Mercurial > hg > CbC > CbC_gcc
annotate libcpp/files.c @ 74:f26ecf70364b
modify c-decl.c, c-parser.c, c-tree.h and tree.h
| author | Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> |
|---|---|
| date | Mon, 22 Aug 2011 03:31:39 +0900 |
| parents | f6334be47118 |
| children | 04ced10e8804 |
| rev | line source |
|---|---|
| 0 | 1 /* Part of CPP library. File handling. |
| 2 Copyright (C) 1986, 1987, 1989, 1992, 1993, 1994, 1995, 1998, | |
|
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3 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 |
| 0 | 4 Free Software Foundation, Inc. |
| 5 Written by Per Bothner, 1994. | |
| 6 Based on CCCP program by Paul Rubin, June 1986 | |
| 7 Adapted to ANSI C, Richard Stallman, Jan 1987 | |
| 8 Split out of cpplib.c, Zack Weinberg, Oct 1998 | |
| 9 Reimplemented, Neil Booth, Jul 2003 | |
| 10 | |
| 11 This program is free software; you can redistribute it and/or modify it | |
| 12 under the terms of the GNU General Public License as published by the | |
| 13 Free Software Foundation; either version 3, or (at your option) any | |
| 14 later version. | |
| 15 | |
| 16 This program is distributed in the hope that it will be useful, | |
| 17 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 19 GNU General Public License for more details. | |
| 20 | |
| 21 You should have received a copy of the GNU General Public License | |
| 22 along with this program; see the file COPYING3. If not see | |
| 23 <http://www.gnu.org/licenses/>. */ | |
| 24 | |
| 25 #include "config.h" | |
| 26 #include "system.h" | |
| 27 #include "cpplib.h" | |
| 28 #include "internal.h" | |
| 29 #include "mkdeps.h" | |
| 30 #include "obstack.h" | |
| 31 #include "hashtab.h" | |
| 32 #include "md5.h" | |
| 33 #include <dirent.h> | |
| 34 | |
| 35 /* Variable length record files on VMS will have a stat size that includes | |
| 36 record control characters that won't be included in the read size. */ | |
| 37 #ifdef VMS | |
| 38 # define FAB_C_VAR 2 /* variable length records (see Starlet fabdef.h) */ | |
| 39 # define STAT_SIZE_RELIABLE(ST) ((ST).st_fab_rfm != FAB_C_VAR) | |
| 40 #else | |
| 41 # define STAT_SIZE_RELIABLE(ST) true | |
| 42 #endif | |
| 43 | |
| 44 #ifdef __DJGPP__ | |
| 45 #include <io.h> | |
| 46 /* For DJGPP redirected input is opened in text mode. */ | |
| 47 # define set_stdin_to_binary_mode() \ | |
| 48 if (! isatty (0)) setmode (0, O_BINARY) | |
| 49 #else | |
| 50 # define set_stdin_to_binary_mode() /* Nothing */ | |
| 51 #endif | |
| 52 | |
| 53 /* This structure represents a file searched for by CPP, whether it | |
| 54 exists or not. An instance may be pointed to by more than one | |
| 55 file_hash_entry; at present no reference count is kept. */ | |
| 56 struct _cpp_file | |
| 57 { | |
| 58 /* Filename as given to #include or command line switch. */ | |
| 59 const char *name; | |
| 60 | |
| 61 /* The full path used to find the file. */ | |
| 62 const char *path; | |
| 63 | |
| 64 /* The full path of the pch file. */ | |
| 65 const char *pchname; | |
| 66 | |
| 67 /* The file's path with the basename stripped. NULL if it hasn't | |
| 68 been calculated yet. */ | |
| 69 const char *dir_name; | |
| 70 | |
| 71 /* Chain through all files. */ | |
| 72 struct _cpp_file *next_file; | |
| 73 | |
| 74 /* The contents of NAME after calling read_file(). */ | |
| 75 const uchar *buffer; | |
| 76 | |
| 77 /* Pointer to the real start of BUFFER. read_file() might increment | |
| 78 BUFFER; when freeing, this this pointer must be used instead. */ | |
| 79 const uchar *buffer_start; | |
| 80 | |
| 81 /* The macro, if any, preventing re-inclusion. */ | |
| 82 const cpp_hashnode *cmacro; | |
| 83 | |
| 84 /* The directory in the search path where FILE was found. Used for | |
| 85 #include_next and determining whether a header is a system | |
| 86 header. */ | |
| 87 cpp_dir *dir; | |
| 88 | |
| 89 /* As filled in by stat(2) for the file. */ | |
| 90 struct stat st; | |
| 91 | |
| 92 /* File descriptor. Invalid if -1, otherwise open. */ | |
| 93 int fd; | |
| 94 | |
| 95 /* Zero if this file was successfully opened and stat()-ed, | |
| 96 otherwise errno obtained from failure. */ | |
| 97 int err_no; | |
| 98 | |
| 99 /* Number of times the file has been stacked for preprocessing. */ | |
| 100 unsigned short stack_count; | |
| 101 | |
| 102 /* If opened with #import or contains #pragma once. */ | |
| 103 bool once_only; | |
| 104 | |
| 105 /* If read() failed before. */ | |
| 106 bool dont_read; | |
| 107 | |
| 108 /* If this file is the main file. */ | |
| 109 bool main_file; | |
| 110 | |
| 111 /* If BUFFER above contains the true contents of the file. */ | |
| 112 bool buffer_valid; | |
| 113 }; | |
| 114 | |
| 115 /* A singly-linked list for all searches for a given file name, with | |
| 116 its head pointed to by a slot in FILE_HASH. The file name is what | |
| 117 appeared between the quotes in a #include directive; it can be | |
| 118 determined implicitly from the hash table location or explicitly | |
| 119 from FILE->name. | |
| 120 | |
| 121 FILE is a structure containing details about the file that was | |
| 122 found with that search, or details of how the search failed. | |
| 123 | |
| 124 START_DIR is the starting location of the search in the include | |
| 125 chain. The current directories for "" includes are also hashed in | |
| 126 the hash table and therefore unique. Files that are looked up | |
| 127 without using a search path, such as absolute filenames and file | |
| 128 names from the command line share a special starting directory so | |
| 129 they don't cause cache hits with normal include-chain lookups. | |
| 130 | |
| 131 If START_DIR is NULL then the entry is for a directory, not a file, | |
| 132 and the directory is in DIR. Since the starting point in a file | |
| 133 lookup chain is never NULL, this means that simple pointer | |
| 134 comparisons against START_DIR can be made to determine cache hits | |
| 135 in file lookups. | |
| 136 | |
| 137 If a cache lookup fails because of e.g. an extra "./" in the path, | |
| 138 then nothing will break. It is just less efficient as CPP will | |
| 139 have to do more work re-preprocessing the file, and/or comparing | |
| 140 its contents against earlier once-only files. | |
| 141 */ | |
| 142 struct file_hash_entry | |
| 143 { | |
| 144 struct file_hash_entry *next; | |
| 145 cpp_dir *start_dir; | |
| 146 source_location location; | |
| 147 union | |
| 148 { | |
| 149 _cpp_file *file; | |
| 150 cpp_dir *dir; | |
| 151 } u; | |
| 152 }; | |
| 153 | |
| 154 /* Number of entries to put in a file_hash_entry pool. */ | |
| 155 #define FILE_HASH_POOL_SIZE 127 | |
| 156 | |
| 157 /* A file hash entry pool. We allocate file_hash_entry object from | |
| 158 one of these. */ | |
| 159 struct file_hash_entry_pool | |
| 160 { | |
| 161 /* Number of entries used from this pool. */ | |
| 162 unsigned int file_hash_entries_used; | |
| 163 /* Next pool in the chain; used when freeing. */ | |
| 164 struct file_hash_entry_pool *next; | |
| 165 /* The memory pool. */ | |
| 166 struct file_hash_entry pool[FILE_HASH_POOL_SIZE]; | |
| 167 }; | |
| 168 | |
| 169 static bool open_file (_cpp_file *file); | |
| 170 static bool pch_open_file (cpp_reader *pfile, _cpp_file *file, | |
| 171 bool *invalid_pch); | |
| 172 static bool find_file_in_dir (cpp_reader *pfile, _cpp_file *file, | |
| 173 bool *invalid_pch); | |
| 174 static bool read_file_guts (cpp_reader *pfile, _cpp_file *file); | |
| 175 static bool read_file (cpp_reader *pfile, _cpp_file *file); | |
| 176 static bool should_stack_file (cpp_reader *, _cpp_file *file, bool import); | |
| 177 static struct cpp_dir *search_path_head (cpp_reader *, const char *fname, | |
| 178 int angle_brackets, enum include_type); | |
| 179 static const char *dir_name_of_file (_cpp_file *file); | |
| 180 static void open_file_failed (cpp_reader *pfile, _cpp_file *file, int); | |
| 181 static struct file_hash_entry *search_cache (struct file_hash_entry *head, | |
| 182 const cpp_dir *start_dir); | |
| 183 static _cpp_file *make_cpp_file (cpp_reader *, cpp_dir *, const char *fname); | |
| 184 static void destroy_cpp_file (_cpp_file *); | |
| 185 static cpp_dir *make_cpp_dir (cpp_reader *, const char *dir_name, int sysp); | |
| 186 static void allocate_file_hash_entries (cpp_reader *pfile); | |
| 187 static struct file_hash_entry *new_file_hash_entry (cpp_reader *pfile); | |
| 188 static int report_missing_guard (void **slot, void *b); | |
| 189 static hashval_t file_hash_hash (const void *p); | |
| 190 static int file_hash_eq (const void *p, const void *q); | |
| 191 static char *read_filename_string (int ch, FILE *f); | |
| 192 static void read_name_map (cpp_dir *dir); | |
| 193 static char *remap_filename (cpp_reader *pfile, _cpp_file *file); | |
| 194 static char *append_file_to_dir (const char *fname, cpp_dir *dir); | |
| 195 static bool validate_pch (cpp_reader *, _cpp_file *file, const char *pchname); | |
| 196 static int pchf_save_compare (const void *e1, const void *e2); | |
| 197 static int pchf_compare (const void *d_p, const void *e_p); | |
| 198 static bool check_file_against_entries (cpp_reader *, _cpp_file *, bool); | |
| 199 | |
| 200 /* Given a filename in FILE->PATH, with the empty string interpreted | |
| 201 as <stdin>, open it. | |
| 202 | |
| 203 On success FILE contains an open file descriptor and stat | |
| 204 information for the file. On failure the file descriptor is -1 and | |
| 205 the appropriate errno is also stored in FILE. Returns TRUE iff | |
| 206 successful. | |
| 207 | |
| 208 We used to open files in nonblocking mode, but that caused more | |
| 209 problems than it solved. Do take care not to acquire a controlling | |
| 210 terminal by mistake (this can't happen on sane systems, but | |
| 211 paranoia is a virtue). | |
| 212 | |
| 213 Use the three-argument form of open even though we aren't | |
| 214 specifying O_CREAT, to defend against broken system headers. | |
| 215 | |
| 216 O_BINARY tells some runtime libraries (notably DJGPP) not to do | |
| 217 newline translation; we can handle DOS line breaks just fine | |
| 218 ourselves. */ | |
| 219 static bool | |
| 220 open_file (_cpp_file *file) | |
| 221 { | |
| 222 if (file->path[0] == '\0') | |
| 223 { | |
| 224 file->fd = 0; | |
| 225 set_stdin_to_binary_mode (); | |
| 226 } | |
| 227 else | |
| 228 file->fd = open (file->path, O_RDONLY | O_NOCTTY | O_BINARY, 0666); | |
| 229 | |
| 230 if (file->fd != -1) | |
| 231 { | |
| 232 if (fstat (file->fd, &file->st) == 0) | |
| 233 { | |
| 234 if (!S_ISDIR (file->st.st_mode)) | |
| 235 { | |
| 236 file->err_no = 0; | |
| 237 return true; | |
| 238 } | |
| 239 | |
| 240 /* Ignore a directory and continue the search. The file we're | |
| 241 looking for may be elsewhere in the search path. */ | |
| 242 errno = ENOENT; | |
| 243 } | |
| 244 | |
| 245 close (file->fd); | |
| 246 file->fd = -1; | |
| 247 } | |
| 248 #if defined(_WIN32) && !defined(__CYGWIN__) | |
| 249 else if (errno == EACCES) | |
| 250 { | |
| 251 /* On most UNIX systems, open succeeds on a directory. Above, | |
| 252 we check if we have opened a directory and if so, set errno | |
| 253 to ENOENT. However, on Windows, opening a directory | |
| 254 fails with EACCES. We want to return ENOENT in that | |
| 255 case too. */ | |
| 256 if (stat (file->path, &file->st) == 0 | |
| 257 && S_ISDIR (file->st.st_mode)) | |
| 258 errno = ENOENT; | |
| 259 else | |
| 260 /* The call to stat may have reset errno. */ | |
| 261 errno = EACCES; | |
| 262 } | |
| 263 #endif | |
| 264 else if (errno == ENOTDIR) | |
| 265 errno = ENOENT; | |
| 266 | |
| 267 file->err_no = errno; | |
| 268 | |
| 269 return false; | |
| 270 } | |
| 271 | |
| 272 /* Temporary PCH intercept of opening a file. Try to find a PCH file | |
| 273 based on FILE->name and FILE->dir, and test those found for | |
| 274 validity using PFILE->cb.valid_pch. Return true iff a valid file is | |
| 275 found. Set *INVALID_PCH if a PCH file is found but wasn't valid. */ | |
| 276 | |
| 277 static bool | |
| 278 pch_open_file (cpp_reader *pfile, _cpp_file *file, bool *invalid_pch) | |
| 279 { | |
| 280 static const char extension[] = ".gch"; | |
| 281 const char *path = file->path; | |
| 282 size_t len, flen; | |
| 283 char *pchname; | |
| 284 struct stat st; | |
| 285 bool valid = false; | |
| 286 | |
| 287 /* No PCH on <stdin> or if not requested. */ | |
| 288 if (file->name[0] == '\0' || !pfile->cb.valid_pch) | |
| 289 return false; | |
| 290 | |
|
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291 /* If the file is not included as first include from either the toplevel |
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292 file or the command-line it is not a valid use of PCH. */ |
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293 if (pfile->all_files |
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294 && pfile->all_files->next_file) |
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295 return false; |
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296 |
| 0 | 297 flen = strlen (path); |
| 298 len = flen + sizeof (extension); | |
| 299 pchname = XNEWVEC (char, len); | |
| 300 memcpy (pchname, path, flen); | |
| 301 memcpy (pchname + flen, extension, sizeof (extension)); | |
| 302 | |
| 303 if (stat (pchname, &st) == 0) | |
| 304 { | |
| 305 DIR *pchdir; | |
| 306 struct dirent *d; | |
| 307 size_t dlen, plen = len; | |
| 308 | |
| 309 if (!S_ISDIR (st.st_mode)) | |
| 310 valid = validate_pch (pfile, file, pchname); | |
| 311 else if ((pchdir = opendir (pchname)) != NULL) | |
| 312 { | |
| 313 pchname[plen - 1] = '/'; | |
| 314 while ((d = readdir (pchdir)) != NULL) | |
| 315 { | |
| 316 dlen = strlen (d->d_name) + 1; | |
| 317 if ((strcmp (d->d_name, ".") == 0) | |
| 318 || (strcmp (d->d_name, "..") == 0)) | |
| 319 continue; | |
| 320 if (dlen + plen > len) | |
| 321 { | |
| 322 len += dlen + 64; | |
| 323 pchname = XRESIZEVEC (char, pchname, len); | |
| 324 } | |
| 325 memcpy (pchname + plen, d->d_name, dlen); | |
| 326 valid = validate_pch (pfile, file, pchname); | |
| 327 if (valid) | |
| 328 break; | |
| 329 } | |
| 330 closedir (pchdir); | |
| 331 } | |
| 332 if (!valid) | |
| 333 *invalid_pch = true; | |
| 334 } | |
| 335 | |
| 336 if (valid) | |
| 337 file->pchname = pchname; | |
| 338 else | |
| 339 free (pchname); | |
| 340 | |
| 341 return valid; | |
| 342 } | |
| 343 | |
| 344 /* Try to open the path FILE->name appended to FILE->dir. This is | |
| 345 where remap and PCH intercept the file lookup process. Return true | |
| 346 if the file was found, whether or not the open was successful. | |
| 347 Set *INVALID_PCH to true if a PCH file is found but wasn't valid. */ | |
| 348 | |
| 349 static bool | |
| 350 find_file_in_dir (cpp_reader *pfile, _cpp_file *file, bool *invalid_pch) | |
| 351 { | |
| 352 char *path; | |
| 353 | |
| 354 if (CPP_OPTION (pfile, remap) && (path = remap_filename (pfile, file))) | |
| 355 ; | |
| 356 else | |
| 357 if (file->dir->construct) | |
| 358 path = file->dir->construct (file->name, file->dir); | |
| 359 else | |
| 360 path = append_file_to_dir (file->name, file->dir); | |
| 361 | |
| 362 if (path) | |
| 363 { | |
| 364 hashval_t hv = htab_hash_string (path); | |
| 365 char *copy; | |
| 366 void **pp; | |
| 367 | |
| 368 if (htab_find_with_hash (pfile->nonexistent_file_hash, path, hv) != NULL) | |
| 369 { | |
| 370 file->err_no = ENOENT; | |
| 371 return false; | |
| 372 } | |
| 373 | |
| 374 file->path = path; | |
| 375 if (pch_open_file (pfile, file, invalid_pch)) | |
| 376 return true; | |
| 377 | |
| 378 if (open_file (file)) | |
| 379 return true; | |
| 380 | |
| 381 if (file->err_no != ENOENT) | |
| 382 { | |
| 383 open_file_failed (pfile, file, 0); | |
| 384 return true; | |
| 385 } | |
| 386 | |
| 387 /* We copy the path name onto an obstack partly so that we don't | |
| 388 leak the memory, but mostly so that we don't fragment the | |
| 389 heap. */ | |
|
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390 copy = (char *) obstack_copy0 (&pfile->nonexistent_file_ob, path, |
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391 strlen (path)); |
| 0 | 392 free (path); |
| 393 pp = htab_find_slot_with_hash (pfile->nonexistent_file_hash, | |
| 394 copy, hv, INSERT); | |
| 395 *pp = copy; | |
| 396 | |
| 397 file->path = file->name; | |
| 398 } | |
| 399 else | |
| 400 { | |
| 401 file->err_no = ENOENT; | |
| 402 file->path = NULL; | |
| 403 } | |
| 404 | |
| 405 return false; | |
| 406 } | |
| 407 | |
| 408 /* Return tue iff the missing_header callback found the given HEADER. */ | |
| 409 static bool | |
| 410 search_path_exhausted (cpp_reader *pfile, const char *header, _cpp_file *file) | |
| 411 { | |
| 412 missing_header_cb func = pfile->cb.missing_header; | |
| 413 | |
| 414 /* When the regular search path doesn't work, try context dependent | |
| 415 headers search paths. */ | |
| 416 if (func | |
| 417 && file->dir == NULL) | |
| 418 { | |
| 419 if ((file->path = func (pfile, header, &file->dir)) != NULL) | |
| 420 { | |
| 421 if (open_file (file)) | |
| 422 return true; | |
| 423 free ((void *)file->path); | |
| 424 } | |
| 425 file->path = file->name; | |
| 426 } | |
| 427 | |
| 428 return false; | |
| 429 } | |
| 430 | |
| 431 bool | |
| 432 _cpp_find_failed (_cpp_file *file) | |
| 433 { | |
| 434 return file->err_no != 0; | |
| 435 } | |
| 436 | |
| 437 /* Given a filename FNAME search for such a file in the include path | |
| 438 starting from START_DIR. If FNAME is the empty string it is | |
| 439 interpreted as STDIN if START_DIR is PFILE->no_search_path. | |
| 440 | |
| 441 If the file is not found in the file cache fall back to the O/S and | |
| 442 add the result to our cache. | |
| 443 | |
| 444 If the file was not found in the filesystem, or there was an error | |
| 445 opening it, then ERR_NO is nonzero and FD is -1. If the file was | |
| 446 found, then ERR_NO is zero and FD could be -1 or an open file | |
| 447 descriptor. FD can be -1 if the file was found in the cache and | |
| 448 had previously been closed. To open it again pass the return value | |
| 449 to open_file(). | |
| 450 */ | |
| 451 _cpp_file * | |
| 452 _cpp_find_file (cpp_reader *pfile, const char *fname, cpp_dir *start_dir, bool fake, int angle_brackets) | |
| 453 { | |
| 454 struct file_hash_entry *entry, **hash_slot; | |
| 455 _cpp_file *file; | |
| 456 bool invalid_pch = false; | |
| 457 bool saw_bracket_include = false; | |
| 458 bool saw_quote_include = false; | |
| 459 struct cpp_dir *found_in_cache = NULL; | |
| 460 | |
| 461 /* Ensure we get no confusion between cached files and directories. */ | |
| 462 if (start_dir == NULL) | |
| 463 cpp_error (pfile, CPP_DL_ICE, "NULL directory in find_file"); | |
| 464 | |
| 465 hash_slot = (struct file_hash_entry **) | |
| 466 htab_find_slot_with_hash (pfile->file_hash, fname, | |
| 467 htab_hash_string (fname), | |
| 468 INSERT); | |
| 469 | |
| 470 /* First check the cache before we resort to memory allocation. */ | |
| 471 entry = search_cache (*hash_slot, start_dir); | |
| 472 if (entry) | |
| 473 return entry->u.file; | |
| 474 | |
| 475 file = make_cpp_file (pfile, start_dir, fname); | |
| 476 | |
| 477 /* Try each path in the include chain. */ | |
| 478 for (; !fake ;) | |
| 479 { | |
| 480 if (find_file_in_dir (pfile, file, &invalid_pch)) | |
| 481 break; | |
| 482 | |
| 483 file->dir = file->dir->next; | |
| 484 if (file->dir == NULL) | |
| 485 { | |
| 486 if (search_path_exhausted (pfile, fname, file)) | |
| 487 { | |
| 488 /* Although this file must not go in the cache, because | |
| 489 the file found might depend on things (like the current file) | |
| 490 that aren't represented in the cache, it still has to go in | |
| 491 the list of all files so that #import works. */ | |
| 492 file->next_file = pfile->all_files; | |
| 493 pfile->all_files = file; | |
| 494 return file; | |
| 495 } | |
| 496 | |
| 497 if (invalid_pch) | |
| 498 { | |
| 499 cpp_error (pfile, CPP_DL_ERROR, | |
| 500 "one or more PCH files were found, but they were invalid"); | |
| 501 if (!cpp_get_options (pfile)->warn_invalid_pch) | |
| 502 cpp_error (pfile, CPP_DL_ERROR, | |
| 503 "use -Winvalid-pch for more information"); | |
| 504 } | |
|
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|
505 open_file_failed (pfile, file, angle_brackets); |
| 0 | 506 break; |
| 507 } | |
| 508 | |
| 509 /* Only check the cache for the starting location (done above) | |
| 510 and the quote and bracket chain heads because there are no | |
| 511 other possible starting points for searches. */ | |
| 512 if (file->dir == pfile->bracket_include) | |
| 513 saw_bracket_include = true; | |
| 514 else if (file->dir == pfile->quote_include) | |
| 515 saw_quote_include = true; | |
| 516 else | |
| 517 continue; | |
| 518 | |
| 519 entry = search_cache (*hash_slot, file->dir); | |
| 520 if (entry) | |
| 521 { | |
| 522 found_in_cache = file->dir; | |
| 523 break; | |
| 524 } | |
| 525 } | |
| 526 | |
| 527 if (entry) | |
| 528 { | |
| 529 /* Cache for START_DIR too, sharing the _cpp_file structure. */ | |
| 530 free ((char *) file->name); | |
| 531 free (file); | |
| 532 file = entry->u.file; | |
| 533 } | |
| 534 else | |
| 535 { | |
| 536 /* This is a new file; put it in the list. */ | |
| 537 file->next_file = pfile->all_files; | |
| 538 pfile->all_files = file; | |
| 539 } | |
| 540 | |
| 541 /* Store this new result in the hash table. */ | |
| 542 entry = new_file_hash_entry (pfile); | |
| 543 entry->next = *hash_slot; | |
| 544 entry->start_dir = start_dir; | |
| 545 entry->location = pfile->line_table->highest_location; | |
| 546 entry->u.file = file; | |
| 547 *hash_slot = entry; | |
| 548 | |
| 549 /* If we passed the quote or bracket chain heads, cache them also. | |
| 550 This speeds up processing if there are lots of -I options. */ | |
| 551 if (saw_bracket_include | |
| 552 && pfile->bracket_include != start_dir | |
| 553 && found_in_cache != pfile->bracket_include) | |
| 554 { | |
| 555 entry = new_file_hash_entry (pfile); | |
| 556 entry->next = *hash_slot; | |
| 557 entry->start_dir = pfile->bracket_include; | |
| 558 entry->location = pfile->line_table->highest_location; | |
| 559 entry->u.file = file; | |
| 560 *hash_slot = entry; | |
| 561 } | |
| 562 if (saw_quote_include | |
| 563 && pfile->quote_include != start_dir | |
| 564 && found_in_cache != pfile->quote_include) | |
| 565 { | |
| 566 entry = new_file_hash_entry (pfile); | |
| 567 entry->next = *hash_slot; | |
| 568 entry->start_dir = pfile->quote_include; | |
| 569 entry->location = pfile->line_table->highest_location; | |
| 570 entry->u.file = file; | |
| 571 *hash_slot = entry; | |
| 572 } | |
| 573 | |
| 574 return file; | |
| 575 } | |
| 576 | |
| 577 /* Read a file into FILE->buffer, returning true on success. | |
| 578 | |
| 579 If FILE->fd is something weird, like a block device, we don't want | |
| 580 to read it at all. Don't even try to figure out what something is, | |
| 581 except for plain files and block devices, since there is no | |
| 582 reliable portable way of doing this. | |
| 583 | |
| 584 FIXME: Flush file cache and try again if we run out of memory. */ | |
| 585 static bool | |
| 586 read_file_guts (cpp_reader *pfile, _cpp_file *file) | |
| 587 { | |
| 588 ssize_t size, total, count; | |
| 589 uchar *buf; | |
| 590 bool regular; | |
| 591 | |
| 592 if (S_ISBLK (file->st.st_mode)) | |
| 593 { | |
| 594 cpp_error (pfile, CPP_DL_ERROR, "%s is a block device", file->path); | |
| 595 return false; | |
| 596 } | |
| 597 | |
| 598 regular = S_ISREG (file->st.st_mode); | |
| 599 if (regular) | |
| 600 { | |
| 601 /* off_t might have a wider range than ssize_t - in other words, | |
| 602 the max size of a file might be bigger than the address | |
| 603 space. We can't handle a file that large. (Anyone with | |
| 604 a single source file bigger than 2GB needs to rethink | |
| 605 their coding style.) Some systems (e.g. AIX 4.1) define | |
| 606 SSIZE_MAX to be much smaller than the actual range of the | |
| 607 type. Use INTTYPE_MAXIMUM unconditionally to ensure this | |
| 608 does not bite us. */ | |
| 609 if (file->st.st_size > INTTYPE_MAXIMUM (ssize_t)) | |
| 610 { | |
| 611 cpp_error (pfile, CPP_DL_ERROR, "%s is too large", file->path); | |
| 612 return false; | |
| 613 } | |
| 614 | |
| 615 size = file->st.st_size; | |
| 616 } | |
| 617 else | |
| 618 /* 8 kilobytes is a sensible starting size. It ought to be bigger | |
| 619 than the kernel pipe buffer, and it's definitely bigger than | |
| 620 the majority of C source files. */ | |
| 621 size = 8 * 1024; | |
| 622 | |
| 623 buf = XNEWVEC (uchar, size + 1); | |
| 624 total = 0; | |
| 625 while ((count = read (file->fd, buf + total, size - total)) > 0) | |
| 626 { | |
| 627 total += count; | |
| 628 | |
| 629 if (total == size) | |
| 630 { | |
| 631 if (regular) | |
| 632 break; | |
| 633 size *= 2; | |
| 634 buf = XRESIZEVEC (uchar, buf, size + 1); | |
| 635 } | |
| 636 } | |
| 637 | |
| 638 if (count < 0) | |
| 639 { | |
| 640 cpp_errno (pfile, CPP_DL_ERROR, file->path); | |
| 641 return false; | |
| 642 } | |
| 643 | |
| 644 if (regular && total != size && STAT_SIZE_RELIABLE (file->st)) | |
| 645 cpp_error (pfile, CPP_DL_WARNING, | |
| 646 "%s is shorter than expected", file->path); | |
| 647 | |
| 648 file->buffer = _cpp_convert_input (pfile, | |
| 649 CPP_OPTION (pfile, input_charset), | |
| 650 buf, size, total, | |
| 651 &file->buffer_start, | |
| 652 &file->st.st_size); | |
| 653 file->buffer_valid = true; | |
| 654 | |
| 655 return true; | |
| 656 } | |
| 657 | |
| 658 /* Convenience wrapper around read_file_guts that opens the file if | |
| 659 necessary and closes the file descriptor after reading. FILE must | |
| 660 have been passed through find_file() at some stage. */ | |
| 661 static bool | |
| 662 read_file (cpp_reader *pfile, _cpp_file *file) | |
| 663 { | |
| 664 /* If we already have its contents in memory, succeed immediately. */ | |
| 665 if (file->buffer_valid) | |
| 666 return true; | |
| 667 | |
| 668 /* If an earlier read failed for some reason don't try again. */ | |
| 669 if (file->dont_read || file->err_no) | |
| 670 return false; | |
| 671 | |
| 672 if (file->fd == -1 && !open_file (file)) | |
| 673 { | |
| 674 open_file_failed (pfile, file, 0); | |
| 675 return false; | |
| 676 } | |
| 677 | |
| 678 file->dont_read = !read_file_guts (pfile, file); | |
| 679 close (file->fd); | |
| 680 file->fd = -1; | |
| 681 | |
| 682 return !file->dont_read; | |
| 683 } | |
| 684 | |
| 685 /* Returns TRUE if FILE's contents have been successfully placed in | |
| 686 FILE->buffer and the file should be stacked, otherwise false. */ | |
| 687 static bool | |
| 688 should_stack_file (cpp_reader *pfile, _cpp_file *file, bool import) | |
| 689 { | |
| 690 _cpp_file *f; | |
| 691 | |
| 692 /* Skip once-only files. */ | |
| 693 if (file->once_only) | |
| 694 return false; | |
| 695 | |
| 696 /* We must mark the file once-only if #import now, before header | |
| 697 guard checks. Otherwise, undefining the header guard might | |
| 698 cause the file to be re-stacked. */ | |
| 699 if (import) | |
| 700 { | |
| 701 _cpp_mark_file_once_only (pfile, file); | |
| 702 | |
| 703 /* Don't stack files that have been stacked before. */ | |
| 704 if (file->stack_count) | |
| 705 return false; | |
| 706 } | |
| 707 | |
| 708 /* Skip if the file had a header guard and the macro is defined. | |
| 709 PCH relies on this appearing before the PCH handler below. */ | |
| 710 if (file->cmacro && file->cmacro->type == NT_MACRO) | |
| 711 return false; | |
| 712 | |
| 713 /* Handle PCH files immediately; don't stack them. */ | |
| 714 if (file->pchname) | |
| 715 { | |
| 716 pfile->cb.read_pch (pfile, file->pchname, file->fd, file->path); | |
| 717 file->fd = -1; | |
| 718 free ((void *) file->pchname); | |
| 719 file->pchname = NULL; | |
| 720 return false; | |
| 721 } | |
| 722 | |
| 723 if (!read_file (pfile, file)) | |
| 724 return false; | |
| 725 | |
| 726 /* Check the file against the PCH file. This is done before | |
| 727 checking against files we've already seen, since it may save on | |
| 728 I/O. */ | |
| 729 if (check_file_against_entries (pfile, file, import)) | |
| 730 { | |
| 731 /* If this isn't a #import, but yet we can't include the file, | |
| 732 that means that it was #import-ed in the PCH file, | |
| 733 so we can never include it again. */ | |
| 734 if (! import) | |
| 735 _cpp_mark_file_once_only (pfile, file); | |
| 736 return false; | |
| 737 } | |
| 738 | |
| 739 /* Now we've read the file's contents, we can stack it if there | |
| 740 are no once-only files. */ | |
| 741 if (!pfile->seen_once_only) | |
| 742 return true; | |
| 743 | |
| 744 /* We may have read the file under a different name. Look | |
| 745 for likely candidates and compare file contents to be sure. */ | |
| 746 for (f = pfile->all_files; f; f = f->next_file) | |
| 747 { | |
| 748 if (f == file) | |
| 749 continue; | |
| 750 | |
| 751 if ((import || f->once_only) | |
| 752 && f->err_no == 0 | |
| 753 && f->st.st_mtime == file->st.st_mtime | |
| 754 && f->st.st_size == file->st.st_size) | |
| 755 { | |
| 756 _cpp_file *ref_file; | |
| 757 bool same_file_p = false; | |
| 758 | |
| 759 if (f->buffer && !f->buffer_valid) | |
| 760 { | |
| 761 /* We already have a buffer but it is not valid, because | |
| 762 the file is still stacked. Make a new one. */ | |
| 763 ref_file = make_cpp_file (pfile, f->dir, f->name); | |
| 764 ref_file->path = f->path; | |
| 765 } | |
| 766 else | |
| 767 /* The file is not stacked anymore. We can reuse it. */ | |
| 768 ref_file = f; | |
| 769 | |
| 770 same_file_p = read_file (pfile, ref_file) | |
| 771 /* Size might have changed in read_file(). */ | |
| 772 && ref_file->st.st_size == file->st.st_size | |
| 773 && !memcmp (ref_file->buffer, | |
| 774 file->buffer, | |
| 775 file->st.st_size); | |
| 776 | |
| 777 if (f->buffer && !f->buffer_valid) | |
| 778 { | |
| 779 ref_file->path = 0; | |
| 780 destroy_cpp_file (ref_file); | |
| 781 } | |
| 782 | |
| 783 if (same_file_p) | |
| 784 break; | |
| 785 } | |
| 786 } | |
| 787 | |
| 788 return f == NULL; | |
| 789 } | |
| 790 | |
| 791 /* Place the file referenced by FILE into a new buffer on the buffer | |
| 792 stack if possible. IMPORT is true if this stacking attempt is | |
| 793 because of a #import directive. Returns true if a buffer is | |
| 794 stacked. */ | |
| 795 bool | |
| 796 _cpp_stack_file (cpp_reader *pfile, _cpp_file *file, bool import) | |
| 797 { | |
| 798 cpp_buffer *buffer; | |
| 799 int sysp; | |
| 800 | |
| 801 if (!should_stack_file (pfile, file, import)) | |
| 802 return false; | |
| 803 | |
| 804 if (pfile->buffer == NULL || file->dir == NULL) | |
| 805 sysp = 0; | |
| 806 else | |
| 807 sysp = MAX (pfile->buffer->sysp, file->dir->sysp); | |
| 808 | |
| 809 /* Add the file to the dependencies on its first inclusion. */ | |
| 810 if (CPP_OPTION (pfile, deps.style) > !!sysp && !file->stack_count) | |
| 811 { | |
| 812 if (!file->main_file || !CPP_OPTION (pfile, deps.ignore_main_file)) | |
| 813 deps_add_dep (pfile->deps, file->path); | |
| 814 } | |
| 815 | |
| 816 /* Clear buffer_valid since _cpp_clean_line messes it up. */ | |
| 817 file->buffer_valid = false; | |
| 818 file->stack_count++; | |
| 819 | |
| 820 /* Stack the buffer. */ | |
| 821 buffer = cpp_push_buffer (pfile, file->buffer, file->st.st_size, | |
| 822 CPP_OPTION (pfile, preprocessed) | |
| 823 && !CPP_OPTION (pfile, directives_only)); | |
| 824 buffer->file = file; | |
| 825 buffer->sysp = sysp; | |
| 826 | |
| 827 /* Initialize controlling macro state. */ | |
| 828 pfile->mi_valid = true; | |
| 829 pfile->mi_cmacro = 0; | |
| 830 | |
| 831 /* Generate the call back. */ | |
| 832 _cpp_do_file_change (pfile, LC_ENTER, file->path, 1, sysp); | |
| 833 | |
| 834 return true; | |
| 835 } | |
| 836 | |
| 837 /* Mark FILE to be included once only. */ | |
| 838 void | |
| 839 _cpp_mark_file_once_only (cpp_reader *pfile, _cpp_file *file) | |
| 840 { | |
| 841 pfile->seen_once_only = true; | |
| 842 file->once_only = true; | |
| 843 } | |
| 844 | |
| 845 /* Return the directory from which searching for FNAME should start, | |
| 846 considering the directive TYPE and ANGLE_BRACKETS. If there is | |
| 847 nothing left in the path, returns NULL. */ | |
| 848 static struct cpp_dir * | |
| 849 search_path_head (cpp_reader *pfile, const char *fname, int angle_brackets, | |
| 850 enum include_type type) | |
| 851 { | |
| 852 cpp_dir *dir; | |
| 853 _cpp_file *file; | |
| 854 | |
| 855 if (IS_ABSOLUTE_PATH (fname)) | |
| 856 return &pfile->no_search_path; | |
| 857 | |
| 858 /* pfile->buffer is NULL when processing an -include command-line flag. */ | |
| 859 file = pfile->buffer == NULL ? pfile->main_file : pfile->buffer->file; | |
| 860 | |
| 861 /* For #include_next, skip in the search path past the dir in which | |
| 862 the current file was found, but if it was found via an absolute | |
| 863 path use the normal search logic. */ | |
| 864 if (type == IT_INCLUDE_NEXT && file->dir | |
| 865 && file->dir != &pfile->no_search_path) | |
| 866 dir = file->dir->next; | |
| 867 else if (angle_brackets) | |
| 868 dir = pfile->bracket_include; | |
| 869 else if (type == IT_CMDLINE) | |
| 870 /* -include and -imacros use the #include "" chain with the | |
| 871 preprocessor's cwd prepended. */ | |
| 872 return make_cpp_dir (pfile, "./", false); | |
| 873 else if (pfile->quote_ignores_source_dir) | |
| 874 dir = pfile->quote_include; | |
| 875 else | |
| 876 return make_cpp_dir (pfile, dir_name_of_file (file), | |
| 877 pfile->buffer ? pfile->buffer->sysp : 0); | |
| 878 | |
| 879 if (dir == NULL) | |
| 880 cpp_error (pfile, CPP_DL_ERROR, | |
| 881 "no include path in which to search for %s", fname); | |
| 882 | |
| 883 return dir; | |
| 884 } | |
| 885 | |
| 886 /* Strip the basename from the file's path. It ends with a slash if | |
| 887 of nonzero length. Note that this procedure also works for | |
| 888 <stdin>, which is represented by the empty string. */ | |
| 889 static const char * | |
| 890 dir_name_of_file (_cpp_file *file) | |
| 891 { | |
| 892 if (!file->dir_name) | |
| 893 { | |
| 894 size_t len = lbasename (file->path) - file->path; | |
| 895 char *dir_name = XNEWVEC (char, len + 1); | |
| 896 | |
| 897 memcpy (dir_name, file->path, len); | |
| 898 dir_name[len] = '\0'; | |
| 899 file->dir_name = dir_name; | |
| 900 } | |
| 901 | |
| 902 return file->dir_name; | |
| 903 } | |
| 904 | |
| 905 /* Handles #include-family directives (distinguished by TYPE), | |
| 906 including HEADER, and the command line -imacros and -include. | |
| 907 Returns true if a buffer was stacked. */ | |
| 908 bool | |
| 909 _cpp_stack_include (cpp_reader *pfile, const char *fname, int angle_brackets, | |
| 910 enum include_type type) | |
| 911 { | |
| 912 struct cpp_dir *dir; | |
| 913 _cpp_file *file; | |
| 914 | |
| 915 dir = search_path_head (pfile, fname, angle_brackets, type); | |
| 916 if (!dir) | |
| 917 return false; | |
| 918 | |
| 919 file = _cpp_find_file (pfile, fname, dir, false, angle_brackets); | |
| 920 | |
|
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921 /* Compensate for the increment in linemap_add that occurs in |
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922 _cpp_stack_file. In the case of a normal #include, we're |
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923 currently at the start of the line *following* the #include. A |
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924 separate source_location for this location makes no sense (until |
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925 we do the LC_LEAVE), and complicates LAST_SOURCE_LINE_LOCATION. |
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926 This does not apply if we found a PCH file (in which case |
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927 linemap_add is not called) or we were included from the |
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928 command-line. */ |
| 0 | 929 if (file->pchname == NULL && file->err_no == 0 && type != IT_CMDLINE) |
| 930 pfile->line_table->highest_location--; | |
| 931 | |
| 932 return _cpp_stack_file (pfile, file, type == IT_IMPORT); | |
| 933 } | |
| 934 | |
| 935 /* Could not open FILE. The complication is dependency output. */ | |
| 936 static void | |
| 937 open_file_failed (cpp_reader *pfile, _cpp_file *file, int angle_brackets) | |
| 938 { | |
| 939 int sysp = pfile->line_table->highest_line > 1 && pfile->buffer ? pfile->buffer->sysp : 0; | |
| 940 bool print_dep = CPP_OPTION (pfile, deps.style) > (angle_brackets || !!sysp); | |
| 941 | |
| 942 errno = file->err_no; | |
| 943 if (print_dep && CPP_OPTION (pfile, deps.missing_files) && errno == ENOENT) | |
|
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944 { |
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945 deps_add_dep (pfile->deps, file->name); |
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946 /* If the preprocessor output (other than dependency information) is |
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947 being used, we must also flag an error. */ |
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948 if (CPP_OPTION (pfile, deps.need_preprocessor_output)) |
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949 cpp_errno (pfile, CPP_DL_FATAL, file->path); |
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950 } |
| 0 | 951 else |
| 952 { | |
|
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953 /* If we are not outputting dependencies, or if we are and dependencies |
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954 were requested for this file, or if preprocessor output is needed |
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955 in addition to dependency information, this is an error. |
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956 |
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957 Otherwise (outputting dependencies but not for this file, and not |
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958 using the preprocessor output), we can still produce correct output |
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959 so it's only a warning. */ |
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960 if (CPP_OPTION (pfile, deps.style) == DEPS_NONE |
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961 || print_dep |
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962 || CPP_OPTION (pfile, deps.need_preprocessor_output)) |
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963 cpp_errno (pfile, CPP_DL_FATAL, file->path); |
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964 else |
| 0 | 965 cpp_errno (pfile, CPP_DL_WARNING, file->path); |
| 966 } | |
| 967 } | |
| 968 | |
| 969 /* Search in the chain beginning at HEAD for a file whose search path | |
| 970 started at START_DIR != NULL. */ | |
| 971 static struct file_hash_entry * | |
| 972 search_cache (struct file_hash_entry *head, const cpp_dir *start_dir) | |
| 973 { | |
| 974 while (head && head->start_dir != start_dir) | |
| 975 head = head->next; | |
| 976 | |
| 977 return head; | |
| 978 } | |
| 979 | |
| 980 /* Allocate a new _cpp_file structure. */ | |
| 981 static _cpp_file * | |
| 982 make_cpp_file (cpp_reader *pfile, cpp_dir *dir, const char *fname) | |
| 983 { | |
| 984 _cpp_file *file; | |
| 985 | |
| 986 file = XCNEW (_cpp_file); | |
| 987 file->main_file = !pfile->buffer; | |
| 988 file->fd = -1; | |
| 989 file->dir = dir; | |
| 990 file->name = xstrdup (fname); | |
| 991 | |
| 992 return file; | |
| 993 } | |
| 994 | |
| 995 /* Release a _cpp_file structure. */ | |
| 996 static void | |
| 997 destroy_cpp_file (_cpp_file *file) | |
| 998 { | |
| 999 if (file->buffer_start) | |
| 1000 free ((void *) file->buffer_start); | |
| 1001 free ((void *) file->name); | |
| 1002 free (file); | |
| 1003 } | |
| 1004 | |
| 1005 /* Release all the files allocated by this reader. */ | |
| 1006 static void | |
| 1007 destroy_all_cpp_files (cpp_reader *pfile) | |
| 1008 { | |
| 1009 _cpp_file *iter = pfile->all_files; | |
| 1010 while (iter) | |
| 1011 { | |
| 1012 _cpp_file *next = iter->next_file; | |
| 1013 destroy_cpp_file (iter); | |
| 1014 iter = next; | |
| 1015 } | |
| 1016 } | |
| 1017 | |
| 1018 /* A hash of directory names. The directory names are the path names | |
| 1019 of files which contain a #include "", the included file name is | |
| 1020 appended to this directories. | |
| 1021 | |
| 1022 To avoid duplicate entries we follow the convention that all | |
| 1023 non-empty directory names should end in a '/'. DIR_NAME must be | |
| 1024 stored in permanently allocated memory. */ | |
| 1025 static cpp_dir * | |
| 1026 make_cpp_dir (cpp_reader *pfile, const char *dir_name, int sysp) | |
| 1027 { | |
| 1028 struct file_hash_entry *entry, **hash_slot; | |
| 1029 cpp_dir *dir; | |
| 1030 | |
| 1031 hash_slot = (struct file_hash_entry **) | |
| 1032 htab_find_slot_with_hash (pfile->dir_hash, dir_name, | |
| 1033 htab_hash_string (dir_name), | |
| 1034 INSERT); | |
| 1035 | |
| 1036 /* Have we already hashed this directory? */ | |
| 1037 for (entry = *hash_slot; entry; entry = entry->next) | |
| 1038 if (entry->start_dir == NULL) | |
| 1039 return entry->u.dir; | |
| 1040 | |
| 1041 dir = XCNEW (cpp_dir); | |
| 1042 dir->next = pfile->quote_include; | |
| 1043 dir->name = (char *) dir_name; | |
| 1044 dir->len = strlen (dir_name); | |
| 1045 dir->sysp = sysp; | |
| 1046 dir->construct = 0; | |
| 1047 | |
| 1048 /* Store this new result in the hash table. */ | |
| 1049 entry = new_file_hash_entry (pfile); | |
| 1050 entry->next = *hash_slot; | |
| 1051 entry->start_dir = NULL; | |
| 1052 entry->location = pfile->line_table->highest_location; | |
| 1053 entry->u.dir = dir; | |
| 1054 *hash_slot = entry; | |
| 1055 | |
| 1056 return dir; | |
| 1057 } | |
| 1058 | |
| 1059 /* Create a new block of memory for file hash entries. */ | |
| 1060 static void | |
| 1061 allocate_file_hash_entries (cpp_reader *pfile) | |
| 1062 { | |
| 1063 struct file_hash_entry_pool *pool = XNEW (struct file_hash_entry_pool); | |
| 1064 pool->file_hash_entries_used = 0; | |
| 1065 pool->next = pfile->file_hash_entries; | |
| 1066 pfile->file_hash_entries = pool; | |
| 1067 } | |
| 1068 | |
| 1069 /* Return a new file hash entry. */ | |
| 1070 static struct file_hash_entry * | |
| 1071 new_file_hash_entry (cpp_reader *pfile) | |
| 1072 { | |
| 1073 unsigned int idx; | |
| 1074 if (pfile->file_hash_entries->file_hash_entries_used == FILE_HASH_POOL_SIZE) | |
| 1075 allocate_file_hash_entries (pfile); | |
| 1076 | |
| 1077 idx = pfile->file_hash_entries->file_hash_entries_used++; | |
| 1078 return &pfile->file_hash_entries->pool[idx]; | |
| 1079 } | |
| 1080 | |
| 1081 /* Free the file hash entry pools. */ | |
| 1082 static void | |
| 1083 free_file_hash_entries (cpp_reader *pfile) | |
| 1084 { | |
| 1085 struct file_hash_entry_pool *iter = pfile->file_hash_entries; | |
| 1086 while (iter) | |
| 1087 { | |
| 1088 struct file_hash_entry_pool *next = iter->next; | |
| 1089 free (iter); | |
| 1090 iter = next; | |
| 1091 } | |
| 1092 } | |
| 1093 | |
| 1094 /* Returns TRUE if a file FNAME has ever been successfully opened. | |
| 1095 This routine is not intended to correctly handle filenames aliased | |
| 1096 by links or redundant . or .. traversals etc. */ | |
| 1097 bool | |
| 1098 cpp_included (cpp_reader *pfile, const char *fname) | |
| 1099 { | |
| 1100 struct file_hash_entry *entry; | |
| 1101 | |
| 1102 entry = (struct file_hash_entry *) | |
| 1103 htab_find_with_hash (pfile->file_hash, fname, htab_hash_string (fname)); | |
| 1104 | |
| 1105 while (entry && (entry->start_dir == NULL || entry->u.file->err_no)) | |
| 1106 entry = entry->next; | |
| 1107 | |
| 1108 return entry != NULL; | |
| 1109 } | |
| 1110 | |
| 1111 /* Returns TRUE if a file FNAME has ever been successfully opened | |
| 1112 before LOCATION. This routine is not intended to correctly handle | |
| 1113 filenames aliased by links or redundant . or .. traversals etc. */ | |
| 1114 bool | |
| 1115 cpp_included_before (cpp_reader *pfile, const char *fname, | |
| 1116 source_location location) | |
| 1117 { | |
| 1118 struct file_hash_entry *entry; | |
| 1119 | |
| 1120 entry = (struct file_hash_entry *) | |
| 1121 htab_find_with_hash (pfile->file_hash, fname, htab_hash_string (fname)); | |
| 1122 | |
| 1123 while (entry && (entry->start_dir == NULL || entry->u.file->err_no | |
| 1124 || entry->location > location)) | |
| 1125 entry = entry->next; | |
| 1126 | |
| 1127 return entry != NULL; | |
| 1128 } | |
| 1129 | |
| 1130 /* Calculate the hash value of a file hash entry P. */ | |
| 1131 | |
| 1132 static hashval_t | |
| 1133 file_hash_hash (const void *p) | |
| 1134 { | |
| 1135 struct file_hash_entry *entry = (struct file_hash_entry *) p; | |
| 1136 const char *hname; | |
| 1137 if (entry->start_dir) | |
| 1138 hname = entry->u.file->name; | |
| 1139 else | |
| 1140 hname = entry->u.dir->name; | |
| 1141 | |
| 1142 return htab_hash_string (hname); | |
| 1143 } | |
| 1144 | |
| 1145 /* Compare a string Q against a file hash entry P. */ | |
| 1146 static int | |
| 1147 file_hash_eq (const void *p, const void *q) | |
| 1148 { | |
| 1149 struct file_hash_entry *entry = (struct file_hash_entry *) p; | |
| 1150 const char *fname = (const char *) q; | |
| 1151 const char *hname; | |
| 1152 | |
| 1153 if (entry->start_dir) | |
| 1154 hname = entry->u.file->name; | |
| 1155 else | |
| 1156 hname = entry->u.dir->name; | |
| 1157 | |
| 1158 return strcmp (hname, fname) == 0; | |
| 1159 } | |
| 1160 | |
| 1161 /* Compare entries in the nonexistent file hash table. These are just | |
| 1162 strings. */ | |
| 1163 static int | |
| 1164 nonexistent_file_hash_eq (const void *p, const void *q) | |
| 1165 { | |
|
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1166 return strcmp ((const char *) p, (const char *) q) == 0; |
| 0 | 1167 } |
| 1168 | |
| 1169 /* Initialize everything in this source file. */ | |
| 1170 void | |
| 1171 _cpp_init_files (cpp_reader *pfile) | |
| 1172 { | |
| 1173 pfile->file_hash = htab_create_alloc (127, file_hash_hash, file_hash_eq, | |
| 1174 NULL, xcalloc, free); | |
| 1175 pfile->dir_hash = htab_create_alloc (127, file_hash_hash, file_hash_eq, | |
| 1176 NULL, xcalloc, free); | |
| 1177 allocate_file_hash_entries (pfile); | |
| 1178 pfile->nonexistent_file_hash = htab_create_alloc (127, htab_hash_string, | |
| 1179 nonexistent_file_hash_eq, | |
| 1180 NULL, xcalloc, free); | |
| 1181 _obstack_begin (&pfile->nonexistent_file_ob, 0, 0, | |
| 1182 (void *(*) (long)) xmalloc, | |
| 1183 (void (*) (void *)) free); | |
| 1184 } | |
| 1185 | |
| 1186 /* Finalize everything in this source file. */ | |
| 1187 void | |
| 1188 _cpp_cleanup_files (cpp_reader *pfile) | |
| 1189 { | |
| 1190 htab_delete (pfile->file_hash); | |
| 1191 htab_delete (pfile->dir_hash); | |
| 1192 htab_delete (pfile->nonexistent_file_hash); | |
| 1193 obstack_free (&pfile->nonexistent_file_ob, 0); | |
| 1194 free_file_hash_entries (pfile); | |
| 1195 destroy_all_cpp_files (pfile); | |
| 1196 } | |
| 1197 | |
| 1198 /* Make the parser forget about files it has seen. This can be useful | |
| 1199 for resetting the parser to start another run. */ | |
| 1200 void | |
| 1201 cpp_clear_file_cache (cpp_reader *pfile) | |
| 1202 { | |
| 1203 _cpp_cleanup_files (pfile); | |
| 1204 pfile->file_hash_entries = NULL; | |
| 1205 pfile->all_files = NULL; | |
| 1206 _cpp_init_files (pfile); | |
| 1207 } | |
| 1208 | |
| 1209 /* Enter a file name in the hash for the sake of cpp_included. */ | |
| 1210 void | |
| 1211 _cpp_fake_include (cpp_reader *pfile, const char *fname) | |
| 1212 { | |
| 1213 _cpp_find_file (pfile, fname, pfile->buffer->file->dir, true, 0); | |
| 1214 } | |
| 1215 | |
| 1216 /* Not everyone who wants to set system-header-ness on a buffer can | |
| 1217 see the details of a buffer. This is an exported interface because | |
| 1218 fix-header needs it. */ | |
| 1219 void | |
| 1220 cpp_make_system_header (cpp_reader *pfile, int syshdr, int externc) | |
| 1221 { | |
| 1222 int flags = 0; | |
| 1223 const struct line_maps *line_table = pfile->line_table; | |
| 1224 const struct line_map *map = &line_table->maps[line_table->used-1]; | |
| 1225 | |
| 1226 /* 1 = system header, 2 = system header to be treated as C. */ | |
| 1227 if (syshdr) | |
| 1228 flags = 1 + (externc != 0); | |
| 1229 pfile->buffer->sysp = flags; | |
| 1230 _cpp_do_file_change (pfile, LC_RENAME, map->to_file, | |
| 1231 SOURCE_LINE (map, pfile->line_table->highest_line), flags); | |
| 1232 } | |
| 1233 | |
| 1234 /* Allow the client to change the current file. Used by the front end | |
| 1235 to achieve pseudo-file names like <built-in>. | |
| 1236 If REASON is LC_LEAVE, then NEW_NAME must be NULL. */ | |
| 1237 void | |
| 1238 cpp_change_file (cpp_reader *pfile, enum lc_reason reason, | |
| 1239 const char *new_name) | |
| 1240 { | |
| 1241 _cpp_do_file_change (pfile, reason, new_name, 1, 0); | |
| 1242 } | |
| 1243 | |
| 1244 struct report_missing_guard_data | |
| 1245 { | |
| 1246 const char **paths; | |
| 1247 size_t count; | |
| 1248 }; | |
| 1249 | |
| 1250 /* Callback function for htab_traverse. */ | |
| 1251 static int | |
| 1252 report_missing_guard (void **slot, void *d) | |
| 1253 { | |
| 1254 struct file_hash_entry *entry = (struct file_hash_entry *) *slot; | |
| 1255 struct report_missing_guard_data *data | |
| 1256 = (struct report_missing_guard_data *) d; | |
| 1257 | |
| 1258 /* Skip directories. */ | |
| 1259 if (entry->start_dir != NULL) | |
| 1260 { | |
| 1261 _cpp_file *file = entry->u.file; | |
| 1262 | |
| 1263 /* We don't want MI guard advice for the main file. */ | |
|
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1264 if (!file->once_only && file->cmacro == NULL |
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1265 && file->stack_count == 1 && !file->main_file) |
| 0 | 1266 { |
| 1267 if (data->paths == NULL) | |
| 1268 { | |
| 1269 data->paths = XCNEWVEC (const char *, data->count); | |
| 1270 data->count = 0; | |
| 1271 } | |
| 1272 | |
| 1273 data->paths[data->count++] = file->path; | |
| 1274 } | |
| 1275 } | |
| 1276 | |
| 1277 /* Keep traversing the hash table. */ | |
| 1278 return 1; | |
| 1279 } | |
| 1280 | |
| 1281 /* Comparison function for qsort. */ | |
| 1282 static int | |
| 1283 report_missing_guard_cmp (const void *p1, const void *p2) | |
| 1284 { | |
| 1285 return strcmp (*(const char *const *) p1, *(const char *const *) p2); | |
| 1286 } | |
| 1287 | |
| 1288 /* Report on all files that might benefit from a multiple include guard. | |
| 1289 Triggered by -H. */ | |
| 1290 void | |
| 1291 _cpp_report_missing_guards (cpp_reader *pfile) | |
| 1292 { | |
| 1293 struct report_missing_guard_data data; | |
| 1294 | |
| 1295 data.paths = NULL; | |
| 1296 data.count = htab_elements (pfile->file_hash); | |
| 1297 htab_traverse (pfile->file_hash, report_missing_guard, &data); | |
| 1298 | |
| 1299 if (data.paths != NULL) | |
| 1300 { | |
| 1301 size_t i; | |
| 1302 | |
| 1303 /* Sort the paths to avoid outputting them in hash table | |
| 1304 order. */ | |
| 1305 qsort (data.paths, data.count, sizeof (const char *), | |
| 1306 report_missing_guard_cmp); | |
| 1307 fputs (_("Multiple include guards may be useful for:\n"), | |
| 1308 stderr); | |
| 1309 for (i = 0; i < data.count; i++) | |
| 1310 { | |
| 1311 fputs (data.paths[i], stderr); | |
| 1312 putc ('\n', stderr); | |
| 1313 } | |
| 1314 free (data.paths); | |
| 1315 } | |
| 1316 } | |
| 1317 | |
| 1318 /* Locate HEADER, and determine whether it is newer than the current | |
| 1319 file. If it cannot be located or dated, return -1, if it is | |
| 1320 newer, return 1, otherwise 0. */ | |
| 1321 int | |
| 1322 _cpp_compare_file_date (cpp_reader *pfile, const char *fname, | |
| 1323 int angle_brackets) | |
| 1324 { | |
| 1325 _cpp_file *file; | |
| 1326 struct cpp_dir *dir; | |
| 1327 | |
| 1328 dir = search_path_head (pfile, fname, angle_brackets, IT_INCLUDE); | |
| 1329 if (!dir) | |
| 1330 return -1; | |
| 1331 | |
| 1332 file = _cpp_find_file (pfile, fname, dir, false, angle_brackets); | |
| 1333 if (file->err_no) | |
| 1334 return -1; | |
| 1335 | |
| 1336 if (file->fd != -1) | |
| 1337 { | |
| 1338 close (file->fd); | |
| 1339 file->fd = -1; | |
| 1340 } | |
| 1341 | |
| 1342 return file->st.st_mtime > pfile->buffer->file->st.st_mtime; | |
| 1343 } | |
| 1344 | |
| 1345 /* Pushes the given file onto the buffer stack. Returns nonzero if | |
| 1346 successful. */ | |
| 1347 bool | |
| 1348 cpp_push_include (cpp_reader *pfile, const char *fname) | |
| 1349 { | |
| 1350 return _cpp_stack_include (pfile, fname, false, IT_CMDLINE); | |
| 1351 } | |
| 1352 | |
| 1353 /* Do appropriate cleanup when a file INC's buffer is popped off the | |
| 1354 input stack. */ | |
| 1355 void | |
| 1356 _cpp_pop_file_buffer (cpp_reader *pfile, _cpp_file *file) | |
| 1357 { | |
| 1358 /* Record the inclusion-preventing macro, which could be NULL | |
| 1359 meaning no controlling macro. */ | |
| 1360 if (pfile->mi_valid && file->cmacro == NULL) | |
| 1361 file->cmacro = pfile->mi_cmacro; | |
| 1362 | |
| 1363 /* Invalidate control macros in the #including file. */ | |
| 1364 pfile->mi_valid = false; | |
| 1365 | |
| 1366 if (file->buffer_start) | |
| 1367 { | |
| 1368 free ((void *) file->buffer_start); | |
| 1369 file->buffer_start = NULL; | |
| 1370 file->buffer = NULL; | |
| 1371 file->buffer_valid = false; | |
| 1372 } | |
| 1373 } | |
| 1374 | |
| 1375 /* Inteface to file statistics record in _cpp_file structure. */ | |
| 1376 struct stat * | |
| 1377 _cpp_get_file_stat (_cpp_file *file) | |
| 1378 { | |
| 1379 return &file->st; | |
| 1380 } | |
| 1381 | |
| 1382 /* Set the include chain for "" to QUOTE, for <> to BRACKET. If | |
| 1383 QUOTE_IGNORES_SOURCE_DIR, then "" includes do not look in the | |
| 1384 directory of the including file. | |
| 1385 | |
| 1386 If BRACKET does not lie in the QUOTE chain, it is set to QUOTE. */ | |
| 1387 void | |
| 1388 cpp_set_include_chains (cpp_reader *pfile, cpp_dir *quote, cpp_dir *bracket, | |
| 1389 int quote_ignores_source_dir) | |
| 1390 { | |
| 1391 pfile->quote_include = quote; | |
| 1392 pfile->bracket_include = quote; | |
| 1393 pfile->quote_ignores_source_dir = quote_ignores_source_dir; | |
| 1394 | |
| 1395 for (; quote; quote = quote->next) | |
| 1396 { | |
| 1397 quote->name_map = NULL; | |
| 1398 quote->len = strlen (quote->name); | |
| 1399 if (quote == bracket) | |
| 1400 pfile->bracket_include = bracket; | |
| 1401 } | |
| 1402 } | |
| 1403 | |
| 1404 /* Append the file name to the directory to create the path, but don't | |
| 1405 turn / into // or // into ///; // may be a namespace escape. */ | |
| 1406 static char * | |
| 1407 append_file_to_dir (const char *fname, cpp_dir *dir) | |
| 1408 { | |
| 1409 size_t dlen, flen; | |
| 1410 char *path; | |
| 1411 | |
| 1412 dlen = dir->len; | |
| 1413 flen = strlen (fname); | |
| 1414 path = XNEWVEC (char, dlen + 1 + flen + 1); | |
| 1415 memcpy (path, dir->name, dlen); | |
| 1416 if (dlen && path[dlen - 1] != '/') | |
| 1417 path[dlen++] = '/'; | |
| 1418 memcpy (&path[dlen], fname, flen + 1); | |
| 1419 | |
| 1420 return path; | |
| 1421 } | |
| 1422 | |
| 1423 /* Read a space delimited string of unlimited length from a stdio | |
| 1424 file F. */ | |
| 1425 static char * | |
| 1426 read_filename_string (int ch, FILE *f) | |
| 1427 { | |
| 1428 char *alloc, *set; | |
| 1429 int len; | |
| 1430 | |
| 1431 len = 20; | |
| 1432 set = alloc = XNEWVEC (char, len + 1); | |
| 1433 if (! is_space (ch)) | |
| 1434 { | |
| 1435 *set++ = ch; | |
| 1436 while ((ch = getc (f)) != EOF && ! is_space (ch)) | |
| 1437 { | |
| 1438 if (set - alloc == len) | |
| 1439 { | |
| 1440 len *= 2; | |
| 1441 alloc = XRESIZEVEC (char, alloc, len + 1); | |
| 1442 set = alloc + len / 2; | |
| 1443 } | |
| 1444 *set++ = ch; | |
| 1445 } | |
| 1446 } | |
| 1447 *set = '\0'; | |
| 1448 ungetc (ch, f); | |
| 1449 return alloc; | |
| 1450 } | |
| 1451 | |
| 1452 /* Read the file name map file for DIR. */ | |
| 1453 static void | |
| 1454 read_name_map (cpp_dir *dir) | |
| 1455 { | |
| 1456 static const char FILE_NAME_MAP_FILE[] = "header.gcc"; | |
| 1457 char *name; | |
| 1458 FILE *f; | |
| 1459 size_t len, count = 0, room = 9; | |
| 1460 | |
| 1461 len = dir->len; | |
| 1462 name = (char *) alloca (len + sizeof (FILE_NAME_MAP_FILE) + 1); | |
| 1463 memcpy (name, dir->name, len); | |
| 1464 if (len && name[len - 1] != '/') | |
| 1465 name[len++] = '/'; | |
| 1466 strcpy (name + len, FILE_NAME_MAP_FILE); | |
| 1467 f = fopen (name, "r"); | |
| 1468 | |
| 1469 dir->name_map = XNEWVEC (const char *, room); | |
| 1470 | |
| 1471 /* Silently return NULL if we cannot open. */ | |
| 1472 if (f) | |
| 1473 { | |
| 1474 int ch; | |
| 1475 | |
| 1476 while ((ch = getc (f)) != EOF) | |
| 1477 { | |
| 1478 char *to; | |
| 1479 | |
| 1480 if (is_space (ch)) | |
| 1481 continue; | |
| 1482 | |
| 1483 if (count + 2 > room) | |
| 1484 { | |
| 1485 room += 8; | |
| 1486 dir->name_map = XRESIZEVEC (const char *, dir->name_map, room); | |
| 1487 } | |
| 1488 | |
| 1489 dir->name_map[count] = read_filename_string (ch, f); | |
| 1490 while ((ch = getc (f)) != EOF && is_hspace (ch)) | |
| 1491 ; | |
| 1492 | |
| 1493 to = read_filename_string (ch, f); | |
| 1494 if (IS_ABSOLUTE_PATH (to)) | |
| 1495 dir->name_map[count + 1] = to; | |
| 1496 else | |
| 1497 { | |
| 1498 dir->name_map[count + 1] = append_file_to_dir (to, dir); | |
| 1499 free (to); | |
| 1500 } | |
| 1501 | |
| 1502 count += 2; | |
| 1503 while ((ch = getc (f)) != '\n') | |
| 1504 if (ch == EOF) | |
| 1505 break; | |
| 1506 } | |
| 1507 | |
| 1508 fclose (f); | |
| 1509 } | |
| 1510 | |
| 1511 /* Terminate the list of maps. */ | |
| 1512 dir->name_map[count] = NULL; | |
| 1513 } | |
| 1514 | |
| 1515 /* Remap a FILE's name based on the file_name_map, if any, for | |
| 1516 FILE->dir. If the file name has any directory separators, | |
| 1517 recursively check those directories too. */ | |
| 1518 static char * | |
| 1519 remap_filename (cpp_reader *pfile, _cpp_file *file) | |
| 1520 { | |
| 1521 const char *fname, *p; | |
| 1522 char *new_dir; | |
| 1523 cpp_dir *dir; | |
| 1524 size_t index, len; | |
| 1525 | |
| 1526 dir = file->dir; | |
| 1527 fname = file->name; | |
| 1528 | |
| 1529 for (;;) | |
| 1530 { | |
| 1531 if (!dir->name_map) | |
| 1532 read_name_map (dir); | |
| 1533 | |
| 1534 for (index = 0; dir->name_map[index]; index += 2) | |
| 1535 if (!strcmp (dir->name_map[index], fname)) | |
| 1536 return xstrdup (dir->name_map[index + 1]); | |
| 1537 | |
| 1538 p = strchr (fname, '/'); | |
| 1539 if (!p || p == fname) | |
| 1540 return NULL; | |
| 1541 | |
| 1542 len = dir->len + (p - fname + 1); | |
| 1543 new_dir = XNEWVEC (char, len + 1); | |
| 1544 memcpy (new_dir, dir->name, dir->len); | |
| 1545 memcpy (new_dir + dir->len, fname, p - fname + 1); | |
| 1546 new_dir[len] = '\0'; | |
| 1547 | |
| 1548 dir = make_cpp_dir (pfile, new_dir, dir->sysp); | |
| 1549 fname = p + 1; | |
| 1550 } | |
| 1551 } | |
| 1552 | |
| 1553 /* Returns true if PCHNAME is a valid PCH file for FILE. */ | |
| 1554 static bool | |
| 1555 validate_pch (cpp_reader *pfile, _cpp_file *file, const char *pchname) | |
| 1556 { | |
| 1557 const char *saved_path = file->path; | |
| 1558 bool valid = false; | |
| 1559 | |
| 1560 file->path = pchname; | |
| 1561 if (open_file (file)) | |
| 1562 { | |
| 1563 valid = 1 & pfile->cb.valid_pch (pfile, pchname, file->fd); | |
| 1564 | |
| 1565 if (!valid) | |
| 1566 { | |
| 1567 close (file->fd); | |
| 1568 file->fd = -1; | |
| 1569 } | |
| 1570 | |
| 1571 if (CPP_OPTION (pfile, print_include_names)) | |
| 1572 { | |
| 1573 unsigned int i; | |
| 1574 for (i = 1; i < pfile->line_table->depth; i++) | |
| 1575 putc ('.', stderr); | |
| 1576 fprintf (stderr, "%c %s\n", | |
| 1577 valid ? '!' : 'x', pchname); | |
| 1578 } | |
| 1579 } | |
| 1580 | |
| 1581 file->path = saved_path; | |
| 1582 return valid; | |
| 1583 } | |
| 1584 | |
| 1585 /* Get the path associated with the _cpp_file F. The path includes | |
| 1586 the base name from the include directive and the directory it was | |
| 1587 found in via the search path. */ | |
| 1588 | |
| 1589 const char * | |
| 1590 cpp_get_path (struct _cpp_file *f) | |
| 1591 { | |
| 1592 return f->path; | |
| 1593 } | |
| 1594 | |
| 1595 /* Get the directory associated with the _cpp_file F. */ | |
| 1596 | |
| 1597 cpp_dir * | |
| 1598 cpp_get_dir (struct _cpp_file *f) | |
| 1599 { | |
| 1600 return f->dir; | |
| 1601 } | |
| 1602 | |
| 1603 /* Get the cpp_buffer currently associated with the cpp_reader | |
| 1604 PFILE. */ | |
| 1605 | |
| 1606 cpp_buffer * | |
| 1607 cpp_get_buffer (cpp_reader *pfile) | |
| 1608 { | |
| 1609 return pfile->buffer; | |
| 1610 } | |
| 1611 | |
| 1612 /* Get the _cpp_file associated with the cpp_buffer B. */ | |
| 1613 | |
| 1614 _cpp_file * | |
| 1615 cpp_get_file (cpp_buffer *b) | |
| 1616 { | |
| 1617 return b->file; | |
| 1618 } | |
| 1619 | |
| 1620 /* Get the previous cpp_buffer given a cpp_buffer B. The previous | |
| 1621 buffer is the buffer that included the given buffer. */ | |
| 1622 | |
| 1623 cpp_buffer * | |
| 1624 cpp_get_prev (cpp_buffer *b) | |
| 1625 { | |
| 1626 return b->prev; | |
| 1627 } | |
| 1628 | |
| 1629 /* This data structure holds the list of header files that were seen | |
| 1630 while the PCH was being built. The 'entries' field is kept sorted | |
| 1631 in memcmp() order; yes, this means that on little-endian systems, | |
| 1632 it's sorted initially by the least-significant byte of 'size', but | |
| 1633 that's OK. The code does rely on having entries with the same size | |
| 1634 next to each other. */ | |
| 1635 | |
| 1636 struct pchf_entry { | |
| 1637 /* The size of this file. This is used to save running a MD5 checksum | |
| 1638 if the sizes don't match. */ | |
| 1639 off_t size; | |
| 1640 /* The MD5 checksum of this file. */ | |
| 1641 unsigned char sum[16]; | |
| 1642 /* Is this file to be included only once? */ | |
| 1643 bool once_only; | |
| 1644 }; | |
| 1645 | |
| 1646 struct pchf_data { | |
| 1647 /* Number of pchf_entry structures. */ | |
| 1648 size_t count; | |
| 1649 | |
| 1650 /* Are there any values with once_only set? | |
| 1651 This is used as an optimisation, it means we don't have to search | |
| 1652 the structure if we're processing a regular #include. */ | |
| 1653 bool have_once_only; | |
| 1654 | |
| 1655 struct pchf_entry entries[1]; | |
| 1656 }; | |
| 1657 | |
| 1658 static struct pchf_data *pchf; | |
| 1659 | |
| 1660 /* A qsort ordering function for pchf_entry structures. */ | |
| 1661 | |
| 1662 static int | |
| 1663 pchf_save_compare (const void *e1, const void *e2) | |
| 1664 { | |
| 1665 return memcmp (e1, e2, sizeof (struct pchf_entry)); | |
| 1666 } | |
| 1667 | |
| 1668 /* Create and write to F a pchf_data structure. */ | |
| 1669 | |
| 1670 bool | |
| 1671 _cpp_save_file_entries (cpp_reader *pfile, FILE *fp) | |
| 1672 { | |
| 1673 size_t count = 0; | |
| 1674 struct pchf_data *result; | |
| 1675 size_t result_size; | |
| 1676 _cpp_file *f; | |
| 1677 | |
| 1678 for (f = pfile->all_files; f; f = f->next_file) | |
| 1679 ++count; | |
| 1680 | |
| 1681 result_size = (sizeof (struct pchf_data) | |
| 1682 + sizeof (struct pchf_entry) * (count - 1)); | |
| 1683 result = XCNEWVAR (struct pchf_data, result_size); | |
| 1684 | |
| 1685 result->count = 0; | |
| 1686 result->have_once_only = false; | |
| 1687 | |
| 1688 for (f = pfile->all_files; f; f = f->next_file) | |
| 1689 { | |
| 1690 size_t count; | |
| 1691 | |
| 1692 /* This should probably never happen, since if a read error occurred | |
| 1693 the PCH file shouldn't be written... */ | |
| 1694 if (f->dont_read || f->err_no) | |
| 1695 continue; | |
| 1696 | |
| 1697 if (f->stack_count == 0) | |
| 1698 continue; | |
| 1699 | |
| 1700 count = result->count++; | |
| 1701 | |
| 1702 result->entries[count].once_only = f->once_only; | |
| 1703 /* |= is avoided in the next line because of an HP C compiler bug */ | |
| 1704 result->have_once_only = result->have_once_only | f->once_only; | |
| 1705 if (f->buffer_valid) | |
| 1706 md5_buffer ((const char *)f->buffer, | |
| 1707 f->st.st_size, result->entries[count].sum); | |
| 1708 else | |
| 1709 { | |
| 1710 FILE *ff; | |
| 1711 int oldfd = f->fd; | |
| 1712 | |
| 1713 if (!open_file (f)) | |
| 1714 { | |
| 1715 open_file_failed (pfile, f, 0); | |
| 1716 return false; | |
| 1717 } | |
| 1718 ff = fdopen (f->fd, "rb"); | |
| 1719 md5_stream (ff, result->entries[count].sum); | |
| 1720 fclose (ff); | |
| 1721 f->fd = oldfd; | |
| 1722 } | |
| 1723 result->entries[count].size = f->st.st_size; | |
| 1724 } | |
| 1725 | |
| 1726 result_size = (sizeof (struct pchf_data) | |
| 1727 + sizeof (struct pchf_entry) * (result->count - 1)); | |
| 1728 | |
| 1729 qsort (result->entries, result->count, sizeof (struct pchf_entry), | |
| 1730 pchf_save_compare); | |
| 1731 | |
| 1732 return fwrite (result, result_size, 1, fp) == 1; | |
| 1733 } | |
| 1734 | |
| 1735 /* Read the pchf_data structure from F. */ | |
| 1736 | |
| 1737 bool | |
| 1738 _cpp_read_file_entries (cpp_reader *pfile ATTRIBUTE_UNUSED, FILE *f) | |
| 1739 { | |
| 1740 struct pchf_data d; | |
| 1741 | |
| 1742 if (fread (&d, sizeof (struct pchf_data) - sizeof (struct pchf_entry), 1, f) | |
| 1743 != 1) | |
| 1744 return false; | |
| 1745 | |
| 1746 pchf = XNEWVAR (struct pchf_data, sizeof (struct pchf_data) | |
| 1747 + sizeof (struct pchf_entry) * (d.count - 1)); | |
| 1748 memcpy (pchf, &d, sizeof (struct pchf_data) - sizeof (struct pchf_entry)); | |
| 1749 if (fread (pchf->entries, sizeof (struct pchf_entry), d.count, f) | |
| 1750 != d.count) | |
| 1751 return false; | |
| 1752 return true; | |
| 1753 } | |
| 1754 | |
| 1755 /* The parameters for pchf_compare. */ | |
| 1756 | |
| 1757 struct pchf_compare_data | |
| 1758 { | |
| 1759 /* The size of the file we're looking for. */ | |
| 1760 off_t size; | |
| 1761 | |
| 1762 /* The MD5 checksum of the file, if it's been computed. */ | |
| 1763 unsigned char sum[16]; | |
| 1764 | |
| 1765 /* Is SUM valid? */ | |
| 1766 bool sum_computed; | |
| 1767 | |
| 1768 /* Do we need to worry about entries that don't have ONCE_ONLY set? */ | |
| 1769 bool check_included; | |
| 1770 | |
| 1771 /* The file that we're searching for. */ | |
| 1772 _cpp_file *f; | |
| 1773 }; | |
| 1774 | |
| 1775 /* bsearch comparison function; look for D_P in E_P. */ | |
| 1776 | |
| 1777 static int | |
| 1778 pchf_compare (const void *d_p, const void *e_p) | |
| 1779 { | |
| 1780 const struct pchf_entry *e = (const struct pchf_entry *)e_p; | |
| 1781 struct pchf_compare_data *d = (struct pchf_compare_data *)d_p; | |
| 1782 int result; | |
| 1783 | |
| 1784 result = memcmp (&d->size, &e->size, sizeof (off_t)); | |
| 1785 if (result != 0) | |
| 1786 return result; | |
| 1787 | |
| 1788 if (! d->sum_computed) | |
| 1789 { | |
| 1790 _cpp_file *const f = d->f; | |
| 1791 | |
| 1792 md5_buffer ((const char *)f->buffer, f->st.st_size, d->sum); | |
| 1793 d->sum_computed = true; | |
| 1794 } | |
| 1795 | |
| 1796 result = memcmp (d->sum, e->sum, 16); | |
| 1797 if (result != 0) | |
| 1798 return result; | |
| 1799 | |
| 1800 if (d->check_included || e->once_only) | |
| 1801 return 0; | |
| 1802 else | |
| 1803 return 1; | |
| 1804 } | |
| 1805 | |
| 1806 /* Check that F is not in a list read from a PCH file (if any). | |
| 1807 Assumes that f->buffer_valid is true. Return TRUE if the file | |
| 1808 should not be read. */ | |
| 1809 | |
| 1810 static bool | |
| 1811 check_file_against_entries (cpp_reader *pfile ATTRIBUTE_UNUSED, | |
| 1812 _cpp_file *f, | |
| 1813 bool check_included) | |
| 1814 { | |
| 1815 struct pchf_compare_data d; | |
| 1816 | |
| 1817 if (pchf == NULL | |
| 1818 || (! check_included && ! pchf->have_once_only)) | |
| 1819 return false; | |
| 1820 | |
| 1821 d.size = f->st.st_size; | |
| 1822 d.sum_computed = false; | |
| 1823 d.f = f; | |
| 1824 d.check_included = check_included; | |
| 1825 return bsearch (&d, pchf->entries, pchf->count, sizeof (struct pchf_entry), | |
| 1826 pchf_compare) != NULL; | |
| 1827 } |