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gdb: Restore selected frame in print_frame_local_vars

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PR gdb/23203 reports 'bt full' causing the currently selected frame to
change, this issue is fixed in this commit.

Add a new class scoped_restore_selected_frame that saves and restores
the selected frame.  Make use of this in print_frame_local_vars to
restore the selected frame on exit.

gdb/ChangeLog:

	PR gdb/23203
	* frame.c
	(scoped_restore_selected_frame::scoped_restore_selected_frame):
	Define.
	(scoped_restore_selected_frame::~scoped_restore_selected_frame):
	Define.
	* frame.h (class scoped_restore_selected_frame): New class.
	* stack.c (print_frame_local_vars): Remove catching and rethrowing
	of any exception, use scoped_restore_selected_frame to restore the
	frame instead.

gdb/testsuite/ChangeLog:

	PR gdb/23203
	* gdb.base/bt-selected-frame.c: New file.
	* gdb.base/bt-selected-frame.exp: New file.
	* lib/gdb.exp (get_current_frame_number): New function.
This commit is contained in:
Andrew Burgess
2018-05-18 17:45:16 +01:00
parent d9f6d7f8b6
commit 45f25d6c83
8 changed files with 182 additions and 20 deletions
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19
gdb/frame.h
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@ -164,6 +164,25 @@ struct frame_id
int artificial_depth;
};
/* Save and restore the currently selected frame. */
class scoped_restore_selected_frame
{
public:
/* Save the currently selected frame. */
scoped_restore_selected_frame ();
/* Restore the currently selected frame. */
~scoped_restore_selected_frame ();
DISABLE_COPY_AND_ASSIGN (scoped_restore_selected_frame);
private:
/* The ID of the previously selected frame. */
struct frame_id m_fid;
};
/* Methods for constructing and comparing Frame IDs. */
/* For convenience. All fields are zero. This means "there is no frame". */