[PATCH v3 0/5] Fix lost events, and handle multiple step-overs.

[Pedro Alves <palves at redhat dot com>]

Here's v3.  This version mainly addresses Doug's review of patch 2 of
v2.  As the rest of the series would no longer apply and one patch
needed a minor corresponding tweak, I'm resending it all.

v2 was here:

https://sourceware.org/ml/gdb-patches/2014-03/msg00128.html

v1 was here:

https://sourceware.org/ml/gdb-patches/2014-02/msg00761.html.


What remains is related to GDB losing events - breakpoints and
watchpoints - in some situations, about teaching GDB that it might
need to step over breakpoints in multiple threads.

One nice side effect of patch #2 is that GDB no longer removes/inserts
_all_ breakpoints when stepping over one.  GDB after that only removes
the breakpoint being stepped over.  This eliminates a lot of z0/Z0 RSP
traffic if you have a lot of breakpoints, and have a conditional or
thread-specific breakpoint constantly triggering and not causing a
user-visible stop.

This changes heavily core run control code, which affects software
single-step targets too.  For more comfortable development and
testing, I actually hacked on this against my software single-step on
x86 branch first.

Tested on x86_64 Fedora 17, against pristine mainline, and against a
series that implements software single-step on x86-64.

For convenience, you can find this series at:

 git@github.com:palves/gdb.git fix_a_bunch_of_run_control_bugs_v3

and with software single-step on x86 on top:

 git@github.com:palves/gdb.git fix_a_bunch_of_run_control_bugs_v3_sss

In absence of barring comments, I plan to push this in soon.

Changes in v3:

 - Polish patch for PR breakpoints/7143, in response to Doug's review.

Changes in v2:

 - Two patches of v1 applied.

 - Order of some of the remaining patches changed.

 - Bugs that exposed were fixed.

 - One test moved to a different patch and got extended to cover
   another scenario gdb was mishandling and this series fixes.

 - Yao's review comments to v1's tests (to date) are addressed.

 - Software single-step breakpoints are not longer converted to real
   breakpoints.

Pedro Alves (5):
  Fix missing breakpoint/watchpoint hits, eliminate deferred_step_ptid.
  PR breakpoints/7143 - Watchpoint does not trigger when first set
  Fix for even more missed events; eliminate thread-hop code.
  Handle multiple step-overs.
  Make signal-while-stepping-over-bp-other-thread.exp run against
    remote targets too.

 gdb/breakpoint.c                                   |  25 +-
 gdb/breakpoint.h                                   |  13 +
 gdb/inferior.h                                     |   6 +
 gdb/infrun.c                                       | 765 ++++++++++-----------
 gdb/testsuite/gdb.base/watchpoint.exp              |  13 +-
 gdb/testsuite/gdb.cp/annota2.exp                   |   3 -
 gdb/testsuite/gdb.cp/annota3.exp                   |   3 -
 gdb/testsuite/gdb.threads/multiple-step-overs.c    | 105 +++
 gdb/testsuite/gdb.threads/multiple-step-overs.exp  |  80 +++
 .../signal-while-stepping-over-bp-other-thread.c   |   2 +
 .../signal-while-stepping-over-bp-other-thread.exp |  16 +-
 .../gdb.threads/step-over-lands-on-breakpoint.c    |  65 ++
 .../gdb.threads/step-over-lands-on-breakpoint.exp  |  62 ++
 .../gdb.threads/step-over-trips-on-watchpoint.c    |  67 ++
 .../gdb.threads/step-over-trips-on-watchpoint.exp  |  90 +++
 15 files changed, 877 insertions(+), 438 deletions(-)
 create mode 100644 gdb/testsuite/gdb.threads/multiple-step-overs.c
 create mode 100644 gdb/testsuite/gdb.threads/multiple-step-overs.exp
 create mode 100644 gdb/testsuite/gdb.threads/step-over-lands-on-breakpoint.c
 create mode 100644 gdb/testsuite/gdb.threads/step-over-lands-on-breakpoint.exp
 create mode 100644 gdb/testsuite/gdb.threads/step-over-trips-on-watchpoint.c
 create mode 100644 gdb/testsuite/gdb.threads/step-over-trips-on-watchpoint.exp

-- 
1.7.11.7