clang/test/Sema/varargs.c

   1 // RUN: %clang_cc1 -fsyntax-only -verify %s -triple i386-pc-unknown
   2 // RUN: %clang_cc1 -fsyntax-only -verify %s -triple x86_64-apple-darwin9
   3 // RUN: %clang_cc1 -fsyntax-only -fms-compatibility -DMS -verify %s -triple x86_64-pc-win32
   4
   5 void f1(int a)
   6 {
   7     __builtin_va_list ap;
   8
   9     __builtin_va_start(ap, a, a); // expected-error {{too many arguments to function}}
  10     __builtin_va_start(ap, a); // expected-error {{'va_start' used in function with fixed args}}
  11 }
  12
  13 void f2(int a, int b, ...)
  14 {
  15     __builtin_va_list ap;
  16
  17     __builtin_va_start(ap, 10); // expected-warning {{second argument to 'va_start' is not the last named parameter}}
  18     __builtin_va_start(ap, a); // expected-warning {{second argument to 'va_start' is not the last named parameter}}
  19     __builtin_va_start(ap, b);
  20 }
  21
  22 void f3(float a, ...) { // expected-note 2{{parameter of type 'float' is declared here}}
  23     __builtin_va_list ap;
  24
  25     __builtin_va_start(ap, a); // expected-warning {{passing an object that undergoes default argument promotion to 'va_start' has undefined behavior}}
  26     __builtin_va_start(ap, (a)); // expected-warning {{passing an object that undergoes default argument promotion to 'va_start' has undefined behavior}}
  27 }
  28
  29
  30 // stdarg: PR3075 and PR2531
  31 void f4(const char *msg, ...) {
  32  __builtin_va_list ap;
  33  __builtin_stdarg_start((ap), (msg));
  34  __builtin_va_end (ap);
  35 }
  36
  37 void f5(void) {
  38   __builtin_va_list ap;
  39   __builtin_va_start(ap,ap); // expected-error {{'va_start' used in function with fixed args}}
  40 }
  41
  42 void f6(int a, ...) {
  43   __builtin_va_list ap;
  44   __builtin_va_start(ap); // expected-error {{too few arguments to function}}
  45 }
  46
  47 // PR3350
  48 void
  49 foo(__builtin_va_list authors, ...) {
  50   __builtin_va_start (authors, authors);
  51   (void)__builtin_va_arg(authors, int);
  52   __builtin_va_end (authors);
  53 }
  54
  55 void f7(int a, ...) {
  56   __builtin_va_list ap;
  57   __builtin_va_start(ap, a);
  58   // FIXME: This error message is sub-par.
  59   __builtin_va_arg(ap, int) = 1; // expected-error {{expression is not assignable}}
  60   int *x = &__builtin_va_arg(ap, int); // expected-error {{cannot take the address of an rvalue}}
  61   __builtin_va_end(ap);
  62 }
  63
  64 void f8(int a, ...) {
  65   __builtin_va_list ap;
  66   __builtin_va_start(ap, a);
  67   (void)__builtin_va_arg(ap, void); // expected-error {{second argument to 'va_arg' is of incomplete type 'void'}}
  68   __builtin_va_end(ap);
  69 }
  70
  71 enum E { x = -1, y = 2, z = 10000 };
  72 void f9(__builtin_va_list args)
  73 {
  74     (void)__builtin_va_arg(args, float); // expected-warning {{second argument to 'va_arg' is of promotable type 'float'}}
  75     (void)__builtin_va_arg(args, enum E); // Don't warn here in C
  76     (void)__builtin_va_arg(args, short); // expected-warning {{second argument to 'va_arg' is of promotable type 'short'}}
  77     (void)__builtin_va_arg(args, char); // expected-warning {{second argument to 'va_arg' is of promotable type 'char'}}
  78 }
  79
  80 void f10(int a, ...) {
  81   int i;
  82   __builtin_va_list ap;
  83   i = __builtin_va_start(ap, a); // expected-error {{assigning to 'int' from incompatible type 'void'}}
  84   __builtin_va_end(ap);
  85 }
  86
  87 void f11(short s, ...) {  // expected-note {{parameter of type 'short' is declared here}}
  88   __builtin_va_list ap;
  89   __builtin_va_start(ap, s); // expected-warning {{passing an object that undergoes default argument promotion to 'va_start' has undefined behavior}}
  90   __builtin_va_end(ap);
  91 }
  92
  93 void f12(register int i, ...) {  // expected-note {{parameter of type 'int' is declared here}}
  94   __builtin_va_list ap;
  95   __builtin_va_start(ap, i); // expected-warning {{passing a parameter declared with the 'register' keyword to 'va_start' has undefined behavior}}
  96   __builtin_va_end(ap);
  97 }
  98
  99 enum __attribute__((packed)) E1 {
 100   one1
 101 };
 102
 103 void f13(enum E1 e, ...) {
 104   __builtin_va_list va;
 105   __builtin_va_start(va, e);
 106 #ifndef MS
 107   // In Microsoft compatibility mode, all enum types are int, but in
 108   // non-ms-compatibility mode, this enumeration type will undergo default
 109   // argument promotions.
 110   // expected-note@-7 {{parameter of type 'enum E1' is declared here}}
 111   // expected-warning@-6 {{passing an object that undergoes default argument promotion to 'va_start' has undefined behavior}}
 112 #endif
 113   __builtin_va_end(va);
 114 }
 115
 116 void f14(int e, ...) {
 117   // expected-error@+3 {{call to undeclared library function 'va_start'}}
 118   // expected-note@+2 {{include the header <stdarg.h>}}
 119   // expected-error@+1 {{too few arguments to function call}}
 120   va_start();
 121   __builtin_va_list va;
 122   va_start(va, e);
 123 }