Avoid crash if default argument parsed with errors.

If function parameters have default values, and that of the second
parameter is parsed with errors, function declaration would have
a parameter without default value that follows a parameter with
that. Such declaration breaks logic of selecting overloaded
function. As a solution, put opaque object as default value in such case.

This patch fixes PR20055.

Differential Revision: http://reviews.llvm.org/D4378

llvm-svn: 213594

1 files changed, 2 insertions, 1 deletions

diff --git a/clang/lib/Parse/ParseCXXInlineMethods.cpp b/clang/lib/Parse/ParseCXXInlineMethods.cpp
index 310e2b4cd8a..30a9120a510 100644
--- a/clang/lib/Parse/ParseCXXInlineMethods.cpp
+++ b/clang/lib/Parse/ParseCXXInlineMethods.cpp
@@ -337,7 +337,8 @@ void Parser::ParseLexedMethodDeclaration(LateParsedMethodDeclaration &LM) {
       } else
         DefArgResult = ParseAssignmentExpression();
       if (DefArgResult.isInvalid())
-        Actions.ActOnParamDefaultArgumentError(LM.DefaultArgs[I].Param);
+        Actions.ActOnParamDefaultArgumentError(LM.DefaultArgs[I].Param,
+                                               EqualLoc);
       else {
         if (!TryConsumeToken(tok::cxx_defaultarg_end)) {
           // The last two tokens are the terminator and the saved value of