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scripts/gdb: provide exception catching parser 

If we attempt to read a value that is not available to GDB, an exception
is raised.  Most of the time, this is a good thing; however on occasion
we will want to be able to determine if a symbol is available.

By catching the exception to simply return None, we can determine if we
tried to read an invalid value, without the exception taking our
execution context away from us

Link: http://lkml.kernel.org/r/c72b25c06fc66e1d68371154097e2cbb112555d8.1462865983.git.jan.kiszka@siemens.com
Signed-off-by: Kieran Bingham <kieran.bingham@linaro.org>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Kieran Bingham 2016-05-23 16:24:48 -07:00 committed by Linus Torvalds
parent 619ccaf3e9
commit e78f3d70b3
1 changed files with 7 additions and 0 deletions
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7
scripts/gdb/linux/utils.py
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@ -154,3 +154,10 @@ def get_gdbserver_type():
if gdbserver_type is not None and hasattr(gdb, 'events'): if gdbserver_type is not None and hasattr(gdb, 'events'):
gdb.events.exited.connect(exit_handler) gdb.events.exited.connect(exit_handler)
return gdbserver_type return gdbserver_type
def gdb_eval_or_none(expresssion):
try:
return gdb.parse_and_eval(expresssion)
except:
return None