[NativePDB] Add support for parsing typedefs and make lldb-test work with the native reader.

[zturner]

Summary

Typedefs are represented as S_UDT records in the globals stream. This creates a strange situation where "types" are actually represented as "symbols", so they need special handling.

In order to test this, we don't just use lldb and print out some variables causing the AST to get created, because variables whose type is a typedef will have debug info referencing the original type, not the typedef. So we use lldb-test instead which will parse all debug info in the entire file. This exposed some problems with lldb-test and the native reader, mainly that certain types of obscure symbols which we can find when iterating every single record would trigger crashes. These have been fixed as well so that lldb-test can be used to test this functionality.

After this patch, I think most of the remaining DIA PDB tests can be re-written as native PDB tests, so hopefully this means we cane eliminate the DIA reader quite soon.

[labath]

Is there any chance we can get someone who knows something about pdbs take a look at this (@amccarth ? @aleksandr.urakov ?) ?

lldb/lit/SymbolFile/NativePDB/typedefs.cpp

3

What's the reason for this? Does the test need msvc linker or something?

[lemo]

lldb/source/Plugins/SymbolFile/NativePDB/PdbAstBuilder.cpp

626

leftover comment?

lldb/source/Plugins/SymbolFile/NativePDB/PdbUtil.h

70–74

this, in isolation at least, reads very strange : for m_kind==Union return cvclass.Name and for everything else return cvunion.Name ?

[zturner]

lldb/source/Plugins/SymbolFile/NativePDB/PdbAstBuilder.cpp

626

Yep, thanks.

lldb/source/Plugins/SymbolFile/NativePDB/PdbUtil.h

70–74

Oops, that's a bug. It's supposed to say

if (m_kind == Struct || m_kind == Class)
  return cvclass.Name;

I think the rest of the function makes sense after that. Thanks for catching that.

[zturner]

lldb/lit/SymbolFile/NativePDB/typedefs.cpp

3

It used to say --compiler=msvc until I realized it worked with clang-cl. Then I forgot to remove this. Thanks!

[amccarth]

lldb/source/Plugins/SymbolFile/NativePDB/SymbolFileNativePDB.cpp

1289

The body of this loop is a little odd because it's disposing of all the results and is just going through the motions to get side-effects to happen. I realize the root problem is with the design of the API. Perhaps a comment for the uninitiated might point future readers in the right direction.

lldb/include/lldb/Symbol/CompileUnit.h

public:
   ///
   /// @return
   ///     Returns 'true' if this compile unit was compiled with
   ///     optimization.  'false' indicates that either the optimization
   ///     is unknown, or this compile unit was built without optimization.
   //------------------------------------------------------------------
   bool GetIsOptimized();
 
+  //------------------------------------------------------------------
+  /// Returns the number of functions in this compile unit
+  //------------------------------------------------------------------
+  size_t GetNumFunctions() const { return m_functions_by_uid.size(); }
+
 protected:
   void *m_user_data; ///< User data for the SymbolFile parser to store
                      ///information into.
   lldb::LanguageType
       m_language; ///< The programming language enumeration value.
   Flags m_flags;  ///< Compile unit flags that help with partial parsing.
 
   /// Maps UIDs to functions.

lldb/lit/SymbolFile/NativePDB/typedefs.cpp

+// clang-format off
+
+// REQUIRES: system-windows
+// RUN: %build --compiler=clang-cl --nodefaultlib -o %t.exe -- %s
+// RUN: env LLDB_USE_NATIVE_PDB_READER=1 lldb-test symbols -dump-ast %t.exe | FileCheck %s
+
+namespace A {
+  namespace B {
+    using NamespaceTypedef = double;
+  }
+  template<typename T>
+  class C {
+  public:
+    using ClassTypedef = T;
+  };
+  using ClassTypedef = C<char>::ClassTypedef;
+  using ClassTypedef2 = C<wchar_t>::ClassTypedef;
+  
+  template<typename T>
+  using AliasTemplate = typename C<T>::ClassTypedef;
+}
+
+namespace {
+  using AnonNamespaceTypedef = bool;
+}
+
+using IntTypedef = int;
+
+using ULongArrayTypedef = unsigned long[10];
+
+using RefTypedef = long double*&;
+
+using FuncPtrTypedef = long long(*)(int&, unsigned char**, short[], const double, volatile bool);
+
+using VarArgsFuncTypedef = char(*)(void*, long, unsigned short, unsigned int, ...);
+
+using VarArgsFuncTypedefA = float(*)(...);
+
+int main(int argc, char **argv) {
+  long double *Ptr;
+  
+  A::B::NamespaceTypedef *X0;
+  A::C<char>::ClassTypedef *X1;
+  A::C<wchar_t>::ClassTypedef *X2;
+  AnonNamespaceTypedef *X3;
+  IntTypedef *X4;
+  ULongArrayTypedef *X5;
+  RefTypedef X6 = Ptr;
+  FuncPtrTypedef X7;
+  VarArgsFuncTypedef X8;
+  VarArgsFuncTypedefA X9;
+  A::AliasTemplate<float> X10;
+  return 0;
+}
+
+
+// CHECK:      namespace `anonymous namespace' {
+// CHECK-NEXT:     typedef bool AnonNamespaceTypedef;
+// CHECK-NEXT: }
+// CHECK-NEXT: typedef unsigned long ULongArrayTypedef[10];
+// CHECK-NEXT: typedef double *&RefTypedef;
+// CHECK-NEXT: namespace A {
+// CHECK-NEXT:     namespace B {
+// CHECK-NEXT:         typedef double NamespaceTypedef;
+// CHECK-NEXT:     }
+// CHECK-NEXT:     typedef float AliasTemplate<float>;
+// CHECK-NEXT: }
+// CHECK-NEXT: typedef long long (*FuncPtrTypedef)(int &, unsigned char **, short *, const double, volatile bool);
+// CHECK-NEXT: typedef char (*VarArgsFuncTypedef)(void *, long, unsigned short, unsigned int, ...);
+// CHECK-NEXT: typedef float (*VarArgsFuncTypedefA)(...);
+// CHECK-NEXT: typedef int IntTypedef;

lldb/source/Plugins/SymbolFile/NativePDB/PdbAstBuilder.h

public:
 
   clang::NamespaceDecl *GetOrCreateNamespaceDecl(llvm::StringRef name,
                                                  clang::DeclContext &context);
   clang::FunctionDecl *GetOrCreateFunctionDecl(PdbCompilandSymId func_id);
   clang::BlockDecl *GetOrCreateBlockDecl(PdbCompilandSymId block_id);
   clang::VarDecl *GetOrCreateVariableDecl(PdbCompilandSymId scope_id,
                                           PdbCompilandSymId var_id);
   clang::VarDecl *GetOrCreateVariableDecl(PdbGlobalSymId var_id);
+  clang::TypedefNameDecl *GetOrCreateTypedefDecl(PdbGlobalSymId id);
   void ParseDeclsForContext(clang::DeclContext &context);
 
   clang::QualType GetBasicType(lldb::BasicType type);
   clang::QualType GetOrCreateType(PdbTypeSymId type);
 
   bool CompleteTagDecl(clang::TagDecl &tag);
   bool CompleteType(clang::QualType qt);
 
private:
 
   void CreateFunctionParameters(PdbCompilandSymId func_id,
                                 clang::FunctionDecl &function_decl,
                                 uint32_t param_count);
   clang::Decl *GetOrCreateSymbolForId(PdbCompilandSymId id);
   clang::VarDecl *CreateVariableDecl(PdbSymUid uid,
                                      llvm::codeview::CVSymbol sym,
                                      clang::DeclContext &scope);
+  clang::DeclContext *
+  GetParentDeclContextForSymbol(const llvm::codeview::CVSymbol &sym);
 
   void ParseAllNamespacesPlusChildrenOf(llvm::Optional<llvm::StringRef> parent);
   void ParseDeclsForSimpleContext(clang::DeclContext &context);
   void ParseBlockChildren(PdbCompilandSymId block_id);
 
   void BuildParentMap();
   std::pair<clang::DeclContext *, std::string>
   CreateDeclInfoForType(const llvm::codeview::TagRecord &record, TypeIndex ti);
+  std::pair<clang::DeclContext *, std::string>
+  CreateDeclInfoForUndecoratedName(llvm::StringRef uname);
   clang::QualType CreateSimpleType(TypeIndex ti);
 
   PdbIndex &m_index;
   ClangASTContext &m_clang;
 
   ClangASTImporter m_importer;
 
   llvm::DenseMap<TypeIndex, TypeIndex> m_parent_types;

lldb/source/Plugins/SymbolFile/NativePDB/PdbAstBuilder.cpp

 #include "PdbAstBuilder.h"
 
 #include "llvm/DebugInfo/CodeView/CVTypeVisitor.h"
 #include "llvm/DebugInfo/CodeView/LazyRandomTypeCollection.h"
+#include "llvm/DebugInfo/CodeView/RecordName.h"
 #include "llvm/DebugInfo/CodeView/SymbolDeserializer.h"
 #include "llvm/DebugInfo/CodeView/SymbolRecord.h"
 #include "llvm/DebugInfo/CodeView/SymbolRecordHelpers.h"
 #include "llvm/DebugInfo/CodeView/TypeDeserializer.h"
 #include "llvm/DebugInfo/CodeView/TypeVisitorCallbacks.h"
 #include "llvm/DebugInfo/PDB/Native/DbiStream.h"
 #include "llvm/DebugInfo/PDB/Native/PublicsStream.h"
 #include "llvm/DebugInfo/PDB/Native/SymbolStream.h"
 #include "llvm/DebugInfo/PDB/Native/TpiStream.h"
 #include "llvm/Demangle/MicrosoftDemangle.h"
 
+#include "Plugins/Language/CPlusPlus/MSVCUndecoratedNameParser.h"
 #include "lldb/Core/Module.h"
 #include "lldb/Symbol/ClangASTContext.h"
 #include "lldb/Symbol/ClangExternalASTSourceCommon.h"
 #include "lldb/Symbol/ClangUtil.h"
 #include "lldb/Symbol/ObjectFile.h"
 #include "lldb/Utility/LLDBAssert.h"
 
 #include "PdbUtil.h"

 
 clang::DeclContext &PdbAstBuilder::GetTranslationUnitDecl() {
   return *m_clang.GetTranslationUnitDecl();
 }
 
 std::pair<clang::DeclContext *, std::string>
 PdbAstBuilder::CreateDeclInfoForType(const TagRecord &record, TypeIndex ti) {
   // FIXME: Move this to GetDeclContextContainingUID.
+  if (!record.hasUniqueName())
+    return CreateDeclInfoForUndecoratedName(record.Name);
 
   llvm::ms_demangle::Demangler demangler;
   StringView sv(record.UniqueName.begin(), record.UniqueName.size());
   llvm::ms_demangle::TagTypeNode *ttn = demangler.parseTagUniqueName(sv);
+  if (demangler.Error)
+    return {m_clang.GetTranslationUnitDecl(), record.UniqueName};
+
   llvm::ms_demangle::IdentifierNode *idn =
       ttn->QualifiedName->getUnqualifiedIdentifier();
   std::string uname = idn->toString(llvm::ms_demangle::OF_NoTagSpecifier);
 
   llvm::ms_demangle::NodeArrayNode *name_components =
       ttn->QualifiedName->Components;
   llvm::ArrayRef<llvm::ms_demangle::Node *> scopes(name_components->Nodes,
                                                    name_components->Count - 1);
clang::DeclContext *PdbAstBuilder::GetOrCreateDeclContextForUid(PdbSymUid uid) {
 
   clang::Decl *decl = GetOrCreateDeclForUid(uid);
   if (!decl)
     return nullptr;
 
   return clang::Decl::castToDeclContext(decl);
 }
 
-clang::DeclContext *PdbAstBuilder::GetParentDeclContext(PdbSymUid uid) {
-  // We must do this *without* calling GetOrCreate on the current uid, as
-  // that would be an infinite recursion.
-  switch (uid.kind()) {
-  case PdbSymUidKind::CompilandSym: {
-    llvm::Optional<PdbCompilandSymId> scope =
-        FindSymbolScope(m_index, uid.asCompilandSym());
-    if (scope)
-      return GetOrCreateDeclContextForUid(*scope);
+std::pair<clang::DeclContext *, std::string>
+PdbAstBuilder::CreateDeclInfoForUndecoratedName(llvm::StringRef name) {
+  MSVCUndecoratedNameParser parser(name);
+  llvm::ArrayRef<MSVCUndecoratedNameSpecifier> specs = parser.GetSpecifiers();
 
-    CVSymbol sym = m_index.ReadSymbolRecord(uid.asCompilandSym());
-    if (!SymbolHasAddress(sym))
-      return &GetTranslationUnitDecl();
-    SegmentOffset addr = GetSegmentAndOffset(sym);
-    llvm::Optional<PublicSym32> pub =
-        FindPublicSym(addr, m_index.symrecords(), m_index.publics());
-    if (!pub)
-      return &GetTranslationUnitDecl();
+  clang::DeclContext *context = &GetTranslationUnitDecl();
+
+  llvm::StringRef uname = specs.back().GetBaseName();
+  specs = specs.drop_back();
+  if (specs.empty())
+    return {context, name};
+
+  llvm::StringRef scope_name = specs.back().GetFullName();
+
+  // It might be a class name, try that first.
+  std::vector<TypeIndex> types = m_index.tpi().findRecordsByName(scope_name);
+  while (!types.empty()) {
+    clang::QualType qt = GetOrCreateType(types.back());
+    clang::TagDecl *tag = qt->getAsTagDecl();
+    if (tag)
+      return {clang::TagDecl::castToDeclContext(tag), uname};
+    types.pop_back();
+  }
+
+  // If that fails, treat it as a series of namespaces.
+  for (const MSVCUndecoratedNameSpecifier &spec : specs) {
+    std::string ns_name = spec.GetBaseName().str();
+    context = m_clang.GetUniqueNamespaceDeclaration(ns_name.c_str(), context);
+  }
+  return {context, uname};
+}
+
+clang::DeclContext *
+PdbAstBuilder::GetParentDeclContextForSymbol(const CVSymbol &sym) {
+    return CreateDeclInfoForUndecoratedName(getSymbolName(sym)).first;
+    return CreateDeclInfoForUndecoratedName(getSymbolName(sym)).first;
 
-    llvm::ms_demangle::Demangler demangler;
-    StringView name{pub->Name.begin(), pub->Name.size()};
-    llvm::ms_demangle::SymbolNode *node = demangler.parse(name);
-    if (!node)
-      return &GetTranslationUnitDecl();
-    llvm::ArrayRef<llvm::ms_demangle::Node *> name_components{
-        node->Name->Components->Nodes, node->Name->Components->Count - 1};
 
-    if (!name_components.empty()) {
-      // Render the current list of scope nodes as a fully qualified name, and
-      // look it up in the debug info as a type name.  If we find something,
-      // this is a type (which may itself be prefixed by a namespace).  If we
-      // don't, this is a list of namespaces.
-      std::string qname = RenderScopeList(name_components);
-      std::vector<TypeIndex> matches = m_index.tpi().findRecordsByName(qname);
-      while (!matches.empty()) {
-        clang::QualType qt = GetOrCreateType(matches.back());
-        clang::TagDecl *tag = qt->getAsTagDecl();
-        if (tag)
-          return clang::TagDecl::castToDeclContext(tag);
-        matches.pop_back();
-      }
-    }
 
-    // It's not a type.  It must be a series of namespaces.
-    clang::DeclContext *context = &GetTranslationUnitDecl();
-    while (!name_components.empty()) {
-      std::string ns = name_components.front()->toString();
-      context = m_clang.GetUniqueNamespaceDeclaration(ns.c_str(), context);
-      name_components = name_components.drop_front();
-    }
-    return context;
-  }
+
+clang::DeclContext *PdbAstBuilder::GetParentDeclContext(PdbSymUid uid) {
+  // We must do this *without* calling GetOrCreate on the current uid, as
+  // that would be an infinite recursion.
+  switch (uid.kind()) {
+  case PdbSymUidKind::CompilandSym: {
+    llvm::Optional<PdbCompilandSymId> scope =
+        FindSymbolScope(m_index, uid.asCompilandSym());
+    if (scope)
+      return GetOrCreateDeclContextForUid(*scope);
+
+    CVSymbol sym = m_index.ReadSymbolRecord(uid.asCompilandSym());
+    return GetParentDeclContextForSymbol(sym);
+  }
   case PdbSymUidKind::Type: {
     // It could be a namespace, class, or global.  We don't support nested
     // functions yet.  Anyway, we just need to consult the parent type map.
     PdbTypeSymId type_id = uid.asTypeSym();
     auto iter = m_parent_types.find(type_id.index);
     if (iter == m_parent_types.end())
       return &GetTranslationUnitDecl();
     return GetOrCreateDeclContextForUid(PdbTypeSymId(iter->second));
   }
   case PdbSymUidKind::FieldListMember:
     // In this case the parent DeclContext is the one for the class that this
     // member is inside of.
     break;
+  case PdbSymUidKind::GlobalSym: {
+    // If this refers to a compiland symbol, just recurse in with that symbol.
+    // The only other possibilities are S_CONSTANT and S_UDT, in which case we
+    // need to parse the undecorated name to figure out the scope, then look
+    // that up in the TPI stream.  If it's found, it's a type, othewrise it's
+    // a series of namespaces.
+    // FIXME: do this.
+    CVSymbol global = m_index.ReadSymbolRecord(uid.asGlobalSym());
+    switch (global.kind()) {
+    case SymbolKind::S_GDATA32:
+    case SymbolKind::S_LDATA32:
+      return GetParentDeclContextForSymbol(global);
+    case SymbolKind::S_PROCREF:
+    case SymbolKind::S_LPROCREF: {
+      ProcRefSym ref{global.kind()};
+      llvm::cantFail(
+          SymbolDeserializer::deserializeAs<ProcRefSym>(global, ref));
+      PdbCompilandSymId cu_sym_id{ref.modi(), ref.SymOffset};
+      return GetParentDeclContext(cu_sym_id);
+    }
+    case SymbolKind::S_CONSTANT:
+    case SymbolKind::S_UDT:
+      return CreateDeclInfoForUndecoratedName(getSymbolName(global)).first;
+    default:
+      break;
+    }
+    break;
+  }
   default:
     break;
   }
   return &GetTranslationUnitDecl();
 }
 
 bool PdbAstBuilder::CompleteType(clang::QualType qt) {
   clang::TagDecl *tag = qt->getAsTagDecl();
if (bt == lldb::eBasicTypeInvalid)
     return {};
 
   return GetBasicType(bt);
 }
 
 clang::QualType PdbAstBuilder::CreatePointerType(const PointerRecord &pointer) {
   clang::QualType pointee_type = GetOrCreateType(pointer.ReferentType);
 
+  // This can happen for pointers to LF_VTSHAPE records, which we shouldn't
+  // create in the AST.
+  if (pointee_type.isNull())
+    return {};
+
   if (pointer.isPointerToMember()) {
     MemberPointerInfo mpi = pointer.getMemberInfo();
     clang::QualType class_type = GetOrCreateType(mpi.ContainingType);
 
     return m_clang.getASTContext()->getMemberPointerType(
         pointee_type, class_type.getTypePtr());
   }
 
clang::QualType PdbAstBuilder::CreatePointerType(const PointerRecord &pointer) {
   if ((pointer.getOptions() & PointerOptions::Restrict) != PointerOptions::None)
     pointer_type.addRestrict();
 
   return pointer_type;
 }
 
 clang::QualType
 PdbAstBuilder::CreateModifierType(const ModifierRecord &modifier) {
-
   clang::QualType unmodified_type = GetOrCreateType(modifier.ModifiedType);
+  if (unmodified_type.isNull())
+    return {};
 
   if ((modifier.Modifiers & ModifierOptions::Const) != ModifierOptions::None)
     unmodified_type.addConst();
   if ((modifier.Modifiers & ModifierOptions::Volatile) != ModifierOptions::None)
     unmodified_type.addVolatile();
 
   return unmodified_type;
 }

 clang::VarDecl *PdbAstBuilder::GetOrCreateVariableDecl(PdbGlobalSymId var_id) {
   if (clang::Decl *decl = TryGetDecl(var_id))
     return llvm::dyn_cast<clang::VarDecl>(decl);
 
   CVSymbol sym = m_index.ReadSymbolRecord(var_id);
   return CreateVariableDecl(PdbSymUid(var_id), sym, GetTranslationUnitDecl());
 }
 
+clang::TypedefNameDecl *
+PdbAstBuilder::GetOrCreateTypedefDecl(PdbGlobalSymId id) {
+  if (clang::Decl *decl = TryGetDecl(id))
+    return llvm::dyn_cast<clang::TypedefNameDecl>(decl);
+
+  CVSymbol sym = m_index.ReadSymbolRecord(id);
+  lldbassert(sym.kind() == S_UDT);
+  UDTSym udt = llvm::cantFail(SymbolDeserializer::deserializeAs<UDTSym>(sym));
+
+  clang::DeclContext *scope = GetParentDeclContext(id);
+
+  PdbTypeSymId real_type_id{udt.Type, false};
+  clang::QualType qt = GetOrCreateType(real_type_id);
+
+  std::string uname = DropNameScope(udt.Name);
+
+  CompilerType ct = m_clang.CreateTypedefType(ToCompilerType(qt), uname.c_str(),
+                                              ToCompilerDeclContext(*scope));
+  clang::TypedefNameDecl *tnd = m_clang.GetAsTypedefDecl(ct);
+  DeclStatus status;
+  status.resolved = true;
+  status.uid = toOpaqueUid(id);
+  m_decl_to_status.insert({tnd, status});
+  return tnd;
+}
+
 clang::QualType PdbAstBuilder::GetBasicType(lldb::BasicType type) {
   CompilerType ct = m_clang.GetBasicType(type);
   return clang::QualType::getFromOpaquePtr(ct.GetOpaqueQualType());
 }
 
 clang::QualType PdbAstBuilder::CreateType(PdbTypeSymId type) {
   if (type.index.isSimple())
     return CreateSimpleType(type.index);

lldb/source/Plugins/SymbolFile/NativePDB/PdbUtil.h

const llvm::codeview::EnumRecord &asEnum() const {
     return cvenum;
   }
 
   const llvm::codeview::UnionRecord &asUnion() const {
     assert(m_kind == Union);
     return cvunion;
   }
 
+  llvm::StringRef name() const {
+    if (m_kind == Struct || m_kind == Union)
+      return cvclass.Name;
+    if (m_kind == Enum)
+      return cvenum.Name;
+    return cvunion.Name;
+  }
+
 private:
   CVTagRecord(llvm::codeview::ClassRecord &&c);
   CVTagRecord(llvm::codeview::UnionRecord &&u);
   CVTagRecord(llvm::codeview::EnumRecord &&e);
   union {
     llvm::codeview::ClassRecord cvclass;
     llvm::codeview::EnumRecord cvenum;
     llvm::codeview::UnionRecord cvunion;

lldb/source/Plugins/SymbolFile/NativePDB/PdbUtil.cpp

 #include "DWARFLocationExpression.h"
 #include "PdbIndex.h"
 #include "PdbSymUid.h"
 
 #include "llvm/DebugInfo/CodeView/SymbolDeserializer.h"
 #include "llvm/DebugInfo/CodeView/TypeDeserializer.h"
 #include "llvm/DebugInfo/PDB/Native/TpiStream.h"
 
+#include "Plugins/Language/CPlusPlus/MSVCUndecoratedNameParser.h"
 #include "lldb/Utility/LLDBAssert.h"
-
 #include "lldb/lldb-enumerations.h"
 
 using namespace lldb_private;
 using namespace lldb_private::npdb;
 using namespace llvm::codeview;
 using namespace llvm::pdb;
 
 static Variable::RangeList

 TypeIndex lldb_private::npdb::LookThroughModifierRecord(CVType modifier) {
   lldbassert(modifier.kind() == LF_MODIFIER);
   ModifierRecord mr;
   llvm::cantFail(TypeDeserializer::deserializeAs<ModifierRecord>(modifier, mr));
   return mr.ModifiedType;
 }
 
 llvm::StringRef lldb_private::npdb::DropNameScope(llvm::StringRef name) {
-  // Not all PDB names can be parsed with CPlusPlusNameParser.
-  // E.g. it fails on names containing `anonymous namespace'.
-  // So we simply drop everything before '::'
-
-  auto offset = name.rfind("::");
-  if (offset == llvm::StringRef::npos)
-    return name;
-  assert(offset + 2 <= name.size());
-
-  return name.substr(offset + 2);
+  return MSVCUndecoratedNameParser::DropScope(name);
 }
 
 VariableInfo lldb_private::npdb::GetVariableNameInfo(CVSymbol sym) {
   VariableInfo result;
 
   if (sym.kind() == S_REGREL32) {
     RegRelativeSym reg(SymbolRecordKind::RegRelativeSym);
     cantFail(SymbolDeserializer::deserializeAs<RegRelativeSym>(sym, reg));
if (loc_specifier_cvs.kind() == S_DEFRANGE_FRAMEPOINTER_REL) {
       cantFail(SymbolDeserializer::deserializeAs<DefRangeFramePointerRelSym>(
           loc_specifier_cvs, loc));
       // FIXME: The register needs to come from the S_FRAMEPROC symbol.
       result.location =
           MakeRegRelLocationExpression(RegisterId::RSP, loc.Offset, module);
       result.ranges = MakeRangeList(index, loc.Range, loc.Gaps);
     } else {
       // FIXME: Handle other kinds
-      llvm::APSInt value;
-      value = 42;
-      result.location = MakeConstantLocationExpression(
-          TypeIndex::Int32(), index.tpi(), value, module);
     }
     return result;
   }
   llvm_unreachable("Symbol is not a local variable!");
   return result;
 }
 
 lldb::BasicType

lldb/source/Plugins/SymbolFile/NativePDB/SymbolFileNativePDB.h

private:
   lldb::CompUnitSP GetOrCreateCompileUnit(const CompilandIndexItem &cci);
   lldb::TypeSP GetOrCreateType(PdbTypeSymId type_id);
   lldb::TypeSP GetOrCreateType(llvm::codeview::TypeIndex ti);
   lldb::VariableSP GetOrCreateGlobalVariable(PdbGlobalSymId var_id);
   Block &GetOrCreateBlock(PdbCompilandSymId block_id);
   lldb::VariableSP GetOrCreateLocalVariable(PdbCompilandSymId scope_id,
                                             PdbCompilandSymId var_id,
                                             bool is_param);
+  lldb::TypeSP GetOrCreateTypedef(PdbGlobalSymId id);
 
   lldb::FunctionSP CreateFunction(PdbCompilandSymId func_id,
                                   CompileUnit &comp_unit);
   Block &CreateBlock(PdbCompilandSymId block_id);
   lldb::VariableSP CreateLocalVariable(PdbCompilandSymId scope_id,
                                        PdbCompilandSymId var_id, bool is_param);
+  lldb::TypeSP CreateTypedef(PdbGlobalSymId id);
   lldb::CompUnitSP CreateCompileUnit(const CompilandIndexItem &cci);
   lldb::TypeSP CreateType(PdbTypeSymId type_id, CompilerType ct);
   lldb::TypeSP CreateAndCacheType(PdbTypeSymId type_id);
   lldb::VariableSP CreateGlobalVariable(PdbGlobalSymId var_id);
   lldb::VariableSP CreateConstantSymbol(PdbGlobalSymId var_id,
                                         const llvm::codeview::CVSymbol &cvs);
   size_t ParseVariablesForCompileUnit(CompileUnit &comp_unit,
                                       VariableList &variables);
   size_t ParseVariablesForBlock(PdbCompilandSymId block_id);
 
   llvm::BumpPtrAllocator m_allocator;
 
   lldb::addr_t m_obj_load_address = 0;
+  bool m_done_full_type_scan = false;
 
   std::unique_ptr<PdbIndex> m_index;
 
   std::unique_ptr<PdbAstBuilder> m_ast;
 
   llvm::DenseMap<lldb::user_id_t, lldb::VariableSP> m_global_vars;
   llvm::DenseMap<lldb::user_id_t, lldb::VariableSP> m_local_variables;
   llvm::DenseMap<lldb::user_id_t, lldb::BlockSP> m_blocks;

lldb/source/Plugins/SymbolFile/NativePDB/SymbolFileNativePDB.cpp

 #include "SymbolFileNativePDB.h"
 
 #include "clang/AST/Attr.h"
 #include "clang/AST/CharUnits.h"
 #include "clang/AST/Decl.h"
 #include "clang/AST/DeclCXX.h"
 #include "clang/AST/Type.h"
 
+#include "Plugins/Language/CPlusPlus/MSVCUndecoratedNameParser.h"
 #include "lldb/Core/Module.h"
 #include "lldb/Core/PluginManager.h"
 #include "lldb/Core/StreamBuffer.h"
 #include "lldb/Core/StreamFile.h"
 #include "lldb/Symbol/ClangASTContext.h"
 #include "lldb/Symbol/ClangASTImporter.h"
 #include "lldb/Symbol/ClangExternalASTSourceCommon.h"
 #include "lldb/Symbol/ClangUtil.h"
lldb::FunctionSP SymbolFileNativePDB::CreateFunction(PdbCompilandSymId func_id,
 
   AddressRange func_range(file_vm_addr, sol.length,
                           comp_unit.GetModule()->GetSectionList());
   if (!func_range.GetBaseAddress().IsValid())
     return nullptr;
 
   ProcSym proc(static_cast<SymbolRecordKind>(sym_record.kind()));
   cantFail(SymbolDeserializer::deserializeAs<ProcSym>(sym_record, proc));
+  if (proc.FunctionType == TypeIndex::None())
+    return nullptr;
   TypeSP func_type = GetOrCreateType(proc.FunctionType);
+  if (!func_type)
+    return nullptr;
 
   PdbTypeSymId sig_id(proc.FunctionType, false);
   Mangled mangled(proc.Name);
   FunctionSP func_sp = std::make_shared<Function>(
       &comp_unit, toOpaqueUid(func_id), toOpaqueUid(sig_id), mangled,
       func_type.get(), func_range);
 
   comp_unit.AddFunction(func_sp);
lldb::TypeSP SymbolFileNativePDB::CreateSimpleType(TypeIndex ti,
 
   Declaration decl;
   return std::make_shared<Type>(uid, this, ConstString(type_name), size,
                                 nullptr, LLDB_INVALID_UID, Type::eEncodingIsUID,
                                 decl, ct, Type::eResolveStateFull);
 }
 
 static std::string GetUnqualifiedTypeName(const TagRecord &record) {
+  if (!record.hasUniqueName()) {
+    MSVCUndecoratedNameParser parser(record.Name);
+    llvm::ArrayRef<MSVCUndecoratedNameSpecifier> specs = parser.GetSpecifiers();
+
+    return specs.back().GetBaseName();
+  }
+
   llvm::ms_demangle::Demangler demangler;
   StringView sv(record.UniqueName.begin(), record.UniqueName.size());
   llvm::ms_demangle::TagTypeNode *ttn = demangler.parseTagUniqueName(sv);
+  if (demangler.Error)
+    return record.Name;
+
   llvm::ms_demangle::IdentifierNode *idn =
       ttn->QualifiedName->getUnqualifiedIdentifier();
   return idn->toString();
 }
 
 lldb::TypeSP
 SymbolFileNativePDB::CreateClassStructUnion(PdbTypeSymId type_id,
                                             const TagRecord &record,

 TypeSP SymbolFileNativePDB::GetOrCreateType(PdbTypeSymId type_id) {
   // We can't use try_emplace / overwrite here because the process of creating
   // a type could create nested types, which could invalidate iterators.  So
   // we have to do a 2-phase lookup / insert.
   auto iter = m_types.find(toOpaqueUid(type_id));
   if (iter != m_types.end())
     return iter->second;
 
-  return CreateAndCacheType(type_id);
+  TypeSP type = CreateAndCacheType(type_id);
+  if (type)
+    m_obj_file->GetModule()->GetTypeList()->Insert(type);
+  return type;
 }
 
 VariableSP SymbolFileNativePDB::CreateGlobalVariable(PdbGlobalSymId var_id) {
   CVSymbol sym = m_index->symrecords().readRecord(var_id.offset);
   if (sym.kind() == S_CONSTANT)
     return CreateConstantSymbol(var_id, sym);
 
   lldb::ValueType scope = eValueTypeInvalid;

 }
 
 FunctionSP SymbolFileNativePDB::GetOrCreateFunction(PdbCompilandSymId func_id,
                                                     CompileUnit &comp_unit) {
   auto emplace_result = m_functions.try_emplace(toOpaqueUid(func_id), nullptr);
   if (emplace_result.second)
     emplace_result.first->second = CreateFunction(func_id, comp_unit);
 
-  lldbassert(emplace_result.first->second);
   return emplace_result.first->second;
 }
 
 CompUnitSP
 SymbolFileNativePDB::GetOrCreateCompileUnit(const CompilandIndexItem &cci) {
 
   auto emplace_result =
       m_compilands.try_emplace(toOpaqueUid(cci.m_id), nullptr);
SymbolFileNativePDB::ParseCompileUnitLanguage(const SymbolContext &sc) {
 
   return TranslateLanguage(item->m_compile_opts->getLanguage());
 }
 
 void SymbolFileNativePDB::AddSymbols(Symtab &symtab) { return; }
 
 size_t SymbolFileNativePDB::ParseCompileUnitFunctions(const SymbolContext &sc) {
   lldbassert(sc.comp_unit);
-  return false;
+
+  PdbSymUid uid{sc.comp_unit->GetID()};
+  lldbassert(uid.kind() == PdbSymUidKind::Compiland);
+  uint16_t modi = uid.asCompiland().modi;
+  CompilandIndexItem &cii = m_index->compilands().GetOrCreateCompiland(modi);
+
+  size_t count = sc.comp_unit->GetNumFunctions();
+  const CVSymbolArray &syms = cii.m_debug_stream.getSymbolArray();
+  for (auto iter = syms.begin(); iter != syms.end(); ++iter) {
+    if (iter->kind() != S_LPROC32 && iter->kind() != S_GPROC32)
+      continue;
+
+    PdbCompilandSymId sym_id{modi, iter.offset()};
+
+    FunctionSP func = GetOrCreateFunction(sym_id, *sc.comp_unit);
+  }
+
+  size_t new_count = sc.comp_unit->GetNumFunctions();
+  lldbassert(new_count >= count);
+  return new_count - count;
 }
 
 static bool NeedsResolvedCompileUnit(uint32_t resolve_scope) {
   // If any of these flags are set, we need to resolve the compile unit.
   uint32_t flags = eSymbolContextCompUnit;
   flags |= eSymbolContextVariable;
   flags |= eSymbolContextFunction;
   flags |= eSymbolContextBlock;
if (!type)
       continue;
 
     types.Insert(type);
     ++match_count;
   }
   return match_count;
 }
 
-size_t SymbolFileNativePDB::ParseTypes(const SymbolContext &sc) { return 0; }
+size_t SymbolFileNativePDB::ParseTypes(const SymbolContext &sc) {
+  // Only do the full type scan the first time.
+  if (m_done_full_type_scan)
+    return 0;
+
+  size_t old_count = m_obj_file->GetModule()->GetTypeList()->GetSize();
+  LazyRandomTypeCollection &types = m_index->tpi().typeCollection();
+
+  // First process the entire TPI stream.
+  for (auto ti = types.getFirst(); ti; ti = types.getNext(*ti)) {
+    TypeSP type = GetOrCreateType(*ti);
+    if (type)
+      (void)type->GetFullCompilerType();
+  }
+
+  // Next look for S_UDT records in the globals stream.
+  for (const uint32_t gid : m_index->globals().getGlobalsTable()) {
+    PdbGlobalSymId global{gid, false};
+    CVSymbol sym = m_index->ReadSymbolRecord(global);
+    if (sym.kind() != S_UDT)
+      continue;
+
+    UDTSym udt = llvm::cantFail(SymbolDeserializer::deserializeAs<UDTSym>(sym));
+    bool is_typedef = true;
+    if (IsTagRecord(PdbTypeSymId{udt.Type, false}, m_index->tpi())) {
+      CVType cvt = m_index->tpi().getType(udt.Type);
+      llvm::StringRef name = CVTagRecord::create(cvt).name();
+      if (name == udt.Name)
+        is_typedef = false;
+    }
+
+    if (is_typedef)
+      GetOrCreateTypedef(global);
+  }
+
+  size_t new_count = m_obj_file->GetModule()->GetTypeList()->GetSize();
+
+  m_done_full_type_scan = true;
+
+  return new_count - old_count;
+}
 
 size_t
 SymbolFileNativePDB::ParseVariablesForCompileUnit(CompileUnit &comp_unit,
                                                   VariableList &variables) {
   PdbSymUid sym_uid(comp_unit.GetID());
   lldbassert(sym_uid.kind() == PdbSymUidKind::Compiland);
   return 0;
 }
 
 VariableSP SymbolFileNativePDB::CreateLocalVariable(PdbCompilandSymId scope_id,
                                                     PdbCompilandSymId var_id,
                                                     bool is_param) {
   ModuleSP module = GetObjectFile()->GetModule();
   VariableInfo var_info = GetVariableLocationInfo(*m_index, var_id, module);
+  if (!var_info.location || !var_info.ranges)
+    return nullptr;
 
   CompilandIndexItem *cii = m_index->compilands().GetCompiland(var_id.modi);
   CompUnitSP comp_unit_sp = GetOrCreateCompileUnit(*cii);
   TypeSP type_sp = GetOrCreateType(var_info.type);
   std::string name = var_info.name.str();
   Declaration decl;
   SymbolFileTypeSP sftype =
       std::make_shared<SymbolFileType>(*this, type_sp->GetID());
VariableSP SymbolFileNativePDB::GetOrCreateLocalVariable(
     PdbCompilandSymId scope_id, PdbCompilandSymId var_id, bool is_param) {
   auto iter = m_local_variables.find(toOpaqueUid(var_id));
   if (iter != m_local_variables.end())
     return iter->second;
 
   return CreateLocalVariable(scope_id, var_id, is_param);
 }
 
+TypeSP SymbolFileNativePDB::CreateTypedef(PdbGlobalSymId id) {
+  CVSymbol sym = m_index->ReadSymbolRecord(id);
+  lldbassert(sym.kind() == SymbolKind::S_UDT);
+
+  UDTSym udt = llvm::cantFail(SymbolDeserializer::deserializeAs<UDTSym>(sym));
+
+  TypeSP target_type = GetOrCreateType(udt.Type);
+
+  (void)m_ast->GetOrCreateTypedefDecl(id);
+
+  Declaration decl;
+  return std::make_shared<lldb_private::Type>(
+      toOpaqueUid(id), this, ConstString(udt.Name), target_type->GetByteSize(),
+      nullptr, target_type->GetID(), lldb_private::Type::eEncodingIsTypedefUID,
+      decl, target_type->GetForwardCompilerType(),
+      lldb_private::Type::eResolveStateForward);
+}
+
+TypeSP SymbolFileNativePDB::GetOrCreateTypedef(PdbGlobalSymId id) {
+  auto iter = m_types.find(toOpaqueUid(id));
+  if (iter != m_types.end())
+    return iter->second;
+
+  return CreateTypedef(id);
+}
+
 size_t SymbolFileNativePDB::ParseVariablesForBlock(PdbCompilandSymId block_id) {
   Block &block = GetOrCreateBlock(block_id);
 
   size_t count = 0;
 
   CompilandIndexItem *cii = m_index->compilands().GetCompiland(block_id.modi);
   CVSymbol sym = cii->m_debug_stream.readSymbolAtOffset(block_id.offset);
   uint32_t params_remaining = 0;
while (iter != end) {
     VariableSP variable;
     switch (variable_cvs.kind()) {
     case S_REGREL32:
     case S_REGISTER:
     case S_LOCAL:
       variable = GetOrCreateLocalVariable(block_id, child_sym_id, is_param);
       if (is_param)
         --params_remaining;
+      if (variable)
         variables->AddVariableIfUnique(variable);
       break;
     default:
       break;
     }
   }
 
   // Pass false for set_children, since we call this recursively so that the
   // children will call this for themselves.