Oops. I started typing my response and then decided to respond inline.
Forgot to delete my partial original response. :)
On 9 May 2017 at 12:36, Siddharth Nilakantan <sid....@gmail.com> wrote:
> Hi Ivo,
>
> The goal is to get at the
>
> Thanks,
> Sid
>
> On 9 May 2017 at 00:48, Ivo Raisr <iv...@ivosh.net> wrote:
>
>> 2017-05-08 20:39 GMT+02:00 Siddharth Nilakantan <sid....@gmail.com>:
>> > Hi Mike and Ivo,
>> >
>> > I noticed a thread where you guys had a discussion going.
>> >
>> > https://sourceforge.net/p/valgrind/mailman/message/35687503/
>> >
>> > I was playing around with writing a tool that does some online analysis
>> of
>> > register reads/writes. Basically, the tool needs to know every register
>> > read/write performed by the user program.
>>
>> Hi Sid,
>>
>> What is the ultimate goal of your analysis tool?
>
>
> I want to discover the critical paths in different phases of a program,
> the first step of which is to able to build paths.
>
>
>> > Due to minor ambiguity in the documentation (both in the code and the
>> PLDI paper), I discovered the hard
>> > way that VG_(track_post_reg_write) and VG_(track_pre_reg_read) are
>> functions
>> > that are called only around syscalls. I'm guessing that any
>> VG_(track_pre_*)
>> > and VG_(track_post_*) functions occur only around syscalls.
>>
>> Yes, indeed.
>> Every tool also works with the IR (intermediate representation) - this
>> where you
>> can catch (and instrument) register reads and writes.
>>
>> I.
>>
> Yes this is what I had originally started doing. I found it a bit more
> challenging than expected. Iex_Gets represent register reads. The
> instrument function sees a lot of IRExpr* for Load data or Put data, which
> we need to recursively explore to find Iex_Gets...
>
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