Fix rdar://6480479 - [parser] infinite loop on invalid input

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@61975 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 12 insertions, 0 deletions

diff --git a/lib/Parse/ParseObjc.cpp b/lib/Parse/ParseObjc.cpp
index f52ecfb7fb..90a1494966 100644
--- a/lib/Parse/ParseObjc.cpp
+++ b/lib/Parse/ParseObjc.cpp
@@ -255,6 +255,12 @@ void Parser::ParseObjCInterfaceDeclList(DeclTy *interfaceDecl,
     
     // If we don't have an @ directive, parse it as a function definition.
     if (Tok.isNot(tok::at)) {
+      // The code below does not consume '}'s because it is afraid of eating the
+      // end of a namespace.  Because of the way this code is structured, an
+      // erroneous r_brace would cause an infinite loop if not handled here.
+      if (Tok.is(tok::r_brace))
+        break;
+      
       // FIXME: as the name implies, this rule allows function definitions.
       // We could pass a flag or check for functions during semantic analysis.
       ParseDeclarationOrFunctionDefinition();
diff --git a/test/Parser/objc-quirks.m b/test/Parser/objc-quirks.m
index b726d9a827..c5fe8bb1a1 100644
--- a/test/Parser/objc-quirks.m
+++ b/test/Parser/objc-quirks.m
@@ -2,3 +2,9 @@
 
 // FIXME: This is a horrible error message here. Fix.
 int @"s" = 5;  // expected-error {{prefix attribute must be}}
+
+
+// rdar://6480479
+@interface A
+}; // expected-error {{missing @end}} expected-error {{expected external declaration}}
+