* cache.c: Reorganize file to avoid forward reference.
This commit is contained in:
Alan Modra
parent
2ca673f687
commit
d0fdd288c7
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@ -1,3 +1,7 @@
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2005-10-27 Alan Modra <amodra@bigpond.net.au>
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* cache.c: Reorganize file to avoid forward reference.
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2005-10-26 Alan Modra <amodra@bigpond.net.au>
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* cache.c (bfd_cache_lookup_worker): Don't abort on failing to
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379
bfd/cache.c
379
bfd/cache.c
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@ -45,8 +45,195 @@ SUBSECTION
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#include "libbfd.h"
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#include "libiberty.h"
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static bfd_boolean bfd_cache_delete (bfd *);
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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 = NULL;
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/* Insert a BFD into the cache. */
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static void
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insert (bfd *abfd)
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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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static void
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snip (bfd *abfd)
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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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/* Close a BFD and remove it from the cache. */
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static bfd_boolean
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bfd_cache_delete (bfd *abfd)
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{
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bfd_boolean ret;
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if (fclose ((FILE *) abfd->iostream) == 0)
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ret = TRUE;
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else
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{
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ret = FALSE;
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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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/* 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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static bfd_boolean
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close_one (void)
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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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return TRUE;
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}
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kill->where = real_ftell ((FILE *) kill->iostream);
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return bfd_cache_delete (kill);
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}
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/*
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INTERNAL_FUNCTION
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bfd_cache_lookup
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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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.#define bfd_cache_lookup(x) \
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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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*/
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/*
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INTERNAL_FUNCTION
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bfd_cache_lookup_worker
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SYNOPSIS
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FILE *bfd_cache_lookup_worker (bfd *abfd);
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DESCRIPTION
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Called when the macro <<bfd_cache_lookup>> fails to find a
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quick answer. Find a file descriptor for @var{abfd}. If
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necessary, it open it. If there are already more than
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<<BFD_CACHE_MAX_OPEN>> files open, it tries to close one first, to
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avoid running out of file descriptors. It will return NULL
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if it is unable to (re)open the @var{abfd}.
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*/
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FILE *
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bfd_cache_lookup_worker (bfd *abfd)
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{
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bfd *orig_bfd = abfd;
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if ((abfd->flags & BFD_IN_MEMORY) != 0)
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abort ();
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if (abfd->my_archive)
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abfd = abfd->my_archive;
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if (abfd->iostream != NULL)
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{
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/* Move the file to the start of the cache. */
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if (abfd != bfd_last_cache)
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{
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snip (abfd);
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insert (abfd);
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}
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return (FILE *) abfd->iostream;
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}
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if (bfd_open_file (abfd) == NULL)
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;
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else if (real_fseek ((FILE *) abfd->iostream, abfd->where, SEEK_SET) != 0)
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bfd_set_error (bfd_error_system_call);
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else
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return (FILE *) abfd->iostream;
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(*_bfd_error_handler) (_("reopening %B: %s\n"),
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orig_bfd, bfd_errmsg (bfd_get_error ()));
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return NULL;
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}
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static file_ptr
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cache_btell (struct bfd *abfd)
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@ -173,147 +360,6 @@ static const struct bfd_iovec cache_iovec = {
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&cache_bclose, &cache_bflush, &cache_bstat
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};
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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 = NULL;
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/*
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INTERNAL_FUNCTION
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bfd_cache_lookup
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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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.#define bfd_cache_lookup(x) \
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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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*/
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/* Insert a BFD into the cache. */
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static void
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insert (bfd *abfd)
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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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static void
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snip (bfd *abfd)
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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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static bfd_boolean
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close_one (void)
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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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return TRUE;
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}
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kill->where = real_ftell ((FILE *) kill->iostream);
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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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static bfd_boolean
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bfd_cache_delete (bfd *abfd)
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{
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bfd_boolean ret;
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if (fclose ((FILE *) abfd->iostream) == 0)
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ret = TRUE;
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else
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{
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ret = FALSE;
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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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@ -480,52 +526,3 @@ bfd_open_file (bfd *abfd)
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return (FILE *) abfd->iostream;
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}
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/*
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INTERNAL_FUNCTION
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bfd_cache_lookup_worker
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SYNOPSIS
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FILE *bfd_cache_lookup_worker (bfd *abfd);
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DESCRIPTION
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Called when the macro <<bfd_cache_lookup>> fails to find a
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quick answer. Find a file descriptor for @var{abfd}. If
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necessary, it open it. If there are already more than
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<<BFD_CACHE_MAX_OPEN>> files open, it tries to close one first, to
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avoid running out of file descriptors. It will return NULL
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if it is unable to (re)open the @var{abfd}.
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*/
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FILE *
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bfd_cache_lookup_worker (bfd *abfd)
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{
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bfd *orig_bfd = abfd;
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if ((abfd->flags & BFD_IN_MEMORY) != 0)
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abort ();
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if (abfd->my_archive)
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abfd = abfd->my_archive;
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if (abfd->iostream != NULL)
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{
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/* Move the file to the start of the cache. */
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if (abfd != bfd_last_cache)
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{
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snip (abfd);
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insert (abfd);
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}
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return (FILE *) abfd->iostream;
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}
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if (bfd_open_file (abfd) == NULL)
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;
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else if (real_fseek ((FILE *) abfd->iostream, abfd->where, SEEK_SET) != 0)
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bfd_set_error (bfd_error_system_call);
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else
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return (FILE *) abfd->iostream;
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(*_bfd_error_handler) (_("reopening %B: %s\n"),
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orig_bfd, bfd_errmsg (bfd_get_error ()));
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return NULL;
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}
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