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-rw-r--r--bfd/cache.c350
1 files changed, 0 insertions, 350 deletions
diff --git a/bfd/cache.c b/bfd/cache.c
deleted file mode 100644
index b28de4bc4b9..00000000000
--- a/bfd/cache.c
+++ /dev/null
@@ -1,350 +0,0 @@
-/* BFD library -- caching of file descriptors.
- Copyright 1990, 91, 92, 93, 94, 95, 1996 Free Software Foundation, Inc.
- Hacked by Steve Chamberlain of Cygnus Support (steve@cygnus.com).
-
-This file is part of BFD, the Binary File Descriptor library.
-
-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 of the License, 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, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
-
-/*
-SECTION
- File caching
-
- The file caching mechanism is embedded within BFD and allows
- the application to open as many BFDs as it wants without
- regard to the underlying operating system's file descriptor
- limit (often as low as 20 open files). The module in
- <<cache.c>> maintains a least recently used list of
- <<BFD_CACHE_MAX_OPEN>> files, and exports the name
- <<bfd_cache_lookup>>, which runs around and makes sure that
- the required BFD is open. If not, then it chooses a file to
- close, closes it and opens the one wanted, returning its file
- handle.
-
-*/
-
-#include "bfd.h"
-#include "sysdep.h"
-#include "libbfd.h"
-
-static void insert PARAMS ((bfd *));
-static void snip PARAMS ((bfd *));
-static boolean close_one PARAMS ((void));
-static boolean bfd_cache_delete PARAMS ((bfd *));
-
-/*
-INTERNAL_FUNCTION
- BFD_CACHE_MAX_OPEN macro
-
-DESCRIPTION
- The maximum number of files which the cache will keep open at
- one time.
-
-.#define BFD_CACHE_MAX_OPEN 10
-
-*/
-
-/* The number of BFD files we have open. */
-
-static int open_files;
-
-/*
-INTERNAL_FUNCTION
- bfd_last_cache
-
-SYNOPSIS
- extern bfd *bfd_last_cache;
-
-DESCRIPTION
- Zero, or a pointer to the topmost BFD on the chain. This is
- used by the <<bfd_cache_lookup>> macro in @file{libbfd.h} to
- determine when it can avoid a function call.
-*/
-
-bfd *bfd_last_cache;
-
-/*
- INTERNAL_FUNCTION
- bfd_cache_lookup
-
- DESCRIPTION
- Check to see if the required BFD is the same as the last one
- looked up. If so, then it can use the stream in the BFD with
- impunity, since it can't have changed since the last lookup;
- otherwise, it has to perform the complicated lookup function.
-
- .#define bfd_cache_lookup(x) \
- . ((x)==bfd_last_cache? \
- . (FILE*)(bfd_last_cache->iostream): \
- . bfd_cache_lookup_worker(x))
-
-
- */
-
-/* Insert a BFD into the cache. */
-
-static INLINE void
-insert (abfd)
- bfd *abfd;
-{
- if (bfd_last_cache == NULL)
- {
- abfd->lru_next = abfd;
- abfd->lru_prev = abfd;
- }
- else
- {
- abfd->lru_next = bfd_last_cache;
- abfd->lru_prev = bfd_last_cache->lru_prev;
- abfd->lru_prev->lru_next = abfd;
- abfd->lru_next->lru_prev = abfd;
- }
- bfd_last_cache = abfd;
-}
-
-/* Remove a BFD from the cache. */
-
-static INLINE void
-snip (abfd)
- bfd *abfd;
-{
- abfd->lru_prev->lru_next = abfd->lru_next;
- abfd->lru_next->lru_prev = abfd->lru_prev;
- if (abfd == bfd_last_cache)
- {
- bfd_last_cache = abfd->lru_next;
- if (abfd == bfd_last_cache)
- bfd_last_cache = NULL;
- }
-}
-
-/* We need to open a new file, and the cache is full. Find the least
- recently used cacheable BFD and close it. */
-
-static boolean
-close_one ()
-{
- register bfd *kill;
-
- if (bfd_last_cache == NULL)
- kill = NULL;
- else
- {
- for (kill = bfd_last_cache->lru_prev;
- ! kill->cacheable;
- kill = kill->lru_prev)
- {
- if (kill == bfd_last_cache)
- {
- kill = NULL;
- break;
- }
- }
- }
-
- if (kill == NULL)
- {
- /* There are no open cacheable BFD's. */
- return true;
- }
-
- kill->where = ftell ((FILE *) kill->iostream);
-
- return bfd_cache_delete (kill);
-}
-
-/* Close a BFD and remove it from the cache. */
-
-static boolean
-bfd_cache_delete (abfd)
- bfd *abfd;
-{
- boolean ret;
-
- if (fclose ((FILE *) abfd->iostream) == 0)
- ret = true;
- else
- {
- ret = false;
- bfd_set_error (bfd_error_system_call);
- }
-
- snip (abfd);
-
- abfd->iostream = NULL;
- --open_files;
-
- return ret;
-}
-
-/*
-INTERNAL_FUNCTION
- bfd_cache_init
-
-SYNOPSIS
- boolean bfd_cache_init (bfd *abfd);
-
-DESCRIPTION
- Add a newly opened BFD to the cache.
-*/
-
-boolean
-bfd_cache_init (abfd)
- bfd *abfd;
-{
- BFD_ASSERT (abfd->iostream != NULL);
- if (open_files >= BFD_CACHE_MAX_OPEN)
- {
- if (! close_one ())
- return false;
- }
- insert (abfd);
- ++open_files;
- return true;
-}
-
-/*
-INTERNAL_FUNCTION
- bfd_cache_close
-
-SYNOPSIS
- boolean bfd_cache_close (bfd *abfd);
-
-DESCRIPTION
- Remove the BFD @var{abfd} from the cache. If the attached file is open,
- then close it too.
-
-RETURNS
- <<false>> is returned if closing the file fails, <<true>> is
- returned if all is well.
-*/
-
-boolean
-bfd_cache_close (abfd)
- bfd *abfd;
-{
- if (abfd->iostream == NULL
- || (abfd->flags & BFD_IN_MEMORY) != 0)
- return true;
-
- return bfd_cache_delete (abfd);
-}
-
-/*
-INTERNAL_FUNCTION
- bfd_open_file
-
-SYNOPSIS
- FILE* bfd_open_file(bfd *abfd);
-
-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 *
-bfd_open_file (abfd)
- bfd *abfd;
-{
- abfd->cacheable = true; /* Allow it to be closed later. */
-
- 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:
- if (abfd->opened_once == true)
- {
- abfd->iostream = (PTR) fopen (abfd->filename, FOPEN_RUB);
- if (abfd->iostream == NULL)
- abfd->iostream = (PTR) fopen (abfd->filename, FOPEN_WUB);
- }
- else
- {
- /* Create the file. Unlink it first, for the convenience of
- operating systems which worry about overwriting running
- binaries. */
- unlink (abfd->filename);
- abfd->iostream = (PTR) fopen (abfd->filename, FOPEN_WB);
- abfd->opened_once = true;
- }
- break;
- }
-
- if (abfd->iostream != NULL)
- {
- if (! bfd_cache_init (abfd))
- return NULL;
- }
-
- return (FILE *) abfd->iostream;
-}
-
-/*
-INTERNAL_FUNCTION
- bfd_cache_lookup_worker
-
-SYNOPSIS
- FILE *bfd_cache_lookup_worker(bfd *abfd);
-
-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
- avoid running out of file descriptors.
-*/
-
-FILE *
-bfd_cache_lookup_worker (abfd)
- bfd *abfd;
-{
- if ((abfd->flags & BFD_IN_MEMORY) != 0)
- abort ();
-
- if (abfd->my_archive)
- 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
- {
- if (bfd_open_file (abfd) == NULL)
- return NULL;
- if (fseek ((FILE *) abfd->iostream, abfd->where, SEEK_SET) != 0)
- return NULL;
- }
-
- return (FILE *) abfd->iostream;
-}
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