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avoid python exception in FrameDecorator.py

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This fixes a bug in FrameDecorator.py.

FrameVars seems to assume that Frame.block can return None if there is
no block.  However, it actually throws an exception.

I saw this bug while developing a frame filter, but unfortunately I
don't know how to reproduce it.  It seems to me that the SAL tests in
_is_limited_frame should exclude the bad cases; and in my attempts to
write a test they do.

Nevertheless I think the fix is reasonably obvious and ought to go in.

2014-01-23  Tom Tromey  <tromey@redhat.com>

	PR python/16485:
	* python/lib/gdb/FrameDecorator.py: (FrameVars.fetch_frame_args):
	Handle exception from frame.block.
	(FrameVars.fetch_frame_locals): Likewise.
This commit is contained in:
Tom Tromey 2014-01-22 08:52:15 -07:00
parent 0740f8d82d
commit 83b645b833
2 changed files with 17 additions and 2 deletions
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7
gdb/ChangeLog
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@ -1,3 +1,10 @@
2014-01-23 Tom Tromey <tromey@redhat.com>
PR python/16485:
* python/lib/gdb/FrameDecorator.py: (FrameVars.fetch_frame_args):
Handle exception from frame.block.
(FrameVars.fetch_frame_locals): Likewise.
2014-01-23 Tom Tromey <tromey@redhat.com>
PR python/16487:

8
gdb/python/lib/gdb/FrameDecorator.py
View File

@ -258,7 +258,10 @@ class FrameVars(object):
are no frame local variables, return an empty list."""
lvars = []
try:
block = self.frame.block()
except RuntimeError:
block = None
while block != None:
if block.is_global or block.is_static:
@ -279,7 +282,12 @@ class FrameVars(object):
there are no frame argument variables, return an empty list."""
args = []
try:
block = self.frame.block()
except RuntimeError:
block = None
while block != None:
if block.function != None:
break