> What you can further do is to use the memcheck monitor commands to
> examine the definedness of the variables used on the line where the
> error is detected.
>
> See manual for more info
> http://www.valgrind.org/docs/manual/mc-manual.html#mc-manual.monitor-commands
Thanks, I didn't know about the "monitor get_vbits" command.
However, it seems I'm not able to catch any uninitialized variable. I
also get this kind of error in another library:
==17108== Use of uninitialised value of size 8
==17108== at 0x60BDB6D: decode_rs_char (decode_rs.h:118)
==17108== by 0x41D9B5: Code::decode(unsigned char*, int*, unsigned
int, bool) (Code.cpp:114)
==17108== by 0x41E6D8: Code::extract(char*, char*, std::string&,
unsigned int) (Code.cpp:326)
==17108== by 0x4060E4: main (test.cpp:178)
==17108== Uninitialised value was created by a stack allocation
==17108== at 0x60BD480: decode_rs_char (decode_rs_char.c:15)
And with vgdb I get this in gdb:
Program received signal SIGTRAP, Trace/breakpoint trap.
0x00000000060bdb6d in decode_rs_char (p=0x201aac50, data=0xffefff500 "",
eras_pos=0xffefff480, no_eras=22) at decode_rs.h:118
118 tmp = INDEX_OF[lambda[j - 1]];
I tried the get_vbits command in variables p, data, eras_pos and
no_eras. I had to manually find out the size of the corresponding
variables, since some of them are pointers or structs with pointer fields.
I seem to have computed the corresponding sizes correctly since if I use
a size 1 byte larger in the vget_bits command I get an "unaddressable"
warning (also represented by the underscore).
When you say "local variables" you mean the variables the function
received as argument or all variables defined inside the function?
I think I know the answer, since I remember having discussed this in the
mailing list: all variables inside the function are local, thus
allocated in the stack, so valgrind is not yet able to detect errors in
them? Can you confirm this?
I have to try using exp-sgcheck, right?
Thanks.
--
João M. S. Silva
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