1450 lines
46 KiB
C++
1450 lines
46 KiB
C++
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// RUN: %clang_cc1 -std=c++2a -verify %s -fcxx-exceptions -triple=x86_64-linux-gnu -Wno-mismatched-new-delete
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#include "Inputs/std-compare.h"
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namespace std {
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struct type_info;
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struct destroying_delete_t {
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explicit destroying_delete_t() = default;
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} inline constexpr destroying_delete{};
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struct nothrow_t {
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explicit nothrow_t() = default;
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} inline constexpr nothrow{};
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using size_t = decltype(sizeof(0));
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enum class align_val_t : size_t {};
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};
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[[nodiscard]] void *operator new(std::size_t, const std::nothrow_t&) noexcept;
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[[nodiscard]] void *operator new(std::size_t, std::align_val_t, const std::nothrow_t&) noexcept;
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[[nodiscard]] void *operator new[](std::size_t, const std::nothrow_t&) noexcept;
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[[nodiscard]] void *operator new[](std::size_t, std::align_val_t, const std::nothrow_t&) noexcept;
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[[nodiscard]] void *operator new[](std::size_t, std::align_val_t);
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void operator delete(void*, const std::nothrow_t&) noexcept;
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void operator delete(void*, std::align_val_t, const std::nothrow_t&) noexcept;
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void operator delete[](void*, const std::nothrow_t&) noexcept;
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void operator delete[](void*, std::align_val_t, const std::nothrow_t&) noexcept;
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// Helper to print out values for debugging.
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constexpr void not_defined();
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template<typename T> constexpr void print(T) { not_defined(); }
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namespace ThreeWayComparison {
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struct A {
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int n;
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constexpr friend int operator<=>(const A &a, const A &b) {
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return a.n < b.n ? -1 : a.n > b.n ? 1 : 0;
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}
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};
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static_assert(A{1} <=> A{2} < 0);
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static_assert(A{2} <=> A{1} > 0);
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static_assert(A{2} <=> A{2} == 0);
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static_assert(1 <=> 2 < 0);
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static_assert(2 <=> 1 > 0);
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static_assert(1 <=> 1 == 0);
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constexpr int k = (1 <=> 1, 0);
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// expected-warning@-1 {{three-way comparison result unused}}
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static_assert(std::strong_ordering::equal == 0);
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constexpr void f() {
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void(1 <=> 1);
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}
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struct MemPtr {
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void foo() {}
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void bar() {}
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int data;
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int data2;
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long data3;
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};
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struct MemPtr2 {
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void foo() {}
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void bar() {}
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int data;
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int data2;
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long data3;
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};
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using MemPtrT = void (MemPtr::*)();
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using FnPtrT = void (*)();
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void FnPtr1() {}
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void FnPtr2() {}
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#define CHECK(...) ((__VA_ARGS__) ? void() : throw "error")
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#define CHECK_TYPE(...) static_assert(__is_same(__VA_ARGS__));
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constexpr bool test_constexpr_success = [] {
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{
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auto &EQ = std::strong_ordering::equal;
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auto &LESS = std::strong_ordering::less;
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auto &GREATER = std::strong_ordering::greater;
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using SO = std::strong_ordering;
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auto eq = (42 <=> 42);
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CHECK_TYPE(decltype(eq), SO);
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CHECK(eq.test_eq(EQ));
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auto less = (-1 <=> 0);
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CHECK_TYPE(decltype(less), SO);
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CHECK(less.test_eq(LESS));
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auto greater = (42l <=> 1u);
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CHECK_TYPE(decltype(greater), SO);
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CHECK(greater.test_eq(GREATER));
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}
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{
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using PO = std::partial_ordering;
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auto EQUIV = PO::equivalent;
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auto LESS = PO::less;
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auto GREATER = PO::greater;
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auto eq = (42.0 <=> 42.0);
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CHECK_TYPE(decltype(eq), PO);
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CHECK(eq.test_eq(EQUIV));
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auto less = (39.0 <=> 42.0);
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CHECK_TYPE(decltype(less), PO);
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CHECK(less.test_eq(LESS));
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auto greater = (-10.123 <=> -101.1);
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CHECK_TYPE(decltype(greater), PO);
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CHECK(greater.test_eq(GREATER));
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}
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return true;
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}();
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int dummy = 42;
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int dummy2 = 101;
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constexpr bool tc9 = (&dummy <=> &dummy2) != 0; // expected-error {{constant expression}} expected-note {{unspecified}}
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template <class T, class R, class I>
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constexpr T makeComplex(R r, I i) {
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T res{r, i};
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return res;
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};
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} // namespace ThreeWayComparison
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constexpr bool for_range_init() {
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int k = 0;
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for (int arr[3] = {1, 2, 3}; int n : arr) k += n;
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return k == 6;
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}
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static_assert(for_range_init());
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namespace Virtual {
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struct NonZeroOffset { int padding = 123; };
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constexpr void assert(bool b) { if (!b) throw 0; }
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// Ensure that we pick the right final overrider during construction.
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struct A {
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virtual constexpr char f() const { return 'A'; }
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char a = f();
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constexpr ~A() { assert(f() == 'A'); }
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};
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struct NoOverrideA : A {};
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struct B : NonZeroOffset, NoOverrideA {
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virtual constexpr char f() const { return 'B'; }
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char b = f();
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constexpr ~B() { assert(f() == 'B'); }
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};
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struct NoOverrideB : B {};
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struct C : NonZeroOffset, A {
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virtual constexpr char f() const { return 'C'; }
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A *pba;
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char c = ((A*)this)->f();
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char ba = pba->f();
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constexpr C(A *pba) : pba(pba) {}
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constexpr ~C() { assert(f() == 'C'); }
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};
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struct D : NonZeroOffset, NoOverrideB, C { // expected-warning {{inaccessible}}
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virtual constexpr char f() const { return 'D'; }
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char d = f();
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constexpr D() : C((B*)this) {}
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constexpr ~D() { assert(f() == 'D'); }
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};
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constexpr int n = (D(), 0);
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constexpr D d;
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static_assert(((B&)d).a == 'A');
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static_assert(((C&)d).a == 'A');
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static_assert(d.b == 'B');
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static_assert(d.c == 'C');
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// During the construction of C, the dynamic type of B's A is B.
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static_assert(d.ba == 'B');
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static_assert(d.d == 'D');
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static_assert(d.f() == 'D');
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constexpr const A &a = (B&)d;
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constexpr const B &b = d;
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static_assert(a.f() == 'D');
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static_assert(b.f() == 'D');
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// FIXME: It is unclear whether this should be permitted.
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D d_not_constexpr;
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static_assert(d_not_constexpr.f() == 'D'); // expected-error {{constant expression}} expected-note {{virtual function called on object 'd_not_constexpr' whose dynamic type is not constant}}
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// Check that we apply a proper adjustment for a covariant return type.
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struct Covariant1 {
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D d;
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virtual const A *f() const;
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};
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template<typename T>
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struct Covariant2 : Covariant1 {
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virtual const T *f() const;
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};
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template<typename T>
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struct Covariant3 : Covariant2<T> {
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constexpr virtual const D *f() const { return &this->d; }
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};
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constexpr Covariant3<B> cb;
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constexpr Covariant3<C> cc;
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constexpr const Covariant1 *cb1 = &cb;
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constexpr const Covariant2<B> *cb2 = &cb;
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static_assert(cb1->f()->a == 'A');
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static_assert(cb1->f() == (B*)&cb.d);
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static_assert(cb1->f()->f() == 'D');
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static_assert(cb2->f()->b == 'B');
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static_assert(cb2->f() == &cb.d);
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static_assert(cb2->f()->f() == 'D');
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constexpr const Covariant1 *cc1 = &cc;
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constexpr const Covariant2<C> *cc2 = &cc;
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static_assert(cc1->f()->a == 'A');
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static_assert(cc1->f() == (C*)&cc.d);
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static_assert(cc1->f()->f() == 'D');
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static_assert(cc2->f()->c == 'C');
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static_assert(cc2->f() == &cc.d);
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static_assert(cc2->f()->f() == 'D');
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static_assert(cb.f()->d == 'D');
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static_assert(cc.f()->d == 'D');
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struct Abstract {
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constexpr virtual void f() = 0; // expected-note {{declared here}}
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constexpr Abstract() { do_it(); } // expected-note {{in call to}}
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constexpr void do_it() { f(); } // expected-note {{pure virtual function 'Virtual::Abstract::f' called}}
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};
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struct PureVirtualCall : Abstract { void f(); }; // expected-note {{in call to 'Abstract}}
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constexpr PureVirtualCall pure_virtual_call; // expected-error {{constant expression}} expected-note {{in call to 'PureVirtualCall}}
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}
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namespace DynamicCast {
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struct A2 { virtual void a2(); };
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struct A : A2 { virtual void a(); };
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struct B : A {};
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struct C2 { virtual void c2(); };
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struct C : A, C2 { A *c = dynamic_cast<A*>(static_cast<C2*>(this)); };
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struct D { virtual void d(); };
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struct E { virtual void e(); };
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struct F : B, C, D, private E { void *f = dynamic_cast<void*>(static_cast<D*>(this)); };
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struct Padding { virtual void padding(); };
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struct G : Padding, F {};
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constexpr G g;
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// During construction of C, A is unambiguous subobject of dynamic type C.
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static_assert(g.c == (C*)&g);
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// ... but in the complete object, the same is not true, so the runtime fails.
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static_assert(dynamic_cast<const A*>(static_cast<const C2*>(&g)) == nullptr);
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// dynamic_cast<void*> produces a pointer to the object of the dynamic type.
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static_assert(g.f == (void*)(F*)&g);
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static_assert(dynamic_cast<const void*>(static_cast<const D*>(&g)) == &g);
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// expected-note@+1 {{reference dynamic_cast failed: 'DynamicCast::A' is an ambiguous base class of dynamic type 'DynamicCast::G' of operand}}
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constexpr int d_a = (dynamic_cast<const A&>(static_cast<const D&>(g)), 0); // expected-error {{}}
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// Can navigate from A2 to its A...
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static_assert(&dynamic_cast<A&>((A2&)(B&)g) == &(A&)(B&)g);
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// ... and from B to its A ...
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static_assert(&dynamic_cast<A&>((B&)g) == &(A&)(B&)g);
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// ... but not from D.
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// expected-note@+1 {{reference dynamic_cast failed: 'DynamicCast::A' is an ambiguous base class of dynamic type 'DynamicCast::G' of operand}}
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static_assert(&dynamic_cast<A&>((D&)g) == &(A&)(B&)g); // expected-error {{}}
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// Can cast from A2 to sibling class D.
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static_assert(&dynamic_cast<D&>((A2&)(B&)g) == &(D&)g);
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// Cannot cast from private base E to derived class F.
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// expected-note@+1 {{reference dynamic_cast failed: static type 'DynamicCast::E' of operand is a non-public base class of dynamic type 'DynamicCast::G'}}
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constexpr int e_f = (dynamic_cast<F&>((E&)g), 0); // expected-error {{}}
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// Cannot cast from B to private sibling E.
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// expected-note@+1 {{reference dynamic_cast failed: 'DynamicCast::E' is a non-public base class of dynamic type 'DynamicCast::G' of operand}}
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constexpr int b_e = (dynamic_cast<E&>((B&)g), 0); // expected-error {{}}
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struct Unrelated { virtual void unrelated(); };
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// expected-note@+1 {{reference dynamic_cast failed: dynamic type 'DynamicCast::G' of operand does not have a base class of type 'DynamicCast::Unrelated'}}
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constexpr int b_unrelated = (dynamic_cast<Unrelated&>((B&)g), 0); // expected-error {{}}
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// expected-note@+1 {{reference dynamic_cast failed: dynamic type 'DynamicCast::G' of operand does not have a base class of type 'DynamicCast::Unrelated'}}
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constexpr int e_unrelated = (dynamic_cast<Unrelated&>((E&)g), 0); // expected-error {{}}
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}
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namespace TypeId {
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struct A {
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const std::type_info &ti = typeid(*this);
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};
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struct A2 : A {};
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static_assert(&A().ti == &typeid(A));
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static_assert(&typeid((A2())) == &typeid(A2));
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extern A2 extern_a2;
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static_assert(&typeid(extern_a2) == &typeid(A2));
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constexpr A2 a2;
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constexpr const A &a1 = a2;
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static_assert(&typeid(a1) == &typeid(A));
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struct B {
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virtual void f();
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const std::type_info &ti1 = typeid(*this);
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};
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struct B2 : B {
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const std::type_info &ti2 = typeid(*this);
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};
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static_assert(&B2().ti1 == &typeid(B));
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static_assert(&B2().ti2 == &typeid(B2));
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extern B2 extern_b2;
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// expected-note@+1 {{typeid applied to object 'extern_b2' whose dynamic type is not constant}}
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static_assert(&typeid(extern_b2) == &typeid(B2)); // expected-error {{constant expression}}
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constexpr B2 b2;
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constexpr const B &b1 = b2;
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static_assert(&typeid(b1) == &typeid(B2));
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constexpr bool side_effects() {
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// Not polymorphic nor a glvalue.
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bool OK = true;
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(void)typeid(OK = false, A2()); // expected-warning {{has no effect}}
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if (!OK) return false;
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// Not polymorphic.
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A2 a2;
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(void)typeid(OK = false, a2); // expected-warning {{has no effect}}
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if (!OK) return false;
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// Not a glvalue.
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(void)typeid(OK = false, B2()); // expected-warning {{has no effect}}
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if (!OK) return false;
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// Polymorphic glvalue: operand evaluated.
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OK = false;
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B2 b2;
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(void)typeid(OK = true, b2); // expected-warning {{will be evaluated}}
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return OK;
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}
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||
|
|
static_assert(side_effects());
|
||
|
|
}
|
||
|
|
|
||
|
|
namespace Union {
|
||
|
|
struct Base {
|
||
|
|
int y; // expected-note 2{{here}}
|
||
|
|
};
|
||
|
|
struct A : Base {
|
||
|
|
int x;
|
||
|
|
int arr[3];
|
||
|
|
union { int p, q; };
|
||
|
|
};
|
||
|
|
union B {
|
||
|
|
A a;
|
||
|
|
int b;
|
||
|
|
};
|
||
|
|
constexpr int read_wrong_member() { // expected-error {{never produces a constant}}
|
||
|
|
B b = {.b = 1};
|
||
|
|
return b.a.x; // expected-note {{read of member 'a' of union with active member 'b'}}
|
||
|
|
}
|
||
|
|
constexpr int change_member() {
|
||
|
|
B b = {.b = 1};
|
||
|
|
b.a.x = 1;
|
||
|
|
return b.a.x;
|
||
|
|
}
|
||
|
|
static_assert(change_member() == 1);
|
||
|
|
constexpr int change_member_then_read_wrong_member() { // expected-error {{never produces a constant}}
|
||
|
|
B b = {.b = 1};
|
||
|
|
b.a.x = 1;
|
||
|
|
return b.b; // expected-note {{read of member 'b' of union with active member 'a'}}
|
||
|
|
}
|
||
|
|
constexpr int read_wrong_member_indirect() { // expected-error {{never produces a constant}}
|
||
|
|
B b = {.b = 1};
|
||
|
|
int *p = &b.a.y;
|
||
|
|
return *p; // expected-note {{read of member 'a' of union with active member 'b'}}
|
||
|
|
}
|
||
|
|
constexpr int read_uninitialized() {
|
||
|
|
B b = {.b = 1};
|
||
|
|
int *p = &b.a.y;
|
||
|
|
b.a.x = 1;
|
||
|
|
return *p; // expected-note {{read of uninitialized object}}
|
||
|
|
}
|
||
|
|
static_assert(read_uninitialized() == 0); // expected-error {{constant}} expected-note {{in call}}
|
||
|
|
constexpr void write_wrong_member_indirect() { // expected-error {{never produces a constant}}
|
||
|
|
B b = {.b = 1};
|
||
|
|
int *p = &b.a.y;
|
||
|
|
*p = 1; // expected-note {{assignment to member 'a' of union with active member 'b'}}
|
||
|
|
}
|
||
|
|
constexpr int write_uninitialized() {
|
||
|
|
B b = {.b = 1};
|
||
|
|
int *p = &b.a.y;
|
||
|
|
b.a.x = 1;
|
||
|
|
*p = 1;
|
||
|
|
return *p;
|
||
|
|
}
|
||
|
|
static_assert(write_uninitialized() == 1);
|
||
|
|
constexpr int change_member_indirectly() {
|
||
|
|
B b = {.b = 1};
|
||
|
|
b.a.arr[1] = 1;
|
||
|
|
int &r = b.a.y;
|
||
|
|
r = 123;
|
||
|
|
|
||
|
|
b.b = 2;
|
||
|
|
b.a.y = 3;
|
||
|
|
b.a.arr[2] = 4;
|
||
|
|
return b.a.arr[2];
|
||
|
|
}
|
||
|
|
static_assert(change_member_indirectly() == 4);
|
||
|
|
constexpr B return_uninit() {
|
||
|
|
B b = {.b = 1};
|
||
|
|
b.a.x = 2;
|
||
|
|
return b;
|
||
|
|
}
|
||
|
|
constexpr B uninit = return_uninit(); // expected-error {{constant expression}} expected-note {{subobject of type 'int' is not initialized}}
|
||
|
|
static_assert(return_uninit().a.x == 2);
|
||
|
|
constexpr A return_uninit_struct() {
|
||
|
|
B b = {.b = 1};
|
||
|
|
b.a.x = 2;
|
||
|
|
return b.a; // expected-note {{in call to 'A(b.a)'}} expected-note {{subobject of type 'int' is not initialized}}
|
||
|
|
}
|
||
|
|
// Note that this is rejected even though return_uninit() is accepted, and
|
||
|
|
// return_uninit() copies the same stuff wrapped in a union.
|
||
|
|
//
|
||
|
|
// Copying a B involves copying the object representation of the union, but
|
||
|
|
// copying an A invokes a copy constructor that copies the object
|
||
|
|
// elementwise, and reading from b.a.y is undefined.
|
||
|
|
static_assert(return_uninit_struct().x == 2); // expected-error {{constant expression}} expected-note {{in call}}
|
||
|
|
constexpr B return_init_all() {
|
||
|
|
B b = {.b = 1};
|
||
|
|
b.a.x = 2;
|
||
|
|
b.a.y = 3;
|
||
|
|
b.a.arr[0] = 4;
|
||
|
|
b.a.arr[1] = 5;
|
||
|
|
b.a.arr[2] = 6;
|
||
|
|
return b;
|
||
|
|
}
|
||
|
|
static_assert(return_init_all().a.x == 2);
|
||
|
|
static_assert(return_init_all().a.y == 3);
|
||
|
|
static_assert(return_init_all().a.arr[0] == 4);
|
||
|
|
static_assert(return_init_all().a.arr[1] == 5);
|
||
|
|
static_assert(return_init_all().a.arr[2] == 6);
|
||
|
|
static_assert(return_init_all().a.p == 7); // expected-error {{}} expected-note {{read of member 'p' of union with no active member}}
|
||
|
|
static_assert(return_init_all().a.q == 8); // expected-error {{}} expected-note {{read of member 'q' of union with no active member}}
|
||
|
|
constexpr B init_all = return_init_all();
|
||
|
|
|
||
|
|
constexpr bool test_no_member_change = []{
|
||
|
|
union U { char dummy = {}; };
|
||
|
|
U u1;
|
||
|
|
U u2;
|
||
|
|
u1 = u2;
|
||
|
|
return true;
|
||
|
|
}();
|
||
|
|
|
||
|
|
struct S1 {
|
||
|
|
int n;
|
||
|
|
};
|
||
|
|
struct S2 : S1 {};
|
||
|
|
struct S3 : S2 {};
|
||
|
|
void f() {
|
||
|
|
S3 s;
|
||
|
|
s.n = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
union ref_member_1 {
|
||
|
|
int a;
|
||
|
|
int b;
|
||
|
|
};
|
||
|
|
struct ref_member_2 {
|
||
|
|
ref_member_1 &&r;
|
||
|
|
};
|
||
|
|
union ref_member_3 {
|
||
|
|
ref_member_2 a, b;
|
||
|
|
};
|
||
|
|
constexpr int ref_member_test_1() {
|
||
|
|
ref_member_3 r = {.a = {.r = {.a = 1}}};
|
||
|
|
r.a.r.b = 2;
|
||
|
|
return r.a.r.b;
|
||
|
|
}
|
||
|
|
static_assert(ref_member_test_1() == 2);
|
||
|
|
constexpr int ref_member_test_2() { // expected-error {{never produces a constant}}
|
||
|
|
ref_member_3 r = {.a = {.r = {.a = 1}}};
|
||
|
|
// FIXME: This note isn't great. The 'read' here is reading the referent of the reference.
|
||
|
|
r.b.r.b = 2; // expected-note {{read of member 'b' of union with active member 'a'}}
|
||
|
|
return r.b.r.b;
|
||
|
|
}
|
||
|
|
|
||
|
|
namespace PR43762 {
|
||
|
|
struct A { int x = 1; constexpr int f() { return 1; } };
|
||
|
|
struct B : A { int y = 1; constexpr int g() { return 2; } };
|
||
|
|
struct C {
|
||
|
|
int x;
|
||
|
|
constexpr virtual int f() = 0;
|
||
|
|
};
|
||
|
|
struct D : C {
|
||
|
|
int y;
|
||
|
|
constexpr virtual int f() override { return 3; }
|
||
|
|
};
|
||
|
|
|
||
|
|
union U {
|
||
|
|
int n;
|
||
|
|
B b;
|
||
|
|
D d;
|
||
|
|
};
|
||
|
|
|
||
|
|
constexpr int test(int which) {
|
||
|
|
U u{.n = 5};
|
||
|
|
switch (which) {
|
||
|
|
case 0:
|
||
|
|
u.b.x = 10; // expected-note {{active member 'n'}}
|
||
|
|
return u.b.f();
|
||
|
|
case 1:
|
||
|
|
u.b.y = 10; // expected-note {{active member 'n'}}
|
||
|
|
return u.b.g();
|
||
|
|
case 2:
|
||
|
|
u.d.x = 10; // expected-note {{active member 'n'}}
|
||
|
|
return u.d.f();
|
||
|
|
case 3:
|
||
|
|
u.d.y = 10; // expected-note {{active member 'n'}}
|
||
|
|
return u.d.f();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static_assert(test(0)); // expected-error {{}} expected-note {{in call}}
|
||
|
|
static_assert(test(1)); // expected-error {{}} expected-note {{in call}}
|
||
|
|
static_assert(test(2)); // expected-error {{}} expected-note {{in call}}
|
||
|
|
static_assert(test(3)); // expected-error {{}} expected-note {{in call}}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
namespace TwosComplementShifts {
|
||
|
|
using uint32 = __UINT32_TYPE__;
|
||
|
|
using int32 = __INT32_TYPE__;
|
||
|
|
static_assert(uint32(int32(0x1234) << 16) == 0x12340000);
|
||
|
|
static_assert(uint32(int32(0x1234) << 19) == 0x91a00000);
|
||
|
|
static_assert(uint32(int32(0x1234) << 20) == 0x23400000); // expected-warning {{requires 34 bits}}
|
||
|
|
static_assert(uint32(int32(0x1234) << 24) == 0x34000000); // expected-warning {{requires 38 bits}}
|
||
|
|
static_assert(uint32(int32(-1) << 31) == 0x80000000);
|
||
|
|
|
||
|
|
static_assert(-1 >> 1 == -1);
|
||
|
|
static_assert(-1 >> 31 == -1);
|
||
|
|
static_assert(-2 >> 1 == -1);
|
||
|
|
static_assert(-3 >> 1 == -2);
|
||
|
|
static_assert(-4 >> 1 == -2);
|
||
|
|
}
|
||
|
|
|
||
|
|
namespace Uninit {
|
||
|
|
constexpr int f(bool init) {
|
||
|
|
int a;
|
||
|
|
if (init)
|
||
|
|
a = 1;
|
||
|
|
return a; // expected-note {{read of uninitialized object}}
|
||
|
|
}
|
||
|
|
static_assert(f(true) == 1);
|
||
|
|
static_assert(f(false) == 1); // expected-error {{constant expression}} expected-note {{in call}}
|
||
|
|
|
||
|
|
struct X {
|
||
|
|
int n; // expected-note {{declared here}}
|
||
|
|
constexpr X(bool init) {
|
||
|
|
if (init) n = 123;
|
||
|
|
}
|
||
|
|
};
|
||
|
|
constinit X x1(true);
|
||
|
|
constinit X x2(false); // expected-error {{constant initializer}} expected-note {{constinit}} expected-note {{subobject of type 'int' is not initialized}}
|
||
|
|
|
||
|
|
struct Y {
|
||
|
|
struct Z { int n; }; // expected-note {{here}}
|
||
|
|
Z z1;
|
||
|
|
Z z2;
|
||
|
|
Z z3;
|
||
|
|
// OK: the lifetime of z1 (and its members) start before the initializer of
|
||
|
|
// z2 runs.
|
||
|
|
constexpr Y() : z2{ (z1.n = 1, z1.n + 1) } { z3.n = 3; }
|
||
|
|
// Not OK: z3 is not in its lifetime when the initializer of z2 runs.
|
||
|
|
constexpr Y(int) : z2{
|
||
|
|
(z3.n = 1, // expected-note {{assignment to object outside its lifetime}}
|
||
|
|
z3.n + 1) // expected-warning {{uninitialized}}
|
||
|
|
} { z1.n = 3; }
|
||
|
|
constexpr Y(int, int) : z2{} {}
|
||
|
|
};
|
||
|
|
// FIXME: This is working around clang not implementing DR2026. With that
|
||
|
|
// fixed, we should be able to test this without the injected copy.
|
||
|
|
constexpr Y copy(Y y) { return y; } // expected-note {{in call to 'Y(y)'}} expected-note {{subobject of type 'int' is not initialized}}
|
||
|
|
constexpr Y y1 = copy(Y());
|
||
|
|
static_assert(y1.z1.n == 1 && y1.z2.n == 2 && y1.z3.n == 3);
|
||
|
|
|
||
|
|
constexpr Y y2 = copy(Y(0)); // expected-error {{constant expression}} expected-note {{in call}}
|
||
|
|
|
||
|
|
static_assert(Y(0,0).z2.n == 0);
|
||
|
|
static_assert(Y(0,0).z1.n == 0); // expected-error {{constant expression}} expected-note {{read of uninitialized object}}
|
||
|
|
static_assert(Y(0,0).z3.n == 0); // expected-error {{constant expression}} expected-note {{read of uninitialized object}}
|
||
|
|
|
||
|
|
static_assert(copy(Y(0,0)).z2.n == 0); // expected-error {{constant expression}} expected-note {{in call}}
|
||
|
|
|
||
|
|
constexpr unsigned char not_even_unsigned_char() {
|
||
|
|
unsigned char c;
|
||
|
|
return c; // expected-note {{read of uninitialized object}}
|
||
|
|
}
|
||
|
|
constexpr unsigned char x = not_even_unsigned_char(); // expected-error {{constant expression}} expected-note {{in call}}
|
||
|
|
|
||
|
|
constexpr int switch_var(int n) {
|
||
|
|
switch (n) {
|
||
|
|
case 1:
|
||
|
|
int a;
|
||
|
|
a = n;
|
||
|
|
return a;
|
||
|
|
|
||
|
|
case 2:
|
||
|
|
a = n;
|
||
|
|
return a;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
constexpr int s1 = switch_var(1);
|
||
|
|
constexpr int s2 = switch_var(2);
|
||
|
|
static_assert(s1 == 1 && s2 == 2);
|
||
|
|
|
||
|
|
constexpr bool switch_into_init_stmt() {
|
||
|
|
switch (1) {
|
||
|
|
if (int n; false) {
|
||
|
|
for (int m; false;) {
|
||
|
|
case 1:
|
||
|
|
n = m = 1;
|
||
|
|
return n == 1 && m == 1;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
static_assert(switch_into_init_stmt());
|
||
|
|
}
|
||
|
|
|
||
|
|
namespace dtor {
|
||
|
|
void lifetime_extension() {
|
||
|
|
struct X { constexpr ~X() {} };
|
||
|
|
X &&a = X();
|
||
|
|
}
|
||
|
|
|
||
|
|
template<typename T> constexpr T &&ref(T &&t) { return (T&&)t; }
|
||
|
|
|
||
|
|
struct Buf {
|
||
|
|
char buf[64];
|
||
|
|
int n = 0;
|
||
|
|
constexpr void operator+=(char c) { buf[n++] = c; }
|
||
|
|
constexpr bool operator==(const char *str) const {
|
||
|
|
return str[n] == 0 && __builtin_memcmp(str, buf, n) == 0;
|
||
|
|
}
|
||
|
|
constexpr bool operator!=(const char *str) const { return !operator==(str); }
|
||
|
|
};
|
||
|
|
|
||
|
|
struct A {
|
||
|
|
constexpr A(Buf &buf, char c) : buf(buf), c(c) { buf += c; }
|
||
|
|
constexpr ~A() { buf += c; }
|
||
|
|
constexpr operator bool() const { return true; }
|
||
|
|
Buf &buf;
|
||
|
|
char c;
|
||
|
|
};
|
||
|
|
|
||
|
|
constexpr bool dtor_calls_dtor() {
|
||
|
|
union U {
|
||
|
|
constexpr U(Buf &buf) : u(buf, 'u') { buf += 'U'; }
|
||
|
|
constexpr ~U() { u.buf += 'U'; }
|
||
|
|
A u, v;
|
||
|
|
};
|
||
|
|
|
||
|
|
struct B : A {
|
||
|
|
A c, &&d, e;
|
||
|
|
union {
|
||
|
|
A f;
|
||
|
|
};
|
||
|
|
U u;
|
||
|
|
constexpr B(Buf &buf)
|
||
|
|
: A(buf, 'a'), c(buf, 'c'), d(ref(A(buf, 'd'))), e(A(buf, 'e')), f(buf, 'f'), u(buf) {
|
||
|
|
buf += 'b';
|
||
|
|
}
|
||
|
|
constexpr ~B() {
|
||
|
|
buf += 'b';
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
Buf buf;
|
||
|
|
{
|
||
|
|
B b(buf);
|
||
|
|
if (buf != "acddefuUb")
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
if (buf != "acddefuUbbUeca")
|
||
|
|
return false;
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
static_assert(dtor_calls_dtor());
|
||
|
|
|
||
|
|
constexpr void abnormal_termination(Buf &buf) {
|
||
|
|
struct Indestructible {
|
||
|
|
constexpr ~Indestructible(); // not defined
|
||
|
|
};
|
||
|
|
|
||
|
|
A a(buf, 'a');
|
||
|
|
A(buf, 'b');
|
||
|
|
int n = 0;
|
||
|
|
for (A &&c = A(buf, 'c'); A d = A(buf, 'd'); A(buf, 'e')) {
|
||
|
|
switch (A f(buf, 'f'); A g = A(buf, 'g')) { // expected-warning {{boolean}}
|
||
|
|
case false: {
|
||
|
|
A x(buf, 'x');
|
||
|
|
}
|
||
|
|
|
||
|
|
case true: {
|
||
|
|
A h(buf, 'h');
|
||
|
|
switch (n++) {
|
||
|
|
case 0:
|
||
|
|
break;
|
||
|
|
case 1:
|
||
|
|
continue;
|
||
|
|
case 2:
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
default:
|
||
|
|
Indestructible indest;
|
||
|
|
}
|
||
|
|
|
||
|
|
A j = (A(buf, 'i'), A(buf, 'j'));
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
constexpr bool check_abnormal_termination() {
|
||
|
|
Buf buf = {};
|
||
|
|
abnormal_termination(buf);
|
||
|
|
return buf ==
|
||
|
|
"abbc"
|
||
|
|
"dfgh" /*break*/ "hgfijijeed"
|
||
|
|
"dfgh" /*continue*/ "hgfeed"
|
||
|
|
"dfgh" /*return*/ "hgfd"
|
||
|
|
"ca";
|
||
|
|
}
|
||
|
|
static_assert(check_abnormal_termination());
|
||
|
|
|
||
|
|
constexpr bool run_dtors_on_array_filler() {
|
||
|
|
struct S {
|
||
|
|
int times_destroyed = 0;
|
||
|
|
constexpr ~S() { if (++times_destroyed != 1) throw "oops"; }
|
||
|
|
};
|
||
|
|
S s[3];
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
static_assert(run_dtors_on_array_filler());
|
||
|
|
|
||
|
|
// Ensure that we can handle temporary cleanups for array temporaries.
|
||
|
|
struct ArrElem { constexpr ~ArrElem() {} };
|
||
|
|
using Arr = ArrElem[3];
|
||
|
|
static_assert((Arr{}, true));
|
||
|
|
}
|
||
|
|
|
||
|
|
namespace dynamic_alloc {
|
||
|
|
constexpr int *p = // expected-error {{constant}} expected-note {{pointer to heap-allocated object is not a constant expression}}
|
||
|
|
new int; // expected-note {{heap allocation performed here}}
|
||
|
|
|
||
|
|
constexpr int f(int n) {
|
||
|
|
int *p = new int[n];
|
||
|
|
for (int i = 0; i != n; ++i) {
|
||
|
|
p[i] = i;
|
||
|
|
}
|
||
|
|
int k = 0;
|
||
|
|
for (int i = 0; i != n; ++i) {
|
||
|
|
k += p[i];
|
||
|
|
}
|
||
|
|
delete[] p;
|
||
|
|
return k;
|
||
|
|
}
|
||
|
|
static_assert(f(123) == 123 * 122 / 2);
|
||
|
|
|
||
|
|
constexpr bool nvdtor() { // expected-error {{never produces a constant expression}}
|
||
|
|
struct S {
|
||
|
|
constexpr ~S() {}
|
||
|
|
};
|
||
|
|
struct T : S {};
|
||
|
|
delete (S*)new T; // expected-note {{delete of object with dynamic type 'T' through pointer to base class type 'S' with non-virtual destructor}}
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
constexpr int vdtor_1() {
|
||
|
|
int a;
|
||
|
|
struct S {
|
||
|
|
constexpr S(int *p) : p(p) {}
|
||
|
|
constexpr virtual ~S() { *p = 1; }
|
||
|
|
int *p;
|
||
|
|
};
|
||
|
|
struct T : S {
|
||
|
|
// implicit destructor defined eagerly because it is constexpr and virtual
|
||
|
|
using S::S;
|
||
|
|
};
|
||
|
|
delete (S*)new T(&a);
|
||
|
|
return a;
|
||
|
|
}
|
||
|
|
static_assert(vdtor_1() == 1);
|
||
|
|
|
||
|
|
constexpr int vdtor_2() {
|
||
|
|
int a = 0;
|
||
|
|
struct S { constexpr virtual ~S() {} };
|
||
|
|
struct T : S {
|
||
|
|
constexpr T(int *p) : p(p) {}
|
||
|
|
constexpr ~T() { ++*p; }
|
||
|
|
int *p;
|
||
|
|
};
|
||
|
|
S *p = new T{&a};
|
||
|
|
delete p;
|
||
|
|
return a;
|
||
|
|
}
|
||
|
|
static_assert(vdtor_2() == 1);
|
||
|
|
|
||
|
|
constexpr int vdtor_3(int mode) {
|
||
|
|
int a = 0;
|
||
|
|
struct S { constexpr virtual ~S() {} };
|
||
|
|
struct T : S {
|
||
|
|
constexpr T(int *p) : p(p) {}
|
||
|
|
constexpr ~T() { ++*p; }
|
||
|
|
int *p;
|
||
|
|
};
|
||
|
|
S *p = new T[3]{&a, &a, &a}; // expected-note 2{{heap allocation}}
|
||
|
|
switch (mode) {
|
||
|
|
case 0:
|
||
|
|
delete p; // expected-note {{non-array delete used to delete pointer to array object of type 'T [3]'}}
|
||
|
|
break;
|
||
|
|
case 1:
|
||
|
|
// FIXME: This diagnosic isn't great; we should mention the cast to S*
|
||
|
|
// somewhere in here.
|
||
|
|
delete[] p; // expected-note {{delete of pointer to subobject '&{*new T [3]#0}[0]'}}
|
||
|
|
break;
|
||
|
|
case 2:
|
||
|
|
delete (T*)p; // expected-note {{non-array delete used to delete pointer to array object of type 'T [3]'}}
|
||
|
|
break;
|
||
|
|
case 3:
|
||
|
|
delete[] (T*)p;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
return a;
|
||
|
|
}
|
||
|
|
static_assert(vdtor_3(0) == 3); // expected-error {{}} expected-note {{in call}}
|
||
|
|
static_assert(vdtor_3(1) == 3); // expected-error {{}} expected-note {{in call}}
|
||
|
|
static_assert(vdtor_3(2) == 3); // expected-error {{}} expected-note {{in call}}
|
||
|
|
static_assert(vdtor_3(3) == 3);
|
||
|
|
|
||
|
|
constexpr void delete_mismatch() { // expected-error {{never produces a constant expression}}
|
||
|
|
delete[] // expected-note {{array delete used to delete pointer to non-array object of type 'int'}}
|
||
|
|
new int; // expected-note {{allocation}}
|
||
|
|
}
|
||
|
|
|
||
|
|
template<typename T>
|
||
|
|
constexpr T dynarray(int elems, int i) {
|
||
|
|
T *p;
|
||
|
|
if constexpr (sizeof(T) == 1)
|
||
|
|
p = new T[elems]{"fox"}; // expected-note {{evaluated array bound 3 is too small to hold 4 explicitly initialized elements}}
|
||
|
|
else
|
||
|
|
p = new T[elems]{1, 2, 3}; // expected-note {{evaluated array bound 2 is too small to hold 3 explicitly initialized elements}}
|
||
|
|
T n = p[i]; // expected-note 4{{past-the-end}}
|
||
|
|
delete [] p;
|
||
|
|
return n;
|
||
|
|
}
|
||
|
|
static_assert(dynarray<int>(4, 0) == 1);
|
||
|
|
static_assert(dynarray<int>(4, 1) == 2);
|
||
|
|
static_assert(dynarray<int>(4, 2) == 3);
|
||
|
|
static_assert(dynarray<int>(4, 3) == 0);
|
||
|
|
static_assert(dynarray<int>(4, 4) == 0); // expected-error {{constant expression}} expected-note {{in call}}
|
||
|
|
static_assert(dynarray<int>(3, 2) == 3);
|
||
|
|
static_assert(dynarray<int>(3, 3) == 0); // expected-error {{constant expression}} expected-note {{in call}}
|
||
|
|
static_assert(dynarray<int>(2, 1) == 0); // expected-error {{constant expression}} expected-note {{in call}}
|
||
|
|
static_assert(dynarray<char>(5, 0) == 'f');
|
||
|
|
static_assert(dynarray<char>(5, 1) == 'o');
|
||
|
|
static_assert(dynarray<char>(5, 2) == 'x');
|
||
|
|
static_assert(dynarray<char>(5, 3) == 0); // (from string)
|
||
|
|
static_assert(dynarray<char>(5, 4) == 0); // (from filler)
|
||
|
|
static_assert(dynarray<char>(5, 5) == 0); // expected-error {{constant expression}} expected-note {{in call}}
|
||
|
|
static_assert(dynarray<char>(4, 0) == 'f');
|
||
|
|
static_assert(dynarray<char>(4, 1) == 'o');
|
||
|
|
static_assert(dynarray<char>(4, 2) == 'x');
|
||
|
|
static_assert(dynarray<char>(4, 3) == 0);
|
||
|
|
static_assert(dynarray<char>(4, 4) == 0); // expected-error {{constant expression}} expected-note {{in call}}
|
||
|
|
static_assert(dynarray<char>(3, 2) == 'x'); // expected-error {{constant expression}} expected-note {{in call}}
|
||
|
|
|
||
|
|
constexpr bool run_dtors_on_array_filler() {
|
||
|
|
struct S {
|
||
|
|
int times_destroyed = 0;
|
||
|
|
constexpr ~S() { if (++times_destroyed != 1) throw "oops"; }
|
||
|
|
};
|
||
|
|
delete[] new S[3];
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
static_assert(run_dtors_on_array_filler());
|
||
|
|
|
||
|
|
constexpr bool erroneous_array_bound(long long n) {
|
||
|
|
delete[] new int[n]; // expected-note {{array bound -1 is negative}} expected-note {{array bound 4611686018427387904 is too large}}
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
static_assert(erroneous_array_bound(3));
|
||
|
|
static_assert(erroneous_array_bound(0));
|
||
|
|
static_assert(erroneous_array_bound(-1)); // expected-error {{constant expression}} expected-note {{in call}}
|
||
|
|
static_assert(erroneous_array_bound(1LL << 62)); // expected-error {{constant expression}} expected-note {{in call}}
|
||
|
|
|
||
|
|
constexpr bool erroneous_array_bound_nothrow(long long n) {
|
||
|
|
int *p = new (std::nothrow) int[n];
|
||
|
|
bool result = p != 0;
|
||
|
|
delete[] p;
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
static_assert(erroneous_array_bound_nothrow(3));
|
||
|
|
static_assert(erroneous_array_bound_nothrow(0));
|
||
|
|
static_assert(!erroneous_array_bound_nothrow(-1));
|
||
|
|
static_assert(!erroneous_array_bound_nothrow(1LL << 62));
|
||
|
|
|
||
|
|
constexpr bool evaluate_nothrow_arg() {
|
||
|
|
bool ok = false;
|
||
|
|
delete new ((ok = true, std::nothrow)) int;
|
||
|
|
return ok;
|
||
|
|
}
|
||
|
|
static_assert(evaluate_nothrow_arg());
|
||
|
|
|
||
|
|
constexpr void double_delete() { // expected-error {{never produces a constant expression}}
|
||
|
|
int *p = new int;
|
||
|
|
delete p;
|
||
|
|
delete p; // expected-note {{delete of pointer that has already been deleted}}
|
||
|
|
}
|
||
|
|
constexpr bool super_secret_double_delete() {
|
||
|
|
struct A {
|
||
|
|
constexpr ~A() { delete this; } // expected-note {{destruction of object that is already being destroyed}} expected-note {{in call}}
|
||
|
|
};
|
||
|
|
delete new A; // expected-note {{in call}}
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
static_assert(super_secret_double_delete()); // expected-error {{constant expression}} expected-note {{in call}}
|
||
|
|
|
||
|
|
constexpr void use_after_free() { // expected-error {{never produces a constant expression}}
|
||
|
|
int *p = new int;
|
||
|
|
delete p;
|
||
|
|
*p = 1; // expected-note {{assignment to heap allocated object that has been deleted}}
|
||
|
|
}
|
||
|
|
constexpr void use_after_free_2() { // expected-error {{never produces a constant expression}}
|
||
|
|
struct X { constexpr void f() {} };
|
||
|
|
X *p = new X;
|
||
|
|
delete p;
|
||
|
|
p->f(); // expected-note {{member call on heap allocated object that has been deleted}}
|
||
|
|
}
|
||
|
|
|
||
|
|
template<typename T> struct X {
|
||
|
|
std::size_t n;
|
||
|
|
char *p;
|
||
|
|
void dependent();
|
||
|
|
};
|
||
|
|
template<typename T> void X<T>::dependent() {
|
||
|
|
char *p;
|
||
|
|
// Ensure that we don't try to evaluate these for overflow and crash. These
|
||
|
|
// are all value-dependent expressions.
|
||
|
|
p = new char[n];
|
||
|
|
p = new ((std::align_val_t)n) char[n];
|
||
|
|
p = new char(n);
|
||
|
|
}
|
||
|
|
|
||
|
|
namespace PR47143 {
|
||
|
|
constexpr char *f(int n) {
|
||
|
|
return new char[n]();
|
||
|
|
}
|
||
|
|
const char *p = f(3);
|
||
|
|
constexpr bool test() {
|
||
|
|
char *p = f(3);
|
||
|
|
bool result = !p[0] && !p[1] && !p[2];
|
||
|
|
delete [] p;
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
static_assert(test());
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
struct placement_new_arg {};
|
||
|
|
void *operator new(std::size_t, placement_new_arg);
|
||
|
|
void operator delete(void*, placement_new_arg);
|
||
|
|
|
||
|
|
namespace placement_new_delete {
|
||
|
|
struct ClassSpecificNew {
|
||
|
|
void *operator new(std::size_t);
|
||
|
|
};
|
||
|
|
struct ClassSpecificDelete {
|
||
|
|
void operator delete(void*);
|
||
|
|
};
|
||
|
|
struct DestroyingDelete {
|
||
|
|
void operator delete(DestroyingDelete*, std::destroying_delete_t);
|
||
|
|
};
|
||
|
|
struct alignas(64) Overaligned {};
|
||
|
|
|
||
|
|
constexpr bool ok() {
|
||
|
|
delete new Overaligned;
|
||
|
|
delete ::new ClassSpecificNew;
|
||
|
|
::delete new ClassSpecificDelete;
|
||
|
|
::delete new DestroyingDelete;
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
static_assert(ok());
|
||
|
|
|
||
|
|
constexpr bool bad(int which) {
|
||
|
|
switch (which) {
|
||
|
|
case 0:
|
||
|
|
delete new (placement_new_arg{}) int; // expected-note {{call to placement 'operator new'}}
|
||
|
|
break;
|
||
|
|
|
||
|
|
case 1:
|
||
|
|
delete new ClassSpecificNew; // expected-note {{call to class-specific 'operator new'}}
|
||
|
|
break;
|
||
|
|
|
||
|
|
case 2:
|
||
|
|
delete new ClassSpecificDelete; // expected-note {{call to class-specific 'operator delete'}}
|
||
|
|
break;
|
||
|
|
|
||
|
|
case 3:
|
||
|
|
delete new DestroyingDelete; // expected-note {{call to class-specific 'operator delete'}}
|
||
|
|
break;
|
||
|
|
|
||
|
|
case 4:
|
||
|
|
// FIXME: This technically follows the standard's rules, but it seems
|
||
|
|
// unreasonable to expect implementations to support this.
|
||
|
|
delete new (std::align_val_t{64}) Overaligned; // expected-note {{placement new expression is not yet supported}}
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
static_assert(bad(0)); // expected-error {{constant expression}} expected-note {{in call}}
|
||
|
|
static_assert(bad(1)); // expected-error {{constant expression}} expected-note {{in call}}
|
||
|
|
static_assert(bad(2)); // expected-error {{constant expression}} expected-note {{in call}}
|
||
|
|
static_assert(bad(3)); // expected-error {{constant expression}} expected-note {{in call}}
|
||
|
|
static_assert(bad(4)); // expected-error {{constant expression}} expected-note {{in call}}
|
||
|
|
}
|
||
|
|
|
||
|
|
namespace delete_random_things {
|
||
|
|
static_assert((delete new int, true));
|
||
|
|
static_assert((delete (int*)0, true));
|
||
|
|
int n; // expected-note {{declared here}}
|
||
|
|
static_assert((delete &n, true)); // expected-error {{}} expected-note {{delete of pointer '&n' that does not point to a heap-allocated object}}
|
||
|
|
struct A { int n; };
|
||
|
|
static_assert((delete &(new A)->n, true)); // expected-error {{}} expected-note {{delete of pointer to subobject '&{*new delete_random_things::A#0}.n'}}
|
||
|
|
static_assert((delete (new int + 1), true)); // expected-error {{}} expected-note {{delete of pointer '&{*new int#0} + 1' that does not point to complete object}}
|
||
|
|
static_assert((delete[] (new int[3] + 1), true)); // expected-error {{}} expected-note {{delete of pointer to subobject '&{*new int [3]#0}[1]'}}
|
||
|
|
static_assert((delete &(int&)(int&&)0, true)); // expected-error {{}} expected-note {{delete of pointer '&0' that does not point to a heap-allocated object}} expected-note {{temporary created here}}
|
||
|
|
}
|
||
|
|
|
||
|
|
namespace value_dependent_delete {
|
||
|
|
template<typename T> void f(T *p) {
|
||
|
|
int arr[(delete p, 0)];
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
namespace memory_leaks {
|
||
|
|
static_assert(*new bool(true)); // expected-error {{}} expected-note {{allocation performed here was not deallocated}}
|
||
|
|
|
||
|
|
constexpr bool *f() { return new bool(true); } // expected-note {{allocation performed here was not deallocated}}
|
||
|
|
static_assert(*f()); // expected-error {{}}
|
||
|
|
|
||
|
|
struct UP {
|
||
|
|
bool *p;
|
||
|
|
constexpr ~UP() { delete p; }
|
||
|
|
constexpr bool &operator*() { return *p; }
|
||
|
|
};
|
||
|
|
constexpr UP g() { return {new bool(true)}; }
|
||
|
|
static_assert(*g()); // ok
|
||
|
|
|
||
|
|
constexpr bool h(UP p) { return *p; }
|
||
|
|
static_assert(h({new bool(true)})); // ok
|
||
|
|
}
|
||
|
|
|
||
|
|
constexpr void *operator new(std::size_t, void *p) { return p; }
|
||
|
|
namespace std {
|
||
|
|
template<typename T> constexpr T *construct(T *p) { return new (p) T; }
|
||
|
|
template<typename T> constexpr void destroy(T *p) { p->~T(); }
|
||
|
|
}
|
||
|
|
|
||
|
|
namespace dtor_call {
|
||
|
|
struct A { int n; };
|
||
|
|
constexpr void f() { // expected-error {{never produces a constant expression}}
|
||
|
|
A a; // expected-note {{destroying object 'a' whose lifetime has already ended}}
|
||
|
|
a.~A();
|
||
|
|
}
|
||
|
|
union U { A a; };
|
||
|
|
constexpr void g() {
|
||
|
|
U u;
|
||
|
|
u.a.n = 3;
|
||
|
|
u.a.~A();
|
||
|
|
// There's now effectively no active union member, but we model it as if
|
||
|
|
// 'a' is still the active union member (but its lifetime has ended).
|
||
|
|
u.a.n = 4; // Start lifetime of 'a' again.
|
||
|
|
u.a.~A();
|
||
|
|
}
|
||
|
|
static_assert((g(), true));
|
||
|
|
|
||
|
|
constexpr bool pseudo(bool read, bool recreate) {
|
||
|
|
using T = bool;
|
||
|
|
bool b = false; // expected-note {{lifetime has already ended}}
|
||
|
|
// This evaluates the store to 'b'...
|
||
|
|
(b = true).~T();
|
||
|
|
// ... and ends the lifetime of the object.
|
||
|
|
return (read
|
||
|
|
? b // expected-note {{read of object outside its lifetime}}
|
||
|
|
: true) +
|
||
|
|
(recreate
|
||
|
|
? (std::construct(&b), true)
|
||
|
|
: true);
|
||
|
|
}
|
||
|
|
static_assert(pseudo(false, false)); // expected-error {{constant expression}} expected-note {{in call}}
|
||
|
|
static_assert(pseudo(true, false)); // expected-error {{constant expression}} expected-note {{in call}}
|
||
|
|
static_assert(pseudo(false, true));
|
||
|
|
|
||
|
|
constexpr void use_after_destroy() {
|
||
|
|
A a;
|
||
|
|
a.~A();
|
||
|
|
A b = a; // expected-note {{in call}} expected-note {{read of object outside its lifetime}}
|
||
|
|
}
|
||
|
|
static_assert((use_after_destroy(), true)); // expected-error {{}} expected-note {{in call}}
|
||
|
|
|
||
|
|
constexpr void double_destroy() {
|
||
|
|
A a;
|
||
|
|
a.~A();
|
||
|
|
a.~A(); // expected-note {{destruction of object outside its lifetime}}
|
||
|
|
}
|
||
|
|
static_assert((double_destroy(), true)); // expected-error {{}} expected-note {{in call}}
|
||
|
|
|
||
|
|
struct X { char *p; constexpr ~X() { *p++ = 'X'; } };
|
||
|
|
struct Y : X { int y; virtual constexpr ~Y() { *p++ = 'Y'; } };
|
||
|
|
struct Z : Y { int z; constexpr ~Z() override { *p++ = 'Z'; } };
|
||
|
|
union VU {
|
||
|
|
constexpr VU() : z() {}
|
||
|
|
constexpr ~VU() {}
|
||
|
|
Z z;
|
||
|
|
};
|
||
|
|
|
||
|
|
constexpr bool virt_dtor(int mode, const char *expected) {
|
||
|
|
char buff[4] = {};
|
||
|
|
VU vu;
|
||
|
|
vu.z.p = buff;
|
||
|
|
switch (mode) {
|
||
|
|
case 0:
|
||
|
|
vu.z.~Z();
|
||
|
|
break;
|
||
|
|
case 1:
|
||
|
|
((Y&)vu.z).~Y();
|
||
|
|
break;
|
||
|
|
case 2:
|
||
|
|
((X&)vu.z).~X();
|
||
|
|
break;
|
||
|
|
case 3:
|
||
|
|
((Y&)vu.z).Y::~Y();
|
||
|
|
vu.z.z = 1; // ok, still have a Z (with no Y base class!)
|
||
|
|
break;
|
||
|
|
case 4:
|
||
|
|
((X&)vu.z).X::~X();
|
||
|
|
vu.z.y = 1; // ok, still have a Z and a Y (with no X base class!)
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
return __builtin_strcmp(expected, buff) == 0;
|
||
|
|
}
|
||
|
|
static_assert(virt_dtor(0, "ZYX"));
|
||
|
|
static_assert(virt_dtor(1, "ZYX"));
|
||
|
|
static_assert(virt_dtor(2, "X"));
|
||
|
|
static_assert(virt_dtor(3, "YX"));
|
||
|
|
static_assert(virt_dtor(4, "X"));
|
||
|
|
|
||
|
|
constexpr bool virt_delete(bool global) {
|
||
|
|
struct A {
|
||
|
|
virtual constexpr ~A() {}
|
||
|
|
};
|
||
|
|
struct B : A {
|
||
|
|
void operator delete(void *);
|
||
|
|
constexpr ~B() {}
|
||
|
|
};
|
||
|
|
|
||
|
|
A *p = new B;
|
||
|
|
if (global)
|
||
|
|
::delete p;
|
||
|
|
else
|
||
|
|
delete p; // expected-note {{call to class-specific 'operator delete'}}
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
static_assert(virt_delete(true));
|
||
|
|
static_assert(virt_delete(false)); // expected-error {{}} expected-note {{in call}}
|
||
|
|
|
||
|
|
constexpr void use_after_virt_destroy() {
|
||
|
|
char buff[4] = {};
|
||
|
|
VU vu;
|
||
|
|
vu.z.p = buff;
|
||
|
|
((Y&)vu.z).~Y();
|
||
|
|
((Z&)vu.z).z = 1; // expected-note {{assignment to object outside its lifetime}}
|
||
|
|
}
|
||
|
|
static_assert((use_after_virt_destroy(), true)); // expected-error {{}} expected-note {{in call}}
|
||
|
|
|
||
|
|
constexpr void destroy_after_lifetime() {
|
||
|
|
A *p;
|
||
|
|
{
|
||
|
|
A a;
|
||
|
|
p = &a;
|
||
|
|
}
|
||
|
|
p->~A(); // expected-note {{destruction of object outside its lifetime}}
|
||
|
|
}
|
||
|
|
static_assert((destroy_after_lifetime(), true)); // expected-error {{}} expected-note {{in call}}
|
||
|
|
|
||
|
|
constexpr void destroy_after_lifetime2() {
|
||
|
|
A *p = []{ A a; return &a; }(); // expected-warning {{}} expected-note {{declared here}}
|
||
|
|
p->~A(); // expected-note {{destruction of variable whose lifetime has ended}}
|
||
|
|
}
|
||
|
|
static_assert((destroy_after_lifetime2(), true)); // expected-error {{}} expected-note {{in call}}
|
||
|
|
|
||
|
|
constexpr void destroy_after_lifetime3() {
|
||
|
|
A *p = []{ return &(A&)(A&&)A(); }(); // expected-warning {{}} expected-note {{temporary created here}}
|
||
|
|
p->~A(); // expected-note {{destruction of temporary whose lifetime has ended}}
|
||
|
|
}
|
||
|
|
static_assert((destroy_after_lifetime3(), true)); // expected-error {{}} expected-note {{in call}}
|
||
|
|
|
||
|
|
constexpr void destroy_after_lifetime4() { // expected-error {{never produces a constant expression}}
|
||
|
|
A *p = new A;
|
||
|
|
delete p;
|
||
|
|
p->~A(); // expected-note {{destruction of heap allocated object that has been deleted}}
|
||
|
|
}
|
||
|
|
|
||
|
|
struct Extern { constexpr ~Extern() {} } extern e;
|
||
|
|
constexpr void destroy_extern() { // expected-error {{never produces a constant expression}}
|
||
|
|
e.~Extern(); // expected-note {{cannot modify an object that is visible outside}}
|
||
|
|
}
|
||
|
|
|
||
|
|
constexpr A &&a_ref = A(); // expected-note {{temporary created here}}
|
||
|
|
constexpr void destroy_extern_2() { // expected-error {{never produces a constant expression}}
|
||
|
|
a_ref.~A(); // expected-note {{destruction of temporary is not allowed in a constant expression outside the expression that created the temporary}}
|
||
|
|
}
|
||
|
|
|
||
|
|
struct S {
|
||
|
|
constexpr S() { n = 1; }
|
||
|
|
constexpr ~S() { n = 0; }
|
||
|
|
int n;
|
||
|
|
};
|
||
|
|
constexpr void destroy_volatile() {
|
||
|
|
volatile S s;
|
||
|
|
}
|
||
|
|
static_assert((destroy_volatile(), true)); // ok, not volatile during construction and destruction
|
||
|
|
|
||
|
|
constexpr void destroy_null() { // expected-error {{never produces a constant expression}}
|
||
|
|
((A*)nullptr)->~A(); // expected-note {{destruction of dereferenced null pointer}}
|
||
|
|
}
|
||
|
|
|
||
|
|
constexpr void destroy_past_end() { // expected-error {{never produces a constant expression}}
|
||
|
|
A a;
|
||
|
|
(&a+1)->~A(); // expected-note {{destruction of dereferenced one-past-the-end pointer}}
|
||
|
|
}
|
||
|
|
|
||
|
|
constexpr void destroy_past_end_array() { // expected-error {{never produces a constant expression}}
|
||
|
|
A a[2];
|
||
|
|
a[2].~A(); // expected-note {{destruction of dereferenced one-past-the-end pointer}}
|
||
|
|
}
|
||
|
|
|
||
|
|
union As {
|
||
|
|
A a, b;
|
||
|
|
};
|
||
|
|
|
||
|
|
constexpr void destroy_no_active() { // expected-error {{never produces a constant expression}}
|
||
|
|
As as;
|
||
|
|
as.b.~A(); // expected-note {{destruction of member 'b' of union with no active member}}
|
||
|
|
}
|
||
|
|
|
||
|
|
constexpr void destroy_inactive() { // expected-error {{never produces a constant expression}}
|
||
|
|
As as;
|
||
|
|
as.a.n = 1;
|
||
|
|
as.b.~A(); // expected-note {{destruction of member 'b' of union with active member 'a'}}
|
||
|
|
}
|
||
|
|
|
||
|
|
constexpr void destroy_no_active_2() { // expected-error {{never produces a constant expression}}
|
||
|
|
As as;
|
||
|
|
as.a.n = 1;
|
||
|
|
as.a.~A();
|
||
|
|
// FIXME: This diagnostic is wrong; the union has no active member now.
|
||
|
|
as.b.~A(); // expected-note {{destruction of member 'b' of union with active member 'a'}}
|
||
|
|
}
|
||
|
|
|
||
|
|
constexpr void destroy_pointer() {
|
||
|
|
using T = int*;
|
||
|
|
T p;
|
||
|
|
// We used to think this was an -> member access because its left-hand side
|
||
|
|
// is a pointer. Ensure we don't crash.
|
||
|
|
p.~T();
|
||
|
|
// Put a T back so we can destroy it again.
|
||
|
|
std::construct(&p);
|
||
|
|
}
|
||
|
|
static_assert((destroy_pointer(), true));
|
||
|
|
}
|
||
|
|
|
||
|
|
namespace temp_dtor {
|
||
|
|
void f();
|
||
|
|
struct A {
|
||
|
|
bool b;
|
||
|
|
constexpr ~A() { if (b) f(); }
|
||
|
|
};
|
||
|
|
|
||
|
|
// We can't accept either of these unless we start actually registering the
|
||
|
|
// destructors of the A temporaries to run on shutdown. It's unclear what the
|
||
|
|
// intended standard behavior is so we reject this for now.
|
||
|
|
constexpr A &&a = A{false}; // expected-error {{constant}} expected-note {{non-trivial destruction of lifetime-extended temporary}}
|
||
|
|
void f() { a.b = true; }
|
||
|
|
|
||
|
|
constexpr A &&b = A{true}; // expected-error {{constant}} expected-note {{non-trivial destruction of lifetime-extended temporary}}
|
||
|
|
|
||
|
|
// FIXME: We could in prinicple accept this.
|
||
|
|
constexpr const A &c = A{false}; // expected-error {{constant}} expected-note {{non-trivial destruction of lifetime-extended temporary}}
|
||
|
|
}
|
||
|
|
|
||
|
|
namespace value_dependent_init {
|
||
|
|
struct A {
|
||
|
|
constexpr ~A() {}
|
||
|
|
};
|
||
|
|
template<typename T> void f() {
|
||
|
|
A a = T();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
namespace mutable_subobjects {
|
||
|
|
struct A {
|
||
|
|
int m;
|
||
|
|
mutable int n; // expected-note 2{{here}}
|
||
|
|
constexpr int f() const { return m; }
|
||
|
|
constexpr int g() const { return n; } // expected-note {{mutable}}
|
||
|
|
};
|
||
|
|
|
||
|
|
constexpr A a = {1, 2};
|
||
|
|
static_assert(a.f() == 1); // OK (PR44958)
|
||
|
|
static_assert(a.g() == 2); // expected-error {{constant}} expected-note {{in call}}
|
||
|
|
|
||
|
|
constexpr A b = a; // expected-error {{constant}} expected-note {{read of mutable member 'n'}} expected-note {{in call}}
|
||
|
|
|
||
|
|
auto &ti1 = typeid(a);
|
||
|
|
auto &ti2 = typeid(a.m);
|
||
|
|
auto &ti3 = typeid(a.n);
|
||
|
|
|
||
|
|
constexpr void destroy1() { // expected-error {{constexpr}}
|
||
|
|
a.~A(); // expected-note {{cannot modify an object that is visible outside}}
|
||
|
|
}
|
||
|
|
using T = int;
|
||
|
|
constexpr void destroy2() { // expected-error {{constexpr}}
|
||
|
|
a.m.~T(); // expected-note {{cannot modify an object that is visible outside}}
|
||
|
|
}
|
||
|
|
constexpr void destroy3() { // expected-error {{constexpr}}
|
||
|
|
a.n.~T(); // expected-note {{cannot modify an object that is visible outside}}
|
||
|
|
}
|
||
|
|
|
||
|
|
struct X {
|
||
|
|
mutable int n = 0;
|
||
|
|
virtual constexpr ~X() {}
|
||
|
|
};
|
||
|
|
struct Y : X {
|
||
|
|
};
|
||
|
|
constexpr Y y;
|
||
|
|
constexpr const X *p = &y;
|
||
|
|
constexpr const Y *q = dynamic_cast<const Y*>(p);
|
||
|
|
|
||
|
|
// FIXME: It's unclear whether this should be accepted. The dynamic_cast is
|
||
|
|
// undefined after 'z.y.~Y()`, for example. We essentially assume that all
|
||
|
|
// objects that the evaluator can reach have unbounded lifetimes. (We make
|
||
|
|
// the same assumption when evaluating member function calls.)
|
||
|
|
struct Z {
|
||
|
|
mutable Y y;
|
||
|
|
};
|
||
|
|
constexpr Z z;
|
||
|
|
constexpr const X *pz = &z.y;
|
||
|
|
constexpr const Y *qz = dynamic_cast<const Y*>(pz);
|
||
|
|
auto &zti = typeid(z.y);
|
||
|
|
static_assert(&zti == &typeid(Y));
|
||
|
|
}
|
||
|
|
|
||
|
|
namespace PR45133 {
|
||
|
|
struct A { long x; };
|
||
|
|
|
||
|
|
union U;
|
||
|
|
constexpr A foo(U *up);
|
||
|
|
|
||
|
|
union U {
|
||
|
|
A a = foo(this); // expected-note {{in call to 'foo(&u)'}}
|
||
|
|
int y;
|
||
|
|
};
|
||
|
|
|
||
|
|
constexpr A foo(U *up) {
|
||
|
|
up->y = 11; // expected-note {{assignment would change active union member during the initialization of a different member}}
|
||
|
|
return {42};
|
||
|
|
}
|
||
|
|
|
||
|
|
constinit U u = {}; // expected-error {{constant init}} expected-note {{constinit}}
|
||
|
|
|
||
|
|
template<int> struct X {};
|
||
|
|
|
||
|
|
union V {
|
||
|
|
int a, b;
|
||
|
|
constexpr V(X<0>) : a(a = 1) {} // ok
|
||
|
|
constexpr V(X<1>) : a(b = 1) {} // expected-note {{assignment would change active union member during the initialization of a different member}}
|
||
|
|
constexpr V(X<2>) : a() { b = 1; } // ok
|
||
|
|
// This case (changing the active member then changing it back) is debatable,
|
||
|
|
// but it seems appropriate to reject.
|
||
|
|
constexpr V(X<3>) : a((b = 1, a = 1)) {} // expected-note {{assignment would change active union member during the initialization of a different member}}
|
||
|
|
};
|
||
|
|
constinit V v0 = X<0>();
|
||
|
|
constinit V v1 = X<1>(); // expected-error {{constant init}} expected-note {{constinit}} expected-note {{in call}}
|
||
|
|
constinit V v2 = X<2>();
|
||
|
|
constinit V v3 = X<3>(); // expected-error {{constant init}} expected-note {{constinit}} expected-note {{in call}}
|
||
|
|
}
|
||
|
|
|
||
|
|
namespace PR45350 {
|
||
|
|
int q;
|
||
|
|
struct V { int n; int *p = &n; constexpr ~V() { *p = *p * 10 + n; }};
|
||
|
|
constexpr int f(int n) {
|
||
|
|
int k = 0;
|
||
|
|
V *p = new V[n];
|
||
|
|
for (int i = 0; i != n; ++i) {
|
||
|
|
if (p[i].p != &p[i].n) return -1;
|
||
|
|
p[i].n = i;
|
||
|
|
p[i].p = &k;
|
||
|
|
}
|
||
|
|
delete[] p;
|
||
|
|
return k;
|
||
|
|
}
|
||
|
|
// [expr.delete]p6:
|
||
|
|
// In the case of an array, the elements will be destroyed in order of
|
||
|
|
// decreasing address
|
||
|
|
static_assert(f(6) == 543210);
|
||
|
|
}
|
||
|
|
|
||
|
|
namespace PR47805 {
|
||
|
|
struct A {
|
||
|
|
bool bad = true;
|
||
|
|
constexpr ~A() { if (bad) throw; }
|
||
|
|
};
|
||
|
|
constexpr bool f(A a) { a.bad = false; return true; }
|
||
|
|
constexpr bool b = f(A());
|
||
|
|
|
||
|
|
struct B { B *p = this; };
|
||
|
|
constexpr bool g(B b) { return &b == b.p; }
|
||
|
|
static_assert(g({}));
|
||
|
|
}
|
||
|
|
|
||
|
|
constexpr bool destroy_at_test() {
|
||
|
|
int n = 0;
|
||
|
|
std::destroy(&n);
|
||
|
|
std::construct(&n);
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
static_assert(destroy_at_test());
|
||
|
|
|
||
|
|
namespace PR48582 {
|
||
|
|
struct S {
|
||
|
|
void *p = this;
|
||
|
|
constexpr S() {}
|
||
|
|
constexpr S(const S&) {}
|
||
|
|
};
|
||
|
|
constexpr bool b = [a = S(), b = S()] { return a.p == b.p; }();
|
||
|
|
static_assert(!b);
|
||
|
|
}
|