[Bug mi/31324] -var-create: slowdown due to children printing

["dmitry.neverov at jetbrains dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=31324

--- Comment #1 from Dmitry Neverov <dmitry.neverov at jetbrains dot com> ---
To reproduce, one needs to register a pretty-printer for arrays:

class ArrayPrinter(object):
    def __init__(self, val, type):
        self.val = val
        self.type = type

    def display_hint(self):
        return 'array'

    def to_string(self):
        return None

    def children(self):
        return self.Iterator(self.val, self.type)

    class Iterator:
        def __init__(self, val, type):
            self.val = val
            try:
                (start_index, end_index) = type.range()
                self.index = start_index - 1
                self.end_index = end_index + 1
            except:
                self.index = -1
                self.end_index = untypedef(type).sizeof //
untypedef(type).target().sizeof

        def __iter__(self):
            return self

        def __next__(self):
            self.index += 1
            if self.index == self.end_index:
                raise StopIteration
            return ('[{0}]'.format(self.index), self.val[self.index])

        def next(self):
            return self.__next__()

def arrayMatcher(val):
    if val.type.code == gdb.TYPE_CODE_ARRAY:
        return ArrayPrinter(val, type)
    return None

gdb.pretty_printers.append(arrayMatcher)

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