[-cxx-abi microsoft] Mangle local TagDecls appropriately

Summary:
When selecting a mangling for an anonymous tag type:
- We should first try it's typedef'd name.
- If that doesn't work, we should mangle in the name of the declarator
  that specified it as a declaration specifier.
- If that doesn't work, fall back to a static mangling of
  <unnamed-type>.

This should make our anonymous type mangling compatible.

This partially fixes PR16994; we would need to have an implementation of
scope numbering to get it right (a separate issue).

Reviewers: rnk, rsmith, rjmccall, cdavis5x

CC: cfe-commits

Differential Revision: http://llvm-reviews.chandlerc.com/D1540

llvm-svn: 190892

2 files changed, 5 insertions, 3 deletions

diff --git a/clang/lib/Serialization/ASTReaderDecl.cpp b/clang/lib/Serialization/ASTReaderDecl.cpp
index 791f3c9f8ca..a9225fc81be 100644
--- a/clang/lib/Serialization/ASTReaderDecl.cpp
+++ b/clang/lib/Serialization/ASTReaderDecl.cpp
@@ -464,9 +464,9 @@ ASTDeclReader::RedeclarableResult ASTDeclReader::VisitTagDecl(TagDecl *TD) {
   if (Record[Idx++]) { // hasExtInfo
     TagDecl::ExtInfo *Info = new (Reader.getContext()) TagDecl::ExtInfo();
     ReadQualifierInfo(*Info, Record, Idx);
-    TD->TypedefNameDeclOrQualifier = Info;
+    TD->NamedDeclOrQualifier = Info;
   } else
-    TD->setTypedefNameForAnonDecl(ReadDeclAs<TypedefNameDecl>(Record, Idx));
+    TD->NamedDeclOrQualifier = ReadDeclAs<NamedDecl>(Record, Idx);
 
   mergeRedeclarable(TD, Redecl);
   return Redecl;
diff --git a/clang/lib/Serialization/ASTWriterDecl.cpp b/clang/lib/Serialization/ASTWriterDecl.cpp
index dc2ed465758..a9d8a03f717 100644
--- a/clang/lib/Serialization/ASTWriterDecl.cpp
+++ b/clang/lib/Serialization/ASTWriterDecl.cpp
@@ -229,8 +229,10 @@ void ASTDeclWriter::VisitTagDecl(TagDecl *D) {
   Record.push_back(D->hasExtInfo());
   if (D->hasExtInfo())
     Writer.AddQualifierInfo(*D->getExtInfo(), Record);
-  else
+  else if (D->getTypedefNameForAnonDecl())
     Writer.AddDeclRef(D->getTypedefNameForAnonDecl(), Record);
+  else if (D->hasDeclaratorForAnonDecl())
+    Writer.AddDeclRef(D->getDeclaratorForAnonDecl(), Record);
 }
 
 void ASTDeclWriter::VisitEnumDecl(EnumDecl *D) {