[code-completion] Fix crash when trying to do postfix completion of instance...

[code-completion] Fix crash when trying to do postfix completion of instance member inside a static function.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@292052 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Parse/ParseExpr.cpp

@@ -1652,9 +1652,10 @@ Parser::ParsePostfixExpressionSuffix(ExprResult LHS) {
 
       if (Tok.is(tok::code_completion)) {
         // Code completion for a member access expression.
-        Actions.CodeCompleteMemberReferenceExpr(
-            getCurScope(), LHS.get(), OpLoc, OpKind == tok::arrow,
-            ExprStatementTokLoc == LHS.get()->getLocStart());
+        if (Expr *Base = LHS.get())
+          Actions.CodeCompleteMemberReferenceExpr(
+              getCurScope(), Base, OpLoc, OpKind == tok::arrow,
+              ExprStatementTokLoc == Base->getLocStart());
 
         cutOffParsing();
         return ExprError();

test/CodeCompletion/member-access.cpp

@@ -27,6 +27,16 @@ public:
 
 void test(const Proxy &p) {
   p->
+}
+
+struct Test1 {
+  Base1 b;
+
+  static void sfunc() {
+    b. // expected-error {{invalid use of member 'b' in static member function}}
+  }
+};
+
   // RUN: %clang_cc1 -fsyntax-only -code-completion-at=%s:29:6 %s -o - | FileCheck -check-prefix=CHECK-CC1 %s
   // CHECK-CC1: Base1 : Base1::
   // CHECK-CC1: member1 : [#int#][#Base1::#]member1
@@ -39,4 +49,6 @@ void test(const Proxy &p) {
   // CHECK-CC1: memfun1 (Hidden) : [#void#]Base2::memfun1(<#int#>)
   // CHECK-CC1: memfun2 : [#void#][#Base3::#]memfun2(<#int#>)
   // CHECK-CC1: memfun3 : [#int#]memfun3(<#int#>)
-  
+
+// Make sure this doesn't crash
+// RUN: %clang_cc1 -fsyntax-only -code-completion-at=%s:36:7 %s -verify