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Tom Tromey 3e5ec878a4 Avoid crash in varobj deletion 
PR varobj/28131 points out a crash in the varobj deletion code.  It
took a while to reproduce this, but essentially what happens is that a
top-level varobj deletes its root object, then deletes the "dynamic"
object.  However, deletion of the dynamic object may cause
~py_varobj_iter to run, which in turn uses gdbpy_enter_varobj:

gdbpy_enter_varobj::gdbpy_enter_varobj (const struct varobj *var)
: gdbpy_enter (var->root->exp->gdbarch, var->root->exp->language_defn)
{
}

However, because var->root has already been destroyed, this is
invalid.

I've added a new test case.  This doesn't reliably crash, but the
problem can easily be seen under valgrind (and, I presume, with ASAN,
though I did not try this).

Tested on x86-64 Fedora 32.  I also propose putting this on the GDB 11
branch, with a suitable ChangeLog entry of course.

Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=28131

(cherry picked from commit 4d0754c5f5)

gdb/ChangeLog
2021-08-02  Tom Tromey  <tromey@adacore.com>

	PR varobj/28131
	* varobj.c (~varobj): Delete 'dynamic' before 'root'.

gdb/testsuite/ChangeLog
2021-08-02  Tom Tromey  <tromey@adacore.com>

	PR varobj/28131
	* gdb.python/py-mi-var-info-path-expression.exp: Add regression
	test.
2021-08-02 09:48:58 -06:00
..
amd64-py-framefilter-invalidarg.S
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compare-enum-type-a.c
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compare-enum-type-b.c
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compare-enum-type.exp
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compare-enum-type.h
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2021-01-01 12:12:21 +04:00
flexible-array-member.c
gdb: fix getting range of flexible array member in Python
2021-04-22 15:01:28 -04:00
flexible-array-member.exp
gdb/testsuite: adjust gdb.python/flexible-array-member.exp expected pattern
2021-05-04 11:20:19 -04:00
lib-types.cc
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lib-types.exp
gdb/testsuite: check the correct Python variable in test
2021-03-12 12:18:33 +00:00
libpy-autoloaded-pretty-printers-in-newobjfile-event.so-gdb.py
gdb: do autoload before notifying Python side in new_objfile event
2021-04-27 11:22:32 -04:00
py-arch-reg-groups.exp
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py-arch-reg-names.exp
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py-arch.c
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py-arch.exp
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py-as-string.c
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py-as-string.exp
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py-auto-load-chaining-f1.c
gdb: use make_scoped_restore to restore gdbpy_current_objfile
2021-03-15 09:21:37 +00:00
py-auto-load-chaining-f1.o-gdb.py
gdb: re-format Python files using black 21.4b0
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py-auto-load-chaining-f2.c
gdb: use make_scoped_restore to restore gdbpy_current_objfile
2021-03-15 09:21:37 +00:00
py-auto-load-chaining-f2.o-gdb.py
gdb: re-format Python files using black 21.4b0
2021-05-07 10:56:20 -04:00
py-auto-load-chaining.c
gdb: use make_scoped_restore to restore gdbpy_current_objfile
2021-03-15 09:21:37 +00:00
py-auto-load-chaining.exp
gdb: use make_scoped_restore to restore gdbpy_current_objfile
2021-03-15 09:21:37 +00:00
py-autoloaded-pretty-printers-in-newobjfile-event-lib.cc
gdb: do autoload before notifying Python side in new_objfile event
2021-04-27 11:22:32 -04:00
py-autoloaded-pretty-printers-in-newobjfile-event-lib.h
gdb: do autoload before notifying Python side in new_objfile event
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py-autoloaded-pretty-printers-in-newobjfile-event-main.cc
gdb: do autoload before notifying Python side in new_objfile event
2021-04-27 11:22:32 -04:00
py-autoloaded-pretty-printers-in-newobjfile-event.exp
gdb: do autoload before notifying Python side in new_objfile event
2021-04-27 11:22:32 -04:00
py-autoloaded-pretty-printers-in-newobjfile-event.py
gdb: do autoload before notifying Python side in new_objfile event
2021-04-27 11:22:32 -04:00
py-bad-printers.c
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py-bad-printers.exp
gdb/testsuite: resolve remaining duplicate test names in gdb.python/*.exp
2021-03-12 12:18:34 +00:00
py-bad-printers.py
gdb: re-format Python files using black 21.4b0
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py-block.c
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py-block.exp
gdb/testsuite: make test names unique in gdb.python/py-block.exp
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py-breakpoint-create-fail.c
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py-breakpoint-create-fail.exp
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py-breakpoint-create-fail.py
gdb: re-format Python files using black 21.4b0
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py-breakpoint.c
gdb/python: allow for catchpoint type breakpoints in python
2021-06-25 18:22:07 +01:00
py-breakpoint.exp
gdb/python: allow for catchpoint type breakpoints in python
2021-06-25 18:22:07 +01:00
py-caller-is.c
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py-caller-is.exp
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py-cmd.c
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py-cmd.exp
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py-completion.exp
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py-completion.py
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py-error.exp
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py-error.py
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py-events-shlib.c
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py-events.c
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py-events.exp
gdb: fix eval.c assert during inferior exit event
2021-06-03 21:22:08 +01:00
py-events.py
gdb: fix eval.c assert during inferior exit event
2021-06-03 21:22:08 +01:00
py-evsignal.exp
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py-evthreads.c
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py-evthreads.exp
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py-explore-cc.exp
gdb/testsuite: make test names unique in gdb.python/py-explore-cc.exp
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py-explore.c
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py-explore.cc
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py-explore.exp
gdb/testsuite: make test names unique in gdb.python/py-explore.exp
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py-finish-breakpoint2.cc
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py-finish-breakpoint2.exp
gdb/testsuite: resolve remaining duplicate test names in gdb.python/*.exp
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py-finish-breakpoint2.py
gdb: re-format Python files using black 21.4b0
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py-finish-breakpoint.c
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py-finish-breakpoint.exp
gdb/testsuite: make test names unique in gdb.python/py-finish-breakpoint.exp
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py-finish-breakpoint.py
gdb: re-format Python files using black 21.4b0
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py-format-string.c
gdb: fix pretty printing max depth behaviour
2021-05-14 06:51:21 +01:00
py-format-string.exp
gdb: fix pretty printing max depth behaviour
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py-format-string.py
gdb: re-format Python files using black 21.4b0
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py-frame-args.c
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py-frame-args.exp
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py-frame-args.py
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2021-06-08 23:49:05 +01:00
py-frame-inline.c
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py-frame-inline.exp
gdb/testsuite: resolve remaining duplicate test names in gdb.python/*.exp
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py-frame.c
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py-frame.exp
gdb/python: add PendingFrame.level and Frame.level methods
2021-06-21 16:20:08 +01:00
py-framefilter-addr.c
gdb/python: fix FrameDecorator regression on Python 2
2021-03-16 09:31:56 +00:00
py-framefilter-addr.exp
gdb/python: fix FrameDecorator regression on Python 2
2021-03-16 09:31:56 +00:00
py-framefilter-addr.py
gdb: re-format Python files using black 21.4b0
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py-framefilter-gdb.py
gdb/testsuite: rename .py.in files to .py
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py-framefilter-invalidarg-gdb.py
gdb/testsuite: rename .py.in files to .py
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py-framefilter-invalidarg.exp
gdb/testsuite: rename .py.in files to .py
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py-framefilter-invalidarg.py
Use is/is not to check for None in python code.
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py-framefilter-mi.c
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py-framefilter-mi.exp
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py-framefilter.c
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py-framefilter.exp
gdb/testsuite: rename .py.in files to .py
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py-framefilter.py
Use is/is not to check for None in python code.
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py-function.exp
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py-inferior.c
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py-inferior.exp
gdb/python: add a 'connection_num' attribute to Inferior objects
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py-infthread.c
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py-infthread.exp
gdb/testsuite: resolve remaining duplicate test names in gdb.python/*.exp
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py-lazy-string.c
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py-lazy-string.exp
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py-linetable.c
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py-linetable.exp
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py-linetable.S
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py-lookup-type.exp
gdb/testsuite: remove a duplicate test
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py-mi-events-gdb.py
gdb: re-format Python files using black 21.4b0
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py-mi-events.c
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py-mi-events.exp
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py-mi-objfile-gdb.py
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py-mi-objfile.c
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py-mi-objfile.exp
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py-mi-var-info-path-expression.c
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py-mi-var-info-path-expression.exp
Avoid crash in varobj deletion
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py-mi-var-info-path-expression.py
gdb: re-format Python files using black 21.4b0
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py-mi.exp
gdb/testsuite: make test names unique in gdb.python/py-mi.exp
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py-nested-maps.c
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py-nested-maps.exp
gdb: fix pretty printing max depth behaviour
2021-05-14 06:51:21 +01:00
py-nested-maps.py
Use is/is not to check for None in python code.
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py-objfile-script-gdb.py
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py-objfile-script.c
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py-objfile-script.exp
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py-objfile.c
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py-objfile.exp
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py-parameter.exp
gdb/testsuite: don't include paths in test names
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py-pending-frame-level.c
gdb/python: add PendingFrame.level and Frame.level methods
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py-pending-frame-level.exp
gdb/python: add PendingFrame.level and Frame.level methods
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py-pending-frame-level.py
gdb/python: add PendingFrame.level and Frame.level methods
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py-pp-integral.c
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py-pp-integral.exp
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py-pp-integral.py
gdb: re-format Python files using black 21.4b0
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py-pp-maint.c
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py-pp-maint.exp
gdb/testsuite: make test names unique in gdb.python/py-pp-maint.exp
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py-pp-maint.py
gdb: re-format Python files using black 21.4b0
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py-pp-re-notag.c
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py-pp-re-notag.exp
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py-pp-re-notag.py
gdb: re-format Python files using black 21.4b0
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py-pp-registration.c
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py-pp-registration.exp
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py-pp-registration.py
gdb: re-format Python files using black 21.4b0
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py-prettyprint.c
gdb/testsuite: more testing of pretty printer 'array' display_hint
2021-03-26 17:43:14 +00:00
py-prettyprint.exp
gdb: re-format Python files using black 21.4b0
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py-prettyprint.py
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py-progspace.c
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py-progspace.exp
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py-prompt.c
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py-prompt.exp
gdb/testsuite: make test names unique in gdb.python/py-prompt.exp
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py-rbreak-func2.c
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py-rbreak.c
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py-rbreak.exp
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py-record-btrace-threads.c
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py-record-btrace-threads.exp
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py-record-btrace.c
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py-record-btrace.exp
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py-record-full.c
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py-record-full.exp
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py-recurse-unwind.c
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py-recurse-unwind.exp
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py-recurse-unwind.py
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py-rvalue-ref-value-cc.cc
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py-rvalue-ref-value-cc.exp
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py-section-script.c
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py-section-script.exp
gdb: Remove arm-symbianelf support
2021-02-11 07:23:42 +10:30
py-section-script.py
Use is/is not to check for None in python code.
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py-shared-sl.c
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py-shared.c
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py-shared.exp
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py-startup-opt.exp
gdb/testsuite: update expected results in gdb.python/py-startup-opt.exp
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py-strfns.c
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py-strfns.exp
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py-symbol-2.c
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py-symbol.c
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py-symbol.exp
Fix symbol constants tests for Python 3
2021-06-05 14:46:30 +02:00
py-symtab.exp
gdb/testsuite: make test names unique in gdb.python/py-symtab.exp
2021-03-12 12:18:33 +00:00
py-sync-interp.c
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py-sync-interp.exp
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py-template.cc
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py-template.exp
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py-thrhandle.c
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py-thrhandle.exp
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py-type.c
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py-type.exp
gdb: update Type.fields doc based on actual GDB behavior
2021-05-04 22:19:05 -04:00
py-typeprint.cc
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py-typeprint.exp
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py-typeprint.py
gdb: re-format Python files using black 21.4b0
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py-unwind-inline.c
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py-unwind-inline.exp
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py-unwind-inline.py
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2021-06-08 23:49:05 +01:00
py-unwind-maint.c
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py-unwind-maint.exp
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py-unwind-maint.py
gdb: re-format Python files using black 21.4b0
2021-05-07 10:56:20 -04:00
py-unwind-user-regs.c
gdb/python: handle saving user registers in a frame unwinder
2021-06-21 16:09:05 +01:00
py-unwind-user-regs.exp
gdb/python: handle saving user registers in a frame unwinder
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py-unwind-user-regs.py
gdb/python: handle saving user registers in a frame unwinder
2021-06-21 16:09:05 +01:00
py-unwind.c
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py-unwind.exp
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py-unwind.py
gdb: re-format Python files using black 21.4b0
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py-value-cc.cc
Update copyright year range in all GDB files
2021-01-01 12:12:21 +04:00
py-value-cc.exp
gdb/testsuite: remove duplicate test from gdb.python/py-value-cc.exp
2021-03-12 12:18:34 +00:00
py-value.c
Update copyright year range in all GDB files
2021-01-01 12:12:21 +04:00
py-value.exp
Update copyright year range in all GDB files
2021-01-01 12:12:21 +04:00
py-xmethods.cc
Update copyright year range in all GDB files
2021-01-01 12:12:21 +04:00
py-xmethods.exp
Update copyright year range in all GDB files
2021-01-01 12:12:21 +04:00
py-xmethods.py
gdb: re-format Python files using black 21.4b0
2021-05-07 10:56:20 -04:00
python-1.c
Update copyright year range in all GDB files
2021-01-01 12:12:21 +04:00
python.c
Update copyright year range in all GDB files
2021-01-01 12:12:21 +04:00
python.exp
Use is/is not to check for None in python code.
2021-06-08 23:49:05 +01:00
source1
Update copyright year range in all GDB files
2021-01-01 12:12:21 +04:00
source2.py
gdb: re-format Python files using black 21.4b0
2021-05-07 10:56:20 -04:00
tui-window-disabled.c
gdb: return true in TuiWindow.is_valid only if TUI is enabled
2021-02-08 11:56:16 +00:00
tui-window-disabled.exp
gdb: return true in TuiWindow.is_valid only if TUI is enabled
2021-02-08 11:56:16 +00:00
tui-window-disabled.py
gdb: re-format Python files using black 21.4b0
2021-05-07 10:56:20 -04:00
tui-window.exp
gdb/python: don't allow the user to delete window title attributes
2021-02-08 11:55:05 +00:00
tui-window.py
gdb: re-format Python files using black 21.4b0
2021-05-07 10:56:20 -04:00