llvm dev - May 2014 - [LLVMdev] Associate IR instruction with corresponding assembly

Interesting. My guess is that the debug-ir pass wasn't updated when we
changed some version of the debug metadata and so isn't producing good
metadata.

I'm not sure when I'll get to updating it though and it looks like
Daniel's address is bouncing.

-eric

On Mon, May 19, 2014 at 8:22 AM, shruti padmanabha <shrupad at umich.edu>
wrote:
> No. They're both from the 3.4 version of llvm.
> Thanks,
> Shruti
>
>
> On Mon, May 19, 2014 at 11:01 AM, Eric Christopher <echristo at
gmail.com>
> wrote:
>>
>> On Sun, May 18, 2014 at 10:28 PM, Tobias Grosser <tobias at
grosser.es>
>> wrote:
>> > On 19/05/2014 00:54, shruti padmanabha wrote:
>> >>
>> >> Hi,
>> >>
>> >> Thanks for the pointer. I am unfortunately running into llc
problems
>> >> with
>> >> this pass.
>> >> I did
>> >> *opt  -debug-ir   hello.bc -o hello.deb.bc*
>> >>
>> >> *llc -march=arm -debug  -O0 hello.deb.bc  -o hello.deb.s*
>> >>
>> >>
>> >> This is aborting with the error: llc:
>> >> llvm-3.4/lib/CodeGen/AsmPrinter/DwarfDebug.cpp:1614: void
>> >> llvm::DwarfDebug::beginFunction(const llvm::MachineFunction*):
>> >> Assertion
>> >> `TheCU && "Unable to find compile
unit!"' failed.
>> >> I'm assuming this is because llc found some errors in the
metadata that
>> >> debug-ir prints out. How do I find and correct this?
>> >
>> >
>> > This is indeed surprising. I have no idea where this is coming
from.
>> > Does
>> > this only happen on ARM? Can you attach the debug.bc file? Or even
>> > better,
>> > open a bug report for that?
>> >
>> > I included Daniel who committed the -debug-ir pass as well as Eric
who
>> > has
>> > better knowledge about debug info than me.
>> >
>>
>> Are you mixing versions of llc and opt? I.e. are they both built from
>> the same version?
>>
>> -eric
>
>

Oh, okay.
Which was the last version of llc that worked with the pass? I could try
working with an older version that is compatible.

Is there something else I can hack up to serve my purpose of mapping
assembly -> IR instructions?

Thanks for the help!
Shruti


On Mon, May 19, 2014 at 11:24 AM, Eric Christopher <echristo at
gmail.com>wrote:
> Interesting. My guess is that the debug-ir pass wasn't updated when we
> changed some version of the debug metadata and so isn't producing good
> metadata.
>
> I'm not sure when I'll get to updating it though and it looks like
> Daniel's address is bouncing.
>
> -eric
>
> On Mon, May 19, 2014 at 8:22 AM, shruti padmanabha <shrupad at
umich.edu>
> wrote:
> > No. They're both from the 3.4 version of llvm.
> > Thanks,
> > Shruti
> >
> >
> > On Mon, May 19, 2014 at 11:01 AM, Eric Christopher <echristo at
gmail.com>
> > wrote:
> >>
> >> On Sun, May 18, 2014 at 10:28 PM, Tobias Grosser <tobias at
grosser.es>
> >> wrote:
> >> > On 19/05/2014 00:54, shruti padmanabha wrote:
> >> >>
> >> >> Hi,
> >> >>
> >> >> Thanks for the pointer. I am unfortunately running into
llc problems
> >> >> with
> >> >> this pass.
> >> >> I did
> >> >> *opt  -debug-ir   hello.bc -o hello.deb.bc*
> >> >>
> >> >> *llc -march=arm -debug  -O0 hello.deb.bc  -o hello.deb.s*
> >> >>
> >> >>
> >> >> This is aborting with the error: llc:
> >> >> llvm-3.4/lib/CodeGen/AsmPrinter/DwarfDebug.cpp:1614: void
> >> >> llvm::DwarfDebug::beginFunction(const
llvm::MachineFunction*):
> >> >> Assertion
> >> >> `TheCU && "Unable to find compile
unit!"' failed.
> >> >> I'm assuming this is because llc found some errors in
the metadata
> that
> >> >> debug-ir prints out. How do I find and correct this?
> >> >
> >> >
> >> > This is indeed surprising. I have no idea where this is
coming from.
> >> > Does
> >> > this only happen on ARM? Can you attach the debug.bc file? Or
even
> >> > better,
> >> > open a bug report for that?
> >> >
> >> > I included Daniel who committed the -debug-ir pass as well as
Eric who
> >> > has
> >> > better knowledge about debug info than me.
> >> >
> >>
> >> Are you mixing versions of llc and opt? I.e. are they both built
from
> >> the same version?
> >>
> >> -eric
> >
> >
>


-- 
Shruti Padmanabha
University of Michigan, Ann Arbor
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On Mon, May 19, 2014 at 8:34 AM, shruti padmanabha <shrutip27 at
gmail.com> wrote:
> Oh, okay.
> Which was the last version of llc that worked with the pass? I could try
> working with an older version that is compatible.
>
Couldn't say, it would be a revision in svn, but I'm not sure what it
is. A lot of changes went into the format in 3.4.
> Is there something else I can hack up to serve my purpose of mapping
> assembly -> IR instructions?
Possibly not. It depends on accuracy. You could probably get the
instruction selector to put instructions as comments in the final IR,
but I don't necessarily think that's a small amount of work nor will
it be that accurate if it falls back to the DAG.

-eric
>
> Thanks for the help!
> Shruti
>
>
> On Mon, May 19, 2014 at 11:24 AM, Eric Christopher <echristo at
gmail.com>
> wrote:
>>
>> Interesting. My guess is that the debug-ir pass wasn't updated when
we
>> changed some version of the debug metadata and so isn't producing
good
>> metadata.
>>
>> I'm not sure when I'll get to updating it though and it looks
like
>> Daniel's address is bouncing.
>>
>> -eric
>>
>> On Mon, May 19, 2014 at 8:22 AM, shruti padmanabha <shrupad at
umich.edu>
>> wrote:
>> > No. They're both from the 3.4 version of llvm.
>> > Thanks,
>> > Shruti
>> >
>> >
>> > On Mon, May 19, 2014 at 11:01 AM, Eric Christopher <echristo at
gmail.com>
>> > wrote:
>> >>
>> >> On Sun, May 18, 2014 at 10:28 PM, Tobias Grosser <tobias at
grosser.es>
>> >> wrote:
>> >> > On 19/05/2014 00:54, shruti padmanabha wrote:
>> >> >>
>> >> >> Hi,
>> >> >>
>> >> >> Thanks for the pointer. I am unfortunately running
into llc problems
>> >> >> with
>> >> >> this pass.
>> >> >> I did
>> >> >> *opt  -debug-ir   hello.bc -o hello.deb.bc*
>> >> >>
>> >> >> *llc -march=arm -debug  -O0 hello.deb.bc  -o
hello.deb.s*
>> >> >>
>> >> >>
>> >> >> This is aborting with the error: llc:
>> >> >> llvm-3.4/lib/CodeGen/AsmPrinter/DwarfDebug.cpp:1614:
void
>> >> >> llvm::DwarfDebug::beginFunction(const
llvm::MachineFunction*):
>> >> >> Assertion
>> >> >> `TheCU && "Unable to find compile
unit!"' failed.
>> >> >> I'm assuming this is because llc found some
errors in the metadata
>> >> >> that
>> >> >> debug-ir prints out. How do I find and correct this?
>> >> >
>> >> >
>> >> > This is indeed surprising. I have no idea where this is
coming from.
>> >> > Does
>> >> > this only happen on ARM? Can you attach the debug.bc
file? Or even
>> >> > better,
>> >> > open a bug report for that?
>> >> >
>> >> > I included Daniel who committed the -debug-ir pass as
well as Eric
>> >> > who
>> >> > has
>> >> > better knowledge about debug info than me.
>> >> >
>> >>
>> >> Are you mixing versions of llc and opt? I.e. are they both
built from
>> >> the same version?
>> >>
>> >> -eric
>> >
>> >
>
>
>
>
> --
> Shruti Padmanabha
> University of Michigan, Ann Arbor