4 files changed, 17 insertions, 0 deletions
diff --git a/lib/Sema/AttributeList.cpp b/lib/Sema/AttributeList.cpp
index 983c0e0c28..619a5b961b 100644
--- a/lib/Sema/AttributeList.cpp
+++ b/lib/Sema/AttributeList.cpp
@@ -202,5 +202,6 @@ AttributeList::Kind AttributeList::getKind(const IdentifierInfo *Name) {
     .Case("opencl_kernel_function", AT_opencl_kernel_function)
     .Case("uuid", AT_uuid)
     .Case("pcs", AT_pcs)
+    .Case("ms_struct", AT_MsStruct)
     .Default(UnknownAttribute);
 }
diff --git a/lib/Sema/SemaAttr.cpp b/lib/Sema/SemaAttr.cpp
index 7a50356fed..53dd297aeb 100644
--- a/lib/Sema/SemaAttr.cpp
+++ b/lib/Sema/SemaAttr.cpp
@@ -129,6 +129,12 @@ void Sema::AddAlignmentAttributesForRecord(RecordDecl *RD) {
   }
 }
 
+void Sema::AddMsStructLayoutForRecord(RecordDecl *RD) {
+  if (!MSStructPragmaOn)
+    return;
+  RD->addAttr(::new (Context) MsStructAttr(SourceLocation(), Context));
+}
+
 void Sema::ActOnPragmaOptionsAlign(PragmaOptionsAlignKind Kind,
                                    SourceLocation PragmaLoc,
                                    SourceLocation KindLoc) {
diff --git a/lib/Sema/SemaDecl.cpp b/lib/Sema/SemaDecl.cpp
index 200f8ce037..6c25ddfca5 100644
--- a/lib/Sema/SemaDecl.cpp
+++ b/lib/Sema/SemaDecl.cpp
@@ -7094,6 +7094,8 @@ CreateNewDecl:
     // the #pragma tokens are effectively skipped over during the
     // parsing of the struct).
     AddAlignmentAttributesForRecord(RD);
+    
+    AddMsStructLayoutForRecord(RD);
   }
 
   // If this is a specialization of a member class (of a class template),
diff --git a/lib/Sema/SemaDeclAttr.cpp b/lib/Sema/SemaDeclAttr.cpp
index 746c5dbb37..7f93ab72d6 100644
--- a/lib/Sema/SemaDeclAttr.cpp
+++ b/lib/Sema/SemaDeclAttr.cpp
@@ -261,6 +261,13 @@ static void HandlePackedAttr(Decl *d, const AttributeList &Attr, Sema &S) {
     S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << Attr.getName();
 }
 
+static void HandleMsStructAttr(Decl *d, const AttributeList &Attr, Sema &S) {
+  if (TagDecl *TD = dyn_cast<TagDecl>(d))
+    TD->addAttr(::new (S.Context) MsStructAttr(Attr.getLoc(), S.Context));
+  else
+    S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << Attr.getName();
+}
+
 static void HandleIBAction(Decl *d, const AttributeList &Attr, Sema &S) {
   // check the attribute arguments.
   if (Attr.getNumArgs() > 0) {
@@ -2890,6 +2897,7 @@ static void ProcessInheritableDeclAttr(Scope *scope, Decl *D,
       HandleInitPriorityAttr(D, Attr, S); break;
       
   case AttributeList::AT_packed:      HandlePackedAttr      (D, Attr, S); break;
+  case AttributeList::AT_MsStruct:    HandleMsStructAttr    (D, Attr, S); break;
   case AttributeList::AT_section:     HandleSectionAttr     (D, Attr, S); break;
   case AttributeList::AT_unavailable: HandleUnavailableAttr (D, Attr, S); break;
   case AttributeList::AT_unused:      HandleUnusedAttr      (D, Attr, S); break;