From 4ffbba72f39aa4a8c6833618b9fd552df33ca69a Mon Sep 17 00:00:00 2001 From: Doug Evans Date: Fri, 17 Oct 2014 11:12:17 -0700 Subject: New python event "clear_objfiles". If one is watching new_objfile events in python, it helps to know when the list of objfiles is cleared. This patch adds a new clear_objfiles event to support this. This patch is all just cut-n-paste-n-tweak derived from the new_objfiles event. gdb/ChangeLog: * NEWS: Mention new event gdb.clear_objfiles. * python/py-event.h (emit_clear_objfiles_event): Clear * python/py-events.h (events_object): New member clear_objfiles. * python/py-evts.c (gdbpy_initialize_py_events): Add clear_objfiles event. * python/py-inferior.c (python_new_objfile): If objfile is NULL, emit clear_objfiles event. * python/py-newobjfileevent.c (create_clear_objfiles_event_object): New function. (emit_clear_objfiles_event): New function. (clear_objfiles): New event. * python/python-internal.h (gdbpy_initialize_clear_objfiles_event): Declare. * python/python.c (_initialize_python): Call gdbpy_initialize_clear_objfiles_event. gdb/doc/ChangeLog: * python.texi (Events In Python): Document clear_objfiles event. gdb/testsuite/ChangeLog: * gdb.python/py-events.exp: Update expected output for clear_objfiles event. * gdb.python/py-events.py: Add clear_objfiles event. --- gdb/python/py-event.h | 1 + gdb/python/py-events.h | 1 + gdb/python/py-evts.c | 3 +++ gdb/python/py-inferior.c | 23 +++++++++++------ gdb/python/py-newobjfileevent.c | 55 +++++++++++++++++++++++++++++++++++++++++ gdb/python/python-internal.h | 2 ++ gdb/python/python.c | 1 + 7 files changed, 79 insertions(+), 7 deletions(-) (limited to 'gdb/python') diff --git a/gdb/python/py-event.h b/gdb/python/py-event.h index 5a0f29b..c0bd9a6 100644 --- a/gdb/python/py-event.h +++ b/gdb/python/py-event.h @@ -112,6 +112,7 @@ extern int evpy_emit_event (PyObject *event, extern PyObject *create_event_object (PyTypeObject *py_type); extern PyObject *create_thread_event_object (PyTypeObject *py_type); extern int emit_new_objfile_event (struct objfile *objfile); +extern int emit_clear_objfiles_event (void); extern void evpy_dealloc (PyObject *self); extern int evpy_add_attribute (PyObject *event, diff --git a/gdb/python/py-events.h b/gdb/python/py-events.h index 3431612..0b5656b 100644 --- a/gdb/python/py-events.h +++ b/gdb/python/py-events.h @@ -46,6 +46,7 @@ typedef struct eventregistry_object *cont; eventregistry_object *exited; eventregistry_object *new_objfile; + eventregistry_object *clear_objfiles; PyObject *module; diff --git a/gdb/python/py-evts.c b/gdb/python/py-evts.c index a7daf8a..d08b14b 100644 --- a/gdb/python/py-evts.c +++ b/gdb/python/py-evts.c @@ -76,6 +76,9 @@ gdbpy_initialize_py_events (void) if (add_new_registry (&gdb_py_events.new_objfile, "new_objfile") < 0) return -1; + if (add_new_registry (&gdb_py_events.clear_objfiles, "clear_objfiles") < 0) + return -1; + if (gdb_pymodule_addobject (gdb_module, "events", (PyObject *) gdb_py_events.module) < 0) diff --git a/gdb/python/py-inferior.c b/gdb/python/py-inferior.c index 181059a..1b38d55 100644 --- a/gdb/python/py-inferior.c +++ b/gdb/python/py-inferior.c @@ -137,23 +137,32 @@ python_inferior_exit (struct inferior *inf) } /* Callback used to notify Python listeners about new objfiles loaded in the - inferior. */ + inferior. OBJFILE may be NULL which means that the objfile list has been + cleared (emptied). */ static void python_new_objfile (struct objfile *objfile) { struct cleanup *cleanup; - if (objfile == NULL) - return; - if (!gdb_python_initialized) return; - cleanup = ensure_python_env (get_objfile_arch (objfile), current_language); + cleanup = ensure_python_env (objfile != NULL + ? get_objfile_arch (objfile) + : target_gdbarch (), + current_language); - if (emit_new_objfile_event (objfile) < 0) - gdbpy_print_stack (); + if (objfile == NULL) + { + if (emit_clear_objfiles_event () < 0) + gdbpy_print_stack (); + } + else + { + if (emit_new_objfile_event (objfile) < 0) + gdbpy_print_stack (); + } do_cleanups (cleanup); } diff --git a/gdb/python/py-newobjfileevent.c b/gdb/python/py-newobjfileevent.c index e4e1351..104ed07 100644 --- a/gdb/python/py-newobjfileevent.c +++ b/gdb/python/py-newobjfileevent.c @@ -22,6 +22,8 @@ static PyTypeObject new_objfile_event_object_type CPYCHECKER_TYPE_OBJECT_FOR_TYPEDEF ("event_object"); +static PyTypeObject clear_objfiles_event_object_type + CPYCHECKER_TYPE_OBJECT_FOR_TYPEDEF ("event_object"); static PyObject * create_new_objfile_event_object (struct objfile *objfile) @@ -72,3 +74,56 @@ GDBPY_NEW_EVENT_TYPE (new_objfile, "GDB new object file event object", event_object_type, static); + +/* Subroutine of emit_clear_objfiles_event to simplify it. */ + +static PyObject * +create_clear_objfiles_event_object (void) +{ + PyObject *objfile_event; + PyObject *py_progspace; + + objfile_event = create_event_object (&clear_objfiles_event_object_type); + if (!objfile_event) + goto fail; + + /* Note that pspace_to_pspace_object returns a borrowed reference, + so we don't need a decref here. */ + py_progspace = pspace_to_pspace_object (current_program_space); + if (!py_progspace || evpy_add_attribute (objfile_event, + "progspace", + py_progspace) < 0) + goto fail; + + return objfile_event; + + fail: + Py_XDECREF (objfile_event); + return NULL; +} + +/* Callback function which notifies observers when the "clear objfiles" + event occurs. + This function will create a new Python clear_objfiles event object. + Return -1 if emit fails. */ + +int +emit_clear_objfiles_event (void) +{ + PyObject *event; + + if (evregpy_no_listeners_p (gdb_py_events.clear_objfiles)) + return 0; + + event = create_clear_objfiles_event_object (); + if (event) + return evpy_emit_event (event, gdb_py_events.clear_objfiles); + return -1; +} + +GDBPY_NEW_EVENT_TYPE (clear_objfiles, + "gdb.ClearObjFilesEvent", + "ClearObjFilesEvent", + "GDB clear object files event object", + event_object_type, + static); diff --git a/gdb/python/python-internal.h b/gdb/python/python-internal.h index c262a46..54eebeb 100644 --- a/gdb/python/python-internal.h +++ b/gdb/python/python-internal.h @@ -470,6 +470,8 @@ int gdbpy_initialize_thread_event (void) CPYCHECKER_NEGATIVE_RESULT_SETS_EXCEPTION; int gdbpy_initialize_new_objfile_event (void) CPYCHECKER_NEGATIVE_RESULT_SETS_EXCEPTION; +int gdbpy_initialize_clear_objfiles_event (void) + CPYCHECKER_NEGATIVE_RESULT_SETS_EXCEPTION; int gdbpy_initialize_arch (void) CPYCHECKER_NEGATIVE_RESULT_SETS_EXCEPTION; int gdbpy_initialize_xmethods (void) diff --git a/gdb/python/python.c b/gdb/python/python.c index af90bef..ca531e2 100644 --- a/gdb/python/python.c +++ b/gdb/python/python.c @@ -1756,6 +1756,7 @@ message == an error message without a stack will be printed."), || gdbpy_initialize_exited_event () < 0 || gdbpy_initialize_thread_event () < 0 || gdbpy_initialize_new_objfile_event () < 0 + || gdbpy_initialize_clear_objfiles_event () < 0 || gdbpy_initialize_arch () < 0 || gdbpy_initialize_xmethods () < 0) goto fail; -- cgit v1.1