[Objective-c] Fix a crash in WeakObjectProfileTy::getBaseInfo.

The crash occurs in WeakObjectProfileTy::getBaseInfo when getBase() is
called on an ObjCPropertyRefExpr object whose receiver is an interface.
This commit fixes the crash by checking the type of the receiver and
setting IsExact to true if it is an interface.

rdar://problem/25208167

Differential Revision: http://reviews.llvm.org/D18268

llvm-svn: 263818

1 files changed, 9 insertions, 5 deletions

diff --git a/clang/lib/Sema/ScopeInfo.cpp b/clang/lib/Sema/ScopeInfo.cpp
index ef9eed65ebc..d18328878c7 100644
--- a/clang/lib/Sema/ScopeInfo.cpp
+++ b/clang/lib/Sema/ScopeInfo.cpp
@@ -86,11 +86,15 @@ FunctionScopeInfo::WeakObjectProfileTy::getBaseInfo(const Expr *E) {
     if (BaseProp) {
       D = getBestPropertyDecl(BaseProp);
 
-      const Expr *DoubleBase = BaseProp->getBase();
-      if (const OpaqueValueExpr *OVE = dyn_cast<OpaqueValueExpr>(DoubleBase))
-        DoubleBase = OVE->getSourceExpr();
-
-      IsExact = DoubleBase->isObjCSelfExpr();
+      if (BaseProp->isClassReceiver())
+        IsExact = true;
+      else {
+        const Expr *DoubleBase = BaseProp->getBase();
+        if (const OpaqueValueExpr *OVE = dyn_cast<OpaqueValueExpr>(DoubleBase))
+          DoubleBase = OVE->getSourceExpr();
+
+        IsExact = DoubleBase->isObjCSelfExpr();
+      }
     }
     break;
   }