[Bug symtab/34389] Source code lookup fails for code at or near 0 when linking with garbage collection

https://sourceware.org/bugzilla/show_bug.cgi?id=34389

Tom Tromey <tromey at sourceware dot org> changed:

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                 CC|                            |tromey at sourceware dot org

--- Comment #2 from Tom Tromey <tromey at sourceware dot org> ---
(In reply to Andrew Burgess from comment #1)

> The current code assumes that the blockvector's address map is "perfect", if
> the address map claims to contain a given address then we assume that this
> is the correct block vector

I think it would be ideal to preserve this behavior; and if any data scrubbing
is needed, we should require that the debuginfo reader do this work.

> So this patch says that, if the PC we're looking for is within an address
> range that starts at zero then this might be a garbage collected range, and
> we shouldn't trust the address map.

I wonder why the existing section-at-zero mechanism isn't working here.
I suspect some spot in the DWARF reader should be filtering out these
bogus address ranges.

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