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// RUN: %clang_cc1 -std=c++20 -Wno-all -Wunsafe-buffer-usage-in-container -verify %s
namespace std {
template <class T> class span {
public:
constexpr span(T *, unsigned){}
template<class Begin, class End>
constexpr span(Begin first, End last){}
T * data();
constexpr span() {};
constexpr span(const std::span<T> &span) {};
template<class R>
constexpr span(R && range){};
};
template< class T >
T&& move( T&& t ) noexcept;
}
namespace irrelevant_constructors {
void non_two_param_constructors() {
class Array {
} a;
std::span<int> S; // no warn
std::span<int> S1{}; // no warn
std::span<int> S2{std::move(a)}; // no warn
std::span<int> S3{S2}; // no warn
}
} // irrelevant_constructors
namespace construct_wt_ptr_size {
std::span<int> warnVarInit(int *p) {
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}}
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}}
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}}
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}}
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}}
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}}
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}}
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}}
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}}
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}}
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}}
#define Ten 10
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}}
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}}
}
auto X = warnVarInit(p); // function return is fine
return S;
}
template<typename T>
void foo(const T &, const T &&, T);
std::span<int> warnTemp(int *p) {
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}}
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}}
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}}
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}}
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}}
}
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}}
}
void notWarnSafeCases(unsigned n, int *p) {
int X;
unsigned Y = 10;
std::span<int> S = std::span{&X, 1}; // no-warning
int Arr[10];
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}}
S = std::span{new int[10], 10}; // no-warning
S = std::span{new int[n], n}; // no-warning
S = std::span{new int, 1}; // no-warning
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}}
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}}
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}}
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
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
S = std::span{Arr, 10}; // no-warning
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
S = std::span{p, 0}; // no-warning
}
} // namespace construct_wt_ptr_size
namespace construct_wt_begin_end {
class It {};
std::span<int> warnVarInit(It &First, It &Last) {
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}}
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}}
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}}
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}}
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}}
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}}
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}}
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}}
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}}
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}}
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}}
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}}
}
auto X = warnVarInit(First, Last); // function return is fine
return S;
}
template<typename T>
void foo(const T &, const T &&, T);
std::span<int> warnTemp(It &First, It &Last) {
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}}
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}}
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}}
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}}
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}}
}
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}}
}
} // namespace construct_wt_begin_end
namespace test_flag {
void f(int *p) {
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wunsafe-buffer-usage" // this flag turns off every unsafe-buffer warning
std::span<int> S{p, 10}; // no-warning
p++; // no-warning
#pragma clang diagnostic pop
#pragma clang diagnostic push
#pragma clang diagnostic warning "-Wunsafe-buffer-usage"
#pragma clang diagnostic ignored "-Wunsafe-buffer-usage-in-container"
// turn on all unsafe-buffer warnings except for the ones under `-Wunsafe-buffer-usage-in-container`
std::span<int> S2{p, 10}; // no-warning
p++; // expected-warning{{unsafe pointer arithmetic}}\
expected-note{{pass -fsafe-buffer-usage-suggestions to receive code hardening suggestions}}
#pragma clang diagnostic pop
}
} //namespace test_flag
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