[Dwarf-Discuss] DWARF and online-compiled programs (Simon Brand)

Simon Brand simon at codeplay.com
Wed Jun 15 07:01:52 PDT 2016


This approach seems promising; it's probably easier to specify and keeps 
all the necessary information within DWARF. We'd definitely need to 
allow the line table and compile unit information to reference the same 
string so that there's no duplication.

Thanks,

Simon


On 13/06/16 11:22, Pedro Alves wrote:
> On 06/13/2016 09:07 AM, Simon Brand wrote:
>
>> Also, the source might not be "in memory", as it might be placed in a
>> binary segment which is not loaded. The debugger should be interpreting
>> the location as something like the ELF virtual address to locate the
>> source in the object file.
> In that case, wouldn't it be better to instead represent the source
> as another debug string, with DW_FORM_string, or
> .debug_str/DW_FORM_strp, or .debug_str_offsets/DW_FORM_strx, etc. ?
>
> For example, add a new attribute, e.g., DW_AT_source, and in 3.1.1
> where DW_AT_name is described:
>
>   Compilation unit entries may have the following attributes:
>   ...
>   2. A DW_AT_name attribute whose value is a null-terminated string containing
>   the full or relative path name of the primary source file from which the
>   compilation unit was derived.
>
> Change it to say either DW_AT_name or DW_AT_source.  Something like:
>
>   2. Either a DW_AT_name attribute whose value is a null-terminated string
>   containing the full or relative path name of the primary source file from
>   which the compilation unit was derived, or a DW_AT_source attribute whose
>   value is a null-terminated string containing the full contents of the source
>   code from which the compilation unit was derived.
>
> Thanks,
> Pedro Alves
>

-- 
Simon Brand
Staff Software Engineer
Codeplay Software Ltd
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