Make sure to copy back arguments that can be changed by FindAllocationOverload. This fixes placement new. (Sebastian, please review).

llvm-svn: 72673

clang/lib/Sema/SemaExprCXX.cpp

@@ -508,6 +508,11 @@ bool Sema::FindAllocationFunctions(SourceLocation StartLoc, SourceRange Range,
       return true;
   }
 
+  // FindAllocationOverload can change the passed in arguments, so we need to
+  // copy them back.
+  if (NumPlaceArgs > 0)
+    std::copy(&AllocArgs[1], AllocArgs.end(), PlaceArgs);
+  
   // FIXME: This is leaked on error. But so much is currently in Sema that it's
   // easier to clean it in one go.
   AllocArgs[0]->Destroy(Context);

clang/test/CodeGenCXX/new.cpp

@@ -3,3 +3,10 @@
 void t1() {
   int* a = new int;
 }
+
+// Placement.
+void* operator new(unsigned long, void*) throw();
+
+void t2(int* a) {
+  int* b = new (a) int;
+}