[Attr] Support _attribute__ ((fallthrough))

Summary: Fixed extraneous matches of non-NullStmt

Reviewers: aaron.ballman, rsmith, efriedma, xbolva00

Reviewed By: aaron.ballman, rsmith, xbolva00

Subscribers: riccibruno, arphaman, ziangwan, ojeda, xbolva00, nickdesaulniers, cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D64838

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@369414 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 19 insertions, 11 deletions

diff --git a/lib/Parse/ParseDecl.cpp b/lib/Parse/ParseDecl.cpp
index 5fc36e86b1..71d1c3b8f4 100644
--- a/lib/Parse/ParseDecl.cpp
+++ b/lib/Parse/ParseDecl.cpp
@@ -1741,9 +1741,10 @@ void Parser::stripTypeAttributesOffDeclSpec(ParsedAttributesWithRange &Attrs,
 /// [C++11/C11] static_assert-declaration
 ///         others... [FIXME]
 ///
-Parser::DeclGroupPtrTy Parser::ParseDeclaration(DeclaratorContext Context,
-                                                SourceLocation &DeclEnd,
-                                          ParsedAttributesWithRange &attrs) {
+Parser::DeclGroupPtrTy
+Parser::ParseDeclaration(DeclaratorContext Context, SourceLocation &DeclEnd,
+                         ParsedAttributesWithRange &attrs,
+                         SourceLocation *DeclSpecStart) {
   ParenBraceBracketBalancer BalancerRAIIObj(*this);
   // Must temporarily exit the objective-c container scope for
   // parsing c none objective-c decls.
@@ -1763,8 +1764,8 @@ Parser::DeclGroupPtrTy Parser::ParseDeclaration(DeclaratorContext Context,
       SourceLocation InlineLoc = ConsumeToken();
       return ParseNamespace(Context, DeclEnd, InlineLoc);
     }
-    return ParseSimpleDeclaration(Context, DeclEnd, attrs,
-                                  true);
+    return ParseSimpleDeclaration(Context, DeclEnd, attrs, true, nullptr,
+                                  DeclSpecStart);
   case tok::kw_namespace:
     ProhibitAttributes(attrs);
     return ParseNamespace(Context, DeclEnd);
@@ -1777,7 +1778,8 @@ Parser::DeclGroupPtrTy Parser::ParseDeclaration(DeclaratorContext Context,
     SingleDecl = ParseStaticAssertDeclaration(DeclEnd);
     break;
   default:
-    return ParseSimpleDeclaration(Context, DeclEnd, attrs, true);
+    return ParseSimpleDeclaration(Context, DeclEnd, attrs, true, nullptr,
+                                  DeclSpecStart);
   }
 
   // This routine returns a DeclGroup, if the thing we parsed only contains a
@@ -1802,11 +1804,14 @@ Parser::DeclGroupPtrTy Parser::ParseDeclaration(DeclaratorContext Context,
 /// If FRI is non-null, we might be parsing a for-range-declaration instead
 /// of a simple-declaration. If we find that we are, we also parse the
 /// for-range-initializer, and place it here.
-Parser::DeclGroupPtrTy
-Parser::ParseSimpleDeclaration(DeclaratorContext Context,
-                               SourceLocation &DeclEnd,
-                               ParsedAttributesWithRange &Attrs,
-                               bool RequireSemi, ForRangeInit *FRI) {
+///
+/// DeclSpecStart is used when decl-specifiers are parsed before parsing
+/// the Declaration. The SourceLocation for this Decl is set to
+/// DeclSpecStart if DeclSpecStart is non-null.
+Parser::DeclGroupPtrTy Parser::ParseSimpleDeclaration(
+    DeclaratorContext Context, SourceLocation &DeclEnd,
+    ParsedAttributesWithRange &Attrs, bool RequireSemi, ForRangeInit *FRI,
+    SourceLocation *DeclSpecStart) {
   // Parse the common declaration-specifiers piece.
   ParsingDeclSpec DS(*this);
 
@@ -1836,6 +1841,9 @@ Parser::ParseSimpleDeclaration(DeclaratorContext Context,
     return Actions.ConvertDeclToDeclGroup(TheDecl);
   }
 
+  if (DeclSpecStart)
+    DS.SetRangeStart(*DeclSpecStart);
+
   DS.takeAttributesFrom(Attrs);
   return ParseDeclGroup(DS, Context, &DeclEnd, FRI);
 }