[lldb-dev] Status of DWARF64 in LLDB

[Jan Kratochvil via lldb-dev]

On Mon, 11 Mar 2019 20:45:48 +0100, Zachary Turner via lldb-dev wrote:
> I want to ask what the status of DWARF64 in LLDB is.

IMO there isn't as for example:
lldb/source/Plugins/SymbolFile/DWARF/DIERef.cpp
is using bits 32..63 for additional info (DWO file offset/index for example)
while only bits 0..31 are used for DIE offset inside .debug_info section.

lldb/include/lldb/Core/dwarf.h
#ifdef DWARFUTILS_DWARF64
but nobody ever defines DWARFUTILS_DWARF64 and so it uses:
typedef uint32_t dw_offset_t; // Dwarf Debug Information Entry offset for any
                              // offset into the file


> For example, I > know that clang and LLVM will not even generate DWARF64,

Even GCC needs to be patched to generate DWARF64.


> Certainly we can improve LLVM's support for consuming DWARF64, but it's a
> question of priorities.

I think it is never needed in real world as long as one uses DWP and/or
-fdebug-types-section.  Red Hat is using neither (for DWZ postprocessing) and
so I did hit this limit of unsupported DWARF64 in GNU utilities [attached].


Jan
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