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
preprocess_file(cpp_reader * pfile)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
init_pp_output(FILE * out_stream)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
scan_translation_unit(cpp_reader * pfile)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
print_lines_directives_only(int lines,const void * buf,size_t size)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
scan_translation_unit_directives_only(cpp_reader * pfile)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
account_for_newlines(const unsigned char * str,size_t len)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
scan_translation_unit_trad(cpp_reader * pfile)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
maybe_print_line_1(location_t src_loc,FILE * stream)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
maybe_print_line(location_t src_loc)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
print_line_1(location_t src_loc,const char * special_flags,FILE * stream)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
print_line(location_t src_loc,const char * special_flags)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
do_line_change(cpp_reader * pfile,const cpp_token * token,location_t src_loc,int parsing_args)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
cb_line_change(cpp_reader * pfile,const cpp_token * token,int parsing_args)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
cb_ident(cpp_reader * pfile ATTRIBUTE_UNUSED,location_t line,const cpp_string * str)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
cb_define(cpp_reader * pfile,location_t line,cpp_hashnode * node)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
cb_undef(cpp_reader * pfile ATTRIBUTE_UNUSED,location_t line,cpp_hashnode * node)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
cb_used_define(cpp_reader * pfile,location_t line ATTRIBUTE_UNUSED,cpp_hashnode * node)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
cb_used_undef(cpp_reader * pfile ATTRIBUTE_UNUSED,location_t line ATTRIBUTE_UNUSED,cpp_hashnode * node)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
dump_queued_macros(cpp_reader * pfile ATTRIBUTE_UNUSED)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
cb_include(cpp_reader * pfile ATTRIBUTE_UNUSED,location_t line,const unsigned char * dir,const char * header,int angle_brackets,const cpp_token ** comments)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
pp_dir_change(cpp_reader * pfile ATTRIBUTE_UNUSED,const char * dir)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
pp_file_change(const line_map_ordinary * map)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
cb_def_pragma(cpp_reader * pfile,location_t line)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
dump_macro(cpp_reader * pfile,cpp_hashnode * node,void * v ATTRIBUTE_UNUSED)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
cb_read_pch(cpp_reader * pfile,const char * name,int fd,const char * orig_name ATTRIBUTE_UNUSED)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 }
719