gcc/c-family/c-ppoutput.c

   1 /* Preprocess only, using cpplib.
   2    Copyright (C) 1995-2016 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
 154   /* Initialize the print structure.  */
 155   print.src_line = 1;
 156   print.printed = false;
 157   print.prev = 0;
 158   print.outf = out_stream;
 159   print.first_time = 1;
 160   print.src_file = "";
 161   print.prev_was_system_token = false;
 162 }
 163
 164 /* Writes out the preprocessed file, handling spacing and paste
 165    avoidance issues.  */
 166 static void
 167 scan_translation_unit (cpp_reader *pfile)
 168 {
 169   bool avoid_paste = false;
 170   bool do_line_adjustments
 171     = cpp_get_options (parse_in)->lang != CLK_ASM
 172       && !flag_no_line_commands;
 173   bool in_pragma = false;
 174   bool line_marker_emitted = false;
 175
 176   print.source = NULL;
 177   for (;;)
 178     {
 179       source_location loc;
 180       const cpp_token *token = cpp_get_token_with_location (pfile, &loc);
 181
 182       if (token->type == CPP_PADDING)
 183         {
 184           avoid_paste = true;
 185           if (print.source == NULL
 186               || (!(print.source->flags & PREV_WHITE)
 187                   && token->val.source == NULL))
 188             print.source = token->val.source;
 189           continue;
 190         }
 191
 192       if (token->type == CPP_EOF)
 193         break;
 194
 195       /* Subtle logic to output a space if and only if necessary.  */
 196       if (avoid_paste)
 197         {
 198           int src_line = LOCATION_LINE (loc);
 199
 200           if (print.source == NULL)
 201             print.source = token;
 202
 203           if (src_line != print.src_line
 204               && do_line_adjustments
 205               && !in_pragma)
 206             {
 207               line_marker_emitted = do_line_change (pfile, token, loc, false);
 208               putc (' ', print.outf);
 209               print.printed = true;
 210             }
 211           else if (print.source->flags & PREV_WHITE
 212                    || (print.prev
 213                        && cpp_avoid_paste (pfile, print.prev, token))
 214                    || (print.prev == NULL && token->type == CPP_HASH))
 215             {
 216               putc (' ', print.outf);
 217               print.printed = true;
 218             }
 219         }
 220       else if (token->flags & PREV_WHITE)
 221         {
 222           int src_line = LOCATION_LINE (loc);
 223
 224           if (src_line != print.src_line
 225               && do_line_adjustments
 226               && !in_pragma)
 227             line_marker_emitted = do_line_change (pfile, token, loc, false);
 228           putc (' ', print.outf);
 229           print.printed = true;
 230         }
 231
 232       avoid_paste = false;
 233       print.source = NULL;
 234       print.prev = token;
 235       if (token->type == CPP_PRAGMA)
 236         {
 237           const char *space;
 238           const char *name;
 239
 240           line_marker_emitted = maybe_print_line (token->src_loc);
 241           fputs ("#pragma ", print.outf);
 242           c_pp_lookup_pragma (token->val.pragma, &space, &name);
 243           if (space)
 244             fprintf (print.outf, "%s %s", space, name);
 245           else
 246             fprintf (print.outf, "%s", name);
 247           print.printed = true;
 248           in_pragma = true;
 249         }
 250       else if (token->type == CPP_PRAGMA_EOL)
 251         {
 252           maybe_print_line (token->src_loc);
 253           in_pragma = false;
 254         }
 255       else
 256         {
 257           if (cpp_get_options (parse_in)->debug)
 258             linemap_dump_location (line_table, token->src_loc, print.outf);
 259
 260           if (do_line_adjustments
 261               && !in_pragma
 262               && !line_marker_emitted
 263               && print.prev_was_system_token != !!in_system_header_at (loc)
 264               && !is_location_from_builtin_token (loc))
 265             /* The system-ness of this token is different from the one
 266                of the previous token.  Let's emit a line change to
 267                mark the new system-ness before we emit the token.  */
 268             {
 269               do_line_change (pfile, token, loc, false);
 270               print.prev_was_system_token = !!in_system_header_at (loc);
 271             }
 272           cpp_output_token (token, print.outf);
 273           line_marker_emitted = false;
 274           print.printed = true;
 275         }
 276
 277       /* CPP_COMMENT tokens and raw-string literal tokens can
 278          have embedded new-line characters.  Rather than enumerating
 279          all the possible token types just check if token uses
 280          val.str union member.  */
 281       if (cpp_token_val_index (token) == CPP_TOKEN_FLD_STR)
 282         account_for_newlines (token->val.str.text, token->val.str.len);
 283     }
 284 }
 285
 286 static void
 287 print_lines_directives_only (int lines, const void *buf, size_t size)
 288 {
 289   print.src_line += lines;
 290   fwrite (buf, 1, size, print.outf);
 291 }
 292
 293 /* Writes out the preprocessed file, handling spacing and paste
 294    avoidance issues.  */
 295 static void
 296 scan_translation_unit_directives_only (cpp_reader *pfile)
 297 {
 298   struct _cpp_dir_only_callbacks cb;
 299
 300   cb.print_lines = print_lines_directives_only;
 301   cb.maybe_print_line = (void (*) (source_location)) maybe_print_line;
 302
 303   _cpp_preprocess_dir_only (pfile, &cb);
 304 }
 305
 306 /* Adjust print.src_line for newlines embedded in output.  */
 307 static void
 308 account_for_newlines (const unsigned char *str, size_t len)
 309 {
 310   while (len--)
 311     if (*str++ == '\n')
 312       print.src_line++;
 313 }
 314
 315 /* Writes out a traditionally preprocessed file.  */
 316 static void
 317 scan_translation_unit_trad (cpp_reader *pfile)
 318 {
 319   while (_cpp_read_logical_line_trad (pfile))
 320     {
 321       size_t len = pfile->out.cur - pfile->out.base;
 322       maybe_print_line (pfile->out.first_line);
 323       fwrite (pfile->out.base, 1, len, print.outf);
 324       print.printed = true;
 325       if (!CPP_OPTION (pfile, discard_comments))
 326         account_for_newlines (pfile->out.base, len);
 327     }
 328 }
 329
 330 /* If the token read on logical line LINE needs to be output on a
 331    different line to the current one, output the required newlines or
 332    a line marker.  If a line marker was emitted, return TRUE otherwise
 333    return FALSE.  */
 334
 335 static bool
 336 maybe_print_line_1 (source_location src_loc, FILE *stream)
 337 {
 338   bool emitted_line_marker = false;
 339   int src_line = LOCATION_LINE (src_loc);
 340   const char *src_file = LOCATION_FILE (src_loc);
 341
 342   /* End the previous line of text.  */
 343   if (print.printed)
 344     {
 345       putc ('\n', stream);
 346       print.src_line++;
 347       print.printed = false;
 348     }
 349
 350   if (!flag_no_line_commands
 351       && src_line >= print.src_line
 352       && src_line < print.src_line + 8
 353       && strcmp (src_file, print.src_file) == 0)
 354     {
 355       while (src_line > print.src_line)
 356         {
 357           putc ('\n', stream);
 358           print.src_line++;
 359         }
 360     }
 361   else
 362     emitted_line_marker = print_line_1 (src_loc, "", stream);
 363
 364   return emitted_line_marker;
 365 }
 366
 367 /* If the token read on logical line LINE needs to be output on a
 368    different line to the current one, output the required newlines or
 369    a line marker.  If a line marker was emitted, return TRUE otherwise
 370    return FALSE.  */
 371
 372 static bool
 373 maybe_print_line (source_location src_loc)
 374 {
 375   if (cpp_get_options (parse_in)->debug)
 376     linemap_dump_location (line_table, src_loc,
 377                            print.outf);
 378   return maybe_print_line_1 (src_loc, print.outf);
 379 }
 380
 381 /* Output a line marker for logical line LINE.  Special flags are "1"
 382    or "2" indicating entering or leaving a file.  If the line marker
 383    was effectively emitted, return TRUE otherwise return FALSE.  */
 384
 385 static bool
 386 print_line_1 (source_location src_loc, const char *special_flags, FILE *stream)
 387 {
 388   bool emitted_line_marker = false;
 389
 390   /* End any previous line of text.  */
 391   if (print.printed)
 392     putc ('\n', stream);
 393   print.printed = false;
 394
 395   if (!flag_no_line_commands)
 396     {
 397       const char *file_path = LOCATION_FILE (src_loc);
 398       int sysp;
 399       size_t to_file_len = strlen (file_path);
 400       unsigned char *to_file_quoted =
 401          (unsigned char *) alloca (to_file_len * 4 + 1);
 402       unsigned char *p;
 403
 404       print.src_line = LOCATION_LINE (src_loc);
 405       print.src_file = file_path;
 406
 407       /* cpp_quote_string does not nul-terminate, so we have to do it
 408          ourselves.  */
 409       p = cpp_quote_string (to_file_quoted,
 410                             (const unsigned char *) file_path,
 411                             to_file_len);
 412       *p = '\0';
 413       fprintf (stream, "# %u \"%s\"%s",
 414                print.src_line == 0 ? 1 : print.src_line,
 415                to_file_quoted, special_flags);
 416
 417       sysp = in_system_header_at (src_loc);
 418       if (sysp == 2)
 419         fputs (" 3 4", stream);
 420       else if (sysp == 1)
 421         fputs (" 3", stream);
 422
 423       putc ('\n', stream);
 424       emitted_line_marker = true;
 425     }
 426
 427   return emitted_line_marker;
 428 }
 429
 430 /* Output a line marker for logical line LINE.  Special flags are "1"
 431    or "2" indicating entering or leaving a file.  Return TRUE if a
 432    line marker was effectively emitted, FALSE otherwise.  */
 433
 434 static bool
 435 print_line (source_location src_loc, const char *special_flags)
 436 {
 437     if (cpp_get_options (parse_in)->debug)
 438       linemap_dump_location (line_table, src_loc,
 439                              print.outf);
 440     return print_line_1 (src_loc, special_flags, print.outf);
 441 }
 442
 443 /* Helper function for cb_line_change and scan_translation_unit.
 444    Return TRUE if a line marker is emitted, FALSE otherwise.  */
 445 static bool
 446 do_line_change (cpp_reader *pfile, const cpp_token *token,
 447                 source_location src_loc, int parsing_args)
 448 {
 449   bool emitted_line_marker = false;
 450   if (define_queue || undef_queue)
 451     dump_queued_macros (pfile);
 452
 453   if (token->type == CPP_EOF || parsing_args)
 454     return false;
 455
 456   emitted_line_marker = maybe_print_line (src_loc);
 457   print.prev = 0;
 458   print.source = 0;
 459
 460   /* Supply enough spaces to put this token in its original column,
 461      one space per column greater than 2, since scan_translation_unit
 462      will provide a space if PREV_WHITE.  Don't bother trying to
 463      reconstruct tabs; we can't get it right in general, and nothing
 464      ought to care.  Some things do care; the fault lies with them.  */
 465   if (!CPP_OPTION (pfile, traditional))
 466     {
 467       int spaces = LOCATION_COLUMN (src_loc) - 2;
 468       print.printed = true;
 469
 470       while (-- spaces >= 0)
 471         putc (' ', print.outf);
 472     }
 473
 474   return emitted_line_marker;
 475 }
 476
 477 /* Called when a line of output is started.  TOKEN is the first token
 478    of the line, and at end of file will be CPP_EOF.  */
 479 static void
 480 cb_line_change (cpp_reader *pfile, const cpp_token *token,
 481                 int parsing_args)
 482 {
 483   do_line_change (pfile, token, token->src_loc, parsing_args);
 484 }
 485
 486 static void
 487 cb_ident (cpp_reader *pfile ATTRIBUTE_UNUSED, source_location line,
 488           const cpp_string *str)
 489 {
 490   maybe_print_line (line);
 491   fprintf (print.outf, "#ident %s\n", str->text);
 492   print.src_line++;
 493 }
 494
 495 static void
 496 cb_define (cpp_reader *pfile, source_location line, cpp_hashnode *node)
 497 {
 498   const line_map_ordinary *map;
 499
 500   maybe_print_line (line);
 501   fputs ("#define ", print.outf);
 502
 503   /* 'D' is whole definition; 'N' is name only.  */
 504   if (flag_dump_macros == 'D')
 505     fputs ((const char *) cpp_macro_definition (pfile, node),
 506            print.outf);
 507   else
 508     fputs ((const char *) NODE_NAME (node), print.outf);
 509
 510   putc ('\n', print.outf);
 511   print.printed = false;
 512   linemap_resolve_location (line_table, line,
 513                             LRK_MACRO_DEFINITION_LOCATION,
 514                             &map);
 515   if (LINEMAP_LINE (map) != 0)
 516     print.src_line++;
 517 }
 518
 519 static void
 520 cb_undef (cpp_reader *pfile ATTRIBUTE_UNUSED, source_location line,
 521           cpp_hashnode *node)
 522 {
 523   maybe_print_line (line);
 524   fprintf (print.outf, "#undef %s\n", NODE_NAME (node));
 525   print.src_line++;
 526 }
 527
 528 static void
 529 cb_used_define (cpp_reader *pfile, source_location line ATTRIBUTE_UNUSED,
 530                 cpp_hashnode *node)
 531 {
 532   macro_queue *q;
 533   if (node->flags & NODE_BUILTIN)
 534     return;
 535   q = XNEW (macro_queue);
 536   q->macro = xstrdup ((const char *) cpp_macro_definition (pfile, node));
 537   q->next = define_queue;
 538   define_queue = q;
 539 }
 540
 541 static void
 542 cb_used_undef (cpp_reader *pfile ATTRIBUTE_UNUSED,
 543                source_location line ATTRIBUTE_UNUSED,
 544                cpp_hashnode *node)
 545 {
 546   macro_queue *q;
 547   q = XNEW (macro_queue);
 548   q->macro = xstrdup ((const char *) NODE_NAME (node));
 549   q->next = undef_queue;
 550   undef_queue = q;
 551 }
 552
 553 static void
 554 dump_queued_macros (cpp_reader *pfile ATTRIBUTE_UNUSED)
 555 {
 556   macro_queue *q;
 557
 558   /* End the previous line of text.  */
 559   if (print.printed)
 560     {
 561       putc ('\n', print.outf);
 562       print.src_line++;
 563       print.printed = false;
 564     }
 565
 566   for (q = define_queue; q;)
 567     {
 568       macro_queue *oq;
 569       fputs ("#define ", print.outf);
 570       fputs (q->macro, print.outf);
 571       putc ('\n', print.outf);
 572       print.printed = false;
 573       print.src_line++;
 574       oq = q;
 575       q = q->next;
 576       free (oq->macro);
 577       free (oq);
 578     }
 579   define_queue = NULL;
 580   for (q = undef_queue; q;)
 581     {
 582       macro_queue *oq;
 583       fprintf (print.outf, "#undef %s\n", q->macro);
 584       print.src_line++;
 585       oq = q;
 586       q = q->next;
 587       free (oq->macro);
 588       free (oq);
 589     }
 590   undef_queue = NULL;
 591 }
 592
 593 static void
 594 cb_include (cpp_reader *pfile ATTRIBUTE_UNUSED, source_location line,
 595             const unsigned char *dir, const char *header, int angle_brackets,
 596             const cpp_token **comments)
 597 {
 598   maybe_print_line (line);
 599   if (angle_brackets)
 600     fprintf (print.outf, "#%s <%s>", dir, header);
 601   else
 602     fprintf (print.outf, "#%s \"%s\"", dir, header);
 603
 604   if (comments != NULL)
 605     {
 606       while (*comments != NULL)
 607         {
 608           if ((*comments)->flags & PREV_WHITE)
 609             putc (' ', print.outf);
 610           cpp_output_token (*comments, print.outf);
 611           ++comments;
 612         }
 613     }
 614
 615   putc ('\n', print.outf);
 616   print.printed = false;
 617   print.src_line++;
 618 }
 619
 620 /* Callback called when -fworking-director and -E to emit working
 621    directory in cpp output file.  */
 622
 623 void
 624 pp_dir_change (cpp_reader *pfile ATTRIBUTE_UNUSED, const char *dir)
 625 {
 626   size_t to_file_len = strlen (dir);
 627   unsigned char *to_file_quoted =
 628      (unsigned char *) alloca (to_file_len * 4 + 1);
 629   unsigned char *p;
 630
 631   /* cpp_quote_string does not nul-terminate, so we have to do it ourselves.  */
 632   p = cpp_quote_string (to_file_quoted, (const unsigned char *) dir, to_file_len);
 633   *p = '\0';
 634   fprintf (print.outf, "# 1 \"%s//\"\n", to_file_quoted);
 635 }
 636
 637 /* The file name, line number or system header flags have changed, as
 638    described in MAP.  */
 639
 640 void
 641 pp_file_change (const line_map_ordinary *map)
 642 {
 643   const char *flags = "";
 644
 645   if (flag_no_line_commands)
 646     return;
 647
 648   if (map != NULL)
 649     {
 650       input_location = map->start_location;
 651       if (print.first_time)
 652         {
 653           /* Avoid printing foo.i when the main file is foo.c.  */
 654           if (!cpp_get_options (parse_in)->preprocessed)
 655             print_line (map->start_location, flags);
 656           print.first_time = 0;
 657         }
 658       else
 659         {
 660           /* Bring current file to correct line when entering a new file.  */
 661           if (map->reason == LC_ENTER)
 662             {
 663               const line_map_ordinary *from = INCLUDED_FROM (line_table, map);
 664               maybe_print_line (LAST_SOURCE_LINE_LOCATION (from));
 665             }
 666           if (map->reason == LC_ENTER)
 667             flags = " 1";
 668           else if (map->reason == LC_LEAVE)
 669             flags = " 2";
 670           print_line (map->start_location, flags);
 671         }
 672     }
 673 }
 674
 675 /* Copy a #pragma directive to the preprocessed output.  */
 676 static void
 677 cb_def_pragma (cpp_reader *pfile, source_location line)
 678 {
 679   maybe_print_line (line);
 680   fputs ("#pragma ", print.outf);
 681   cpp_output_line (pfile, print.outf);
 682   print.printed = false;
 683   print.src_line++;
 684 }
 685
 686 /* Dump out the hash table.  */
 687 static int
 688 dump_macro (cpp_reader *pfile, cpp_hashnode *node, void *v ATTRIBUTE_UNUSED)
 689 {
 690   if (node->type == NT_MACRO && !(node->flags & NODE_BUILTIN))
 691     {
 692       fputs ("#define ", print.outf);
 693       fputs ((const char *) cpp_macro_definition (pfile, node),
 694              print.outf);
 695       putc ('\n', print.outf);
 696       print.printed = false;
 697       print.src_line++;
 698     }
 699
 700   return 1;
 701 }
 702
 703 /* Load in the PCH file NAME, open on FD.  It was originally searched for
 704    by ORIG_NAME.  Also, print out a #include command so that the PCH
 705    file can be loaded when the preprocessed output is compiled.  */
 706
 707 static void
 708 cb_read_pch (cpp_reader *pfile, const char *name,
 709              int fd, const char *orig_name ATTRIBUTE_UNUSED)
 710 {
 711   c_common_read_pch (pfile, name, fd, orig_name);
 712
 713   fprintf (print.outf, "#pragma GCC pch_preprocess \"%s\"\n", name);
 714   print.src_line++;
 715 }