From: Fariborz Jahanian <fjahanian@apple.com>
Date: Mon, 15 Sep 2014 21:19:39 +0000 (+0000)
Subject: Objective-C. Prevents a crash generating AST for a
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=bc357ac9dba1b08589867405dacb0ca2ebd2f736;p=clang

Objective-C. Prevents a crash generating AST for a
a property assignment due to numerous user errors.
Cannot come up with a reasonable test case due to
array of user errors before the crash point.
rdar://17813651.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@217825 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Sema/SemaPseudoObject.cpp b/lib/Sema/SemaPseudoObject.cpp
index 7bfe333749..5e92d5d07c 100644
--- a/lib/Sema/SemaPseudoObject.cpp
+++ b/lib/Sema/SemaPseudoObject.cpp
@@ -406,6 +406,10 @@ PseudoOpBuilder::buildAssignmentOperation(Scope *Sc, SourceLocation opcLoc,
                                           BinaryOperatorKind opcode,
                                           Expr *LHS, Expr *RHS) {
   assert(BinaryOperator::isAssignmentOp(opcode));
+  
+  // Recover from user error
+  if (isa<UnresolvedLookupExpr>(RHS))
+    return ExprError();
 
   Expr *syntacticLHS = rebuildAndCaptureObject(LHS);
   OpaqueValueExpr *capturedRHS = capture(RHS);