gdb pretty printer

[bas524]

for debugging optional-lite I propose this pretty printer

class NonStdOptionalPrinter(SingleObjContainerPrinter):
    "Print a nonstd::optional"

    def __init__ (self, typename, val):
        alternatives = get_template_arg_list(val.type)
        valtype = self._recognize (val.type.template_argument(0))
        self.typename = strip_versioned_namespace(typename)
        self.typename = re.sub('^nonstd::(optional_lite::|)(optional::|)(.*)', 
                                              r'nonstd::\1\3<%s>' % valtype, 
                                              self.typename, 1)
        self.val = val
        self.contained_type = alternatives[0]
        addr = val['contained']['data']['__data'].address
        contained_value = addr.cast(self.contained_type.pointer()).dereference()
        visualizer = gdb.default_visualizer (contained_value)
        super (NonStdOptionalPrinter, self).__init__ (contained_value, visualizer)

    def to_string (self):
        if self.contained_value is None:
            return "%s [no contained value]" % self.typename
        if self.visualizer:
            return "%s containing %s" % (self.typename,
                                         self.visualizer.to_string())
        return self.typename

And don't forget add printer with this code

libstdcxx_printer.add_version('nonstd::optional_lite::',
                                  'optional', NonStdOptionalPrinter)

[martinmoene]

NTS (notes to self):

• Gdb pretty printing
• GDB Pretty Printers for Boost
• Also add optional-lite.natvis (Visual Studio IDE)?

[bas524]

Excuse me, but I don't understand, what did you mean? I wrote this printer guided by the rules from gdb. May be you can add this printer as link to readme.md?

[martinmoene]

NTS: note to self.

• I'm not familiar with gdb pretty printing
• I've to decide what to do with your proposal (thanks) as it doesn't (didn't) give an indication for that

Plan:

• [x] add extra/gdb/nonstd_optional_printer.py
• [ ] refer to the printer from Readme.md (thinking...)

[enriqueiglesias]

I don't understand, what did you mean? I wrote this printer guided by the rules from gdb. May be you can add this printer as link to readme.md? and for the help regarding the printer you can visit the httpst://printertechsupportnumbers.com/blog/how-to-fix-epson-error-code-0xea/ and get the instant help.

[martinmoene]

@enriqueiglesias How would your remark be of help to me?

[bas524]

@enriqueiglesias How would your remark be of help to me?

I think this is a bot

[martinmoene]

@bas524 it's being bot (rude) in the Dutch sense anyway ;)