[clang-tidy] Fix another crash in make-unique check.

Summary:
The crash happens when calling `reset` method without any preceding
operation like "->" or ".", this could happen in a subclass of the
"std::unique_ptr".

Reviewers: alexfh

Reviewed By: alexfh

Subscribers: JDevlieghere, xazax.hun, cfe-commits

Differential Revision: https://reviews.llvm.org/D36452

llvm-svn: 310496

clang-tools-extra/clang-tidy/modernize/MakeSmartPtrCheck.cpp

@@ -199,6 +199,13 @@ void MakeSmartPtrCheck::checkReset(SourceManager &SM,
     return;
   }
 
+  // There are some cases where we don't have operator ("." or "->") of the
+  // "reset" expression, e.g. call "reset()" method directly in the subclass of
+  // "std::unique_ptr<>". We skip these cases.
+  if (OperatorLoc.isInvalid()) {
+    return;
+  }
+
   auto Diag = diag(ResetCallStart, "use %0 instead")
               << MakeSmartPtrFunctionName;
 

clang-tools-extra/test/clang-tidy/modernize-make-unique.cpp

@@ -415,3 +415,16 @@ void macro() {
   g2<bar::Bar>(t);
 }
 #undef DEFINE
+
+class UniqueFoo : public std::unique_ptr<Foo> {
+ public:
+  void foo() {
+    reset(new Foo);
+    this->reset(new Foo);
+    // CHECK-MESSAGES: :[[@LINE-1]]:11: warning: use std::make_unique instead
+    // CHECK-FIXES: *this = std::make_unique<Foo>();
+    (*this).reset(new Foo);
+    // CHECK-MESSAGES: :[[@LINE-1]]:13: warning: use std::make_unique instead
+    // CHECK-FIXES: (*this) = std::make_unique<Foo>();
+  }
+};