Many lldb tests fail when the debug info format is set to PDB

[DavidSpickett]

Using the patch proposed in #149305, many tests fail on Windows. Testing with PDB instead of DWARF is not something we support right now but want for #24834.

********************
Unresolved Tests (5):
  lldb-api :: functionalities/data-formatter/data-formatter-stl/generic/string/TestDataFormatterStdString.py
  lldb-api :: lang/c/vla/TestVLA.py
  lldb-api :: python_api/frame/get-variables/TestGetVariables.py
  lldb-api :: python_api/process/TestProcessAPI.py
  lldb-api :: tools/lldb-dap/commands/TestDAP_commands.py

********************
Failed Tests (119):
  lldb-api :: commands/dwim-print/TestDWIMPrint.py
  lldb-api :: commands/expression/anonymous-struct/TestCallUserAnonTypedef.py
  lldb-api :: commands/expression/argument_passing_restrictions/TestArgumentPassingRestrictions.py
  lldb-api :: commands/expression/call-function/TestCallStdStringFunction.py
  lldb-api :: commands/expression/call-function/TestCallStopAndContinue.py
  lldb-api :: commands/expression/call-function/TestCallUserDefinedFunction.py
  lldb-api :: commands/expression/char/TestExprsChar.py
  lldb-api :: commands/expression/class_template_specialization_empty_pack/TestClassTemplateSpecializationParametersHandling.py
  lldb-api :: commands/expression/codegen-crash-typedefdecl-not-in_declcontext/TestCodegenCrashTypedefDeclNotInDeclContext.py
  lldb-api :: commands/expression/context-object/TestContextObject.py
  lldb-api :: commands/expression/deleting-implicit-copy-constructor/TestDeletingImplicitCopyConstructor.py
  lldb-api :: commands/expression/diagnostics/TestExprDiagnostics.py
  lldb-api :: commands/expression/expr_inside_lambda/TestExprInsideLambdas.py
  lldb-api :: commands/expression/formatters/TestFormatters.py
  lldb-api :: commands/expression/import_base_class_when_class_has_derived_member/TestImportBaseClassWhenClassHasDerivedMember.py
  lldb-api :: commands/expression/inline-namespace/TestInlineNamespace.py
  lldb-api :: commands/expression/namespace-alias/TestInlineNamespaceAlias.py
  lldb-api :: commands/expression/nested/TestNestedExpressions.py
  lldb-api :: commands/expression/no-deadlock/TestExprDoesntBlock.py
  lldb-api :: commands/expression/options/TestExprOptions.py
  lldb-api :: commands/expression/pr35310/TestExprsBug35310.py
  lldb-api :: commands/expression/rdar42038760/TestScalarURem.py
  lldb-api :: commands/expression/rdar44436068/Test128BitsInteger.py
  lldb-api :: commands/expression/static-initializers/TestStaticInitializers.py
  lldb-api :: commands/expression/test/TestExprs.py
  lldb-api :: commands/expression/unwind_expression/TestUnwindExpression.py
  lldb-api :: commands/expression/xvalue/TestXValuePrinting.py
  lldb-api :: commands/frame/recognizer/TestFrameRecognizer.py
  lldb-api :: commands/frame/var-dil/basics/NoDebugInfo/TestFrameVarDILNoDebugInfo.py
  lldb-api :: commands/platform/launchgdbserver/TestPlatformLaunchGDBServer.py
  lldb-api :: functionalities/breakpoint/breakpoint_by_line_and_column/TestBreakpointByLineAndColumn.py
  lldb-api :: functionalities/breakpoint/breakpoint_ids/TestBreakpointIDs.py
  lldb-api :: functionalities/breakpoint/breakpoint_language/TestBreakpointLanguage.py
  lldb-api :: functionalities/breakpoint/breakpoint_on_overload/TestBreakOnOverload.py
  lldb-api :: functionalities/breakpoint/breakpoint_options/TestBreakpointOptions.py
  lldb-api :: functionalities/data-formatter/data-formatter-cpp/TestDataFormatterCpp.py
  lldb-api :: functionalities/data-formatter/data-formatter-ptr-matching/TestDataFormatterPtrMatching.py
  lldb-api :: functionalities/data-formatter/data-formatter-skip-summary/TestDataFormatterSkipSummary.py
  lldb-api :: functionalities/data-formatter/data-formatter-stl/generic/forward_list/TestDataFormatterGenericForwardList.py
  lldb-api :: functionalities/data-formatter/data-formatter-stl/generic/list/TestDataFormatterGenericList.py
  lldb-api :: functionalities/data-formatter/data-formatter-stl/generic/shared_ptr/TestDataFormatterStdSharedPtr.py
  lldb-api :: functionalities/data-formatter/data-formatter-stl/generic/tuple/TestDataFormatterStdTuple.py
  lldb-api :: functionalities/data-formatter/data-formatter-stl/generic/u8string/TestDataFormatterStdU8String.py
  lldb-api :: functionalities/data-formatter/data-formatter-stl/generic/unique_ptr/TestDataFormatterStdUniquePtr.py
  lldb-api :: functionalities/data-formatter/ptr_ref_typedef/TestPtrRef2Typedef.py
  lldb-api :: functionalities/data-formatter/special-chars/TestSummaryStringSpecialChars.py
  lldb-api :: functionalities/data-formatter/stringprinter/TestStringPrinter.py
  lldb-api :: functionalities/data-formatter/typedef_array/TestTypedefArray.py
  lldb-api :: functionalities/data-formatter/var-in-aggregate-misuse/TestVarInAggregateMisuse.py
  lldb-api :: functionalities/data-formatter/varscript_formatting/TestDataFormatterVarScriptFormatting.py
  lldb-api :: functionalities/data-formatter/vector-types/TestVectorTypesFormatting.py
  lldb-api :: functionalities/inline-stepping/TestInlineStepping.py
  lldb-api :: functionalities/location-list-lookup/TestLocationListLookup.py
  lldb-api :: functionalities/memory/find/TestMemoryFind.py
  lldb-api :: functionalities/multiple-slides/TestMultipleSlides.py
  lldb-api :: functionalities/optimized_code/TestNoASanExceptionAfterEvalOP_piece.py
  lldb-api :: functionalities/return-value/TestReturnValue.py
  lldb-api :: functionalities/target_var/TestTargetVar.py
  lldb-api :: functionalities/type_find_first/TestFindFirstType.py
  lldb-api :: functionalities/type_get_module/TestTypeGetModule.py
  lldb-api :: functionalities/type_types/TestFindTypes.py
  lldb-api :: functionalities/unused-inlined-parameters/TestUnusedInlinedParameters.py
  lldb-api :: lang/c/enum_types/TestEnumTypes.py
  lldb-api :: lang/c/fpeval/TestFPEval.py
  lldb-api :: lang/c/inlines/TestRedefinitionsInInlines.py
  lldb-api :: lang/c/local_variables/TestLocalVariables.py
  lldb-api :: lang/c/set_values/TestSetValues.py
  lldb-api :: lang/c/shared_lib/TestSharedLib.py
  lldb-api :: lang/c/struct_types/TestStructTypes.py
  lldb-api :: lang/c/unicode/TestUnicodeSymbols.py
  lldb-api :: lang/cpp/break-on-initializers/TestBreakOnCPP11Initializers.py
  lldb-api :: lang/cpp/breakpoint-commands/TestCPPBreakpointCommands.py
  lldb-api :: lang/cpp/call-function/TestCallCPPFunction.py
  lldb-api :: lang/cpp/chained-calls/TestCppChainedCalls.py
  lldb-api :: lang/cpp/class-template-parameter-pack/TestClassTemplateParameterPack.py
  lldb-api :: lang/cpp/class-template-parameter-pack/TestTemplatePackArgs.py
  lldb-api :: lang/cpp/class_static/TestStaticVariables.py
  lldb-api :: lang/cpp/const_static_integral_member/TestConstStaticIntegralMember.py
  lldb-api :: lang/cpp/const_static_integral_member_int128/TestConstStaticIntegralMemberInt128.py
  lldb-api :: lang/cpp/constructors/TestCppConstructors.py
  lldb-api :: lang/cpp/dereferencing_references/TestCPPDereferencingReferences.py
  lldb-api :: lang/cpp/enum_promotion/TestCPPEnumPromotion.py
  lldb-api :: lang/cpp/extern_c/TestExternCSymbols.py
  lldb-api :: lang/cpp/forward/TestCPPForwardDeclaration.py
  lldb-api :: lang/cpp/function-qualifiers/TestCppFunctionQualifiers.py
  lldb-api :: lang/cpp/function-ref-qualifiers/TestCppFunctionRefQualifiers.py
  lldb-api :: lang/cpp/global_operators/TestCppGlobalOperators.py
  lldb-api :: lang/cpp/global_variables/TestCPPGlobalVariables.py
  lldb-api :: lang/cpp/incompatible-class-templates/TestCppIncompatibleClassTemplates.py
  lldb-api :: lang/cpp/llvm-style/TestLLVMStyle.py
  lldb-api :: lang/cpp/multiple-inheritance/TestCppMultipleInheritance.py
  lldb-api :: lang/cpp/namespace/TestNamespace.py
  lldb-api :: lang/cpp/namespace/TestNamespaceLookup.py
  lldb-api :: lang/cpp/namespace_conflicts/TestNamespaceConflicts.py
  lldb-api :: lang/cpp/nested-template/TestNestedTemplate.py
  lldb-api :: lang/cpp/nsimport/TestCppNsImport.py
  lldb-api :: lang/cpp/operators/TestCppOperators.py
  lldb-api :: lang/cpp/overloaded-functions/TestOverloadedFunctions.py
  lldb-api :: lang/cpp/preferred_name/TestPreferredName.py
  lldb-api :: lang/cpp/rvalue-references/TestRvalueReferences.py
  lldb-api :: lang/cpp/static_methods/TestCPPStaticMethods.py
  lldb-api :: lang/cpp/step-through-trampoline/TestStepThroughTrampoline.py
  lldb-api :: lang/cpp/stl/TestSTL.py
  lldb-api :: lang/cpp/structured-binding/TestStructuredBinding.py
  lldb-api :: lang/cpp/template-specialization-type/TestTemplateSpecializationType.py
  lldb-api :: lang/cpp/template/TestTemplateArgs.py
  lldb-api :: lang/cpp/type_lookup/TestCppTypeLookup.py
  lldb-api :: lang/cpp/type_lookup_duplicate/TestCppTypeLookupDuplicate.py
  lldb-api :: lang/cpp/typedef-to-outer-fwd/TestTypedefToOuterFwd.py
  lldb-api :: lang/cpp/typedef/TestCppTypedef.py
  lldb-api :: lang/cpp/unique-types2/TestUniqueTypes2.py
  lldb-api :: lang/cpp/unsigned_types/TestUnsignedTypes.py
  lldb-api :: lang/mixed/TestMixedLanguages.py
  lldb-api :: macosx/duplicate-archive-members/TestDuplicateMembers.py
  lldb-api :: python_api/frame/inlines/TestInlinedFrame.py
  lldb-api :: python_api/sbmodule/FindTypes/TestSBModuleFindTypes.py
  lldb-api :: python_api/target/TestTargetAPI.py
  lldb-api :: python_api/thread/TestThreadAPI.py
  lldb-api :: python_api/type/TestTypeList.py

********************
Unexpectedly Passed Tests (2):
  lldb-api :: lang/cpp/function_refs/TestFunctionRefs.py
  lldb-api :: lang/cpp/reference-to-outer-type/TestCppReferenceToOuterClass.py


Testing Time: 801.33s

Total Discovered Tests: 1288
  Unsupported        : 670 (52.02%)
  Passed             : 482 (37.42%)
  Expectedly Failed  :  10 (0.78%)
  Unresolved         :   5 (0.39%)
  Failed             : 119 (9.24%)
  Unexpectedly Passed:   2 (0.16%)

If we want to run all debug info tests with PDB as well, these need to be investigated. In the meantime perhaps we can opt-in known good tests.

[llvmbot]

@llvm/issue-subscribers-lldb

Author: David Spickett (DavidSpickett)

Using the patch proposed in https://github.com//pull/149305, many tests fail on Windows. Which is not something we support right now but want for https://github.com//issues/24834.

********************
Unresolved Tests (5):
  lldb-api :: functionalities/data-formatter/data-formatter-stl/generic/string/TestDataFormatterStdString.py
  lldb-api :: lang/c/vla/TestVLA.py
  lldb-api :: python_api/frame/get-variables/TestGetVariables.py
  lldb-api :: python_api/process/TestProcessAPI.py
  lldb-api :: tools/lldb-dap/commands/TestDAP_commands.py

********************
Failed Tests (119):
  lldb-api :: commands/dwim-print/TestDWIMPrint.py
  lldb-api :: commands/expression/anonymous-struct/TestCallUserAnonTypedef.py
  lldb-api :: commands/expression/argument_passing_restrictions/TestArgumentPassingRestrictions.py
  lldb-api :: commands/expression/call-function/TestCallStdStringFunction.py
  lldb-api :: commands/expression/call-function/TestCallStopAndContinue.py
  lldb-api :: commands/expression/call-function/TestCallUserDefinedFunction.py
  lldb-api :: commands/expression/char/TestExprsChar.py
  lldb-api :: commands/expression/class_template_specialization_empty_pack/TestClassTemplateSpecializationParametersHandling.py
  lldb-api :: commands/expression/codegen-crash-typedefdecl-not-in_declcontext/TestCodegenCrashTypedefDeclNotInDeclContext.py
  lldb-api :: commands/expression/context-object/TestContextObject.py
  lldb-api :: commands/expression/deleting-implicit-copy-constructor/TestDeletingImplicitCopyConstructor.py
  lldb-api :: commands/expression/diagnostics/TestExprDiagnostics.py
  lldb-api :: commands/expression/expr_inside_lambda/TestExprInsideLambdas.py
  lldb-api :: commands/expression/formatters/TestFormatters.py
  lldb-api :: commands/expression/import_base_class_when_class_has_derived_member/TestImportBaseClassWhenClassHasDerivedMember.py
  lldb-api :: commands/expression/inline-namespace/TestInlineNamespace.py
  lldb-api :: commands/expression/namespace-alias/TestInlineNamespaceAlias.py
  lldb-api :: commands/expression/nested/TestNestedExpressions.py
  lldb-api :: commands/expression/no-deadlock/TestExprDoesntBlock.py
  lldb-api :: commands/expression/options/TestExprOptions.py
  lldb-api :: commands/expression/pr35310/TestExprsBug35310.py
  lldb-api :: commands/expression/rdar42038760/TestScalarURem.py
  lldb-api :: commands/expression/rdar44436068/Test128BitsInteger.py
  lldb-api :: commands/expression/static-initializers/TestStaticInitializers.py
  lldb-api :: commands/expression/test/TestExprs.py
  lldb-api :: commands/expression/unwind_expression/TestUnwindExpression.py
  lldb-api :: commands/expression/xvalue/TestXValuePrinting.py
  lldb-api :: commands/frame/recognizer/TestFrameRecognizer.py
  lldb-api :: commands/frame/var-dil/basics/NoDebugInfo/TestFrameVarDILNoDebugInfo.py
  lldb-api :: commands/platform/launchgdbserver/TestPlatformLaunchGDBServer.py
  lldb-api :: functionalities/breakpoint/breakpoint_by_line_and_column/TestBreakpointByLineAndColumn.py
  lldb-api :: functionalities/breakpoint/breakpoint_ids/TestBreakpointIDs.py
  lldb-api :: functionalities/breakpoint/breakpoint_language/TestBreakpointLanguage.py
  lldb-api :: functionalities/breakpoint/breakpoint_on_overload/TestBreakOnOverload.py
  lldb-api :: functionalities/breakpoint/breakpoint_options/TestBreakpointOptions.py
  lldb-api :: functionalities/data-formatter/data-formatter-cpp/TestDataFormatterCpp.py
  lldb-api :: functionalities/data-formatter/data-formatter-ptr-matching/TestDataFormatterPtrMatching.py
  lldb-api :: functionalities/data-formatter/data-formatter-skip-summary/TestDataFormatterSkipSummary.py
  lldb-api :: functionalities/data-formatter/data-formatter-stl/generic/forward_list/TestDataFormatterGenericForwardList.py
  lldb-api :: functionalities/data-formatter/data-formatter-stl/generic/list/TestDataFormatterGenericList.py
  lldb-api :: functionalities/data-formatter/data-formatter-stl/generic/shared_ptr/TestDataFormatterStdSharedPtr.py
  lldb-api :: functionalities/data-formatter/data-formatter-stl/generic/tuple/TestDataFormatterStdTuple.py
  lldb-api :: functionalities/data-formatter/data-formatter-stl/generic/u8string/TestDataFormatterStdU8String.py
  lldb-api :: functionalities/data-formatter/data-formatter-stl/generic/unique_ptr/TestDataFormatterStdUniquePtr.py
  lldb-api :: functionalities/data-formatter/ptr_ref_typedef/TestPtrRef2Typedef.py
  lldb-api :: functionalities/data-formatter/special-chars/TestSummaryStringSpecialChars.py
  lldb-api :: functionalities/data-formatter/stringprinter/TestStringPrinter.py
  lldb-api :: functionalities/data-formatter/typedef_array/TestTypedefArray.py
  lldb-api :: functionalities/data-formatter/var-in-aggregate-misuse/TestVarInAggregateMisuse.py
  lldb-api :: functionalities/data-formatter/varscript_formatting/TestDataFormatterVarScriptFormatting.py
  lldb-api :: functionalities/data-formatter/vector-types/TestVectorTypesFormatting.py
  lldb-api :: functionalities/inline-stepping/TestInlineStepping.py
  lldb-api :: functionalities/location-list-lookup/TestLocationListLookup.py
  lldb-api :: functionalities/memory/find/TestMemoryFind.py
  lldb-api :: functionalities/multiple-slides/TestMultipleSlides.py
  lldb-api :: functionalities/optimized_code/TestNoASanExceptionAfterEvalOP_piece.py
  lldb-api :: functionalities/return-value/TestReturnValue.py
  lldb-api :: functionalities/target_var/TestTargetVar.py
  lldb-api :: functionalities/type_find_first/TestFindFirstType.py
  lldb-api :: functionalities/type_get_module/TestTypeGetModule.py
  lldb-api :: functionalities/type_types/TestFindTypes.py
  lldb-api :: functionalities/unused-inlined-parameters/TestUnusedInlinedParameters.py
  lldb-api :: lang/c/enum_types/TestEnumTypes.py
  lldb-api :: lang/c/fpeval/TestFPEval.py
  lldb-api :: lang/c/inlines/TestRedefinitionsInInlines.py
  lldb-api :: lang/c/local_variables/TestLocalVariables.py
  lldb-api :: lang/c/set_values/TestSetValues.py
  lldb-api :: lang/c/shared_lib/TestSharedLib.py
  lldb-api :: lang/c/struct_types/TestStructTypes.py
  lldb-api :: lang/c/unicode/TestUnicodeSymbols.py
  lldb-api :: lang/cpp/break-on-initializers/TestBreakOnCPP11Initializers.py
  lldb-api :: lang/cpp/breakpoint-commands/TestCPPBreakpointCommands.py
  lldb-api :: lang/cpp/call-function/TestCallCPPFunction.py
  lldb-api :: lang/cpp/chained-calls/TestCppChainedCalls.py
  lldb-api :: lang/cpp/class-template-parameter-pack/TestClassTemplateParameterPack.py
  lldb-api :: lang/cpp/class-template-parameter-pack/TestTemplatePackArgs.py
  lldb-api :: lang/cpp/class_static/TestStaticVariables.py
  lldb-api :: lang/cpp/const_static_integral_member/TestConstStaticIntegralMember.py
  lldb-api :: lang/cpp/const_static_integral_member_int128/TestConstStaticIntegralMemberInt128.py
  lldb-api :: lang/cpp/constructors/TestCppConstructors.py
  lldb-api :: lang/cpp/dereferencing_references/TestCPPDereferencingReferences.py
  lldb-api :: lang/cpp/enum_promotion/TestCPPEnumPromotion.py
  lldb-api :: lang/cpp/extern_c/TestExternCSymbols.py
  lldb-api :: lang/cpp/forward/TestCPPForwardDeclaration.py
  lldb-api :: lang/cpp/function-qualifiers/TestCppFunctionQualifiers.py
  lldb-api :: lang/cpp/function-ref-qualifiers/TestCppFunctionRefQualifiers.py
  lldb-api :: lang/cpp/global_operators/TestCppGlobalOperators.py
  lldb-api :: lang/cpp/global_variables/TestCPPGlobalVariables.py
  lldb-api :: lang/cpp/incompatible-class-templates/TestCppIncompatibleClassTemplates.py
  lldb-api :: lang/cpp/llvm-style/TestLLVMStyle.py
  lldb-api :: lang/cpp/multiple-inheritance/TestCppMultipleInheritance.py
  lldb-api :: lang/cpp/namespace/TestNamespace.py
  lldb-api :: lang/cpp/namespace/TestNamespaceLookup.py
  lldb-api :: lang/cpp/namespace_conflicts/TestNamespaceConflicts.py
  lldb-api :: lang/cpp/nested-template/TestNestedTemplate.py
  lldb-api :: lang/cpp/nsimport/TestCppNsImport.py
  lldb-api :: lang/cpp/operators/TestCppOperators.py
  lldb-api :: lang/cpp/overloaded-functions/TestOverloadedFunctions.py
  lldb-api :: lang/cpp/preferred_name/TestPreferredName.py
  lldb-api :: lang/cpp/rvalue-references/TestRvalueReferences.py
  lldb-api :: lang/cpp/static_methods/TestCPPStaticMethods.py
  lldb-api :: lang/cpp/step-through-trampoline/TestStepThroughTrampoline.py
  lldb-api :: lang/cpp/stl/TestSTL.py
  lldb-api :: lang/cpp/structured-binding/TestStructuredBinding.py
  lldb-api :: lang/cpp/template-specialization-type/TestTemplateSpecializationType.py
  lldb-api :: lang/cpp/template/TestTemplateArgs.py
  lldb-api :: lang/cpp/type_lookup/TestCppTypeLookup.py
  lldb-api :: lang/cpp/type_lookup_duplicate/TestCppTypeLookupDuplicate.py
  lldb-api :: lang/cpp/typedef-to-outer-fwd/TestTypedefToOuterFwd.py
  lldb-api :: lang/cpp/typedef/TestCppTypedef.py
  lldb-api :: lang/cpp/unique-types2/TestUniqueTypes2.py
  lldb-api :: lang/cpp/unsigned_types/TestUnsignedTypes.py
  lldb-api :: lang/mixed/TestMixedLanguages.py
  lldb-api :: macosx/duplicate-archive-members/TestDuplicateMembers.py
  lldb-api :: python_api/frame/inlines/TestInlinedFrame.py
  lldb-api :: python_api/sbmodule/FindTypes/TestSBModuleFindTypes.py
  lldb-api :: python_api/target/TestTargetAPI.py
  lldb-api :: python_api/thread/TestThreadAPI.py
  lldb-api :: python_api/type/TestTypeList.py

********************
Unexpectedly Passed Tests (2):
  lldb-api :: lang/cpp/function_refs/TestFunctionRefs.py
  lldb-api :: lang/cpp/reference-to-outer-type/TestCppReferenceToOuterClass.py


Testing Time: 801.33s

Total Discovered Tests: 1288
  Unsupported        : 670 (52.02%)
  Passed             : 482 (37.42%)
  Expectedly Failed  :  10 (0.78%)
  Unresolved         :   5 (0.39%)
  Failed             : 119 (9.24%)
  Unexpectedly Passed:   2 (0.16%)

If we want to run all debug info tests with PDB as well, these need to be investigated. In the meantime perhaps we can opt-in known good tests.

[Michael137]

From my limited understanding of PDB it sounded like template parameter info is not encoded? Which makes a lot of our template related tests (and data formatters) expectedly not work. I'm not sure what we could do about that. Stepping back, I'm guessing the only reason we would want to add first-class support for PDB is that it's the default of clang-cl on Windows (is that even true?)?

[DavidSpickett]

Stepping back, I'm guessing the only reason we would want to add first-class support for PDB is that it's the default of clang-cl on Windows (is that even true?)?

Yes either using full llvm with clang-cl, or all MSVC with lldb as the debugger. I have no data on how common the latter is, or requests to pursue this, so it's purely theoretical right now.

I raised this to make it clear that "full" PDB support is a different task to making a few formatters also work with PDB. So we may "not planned" this issue in the end.

Yes, clang-cl with -g or /Zi emits PDB.

[Nerixyz]

From my limited understanding of PDB it sounded like template parameter info is not encoded? Which makes a lot of our template related tests (and data formatters) expectedly not work. I'm not sure what we could do about that.

Templates and typedefs are essentially missing. For templates, it might be possible to use the mangled name (at least for record types). This won't support compiler generated types like lambdas (or maybe these have some unique id?). As for typedefs, I think PDB can represent them, but names of records or function parameter types will have the "resolved" type name, so it's non-trivial to map that back.

---

One other issue with the current native PDB parser is that functions can't be called, which causes many of the expression tests to fail (#51933). I looked a bit at that, and I can now call functions without parameters, but I'll focus on the STL formatters right now.