100 lines · cpp
1// RUN: %clang_cc1 %s -std=c++11 -fsyntax-only -verify -triple x86_64-linux-gnu2 3struct S;4constexpr int extract(const S &s);5 6struct S {7 constexpr S() : n(extract(*this)), m(0) {} // expected-note {{in call to 'extract(s1)'}}8 constexpr S(int k) : n(k), m(extract(*this)) {}9 int n, m;10};11 12constexpr int extract(const S &s) { return s.n; } // expected-note {{read of object outside its lifetime is not allowed in a constant expression}}13 14void f() {15 constexpr S s1; // expected-error {{constant expression}} expected-note {{in call to 'S()'}}16 constexpr S s2(10);17}18 19typedef __attribute__((vector_size(16))) int vector_int;20 21struct T {22 constexpr T() : arr() {}23 int arr[4];24};25struct U : T {26 constexpr U(const int *p) : T(), another(), p(p) {}27 constexpr U(const U &u) : T(), another(), p(u.p) {}28 T another;29 const int *p;30};31constexpr U u1(&u1.arr[2]);32 33constexpr int test_printing(int a, float b, _Complex int c, _Complex float d,34 int *e, int &f, vector_int g, U h) {35 return *e; // expected-note {{read of non-constexpr variable 'u2'}}36}37U u2(0); // expected-note {{here}}38static_assert(test_printing(12, 39.762, 3 + 4i, 12.9 + 3.6i, &u2.arr[4], u2.another.arr[2], (vector_int){5, 1, 2, 3}, u1) == 0, ""); // \39expected-error {{constant expression}} \40expected-note {{in call to 'test_printing(12, 3.976200e+01, 3+4i, 1.290000e+01+3.600000e+00i, &u2.T::arr[4], u2.another.arr[2], {5, 1, 2, 3}, {{{}}, {{}}, &u1.T::arr[2]})'}}41 42struct V {43 int arr[256] = {[255] = 42}; // expected-warning {{C99}}44};45constexpr V v;46constexpr int get(const int *p) { return *p; } // expected-note {{read of dereferenced one-past-the-end pointer}}47constexpr int passLargeArray(V v) { return get(v.arr+256); } // expected-note {{in call to 'get(&v.arr[256])'}}48static_assert(passLargeArray(v) == 0, ""); // expected-error {{constant expression}} expected-note {{in call to 'passLargeArray({{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, ...}})'}}49 50union Union {51 constexpr Union(int n) : b(n) {}52 constexpr Union(const Union &u) : b(u.b) {}53 int a, b;54};55constexpr Union myUnion = 76;56 57constexpr int badness(Union u) { return u.a + u.b; } // expected-note {{read of member 'a' of union with active member 'b'}}58static_assert(badness(myUnion), ""); // expected-error {{constant expression}} \59 expected-note {{in call to 'badness({.b = 76})'}}60 61struct MemPtrTest {62 int n;63 void f();64};65MemPtrTest mpt; // expected-note {{here}}66constexpr int MemPtr(int (MemPtrTest::*a), void (MemPtrTest::*b)(), int &c) {67 return c; // expected-note {{read of non-constexpr variable 'mpt'}}68}69static_assert(MemPtr(&MemPtrTest::n, &MemPtrTest::f, mpt.*&MemPtrTest::n), ""); // expected-error {{constant expression}} \70expected-note {{in call to 'MemPtr(&MemPtrTest::n, &MemPtrTest::f, mpt.n)'}}71 72template<typename CharT>73constexpr CharT get(const CharT *p) { return p[-1]; } // expected-note 5{{}}74 75constexpr char c = get("test\0\\\"\t\a\b\234"); // \76 expected-error {{}} expected-note {{"test\000\\\"\t\a\b\234"}}77constexpr char c8 = get(u8"test\0\\\"\t\a\b\234"); // \78 expected-error {{}} expected-note {{u8"test\000\\\"\t\a\b\234"}}79constexpr char16_t c16 = get(u"test\0\\\"\t\a\b\234\u1234"); // \80 expected-error {{}} expected-note {{u"test\000\\\"\t\a\b\234\u1234"}}81constexpr char32_t c32 = get(U"test\0\\\"\t\a\b\234\u1234\U0010ffff"); // \82 expected-error {{}} expected-note {{U"test\000\\\"\t\a\b\234\u1234\U0010FFFF"}}83constexpr wchar_t wc = get(L"test\0\\\"\t\a\b\234\u1234\xffffffff"); // \84 expected-error {{}} expected-note {{L"test\000\\\"\t\a\b\234\x1234\xFFFFFFFF"}}85 86constexpr char32_t c32_err = get(U"\U00110000"); // expected-error {{invalid universal character}}87 88#define fold(x) (__builtin_constant_p(x) ? (x) : (x))89 90typedef decltype(sizeof(int)) LabelDiffTy;91constexpr LabelDiffTy mulBy3(LabelDiffTy x) { return x * 3; } // expected-note {{subexpression}}92void LabelDiffTest() {93 static_assert(mulBy3(fold((LabelDiffTy)&&a-(LabelDiffTy)&&b)) == 3, ""); // expected-error {{constant expression}} expected-note {{call to 'mulBy3(&&a - &&b)'}}94 a:b:return;95}96 97constexpr bool test_bool_printing(bool b) { return 1 / !(2*b | !(2*b)); } // expected-note 2{{division by zero}}98constexpr bool test_bool_0 = test_bool_printing(false); // expected-error {{constant expr}} expected-note {{in call to 'test_bool_printing(false)'}}99constexpr bool test_bool_1 = test_bool_printing(true); // expected-error {{constant expr}} expected-note {{in call to 'test_bool_printing(true)'}}100