Re: [PATCH 2/2] libstdc++: _versioned_namespace is always non-None

[Jonathan Wakely <jwakely.gcc@gmail.com>]

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On Tue, 3 Oct 2023, 23:55 Jonathan Wakely, <jwakely.gcc@gmail.com> wrote:

>
>
> On Tue, 3 Oct 2023, 19:27 Tom Tromey, <tromey@adacore.com> wrote:
>
>> Some code in the pretty-printers seems to assume that the
>> _versioned_namespace global might be None (or the empty string).
>> However, doesn't occur, as the variable is never reassigned.
>>
>
> ok for trunk, but we should just remove that bit from xmethods.py as the
> variable is never even set in that file.
>

Oh I see you already addressed that in another patch :-)


>
>
>> libstdc++-v3/ChangeLog:
>>
>>         * python/libstdcxx/v6/printers.py: Assume that
>>         _versioned_namespace is non-None.
>>         * python/libstdcxx/v6/xmethods.py (is_specialization_of):
>>         Assume that _versioned_namespace is non-None.
>> ---
>>  libstdc++-v3/python/libstdcxx/v6/printers.py | 15 ++++++---------
>>  libstdc++-v3/python/libstdcxx/v6/xmethods.py |  3 +--
>>  2 files changed, 7 insertions(+), 11 deletions(-)
>>
>> diff --git a/libstdc++-v3/python/libstdcxx/v6/printers.py
>> b/libstdc++-v3/python/libstdcxx/v6/printers.py
>> index 23efbd171ec..e370551cbe1 100644
>> --- a/libstdc++-v3/python/libstdcxx/v6/printers.py
>> +++ b/libstdc++-v3/python/libstdcxx/v6/printers.py
>> @@ -139,7 +139,7 @@ def lookup_templ_spec(templ, *args):
>>      except gdb.error as e:
>>          # Type not found, try again in versioned namespace.
>>          global _versioned_namespace
>> -        if _versioned_namespace and _versioned_namespace not in templ:
>> +        if _versioned_namespace not in templ:
>>              t = t.replace('::', '::' + _versioned_namespace, 1)
>>              try:
>>                  return gdb.lookup_type(t)
>> @@ -211,16 +211,13 @@ def is_specialization_of(x, template_name):
>>      global _versioned_namespace
>>      if isinstance(x, gdb.Type):
>>          x = x.tag
>> -    if _versioned_namespace:
>> -        template_name = '(%s)?%s' % (_versioned_namespace, template_name)
>> +    template_name = '(%s)?%s' % (_versioned_namespace, template_name)
>>      return re.match('^std::%s<.*>$' % template_name, x) is not None
>>
>>
>>  def strip_versioned_namespace(typename):
>>      global _versioned_namespace
>> -    if _versioned_namespace:
>> -        return typename.replace(_versioned_namespace, '')
>> -    return typename
>> +    return typename.replace(_versioned_namespace, '')
>>
>>
>>  def strip_inline_namespaces(type_str):
>> @@ -2355,7 +2352,7 @@ class Printer(object):
>>      # Add a name using _GLIBCXX_BEGIN_NAMESPACE_VERSION.
>>      def add_version(self, base, name, function):
>>          self.add(base + name, function)
>> -        if _versioned_namespace and '__cxx11' not in base:
>> +        if '__cxx11' not in base:
>>              vbase = re.sub('^(std|__gnu_cxx)::', r'\g<0>%s' %
>>                             _versioned_namespace, base)
>>              self.add(vbase + name, function)
>> @@ -2527,7 +2524,7 @@ def add_one_template_type_printer(obj, name,
>> defargs):
>>      printer = TemplateTypePrinter('std::__debug::' + name, defargs)
>>      gdb.types.register_type_printer(obj, printer)
>>
>> -    if _versioned_namespace and '__cxx11' not in name:
>> +    if '__cxx11' not in name:
>>          # Add second type printer for same type in versioned namespace:
>>          ns = 'std::' + _versioned_namespace
>>          # PR 86112 Cannot use dict comprehension here:
>> @@ -2628,7 +2625,7 @@ class FilteringTypePrinter(object):
>>  def add_one_type_printer(obj, template, name, targ1=None):
>>      printer = FilteringTypePrinter('std::' + template, 'std::' + name,
>> targ1)
>>      gdb.types.register_type_printer(obj, printer)
>> -    if _versioned_namespace and '__cxx11' not in template:
>> +    if '__cxx11' not in template:
>>          ns = 'std::' + _versioned_namespace
>>          printer = FilteringTypePrinter(ns + template, ns + name, targ1)
>>          gdb.types.register_type_printer(obj, printer)
>> diff --git a/libstdc++-v3/python/libstdcxx/v6/xmethods.py
>> b/libstdc++-v3/python/libstdcxx/v6/xmethods.py
>> index 8ccf57c4d6b..42e60eb57b1 100644
>> --- a/libstdc++-v3/python/libstdcxx/v6/xmethods.py
>> +++ b/libstdc++-v3/python/libstdcxx/v6/xmethods.py
>> @@ -39,8 +39,7 @@ def is_specialization_of(x, template_name):
>>      """
>>      if isinstance(x, gdb.Type):
>>          x = x.tag
>> -    if _versioned_namespace:
>> -        template_name = '(%s)?%s' % (_versioned_namespace, template_name)
>> +    template_name = '(%s)?%s' % (_versioned_namespace, template_name)
>>      return re.match(r'^std::(__\d::)?%s<.*>$' % template_name, x) is not
>> None
>>
>>  class LibStdCxxXMethod(gdb.xmethod.XMethod):
>> --
>> 2.40.1
>>
>>