[PATCH v2 0/3] bfd cache: tighten match criteria and debug commands.

[Andrew Burgess <andrew.burgess@embecosm.com>]

This is a revision of a patch set that I posted here:
  https://sourceware.org/ml/gdb-patches/2015-04/msg00471.html

The differences in each patch are as follows:

  1/3

  I hope that I addressed everyones comments.  I added comparison of
  inode and device-id fields as suggested by Pedro.

  Gary pointed out a few places where we fake the stat results,
  however, these are all for specialised targets that I don't think
  will be using the bfd caching anyway, the caching is only used for
  local files, ones that can be targeted with a local 'stat' command.
  
  It was also pointed out that Windows does not set the inode field of
  the stat struture.  Pedro semi-suggested that for such targets
  caching should be disabled, while Eli pointed out Windows has an
  alternative API to get the similar data.

  In the end I did neither of these things for the following reasons:

  - Caching provides a general benefit in the common use case.  The
    problem area is basically an edge case in automatted testing.
    Punishing all users (on Windows) because of such a small edge
    case, and one that has existed for a long time feels harsh.

  - To slightly mitigate the above I have left the check of file size
    in place.  In my experience this is often enough to make the
    problem invisible.

  - I don't have a Windows machine for development or testing, but if
    someone else wanted to make use of the Windows API to supply an
    inode like result, this can be easily filled in within
    gdb_bfd_open.

  2/3
  3/3

  Added documentation to the gdb.texinfo file.  I created a whole new
  section to talk about file caching.  I don't know if I filled in
  enough detail, but hopefully what I've written makes sense and is a
  starting point.  I placed all the command documentation there, even
  the maintenance commands, there is precedent for having maintenance
  commands mixed in with other commands so I hope that that will also
  be acceptable.

Andrew Burgess (3):
  gdb: Improve cache matching criteria for the bfd cache.
  gdb: New maintenance command to disable bfd sharing.
  gdb: Add debug tracing for bfd cache activity.

 gdb/ChangeLog       |  26 ++++++++++++
 gdb/NEWS            |   8 ++++
 gdb/doc/ChangeLog   |  11 +++++
 gdb/doc/gdb.texinfo |  45 +++++++++++++++++---
 gdb/gdb_bfd.c       | 118 +++++++++++++++++++++++++++++++++++++++++++++++++---
 5 files changed, 197 insertions(+), 11 deletions(-)

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2.4.0