1999-05-03 09:29:11 +02:00
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/* BFD library -- caching of file descriptors.
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2004-02-12 00:23:20 +01:00
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Copyright 1990, 1991, 1992, 1993, 1994, 1996, 2000, 2001, 2002,
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2003, 2004 Free Software Foundation, Inc.
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1999-05-03 09:29:11 +02:00
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Hacked by Steve Chamberlain of Cygnus Support (steve@cygnus.com).
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This file is part of BFD, the Binary File Descriptor library.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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2005-05-04 09:19:45 +02:00
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02110-1301, USA. */
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1999-05-03 09:29:11 +02:00
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/*
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SECTION
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File caching
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The file caching mechanism is embedded within BFD and allows
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the application to open as many BFDs as it wants without
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regard to the underlying operating system's file descriptor
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limit (often as low as 20 open files). The module in
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<<cache.c>> maintains a least recently used list of
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<<BFD_CACHE_MAX_OPEN>> files, and exports the name
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<<bfd_cache_lookup>>, which runs around and makes sure that
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the required BFD is open. If not, then it chooses a file to
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close, closes it and opens the one wanted, returning its file
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2000-11-28 22:42:16 +01:00
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handle.
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1999-05-03 09:29:11 +02:00
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*/
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#include "bfd.h"
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#include "sysdep.h"
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#include "libbfd.h"
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2005-03-02 10:03:58 +01:00
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#include "libiberty.h"
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1999-05-03 09:29:11 +02:00
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2003-06-29 12:06:40 +02:00
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static bfd_boolean bfd_cache_delete (bfd *);
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1999-05-03 09:29:11 +02:00
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2004-04-21 Andrew Cagney <cagney@redhat.com>
* opncls.c (_bfd_new_bfd_contained_in): Copy "iovec".
(struct opncls, opncls_btell, opncls_bseek, opncls_bread)
(opncls_bwrite, opncls_bclose, opncls_bflush)
(opncls_bstat, opncls_iovec, bfd_openr_iovec): Implement a
bfd iovec that uses function callbacks.
(bfd_close): Use the iovec's bclose.
* cache.c (cache_btell, cache_bseek, cache_bread, cache_bwrite)
(cache_bclose, cache_bflush, cache_bstat)
(cache_iovec): New functions and global variable, implement a
cache "iovec", where applicable set bfd_error.
(bfd_cache_init, bfd_cache_close): Set/test the bfd's iovec.
* bfdio.c (struct bfd_iovec): Define.
(real_read): Delete function.
(bfd_bread, bfd_bread, bfd_bwrite, bfd_tell, bfd_flush, bfd_stat)
(bfd_seek, bfd_get_mtime, bfd_get_size): Use the bfd's "iovec",
assume that bread and bwrite set bfd_error.
* bfd.c (struct bfd): Add "iovec", update comments.
* bfd-in2.h, libbfd.h: Re-generate.
2004-04-21 19:05:12 +02:00
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static file_ptr
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cache_btell (struct bfd *abfd)
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{
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return real_ftell (bfd_cache_lookup (abfd));
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}
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static int
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cache_bseek (struct bfd *abfd, file_ptr offset, int whence)
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{
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return real_fseek (bfd_cache_lookup (abfd), offset, whence);
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}
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/* Note that archive entries don't have streams; they share their parent's.
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This allows someone to play with the iostream behind BFD's back.
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Also, note that the origin pointer points to the beginning of a file's
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contents (0 for non-archive elements). For archive entries this is the
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first octet in the file, NOT the beginning of the archive header. */
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static file_ptr
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cache_bread (struct bfd *abfd, void *buf, file_ptr nbytes)
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{
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file_ptr nread;
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/* FIXME - this looks like an optimization, but it's really to cover
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up for a feature of some OSs (not solaris - sigh) that
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ld/pe-dll.c takes advantage of (apparently) when it creates BFDs
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internally and tries to link against them. BFD seems to be smart
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enough to realize there are no symbol records in the "file" that
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doesn't exist but attempts to read them anyway. On Solaris,
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attempting to read zero bytes from a NULL file results in a core
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dump, but on other platforms it just returns zero bytes read.
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This makes it to something reasonable. - DJ */
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if (nbytes == 0)
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return 0;
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#if defined (__VAX) && defined (VMS)
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/* Apparently fread on Vax VMS does not keep the record length
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information. */
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nread = read (fileno (bfd_cache_lookup (abfd)), buf, nbytes);
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/* Set bfd_error if we did not read as much data as we expected. If
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the read failed due to an error set the bfd_error_system_call,
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else set bfd_error_file_truncated. */
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if (nread == (file_ptr)-1)
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{
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bfd_set_error (bfd_error_system_call);
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return -1;
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}
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#else
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nread = fread (buf, 1, nbytes, bfd_cache_lookup (abfd));
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/* Set bfd_error if we did not read as much data as we expected. If
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the read failed due to an error set the bfd_error_system_call,
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else set bfd_error_file_truncated. */
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if (nread < nbytes && ferror (bfd_cache_lookup (abfd)))
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{
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bfd_set_error (bfd_error_system_call);
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return -1;
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}
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#endif
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return nread;
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}
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static file_ptr
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cache_bwrite (struct bfd *abfd, const void *where, file_ptr nbytes)
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{
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file_ptr nwrite = fwrite (where, 1, nbytes, bfd_cache_lookup (abfd));
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if (nwrite < nbytes && ferror (bfd_cache_lookup (abfd)))
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{
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bfd_set_error (bfd_error_system_call);
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return -1;
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}
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return nwrite;
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}
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static int
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cache_bclose (struct bfd *abfd)
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{
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return bfd_cache_close (abfd);
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}
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static int
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cache_bflush (struct bfd *abfd)
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{
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int sts = fflush (bfd_cache_lookup (abfd));
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if (sts < 0)
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bfd_set_error (bfd_error_system_call);
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return sts;
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}
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static int
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cache_bstat (struct bfd *abfd, struct stat *sb)
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{
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int sts = fstat (fileno (bfd_cache_lookup (abfd)), sb);
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if (sts < 0)
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bfd_set_error (bfd_error_system_call);
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return sts;
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}
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static const struct bfd_iovec cache_iovec = {
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&cache_bread, &cache_bwrite, &cache_btell, &cache_bseek,
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&cache_bclose, &cache_bflush, &cache_bstat
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};
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1999-05-03 09:29:11 +02:00
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/*
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INTERNAL_FUNCTION
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BFD_CACHE_MAX_OPEN macro
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DESCRIPTION
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The maximum number of files which the cache will keep open at
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one time.
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.#define BFD_CACHE_MAX_OPEN 10
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*/
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/* The number of BFD files we have open. */
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static int open_files;
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/*
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INTERNAL_FUNCTION
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bfd_last_cache
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SYNOPSIS
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extern bfd *bfd_last_cache;
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DESCRIPTION
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Zero, or a pointer to the topmost BFD on the chain. This is
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used by the <<bfd_cache_lookup>> macro in @file{libbfd.h} to
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determine when it can avoid a function call.
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*/
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bfd *bfd_last_cache;
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/*
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INTERNAL_FUNCTION
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bfd_cache_lookup
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2000-11-28 22:42:16 +01:00
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1999-05-03 09:29:11 +02:00
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DESCRIPTION
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Check to see if the required BFD is the same as the last one
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looked up. If so, then it can use the stream in the BFD with
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impunity, since it can't have changed since the last lookup;
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otherwise, it has to perform the complicated lookup function.
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2000-11-28 22:42:16 +01:00
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1999-05-03 09:29:11 +02:00
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.#define bfd_cache_lookup(x) \
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2004-05-05 17:39:11 +02:00
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. ((x) == bfd_last_cache ? \
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. (FILE *) (bfd_last_cache->iostream): \
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. bfd_cache_lookup_worker (x))
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2000-11-28 22:42:16 +01:00
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1999-05-03 09:29:11 +02:00
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*/
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/* Insert a BFD into the cache. */
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2003-06-29 12:06:40 +02:00
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static void
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insert (bfd *abfd)
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1999-05-03 09:29:11 +02:00
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{
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if (bfd_last_cache == NULL)
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{
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abfd->lru_next = abfd;
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abfd->lru_prev = abfd;
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}
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else
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{
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abfd->lru_next = bfd_last_cache;
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abfd->lru_prev = bfd_last_cache->lru_prev;
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abfd->lru_prev->lru_next = abfd;
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abfd->lru_next->lru_prev = abfd;
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}
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bfd_last_cache = abfd;
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}
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/* Remove a BFD from the cache. */
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2003-06-29 12:06:40 +02:00
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static void
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snip (bfd *abfd)
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1999-05-03 09:29:11 +02:00
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{
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abfd->lru_prev->lru_next = abfd->lru_next;
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abfd->lru_next->lru_prev = abfd->lru_prev;
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if (abfd == bfd_last_cache)
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{
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bfd_last_cache = abfd->lru_next;
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if (abfd == bfd_last_cache)
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bfd_last_cache = NULL;
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}
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}
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/* We need to open a new file, and the cache is full. Find the least
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recently used cacheable BFD and close it. */
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2002-11-30 09:39:46 +01:00
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static bfd_boolean
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2003-06-29 12:06:40 +02:00
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close_one (void)
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1999-05-03 09:29:11 +02:00
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{
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register bfd *kill;
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if (bfd_last_cache == NULL)
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kill = NULL;
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else
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{
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for (kill = bfd_last_cache->lru_prev;
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! kill->cacheable;
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kill = kill->lru_prev)
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{
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if (kill == bfd_last_cache)
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{
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kill = NULL;
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break;
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}
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}
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}
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if (kill == NULL)
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{
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/* There are no open cacheable BFD's. */
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2002-11-30 09:39:46 +01:00
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return TRUE;
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1999-05-03 09:29:11 +02:00
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}
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2004-02-12 00:23:20 +01:00
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kill->where = real_ftell ((FILE *) kill->iostream);
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1999-05-03 09:29:11 +02:00
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return bfd_cache_delete (kill);
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}
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/* Close a BFD and remove it from the cache. */
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2002-11-30 09:39:46 +01:00
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static bfd_boolean
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2003-06-29 12:06:40 +02:00
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bfd_cache_delete (bfd *abfd)
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1999-05-03 09:29:11 +02:00
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{
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2002-11-30 09:39:46 +01:00
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bfd_boolean ret;
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1999-05-03 09:29:11 +02:00
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if (fclose ((FILE *) abfd->iostream) == 0)
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2002-11-30 09:39:46 +01:00
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ret = TRUE;
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1999-05-03 09:29:11 +02:00
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else
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{
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2002-11-30 09:39:46 +01:00
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ret = FALSE;
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1999-05-03 09:29:11 +02:00
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bfd_set_error (bfd_error_system_call);
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}
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snip (abfd);
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abfd->iostream = NULL;
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--open_files;
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return ret;
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}
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/*
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INTERNAL_FUNCTION
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bfd_cache_init
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SYNOPSIS
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2002-11-30 09:39:46 +01:00
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bfd_boolean bfd_cache_init (bfd *abfd);
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1999-05-03 09:29:11 +02:00
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DESCRIPTION
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Add a newly opened BFD to the cache.
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*/
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2002-11-30 09:39:46 +01:00
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bfd_boolean
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2003-06-29 12:06:40 +02:00
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bfd_cache_init (bfd *abfd)
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1999-05-03 09:29:11 +02:00
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{
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BFD_ASSERT (abfd->iostream != NULL);
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if (open_files >= BFD_CACHE_MAX_OPEN)
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{
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if (! close_one ())
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2002-11-30 09:39:46 +01:00
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return FALSE;
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1999-05-03 09:29:11 +02:00
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}
|
2004-04-21 Andrew Cagney <cagney@redhat.com>
* opncls.c (_bfd_new_bfd_contained_in): Copy "iovec".
(struct opncls, opncls_btell, opncls_bseek, opncls_bread)
(opncls_bwrite, opncls_bclose, opncls_bflush)
(opncls_bstat, opncls_iovec, bfd_openr_iovec): Implement a
bfd iovec that uses function callbacks.
(bfd_close): Use the iovec's bclose.
* cache.c (cache_btell, cache_bseek, cache_bread, cache_bwrite)
(cache_bclose, cache_bflush, cache_bstat)
(cache_iovec): New functions and global variable, implement a
cache "iovec", where applicable set bfd_error.
(bfd_cache_init, bfd_cache_close): Set/test the bfd's iovec.
* bfdio.c (struct bfd_iovec): Define.
(real_read): Delete function.
(bfd_bread, bfd_bread, bfd_bwrite, bfd_tell, bfd_flush, bfd_stat)
(bfd_seek, bfd_get_mtime, bfd_get_size): Use the bfd's "iovec",
assume that bread and bwrite set bfd_error.
* bfd.c (struct bfd): Add "iovec", update comments.
* bfd-in2.h, libbfd.h: Re-generate.
2004-04-21 19:05:12 +02:00
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abfd->iovec = &cache_iovec;
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1999-05-03 09:29:11 +02:00
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insert (abfd);
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++open_files;
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2002-11-30 09:39:46 +01:00
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return TRUE;
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1999-05-03 09:29:11 +02:00
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|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
INTERNAL_FUNCTION
|
|
|
|
bfd_cache_close
|
|
|
|
|
|
|
|
SYNOPSIS
|
2002-11-30 09:39:46 +01:00
|
|
|
bfd_boolean bfd_cache_close (bfd *abfd);
|
1999-05-03 09:29:11 +02:00
|
|
|
|
|
|
|
DESCRIPTION
|
|
|
|
Remove the BFD @var{abfd} from the cache. If the attached file is open,
|
|
|
|
then close it too.
|
|
|
|
|
|
|
|
RETURNS
|
2002-11-30 09:39:46 +01:00
|
|
|
<<FALSE>> is returned if closing the file fails, <<TRUE>> is
|
1999-05-03 09:29:11 +02:00
|
|
|
returned if all is well.
|
|
|
|
*/
|
|
|
|
|
2002-11-30 09:39:46 +01:00
|
|
|
bfd_boolean
|
2003-06-29 12:06:40 +02:00
|
|
|
bfd_cache_close (bfd *abfd)
|
1999-05-03 09:29:11 +02:00
|
|
|
{
|
2004-04-21 Andrew Cagney <cagney@redhat.com>
* opncls.c (_bfd_new_bfd_contained_in): Copy "iovec".
(struct opncls, opncls_btell, opncls_bseek, opncls_bread)
(opncls_bwrite, opncls_bclose, opncls_bflush)
(opncls_bstat, opncls_iovec, bfd_openr_iovec): Implement a
bfd iovec that uses function callbacks.
(bfd_close): Use the iovec's bclose.
* cache.c (cache_btell, cache_bseek, cache_bread, cache_bwrite)
(cache_bclose, cache_bflush, cache_bstat)
(cache_iovec): New functions and global variable, implement a
cache "iovec", where applicable set bfd_error.
(bfd_cache_init, bfd_cache_close): Set/test the bfd's iovec.
* bfdio.c (struct bfd_iovec): Define.
(real_read): Delete function.
(bfd_bread, bfd_bread, bfd_bwrite, bfd_tell, bfd_flush, bfd_stat)
(bfd_seek, bfd_get_mtime, bfd_get_size): Use the bfd's "iovec",
assume that bread and bwrite set bfd_error.
* bfd.c (struct bfd): Add "iovec", update comments.
* bfd-in2.h, libbfd.h: Re-generate.
2004-04-21 19:05:12 +02:00
|
|
|
if (abfd->iovec != &cache_iovec)
|
2002-11-30 09:39:46 +01:00
|
|
|
return TRUE;
|
1999-05-03 09:29:11 +02:00
|
|
|
|
2004-04-22 18:17:31 +02:00
|
|
|
if (abfd->iostream == NULL)
|
|
|
|
/* Previously closed. */
|
|
|
|
return TRUE;
|
|
|
|
|
1999-05-03 09:29:11 +02:00
|
|
|
return bfd_cache_delete (abfd);
|
|
|
|
}
|
|
|
|
|
2004-06-17 13:47:51 +02:00
|
|
|
/*
|
|
|
|
FUNCTION
|
|
|
|
bfd_cache_close_all
|
|
|
|
|
|
|
|
SYNOPSIS
|
|
|
|
bfd_boolean bfd_cache_close_all (void);
|
|
|
|
|
|
|
|
DESCRIPTION
|
|
|
|
Remove all BFDs from the cache. If the attached file is open,
|
|
|
|
then close it too.
|
|
|
|
|
|
|
|
RETURNS
|
|
|
|
<<FALSE>> is returned if closing one of the file fails, <<TRUE>> is
|
|
|
|
returned if all is well.
|
|
|
|
*/
|
|
|
|
|
|
|
|
bfd_boolean
|
|
|
|
bfd_cache_close_all ()
|
|
|
|
{
|
|
|
|
bfd_boolean ret = TRUE;
|
|
|
|
|
|
|
|
while (bfd_last_cache != NULL)
|
|
|
|
ret &= bfd_cache_close (bfd_last_cache);
|
2004-06-17 13:55:02 +02:00
|
|
|
|
|
|
|
return ret;
|
2004-06-17 13:47:51 +02:00
|
|
|
}
|
|
|
|
|
1999-05-03 09:29:11 +02:00
|
|
|
/*
|
|
|
|
INTERNAL_FUNCTION
|
|
|
|
bfd_open_file
|
|
|
|
|
|
|
|
SYNOPSIS
|
2003-06-29 12:06:40 +02:00
|
|
|
FILE* bfd_open_file (bfd *abfd);
|
1999-05-03 09:29:11 +02:00
|
|
|
|
|
|
|
DESCRIPTION
|
|
|
|
Call the OS to open a file for @var{abfd}. Return the <<FILE *>>
|
|
|
|
(possibly <<NULL>>) that results from this operation. Set up the
|
|
|
|
BFD so that future accesses know the file is open. If the <<FILE *>>
|
|
|
|
returned is <<NULL>>, then it won't have been put in the
|
|
|
|
cache, so it won't have to be removed from it.
|
|
|
|
*/
|
|
|
|
|
|
|
|
FILE *
|
2003-06-29 12:06:40 +02:00
|
|
|
bfd_open_file (bfd *abfd)
|
1999-05-03 09:29:11 +02:00
|
|
|
{
|
2002-11-30 09:39:46 +01:00
|
|
|
abfd->cacheable = TRUE; /* Allow it to be closed later. */
|
1999-05-03 09:29:11 +02:00
|
|
|
|
|
|
|
if (open_files >= BFD_CACHE_MAX_OPEN)
|
|
|
|
{
|
|
|
|
if (! close_one ())
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
switch (abfd->direction)
|
|
|
|
{
|
|
|
|
case read_direction:
|
|
|
|
case no_direction:
|
|
|
|
abfd->iostream = (PTR) fopen (abfd->filename, FOPEN_RB);
|
|
|
|
break;
|
|
|
|
case both_direction:
|
|
|
|
case write_direction:
|
2002-06-25 08:21:54 +02:00
|
|
|
if (abfd->opened_once)
|
1999-05-03 09:29:11 +02:00
|
|
|
{
|
|
|
|
abfd->iostream = (PTR) fopen (abfd->filename, FOPEN_RUB);
|
|
|
|
if (abfd->iostream == NULL)
|
|
|
|
abfd->iostream = (PTR) fopen (abfd->filename, FOPEN_WUB);
|
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
2000-04-03 21:19:11 +02:00
|
|
|
/* Create the file.
|
|
|
|
|
|
|
|
Some operating systems won't let us overwrite a running
|
|
|
|
binary. For them, we want to unlink the file first.
|
|
|
|
|
|
|
|
However, gcc 2.95 will create temporary files using
|
|
|
|
O_EXCL and tight permissions to prevent other users from
|
|
|
|
substituting other .o files during the compilation. gcc
|
|
|
|
will then tell the assembler to use the newly created
|
|
|
|
file as an output file. If we unlink the file here, we
|
|
|
|
open a brief window when another user could still
|
|
|
|
substitute a file.
|
|
|
|
|
|
|
|
So we unlink the output file if and only if it has
|
|
|
|
non-zero size. */
|
2000-05-26 15:11:57 +02:00
|
|
|
#ifndef __MSDOS__
|
|
|
|
/* Don't do this for MSDOS: it doesn't care about overwriting
|
|
|
|
a running binary, but if this file is already open by
|
|
|
|
another BFD, we will be in deep trouble if we delete an
|
|
|
|
open file. In fact, objdump does just that if invoked with
|
|
|
|
the --info option. */
|
2000-04-03 21:19:11 +02:00
|
|
|
struct stat s;
|
|
|
|
|
|
|
|
if (stat (abfd->filename, &s) == 0 && s.st_size != 0)
|
2005-03-02 10:03:58 +01:00
|
|
|
unlink_if_ordinary (abfd->filename);
|
2000-05-26 15:11:57 +02:00
|
|
|
#endif
|
2001-01-14 08:03:49 +01:00
|
|
|
abfd->iostream = (PTR) fopen (abfd->filename, FOPEN_WUB);
|
2002-11-30 09:39:46 +01:00
|
|
|
abfd->opened_once = TRUE;
|
1999-05-03 09:29:11 +02:00
|
|
|
}
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (abfd->iostream != NULL)
|
|
|
|
{
|
|
|
|
if (! bfd_cache_init (abfd))
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
return (FILE *) abfd->iostream;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
INTERNAL_FUNCTION
|
|
|
|
bfd_cache_lookup_worker
|
|
|
|
|
|
|
|
SYNOPSIS
|
2003-06-29 12:06:40 +02:00
|
|
|
FILE *bfd_cache_lookup_worker (bfd *abfd);
|
1999-05-03 09:29:11 +02:00
|
|
|
|
|
|
|
DESCRIPTION
|
|
|
|
Called when the macro <<bfd_cache_lookup>> fails to find a
|
|
|
|
quick answer. Find a file descriptor for @var{abfd}. If
|
|
|
|
necessary, it open it. If there are already more than
|
|
|
|
<<BFD_CACHE_MAX_OPEN>> files open, it tries to close one first, to
|
2004-05-05 17:39:11 +02:00
|
|
|
avoid running out of file descriptors. It will abort rather than
|
|
|
|
returning NULL if it is unable to (re)open the @var{abfd}.
|
1999-05-03 09:29:11 +02:00
|
|
|
*/
|
|
|
|
|
|
|
|
FILE *
|
2003-06-29 12:06:40 +02:00
|
|
|
bfd_cache_lookup_worker (bfd *abfd)
|
1999-05-03 09:29:11 +02:00
|
|
|
{
|
|
|
|
if ((abfd->flags & BFD_IN_MEMORY) != 0)
|
|
|
|
abort ();
|
|
|
|
|
2000-11-28 22:42:16 +01:00
|
|
|
if (abfd->my_archive)
|
1999-05-03 09:29:11 +02:00
|
|
|
abfd = abfd->my_archive;
|
|
|
|
|
|
|
|
if (abfd->iostream != NULL)
|
|
|
|
{
|
|
|
|
/* Move the file to the start of the cache. */
|
|
|
|
if (abfd != bfd_last_cache)
|
|
|
|
{
|
|
|
|
snip (abfd);
|
|
|
|
insert (abfd);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
2004-05-05 17:39:11 +02:00
|
|
|
if (bfd_open_file (abfd) == NULL
|
|
|
|
|| abfd->where != (unsigned long) abfd->where
|
|
|
|
|| real_fseek ((FILE *) abfd->iostream, abfd->where, SEEK_SET) != 0)
|
|
|
|
abort ();
|
1999-05-03 09:29:11 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
return (FILE *) abfd->iostream;
|
|
|
|
}
|