a83dfa7651
undefined behavior. The code used this macro to avoid problems on some broken systems which define SSIZE_MAX incorrectly, but this is not needed on FreeBSD, obviously. MFC after: 3 days
1689 lines
46 KiB
C
1689 lines
46 KiB
C
/* Part of CPP library. File handling.
|
||
Copyright (C) 1986, 1987, 1989, 1992, 1993, 1994, 1995, 1998,
|
||
1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
|
||
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 2, 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; if not, write to the Free Software
|
||
Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
|
||
|
||
#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
|
||
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;
|
||
|
||
/* 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;
|
||
|
||
/* If read() failed before. */
|
||
bool dont_read;
|
||
|
||
/* If this file is the main file. */
|
||
bool main_file;
|
||
|
||
/* If BUFFER above contains the true contents of the file. */
|
||
bool buffer_valid;
|
||
|
||
/* File is a PCH (on return from find_include_file). */
|
||
bool pch;
|
||
};
|
||
|
||
/* 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 file_hash_entry
|
||
{
|
||
struct file_hash_entry *next;
|
||
cpp_dir *start_dir;
|
||
union
|
||
{
|
||
_cpp_file *file;
|
||
cpp_dir *dir;
|
||
} u;
|
||
};
|
||
|
||
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);
|
||
static bool read_file_guts (cpp_reader *pfile, _cpp_file *file);
|
||
static bool read_file (cpp_reader *pfile, _cpp_file *file);
|
||
static bool should_stack_file (cpp_reader *, _cpp_file *file, bool import);
|
||
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);
|
||
static struct file_hash_entry *search_cache (struct file_hash_entry *head,
|
||
const cpp_dir *start_dir);
|
||
static _cpp_file *make_cpp_file (cpp_reader *, 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 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;
|
||
}
|
||
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;
|
||
|
||
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)
|
||
file->pch = true;
|
||
else
|
||
*invalid_pch = true;
|
||
}
|
||
|
||
if (valid)
|
||
file->pchname = pchname;
|
||
else
|
||
free (pchname);
|
||
|
||
return valid;
|
||
}
|
||
|
||
/* 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. */
|
||
|
||
static bool
|
||
find_file_in_dir (cpp_reader *pfile, _cpp_file *file, bool *invalid_pch)
|
||
{
|
||
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 = htab_hash_string (path);
|
||
char *copy;
|
||
void **pp;
|
||
|
||
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);
|
||
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 = 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 tue 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().
|
||
*/
|
||
_cpp_file *
|
||
_cpp_find_file (cpp_reader *pfile, const char *fname, cpp_dir *start_dir, bool fake, int angle_brackets)
|
||
{
|
||
struct file_hash_entry *entry, **hash_slot;
|
||
_cpp_file *file;
|
||
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 (pfile, CPP_DL_ICE, "NULL directory in find_file");
|
||
|
||
hash_slot = (struct file_hash_entry **)
|
||
htab_find_slot_with_hash (pfile->file_hash, fname,
|
||
htab_hash_string (fname),
|
||
INSERT);
|
||
|
||
/* First check the cache before we resort to memory allocation. */
|
||
entry = search_cache (*hash_slot, start_dir);
|
||
if (entry)
|
||
return entry->u.file;
|
||
|
||
file = make_cpp_file (pfile, start_dir, fname);
|
||
|
||
/* Try each path in the include chain. */
|
||
for (; !fake ;)
|
||
{
|
||
if (find_file_in_dir (pfile, file, &invalid_pch))
|
||
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;
|
||
return file;
|
||
}
|
||
|
||
open_file_failed (pfile, file, angle_brackets);
|
||
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_ERROR,
|
||
"use -Winvalid-pch for more information");
|
||
}
|
||
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 (*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 = *hash_slot;
|
||
entry->start_dir = start_dir;
|
||
entry->u.file = file;
|
||
*hash_slot = 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 = *hash_slot;
|
||
entry->start_dir = pfile->bracket_include;
|
||
entry->u.file = file;
|
||
*hash_slot = entry;
|
||
}
|
||
if (saw_quote_include
|
||
&& pfile->quote_include != start_dir
|
||
&& found_in_cache != pfile->quote_include)
|
||
{
|
||
entry = new_file_hash_entry (pfile);
|
||
entry->next = *hash_slot;
|
||
entry->start_dir = pfile->quote_include;
|
||
entry->u.file = file;
|
||
*hash_slot = 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.
|
||
|
||
FIXME: Flush file cache and try again if we run out of memory. */
|
||
static bool
|
||
read_file_guts (cpp_reader *pfile, _cpp_file *file)
|
||
{
|
||
ssize_t size, total, count;
|
||
off_t offset;
|
||
uchar *buf;
|
||
bool regular;
|
||
|
||
if (S_ISBLK (file->st.st_mode))
|
||
{
|
||
cpp_error (pfile, CPP_DL_ERROR, "%s is a block device", file->path);
|
||
return false;
|
||
}
|
||
|
||
regular = S_ISREG (file->st.st_mode);
|
||
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 > SSIZE_MAX)
|
||
{
|
||
cpp_error (pfile, CPP_DL_ERROR, "%s is too large", file->path);
|
||
return false;
|
||
}
|
||
|
||
size = file->st.st_size;
|
||
|
||
if ((offset = lseek(file->fd, 0, SEEK_CUR)) < 0)
|
||
{
|
||
cpp_error (pfile, CPP_DL_ERROR, "%s has no current position",
|
||
file->path);
|
||
return false;
|
||
}
|
||
else if (offset > SSIZE_MAX || (ssize_t)offset > size)
|
||
{
|
||
cpp_error (pfile, CPP_DL_ERROR, "current position of %s is too large",
|
||
file->path);
|
||
return false;
|
||
}
|
||
|
||
size -= (ssize_t)offset;
|
||
}
|
||
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;
|
||
|
||
buf = XNEWVEC (uchar, size + 1);
|
||
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 + 1);
|
||
}
|
||
}
|
||
|
||
if (count < 0)
|
||
{
|
||
cpp_errno (pfile, CPP_DL_ERROR, file->path);
|
||
return false;
|
||
}
|
||
|
||
if (regular && total != size && STAT_SIZE_RELIABLE (file->st))
|
||
cpp_error (pfile, CPP_DL_WARNING,
|
||
"%s is shorter than expected", file->path);
|
||
|
||
file->buffer = _cpp_convert_input (pfile, CPP_OPTION (pfile, input_charset),
|
||
buf, size, total, &file->st.st_size);
|
||
file->buffer_valid = true;
|
||
|
||
return true;
|
||
}
|
||
|
||
/* 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. */
|
||
static bool
|
||
read_file (cpp_reader *pfile, _cpp_file *file)
|
||
{
|
||
/* 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);
|
||
return false;
|
||
}
|
||
|
||
file->dont_read = !read_file_guts (pfile, file);
|
||
close (file->fd);
|
||
file->fd = -1;
|
||
|
||
return !file->dont_read;
|
||
}
|
||
|
||
/* Returns TRUE if FILE's contents have been successfully placed in
|
||
FILE->buffer and the file should be stacked, otherwise false. */
|
||
static bool
|
||
should_stack_file (cpp_reader *pfile, _cpp_file *file, bool import)
|
||
{
|
||
_cpp_file *f;
|
||
|
||
/* Skip once-only files. */
|
||
if (file->once_only)
|
||
return false;
|
||
|
||
/* 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 false;
|
||
}
|
||
|
||
/* 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 && file->cmacro->type == NT_MACRO)
|
||
return false;
|
||
|
||
/* Handle PCH files immediately; don't stack them. */
|
||
if (file->pch)
|
||
{
|
||
pfile->cb.read_pch (pfile, file->pchname, file->fd, file->path);
|
||
close (file->fd);
|
||
file->fd = -1;
|
||
return false;
|
||
}
|
||
|
||
if (!read_file (pfile, file))
|
||
return false;
|
||
|
||
/* 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 (f = pfile->all_files; f; f = f->next_file)
|
||
{
|
||
if (f == file)
|
||
continue;
|
||
|
||
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;
|
||
bool same_file_p = false;
|
||
|
||
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 (pfile, f->dir, f->name);
|
||
ref_file->path = f->path;
|
||
}
|
||
else
|
||
/* The file is not stacked anymore. We can reuse it. */
|
||
ref_file = f;
|
||
|
||
same_file_p = read_file (pfile, ref_file)
|
||
/* 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)
|
||
break;
|
||
}
|
||
}
|
||
|
||
return f == NULL;
|
||
}
|
||
|
||
/* Place the file referenced by FILE into a new buffer on the buffer
|
||
stack if possible. IMPORT is true if this stacking attempt is
|
||
because of a #import directive. Returns true if a buffer is
|
||
stacked. */
|
||
bool
|
||
_cpp_stack_file (cpp_reader *pfile, _cpp_file *file, bool import)
|
||
{
|
||
cpp_buffer *buffer;
|
||
int sysp;
|
||
|
||
if (!should_stack_file (pfile, file, import))
|
||
return false;
|
||
|
||
if (pfile->buffer == NULL || file->dir == NULL)
|
||
sysp = 0;
|
||
else
|
||
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 && !file->stack_count)
|
||
{
|
||
if (!file->main_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. */
|
||
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;
|
||
|
||
/* Initialize controlling macro state. */
|
||
pfile->mi_valid = true;
|
||
pfile->mi_cmacro = 0;
|
||
|
||
/* Generate the call back. */
|
||
_cpp_do_file_change (pfile, LC_ENTER, file->path, 1, sysp);
|
||
|
||
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)
|
||
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)
|
||
{
|
||
struct cpp_dir *dir;
|
||
_cpp_file *file;
|
||
|
||
dir = search_path_head (pfile, fname, angle_brackets, type);
|
||
if (!dir)
|
||
return false;
|
||
|
||
file = _cpp_find_file (pfile, fname, dir, false, angle_brackets);
|
||
|
||
/* Compensate for the increment in linemap_add. In the case of a
|
||
normal #include, we're currently at the start of the line
|
||
*following* the #include. A separate source_location for this
|
||
location makes no sense (until we do the LC_LEAVE), and
|
||
complicates LAST_SOURCE_LINE_LOCATION. This does not apply if we
|
||
found a PCH file (in which case linemap_add is not called) or we
|
||
were included from the command-line. */
|
||
if (! file->pch && file->err_no == 0 && type != IT_CMDLINE)
|
||
pfile->line_table->highest_location--;
|
||
|
||
return _cpp_stack_file (pfile, file, type == IT_IMPORT);
|
||
}
|
||
|
||
/* Could not open FILE. The complication is dependency output. */
|
||
static void
|
||
open_file_failed (cpp_reader *pfile, _cpp_file *file, int angle_brackets)
|
||
{
|
||
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);
|
||
else
|
||
{
|
||
/* If we are outputting dependencies but not for this file then
|
||
don't error because we can still produce correct output. */
|
||
if (CPP_OPTION (pfile, deps.style) && ! print_dep)
|
||
cpp_errno (pfile, CPP_DL_WARNING, file->path);
|
||
else
|
||
cpp_errno (pfile, CPP_DL_ERROR, file->path);
|
||
}
|
||
}
|
||
|
||
/* Search in the chain beginning at HEAD for a file whose search path
|
||
started at START_DIR != NULL. */
|
||
static struct file_hash_entry *
|
||
search_cache (struct 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_reader *pfile, cpp_dir *dir, const char *fname)
|
||
{
|
||
_cpp_file *file;
|
||
|
||
file = XCNEW (_cpp_file);
|
||
file->main_file = !pfile->buffer;
|
||
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)
|
||
{
|
||
if (file->buffer)
|
||
free ((void *) file->buffer);
|
||
free ((void *) file->name);
|
||
free (file);
|
||
}
|
||
|
||
/* 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 file_hash_entry *entry, **hash_slot;
|
||
cpp_dir *dir;
|
||
|
||
hash_slot = (struct 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->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)
|
||
{
|
||
pfile->file_hash_entries_used = 0;
|
||
pfile->file_hash_entries_allocated = 127;
|
||
pfile->file_hash_entries = XNEWVEC (struct file_hash_entry,
|
||
pfile->file_hash_entries_allocated);
|
||
}
|
||
|
||
/* Return a new file hash entry. */
|
||
static struct file_hash_entry *
|
||
new_file_hash_entry (cpp_reader *pfile)
|
||
{
|
||
if (pfile->file_hash_entries_used == pfile->file_hash_entries_allocated)
|
||
allocate_file_hash_entries (pfile);
|
||
|
||
return &pfile->file_hash_entries[pfile->file_hash_entries_used++];
|
||
}
|
||
|
||
/* 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 file_hash_entry *entry;
|
||
|
||
entry = (struct 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;
|
||
}
|
||
|
||
/* Calculate the hash value of a file hash entry P. */
|
||
|
||
static hashval_t
|
||
file_hash_hash (const void *p)
|
||
{
|
||
struct file_hash_entry *entry = (struct 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 file_hash_entry *entry = (struct 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 strcmp (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 strcmp (p, 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_begin (&pfile->nonexistent_file_ob, 0, 0,
|
||
(void *(*) (long)) xmalloc,
|
||
(void (*) (void *)) 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);
|
||
}
|
||
|
||
/* 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, true, 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 struct line_maps *line_table = pfile->line_table;
|
||
const struct line_map *map = &line_table->maps[line_table->used-1];
|
||
|
||
/* 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, map->to_file,
|
||
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);
|
||
}
|
||
|
||
/* Callback function for htab_traverse. */
|
||
static int
|
||
report_missing_guard (void **slot, void *b)
|
||
{
|
||
struct file_hash_entry *entry = (struct file_hash_entry *) *slot;
|
||
int *bannerp = (int *) b;
|
||
|
||
/* 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->cmacro == NULL && file->stack_count == 1 && !file->main_file)
|
||
{
|
||
if (*bannerp == 0)
|
||
{
|
||
fputs (_("Multiple include guards may be useful for:\n"),
|
||
stderr);
|
||
*bannerp = 1;
|
||
}
|
||
|
||
fputs (entry->u.file->path, stderr);
|
||
putc ('\n', stderr);
|
||
}
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
/* Report on all files that might benefit from a multiple include guard.
|
||
Triggered by -H. */
|
||
void
|
||
_cpp_report_missing_guards (cpp_reader *pfile)
|
||
{
|
||
int banner = 0;
|
||
|
||
htab_traverse (pfile->file_hash, report_missing_guard, &banner);
|
||
}
|
||
|
||
/* 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, false, angle_brackets);
|
||
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);
|
||
}
|
||
|
||
/* 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)
|
||
{
|
||
/* 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 (file->buffer)
|
||
{
|
||
free ((void *) file->buffer);
|
||
file->buffer = NULL;
|
||
file->buffer_valid = false;
|
||
}
|
||
}
|
||
|
||
/* 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 && 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 && 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;
|
||
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 (!strcmp (dir->name_map[index], fname))
|
||
return xstrdup (dir->name_map[index + 1]);
|
||
|
||
p = strchr (fname, '/');
|
||
if (!p || p == fname)
|
||
return NULL;
|
||
|
||
len = dir->len + (p - fname + 1);
|
||
new_dir = XNEWVEC (char, len + 1);
|
||
memcpy (new_dir, dir->name, dir->len);
|
||
memcpy (new_dir + dir->len, 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;
|
||
|
||
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);
|
||
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);
|
||
|
||
return fwrite (result, result_size, 1, fp) == 1;
|
||
}
|
||
|
||
/* 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;
|
||
}
|