clayborg wrote:
This is causing a clang assertion due:
```
(lldb) type lookup std::ios_base
Assertion failed: (DD && "queried property of class with no definition"),
function data, file DeclCXX.h, line 464.
bt
(lldb) bt
* thread #1, queue = 'com.apple.main-thread', stop reason = hit program assert
frame #0: 0x0000000180acaa60 libsystem_kernel.dylib`__pthread_kill + 8
frame #1: 0x0000000180b02c20 libsystem_pthread.dylib`pthread_kill + 288
frame #2: 0x0000000180a0fa20 libsystem_c.dylib`abort + 180
frame #3: 0x0000000180a0ed10 libsystem_c.dylib`__assert_rtn + 284
frame #4: 0x000000012223ba64
LLDB`clang::CXXRecordDecl::data(this=0x0000000119ec5518) const at
DeclCXX.h:464:5
frame #5: 0x00000001223b7914
LLDB`clang::CXXRecordDecl::hasUserDeclaredMoveConstructor(this=0x0000000119ec5518)
const at DeclCXX.h:858:12
frame #6: 0x0000000122399c0c
LLDB`lldb_private::TypeSystemClang::CompleteTagDeclarationDefinition(type=0x000000050296fd10)
at TypeSystemClang.cpp:8370:28
* frame #7: 0x000000012222e4ac
LLDB`DWARFASTParserClang::CompleteRecordType(this=0x000000050296faa0,
die=0x00000001761932d0 0x00000004be848030 (0x000000000090cdd5),
type=0x000000050296fca0, clang_type=0x000000050296fd10) at
DWARFASTParserClang.cpp:2291:3
frame #8: 0x000000012222f150
LLDB`DWARFASTParserClang::CompleteTypeFromDWARF(this=0x000000050296faa0,
die=0x00000001761932d0 0x00000004be848030 (0x000000000090cdd5),
type=0x000000050296fca0, clang_type=0x000000050296fd10) at
DWARFASTParserClang.cpp:2356:12
frame #9: 0x00000001222b6eac
LLDB`lldb_private::plugin::dwarf::SymbolFileDWARF::CompleteType(this=0x000000011912e218,
compiler_type=0x000000050296fd10) at SymbolFileDWARF.cpp:1659:23
frame #10: 0x00000001218952e0
LLDB`lldb_private::Type::ResolveCompilerType(this=0x000000050296fca0,
compiler_type_resolve_state=Full) at Type.cpp:715:24
frame #11: 0x0000000121895520
LLDB`lldb_private::Type::GetFullCompilerType(this=0x000000050296fca0) at
Type.cpp:755:3
frame #12: 0x00000001218e49c8
LLDB`lldb_private::Language::ImageListTypeScavenger::Find_Impl(this=0x0000000118ebd000,
exe_scope=0x000000011a810e00, key="std::ios_base", results=size=0) at
Language.cpp:473:43
frame #13: 0x00000001218e47f8
LLDB`lldb_private::Language::TypeScavenger::Find(this=0x0000000118ebd000,
exe_scope=0x000000011a810e00, key="std::ios_base", results=size=0, append=true)
at Language.cpp:456:13
frame #14: 0x000000012418c958
LLDB`CommandObjectTypeLookup::DoExecute(this=0x0000000118e7a200,
raw_command_line="std::ios_base", result=0x000000016fdfe2f0) at
CommandObjectType.cpp:2667:24
frame #15: 0x000000012175fe3c
LLDB`lldb_private::CommandObjectRaw::Execute(this=0x0000000118e7a200,
args_string="std::ios_base", result=0x000000016fdfe2f0) at
CommandObject.cpp:850:7
frame #16: 0x0000000121733c74
LLDB`lldb_private::CommandInterpreter::HandleCommand(this=0x0000000100739130,
command_line="type lookup std::ios_base",
lazy_add_to_history=eLazyBoolCalculate, result=0x000000016fdfe2f0,
force_repeat_command=false) at CommandInterpreter.cpp:2038:14
frame #17: 0x0000000121738594
LLDB`lldb_private::CommandInterpreter::IOHandlerInputComplete(this=0x0000000100739130,
io_handler=0x0000000118eb5918, line="type lookup std::ios_base") at
CommandInterpreter.cpp:3118:3
frame #18: 0x00000001214c9004
LLDB`lldb_private::IOHandlerEditline::Run(this=0x0000000118eb5918) at
IOHandler.cpp:600:22
frame #19: 0x000000012145982c
LLDB`lldb_private::Debugger::RunIOHandlers(this=0x000000010185fe00) at
Debugger.cpp:1092:16
frame #20: 0x0000000121739bc4
LLDB`lldb_private::CommandInterpreter::RunCommandInterpreter(this=0x0000000100739130,
options=0x0000000118e94340) at CommandInterpreter.cpp:3380:16
frame #21: 0x00000001211496f0
LLDB`lldb::SBDebugger::RunCommandInterpreter(this=0x000000016fdfeb90,
options=0x000000016fdfe878) at SBDebugger.cpp:1288:14
frame #22: 0x0000000100006338
lldb`Driver::MainLoop(this=0x000000016fdfeb70) at Driver.cpp:558:20
frame #23: 0x0000000100006e54 lldb`main(argc=7, argv=0x000000016fdff308) at
Driver.cpp:807:26
frame #24: 0x000000018077a0e0 dyld`start + 2360
```
The DIE being passed to `DWARFASTParserClang::CompleteRecordType()` looks like:
```
0x0090cdbf: DW_TAG_compile_unit
DW_AT_producer ("clang version 15.0.7
(mononoke://mononoke.internal.tfbnw.net/fbsource
79a342ef1fab2184ef28a1c26022c7cbaec90e83)")
DW_AT_language (DW_LANG_C_plus_plus_14)
DW_AT_name ("fbcode/folly/detail/UniqueInstance.cpp")
DW_AT_dwo_name
("buck-out/v2/gen/fbcode/0765d56217397ee3/hphp/hhvm/__hhvm_link__/libunique_instance.a/UniqueInstance.cpp.o.opt.o")
0x0090cdc7: DW_TAG_namespace
DW_AT_name ("std")
0x0090cdd5: DW_TAG_class_type
DW_AT_name ("ios_base")
DW_AT_declaration (true)
0x0090cdd7: DW_TAG_class_type
DW_AT_name ("Init")
DW_AT_declaration (true)
0x0090cdda: DW_TAG_typedef
DW_AT_type (0x0090ce4e "std::_Ios_Seekdir")
DW_AT_name ("seekdir")
DW_AT_decl_file (0x11)
DW_AT_decl_line (479)
0x0090cde4: DW_TAG_typedef
DW_AT_type (0x0090ce45 "std::_Ios_Openmode")
DW_AT_name ("openmode")
DW_AT_decl_file (0x11)
DW_AT_decl_line (447)
0x0090cdee: DW_TAG_typedef
DW_AT_type (0x0090ce3c "std::_Ios_Iostate")
DW_AT_name ("iostate")
DW_AT_decl_file (0x11)
DW_AT_decl_line (416)
0x0090cdf8: NULL
```
So this DIE is just a declaration. Shouldn't this code have tried to find a non
declaration DIE for "std::ios_base"?
https://github.com/llvm/llvm-project/pull/90663
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