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Add new_inferior, inferior_deleted, and new_thread events

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This adds a few new events to gdb's Python layer: new_inferior,
inferior_deleted, and new_thread.  I wanted to be able to add a
combined inferior/thread display window to my GUI, and I needed a few
events to make this work.  This is PR python/15622.

ChangeLog
2017-09-11  Tom Tromey  <tom@tromey.com>

	PR python/15622:
	* NEWS: Add entry.
	* python/python.c (do_start_initialization): Initialize new event
	types.
	* python/python-internal.h (gdbpy_initialize_new_inferior_event)
	(gdbpy_initialize_inferior_deleted_event)
	(gdbpy_initialize_new_thread_event): Declare.
	* python/py-threadevent.c (create_thread_event_object): Add option
	"thread" parameter.
	* python/py-inferior.c (new_thread_event_object_type)
	(new_inferior_event_object_type)
	(inferior_deleted_event_object_type): Declare.
	(python_new_inferior, python_inferior_deleted): New functions.
	(add_thread_object): Emit new_thread event.
	(gdbpy_initialize_inferior): Attach new functions to corresponding
	observers.
	(new_thread, new_inferior, inferior_deleted): Define new event
	types.
	* python/py-evts.c (gdbpy_initialize_py_events): Add new
	registries.
	* python/py-events.h (events_object) <new_inferior,
	inferior_deleted, new_thread>: New fields.
	* python/py-event.h (create_thread_event_breakpoint): Add optional
	"thread" parameter.

doc/ChangeLog
2017-09-11  Tom Tromey  <tom@tromey.com>

	* python.texi (Events In Python): Document new events.

testsuite/ChangeLog
2017-09-11  Tom Tromey  <tom@tromey.com>

	* gdb.python/py-infthread.exp: Add tests for new_thread event.
	* gdb.python/py-inferior.exp: Add tests for new inferior events.
This commit is contained in:
Tom Tromey 2017-09-05 12:07:00 -06:00
parent 4ec521f238
commit 7c96f8c1da
14 changed files with 229 additions and 7 deletions
Download patch file Download diff file Expand all files Collapse all files

88
gdb/python/py-inferior.c
View file

@ -30,6 +30,13 @@
#include "py-event.h"
#include "py-stopevent.h"
extern PyTypeObject new_thread_event_object_type
CPYCHECKER_TYPE_OBJECT_FOR_TYPEDEF ("event_object");
extern PyTypeObject new_inferior_event_object_type
CPYCHECKER_TYPE_OBJECT_FOR_TYPEDEF ("event_object");
extern PyTypeObject inferior_deleted_event_object_type
CPYCHECKER_TYPE_OBJECT_FOR_TYPEDEF ("event_object");
struct threadlist_entry {
thread_object *thread_obj;
struct threadlist_entry *next;
@ -235,6 +242,60 @@ inferior_to_inferior_object (struct inferior *inferior)
return (PyObject *) inf_obj;
}
/* Called when a new inferior is created. Notifies any Python event
listeners. */
static void
python_new_inferior (struct inferior *inf)
{
if (!gdb_python_initialized)
return;
gdbpy_enter enter_py (python_gdbarch, python_language);
if (evregpy_no_listeners_p (gdb_py_events.new_inferior))
return;
gdbpy_ref<> inf_obj (inferior_to_inferior_object (inf));
if (inf_obj == NULL)
{
gdbpy_print_stack ();
return;
}
gdbpy_ref<> event (create_event_object (&new_inferior_event_object_type));
if (event == NULL
|| evpy_add_attribute (event.get (), "inferior", inf_obj.get ()) < 0
|| evpy_emit_event (event.get (), gdb_py_events.new_inferior) < 0)
gdbpy_print_stack ();
}
/* Called when an inferior is removed. Notifies any Python event
listeners. */
static void
python_inferior_deleted (struct inferior *inf)
{
if (!gdb_python_initialized)
return;
gdbpy_enter enter_py (python_gdbarch, python_language);
if (evregpy_no_listeners_p (gdb_py_events.inferior_deleted))
return;
gdbpy_ref<> inf_obj (inferior_to_inferior_object (inf));
if (inf_obj == NULL)
{
gdbpy_print_stack ();
return;
}
gdbpy_ref<> event (create_event_object (&inferior_deleted_event_object_type));
if (event == NULL
|| evpy_add_attribute (event.get (), "inferior", inf_obj.get ()) < 0
|| evpy_emit_event (event.get (), gdb_py_events.inferior_deleted) < 0)
gdbpy_print_stack ();
}
/* Finds the Python Inferior object for the given PID. Returns a
reference, or NULL if PID does not match any inferior object. */
@ -298,6 +359,15 @@ add_thread_object (struct thread_info *tp)
inf_obj->threads = entry;
inf_obj->nthreads++;
if (evregpy_no_listeners_p (gdb_py_events.new_thread))
return;
gdbpy_ref<> event (create_thread_event_object (&new_thread_event_object_type,
(PyObject *) thread_obj));
if (event == NULL
|| evpy_emit_event (event.get (), gdb_py_events.new_thread) < 0)
gdbpy_print_stack ();
}
static void
@ -823,6 +893,8 @@ gdbpy_initialize_inferior (void)
observer_attach_register_changed (python_on_register_change);
observer_attach_inferior_exit (python_inferior_exit);
observer_attach_new_objfile (python_new_objfile);
observer_attach_inferior_added (python_new_inferior);
observer_attach_inferior_removed (python_inferior_deleted);
membuf_object_type.tp_new = PyType_GenericNew;
if (PyType_Ready (&membuf_object_type) < 0)
@ -970,3 +1042,19 @@ PyTypeObject membuf_object_type = {
0, /* tp_init */
0, /* tp_alloc */
};
GDBPY_NEW_EVENT_TYPE (new_thread,
"gdb.NewThreadEvent",
"NewThreadEvent",
"GDB new thread event object",
thread_event_object_type);
GDBPY_NEW_EVENT_TYPE (new_inferior,
"gdb.NewInferiorEvent",
"NewInferiorEvent",
"GDB new inferior event object",
event_object_type);
GDBPY_NEW_EVENT_TYPE (inferior_deleted,
"gdb.InferiorDeletedEvent",
"InferiorDeletedEvent",
"GDB inferior deleted event object",
event_object_type);