1 // RUN: %clang_cc1 %s -ffreestanding -Wno-int-to-pointer-cast -fsyntax-only -verify -pedantic -fpascal-strings -std=c99
2
3 #include <stdint.h>
4 #include <limits.h>
5
a(void)6 int a(void) {int p; *(1 ? &p : (void*)(0 && (a(),1))) = 10;} /* expected-error {{incomplete type 'void' is not assignable}}
7 expected-warning {{ISO C does not allow indirection on operand of type 'void *'}} */
8
9 // ?: with __builtin_constant_p as the operand is an i-c-e.
10 int expr;
11 char w[__builtin_constant_p(expr) ? expr : 1];
12
13 char v[sizeof(__builtin_constant_p(0)) == sizeof(int) ? 1 : -1];
14
15 int implicitConversion = 1.0;
16 char floatArith[(int)(1.0+2.0)]; // expected-warning {{variable length array folded to constant array as an extension}}
17
18 // __builtin_constant_p as the condition of ?: allows arbitrary foldable
19 // constants to be transmogrified into i-c-e's.
20 char b[__builtin_constant_p((int)(1.0+2.0)) ? (int)(1.0+2.0) : -1];
21
22 struct c {
23 int a : (
24 __builtin_constant_p((int)(1.0+2.0)) ? (int)(1.0+
25 expr // expected-error {{expression is not an integer constant expression}}
26 ) : -1);
27 };
28
29 // Check that we can evaluate statement-expressions properly when
30 // constant-folding inside an ICE.
PR49239(void)31 void PR49239(void) {
32 goto check_not_vla;
33 char not_vla[__builtin_constant_p(1) ? ({ 42; }) : -1]; // expected-warning {{statement expression}}
34 check_not_vla:;
35 _Static_assert(sizeof(not_vla) == 42, ""); // expected-warning {{C11 extension}}
36
37 // It's not clear that this should be valid: __builtin_expect(expr1, expr2)
38 // should probably be an ICE if and only if expr1 is an ICE, but we roughly
39 // follow GCC in treating it as an ICE if and only if we can evaluate expr1
40 // regardless of whether it's an ICE.
41 goto check_also_not_vla;
42 char also_not_vla[__builtin_expect(({ 76; }), 0)]; // expected-warning {{statement expression}}
43 check_also_not_vla:;
44 _Static_assert(sizeof(also_not_vla) == 76, ""); // expected-warning {{C11 extension}}
45 }
46
47
test1(int n,int * p)48 void test1(int n, int* p) { *(n ? p : (void *)(7-7)) = 1; }
test2(int n,int * p)49 void test2(int n, int* p) { *(n ? p : (void *)0) = 1; }
50
51
52
53 char array[1024/(sizeof (long))];
54
55 int x['\xBb' == (char) 187 ? 1: -1];
56
57 // PR1992
func(int x)58 void func(int x)
59 {
60 switch (x) {
61 case sizeof("abc"): break;
62 case sizeof("loooong"): func(4);
63 case sizeof("\ploooong"): func(4);
64 }
65 }
66
67 int expr;
68 char y[__builtin_constant_p(expr) ? -1 : 1];
69 char z[__builtin_constant_p(4) ? 1 : -1];
70
71 // Comma tests
72 int comma1[0?1,2:3]; // expected-warning {{left operand of comma operator has no effect}}
73 int comma2[1 || (1, 2)]; // expected-warning {{use of logical '||' with constant operand}} \
74 // expected-note {{use '|' for a bitwise operation}} \
75 // expected-warning {{left operand of comma operator has no effect}}
76 int comma3[(1, 2)]; // expected-warning {{variable length array folded to constant array as an extension}} \
77 // expected-warning {{left operand of comma operator has no effect}}
78
79 // Pointer + __builtin_constant_p
80 char pbcp[__builtin_constant_p(4) ? (intptr_t)&expr : 0]; // expected-error {{variable length array declaration not allowed at file scope}}
81
82 int illegaldiv1a[1 || 1/0];
83 int illegaldiv1b[1 && 1/0]; //expected-error{{variable length array declaration not allowed at file scope}}
84
85 int illegaldiv2[1/0]; // expected-error {{variable length array declaration not allowed at file scope}}
86 int illegaldiv3[INT_MIN / -1]; // expected-error {{variable length array declaration not allowed at file scope}}
87 // PR9262
88 int illegaldiv4[0 / (1 / 0)]; // expected-error {{variable length array declaration not allowed at file scope}}
89
90 int chooseexpr[__builtin_choose_expr(1, 1, expr)];
91 int realop[(__real__ 4) == 4 ? 1 : -1];
92 int imagop[(__imag__ 4) == 0 ? 1 : -1];
93
94 int *PR14729 = 0 ?: 1/0; // expected-error {{not a compile-time constant}} expected-warning 2{{}} expected-error {{incompatible integer to pointer conversion initializing 'int *' with an expression of type 'int'}}
95
96 int bcp_call_v;
97 int bcp_call_a[] = {__builtin_constant_p(bcp_call_v && 0) ? bcp_call_v && 0 : -1};
98