[clang-tidy] Fix check for trivially copyable types in modernize-pass-by-value

Summary:
rL270567 excluded trivially copyable types from being moved by
modernize-pass-by-value, but it didn't exclude references to them.
Change types used in the tests to not be trivially copyable.

Reviewers: madsravn, aaron.ballman, alexfh

Subscribers: JDevlieghere, cfe-commits

Differential Revision: https://reviews.llvm.org/D28614

llvm-svn: 291796

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

@@ -188,7 +188,8 @@ void PassByValueCheck::check(const MatchFinder::MatchResult &Result) {
 
   // If the parameter is trivial to copy, don't move it. Moving a trivivally
   // copyable type will cause a problem with misc-move-const-arg
-  if (ParamDecl->getType().isTriviallyCopyableType(*Result.Context))
+  if (ParamDecl->getType().getNonReferenceType().isTriviallyCopyableType(
+          *Result.Context))
     return;
 
   auto Diag = diag(ParamDecl->getLocStart(), "pass by value and use std::move");

clang-tools-extra/test/clang-tidy/Inputs/modernize-pass-by-value/header.h

@@ -1,4 +1,7 @@
 class ThreadId {
+public:
+  ThreadId(const ThreadId &) {}
+  ThreadId(ThreadId &&) {}
 };
 
 struct A {

clang-tools-extra/test/clang-tidy/modernize-pass-by-value-header.cpp

@@ -3,6 +3,6 @@
 // RUN: FileCheck -input-file=%T/pass-by-value-header.h %s -check-prefix=CHECK-FIXES
 
 #include "pass-by-value-header.h"
-// CHECK-MESSAGES: :5:5: warning: pass by value and use std::move [modernize-pass-by-value]
+// CHECK-MESSAGES: :8:5: warning: pass by value and use std::move [modernize-pass-by-value]
 // CHECK-FIXES: #include <utility>
 // CHECK-FIXES: A(ThreadId tid) : threadid(std::move(tid)) {}

clang-tools-extra/test/clang-tidy/modernize-pass-by-value-macro-header.cpp

@@ -6,6 +6,8 @@
 #include HEADER
 
 struct A {
+  A(const A &) {}
+  A(A &&) {}
 };
 
 struct B {

clang-tools-extra/test/clang-tidy/modernize-pass-by-value.cpp

@@ -2,8 +2,15 @@
 
 namespace {
 // POD types are trivially move constructible.
+struct POD {
+  int a, b, c;
+};
+
 struct Movable {
   int a, b, c;
+  Movable() = default;
+  Movable(const Movable &) {}
+  Movable(Movable &&) {}
 };
 
 struct NotMovable {
@@ -147,7 +154,8 @@ template <typename T> struct N {
 // Test with value parameter.
 struct O {
   O(Movable M) : M(M) {}
-  // CHECK-FIXES: O(Movable M) : M(M) {}
+  // CHECK-MESSAGES: :[[@LINE-1]]:5: warning: pass by value and use std::move
+  // CHECK-FIXES: O(Movable M) : M(std::move(M)) {}
   Movable M;
 };
 
@@ -179,7 +187,8 @@ typedef ::Movable RMovable;
 }
 struct R {
   R(ns_R::RMovable M) : M(M) {}
-  // CHECK-FIXES: R(ns_R::RMovable M) : M(M) {}
+  // CHECK-MESSAGES: :[[@LINE-1]]:5: warning: pass by value and use std::move
+  // CHECK-FIXES: R(ns_R::RMovable M) : M(std::move(M)) {}
   ns_R::RMovable M;
 };
 
@@ -199,3 +208,8 @@ struct T {
   // CHECK-FIXES: T(array<int, 10> a) : a_(a) {}
   array<int, 10> a_;
 };
+
+struct U {
+  U(const POD &M) : M(M) {}
+  POD M;
+};