Re: [DynInst_API:] Iterating over instructions in bpatch basic blocks

[Bill Williams <bill@xxxxxxxxxxx>]

On 12/02/2013 09:43 AM, Wayne Motycka wrote:
> I've built a method/function that intends to iterate over 2 BPatch_addressSpace
> objects that I have opened from disk.  This works as expected when ran within
> Eclipse but when I run it from the command line I get differing results coming
> from accessing/iterating over a BPatch_basicBlock -> getInstructions()
> collection/vector.  My method iterates over the first 4 instructions finding
> the same in both addressSpaces (I'm using two copies of the same executable
> so they should all agree) then I begin to see reported differences in the string
> representation (format() method of Instruction) as well as the operands in the
> instruction.
>
> So, is this a known problem with the InstructionAPI, that you cannot rely on what
> it parses?  I've  posted my method on pastebin as: http://pastebin.com/6UiJvhSh
> if you want to see what/how I'm iterating over the instructions in the blocks.
This seems remarkably unlikely to be an instructionAPI problem. Much 
more likely that getProcedures or getAllBasicBlocks is returning 
something that's sorted by pointer and not by mutatee address (which 
could well be stable with a debug heap and not with a normal one)...if 
you're actually looking at the same bytes, you'll get the same 
instructions out.
For a sanity check, can you throw in the start address of each 
block/function and put up some sample output?
> -Wayne
>
>
> _______________________________________________
> Dyninst-api mailing list
> Dyninst-api@xxxxxxxxxxx
> https://lists.cs.wisc.edu/mailman/listinfo/dyninst-api

--
--bw

Bill Williams
Paradyn Project
bill@xxxxxxxxxxx