1 // RUN: %clang_cc1 -fsyntax-only -verify %s
2 // RUN: %clang_cc1 -fsyntax-only -verify %s -triple x86_64-apple-darwin9
3 
4 void f1(int a)
5 {
6     __builtin_va_list ap;
7 
8     __builtin_va_start(ap, a, a); // expected-error {{too many arguments to function}}
9     __builtin_va_start(ap, a); // expected-error {{'va_start' used in function with fixed args}}
10 }
11 
12 void f2(int a, int b, ...)
13 {
14     __builtin_va_list ap;
15 
16     __builtin_va_start(ap, 10); // expected-warning {{second argument to 'va_start' is not the last named parameter}}
17     __builtin_va_start(ap, a); // expected-warning {{second argument to 'va_start' is not the last named parameter}}
18     __builtin_va_start(ap, b);
19 }
20 
21 void f3(float a, ...) { // expected-note 2{{parameter of type 'float' is declared here}}
22     __builtin_va_list ap;
23 
24     __builtin_va_start(ap, a); // expected-warning {{passing an object that undergoes default argument promotion to 'va_start' has undefined behavior}}
25     __builtin_va_start(ap, (a)); // expected-warning {{passing an object that undergoes default argument promotion to 'va_start' has undefined behavior}}
26 }
27 
28 
29 // stdarg: PR3075
30 void f4(const char *msg, ...) {
31  __builtin_va_list ap;
32  __builtin_stdarg_start((ap), (msg));
33  __builtin_va_end (ap);
34 }
35 
36 void f5() {
37   __builtin_va_list ap;
38   __builtin_va_start(ap,ap); // expected-error {{'va_start' used in function with fixed args}}
39 }
40 
41 void f6(int a, ...) {
42   __builtin_va_list ap;
43   __builtin_va_start(ap); // expected-error {{too few arguments to function}}
44 }
45 
46 // PR3350
47 void
48 foo(__builtin_va_list authors, ...) {
49   __builtin_va_start (authors, authors);
50   (void)__builtin_va_arg(authors, int);
51   __builtin_va_end (authors);
52 }
53 
54 void f7(int a, ...) {
55   __builtin_va_list ap;
56   __builtin_va_start(ap, a);
57   // FIXME: This error message is sub-par.
58   __builtin_va_arg(ap, int) = 1; // expected-error {{expression is not assignable}}
59   int *x = &__builtin_va_arg(ap, int); // expected-error {{cannot take the address of an rvalue}}
60   __builtin_va_end(ap);
61 }
62 
63 void f8(int a, ...) {
64   __builtin_va_list ap;
65   __builtin_va_start(ap, a);
66   (void)__builtin_va_arg(ap, void); // expected-error {{second argument to 'va_arg' is of incomplete type 'void'}}
67   __builtin_va_end(ap);
68 }
69 
70 enum E { x = -1, y = 2, z = 10000 };
71 void f9(__builtin_va_list args)
72 {
73     (void)__builtin_va_arg(args, float); // expected-warning {{second argument to 'va_arg' is of promotable type 'float'}}
74     (void)__builtin_va_arg(args, enum E); // Don't warn here in C
75     (void)__builtin_va_arg(args, short); // expected-warning {{second argument to 'va_arg' is of promotable type 'short'}}
76     (void)__builtin_va_arg(args, char); // expected-warning {{second argument to 'va_arg' is of promotable type 'char'}}
77 }
78 
79 void f10(int a, ...) {
80   int i;
81   __builtin_va_list ap;
82   i = __builtin_va_start(ap, a); // expected-error {{assigning to 'int' from incompatible type 'void'}}
83   __builtin_va_end(ap);
84 }
85 
86 void f11(short s, ...) {  // expected-note {{parameter of type 'short' is declared here}}
87   __builtin_va_list ap;
88   __builtin_va_start(ap, s); // expected-warning {{passing an object that undergoes default argument promotion to 'va_start' has undefined behavior}}
89   __builtin_va_end(ap);
90 }
91 
92 void f12(register int i, ...) {  // expected-note {{parameter of type 'int' is declared here}}
93   __builtin_va_list ap;
94   __builtin_va_start(ap, i); // expected-warning {{passing a parameter declared with the 'register' keyword to 'va_start' has undefined behavior}}
95   __builtin_va_end(ap);
96 }
97