For -Wconsumed, walk the namespaces to find if the top most namespace is "std"

to determine if a move function is the std::move function.  This allows functions
like std::__1::move to also be treated a the move function.

llvm-svn: 197445

2 files changed, 21 insertions, 2 deletions

diff --git a/clang/lib/Analysis/Consumed.cpp b/clang/lib/Analysis/Consumed.cpp
index 5e1448d0bf3..e5ec3e6b927 100644
--- a/clang/lib/Analysis/Consumed.cpp
+++ b/clang/lib/Analysis/Consumed.cpp
@@ -605,14 +605,25 @@ void ConsumedStmtVisitor::VisitBinaryOperator(const BinaryOperator *BinOp) {
   }
 }
 
+static bool isStdNamespace(const DeclContext *DC) {
+  if (!DC->isNamespace()) return false;
+  while (DC->getParent()->isNamespace())
+    DC = DC->getParent();
+  const NamespaceDecl *ND = dyn_cast<NamespaceDecl>(DC);
+
+  return ND && ND->getName() == "std" &&
+         ND->getDeclContext()->isTranslationUnit();
+}
+
 void ConsumedStmtVisitor::VisitCallExpr(const CallExpr *Call) {
   if (const FunctionDecl *FunDecl =
     dyn_cast_or_null<FunctionDecl>(Call->getDirectCallee())) {
     
     // Special case for the std::move function.
     // TODO: Make this more specific. (Deferred)
-    if (FunDecl->getQualifiedNameAsString() == "std::move" &&
-        Call->getNumArgs() == 1) {
+    if (Call->getNumArgs() == 1 &&
+        FunDecl->getNameAsString() == "move" &&
+        isStdNamespace(FunDecl->getDeclContext())) {
       forwardInfo(Call->getArg(0), Call);
       return;
     }
diff --git a/clang/test/SemaCXX/warn-consumed-analysis.cpp b/clang/test/SemaCXX/warn-consumed-analysis.cpp
index 5297981ade1..2c372c752ba 100644
--- a/clang/test/SemaCXX/warn-consumed-analysis.cpp
+++ b/clang/test/SemaCXX/warn-consumed-analysis.cpp
@@ -798,6 +798,12 @@ namespace std {
   void move();
   template<class T>
   void move(T&&);
+
+  namespace __1 {
+    void move();
+    template<class T>
+    void move(T&&);
+  }
 }
 
 namespace PR18260 {
@@ -810,5 +816,7 @@ namespace PR18260 {
     x.move();
     std::move();
     std::move(x);
+    std::__1::move();
+    std::__1::move(x);
   }
 } // end namespace PR18260