[LLVMdev] "Cannot fine DIE"

[Talin]

On Wed, Sep 1, 2010 at 8:31 AM, Talin <viridia at gmail.com> wrote:

> On Wed, Sep 1, 2010 at 5:31 AM, Jonas Maebe <jonas.maebe at elis.ugent.be>wrote:
>
>>
>> On 01 Sep 2010, at 08:47, Talin wrote:
>>
>> > Once again, I have no idea what this means or how to go about
>> > debugging it.
>> > This is my biggest frustration with DIFactory - there's absolutely
>> > no way to
>> > verify that the DWARF debugging information that I've emitted into
>> > my module
>> > is correct or even sensible. The only way to test it is to try and
>> > debug it
>> > with gdb, but all that will tell you is that *something* failed - it
>> > won't
>> > tell you where or what. It's not so much like looking for a needle
>> > in a
>> > haystack - more like looking for a particular needle in a needlestack.
>>
>> You can also try running  "dwarfdump --verify" on your dsymutil file
>> (not on the dSYM bundle, but on the file inside the bundle). It
>> sometimes gives a bit more information. Also simply using "dwarfdump -
>> a" can be helpful to see wrong references (e.g., if the type info is
>> structurally invalid then dwarfdump may simply stop dumping at that
>> point, so you know where the error is).
>>
>> Ah OK thanks, that's helpful.
>
> I tried what you suggested, and it prints out about 4000 lines and then
> segfaults, The last lines that it prints out are:
>
>  .debug_frame contents:
>
> 0x00000000: CIE
>         length: 0x00000010
>         CIE_id: 0xffffffff
>        version: 0x01
>   augmentation: ""
>     code_align: 1
>     data_align: -4
>    ra_register: 0x08
>                 DW_CFA_def_cfa (4 (esp), 4)
>                 DW_CFA_offset (8 (eip), 0)
>                 DW_CFA_nop
>                 DW_CFA_nop
>   Instructions: Init State: CFA=esp+4     eip=[CFA]
>
>
> 0x00000014: FDE
>         length: 0x00000028
>    CIE_pointer: 0x00000000
>
>
> I'm not sure how the contents of this structure relate to the various LLVM
> API calls used in creating debugging info...
>

OK I figured it out, something is wrong with my descriptors for local
variables...

Thanks again! :)

>
>> Jonas
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>>
>
>
>
> --
> -- Talin
>



-- 
-- Talin
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