[Bug libstdc++/53477] pretty printer fails with: Python Exception type 'exceptions.IndexError' list index out of range

[tomga at wp dot pl]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53477

--- Comment #24 from Tomasz Gajewski tomga at wp dot pl ---
Well, they certainly did not at that time, so I think the bug can be closed.

[Bug libstdc++/53477] pretty printer fails with: Python Exception type 'exceptions.IndexError' list index out of range

[tomga at wp dot pl]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53477

--- Comment #22 from Tomasz Gajewski tomga at wp dot pl ---
In comment #10 I've provided test patch to test case that exposed a problem
(and in comment #11 some fix to all those tests). Currently I can't check if it
applies cleanly and if errors occur. If you want probably I can find some time
in next few weeks.

[Bug libstdc++/53477] pretty printer fails with: Python Exception type 'exceptions.IndexError' list index out of range

[tomga at wp dot pl]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53477

--- Comment #10 from Tomasz Gajewski tomga at wp dot pl ---
Created attachment 30473
  -- http://gcc.gnu.org/bugzilla/attachment.cgi?id=30473action=edit
Patch to pretty printers testsuite to expose some problems

This patch adds into the testsuite additional cases with typedefs and
references to variables. This exposes problem described in this bug.

My proposed earlier patch to 'printers.py' fixes some new testcases from this
patch but not all of them.

[Bug libstdc++/53477] pretty printer fails with: Python Exception type 'exceptions.IndexError' list index out of range

[tomga at wp dot pl]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53477

--- Comment #11 from Tomasz Gajewski tomga at wp dot pl ---
Created attachment 30474
  -- http://gcc.gnu.org/bugzilla/attachment.cgi?id=30474action=edit
Patch that fixes all testcases added by me in previous patch to simple.cc

[Bug libstdc++/53477] pretty printer fails with: Python Exception type 'exceptions.IndexError' list index out of range

[tomga at wp dot pl]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53477

--- Comment #9 from Tomasz Gajewski tomga at wp dot pl ---
Following patch seems to solve this problem although I don't like it very much.
I think whole get_basic_type function should be moved to the beginning of
printers.py.

And additionally I'm not sure if this change does not break something somewhere
else. If not I think get_basic_type and find_type should be merged into one
function. If not calls to them should be replaced appappropriately. I leave it
to someone else.


Index: libstdcxx/v6/printers.py
===
--- libstdcxx/v6/printers.py(revision 200105)
+++ libstdcxx/v6/printers.py(working copy)
@@ -39,7 +39,7 @@
 # handles searching upward through superclasses.  This is needed to
 # work around http://sourceware.org/bugzilla/show_bug.cgi?id=13615.
 def find_type(orig, name):
-typ = orig.strip_typedefs()
+typ = Printer.get_basic_type(orig)
 while True:
 search = str(typ) + '::' + name
 try:

[Bug libstdc++/53477] pretty printer fails with: Python Exception type 'exceptions.IndexError' list index out of range

[tomga at wp dot pl]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53477

Tomasz Gajewski tomga at wp dot pl changed:

   What|Removed |Added

 CC||tomga at wp dot pl

--- Comment #8 from Tomasz Gajewski tomga at wp dot pl ---
The testcase can be reduced to:

#include map

typedef std::mapint, int IntToIntMap;

int main()
{
  IntToIntMap amap;
  IntToIntMap  mapref = amap;
  amap[1] = 1;
  return 0;
}

and the problem is with map references. Executing on line with 'amap[1] = 1;'
commands to print 'amap' and 'mapref' I get:

(gdb) set python print-stack full
(gdb) p mapref
Traceback (most recent call last):
  File /home/tomga/devel/gdb-scripts/python/libstdcxx/v6/printers.py, line
438, in children
rep_type = find_type(self.val.type, '_Rep_type')
  File /home/tomga/devel/gdb-scripts/python/libstdcxx/v6/printers.py, line
52, in find_type
field = typ.fields()[0]
IndexError: list index out of range
$3 = std::map with 0 elements
(gdb) p amap
$4 = std::map with 0 elements

I get this with:

$ g++ --version
g++ (Ubuntu/Linaro 4.7.3-1ubuntu1) 4.7.3
...
$ gdb --version
GNU gdb (GDB) 7.5.91.20130417-cvs-ubuntu
...

Pretty printers from svn://gcc.gnu.org/svn/gcc/trunk/libstdc++-v3/python
(currently latest revision: 200105.

Currently I don't know how to debug this further.