Hi all,
I used db--detach option to invoke the debugger from
valgrind when the invalid read occurred, here is what
i got.
----------------------------------
Program received signal SIGSTOP, Stopped (signal).
ABCParser::parseString (this=0x344b86f0) at
stl_vector.h:501
501 operator[](size_type __n) { return
*(begin() + __n); }
----------------------------------
thats where the invalid read occurred.
Now i used backtrace to get where it was invoked.
----------------------------------
gdb) backtrace
#0 ABCParser::parseString (this=0x344b86f0) at
stl_vector.h:501
#1 0x341bb8f3 in ABCParser::execute (this=0x344b86f0)
at ABCParser.cpp:97
#2 0x080499aa in main (argc=2, argv=0x9c5fdc64) at
testAlgo.cpp:31
----------------------------------
it again says that the error occured in the function.
parseString() (but no line number is shown :-( )
I tried looking into what stl_vector.h is doing at the
specified lines using the list command...and here is
what i got.
-----------------------------------
ABCParser::parseString (this=0x344b86f0) at
stl_vector.h:501
501 operator[](size_type __n) { return
*(begin() + __n); }
(gdb) list
496 * Note that data access with this
operator is unchecked and
497 * out_of_range lookups are not
defined. (For checked lookups
498 * see at().)
499 */
500 reference
501 operator[](size_type __n) { return
*(begin() + __n); }
502
503 /**
504 * @brief Subscript access to the data
contained in the %vector.
505 * @param n The index of the element
for which data should be
(gdb)
-----------------------------------------------------
it doesn't seem to say anything more....i know that
the invalid read is cause when a vector variable is
read beyond its boundary....but which one?? there are
so many vectors in my prog...and it is a one huge
function.
please shed some light.
thanks
vatsan
--- John Love-Jensen <eljay@xxxxxxxxx> wrote:
> Hi Srivatsan,
>
> > Isn't line 501 inside stl_vector.h?
>
> Yes.
>
> If you want, break into the debugger (gdb) and do a
> backtrace to see where
> up the stack which frame and what line your routine
> was at.
>
> Make sure you compile your code with -g.
>
> --Eljay
>
>
"MAN'S EGO IS THE FOUNTAINHEAD OF HUMAN PROGRESS"
Ayn Rand.
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