[NativePDB] Add anonymous namespaces support

Summary:
This patch adds anonymous namespaces support to the native PDB plugin.

I had to reference from the main function variables of the types that are inside
of the anonymous namespace to include them in debug info. Without the references
they are not included. I think it's because they are static, then are visible
only in the current translation unit, so they are not needed without any
references to them.

There is also the problem case with variables of types that are nested in
template structs. For now I've left FIXME in the test because this case is not
related to the change.

Reviewers: zturner, asmith, labath, stella.stamenova, amccarth

Reviewed By: amccarth

Subscribers: zloyrobot, aprantl, teemperor, lldb-commits, leonid.mashinskiy

Tags: #lldb

Differential Revision: https://reviews.llvm.org/D60817

llvm-svn: 358873

2 files changed, 13 insertions, 7 deletions

diff --git a/lldb/source/Plugins/SymbolFile/NativePDB/PdbAstBuilder.cpp b/lldb/source/Plugins/SymbolFile/NativePDB/PdbAstBuilder.cpp
index 6e5640c1ea0..e8fd59c7b74 100644
--- a/lldb/source/Plugins/SymbolFile/NativePDB/PdbAstBuilder.cpp
+++ b/lldb/source/Plugins/SymbolFile/NativePDB/PdbAstBuilder.cpp
@@ -205,6 +205,10 @@ GetNestedTagDefinition(const NestedTypeRecord &Record,
   return std::move(child);
 }
 
+static bool IsAnonymousNamespaceName(llvm::StringRef name) {
+  return name == "`anonymous namespace'" || name == "`anonymous-namespace'";
+}
+
 PdbAstBuilder::PdbAstBuilder(ObjectFile &obj, PdbIndex &index)
     : m_index(index), m_clang(GetClangASTContext(obj)) {
   BuildParentMap();
@@ -256,7 +260,7 @@ PdbAstBuilder::CreateDeclInfoForType(const TagRecord &record, TypeIndex ti) {
     for (llvm::ms_demangle::Node *scope : scopes) {
       auto *nii = static_cast<llvm::ms_demangle::NamedIdentifierNode *>(scope);
       std::string str = nii->toString();
-      context = m_clang.GetUniqueNamespaceDeclaration(str.c_str(), context);
+      context = GetOrCreateNamespaceDecl(str.c_str(), *context);
     }
     return {context, uname};
   }
@@ -525,7 +529,7 @@ PdbAstBuilder::CreateDeclInfoForUndecoratedName(llvm::StringRef name) {
   // 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);
+    context = GetOrCreateNamespaceDecl(ns_name.c_str(), *context);
   }
   return {context, uname};
 }
@@ -568,7 +572,7 @@ PdbAstBuilder::GetParentDeclContextForSymbol(const CVSymbol &sym) {
   clang::DeclContext *context = &GetTranslationUnitDecl();
   while (!name_components.empty()) {
     std::string ns = name_components.front()->toString();
-    context = m_clang.GetUniqueNamespaceDeclaration(ns.c_str(), context);
+    context = GetOrCreateNamespaceDecl(ns.c_str(), *context);
     name_components = name_components.drop_front();
   }
   return context;
@@ -805,9 +809,10 @@ clang::Decl *PdbAstBuilder::TryGetDecl(PdbSymUid uid) const {
 }
 
 clang::NamespaceDecl *
-PdbAstBuilder::GetOrCreateNamespaceDecl(llvm::StringRef name,
+PdbAstBuilder::GetOrCreateNamespaceDecl(const char *name,
                                         clang::DeclContext &context) {
-  return m_clang.GetUniqueNamespaceDeclaration(name.str().c_str(), &context);
+  return m_clang.GetUniqueNamespaceDeclaration(
+      IsAnonymousNamespaceName(name) ? nullptr : name, &context);
 }
 
 clang::BlockDecl *
diff --git a/lldb/source/Plugins/SymbolFile/NativePDB/PdbAstBuilder.h b/lldb/source/Plugins/SymbolFile/NativePDB/PdbAstBuilder.h
index 60eece71661..e4241594845 100644
--- a/lldb/source/Plugins/SymbolFile/NativePDB/PdbAstBuilder.h
+++ b/lldb/source/Plugins/SymbolFile/NativePDB/PdbAstBuilder.h
@@ -59,8 +59,6 @@ public:
   clang::DeclContext *GetOrCreateDeclContextForUid(PdbSymUid uid);
   clang::DeclContext *GetParentDeclContext(PdbSymUid uid);
 
-  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,
@@ -114,6 +112,9 @@ private:
   clang::DeclContext *
   GetParentDeclContextForSymbol(const llvm::codeview::CVSymbol &sym);
 
+  clang::NamespaceDecl *GetOrCreateNamespaceDecl(const char *name,
+                                                 clang::DeclContext &context);
+
   void ParseAllNamespacesPlusChildrenOf(llvm::Optional<llvm::StringRef> parent);
   void ParseDeclsForSimpleContext(clang::DeclContext &context);
   void ParseBlockChildren(PdbCompilandSymId block_id);