', stream);
 362           print.src_line++;
 363         }
 364     }
 365   else
 366     emitted_line_marker = print_line_1 (src_loc, "", stream);
 367
 368   return emitted_line_marker;
 369 }
 370
 371 /* If the token read on logical line LINE needs to be output on a
 372    different line to the current one, output the required newlines or
 373    a line marker.  If a line marker was emitted, return TRUE otherwise
 374    return FALSE.  */
 375
 376 static bool
 377 maybe_print_line (location_t src_loc)
 378 {
 379   if (cpp_get_options (parse_in)->debug)
 380     linemap_dump_location (line_table, src_loc,
 381                            print.outf);
 382   return maybe_print_line_1 (src_loc, print.outf);
 383 }
 384
 385 /* Output a line marker for logical line LINE.  Special flags are "1"
 386    or "2" indicating entering or leaving a file.  If the line marker
 387    was effectively emitted, return TRUE otherwise return FALSE.  */
 388
 389 static bool
 390 print_line_1 (location_t src_loc, const char *special_flags, FILE *stream)
 391 {
 392   bool emitted_line_marker = false;
 393
 394   /* End any previous line of text.  */
 395   if (print.printed)
 396     putc ('\n', stream);
 397   print.printed = false;
 398
 399   if (!flag_no_line_commands)
 400     {
 401       const char *file_path = LOCATION_FILE (src_loc);
 402       int sysp;
 403       size_t to_file_len = strlen (file_path);
 404       unsigned char *to_file_quoted =
 405          (unsigned char *) alloca (to_file_len * 4 + 1);
 406       unsigned char *p;
 407
 408       print.src_line = LOCATION_LINE (src_loc);
 409       print.src_file = file_path;
 410
 411       /* cpp_quote_string does not nul-terminate, so we have to do it
 412          ourselves.  */
 413       p = cpp_quote_string (to_file_quoted,
 414                             (const unsigned char *) file_path,
 415                             to_file_len);
 416       *p = '\0';
 417       fprintf (stream, "# %u \"%s\"%s",
 418                print.src_line == 0 ? 1 : print.src_line,
 419                to_file_quoted, special_flags);
 420
 421       sysp = in_system_header_at (src_loc);
 422       if (sysp == 2)
 423         fputs (" 3 4", stream);
 424       else if (sysp == 1)
 425         fputs (" 3", stream);
 426
 427       putc ('\n', stream);
 428       emitted_line_marker = true;
 429     }
 430
 431   return emitted_line_marker;
 432 }
 433
 434 /* Output a line marker for logical line LINE.  Special flags are "1"
 435    or "2" indicating entering or leaving a file.  Return TRUE if a
 436    line marker was effectively emitted, FALSE otherwise.  */
 437
 438 static bool
 439 print_line (location_t src_loc, const char *special_flags)
 440 {
 441     if (cpp_get_options (parse_in)->debug)
 442       linemap_dump_location (line_table, src_loc,
 443                              print.outf);
 444     return print_line_1 (src_loc, special_flags, print.outf);
 445 }
 446
 447 /* Helper function for cb_line_change and scan_translation_unit.
 448    Return TRUE if a line marker is emitted, FALSE otherwise.  */
 449 static bool
 450 do_line_change (cpp_reader *pfile, const cpp_token *token,
 451                 location_t src_loc, int parsing_args)
 452 {
 453   bool emitted_line_marker = false;
 454   if (define_queue || undef_queue)
 455     dump_queued_macros (pfile);
 456
 457   if (token->type == CPP_EOF || parsing_args)
 458     return false;
 459
 460   emitted_line_marker = maybe_print_line (src_loc);
 461   print.prev = 0;
 462   print.source = 0;
 463
 464   /* Supply enough spaces to put this token in its original column,
 465      one space per column greater than 2, since scan_translation_unit
 466      will provide a space if PREV_WHITE.  Don't bother trying to
 467      reconstruct tabs; we can't get it right in general, and nothing
 468      ought to care.  Some things do care; the fault lies with them.  */
 469   if (!CPP_OPTION (pfile, traditional))
 470     {
 471       int spaces = LOCATION_COLUMN (src_loc) - 2;
 472       print.printed = true;
 473
 474       while (-- spaces >= 0)
 475         putc (' ', print.outf);
 476     }
 477
 478   return emitted_line_marker;
 479 }
 480
 481 /* Called when a line of output is started.  TOKEN is the first token
 482    of the line, and at end of file will be CPP_EOF.  */
 483 static void
 484 cb_line_change (cpp_reader *pfile, const cpp_token *token,
 485                 int parsing_args)
 486 {
 487   do_line_change (pfile, token, token->src_loc, parsing_args);
 488 }
 489
 490 static void
 491 cb_ident (cpp_reader *pfile ATTRIBUTE_UNUSED, location_t line,
 492           const cpp_string *str)
 493 {
 494   maybe_print_line (line);
 495   fprintf (print.outf, "#ident %s\n", str->text);
 496   print.src_line++;
 497 }
 498
 499 static void
 500 cb_define (cpp_reader *pfile, location_t line, cpp_hashnode *node)
 501 {
 502   const line_map_ordinary *map;
 503
 504   maybe_print_line (line);
 505   fputs ("#define ", print.outf);
 506
 507   /* 'D' is whole definition; 'N' is name only.  */
 508   if (flag_dump_macros == 'D')
 509     fputs ((const char *) cpp_macro_definition (pfile, node),
 510            print.outf);
 511   else
 512     fputs ((const char *) NODE_NAME (node), print.outf);
 513
 514   putc ('\n', print.outf);
 515   print.printed = false;
 516   linemap_resolve_location (line_table, line,
 517                             LRK_MACRO_DEFINITION_LOCATION,
 518                             &map);
 519   if (LINEMAP_LINE (map) != 0)
 520     print.src_line++;
 521 }
 522
 523 static void
 524 cb_undef (cpp_reader *pfile ATTRIBUTE_UNUSED, location_t line,
 525           cpp_hashnode *node)
 526 {
 527   maybe_print_line (line);
 528   fprintf (print.outf, "#undef %s\n", NODE_NAME (node));
 529   print.src_line++;
 530 }
 531
 532 static void
 533 cb_used_define (cpp_reader *pfile, location_t line ATTRIBUTE_UNUSED,
 534                 cpp_hashnode *node)
 535 {
 536   if (cpp_user_macro_p (node))
 537     {
 538       macro_queue *q;
 539       q = XNEW (macro_queue);
 540       q->macro = xstrdup ((const char *) cpp_macro_definition (pfile, node));
 541       q->next = define_queue;
 542       define_queue = q;
 543     }
 544 }
 545
 546 static void
 547 cb_used_undef (cpp_reader *pfile ATTRIBUTE_UNUSED,
 548                location_t line ATTRIBUTE_UNUSED,
 549                cpp_hashnode *node)
 550 {
 551   macro_queue *q;
 552   q = XNEW (macro_queue);
 553   q->macro = xstrdup ((const char *) NODE_NAME (node));
 554   q->next = undef_queue;
 555   undef_queue = q;
 556 }
 557
 558 static void
 559 dump_queued_macros (cpp_reader *pfile ATTRIBUTE_UNUSED)
 560 {
 561   macro_queue *q;
 562
 563   /* End the previous line of text.  */
 564   if (print.printed)
 565     {
 566       putc ('\n', print.outf);
 567       print.src_line++;
 568       print.printed = false;
 569     }
 570
 571   for (q = define_queue; q;)
 572     {
 573       macro_queue *oq;
 574       fputs ("#define ", print.outf);
 575       fputs (q->macro, print.outf);
 576       putc ('\n', print.outf);
 577       print.printed = false;
 578       print.src_line++;
 579       oq = q;
 580       q = q->next;
 581       free (oq->macro);
 582       free (oq);
 583     }
 584   define_queue = NULL;
 585   for (q = undef_queue; q;)
 586     {
 587       macro_queue *oq;
 588       fprintf (print.outf, "#undef %s\n", q->macro);
 589       print.src_line++;
 590       oq = q;
 591       q = q->next;
 592       free (oq->macro);
 593       free (oq);
 594     }
 595   undef_queue = NULL;
 596 }
 597
 598 static void
 599 cb_include (cpp_reader *pfile ATTRIBUTE_UNUSED, location_t line,
 600             const unsigned char *dir, const char *header, int angle_brackets,
 601             const cpp_token **comments)
 602 {
 603   maybe_print_line (line);
 604   if (angle_brackets)
 605     fprintf (print.outf, "#%s <%s>", dir, header);
 606   else
 607     fprintf (print.outf, "#%s \"%s\"", dir, header);
 608
 609   if (comments != NULL)
 610     {
 611       while (*comments != NULL)
 612         {
 613           if ((*comments)->flags & PREV_WHITE)
 614             putc (' ', print.outf);
 615           cpp_output_token (*comments, print.outf);
 616           ++comments;
 617         }
 618     }
 619
 620   putc ('\n', print.outf);
 621   print.printed = false;
 622   print.src_line++;
 623 }
 624
 625 /* Callback called when -fworking-director and -E to emit working
 626    directory in cpp output file.  */
 627
 628 void
 629 pp_dir_change (cpp_reader *pfile ATTRIBUTE_UNUSED, const char *dir)
 630 {
 631   size_t to_file_len = strlen (dir);
 632   unsigned char *to_file_quoted =
 633      (unsigned char *) alloca (to_file_len * 4 + 1);
 634   unsigned char *p;
 635
 636   /* cpp_quote_string does not nul-terminate, so we have to do it ourselves.  */
 637   p = cpp_quote_string (to_file_quoted, (const unsigned char *) dir, to_file_len);
 638   *p = '\0';
 639   fprintf (print.outf, "# 1 \"%s//\"\n", to_file_quoted);
 640 }
 641
 642 /* The file name, line number or system header flags have changed, as
 643    described in MAP.  */
 644
 645 void
 646 pp_file_change (const line_map_ordinary *map)
 647 {
 648   const char *flags = "";
 649
 650   if (flag_no_line_commands)
 651     return;
 652
 653   if (map != NULL)
 654     {
 655       input_location = map->start_location;
 656       if (print.first_time)
 657         {
 658           /* Avoid printing foo.i when the main file is foo.c.  */
 659           if (!cpp_get_options (parse_in)->preprocessed)
 660             print_line (map->start_location, flags);
 661           print.first_time = 0;
 662         }
 663       else
 664         {
 665           /* Bring current file to correct line when entering a new file.  */
 666           if (map->reason == LC_ENTER)
 667             {
 668               maybe_print_line (linemap_included_from (map));
 669               flags = " 1";
 670             }
 671           else if (map->reason == LC_LEAVE)
 672             flags = " 2";
 673           print_line (map->start_location, flags);
 674         }
 675     }
 676 }
 677
 678 /* Copy a #pragma directive to the preprocessed output.  */
 679 static void
 680 cb_def_pragma (cpp_reader *pfile, location_t line)
 681 {
 682   maybe_print_line (line);
 683   fputs ("#pragma ", print.outf);
 684   cpp_output_line (pfile, print.outf);
 685   print.printed = false;
 686   print.src_line++;
 687 }
 688
 689 /* Dump out the hash table.  */
 690 static int
 691 dump_macro (cpp_reader *pfile, cpp_hashnode *node, void *v ATTRIBUTE_UNUSED)
 692 {
 693   if (cpp_user_macro_p (node))
 694     {
 695       fputs ("#define ", print.outf);
 696       fputs ((const char *) cpp_macro_definition (pfile, node),
 697              print.outf);
 698       putc ('\n', print.outf);
 699       print.printed = false;
 700       print.src_line++;
 701     }
 702
 703   return 1;
 704 }
 705
 706 /* Load in the PCH file NAME, open on FD.  It was originally searched for
 707    by ORIG_NAME.  Also, print out a #include command so that the PCH
 708    file can be loaded when the preprocessed output is compiled.  */
 709
 710 static void
 711 cb_read_pch (cpp_reader *pfile, const char *name,
 712              int fd, const char *orig_name ATTRIBUTE_UNUSED)
 713 {
 714   c_common_read_pch (pfile, name, fd, orig_name);
 715
 716   fprintf (print.outf, "#pragma GCC pch_preprocess \"%s\"\n", name);
 717   print.src_line++;
 718 }