1 // RUN: %clang_cc1 -fsyntax-only -verify -triple x86_64-linux %s -Wno-tautological-pointer-compare -Wno-pointer-to-int-cast
2
3 #define EVAL_EXPR(testno, expr) enum { test##testno = (expr) }; struct check_positive##testno { int a[test##testno]; };
4 int x;
5 EVAL_EXPR(1, (_Bool)&x)
6 EVAL_EXPR(2, (int)(1.0+(double)4))
7 EVAL_EXPR(3, (int)(1.0+(float)4.0))
8 EVAL_EXPR(4, (_Bool)(1 ? (void*)&x : 0))
9 EVAL_EXPR(5, (_Bool)(int[]){0})
10 struct y {int x,y;};
11 EVAL_EXPR(6, (int)(1+(struct y*)0))
12 EVAL_EXPR(7, (int)&((struct y*)0)->y)
13 EVAL_EXPR(8, (_Bool)"asdf")
14 EVAL_EXPR(9, !!&x)
15 EVAL_EXPR(10, ((void)1, 12))
16 void g0(void);
17 EVAL_EXPR(11, (g0(), 12)) // expected-error {{not an integer constant expression}}
18 EVAL_EXPR(12, 1.0&&2.0)
19 EVAL_EXPR(13, x || 3.0) // expected-error {{not an integer constant expression}}
20
21 unsigned int l_19 = 1;
22 EVAL_EXPR(14, (1 ^ l_19) && 1); // expected-error {{not an integer constant expression}}
23
f()24 void f()
25 {
26 int a;
27 EVAL_EXPR(15, (_Bool)&a);
28 }
29
30 // FIXME: Turn into EVAL_EXPR test once we have more folding.
31 _Complex float g16 = (1.0f + 1.0fi);
32
33 // ?: in constant expressions.
34 int g17[(3?:1) - 2];
35
36 EVAL_EXPR(18, ((int)((void*)10 + 10)) == 20 ? 1 : -1);
37
38 struct s {
39 int a[(int)-1.0f]; // expected-error {{array size is negative}}
40 };
41
42 EVAL_EXPR(19, ((int)&*(char*)10 == 10 ? 1 : -1));
43
44 EVAL_EXPR(20, __builtin_constant_p(*((int*) 10)));
45
46 EVAL_EXPR(21, (__imag__ 2i) == 2 ? 1 : -1);
47
48 EVAL_EXPR(22, (__real__ (2i+3)) == 3 ? 1 : -1);
49
50 int g23[(int)(1.0 / 1.0)] = { 1 }; // expected-warning {{folded to constant array}}
51 int g24[(int)(1.0 / 1.0)] = { 1 , 2 }; // expected-warning {{folded to constant array}} expected-warning {{excess elements in array initializer}}
52 int g25[(int)(1.0 + 1.0)], g26 = sizeof(g25); // expected-warning {{folded to constant array}}
53
54 EVAL_EXPR(26, (_Complex double)0 ? -1 : 1)
55 EVAL_EXPR(27, (_Complex int)0 ? -1 : 1)
56 EVAL_EXPR(28, (_Complex double)1 ? 1 : -1)
57 EVAL_EXPR(29, (_Complex int)1 ? 1 : -1)
58
59
60 // PR4027 + rdar://6808859
61 struct a { int x, y; };
62 static struct a V2 = (struct a)(struct a){ 1, 2};
63 static const struct a V1 = (struct a){ 1, 2};
64
65 EVAL_EXPR(30, (int)(_Complex float)((1<<30)-1) == (1<<30) ? 1 : -1)
66 EVAL_EXPR(31, (int*)0 == (int*)0 ? 1 : -1)
67 EVAL_EXPR(32, (int*)0 != (int*)0 ? -1 : 1)
68 EVAL_EXPR(33, (void*)0 - (void*)0 == 0 ? 1 : -1)
foo(void)69 void foo(void) {}
70 EVAL_EXPR(34, (foo == (void *)0) ? -1 : 1)
71
72 // No PR. Mismatched bitwidths lead to a crash on second evaluation.
73 const _Bool constbool = 0;
74 EVAL_EXPR(35, constbool)
75 EVAL_EXPR(36, constbool)
76
77 EVAL_EXPR(37, (1,2.0) == 2.0 ? 1 : -1)
78 EVAL_EXPR(38, __builtin_expect(1,1) == 1 ? 1 : -1)
79
80 // PR7884
81 EVAL_EXPR(39, __real__(1.f) == 1 ? 1 : -1)
82 EVAL_EXPR(40, __imag__(1.f) == 0 ? 1 : -1)
83
84 // From gcc testsuite
85 EVAL_EXPR(41, (int)(1+(_Complex unsigned)2))
86
87 // rdar://8875946
rdar8875946()88 void rdar8875946() {
89 double _Complex P;
90 float _Complex P2 = 3.3f + P;
91 }
92
93 double d = (d = 0.0); // expected-error {{not a compile-time constant}}
94 double d2 = ++d; // expected-error {{not a compile-time constant}}
95
96 int n = 2;
97 int intLvalue[*(int*)((long)&n ?: 1)] = { 1, 2 }; // expected-error {{variable length array}}
98
99 union u { int a; char b[4]; };
100 char c = ((union u)(123456)).b[0]; // expected-error {{not a compile-time constant}}
101
102 extern const int weak_int __attribute__((weak));
103 const int weak_int = 42;
104 int weak_int_test = weak_int; // expected-error {{not a compile-time constant}}
105
106 int literalVsNull1 = "foo" == 0;
107 int literalVsNull2 = 0 == "foo";
108
109 // PR11385.
110 int castViaInt[*(int*)(unsigned long)"test"]; // expected-error {{variable length array}}
111
112 // PR11391.
113 struct PR11391 { _Complex float f; } pr11391;
114 EVAL_EXPR(42, __builtin_constant_p(pr11391.f = 1))
115
116 // PR12043
117 float varfloat;
118 const float constfloat = 0;
119 EVAL_EXPR(43, varfloat && constfloat) // expected-error {{not an integer constant expression}}
120
121 // <rdar://problem/10962435>
122 EVAL_EXPR(45, ((char*)-1) + 1 == 0 ? 1 : -1)
123 EVAL_EXPR(46, ((char*)-1) + 1 < (char*) -1 ? 1 : -1)
124 EVAL_EXPR(47, &x < &x + 1 ? 1 : -1)
125 EVAL_EXPR(48, &x != &x - 1 ? 1 : -1)
126 EVAL_EXPR(49, &x < &x - 100 ? 1 : -1) // expected-error {{not an integer constant expression}}
127
128 extern struct Test50S Test50;
129 EVAL_EXPR(50, &Test50 < (struct Test50S*)((unsigned long)&Test50 + 10)) // expected-error {{not an integer constant expression}}
130
131 // <rdar://problem/11874571>
132 EVAL_EXPR(51, 0 != (float)1e99)
133
134 // PR21945
PR21945()135 void PR21945() { int i = (({}), 0l); }
136
137 void PR24622();
138 struct PR24622 {} pr24622;
139 EVAL_EXPR(52, &pr24622 == (void *)&PR24622); // expected-error {{not an integer constant expression}}
140
141 // We evaluate these by providing 2s' complement semantics in constant
142 // expressions, like we do for integers.
143 void *PR28739a = (__int128)(unsigned long)-1 + &PR28739a; // expected-warning {{the pointer incremented by 18446744073709551615 refers past the last possible element for an array in 64-bit address space containing 64-bit (8-byte) elements (max possible 2305843009213693952 elements)}}
144 void *PR28739b = &PR28739b + (__int128)(unsigned long)-1; // expected-warning {{refers past the last possible element}}
145 __int128 PR28739c = (&PR28739c + (__int128)(unsigned long)-1) - &PR28739c; // expected-warning {{refers past the last possible element}}
146 void *PR28739d = &(&PR28739d)[(__int128)(unsigned long)-1]; // expected-warning {{refers past the last possible element}}
147
148 struct PR35214_X {
149 int k;
150 int arr[];
151 };
152 int PR35214_x;
153 int PR35214_y = ((struct PR35214_X *)&PR35214_x)->arr[1]; // expected-error {{not a compile-time constant}}
154 int *PR35214_z = &((struct PR35214_X *)&PR35214_x)->arr[1]; // ok, &PR35214_x + 2
155