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

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?

Thanks again,
Shruti




On Sat, May 17, 2014 at 5:57 PM, Tobias Grosser <tobias at grosser.es>
wrote:
> On 17/05/2014 23:05, shruti padmanabha wrote:
>
>> Hi,
>>
>> Is there a way to associate LLVM IR instructions with the instructions
>> they
>> finally generate in the assembly file emitted by LLC? I need to track
the
>> PC's corresponding to certain IR level instructions for ARM.
>> One way to do this is to tag an IR instruction with a special flag and
>> pass
>> that flag onto the Machine IR created by LLC and then onto Machine
Code.
>> It
>> would be helpful if I could get some pointers on how to do this.
>>
>
> You may want to look at the -debug-ir pass, which creates METADATA to emit
> debugging information that allows you to associate machine instructions
> with IR instructions. This may or may not be what you want.
>
> Tobias
>


-- 
Shruti Padmanabha
University of Michigan, Ann Arbor
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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.

Cheers,
Tobisa

Hi,

Compiling for both x86 and ARM with llc aborts after this pass.
I have a simple helloworld.c program.

I am attaching the .ll file created by:
*clang -O3 -g -emit-llvm hello.c -c -o hello.bc*

*llvm-dis hello.bc*

Thanks again for the response!
Shruti


On Mon, May 19, 2014 at 1:28 AM, 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.
>
> Cheers,
> Tobisa
>
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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