129 lines · c
1// RUN: %clang_cc1 -fsyntax-only -verify %s -triple i386-pc-unknown2// RUN: %clang_cc1 -fsyntax-only -verify %s -triple x86_64-apple-darwin93// RUN: %clang_cc1 -fsyntax-only -fms-compatibility -DMS -verify %s -triple x86_64-pc-win324 5void 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 13void 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 non-variadic parameter}}18 __builtin_va_start(ap, a); // expected-warning {{second argument to 'va_start' is not the last non-variadic parameter}}19 __builtin_va_start(ap, b);20}21 22void 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 PR253131void f4(const char *msg, ...) {32 __builtin_va_list ap;33 __builtin_stdarg_start((ap), (msg));34 __builtin_va_end (ap);35}36 37void 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 42void f6(int a, ...) {43 __builtin_va_list ap;44 __builtin_va_start(ap); // expected-error {{too few arguments to function}}45}46 47// PR335048void49foo(__builtin_va_list authors, ...) {50 __builtin_va_start (authors, authors);51 (void)__builtin_va_arg(authors, int);52 __builtin_va_end (authors);53}54 55void 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 64void 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 71enum E { x = -1, y = 2, z = 10000 };72void 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 C76 (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 // Don't crash on some undefined behaviors.79 int n;80 (void)__builtin_va_arg(args, int[10]); // expected-warning{{second argument to 'va_arg' is of array type 'int[10]'}}81 (void)__builtin_va_arg(args, int[++n]); // expected-warning{{second argument to 'va_arg' is of array type 'int[++n]'}}82 (void)__builtin_va_arg(args, int[n][n]); // expected-warning{{second argument to 'va_arg' is of array type 'int[n][n]'}}83}84 85void f10(int a, ...) {86 int i;87 __builtin_va_list ap;88 i = __builtin_va_start(ap, a); // expected-error {{assigning to 'int' from incompatible type 'void'}}89 __builtin_va_end(ap);90}91 92void f11(short s, ...) { // expected-note {{parameter of type 'short' is declared here}}93 __builtin_va_list ap;94 __builtin_va_start(ap, s); // expected-warning {{passing an object that undergoes default argument promotion to 'va_start' has undefined behavior}}95 __builtin_va_end(ap);96}97 98void f12(register int i, ...) { // expected-note {{parameter of type 'int' is declared here}}99 __builtin_va_list ap;100 __builtin_va_start(ap, i); // expected-warning {{passing a parameter declared with the 'register' keyword to 'va_start' has undefined behavior}}101 __builtin_va_end(ap);102}103 104enum __attribute__((packed)) E1 {105 one1106};107 108void f13(enum E1 e, ...) {109 __builtin_va_list va;110 __builtin_va_start(va, e);111#ifndef MS112 // In Microsoft compatibility mode, all enum types are int, but in113 // non-ms-compatibility mode, this enumeration type will undergo default114 // argument promotions.115 // expected-note@-7 {{parameter of type 'enum E1' is declared here}}116 // expected-warning@-6 {{passing an object that undergoes default argument promotion to 'va_start' has undefined behavior}}117#endif118 __builtin_va_end(va);119}120 121void f14(int e, ...) {122 // expected-error@+3 {{call to undeclared library function 'va_start'}}123 // expected-note@+2 {{include the header <stdarg.h>}}124 // expected-error@+1 {{too few arguments to function call}}125 va_start();126 __builtin_va_list va;127 va_start(va, e);128}129