Re: [sigc] Incorrect memory read in libsigc++-2.0.3 when compiled without optimization

[Martin Schulze <martin-ml hippogriff de>]

Am 02.06.2004 19:14:20 schrieb(en) Martin Schulze:
> Am 02.06.2004 09:38:34 schrieb(en) Andris Pavenis:
> > Noticed incorrect memory read in included example when it was  
> > compiled
> > without optimizations (-O0). It's most likely a bug in GCC, as
> > it doesn't appear with -O1 or -O2. Tested under Linux.
> >
> > I have libsigc++-2.0.3, gcc-3.3.3, valgrind-2.1.1
>
> I will investigate. Thanks for the pointer!
> (Ah, debian sarge rocks on my notebook since yesterday :-))

Cannot reproduce even though I happen to have the same versions of all  
tools installed (libsigc++-2.0.3, gcc-3.3.3, valgrind-2.1.1).

Regards,

 Martin

> Regards,
>
>  Martin
>
> > Andris
> >
> > #include <string>
> > #include <iostream>
> > #include <sigc++/sigc++.h>
> >
> > struct Foo
> > {
> >    bool f1 (std::string s, bool x)
> >    {
> >       std::cout << x << " : " << s << std::endl;
> >    }
> > };
> >
> > int main (int argc, const char * argv[])
> > {
> >    Foo foo;
> >    sigc::slot<void,bool,std::string> slot_1;
> >    slot_1 = sigc::group(
> >            sigc::hide_return(sigc::mem_fun(foo, &Foo::f1)),
> >            sigc::_2,
> >            sigc::_1);
> >
> >    slot_1 (false, argv[0]);
> >    return 0;
> > }
> >
> > CXX = g++
> > CXXFLAGS = -O0 -g $(shell pkg-config --cflags sigc++-2.0)
> > LDFLAGS = $(shell pkg-config --libs sigc++-2.0)
> >
> > all:	prog
> > 	valgrind --tool=memcheck ./foo *
> >
> > prog:	foo
> >
> > foo:	foo.o
> > 	g++ -o foo foo.o $(LDFLAGS)
> >
> > g++ -O0 -g -I/usr/include/sigc++-2.0 -I/usr/lib/sigc++-2.0/include
> > -c -o foo.o foo.cc
> > g++ -o foo foo.o -lsigc-2.0
> > valgrind --tool=memcheck ./foo *
> > ==19457== Memcheck, a memory error detector for x86-linux.
> > ==19457== Copyright (C) 2002-2004, and GNU GPL'd, by Julian Seward.
> > ==19457== Using valgrind-2.1.1, a program supervision framework for
> > x86-linux.
> > ==19457== Copyright (C) 2000-2004, and GNU GPL'd, by Julian Seward.
> > ==19457== For more details, rerun with: -v
> > ==19457==
> > ==19457== Invalid read of size 1
> > ==19457==    at 0x80495C6:  
> > _ZNK4sigc13lambda_group2INS_21retype_return_functorIvNS_18bound_mem_functor2Ib3FooSsbEEEENS_6lambdaINS_8internal14lambda_select2EEENS6_INS7_14lambda_select1EEEEclIRKbRKSsEENSC_18deduce_result_typeIT_T0_vvvvvE4typeESJ_SK_
> > (group.h:227)
> > ==19457==    by 0x8049586:  
> > _ZNK4sigc8internal11lambda_coreINS_13lambda_group2INS_21retype_return_functorIvNS_18bound_mem_functor2Ib3FooSsbEEEENS_6lambdaINS0_14lambda_select2EEENS8_INS0_14lambda_select1EEEEELb1EEclIRKbRKSsEENSE_18deduce_result_typeIT_T0_vvvvvE4typeESL_SM_
> > (base.h:71)
> > ==19457==    by 0x8049566: sigc::internal::slot_call2<sigc:: 
> > lambda<sigc::lambda_group2<sigc::retype_return_functor<void,
> > sigc::bound_mem_functor2<bool, Foo, std::string, bool> >,
> > sigc::lambda<sigc::internal::lambda_select2>,
> > sigc::lambda<sigc::internal::lambda_select1> > >, void, bool,
> > std::string>::call_it(sigc::internal::slot_rep*, bool const&,
> > std::string const&) (slot.h:158)
> > ==19457==    by 0x8049045: sigc::slot2<void, bool,
> > std::string>::operator()(bool const&, std::string const&) const
> > (slot.h:573)
> > ==19457==  Address 0x4FFFE247 is just below %esp.  Possibly a bug in
> > GCC/G++
> > ==19457==   v 2.96 or 3.0.X.  To suppress, use:
> > --workaround-gcc296-bugs=yes
> > 0 : ./foo
> > ==19457==
> > ==19457== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 19  
> > from
> > 1)
> > ==19457== malloc/free: in use at exit: 960 bytes in 1 blocks.
> > ==19457== malloc/free: 3 allocs, 2 frees, 1080 bytes allocated.
> > ==19457== For a detailed leak analysis,  rerun with: --leak- 
> > check=yes
> > ==19457== For counts of detected errors, rerun with: -v
> >
> > _______________________________________________
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