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From: "vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>
To: dwz@sourceware.org
Subject: [Bug default/27463] New: [dwz] Unhandled DW_FORM_sdata for
 DW_AT_decl_line
Date: Wed, 24 Feb 2021 07:54:46 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D27463

            Bug ID: 27463
           Summary: [dwz] Unhandled DW_FORM_sdata for DW_AT_decl_line
           Product: dwz
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: default
          Assignee: nobody at sourceware dot org
          Reporter: vries at gcc dot gnu.org
                CC: dwz at sourceware dot org
  Target Milestone: ---

Regression since commit 4100572 "Handle DW_FORM_implicit_const for
DW_AT_decl_line".

With the gdb regression testsuite, using target board cc-with-dwz, we run i=
nto:
...
$ dwz
build/gdb/testsuite/outputs/gdb.trace/unavailable-dwarf-piece/unavailable-d=
warf-piece
-o z
dwz: unavailable-dwarf-piece: Unhandled DW_FORM_sdata for DW_AT_decl_line
...

The commit added this code:
...
          switch (form)
            {
            case DW_FORM_data1: value =3D read_8 (ptr); handled =3D true; b=
reak;
            case DW_FORM_data2: value =3D read_16 (ptr); handled =3D true; =
break;
            case DW_FORM_data4: value =3D read_32 (ptr); handled =3D true; =
break;
            case DW_FORM_data8: value =3D read_64 (ptr); handled =3D true; =
break;
            case DW_FORM_udata:
              value =3D read_uleb128 (ptr); handled =3D true; break;
            case DW_FORM_implicit_const:
              value =3D t->values[i]; handled =3D true; break;
            default:
              error (0, 0, "%s: Unhandled %s for %s",
                     dso->filename, get_DW_FORM_str (form),
                     get_DW_AT_str (t->attr[i].attr));
              return 1;
            }
...
and the error case triggers.

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