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From: "fche at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: systemtap@sourceware.org
Subject: [Bug translator/31496] New: support DW_OP_bra (conditional branches)
 in dwarf location lists
Date: Fri, 15 Mar 2024 20:04:08 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D31496

            Bug ID: 31496
           Summary: support DW_OP_bra (conditional branches) in dwarf
                    location lists
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: translator
          Assignee: systemtap at sourceware dot org
          Reporter: fche at redhat dot com
  Target Milestone: ---

stap should support location lists such as:

 <8><1257ae4>: Abbrev Number: 15 (DW_TAG_call_site_parameter)
    <1257ae5>   DW_AT_location    : 1 byte block: 54    (DW_OP_reg4 (rsi))
    <1257ae7>   DW_AT_call_value  : 22 byte block: 9 ff 30 7d 0 8 20 24 30 =
29
28 1 0 16 13 b 60 fb 1a 23 c0 1b  (DW_OP_const1s: -1; DW_OP_lit0; DW_OP_bre=
g13
(r13): 0; DW_OP_const1u: 32; DW_OP_shl; DW_OP_lit0; DW_OP_eq; DW_OP_bra: 1;
DW_OP_swap; DW_OP_drop; DW_OP_const2s: -1184; DW_OP_and; DW_OP_plus_uconst:
3520)

(found in the fedora 38 6.4.15 kernel)

00449           case DW_OP_bra:=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20
00450             // ??? Could copy the stack, recurse, and place both=20=
=20=20=20=20=20=20=20=20=20
00451             // traces in arms of a ternary_expression.  No point=20=
=20=20=20=20=20=20=20=20=20
00452             // in doing that if this is never used, however.=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20
00453             DIE ("conditional branches not supported");=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
00454             break;=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20


https://issues.redhat.com/browse/RHEL-13009

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