forked from OSchip/llvm-project
608 lines
16 KiB
C++
608 lines
16 KiB
C++
// RUN: %check_clang_tidy %s modernize-use-emplace %t -- \
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// RUN: -config="{CheckOptions: \
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// RUN: [{key: modernize-use-emplace.ContainersWithPushBack, \
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// RUN: value: '::std::vector; ::std::list; ::std::deque; llvm::LikeASmallVector'}, \
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// RUN: {key: modernize-use-emplace.TupleTypes, \
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// RUN: value: '::std::pair; std::tuple; ::test::Single'}, \
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// RUN: {key: modernize-use-emplace.TupleMakeFunctions, \
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// RUN: value: '::std::make_pair; ::std::make_tuple; ::test::MakeSingle'}] \
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// RUN: }" -- -std=c++11
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namespace std {
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template <typename>
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class initializer_list
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{
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public:
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initializer_list() noexcept {}
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};
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template <typename T>
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class vector {
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public:
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vector() = default;
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vector(initializer_list<T>) {}
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void push_back(const T &) {}
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void push_back(T &&) {}
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template <typename... Args>
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void emplace_back(Args &&... args){};
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~vector();
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};
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template <typename T>
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class list {
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public:
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void push_back(const T &) {}
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void push_back(T &&) {}
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template <typename... Args>
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void emplace_back(Args &&... args){};
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~list();
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};
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template <typename T>
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class deque {
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public:
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void push_back(const T &) {}
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void push_back(T &&) {}
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template <typename... Args>
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void emplace_back(Args &&... args){};
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~deque();
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};
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template <typename T> struct remove_reference { using type = T; };
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template <typename T> struct remove_reference<T &> { using type = T; };
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template <typename T> struct remove_reference<T &&> { using type = T; };
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template <typename T1, typename T2> class pair {
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public:
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pair() = default;
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pair(const pair &) = default;
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pair(pair &&) = default;
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pair(const T1 &, const T2 &) {}
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pair(T1 &&, T2 &&) {}
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template <typename U1, typename U2> pair(const pair<U1, U2> &){};
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template <typename U1, typename U2> pair(pair<U1, U2> &&){};
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};
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template <typename T1, typename T2>
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pair<typename remove_reference<T1>::type, typename remove_reference<T2>::type>
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make_pair(T1 &&, T2 &&) {
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return {};
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};
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template <typename... Ts> class tuple {
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public:
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tuple() = default;
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tuple(const tuple &) = default;
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tuple(tuple &&) = default;
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tuple(const Ts &...) {}
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tuple(Ts &&...) {}
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template <typename... Us> tuple(const tuple<Us...> &){};
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template <typename... Us> tuple(tuple<Us...> &&) {}
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template <typename U1, typename U2> tuple(const pair<U1, U2> &) {
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static_assert(sizeof...(Ts) == 2, "Wrong tuple size");
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};
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template <typename U1, typename U2> tuple(pair<U1, U2> &&) {
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static_assert(sizeof...(Ts) == 2, "Wrong tuple size");
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};
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};
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template <typename... Ts>
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tuple<typename remove_reference<Ts>::type...> make_tuple(Ts &&...) {
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return {};
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}
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template <typename T>
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class unique_ptr {
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public:
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explicit unique_ptr(T *) {}
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~unique_ptr();
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};
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} // namespace std
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namespace llvm {
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template <typename T>
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class LikeASmallVector {
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public:
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void push_back(const T &) {}
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void push_back(T &&) {}
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template <typename... Args>
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void emplace_back(Args &&... args){};
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};
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} // llvm
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void testInts() {
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std::vector<int> v;
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v.push_back(42);
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v.push_back(int(42));
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v.push_back(int{42});
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v.push_back(42.0);
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int z;
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v.push_back(z);
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}
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struct Something {
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Something(int a, int b = 41) {}
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Something() {}
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void push_back(Something);
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int getInt() { return 42; }
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};
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struct Convertable {
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operator Something() { return Something{}; }
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};
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struct Zoz {
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Zoz(Something, int = 42) {}
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};
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Zoz getZoz(Something s) { return Zoz(s); }
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void test_Something() {
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std::vector<Something> v;
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v.push_back(Something(1, 2));
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// CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use emplace_back instead of push_back [modernize-use-emplace]
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// CHECK-FIXES: v.emplace_back(1, 2);
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v.push_back(Something{1, 2});
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// CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use emplace_back
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// CHECK-FIXES: v.emplace_back(1, 2);
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v.push_back(Something());
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// CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use emplace_back
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// CHECK-FIXES: v.emplace_back();
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v.push_back(Something{});
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// CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use emplace_back
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// CHECK-FIXES: v.emplace_back();
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Something Different;
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v.push_back(Something(Different.getInt(), 42));
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// CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use emplace_back
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// CHECK-FIXES: v.emplace_back(Different.getInt(), 42);
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v.push_back(Different.getInt());
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// CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use emplace_back
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// CHECK-FIXES: v.emplace_back(Different.getInt());
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v.push_back(42);
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// CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use emplace_back
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// CHECK-FIXES: v.emplace_back(42);
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Something temporary(42, 42);
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temporary.push_back(temporary);
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v.push_back(temporary);
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v.push_back(Convertable());
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v.push_back(Convertable{});
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Convertable s;
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v.push_back(s);
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}
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template <typename ElemType>
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void dependOnElem() {
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std::vector<ElemType> v;
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v.push_back(ElemType(42));
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}
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template <typename ContainerType>
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void dependOnContainer() {
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ContainerType v;
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v.push_back(Something(42));
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}
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void callDependent() {
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dependOnElem<Something>();
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dependOnContainer<std::vector<Something>>();
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}
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void test2() {
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std::vector<Zoz> v;
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v.push_back(Zoz(Something(21, 37)));
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// CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use emplace_back
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// CHECK-FIXES: v.emplace_back(Something(21, 37));
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v.push_back(Zoz(Something(21, 37), 42));
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// CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use emplace_back
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// CHECK-FIXES: v.emplace_back(Something(21, 37), 42);
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v.push_back(getZoz(Something(1, 2)));
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}
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struct GetPair {
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std::pair<int, long> getPair();
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};
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void testPair() {
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std::vector<std::pair<int, int>> v;
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v.push_back(std::pair<int, int>(1, 2));
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// CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use emplace_back
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// CHECK-FIXES: v.emplace_back(1, 2);
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GetPair g;
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v.push_back(g.getPair());
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// CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use emplace_back
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// CHECK-FIXES: v.emplace_back(g.getPair());
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std::vector<std::pair<Something, Zoz>> v2;
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v2.push_back(std::pair<Something, Zoz>(Something(42, 42), Zoz(Something(21, 37))));
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// CHECK-MESSAGES: :[[@LINE-1]]:6: warning: use emplace_back
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// CHECK-FIXES: v2.emplace_back(Something(42, 42), Zoz(Something(21, 37)));
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}
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void testTuple() {
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std::vector<std::tuple<bool, char, int>> v;
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v.push_back(std::tuple<bool, char, int>(false, 'x', 1));
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// CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use emplace_back
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// CHECK-FIXES: v.emplace_back(false, 'x', 1);
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v.push_back(std::tuple<bool, char, int>{false, 'y', 2});
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// CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use emplace_back
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// CHECK-FIXES: v.emplace_back(false, 'y', 2);
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v.push_back({true, 'z', 3});
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// CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use emplace_back
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// CHECK-FIXES: v.emplace_back(true, 'z', 3);
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std::vector<std::tuple<int, bool>> x;
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x.push_back(std::make_pair(1, false));
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// CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use emplace_back
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// CHECK-FIXES: x.emplace_back(1, false);
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x.push_back(std::make_pair(2LL, 1));
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// CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use emplace_back
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// CHECK-FIXES: x.emplace_back(2LL, 1);
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}
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struct Base {
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Base(int, int *, int = 42);
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};
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struct Derived : Base {
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Derived(int *, Something) : Base(42, nullptr) {}
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};
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void testDerived() {
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std::vector<Base> v;
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v.push_back(Derived(nullptr, Something{}));
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}
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void testNewExpr() {
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std::vector<Derived> v;
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v.push_back(Derived(new int, Something{}));
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}
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void testSpaces() {
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std::vector<Something> v;
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// clang-format off
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v.push_back(Something(1, //arg1
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2 // arg2
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) // Something
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);
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// CHECK-MESSAGES: :[[@LINE-4]]:5: warning: use emplace_back
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// CHECK-FIXES: v.emplace_back(1, //arg1
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// CHECK-FIXES: 2 // arg2
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// CHECK-FIXES: // Something
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// CHECK-FIXES: );
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v.push_back( Something (1, 2) );
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// CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use emplace_back
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// CHECK-FIXES: v.emplace_back(1, 2 );
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v.push_back( Something {1, 2} );
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// CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use emplace_back
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// CHECK-FIXES: v.emplace_back(1, 2 );
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v.push_back( Something {} );
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// CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use emplace_back
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// CHECK-FIXES: v.emplace_back( );
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v.push_back(
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Something(1, 2) );
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// CHECK-MESSAGES: :[[@LINE-2]]:5: warning: use emplace_back
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// CHECK-FIXES: v.emplace_back(1, 2 );
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std::vector<Base> v2;
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v2.push_back(
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Base(42, nullptr));
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// CHECK-MESSAGES: :[[@LINE-2]]:6: warning: use emplace_back
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// CHECK-FIXES: v2.emplace_back(42, nullptr);
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// clang-format on
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}
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void testPointers() {
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std::vector<int *> v;
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v.push_back(new int(5));
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std::vector<std::unique_ptr<int>> v2;
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v2.push_back(std::unique_ptr<int>(new int(42)));
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// This call can't be replaced with emplace_back.
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// If emplacement will fail (not enough memory to add to vector)
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// we will have leak of int because unique_ptr won't be constructed
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// (and destructed) as in push_back case.
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auto *ptr = new int;
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v2.push_back(std::unique_ptr<int>(ptr));
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// Same here
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}
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void testMakePair() {
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std::vector<std::pair<int, int>> v;
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v.push_back(std::make_pair(1, 2));
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// CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use emplace_back
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// CHECK-FIXES: v.emplace_back(1, 2);
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v.push_back(std::make_pair(42LL, 13));
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// CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use emplace_back
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// CHECK-FIXES: v.emplace_back(42LL, 13);
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v.push_back(std::make_pair<char, char>(0, 3));
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// CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use emplace_back
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// CHECK-FIXES: v.emplace_back(std::make_pair<char, char>(0, 3));
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//
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// Even though the call above could be turned into v.emplace_back(0, 3),
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// we don't eliminate the make_pair call here, because of the explicit
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// template parameters provided. make_pair's arguments can be convertible
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// to its explicitly provided template parameter, but not to the pair's
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// element type. The examples below illustrate the problem.
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struct D {
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D(...) {}
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operator char() const { return 0; }
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};
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v.push_back(std::make_pair<D, int>(Something(), 2));
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// CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use emplace_back
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// CHECK-FIXES: v.emplace_back(std::make_pair<D, int>(Something(), 2));
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struct X {
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X(std::pair<int, int>) {}
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};
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std::vector<X> x;
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x.push_back(std::make_pair(1, 2));
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// CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use emplace_back
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// CHECK-FIXES: x.emplace_back(std::make_pair(1, 2));
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// make_pair cannot be removed here, as X is not constructible with two ints.
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struct Y {
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Y(std::pair<int, int>&&) {}
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};
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std::vector<Y> y;
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y.push_back(std::make_pair(2, 3));
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// CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use emplace_back
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// CHECK-FIXES: y.emplace_back(std::make_pair(2, 3));
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// make_pair cannot be removed here, as Y is not constructible with two ints.
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}
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void testMakeTuple() {
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std::vector<std::tuple<int, bool, char>> v;
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v.push_back(std::make_tuple(1, true, 'v'));
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// CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use emplace_back
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// CHECK-FIXES: v.emplace_back(1, true, 'v');
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v.push_back(std::make_tuple(2ULL, 1, 0));
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// CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use emplace_back
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// CHECK-FIXES: v.emplace_back(2ULL, 1, 0);
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v.push_back(std::make_tuple<long long, int, int>(3LL, 1, 0));
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// CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use emplace_back
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// CHECK-FIXES: v.emplace_back(std::make_tuple<long long, int, int>(3LL, 1, 0));
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// make_tuple is not removed when there are explicit template
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// arguments provided.
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}
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namespace test {
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template <typename T> struct Single {
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Single() = default;
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Single(const Single &) = default;
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Single(Single &&) = default;
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Single(const T &) {}
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Single(T &&) {}
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template <typename U> Single(const Single<U> &) {}
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template <typename U> Single(Single<U> &&) {}
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template <typename U> Single(const std::tuple<U> &) {}
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template <typename U> Single(std::tuple<U> &&) {}
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};
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template <typename T>
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Single<typename std::remove_reference<T>::type> MakeSingle(T &&) {
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return {};
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}
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} // namespace test
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void testOtherTuples() {
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std::vector<test::Single<int>> v;
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v.push_back(test::Single<int>(1));
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// CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use emplace_back
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// CHECK-FIXES: v.emplace_back(1);
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v.push_back({2});
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// CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use emplace_back
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// CHECK-FIXES: v.emplace_back(2);
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v.push_back(test::MakeSingle(3));
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// CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use emplace_back
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// CHECK-FIXES: v.emplace_back(3);
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v.push_back(test::MakeSingle<long long>(4));
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// CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use emplace_back
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// CHECK-FIXES: v.emplace_back(test::MakeSingle<long long>(4));
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// We don't remove make functions with explicit template parameters.
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v.push_back(test::MakeSingle(5LL));
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// CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use emplace_back
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// CHECK-FIXES: v.emplace_back(5LL);
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v.push_back(std::make_tuple(6));
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// CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use emplace_back
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// CHECK-FIXES: v.emplace_back(6);
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v.push_back(std::make_tuple(7LL));
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// CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use emplace_back
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// CHECK-FIXES: v.emplace_back(7LL);
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}
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void testOtherContainers() {
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std::list<Something> l;
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l.push_back(Something(42, 41));
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// CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use emplace_back
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// CHECK-FIXES: l.emplace_back(42, 41);
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std::deque<Something> d;
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d.push_back(Something(42));
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// CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use emplace_back
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// CHECK-FIXES: d.emplace_back(42);
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llvm::LikeASmallVector<Something> ls;
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ls.push_back(Something(42));
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// CHECK-MESSAGES: :[[@LINE-1]]:6: warning: use emplace_back
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// CHECK-FIXES: ls.emplace_back(42);
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}
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class IntWrapper {
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public:
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IntWrapper(int x) : value(x) {}
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IntWrapper operator+(const IntWrapper other) const {
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return IntWrapper(value + other.value);
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}
|
|
|
|
private:
|
|
int value;
|
|
};
|
|
|
|
void testMultipleOpsInPushBack() {
|
|
std::vector<IntWrapper> v;
|
|
v.push_back(IntWrapper(42) + IntWrapper(27));
|
|
}
|
|
|
|
// Macro tests.
|
|
#define PUSH_BACK_WHOLE(c, x) c.push_back(x)
|
|
#define PUSH_BACK_NAME push_back
|
|
#define PUSH_BACK_ARG(x) (x)
|
|
#define SOME_OBJ Something(10)
|
|
#define MILLION 3
|
|
#define SOME_WEIRD_PUSH(v) v.push_back(Something(
|
|
#define OPEN (
|
|
#define CLOSE )
|
|
void macroTest() {
|
|
std::vector<Something> v;
|
|
Something s;
|
|
|
|
PUSH_BACK_WHOLE(v, Something(5, 6));
|
|
// CHECK-MESSAGES: :[[@LINE-1]]:3: warning: use emplace_back
|
|
|
|
v.PUSH_BACK_NAME(Something(5));
|
|
// CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use emplace_back
|
|
|
|
v.push_back PUSH_BACK_ARG(Something(5, 6));
|
|
// CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use emplace_back
|
|
|
|
v.push_back(SOME_OBJ);
|
|
// CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use emplace_back
|
|
|
|
v.push_back(Something(MILLION));
|
|
// CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use emplace_back
|
|
// CHECK-FIXES: v.emplace_back(MILLION);
|
|
|
|
// clang-format off
|
|
v.push_back( Something OPEN 3 CLOSE );
|
|
// CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use emplace_back
|
|
// clang-format on
|
|
PUSH_BACK_WHOLE(s, Something(1));
|
|
}
|
|
|
|
struct A {
|
|
int value1, value2;
|
|
};
|
|
|
|
struct B {
|
|
B(A) {}
|
|
};
|
|
|
|
struct C {
|
|
int value1, value2, value3;
|
|
};
|
|
|
|
void testAggregation() {
|
|
// This should not be noticed or fixed; after the correction, the code won't
|
|
// compile.
|
|
|
|
std::vector<A> v;
|
|
v.push_back(A({1, 2}));
|
|
|
|
std::vector<B> vb;
|
|
vb.push_back(B({10, 42}));
|
|
}
|
|
|
|
struct Bitfield {
|
|
unsigned bitfield : 1;
|
|
unsigned notBitfield;
|
|
};
|
|
|
|
void testBitfields() {
|
|
std::vector<Something> v;
|
|
Bitfield b;
|
|
v.push_back(Something(42, b.bitfield));
|
|
v.push_back(Something(b.bitfield));
|
|
|
|
v.push_back(Something(42, b.notBitfield));
|
|
// CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use emplace_back
|
|
// CHECK-FIXES: v.emplace_back(42, b.notBitfield);
|
|
int var;
|
|
v.push_back(Something(42, var));
|
|
// CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use emplace_back
|
|
// CHECK-FIXES: v.emplace_back(42, var);
|
|
}
|
|
|
|
class PrivateCtor {
|
|
PrivateCtor(int z);
|
|
|
|
public:
|
|
void doStuff() {
|
|
std::vector<PrivateCtor> v;
|
|
// This should not change it because emplace back doesn't have permission.
|
|
// Check currently doesn't support friend declarations because pretty much
|
|
// nobody would want to be friend with std::vector :(.
|
|
v.push_back(PrivateCtor(42));
|
|
}
|
|
};
|
|
|
|
struct WithDtor {
|
|
WithDtor(int) {}
|
|
~WithDtor();
|
|
};
|
|
|
|
void testWithDtor() {
|
|
std::vector<WithDtor> v;
|
|
|
|
v.push_back(WithDtor(42));
|
|
// CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use emplace_back
|
|
// CHECK-FIXES: v.emplace_back(42);
|
|
}
|
|
|
|
void testInitializerList() {
|
|
std::vector<std::vector<int>> v;
|
|
v.push_back(std::vector<int>({1}));
|
|
// Test against the bug reported in PR32896.
|
|
|
|
v.push_back({{2}});
|
|
|
|
using PairIntVector = std::pair<int, std::vector<int>>;
|
|
std::vector<PairIntVector> x;
|
|
x.push_back(PairIntVector(3, {4}));
|
|
x.push_back({5, {6}});
|
|
}
|