On 05/08/2019 20:20, Greg Clayton via lldb-commits wrote:
On Aug 5, 2019, at 11:11 AM, <paul.robin...@sony.com> <paul.robin...@sony.com>
wrote:
I also tried to obj2yaml the good DWARF and change it, but once you
add bytes all of the section sizes and offsets are off so that was
not very fruitful, so I ran into errors when trying to convert the
yaml back to and ELF file.
Greg
Yet another case where a "DWARF assembler" would be useful.
Yeah, that is why I made the DWARFGenerator class in
llvm/unittests/DebugInfo/DWARF/DwarfGenerator.cpp so I can hand craft DWARF
where I can change offsets and move stuff around. It doesn't create an ELF file
with section contents for .text or anything though.
While it definitely leaves a lot to be desired, I have found it
relatively easy to take the output of "clang -S", and then tweak the
generated dwarf assembly to produce the kind of output I need for
testing various edge cases.
This case also does not sound particularly hard. I'd probably do it by
taking one of the existing DWARF .s test files and modify it to trigger
this situation. My first candidate would be
lit/SymbolFile/DWARF/forward-declarations.s -- it already has a struct
with a DW_AT_declaration attribute, so probably all that's needed is to
add a DW_AT_calling_convention to it. The assembly is already updated to
use symbolic addresses, so no manual fixups of offsets should be needed.
pl
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