dwarf_getlocation would return an error when it saw a
DW_OP_GNU_uninit. Handle it by simply recognizing as a no argument
operation.
DW_OP_GNU_uninit is emitted by GCC as a marker to flag the location
expression as referring to an uninitialized value.
Signed-off-by: Mark Wielaard <m...@klomp.org>
---
libdw/ChangeLog | 5 +++++
libdw/dwarf_getlocation.c | 1 +
tests/ChangeLog | 4 ++++
tests/varlocs.c | 6 ++++++
4 files changed, 16 insertions(+)
diff --git a/libdw/ChangeLog b/libdw/ChangeLog
index 71e96c88..9bea831e 100644
--- a/libdw/ChangeLog
+++ b/libdw/ChangeLog
@@ -1,3 +1,8 @@
+2023-02-10 Mark Wielaard <m...@klomp.org>
+
+ * dwarf_getlocation.c (__libdw_intern_expression): Handle
+ DW_OP_GNU_uninit.
+
2023-01-22 Mark Wielaard <m...@klomp.org>
* dwarf_getscopes.c (pc_record): Return nscopes when done.
diff --git a/libdw/dwarf_getlocation.c b/libdw/dwarf_getlocation.c
index d0d78163..553fdc98 100644
--- a/libdw/dwarf_getlocation.c
+++ b/libdw/dwarf_getlocation.c
@@ -396,6 +396,7 @@ __libdw_intern_expression (Dwarf *dbg, bool
other_byte_order,
case DW_OP_form_tls_address:
case DW_OP_GNU_push_tls_address:
case DW_OP_stack_value:
+ case DW_OP_GNU_uninit:
/* No operand. */
break;
diff --git a/tests/ChangeLog b/tests/ChangeLog
index 974a3a4f..fd261bc6 100644
--- a/tests/ChangeLog
+++ b/tests/ChangeLog
@@ -1,3 +1,7 @@
+2023-02-10 Mark Wielaard <m...@klomp.org>
+
+ * varlocs.c (print_expr): Handle DW_OP_GNU_uninit.
+
2023-02-03 Mark Wielaard <m...@klomp.org>
* run-addr2line-C-test.sh: Check ELFUTILS_DISABLE_DEMANGLE.
diff --git a/tests/varlocs.c b/tests/varlocs.c
index d2c13767..8e563fd3 100644
--- a/tests/varlocs.c
+++ b/tests/varlocs.c
@@ -251,6 +251,12 @@ print_expr (Dwarf_Attribute *attr, Dwarf_Op *expr,
Dwarf_Addr addr, int depth)
printf ("%s", opname);
break;
+ case DW_OP_GNU_uninit:
+ /* No arguments. Special. It means the expression describes
+ an value which hasn't been initialized (yet). */
+ printf ("%s", opname);
+ break;
+
case DW_OP_call_frame_cfa:
/* No arguments. Special. Pushes Call Frame Address as computed
by CFI data (dwarf_cfi_addrframe will fetch that info (either from
--
2.39.1
