[LLVMdev] Associate IR instruction with corresponding assembly

[Bruce Hoult]

Yes, that one crashes for me for every architecture I tried except the
experimental AVR target — which doesn't support dwarf.

        .file   "hello.deb.ll"

        .text

        .globl  main

        .align  2

        .type   main, at function

main:                                   ; @main

; BB#0:                                 ; %entry

        ldi     r24, lo8(.L.str)

        ldi     r25, hi8(.L.str)

        push    r25

        push    r24

        call    printf

        in      r30, 61

        in      r31, 62

        adiw    r30, 2

        in      r0, 63

        cli

        out     62, r31

        out     63, r0

        out     61, r30

        ldi     r22, 1

        ldi     r23, 0

        ldi     r24, 0

        ldi     r25, 0

        ret

.Ltmp0:

        .size   main, .Ltmp0-main


        .type   .L.str, at object          ; @.str

        .section        .rodata.str1.1,"aMS", at progbits,1

.L.str:

        .asciz  "Hello World"

        .size   .L.str, 12



On Mon, May 19, 2014 at 5:59 PM, shruti padmanabha <shrupad at umich.edu>wrote:

> Oops, I didn't attach the .ll file after the -debug-ir pass. Adding it
> here.
>
>
>
> On Mon, May 19, 2014 at 1:55 AM, shruti padmanabha <shrupad at umich.edu>wrote:
>
>> 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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