[Podofo-users] Weird exception from unused code

[Florian Hänel]

I have built podofo 0.9.5 as a dynamic library on linux x64.

the following code aborts in the PdfDocument constructor, but only if
notcalled exists:

#include "podofo/podofo.h"

int main(int argc, char** argv) {
    printf("%s:%i\n",__FILE__,__LINE__);
    PoDoFo::PdfMemDocument* doc = new PoDoFo::PdfMemDocument(); // exception 
here
    printf("%s:%i\n",__FILE__,__LINE__);
    doc->Load("test2-annotated.pdf");
    printf("%s:%i\n",__FILE__,__LINE__);
}

void notcalled(PoDoFo::PdfAnnotation* anno) {
    PoDoFo::PdfObject* obj = anno->GetObject();
    printf("%i\n", obj->HasStream());
}

if notcalled does *not* exist, it works as expected.


$ g++ -std=gnu++11 podofotest.cpp -L build-podofo-0.9.5/src -l podofo -I
podofo-0.9.5 -I build-podofo-0.9.5

LD_LIBRARY_PATH=build-podofo-0.9.5/src gdb ./a.out

(gdb) bt
#0  0x00007ffff7008428 in __GI_raise (sig=sig@entry=6) at
../sysdeps/unix/sysv/linux/raise.c:54
#1  0x00007ffff700a02a in __GI_abort () at abort.c:89
#2  0x00007ffff764184d in __gnu_cxx::__verbose_terminate_handler() ()
from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#3  0x00007ffff763f6b6 in ?? () from
/usr/lib/x86_64-linux-gnu/libstdc++.so.6
#4  0x00007ffff763f701 in std::terminate() () from
/usr/lib/x86_64-linux-gnu/libstdc++.so.6
#5  0x00007ffff763f919 in __cxa_throw () from
/usr/lib/x86_64-linux-gnu/libstdc++.so.6
#6  0x00007ffff7a7fd27 in PoDoFo::PdfVariant::DelayedLoadImpl() () from
build-podofo-0.9.5/src/libpodofo.so.0.9.5
#7  0x00000000004015b2 in PoDoFo::PdfVariant::DelayedLoad() const ()
#8  0x00007ffff7a48d9a in PoDoFo::PdfVariant::GetDictionary() () from
build-podofo-0.9.5/src/libpodofo.so.0.9.5
#9  0x00007ffff7a7e829 in
PoDoFo::PdfObject::PdfObject(PoDoFo::PdfReference const&, char const*)
() from build-podofo-0.9.5/src/libpodofo.so.0.9.5
#10 0x00007ffff7a9c67f in PoDoFo::PdfVecObjects::CreateObject(char
const*) () from build-podofo-0.9.5/src/libpodofo.so.0.9.5
#11 0x00007ffff7ac48b3 in PoDoFo::PdfDocument::PdfDocument(bool) () from
build-podofo-0.9.5/src/libpodofo.so.0.9.5
#12 0x00007ffff7b0bf6f in PoDoFo::PdfMemDocument::PdfMemDocument() ()
from build-podofo-0.9.5/src/libpodofo.so.0.9.5
#13 0x0000000000400c16 in main ()


clang++ and g++ behave the same. valgrind complains about an uninitialized 
value in the error case


Florian 


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