1 // RUN: %clang_cc1 -fsyntax-only -verify -pedantic %s
2 // RUN: %clang_cc1 -fsyntax-only -verify -pedantic -std=gnu++98 %s
3 // RUN: %clang_cc1 -fsyntax-only -verify -pedantic -std=gnu++11 %s
4
5 // C++-specific tests for integral constant expressions.
6
7 const int c = 10;
8 int ar[c];
9
10 struct X0 {
11 static const int value = static_cast<int>(4.0);
12 };
13
f()14 void f() {
15 if (const int value = 17) {
16 int array[value];
17 }
18 }
19
a()20 int a() {
21 const int t=t; // expected-note {{declared here}}
22
23 switch(1) { // do not warn that 1 is not a case value;
24 // 't' might have been expected to evalaute to 1
25 case t:; // expected-note {{initializer of 't' is not a constant expression}}
26 #if __cplusplus <= 199711L
27 // expected-error@-2 {{not an integral constant expression}}
28 #else
29 // expected-error@-4 {{case value is not a constant expression}}
30 #endif
31 }
32 }
33
34 // PR6206: out-of-line definitions are legit
35 namespace pr6206 {
36 class Foo {
37 public:
38 static const int kBar;
39 };
40
41 const int Foo::kBar = 20;
42
Test()43 char Test() {
44 char str[Foo::kBar];
45 str[0] = '0';
46 return str[0];
47 }
48 }
49
50 // PR6373: default arguments don't count.
pr6373(const unsigned x=0)51 void pr6373(const unsigned x = 0) {
52 unsigned max = 80 / x;
53 }
54
55
56 namespace rdar9204520 {
57
58 struct A {
59 static const int B = int(0.75 * 1000 * 1000);
60 #if __cplusplus <= 199711L
61 // expected-warning@-2 {{not a constant expression; folding it to a constant is a GNU extension}}
62 #endif
63 };
64
foo()65 int foo() { return A::B; }
66 }
67
68 // PR11040
69 const int x = 10;
70 int* y = reinterpret_cast<const char&>(x); // expected-error {{cannot initialize}}
71
72 // This isn't an integral constant expression, but make sure it folds anyway.
73 struct PR8836 { char _; long long a; };
74 #if __cplusplus <= 199711L
75 // expected-warning@-2 {{'long long' is a C++11 extension}}
76 #endif
77
78 int PR8836test[(__typeof(sizeof(int)))&reinterpret_cast<const volatile char&>((((PR8836*)0)->a))];
79 // expected-warning@-1 0-1{{variable length arrays in C++ are a Clang extension}} expected-warning@-1 {{folded to constant array as an extension}}
80 // expected-note@-2 {{cast that performs the conversions of a reinterpret_cast is not allowed in a constant expression}}
81
82 const int nonconst = 1.0;
83 #if __cplusplus <= 199711L
84 // expected-note@-2 {{declared here}}
85 #endif
86 int arr[nonconst];
87 #if __cplusplus <= 199711L
88 // expected-warning@-2 0-1{{variable length arrays in C++ are a Clang extension}} expected-warning@-2 {{folded to constant array as an extension}}
89 // expected-note@-3 {{initializer of 'nonconst' is not a constant expression}}
90 #endif
91
92 const int castfloat = static_cast<int>(1.0);
93 int arr2[castfloat]; // ok
94