[PATCH 0/9] Centralize unwinder api exceptions handling

[Yao Qi <qiyaoltc at gmail dot com>]

This patch series changes GDB to handle unwinder api exceptions in target
independent code, instead of in each unwinder.  See more details on patch
#5.  Patch 6 ~ 9 lifts the restrictions on each unwinder, that is, each
unwinder has to handle NOT_AVAILABLE_ERROR.  Patches 1 ~ 4 are preparatory
ones.  They can go in independently.

The patch series is tested on x86_64-linux and aarch64-linux.  Note that
rs6000 and s390 unwinders still catch exceptions.  I'll change them latter,
as I still need sometime understanding the code.

*** BLURB HERE ***

Yao Qi (9):
  Move dwarf2_frame_state_reg.exp_len to union .loc
  Class-fy dwarf2_frame_state
  Class-fy dwarf2_frame_state_reg_info
  Reset *THIS_CACHE in frame_unwind_try_unwinder in case of exception
  Handle unwinding exceptions
  Throw exception in dwarf2 unwinders
  Throw exception in amd64 unwinders
  Throw exception in i386 unwinders
  Throw exception in aarch64 unwinder

 gdb/aarch64-tdep.c |  48 +-------
 gdb/amd64-tdep.c   |  95 ++++-----------
 gdb/dwarf2-frame.c | 331 +++++++++++++++++++++++------------------------------
 gdb/dwarf2-frame.h | 114 ++++++++++++++----
 gdb/frame-unwind.c |   7 +-
 gdb/frame-unwind.h |   3 +-
 gdb/frame.c        | 109 +++++++++++++++---
 gdb/i386-tdep.c    | 111 +++++-------------
 gdb/sparc-tdep.c   |   2 +-
 9 files changed, 390 insertions(+), 430 deletions(-)

-- 
1.9.1