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8f9b4009 | 1 | /* Part of CPP library. File handling. |
83ffe9cd | 2 | Copyright (C) 1986-2023 Free Software Foundation, Inc. |
add7091b ZW |
3 | Written by Per Bothner, 1994. |
4 | Based on CCCP program by Paul Rubin, June 1986 | |
5 | Adapted to ANSI C, Richard Stallman, Jan 1987 | |
6 | Split out of cpplib.c, Zack Weinberg, Oct 1998 | |
8f9b4009 | 7 | Reimplemented, Neil Booth, Jul 2003 |
add7091b ZW |
8 | |
9 | This program is free software; you can redistribute it and/or modify it | |
10 | under the terms of the GNU General Public License as published by the | |
748086b7 | 11 | Free Software Foundation; either version 3, or (at your option) any |
add7091b ZW |
12 | later version. |
13 | ||
14 | This program is distributed in the hope that it will be useful, | |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
748086b7 JJ |
20 | along with this program; see the file COPYING3. If not see |
21 | <http://www.gnu.org/licenses/>. */ | |
add7091b ZW |
22 | |
23 | #include "config.h" | |
24 | #include "system.h" | |
add7091b | 25 | #include "cpplib.h" |
4f4e53dd | 26 | #include "internal.h" |
168d3732 | 27 | #include "mkdeps.h" |
0b4cafec | 28 | #include "obstack.h" |
bf42e45b | 29 | #include "hashtab.h" |
73e61092 | 30 | #include "md5.h" |
8f9b4009 | 31 | #include <dirent.h> |
f8f769ea | 32 | |
8f9b4009 NB |
33 | /* Variable length record files on VMS will have a stat size that includes |
34 | record control characters that won't be included in the read size. */ | |
35 | #ifdef VMS | |
36 | # define FAB_C_VAR 2 /* variable length records (see Starlet fabdef.h) */ | |
37 | # define STAT_SIZE_RELIABLE(ST) ((ST).st_fab_rfm != FAB_C_VAR) | |
38 | #else | |
39 | # define STAT_SIZE_RELIABLE(ST) true | |
d7a2e0f7 ZW |
40 | #endif |
41 | ||
8f9b4009 | 42 | #ifdef __DJGPP__ |
473c5bc9 | 43 | #include <io.h> |
8f9b4009 NB |
44 | /* For DJGPP redirected input is opened in text mode. */ |
45 | # define set_stdin_to_binary_mode() \ | |
46 | if (! isatty (0)) setmode (0, O_BINARY) | |
47 | #else | |
48 | # define set_stdin_to_binary_mode() /* Nothing */ | |
49 | #endif | |
50 | ||
8f9b4009 NB |
51 | /* This structure represents a file searched for by CPP, whether it |
52 | exists or not. An instance may be pointed to by more than one | |
d87fc699 | 53 | cpp_file_hash_entry; at present no reference count is kept. */ |
8f9b4009 NB |
54 | struct _cpp_file |
55 | { | |
56 | /* Filename as given to #include or command line switch. */ | |
57 | const char *name; | |
642ce434 | 58 | |
8f9b4009 NB |
59 | /* The full path used to find the file. */ |
60 | const char *path; | |
ae1139f9 | 61 | |
8f9b4009 NB |
62 | /* The full path of the pch file. */ |
63 | const char *pchname; | |
add7091b | 64 | |
bf42e45b NB |
65 | /* The file's path with the basename stripped. NULL if it hasn't |
66 | been calculated yet. */ | |
8f9b4009 | 67 | const char *dir_name; |
c71f835b | 68 | |
49634b3a NB |
69 | /* Chain through all files. */ |
70 | struct _cpp_file *next_file; | |
a36c54fa | 71 | |
8f9b4009 NB |
72 | /* The contents of NAME after calling read_file(). */ |
73 | const uchar *buffer; | |
a36c54fa | 74 | |
688e7a53 TT |
75 | /* Pointer to the real start of BUFFER. read_file() might increment |
76 | BUFFER; when freeing, this this pointer must be used instead. */ | |
77 | const uchar *buffer_start; | |
78 | ||
8f9b4009 NB |
79 | /* The macro, if any, preventing re-inclusion. */ |
80 | const cpp_hashnode *cmacro; | |
642ce434 | 81 | |
8f9b4009 NB |
82 | /* The directory in the search path where FILE was found. Used for |
83 | #include_next and determining whether a header is a system | |
bf42e45b | 84 | header. */ |
8f9b4009 | 85 | cpp_dir *dir; |
a36c54fa | 86 | |
8f9b4009 NB |
87 | /* As filled in by stat(2) for the file. */ |
88 | struct stat st; | |
a36c54fa | 89 | |
8f9b4009 NB |
90 | /* File descriptor. Invalid if -1, otherwise open. */ |
91 | int fd; | |
d6d52dd6 | 92 | |
8f9b4009 NB |
93 | /* Zero if this file was successfully opened and stat()-ed, |
94 | otherwise errno obtained from failure. */ | |
95 | int err_no; | |
add7091b | 96 | |
8f9b4009 NB |
97 | /* Number of times the file has been stacked for preprocessing. */ |
98 | unsigned short stack_count; | |
2047e26f | 99 | |
49634b3a | 100 | /* If opened with #import or contains #pragma once. */ |
a0be978a | 101 | bool once_only : 1; |
add7091b | 102 | |
8f9b4009 | 103 | /* If read() failed before. */ |
a0be978a | 104 | bool dont_read : 1; |
add7091b | 105 | |
8f9b4009 | 106 | /* If BUFFER above contains the true contents of the file. */ |
a0be978a | 107 | bool buffer_valid : 1; |
1efcb8c6 JM |
108 | |
109 | /* If this file is implicitly preincluded. */ | |
a0be978a | 110 | bool implicit_preinclude : 1; |
7ceb899e NS |
111 | |
112 | /* > 0: Known C++ Module header unit, <0: known not. ==0, unknown */ | |
113 | int header_unit : 2; | |
8f9b4009 | 114 | }; |
d4506961 | 115 | |
8f9b4009 NB |
116 | /* A singly-linked list for all searches for a given file name, with |
117 | its head pointed to by a slot in FILE_HASH. The file name is what | |
118 | appeared between the quotes in a #include directive; it can be | |
a98ebe2e | 119 | determined implicitly from the hash table location or explicitly |
bf42e45b | 120 | from FILE->name. |
8f9b4009 NB |
121 | |
122 | FILE is a structure containing details about the file that was | |
123 | found with that search, or details of how the search failed. | |
124 | ||
125 | START_DIR is the starting location of the search in the include | |
126 | chain. The current directories for "" includes are also hashed in | |
bf42e45b NB |
127 | the hash table and therefore unique. Files that are looked up |
128 | without using a search path, such as absolute filenames and file | |
129 | names from the command line share a special starting directory so | |
130 | they don't cause cache hits with normal include-chain lookups. | |
8f9b4009 NB |
131 | |
132 | If START_DIR is NULL then the entry is for a directory, not a file, | |
133 | and the directory is in DIR. Since the starting point in a file | |
134 | lookup chain is never NULL, this means that simple pointer | |
135 | comparisons against START_DIR can be made to determine cache hits | |
136 | in file lookups. | |
bf42e45b NB |
137 | |
138 | If a cache lookup fails because of e.g. an extra "./" in the path, | |
139 | then nothing will break. It is just less efficient as CPP will | |
140 | have to do more work re-preprocessing the file, and/or comparing | |
141 | its contents against earlier once-only files. | |
8f9b4009 | 142 | */ |
d87fc699 | 143 | struct cpp_file_hash_entry |
8f9b4009 | 144 | { |
d87fc699 | 145 | struct cpp_file_hash_entry *next; |
8f9b4009 | 146 | cpp_dir *start_dir; |
620e594b | 147 | location_t location; |
8f9b4009 NB |
148 | union |
149 | { | |
150 | _cpp_file *file; | |
151 | cpp_dir *dir; | |
152 | } u; | |
153 | }; | |
154 | ||
d87fc699 | 155 | /* Number of entries to put in a cpp_file_hash_entry pool. */ |
97f6bd40 TT |
156 | #define FILE_HASH_POOL_SIZE 127 |
157 | ||
d87fc699 | 158 | /* A file hash entry pool. We allocate cpp_file_hash_entry object from |
97f6bd40 TT |
159 | one of these. */ |
160 | struct file_hash_entry_pool | |
161 | { | |
162 | /* Number of entries used from this pool. */ | |
163 | unsigned int file_hash_entries_used; | |
164 | /* Next pool in the chain; used when freeing. */ | |
165 | struct file_hash_entry_pool *next; | |
166 | /* The memory pool. */ | |
d87fc699 | 167 | struct cpp_file_hash_entry pool[FILE_HASH_POOL_SIZE]; |
97f6bd40 TT |
168 | }; |
169 | ||
8f9b4009 | 170 | static bool open_file (_cpp_file *file); |
3d67ba1e GK |
171 | static bool pch_open_file (cpp_reader *pfile, _cpp_file *file, |
172 | bool *invalid_pch); | |
173 | static bool find_file_in_dir (cpp_reader *pfile, _cpp_file *file, | |
620e594b | 174 | bool *invalid_pch, location_t loc); |
ac81cf0b | 175 | static bool read_file_guts (cpp_reader *pfile, _cpp_file *file, |
3ac6b5cf | 176 | location_t loc, const char *input_charset); |
ac81cf0b | 177 | static bool read_file (cpp_reader *pfile, _cpp_file *file, |
620e594b | 178 | location_t loc); |
8f9b4009 NB |
179 | static struct cpp_dir *search_path_head (cpp_reader *, const char *fname, |
180 | int angle_brackets, enum include_type); | |
181 | static const char *dir_name_of_file (_cpp_file *file); | |
ac81cf0b | 182 | static void open_file_failed (cpp_reader *pfile, _cpp_file *file, int, |
620e594b | 183 | location_t); |
d87fc699 | 184 | static struct cpp_file_hash_entry *search_cache (struct cpp_file_hash_entry *head, |
8f9b4009 | 185 | const cpp_dir *start_dir); |
bf425849 | 186 | static _cpp_file *make_cpp_file (cpp_dir *, const char *fname); |
1b449375 | 187 | static void destroy_cpp_file (_cpp_file *); |
8f9b4009 NB |
188 | static cpp_dir *make_cpp_dir (cpp_reader *, const char *dir_name, int sysp); |
189 | static void allocate_file_hash_entries (cpp_reader *pfile); | |
d87fc699 | 190 | static struct cpp_file_hash_entry *new_file_hash_entry (cpp_reader *pfile); |
8f9b4009 | 191 | static int report_missing_guard (void **slot, void *b); |
b92be669 PB |
192 | static hashval_t file_hash_hash (const void *p); |
193 | static int file_hash_eq (const void *p, const void *q); | |
8f9b4009 NB |
194 | static char *read_filename_string (int ch, FILE *f); |
195 | static void read_name_map (cpp_dir *dir); | |
196 | static char *remap_filename (cpp_reader *pfile, _cpp_file *file); | |
197 | static char *append_file_to_dir (const char *fname, cpp_dir *dir); | |
198 | static bool validate_pch (cpp_reader *, _cpp_file *file, const char *pchname); | |
73e61092 GK |
199 | static int pchf_save_compare (const void *e1, const void *e2); |
200 | static int pchf_compare (const void *d_p, const void *e_p); | |
201 | static bool check_file_against_entries (cpp_reader *, _cpp_file *, bool); | |
8f9b4009 NB |
202 | |
203 | /* Given a filename in FILE->PATH, with the empty string interpreted | |
204 | as <stdin>, open it. | |
205 | ||
206 | On success FILE contains an open file descriptor and stat | |
207 | information for the file. On failure the file descriptor is -1 and | |
208 | the appropriate errno is also stored in FILE. Returns TRUE iff | |
209 | successful. | |
210 | ||
211 | We used to open files in nonblocking mode, but that caused more | |
212 | problems than it solved. Do take care not to acquire a controlling | |
213 | terminal by mistake (this can't happen on sane systems, but | |
214 | paranoia is a virtue). | |
215 | ||
216 | Use the three-argument form of open even though we aren't | |
217 | specifying O_CREAT, to defend against broken system headers. | |
218 | ||
219 | O_BINARY tells some runtime libraries (notably DJGPP) not to do | |
220 | newline translation; we can handle DOS line breaks just fine | |
221 | ourselves. */ | |
222 | static bool | |
223 | open_file (_cpp_file *file) | |
224 | { | |
225 | if (file->path[0] == '\0') | |
85be8c2d AP |
226 | { |
227 | file->fd = 0; | |
8f9b4009 | 228 | set_stdin_to_binary_mode (); |
85be8c2d | 229 | } |
f2d5f0cc | 230 | else |
8f9b4009 | 231 | file->fd = open (file->path, O_RDONLY | O_NOCTTY | O_BINARY, 0666); |
a58d32c2 | 232 | |
8f9b4009 | 233 | if (file->fd != -1) |
2047e26f | 234 | { |
8f9b4009 NB |
235 | if (fstat (file->fd, &file->st) == 0) |
236 | { | |
237 | if (!S_ISDIR (file->st.st_mode)) | |
238 | { | |
239 | file->err_no = 0; | |
240 | return true; | |
241 | } | |
242 | ||
243 | /* Ignore a directory and continue the search. The file we're | |
244 | looking for may be elsewhere in the search path. */ | |
245 | errno = ENOENT; | |
246 | } | |
55485cd9 | 247 | |
55485cd9 ZW |
248 | close (file->fd); |
249 | file->fd = -1; | |
2047e26f | 250 | } |
84152c25 VP |
251 | #if defined(_WIN32) && !defined(__CYGWIN__) |
252 | else if (errno == EACCES) | |
253 | { | |
254 | /* On most UNIX systems, open succeeds on a directory. Above, | |
255 | we check if we have opened a directory and if so, set errno | |
256 | to ENOENT. However, on Windows, opening a directory | |
66938a1d | 257 | fails with EACCES. We want to return ENOENT in that |
84152c25 VP |
258 | case too. */ |
259 | if (stat (file->path, &file->st) == 0 | |
260 | && S_ISDIR (file->st.st_mode)) | |
261 | errno = ENOENT; | |
71995ede VP |
262 | else |
263 | /* The call to stat may have reset errno. */ | |
66938a1d | 264 | errno = EACCES; |
84152c25 VP |
265 | } |
266 | #endif | |
a54c550f NB |
267 | else if (errno == ENOTDIR) |
268 | errno = ENOENT; | |
a58d32c2 | 269 | |
f277b5e0 | 270 | file->err_no = errno; |
8f9b4009 NB |
271 | |
272 | return false; | |
a58d32c2 ZW |
273 | } |
274 | ||
3d67ba1e GK |
275 | /* Temporary PCH intercept of opening a file. Try to find a PCH file |
276 | based on FILE->name and FILE->dir, and test those found for | |
277 | validity using PFILE->cb.valid_pch. Return true iff a valid file is | |
278 | found. Set *INVALID_PCH if a PCH file is found but wasn't valid. */ | |
279 | ||
8f9b4009 | 280 | static bool |
3d67ba1e | 281 | pch_open_file (cpp_reader *pfile, _cpp_file *file, bool *invalid_pch) |
17211ab5 | 282 | { |
8f9b4009 NB |
283 | static const char extension[] = ".gch"; |
284 | const char *path = file->path; | |
285 | size_t len, flen; | |
286 | char *pchname; | |
287 | struct stat st; | |
288 | bool valid = false; | |
289 | ||
290 | /* No PCH on <stdin> or if not requested. */ | |
291 | if (file->name[0] == '\0' || !pfile->cb.valid_pch) | |
292 | return false; | |
17211ab5 | 293 | |
9a8a2b7a RG |
294 | /* If the file is not included as first include from either the toplevel |
295 | file or the command-line it is not a valid use of PCH. */ | |
ca708025 RB |
296 | for (_cpp_file *f = pfile->all_files; f; f = f->next_file) |
297 | if (f->implicit_preinclude) | |
298 | continue; | |
bf425849 | 299 | else if (pfile->main_file == f) |
ca708025 RB |
300 | break; |
301 | else | |
302 | return false; | |
9a8a2b7a | 303 | |
8f9b4009 NB |
304 | flen = strlen (path); |
305 | len = flen + sizeof (extension); | |
c3f829c1 | 306 | pchname = XNEWVEC (char, len); |
8f9b4009 NB |
307 | memcpy (pchname, path, flen); |
308 | memcpy (pchname + flen, extension, sizeof (extension)); | |
17211ab5 | 309 | |
8f9b4009 | 310 | if (stat (pchname, &st) == 0) |
17211ab5 | 311 | { |
8f9b4009 NB |
312 | DIR *pchdir; |
313 | struct dirent *d; | |
314 | size_t dlen, plen = len; | |
315 | ||
316 | if (!S_ISDIR (st.st_mode)) | |
317 | valid = validate_pch (pfile, file, pchname); | |
318 | else if ((pchdir = opendir (pchname)) != NULL) | |
17211ab5 | 319 | { |
8f9b4009 NB |
320 | pchname[plen - 1] = '/'; |
321 | while ((d = readdir (pchdir)) != NULL) | |
8d973a83 | 322 | { |
8f9b4009 | 323 | dlen = strlen (d->d_name) + 1; |
230fcd32 PE |
324 | if ((strcmp (d->d_name, ".") == 0) |
325 | || (strcmp (d->d_name, "..") == 0)) | |
326 | continue; | |
8f9b4009 | 327 | if (dlen + plen > len) |
17211ab5 | 328 | { |
8f9b4009 | 329 | len += dlen + 64; |
c3f829c1 | 330 | pchname = XRESIZEVEC (char, pchname, len); |
17211ab5 | 331 | } |
8f9b4009 NB |
332 | memcpy (pchname + plen, d->d_name, dlen); |
333 | valid = validate_pch (pfile, file, pchname); | |
334 | if (valid) | |
8d973a83 | 335 | break; |
17211ab5 | 336 | } |
8f9b4009 | 337 | closedir (pchdir); |
17211ab5 | 338 | } |
d4c32e1d | 339 | if (!valid) |
bcad4ca2 | 340 | *invalid_pch = true; |
17211ab5 | 341 | } |
8d973a83 | 342 | |
8f9b4009 NB |
343 | if (valid) |
344 | file->pchname = pchname; | |
345 | else | |
346 | free (pchname); | |
347 | ||
348 | return valid; | |
17211ab5 GK |
349 | } |
350 | ||
b193dfa8 MLI |
351 | /* Canonicalize the path to FILE. Return the canonical form if it is |
352 | shorter, otherwise return NULL. This function does NOT free the | |
353 | memory pointed by FILE. */ | |
354 | ||
355 | static char * | |
356 | maybe_shorter_path (const char * file) | |
357 | { | |
358 | char * file2 = lrealpath (file); | |
359 | if (file2 && strlen (file2) < strlen (file)) | |
360 | { | |
361 | return file2; | |
362 | } | |
363 | else | |
364 | { | |
365 | free (file2); | |
366 | return NULL; | |
367 | } | |
368 | } | |
369 | ||
8f9b4009 | 370 | /* Try to open the path FILE->name appended to FILE->dir. This is |
cf1ee30c | 371 | where remap and PCH intercept the file lookup process. Return true |
16dd5cfe | 372 | if the file was found, whether or not the open was successful. |
ac81cf0b DM |
373 | Set *INVALID_PCH to true if a PCH file is found but wasn't valid. |
374 | Use LOC when emitting any diagnostics. */ | |
3d67ba1e | 375 | |
e5eba70a | 376 | static bool |
ac81cf0b | 377 | find_file_in_dir (cpp_reader *pfile, _cpp_file *file, bool *invalid_pch, |
620e594b | 378 | location_t loc) |
a58d32c2 | 379 | { |
8f9b4009 | 380 | char *path; |
51d0f328 | 381 | |
8f9b4009 NB |
382 | if (CPP_OPTION (pfile, remap) && (path = remap_filename (pfile, file))) |
383 | ; | |
384 | else | |
94d1613b MS |
385 | if (file->dir->construct) |
386 | path = file->dir->construct (file->name, file->dir); | |
387 | else | |
388 | path = append_file_to_dir (file->name, file->dir); | |
e5eba70a | 389 | |
94d1613b MS |
390 | if (path) |
391 | { | |
b193dfa8 | 392 | hashval_t hv; |
0b4cafec ILT |
393 | char *copy; |
394 | void **pp; | |
395 | ||
eac3e079 JY |
396 | /* We try to canonicalize system headers. For DOS based file |
397 | * system, we always try to shorten non-system headers, as DOS | |
398 | * has a tighter constraint on max path length. */ | |
28939589 | 399 | if ((CPP_OPTION (pfile, canonical_system_headers) && file->dir->sysp) |
eac3e079 JY |
400 | #ifdef HAVE_DOS_BASED_FILE_SYSTEM |
401 | || !file->dir->sysp | |
402 | #endif | |
403 | ) | |
b193dfa8 MLI |
404 | { |
405 | char * canonical_path = maybe_shorter_path (path); | |
406 | if (canonical_path) | |
407 | { | |
408 | /* The canonical path was newly allocated. Let's free the | |
409 | non-canonical one. */ | |
410 | free (path); | |
411 | path = canonical_path; | |
412 | } | |
413 | } | |
414 | ||
415 | hv = htab_hash_string (path); | |
0b4cafec ILT |
416 | if (htab_find_with_hash (pfile->nonexistent_file_hash, path, hv) != NULL) |
417 | { | |
418 | file->err_no = ENOENT; | |
419 | return false; | |
420 | } | |
421 | ||
94d1613b MS |
422 | file->path = path; |
423 | if (pch_open_file (pfile, file, invalid_pch)) | |
424 | return true; | |
51d0f328 | 425 | |
94d1613b MS |
426 | if (open_file (file)) |
427 | return true; | |
428 | ||
429 | if (file->err_no != ENOENT) | |
430 | { | |
ac81cf0b | 431 | open_file_failed (pfile, file, 0, loc); |
94d1613b MS |
432 | return true; |
433 | } | |
434 | ||
0b4cafec ILT |
435 | /* We copy the path name onto an obstack partly so that we don't |
436 | leak the memory, but mostly so that we don't fragment the | |
437 | heap. */ | |
f1bf410c JQ |
438 | copy = (char *) obstack_copy0 (&pfile->nonexistent_file_ob, path, |
439 | strlen (path)); | |
94d1613b | 440 | free (path); |
0b4cafec ILT |
441 | pp = htab_find_slot_with_hash (pfile->nonexistent_file_hash, |
442 | copy, hv, INSERT); | |
443 | *pp = copy; | |
444 | ||
94d1613b MS |
445 | file->path = file->name; |
446 | } | |
447 | else | |
448 | { | |
449 | file->err_no = ENOENT; | |
450 | file->path = NULL; | |
451 | } | |
452 | ||
453 | return false; | |
454 | } | |
51d0f328 | 455 | |
0bf12a52 | 456 | /* Return true iff the missing_header callback found the given HEADER. */ |
94d1613b MS |
457 | static bool |
458 | search_path_exhausted (cpp_reader *pfile, const char *header, _cpp_file *file) | |
459 | { | |
460 | missing_header_cb func = pfile->cb.missing_header; | |
461 | ||
462 | /* When the regular search path doesn't work, try context dependent | |
463 | headers search paths. */ | |
464 | if (func | |
465 | && file->dir == NULL) | |
cf1ee30c | 466 | { |
e3c287c9 | 467 | if ((file->path = func (pfile, header, &file->dir)) != NULL) |
94d1613b MS |
468 | { |
469 | if (open_file (file)) | |
470 | return true; | |
471 | free ((void *)file->path); | |
472 | } | |
473 | file->path = file->name; | |
cf1ee30c NB |
474 | } |
475 | ||
8f9b4009 NB |
476 | return false; |
477 | } | |
478 | ||
4dc299fb PB |
479 | bool |
480 | _cpp_find_failed (_cpp_file *file) | |
481 | { | |
482 | return file->err_no != 0; | |
483 | } | |
484 | ||
8f9b4009 NB |
485 | /* Given a filename FNAME search for such a file in the include path |
486 | starting from START_DIR. If FNAME is the empty string it is | |
1ae58c30 | 487 | interpreted as STDIN if START_DIR is PFILE->no_search_path. |
8f9b4009 NB |
488 | |
489 | If the file is not found in the file cache fall back to the O/S and | |
490 | add the result to our cache. | |
491 | ||
492 | If the file was not found in the filesystem, or there was an error | |
02fa63cd | 493 | opening it, then ERR_NO is nonzero and FD is -1. If the file was |
8f9b4009 NB |
494 | found, then ERR_NO is zero and FD could be -1 or an open file |
495 | descriptor. FD can be -1 if the file was found in the cache and | |
496 | had previously been closed. To open it again pass the return value | |
497 | to open_file(). | |
1efcb8c6 | 498 | |
4623a6f2 NS |
499 | If KIND is _cpp_FFK_PRE_INCLUDE then it is OK for the file to be |
500 | missing. If present, it is OK for a precompiled header to be | |
501 | included after it. | |
ac81cf0b DM |
502 | |
503 | Use LOC as the location for any errors. */ | |
504 | ||
4dc299fb | 505 | _cpp_file * |
1efcb8c6 | 506 | _cpp_find_file (cpp_reader *pfile, const char *fname, cpp_dir *start_dir, |
4623a6f2 | 507 | int angle_brackets, _cpp_find_file_kind kind, location_t loc) |
8f9b4009 | 508 | { |
3d67ba1e | 509 | bool invalid_pch = false; |
0b4cafec ILT |
510 | bool saw_bracket_include = false; |
511 | bool saw_quote_include = false; | |
512 | struct cpp_dir *found_in_cache = NULL; | |
8f9b4009 NB |
513 | |
514 | /* Ensure we get no confusion between cached files and directories. */ | |
515 | if (start_dir == NULL) | |
ac81cf0b | 516 | cpp_error_at (pfile, CPP_DL_ICE, loc, "NULL directory in find_file"); |
8f9b4009 | 517 | |
4623a6f2 | 518 | void **hash_slot |
15fd8332 JJ |
519 | = htab_find_slot_with_hash (pfile->file_hash, fname, |
520 | htab_hash_string (fname), INSERT); | |
17211ab5 | 521 | |
8f9b4009 | 522 | /* First check the cache before we resort to memory allocation. */ |
4623a6f2 NS |
523 | cpp_file_hash_entry *entry |
524 | = search_cache ((struct cpp_file_hash_entry *) *hash_slot, start_dir); | |
8f9b4009 NB |
525 | if (entry) |
526 | return entry->u.file; | |
527 | ||
bf425849 | 528 | _cpp_file *file = make_cpp_file (start_dir, fname); |
4bda5946 | 529 | file->implicit_preinclude |
4623a6f2 NS |
530 | = (kind == _cpp_FFK_PRE_INCLUDE |
531 | || (pfile->buffer && pfile->buffer->file->implicit_preinclude)); | |
8f9b4009 | 532 | |
4623a6f2 | 533 | if (kind != _cpp_FFK_FAKE) |
b0d11f1e NS |
534 | /* Try each path in the include chain. */ |
535 | for (;;) | |
536 | { | |
537 | if (find_file_in_dir (pfile, file, &invalid_pch, loc)) | |
8f9b4009 | 538 | break; |
49634b3a | 539 | |
b0d11f1e NS |
540 | file->dir = file->dir->next; |
541 | if (file->dir == NULL) | |
542 | { | |
543 | if (search_path_exhausted (pfile, fname, file)) | |
544 | { | |
545 | /* Although this file must not go in the cache, | |
546 | because the file found might depend on things (like | |
547 | the current file) that aren't represented in the | |
548 | cache, it still has to go in the list of all files | |
549 | so that #import works. */ | |
550 | file->next_file = pfile->all_files; | |
551 | pfile->all_files = file; | |
552 | if (*hash_slot == NULL) | |
553 | { | |
554 | /* If *hash_slot is NULL, the above | |
555 | htab_find_slot_with_hash call just created the | |
671a2836 MS |
556 | slot, but we aren't going to store there anything |
557 | of use, so need to remove the newly created entry. | |
558 | htab_clear_slot requires that it is non-NULL, so | |
559 | store some non-NULL but valid pointer there, | |
560 | htab_clear_slot will immediately overwrite it. */ | |
b0d11f1e NS |
561 | *hash_slot = file; |
562 | htab_clear_slot (pfile->file_hash, hash_slot); | |
563 | } | |
564 | return file; | |
565 | } | |
566 | ||
567 | if (invalid_pch) | |
568 | { | |
569 | cpp_error (pfile, CPP_DL_ERROR, | |
570 | "one or more PCH files were found," | |
571 | " but they were invalid"); | |
572 | if (!cpp_get_options (pfile)->warn_invalid_pch) | |
cb808c58 | 573 | cpp_error (pfile, CPP_DL_NOTE, |
b0d11f1e NS |
574 | "use -Winvalid-pch for more information"); |
575 | } | |
576 | ||
4623a6f2 | 577 | if (kind == _cpp_FFK_PRE_INCLUDE) |
b0d11f1e NS |
578 | { |
579 | free ((char *) file->name); | |
580 | free (file); | |
581 | if (*hash_slot == NULL) | |
582 | { | |
583 | /* See comment on the above htab_clear_slot call. */ | |
671a2836 | 584 | *hash_slot = &hash_slot; |
b0d11f1e NS |
585 | htab_clear_slot (pfile->file_hash, hash_slot); |
586 | } | |
587 | return NULL; | |
588 | } | |
eb1f4d9d | 589 | |
4623a6f2 | 590 | if (kind != _cpp_FFK_HAS_INCLUDE) |
ad1a3914 | 591 | open_file_failed (pfile, file, angle_brackets, loc); |
b0d11f1e NS |
592 | break; |
593 | } | |
594 | ||
595 | /* Only check the cache for the starting location (done above) | |
596 | and the quote and bracket chain heads because there are no | |
597 | other possible starting points for searches. */ | |
598 | if (file->dir == pfile->bracket_include) | |
599 | saw_bracket_include = true; | |
600 | else if (file->dir == pfile->quote_include) | |
601 | saw_quote_include = true; | |
602 | else | |
603 | continue; | |
604 | ||
605 | entry | |
606 | = search_cache ((struct cpp_file_hash_entry *) *hash_slot, file->dir); | |
607 | if (entry) | |
608 | { | |
609 | found_in_cache = file->dir; | |
610 | break; | |
611 | } | |
612 | } | |
c6e83800 | 613 | |
f5eab47e JJ |
614 | if (entry) |
615 | { | |
616 | /* Cache for START_DIR too, sharing the _cpp_file structure. */ | |
617 | free ((char *) file->name); | |
618 | free (file); | |
619 | file = entry->u.file; | |
620 | } | |
621 | else | |
622 | { | |
623 | /* This is a new file; put it in the list. */ | |
624 | file->next_file = pfile->all_files; | |
625 | pfile->all_files = file; | |
c6e83800 ZW |
626 | } |
627 | ||
8f9b4009 NB |
628 | /* Store this new result in the hash table. */ |
629 | entry = new_file_hash_entry (pfile); | |
d87fc699 | 630 | entry->next = (struct cpp_file_hash_entry *) *hash_slot; |
8f9b4009 | 631 | entry->start_dir = start_dir; |
7cf3f604 | 632 | entry->location = loc; |
8f9b4009 | 633 | entry->u.file = file; |
15fd8332 | 634 | *hash_slot = (void *) entry; |
e5eba70a | 635 | |
0b4cafec ILT |
636 | /* If we passed the quote or bracket chain heads, cache them also. |
637 | This speeds up processing if there are lots of -I options. */ | |
638 | if (saw_bracket_include | |
639 | && pfile->bracket_include != start_dir | |
640 | && found_in_cache != pfile->bracket_include) | |
641 | { | |
642 | entry = new_file_hash_entry (pfile); | |
d87fc699 | 643 | entry->next = (struct cpp_file_hash_entry *) *hash_slot; |
0b4cafec | 644 | entry->start_dir = pfile->bracket_include; |
7cf3f604 | 645 | entry->location = loc; |
0b4cafec | 646 | entry->u.file = file; |
15fd8332 | 647 | *hash_slot = (void *) entry; |
0b4cafec ILT |
648 | } |
649 | if (saw_quote_include | |
650 | && pfile->quote_include != start_dir | |
651 | && found_in_cache != pfile->quote_include) | |
652 | { | |
653 | entry = new_file_hash_entry (pfile); | |
d87fc699 | 654 | entry->next = (struct cpp_file_hash_entry *) *hash_slot; |
0b4cafec | 655 | entry->start_dir = pfile->quote_include; |
7cf3f604 | 656 | entry->location = loc; |
0b4cafec | 657 | entry->u.file = file; |
15fd8332 | 658 | *hash_slot = (void *) entry; |
0b4cafec ILT |
659 | } |
660 | ||
8f9b4009 | 661 | return file; |
a58d32c2 ZW |
662 | } |
663 | ||
8f9b4009 | 664 | /* Read a file into FILE->buffer, returning true on success. |
a58d32c2 | 665 | |
8f9b4009 NB |
666 | If FILE->fd is something weird, like a block device, we don't want |
667 | to read it at all. Don't even try to figure out what something is, | |
668 | except for plain files and block devices, since there is no | |
669 | reliable portable way of doing this. | |
a58d32c2 | 670 | |
ac81cf0b DM |
671 | Use LOC for any diagnostics. |
672 | ||
3ac6b5cf LH |
673 | PFILE may be NULL. In this case, no diagnostics are issued. |
674 | ||
a58d32c2 | 675 | FIXME: Flush file cache and try again if we run out of memory. */ |
8f9b4009 | 676 | static bool |
3ac6b5cf LH |
677 | read_file_guts (cpp_reader *pfile, _cpp_file *file, location_t loc, |
678 | const char *input_charset) | |
a58d32c2 | 679 | { |
8f9b4009 | 680 | ssize_t size, total, count; |
562a5c27 | 681 | uchar *buf; |
8f9b4009 | 682 | bool regular; |
16dd5cfe | 683 | |
8f9b4009 NB |
684 | if (S_ISBLK (file->st.st_mode)) |
685 | { | |
3ac6b5cf LH |
686 | if (pfile) |
687 | cpp_error_at (pfile, CPP_DL_ERROR, loc, | |
688 | "%s is a block device", file->path); | |
8f9b4009 NB |
689 | return false; |
690 | } | |
a58d32c2 | 691 | |
fc0993ac | 692 | regular = S_ISREG (file->st.st_mode) != 0; |
8f9b4009 | 693 | if (regular) |
f2d5f0cc | 694 | { |
a58d32c2 ZW |
695 | /* off_t might have a wider range than ssize_t - in other words, |
696 | the max size of a file might be bigger than the address | |
697 | space. We can't handle a file that large. (Anyone with | |
698 | a single source file bigger than 2GB needs to rethink | |
699 | their coding style.) Some systems (e.g. AIX 4.1) define | |
700 | SSIZE_MAX to be much smaller than the actual range of the | |
701 | type. Use INTTYPE_MAXIMUM unconditionally to ensure this | |
702 | does not bite us. */ | |
8f9b4009 | 703 | if (file->st.st_size > INTTYPE_MAXIMUM (ssize_t)) |
f2d5f0cc | 704 | { |
3ac6b5cf LH |
705 | if (pfile) |
706 | cpp_error_at (pfile, CPP_DL_ERROR, loc, | |
707 | "%s is too large", file->path); | |
8f9b4009 | 708 | return false; |
f2d5f0cc | 709 | } |
a58d32c2 | 710 | |
8f9b4009 NB |
711 | size = file->st.st_size; |
712 | } | |
713 | else | |
714 | /* 8 kilobytes is a sensible starting size. It ought to be bigger | |
715 | than the kernel pipe buffer, and it's definitely bigger than | |
716 | the majority of C source files. */ | |
717 | size = 8 * 1024; | |
718 | ||
f41e5bd1 JJ |
719 | /* The + 16 here is space for the final '\n' and 15 bytes of padding, |
720 | used to quiet warnings from valgrind or Address Sanitizer, when the | |
721 | optimized lexer accesses aligned 16-byte memory chunks, including | |
722 | the bytes after the malloced, area, and stops lexing on '\n'. */ | |
723 | buf = XNEWVEC (uchar, size + 16); | |
8f9b4009 NB |
724 | total = 0; |
725 | while ((count = read (file->fd, buf + total, size - total)) > 0) | |
726 | { | |
727 | total += count; | |
728 | ||
729 | if (total == size) | |
d4506961 | 730 | { |
8f9b4009 NB |
731 | if (regular) |
732 | break; | |
733 | size *= 2; | |
f41e5bd1 | 734 | buf = XRESIZEVEC (uchar, buf, size + 16); |
d4506961 | 735 | } |
a58d32c2 | 736 | } |
8f9b4009 NB |
737 | |
738 | if (count < 0) | |
a58d32c2 | 739 | { |
3ac6b5cf LH |
740 | if (pfile) |
741 | cpp_errno_filename (pfile, CPP_DL_ERROR, file->path, loc); | |
55e7f907 | 742 | free (buf); |
8f9b4009 | 743 | return false; |
a58d32c2 | 744 | } |
8f9b4009 | 745 | |
3ac6b5cf | 746 | if (pfile && regular && total != size && STAT_SIZE_RELIABLE (file->st)) |
ac81cf0b | 747 | cpp_error_at (pfile, CPP_DL_WARNING, loc, |
0527bc4e | 748 | "%s is shorter than expected", file->path); |
8f9b4009 | 749 | |
688e7a53 | 750 | file->buffer = _cpp_convert_input (pfile, |
3ac6b5cf | 751 | input_charset, |
f41e5bd1 | 752 | buf, size + 16, total, |
688e7a53 TT |
753 | &file->buffer_start, |
754 | &file->st.st_size); | |
3ac6b5cf LH |
755 | file->buffer_valid = file->buffer; |
756 | return file->buffer_valid; | |
8f9b4009 NB |
757 | } |
758 | ||
759 | /* Convenience wrapper around read_file_guts that opens the file if | |
a98ebe2e | 760 | necessary and closes the file descriptor after reading. FILE must |
ac81cf0b | 761 | have been passed through find_file() at some stage. Use LOC for |
3ac6b5cf | 762 | any diagnostics. Unlike read_file_guts(), PFILE may not be NULL. */ |
8f9b4009 | 763 | static bool |
620e594b | 764 | read_file (cpp_reader *pfile, _cpp_file *file, location_t loc) |
8f9b4009 | 765 | { |
8f9b4009 NB |
766 | /* If we already have its contents in memory, succeed immediately. */ |
767 | if (file->buffer_valid) | |
768 | return true; | |
a58d32c2 | 769 | |
8f9b4009 NB |
770 | /* If an earlier read failed for some reason don't try again. */ |
771 | if (file->dont_read || file->err_no) | |
772 | return false; | |
4d6baafa | 773 | |
8f9b4009 NB |
774 | if (file->fd == -1 && !open_file (file)) |
775 | { | |
ac81cf0b | 776 | open_file_failed (pfile, file, 0, loc); |
8f9b4009 | 777 | return false; |
f2d5f0cc | 778 | } |
d7a2e0f7 | 779 | |
3ac6b5cf LH |
780 | file->dont_read = !read_file_guts (pfile, file, loc, |
781 | CPP_OPTION (pfile, input_charset)); | |
8f9b4009 NB |
782 | close (file->fd); |
783 | file->fd = -1; | |
a58d32c2 | 784 | |
8f9b4009 | 785 | return !file->dont_read; |
a58d32c2 ZW |
786 | } |
787 | ||
b0d11f1e NS |
788 | /* Returns TRUE if FILE is already known to be idempotent, and should |
789 | therefore not be read again. */ | |
8f9b4009 | 790 | static bool |
b0d11f1e | 791 | is_known_idempotent_file (cpp_reader *pfile, _cpp_file *file, bool import) |
a58d32c2 | 792 | { |
49634b3a NB |
793 | /* Skip once-only files. */ |
794 | if (file->once_only) | |
b0d11f1e | 795 | return true; |
49634b3a | 796 | |
16dd5cfe | 797 | /* We must mark the file once-only if #import now, before header |
49634b3a NB |
798 | guard checks. Otherwise, undefining the header guard might |
799 | cause the file to be re-stacked. */ | |
800 | if (import) | |
801 | { | |
802 | _cpp_mark_file_once_only (pfile, file); | |
803 | ||
804 | /* Don't stack files that have been stacked before. */ | |
805 | if (file->stack_count) | |
b0d11f1e | 806 | return true; |
49634b3a NB |
807 | } |
808 | ||
cf1ee30c NB |
809 | /* Skip if the file had a header guard and the macro is defined. |
810 | PCH relies on this appearing before the PCH handler below. */ | |
3f6677f4 | 811 | if (file->cmacro && cpp_macro_p (file->cmacro)) |
b0d11f1e | 812 | return true; |
bf42e45b | 813 | |
cf1ee30c | 814 | /* Handle PCH files immediately; don't stack them. */ |
d4c32e1d | 815 | if (file->pchname) |
c31a6508 | 816 | { |
c0d578e6 | 817 | pfile->cb.read_pch (pfile, file->pchname, file->fd, file->path); |
cf1ee30c | 818 | file->fd = -1; |
d4c32e1d JJ |
819 | free ((void *) file->pchname); |
820 | file->pchname = NULL; | |
b0d11f1e | 821 | return true; |
c31a6508 | 822 | } |
8f9b4009 | 823 | |
b0d11f1e NS |
824 | return false; |
825 | } | |
c31a6508 | 826 | |
b0d11f1e NS |
827 | /* Return TRUE if file has unique contents, so we should read process |
828 | it. The file's contents must already have been read. */ | |
829 | ||
830 | static bool | |
831 | has_unique_contents (cpp_reader *pfile, _cpp_file *file, bool import, | |
832 | location_t loc) | |
833 | { | |
73e61092 GK |
834 | /* Check the file against the PCH file. This is done before |
835 | checking against files we've already seen, since it may save on | |
836 | I/O. */ | |
837 | if (check_file_against_entries (pfile, file, import)) | |
838 | { | |
839 | /* If this isn't a #import, but yet we can't include the file, | |
840 | that means that it was #import-ed in the PCH file, | |
841 | so we can never include it again. */ | |
842 | if (! import) | |
843 | _cpp_mark_file_once_only (pfile, file); | |
844 | return false; | |
845 | } | |
846 | ||
49634b3a NB |
847 | /* Now we've read the file's contents, we can stack it if there |
848 | are no once-only files. */ | |
849 | if (!pfile->seen_once_only) | |
cf1ee30c NB |
850 | return true; |
851 | ||
49634b3a | 852 | /* We may have read the file under a different name. Look |
8f9b4009 | 853 | for likely candidates and compare file contents to be sure. */ |
b0d11f1e | 854 | for (_cpp_file *f = pfile->all_files; f; f = f->next_file) |
8f9b4009 NB |
855 | { |
856 | if (f == file) | |
b0d11f1e | 857 | continue; /* It'sa me! */ |
8f9b4009 | 858 | |
49634b3a NB |
859 | if ((import || f->once_only) |
860 | && f->err_no == 0 | |
8f9b4009 | 861 | && f->st.st_mtime == file->st.st_mtime |
1b449375 EB |
862 | && f->st.st_size == file->st.st_size) |
863 | { | |
864 | _cpp_file *ref_file; | |
1b449375 EB |
865 | |
866 | if (f->buffer && !f->buffer_valid) | |
867 | { | |
868 | /* We already have a buffer but it is not valid, because | |
869 | the file is still stacked. Make a new one. */ | |
bf425849 | 870 | ref_file = make_cpp_file (f->dir, f->name); |
1b449375 EB |
871 | ref_file->path = f->path; |
872 | } | |
873 | else | |
874 | /* The file is not stacked anymore. We can reuse it. */ | |
875 | ref_file = f; | |
876 | ||
b0d11f1e NS |
877 | bool same_file_p = (read_file (pfile, ref_file, loc) |
878 | /* Size might have changed in read_file(). */ | |
879 | && ref_file->st.st_size == file->st.st_size | |
880 | && !memcmp (ref_file->buffer, file->buffer, | |
881 | file->st.st_size)); | |
1b449375 EB |
882 | |
883 | if (f->buffer && !f->buffer_valid) | |
884 | { | |
885 | ref_file->path = 0; | |
886 | destroy_cpp_file (ref_file); | |
887 | } | |
888 | ||
889 | if (same_file_p) | |
b0d11f1e NS |
890 | /* Already seen under a different name. */ |
891 | return false; | |
1b449375 | 892 | } |
0b3d776a | 893 | } |
8f9b4009 | 894 | |
b0d11f1e | 895 | return true; |
cf1ee30c NB |
896 | } |
897 | ||
898 | /* Place the file referenced by FILE into a new buffer on the buffer | |
7ceb899e NS |
899 | stack if possible. Returns true if a buffer is stacked. Use LOC |
900 | for any diagnostics. */ | |
901 | ||
4dc299fb | 902 | bool |
b0d11f1e | 903 | _cpp_stack_file (cpp_reader *pfile, _cpp_file *file, include_type type, |
620e594b | 904 | location_t loc) |
cf1ee30c | 905 | { |
b0d11f1e NS |
906 | if (is_known_idempotent_file (pfile, file, type == IT_IMPORT)) |
907 | return false; | |
cf1ee30c | 908 | |
7ceb899e NS |
909 | int sysp = 0; |
910 | char *buf = nullptr; | |
cf1ee30c | 911 | |
7ceb899e NS |
912 | /* Check C++ module include translation. */ |
913 | if (!file->header_unit && type < IT_HEADER_HWM | |
914 | /* Do not include translate include-next. */ | |
915 | && type != IT_INCLUDE_NEXT | |
916 | && pfile->cb.translate_include) | |
917 | buf = (pfile->cb.translate_include | |
918 | (pfile, pfile->line_table, loc, file->path)); | |
b0d11f1e | 919 | |
7ceb899e NS |
920 | if (buf) |
921 | { | |
922 | /* We don't increment the line number at the end of a buffer, | |
923 | because we don't usually need that location (we're popping an | |
924 | include file). However in this case we do want to do the | |
925 | increment. So push a writable buffer of two newlines to acheive | |
b37695c9 NS |
926 | that. (We also need an extra newline, so this looks like a regular |
927 | file, which we do that to to make sure we don't fall off the end in the | |
928 | middle of a line. */ | |
929 | static uchar newlines[] = "\n\n\n"; | |
7ceb899e NS |
930 | cpp_push_buffer (pfile, newlines, 2, true); |
931 | ||
b37695c9 NS |
932 | size_t len = strlen (buf); |
933 | buf[len] = '\n'; /* See above */ | |
7ceb899e NS |
934 | cpp_buffer *buffer |
935 | = cpp_push_buffer (pfile, reinterpret_cast<unsigned char *> (buf), | |
b37695c9 | 936 | len, true); |
7ceb899e NS |
937 | buffer->to_free = buffer->buf; |
938 | ||
939 | file->header_unit = +1; | |
940 | _cpp_mark_file_once_only (pfile, file); | |
941 | } | |
942 | else | |
943 | { | |
944 | /* Not a header unit, and we know it. */ | |
945 | file->header_unit = -1; | |
946 | ||
947 | if (!read_file (pfile, file, loc)) | |
948 | return false; | |
949 | ||
950 | if (!has_unique_contents (pfile, file, type == IT_IMPORT, loc)) | |
951 | return false; | |
952 | ||
953 | if (pfile->buffer && file->dir) | |
954 | sysp = MAX (pfile->buffer->sysp, file->dir->sysp); | |
955 | ||
956 | /* Add the file to the dependencies on its first inclusion. */ | |
957 | if (CPP_OPTION (pfile, deps.style) > (sysp != 0) | |
958 | && !file->stack_count | |
959 | && file->path[0] | |
bf425849 NS |
960 | && !(pfile->main_file == file |
961 | && CPP_OPTION (pfile, deps.ignore_main_file))) | |
7ceb899e NS |
962 | deps_add_dep (pfile->deps, file->path); |
963 | ||
964 | /* Clear buffer_valid since _cpp_clean_line messes it up. */ | |
965 | file->buffer_valid = false; | |
966 | file->stack_count++; | |
967 | ||
968 | /* Stack the buffer. */ | |
969 | cpp_buffer *buffer | |
970 | = cpp_push_buffer (pfile, file->buffer, file->st.st_size, | |
971 | CPP_OPTION (pfile, preprocessed) | |
972 | && !CPP_OPTION (pfile, directives_only)); | |
973 | buffer->file = file; | |
974 | buffer->sysp = sysp; | |
975 | buffer->to_free = file->buffer_start; | |
976 | ||
977 | /* Initialize controlling macro state. */ | |
978 | pfile->mi_valid = true; | |
979 | pfile->mi_cmacro = 0; | |
980 | } | |
cf1ee30c | 981 | |
056f95ec NS |
982 | /* In the case of a normal #include, we're now at the start of the |
983 | line *following* the #include. A separate location_t for this | |
984 | location makes no sense, until we do the LC_LEAVE. | |
985 | ||
986 | This does not apply if we found a PCH file, we're not a regular | |
987 | include, or we ran out of locations. */ | |
7ceb899e NS |
988 | bool decrement = (file->pchname == NULL |
989 | && type < IT_DIRECTIVE_HWM | |
990 | && (pfile->line_table->highest_location | |
991 | != LINE_MAP_MAX_LOCATION - 1)); | |
992 | if (decrement) | |
056f95ec | 993 | pfile->line_table->highest_location--; |
b0d11f1e | 994 | |
7ceb899e NS |
995 | if (file->header_unit <= 0) |
996 | /* Add line map and do callbacks. */ | |
997 | _cpp_do_file_change (pfile, LC_ENTER, file->path, | |
d1c566d7 NS |
998 | /* With preamble injection, start on line zero, |
999 | so the preamble doesn't appear to have been | |
1000 | included from line 1. Likewise when | |
1001 | starting preprocessed, we expect an initial | |
1002 | locating line. */ | |
7ceb899e NS |
1003 | type == IT_PRE_MAIN ? 0 : 1, sysp); |
1004 | else if (decrement) | |
1005 | { | |
1006 | /* Adjust the line back one so we appear on the #include line itself. */ | |
1007 | const line_map_ordinary *map | |
1008 | = LINEMAPS_LAST_ORDINARY_MAP (pfile->line_table); | |
1009 | linenum_type line = SOURCE_LINE (map, pfile->line_table->highest_line); | |
1010 | linemap_line_start (pfile->line_table, line - 1, 0); | |
1011 | } | |
cf1ee30c NB |
1012 | |
1013 | return true; | |
add7091b ZW |
1014 | } |
1015 | ||
49634b3a | 1016 | /* Mark FILE to be included once only. */ |
8f9b4009 | 1017 | void |
49634b3a | 1018 | _cpp_mark_file_once_only (cpp_reader *pfile, _cpp_file *file) |
f2d5f0cc | 1019 | { |
49634b3a NB |
1020 | pfile->seen_once_only = true; |
1021 | file->once_only = true; | |
8f9b4009 NB |
1022 | } |
1023 | ||
1024 | /* Return the directory from which searching for FNAME should start, | |
2067c116 | 1025 | considering the directive TYPE and ANGLE_BRACKETS. If there is |
8f9b4009 NB |
1026 | nothing left in the path, returns NULL. */ |
1027 | static struct cpp_dir * | |
1028 | search_path_head (cpp_reader *pfile, const char *fname, int angle_brackets, | |
1029 | enum include_type type) | |
1030 | { | |
1031 | cpp_dir *dir; | |
1032 | _cpp_file *file; | |
74eb4b3e | 1033 | |
3dce1408 | 1034 | if (IS_ABSOLUTE_PATH (fname)) |
8f9b4009 NB |
1035 | return &pfile->no_search_path; |
1036 | ||
4dc299fb PB |
1037 | /* pfile->buffer is NULL when processing an -include command-line flag. */ |
1038 | file = pfile->buffer == NULL ? pfile->main_file : pfile->buffer->file; | |
41947a54 NB |
1039 | |
1040 | /* For #include_next, skip in the search path past the dir in which | |
e7182666 NB |
1041 | the current file was found, but if it was found via an absolute |
1042 | path use the normal search logic. */ | |
b0f4807f MM |
1043 | if (type == IT_INCLUDE_NEXT && file->dir |
1044 | && file->dir != &pfile->no_search_path) | |
8f9b4009 | 1045 | dir = file->dir->next; |
74eb4b3e | 1046 | else if (angle_brackets) |
8f9b4009 NB |
1047 | dir = pfile->bracket_include; |
1048 | else if (type == IT_CMDLINE) | |
1049 | /* -include and -imacros use the #include "" chain with the | |
1050 | preprocessor's cwd prepended. */ | |
1051 | return make_cpp_dir (pfile, "./", false); | |
1052 | else if (pfile->quote_ignores_source_dir) | |
1053 | dir = pfile->quote_include; | |
41947a54 | 1054 | else |
12f9df4e PB |
1055 | return make_cpp_dir (pfile, dir_name_of_file (file), |
1056 | pfile->buffer ? pfile->buffer->sysp : 0); | |
8f9b4009 NB |
1057 | |
1058 | if (dir == NULL) | |
0527bc4e | 1059 | cpp_error (pfile, CPP_DL_ERROR, |
8f9b4009 NB |
1060 | "no include path in which to search for %s", fname); |
1061 | ||
1062 | return dir; | |
1063 | } | |
41947a54 | 1064 | |
8f9b4009 | 1065 | /* Strip the basename from the file's path. It ends with a slash if |
02fa63cd | 1066 | of nonzero length. Note that this procedure also works for |
8f9b4009 NB |
1067 | <stdin>, which is represented by the empty string. */ |
1068 | static const char * | |
1069 | dir_name_of_file (_cpp_file *file) | |
1070 | { | |
1071 | if (!file->dir_name) | |
41947a54 | 1072 | { |
8f9b4009 | 1073 | size_t len = lbasename (file->path) - file->path; |
c3f829c1 | 1074 | char *dir_name = XNEWVEC (char, len + 1); |
8f9b4009 NB |
1075 | |
1076 | memcpy (dir_name, file->path, len); | |
1077 | dir_name[len] = '\0'; | |
1078 | file->dir_name = dir_name; | |
41947a54 NB |
1079 | } |
1080 | ||
8f9b4009 NB |
1081 | return file->dir_name; |
1082 | } | |
1083 | ||
8f9b4009 NB |
1084 | /* Handles #include-family directives (distinguished by TYPE), |
1085 | including HEADER, and the command line -imacros and -include. | |
1086 | Returns true if a buffer was stacked. */ | |
1087 | bool | |
1088 | _cpp_stack_include (cpp_reader *pfile, const char *fname, int angle_brackets, | |
620e594b | 1089 | enum include_type type, location_t loc) |
8f9b4009 | 1090 | { |
cc811a8a BE |
1091 | /* For -include command-line flags we have type == IT_CMDLINE. |
1092 | When the first -include file is processed we have the case, where | |
1093 | pfile->cur_token == pfile->cur_run->base, we are directly called up | |
1094 | by the front end. However in the case of the second -include file, | |
1095 | we are called from _cpp_lex_token -> _cpp_get_fresh_line -> | |
1096 | cpp_push_include, with pfile->cur_token != pfile->cur_run->base, | |
1097 | and pfile->cur_token[-1].src_loc not (yet) initialized. | |
1098 | However, when the include file cannot be found, we need src_loc to | |
1099 | be initialized to some safe value: 0 means UNKNOWN_LOCATION. */ | |
1100 | if (type == IT_CMDLINE && pfile->cur_token != pfile->cur_run->base) | |
1101 | pfile->cur_token[-1].src_loc = 0; | |
1102 | ||
b0d11f1e | 1103 | cpp_dir *dir = search_path_head (pfile, fname, angle_brackets, type); |
8f9b4009 NB |
1104 | if (!dir) |
1105 | return false; | |
1106 | ||
ad1a3914 | 1107 | _cpp_file *file = _cpp_find_file (pfile, fname, dir, angle_brackets, |
4623a6f2 NS |
1108 | type == IT_DEFAULT ? _cpp_FFK_PRE_INCLUDE |
1109 | : _cpp_FFK_NORMAL, loc); | |
1efcb8c6 JM |
1110 | if (type == IT_DEFAULT && file == NULL) |
1111 | return false; | |
22234f56 | 1112 | |
b0d11f1e | 1113 | return _cpp_stack_file (pfile, file, type, loc); |
8f9b4009 NB |
1114 | } |
1115 | ||
1f9db692 | 1116 | /* NAME is a header file name, find the _cpp_file, if any. */ |
7ceb899e | 1117 | |
1f9db692 NS |
1118 | static _cpp_file * |
1119 | test_header_unit (cpp_reader *pfile, const char *name, bool angle, | |
1120 | location_t loc) | |
7ceb899e | 1121 | { |
1f9db692 NS |
1122 | if (cpp_dir *dir = search_path_head (pfile, name, angle, IT_INCLUDE)) |
1123 | return _cpp_find_file (pfile, name, dir, angle, _cpp_FFK_NORMAL, loc); | |
7ceb899e | 1124 | |
1f9db692 NS |
1125 | return nullptr; |
1126 | } | |
1127 | ||
1128 | /* NAME is a header file name, find the path we'll use to open it and infer that | |
1129 | it is a header-unit. */ | |
7ceb899e | 1130 | |
1f9db692 NS |
1131 | const char * |
1132 | _cpp_find_header_unit (cpp_reader *pfile, const char *name, bool angle, | |
1133 | location_t loc) | |
1134 | { | |
1135 | if (_cpp_file *file = test_header_unit (pfile, name, angle, loc)) | |
7ceb899e | 1136 | { |
1f9db692 NS |
1137 | if (file->fd > 0) |
1138 | { | |
1139 | /* Don't leave it open. */ | |
1140 | close (file->fd); | |
1141 | file->fd = 0; | |
1142 | } | |
1143 | ||
1144 | file->header_unit = +1; | |
1145 | _cpp_mark_file_once_only (pfile, file); | |
1146 | ||
1147 | return file->path; | |
7ceb899e NS |
1148 | } |
1149 | ||
1f9db692 NS |
1150 | return nullptr; |
1151 | } | |
1152 | ||
1153 | /* NAME is a header file name, find the path we'll use to open it. But do not | |
1154 | infer it is a header unit. */ | |
1155 | ||
1156 | const char * | |
1157 | cpp_probe_header_unit (cpp_reader *pfile, const char *name, bool angle, | |
1158 | location_t loc) | |
1159 | { | |
1160 | if (_cpp_file *file = test_header_unit (pfile, name, angle, loc)) | |
1161 | return file->path; | |
1162 | ||
1163 | return nullptr; | |
7ceb899e NS |
1164 | } |
1165 | ||
9844497a NS |
1166 | /* Retrofit the just-entered main file asif it was an include. This |
1167 | will permit correct include_next use, and mark it as a system | |
1168 | header if that's where it resides. We use filesystem-appropriate | |
1169 | prefix matching of the include path to locate the main file. */ | |
1170 | void | |
1171 | cpp_retrofit_as_include (cpp_reader *pfile) | |
1172 | { | |
1173 | /* We should be the outermost. */ | |
1174 | gcc_assert (!pfile->buffer->prev); | |
1175 | ||
1176 | if (const char *name = pfile->main_file->name) | |
1177 | { | |
1178 | /* Locate name on the include dir path, using a prefix match. */ | |
1179 | size_t name_len = strlen (name); | |
1180 | for (cpp_dir *dir = pfile->quote_include; dir; dir = dir->next) | |
1181 | if (dir->len < name_len | |
1182 | && IS_DIR_SEPARATOR (name[dir->len]) | |
1183 | && !filename_ncmp (name, dir->name, dir->len)) | |
1184 | { | |
1185 | pfile->main_file->dir = dir; | |
1186 | if (dir->sysp) | |
1187 | cpp_make_system_header (pfile, 1, 0); | |
1188 | break; | |
1189 | } | |
1190 | } | |
1191 | ||
1192 | /* Initialize controlling macro state. */ | |
1193 | pfile->mi_valid = true; | |
1194 | pfile->mi_cmacro = 0; | |
1195 | } | |
1196 | ||
8f9b4009 NB |
1197 | /* Could not open FILE. The complication is dependency output. */ |
1198 | static void | |
ac81cf0b | 1199 | open_file_failed (cpp_reader *pfile, _cpp_file *file, int angle_brackets, |
620e594b | 1200 | location_t loc) |
8f9b4009 | 1201 | { |
500bee0a | 1202 | int sysp = pfile->line_table->highest_line > 1 && pfile->buffer ? pfile->buffer->sysp : 0; |
6568f34b | 1203 | bool print_dep = CPP_OPTION (pfile, deps.style) > (angle_brackets || !!sysp); |
8f9b4009 NB |
1204 | |
1205 | errno = file->err_no; | |
1206 | if (print_dep && CPP_OPTION (pfile, deps.missing_files) && errno == ENOENT) | |
74dc6a11 CD |
1207 | { |
1208 | deps_add_dep (pfile->deps, file->name); | |
1209 | /* If the preprocessor output (other than dependency information) is | |
1210 | being used, we must also flag an error. */ | |
1211 | if (CPP_OPTION (pfile, deps.need_preprocessor_output)) | |
46ce03de | 1212 | cpp_errno_filename (pfile, CPP_DL_FATAL, |
ac81cf0b DM |
1213 | file->path ? file->path : file->name, |
1214 | loc); | |
74dc6a11 | 1215 | } |
8f9b4009 | 1216 | else |
add7091b | 1217 | { |
74dc6a11 CD |
1218 | /* If we are not outputting dependencies, or if we are and dependencies |
1219 | were requested for this file, or if preprocessor output is needed | |
1220 | in addition to dependency information, this is an error. | |
1221 | ||
1222 | Otherwise (outputting dependencies but not for this file, and not | |
1223 | using the preprocessor output), we can still produce correct output | |
1224 | so it's only a warning. */ | |
1225 | if (CPP_OPTION (pfile, deps.style) == DEPS_NONE | |
1226 | || print_dep | |
1227 | || CPP_OPTION (pfile, deps.need_preprocessor_output)) | |
46ce03de | 1228 | cpp_errno_filename (pfile, CPP_DL_FATAL, |
ac81cf0b DM |
1229 | file->path ? file->path : file->name, |
1230 | loc); | |
74dc6a11 | 1231 | else |
46ce03de | 1232 | cpp_errno_filename (pfile, CPP_DL_WARNING, |
ac81cf0b DM |
1233 | file->path ? file->path : file->name, |
1234 | loc); | |
add7091b | 1235 | } |
8f9b4009 | 1236 | } |
591e15a1 | 1237 | |
8f9b4009 NB |
1238 | /* Search in the chain beginning at HEAD for a file whose search path |
1239 | started at START_DIR != NULL. */ | |
d87fc699 JH |
1240 | static struct cpp_file_hash_entry * |
1241 | search_cache (struct cpp_file_hash_entry *head, const cpp_dir *start_dir) | |
8f9b4009 | 1242 | { |
f5eab47e JJ |
1243 | while (head && head->start_dir != start_dir) |
1244 | head = head->next; | |
1245 | ||
1246 | return head; | |
8f9b4009 NB |
1247 | } |
1248 | ||
1249 | /* Allocate a new _cpp_file structure. */ | |
1250 | static _cpp_file * | |
bf425849 | 1251 | make_cpp_file (cpp_dir *dir, const char *fname) |
8f9b4009 | 1252 | { |
bf425849 | 1253 | _cpp_file *file = XCNEW (_cpp_file); |
8f9b4009 NB |
1254 | file->fd = -1; |
1255 | file->dir = dir; | |
1256 | file->name = xstrdup (fname); | |
1257 | ||
1258 | return file; | |
1259 | } | |
1260 | ||
1b449375 EB |
1261 | /* Release a _cpp_file structure. */ |
1262 | static void | |
1263 | destroy_cpp_file (_cpp_file *file) | |
1264 | { | |
04695783 | 1265 | free ((void *) file->buffer_start); |
1b449375 | 1266 | free ((void *) file->name); |
f5ea989d | 1267 | free ((void *) file->path); |
1b449375 EB |
1268 | free (file); |
1269 | } | |
1270 | ||
97f6bd40 TT |
1271 | /* Release all the files allocated by this reader. */ |
1272 | static void | |
1273 | destroy_all_cpp_files (cpp_reader *pfile) | |
1274 | { | |
1275 | _cpp_file *iter = pfile->all_files; | |
1276 | while (iter) | |
1277 | { | |
1278 | _cpp_file *next = iter->next_file; | |
1279 | destroy_cpp_file (iter); | |
1280 | iter = next; | |
1281 | } | |
1282 | } | |
1283 | ||
8f9b4009 NB |
1284 | /* A hash of directory names. The directory names are the path names |
1285 | of files which contain a #include "", the included file name is | |
1286 | appended to this directories. | |
1287 | ||
1288 | To avoid duplicate entries we follow the convention that all | |
1289 | non-empty directory names should end in a '/'. DIR_NAME must be | |
1290 | stored in permanently allocated memory. */ | |
1291 | static cpp_dir * | |
1292 | make_cpp_dir (cpp_reader *pfile, const char *dir_name, int sysp) | |
1293 | { | |
d87fc699 | 1294 | struct cpp_file_hash_entry *entry, **hash_slot; |
8f9b4009 NB |
1295 | cpp_dir *dir; |
1296 | ||
d87fc699 | 1297 | hash_slot = (struct cpp_file_hash_entry **) |
a23ee064 | 1298 | htab_find_slot_with_hash (pfile->dir_hash, dir_name, |
b92be669 PB |
1299 | htab_hash_string (dir_name), |
1300 | INSERT); | |
8f9b4009 NB |
1301 | |
1302 | /* Have we already hashed this directory? */ | |
1303 | for (entry = *hash_slot; entry; entry = entry->next) | |
1304 | if (entry->start_dir == NULL) | |
1305 | return entry->u.dir; | |
1306 | ||
c3f829c1 | 1307 | dir = XCNEW (cpp_dir); |
8f9b4009 NB |
1308 | dir->next = pfile->quote_include; |
1309 | dir->name = (char *) dir_name; | |
1310 | dir->len = strlen (dir_name); | |
1311 | dir->sysp = sysp; | |
94d1613b | 1312 | dir->construct = 0; |
8f9b4009 NB |
1313 | |
1314 | /* Store this new result in the hash table. */ | |
1315 | entry = new_file_hash_entry (pfile); | |
1316 | entry->next = *hash_slot; | |
1317 | entry->start_dir = NULL; | |
f1e20710 | 1318 | entry->location = pfile->line_table->highest_location; |
8f9b4009 NB |
1319 | entry->u.dir = dir; |
1320 | *hash_slot = entry; | |
1321 | ||
1322 | return dir; | |
1323 | } | |
1324 | ||
1325 | /* Create a new block of memory for file hash entries. */ | |
1326 | static void | |
1327 | allocate_file_hash_entries (cpp_reader *pfile) | |
1328 | { | |
97f6bd40 TT |
1329 | struct file_hash_entry_pool *pool = XNEW (struct file_hash_entry_pool); |
1330 | pool->file_hash_entries_used = 0; | |
1331 | pool->next = pfile->file_hash_entries; | |
1332 | pfile->file_hash_entries = pool; | |
8f9b4009 NB |
1333 | } |
1334 | ||
1335 | /* Return a new file hash entry. */ | |
d87fc699 | 1336 | static struct cpp_file_hash_entry * |
8f9b4009 NB |
1337 | new_file_hash_entry (cpp_reader *pfile) |
1338 | { | |
97f6bd40 TT |
1339 | unsigned int idx; |
1340 | if (pfile->file_hash_entries->file_hash_entries_used == FILE_HASH_POOL_SIZE) | |
8f9b4009 NB |
1341 | allocate_file_hash_entries (pfile); |
1342 | ||
97f6bd40 TT |
1343 | idx = pfile->file_hash_entries->file_hash_entries_used++; |
1344 | return &pfile->file_hash_entries->pool[idx]; | |
1345 | } | |
1346 | ||
1347 | /* Free the file hash entry pools. */ | |
1348 | static void | |
1349 | free_file_hash_entries (cpp_reader *pfile) | |
1350 | { | |
1351 | struct file_hash_entry_pool *iter = pfile->file_hash_entries; | |
1352 | while (iter) | |
1353 | { | |
1354 | struct file_hash_entry_pool *next = iter->next; | |
1355 | free (iter); | |
1356 | iter = next; | |
1357 | } | |
8f9b4009 NB |
1358 | } |
1359 | ||
1360 | /* Returns TRUE if a file FNAME has ever been successfully opened. | |
1361 | This routine is not intended to correctly handle filenames aliased | |
1362 | by links or redundant . or .. traversals etc. */ | |
1363 | bool | |
1364 | cpp_included (cpp_reader *pfile, const char *fname) | |
1365 | { | |
d87fc699 | 1366 | struct cpp_file_hash_entry *entry; |
8f9b4009 | 1367 | |
d87fc699 | 1368 | entry = (struct cpp_file_hash_entry *) |
c3f829c1 | 1369 | htab_find_with_hash (pfile->file_hash, fname, htab_hash_string (fname)); |
8f9b4009 NB |
1370 | |
1371 | while (entry && (entry->start_dir == NULL || entry->u.file->err_no)) | |
1372 | entry = entry->next; | |
1373 | ||
1374 | return entry != NULL; | |
1375 | } | |
1376 | ||
f1e20710 TT |
1377 | /* Returns TRUE if a file FNAME has ever been successfully opened |
1378 | before LOCATION. This routine is not intended to correctly handle | |
1379 | filenames aliased by links or redundant . or .. traversals etc. */ | |
1380 | bool | |
1381 | cpp_included_before (cpp_reader *pfile, const char *fname, | |
620e594b | 1382 | location_t location) |
f1e20710 | 1383 | { |
53290e07 JJ |
1384 | struct cpp_file_hash_entry *entry |
1385 | = (struct cpp_file_hash_entry *) | |
1386 | htab_find_with_hash (pfile->file_hash, fname, htab_hash_string (fname)); | |
f1e20710 | 1387 | |
53290e07 JJ |
1388 | if (IS_ADHOC_LOC (location)) |
1389 | location = get_location_from_adhoc_loc (pfile->line_table, location); | |
f1e20710 TT |
1390 | |
1391 | while (entry && (entry->start_dir == NULL || entry->u.file->err_no | |
1392 | || entry->location > location)) | |
1393 | entry = entry->next; | |
1394 | ||
1395 | return entry != NULL; | |
1396 | } | |
1397 | ||
6614fd40 | 1398 | /* Calculate the hash value of a file hash entry P. */ |
b92be669 PB |
1399 | |
1400 | static hashval_t | |
1401 | file_hash_hash (const void *p) | |
1402 | { | |
d87fc699 | 1403 | struct cpp_file_hash_entry *entry = (struct cpp_file_hash_entry *) p; |
b92be669 PB |
1404 | const char *hname; |
1405 | if (entry->start_dir) | |
1406 | hname = entry->u.file->name; | |
1407 | else | |
1408 | hname = entry->u.dir->name; | |
1409 | ||
1410 | return htab_hash_string (hname); | |
1411 | } | |
1412 | ||
8f9b4009 NB |
1413 | /* Compare a string Q against a file hash entry P. */ |
1414 | static int | |
b92be669 | 1415 | file_hash_eq (const void *p, const void *q) |
8f9b4009 | 1416 | { |
d87fc699 | 1417 | struct cpp_file_hash_entry *entry = (struct cpp_file_hash_entry *) p; |
8f9b4009 NB |
1418 | const char *fname = (const char *) q; |
1419 | const char *hname; | |
1420 | ||
1421 | if (entry->start_dir) | |
1422 | hname = entry->u.file->name; | |
1423 | else | |
1424 | hname = entry->u.dir->name; | |
1425 | ||
4489800d | 1426 | return filename_cmp (hname, fname) == 0; |
8f9b4009 NB |
1427 | } |
1428 | ||
0b4cafec ILT |
1429 | /* Compare entries in the nonexistent file hash table. These are just |
1430 | strings. */ | |
1431 | static int | |
1432 | nonexistent_file_hash_eq (const void *p, const void *q) | |
1433 | { | |
4489800d | 1434 | return filename_cmp ((const char *) p, (const char *) q) == 0; |
0b4cafec ILT |
1435 | } |
1436 | ||
8f9b4009 NB |
1437 | /* Initialize everything in this source file. */ |
1438 | void | |
1439 | _cpp_init_files (cpp_reader *pfile) | |
1440 | { | |
b92be669 | 1441 | pfile->file_hash = htab_create_alloc (127, file_hash_hash, file_hash_eq, |
8f9b4009 | 1442 | NULL, xcalloc, free); |
a23ee064 AP |
1443 | pfile->dir_hash = htab_create_alloc (127, file_hash_hash, file_hash_eq, |
1444 | NULL, xcalloc, free); | |
8f9b4009 | 1445 | allocate_file_hash_entries (pfile); |
0b4cafec ILT |
1446 | pfile->nonexistent_file_hash = htab_create_alloc (127, htab_hash_string, |
1447 | nonexistent_file_hash_eq, | |
1448 | NULL, xcalloc, free); | |
19a9ba64 AM |
1449 | obstack_specify_allocation (&pfile->nonexistent_file_ob, 0, 0, |
1450 | xmalloc, free); | |
8f9b4009 NB |
1451 | } |
1452 | ||
1453 | /* Finalize everything in this source file. */ | |
1454 | void | |
1455 | _cpp_cleanup_files (cpp_reader *pfile) | |
1456 | { | |
1457 | htab_delete (pfile->file_hash); | |
a23ee064 | 1458 | htab_delete (pfile->dir_hash); |
0b4cafec ILT |
1459 | htab_delete (pfile->nonexistent_file_hash); |
1460 | obstack_free (&pfile->nonexistent_file_ob, 0); | |
97f6bd40 TT |
1461 | free_file_hash_entries (pfile); |
1462 | destroy_all_cpp_files (pfile); | |
1463 | } | |
1464 | ||
1465 | /* Make the parser forget about files it has seen. This can be useful | |
1466 | for resetting the parser to start another run. */ | |
1467 | void | |
1468 | cpp_clear_file_cache (cpp_reader *pfile) | |
1469 | { | |
1470 | _cpp_cleanup_files (pfile); | |
1471 | pfile->file_hash_entries = NULL; | |
1472 | pfile->all_files = NULL; | |
1473 | _cpp_init_files (pfile); | |
8f9b4009 NB |
1474 | } |
1475 | ||
1476 | /* Enter a file name in the hash for the sake of cpp_included. */ | |
1477 | void | |
1478 | _cpp_fake_include (cpp_reader *pfile, const char *fname) | |
1479 | { | |
4623a6f2 | 1480 | _cpp_find_file (pfile, fname, pfile->buffer->file->dir, 0, _cpp_FFK_FAKE, 0); |
add7091b ZW |
1481 | } |
1482 | ||
e605b040 | 1483 | /* Not everyone who wants to set system-header-ness on a buffer can |
642ce434 NB |
1484 | see the details of a buffer. This is an exported interface because |
1485 | fix-header needs it. */ | |
e605b040 | 1486 | void |
6cf87ca4 | 1487 | cpp_make_system_header (cpp_reader *pfile, int syshdr, int externc) |
e605b040 | 1488 | { |
614c7d37 | 1489 | int flags = 0; |
99b1c316 | 1490 | const class line_maps *line_table = pfile->line_table; |
0e50b624 | 1491 | const line_map_ordinary *map = LINEMAPS_LAST_ORDINARY_MAP (line_table); |
614c7d37 NB |
1492 | /* 1 = system header, 2 = system header to be treated as C. */ |
1493 | if (syshdr) | |
1494 | flags = 1 + (externc != 0); | |
12f9df4e | 1495 | pfile->buffer->sysp = flags; |
46427374 | 1496 | _cpp_do_file_change (pfile, LC_RENAME, ORDINARY_MAP_FILE_NAME (map), |
4623a6f2 NS |
1497 | SOURCE_LINE (map, pfile->line_table->highest_line), |
1498 | flags); | |
e605b040 ZW |
1499 | } |
1500 | ||
b4e46cea PB |
1501 | /* Allow the client to change the current file. Used by the front end |
1502 | to achieve pseudo-file names like <built-in>. | |
1503 | If REASON is LC_LEAVE, then NEW_NAME must be NULL. */ | |
c19b12cb | 1504 | void |
6cf87ca4 ZW |
1505 | cpp_change_file (cpp_reader *pfile, enum lc_reason reason, |
1506 | const char *new_name) | |
c19b12cb | 1507 | { |
b4e46cea | 1508 | _cpp_do_file_change (pfile, reason, new_name, 1, 0); |
c19b12cb NB |
1509 | } |
1510 | ||
affa55c6 JJ |
1511 | struct report_missing_guard_data |
1512 | { | |
bf425849 | 1513 | cpp_reader *pfile; |
affa55c6 JJ |
1514 | const char **paths; |
1515 | size_t count; | |
1516 | }; | |
1517 | ||
8f9b4009 | 1518 | /* Callback function for htab_traverse. */ |
c71f835b | 1519 | static int |
affa55c6 | 1520 | report_missing_guard (void **slot, void *d) |
c71f835b | 1521 | { |
d87fc699 | 1522 | struct cpp_file_hash_entry *entry = (struct cpp_file_hash_entry *) *slot; |
affa55c6 JJ |
1523 | struct report_missing_guard_data *data |
1524 | = (struct report_missing_guard_data *) d; | |
c71f835b | 1525 | |
8f9b4009 NB |
1526 | /* Skip directories. */ |
1527 | if (entry->start_dir != NULL) | |
c71f835b | 1528 | { |
8f9b4009 NB |
1529 | _cpp_file *file = entry->u.file; |
1530 | ||
1531 | /* We don't want MI guard advice for the main file. */ | |
bf425849 NS |
1532 | if (!file->once_only |
1533 | && file->cmacro == NULL | |
1534 | && file->stack_count == 1 | |
1535 | && data->pfile->main_file != file) | |
c71f835b | 1536 | { |
affa55c6 | 1537 | if (data->paths == NULL) |
8f9b4009 | 1538 | { |
affa55c6 JJ |
1539 | data->paths = XCNEWVEC (const char *, data->count); |
1540 | data->count = 0; | |
8f9b4009 NB |
1541 | } |
1542 | ||
affa55c6 | 1543 | data->paths[data->count++] = file->path; |
c71f835b | 1544 | } |
c71f835b | 1545 | } |
c71f835b | 1546 | |
affa55c6 JJ |
1547 | /* Keep traversing the hash table. */ |
1548 | return 1; | |
1549 | } | |
1550 | ||
1551 | /* Comparison function for qsort. */ | |
1552 | static int | |
1553 | report_missing_guard_cmp (const void *p1, const void *p2) | |
1554 | { | |
1555 | return strcmp (*(const char *const *) p1, *(const char *const *) p2); | |
a36c54fa NB |
1556 | } |
1557 | ||
8f9b4009 NB |
1558 | /* Report on all files that might benefit from a multiple include guard. |
1559 | Triggered by -H. */ | |
1560 | void | |
1561 | _cpp_report_missing_guards (cpp_reader *pfile) | |
168d3732 | 1562 | { |
affa55c6 JJ |
1563 | struct report_missing_guard_data data; |
1564 | ||
bf425849 | 1565 | data.pfile = pfile; |
affa55c6 JJ |
1566 | data.paths = NULL; |
1567 | data.count = htab_elements (pfile->file_hash); | |
1568 | htab_traverse (pfile->file_hash, report_missing_guard, &data); | |
ba133c96 | 1569 | |
affa55c6 JJ |
1570 | if (data.paths != NULL) |
1571 | { | |
1572 | size_t i; | |
1573 | ||
1574 | /* Sort the paths to avoid outputting them in hash table | |
1575 | order. */ | |
1576 | qsort (data.paths, data.count, sizeof (const char *), | |
1577 | report_missing_guard_cmp); | |
1578 | fputs (_("Multiple include guards may be useful for:\n"), | |
1579 | stderr); | |
1580 | for (i = 0; i < data.count; i++) | |
1581 | { | |
1582 | fputs (data.paths[i], stderr); | |
1583 | putc ('\n', stderr); | |
1584 | } | |
1585 | free (data.paths); | |
1586 | } | |
168d3732 ZW |
1587 | } |
1588 | ||
41947a54 | 1589 | /* Locate HEADER, and determine whether it is newer than the current |
48c4721e | 1590 | file. If it cannot be located or dated, return -1, if it is |
41947a54 | 1591 | newer, return 1, otherwise 0. */ |
f3f751ad | 1592 | int |
6cf87ca4 ZW |
1593 | _cpp_compare_file_date (cpp_reader *pfile, const char *fname, |
1594 | int angle_brackets) | |
f3f751ad | 1595 | { |
8f9b4009 NB |
1596 | _cpp_file *file; |
1597 | struct cpp_dir *dir; | |
df383483 | 1598 | |
8f9b4009 NB |
1599 | dir = search_path_head (pfile, fname, angle_brackets, IT_INCLUDE); |
1600 | if (!dir) | |
f3f751ad | 1601 | return -1; |
41947a54 | 1602 | |
4623a6f2 | 1603 | file = _cpp_find_file (pfile, fname, dir, angle_brackets, _cpp_FFK_NORMAL, 0); |
8f9b4009 NB |
1604 | if (file->err_no) |
1605 | return -1; | |
c45da1ca | 1606 | |
8f9b4009 | 1607 | if (file->fd != -1) |
c0bfe993 | 1608 | { |
8f9b4009 NB |
1609 | close (file->fd); |
1610 | file->fd = -1; | |
c0bfe993 | 1611 | } |
041c3194 | 1612 | |
8f9b4009 | 1613 | return file->st.st_mtime > pfile->buffer->file->st.st_mtime; |
f8f769ea ZW |
1614 | } |
1615 | ||
c19b12cb NB |
1616 | /* Pushes the given file onto the buffer stack. Returns nonzero if |
1617 | successful. */ | |
1618 | bool | |
8f9b4009 | 1619 | cpp_push_include (cpp_reader *pfile, const char *fname) |
c19b12cb | 1620 | { |
6bf2ff0d NS |
1621 | return _cpp_stack_include (pfile, fname, false, IT_CMDLINE, |
1622 | pfile->line_table->highest_line); | |
c19b12cb NB |
1623 | } |
1624 | ||
1efcb8c6 JM |
1625 | /* Pushes the given file, implicitly included at the start of a |
1626 | compilation, onto the buffer stack but without any errors if the | |
1627 | file is not found. Returns nonzero if successful. */ | |
1628 | bool | |
1629 | cpp_push_default_include (cpp_reader *pfile, const char *fname) | |
1630 | { | |
6bf2ff0d NS |
1631 | return _cpp_stack_include (pfile, fname, true, IT_DEFAULT, |
1632 | pfile->line_table->highest_line); | |
1efcb8c6 JM |
1633 | } |
1634 | ||
5d8ebbd8 | 1635 | /* Do appropriate cleanup when a file INC's buffer is popped off the |
af0d16cd NB |
1636 | input stack. */ |
1637 | void | |
28937f11 JJ |
1638 | _cpp_pop_file_buffer (cpp_reader *pfile, _cpp_file *file, |
1639 | const unsigned char *to_free) | |
f9a0e96c | 1640 | { |
ba133c96 | 1641 | /* Record the inclusion-preventing macro, which could be NULL |
6d18adbc | 1642 | meaning no controlling macro. */ |
8f9b4009 NB |
1643 | if (pfile->mi_valid && file->cmacro == NULL) |
1644 | file->cmacro = pfile->mi_cmacro; | |
93c80368 NB |
1645 | |
1646 | /* Invalidate control macros in the #including file. */ | |
6d18adbc | 1647 | pfile->mi_valid = false; |
f9a0e96c | 1648 | |
28937f11 | 1649 | if (to_free) |
8f9b4009 | 1650 | { |
28937f11 JJ |
1651 | if (to_free == file->buffer_start) |
1652 | { | |
1653 | file->buffer_start = NULL; | |
1654 | file->buffer = NULL; | |
1655 | file->buffer_valid = false; | |
1656 | } | |
1657 | free ((void *) to_free); | |
8f9b4009 | 1658 | } |
f9a0e96c ZW |
1659 | } |
1660 | ||
b492b686 GF |
1661 | /* Return the file name associated with FILE. */ |
1662 | const char * | |
1663 | _cpp_get_file_name (_cpp_file *file) | |
1664 | { | |
1665 | return file->name; | |
1666 | } | |
1667 | ||
be8ac3e2 GZ |
1668 | /* Inteface to file statistics record in _cpp_file structure. */ |
1669 | struct stat * | |
1670 | _cpp_get_file_stat (_cpp_file *file) | |
1671 | { | |
1672 | return &file->st; | |
1673 | } | |
1674 | ||
8f9b4009 NB |
1675 | /* Set the include chain for "" to QUOTE, for <> to BRACKET. If |
1676 | QUOTE_IGNORES_SOURCE_DIR, then "" includes do not look in the | |
1677 | directory of the including file. | |
ba133c96 | 1678 | |
8f9b4009 NB |
1679 | If BRACKET does not lie in the QUOTE chain, it is set to QUOTE. */ |
1680 | void | |
1681 | cpp_set_include_chains (cpp_reader *pfile, cpp_dir *quote, cpp_dir *bracket, | |
1682 | int quote_ignores_source_dir) | |
591e15a1 | 1683 | { |
8f9b4009 NB |
1684 | pfile->quote_include = quote; |
1685 | pfile->bracket_include = quote; | |
1686 | pfile->quote_ignores_source_dir = quote_ignores_source_dir; | |
591e15a1 | 1687 | |
8f9b4009 | 1688 | for (; quote; quote = quote->next) |
591e15a1 | 1689 | { |
8f9b4009 NB |
1690 | quote->name_map = NULL; |
1691 | quote->len = strlen (quote->name); | |
1692 | if (quote == bracket) | |
1693 | pfile->bracket_include = bracket; | |
ba133c96 | 1694 | } |
591e15a1 NB |
1695 | } |
1696 | ||
8f9b4009 NB |
1697 | /* Append the file name to the directory to create the path, but don't |
1698 | turn / into // or // into ///; // may be a namespace escape. */ | |
1699 | static char * | |
1700 | append_file_to_dir (const char *fname, cpp_dir *dir) | |
1701 | { | |
1702 | size_t dlen, flen; | |
1703 | char *path; | |
1704 | ||
1705 | dlen = dir->len; | |
1706 | flen = strlen (fname); | |
c3f829c1 | 1707 | path = XNEWVEC (char, dlen + 1 + flen + 1); |
8f9b4009 | 1708 | memcpy (path, dir->name, dlen); |
4489800d | 1709 | if (dlen && !IS_DIR_SEPARATOR (path[dlen - 1])) |
8f9b4009 NB |
1710 | path[dlen++] = '/'; |
1711 | memcpy (&path[dlen], fname, flen + 1); | |
1712 | ||
1713 | return path; | |
1714 | } | |
c31a6508 ZW |
1715 | |
1716 | /* Read a space delimited string of unlimited length from a stdio | |
5d8ebbd8 | 1717 | file F. */ |
c31a6508 | 1718 | static char * |
6cf87ca4 | 1719 | read_filename_string (int ch, FILE *f) |
c31a6508 ZW |
1720 | { |
1721 | char *alloc, *set; | |
1722 | int len; | |
1723 | ||
1724 | len = 20; | |
c3f829c1 | 1725 | set = alloc = XNEWVEC (char, len + 1); |
dc65cd60 | 1726 | if (! is_space (ch)) |
c31a6508 ZW |
1727 | { |
1728 | *set++ = ch; | |
dc65cd60 | 1729 | while ((ch = getc (f)) != EOF && ! is_space (ch)) |
c31a6508 ZW |
1730 | { |
1731 | if (set - alloc == len) | |
1732 | { | |
1733 | len *= 2; | |
c3f829c1 | 1734 | alloc = XRESIZEVEC (char, alloc, len + 1); |
c31a6508 ZW |
1735 | set = alloc + len / 2; |
1736 | } | |
1737 | *set++ = ch; | |
1738 | } | |
1739 | } | |
1740 | *set = '\0'; | |
1741 | ungetc (ch, f); | |
1742 | return alloc; | |
1743 | } | |
1744 | ||
8f9b4009 NB |
1745 | /* Read the file name map file for DIR. */ |
1746 | static void | |
1747 | read_name_map (cpp_dir *dir) | |
c31a6508 | 1748 | { |
8f9b4009 | 1749 | static const char FILE_NAME_MAP_FILE[] = "header.gcc"; |
c31a6508 ZW |
1750 | char *name; |
1751 | FILE *f; | |
8f9b4009 NB |
1752 | size_t len, count = 0, room = 9; |
1753 | ||
1754 | len = dir->len; | |
c3f829c1 | 1755 | name = (char *) alloca (len + sizeof (FILE_NAME_MAP_FILE) + 1); |
8f9b4009 | 1756 | memcpy (name, dir->name, len); |
4489800d | 1757 | if (len && !IS_DIR_SEPARATOR (name[len - 1])) |
8f9b4009 NB |
1758 | name[len++] = '/'; |
1759 | strcpy (name + len, FILE_NAME_MAP_FILE); | |
c31a6508 | 1760 | f = fopen (name, "r"); |
8767c894 | 1761 | |
c3f829c1 | 1762 | dir->name_map = XNEWVEC (const char *, room); |
8f9b4009 | 1763 | |
8767c894 NB |
1764 | /* Silently return NULL if we cannot open. */ |
1765 | if (f) | |
c31a6508 ZW |
1766 | { |
1767 | int ch; | |
c31a6508 ZW |
1768 | |
1769 | while ((ch = getc (f)) != EOF) | |
1770 | { | |
8f9b4009 | 1771 | char *to; |
c31a6508 | 1772 | |
dc65cd60 | 1773 | if (is_space (ch)) |
c31a6508 | 1774 | continue; |
8f9b4009 NB |
1775 | |
1776 | if (count + 2 > room) | |
1777 | { | |
1778 | room += 8; | |
c3f829c1 | 1779 | dir->name_map = XRESIZEVEC (const char *, dir->name_map, room); |
8f9b4009 NB |
1780 | } |
1781 | ||
1782 | dir->name_map[count] = read_filename_string (ch, f); | |
dc65cd60 | 1783 | while ((ch = getc (f)) != EOF && is_hspace (ch)) |
c31a6508 | 1784 | ; |
c31a6508 | 1785 | |
8f9b4009 | 1786 | to = read_filename_string (ch, f); |
3dce1408 | 1787 | if (IS_ABSOLUTE_PATH (to)) |
8f9b4009 | 1788 | dir->name_map[count + 1] = to; |
c31a6508 ZW |
1789 | else |
1790 | { | |
8f9b4009 | 1791 | dir->name_map[count + 1] = append_file_to_dir (to, dir); |
c31a6508 | 1792 | free (to); |
df383483 | 1793 | } |
c31a6508 | 1794 | |
8f9b4009 | 1795 | count += 2; |
c31a6508 ZW |
1796 | while ((ch = getc (f)) != '\n') |
1797 | if (ch == EOF) | |
1798 | break; | |
1799 | } | |
8f9b4009 | 1800 | |
c31a6508 ZW |
1801 | fclose (f); |
1802 | } | |
df383483 | 1803 | |
8f9b4009 NB |
1804 | /* Terminate the list of maps. */ |
1805 | dir->name_map[count] = NULL; | |
df383483 | 1806 | } |
c31a6508 | 1807 | |
8f9b4009 NB |
1808 | /* Remap a FILE's name based on the file_name_map, if any, for |
1809 | FILE->dir. If the file name has any directory separators, | |
1810 | recursively check those directories too. */ | |
c31a6508 | 1811 | static char * |
8f9b4009 | 1812 | remap_filename (cpp_reader *pfile, _cpp_file *file) |
c31a6508 | 1813 | { |
8f9b4009 | 1814 | const char *fname, *p; |
58f30963 | 1815 | char *new_dir, *p3; |
8f9b4009 NB |
1816 | cpp_dir *dir; |
1817 | size_t index, len; | |
8767c894 | 1818 | |
8f9b4009 NB |
1819 | dir = file->dir; |
1820 | fname = file->name; | |
df383483 | 1821 | |
8f9b4009 NB |
1822 | for (;;) |
1823 | { | |
1824 | if (!dir->name_map) | |
1825 | read_name_map (dir); | |
c31a6508 | 1826 | |
8f9b4009 | 1827 | for (index = 0; dir->name_map[index]; index += 2) |
4489800d | 1828 | if (!filename_cmp (dir->name_map[index], fname)) |
8f9b4009 | 1829 | return xstrdup (dir->name_map[index + 1]); |
4489800d KT |
1830 | if (IS_ABSOLUTE_PATH (fname)) |
1831 | return NULL; | |
8f9b4009 | 1832 | p = strchr (fname, '/'); |
4489800d KT |
1833 | #ifdef HAVE_DOS_BASED_FILE_SYSTEM |
1834 | { | |
3fe3efe5 | 1835 | const char *p2 = strchr (fname, '\\'); |
711f56ad | 1836 | if (!p || (p2 && p > p2)) |
4489800d KT |
1837 | p = p2; |
1838 | } | |
1839 | #endif | |
8f9b4009 NB |
1840 | if (!p || p == fname) |
1841 | return NULL; | |
f9200da2 | 1842 | |
8f9b4009 | 1843 | len = dir->len + (p - fname + 1); |
58f30963 AP |
1844 | new_dir = XNEWVEC (char, len + 2); |
1845 | p3 = new_dir + dir->len; | |
8f9b4009 | 1846 | memcpy (new_dir, dir->name, dir->len); |
58f30963 AP |
1847 | if (dir->len && !IS_DIR_SEPARATOR (dir->name[dir->len - 1])) |
1848 | { | |
1849 | *p3++ = '/'; | |
1850 | len++; | |
1851 | } | |
1852 | memcpy (p3, fname, p - fname + 1); | |
8f9b4009 | 1853 | new_dir[len] = '\0'; |
df383483 | 1854 | |
8f9b4009 NB |
1855 | dir = make_cpp_dir (pfile, new_dir, dir->sysp); |
1856 | fname = p + 1; | |
0b3d776a | 1857 | } |
0b3d776a | 1858 | } |
986b1f13 | 1859 | |
8f9b4009 NB |
1860 | /* Returns true if PCHNAME is a valid PCH file for FILE. */ |
1861 | static bool | |
1862 | validate_pch (cpp_reader *pfile, _cpp_file *file, const char *pchname) | |
986b1f13 | 1863 | { |
8f9b4009 | 1864 | const char *saved_path = file->path; |
230fcd32 | 1865 | bool valid = false; |
986b1f13 | 1866 | |
8f9b4009 NB |
1867 | file->path = pchname; |
1868 | if (open_file (file)) | |
986b1f13 | 1869 | { |
230fcd32 | 1870 | valid = 1 & pfile->cb.valid_pch (pfile, pchname, file->fd); |
8f9b4009 | 1871 | |
230fcd32 | 1872 | if (!valid) |
986b1f13 | 1873 | { |
8f9b4009 NB |
1874 | close (file->fd); |
1875 | file->fd = -1; | |
986b1f13 | 1876 | } |
986b1f13 | 1877 | |
8f9b4009 | 1878 | if (CPP_OPTION (pfile, print_include_names)) |
986b1f13 | 1879 | { |
8f9b4009 | 1880 | unsigned int i; |
54020b29 | 1881 | for (i = 1; i < pfile->line_table->depth; i++) |
8f9b4009 NB |
1882 | putc ('.', stderr); |
1883 | fprintf (stderr, "%c %s\n", | |
230fcd32 | 1884 | valid ? '!' : 'x', pchname); |
986b1f13 | 1885 | } |
986b1f13 NB |
1886 | } |
1887 | ||
8f9b4009 | 1888 | file->path = saved_path; |
230fcd32 | 1889 | return valid; |
986b1f13 | 1890 | } |
94d1613b MS |
1891 | |
1892 | /* Get the path associated with the _cpp_file F. The path includes | |
1893 | the base name from the include directive and the directory it was | |
1894 | found in via the search path. */ | |
1895 | ||
1896 | const char * | |
1897 | cpp_get_path (struct _cpp_file *f) | |
1898 | { | |
1899 | return f->path; | |
1900 | } | |
1901 | ||
e3c287c9 MS |
1902 | /* Get the directory associated with the _cpp_file F. */ |
1903 | ||
1904 | cpp_dir * | |
1905 | cpp_get_dir (struct _cpp_file *f) | |
1906 | { | |
1907 | return f->dir; | |
1908 | } | |
1909 | ||
94d1613b MS |
1910 | /* Get the cpp_buffer currently associated with the cpp_reader |
1911 | PFILE. */ | |
1912 | ||
1913 | cpp_buffer * | |
1914 | cpp_get_buffer (cpp_reader *pfile) | |
1915 | { | |
1916 | return pfile->buffer; | |
1917 | } | |
1918 | ||
1919 | /* Get the _cpp_file associated with the cpp_buffer B. */ | |
1920 | ||
1921 | _cpp_file * | |
1922 | cpp_get_file (cpp_buffer *b) | |
1923 | { | |
1924 | return b->file; | |
1925 | } | |
1926 | ||
1927 | /* Get the previous cpp_buffer given a cpp_buffer B. The previous | |
1928 | buffer is the buffer that included the given buffer. */ | |
1929 | ||
1930 | cpp_buffer * | |
1931 | cpp_get_prev (cpp_buffer *b) | |
1932 | { | |
1933 | return b->prev; | |
1934 | } | |
73e61092 | 1935 | \f |
1ae58c30 | 1936 | /* This data structure holds the list of header files that were seen |
73e61092 GK |
1937 | while the PCH was being built. The 'entries' field is kept sorted |
1938 | in memcmp() order; yes, this means that on little-endian systems, | |
1939 | it's sorted initially by the least-significant byte of 'size', but | |
1940 | that's OK. The code does rely on having entries with the same size | |
1941 | next to each other. */ | |
1942 | ||
c3f829c1 GDR |
1943 | struct pchf_entry { |
1944 | /* The size of this file. This is used to save running a MD5 checksum | |
1945 | if the sizes don't match. */ | |
1946 | off_t size; | |
1947 | /* The MD5 checksum of this file. */ | |
1948 | unsigned char sum[16]; | |
1949 | /* Is this file to be included only once? */ | |
1950 | bool once_only; | |
1951 | }; | |
1952 | ||
73e61092 GK |
1953 | struct pchf_data { |
1954 | /* Number of pchf_entry structures. */ | |
1955 | size_t count; | |
1956 | ||
1957 | /* Are there any values with once_only set? | |
1958 | This is used as an optimisation, it means we don't have to search | |
1959 | the structure if we're processing a regular #include. */ | |
1960 | bool have_once_only; | |
16dd5cfe | 1961 | |
c3f829c1 | 1962 | struct pchf_entry entries[1]; |
73e61092 GK |
1963 | }; |
1964 | ||
1965 | static struct pchf_data *pchf; | |
1966 | ||
ecddfb39 MS |
1967 | /* A qsort ordering function for pchf_entry structures. */ |
1968 | ||
1969 | static int | |
1970 | pchf_save_compare (const void *e1, const void *e2) | |
73e61092 | 1971 | { |
ecddfb39 MS |
1972 | return memcmp (e1, e2, sizeof (struct pchf_entry)); |
1973 | } | |
73e61092 | 1974 | |
ecddfb39 | 1975 | /* Create and write to F a pchf_data structure. */ |
73e61092 | 1976 | |
ecddfb39 MS |
1977 | bool |
1978 | _cpp_save_file_entries (cpp_reader *pfile, FILE *fp) | |
73e61092 | 1979 | { |
ecddfb39 MS |
1980 | size_t count = 0; |
1981 | struct pchf_data *result; | |
1982 | size_t result_size; | |
1983 | _cpp_file *f; | |
3b8af25b | 1984 | bool ret; |
73e61092 | 1985 | |
ecddfb39 MS |
1986 | for (f = pfile->all_files; f; f = f->next_file) |
1987 | ++count; | |
1988 | ||
1989 | result_size = (sizeof (struct pchf_data) | |
1990 | + sizeof (struct pchf_entry) * (count - 1)); | |
c3f829c1 | 1991 | result = XCNEWVAR (struct pchf_data, result_size); |
ecddfb39 MS |
1992 | |
1993 | result->count = 0; | |
1994 | result->have_once_only = false; | |
1995 | ||
1996 | for (f = pfile->all_files; f; f = f->next_file) | |
73e61092 | 1997 | { |
ecddfb39 | 1998 | size_t count; |
73e61092 GK |
1999 | |
2000 | /* This should probably never happen, since if a read error occurred | |
2001 | the PCH file shouldn't be written... */ | |
2002 | if (f->dont_read || f->err_no) | |
ecddfb39 MS |
2003 | continue; |
2004 | ||
2005 | if (f->stack_count == 0) | |
2006 | continue; | |
16dd5cfe | 2007 | |
ecddfb39 MS |
2008 | count = result->count++; |
2009 | ||
2010 | result->entries[count].once_only = f->once_only; | |
97d62313 | 2011 | /* |= is avoided in the next line because of an HP C compiler bug */ |
ecddfb39 | 2012 | result->have_once_only = result->have_once_only | f->once_only; |
73e61092 | 2013 | if (f->buffer_valid) |
ecddfb39 MS |
2014 | md5_buffer ((const char *)f->buffer, |
2015 | f->st.st_size, result->entries[count].sum); | |
73e61092 GK |
2016 | else |
2017 | { | |
2018 | FILE *ff; | |
2019 | int oldfd = f->fd; | |
2020 | ||
2021 | if (!open_file (f)) | |
2022 | { | |
ac81cf0b | 2023 | open_file_failed (pfile, f, 0, 0); |
55e7f907 | 2024 | free (result); |
ecddfb39 | 2025 | return false; |
73e61092 GK |
2026 | } |
2027 | ff = fdopen (f->fd, "rb"); | |
ecddfb39 | 2028 | md5_stream (ff, result->entries[count].sum); |
73e61092 GK |
2029 | fclose (ff); |
2030 | f->fd = oldfd; | |
2031 | } | |
ecddfb39 | 2032 | result->entries[count].size = f->st.st_size; |
73e61092 | 2033 | } |
73e61092 GK |
2034 | |
2035 | result_size = (sizeof (struct pchf_data) | |
2036 | + sizeof (struct pchf_entry) * (result->count - 1)); | |
16dd5cfe | 2037 | |
73e61092 GK |
2038 | qsort (result->entries, result->count, sizeof (struct pchf_entry), |
2039 | pchf_save_compare); | |
2040 | ||
3b8af25b JJ |
2041 | ret = fwrite (result, result_size, 1, fp) == 1; |
2042 | free (result); | |
2043 | return ret; | |
73e61092 GK |
2044 | } |
2045 | ||
2046 | /* Read the pchf_data structure from F. */ | |
2047 | ||
2048 | bool | |
2049 | _cpp_read_file_entries (cpp_reader *pfile ATTRIBUTE_UNUSED, FILE *f) | |
2050 | { | |
2051 | struct pchf_data d; | |
16dd5cfe | 2052 | |
73e61092 GK |
2053 | if (fread (&d, sizeof (struct pchf_data) - sizeof (struct pchf_entry), 1, f) |
2054 | != 1) | |
2055 | return false; | |
16dd5cfe | 2056 | |
c3f829c1 | 2057 | pchf = XNEWVAR (struct pchf_data, sizeof (struct pchf_data) |
73e61092 GK |
2058 | + sizeof (struct pchf_entry) * (d.count - 1)); |
2059 | memcpy (pchf, &d, sizeof (struct pchf_data) - sizeof (struct pchf_entry)); | |
2060 | if (fread (pchf->entries, sizeof (struct pchf_entry), d.count, f) | |
2061 | != d.count) | |
2062 | return false; | |
2063 | return true; | |
2064 | } | |
2065 | ||
2066 | /* The parameters for pchf_compare. */ | |
2067 | ||
2068 | struct pchf_compare_data | |
2069 | { | |
2070 | /* The size of the file we're looking for. */ | |
2071 | off_t size; | |
2072 | ||
2073 | /* The MD5 checksum of the file, if it's been computed. */ | |
2074 | unsigned char sum[16]; | |
2075 | ||
2076 | /* Is SUM valid? */ | |
2077 | bool sum_computed; | |
2078 | ||
2079 | /* Do we need to worry about entries that don't have ONCE_ONLY set? */ | |
2080 | bool check_included; | |
16dd5cfe | 2081 | |
73e61092 GK |
2082 | /* The file that we're searching for. */ |
2083 | _cpp_file *f; | |
2084 | }; | |
2085 | ||
2086 | /* bsearch comparison function; look for D_P in E_P. */ | |
2087 | ||
2088 | static int | |
2089 | pchf_compare (const void *d_p, const void *e_p) | |
2090 | { | |
2091 | const struct pchf_entry *e = (const struct pchf_entry *)e_p; | |
2092 | struct pchf_compare_data *d = (struct pchf_compare_data *)d_p; | |
2093 | int result; | |
16dd5cfe | 2094 | |
73e61092 GK |
2095 | result = memcmp (&d->size, &e->size, sizeof (off_t)); |
2096 | if (result != 0) | |
2097 | return result; | |
16dd5cfe | 2098 | |
73e61092 GK |
2099 | if (! d->sum_computed) |
2100 | { | |
2101 | _cpp_file *const f = d->f; | |
16dd5cfe | 2102 | |
73e61092 GK |
2103 | md5_buffer ((const char *)f->buffer, f->st.st_size, d->sum); |
2104 | d->sum_computed = true; | |
2105 | } | |
2106 | ||
2107 | result = memcmp (d->sum, e->sum, 16); | |
2108 | if (result != 0) | |
2109 | return result; | |
2110 | ||
2111 | if (d->check_included || e->once_only) | |
2112 | return 0; | |
2113 | else | |
2114 | return 1; | |
2115 | } | |
2116 | ||
16dd5cfe | 2117 | /* Check that F is not in a list read from a PCH file (if any). |
73e61092 GK |
2118 | Assumes that f->buffer_valid is true. Return TRUE if the file |
2119 | should not be read. */ | |
2120 | ||
2121 | static bool | |
2122 | check_file_against_entries (cpp_reader *pfile ATTRIBUTE_UNUSED, | |
2123 | _cpp_file *f, | |
2124 | bool check_included) | |
2125 | { | |
2126 | struct pchf_compare_data d; | |
16dd5cfe | 2127 | |
73e61092 GK |
2128 | if (pchf == NULL |
2129 | || (! check_included && ! pchf->have_once_only)) | |
2130 | return false; | |
2131 | ||
2132 | d.size = f->st.st_size; | |
2133 | d.sum_computed = false; | |
2134 | d.f = f; | |
2135 | d.check_included = check_included; | |
2136 | return bsearch (&d, pchf->entries, pchf->count, sizeof (struct pchf_entry), | |
2137 | pchf_compare) != NULL; | |
2138 | } | |
a15f7cb8 ESR |
2139 | |
2140 | /* Return true if the file FNAME is found in the appropriate include file path | |
2141 | as indicated by ANGLE_BRACKETS. */ | |
2142 | ||
2143 | bool | |
2144 | _cpp_has_header (cpp_reader *pfile, const char *fname, int angle_brackets, | |
2145 | enum include_type type) | |
2146 | { | |
2147 | cpp_dir *start_dir = search_path_head (pfile, fname, angle_brackets, type); | |
ad1a3914 | 2148 | _cpp_file *file = _cpp_find_file (pfile, fname, start_dir, angle_brackets, |
4623a6f2 | 2149 | _cpp_FFK_HAS_INCLUDE, 0); |
a15f7cb8 ESR |
2150 | return file->err_no != ENOENT; |
2151 | } | |
2152 | ||
3ac6b5cf LH |
2153 | /* Read a file and convert to input charset, the same as if it were being read |
2154 | by a cpp_reader. */ | |
2155 | ||
2156 | cpp_converted_source | |
2157 | cpp_get_converted_source (const char *fname, const char *input_charset) | |
2158 | { | |
2159 | cpp_converted_source res = {}; | |
2160 | _cpp_file file = {}; | |
2161 | file.fd = -1; | |
2162 | file.name = lbasename (fname); | |
2163 | file.path = fname; | |
2164 | if (!open_file (&file)) | |
2165 | return res; | |
2166 | const bool ok = read_file_guts (NULL, &file, 0, input_charset); | |
2167 | close (file.fd); | |
2168 | if (!ok) | |
2169 | return res; | |
2170 | res.to_free = (char *) file.buffer_start; | |
2171 | res.data = (char *) file.buffer; | |
2172 | res.len = file.st.st_size; | |
2173 | return res; | |
2174 | } |