From 87f106462ce49a4a9b812b9de92aadd4e54567bd Mon Sep 17 00:00:00 2001
From: Douglas Gregor <dgregor@apple.com>
Date: Thu, 14 Apr 2011 23:19:27 +0000
Subject: [PATCH] If the declaration of a C++ member function with an inline
 definition is so broken that Sema can't form a declaration for it, don't
 bother trying to parse the definition later. Fixes <rdar://problem/9221993>.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@129547 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Parse/ParseCXXInlineMethods.cpp |  8 ++++++++
 test/Parser/cxx-member-crash.cpp    | 15 +++++++++++++++
 2 files changed, 23 insertions(+)
 create mode 100644 test/Parser/cxx-member-crash.cpp

diff --git a/lib/Parse/ParseCXXInlineMethods.cpp b/lib/Parse/ParseCXXInlineMethods.cpp
index fc1902ca7f..93568efebc 100644
--- a/lib/Parse/ParseCXXInlineMethods.cpp
+++ b/lib/Parse/ParseCXXInlineMethods.cpp
@@ -87,6 +87,14 @@ Decl *Parser::ParseCXXInlineMethodDef(AccessSpecifier AS, ParsingDeclarator &D,
     }
   }
 
+
+  if (!FnD) {
+    // If semantic analysis could not build a function declaration,
+    // just throw away the late-parsed declaration.
+    delete getCurrentClass().LateParsedDeclarations.back();
+    getCurrentClass().LateParsedDeclarations.pop_back();
+  }
+
   return FnD;
 }
 
diff --git a/test/Parser/cxx-member-crash.cpp b/test/Parser/cxx-member-crash.cpp
new file mode 100644
index 0000000000..2b31a608a5
--- /dev/null
+++ b/test/Parser/cxx-member-crash.cpp
@@ -0,0 +1,15 @@
+// RUN: %clang_cc1 -fsyntax-only %s 2>&1|FileCheck %s
+
+// <rdar://problem/9221993>
+
+// We only care to chek whether the compiler crashes; the actual
+// diagnostics are uninteresting.
+// CHECK: 8 errors generated.
+template<class _CharT>     struct char_traits;
+template<typename _CharT, typename _Traits = char_traits<_CharT> >     class basic_ios;
+template<typename _CharT, typename _Traits = char_traits<_CharT> >     class ostreambuf_iterator;
+template<typename _CharT, typename _InIter = istreambuf_iterator<_CharT> >     class num_get;
+template<typename _CharT, typename _Traits>     class basic_ostream : virtual public basic_ios<_CharT, _Traits>     {
+  template<typename _CharT, typename _InIter>     _InIter     num_get<_CharT, _InIter>::     _M_extract_float(_InIter __beg, _InIter __end, ios_base& __io,        ios_base::iostate& __err, string& __xtrc) const     {
+    const bool __plus = __c == __lit[__num_base::_S_iplus];
+    if ((__plus || __c == __lit[__num_base::_S_iminus])        && !(__lc->_M_use_grouping && __c == __lc->_M_thousands_sep)        && !(__c == __lc->_M_decimal_point))      {
-- 
2.40.0