Valgrind won't return source lines!

Question

I've tried running valgrind (memcheck and massif) on an app I wrote, but all I get back are addresses for the functions that executed.

---------------------------------
Context accounted for  0.6% of measured spacetime
  0x805F29A: (within prog_name)
  0x8141740: (within prog_name)

Called from:
   0.6% : 0x812E077: (within prog_name)

---------------------------------
Context accounted for  0.5% of measured spacetime
  0x805F29A: (within prog_name)
  0x81418FB: (within prog_name)

Called from:
   0.5% : 0x812E077: (within prog_name)

I compiled my app with the -g flag to put the debugging symbols in. Is there any other reason why valgrind wouldn't show the source line?

EDIT: valgrind version 3.2.1-Debian; g++ 4.3.1

Answer 1

I guess, you are not mentioning right flags, and going with default flags.

--show-reachable is one such flag which should be enabled, please look at other flags and enable them.

--Cheers

Answer 2

I discovered that I passed in both the -g and -ggdb flags to g++ at compile time. Omitting the -g flag caused this issue to go away.

Answer 3

There are a couple of possible reasons:

• you may have inadvertently stripped your executable (most likely explanation),
• you may be executing JITted code (though the address doesn't look like that's the case).

What does file prog_name say? If it says "stripped", that's a problem. You might also want to check whether other tools, e.g. GDB know what symbol is at address 0x805F29A:

gdb prog_name
(gdb) info symbol 0x805F29A