[clang-tidy] Fix make-unique check to work in C++17 mode.

Summary:
Previously, we intended to omit the check fix to the case when constructor has
any braced-init-list argument. But the HasListInitializedArgument was not
correct to handle all cases (Foo(Bar{1, 2}) will return false in C++14
mode).

This patch fixes it, corrects the tests, and makes the check to run at C++17 mode.

Reviewers: gribozavr

Subscribers: xazax.hun, cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D62736

llvm-svn: 362361

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

@@ -298,11 +298,20 @@ bool MakeSmartPtrCheck::replaceNew(DiagnosticBuilder &Diag,
         return true;
       // Check whether we implicitly construct a class from a
       // std::initializer_list.
-      if (const auto *ImplicitCE = dyn_cast<CXXConstructExpr>(Arg)) {
-        if (ImplicitCE->isStdInitListInitialization())
+      if (const auto *CEArg = dyn_cast<CXXConstructExpr>(Arg)) {
+        // Strip the elidable move constructor, it is present in the AST for
+        // C++11/14, e.g. Foo(Bar{1, 2}), the move constructor is around the
+        // init-list constructor.
+        if (CEArg->isElidable()) {
+          if (const auto *TempExp = CEArg->getArg(0)) {
+            if (const auto *UnwrappedCE =
+                    dyn_cast<CXXConstructExpr>(TempExp->IgnoreImplicit()))
+              CEArg = UnwrappedCE;
+          }
+        }
+        if (CEArg->isStdInitListInitialization())
           return true;
       }
-      return false;
     }
     return false;
   };

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

@@ -1,5 +1,5 @@
-// RUN: %check_clang_tidy -std=c++14 %s modernize-make-unique %t -- -- -I %S/Inputs/modernize-smart-ptr
-// FIXME: Fix the checker to work in C++17 mode.
+// RUN: %check_clang_tidy -std=c++14,c++17 %s modernize-make-unique %t -- -- -I %S/Inputs/modernize-smart-ptr
+// FIXME: Fix the test code in C++2a mode.
 
 #include "unique_ptr.h"
 #include "initializer_list.h"
@@ -455,10 +455,10 @@ void initialization(int T, Base b) {
 
   std::unique_ptr<J> PJ2 = std::unique_ptr<J>(new J(E{1, 2}, 1));
   // CHECK-MESSAGES: :[[@LINE-1]]:28: warning: use std::make_unique instead
-  // CHECK-FIXES: std::unique_ptr<J> PJ2 = std::make_unique<J>(E{1, 2}, 1);
+  // CHECK-FIXES: std::unique_ptr<J> PJ2 = std::unique_ptr<J>(new J(E{1, 2}, 1));
   PJ2.reset(new J(E{1, 2}, 1));
   // CHECK-MESSAGES: :[[@LINE-1]]:7: warning: use std::make_unique instead
-  // CHECK-FIXES: PJ2 = std::make_unique<J>(E{1, 2}, 1);
+  // CHECK-FIXES: PJ2.reset(new J(E{1, 2}, 1));
 
   std::unique_ptr<J> PJ3 = std::unique_ptr<J>(new J{ {1, 2}, 1 });
   // CHECK-MESSAGES: :[[@LINE-1]]:28: warning: use std::make_unique instead
@@ -469,10 +469,10 @@ void initialization(int T, Base b) {
 
   std::unique_ptr<J> PJ4 = std::unique_ptr<J>(new J{E{1, 2}, 1});
   // CHECK-MESSAGES: :[[@LINE-1]]:28: warning: use std::make_unique instead
-  // CHECK-FIXES: std::unique_ptr<J> PJ4 = std::make_unique<J>(E{1, 2}, 1);
+  // CHECK-FIXES: std::unique_ptr<J> PJ4 = std::unique_ptr<J>(new J{E{1, 2}, 1});
   PJ4.reset(new J{E{1, 2}, 1});
   // CHECK-MESSAGES: :[[@LINE-1]]:7: warning: use std::make_unique instead
-  // CHECK-FIXES:  PJ4 = std::make_unique<J>(E{1, 2}, 1);
+  // CHECK-FIXES: PJ4.reset(new J{E{1, 2}, 1});
 
   std::unique_ptr<Foo> FF = std::unique_ptr<Foo>(new Foo());
   // CHECK-MESSAGES: :[[@LINE-1]]:29: warning: