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* [Bug python/11792] New: Provide access to the dynamic type of an object
@ 2010-07-06 16:00 andre dot poenitz at nokia dot com
  2010-07-07 10:26 ` [Bug python/11792] " andre dot poenitz at nokia dot com
                   ` (4 more replies)
  0 siblings, 5 replies; 6+ messages in thread
From: andre dot poenitz at nokia dot com @ 2010-07-06 16:00 UTC (permalink / raw)
  To: gdb-prs

There seems to be no easy way to get access to the dynamic type of a C++ object.
The problem is visible in the following script:

=================== snip ======================

rm -rf s && mkdir s && cd s

echo -e "
    class Base { public: virtual ~Base() {} };
    class Derived : public Base {};
    int main() {
        Base *b = new Derived;
        return (int)b;
    }" | g++ -g -xc++ -

gdb -ex 'file a.out' \
    -ex 'start' \
    -ex 'next' \
    -ex 'print b' \
    -ex 'set print object on' \
    -ex 'print b' \
    -ex 'python import gdb' \
    -ex 'python print "Python says: '%s'" % gdb.parse_and_eval("b").type' \
    -ex 'set confirm off' \
    -ex 'quit' 

=================== snip ======================


The result is:

  $1 = (Base *) 0x804b008
  $2 = (Derived *) 0x804b008
  Python says: Base *



It would be nice if there was a method accessible by Python that produces
"Derived *"

-- 
           Summary: Provide access to the dynamic type of an object
           Product: gdb
           Version: 7.1
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P2
         Component: python
        AssignedTo: unassigned at sourceware dot org
        ReportedBy: andre dot poenitz at nokia dot com
                CC: gdb-prs at sourceware dot org
 GCC build triplet: i486-linux-gnu
  GCC host triplet: i486-linux-gnu
GCC target triplet: i486-linux-gnu


http://sourceware.org/bugzilla/show_bug.cgi?id=11792

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^ permalink raw reply	[flat|nested] 6+ messages in thread
end of thread, other threads:[~2010-08-30 20:30 UTC | newest]

Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2010-07-06 16:00 [Bug python/11792] New: Provide access to the dynamic type of an object andre dot poenitz at nokia dot com
2010-07-07 10:26 ` [Bug python/11792] " andre dot poenitz at nokia dot com
2010-08-20 21:56 ` tromey at redhat dot com
2010-08-23  9:02 ` andre dot poenitz at nokia dot com
2010-08-23 17:58 ` tromey at redhat dot com
2010-08-30 20:30 ` tromey at redhat dot com

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