gdb/python: new Progspace.symbol_file attribute

Add a new Progspace.symbol_file attribute.  This attribute holds the
gdb.Objfile object that corresponds to Progspace.filename, or None if
there is no main symbol file currently set.

Currently, to get this gdb.Objfile, a user would need to use
Progspace.objfiles, and then search for the objfile with a name that
matches Progspace.filename -- which should work just fine, but having
direct access seems a little nicer.

Reviewed-By: Eli Zaretskii <eliz@gnu.org>
Approved-By: Tom Tromey <tom@tromey.com>

gdb/NEWS

@@ -298,6 +298,11 @@ show tui mouse-events
      class, it signals to gdb that the printer may implement new
      pretty-printer methods.
 
+  ** New attribute Progspace.symbol_file.  This attribute holds the
+     gdb.Objfile that corresponds to Progspace.filename (when
+     Progspace.filename is not None), otherwise, this attribute is
+     itself None.
+
 *** Changes in GDB 13
 
 * MI version 1 is deprecated, and will be removed in GDB 14.

gdb/doc/python.texi

@@ -5078,6 +5078,23 @@ If there is no main symbol table currently loaded, then this attribute
 will be @code{None}.
 @end defvar
 
+@defvar Progspace.symbol_file
+The @code{gdb.Objfile} representing the main symbol file (from which
+debug symbols have been loaded) for the @code{gdb.Progspace}.  This is
+the symbol file set by the @kbd{symbol-file} or @kbd{file} commands.
+
+This will be the @code{gdb.Objfile} representing
+@code{Progspace.filename} when @code{Progspace.filename} is not
+@code{None}.
+
+If there is no main symbol table currently loaded, then this attribute
+will be @code{None}.
+
+If the @code{Progspace} is invalid, i.e.@:, when
+@code{Progspace.is_valid()} returns @code{False}, then attempting to
+access this attribute will raise a @code{RuntimeError} exception.
+@end defvar
+
 @defvar Progspace.pretty_printers
 The @code{pretty_printers} attribute is a list of functions.  It is
 used to look up pretty-printers.  A @code{Value} is passed to each

gdb/python/py-progspace.c

@@ -111,6 +111,26 @@ pspy_get_filename (PyObject *self, void *closure)
   Py_RETURN_NONE;
 }
 
+/* Implement the gdb.Progspace.symbol_file attribute.  Retun the
+   gdb.Objfile corresponding to the currently loaded symbol-file, or None
+   if no symbol-file is loaded.  If the Progspace is invalid then raise an
+   exception.  */
+
+static PyObject *
+pspy_get_symbol_file (PyObject *self, void *closure)
+{
+  pspace_object *obj = (pspace_object *) self;
+
+  PSPY_REQUIRE_VALID (obj);
+
+  struct objfile *objfile = obj->pspace->symfile_object_file;
+
+  if (objfile != nullptr)
+    return objfile_to_objfile_object (objfile).release ();
+
+  Py_RETURN_NONE;
+}
+
 static void
 pspy_dealloc (PyObject *self)
 {
@@ -573,6 +593,9 @@ static gdb_PyGetSetDef pspace_getset[] =
     "The __dict__ for this progspace.", &pspace_object_type },
   { "filename", pspy_get_filename, NULL,
     "The filename of the progspace's main symbol file, or None.", nullptr },
+  { "symbol_file", pspy_get_symbol_file, nullptr,
+    "The gdb.Objfile for the progspace's main symbol file, or None.",
+    nullptr},
   { "pretty_printers", pspy_get_printers, pspy_set_printers,
     "Pretty printers.", NULL },
   { "frame_filters", pspy_get_frame_filters, pspy_set_frame_filters,

gdb/testsuite/gdb.python/py-progspace.exp

@@ -30,6 +30,8 @@ clean_restart
 
 gdb_test "python print (gdb.current_progspace().filename)" "None" \
   "current progspace filename (None)"
+gdb_test "python print (gdb.current_progspace().symbol_file)" "None" \
+    "current progspace symbol_file is None"
 gdb_test "python print (gdb.progspaces())" "\\\[<gdb.Progspace object at $hex>\\\]"
 
 gdb_test_no_output "python dir(gdb.current_progspace())"
@@ -42,6 +44,10 @@ gdb_py_test_silent_cmd "python progspace = gdb.current_progspace()" \
 gdb_test "python print (progspace.filename)" "py-progspace" \
   "current progspace filename (py-progspace)"
 
+gdb_test "python print (gdb.current_progspace().symbol_file)" \
+    "<gdb.Objfile filename=.*/py-progspace>" \
+    "current progspace symbol_file is set correctly"
+
 gdb_py_test_silent_cmd "python progspace.random_attribute = 42" \
     "Set random attribute in progspace" 1
 gdb_test "python print (progspace.random_attribute)" "42" \
@@ -100,3 +106,6 @@ gdb_test "inferior 1" "Switching to inferior 1.*"
 gdb_test_no_output "remove-inferiors 2"
 gdb_test "python print (progspace2.objfiles ())" \
     "RuntimeError: Program space no longer exists.*"
+
+gdb_test "python print (progspace2.symbol_file)" \
+    "RuntimeError: Program space no longer exists.*"