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// RUN: %clang_cc1 -std=c++20 -Wno-all -Wunsafe-buffer-usage-in-container -verify %s
typedef unsigned int size_t;
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){};
T* begin() noexcept;
T* end() noexcept;
};
template< class T >
T&& move( T&& t ) noexcept;
template <class _Tp>
_Tp* addressof(_Tp& __x) {
return &__x;
}
template <typename T, size_t N>
struct array {
T* begin() noexcept;
const T* begin() const noexcept;
T* end() noexcept;
const T* end() const noexcept;
size_t size() const noexcept;
T * data() const noexcept;
T& operator[](size_t n);
};
template<class T>
class initializer_list {
public:
size_t size() const noexcept;
const T* begin() const noexcept;
const T* end() const noexcept;
T * data() const noexcept;
};
template<typename T>
struct basic_string {
T *c_str() const noexcept;
T *data() const noexcept;
unsigned size();
const T* begin() const noexcept;
const T* end() const noexcept;
};
typedef basic_string<char> string;
typedef basic_string<wchar_t> wstring;
}
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}}
}
// addressof method defined outside std namespace.
template <class _Tp>
_Tp* addressof(_Tp& __x) {
return &__x;
}
void notWarnSafeCases(unsigned n, int *p) {
int X;
unsigned Y = 10;
std::span<int> S = std::span{&X, 1}; // no-warning
S = std::span{std::addressof(X), 1}; // no-warning
int Arr[10];
typedef int TenInts_t[10];
TenInts_t Arr2;
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{std::addressof(X), 2}; // expected-warning{{the two-parameter std::span construction is unsafe as it can introduce mismatch between buffer size and the bound information}}
// Warn when a non std method also named addressof
S = std::span{addressof(X), 1}; // 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{Arr2, 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_alloc_size_attr {
void * my_alloc(unsigned size) __attribute__((alloc_size(1)));
void * my_alloc2(unsigned count, unsigned size) __attribute__((alloc_size(1,2)));
void safe(int x, unsigned y) {
std::span<char>{(char *)my_alloc(10), 10};
std::span<char>{(char *)my_alloc(x), x};
std::span<char>{(char *)my_alloc(x * y), x * y};
std::span<char>{(char *)my_alloc(x * y), y * x};
std::span<char>{(char *)my_alloc(x * y + x), x * y + x};
std::span<char>{(char *)my_alloc(x * y + x), x + y * x};
std::span<char>{(char *)my_alloc2(x, y), x * y};
std::span<char>{(char *)my_alloc2(x, y), y * x};
//foo(std::span<char>{(char *)my_alloc2(x, sizeof(char)), x}); // lets not worry about this case for now
std::span<char>{(char *)my_alloc2(x, sizeof(char)), x * sizeof(char)};
//foo(std::span<char>{(char *)my_alloc2(10, sizeof(char)), 10});
std::span<char>{(char *)my_alloc2(10, sizeof(char)), 10 * sizeof(char)};
}
void unsafe(int x, int y) {
std::span<char>{(char *)my_alloc(10), 11}; // expected-warning{{the two-parameter std::span construction is unsafe as it can introduce mismatch between buffer size and the bound information}}
std::span<char>{(char *)my_alloc(x * y), x + y}; // 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>{(int *)my_alloc(x), x}; // expected-warning{{the two-parameter std::span construction is unsafe as it can introduce mismatch between buffer size and the bound information}}
std::span<char>{(char *)my_alloc2(x, y), x + y}; // expected-warning{{the two-parameter std::span construction is unsafe as it can introduce mismatch between buffer size and the bound information}}
}
void unsupport(int x, int y, int z) {
// Casting to `T*` where sizeof(T) > 1 is not supported yet:
std::span<int>{(int *)my_alloc2(x, y), x * y}; // expected-warning{{the two-parameter std::span construction is unsafe as it can introduce mismatch between buffer size and the bound information}}
std::span<long>{(long *)my_alloc(10 * sizeof(long)), 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<long>{(long *)my_alloc2(x, sizeof(long)), x}; // expected-warning{{the two-parameter std::span construction is unsafe as it can introduce mismatch between buffer size and the bound information}}
std::span<long>{(long *)my_alloc2(x, sizeof(long)), x}; // expected-warning{{the two-parameter std::span construction is unsafe as it can introduce mismatch between buffer size and the bound information}}
// The expression is too complicated:
std::span<char>{(char *)my_alloc(x + y + z), z + y + x}; // expected-warning{{the two-parameter std::span construction is unsafe as it can introduce mismatch between buffer size and the bound information}}
}
}
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
struct HoldsStdSpanAndInitializedInCtor {
char* Ptr;
unsigned Size;
std::span<char> Span{Ptr, Size}; // no-warning (this code is unreachable)
HoldsStdSpanAndInitializedInCtor(char* P, unsigned S)
: Span(P, S) // expected-warning{{the two-parameter std::span construction is unsafe as it can introduce mismatch between buffer size and the bound information}}
{}
};
struct HoldsStdSpanAndNotInitializedInCtor {
char* Ptr;
unsigned Size;
std::span<char> Span{Ptr, Size}; // expected-warning{{the two-parameter std::span construction is unsafe as it can introduce mismatch between buffer size and the bound information}}
HoldsStdSpanAndNotInitializedInCtor(char* P, unsigned S)
: Ptr(P), Size(S)
{}
};
namespace test_begin_end {
struct Object {
int * begin();
int * end();
};
void safe_cases(std::span<int> Sp, std::array<int, 10> Arr, std::string Str, std::initializer_list<Object> Il) {
std::span<int>{Sp.begin(), Sp.end()};
std::span<int>{Arr.begin(), Arr.end()};
std::span<char>{Str.begin(), Str.end()};
std::span<Object>{Il.begin(), Il.end()};
}
void unsafe_cases(std::span<int> Sp, std::array<int, 10> Arr, std::string Str, std::initializer_list<Object> Il,
Object Obj) {
std::span<int>{Obj.begin(), Obj.end()}; // 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>{Sp.end(), Sp.begin()}; // 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>{Sp.begin(), Arr.end()}; // expected-warning {{the two-parameter std::span construction is unsafe as it can introduce mismatch between buffer size and the bound information}}
}
void unsupport_cases(std::array<Object, 10> Arr) {
std::span<int>{Arr[0].begin(), Arr[0].end()}; // 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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