9816863dd4
Constructing `std::span` objects with the two parameter constructors could introduce mismatched bounds information, which defeats the purpose of using `std::span`. Therefore, we warn every use of such constructors. rdar://115817781
157 lines
11 KiB
C++
157 lines
11 KiB
C++
// RUN: %clang_cc1 -std=c++20 -Wno-all -Wunsafe-buffer-usage-in-container -verify %s
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namespace std {
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template <class T> class span {
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public:
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constexpr span(T *, unsigned){}
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template<class Begin, class End>
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constexpr span(Begin first, End last){}
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T * data();
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constexpr span() {};
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constexpr span(const std::span<T> &span) {};
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template<class R>
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constexpr span(R && range){};
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};
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template< class T >
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T&& move( T&& t ) noexcept;
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}
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namespace irrelevant_constructors {
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void non_two_param_constructors() {
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class Array {
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} a;
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std::span<int> S; // no warn
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std::span<int> S1{}; // no warn
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std::span<int> S2{std::move(a)}; // no warn
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std::span<int> S3{S2}; // no warn
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}
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} // irrelevant_constructors
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namespace construct_wt_ptr_size {
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std::span<int> warnVarInit(int *p) {
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std::span<int> S{p, 10}; // expected-warning{{the two-parameter std::span construction is unsafe as it can introduce mismatch between buffer size and the bound information}}
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std::span<int> S1(p, 10); // expected-warning{{the two-parameter std::span construction is unsafe as it can introduce mismatch between buffer size and the bound information}}
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std::span<int> S2 = std::span{p, 10}; // expected-warning{{the two-parameter std::span construction is unsafe as it can introduce mismatch between buffer size and the bound information}}
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std::span<int> S3 = std::span(p, 10); // expected-warning{{the two-parameter std::span construction is unsafe as it can introduce mismatch between buffer size and the bound information}}
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std::span<int> S4 = std::span<int>{p, 10}; // expected-warning{{the two-parameter std::span construction is unsafe as it can introduce mismatch between buffer size and the bound information}}
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std::span<int> S5 = std::span<int>(p, 10); // expected-warning{{the two-parameter std::span construction is unsafe as it can introduce mismatch between buffer size and the bound information}}
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std::span<int> S6 = {p, 10}; // expected-warning{{the two-parameter std::span construction is unsafe as it can introduce mismatch between buffer size and the bound information}}
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auto S7 = std::span<int>{p, 10}; // expected-warning{{the two-parameter std::span construction is unsafe as it can introduce mismatch between buffer size and the bound information}}
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auto S8 = std::span<int>(p, 10); // expected-warning{{the two-parameter std::span construction is unsafe as it can introduce mismatch between buffer size and the bound information}}
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const auto &S9 = std::span<int>{p, 10}; // expected-warning{{the two-parameter std::span construction is unsafe as it can introduce mismatch between buffer size and the bound information}}
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auto &&S10 = std::span<int>(p, 10); // expected-warning{{the two-parameter std::span construction is unsafe as it can introduce mismatch between buffer size and the bound information}}
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#define Ten 10
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std::span S11 = std::span<int>{p, Ten}; // expected-warning{{the two-parameter std::span construction is unsafe as it can introduce mismatch between buffer size and the bound information}}
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if (auto X = std::span<int>{p, Ten}; S10.data()) { // expected-warning{{the two-parameter std::span construction is unsafe as it can introduce mismatch between buffer size and the bound information}}
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}
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auto X = warnVarInit(p); // function return is fine
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return S;
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}
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template<typename T>
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void foo(const T &, const T &&, T);
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std::span<int> warnTemp(int *p) {
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foo(std::span<int>{p, 10}, // expected-warning{{the two-parameter std::span construction is unsafe as it can introduce mismatch between buffer size and the bound information}}
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std::move(std::span<int>{p, 10}), // expected-warning{{the two-parameter std::span construction is unsafe as it can introduce mismatch between buffer size and the bound information}}
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std::span<int>{p, 10}); // expected-warning{{the two-parameter std::span construction is unsafe as it can introduce mismatch between buffer size and the bound information}}
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std::span<int> Arr[1] = {std::span<int>{p, 10}}; // expected-warning{{the two-parameter std::span construction is unsafe as it can introduce mismatch between buffer size and the bound information}}
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if (std::span<int>{p, 10}.data()) { // expected-warning{{the two-parameter std::span construction is unsafe as it can introduce mismatch between buffer size and the bound information}}
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}
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return std::span<int>{p, 10}; // expected-warning{{the two-parameter std::span construction is unsafe as it can introduce mismatch between buffer size and the bound information}}
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}
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void notWarnSafeCases(unsigned n, int *p) {
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int X;
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unsigned Y = 10;
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std::span<int> S = std::span{&X, 1}; // no-warning
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int Arr[10];
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S = std::span{&X, 2}; // expected-warning{{the two-parameter std::span construction is unsafe as it can introduce mismatch between buffer size and the bound information}}
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S = std::span{new int[10], 10}; // no-warning
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S = std::span{new int[n], n}; // no-warning
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S = std::span{new int, 1}; // no-warning
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S = std::span{new int, X}; // expected-warning{{the two-parameter std::span construction is unsafe as it can introduce mismatch between buffer size and the bound information}}
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S = std::span{new int[n--], n--}; // expected-warning{{the two-parameter std::span construction is unsafe as it can introduce mismatch between buffer size and the bound information}}
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S = std::span{new int[10], 11}; // expected-warning{{the two-parameter std::span construction is unsafe as it can introduce mismatch between buffer size and the bound information}}
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S = std::span{new int[10], 9}; // expected-warning{{the two-parameter std::span construction is unsafe as it can introduce mismatch between buffer size and the bound information}} // not smart enough to tell its safe
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S = std::span{new int[10], Y}; // expected-warning{{the two-parameter std::span construction is unsafe as it can introduce mismatch between buffer size and the bound information}} // not smart enough to tell its safe
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S = std::span{Arr, 10}; // no-warning
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S = std::span{Arr, Y}; // expected-warning{{the two-parameter std::span construction is unsafe as it can introduce mismatch between buffer size and the bound information}} // not smart enough to tell its safe
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S = std::span{p, 0}; // no-warning
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}
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} // namespace construct_wt_ptr_size
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namespace construct_wt_begin_end {
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class It {};
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std::span<int> warnVarInit(It &First, It &Last) {
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std::span<int> S{First, Last}; // expected-warning{{the two-parameter std::span construction is unsafe as it can introduce mismatch between buffer size and the bound information}}
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std::span<int> S1(First, Last); // expected-warning{{the two-parameter std::span construction is unsafe as it can introduce mismatch between buffer size and the bound information}}
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std::span<int> S2 = std::span<int>{First, Last}; // expected-warning{{the two-parameter std::span construction is unsafe as it can introduce mismatch between buffer size and the bound information}}
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std::span<int> S3 = std::span<int>(First, Last); // expected-warning{{the two-parameter std::span construction is unsafe as it can introduce mismatch between buffer size and the bound information}}
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std::span<int> S4 = std::span<int>{First, Last}; // expected-warning{{the two-parameter std::span construction is unsafe as it can introduce mismatch between buffer size and the bound information}}
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std::span<int> S5 = std::span<int>(First, Last); // expected-warning{{the two-parameter std::span construction is unsafe as it can introduce mismatch between buffer size and the bound information}}
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std::span<int> S6 = {First, Last}; // expected-warning{{the two-parameter std::span construction is unsafe as it can introduce mismatch between buffer size and the bound information}}
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auto S7 = std::span<int>{First, Last}; // expected-warning{{the two-parameter std::span construction is unsafe as it can introduce mismatch between buffer size and the bound information}}
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auto S8 = std::span<int>(First, Last); // expected-warning{{the two-parameter std::span construction is unsafe as it can introduce mismatch between buffer size and the bound information}}
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const auto &S9 = std::span<int>{First, Last}; // expected-warning{{the two-parameter std::span construction is unsafe as it can introduce mismatch between buffer size and the bound information}}
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auto &&S10 = std::span<int>(First, Last); // expected-warning{{the two-parameter std::span construction is unsafe as it can introduce mismatch between buffer size and the bound information}}
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if (auto X = std::span<int>{First, Last}; S10.data()) { // expected-warning{{the two-parameter std::span construction is unsafe as it can introduce mismatch between buffer size and the bound information}}
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}
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auto X = warnVarInit(First, Last); // function return is fine
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return S;
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}
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template<typename T>
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void foo(const T &, const T &&, T);
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std::span<int> warnTemp(It &First, It &Last) {
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foo(std::span<int>{First, Last}, // expected-warning{{the two-parameter std::span construction is unsafe as it can introduce mismatch between buffer size and the bound information}}
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std::move(std::span<int>{First, Last}), // expected-warning{{the two-parameter std::span construction is unsafe as it can introduce mismatch between buffer size and the bound information}}
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std::span<int>{First, Last}); // expected-warning{{the two-parameter std::span construction is unsafe as it can introduce mismatch between buffer size and the bound information}}
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std::span<int> Arr[1] = {std::span<int>{First, Last}}; // expected-warning{{the two-parameter std::span construction is unsafe as it can introduce mismatch between buffer size and the bound information}}
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if (std::span<int>{First, Last}.data()) { // expected-warning{{the two-parameter std::span construction is unsafe as it can introduce mismatch between buffer size and the bound information}}
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}
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return std::span<int>{First, Last}; // expected-warning{{the two-parameter std::span construction is unsafe as it can introduce mismatch between buffer size and the bound information}}
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}
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} // namespace construct_wt_begin_end
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namespace test_flag {
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void f(int *p) {
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#pragma clang diagnostic push
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#pragma clang diagnostic ignored "-Wunsafe-buffer-usage" // this flag turns off every unsafe-buffer warning
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std::span<int> S{p, 10}; // no-warning
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p++; // no-warning
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#pragma clang diagnostic pop
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#pragma clang diagnostic push
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#pragma clang diagnostic warning "-Wunsafe-buffer-usage"
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#pragma clang diagnostic ignored "-Wunsafe-buffer-usage-in-container"
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// turn on all unsafe-buffer warnings except for the ones under `-Wunsafe-buffer-usage-in-container`
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std::span<int> S2{p, 10}; // no-warning
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p++; // expected-warning{{unsafe pointer arithmetic}}\
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expected-note{{pass -fsafe-buffer-usage-suggestions to receive code hardening suggestions}}
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#pragma clang diagnostic pop
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}
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} //namespace test_flag
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