/* Definitions for BFD wrappers used by GDB.
- Copyright (C) 2011, 2012
- Free Software Foundation, Inc.
+ Copyright (C) 2011-2013 Free Software Foundation, Inc.
This file is part of GDB.
#include "gdb_bfd.h"
#include "gdb_assert.h"
#include "gdb_string.h"
+#include "ui-out.h"
+#include "gdbcmd.h"
#include "hashtab.h"
+#ifdef HAVE_ZLIB_H
+#include <zlib.h>
+#endif
+#ifdef HAVE_MMAP
+#include <sys/mman.h>
+#ifndef MAP_FAILED
+#define MAP_FAILED ((void *) -1)
+#endif
+#endif
+
+/* An object of this type is stored in the section's user data when
+ mapping a section. */
+
+struct gdb_bfd_section_data
+{
+ /* Size of the data. */
+ bfd_size_type size;
+ /* If the data was mmapped, this is the length of the map. */
+ bfd_size_type map_len;
+ /* The data. If NULL, the section data has not been read. */
+ void *data;
+ /* If the data was mmapped, this is the map address. */
+ void *map_addr;
+};
+
+/* A hash table holding every BFD that gdb knows about. This is not
+ to be confused with 'gdb_bfd_cache', which is used for sharing
+ BFDs; in contrast, this hash is used just to implement
+ "maint info bfd". */
+
+static htab_t all_bfds;
/* See gdb_bfd.h. */
/* The mtime of the BFD at the point the cache entry was made. */
time_t mtime;
+
+ /* If the BFD comes from an archive, this points to the archive's
+ BFD. Otherwise, this is NULL. */
+ bfd *archive_bfd;
+
+ /* The registry. */
+ REGISTRY_FIELDS;
};
+#define GDB_BFD_DATA_ACCESSOR(ABFD) \
+ ((struct gdb_bfd_data *) bfd_usrdata (ABFD))
+
+DEFINE_REGISTRY (bfd, GDB_BFD_DATA_ACCESSOR)
+
/* A hash table storing all the BFDs maintained in the cache. */
static htab_t gdb_bfd_cache;
if (abfd != NULL)
{
close (fd);
- return gdb_bfd_ref (abfd);
+ gdb_bfd_ref (abfd);
+ return abfd;
}
abfd = bfd_fopen (name, target, FOPEN_RB, fd);
*slot = abfd;
gdb_bfd_stash_filename (abfd);
- return gdb_bfd_ref (abfd);
+ gdb_bfd_ref (abfd);
+ return abfd;
+}
+
+/* A helper function that releases any section data attached to the
+ BFD. */
+
+static void
+free_one_bfd_section (bfd *abfd, asection *sectp, void *ignore)
+{
+ struct gdb_bfd_section_data *sect = bfd_get_section_userdata (abfd, sectp);
+
+ if (sect != NULL && sect->data != NULL)
+ {
+#ifdef HAVE_MMAP
+ if (sect->map_addr != NULL)
+ {
+ int res;
+
+ res = munmap (sect->map_addr, sect->map_len);
+ gdb_assert (res == 0);
+ }
+ else
+#endif
+ xfree (sect->data);
+ }
}
/* Close ABFD, and warn if that fails. */
int ret;
char *name = bfd_get_filename (abfd);
+ bfd_map_over_sections (abfd, free_one_bfd_section, NULL);
+
ret = bfd_close (abfd);
if (!ret)
return ret;
}
-/* Add reference to ABFD. Returns ABFD. */
+/* See gdb_bfd.h. */
-struct bfd *
+void
gdb_bfd_ref (struct bfd *abfd)
{
struct gdb_bfd_data *gdata;
+ void **slot;
if (abfd == NULL)
- return NULL;
+ return;
gdata = bfd_usrdata (abfd);
if (gdata != NULL)
{
gdata->refc += 1;
- return abfd;
+ return;
}
+ /* Ask BFD to decompress sections in bfd_get_full_section_contents. */
+ abfd->flags |= BFD_DECOMPRESS;
+
gdata = bfd_zalloc (abfd, sizeof (struct gdb_bfd_data));
gdata->refc = 1;
gdata->mtime = bfd_get_mtime (abfd);
+ gdata->archive_bfd = NULL;
bfd_usrdata (abfd) = gdata;
- return abfd;
+ bfd_alloc_data (abfd);
+
+ /* This is the first we've seen it, so add it to the hash table. */
+ slot = htab_find_slot (all_bfds, abfd, INSERT);
+ gdb_assert (slot && !*slot);
+ *slot = abfd;
}
-/* Unreference and possibly close ABFD. */
+/* See gdb_bfd.h. */
void
gdb_bfd_unref (struct bfd *abfd)
{
struct gdb_bfd_data *gdata;
struct gdb_bfd_cache_search search;
+ bfd *archive_bfd;
if (abfd == NULL)
return;
if (gdata->refc > 0)
return;
+ archive_bfd = gdata->archive_bfd;
search.filename = bfd_get_filename (abfd);
if (gdb_bfd_cache && search.filename)
htab_clear_slot (gdb_bfd_cache, slot);
}
+ bfd_free_data (abfd);
bfd_usrdata (abfd) = NULL; /* Paranoia. */
+ htab_remove_elt (all_bfds, abfd);
+
gdb_bfd_close_or_warn (abfd);
+
+ gdb_bfd_unref (archive_bfd);
+}
+
+/* A helper function that returns the section data descriptor
+ associated with SECTION. If no such descriptor exists, a new one
+ is allocated and cleared. */
+
+static struct gdb_bfd_section_data *
+get_section_descriptor (asection *section)
+{
+ struct gdb_bfd_section_data *result;
+
+ result = bfd_get_section_userdata (section->owner, section);
+
+ if (result == NULL)
+ {
+ result = bfd_zalloc (section->owner, sizeof (*result));
+ bfd_set_section_userdata (section->owner, section, result);
+ }
+
+ return result;
+}
+
+/* See gdb_bfd.h. */
+
+const gdb_byte *
+gdb_bfd_map_section (asection *sectp, bfd_size_type *size)
+{
+ bfd *abfd;
+ struct gdb_bfd_section_data *descriptor;
+ bfd_byte *data;
+
+ gdb_assert ((sectp->flags & SEC_RELOC) == 0);
+ gdb_assert (size != NULL);
+
+ abfd = sectp->owner;
+
+ descriptor = get_section_descriptor (sectp);
+
+ /* If the data was already read for this BFD, just reuse it. */
+ if (descriptor->data != NULL)
+ goto done;
+
+#ifdef HAVE_MMAP
+ if (!bfd_is_section_compressed (abfd, sectp))
+ {
+ /* The page size, used when mmapping. */
+ static int pagesize;
+
+ if (pagesize == 0)
+ pagesize = getpagesize ();
+
+ /* Only try to mmap sections which are large enough: we don't want
+ to waste space due to fragmentation. */
+
+ if (bfd_get_section_size (sectp) > 4 * pagesize)
+ {
+ descriptor->size = bfd_get_section_size (sectp);
+ descriptor->data = bfd_mmap (abfd, 0, descriptor->size, PROT_READ,
+ MAP_PRIVATE, sectp->filepos,
+ &descriptor->map_addr,
+ &descriptor->map_len);
+
+ if ((caddr_t)descriptor->data != MAP_FAILED)
+ {
+#if HAVE_POSIX_MADVISE
+ posix_madvise (descriptor->map_addr, descriptor->map_len,
+ POSIX_MADV_WILLNEED);
+#endif
+ goto done;
+ }
+
+ /* On failure, clear out the section data and try again. */
+ memset (descriptor, 0, sizeof (*descriptor));
+ }
+ }
+#endif /* HAVE_MMAP */
+
+ /* Handle compressed sections, or ordinary uncompressed sections in
+ the no-mmap case. */
+
+ descriptor->size = bfd_get_section_size (sectp);
+ descriptor->data = NULL;
+
+ data = NULL;
+ if (!bfd_get_full_section_contents (abfd, sectp, &data))
+ error (_("Can't read data for section '%s' in file '%s'"),
+ bfd_get_section_name (abfd, sectp),
+ bfd_get_filename (abfd));
+ descriptor->data = data;
+
+ done:
+ gdb_assert (descriptor->data != NULL);
+ *size = descriptor->size;
+ return descriptor->data;
+}
+
+\f
+
+/* See gdb_bfd.h. */
+
+bfd *
+gdb_bfd_fopen (const char *filename, const char *target, const char *mode,
+ int fd)
+{
+ bfd *result = bfd_fopen (filename, target, mode, fd);
+
+ if (result)
+ {
+ gdb_bfd_stash_filename (result);
+ gdb_bfd_ref (result);
+ }
+
+ return result;
+}
+
+/* See gdb_bfd.h. */
+
+bfd *
+gdb_bfd_openr (const char *filename, const char *target)
+{
+ bfd *result = bfd_openr (filename, target);
+
+ if (result)
+ {
+ gdb_bfd_stash_filename (result);
+ gdb_bfd_ref (result);
+ }
+
+ return result;
+}
+
+/* See gdb_bfd.h. */
+
+bfd *
+gdb_bfd_openw (const char *filename, const char *target)
+{
+ bfd *result = bfd_openw (filename, target);
+
+ if (result)
+ {
+ gdb_bfd_stash_filename (result);
+ gdb_bfd_ref (result);
+ }
+
+ return result;
+}
+
+/* See gdb_bfd.h. */
+
+bfd *
+gdb_bfd_openr_iovec (const char *filename, const char *target,
+ void *(*open_func) (struct bfd *nbfd,
+ void *open_closure),
+ void *open_closure,
+ file_ptr (*pread_func) (struct bfd *nbfd,
+ void *stream,
+ void *buf,
+ file_ptr nbytes,
+ file_ptr offset),
+ int (*close_func) (struct bfd *nbfd,
+ void *stream),
+ int (*stat_func) (struct bfd *abfd,
+ void *stream,
+ struct stat *sb))
+{
+ bfd *result = bfd_openr_iovec (filename, target,
+ open_func, open_closure,
+ pread_func, close_func, stat_func);
+
+ if (result)
+ {
+ gdb_bfd_ref (result);
+ gdb_bfd_stash_filename (result);
+ }
+
+ return result;
+}
+
+/* See gdb_bfd.h. */
+
+void
+gdb_bfd_mark_parent (bfd *child, bfd *parent)
+{
+ struct gdb_bfd_data *gdata;
+
+ gdb_bfd_ref (child);
+ /* No need to stash the filename here, because we also keep a
+ reference on the parent archive. */
+
+ gdata = bfd_usrdata (child);
+ if (gdata->archive_bfd == NULL)
+ {
+ gdata->archive_bfd = parent;
+ gdb_bfd_ref (parent);
+ }
+ else
+ gdb_assert (gdata->archive_bfd == parent);
+}
+
+/* See gdb_bfd.h. */
+
+bfd *
+gdb_bfd_openr_next_archived_file (bfd *archive, bfd *previous)
+{
+ bfd *result = bfd_openr_next_archived_file (archive, previous);
+
+ if (result)
+ gdb_bfd_mark_parent (result, archive);
+
+ return result;
+}
+
+/* See gdb_bfd.h. */
+
+bfd *
+gdb_bfd_fdopenr (const char *filename, const char *target, int fd)
+{
+ bfd *result = bfd_fdopenr (filename, target, fd);
+
+ if (result)
+ {
+ gdb_bfd_ref (result);
+ gdb_bfd_stash_filename (result);
+ }
+
+ return result;
+}
+
+\f
+
+/* A callback for htab_traverse that prints a single BFD. */
+
+static int
+print_one_bfd (void **slot, void *data)
+{
+ bfd *abfd = *slot;
+ struct gdb_bfd_data *gdata = bfd_usrdata (abfd);
+ struct ui_out *uiout = data;
+ struct cleanup *inner;
+
+ inner = make_cleanup_ui_out_tuple_begin_end (uiout, NULL);
+ ui_out_field_int (uiout, "refcount", gdata->refc);
+ ui_out_field_string (uiout, "addr", host_address_to_string (abfd));
+ ui_out_field_string (uiout, "filename", bfd_get_filename (abfd));
+ ui_out_text (uiout, "\n");
+ do_cleanups (inner);
+
+ return 1;
+}
+
+/* Implement the 'maint info bfd' command. */
+
+static void
+maintenance_info_bfds (char *arg, int from_tty)
+{
+ struct cleanup *cleanup;
+ struct ui_out *uiout = current_uiout;
+
+ cleanup = make_cleanup_ui_out_table_begin_end (uiout, 3, -1, "bfds");
+ ui_out_table_header (uiout, 10, ui_left, "refcount", "Refcount");
+ ui_out_table_header (uiout, 18, ui_left, "addr", "Address");
+ ui_out_table_header (uiout, 40, ui_left, "filename", "Filename");
+
+ ui_out_table_body (uiout);
+ htab_traverse (all_bfds, print_one_bfd, uiout);
+
+ do_cleanups (cleanup);
+}
+
+/* -Wmissing-prototypes */
+extern initialize_file_ftype _initialize_gdb_bfd;
+
+void
+_initialize_gdb_bfd (void)
+{
+ all_bfds = htab_create_alloc (10, htab_hash_pointer, htab_eq_pointer,
+ NULL, xcalloc, xfree);
+
+ add_cmd ("bfds", class_maintenance, maintenance_info_bfds, _("\
+List the BFDs that are currently open."),
+ &maintenanceinfolist);
}
projects / deliverable / binutils-gdb.git / blobdiff