[lldb][DWARF] Remove obsolete calls to Supports_DW_AT_APPLE_objc_complete_type and DW_AT_decl_file_attributes_are_invalid (llvm#120226)

Depends on llvm#120225

With `llvm-gcc` support being removed from LLDB, these APIs
are now trivial and can be removed too.

(cherry picked from commit f176388)

Author: Michael137

lldb/source/Plugins/SymbolFile/DWARF/DWARFASTParserClang.cpp

@@ -1859,8 +1859,7 @@ DWARFASTParserClang::ParseStructureLikeDIE(const SymbolContext &sc,
 
   if ((attrs.class_language == eLanguageTypeObjC ||
        attrs.class_language == eLanguageTypeObjC_plus_plus) &&
-      !attrs.is_complete_objc_class &&
-      die.Supports_DW_AT_APPLE_objc_complete_type()) {
+      !attrs.is_complete_objc_class) {
     // We have a valid eSymbolTypeObjCClass class symbol whose name
     // matches the current objective C class that we are trying to find
     // and this DIE isn't the complete definition (we checked

lldb/source/Plugins/SymbolFile/DWARF/DWARFBaseDIE.cpp

@@ -107,10 +107,6 @@ bool DWARFBaseDIE::HasChildren() const {
   return m_die && m_die->HasChildren();
 }
 
-bool DWARFBaseDIE::Supports_DW_AT_APPLE_objc_complete_type() const {
-  return IsValid() && GetDWARF()->Supports_DW_AT_APPLE_objc_complete_type(m_cu);
-}
-
 DWARFAttributes DWARFBaseDIE::GetAttributes(Recurse recurse) const {
   if (IsValid())
     return m_die->GetAttributes(m_cu, recurse);

lldb/source/Plugins/SymbolFile/DWARF/DWARFUnit.cpp

@@ -734,10 +734,6 @@ bool DWARFUnit::LinkToSkeletonUnit(DWARFUnit &skeleton_unit) {
   return false; // Already linked to a different unit.
 }
 
-bool DWARFUnit::Supports_DW_AT_APPLE_objc_complete_type() { return true; }
-
-bool DWARFUnit::DW_AT_decl_file_attributes_are_invalid() { return false; }
-
 bool DWARFUnit::Supports_unnamed_objc_bitfields() {
   if (GetProducer() == eProducerClang)
     return GetProducerVersion() >= llvm::VersionTuple(425, 0, 13);

lldb/source/Plugins/SymbolFile/DWARF/DWARFUnit.h

@@ -171,10 +171,6 @@ class DWARFUnit : public UserID {
 
   bool LinkToSkeletonUnit(DWARFUnit &skeleton_unit);
 
-  bool Supports_DW_AT_APPLE_objc_complete_type();
-
-  bool DW_AT_decl_file_attributes_are_invalid();
-
   bool Supports_unnamed_objc_bitfields();
 
   SymbolFileDWARF &GetSymbolFileDWARF() const { return m_dwarf; }

lldb/source/Plugins/SymbolFile/DWARF/DebugNamesDWARFIndex.cpp

@@ -271,11 +271,6 @@ void DebugNamesDWARFIndex::GetCompleteObjCClass(
       // Report invalid
       continue;
     }
-    DWARFUnit *cu = die.GetCU();
-    if (!cu->Supports_DW_AT_APPLE_objc_complete_type()) {
-      incomplete_types.push_back(die);
-      continue;
-    }
 
     if (die.GetAttributeValueAsUnsigned(DW_AT_APPLE_objc_complete_type, 0)) {
       // If we find the complete version we're done.

lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp

@@ -472,8 +472,7 @@ SymbolFileDWARF::SymbolFileDWARF(ObjectFileSP objfile_sp,
     : SymbolFileCommon(std::move(objfile_sp)), m_debug_map_module_wp(),
       m_debug_map_symfile(nullptr),
       m_context(m_objfile_sp->GetModule()->GetSectionList(), dwo_section_list),
-      m_fetched_external_modules(false),
-      m_supports_DW_AT_APPLE_objc_complete_type(eLazyBoolCalculate) {}
+      m_fetched_external_modules(false) {}
 
 SymbolFileDWARF::~SymbolFileDWARF() = default;
 
@@ -3072,37 +3071,6 @@ Symbol *SymbolFileDWARF::GetObjCClassSymbol(ConstString objc_class_name) {
   return objc_class_symbol;
 }
 
-// Some compilers don't emit the DW_AT_APPLE_objc_complete_type attribute. If
-// they don't then we can end up looking through all class types for a complete
-// type and never find the full definition. We need to know if this attribute
-// is supported, so we determine this here and cache th result. We also need to
-// worry about the debug map
-// DWARF file
-// if we are doing darwin DWARF in .o file debugging.
-bool SymbolFileDWARF::Supports_DW_AT_APPLE_objc_complete_type(DWARFUnit *cu) {
-  if (m_supports_DW_AT_APPLE_objc_complete_type == eLazyBoolCalculate) {
-    m_supports_DW_AT_APPLE_objc_complete_type = eLazyBoolNo;
-    if (cu && cu->Supports_DW_AT_APPLE_objc_complete_type())
-      m_supports_DW_AT_APPLE_objc_complete_type = eLazyBoolYes;
-    else {
-      DWARFDebugInfo &debug_info = DebugInfo();
-      const uint32_t num_compile_units = GetNumCompileUnits();
-      for (uint32_t cu_idx = 0; cu_idx < num_compile_units; ++cu_idx) {
-        DWARFUnit *dwarf_cu = debug_info.GetUnitAtIndex(cu_idx);
-        if (dwarf_cu != cu &&
-            dwarf_cu->Supports_DW_AT_APPLE_objc_complete_type()) {
-          m_supports_DW_AT_APPLE_objc_complete_type = eLazyBoolYes;
-          break;
-        }
-      }
-    }
-    if (m_supports_DW_AT_APPLE_objc_complete_type == eLazyBoolNo &&
-        GetDebugMapSymfile())
-      return m_debug_map_symfile->Supports_DW_AT_APPLE_objc_complete_type(this);
-  }
-  return m_supports_DW_AT_APPLE_objc_complete_type == eLazyBoolYes;
-}
-
 // This function can be used when a DIE is found that is a forward declaration
 // DIE and we want to try and find a type that has the complete definition.
 TypeSP SymbolFileDWARF::FindCompleteObjCDefinitionTypeForDIE(
@@ -3120,8 +3088,7 @@ TypeSP SymbolFileDWARF::FindCompleteObjCDefinitionTypeForDIE(
         if (type_die == die || !IsStructOrClassTag(type_die.Tag()))
           return true;
 
-        if (must_be_implementation &&
-            type_die.Supports_DW_AT_APPLE_objc_complete_type()) {
+        if (must_be_implementation) {
           const bool try_resolving_type = type_die.GetAttributeValueAsUnsigned(
               DW_AT_APPLE_objc_complete_type, 0);
           if (!try_resolving_type)

lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.h

@@ -246,8 +246,6 @@ class SymbolFileDWARF : public SymbolFileCommon {
   virtual void GetObjCMethods(ConstString class_name,
                               llvm::function_ref<bool(DWARFDIE die)> callback);
 
-  bool Supports_DW_AT_APPLE_objc_complete_type(DWARFUnit *cu);
-
   DebugMacrosSP ParseDebugMacros(lldb::offset_t *offset);
 
   static DWARFDIE GetParentSymbolContextDIE(const DWARFDIE &die);
@@ -556,7 +554,6 @@ class SymbolFileDWARF : public SymbolFileCommon {
   ExternalTypeModuleMap m_external_type_modules;
   std::unique_ptr<DWARFIndex> m_index;
   bool m_fetched_external_modules : 1;
-  LazyBool m_supports_DW_AT_APPLE_objc_complete_type;
 
   typedef std::set<DIERef> DIERefSet;
   typedef llvm::StringMap<DIERefSet> NameToOffsetMap;

lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARFDebugMap.cpp

@@ -249,9 +249,8 @@ SymbolFile *SymbolFileDWARFDebugMap::CreateInstance(ObjectFileSP objfile_sp) {
 }
 
 SymbolFileDWARFDebugMap::SymbolFileDWARFDebugMap(ObjectFileSP objfile_sp)
-    : SymbolFileCommon(std::move(objfile_sp)), m_flags(), m_compile_unit_infos(),
-      m_func_indexes(), m_glob_indexes(),
-      m_supports_DW_AT_APPLE_objc_complete_type(eLazyBoolCalculate) {}
+    : SymbolFileCommon(std::move(objfile_sp)), m_flags(),
+      m_compile_unit_infos(), m_func_indexes(), m_glob_indexes() {}
 
 SymbolFileDWARFDebugMap::~SymbolFileDWARFDebugMap() = default;
 
@@ -1178,22 +1177,6 @@ DWARFDIE SymbolFileDWARFDebugMap::FindDefinitionDIE(const DWARFDIE &die) {
   return result;
 }
 
-bool SymbolFileDWARFDebugMap::Supports_DW_AT_APPLE_objc_complete_type(
-    SymbolFileDWARF *skip_dwarf_oso) {
-  if (m_supports_DW_AT_APPLE_objc_complete_type == eLazyBoolCalculate) {
-    m_supports_DW_AT_APPLE_objc_complete_type = eLazyBoolNo;
-    ForEachSymbolFile([&](SymbolFileDWARF *oso_dwarf) {
-      if (skip_dwarf_oso != oso_dwarf &&
-          oso_dwarf->Supports_DW_AT_APPLE_objc_complete_type(nullptr)) {
-        m_supports_DW_AT_APPLE_objc_complete_type = eLazyBoolYes;
-        return IterationAction::Stop;
-      }
-      return IterationAction::Continue;
-    });
-  }
-  return m_supports_DW_AT_APPLE_objc_complete_type == eLazyBoolYes;
-}
-
 TypeSP SymbolFileDWARFDebugMap::FindCompleteObjCDefinitionTypeForDIE(
     const DWARFDIE &die, ConstString type_name,
     bool must_be_implementation) {

lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARFDebugMap.h

@@ -293,8 +293,6 @@ class SymbolFileDWARFDebugMap : public SymbolFileCommon {
 
   DWARFDIE FindDefinitionDIE(const DWARFDIE &die);
 
-  bool Supports_DW_AT_APPLE_objc_complete_type(SymbolFileDWARF *skip_dwarf_oso);
-
   lldb::TypeSP FindCompleteObjCDefinitionTypeForDIE(
       const DWARFDIE &die, ConstString type_name, bool must_be_implementation);
 
@@ -345,7 +343,6 @@ class SymbolFileDWARFDebugMap : public SymbolFileCommon {
   llvm::DenseMap<lldb::opaque_compiler_type_t, DIERef>
       m_forward_decl_compiler_type_to_die;
   UniqueDWARFASTTypeMap m_unique_ast_type_map;
-  LazyBool m_supports_DW_AT_APPLE_objc_complete_type;
   DebugMap m_debug_map;
 
   // When an object file from the debug map gets parsed in