On Sun, 2006-05-07 at 11:26 -0400, Anthony DeRobertis wrote:
> Sorry for taking so long on this. Anyway, here it is:
>
> Program received signal SIGSEGV, Segmentation fault.
> [Switching to Thread 46912570136816 (LWP 7679)]
> 0x00002aaaae65701f in memcpy () from /lib/libc.so.6
> (gdb) bt
> #0 0x00002aaaae65701f in memcpy () from /lib/libc.so.6
> #1 0x000000000054d29d in
> std::string::_S_construct<__gnu_cxx::__normal_iterator<char*, std::string> >
> (__beg={_M_current = 0xff24e8 " layers groups"},
> __end=<value optimized out>, __a=<value optimized out>)
> at char_traits.h:269
> #2 0x000000000054d2d9 in basic_string<__gnu_cxx::__normal_iterator<char*,
> std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > (
> this=0x7fffffcfad70, __beg={_M_current = 0x2aaab1232b28 ""}, __end=
> {_M_current = 0x1032fe8 ""}, [EMAIL PROTECTED]) at basic_string.h:1444
> #3 0x0000000000553460 in studio::DockDialog::set_contents (this=0xfe24c0,
> z=<value optimized out>) at dockdialog.cpp:506
[...]
That line (506) in dockdialog.cpp looks like this:
book_contents=String(str.begin(),str.begin()+separator);
This should throw std::length_error if, for example, the first iterator
would go beoynd the second. I don't know exactly what will happen if the
second iterator is advanced beyond the length of the string. Maybe
that's the problem.
Anthony, any chance you could try the following things:
* Could you compile the attached file (g++ -g -o test test.cpp)
and run it under gdb? If it crashes in the same way, we have a
smaller test case to work with.
* Could you apply the attached patch to src/gtkmm/dockdialog.cpp,
recompile and provide the output? Or put a gdb breakpoint at
dockdialog.cpp:506 and then print the value of str and
separator?
Sorry I can't provide the package with that debugging patch built in,
but network connectivity is a bit limited here at debcamp6.
--
Fabian Fagerholm <[EMAIL PROTECTED]>
#include <iostream>
#include <string>
using namespace std;
int main()
{
string str1 = string("abcdefghi");
unsigned int separator = str1.find_first_of('e');
string str2 = string(str1.begin(), str1.begin() + separator);
cout << str1 << " " << separator << endl;
cout << str2 << endl;
for (int i = 0; i < 64; i++) {
string str3 = string(str1.begin(), str1.begin() + separator + i);
cout << str3 << " (i == " << i << ")" << endl;
}
return 0;
}
Index: dockdialog.cpp
===================================================================
--- dockdialog.cpp (revision 132)
+++ dockdialog.cpp (working copy)
@@ -503,6 +503,8 @@
}
else
{
+ cout << "DEBUG: str.begin() == " << str.begin() << endl;
+ cout << "DEBUG: separator == " << separator << endl;
book_contents=String(str.begin(),str.begin()+separator);
str=String(str.begin()+separator+1,str.end());
}
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