600 lines
22 KiB
C++
600 lines
22 KiB
C++
// RUN: %clang_cc1 -fexperimental-new-constant-interpreter -verify %s
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// RUN: %clang_cc1 -fexperimental-new-constant-interpreter -std=c++20 -verify %s
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// RUN: %clang_cc1 -verify=ref %s
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// RUN: %clang_cc1 -verify=ref -std=c++20 %s
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constexpr int m = 3;
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constexpr const int *foo[][5] = {
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{nullptr, &m, nullptr, nullptr, nullptr},
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{nullptr, nullptr, &m, nullptr, nullptr},
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{nullptr, nullptr, nullptr, &m, nullptr},
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};
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static_assert(foo[0][0] == nullptr, "");
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static_assert(foo[0][1] == &m, "");
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static_assert(foo[0][2] == nullptr, "");
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static_assert(foo[0][3] == nullptr, "");
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static_assert(foo[0][4] == nullptr, "");
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static_assert(foo[1][0] == nullptr, "");
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static_assert(foo[1][1] == nullptr, "");
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static_assert(foo[1][2] == &m, "");
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static_assert(foo[1][3] == nullptr, "");
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static_assert(foo[1][4] == nullptr, "");
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static_assert(foo[2][0] == nullptr, "");
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static_assert(foo[2][1] == nullptr, "");
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static_assert(foo[2][2] == nullptr, "");
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static_assert(foo[2][3] == &m, "");
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static_assert(foo[2][4] == nullptr, "");
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constexpr int SomeInt[] = {1};
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constexpr int getSomeInt() { return *SomeInt; }
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static_assert(getSomeInt() == 1, "");
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/// A init list for a primitive value.
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constexpr int f{5};
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static_assert(f == 5, "");
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constexpr int getElement(int i) {
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int values[] = {1, 4, 9, 16, 25, 36};
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return values[i];
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}
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static_assert(getElement(1) == 4, "");
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static_assert(getElement(5) == 36, "");
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constexpr int data[] = {5, 4, 3, 2, 1};
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constexpr int getElement(const int *Arr, int index) {
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return *(Arr + index);
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}
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constexpr int derefPtr(const int *d) {
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return *d;
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}
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static_assert(derefPtr(data) == 5, "");
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constexpr int storePtr() {
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int b[] = {1,2,3,4};
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int *c = b;
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*c = 4;
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return *c;
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}
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static_assert(storePtr() == 4, "");
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static_assert(getElement(data, 1) == 4, "");
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static_assert(getElement(data, 4) == 1, "");
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constexpr int getElementFromEnd(const int *Arr, int size, int index) {
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return *(Arr + size - index - 1);
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}
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static_assert(getElementFromEnd(data, 5, 0) == 1, "");
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static_assert(getElementFromEnd(data, 5, 4) == 5, "");
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constexpr int getFirstElem(const int *a) {
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return a[0]; // expected-note {{read of dereferenced null pointer}} \
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// ref-note {{read of dereferenced null pointer}}
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}
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static_assert(getFirstElem(nullptr) == 1, ""); // expected-error {{not an integral constant expression}} \
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// expected-note {{in call to}} \
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// ref-error {{not an integral constant expression}} \
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// ref-note {{in call to}}
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constexpr static int arr[2] = {1,2};
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constexpr static int arr2[2] = {3,4};
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constexpr int *p1 = nullptr;
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constexpr int *p2 = p1 + 1; // expected-error {{must be initialized by a constant expression}} \
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// expected-note {{cannot perform pointer arithmetic on null pointer}} \
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// ref-error {{must be initialized by a constant expression}} \
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// ref-note {{cannot perform pointer arithmetic on null pointer}}
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constexpr int *p3 = p1 + 0;
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constexpr int *p4 = p1 - 0;
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constexpr int *p5 = 0 + p1;
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constexpr int *p6 = 0 - p1; // expected-error {{invalid operands to binary expression}} \
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// ref-error {{invalid operands to binary expression}}
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constexpr int const * ap1 = &arr[0];
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constexpr int const * ap2 = ap1 + 3; // expected-error {{must be initialized by a constant expression}} \
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// expected-note {{cannot refer to element 3 of array of 2}} \
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// ref-error {{must be initialized by a constant expression}} \
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// ref-note {{cannot refer to element 3 of array of 2}}
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constexpr auto ap3 = arr - 1; // expected-error {{must be initialized by a constant expression}} \
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// expected-note {{cannot refer to element -1}} \
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// ref-error {{must be initialized by a constant expression}} \
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// ref-note {{cannot refer to element -1}}
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constexpr int k1 = &arr[1] - &arr[0];
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static_assert(k1 == 1, "");
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static_assert((&arr[0] - &arr[1]) == -1, "");
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constexpr int k2 = &arr2[1] - &arr[0]; // expected-error {{must be initialized by a constant expression}} \
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// ref-error {{must be initialized by a constant expression}}
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static_assert((arr + 0) == arr, "");
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static_assert(&arr[0] == arr, "");
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static_assert(*(&arr[0]) == 1, "");
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static_assert(*(&arr[1]) == 2, "");
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constexpr const int *OOB = (arr + 3) - 3; // expected-error {{must be initialized by a constant expression}} \
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// expected-note {{cannot refer to element 3 of array of 2}} \
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// ref-error {{must be initialized by a constant expression}} \
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// ref-note {{cannot refer to element 3 of array of 2}}
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template<typename T>
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constexpr T getElementOf(T* array, int i) {
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return array[i];
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}
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static_assert(getElementOf(foo[0], 1) == &m, "");
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template <typename T, int N>
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constexpr T& getElementOfArray(T (&array)[N], int I) {
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return array[I];
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}
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static_assert(getElementOfArray(foo[2], 3) == &m, "");
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static_assert(data[0] == 4, ""); // expected-error{{failed}} \
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// expected-note{{5 == 4}} \
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// ref-error{{failed}} \
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// ref-note{{5 == 4}}
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constexpr int dynamic[] = {
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f, 3, 2 + 5, data[3], *getElementOf(foo[2], 3)
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};
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static_assert(dynamic[0] == f, "");
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static_assert(dynamic[3] == 2, "");
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constexpr int dependent[4] = {
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0, 1, dependent[0], dependent[1]
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};
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static_assert(dependent[2] == dependent[0], "");
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static_assert(dependent[3] == dependent[1], "");
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#pragma clang diagnostic push
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#pragma clang diagnostic ignored "-Wc99-extensions"
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#pragma clang diagnostic ignored "-Winitializer-overrides"
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constexpr int DI[] = {
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[0] = 10,
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[1] = 20,
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30,
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40,
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[1] = 50
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};
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static_assert(DI[0] == 10, "");
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static_assert(DI[1] == 50, "");
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static_assert(DI[2] == 30, "");
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static_assert(DI[3] == 40, "");
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constexpr int addThreeElements(const int v[3]) {
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return v[0] + v[1] + v[2];
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}
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constexpr int is[] = {10, 20, 30 };
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static_assert(addThreeElements(is) == 60, "");
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struct fred {
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char s [6];
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int n;
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};
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struct fred y [] = { [0] = { .s[0] = 'q' } };
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#pragma clang diagnostic pop
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namespace indices {
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constexpr int first[] = {1};
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constexpr int firstValue = first[2]; // ref-error {{must be initialized by a constant expression}} \
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// ref-note {{cannot refer to element 2 of array of 1}} \
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// expected-error {{must be initialized by a constant expression}} \
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// expected-note {{cannot refer to element 2 of array of 1}}
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constexpr int second[10] = {17};
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constexpr int secondValue = second[10];// ref-error {{must be initialized by a constant expression}} \
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// ref-note {{read of dereferenced one-past-the-end pointer}} \
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// expected-error {{must be initialized by a constant expression}} \
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// expected-note {{read of dereferenced one-past-the-end pointer}}
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constexpr int negative = second[-2]; // ref-error {{must be initialized by a constant expression}} \
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// ref-note {{cannot refer to element -2 of array of 10}} \
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// expected-error {{must be initialized by a constant expression}} \
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// expected-note {{cannot refer to element -2 of array of 10}}
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};
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namespace DefaultInit {
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template <typename T, unsigned N>
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struct B {
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T a[N];
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};
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int f() {
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constexpr B<int,10> arr = {};
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constexpr int x = arr.a[0];
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}
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};
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class A {
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public:
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int a;
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constexpr A(int m = 2) : a(10 + m) {}
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};
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class AU {
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public:
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int a;
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constexpr AU() : a(5 / 0) {} // expected-warning {{division by zero is undefined}} \
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// expected-note 2{{division by zero}} \
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// expected-error {{never produces a constant expression}} \
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// ref-error {{never produces a constant expression}} \
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// ref-note 2{{division by zero}} \
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// ref-warning {{division by zero is undefined}}
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};
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class B {
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public:
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A a[2];
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constexpr B() {}
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};
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constexpr B b;
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static_assert(b.a[0].a == 12, "");
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static_assert(b.a[1].a == 12, "");
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class BU {
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public:
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AU a[2];
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constexpr BU() {} // expected-note {{in call to 'AU()'}} \
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// ref-note {{in call to 'AU()'}}
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};
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constexpr BU bu; // expected-error {{must be initialized by a constant expression}} \
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// expected-note {{in call to 'BU()'}} \
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// ref-error {{must be initialized by a constant expression}} \
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// ref-note {{in call to 'BU()'}}
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namespace IncDec {
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constexpr int getNextElem(const int *A, int I) {
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const int *B = (A + I);
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++B;
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return *B;
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}
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constexpr int E[] = {1,2,3,4};
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static_assert(getNextElem(E, 1) == 3, "");
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constexpr int getFirst() {
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const int *e = E;
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return *(e++);
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}
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static_assert(getFirst() == 1, "");
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constexpr int getFirst2() {
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const int *e = E;
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e++;
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return *e;
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}
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static_assert(getFirst2() == 2, "");
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constexpr int getSecond() {
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const int *e = E;
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return *(++e);
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}
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static_assert(getSecond() == 2, "");
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constexpr int getSecond2() {
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const int *e = E;
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++e;
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return *e;
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}
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static_assert(getSecond2() == 2, "");
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constexpr int getLast() {
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const int *e = E + 3;
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return *(e--);
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}
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static_assert(getLast() == 4, "");
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constexpr int getLast2() {
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const int *e = E + 3;
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e--;
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return *e;
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}
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static_assert(getLast2() == 3, "");
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constexpr int getSecondToLast() {
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const int *e = E + 3;
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return *(--e);
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}
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static_assert(getSecondToLast() == 3, "");
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constexpr int getSecondToLast2() {
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const int *e = E + 3;
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--e;
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return *e;
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}
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static_assert(getSecondToLast2() == 3, "");
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constexpr int bad1() { // ref-error {{never produces a constant expression}} \
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// expected-error {{never produces a constant expression}}
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const int *e = E + 3;
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e++; // This is fine because it's a one-past-the-end pointer
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return *e; // expected-note 2{{read of dereferenced one-past-the-end pointer}} \
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// ref-note 2{{read of dereferenced one-past-the-end pointer}}
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}
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static_assert(bad1() == 0, ""); // expected-error {{not an integral constant expression}} \
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// expected-note {{in call to}} \
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// ref-error {{not an integral constant expression}} \
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// ref-note {{in call to}}
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constexpr int bad2() { // ref-error {{never produces a constant expression}} \
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// expected-error {{never produces a constant expression}}
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const int *e = E + 4;
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e++; // expected-note 2{{cannot refer to element 5 of array of 4 elements}} \
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// ref-note 2{{cannot refer to element 5 of array of 4 elements}}
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return *e; // This is UB as well
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}
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static_assert(bad2() == 0, ""); // expected-error {{not an integral constant expression}} \
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// expected-note {{in call to}} \
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// ref-error {{not an integral constant expression}} \
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// ref-note {{in call to}}
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constexpr int bad3() { // ref-error {{never produces a constant expression}} \
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// expected-error {{never produces a constant expression}}
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const int *e = E;
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e--; // expected-note 2{{cannot refer to element -1 of array of 4 elements}} \
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// ref-note 2{{cannot refer to element -1 of array of 4 elements}}
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return *e; // This is UB as well
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}
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static_assert(bad3() == 0, ""); // expected-error {{not an integral constant expression}} \
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// expected-note {{in call to}} \
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// ref-error {{not an integral constant expression}} \
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// ref-note {{in call to}}
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constexpr int nullptr1(bool Pre) {
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int *a = nullptr;
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if (Pre)
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++a; // ref-note {{arithmetic on null pointer}} \
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// expected-note {{arithmetic on null pointer}}
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else
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a++; // ref-note {{arithmetic on null pointer}} \
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// expected-note {{arithmetic on null pointer}}
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return 1;
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}
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static_assert(nullptr1(true) == 1, ""); // ref-error {{not an integral constant expression}} \
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// ref-note {{in call to}} \
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// expected-error {{not an integral constant expression}} \
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// expected-note {{in call to}}
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static_assert(nullptr1(false) == 1, ""); // ref-error {{not an integral constant expression}} \
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// ref-note {{in call to}} \
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// expected-error {{not an integral constant expression}} \
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// expected-note {{in call to}}
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};
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namespace ZeroInit {
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struct A {
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int *p[2];
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};
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constexpr A a = {};
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static_assert(a.p[0] == nullptr, "");
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static_assert(a.p[1] == nullptr, "");
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struct B {
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double f[2];
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};
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constexpr B b = {};
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static_assert(b.f[0] == 0.0, "");
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static_assert(b.f[1] == 0.0, "");
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}
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namespace ArrayInitLoop {
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struct X {
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int arr[3];
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};
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constexpr X f(int &r) {
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return {++r, ++r, ++r};
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}
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constexpr int g() {
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int n = 0;
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auto [a, b, c] = f(n).arr;
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return a + b + c;
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}
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static_assert(g() == 6, "");
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}
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namespace StringZeroFill {
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struct A {
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char c[6];
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};
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constexpr A a = { "abc" };
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static_assert(a.c[0] == 'a', "");
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static_assert(a.c[1] == 'b', "");
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static_assert(a.c[2] == 'c', "");
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static_assert(a.c[3] == '\0', "");
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static_assert(a.c[4] == '\0', "");
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static_assert(a.c[5] == '\0', "");
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constexpr char b[6] = "foo";
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static_assert(b[0] == 'f', "");
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static_assert(b[1] == 'o', "");
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static_assert(b[2] == 'o', "");
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static_assert(b[3] == '\0', "");
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static_assert(b[4] == '\0', "");
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static_assert(b[5] == '\0', "");
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}
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namespace NoInitMapLeak {
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#pragma clang diagnostic push
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#pragma clang diagnostic ignored "-Wdivision-by-zero"
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#pragma clang diagnostic ignored "-Wc++20-extensions"
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constexpr int testLeak() { // expected-error {{never produces a constant expression}} \
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// ref-error {{never produces a constant expression}}
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int a[2];
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a[0] = 1;
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// interrupts interpretation.
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(void)(1 / 0); // expected-note 2{{division by zero}} \
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// ref-note 2{{division by zero}}
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return 1;
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}
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#pragma clang diagnostic pop
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static_assert(testLeak() == 1, ""); // expected-error {{not an integral constant expression}} \
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// expected-note {{in call to 'testLeak()'}} \
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// ref-error {{not an integral constant expression}} \
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// ref-note {{in call to 'testLeak()'}}
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constexpr int a[] = {1,2,3,4/0,5}; // expected-error {{must be initialized by a constant expression}} \
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// expected-note {{division by zero}} \
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// ref-error {{must be initialized by a constant expression}} \
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// ref-note {{division by zero}} \
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// ref-note {{declared here}}
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/// FIXME: This should fail in the new interpreter as well.
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constexpr int b = a[0]; // ref-error {{must be initialized by a constant expression}} \
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// ref-note {{is not a constant expression}} \
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// ref-note {{declared here}}
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static_assert(b == 1, ""); // ref-error {{not an integral constant expression}} \
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// ref-note {{not a constant expression}}
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constexpr int f() { // expected-error {{never produces a constant expression}} \
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// ref-error {{never produces a constant expression}}
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int a[] = {19,2,3/0,4}; // expected-note 2{{division by zero}} \
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// expected-warning {{is undefined}} \
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// ref-note 2{{division by zero}} \
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// ref-warning {{is undefined}}
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return 1;
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}
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static_assert(f() == 1, ""); // expected-error {{not an integral constant expression}} \
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// expected-note {{in call to}} \
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// ref-error {{not an integral constant expression}} \
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// ref-note {{in call to}}
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}
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namespace Incomplete {
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struct Foo {
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char c;
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int a[];
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};
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constexpr Foo F{};
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constexpr const int *A = F.a; // ref-error {{must be initialized by a constant expression}} \
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// ref-note {{array-to-pointer decay of array member without known bound}} \
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// expected-error {{must be initialized by a constant expression}} \
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// expected-note {{array-to-pointer decay of array member without known bound}}
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constexpr const int *B = F.a + 1; // ref-error {{must be initialized by a constant expression}} \
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// ref-note {{array-to-pointer decay of array member without known bound}} \
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// expected-error {{must be initialized by a constant expression}} \
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|
// expected-note {{array-to-pointer decay of array member without known bound}}
|
|
|
|
constexpr int C = *F.a; // ref-error {{must be initialized by a constant expression}} \
|
|
// ref-note {{array-to-pointer decay of array member without known bound}} \
|
|
// expected-error {{must be initialized by a constant expression}} \
|
|
// expected-note {{array-to-pointer decay of array member without known bound}}
|
|
|
|
|
|
|
|
/// These are from test/SemaCXX/constant-expression-cxx11.cpp
|
|
/// and are the only tests using the 'indexing of array without known bound' diagnostic.
|
|
/// We currently diagnose them differently.
|
|
extern int arr[]; // expected-note 3{{declared here}}
|
|
constexpr int *c = &arr[1]; // ref-error {{must be initialized by a constant expression}} \
|
|
// ref-note {{indexing of array without known bound}} \
|
|
// expected-error {{must be initialized by a constant expression}} \
|
|
// expected-note {{read of non-constexpr variable 'arr'}}
|
|
constexpr int *d = &arr[1]; // ref-error {{must be initialized by a constant expression}} \
|
|
// ref-note {{indexing of array without known bound}} \
|
|
// expected-error {{must be initialized by a constant expression}} \
|
|
// expected-note {{read of non-constexpr variable 'arr'}}
|
|
constexpr int *e = arr + 1; // ref-error {{must be initialized by a constant expression}} \
|
|
// ref-note {{indexing of array without known bound}} \
|
|
// expected-error {{must be initialized by a constant expression}} \
|
|
// expected-note {{read of non-constexpr variable 'arr'}}
|
|
}
|
|
|
|
namespace GH69115 {
|
|
/// This used to crash because we were trying to emit destructors for the
|
|
/// array.
|
|
constexpr int foo() {
|
|
int arr[2][2] = {1, 2, 3, 4};
|
|
return 0;
|
|
}
|
|
static_assert(foo() == 0, "");
|
|
|
|
/// Test that we still emit the destructors for multi-dimensional
|
|
/// composite arrays.
|
|
#if __cplusplus >= 202002L
|
|
constexpr void assert(bool C) {
|
|
if (C)
|
|
return;
|
|
// Invalid in constexpr.
|
|
(void)(1 / 0); // expected-warning {{undefined}} \
|
|
// ref-warning {{undefined}}
|
|
}
|
|
|
|
class F {
|
|
public:
|
|
int a;
|
|
int *dtor;
|
|
int &idx;
|
|
constexpr F(int a, int *dtor, int &idx) : a(a), dtor(dtor), idx(idx) {}
|
|
constexpr ~F() noexcept(false){
|
|
dtor[idx] = a;
|
|
++idx;
|
|
}
|
|
};
|
|
constexpr int foo2() {
|
|
int dtorIndices[] = {0, 0, 0, 0};
|
|
int idx = 0;
|
|
|
|
{
|
|
F arr[2][2] = {F(1, dtorIndices, idx),
|
|
F(2, dtorIndices, idx),
|
|
F(3, dtorIndices, idx),
|
|
F(4, dtorIndices, idx)};
|
|
}
|
|
|
|
/// Reverse-reverse order.
|
|
assert(idx == 4);
|
|
assert(dtorIndices[0] == 4);
|
|
assert(dtorIndices[1] == 3);
|
|
assert(dtorIndices[2] == 2);
|
|
assert(dtorIndices[3] == 1);
|
|
|
|
return 0;
|
|
}
|
|
static_assert(foo2() == 0, "");
|
|
#endif
|
|
}
|
|
|
|
namespace NonConstReads {
|
|
#if __cplusplus >= 202002L
|
|
void *p = nullptr; // ref-note {{declared here}} \
|
|
// expected-note {{declared here}}
|
|
|
|
int arr[!p]; // ref-error {{not allowed at file scope}} \
|
|
// expected-error {{not allowed at file scope}} \
|
|
// ref-warning {{variable length arrays}} \
|
|
// ref-note {{read of non-constexpr variable 'p'}} \
|
|
// expected-warning {{variable length arrays}} \
|
|
// expected-note {{read of non-constexpr variable 'p'}}
|
|
int z; // ref-note {{declared here}} \
|
|
// expected-note {{declared here}}
|
|
int a[z]; // ref-error {{not allowed at file scope}} \
|
|
// expected-error {{not allowed at file scope}} \
|
|
// ref-warning {{variable length arrays}} \
|
|
// ref-note {{read of non-const variable 'z'}} \
|
|
// expected-warning {{variable length arrays}} \
|
|
// expected-note {{read of non-const variable 'z'}}
|
|
#else
|
|
void *p = nullptr;
|
|
int arr[!p]; // ref-error {{not allowed at file scope}} \
|
|
// expected-error {{not allowed at file scope}}
|
|
int z;
|
|
int a[z]; // ref-error {{not allowed at file scope}} \
|
|
// expected-error {{not allowed at file scope}}
|
|
#endif
|
|
|
|
const int y = 0;
|
|
int yy[y];
|
|
}
|