This is the mail archive of the
archer@sourceware.org
mailing list for the Archer project.
Re: [python][rfc] Attempt to print the base class if a there is noPython pretty-printer for a derived class.
- From: Phil Muldoon <pmuldoon at redhat dot com>
- To: Tom Tromey <tromey at redhat dot com>
- Cc: Pedro Alves <alves dot ped at gmail dot com>, archer at sourceware dot org, Paul Pluzhnikov <ppluzhnikov at google dot com>
- Date: Fri, 27 Mar 2009 18:03:37 +0000
- Subject: Re: [python][rfc] Attempt to print the base class if a there is noPython pretty-printer for a derived class.
- References: <49CD0730.8070000@redhat.com> <200903271743.11238.alves.ped@gmail.com> <m3vdpusvm8.fsf@fleche.redhat.com>
Tom Tromey wrote:
"Pedro" == Pedro Alves <alves.ped@gmail.com> writes:
Pedro> Does this do sensible things if class Y has some
Pedro> fields that mask the Base class's ones, when you only have a
Pedro> pretty printer for Base?
Yeah... it pretty-prints Base, then goes on to print the subclass
fields as usual (perhaps pretty-printing them as well).
Phil, could you post the before- and after- results of your example?
I think that would clear things up.
Here (attached) is a file I was using today to test some scenarios. They
do not directly address Pedro's questions (I think your explanation
does). But they do address on of Paul's.
[pmuldoon@localhost gdb]$ ./gdb ~/derived
(pg-gdb) b 45
Reading in symbols for /home/pmuldoon/derived.cpp...
Breakpoint 1 at 0x400b40: file /home/pmuldoon/derived.cpp, line 45.
(pg-gdb) python import gdb.libstdcxx.v6.printers
(pg-gdb) r
Breakpoint 1, main () at /home/pmuldoon/derived.cpp:45
45 return 0;
(pg-gdb) info locals
map = std::map with 1 elements = {
[0x40363d "one"] = 1
}
uomap = std::tr1::unordered_map with 1 elements = {
[21] = 0x403645 "twenty one"
}
nest = {
<Z> = std::map with 1 elements = {
[0x403650 "twenty-two"] = 22
},
members of X:
map = std::tr1::unordered_map with 1 elements = {
[23] = 0x403638 "test"
},
i = 0
}
base = std::map with 1 elements = {
[0x403641 "two"] = 2
}
#include <map>
#include <tr1/unordered_map>
class Y : public std::tr1::unordered_map<int, char *>
{
public:
Y()
{
}
};
class Z : public std::map<const char *, int>
{
public:
Z()
{
}
};
class X : public Z
{
public:
Y map;
int i;
X ()
{
i=0;
map[23] = "test";
}
};
int main()
{
Z map;
Y uomap;
X nest;
std::map<const char *, int> base;
map["one"] = 1;
base["two"] = 2;
uomap[21] = "twenty one";
nest["twenty-two"] = 22;
return 0;
}