https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91997
Bug ID: 91997
Summary: pretty printers: The __node_type type alias _Hashtable
is not available
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: rafael at espindo dot la
Target Milestone: ---
At least when compiling with optimizations with
gcc (GCC) 8.3.1 20190223 (Red Hat 8.3.1-2)
the debug info doesn't include the type alias
using __node_type = __detail::_Hash_node<_Value, __hash_cached::value>
Which causes the pretty printer to fail with
-----------------------------------------------------
Traceback (most recent call last):
File "/home/espindola/scylla/gdb-printers/libstdcxx/v6/printers.py", line
966, in children
data = self.flatten (imap (self.format_one, StdHashtableIterator
(self.hashtable())))
File "/home/espindola/scylla/gdb-printers/libstdcxx/v6/printers.py", line
889, in __init__
self.node_type = find_type(hash.type, '__node_type').pointer()
File "/home/espindola/scylla/gdb-printers/libstdcxx/v6/printers.py", line 97,
in find_type
field = typ.fields()[0]
IndexError: list index out of range
-----------------------------------------------------
To work around that the pretty printer should reconstruct the type.
The best I was able to come up with was
- self.node_type = find_type(hash.type, '__node_type').pointer()
+ pair_name = hash.type.template_argument(1).name
+ traits_type = hash.type.template_argument(9)
+ cached = str(traits_type.template_argument(0)).lower()
+ node_name = '::std::__detail::_Hash_node<%s,%s>' % (pair_name, cached)
+ self.node_type = gdb.lookup_type(node_name).pointer()
