| // RUN: %clang_cc1 -fexperimental-new-constant-interpreter -std=c++11 -verify %s |
| // RUN: %clang_cc1 -fexperimental-new-constant-interpreter -std=c++20 -verify %s |
| // RUN: %clang_cc1 -std=c++11 -verify=ref %s |
| // RUN: %clang_cc1 -std=c++20 -verify=ref %s |
| |
| #define INT_MIN (~__INT_MAX__) |
| #define INT_MAX __INT_MAX__ |
| |
| |
| static_assert(true, ""); |
| static_assert(false, ""); // expected-error{{failed}} ref-error{{failed}} |
| static_assert(nullptr == nullptr, ""); |
| static_assert(1 == 1, ""); |
| static_assert(1 == 3, ""); // expected-error{{failed}} ref-error{{failed}} |
| |
| constexpr int number = 10; |
| static_assert(number == 10, ""); |
| static_assert(number != 10, ""); // expected-error{{failed}} \ |
| // ref-error{{failed}} \ |
| // expected-note{{evaluates to}} \ |
| // ref-note{{evaluates to}} |
| |
| constexpr bool b = number; |
| static_assert(b, ""); |
| constexpr int one = true; |
| static_assert(one == 1, ""); |
| |
| namespace IntegralCasts { |
| constexpr int i = 12; |
| constexpr unsigned int ui = i; |
| static_assert(ui == 12, ""); |
| constexpr unsigned int ub = !false; |
| static_assert(ub == 1, ""); |
| |
| constexpr int si = ui; |
| static_assert(si == 12, ""); |
| constexpr int sb = true; |
| static_assert(sb == 1, ""); |
| |
| constexpr int zero = 0; |
| constexpr unsigned int uzero = 0; |
| constexpr bool bs = i; |
| static_assert(bs, ""); |
| constexpr bool bu = ui; |
| static_assert(bu, ""); |
| constexpr bool ns = zero; |
| static_assert(!ns, ""); |
| constexpr bool nu = uzero; |
| static_assert(!nu, ""); |
| }; |
| |
| constexpr int UninitI; // expected-error {{must be initialized by a constant expression}} \ |
| // ref-error {{must be initialized by a constant expression}} |
| constexpr int *UninitPtr; // expected-error {{must be initialized by a constant expression}} \ |
| // ref-error {{must be initialized by a constant expression}} |
| |
| constexpr bool getTrue() { return true; } |
| constexpr bool getFalse() { return false; } |
| constexpr void* getNull() { return nullptr; } |
| |
| constexpr int neg(int m) { return -m; } |
| constexpr bool inv(bool b) { return !b; } |
| |
| static_assert(12, ""); |
| static_assert(12 == -(-(12)), ""); |
| static_assert(!false, ""); |
| static_assert(!!true, ""); |
| static_assert(!!true == !false, ""); |
| static_assert(true == 1, ""); |
| static_assert(false == 0, ""); |
| static_assert(!5 == false, ""); |
| static_assert(!0, ""); |
| static_assert(-true, ""); |
| static_assert(-false, ""); //expected-error{{failed}} ref-error{{failed}} |
| |
| static_assert(~0 == -1, ""); |
| static_assert(~1 == -2, ""); |
| static_assert(~-1 == 0, ""); |
| static_assert(~255 == -256, ""); |
| static_assert(~INT_MIN == INT_MAX, ""); |
| static_assert(~INT_MAX == INT_MIN, ""); |
| |
| static_assert(-(1 << 31), ""); // expected-error {{not an integral constant expression}} \ |
| // expected-note {{outside the range of representable values}} \ |
| // ref-error {{not an integral constant expression}} \ |
| // ref-note {{outside the range of representable values}} \ |
| |
| |
| enum E {}; |
| constexpr E e = static_cast<E>(0); |
| static_assert(~e == -1, ""); |
| |
| |
| constexpr int m = 10; |
| constexpr const int *p = &m; |
| static_assert(p != nullptr, ""); |
| static_assert(*p == 10, ""); |
| |
| constexpr const int* getIntPointer() { |
| return &m; |
| } |
| static_assert(getIntPointer() == &m, ""); |
| static_assert(*getIntPointer() == 10, ""); |
| |
| constexpr int gimme(int k) { |
| return k; |
| } |
| static_assert(gimme(5) == 5, ""); |
| |
| namespace PointerToBool { |
| |
| constexpr void *N = nullptr; |
| constexpr bool B = N; |
| static_assert(!B, ""); |
| static_assert(!N, ""); |
| |
| constexpr float F = 1.0; |
| constexpr const float *FP = &F; |
| static_assert(FP, ""); |
| static_assert(!!FP, ""); |
| } |
| |
| namespace SizeOf { |
| constexpr int soint = sizeof(int); |
| constexpr int souint = sizeof(unsigned int); |
| static_assert(soint == souint, ""); |
| |
| static_assert(sizeof(&soint) == sizeof(void*), ""); |
| static_assert(sizeof(&soint) == sizeof(nullptr), ""); |
| |
| static_assert(sizeof(long) == sizeof(unsigned long), ""); |
| static_assert(sizeof(char) == sizeof(unsigned char), ""); |
| |
| constexpr int N = 4; |
| constexpr int arr[N] = {1,2,3,4}; |
| static_assert(sizeof(arr) == N * sizeof(int), ""); |
| static_assert(sizeof(arr) == N * sizeof(arr[0]), ""); |
| |
| constexpr bool arrB[N] = {true, true, true, true}; |
| static_assert(sizeof(arrB) == N * sizeof(bool), ""); |
| |
| static_assert(sizeof(bool) == 1, ""); |
| static_assert(sizeof(char) == 1, ""); |
| |
| constexpr int F = sizeof(void); // expected-error{{incomplete type 'void'}} \ |
| // ref-error{{incomplete type 'void'}} |
| |
| constexpr int F2 = sizeof(gimme); // expected-error{{to a function type}} \ |
| // ref-error{{to a function type}} |
| |
| |
| |
| /// FIXME: The following code should be accepted. |
| struct S { |
| void func(); |
| }; |
| constexpr void (S::*Func)() = &S::func; // expected-error {{must be initialized by a constant expression}} \ |
| // expected-error {{interpreter failed to evaluate an expression}} |
| static_assert(sizeof(Func) == sizeof(&S::func), ""); |
| |
| |
| void func() { |
| int n = 12; |
| constexpr int oofda = sizeof(int[n++]); // expected-error {{must be initialized by a constant expression}} \ |
| // ref-error {{must be initialized by a constant expression}} |
| } |
| |
| |
| #if __cplusplus >= 202002L |
| /// FIXME: The following code should be accepted. |
| consteval int foo(int n) { // ref-error {{consteval function never produces a constant expression}} |
| return sizeof(int[n]); // ref-note 3{{not valid in a constant expression}} \ |
| // expected-note {{not valid in a constant expression}} |
| } |
| constinit int var = foo(5); // ref-error {{not a constant expression}} \ |
| // ref-note 2{{in call to}} \ |
| // ref-error {{does not have a constant initializer}} \ |
| // ref-note {{required by 'constinit' specifier}} \ |
| // expected-error {{is not a constant expression}} \ |
| // expected-note {{in call to}} \ |
| // expected-error {{does not have a constant initializer}} \ |
| // expected-note {{required by 'constinit' specifier}} \ |
| |
| #endif |
| }; |
| |
| namespace rem { |
| static_assert(2 % 2 == 0, ""); |
| static_assert(2 % 1 == 0, ""); |
| static_assert(-3 % 4 == -3, ""); |
| static_assert(4 % -2 == 0, ""); |
| static_assert(-3 % -4 == -3, ""); |
| |
| constexpr int zero() { return 0; } |
| static_assert(10 % zero() == 20, ""); // ref-error {{not an integral constant expression}} \ |
| // ref-note {{division by zero}} \ |
| // expected-error {{not an integral constant expression}} \ |
| // expected-note {{division by zero}} |
| |
| |
| static_assert(true % true == 0, ""); |
| static_assert(false % true == 0, ""); |
| static_assert(true % false == 10, ""); // ref-error {{not an integral constant expression}} \ |
| // ref-note {{division by zero}} \ |
| // expected-error {{not an integral constant expression}} \ |
| // expected-note {{division by zero}} |
| constexpr int x = INT_MIN % - 1; // ref-error {{must be initialized by a constant expression}} \ |
| // ref-note {{value 2147483648 is outside the range}} \ |
| // expected-error {{must be initialized by a constant expression}} \ |
| // expected-note {{value 2147483648 is outside the range}} \ |
| |
| }; |
| |
| namespace div { |
| constexpr int zero() { return 0; } |
| static_assert(12 / 3 == 4, ""); |
| static_assert(12 / zero() == 12, ""); // ref-error {{not an integral constant expression}} \ |
| // ref-note {{division by zero}} \ |
| // expected-error {{not an integral constant expression}} \ |
| // expected-note {{division by zero}} |
| static_assert(12 / -3 == -4, ""); |
| static_assert(-12 / 3 == -4, ""); |
| |
| |
| constexpr int LHS = 12; |
| constexpr long unsigned RHS = 3; |
| static_assert(LHS / RHS == 4, ""); |
| |
| constexpr int x = INT_MIN / - 1; // ref-error {{must be initialized by a constant expression}} \ |
| // ref-note {{value 2147483648 is outside the range}} \ |
| // expected-error {{must be initialized by a constant expression}} \ |
| // expected-note {{value 2147483648 is outside the range}} \ |
| |
| }; |
| |
| namespace cond { |
| constexpr bool isEven(int n) { |
| return n % 2 == 0 ? true : false; |
| } |
| static_assert(isEven(2), ""); |
| static_assert(!isEven(3), ""); |
| static_assert(isEven(100), ""); |
| |
| constexpr int M = 5 ? 10 : 20; |
| static_assert(M == 10, ""); |
| |
| static_assert(5 ? 13 : 16 == 13, ""); |
| static_assert(0 ? 13 : 16 == 16, ""); |
| |
| static_assert(number ?: -15 == number, ""); |
| static_assert(0 ?: 100 == 100 , ""); |
| |
| #if __cplusplus >= 201402L |
| constexpr int N = 20; |
| constexpr int foo() { |
| int m = N > 0 ? 5 : 10; |
| |
| return m == 5 ? isEven(m) : true; |
| } |
| static_assert(foo() == false, ""); |
| |
| constexpr int dontCallMe(unsigned m) { |
| if (m == 0) return 0; |
| return dontCallMe(m - 2); |
| } |
| |
| // Can't call this because it will run into infinite recursion. |
| constexpr int assertNotReached() { |
| return dontCallMe(3); |
| } |
| |
| constexpr int testCond() { |
| return true ? 5 : assertNotReached(); |
| } |
| |
| constexpr int testCond2() { |
| return false ? assertNotReached() : 10; |
| } |
| |
| static_assert(testCond() == 5, ""); |
| static_assert(testCond2() == 10, ""); |
| |
| #endif |
| |
| }; |
| |
| namespace band { |
| static_assert((10 & 1) == 0, ""); |
| static_assert((10 & 10) == 10, ""); |
| |
| static_assert((1337 & -1) == 1337, ""); |
| static_assert((0 & gimme(12)) == 0, ""); |
| }; |
| |
| namespace bitOr { |
| static_assert((10 | 1) == 11, ""); |
| static_assert((10 | 10) == 10, ""); |
| |
| static_assert((1337 | -1) == -1, ""); |
| static_assert((0 | gimme(12)) == 12, ""); |
| static_assert((12 | true) == 13, ""); |
| }; |
| |
| namespace bitXor { |
| #pragma clang diagnostic push |
| #pragma clang diagnostic ignored "-Wxor-used-as-pow" |
| static_assert((10 ^ 1) == 11, ""); |
| static_assert((10 ^ 10) == 0, ""); |
| |
| enum { |
| ONE = 1, |
| }; |
| |
| static_assert((1337 ^ -1) == -1338, ""); |
| static_assert((0 | gimme(12)) == 12, ""); |
| static_assert((12 ^ true) == 13, ""); |
| static_assert((12 ^ ONE) == 13, ""); |
| #pragma clang diagnostic pop |
| }; |
| |
| #if __cplusplus >= 201402L |
| constexpr bool IgnoredUnary() { |
| bool bo = true; |
| !bo; // expected-warning {{expression result unused}} \ |
| // ref-warning {{expression result unused}} |
| return bo; |
| } |
| static_assert(IgnoredUnary(), ""); |
| #endif |
| |
| namespace strings { |
| constexpr const char *S = "abc"; |
| static_assert(S[0] == 97, ""); |
| static_assert(S[1] == 98, ""); |
| static_assert(S[2] == 99, ""); |
| static_assert(S[3] == 0, ""); |
| |
| static_assert("foobar"[2] == 'o', ""); |
| static_assert(2["foobar"] == 'o', ""); |
| |
| constexpr const wchar_t *wide = L"bar"; |
| static_assert(wide[0] == L'b', ""); |
| |
| constexpr const char32_t *u32 = U"abc"; |
| static_assert(u32[1] == U'b', ""); |
| |
| constexpr char32_t c = U'\U0001F60E'; |
| static_assert(c == 0x0001F60EL, ""); |
| |
| constexpr char k = -1; |
| static_assert(k == -1, ""); |
| |
| static_assert('\N{LATIN CAPITAL LETTER E}' == 'E', ""); |
| static_assert('\t' == 9, ""); |
| |
| #pragma clang diagnostic push |
| #pragma clang diagnostic ignored "-Wmultichar" |
| constexpr int mc = 'abc'; |
| static_assert(mc == 'abc', ""); |
| __WCHAR_TYPE__ wm = L'abc'; // ref-error{{wide character literals may not contain multiple characters}} \ |
| // expected-error{{wide character literals may not contain multiple characters}} |
| __WCHAR_TYPE__ wu = u'abc'; // ref-error{{Unicode character literals may not contain multiple characters}} \ |
| // expected-error{{Unicode character literals may not contain multiple characters}} |
| __WCHAR_TYPE__ wU = U'abc'; // ref-error{{Unicode character literals may not contain multiple characters}} \ |
| // expected-error{{Unicode character literals may not contain multiple characters}} |
| #if __cplusplus > 201103L |
| __WCHAR_TYPE__ wu8 = u8'abc'; // ref-error{{Unicode character literals may not contain multiple characters}} \ |
| // expected-error{{Unicode character literals may not contain multiple characters}} |
| #endif |
| |
| #pragma clang diagnostic pop |
| |
| constexpr char foo[12] = "abc"; |
| static_assert(foo[0] == 'a', ""); |
| static_assert(foo[1] == 'b', ""); |
| static_assert(foo[2] == 'c', ""); |
| static_assert(foo[3] == 0, ""); |
| static_assert(foo[11] == 0, ""); |
| |
| constexpr char foo2[] = "abc\0def"; |
| static_assert(foo2[0] == 'a', ""); |
| static_assert(foo2[3] == '\0', ""); |
| static_assert(foo2[6] == 'f', ""); |
| static_assert(foo2[7] == '\0', ""); |
| static_assert(foo2[8] == '\0', ""); // expected-error {{not an integral constant expression}} \ |
| // expected-note {{read of dereferenced one-past-the-end pointer}} \ |
| // ref-error {{not an integral constant expression}} \ |
| // ref-note {{read of dereferenced one-past-the-end pointer}} |
| |
| constexpr char foo3[4] = "abc"; |
| static_assert(foo3[3] == '\0', ""); |
| static_assert(foo3[4] == '\0', ""); // expected-error {{not an integral constant expression}} \ |
| // expected-note {{read of dereferenced one-past-the-end pointer}} \ |
| // ref-error {{not an integral constant expression}} \ |
| // ref-note {{read of dereferenced one-past-the-end pointer}} |
| |
| constexpr char foo4[2] = "abcd"; // expected-error {{initializer-string for char array is too long}} \ |
| // ref-error {{initializer-string for char array is too long}} |
| static_assert(foo4[0] == 'a', ""); |
| static_assert(foo4[1] == 'b', ""); |
| static_assert(foo4[2] == '\0', ""); // expected-error {{not an integral constant expression}} \ |
| // expected-note {{read of dereferenced one-past-the-end pointer}} \ |
| // ref-error {{not an integral constant expression}} \ |
| // ref-note {{read of dereferenced one-past-the-end pointer}} |
| |
| constexpr char foo5[12] = "abc\xff"; |
| #if defined(__CHAR_UNSIGNED__) || __CHAR_BIT__ > 8 |
| static_assert(foo5[3] == 255, ""); |
| #else |
| static_assert(foo5[3] == -1, ""); |
| #endif |
| }; |
| |
| #if __cplusplus > 201402L |
| namespace IncDec { |
| constexpr int zero() { |
| int a = 0; |
| a++; |
| ++a; |
| a--; |
| --a; |
| return a; |
| } |
| static_assert(zero() == 0, ""); |
| |
| constexpr int preInc() { |
| int a = 0; |
| return ++a; |
| } |
| static_assert(preInc() == 1, ""); |
| |
| constexpr int postInc() { |
| int a = 0; |
| return a++; |
| } |
| static_assert(postInc() == 0, ""); |
| |
| constexpr int preDec() { |
| int a = 0; |
| return --a; |
| } |
| static_assert(preDec() == -1, ""); |
| |
| constexpr int postDec() { |
| int a = 0; |
| return a--; |
| } |
| static_assert(postDec() == 0, ""); |
| |
| constexpr int three() { |
| int a = 0; |
| return ++a + ++a; // expected-warning {{multiple unsequenced modifications to 'a'}} \ |
| // ref-warning {{multiple unsequenced modifications to 'a'}} \ |
| |
| } |
| static_assert(three() == 3, ""); |
| |
| constexpr bool incBool() { |
| bool b = false; |
| return ++b; // expected-error {{ISO C++17 does not allow incrementing expression of type bool}} \ |
| // ref-error {{ISO C++17 does not allow incrementing expression of type bool}} |
| } |
| static_assert(incBool(), ""); |
| |
| constexpr int uninit() { |
| int a; |
| ++a; // ref-note {{increment of uninitialized}} \ |
| // FIXME: Should also be rejected by new interpreter |
| return 1; |
| } |
| static_assert(uninit(), ""); // ref-error {{not an integral constant expression}} \ |
| // ref-note {{in call to 'uninit()'}} |
| |
| constexpr int OverFlow() { // ref-error {{never produces a constant expression}} \ |
| // expected-error {{never produces a constant expression}} |
| int a = INT_MAX; |
| ++a; // ref-note 2{{is outside the range}} \ |
| // expected-note 2{{is outside the range}} |
| return -1; |
| } |
| static_assert(OverFlow() == -1, ""); // expected-error {{not an integral constant expression}} \ |
| // expected-note {{in call to 'OverFlow()'}} \ |
| // ref-error {{not an integral constant expression}} \ |
| // ref-note {{in call to 'OverFlow()'}} |
| |
| |
| constexpr int UnderFlow() { // ref-error {{never produces a constant expression}} \ |
| // expected-error {{never produces a constant expression}} |
| int a = INT_MIN; |
| --a; // ref-note 2{{is outside the range}} \ |
| // expected-note 2{{is outside the range}} |
| return -1; |
| } |
| static_assert(UnderFlow() == -1, ""); // expected-error {{not an integral constant expression}} \ |
| // expected-note {{in call to 'UnderFlow()'}} \ |
| // ref-error {{not an integral constant expression}} \ |
| // ref-note {{in call to 'UnderFlow()'}} |
| |
| constexpr int getTwo() { |
| int i = 1; |
| return (i += 1); |
| } |
| static_assert(getTwo() == 2, ""); |
| |
| constexpr int sub(int a) { |
| return (a -= 2); |
| } |
| static_assert(sub(7) == 5, ""); |
| |
| constexpr int add(int a, int b) { |
| a += b; // expected-note {{is outside the range of representable values}} \ |
| // ref-note {{is outside the range of representable values}} |
| return a; |
| } |
| static_assert(add(1, 2) == 3, ""); |
| static_assert(add(INT_MAX, 1) == 0, ""); // expected-error {{not an integral constant expression}} \ |
| // expected-note {{in call to 'add}} \ |
| // ref-error {{not an integral constant expression}} \ |
| // ref-note {{in call to 'add}} |
| |
| constexpr int sub(int a, int b) { |
| a -= b; // expected-note {{is outside the range of representable values}} \ |
| // ref-note {{is outside the range of representable values}} |
| return a; |
| } |
| static_assert(sub(10, 20) == -10, ""); |
| static_assert(sub(INT_MIN, 1) == 0, ""); // expected-error {{not an integral constant expression}} \ |
| // expected-note {{in call to 'sub}} \ |
| // ref-error {{not an integral constant expression}} \ |
| // ref-note {{in call to 'sub}} |
| |
| constexpr int subAll(int a) { |
| return (a -= a); |
| } |
| static_assert(subAll(213) == 0, ""); |
| |
| constexpr bool BoolOr(bool b1, bool b2) { |
| bool a; |
| a = b1; |
| a |= b2; |
| return a; |
| } |
| static_assert(BoolOr(true, true), ""); |
| static_assert(BoolOr(true, false), ""); |
| static_assert(BoolOr(false, true), ""); |
| static_assert(!BoolOr(false, false), ""); |
| |
| constexpr int IntOr(unsigned a, unsigned b) { |
| unsigned r; |
| r = a; |
| r |= b; |
| return r; |
| } |
| static_assert(IntOr(10, 1) == 11, ""); |
| static_assert(IntOr(1337, -1) == -1, ""); |
| static_assert(IntOr(0, 12) == 12, ""); |
| |
| constexpr bool BoolAnd(bool b1, bool b2) { |
| bool a; |
| a = b1; |
| a &= b2; |
| return a; |
| } |
| static_assert(BoolAnd(true, true), ""); |
| static_assert(!BoolAnd(true, false), ""); |
| static_assert(!BoolAnd(false, true), ""); |
| static_assert(!BoolAnd(false, false), ""); |
| |
| constexpr int IntAnd(unsigned a, unsigned b) { |
| unsigned r; |
| r = a; |
| r &= b; |
| return r; |
| } |
| static_assert(IntAnd(10, 1) == 0, ""); |
| static_assert(IntAnd(1337, -1) == 1337, ""); |
| static_assert(IntAnd(0, 12) == 0, ""); |
| |
| constexpr bool BoolXor(bool b1, bool b2) { |
| bool a; |
| a = b1; |
| a ^= b2; |
| return a; |
| } |
| static_assert(!BoolXor(true, true), ""); |
| static_assert(BoolXor(true, false), ""); |
| static_assert(BoolXor(false, true), ""); |
| static_assert(!BoolXor(false, false), ""); |
| |
| constexpr int IntXor(unsigned a, unsigned b) { |
| unsigned r; |
| r = a; |
| r ^= b; |
| return r; |
| } |
| static_assert(IntXor(10, 1) == 11, ""); |
| static_assert(IntXor(10, 10) == 0, ""); |
| static_assert(IntXor(12, true) == 13, ""); |
| |
| constexpr bool BoolRem(bool b1, bool b2) { |
| bool a; |
| a = b1; |
| a %= b2; |
| return a; |
| } |
| static_assert(!BoolRem(true, true), ""); |
| static_assert(!BoolRem(false, true), ""); |
| |
| constexpr int IntRem(int a, int b) { |
| int r; |
| r = a; |
| r %= b; // expected-note {{division by zero}} \ |
| // ref-note {{division by zero}} \ |
| // expected-note {{outside the range of representable values}} \ |
| // ref-note {{outside the range of representable values}} |
| return r; |
| } |
| static_assert(IntRem(2, 2) == 0, ""); |
| static_assert(IntRem(2, 1) == 0, ""); |
| static_assert(IntRem(9, 7) == 2, ""); |
| static_assert(IntRem(5, 0) == 0, ""); // expected-error {{not an integral constant expression}} \ |
| // expected-note {{in call to 'IntRem(5, 0)'}} \ |
| // ref-error {{not an integral constant expression}} \ |
| // ref-note {{in call to 'IntRem(5, 0)'}} |
| |
| static_assert(IntRem(INT_MIN, -1) == 0, ""); // expected-error {{not an integral constant expression}} \ |
| // expected-note {{in call to 'IntRem}} \ |
| // ref-error {{not an integral constant expression}} \ |
| // ref-note {{in call to 'IntRem}} |
| |
| |
| |
| constexpr bool BoolDiv(bool b1, bool b2) { |
| bool a; |
| a = b1; |
| a /= b2; |
| return a; |
| } |
| static_assert(BoolDiv(true, true), ""); |
| static_assert(!BoolDiv(false, true), ""); |
| |
| constexpr int IntDiv(int a, int b) { |
| int r; |
| r = a; |
| r /= b; // expected-note {{division by zero}} \ |
| // ref-note {{division by zero}} \ |
| // expected-note {{outside the range of representable values}} \ |
| // ref-note {{outside the range of representable values}} |
| return r; |
| } |
| static_assert(IntDiv(2, 2) == 1, ""); |
| static_assert(IntDiv(12, 20) == 0, ""); |
| static_assert(IntDiv(2, 1) == 2, ""); |
| static_assert(IntDiv(9, 7) == 1, ""); |
| static_assert(IntDiv(5, 0) == 0, ""); // expected-error {{not an integral constant expression}} \ |
| // expected-note {{in call to 'IntDiv(5, 0)'}} \ |
| // ref-error {{not an integral constant expression}} \ |
| // ref-note {{in call to 'IntDiv(5, 0)'}} |
| |
| static_assert(IntDiv(INT_MIN, -1) == 0, ""); // expected-error {{not an integral constant expression}} \ |
| // expected-note {{in call to 'IntDiv}} \ |
| // ref-error {{not an integral constant expression}} \ |
| // ref-note {{in call to 'IntDiv}} |
| |
| constexpr bool BoolMul(bool b1, bool b2) { |
| bool a; |
| a = b1; |
| a *= b2; |
| return a; |
| } |
| static_assert(BoolMul(true, true), ""); |
| static_assert(!BoolMul(true, false), ""); |
| static_assert(!BoolMul(false, true), ""); |
| static_assert(!BoolMul(false, false), ""); |
| |
| constexpr int IntMul(int a, int b) { |
| int r; |
| r = a; |
| r *= b; // expected-note {{is outside the range of representable values of type 'int'}} \ |
| // ref-note {{is outside the range of representable values of type 'int'}} |
| return r; |
| } |
| static_assert(IntMul(2, 2) == 4, ""); |
| static_assert(IntMul(12, 20) == 240, ""); |
| static_assert(IntMul(2, 1) == 2, ""); |
| static_assert(IntMul(9, 7) == 63, ""); |
| static_assert(IntMul(INT_MAX, 2) == 0, ""); // expected-error {{not an integral constant expression}} \ |
| // expected-note {{in call to 'IntMul}} \ |
| // ref-error {{not an integral constant expression}} \ |
| // ref-note {{in call to 'IntMul}} |
| constexpr int arr[] = {1,2,3}; |
| constexpr int ptrInc1() { |
| const int *p = arr; |
| p += 2; |
| return *p; |
| } |
| static_assert(ptrInc1() == 3, ""); |
| |
| constexpr int ptrInc2() { |
| const int *p = arr; |
| return *(p += 1); |
| } |
| static_assert(ptrInc2() == 2, ""); |
| |
| constexpr int ptrInc3() { // expected-error {{never produces a constant expression}} \ |
| // ref-error {{never produces a constant expression}} |
| const int *p = arr; |
| p += 12; // expected-note {{cannot refer to element 12 of array of 3 elements}} \ |
| // ref-note {{cannot refer to element 12 of array of 3 elements}} |
| return *p; |
| } |
| |
| constexpr int ptrIncDec1() { |
| const int *p = arr; |
| p += 2; |
| p -= 1; |
| return *p; |
| } |
| static_assert(ptrIncDec1() == 2, ""); |
| |
| constexpr int ptrDec1() { // expected-error {{never produces a constant expression}} \ |
| // ref-error {{never produces a constant expression}} |
| const int *p = arr; |
| p -= 1; // expected-note {{cannot refer to element -1 of array of 3 elements}} \ |
| // ref-note {{cannot refer to element -1 of array of 3 elements}} |
| return *p; |
| } |
| |
| /// This used to leave a 0 on the stack instead of the previous |
| /// value of a. |
| constexpr int bug1Inc() { |
| int a = 3; |
| int b = a++; |
| return b; |
| } |
| static_assert(bug1Inc() == 3); |
| |
| constexpr int bug1Dec() { |
| int a = 3; |
| int b = a--; |
| return b; |
| } |
| static_assert(bug1Dec() == 3); |
| |
| }; |
| #endif |
| |
| namespace CompoundLiterals { |
| constexpr int get5() { |
| return (int[]){1,2,3,4,5}[4]; |
| } |
| static_assert(get5() == 5, ""); |
| |
| constexpr int get6(int f = (int[]){1,2,6}[2]) { // ref-note {{subexpression not valid in a constant expression}} \ |
| // ref-note {{declared here}} |
| return f; |
| } |
| static_assert(get6(6) == 6, ""); |
| // FIXME: Who's right here? |
| static_assert(get6() == 6, ""); // ref-error {{not an integral constant expression}} |
| |
| constexpr int x = (int){3}; |
| static_assert(x == 3, ""); |
| #if __cplusplus >= 201402L |
| constexpr int getX() { |
| int x = (int){3}; |
| x = (int){5}; |
| return x; |
| } |
| static_assert(getX() == 5, ""); |
| #endif |
| |
| #if __cplusplus >= 202002L |
| constexpr int get3() { |
| int m; |
| m = (int){3}; |
| return m; |
| } |
| static_assert(get3() == 3, ""); |
| #endif |
| }; |
| |
| namespace TypeTraits { |
| static_assert(__is_trivial(int), ""); |
| static_assert(__is_trivial(float), ""); |
| static_assert(__is_trivial(E), ""); |
| struct S{}; |
| static_assert(__is_trivial(S), ""); |
| struct S2 { |
| S2() {} |
| }; |
| static_assert(!__is_trivial(S2), ""); |
| |
| template <typename T> |
| struct S3 { |
| constexpr bool foo() const { return __is_trivial(T); } |
| }; |
| struct T { |
| ~T() {} |
| }; |
| struct U {}; |
| static_assert(S3<U>{}.foo(), ""); |
| static_assert(!S3<T>{}.foo(), ""); |
| } |
| |
| #if __cplusplus >= 201402L |
| constexpr int ignoredDecls() { |
| static_assert(true, ""); |
| struct F { int a; }; |
| enum E { b }; |
| using A = int; |
| typedef int Z; |
| |
| return F{12}.a; |
| } |
| static_assert(ignoredDecls() == 12, ""); |
| |
| struct A{}; |
| constexpr int ignoredExprs() { |
| (void)(1 / 2); |
| A a; |
| a; // expected-warning {{unused}} \ |
| // ref-warning {{unused}} |
| (void)a; |
| (a); // expected-warning {{unused}} \ |
| // ref-warning {{unused}} |
| |
| return 0; |
| } |
| |
| #endif |
