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From: "z49x2vmq at gmail dot com" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug python/27021] Python Exception <class 'AttributeError'>
 'NoneType' object has no attribute 'pointer': when using pretty-printer
Date: Tue, 08 Dec 2020 01:05:06 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D27021

--- Comment #3 from z49x2vmq at gmail dot com ---
In /usr/share/gcc-10/python/libstdcxx/v6/printers.py, StdMapPrinter.__init_=
_()
accepts val, which is type of gdb.Value.=20

When "print foo_map" is executed from c++ frame, val.type is of:=20
    "std::map<int, int, std::less<int>, std::allocator<std::pair<int const,
int> > >"

But when "print foo_map" is executed from c frame, val.type is of:
    "class std::map<int, int, std::less<int>, std::allocator<std::pair<int
const, int> > >"

Substring "class " is probablly causing the problem. And "class " comes from
c-typeprint.c:
> static void
> c_type_print_base_1 (struct type *type, struct ui_file *stream,
> 		     int show, int level,
> 		     enum language language,
> 		     const struct type_print_options *flags,
> 		     struct print_offset_data *podata)
> {
> .
> .
> .
>       if (language =3D=3D language_c || language =3D=3D language_minimal)
> 	{
> 	  if (type->code () =3D=3D TYPE_CODE_UNION)
> 	    fprintf_filtered (stream, "union ");
> 	  else if (type->code () =3D=3D TYPE_CODE_STRUCT)
> 	    {
> 	      if (TYPE_DECLARED_CLASS (type))
> 		fprintf_filtered (stream, "class ");
> ...

Looks like "class " is prepended if "language =3D=3D language_c".=20

I don't know if this should be considered as gdb bug.

Since /usr/share/gcc-10/python/libstdcxx/v6/printers.py belongs to "libstdc=
++"
package(Fedora), you might file a bug in libstdc++.


Quick workaround would be manually removing "class ", "struct ", "union ", =
and
"enum " in printers.py:
[1]=20
# Starting with the type ORIG, search for the member type NAME.  This
# handles searching upward through superclasses.  This is needed to
# work around http://sourceware.org/bugzilla/show_bug.cgi?id=3D13615.
def find_type(orig, name):
    typ =3D orig.strip_typedefs()
    while True:
        # Strip cv-qualifiers.  PR 67440.
        search =3D '%s::%s' % (typ.unqualified(), name)
        search =3D re.sub(r'^(class|struct|enum|union) ', "", search)

[2]
# Starting with the type ORIG, search for the member type NAME.  This
# handles searching upward through superclasses.  This is needed to
# work around http://sourceware.org/bugzilla/show_bug.cgi?id=3D13615.
def find_type(orig, name):
    typ =3D orig.strip_typedefs()
    while True:
        # Strip cv-qualifiers.  PR 67440.
        search =3D '%s::%s' % (typ.unqualified(), name)
        search =3D re.sub(r'^(class|struct|enum|union) ', "", search)

--=20
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