[lldb] Move non-DWARF code: DWARFUnit -> SymbolFileDWARF

This patchset is removing non-DWARF code from DWARFUnit for better
future merge with LLVM DWARF as discussed with @labath.

Differential revision: https://reviews.llvm.org/D70646

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

@@ -155,7 +155,7 @@ TypeSP DWARFASTParserClang::ParseTypeFromClangModule(const SymbolContext &sc,
 
   // The type in the Clang module must have the same language as the current CU.
   LanguageSet languages;
-  languages.Insert(die.GetCU()->GetLanguageType());
+  languages.Insert(SymbolFileDWARF::GetLanguage(*die.GetCU()));
   llvm::DenseSet<SymbolFile *> searched_symbol_files;
   clang_module_sp->GetSymbolFile()->FindTypes(decl_context, languages,
                                               searched_symbol_files, pcm_types);
@@ -504,7 +504,7 @@ DWARFASTParserClang::ParseTypeModifier(const SymbolContext &sc,
                                         DWARF_LOG_LOOKUPS));
   SymbolFileDWARF *dwarf = die.GetDWARF();
   const dw_tag_t tag = die.Tag();
-  LanguageType cu_language = die.GetLanguage();
+  LanguageType cu_language = SymbolFileDWARF::GetLanguage(*die.GetCU());
   Type::ResolveState resolve_state = Type::ResolveState::Unresolved;
   Type::EncodingDataType encoding_data_type = Type::eEncodingIsUID;
   TypeSP type_sp;
@@ -726,8 +726,7 @@ TypeSP DWARFASTParserClang::ParseEnum(const SymbolContext &sc,
     if (type_sp)
       return type_sp;
 
-    DWARFDeclContext die_decl_ctx;
-    die.GetDWARFDeclContext(die_decl_ctx);
+    DWARFDeclContext die_decl_ctx = SymbolFileDWARF::GetDWARFDeclContext(die);
 
     type_sp = dwarf->FindDefinitionTypeForDWARFDeclContext(die_decl_ctx);
 
@@ -1383,7 +1382,7 @@ DWARFASTParserClang::ParseStructureLikeDIE(const SymbolContext &sc,
   CompilerType clang_type;
   const dw_tag_t tag = die.Tag();
   SymbolFileDWARF *dwarf = die.GetDWARF();
-  LanguageType cu_language = die.GetLanguage();
+  LanguageType cu_language = SymbolFileDWARF::GetLanguage(*die.GetCU());
   Log *log = LogChannelDWARF::GetLogIfAll(DWARF_LOG_TYPE_COMPLETION |
                                           DWARF_LOG_LOOKUPS);
 
@@ -1515,8 +1514,7 @@ DWARFASTParserClang::ParseStructureLikeDIE(const SymbolContext &sc,
     if (type_sp)
       return type_sp;
 
-    DWARFDeclContext die_decl_ctx;
-    die.GetDWARFDeclContext(die_decl_ctx);
+    DWARFDeclContext die_decl_ctx = SymbolFileDWARF::GetDWARFDeclContext(die);
 
     // type_sp = FindDefinitionTypeForDIE (dwarf_cu, die,
     // type_name_const_str);
@@ -2311,9 +2309,11 @@ Function *DWARFASTParserClang::ParseFunctionFromDWARF(CompileUnit &comp_unit,
         func_name.SetValue(ConstString(mangled), true);
       else if ((die.GetParent().Tag() == DW_TAG_compile_unit ||
                 die.GetParent().Tag() == DW_TAG_partial_unit) &&
-               Language::LanguageIsCPlusPlus(die.GetLanguage()) &&
-               !Language::LanguageIsObjC(die.GetLanguage()) && name &&
-               strcmp(name, "main") != 0) {
+               Language::LanguageIsCPlusPlus(
+                   SymbolFileDWARF::GetLanguage(*die.GetCU())) &&
+               !Language::LanguageIsObjC(
+                   SymbolFileDWARF::GetLanguage(*die.GetCU())) &&
+               name && strcmp(name, "main") != 0) {
         // If the mangled name is not present in the DWARF, generate the
         // demangled name using the decl context. We skip if the function is
         // "main" as its name is never mangled.
@@ -2323,10 +2323,9 @@ Function *DWARFASTParserClang::ParseFunctionFromDWARF(CompileUnit &comp_unit,
         unsigned type_quals = 0;
         std::vector<CompilerType> param_types;
         std::vector<clang::ParmVarDecl *> param_decls;
-        DWARFDeclContext decl_ctx;
         StreamString sstr;
 
-        die.GetDWARFDeclContext(decl_ctx);
+        DWARFDeclContext decl_ctx = SymbolFileDWARF::GetDWARFDeclContext(die);
         sstr << decl_ctx.GetQualifiedName();
 
         clang::DeclContext *containing_decl_ctx =
@@ -3274,7 +3273,7 @@ clang::Decl *DWARFASTParserClang::GetClangDeclForDIE(const DWARFDIE &die) {
     SymbolFileDWARF *dwarf = die.GetDWARF();
     DWARFDIE imported_uid = die.GetAttributeValueAsReferenceDIE(DW_AT_import);
     if (imported_uid) {
-      CompilerDecl imported_decl = imported_uid.GetDecl();
+      CompilerDecl imported_decl = SymbolFileDWARF::GetDecl(imported_uid);
       if (imported_decl) {
         clang::DeclContext *decl_context =
             TypeSystemClang::DeclContextGetAsDeclContext(
@@ -3293,7 +3292,8 @@ clang::Decl *DWARFASTParserClang::GetClangDeclForDIE(const DWARFDIE &die) {
     DWARFDIE imported_uid = die.GetAttributeValueAsReferenceDIE(DW_AT_import);
 
     if (imported_uid) {
-      CompilerDeclContext imported_decl_ctx = imported_uid.GetDeclContext();
+      CompilerDeclContext imported_decl_ctx =
+          SymbolFileDWARF::GetDeclContext(imported_uid);
       if (imported_decl_ctx) {
         clang::DeclContext *decl_context =
             TypeSystemClang::DeclContextGetAsDeclContext(
@@ -3641,9 +3641,9 @@ bool DWARFASTParserClang::CopyUniqueClassMethodTypes(
   }
 
   DWARFASTParserClang *src_dwarf_ast_parser =
-      (DWARFASTParserClang *)src_die.GetDWARFParser();
+      (DWARFASTParserClang *)SymbolFileDWARF::GetDWARFParser(*src_die.GetCU());
   DWARFASTParserClang *dst_dwarf_ast_parser =
-      (DWARFASTParserClang *)dst_die.GetDWARFParser();
+      (DWARFASTParserClang *)SymbolFileDWARF::GetDWARFParser(*dst_die.GetCU());
 
   // Now do the work of linking the DeclContexts and Types.
   if (fast_path) {

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

@@ -74,13 +74,6 @@ const char *DWARFBaseDIE::GetName() const {
     return nullptr;
 }
 
-lldb::LanguageType DWARFBaseDIE::GetLanguage() const {
-  if (IsValid())
-    return m_cu->GetLanguageType();
-  else
-    return lldb::eLanguageTypeUnknown;
-}
-
 lldb::ModuleSP DWARFBaseDIE::GetModule() const {
   SymbolFileDWARF *dwarf = GetDWARF();
   if (dwarf)
@@ -103,24 +96,6 @@ SymbolFileDWARF *DWARFBaseDIE::GetDWARF() const {
     return nullptr;
 }
 
-llvm::Expected<lldb_private::TypeSystem &> DWARFBaseDIE::GetTypeSystem() const {
-  if (!m_cu)
-    return llvm::make_error<llvm::StringError>(
-        "Unable to get TypeSystem, no compilation unit available",
-        llvm::inconvertibleErrorCode());
-  return m_cu->GetTypeSystem();
-}
-
-DWARFASTParser *DWARFBaseDIE::GetDWARFParser() const {
-  auto type_system_or_err = GetTypeSystem();
-  if (auto err = type_system_or_err.takeError()) {
-    LLDB_LOG_ERROR(lldb_private::GetLogIfAnyCategoriesSet(LIBLLDB_LOG_SYMBOLS),
-                   std::move(err), "Unable to get DWARFASTParser");
-    return nullptr;
-  }
-  return type_system_or_err->GetDWARFParser();
-}
-
 bool DWARFBaseDIE::HasChildren() const {
   return m_die && m_die->HasChildren();
 }

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

@@ -57,10 +57,6 @@ public:
 
   llvm::Optional<DIERef> GetDIERef() const;
 
-  llvm::Expected<lldb_private::TypeSystem &> GetTypeSystem() const;
-
-  DWARFASTParser *GetDWARFParser() const;
-
   void Set(DWARFUnit *cu, DWARFDebugInfoEntry *die) {
     if (cu && die) {
       m_cu = cu;
@@ -98,8 +94,6 @@ public:
 
   const char *GetName() const;
 
-  lldb::LanguageType GetLanguage() const;
-
   lldb::ModuleSP GetModule() const;
 
   // Getting attribute values from the DIE.

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

@@ -372,15 +372,6 @@ std::vector<DWARFDIE> DWARFDIE::GetDeclContextDIEs() const {
   return result;
 }
 
-void DWARFDIE::GetDWARFDeclContext(DWARFDeclContext &dwarf_decl_ctx) const {
-  if (IsValid()) {
-    dwarf_decl_ctx.SetLanguage(GetLanguage());
-    m_die->GetDWARFDeclContext(GetCU(), dwarf_decl_ctx);
-  } else {
-    dwarf_decl_ctx.Clear();
-  }
-}
-
 void DWARFDIE::GetDeclContext(
     llvm::SmallVectorImpl<lldb_private::CompilerContext> &context) const {
   const dw_tag_t tag = Tag();
@@ -457,27 +448,3 @@ bool DWARFDIE::GetDIENamesAndRanges(
   } else
     return false;
 }
-
-CompilerDecl DWARFDIE::GetDecl() const {
-  DWARFASTParser *dwarf_ast = GetDWARFParser();
-  if (dwarf_ast)
-    return dwarf_ast->GetDeclForUIDFromDWARF(*this);
-  else
-    return CompilerDecl();
-}
-
-CompilerDeclContext DWARFDIE::GetDeclContext() const {
-  DWARFASTParser *dwarf_ast = GetDWARFParser();
-  if (dwarf_ast)
-    return dwarf_ast->GetDeclContextForUIDFromDWARF(*this);
-  else
-    return CompilerDeclContext();
-}
-
-CompilerDeclContext DWARFDIE::GetContainingDeclContext() const {
-  DWARFASTParser *dwarf_ast = GetDWARFParser();
-  if (dwarf_ast)
-    return dwarf_ast->GetDeclContextContainingUIDFromDWARF(*this);
-  else
-    return CompilerDeclContext();
-}

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

@@ -70,8 +70,6 @@ public:
   // DeclContext related functions
   std::vector<DWARFDIE> GetDeclContextDIEs() const;
 
-  void GetDWARFDeclContext(DWARFDeclContext &dwarf_decl_ctx) const;
-
   /// Return this DIE's decl context as it is needed to look up types
   /// in Clang's -gmodules debug info format.
   void GetDeclContext(
@@ -90,14 +88,6 @@ public:
                             int &decl_line, int &decl_column, int &call_file,
                             int &call_line, int &call_column,
                             lldb_private::DWARFExpression *frame_base) const;
-
-  // CompilerDecl related functions
-
-  lldb_private::CompilerDecl GetDecl() const;
-
-  lldb_private::CompilerDeclContext GetDeclContext() const;
-
-  lldb_private::CompilerDeclContext GetContainingDeclContext() const;
 };
 
 #endif // SymbolFileDWARF_DWARFDIE_h_

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

@@ -868,19 +868,20 @@ void DWARFDebugInfoEntry::BuildFunctionAddressRangeTable(
   }
 }
 
-void DWARFDebugInfoEntry::GetDWARFDeclContext(
-    DWARFUnit *cu, DWARFDeclContext &dwarf_decl_ctx) const {
+DWARFDeclContext DWARFDebugInfoEntry::GetDWARFDeclContext(DWARFUnit *cu) const {
+  DWARFDeclContext dwarf_decl_ctx;
   const dw_tag_t tag = Tag();
   if (tag != DW_TAG_compile_unit && tag != DW_TAG_partial_unit) {
-    dwarf_decl_ctx.AppendDeclContext(tag, GetName(cu));
     DWARFDIE parent_decl_ctx_die = GetParentDeclContextDIE(cu);
     if (parent_decl_ctx_die && parent_decl_ctx_die.GetDIE() != this) {
       if (parent_decl_ctx_die.Tag() != DW_TAG_compile_unit &&
           parent_decl_ctx_die.Tag() != DW_TAG_partial_unit)
-        parent_decl_ctx_die.GetDIE()->GetDWARFDeclContext(
-            parent_decl_ctx_die.GetCU(), dwarf_decl_ctx);
+        dwarf_decl_ctx = parent_decl_ctx_die.GetDIE()->GetDWARFDeclContext(
+            parent_decl_ctx_die.GetCU());
     }
+    dwarf_decl_ctx.AppendDeclContext(tag, GetName(cu));
   }
+  return dwarf_decl_ctx;
 }
 
 DWARFDIE

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

@@ -158,8 +158,7 @@ public:
     return HasChildren() ? this + 1 : nullptr;
   }
 
-  void GetDWARFDeclContext(DWARFUnit *cu,
-                           DWARFDeclContext &dwarf_decl_ctx) const;
+  DWARFDeclContext GetDWARFDeclContext(DWARFUnit *cu) const;
 
   DWARFDIE GetParentDeclContextDIE(DWARFUnit *cu) const;
   DWARFDIE GetParentDeclContextDIE(DWARFUnit *cu,

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

@@ -514,10 +514,6 @@ lldb::ByteOrder DWARFUnit::GetByteOrder() const {
   return m_dwarf.GetObjectFile()->GetByteOrder();
 }
 
-llvm::Expected<TypeSystem &> DWARFUnit::GetTypeSystem() {
-  return m_dwarf.GetTypeSystemForLanguage(GetLanguageType());
-}
-
 void DWARFUnit::SetBaseAddress(dw_addr_t base_addr) { m_base_addr = base_addr; }
 
 // Compare function DWARFDebugAranges::Range structures
@@ -655,28 +651,17 @@ uint32_t DWARFUnit::GetProducerVersionUpdate() {
     ParseProducerInfo();
   return m_producer_version_update;
 }
-LanguageType DWARFUnit::LanguageTypeFromDWARF(uint64_t val) {
-  // Note: user languages between lo_user and hi_user must be handled
-  // explicitly here.
-  switch (val) {
-  case DW_LANG_Mips_Assembler:
-    return eLanguageTypeMipsAssembler;
-  case DW_LANG_GOOGLE_RenderScript:
-    return eLanguageTypeExtRenderScript;
-  default:
-    return static_cast<LanguageType>(val);
-  }
-}
 
-LanguageType DWARFUnit::GetLanguageType() {
-  if (m_language_type != eLanguageTypeUnknown)
-    return m_language_type;
+uint64_t DWARFUnit::GetDWARFLanguageType() {
+  if (m_language_type)
+    return *m_language_type;
 
   const DWARFDebugInfoEntry *die = GetUnitDIEPtrOnly();
-  if (die)
-    m_language_type = LanguageTypeFromDWARF(
-        die->GetAttributeValueAsUnsigned(this, DW_AT_language, 0));
-  return m_language_type;
+  if (!die)
+    m_language_type = 0;
+  else
+    m_language_type = die->GetAttributeValueAsUnsigned(this, DW_AT_language, 0);
+  return *m_language_type;
 }
 
 bool DWARFUnit::GetIsOptimized() {

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

@@ -152,8 +152,6 @@ public:
 
   lldb::ByteOrder GetByteOrder() const;
 
-  llvm::Expected<lldb_private::TypeSystem &> GetTypeSystem();
-
   const DWARFDebugAranges &GetFunctionAranges();
 
   void SetBaseAddress(dw_addr_t base_addr);
@@ -190,9 +188,7 @@ public:
 
   uint32_t GetProducerVersionUpdate();
 
-  static lldb::LanguageType LanguageTypeFromDWARF(uint64_t val);
-
-  lldb::LanguageType GetLanguageType();
+  uint64_t GetDWARFLanguageType();
 
   bool GetIsOptimized();
 
@@ -304,7 +300,7 @@ protected:
   uint32_t m_producer_version_major = 0;
   uint32_t m_producer_version_minor = 0;
   uint32_t m_producer_version_update = 0;
-  lldb::LanguageType m_language_type = lldb::eLanguageTypeUnknown;
+  llvm::Optional<uint64_t> m_language_type;
   lldb_private::LazyBool m_is_optimized = lldb_private::eLazyBoolCalculate;
   llvm::Optional<lldb_private::FileSpec> m_comp_dir;
   llvm::Optional<lldb_private::FileSpec> m_file_spec;

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

@@ -100,7 +100,7 @@ void ManualDWARFIndex::IndexUnit(DWARFUnit &unit, IndexSet &set) {
         unit.GetOffset());
   }
 
-  const LanguageType cu_language = unit.GetLanguageType();
+  const LanguageType cu_language = SymbolFileDWARF::GetLanguage(unit);
 
   IndexUnitImpl(unit, cu_language, set);
 

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

@@ -670,7 +670,7 @@ lldb::CompUnitSP SymbolFileDWARF::ParseCompileUnit(DWARFCompileUnit &dwarf_cu) {
               cu_file_spec.SetFile(remapped_file, FileSpec::Style::native);
           }
 
-          LanguageType cu_language = DWARFUnit::LanguageTypeFromDWARF(
+          LanguageType cu_language = SymbolFileDWARF::LanguageTypeFromDWARF(
               cu_die.GetAttributeValueAsUnsigned(DW_AT_language, 0));
 
           bool is_optimized = dwarf_cu.GetNonSkeletonUnit().GetIsOptimized();
@@ -748,8 +748,7 @@ Function *SymbolFileDWARF::ParseFunction(CompileUnit &comp_unit,
   if (!die.IsValid())
     return nullptr;
 
-  auto type_system_or_err =
-      GetTypeSystemForLanguage(die.GetCU()->GetLanguageType());
+  auto type_system_or_err = GetTypeSystemForLanguage(GetLanguage(*die.GetCU()));
   if (auto err = type_system_or_err.takeError()) {
     LLDB_LOG_ERROR(lldb_private::GetLogIfAnyCategoriesSet(LIBLLDB_LOG_SYMBOLS),
                    std::move(err), "Unable to parse function");
@@ -781,7 +780,7 @@ lldb::LanguageType SymbolFileDWARF::ParseLanguage(CompileUnit &comp_unit) {
   std::lock_guard<std::recursive_mutex> guard(GetModuleMutex());
   DWARFUnit *dwarf_cu = GetDWARFCompileUnit(&comp_unit);
   if (dwarf_cu)
-    return dwarf_cu->GetLanguageType();
+    return GetLanguage(*dwarf_cu);
   else
     return eLanguageTypeUnknown;
 }
@@ -1272,7 +1271,7 @@ CompilerDecl SymbolFileDWARF::GetDeclForUID(lldb::user_id_t type_uid) {
   // SymbolFileDWARF::GetDIE(). See comments inside the
   // SymbolFileDWARF::GetDIE() for details.
   if (DWARFDIE die = GetDIE(type_uid))
-    return die.GetDecl();
+    return GetDecl(die);
   return CompilerDecl();
 }
 
@@ -1285,7 +1284,7 @@ SymbolFileDWARF::GetDeclContextForUID(lldb::user_id_t type_uid) {
   // SymbolFileDWARF::GetDIE(). See comments inside the
   // SymbolFileDWARF::GetDIE() for details.
   if (DWARFDIE die = GetDIE(type_uid))
-    return die.GetDeclContext();
+    return GetDeclContext(die);
   return CompilerDeclContext();
 }
 
@@ -1296,7 +1295,7 @@ SymbolFileDWARF::GetDeclContextContainingUID(lldb::user_id_t type_uid) {
   // SymbolFileDWARF::GetDIE(). See comments inside the
   // SymbolFileDWARF::GetDIE() for details.
   if (DWARFDIE die = GetDIE(type_uid))
-    return die.GetContainingDeclContext();
+    return GetContainingDeclContext(die);
   return CompilerDeclContext();
 }
 
@@ -1427,8 +1426,7 @@ bool SymbolFileDWARF::CompleteType(CompilerType &compiler_type) {
           dwarf_die.GetID(), dwarf_die.GetTagAsCString(),
           type->GetName().AsCString());
     assert(compiler_type);
-    DWARFASTParser *dwarf_ast = dwarf_die.GetDWARFParser();
-    if (dwarf_ast)
+    if (DWARFASTParser *dwarf_ast = GetDWARFParser(*dwarf_die.GetCU()))
       return dwarf_ast->CompleteTypeFromDWARF(dwarf_die, type, compiler_type);
   }
   return false;
@@ -2099,8 +2097,7 @@ void SymbolFileDWARF::FindGlobalVariables(
           sc.comp_unit = GetCompUnitForDWARFCompUnit(*dwarf_cu);
 
           if (parent_decl_ctx) {
-            DWARFASTParser *dwarf_ast = die.GetDWARFParser();
-            if (dwarf_ast) {
+            if (DWARFASTParser *dwarf_ast = GetDWARFParser(*die.GetCU())) {
               CompilerDeclContext actual_parent_decl_ctx =
                   dwarf_ast->GetDeclContextContainingUIDFromDWARF(die);
               if (!actual_parent_decl_ctx ||
@@ -2258,11 +2255,9 @@ bool SymbolFileDWARF::DIEInDeclContext(const CompilerDeclContext *decl_ctx,
     return true;
 
   if (die) {
-    DWARFASTParser *dwarf_ast = die.GetDWARFParser();
-    if (dwarf_ast) {
-      CompilerDeclContext actual_decl_ctx =
-          dwarf_ast->GetDeclContextContainingUIDFromDWARF(die);
-      if (actual_decl_ctx)
+    if (DWARFASTParser *dwarf_ast = GetDWARFParser(*die.GetCU())) {
+      if (CompilerDeclContext actual_decl_ctx =
+              dwarf_ast->GetDeclContextContainingUIDFromDWARF(die))
         return decl_ctx->IsContainedInLookup(actual_decl_ctx);
     }
   }
@@ -2509,7 +2504,7 @@ void SymbolFileDWARF::FindTypes(
       m_index->ReportInvalidDIERef(die_ref, name.GetStringRef());
       continue;
     }
-    if (!languages[die.GetCU()->GetLanguageType()])
+    if (!languages[GetLanguage(*die.GetCU())])
       continue;
 
     llvm::SmallVector<CompilerContext, 4> die_context;
@@ -2566,8 +2561,7 @@ SymbolFileDWARF::FindNamespace(ConstString name,
           if (!DIEInDeclContext(parent_decl_ctx, die))
             continue; // The containing decl contexts don't match
 
-          DWARFASTParser *dwarf_ast = die.GetDWARFParser();
-          if (dwarf_ast) {
+          if (DWARFASTParser *dwarf_ast = GetDWARFParser(*die.GetCU())) {
             namespace_decl_ctx = dwarf_ast->GetDeclContextForUIDFromDWARF(die);
             if (namespace_decl_ctx)
               break;
@@ -2928,7 +2922,7 @@ TypeSP SymbolFileDWARF::FindDefinitionTypeForDWARFDeclContext(
             // looking for. We don't want to find a "Foo" type from Java if we
             // are looking for a "Foo" type for C, C++, ObjC, or ObjC++.
             if (type_system &&
-                !type_system->SupportsLanguage(type_die.GetLanguage()))
+                !type_system->SupportsLanguage(GetLanguage(*type_die.GetCU())))
               continue;
             bool try_resolving_type = false;
 
@@ -2962,8 +2956,8 @@ TypeSP SymbolFileDWARF::FindDefinitionTypeForDWARFDeclContext(
             }
 
             if (try_resolving_type) {
-              DWARFDeclContext type_dwarf_decl_ctx;
-              type_die.GetDWARFDeclContext(type_dwarf_decl_ctx);
+              DWARFDeclContext type_dwarf_decl_ctx =
+                  GetDWARFDeclContext(type_die);
 
               if (log) {
                 GetObjectFile()->GetModule()->LogMessage(
@@ -3013,8 +3007,7 @@ TypeSP SymbolFileDWARF::ParseType(const SymbolContext &sc, const DWARFDIE &die,
   if (!die)
     return {};
 
-  auto type_system_or_err =
-      GetTypeSystemForLanguage(die.GetCU()->GetLanguageType());
+  auto type_system_or_err = GetTypeSystemForLanguage(GetLanguage(*die.GetCU()));
   if (auto err = type_system_or_err.takeError()) {
     LLDB_LOG_ERROR(lldb_private::GetLogIfAnyCategoriesSet(LIBLLDB_LOG_SYMBOLS),
                    std::move(err), "Unable to parse type");
@@ -3381,12 +3374,10 @@ VariableSP SymbolFileDWARF::ParseVariableDIE(const SymbolContext &sc,
         // declaration context.
         if ((parent_tag == DW_TAG_compile_unit ||
              parent_tag == DW_TAG_partial_unit) &&
-            Language::LanguageIsCPlusPlus(die.GetLanguage())) {
-          DWARFDeclContext decl_ctx;
-
-          die.GetDWARFDeclContext(decl_ctx);
-          mangled = decl_ctx.GetQualifiedNameAsConstString().GetCString();
-        }
+            Language::LanguageIsCPlusPlus(GetLanguage(*die.GetCU())))
+          mangled = GetDWARFDeclContext(die)
+                        .GetQualifiedNameAsConstString()
+                        .GetCString();
       }
 
       if (tag == DW_TAG_formal_parameter)
@@ -3954,3 +3945,62 @@ SymbolFileDWARFDwp *SymbolFileDWARF::GetDwpSymbolFile() {
   });
   return m_dwp_symfile.get();
 }
+
+llvm::Expected<TypeSystem &> SymbolFileDWARF::GetTypeSystem(DWARFUnit &unit) {
+  return unit.GetSymbolFileDWARF().GetTypeSystemForLanguage(GetLanguage(unit));
+}
+
+DWARFASTParser *SymbolFileDWARF::GetDWARFParser(DWARFUnit &unit) {
+  auto type_system_or_err = GetTypeSystem(unit);
+  if (auto err = type_system_or_err.takeError()) {
+    LLDB_LOG_ERROR(lldb_private::GetLogIfAnyCategoriesSet(LIBLLDB_LOG_SYMBOLS),
+                   std::move(err), "Unable to get DWARFASTParser");
+    return nullptr;
+  }
+  return type_system_or_err->GetDWARFParser();
+}
+
+CompilerDecl SymbolFileDWARF::GetDecl(const DWARFDIE &die) {
+  if (DWARFASTParser *dwarf_ast = GetDWARFParser(*die.GetCU()))
+    return dwarf_ast->GetDeclForUIDFromDWARF(die);
+  return CompilerDecl();
+}
+
+CompilerDeclContext SymbolFileDWARF::GetDeclContext(const DWARFDIE &die) {
+  if (DWARFASTParser *dwarf_ast = GetDWARFParser(*die.GetCU()))
+    return dwarf_ast->GetDeclContextForUIDFromDWARF(die);
+  return CompilerDeclContext();
+}
+
+CompilerDeclContext
+SymbolFileDWARF::GetContainingDeclContext(const DWARFDIE &die) {
+  if (DWARFASTParser *dwarf_ast = GetDWARFParser(*die.GetCU()))
+    return dwarf_ast->GetDeclContextContainingUIDFromDWARF(die);
+  return CompilerDeclContext();
+}
+
+DWARFDeclContext SymbolFileDWARF::GetDWARFDeclContext(const DWARFDIE &die) {
+  if (!die.IsValid())
+    return {};
+  DWARFDeclContext dwarf_decl_ctx =
+      die.GetDIE()->GetDWARFDeclContext(die.GetCU());
+  dwarf_decl_ctx.SetLanguage(GetLanguage(*die.GetCU()));
+  return dwarf_decl_ctx;
+}
+
+LanguageType SymbolFileDWARF::LanguageTypeFromDWARF(uint64_t val) {
+  // Note: user languages between lo_user and hi_user must be handled
+  // explicitly here.
+  switch (val) {
+  case DW_LANG_Mips_Assembler:
+    return eLanguageTypeMipsAssembler;
+  case DW_LANG_GOOGLE_RenderScript:
+    return eLanguageTypeExtRenderScript;
+  default:
+    return static_cast<LanguageType>(val);
+  }
+}
+
+LanguageType SymbolFileDWARF::GetLanguage(DWARFUnit &unit) {
+  return LanguageTypeFromDWARF(unit.GetDWARFLanguageType());
+}

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

@@ -301,6 +301,26 @@ public:
 
   lldb_private::FileSpec GetFile(DWARFUnit &unit, size_t file_idx);
 
+  static llvm::Expected<lldb_private::TypeSystem &>
+  GetTypeSystem(DWARFUnit &unit);
+
+  static DWARFASTParser *GetDWARFParser(DWARFUnit &unit);
+
+  // CompilerDecl related functions
+
+  static lldb_private::CompilerDecl GetDecl(const DWARFDIE &die);
+
+  static lldb_private::CompilerDeclContext GetDeclContext(const DWARFDIE &die);
+
+  static lldb_private::CompilerDeclContext
+  GetContainingDeclContext(const DWARFDIE &die);
+
+  static DWARFDeclContext GetDWARFDeclContext(const DWARFDIE &die);
+
+  static lldb::LanguageType LanguageTypeFromDWARF(uint64_t val);
+
+  static lldb::LanguageType GetLanguage(DWARFUnit &unit);
+
 protected:
   typedef llvm::DenseMap<const DWARFDebugInfoEntry *, lldb_private::Type *>
       DIEToTypePtr;