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Diffstat (limited to 'libcpp/files.c')
| -rw-r--r-- | libcpp/files.c | 2174 |
1 files changed, 0 insertions, 2174 deletions
diff --git a/libcpp/files.c b/libcpp/files.c deleted file mode 100644 index 24208f7..0000000 --- a/libcpp/files.c +++ /dev/null @@ -1,2174 +0,0 @@ -/* Part of CPP library. File handling. - Copyright (C) 1986-2022 Free Software Foundation, Inc. - Written by Per Bothner, 1994. - Based on CCCP program by Paul Rubin, June 1986 - Adapted to ANSI C, Richard Stallman, Jan 1987 - Split out of cpplib.c, Zack Weinberg, Oct 1998 - Reimplemented, Neil Booth, Jul 2003 - -This program is free software; you can redistribute it and/or modify it -under the terms of the GNU General Public License as published by the -Free Software Foundation; either version 3, or (at your option) any -later version. - -This program is distributed in the hope that it will be useful, -but WITHOUT ANY WARRANTY; without even the implied warranty of -MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -GNU General Public License for more details. - -You should have received a copy of the GNU General Public License -along with this program; see the file COPYING3. If not see -<http://www.gnu.org/licenses/>. */ - -#include "config.h" -#include "system.h" -#include "cpplib.h" -#include "internal.h" -#include "mkdeps.h" -#include "obstack.h" -#include "hashtab.h" -#include "md5.h" -#include <dirent.h> - -/* Variable length record files on VMS will have a stat size that includes - record control characters that won't be included in the read size. */ -#ifdef VMS -# define FAB_C_VAR 2 /* variable length records (see Starlet fabdef.h) */ -# define STAT_SIZE_RELIABLE(ST) ((ST).st_fab_rfm != FAB_C_VAR) -#else -# define STAT_SIZE_RELIABLE(ST) true -#endif - -#ifdef __DJGPP__ -#include <io.h> - /* For DJGPP redirected input is opened in text mode. */ -# define set_stdin_to_binary_mode() \ - if (! isatty (0)) setmode (0, O_BINARY) -#else -# define set_stdin_to_binary_mode() /* Nothing */ -#endif - -/* This structure represents a file searched for by CPP, whether it - exists or not. An instance may be pointed to by more than one - cpp_file_hash_entry; at present no reference count is kept. */ -struct _cpp_file -{ - /* Filename as given to #include or command line switch. */ - const char *name; - - /* The full path used to find the file. */ - const char *path; - - /* The full path of the pch file. */ - const char *pchname; - - /* The file's path with the basename stripped. NULL if it hasn't - been calculated yet. */ - const char *dir_name; - - /* Chain through all files. */ - struct _cpp_file *next_file; - - /* The contents of NAME after calling read_file(). */ - const uchar *buffer; - - /* Pointer to the real start of BUFFER. read_file() might increment - BUFFER; when freeing, this this pointer must be used instead. */ - const uchar *buffer_start; - - /* The macro, if any, preventing re-inclusion. */ - const cpp_hashnode *cmacro; - - /* The directory in the search path where FILE was found. Used for - #include_next and determining whether a header is a system - header. */ - cpp_dir *dir; - - /* As filled in by stat(2) for the file. */ - struct stat st; - - /* File descriptor. Invalid if -1, otherwise open. */ - int fd; - - /* Zero if this file was successfully opened and stat()-ed, - otherwise errno obtained from failure. */ - int err_no; - - /* Number of times the file has been stacked for preprocessing. */ - unsigned short stack_count; - - /* If opened with #import or contains #pragma once. */ - bool once_only : 1; - - /* If read() failed before. */ - bool dont_read : 1; - - /* If BUFFER above contains the true contents of the file. */ - bool buffer_valid : 1; - - /* If this file is implicitly preincluded. */ - bool implicit_preinclude : 1; - - /* > 0: Known C++ Module header unit, <0: known not. ==0, unknown */ - int header_unit : 2; -}; - -/* A singly-linked list for all searches for a given file name, with - its head pointed to by a slot in FILE_HASH. The file name is what - appeared between the quotes in a #include directive; it can be - determined implicitly from the hash table location or explicitly - from FILE->name. - - FILE is a structure containing details about the file that was - found with that search, or details of how the search failed. - - START_DIR is the starting location of the search in the include - chain. The current directories for "" includes are also hashed in - the hash table and therefore unique. Files that are looked up - without using a search path, such as absolute filenames and file - names from the command line share a special starting directory so - they don't cause cache hits with normal include-chain lookups. - - If START_DIR is NULL then the entry is for a directory, not a file, - and the directory is in DIR. Since the starting point in a file - lookup chain is never NULL, this means that simple pointer - comparisons against START_DIR can be made to determine cache hits - in file lookups. - - If a cache lookup fails because of e.g. an extra "./" in the path, - then nothing will break. It is just less efficient as CPP will - have to do more work re-preprocessing the file, and/or comparing - its contents against earlier once-only files. -*/ -struct cpp_file_hash_entry -{ - struct cpp_file_hash_entry *next; - cpp_dir *start_dir; - location_t location; - union - { - _cpp_file *file; - cpp_dir *dir; - } u; -}; - -/* Number of entries to put in a cpp_file_hash_entry pool. */ -#define FILE_HASH_POOL_SIZE 127 - -/* A file hash entry pool. We allocate cpp_file_hash_entry object from - one of these. */ -struct file_hash_entry_pool -{ - /* Number of entries used from this pool. */ - unsigned int file_hash_entries_used; - /* Next pool in the chain; used when freeing. */ - struct file_hash_entry_pool *next; - /* The memory pool. */ - struct cpp_file_hash_entry pool[FILE_HASH_POOL_SIZE]; -}; - -static bool open_file (_cpp_file *file); -static bool pch_open_file (cpp_reader *pfile, _cpp_file *file, - bool *invalid_pch); -static bool find_file_in_dir (cpp_reader *pfile, _cpp_file *file, - bool *invalid_pch, location_t loc); -static bool read_file_guts (cpp_reader *pfile, _cpp_file *file, - location_t loc, const char *input_charset); -static bool read_file (cpp_reader *pfile, _cpp_file *file, - location_t loc); -static struct cpp_dir *search_path_head (cpp_reader *, const char *fname, - int angle_brackets, enum include_type); -static const char *dir_name_of_file (_cpp_file *file); -static void open_file_failed (cpp_reader *pfile, _cpp_file *file, int, - location_t); -static struct cpp_file_hash_entry *search_cache (struct cpp_file_hash_entry *head, - const cpp_dir *start_dir); -static _cpp_file *make_cpp_file (cpp_dir *, const char *fname); -static void destroy_cpp_file (_cpp_file *); -static cpp_dir *make_cpp_dir (cpp_reader *, const char *dir_name, int sysp); -static void allocate_file_hash_entries (cpp_reader *pfile); -static struct cpp_file_hash_entry *new_file_hash_entry (cpp_reader *pfile); -static int report_missing_guard (void **slot, void *b); -static hashval_t file_hash_hash (const void *p); -static int file_hash_eq (const void *p, const void *q); -static char *read_filename_string (int ch, FILE *f); -static void read_name_map (cpp_dir *dir); -static char *remap_filename (cpp_reader *pfile, _cpp_file *file); -static char *append_file_to_dir (const char *fname, cpp_dir *dir); -static bool validate_pch (cpp_reader *, _cpp_file *file, const char *pchname); -static int pchf_save_compare (const void *e1, const void *e2); -static int pchf_compare (const void *d_p, const void *e_p); -static bool check_file_against_entries (cpp_reader *, _cpp_file *, bool); - -/* Given a filename in FILE->PATH, with the empty string interpreted - as <stdin>, open it. - - On success FILE contains an open file descriptor and stat - information for the file. On failure the file descriptor is -1 and - the appropriate errno is also stored in FILE. Returns TRUE iff - successful. - - We used to open files in nonblocking mode, but that caused more - problems than it solved. Do take care not to acquire a controlling - terminal by mistake (this can't happen on sane systems, but - paranoia is a virtue). - - Use the three-argument form of open even though we aren't - specifying O_CREAT, to defend against broken system headers. - - O_BINARY tells some runtime libraries (notably DJGPP) not to do - newline translation; we can handle DOS line breaks just fine - ourselves. */ -static bool -open_file (_cpp_file *file) -{ - if (file->path[0] == '\0') - { - file->fd = 0; - set_stdin_to_binary_mode (); - } - else - file->fd = open (file->path, O_RDONLY | O_NOCTTY | O_BINARY, 0666); - - if (file->fd != -1) - { - if (fstat (file->fd, &file->st) == 0) - { - if (!S_ISDIR (file->st.st_mode)) - { - file->err_no = 0; - return true; - } - - /* Ignore a directory and continue the search. The file we're - looking for may be elsewhere in the search path. */ - errno = ENOENT; - } - - close (file->fd); - file->fd = -1; - } -#if defined(_WIN32) && !defined(__CYGWIN__) - else if (errno == EACCES) - { - /* On most UNIX systems, open succeeds on a directory. Above, - we check if we have opened a directory and if so, set errno - to ENOENT. However, on Windows, opening a directory - fails with EACCES. We want to return ENOENT in that - case too. */ - if (stat (file->path, &file->st) == 0 - && S_ISDIR (file->st.st_mode)) - errno = ENOENT; - else - /* The call to stat may have reset errno. */ - errno = EACCES; - } -#endif - else if (errno == ENOTDIR) - errno = ENOENT; - - file->err_no = errno; - - return false; -} - -/* Temporary PCH intercept of opening a file. Try to find a PCH file - based on FILE->name and FILE->dir, and test those found for - validity using PFILE->cb.valid_pch. Return true iff a valid file is - found. Set *INVALID_PCH if a PCH file is found but wasn't valid. */ - -static bool -pch_open_file (cpp_reader *pfile, _cpp_file *file, bool *invalid_pch) -{ - static const char extension[] = ".gch"; - const char *path = file->path; - size_t len, flen; - char *pchname; - struct stat st; - bool valid = false; - - /* No PCH on <stdin> or if not requested. */ - if (file->name[0] == '\0' || !pfile->cb.valid_pch) - return false; - - /* If the file is not included as first include from either the toplevel - file or the command-line it is not a valid use of PCH. */ - for (_cpp_file *f = pfile->all_files; f; f = f->next_file) - if (f->implicit_preinclude) - continue; - else if (pfile->main_file == f) - break; - else - return false; - - flen = strlen (path); - len = flen + sizeof (extension); - pchname = XNEWVEC (char, len); - memcpy (pchname, path, flen); - memcpy (pchname + flen, extension, sizeof (extension)); - - if (stat (pchname, &st) == 0) - { - DIR *pchdir; - struct dirent *d; - size_t dlen, plen = len; - - if (!S_ISDIR (st.st_mode)) - valid = validate_pch (pfile, file, pchname); - else if ((pchdir = opendir (pchname)) != NULL) - { - pchname[plen - 1] = '/'; - while ((d = readdir (pchdir)) != NULL) - { - dlen = strlen (d->d_name) + 1; - if ((strcmp (d->d_name, ".") == 0) - || (strcmp (d->d_name, "..") == 0)) - continue; - if (dlen + plen > len) - { - len += dlen + 64; - pchname = XRESIZEVEC (char, pchname, len); - } - memcpy (pchname + plen, d->d_name, dlen); - valid = validate_pch (pfile, file, pchname); - if (valid) - break; - } - closedir (pchdir); - } - if (!valid) - *invalid_pch = true; - } - - if (valid) - file->pchname = pchname; - else - free (pchname); - - return valid; -} - -/* Canonicalize the path to FILE. Return the canonical form if it is - shorter, otherwise return NULL. This function does NOT free the - memory pointed by FILE. */ - -static char * -maybe_shorter_path (const char * file) -{ - char * file2 = lrealpath (file); - if (file2 && strlen (file2) < strlen (file)) - { - return file2; - } - else - { - free (file2); - return NULL; - } -} - -/* Try to open the path FILE->name appended to FILE->dir. This is - where remap and PCH intercept the file lookup process. Return true - if the file was found, whether or not the open was successful. - Set *INVALID_PCH to true if a PCH file is found but wasn't valid. - Use LOC when emitting any diagnostics. */ - -static bool -find_file_in_dir (cpp_reader *pfile, _cpp_file *file, bool *invalid_pch, - location_t loc) -{ - char *path; - - if (CPP_OPTION (pfile, remap) && (path = remap_filename (pfile, file))) - ; - else - if (file->dir->construct) - path = file->dir->construct (file->name, file->dir); - else - path = append_file_to_dir (file->name, file->dir); - - if (path) - { - hashval_t hv; - char *copy; - void **pp; - - /* We try to canonicalize system headers. For DOS based file - * system, we always try to shorten non-system headers, as DOS - * has a tighter constraint on max path length. */ - if ((CPP_OPTION (pfile, canonical_system_headers) && file->dir->sysp) -#ifdef HAVE_DOS_BASED_FILE_SYSTEM - || !file->dir->sysp -#endif - ) - { - char * canonical_path = maybe_shorter_path (path); - if (canonical_path) - { - /* The canonical path was newly allocated. Let's free the - non-canonical one. */ - free (path); - path = canonical_path; - } - } - - hv = htab_hash_string (path); - if (htab_find_with_hash (pfile->nonexistent_file_hash, path, hv) != NULL) - { - file->err_no = ENOENT; - return false; - } - - file->path = path; - if (pch_open_file (pfile, file, invalid_pch)) - return true; - - if (open_file (file)) - return true; - - if (file->err_no != ENOENT) - { - open_file_failed (pfile, file, 0, loc); - return true; - } - - /* We copy the path name onto an obstack partly so that we don't - leak the memory, but mostly so that we don't fragment the - heap. */ - copy = (char *) obstack_copy0 (&pfile->nonexistent_file_ob, path, - strlen (path)); - free (path); - pp = htab_find_slot_with_hash (pfile->nonexistent_file_hash, - copy, hv, INSERT); - *pp = copy; - - file->path = file->name; - } - else - { - file->err_no = ENOENT; - file->path = NULL; - } - - return false; -} - -/* Return true iff the missing_header callback found the given HEADER. */ -static bool -search_path_exhausted (cpp_reader *pfile, const char *header, _cpp_file *file) -{ - missing_header_cb func = pfile->cb.missing_header; - - /* When the regular search path doesn't work, try context dependent - headers search paths. */ - if (func - && file->dir == NULL) - { - if ((file->path = func (pfile, header, &file->dir)) != NULL) - { - if (open_file (file)) - return true; - free ((void *)file->path); - } - file->path = file->name; - } - - return false; -} - -bool -_cpp_find_failed (_cpp_file *file) -{ - return file->err_no != 0; -} - -/* Given a filename FNAME search for such a file in the include path - starting from START_DIR. If FNAME is the empty string it is - interpreted as STDIN if START_DIR is PFILE->no_search_path. - - If the file is not found in the file cache fall back to the O/S and - add the result to our cache. - - If the file was not found in the filesystem, or there was an error - opening it, then ERR_NO is nonzero and FD is -1. If the file was - found, then ERR_NO is zero and FD could be -1 or an open file - descriptor. FD can be -1 if the file was found in the cache and - had previously been closed. To open it again pass the return value - to open_file(). - - If KIND is _cpp_FFK_PRE_INCLUDE then it is OK for the file to be - missing. If present, it is OK for a precompiled header to be - included after it. - - Use LOC as the location for any errors. */ - -_cpp_file * -_cpp_find_file (cpp_reader *pfile, const char *fname, cpp_dir *start_dir, - int angle_brackets, _cpp_find_file_kind kind, location_t loc) -{ - bool invalid_pch = false; - bool saw_bracket_include = false; - bool saw_quote_include = false; - struct cpp_dir *found_in_cache = NULL; - - /* Ensure we get no confusion between cached files and directories. */ - if (start_dir == NULL) - cpp_error_at (pfile, CPP_DL_ICE, loc, "NULL directory in find_file"); - - void **hash_slot - = htab_find_slot_with_hash (pfile->file_hash, fname, - htab_hash_string (fname), INSERT); - - /* First check the cache before we resort to memory allocation. */ - cpp_file_hash_entry *entry - = search_cache ((struct cpp_file_hash_entry *) *hash_slot, start_dir); - if (entry) - return entry->u.file; - - _cpp_file *file = make_cpp_file (start_dir, fname); - file->implicit_preinclude - = (kind == _cpp_FFK_PRE_INCLUDE - || (pfile->buffer && pfile->buffer->file->implicit_preinclude)); - - if (kind != _cpp_FFK_FAKE) - /* Try each path in the include chain. */ - for (;;) - { - if (find_file_in_dir (pfile, file, &invalid_pch, loc)) - break; - - file->dir = file->dir->next; - if (file->dir == NULL) - { - if (search_path_exhausted (pfile, fname, file)) - { - /* Although this file must not go in the cache, - because the file found might depend on things (like - the current file) that aren't represented in the - cache, it still has to go in the list of all files - so that #import works. */ - file->next_file = pfile->all_files; - pfile->all_files = file; - if (*hash_slot == NULL) - { - /* If *hash_slot is NULL, the above - htab_find_slot_with_hash call just created the - slot, but we aren't going to store there anything - of use, so need to remove the newly created entry. - htab_clear_slot requires that it is non-NULL, so - store some non-NULL but valid pointer there, - htab_clear_slot will immediately overwrite it. */ - *hash_slot = file; - htab_clear_slot (pfile->file_hash, hash_slot); - } - return file; - } - - if (invalid_pch) - { - cpp_error (pfile, CPP_DL_ERROR, - "one or more PCH files were found," - " but they were invalid"); - if (!cpp_get_options (pfile)->warn_invalid_pch) - cpp_error (pfile, CPP_DL_NOTE, - "use -Winvalid-pch for more information"); - } - - if (kind == _cpp_FFK_PRE_INCLUDE) - { - free ((char *) file->name); - free (file); - if (*hash_slot == NULL) - { - /* See comment on the above htab_clear_slot call. */ - *hash_slot = &hash_slot; - htab_clear_slot (pfile->file_hash, hash_slot); - } - return NULL; - } - - if (kind != _cpp_FFK_HAS_INCLUDE) - open_file_failed (pfile, file, angle_brackets, loc); - break; - } - - /* Only check the cache for the starting location (done above) - and the quote and bracket chain heads because there are no - other possible starting points for searches. */ - if (file->dir == pfile->bracket_include) - saw_bracket_include = true; - else if (file->dir == pfile->quote_include) - saw_quote_include = true; - else - continue; - - entry - = search_cache ((struct cpp_file_hash_entry *) *hash_slot, file->dir); - if (entry) - { - found_in_cache = file->dir; - break; - } - } - - if (entry) - { - /* Cache for START_DIR too, sharing the _cpp_file structure. */ - free ((char *) file->name); - free (file); - file = entry->u.file; - } - else - { - /* This is a new file; put it in the list. */ - file->next_file = pfile->all_files; - pfile->all_files = file; - } - - /* Store this new result in the hash table. */ - entry = new_file_hash_entry (pfile); - entry->next = (struct cpp_file_hash_entry *) *hash_slot; - entry->start_dir = start_dir; - entry->location = loc; - entry->u.file = file; - *hash_slot = (void *) entry; - - /* If we passed the quote or bracket chain heads, cache them also. - This speeds up processing if there are lots of -I options. */ - if (saw_bracket_include - && pfile->bracket_include != start_dir - && found_in_cache != pfile->bracket_include) - { - entry = new_file_hash_entry (pfile); - entry->next = (struct cpp_file_hash_entry *) *hash_slot; - entry->start_dir = pfile->bracket_include; - entry->location = loc; - entry->u.file = file; - *hash_slot = (void *) entry; - } - if (saw_quote_include - && pfile->quote_include != start_dir - && found_in_cache != pfile->quote_include) - { - entry = new_file_hash_entry (pfile); - entry->next = (struct cpp_file_hash_entry *) *hash_slot; - entry->start_dir = pfile->quote_include; - entry->location = loc; - entry->u.file = file; - *hash_slot = (void *) entry; - } - - return file; -} - -/* Read a file into FILE->buffer, returning true on success. - - If FILE->fd is something weird, like a block device, we don't want - to read it at all. Don't even try to figure out what something is, - except for plain files and block devices, since there is no - reliable portable way of doing this. - - Use LOC for any diagnostics. - - PFILE may be NULL. In this case, no diagnostics are issued. - - FIXME: Flush file cache and try again if we run out of memory. */ -static bool -read_file_guts (cpp_reader *pfile, _cpp_file *file, location_t loc, - const char *input_charset) -{ - ssize_t size, total, count; - uchar *buf; - bool regular; - - if (S_ISBLK (file->st.st_mode)) - { - if (pfile) - cpp_error_at (pfile, CPP_DL_ERROR, loc, - "%s is a block device", file->path); - return false; - } - - regular = S_ISREG (file->st.st_mode) != 0; - if (regular) - { - /* off_t might have a wider range than ssize_t - in other words, - the max size of a file might be bigger than the address - space. We can't handle a file that large. (Anyone with - a single source file bigger than 2GB needs to rethink - their coding style.) Some systems (e.g. AIX 4.1) define - SSIZE_MAX to be much smaller than the actual range of the - type. Use INTTYPE_MAXIMUM unconditionally to ensure this - does not bite us. */ - if (file->st.st_size > INTTYPE_MAXIMUM (ssize_t)) - { - if (pfile) - cpp_error_at (pfile, CPP_DL_ERROR, loc, - "%s is too large", file->path); - return false; - } - - size = file->st.st_size; - } - else - /* 8 kilobytes is a sensible starting size. It ought to be bigger - than the kernel pipe buffer, and it's definitely bigger than - the majority of C source files. */ - size = 8 * 1024; - - /* The + 16 here is space for the final '\n' and 15 bytes of padding, - used to quiet warnings from valgrind or Address Sanitizer, when the - optimized lexer accesses aligned 16-byte memory chunks, including - the bytes after the malloced, area, and stops lexing on '\n'. */ - buf = XNEWVEC (uchar, size + 16); - total = 0; - while ((count = read (file->fd, buf + total, size - total)) > 0) - { - total += count; - - if (total == size) - { - if (regular) - break; - size *= 2; - buf = XRESIZEVEC (uchar, buf, size + 16); - } - } - - if (count < 0) - { - if (pfile) - cpp_errno_filename (pfile, CPP_DL_ERROR, file->path, loc); - free (buf); - return false; - } - - if (pfile && regular && total != size && STAT_SIZE_RELIABLE (file->st)) - cpp_error_at (pfile, CPP_DL_WARNING, loc, - "%s is shorter than expected", file->path); - - file->buffer = _cpp_convert_input (pfile, - input_charset, - buf, size + 16, total, - &file->buffer_start, - &file->st.st_size); - file->buffer_valid = file->buffer; - return file->buffer_valid; -} - -/* Convenience wrapper around read_file_guts that opens the file if - necessary and closes the file descriptor after reading. FILE must - have been passed through find_file() at some stage. Use LOC for - any diagnostics. Unlike read_file_guts(), PFILE may not be NULL. */ -static bool -read_file (cpp_reader *pfile, _cpp_file *file, location_t loc) -{ - /* If we already have its contents in memory, succeed immediately. */ - if (file->buffer_valid) - return true; - - /* If an earlier read failed for some reason don't try again. */ - if (file->dont_read || file->err_no) - return false; - - if (file->fd == -1 && !open_file (file)) - { - open_file_failed (pfile, file, 0, loc); - return false; - } - - file->dont_read = !read_file_guts (pfile, file, loc, - CPP_OPTION (pfile, input_charset)); - close (file->fd); - file->fd = -1; - - return !file->dont_read; -} - -/* Returns TRUE if FILE is already known to be idempotent, and should - therefore not be read again. */ -static bool -is_known_idempotent_file (cpp_reader *pfile, _cpp_file *file, bool import) -{ - /* Skip once-only files. */ - if (file->once_only) - return true; - - /* We must mark the file once-only if #import now, before header - guard checks. Otherwise, undefining the header guard might - cause the file to be re-stacked. */ - if (import) - { - _cpp_mark_file_once_only (pfile, file); - - /* Don't stack files that have been stacked before. */ - if (file->stack_count) - return true; - } - - /* Skip if the file had a header guard and the macro is defined. - PCH relies on this appearing before the PCH handler below. */ - if (file->cmacro && cpp_macro_p (file->cmacro)) - return true; - - /* Handle PCH files immediately; don't stack them. */ - if (file->pchname) - { - pfile->cb.read_pch (pfile, file->pchname, file->fd, file->path); - file->fd = -1; - free ((void *) file->pchname); - file->pchname = NULL; - return true; - } - - return false; -} - -/* Return TRUE if file has unique contents, so we should read process - it. The file's contents must already have been read. */ - -static bool -has_unique_contents (cpp_reader *pfile, _cpp_file *file, bool import, - location_t loc) -{ - /* Check the file against the PCH file. This is done before - checking against files we've already seen, since it may save on - I/O. */ - if (check_file_against_entries (pfile, file, import)) - { - /* If this isn't a #import, but yet we can't include the file, - that means that it was #import-ed in the PCH file, - so we can never include it again. */ - if (! import) - _cpp_mark_file_once_only (pfile, file); - return false; - } - - /* Now we've read the file's contents, we can stack it if there - are no once-only files. */ - if (!pfile->seen_once_only) - return true; - - /* We may have read the file under a different name. Look - for likely candidates and compare file contents to be sure. */ - for (_cpp_file *f = pfile->all_files; f; f = f->next_file) - { - if (f == file) - continue; /* It'sa me! */ - - if ((import || f->once_only) - && f->err_no == 0 - && f->st.st_mtime == file->st.st_mtime - && f->st.st_size == file->st.st_size) - { - _cpp_file *ref_file; - - if (f->buffer && !f->buffer_valid) - { - /* We already have a buffer but it is not valid, because - the file is still stacked. Make a new one. */ - ref_file = make_cpp_file (f->dir, f->name); - ref_file->path = f->path; - } - else - /* The file is not stacked anymore. We can reuse it. */ - ref_file = f; - - bool same_file_p = (read_file (pfile, ref_file, loc) - /* Size might have changed in read_file(). */ - && ref_file->st.st_size == file->st.st_size - && !memcmp (ref_file->buffer, file->buffer, - file->st.st_size)); - - if (f->buffer && !f->buffer_valid) - { - ref_file->path = 0; - destroy_cpp_file (ref_file); - } - - if (same_file_p) - /* Already seen under a different name. */ - return false; - } - } - - return true; -} - -/* Place the file referenced by FILE into a new buffer on the buffer - stack if possible. Returns true if a buffer is stacked. Use LOC - for any diagnostics. */ - -bool -_cpp_stack_file (cpp_reader *pfile, _cpp_file *file, include_type type, - location_t loc) -{ - if (is_known_idempotent_file (pfile, file, type == IT_IMPORT)) - return false; - - int sysp = 0; - char *buf = nullptr; - - /* Check C++ module include translation. */ - if (!file->header_unit && type < IT_HEADER_HWM - /* Do not include translate include-next. */ - && type != IT_INCLUDE_NEXT - && pfile->cb.translate_include) - buf = (pfile->cb.translate_include - (pfile, pfile->line_table, loc, file->path)); - - if (buf) - { - /* We don't increment the line number at the end of a buffer, - because we don't usually need that location (we're popping an - include file). However in this case we do want to do the - increment. So push a writable buffer of two newlines to acheive - that. (We also need an extra newline, so this looks like a regular - file, which we do that to to make sure we don't fall off the end in the - middle of a line. */ - static uchar newlines[] = "\n\n\n"; - cpp_push_buffer (pfile, newlines, 2, true); - - size_t len = strlen (buf); - buf[len] = '\n'; /* See above */ - cpp_buffer *buffer - = cpp_push_buffer (pfile, reinterpret_cast<unsigned char *> (buf), - len, true); - buffer->to_free = buffer->buf; - - file->header_unit = +1; - _cpp_mark_file_once_only (pfile, file); - } - else - { - /* Not a header unit, and we know it. */ - file->header_unit = -1; - - if (!read_file (pfile, file, loc)) - return false; - - if (!has_unique_contents (pfile, file, type == IT_IMPORT, loc)) - return false; - - if (pfile->buffer && file->dir) - sysp = MAX (pfile->buffer->sysp, file->dir->sysp); - - /* Add the file to the dependencies on its first inclusion. */ - if (CPP_OPTION (pfile, deps.style) > (sysp != 0) - && !file->stack_count - && file->path[0] - && !(pfile->main_file == file - && CPP_OPTION (pfile, deps.ignore_main_file))) - deps_add_dep (pfile->deps, file->path); - - /* Clear buffer_valid since _cpp_clean_line messes it up. */ - file->buffer_valid = false; - file->stack_count++; - - /* Stack the buffer. */ - cpp_buffer *buffer - = cpp_push_buffer (pfile, file->buffer, file->st.st_size, - CPP_OPTION (pfile, preprocessed) - && !CPP_OPTION (pfile, directives_only)); - buffer->file = file; - buffer->sysp = sysp; - buffer->to_free = file->buffer_start; - - /* Initialize controlling macro state. */ - pfile->mi_valid = true; - pfile->mi_cmacro = 0; - } - - /* In the case of a normal #include, we're now at the start of the - line *following* the #include. A separate location_t for this - location makes no sense, until we do the LC_LEAVE. - - This does not apply if we found a PCH file, we're not a regular - include, or we ran out of locations. */ - bool decrement = (file->pchname == NULL - && type < IT_DIRECTIVE_HWM - && (pfile->line_table->highest_location - != LINE_MAP_MAX_LOCATION - 1)); - if (decrement) - pfile->line_table->highest_location--; - - if (file->header_unit <= 0) - /* Add line map and do callbacks. */ - _cpp_do_file_change (pfile, LC_ENTER, file->path, - /* With preamble injection, start on line zero, - so the preamble doesn't appear to have been - included from line 1. Likewise when - starting preprocessed, we expect an initial - locating line. */ - type == IT_PRE_MAIN ? 0 : 1, sysp); - else if (decrement) - { - /* Adjust the line back one so we appear on the #include line itself. */ - const line_map_ordinary *map - = LINEMAPS_LAST_ORDINARY_MAP (pfile->line_table); - linenum_type line = SOURCE_LINE (map, pfile->line_table->highest_line); - linemap_line_start (pfile->line_table, line - 1, 0); - } - - return true; -} - -/* Mark FILE to be included once only. */ -void -_cpp_mark_file_once_only (cpp_reader *pfile, _cpp_file *file) -{ - pfile->seen_once_only = true; - file->once_only = true; -} - -/* Return the directory from which searching for FNAME should start, - considering the directive TYPE and ANGLE_BRACKETS. If there is - nothing left in the path, returns NULL. */ -static struct cpp_dir * -search_path_head (cpp_reader *pfile, const char *fname, int angle_brackets, - enum include_type type) -{ - cpp_dir *dir; - _cpp_file *file; - - if (IS_ABSOLUTE_PATH (fname)) - return &pfile->no_search_path; - - /* pfile->buffer is NULL when processing an -include command-line flag. */ - file = pfile->buffer == NULL ? pfile->main_file : pfile->buffer->file; - - /* For #include_next, skip in the search path past the dir in which - the current file was found, but if it was found via an absolute - path use the normal search logic. */ - if (type == IT_INCLUDE_NEXT && file->dir - && file->dir != &pfile->no_search_path) - dir = file->dir->next; - else if (angle_brackets) - dir = pfile->bracket_include; - else if (type == IT_CMDLINE) - /* -include and -imacros use the #include "" chain with the - preprocessor's cwd prepended. */ - return make_cpp_dir (pfile, "./", false); - else if (pfile->quote_ignores_source_dir) - dir = pfile->quote_include; - else - return make_cpp_dir (pfile, dir_name_of_file (file), - pfile->buffer ? pfile->buffer->sysp : 0); - - if (dir == NULL) - cpp_error (pfile, CPP_DL_ERROR, - "no include path in which to search for %s", fname); - - return dir; -} - -/* Strip the basename from the file's path. It ends with a slash if - of nonzero length. Note that this procedure also works for - <stdin>, which is represented by the empty string. */ -static const char * -dir_name_of_file (_cpp_file *file) -{ - if (!file->dir_name) - { - size_t len = lbasename (file->path) - file->path; - char *dir_name = XNEWVEC (char, len + 1); - - memcpy (dir_name, file->path, len); - dir_name[len] = '\0'; - file->dir_name = dir_name; - } - - return file->dir_name; -} - -/* Handles #include-family directives (distinguished by TYPE), - including HEADER, and the command line -imacros and -include. - Returns true if a buffer was stacked. */ -bool -_cpp_stack_include (cpp_reader *pfile, const char *fname, int angle_brackets, - enum include_type type, location_t loc) -{ - /* For -include command-line flags we have type == IT_CMDLINE. - When the first -include file is processed we have the case, where - pfile->cur_token == pfile->cur_run->base, we are directly called up - by the front end. However in the case of the second -include file, - we are called from _cpp_lex_token -> _cpp_get_fresh_line -> - cpp_push_include, with pfile->cur_token != pfile->cur_run->base, - and pfile->cur_token[-1].src_loc not (yet) initialized. - However, when the include file cannot be found, we need src_loc to - be initialized to some safe value: 0 means UNKNOWN_LOCATION. */ - if (type == IT_CMDLINE && pfile->cur_token != pfile->cur_run->base) - pfile->cur_token[-1].src_loc = 0; - - cpp_dir *dir = search_path_head (pfile, fname, angle_brackets, type); - if (!dir) - return false; - - _cpp_file *file = _cpp_find_file (pfile, fname, dir, angle_brackets, - type == IT_DEFAULT ? _cpp_FFK_PRE_INCLUDE - : _cpp_FFK_NORMAL, loc); - if (type == IT_DEFAULT && file == NULL) - return false; - - return _cpp_stack_file (pfile, file, type, loc); -} - -/* NAME is a header file name, find the _cpp_file, if any. */ - -static _cpp_file * -test_header_unit (cpp_reader *pfile, const char *name, bool angle, - location_t loc) -{ - if (cpp_dir *dir = search_path_head (pfile, name, angle, IT_INCLUDE)) - return _cpp_find_file (pfile, name, dir, angle, _cpp_FFK_NORMAL, loc); - - return nullptr; -} - -/* NAME is a header file name, find the path we'll use to open it and infer that - it is a header-unit. */ - -const char * -_cpp_find_header_unit (cpp_reader *pfile, const char *name, bool angle, - location_t loc) -{ - if (_cpp_file *file = test_header_unit (pfile, name, angle, loc)) - { - if (file->fd > 0) - { - /* Don't leave it open. */ - close (file->fd); - file->fd = 0; - } - - file->header_unit = +1; - _cpp_mark_file_once_only (pfile, file); - - return file->path; - } - - return nullptr; -} - -/* NAME is a header file name, find the path we'll use to open it. But do not - infer it is a header unit. */ - -const char * -cpp_probe_header_unit (cpp_reader *pfile, const char *name, bool angle, - location_t loc) -{ - if (_cpp_file *file = test_header_unit (pfile, name, angle, loc)) - return file->path; - - return nullptr; -} - -/* Retrofit the just-entered main file asif it was an include. This - will permit correct include_next use, and mark it as a system - header if that's where it resides. We use filesystem-appropriate - prefix matching of the include path to locate the main file. */ -void -cpp_retrofit_as_include (cpp_reader *pfile) -{ - /* We should be the outermost. */ - gcc_assert (!pfile->buffer->prev); - - if (const char *name = pfile->main_file->name) - { - /* Locate name on the include dir path, using a prefix match. */ - size_t name_len = strlen (name); - for (cpp_dir *dir = pfile->quote_include; dir; dir = dir->next) - if (dir->len < name_len - && IS_DIR_SEPARATOR (name[dir->len]) - && !filename_ncmp (name, dir->name, dir->len)) - { - pfile->main_file->dir = dir; - if (dir->sysp) - cpp_make_system_header (pfile, 1, 0); - break; - } - } - - /* Initialize controlling macro state. */ - pfile->mi_valid = true; - pfile->mi_cmacro = 0; -} - -/* Could not open FILE. The complication is dependency output. */ -static void -open_file_failed (cpp_reader *pfile, _cpp_file *file, int angle_brackets, - location_t loc) -{ - int sysp = pfile->line_table->highest_line > 1 && pfile->buffer ? pfile->buffer->sysp : 0; - bool print_dep = CPP_OPTION (pfile, deps.style) > (angle_brackets || !!sysp); - - errno = file->err_no; - if (print_dep && CPP_OPTION (pfile, deps.missing_files) && errno == ENOENT) - { - deps_add_dep (pfile->deps, file->name); - /* If the preprocessor output (other than dependency information) is - being used, we must also flag an error. */ - if (CPP_OPTION (pfile, deps.need_preprocessor_output)) - cpp_errno_filename (pfile, CPP_DL_FATAL, - file->path ? file->path : file->name, - loc); - } - else - { - /* If we are not outputting dependencies, or if we are and dependencies - were requested for this file, or if preprocessor output is needed - in addition to dependency information, this is an error. - - Otherwise (outputting dependencies but not for this file, and not - using the preprocessor output), we can still produce correct output - so it's only a warning. */ - if (CPP_OPTION (pfile, deps.style) == DEPS_NONE - || print_dep - || CPP_OPTION (pfile, deps.need_preprocessor_output)) - cpp_errno_filename (pfile, CPP_DL_FATAL, - file->path ? file->path : file->name, - loc); - else - cpp_errno_filename (pfile, CPP_DL_WARNING, - file->path ? file->path : file->name, - loc); - } -} - -/* Search in the chain beginning at HEAD for a file whose search path - started at START_DIR != NULL. */ -static struct cpp_file_hash_entry * -search_cache (struct cpp_file_hash_entry *head, const cpp_dir *start_dir) -{ - while (head && head->start_dir != start_dir) - head = head->next; - - return head; -} - -/* Allocate a new _cpp_file structure. */ -static _cpp_file * -make_cpp_file (cpp_dir *dir, const char *fname) -{ - _cpp_file *file = XCNEW (_cpp_file); - file->fd = -1; - file->dir = dir; - file->name = xstrdup (fname); - - return file; -} - -/* Release a _cpp_file structure. */ -static void -destroy_cpp_file (_cpp_file *file) -{ - free ((void *) file->buffer_start); - free ((void *) file->name); - free ((void *) file->path); - free (file); -} - -/* Release all the files allocated by this reader. */ -static void -destroy_all_cpp_files (cpp_reader *pfile) -{ - _cpp_file *iter = pfile->all_files; - while (iter) - { - _cpp_file *next = iter->next_file; - destroy_cpp_file (iter); - iter = next; - } -} - -/* A hash of directory names. The directory names are the path names - of files which contain a #include "", the included file name is - appended to this directories. - - To avoid duplicate entries we follow the convention that all - non-empty directory names should end in a '/'. DIR_NAME must be - stored in permanently allocated memory. */ -static cpp_dir * -make_cpp_dir (cpp_reader *pfile, const char *dir_name, int sysp) -{ - struct cpp_file_hash_entry *entry, **hash_slot; - cpp_dir *dir; - - hash_slot = (struct cpp_file_hash_entry **) - htab_find_slot_with_hash (pfile->dir_hash, dir_name, - htab_hash_string (dir_name), - INSERT); - - /* Have we already hashed this directory? */ - for (entry = *hash_slot; entry; entry = entry->next) - if (entry->start_dir == NULL) - return entry->u.dir; - - dir = XCNEW (cpp_dir); - dir->next = pfile->quote_include; - dir->name = (char *) dir_name; - dir->len = strlen (dir_name); - dir->sysp = sysp; - dir->construct = 0; - - /* Store this new result in the hash table. */ - entry = new_file_hash_entry (pfile); - entry->next = *hash_slot; - entry->start_dir = NULL; - entry->location = pfile->line_table->highest_location; - entry->u.dir = dir; - *hash_slot = entry; - - return dir; -} - -/* Create a new block of memory for file hash entries. */ -static void -allocate_file_hash_entries (cpp_reader *pfile) -{ - struct file_hash_entry_pool *pool = XNEW (struct file_hash_entry_pool); - pool->file_hash_entries_used = 0; - pool->next = pfile->file_hash_entries; - pfile->file_hash_entries = pool; -} - -/* Return a new file hash entry. */ -static struct cpp_file_hash_entry * -new_file_hash_entry (cpp_reader *pfile) -{ - unsigned int idx; - if (pfile->file_hash_entries->file_hash_entries_used == FILE_HASH_POOL_SIZE) - allocate_file_hash_entries (pfile); - - idx = pfile->file_hash_entries->file_hash_entries_used++; - return &pfile->file_hash_entries->pool[idx]; -} - -/* Free the file hash entry pools. */ -static void -free_file_hash_entries (cpp_reader *pfile) -{ - struct file_hash_entry_pool *iter = pfile->file_hash_entries; - while (iter) - { - struct file_hash_entry_pool *next = iter->next; - free (iter); - iter = next; - } -} - -/* Returns TRUE if a file FNAME has ever been successfully opened. - This routine is not intended to correctly handle filenames aliased - by links or redundant . or .. traversals etc. */ -bool -cpp_included (cpp_reader *pfile, const char *fname) -{ - struct cpp_file_hash_entry *entry; - - entry = (struct cpp_file_hash_entry *) - htab_find_with_hash (pfile->file_hash, fname, htab_hash_string (fname)); - - while (entry && (entry->start_dir == NULL || entry->u.file->err_no)) - entry = entry->next; - - return entry != NULL; -} - -/* Returns TRUE if a file FNAME has ever been successfully opened - before LOCATION. This routine is not intended to correctly handle - filenames aliased by links or redundant . or .. traversals etc. */ -bool -cpp_included_before (cpp_reader *pfile, const char *fname, - location_t location) -{ - struct cpp_file_hash_entry *entry - = (struct cpp_file_hash_entry *) - htab_find_with_hash (pfile->file_hash, fname, htab_hash_string (fname)); - - if (IS_ADHOC_LOC (location)) - location = get_location_from_adhoc_loc (pfile->line_table, location); - - while (entry && (entry->start_dir == NULL || entry->u.file->err_no - || entry->location > location)) - entry = entry->next; - - return entry != NULL; -} - -/* Calculate the hash value of a file hash entry P. */ - -static hashval_t -file_hash_hash (const void *p) -{ - struct cpp_file_hash_entry *entry = (struct cpp_file_hash_entry *) p; - const char *hname; - if (entry->start_dir) - hname = entry->u.file->name; - else - hname = entry->u.dir->name; - - return htab_hash_string (hname); -} - -/* Compare a string Q against a file hash entry P. */ -static int -file_hash_eq (const void *p, const void *q) -{ - struct cpp_file_hash_entry *entry = (struct cpp_file_hash_entry *) p; - const char *fname = (const char *) q; - const char *hname; - - if (entry->start_dir) - hname = entry->u.file->name; - else - hname = entry->u.dir->name; - - return filename_cmp (hname, fname) == 0; -} - -/* Compare entries in the nonexistent file hash table. These are just - strings. */ -static int -nonexistent_file_hash_eq (const void *p, const void *q) -{ - return filename_cmp ((const char *) p, (const char *) q) == 0; -} - -/* Initialize everything in this source file. */ -void -_cpp_init_files (cpp_reader *pfile) -{ - pfile->file_hash = htab_create_alloc (127, file_hash_hash, file_hash_eq, - NULL, xcalloc, free); - pfile->dir_hash = htab_create_alloc (127, file_hash_hash, file_hash_eq, - NULL, xcalloc, free); - allocate_file_hash_entries (pfile); - pfile->nonexistent_file_hash = htab_create_alloc (127, htab_hash_string, - nonexistent_file_hash_eq, - NULL, xcalloc, free); - obstack_specify_allocation (&pfile->nonexistent_file_ob, 0, 0, - xmalloc, free); -} - -/* Finalize everything in this source file. */ -void -_cpp_cleanup_files (cpp_reader *pfile) -{ - htab_delete (pfile->file_hash); - htab_delete (pfile->dir_hash); - htab_delete (pfile->nonexistent_file_hash); - obstack_free (&pfile->nonexistent_file_ob, 0); - free_file_hash_entries (pfile); - destroy_all_cpp_files (pfile); -} - -/* Make the parser forget about files it has seen. This can be useful - for resetting the parser to start another run. */ -void -cpp_clear_file_cache (cpp_reader *pfile) -{ - _cpp_cleanup_files (pfile); - pfile->file_hash_entries = NULL; - pfile->all_files = NULL; - _cpp_init_files (pfile); -} - -/* Enter a file name in the hash for the sake of cpp_included. */ -void -_cpp_fake_include (cpp_reader *pfile, const char *fname) -{ - _cpp_find_file (pfile, fname, pfile->buffer->file->dir, 0, _cpp_FFK_FAKE, 0); -} - -/* Not everyone who wants to set system-header-ness on a buffer can - see the details of a buffer. This is an exported interface because - fix-header needs it. */ -void -cpp_make_system_header (cpp_reader *pfile, int syshdr, int externc) -{ - int flags = 0; - const class line_maps *line_table = pfile->line_table; - const line_map_ordinary *map = LINEMAPS_LAST_ORDINARY_MAP (line_table); - /* 1 = system header, 2 = system header to be treated as C. */ - if (syshdr) - flags = 1 + (externc != 0); - pfile->buffer->sysp = flags; - _cpp_do_file_change (pfile, LC_RENAME, ORDINARY_MAP_FILE_NAME (map), - SOURCE_LINE (map, pfile->line_table->highest_line), - flags); -} - -/* Allow the client to change the current file. Used by the front end - to achieve pseudo-file names like <built-in>. - If REASON is LC_LEAVE, then NEW_NAME must be NULL. */ -void -cpp_change_file (cpp_reader *pfile, enum lc_reason reason, - const char *new_name) -{ - _cpp_do_file_change (pfile, reason, new_name, 1, 0); -} - -struct report_missing_guard_data -{ - cpp_reader *pfile; - const char **paths; - size_t count; -}; - -/* Callback function for htab_traverse. */ -static int -report_missing_guard (void **slot, void *d) -{ - struct cpp_file_hash_entry *entry = (struct cpp_file_hash_entry *) *slot; - struct report_missing_guard_data *data - = (struct report_missing_guard_data *) d; - - /* Skip directories. */ - if (entry->start_dir != NULL) - { - _cpp_file *file = entry->u.file; - - /* We don't want MI guard advice for the main file. */ - if (!file->once_only - && file->cmacro == NULL - && file->stack_count == 1 - && data->pfile->main_file != file) - { - if (data->paths == NULL) - { - data->paths = XCNEWVEC (const char *, data->count); - data->count = 0; - } - - data->paths[data->count++] = file->path; - } - } - - /* Keep traversing the hash table. */ - return 1; -} - -/* Comparison function for qsort. */ -static int -report_missing_guard_cmp (const void *p1, const void *p2) -{ - return strcmp (*(const char *const *) p1, *(const char *const *) p2); -} - -/* Report on all files that might benefit from a multiple include guard. - Triggered by -H. */ -void -_cpp_report_missing_guards (cpp_reader *pfile) -{ - struct report_missing_guard_data data; - - data.pfile = pfile; - data.paths = NULL; - data.count = htab_elements (pfile->file_hash); - htab_traverse (pfile->file_hash, report_missing_guard, &data); - - if (data.paths != NULL) - { - size_t i; - - /* Sort the paths to avoid outputting them in hash table - order. */ - qsort (data.paths, data.count, sizeof (const char *), - report_missing_guard_cmp); - fputs (_("Multiple include guards may be useful for:\n"), - stderr); - for (i = 0; i < data.count; i++) - { - fputs (data.paths[i], stderr); - putc ('\n', stderr); - } - free (data.paths); - } -} - -/* Locate HEADER, and determine whether it is newer than the current - file. If it cannot be located or dated, return -1, if it is - newer, return 1, otherwise 0. */ -int -_cpp_compare_file_date (cpp_reader *pfile, const char *fname, - int angle_brackets) -{ - _cpp_file *file; - struct cpp_dir *dir; - - dir = search_path_head (pfile, fname, angle_brackets, IT_INCLUDE); - if (!dir) - return -1; - - file = _cpp_find_file (pfile, fname, dir, angle_brackets, _cpp_FFK_NORMAL, 0); - if (file->err_no) - return -1; - - if (file->fd != -1) - { - close (file->fd); - file->fd = -1; - } - - return file->st.st_mtime > pfile->buffer->file->st.st_mtime; -} - -/* Pushes the given file onto the buffer stack. Returns nonzero if - successful. */ -bool -cpp_push_include (cpp_reader *pfile, const char *fname) -{ - return _cpp_stack_include (pfile, fname, false, IT_CMDLINE, - pfile->line_table->highest_line); -} - -/* Pushes the given file, implicitly included at the start of a - compilation, onto the buffer stack but without any errors if the - file is not found. Returns nonzero if successful. */ -bool -cpp_push_default_include (cpp_reader *pfile, const char *fname) -{ - return _cpp_stack_include (pfile, fname, true, IT_DEFAULT, - pfile->line_table->highest_line); -} - -/* Do appropriate cleanup when a file INC's buffer is popped off the - input stack. */ -void -_cpp_pop_file_buffer (cpp_reader *pfile, _cpp_file *file, - const unsigned char *to_free) -{ - /* Record the inclusion-preventing macro, which could be NULL - meaning no controlling macro. */ - if (pfile->mi_valid && file->cmacro == NULL) - file->cmacro = pfile->mi_cmacro; - - /* Invalidate control macros in the #including file. */ - pfile->mi_valid = false; - - if (to_free) - { - if (to_free == file->buffer_start) - { - file->buffer_start = NULL; - file->buffer = NULL; - file->buffer_valid = false; - } - free ((void *) to_free); - } -} - -/* Return the file name associated with FILE. */ -const char * -_cpp_get_file_name (_cpp_file *file) -{ - return file->name; -} - -/* Inteface to file statistics record in _cpp_file structure. */ -struct stat * -_cpp_get_file_stat (_cpp_file *file) -{ - return &file->st; -} - -/* Set the include chain for "" to QUOTE, for <> to BRACKET. If - QUOTE_IGNORES_SOURCE_DIR, then "" includes do not look in the - directory of the including file. - - If BRACKET does not lie in the QUOTE chain, it is set to QUOTE. */ -void -cpp_set_include_chains (cpp_reader *pfile, cpp_dir *quote, cpp_dir *bracket, - int quote_ignores_source_dir) -{ - pfile->quote_include = quote; - pfile->bracket_include = quote; - pfile->quote_ignores_source_dir = quote_ignores_source_dir; - - for (; quote; quote = quote->next) - { - quote->name_map = NULL; - quote->len = strlen (quote->name); - if (quote == bracket) - pfile->bracket_include = bracket; - } -} - -/* Append the file name to the directory to create the path, but don't - turn / into // or // into ///; // may be a namespace escape. */ -static char * -append_file_to_dir (const char *fname, cpp_dir *dir) -{ - size_t dlen, flen; - char *path; - - dlen = dir->len; - flen = strlen (fname); - path = XNEWVEC (char, dlen + 1 + flen + 1); - memcpy (path, dir->name, dlen); - if (dlen && !IS_DIR_SEPARATOR (path[dlen - 1])) - path[dlen++] = '/'; - memcpy (&path[dlen], fname, flen + 1); - - return path; -} - -/* Read a space delimited string of unlimited length from a stdio - file F. */ -static char * -read_filename_string (int ch, FILE *f) -{ - char *alloc, *set; - int len; - - len = 20; - set = alloc = XNEWVEC (char, len + 1); - if (! is_space (ch)) - { - *set++ = ch; - while ((ch = getc (f)) != EOF && ! is_space (ch)) - { - if (set - alloc == len) - { - len *= 2; - alloc = XRESIZEVEC (char, alloc, len + 1); - set = alloc + len / 2; - } - *set++ = ch; - } - } - *set = '\0'; - ungetc (ch, f); - return alloc; -} - -/* Read the file name map file for DIR. */ -static void -read_name_map (cpp_dir *dir) -{ - static const char FILE_NAME_MAP_FILE[] = "header.gcc"; - char *name; - FILE *f; - size_t len, count = 0, room = 9; - - len = dir->len; - name = (char *) alloca (len + sizeof (FILE_NAME_MAP_FILE) + 1); - memcpy (name, dir->name, len); - if (len && !IS_DIR_SEPARATOR (name[len - 1])) - name[len++] = '/'; - strcpy (name + len, FILE_NAME_MAP_FILE); - f = fopen (name, "r"); - - dir->name_map = XNEWVEC (const char *, room); - - /* Silently return NULL if we cannot open. */ - if (f) - { - int ch; - - while ((ch = getc (f)) != EOF) - { - char *to; - - if (is_space (ch)) - continue; - - if (count + 2 > room) - { - room += 8; - dir->name_map = XRESIZEVEC (const char *, dir->name_map, room); - } - - dir->name_map[count] = read_filename_string (ch, f); - while ((ch = getc (f)) != EOF && is_hspace (ch)) - ; - - to = read_filename_string (ch, f); - if (IS_ABSOLUTE_PATH (to)) - dir->name_map[count + 1] = to; - else - { - dir->name_map[count + 1] = append_file_to_dir (to, dir); - free (to); - } - - count += 2; - while ((ch = getc (f)) != '\n') - if (ch == EOF) - break; - } - - fclose (f); - } - - /* Terminate the list of maps. */ - dir->name_map[count] = NULL; -} - -/* Remap a FILE's name based on the file_name_map, if any, for - FILE->dir. If the file name has any directory separators, - recursively check those directories too. */ -static char * -remap_filename (cpp_reader *pfile, _cpp_file *file) -{ - const char *fname, *p; - char *new_dir, *p3; - cpp_dir *dir; - size_t index, len; - - dir = file->dir; - fname = file->name; - - for (;;) - { - if (!dir->name_map) - read_name_map (dir); - - for (index = 0; dir->name_map[index]; index += 2) - if (!filename_cmp (dir->name_map[index], fname)) - return xstrdup (dir->name_map[index + 1]); - if (IS_ABSOLUTE_PATH (fname)) - return NULL; - p = strchr (fname, '/'); -#ifdef HAVE_DOS_BASED_FILE_SYSTEM - { - const char *p2 = strchr (fname, '\\'); - if (!p || (p > p2)) - p = p2; - } -#endif - if (!p || p == fname) - return NULL; - - len = dir->len + (p - fname + 1); - new_dir = XNEWVEC (char, len + 2); - p3 = new_dir + dir->len; - memcpy (new_dir, dir->name, dir->len); - if (dir->len && !IS_DIR_SEPARATOR (dir->name[dir->len - 1])) - { - *p3++ = '/'; - len++; - } - memcpy (p3, fname, p - fname + 1); - new_dir[len] = '\0'; - - dir = make_cpp_dir (pfile, new_dir, dir->sysp); - fname = p + 1; - } -} - -/* Returns true if PCHNAME is a valid PCH file for FILE. */ -static bool -validate_pch (cpp_reader *pfile, _cpp_file *file, const char *pchname) -{ - const char *saved_path = file->path; - bool valid = false; - - file->path = pchname; - if (open_file (file)) - { - valid = 1 & pfile->cb.valid_pch (pfile, pchname, file->fd); - - if (!valid) - { - close (file->fd); - file->fd = -1; - } - - if (CPP_OPTION (pfile, print_include_names)) - { - unsigned int i; - for (i = 1; i < pfile->line_table->depth; i++) - putc ('.', stderr); - fprintf (stderr, "%c %s\n", - valid ? '!' : 'x', pchname); - } - } - - file->path = saved_path; - return valid; -} - -/* Get the path associated with the _cpp_file F. The path includes - the base name from the include directive and the directory it was - found in via the search path. */ - -const char * -cpp_get_path (struct _cpp_file *f) -{ - return f->path; -} - -/* Get the directory associated with the _cpp_file F. */ - -cpp_dir * -cpp_get_dir (struct _cpp_file *f) -{ - return f->dir; -} - -/* Get the cpp_buffer currently associated with the cpp_reader - PFILE. */ - -cpp_buffer * -cpp_get_buffer (cpp_reader *pfile) -{ - return pfile->buffer; -} - -/* Get the _cpp_file associated with the cpp_buffer B. */ - -_cpp_file * -cpp_get_file (cpp_buffer *b) -{ - return b->file; -} - -/* Get the previous cpp_buffer given a cpp_buffer B. The previous - buffer is the buffer that included the given buffer. */ - -cpp_buffer * -cpp_get_prev (cpp_buffer *b) -{ - return b->prev; -} - -/* This data structure holds the list of header files that were seen - while the PCH was being built. The 'entries' field is kept sorted - in memcmp() order; yes, this means that on little-endian systems, - it's sorted initially by the least-significant byte of 'size', but - that's OK. The code does rely on having entries with the same size - next to each other. */ - -struct pchf_entry { - /* The size of this file. This is used to save running a MD5 checksum - if the sizes don't match. */ - off_t size; - /* The MD5 checksum of this file. */ - unsigned char sum[16]; - /* Is this file to be included only once? */ - bool once_only; -}; - -struct pchf_data { - /* Number of pchf_entry structures. */ - size_t count; - - /* Are there any values with once_only set? - This is used as an optimisation, it means we don't have to search - the structure if we're processing a regular #include. */ - bool have_once_only; - - struct pchf_entry entries[1]; -}; - -static struct pchf_data *pchf; - -/* A qsort ordering function for pchf_entry structures. */ - -static int -pchf_save_compare (const void *e1, const void *e2) -{ - return memcmp (e1, e2, sizeof (struct pchf_entry)); -} - -/* Create and write to F a pchf_data structure. */ - -bool -_cpp_save_file_entries (cpp_reader *pfile, FILE *fp) -{ - size_t count = 0; - struct pchf_data *result; - size_t result_size; - _cpp_file *f; - bool ret; - - for (f = pfile->all_files; f; f = f->next_file) - ++count; - - result_size = (sizeof (struct pchf_data) - + sizeof (struct pchf_entry) * (count - 1)); - result = XCNEWVAR (struct pchf_data, result_size); - - result->count = 0; - result->have_once_only = false; - - for (f = pfile->all_files; f; f = f->next_file) - { - size_t count; - - /* This should probably never happen, since if a read error occurred - the PCH file shouldn't be written... */ - if (f->dont_read || f->err_no) - continue; - - if (f->stack_count == 0) - continue; - - count = result->count++; - - result->entries[count].once_only = f->once_only; - /* |= is avoided in the next line because of an HP C compiler bug */ - result->have_once_only = result->have_once_only | f->once_only; - if (f->buffer_valid) - md5_buffer ((const char *)f->buffer, - f->st.st_size, result->entries[count].sum); - else - { - FILE *ff; - int oldfd = f->fd; - - if (!open_file (f)) - { - open_file_failed (pfile, f, 0, 0); - free (result); - return false; - } - ff = fdopen (f->fd, "rb"); - md5_stream (ff, result->entries[count].sum); - fclose (ff); - f->fd = oldfd; - } - result->entries[count].size = f->st.st_size; - } - - result_size = (sizeof (struct pchf_data) - + sizeof (struct pchf_entry) * (result->count - 1)); - - qsort (result->entries, result->count, sizeof (struct pchf_entry), - pchf_save_compare); - - ret = fwrite (result, result_size, 1, fp) == 1; - free (result); - return ret; -} - -/* Read the pchf_data structure from F. */ - -bool -_cpp_read_file_entries (cpp_reader *pfile ATTRIBUTE_UNUSED, FILE *f) -{ - struct pchf_data d; - - if (fread (&d, sizeof (struct pchf_data) - sizeof (struct pchf_entry), 1, f) - != 1) - return false; - - pchf = XNEWVAR (struct pchf_data, sizeof (struct pchf_data) - + sizeof (struct pchf_entry) * (d.count - 1)); - memcpy (pchf, &d, sizeof (struct pchf_data) - sizeof (struct pchf_entry)); - if (fread (pchf->entries, sizeof (struct pchf_entry), d.count, f) - != d.count) - return false; - return true; -} - -/* The parameters for pchf_compare. */ - -struct pchf_compare_data -{ - /* The size of the file we're looking for. */ - off_t size; - - /* The MD5 checksum of the file, if it's been computed. */ - unsigned char sum[16]; - - /* Is SUM valid? */ - bool sum_computed; - - /* Do we need to worry about entries that don't have ONCE_ONLY set? */ - bool check_included; - - /* The file that we're searching for. */ - _cpp_file *f; -}; - -/* bsearch comparison function; look for D_P in E_P. */ - -static int -pchf_compare (const void *d_p, const void *e_p) -{ - const struct pchf_entry *e = (const struct pchf_entry *)e_p; - struct pchf_compare_data *d = (struct pchf_compare_data *)d_p; - int result; - - result = memcmp (&d->size, &e->size, sizeof (off_t)); - if (result != 0) - return result; - - if (! d->sum_computed) - { - _cpp_file *const f = d->f; - - md5_buffer ((const char *)f->buffer, f->st.st_size, d->sum); - d->sum_computed = true; - } - - result = memcmp (d->sum, e->sum, 16); - if (result != 0) - return result; - - if (d->check_included || e->once_only) - return 0; - else - return 1; -} - -/* Check that F is not in a list read from a PCH file (if any). - Assumes that f->buffer_valid is true. Return TRUE if the file - should not be read. */ - -static bool -check_file_against_entries (cpp_reader *pfile ATTRIBUTE_UNUSED, - _cpp_file *f, - bool check_included) -{ - struct pchf_compare_data d; - - if (pchf == NULL - || (! check_included && ! pchf->have_once_only)) - return false; - - d.size = f->st.st_size; - d.sum_computed = false; - d.f = f; - d.check_included = check_included; - return bsearch (&d, pchf->entries, pchf->count, sizeof (struct pchf_entry), - pchf_compare) != NULL; -} - -/* Return true if the file FNAME is found in the appropriate include file path - as indicated by ANGLE_BRACKETS. */ - -bool -_cpp_has_header (cpp_reader *pfile, const char *fname, int angle_brackets, - enum include_type type) -{ - cpp_dir *start_dir = search_path_head (pfile, fname, angle_brackets, type); - _cpp_file *file = _cpp_find_file (pfile, fname, start_dir, angle_brackets, - _cpp_FFK_HAS_INCLUDE, 0); - return file->err_no != ENOENT; -} - -/* Read a file and convert to input charset, the same as if it were being read - by a cpp_reader. */ - -cpp_converted_source -cpp_get_converted_source (const char *fname, const char *input_charset) -{ - cpp_converted_source res = {}; - _cpp_file file = {}; - file.fd = -1; - file.name = lbasename (fname); - file.path = fname; - if (!open_file (&file)) - return res; - const bool ok = read_file_guts (NULL, &file, 0, input_charset); - close (file.fd); - if (!ok) - return res; - res.to_free = (char *) file.buffer_start; - res.data = (char *) file.buffer; - res.len = file.st.st_size; - return res; -} |