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| author | Andrew Burgess <andrew.burgess@embecosm.com> | 2018-07-13 12:01:16 +0100 |
|---|---|---|
| committer | Andrew Burgess <andrew.burgess@embecosm.com> | 2018-07-26 08:53:02 +0100 |
| commit | 3c3bb0580be0027a1c7187b78c747af74dcfa884 (patch) | |
| tree | 4b643758965fcbbec45e7f3e1f2b4913d392cb66 /gdb/testsuite | |
| parent | 33cb30a1f932b5a211aa319a01783d4957ae5d57 (diff) | |
| download | gdb-3c3bb0580be0027a1c7187b78c747af74dcfa884.zip gdb-3c3bb0580be0027a1c7187b78c747af74dcfa884.tar.gz gdb-3c3bb0580be0027a1c7187b78c747af74dcfa884.tar.bz2 | |
gdb: Add switch to disable DWARF stack unwinders
Add a maintenance command to disable the DWARF stack unwinders.
Normal users would not need this feature, but it is useful to allow
extended testing of fallback stack unwinding strategies, for example,
prologue scanners.
This is a partial implementation of the idea discussed in pr gdb/8434,
which talks about a generic ability to disable any frame unwinder.
Being able to arbitrarily disable any frame unwinder would be a more
complex patch, and I was unsure how useful such a feature would really
be, however, I can see (and have) a real need to disable DWARF
unwinders. That's why this patch only targets that specific set of
unwinders.
If in the future we find ourselves adding more switches to disable
different unwinders, then we should probably move to a more generic
solution, and remove this patch.
gdb/ChangeLog:
* dwarf2-frame-tailcall.c (tailcall_frame_sniffer): Exit early if
DWARF unwinders are disabled.
* dwarf2-frame.c: Add dwarf2read.h include.
(dwarf2_frame_sniffer): Exit early if DWARF unwinders are
disabled.
(dwarf2_frame_unwinders_enabled_p): Define.
(show_dwarf_unwinders_enabled_p): New function.
(_initialize_dwarf2_frame): Register switch to control DWARF
unwinder use.
* dwarf2-frame.h (dwarf2_frame_unwinders_enabled_p): Declare.
* dwarf2read.c (set_dwarf_cmdlist): Remove static keyword.
(show_dwarf_cmdlist): Remove static keyword.
* dwarf2read.h (set_dwarf_cmdlist): Declare.
(show_dwarf_cmdlist): Declare.
* NEWS: Document new feature.
gdb/doc/ChangeLog:
* gdb.texinfo (Maintenance Commands): Add description of
maintenance command to control dwarf unwinders.
gdb/testsuite/ChangeLog:
* gdb.base/maint.exp: Add check that dwarf unwinders control flag
is visible.
Diffstat (limited to 'gdb/testsuite')
| -rw-r--r-- | gdb/testsuite/ChangeLog | 5 | ||||
| -rw-r--r-- | gdb/testsuite/gdb.base/maint.exp | 4 |
2 files changed, 9 insertions, 0 deletions
diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog index aa8b06a..cdba393 100644 --- a/gdb/testsuite/ChangeLog +++ b/gdb/testsuite/ChangeLog @@ -1,3 +1,8 @@ +2018-07-26 Andrew Burgess <andrew.burgess@embecosm.com> + + * gdb.base/maint.exp: Add check that dwarf unwinders control flag + is visible. + 2018-07-26 Tom de Vries <tdevries@suse.de> PR breakpoints/23366 diff --git a/gdb/testsuite/gdb.base/maint.exp b/gdb/testsuite/gdb.base/maint.exp index 92086ee..ee0d089 100644 --- a/gdb/testsuite/gdb.base/maint.exp +++ b/gdb/testsuite/gdb.base/maint.exp @@ -526,6 +526,10 @@ gdb_test_no_output "maint info line-table xxx.c" \ set timeout $oldtimeout +# Just check that the DWARF unwinders control flag is visible. +gdb_test "maint show dwarf unwinders" \ + "The DWARF stack unwinders are currently (on|off)\\." + #============test help on maint commands test_prefix_command_help {"maint info" "maintenance info"} { |