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From: "vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug symtab/28200] DW_AT_ranges handling in partial_die_info::read
 does not handle discontinuous ranges
Date: Fri, 06 Aug 2021 11:18:09 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D28200

--- Comment #1 from Tom de Vries <vries at gcc dot gnu.org> ---
Using this hack:
...
diff --git a/gdb/dwarf2/read.c b/gdb/dwarf2/read.c
index bac02b5a1bd..394e69b79d3 100644
--- a/gdb/dwarf2/read.c
+++ b/gdb/dwarf2/read.c
@@ -19327,7 +19327,10 @@ partial_die_info::read (const struct die_reader_sp=
ecs
*reader,

            if (dwarf2_ranges_read (ranges_offset, &lowpc, &highpc, cu,
                                    nullptr, tag))
-             has_pc_info =3D 1;
+             {
+               highpc =3D lowpc + 1;
+               has_pc_info =3D 1;
+             }
          }
          break;

...
gets rid of the warning:
...
(gdb) bt^M
#0  0x00000000004004bb in baz ()^M
#1  0x00000000004004c7 in foo_low ()^M
#2  0x00000000004004e9 in someothername ()^M
#3  0x00000000004004b0 in main ()^M
(gdb) PASS: gdb.dwarf2/dw2-ranges-psym.exp: bt
...
while allowing the original test-case (so without the patch applied) still =
to
pass.

But it basically inverts the problem: instead of claiming too much addresse=
s in
the partial symtab, it claims to few, so I guess this is really a hack rath=
er
than a fix.  With this hack, I expect problems of the sort of:
- trying to find an address in full symtabs fails (because the corresponding
  partial symtab is not expanded yet)
- trying to find address in partial symtabs fails (because of the hack)
- we conclude we can't find any debug info corresponding to the address, wh=
ich
  is incorrect.

--=20
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