Explicitly handle CXXExprWithTemporaries during CFG construction by just visiting the subexpression. While we don't do anything intelligent right now, this obviates a bogus -Wunreahable-code warning reported in PR 6130.

llvm-svn: 112334

clang/lib/Analysis/CFG.cpp

@@ -390,6 +390,12 @@ tryAgain:
     case Stmt::CXXCatchStmtClass:
       return VisitCXXCatchStmt(cast<CXXCatchStmt>(S));
 
+    case Stmt::CXXExprWithTemporariesClass: {
+      // FIXME: Handle temporaries.  For now, just visit the subexpression
+      // so we don't artificially create extra blocks.
+      return Visit(cast<CXXExprWithTemporaries>(S)->getSubExpr());    
+    }
+
     case Stmt::CXXMemberCallExprClass:
       return VisitCXXMemberCallExpr(cast<CXXMemberCallExpr>(S), asc);
 

clang/test/SemaCXX/unreachable-code.cpp

@@ -39,3 +39,20 @@ void test3() {
     bar();     // expected-warning {{will never be executed}}
   }
 }
+
+// PR 6130 - Don't warn about bogus unreachable code with throw's and
+// temporary objects.
+class PR6130 {
+public:
+  PR6130();
+  ~PR6130();
+};
+
+int pr6130(unsigned i) {
+  switch(i) {
+    case 0: return 1;
+    case 1: return 2;
+    default:
+      throw PR6130(); // no-warning
+  }
+}