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From: "mark at klomp dot org" <sourceware-bugzilla@sourceware.org>
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Subject: [Bug default/27449] dwz: 1: Unknown DWARF DW_OP_0
Date: Thu, 04 Mar 2021 14:43:44 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D27449

--- Comment #11 from Mark Wielaard <mark at klomp dot org> ---
With gcc (GCC) 11.0.0 20210225 on arm64 (which defaults to DWARF5) this
produces:

 [   179]              variable             abbrev: 23
                       abstract_origin      (ref4) [   1ec]
                       location             (sec_offset) location list [   =
 30]
                       GNU_locviews         (sec_offset) location list [   =
 2e]

 [   1ec]        variable             abbrev: 7
                 name                 (string) "f16"
                 decl_file            (implicit_const) audiovisualwaveform.=
ii
(1)
                 decl_line            (data1) 8
                 decl_column          (data1) 10
                 type                 (ref4) [   1f9]

 [   1f9]    base_type            abbrev: 2
             byte_size            (data1) 2
             encoding             (data1) float (4)
             name                 (strp) "__fp16"

DWARF section [ 8] '.debug_loclists' at offset 0x4d9:
Table at Offset 0x0:

 Length:               64
 DWARF version:         5
 Address size:          8
 Segment size:          0
 Offset entries:        0
 CU [     c] base: .text+000000000000000000 <_Z6memcpyPv>

  Offset: c, Index: 0
    view pair 0, 0

  Offset: e, Index: 2
    offset_pair 28, 40
      .text+0x0000000000000028 <_Z29AudioVisualWaveformDrawSamplev+0x18>..
      .text+0x000000000000003f <_Z29AudioVisualWaveformDrawSamplev+0x2f>
        [ 0] reg19
    end_of_list

  Offset: 14, Index: 8
    view pair 1, 6

  Offset: 16, Index: a
    offset_pair 34, 34
      .text+0x0000000000000034 <_Z29AudioVisualWaveformDrawSamplev+0x24>..
      .text+0x0000000000000033 <_Z29AudioVisualWaveformDrawSamplev+0x23>
        [ 0] implicit_value: 4 byte block: 00 00 00 00
    end_of_list

  Offset: 21, Index: 15
    view pair 1, 6

  Offset: 23, Index: 17
    offset_pair 34, 34
      .text+0x0000000000000034 <_Z29AudioVisualWaveformDrawSamplev+0x24>..
      .text+0x0000000000000033 <_Z29AudioVisualWaveformDrawSamplev+0x23>
        [ 0] implicit_pointer [   11f] +0
    end_of_list

  Offset: 2e, Index: 22
    view pair 3, 6

  Offset: 30, Index: 24
    offset_pair 34, 34
      .text+0x0000000000000034 <_Z29AudioVisualWaveformDrawSamplev+0x24>..
      .text+0x0000000000000033 <_Z29AudioVisualWaveformDrawSamplev+0x23>
        [ 0] implicit_value: 2 byte block: 00 04
    base_address 0x179a006343404
      0x000179a006343404
    end_of_list

Note that it isn't technically invalid DWARF, but the base_address is highly
unlikely to be correct.

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