[Bug tools/22288] eu-addr2line doesn't find a rust file:line

["mark at klomp dot org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=22288

Mark Wielaard <mark at klomp dot org> changed:

           What    |Removed                     |Added
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                 CC|                            |mark at klomp dot org

--- Comment #1 from Mark Wielaard <mark at klomp dot org> ---
The problem is that there are no .debug_aranges. eu-addr2line uses that to know
which CU it needs to inspect to find the subprogram in.

Without .debug_aranges we would have to scan all CUs to create our own aranges
table by inspecting the DW_AT_low_pc/DW_AT_high_pc or DW_AT_ranges attributes.

In theory we could do that, but it is not immediately obvious when we should.
If there is no .debug_aranges at all then it might be sensible to assume this
does not mean there are really no CUs that cover program scope addresses. But
if there are .debug_aranges then it seems bad to assume they are wrong or
incomplete.

Best would be to fix rustc to generate .debug_aranges.

Second best would be to have a mechanism to for scanning all CUs and (re)create
the same cache that dwarf_getaranges() would create from the .debug_aranges
section for the CU. One question is if this isn't the default how it interacts
with other users of the aranges cache like dwarf_addrdie, dwfl_module_addrdie
and dwfl_module_getsrc. The last one is what eu-addr2line (and eu-stack) use.

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