1 // RUN: %clang_cc1 -std=c++14 -verify -fexceptions -fcxx-exceptions %s
2 // RUN: %clang_cc1 -std=c++17 -verify -fexceptions -fcxx-exceptions %s -Wno-dynamic-exception-spec
3 // RUN: %clang_cc1 -std=c++14 -verify -fexceptions -fcxx-exceptions -Wno-c++1z-compat-mangling -DNO_COMPAT_MANGLING %s
4 // RUN: %clang_cc1 -std=c++14 -verify -fexceptions -fcxx-exceptions -Wno-noexcept-type -DNO_COMPAT_MANGLING %s
5 
6 #if __cplusplus > 201402L
7 
8 template<typename T> void redecl1() noexcept(noexcept(T())) {} // expected-note {{previous}}
9 template<typename T> void redecl1() noexcept(noexcept(T())); // ok, same type
10 template<typename T> void redecl1() noexcept(noexcept(T())) {} // expected-error {{redefinition}}
11 
12 template<bool A, bool B> void redecl2() noexcept(A); // expected-note {{previous}}
13 template<bool A, bool B> void redecl2() noexcept(B); // expected-error {{does not match previous}}
14 
15 // These have the same canonical type, but are still different.
16 template<typename A, typename B> void redecl3() throw(A); // expected-note {{previous}}
17 template<typename A, typename B> void redecl3() throw(B); // expected-error {{does not match previous}}
18 
19 typedef int I;
20 template<bool B> void redecl4(I) noexcept(B);
21 template<bool B> void redecl4(I) noexcept(B); // expected-note {{could not match 'void (I) noexcept(false)' (aka 'void (int) noexcept(false)') against 'void (int) noexcept'}}
22 
23 void (*init_with_exact_type_a)(int) noexcept = redecl4<true>;
24 void (*init_with_mismatched_type_a)(int) = redecl4<true>;
25 auto deduce_auto_from_noexcept_function_ptr_a = redecl4<true>;
26 using DeducedType_a = decltype(deduce_auto_from_noexcept_function_ptr_a);
27 using DeducedType_a = void (*)(int) noexcept;
28 
29 void (*init_with_exact_type_b)(int) = redecl4<false>;
30 void (*init_with_mismatched_type_b)(int) noexcept = redecl4<false>; // expected-error {{does not match required type}}
31 auto deduce_auto_from_noexcept_function_ptr_b = redecl4<false>;
32 using DeducedType_b = decltype(deduce_auto_from_noexcept_function_ptr_b);
33 using DeducedType_b = void (*)(int);
34 
35 static_assert(noexcept(init_with_exact_type_a(0)));
36 static_assert(noexcept((+init_with_exact_type_a)(0)));
37 static_assert(!noexcept(init_with_exact_type_b(0)));
38 static_assert(!noexcept((+init_with_exact_type_b)(0)));
39 
40 // Don't look through casts, use the direct type of the expression.
41 // FIXME: static_cast here would be reasonable, but is not currently permitted.
42 static_assert(noexcept(static_cast<decltype(init_with_exact_type_a)>(init_with_exact_type_b)(0))); // expected-error {{is not allowed}}
43 static_assert(noexcept(reinterpret_cast<decltype(init_with_exact_type_a)>(init_with_exact_type_b)(0)));
44 static_assert(!noexcept(static_cast<decltype(init_with_exact_type_b)>(init_with_exact_type_a)(0)));
45 
46 template<bool B> auto get_fn() noexcept -> void (*)() noexcept(B) {}
47 static_assert(noexcept(get_fn<true>()()));
48 static_assert(!noexcept(get_fn<false>()()));
49 
50 namespace DependentDefaultCtorExceptionSpec {
51   template<typename> struct T { static const bool value = true; };
52 
53   template<class A> struct map {
54     typedef A a;
55     map() noexcept(T<a>::value) {}
56   };
57 
58   template<class B> struct multimap {
59     typedef B b;
60     multimap() noexcept(T<b>::value) {}
61   };
62 
63   // Don't crash here.
64   struct A { multimap<int> Map; } a;
65 
66   static_assert(noexcept(A()));
67 }
68 
69 #endif
70 
71 namespace CompatWarning {
72   struct X;
73 
74   // These cases don't change.
75   void f0(void p() throw(int));
76   auto f0() -> void (*)() noexcept(false);
77 
78   // These cases take an ABI break in C++17 because their parameter / return types change.
79   void f1(void p() noexcept);
80   void f2(void (*p)() noexcept(true));
81   void f3(void (&p)() throw());
82   void f4(void (X::*p)() throw());
83   auto f5() -> void (*)() throw();
84   auto f6() -> void (&)() throw();
85   auto f7() -> void (X::*)() throw();
86 #if __cplusplus <= 201402L && !defined(NO_COMPAT_MANGLING)
87   // expected-warning@-8 {{mangled name of 'f1' will change in C++17 due to non-throwing exception specification in function signature}}
88   // expected-warning@-8 {{mangled name of 'f2' will change in C++17 due to non-throwing exception specification in function signature}}
89   // expected-warning@-8 {{mangled name of 'f3' will change in C++17 due to non-throwing exception specification in function signature}}
90   // expected-warning@-8 {{mangled name of 'f4' will change in C++17 due to non-throwing exception specification in function signature}}
91   // expected-warning@-8 {{mangled name of 'f5' will change in C++17 due to non-throwing exception specification in function signature}}
92   // expected-warning@-8 {{mangled name of 'f6' will change in C++17 due to non-throwing exception specification in function signature}}
93   // expected-warning@-8 {{mangled name of 'f7' will change in C++17 due to non-throwing exception specification in function signature}}
94 #endif
95 
96   // An instantiation-dependent exception specification needs to be mangled in
97   // all language modes, since it participates in SFINAE.
98   template<typename T> void g(void() throw(T)); // expected-note {{substitution failure}}
99   template<typename T> void g(...) = delete; // expected-note {{deleted}}
100   void test_g() { g<void>(nullptr); } // expected-error {{deleted}}
101 
102   // An instantiation-dependent exception specification needs to be mangled in
103   // all language modes, since it participates in SFINAE.
104   template<typename T> void h(void() noexcept(T())); // expected-note {{substitution failure}}
105   template<typename T> void h(...) = delete; // expected-note {{deleted}}
106   void test_h() { h<void>(nullptr); } // expected-error {{deleted}}
107 }
108 
109 namespace ImplicitExceptionSpec {
110   struct S {
111     ~S();
112     void f(const S &s = S());
113   };
114   S::~S() {}
115 }
116 
117 namespace Builtins {
118   // Pick two functions that ought to have the same noexceptness.
119   extern "C" int strcmp(const char *, const char *);
120   extern "C" int strncmp(const char *, const char *, decltype(sizeof(0))) noexcept;
121 
122   // Check we recognized both as builtins.
123   typedef int arr[strcmp("bar", "foo") + 4 * strncmp("foo", "bar", 4)]; // expected-warning {{variable length array}}
124   typedef int arr[3];
125 }
126 
127 namespace ExplicitInstantiation {
128   template<typename T> void f() noexcept {}
129   template<typename T> struct X { void f() noexcept {} };
130   template void f<int>();
131   template void X<int>::f();
132 }
133 
134 namespace ConversionFunction {
135   struct A { template<typename T> operator T() noexcept; };
136   int a = A().operator int();
137 }
138 
139 using size_t = decltype(sizeof(0));
140 
141 namespace OperatorDelete {
142   struct W {};
143   struct X {};
144   struct Y {};
145   struct Z {};
146   template<bool N, bool D> struct T {};
147 }
148 void *operator new(size_t, OperatorDelete::W) noexcept(false);
149 void operator delete(void*, OperatorDelete::W) noexcept(false) = delete; // expected-note {{here}}
150 void *operator new(size_t, OperatorDelete::X) noexcept(false);
151 void operator delete(void*, OperatorDelete::X) noexcept(true) = delete; // expected-note {{here}}
152 void *operator new(size_t, OperatorDelete::Y) noexcept(true);
153 void operator delete(void*, OperatorDelete::Y) noexcept(false) = delete; // expected-note {{here}}
154 void *operator new(size_t, OperatorDelete::Z) noexcept(true);
155 void operator delete(void*, OperatorDelete::Z) noexcept(true) = delete; // expected-note {{here}}
156 template<bool N, bool D> void *operator new(size_t, OperatorDelete::T<N, D>) noexcept(N);
157 template<bool N, bool D> void operator delete(void*, OperatorDelete::T<N, D>) noexcept(D) = delete; // expected-note 4{{here}}
158 namespace OperatorDelete {
159   struct A { A(); };
160   A *w = new (W{}) A; // expected-error {{deleted function}}
161   A *x = new (X{}) A; // expected-error {{deleted function}}
162   A *y = new (Y{}) A; // expected-error {{deleted function}}
163   A *z = new (Z{}) A; // expected-error {{deleted function}}
164 
165   A *t00 = new (T<false, false>{}) A; // expected-error {{deleted function}}
166   A *t01 = new (T<false, true>{}) A; // expected-error {{deleted function}}
167   A *t10 = new (T<true, false>{}) A; // expected-error {{deleted function}}
168   A *t11 = new (T<true, true>{}) A; // expected-error {{deleted function}}
169 }
170