Bug 388706

Summary:	warning: evaluate_Dwarf3_Expr: unhandled DW_OP_ 0xf2 (DW_OP_GNU_implicit_pointer)
Product:	[Developer tools] valgrind	Reporter:	vitaly.v.ch
Component:	memcheck	Assignee:	Julian Seward <jseward>
Status:	CONFIRMED ---
Severity:	normal	CC:	mark, tom
Priority:	NOR	Keywords:	usability
Version First Reported In:	3.11.0
Target Milestone:	---
Platform:	Ubuntu
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description vitaly.v.ch 2018-01-09 02:45:44 UTC

--29827-- warning: evaluate_Dwarf3_Expr: unhandled DW_OP_ 0xf2
--29827-- warning: evaluate_Dwarf3_Expr: unhandled DW_OP_ 0xf2
--29827-- warning: evaluate_Dwarf3_Expr: unhandled DW_OP_ 0xf2
--29827-- warning: evaluate_Dwarf3_Expr: unhandled DW_OP_ 0xf2
--29827-- warning: evaluate_Dwarf3_Expr: unhandled DW_OP_ 0xf2
--29827-- warning: evaluate_Dwarf3_Expr: unhandled DW_OP_ 0xf2
--29827-- warning: evaluate_Dwarf3_Expr: unhandled DW_OP_ 0xf2
--29827-- warning: evaluate_Dwarf3_Expr: unhandled DW_OP_ 0xf2
--29827-- warning: evaluate_Dwarf3_Expr: unhandled DW_OP_ 0xf2
--29827-- warning: evaluate_Dwarf3_Expr: unhandled DW_OP_ 0xf2
--29827-- warning: evaluate_Dwarf3_Expr: unhandled DW_OP_ 0xf2
--29827-- warning: evaluate_Dwarf3_Expr: unhandled DW_OP_ 0xf2
--29827-- warning: evaluate_Dwarf3_Expr: unhandled DW_OP_ 0xf2
--29827-- warning: evaluate_Dwarf3_Expr: unhandled DW_OP_ 0xf2
--29827-- warning: evaluate_Dwarf3_Expr: unhandled DW_OP_ 0xf2
--29827-- warning: evaluate_Dwarf3_Expr: unhandled DW_OP_ 0xf2
--29827-- warning: evaluate_Dwarf3_Expr: unhandled DW_OP_ 0xf2
--29827-- warning: evaluate_Dwarf3_Expr: unhandled DW_OP_ 0xf2
--29827-- warning: evaluate_Dwarf3_Expr: unhandled DW_OP_ 0xf2
--29827-- warning: evaluate_Dwarf3_Expr: unhandled DW_OP_ 0xf2
--29827-- warning: evaluate_Dwarf3_Expr: unhandled DW_OP_ 0xf2
--29827-- warning: evaluate_Dwarf3_Expr: unhandled DW_OP_ 0xf2

Comment 1 Mark Wielaard 2018-01-09 09:14:37 UTC

This is DW_OP_GNU_implicit_pointer.
Original description http://www.dwarfstd.org/ShowIssue.php?issue=100831.1-1&type=closed
DWARF5 adopted a variant DW_OP_implicit_pointer described at http://www.dwarfstd.org/ShowIssue.php?issue=100831.1&type=closed

Comment 2 Julian Seward 2018-08-06 07:43:08 UTC

(In reply to Mark Wielaard from comment #1)
> This is DW_OP_GNU_implicit_pointer.

Mark, do we need to be concerned about this, still?  I note it is
reported against 3.11.0.

Comment 3 Mark Wielaard 2021-01-27 12:01:29 UTC

This (and DW_OP_GNU_entry_value) are still not handled.
We are not seeing this in our testsuite because tests/filter_stderr_basic contains:

 # Suppress warnings from Dwarf reader
 sed '/warning: evaluate_Dwarf3_Expr: unhandled DW_OP_/d'

Note for DWARF5 these GNU extensions are standardized as DW_OP_implicit_pointer = 0xa0 and DW_OP_entry_value = 0xa3