[Parser] Handle __pragma(pack, etc. after type definitions

Support certain MS pragmas right after the closing curly brace of a
class.  Clang did not expect __pragma in this position.

This fixes PR28094.

llvm-svn: 272628

3 files changed, 27 insertions, 0 deletions

diff --git a/clang/lib/Parse/ParseDecl.cpp b/clang/lib/Parse/ParseDecl.cpp
index 746f996d368..be694901b91 100644
--- a/clang/lib/Parse/ParseDecl.cpp
+++ b/clang/lib/Parse/ParseDecl.cpp
@@ -3453,6 +3453,22 @@ void Parser::ParseDeclarationSpecifiers(DeclSpec &DS,
       ParseDecltypeSpecifier(DS);
       continue;
 
+    case tok::annot_pragma_pack:
+      HandlePragmaPack();
+      continue;
+
+    case tok::annot_pragma_ms_pragma:
+      HandlePragmaMSPragma();
+      continue;
+
+    case tok::annot_pragma_ms_vtordisp:
+      HandlePragmaMSVtorDisp();
+      continue;
+
+    case tok::annot_pragma_ms_pointers_to_members:
+      HandlePragmaMSPointersToMembers();
+      continue;
+
     case tok::kw___underlying_type:
       ParseUnderlyingTypeSpecifier(DS);
       continue;
diff --git a/clang/lib/Parse/ParseDeclCXX.cpp b/clang/lib/Parse/ParseDeclCXX.cpp
index b80f9ee1b02..d55b2d9442c 100644
--- a/clang/lib/Parse/ParseDeclCXX.cpp
+++ b/clang/lib/Parse/ParseDeclCXX.cpp
@@ -1100,6 +1100,13 @@ bool Parser::isValidAfterTypeSpecifier(bool CouldBeBitfield) {
   // FIXME: we should emit semantic diagnostic when declaration
   // attribute is in type attribute position.
   case tok::kw___attribute:     // struct foo __attribute__((used)) x;
+  case tok::annot_pragma_pack:  // struct foo {...} _Pragma(pack(pop));
+  // struct foo {...} _Pragma(section(...));
+  case tok::annot_pragma_ms_pragma:
+  // struct foo {...} _Pragma(vtordisp(pop));
+  case tok::annot_pragma_ms_vtordisp:
+  // struct foo {...} _Pragma(pointers_to_members(...));
+  case tok::annot_pragma_ms_pointers_to_members:
     return true;
   case tok::colon:
     return CouldBeBitfield;     // enum E { ... }   :         2;
diff --git a/clang/test/Parser/pragma-pack.c b/clang/test/Parser/pragma-pack.c
index 172a332510a..0859f4157ce 100644
--- a/clang/test/Parser/pragma-pack.c
+++ b/clang/test/Parser/pragma-pack.c
@@ -44,3 +44,7 @@ struct S
 #pragma pack()
   int e;
 };
+
+_Pragma("pack(push, 1)") struct PR28094 {
+  int a;
+} _Pragma("pack(pop)");