[Bug mi/18282] New: Pretty Printers - prints string value as char[] from children()

["david.docteur at intel dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=18282

            Bug ID: 18282
           Summary: Pretty Printers - prints string value as char[] from
                    children()
           Product: gdb
           Version: 7.3
            Status: NEW
          Severity: normal
          Priority: P2
         Component: mi
          Assignee: unassigned at sourceware dot org
          Reporter: david.docteur at intel dot com

Created attachment 8255
  --> https://sourceware.org/bugzilla/attachment.cgi?id=8255&action=edit
Unable to create variable object issue

Hi guys,

I am using Eclipse Kepler, GDB 7.3.1 and working on a project with pretty
printers (Python 2.7).

The problem is that I am trying to display a "prettyfied" object having
children and the string type is displayed as characters array.
Types such as int or long are displayed properly.
Those children are obtained from a Python list object such as follow:



class TestPrinter:
    "Print a test printer"

    def __init__(self, val):
        self.val = val

    def to_string(self):
        return "map"

    def children(self):

        streetno = {"1":"testing", "2":"Dravid", "3":"Sehwag", 
                    "4":"Laxman","5":"Kohli"}

        for field in sorted(streetno.keys()):
            if field is not None:
                yield field, str(streetno[field])


def str_lookup_function(val):
       lookup_tag = val.type.tag
       if lookup_tag == None:
           return None
       regex = re.compile("^test$")
       if regex.match(lookup_tag):
         return TestPrinter(val)


If I return a simple string from to_string() (without calling the children()
function) then it works well, and displayed as a string within Eclipse in the
"Value" column.

But in this case, the children of my object are displayed as char[].
I can expand the content of each, which displays character by character and its
ASCII value. Then, once I click on the child itself I get the following error:

1    char [33]    Error: Multiple errors reported.\ Failed to execute MI
command: -var-create - * &((((this)->test_object)).1) Error message from
debugger back end: -var-create: unable to create variable object\ Failed to
execute MI command: -var-create - * &((((this)->test_object)).1) Error message
from debugger back end: -var-create: unable to create variable object\ Unable
to create variable object


The expected behavior would be, of course, to see the full string instead of
"Error: Failed to execute MI ..."

Thank you very much for your help !

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