-ms-extensions: Implement __super scope specifier (PR13236).

We build a NestedNameSpecifier that records the CXXRecordDecl in which
__super appeared. Name lookup is performed in all base classes of the
recorded CXXRecordDecl. Use of __super is allowed only inside class and
member function scope.

llvm-svn: 218484

2 files changed, 23 insertions, 1 deletions

diff --git a/clang/lib/Serialization/ASTReader.cpp b/clang/lib/Serialization/ASTReader.cpp
index 93c01cb1e12..96639f37f0b 100644
--- a/clang/lib/Serialization/ASTReader.cpp
+++ b/clang/lib/Serialization/ASTReader.cpp
@@ -7927,6 +7927,12 @@ ASTReader::ReadNestedNameSpecifier(ModuleFile &F,
       // No associated value, and there can't be a prefix.
       break;
     }
+
+    case NestedNameSpecifier::Super: {
+      CXXRecordDecl *RD = ReadDeclAs<CXXRecordDecl>(F, Record, Idx);
+      NNS = NestedNameSpecifier::SuperSpecifier(Context, RD);
+      break;
+    }
     }
     Prev = NNS;
   }
@@ -7983,9 +7989,16 @@ ASTReader::ReadNestedNameSpecifierLoc(ModuleFile &F, const RecordData &Record,
       Builder.MakeGlobal(Context, ColonColonLoc);
       break;
     }
+
+    case NestedNameSpecifier::Super: {
+      CXXRecordDecl *RD = ReadDeclAs<CXXRecordDecl>(F, Record, Idx);
+      SourceRange Range = ReadSourceRange(F, Record, Idx);
+      Builder.MakeSuper(Context, RD, Range.getBegin(), Range.getEnd());
+      break;
+    }
     }
   }
-  
+
   return Builder.getWithLocInContext(Context);
 }
 
diff --git a/clang/lib/Serialization/ASTWriter.cpp b/clang/lib/Serialization/ASTWriter.cpp
index 0b65d0a571d..04a39c07aaf 100644
--- a/clang/lib/Serialization/ASTWriter.cpp
+++ b/clang/lib/Serialization/ASTWriter.cpp
@@ -5245,6 +5245,10 @@ void ASTWriter::AddNestedNameSpecifier(NestedNameSpecifier *NNS,
     case NestedNameSpecifier::Global:
       // Don't need to write an associated value.
       break;
+
+    case NestedNameSpecifier::Super:
+      AddDeclRef(NNS->getAsRecordDecl(), Record);
+      break;
     }
   }
 }
@@ -5294,6 +5298,11 @@ void ASTWriter::AddNestedNameSpecifierLoc(NestedNameSpecifierLoc NNS,
     case NestedNameSpecifier::Global:
       AddSourceLocation(NNS.getLocalSourceRange().getEnd(), Record);
       break;
+
+    case NestedNameSpecifier::Super:
+      AddDeclRef(NNS.getNestedNameSpecifier()->getAsRecordDecl(), Record);
+      AddSourceRange(NNS.getLocalSourceRange(), Record);
+      break;
     }
   }
 }