r218715 - Update -Wuninitialized to be stricter on CK_NoOp casts.

[Richard Trieu]

Author: rtrieu
Date: Tue Sep 30 18:04:37 2014
New Revision: 218715

URL: http://llvm.org/viewvc/llvm-project?rev=218715&view=rev
Log:
Update -Wuninitialized to be stricter on CK_NoOp casts.

Modified:
    cfe/trunk/lib/Sema/SemaDecl.cpp
    cfe/trunk/test/SemaCXX/uninitialized.cpp

Modified: cfe/trunk/lib/Sema/SemaDecl.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Sema/SemaDecl.cpp?rev=218715&r1=218714&r2=218715&view=diff
==============================================================================
--- cfe/trunk/lib/Sema/SemaDecl.cpp (original)
+++ cfe/trunk/lib/Sema/SemaDecl.cpp Tue Sep 30 18:04:37 2014
@@ -8404,8 +8404,7 @@ namespace {
     }
 
     void VisitImplicitCastExpr(ImplicitCastExpr *E) {
-      if (E->getCastKind() == CK_LValueToRValue ||
-          (isRecordType && E->getCastKind() == CK_NoOp)) {
+      if (E->getCastKind() == CK_LValueToRValue) {
         HandleValue(E->getSubExpr());
         return;
       }
@@ -8473,9 +8472,15 @@ namespace {
 
     void VisitCXXConstructExpr(CXXConstructExpr *E) {
       if (E->getConstructor()->isCopyConstructor()) {
-        if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E->getArg(0))) {
-          HandleDeclRefExpr(DRE);
-        }
+        Expr *ArgExpr = E->getArg(0);
+        if (InitListExpr *ILE = dyn_cast<InitListExpr>(ArgExpr))
+          if (ILE->getNumInits() == 1)
+            ArgExpr = ILE->getInit(0);
+        if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(ArgExpr))
+          if (ICE->getCastKind() == CK_NoOp)
+            ArgExpr = ICE->getSubExpr();
+        HandleValue(ArgExpr);
+        return;
       }
       Inherited::VisitCXXConstructExpr(E);
     }

Modified: cfe/trunk/test/SemaCXX/uninitialized.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/SemaCXX/uninitialized.cpp?rev=218715&r1=218714&r2=218715&view=diff
==============================================================================
--- cfe/trunk/test/SemaCXX/uninitialized.cpp (original)
+++ cfe/trunk/test/SemaCXX/uninitialized.cpp Tue Sep 30 18:04:37 2014
@@ -150,6 +150,7 @@ A getA(int x) { return A(); }
 A getA(A* a) { return A(); }
 A getA(A a) { return A(); }
 A moveA(A&& a) { return A(); }
+A const_refA(const A& a) { return A(); }
 
 void setupA(bool x) {
   A a1;
@@ -195,6 +196,13 @@ void setupA(bool x) {
   A a33 = A(std::move(a33));   // expected-warning {{variable 'a33' is uninitialized when used within its own initialization}}
   A a34(std::move(a34));   // expected-warning {{variable 'a34' is uninitialized when used within its own initialization}}
   A a35 = std::move(x ? a34 : (37, a35));  // expected-warning {{variable 'a35' is uninitialized when used within its own initialization}}
+
+  A a36 = const_refA(a36);
+  A a37(const_refA(a37));
+
+  A a38({a38});  // expected-warning {{variable 'a38' is uninitialized when used within its own initialization}}
+  A a39 = {a39};  // expected-warning {{variable 'a39' is uninitialized when used within its own initialization}}
+  A a40 = A({a40});  // expected-warning {{variable 'a40' is uninitialized when used within its own initialization}}
 }
 
 bool cond;
@@ -239,6 +247,14 @@ A a32 = moveA(std::move(a32));  // expec
 A a33 = A(std::move(a33));   // expected-warning {{variable 'a33' is uninitialized when used within its own initialization}}
 A a34(std::move(a34));   // expected-warning {{variable 'a34' is uninitialized when used within its own initialization}}
 A a35 = std::move(x ? a34 : (37, a35));  // expected-warning {{variable 'a35' is uninitialized when used within its own initialization}}
+
+A a36 = const_refA(a36);
+A a37(const_refA(a37));
+
+A a38({a38});  // expected-warning {{variable 'a38' is uninitialized when used within its own initialization}}
+A a39 = {a39};  // expected-warning {{variable 'a39' is uninitialized when used within its own initialization}}
+A a40 = A({a40});  // expected-warning {{variable 'a40' is uninitialized when used within its own initialization}}
+
 struct B {
   // POD struct.
   int x;