[Driver] Check type of InputElement before request a error message. If the

element is a FileNode, request error description. If the element is Group,
print hard coded error message. We need to implement a better diagnostics
here but even current solution is better than a segmentation fault output.

llvm-svn: 207691

1 files changed, 7 insertions, 2 deletions

diff --git a/lld/lib/Driver/Driver.cpp b/lld/lib/Driver/Driver.cpp
index 1122ae9bc54..f87bf5b16c3 100644
--- a/lld/lib/Driver/Driver.cpp
+++ b/lld/lib/Driver/Driver.cpp
@@ -63,8 +63,13 @@ bool Driver::link(LinkingContext &context, raw_ostream &diagnostics) {
       llvm::raw_string_ostream stream(buf);
 
       if (error_code ec = ie->parse(context, stream)) {
-        FileNode *fileNode = dyn_cast<FileNode>(ie.get());
-        stream << fileNode->errStr(ec) << "\n";
+        if (FileNode *fileNode = dyn_cast<FileNode>(ie.get()))
+          stream << fileNode->errStr(ec) << "\n";
+        else if (dyn_cast<Group>(ie.get()))
+          // FIXME: We need a better diagnostics here
+          stream << "Cannot parse group input element\n";
+        else
+          llvm_unreachable("Unknown type of input element");
         fail = true;
       }