/* Definitions for BFD wrappers used by GDB.
- Copyright (C) 2011
- Free Software Foundation, Inc.
+ Copyright (C) 2011-2020 Free Software Foundation, Inc.
This file is part of GDB.
#include "defs.h"
#include "gdb_bfd.h"
-#include "gdb_assert.h"
-#include "gdb_string.h"
+#include "ui-out.h"
+#include "gdbcmd.h"
+#include "hashtab.h"
+#include "gdbsupport/filestuff.h"
+#ifdef HAVE_MMAP
+#include <sys/mman.h>
+#ifndef MAP_FAILED
+#define MAP_FAILED ((void *) -1)
+#endif
+#endif
+#include "target.h"
+#include "gdb/fileio.h"
+#include "inferior.h"
+
+/* 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;
+
+/* An object of this type is stored in each BFD's user data. */
+
+struct gdb_bfd_data
+{
+ gdb_bfd_data (bfd *abfd)
+ : mtime (bfd_get_mtime (abfd)),
+ size (bfd_get_size (abfd)),
+ relocation_computed (0),
+ needs_relocations (0),
+ crc_computed (0)
+ {
+ struct stat buf;
+
+ if (bfd_stat (abfd, &buf) == 0)
+ {
+ inode = buf.st_ino;
+ device_id = buf.st_dev;
+ }
+ else
+ {
+ /* The stat failed. */
+ inode = 0;
+ device_id = 0;
+ }
+ }
+
+ ~gdb_bfd_data ()
+ {
+ }
+
+ /* The reference count. */
+ int refc = 1;
+
+ /* The mtime of the BFD at the point the cache entry was made. */
+ time_t mtime;
+
+ /* The file size (in bytes) at the point the cache entry was made. */
+ off_t size;
+
+ /* The inode of the file at the point the cache entry was made. */
+ ino_t inode;
+
+ /* The device id of the file at the point the cache entry was made. */
+ dev_t device_id;
+
+ /* This is true if we have determined whether this BFD has any
+ sections requiring relocation. */
+ unsigned int relocation_computed : 1;
+
+ /* This is true if any section needs relocation. */
+ unsigned int needs_relocations : 1;
+
+ /* This is true if we have successfully computed the file's CRC. */
+ unsigned int crc_computed : 1;
+
+ /* The file's CRC. */
+ unsigned long crc = 0;
+
+ /* If the BFD comes from an archive, this points to the archive's
+ BFD. Otherwise, this is NULL. */
+ bfd *archive_bfd = nullptr;
+
+ /* Table of all the bfds this bfd has included. */
+ std::vector<gdb_bfd_ref_ptr> included_bfds;
+
+ /* 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;
+
+/* When true gdb will reuse an existing bfd object if the filename,
+ modification time, and file size all match. */
+
+static bool bfd_sharing = true;
+static void
+show_bfd_sharing (struct ui_file *file, int from_tty,
+ struct cmd_list_element *c, const char *value)
+{
+ fprintf_filtered (file, _("BFD sharing is %s.\n"), value);
+}
+
+/* When non-zero debugging of the bfd caches is enabled. */
+
+static unsigned int debug_bfd_cache;
+static void
+show_bfd_cache_debug (struct ui_file *file, int from_tty,
+ struct cmd_list_element *c, const char *value)
+{
+ fprintf_filtered (file, _("BFD cache debugging is %s.\n"), value);
+}
+
+/* The type of an object being looked up in gdb_bfd_cache. We use
+ htab's capability of storing one kind of object (BFD in this case)
+ and using a different sort of object for searching. */
+
+struct gdb_bfd_cache_search
+{
+ /* The filename. */
+ const char *filename;
+ /* The mtime. */
+ time_t mtime;
+ /* The file size (in bytes). */
+ off_t size;
+ /* The inode of the file. */
+ ino_t inode;
+ /* The device id of the file. */
+ dev_t device_id;
+};
+
+/* A hash function for BFDs. */
+
+static hashval_t
+hash_bfd (const void *b)
+{
+ const bfd *abfd = (const struct bfd *) b;
+
+ /* It is simplest to just hash the filename. */
+ return htab_hash_string (bfd_get_filename (abfd));
+}
+
+/* An equality function for BFDs. Note that this expects the caller
+ to search using struct gdb_bfd_cache_search only, not BFDs. */
+
+static int
+eq_bfd (const void *a, const void *b)
+{
+ const bfd *abfd = (const struct bfd *) a;
+ const struct gdb_bfd_cache_search *s
+ = (const struct gdb_bfd_cache_search *) b;
+ struct gdb_bfd_data *gdata = (struct gdb_bfd_data *) bfd_usrdata (abfd);
+
+ return (gdata->mtime == s->mtime
+ && gdata->size == s->size
+ && gdata->inode == s->inode
+ && gdata->device_id == s->device_id
+ && strcmp (bfd_get_filename (abfd), s->filename) == 0);
+}
/* See gdb_bfd.h. */
-void
-gdb_bfd_stash_filename (struct bfd *abfd)
+int
+is_target_filename (const char *name)
+{
+ return startswith (name, TARGET_SYSROOT_PREFIX);
+}
+
+/* See gdb_bfd.h. */
+
+int
+gdb_bfd_has_target_filename (struct bfd *abfd)
+{
+ return is_target_filename (bfd_get_filename (abfd));
+}
+
+
+/* Return the system error number corresponding to ERRNUM. */
+
+static int
+fileio_errno_to_host (int errnum)
+{
+ switch (errnum)
+ {
+ case FILEIO_EPERM:
+ return EPERM;
+ case FILEIO_ENOENT:
+ return ENOENT;
+ case FILEIO_EINTR:
+ return EINTR;
+ case FILEIO_EIO:
+ return EIO;
+ case FILEIO_EBADF:
+ return EBADF;
+ case FILEIO_EACCES:
+ return EACCES;
+ case FILEIO_EFAULT:
+ return EFAULT;
+ case FILEIO_EBUSY:
+ return EBUSY;
+ case FILEIO_EEXIST:
+ return EEXIST;
+ case FILEIO_ENODEV:
+ return ENODEV;
+ case FILEIO_ENOTDIR:
+ return ENOTDIR;
+ case FILEIO_EISDIR:
+ return EISDIR;
+ case FILEIO_EINVAL:
+ return EINVAL;
+ case FILEIO_ENFILE:
+ return ENFILE;
+ case FILEIO_EMFILE:
+ return EMFILE;
+ case FILEIO_EFBIG:
+ return EFBIG;
+ case FILEIO_ENOSPC:
+ return ENOSPC;
+ case FILEIO_ESPIPE:
+ return ESPIPE;
+ case FILEIO_EROFS:
+ return EROFS;
+ case FILEIO_ENOSYS:
+ return ENOSYS;
+ case FILEIO_ENAMETOOLONG:
+ return ENAMETOOLONG;
+ }
+ return -1;
+}
+
+/* bfd_openr_iovec OPEN_CLOSURE data for gdb_bfd_open. */
+struct gdb_bfd_open_closure
+{
+ inferior *inf;
+ bool warn_if_slow;
+};
+
+/* Wrapper for target_fileio_open suitable for passing as the
+ OPEN_FUNC argument to gdb_bfd_openr_iovec. */
+
+static void *
+gdb_bfd_iovec_fileio_open (struct bfd *abfd, void *open_closure)
+{
+ const char *filename = bfd_get_filename (abfd);
+ int fd, target_errno;
+ int *stream;
+ gdb_bfd_open_closure *oclosure = (gdb_bfd_open_closure *) open_closure;
+
+ gdb_assert (is_target_filename (filename));
+
+ fd = target_fileio_open (oclosure->inf,
+ filename + strlen (TARGET_SYSROOT_PREFIX),
+ FILEIO_O_RDONLY, 0, oclosure->warn_if_slow,
+ &target_errno);
+ if (fd == -1)
+ {
+ errno = fileio_errno_to_host (target_errno);
+ bfd_set_error (bfd_error_system_call);
+ return NULL;
+ }
+
+ stream = XCNEW (int);
+ *stream = fd;
+ return stream;
+}
+
+/* Wrapper for target_fileio_pread suitable for passing as the
+ PREAD_FUNC argument to gdb_bfd_openr_iovec. */
+
+static file_ptr
+gdb_bfd_iovec_fileio_pread (struct bfd *abfd, void *stream, void *buf,
+ file_ptr nbytes, file_ptr offset)
{
- char *name = bfd_get_filename (abfd);
- char *data;
+ int fd = *(int *) stream;
+ int target_errno;
+ file_ptr pos, bytes;
- data = bfd_alloc (abfd, strlen (name) + 1);
- strcpy (data, name);
+ pos = 0;
+ while (nbytes > pos)
+ {
+ QUIT;
+
+ bytes = target_fileio_pread (fd, (gdb_byte *) buf + pos,
+ nbytes - pos, offset + pos,
+ &target_errno);
+ if (bytes == 0)
+ /* Success, but no bytes, means end-of-file. */
+ break;
+ if (bytes == -1)
+ {
+ errno = fileio_errno_to_host (target_errno);
+ bfd_set_error (bfd_error_system_call);
+ return -1;
+ }
+
+ pos += bytes;
+ }
+
+ return pos;
+}
+
+/* Wrapper for target_fileio_close suitable for passing as the
+ CLOSE_FUNC argument to gdb_bfd_openr_iovec. */
+
+static int
+gdb_bfd_iovec_fileio_close (struct bfd *abfd, void *stream)
+{
+ int fd = *(int *) stream;
+ int target_errno;
- /* Unwarranted chumminess with BFD. */
- abfd->filename = data;
+ xfree (stream);
+
+ /* Ignore errors on close. These may happen with remote
+ targets if the connection has already been torn down. */
+ target_fileio_close (fd, &target_errno);
+
+ /* Zero means success. */
+ return 0;
+}
+
+/* Wrapper for target_fileio_fstat suitable for passing as the
+ STAT_FUNC argument to gdb_bfd_openr_iovec. */
+
+static int
+gdb_bfd_iovec_fileio_fstat (struct bfd *abfd, void *stream,
+ struct stat *sb)
+{
+ int fd = *(int *) stream;
+ int target_errno;
+ int result;
+
+ result = target_fileio_fstat (fd, sb, &target_errno);
+ if (result == -1)
+ {
+ errno = fileio_errno_to_host (target_errno);
+ bfd_set_error (bfd_error_system_call);
+ }
+
+ return result;
+}
+
+/* See gdb_bfd.h. */
+
+gdb_bfd_ref_ptr
+gdb_bfd_open (const char *name, const char *target, int fd,
+ bool warn_if_slow)
+{
+ hashval_t hash;
+ void **slot;
+ bfd *abfd;
+ struct gdb_bfd_cache_search search;
+ struct stat st;
+
+ if (is_target_filename (name))
+ {
+ if (!target_filesystem_is_local ())
+ {
+ gdb_assert (fd == -1);
+
+ gdb_bfd_open_closure open_closure { current_inferior (), warn_if_slow };
+ return gdb_bfd_openr_iovec (name, target,
+ gdb_bfd_iovec_fileio_open,
+ &open_closure,
+ gdb_bfd_iovec_fileio_pread,
+ gdb_bfd_iovec_fileio_close,
+ gdb_bfd_iovec_fileio_fstat);
+ }
+
+ name += strlen (TARGET_SYSROOT_PREFIX);
+ }
+
+ if (gdb_bfd_cache == NULL)
+ gdb_bfd_cache = htab_create_alloc (1, hash_bfd, eq_bfd, NULL,
+ xcalloc, xfree);
+
+ if (fd == -1)
+ {
+ fd = gdb_open_cloexec (name, O_RDONLY | O_BINARY, 0);
+ if (fd == -1)
+ {
+ bfd_set_error (bfd_error_system_call);
+ return NULL;
+ }
+ }
+
+ search.filename = name;
+ if (fstat (fd, &st) < 0)
+ {
+ /* Weird situation here. */
+ search.mtime = 0;
+ search.size = 0;
+ search.inode = 0;
+ search.device_id = 0;
+ }
+ else
+ {
+ search.mtime = st.st_mtime;
+ search.size = st.st_size;
+ search.inode = st.st_ino;
+ search.device_id = st.st_dev;
+ }
+
+ /* Note that this must compute the same result as hash_bfd. */
+ hash = htab_hash_string (name);
+ /* Note that we cannot use htab_find_slot_with_hash here, because
+ opening the BFD may fail; and this would violate hashtab
+ invariants. */
+ abfd = (struct bfd *) htab_find_with_hash (gdb_bfd_cache, &search, hash);
+ if (bfd_sharing && abfd != NULL)
+ {
+ if (debug_bfd_cache)
+ fprintf_unfiltered (gdb_stdlog,
+ "Reusing cached bfd %s for %s\n",
+ host_address_to_string (abfd),
+ bfd_get_filename (abfd));
+ close (fd);
+ return gdb_bfd_ref_ptr::new_reference (abfd);
+ }
+
+ abfd = bfd_fopen (name, target, FOPEN_RB, fd);
+ if (abfd == NULL)
+ return NULL;
+
+ if (debug_bfd_cache)
+ fprintf_unfiltered (gdb_stdlog,
+ "Creating new bfd %s for %s\n",
+ host_address_to_string (abfd),
+ bfd_get_filename (abfd));
+
+ if (bfd_sharing)
+ {
+ slot = htab_find_slot_with_hash (gdb_bfd_cache, &search, hash, INSERT);
+ gdb_assert (!*slot);
+ *slot = abfd;
+ }
+
+ return gdb_bfd_ref_ptr::new_reference (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
+ = (struct gdb_bfd_section_data *) bfd_section_userdata (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. */
gdb_bfd_close_or_warn (struct bfd *abfd)
{
int ret;
- char *name = bfd_get_filename (abfd);
+ const char *name = bfd_get_filename (abfd);
+
+ bfd_map_over_sections (abfd, free_one_bfd_section, NULL);
ret = bfd_close (abfd);
return ret;
}
-/* Add reference to ABFD. Returns ABFD. */
+/* See gdb_bfd.h. */
-struct bfd *
+void
gdb_bfd_ref (struct bfd *abfd)
{
- int *p_refcount;
+ struct gdb_bfd_data *gdata;
+ void **slot;
if (abfd == NULL)
- return NULL;
+ return;
+
+ gdata = (struct gdb_bfd_data *) bfd_usrdata (abfd);
- p_refcount = bfd_usrdata (abfd);
+ if (debug_bfd_cache)
+ fprintf_unfiltered (gdb_stdlog,
+ "Increase reference count on bfd %s (%s)\n",
+ host_address_to_string (abfd),
+ bfd_get_filename (abfd));
- if (p_refcount != NULL)
+ if (gdata != NULL)
{
- *p_refcount += 1;
- return abfd;
+ gdata->refc += 1;
+ return;
}
- p_refcount = xmalloc (sizeof (*p_refcount));
- *p_refcount = 1;
- bfd_usrdata (abfd) = p_refcount;
+ /* Ask BFD to decompress sections in bfd_get_full_section_contents. */
+ abfd->flags |= BFD_DECOMPRESS;
+
+ gdata = new gdb_bfd_data (abfd);
+ bfd_set_usrdata (abfd, gdata);
+ bfd_alloc_data (abfd);
- return 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)
{
- int *p_refcount;
- char *name;
+ struct gdb_bfd_data *gdata;
+ struct gdb_bfd_cache_search search;
+ bfd *archive_bfd;
if (abfd == NULL)
return;
- p_refcount = bfd_usrdata (abfd);
- gdb_assert (*p_refcount >= 1);
+ gdata = (struct gdb_bfd_data *) bfd_usrdata (abfd);
+ gdb_assert (gdata->refc >= 1);
- *p_refcount -= 1;
- if (*p_refcount > 0)
- return;
+ gdata->refc -= 1;
+ if (gdata->refc > 0)
+ {
+ if (debug_bfd_cache)
+ fprintf_unfiltered (gdb_stdlog,
+ "Decrease reference count on bfd %s (%s)\n",
+ host_address_to_string (abfd),
+ bfd_get_filename (abfd));
+ return;
+ }
+
+ if (debug_bfd_cache)
+ fprintf_unfiltered (gdb_stdlog,
+ "Delete final reference count on bfd %s (%s)\n",
+ host_address_to_string (abfd),
+ bfd_get_filename (abfd));
+
+ archive_bfd = gdata->archive_bfd;
+ search.filename = bfd_get_filename (abfd);
+
+ if (gdb_bfd_cache && search.filename)
+ {
+ hashval_t hash = htab_hash_string (search.filename);
+ void **slot;
+
+ search.mtime = gdata->mtime;
+ search.size = gdata->size;
+ search.inode = gdata->inode;
+ search.device_id = gdata->device_id;
+ slot = htab_find_slot_with_hash (gdb_bfd_cache, &search, hash,
+ NO_INSERT);
+
+ if (slot && *slot)
+ htab_clear_slot (gdb_bfd_cache, slot);
+ }
- xfree (p_refcount);
- bfd_usrdata (abfd) = NULL; /* Paranoia. */
+ bfd_free_data (abfd);
+ delete gdata;
+ bfd_set_usrdata (abfd, NULL); /* Paranoia. */
+
+ htab_remove_elt (all_bfds, abfd);
- name = bfd_get_filename (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 = (struct gdb_bfd_section_data *) bfd_section_userdata (section);
+
+ if (result == NULL)
+ {
+ result = ((struct gdb_bfd_section_data *)
+ bfd_zalloc (section->owner, sizeof (*result)));
+ bfd_set_section_userdata (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_section_size (sectp) > 4 * pagesize)
+ {
+ descriptor->size = bfd_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_section_size (sectp);
+ descriptor->data = NULL;
+
+ data = NULL;
+ if (!bfd_get_full_section_contents (abfd, sectp, &data))
+ {
+ warning (_("Can't read data for section '%s' in file '%s'"),
+ bfd_section_name (sectp),
+ bfd_get_filename (abfd));
+ /* Set size to 0 to prevent further attempts to read the invalid
+ section. */
+ *size = 0;
+ return NULL;
+ }
+ descriptor->data = data;
+
+ done:
+ gdb_assert (descriptor->data != NULL);
+ *size = descriptor->size;
+ return (const gdb_byte *) descriptor->data;
+}
+
+/* Return 32-bit CRC for ABFD. If successful store it to *FILE_CRC_RETURN and
+ return 1. Otherwise print a warning and return 0. ABFD seek position is
+ not preserved. */
+
+static int
+get_file_crc (bfd *abfd, unsigned long *file_crc_return)
+{
+ unsigned long file_crc = 0;
+
+ if (bfd_seek (abfd, 0, SEEK_SET) != 0)
+ {
+ warning (_("Problem reading \"%s\" for CRC: %s"),
+ bfd_get_filename (abfd), bfd_errmsg (bfd_get_error ()));
+ return 0;
+ }
+
+ for (;;)
+ {
+ gdb_byte buffer[8 * 1024];
+ bfd_size_type count;
+
+ count = bfd_bread (buffer, sizeof (buffer), abfd);
+ if (count == (bfd_size_type) -1)
+ {
+ warning (_("Problem reading \"%s\" for CRC: %s"),
+ bfd_get_filename (abfd), bfd_errmsg (bfd_get_error ()));
+ return 0;
+ }
+ if (count == 0)
+ break;
+ file_crc = bfd_calc_gnu_debuglink_crc32 (file_crc, buffer, count);
+ }
+
+ *file_crc_return = file_crc;
+ return 1;
+}
+
+/* See gdb_bfd.h. */
+
+int
+gdb_bfd_crc (struct bfd *abfd, unsigned long *crc_out)
+{
+ struct gdb_bfd_data *gdata = (struct gdb_bfd_data *) bfd_usrdata (abfd);
+
+ if (!gdata->crc_computed)
+ gdata->crc_computed = get_file_crc (abfd, &gdata->crc);
+
+ if (gdata->crc_computed)
+ *crc_out = gdata->crc;
+ return gdata->crc_computed;
+}
+
+\f
+
+/* See gdb_bfd.h. */
+
+gdb_bfd_ref_ptr
+gdb_bfd_fopen (const char *filename, const char *target, const char *mode,
+ int fd)
+{
+ bfd *result = bfd_fopen (filename, target, mode, fd);
+
+ return gdb_bfd_ref_ptr::new_reference (result);
+}
+
+/* See gdb_bfd.h. */
+
+gdb_bfd_ref_ptr
+gdb_bfd_openr (const char *filename, const char *target)
+{
+ bfd *result = bfd_openr (filename, target);
+
+ return gdb_bfd_ref_ptr::new_reference (result);
+}
+
+/* See gdb_bfd.h. */
+
+gdb_bfd_ref_ptr
+gdb_bfd_openw (const char *filename, const char *target)
+{
+ bfd *result = bfd_openw (filename, target);
+
+ return gdb_bfd_ref_ptr::new_reference (result);
+}
+
+/* See gdb_bfd.h. */
+
+gdb_bfd_ref_ptr
+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);
+
+ return gdb_bfd_ref_ptr::new_reference (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 = (struct gdb_bfd_data *) 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. */
+
+gdb_bfd_ref_ptr
+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 gdb_bfd_ref_ptr (result);
+}
+
+/* See gdb_bfd.h. */
+
+void
+gdb_bfd_record_inclusion (bfd *includer, bfd *includee)
+{
+ struct gdb_bfd_data *gdata;
+
+ gdata = (struct gdb_bfd_data *) bfd_usrdata (includer);
+ gdata->included_bfds.push_back (gdb_bfd_ref_ptr::new_reference (includee));
+}
+
+\f
+
+gdb_static_assert (ARRAY_SIZE (_bfd_std_section) == 4);
+
+/* See gdb_bfd.h. */
+
+int
+gdb_bfd_section_index (bfd *abfd, asection *section)
+{
+ if (section == NULL)
+ return -1;
+ else if (section == bfd_com_section_ptr)
+ return bfd_count_sections (abfd);
+ else if (section == bfd_und_section_ptr)
+ return bfd_count_sections (abfd) + 1;
+ else if (section == bfd_abs_section_ptr)
+ return bfd_count_sections (abfd) + 2;
+ else if (section == bfd_ind_section_ptr)
+ return bfd_count_sections (abfd) + 3;
+ return section->index;
+}
+
+/* See gdb_bfd.h. */
+
+int
+gdb_bfd_count_sections (bfd *abfd)
+{
+ return bfd_count_sections (abfd) + 4;
+}
+
+/* See gdb_bfd.h. */
+
+int
+gdb_bfd_requires_relocations (bfd *abfd)
+{
+ struct gdb_bfd_data *gdata = (struct gdb_bfd_data *) bfd_usrdata (abfd);
+
+ if (gdata->relocation_computed == 0)
+ {
+ asection *sect;
+
+ for (sect = abfd->sections; sect != NULL; sect = sect->next)
+ if ((sect->flags & SEC_RELOC) != 0)
+ {
+ gdata->needs_relocations = 1;
+ break;
+ }
+
+ gdata->relocation_computed = 1;
+ }
+
+ return gdata->needs_relocations;
+}
+
+/* See gdb_bfd.h. */
+
+bool
+gdb_bfd_get_full_section_contents (bfd *abfd, asection *section,
+ gdb::byte_vector *contents)
+{
+ bfd_size_type section_size = bfd_section_size (section);
+
+ contents->resize (section_size);
+
+ return bfd_get_section_contents (abfd, section, contents->data (), 0,
+ section_size);
+}
+
+/* A callback for htab_traverse that prints a single BFD. */
+
+static int
+print_one_bfd (void **slot, void *data)
+{
+ bfd *abfd = (struct bfd *) *slot;
+ struct gdb_bfd_data *gdata = (struct gdb_bfd_data *) bfd_usrdata (abfd);
+ struct ui_out *uiout = (struct ui_out *) data;
+
+ ui_out_emit_tuple tuple_emitter (uiout, NULL);
+ uiout->field_signed ("refcount", gdata->refc);
+ uiout->field_string ("addr", host_address_to_string (abfd));
+ uiout->field_string ("filename", bfd_get_filename (abfd));
+ uiout->text ("\n");
+
+ return 1;
+}
+
+/* Implement the 'maint info bfd' command. */
+
+static void
+maintenance_info_bfds (const char *arg, int from_tty)
+{
+ struct ui_out *uiout = current_uiout;
+
+ ui_out_emit_table table_emitter (uiout, 3, -1, "bfds");
+ uiout->table_header (10, ui_left, "refcount", "Refcount");
+ uiout->table_header (18, ui_left, "addr", "Address");
+ uiout->table_header (40, ui_left, "filename", "Filename");
+
+ uiout->table_body ();
+ htab_traverse (all_bfds, print_one_bfd, uiout);
+}
+
+void _initialize_gdb_bfd ();
+void
+_initialize_gdb_bfd ()
+{
+ 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);
+
+ add_setshow_boolean_cmd ("bfd-sharing", no_class,
+ &bfd_sharing, _("\
+Set whether gdb will share bfds that appear to be the same file."), _("\
+Show whether gdb will share bfds that appear to be the same file."), _("\
+When enabled gdb will reuse existing bfds rather than reopening the\n\
+same file. To decide if two files are the same then gdb compares the\n\
+filename, file size, file modification time, and file inode."),
+ NULL,
+ &show_bfd_sharing,
+ &maintenance_set_cmdlist,
+ &maintenance_show_cmdlist);
+
+ add_setshow_zuinteger_cmd ("bfd-cache", class_maintenance,
+ &debug_bfd_cache, _("\
+Set bfd cache debugging."), _("\
+Show bfd cache debugging."), _("\
+When non-zero, bfd cache specific debugging is enabled."),
+ NULL,
+ &show_bfd_cache_debug,
+ &setdebuglist, &showdebuglist);
}
projects / deliverable / binutils-gdb.git / blobdiff