[Bug tools/24550] New: eu-readelf does not know about DW_AT_GNU_bias

tromey at sourceware dot org sourceware-bugzilla@sourceware.org
Mon May 13 17:54:00 GMT 2019


            Bug ID: 24550
           Summary: eu-readelf does not know about DW_AT_GNU_bias
           Product: elfutils
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: tools
          Assignee: unassigned at sourceware dot org
          Reporter: tromey at sourceware dot org
                CC: elfutils-devel at sourceware dot org
  Target Milestone: ---

The Ada compiler can emit DW_AT_GNU_bias in some situations.

Here is "tt.adb":

with Text_IO; use Text_IO;
procedure Tt is
   type Small is range -7 .. -4;
   for Small'Size use 2;
   Y : Small := -5;

  type Repeat_Count_T is range 1 .. 2 ** 6;
  for Repeat_Count_T'Size use 6;
  X : Repeat_Count_T := 64;
  Put_Line (X'Image);
  Put_Line (Y'Image);
end Tt;

Compile with

gcc -fgnat-encodings=minimal -g -c tt.adb

gdb's dwarf2.def says:

/* Biased integer extension.
   See https://gcc.gnu.org/wiki/DW_AT_GNU_bias .  */
DW_TAG (DW_AT_GNU_bias, 0x2305)

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