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PR python/13598 - add before_prompt event

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This adds an event that is emitted just before GDB presents a prompt
to the user.  This provides Python code a way to react to whatever
changes might have been made by the previous command.  For example, in
my GUI I use this to track changes to the selected frame and reflect
them in the UI.

Built and regtested on x86-64 Fedora 23.

gdb/ChangeLog
2017-02-14  Tom Tromey  <tom@tromey.com>

	PR python/13598:
	* python/python.c (gdbpy_before_prompt_hook): Emit before_prompt
	event.
	* python/py-evts.c (gdbpy_initialize_py_events): Add
	before_prompt registry.
	* python/py-events.h (events_object) <before_prompt>: New field.

gdb/doc/ChangeLog
2017-02-14  Tom Tromey  <tom@tromey.com>

	PR python/13598:
	* python.texi (Events In Python): Document events.before_prompt.

gdb/testsuite/ChangeLog
2017-02-14  Tom Tromey  <tom@tromey.com>

	PR python/13598:
	* gdb.python/py-events.exp: Add before_prompt event tests.
This commit is contained in:
Tom Tromey 2015-04-29 09:44:24 -06:00
parent 075beec08a
commit 3f77c7691f
8 changed files with 57 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

1
gdb/python/py-events.h
View file

@ -53,6 +53,7 @@ typedef struct
eventregistry_object *breakpoint_created;
eventregistry_object *breakpoint_deleted;
eventregistry_object *breakpoint_modified;
eventregistry_object *before_prompt;
PyObject *module;

3
gdb/python/py-evts.c
View file

@ -100,6 +100,9 @@ gdbpy_initialize_py_events (void)
"breakpoint_modified") < 0)
return -1;
if (add_new_registry (&gdb_py_events.before_prompt, "before_prompt") < 0)
return -1;
if (gdb_pymodule_addobject (gdb_module,
"events",
(PyObject *) gdb_py_events.module) < 0)

5
gdb/python/python.c
View file

@ -100,6 +100,7 @@ const struct extension_language_defn extension_language_python =
#include "interps.h"
#include "event-top.h"
#include "py-ref.h"
#include "py-event.h"
/* True if Python has been successfully initialized, false
otherwise. */
@ -969,6 +970,10 @@ gdbpy_before_prompt_hook (const struct extension_language_defn *extlang,
gdbpy_enter enter_py (get_current_arch (), current_language);
if (!evregpy_no_listeners_p (gdb_py_events.before_prompt)
&& evpy_emit_event (NULL, gdb_py_events.before_prompt) < 0)
return EXT_LANG_RC_ERROR;
if (gdb_python_module
&& PyObject_HasAttrString (gdb_python_module, "prompt_hook"))
{