| 1 | // RUN: %clang_cc1 -std=c++03 -verify %s |
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| 2 | // RUN: %clang_cc1 -std=c++11 -verify %s |
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| 3 | |
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| 4 | __builtin_va_list ap; |
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| 5 | |
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| 6 | class string; |
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| 7 | void f(const string& s, ...) { // expected-note {{parameter of type 'const string &' is declared here}} |
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| 8 | __builtin_va_start(ap, s); // expected-warning {{passing an object of reference type to 'va_start' has undefined behavior}} |
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| 9 | } |
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| 10 | |
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| 11 | void g(register int i, ...) { // expected-warning 0-1{{deprecated}} |
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| 12 | __builtin_va_start(ap, i); // UB in C, OK in C++ |
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| 13 | } |
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| 14 | |
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| 15 | // Don't crash when there is no last parameter. |
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| 16 | void no_params(...) { |
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| 17 | int a; |
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| 18 | __builtin_va_start(ap, a); // expected-warning {{second argument to 'va_start' is not the last named parameter}} |
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| 19 | } |
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| 20 | |
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| 21 | // Reject this. The __builtin_va_start would execute in Foo's non-variadic |
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| 22 | // default ctor. |
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| 23 | void record_context(int a, ...) { |
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| 24 | struct Foo { |
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| 25 | // expected-error@+1 {{'va_start' cannot be used outside a function}} |
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| 26 | void meth(int a, int b = (__builtin_va_start(ap, a), 0)) {} |
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| 27 | }; |
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| 28 | } |
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| 29 | |
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| 30 | #if __cplusplus >= 201103L |
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| 31 | // We used to have bugs identifying the correct enclosing function scope in a |
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| 32 | // lambda. |
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| 33 | |
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| 34 | void fixed_lambda_varargs_function(int a, ...) { |
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| 35 | [](int b) { |
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| 36 | __builtin_va_start(ap, b); // expected-error {{'va_start' used in function with fixed args}} |
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| 37 | }(42); |
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| 38 | } |
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| 39 | void varargs_lambda_fixed_function(int a) { |
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| 40 | [](int b, ...) { |
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| 41 | __builtin_va_start(ap, b); // correct |
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| 42 | }(42); |
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| 43 | } |
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| 44 | |
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| 45 | auto fixed_lambda_global = [](int f) { |
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| 46 | __builtin_va_start(ap, f); // expected-error {{'va_start' used in function with fixed args}} |
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| 47 | }; |
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| 48 | auto varargs_lambda_global = [](int f, ...) { |
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| 49 | __builtin_va_start(ap, f); // correct |
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| 50 | }; |
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| 51 | |
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| 52 | void record_member_init(int a, ...) { |
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| 53 | struct Foo { |
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| 54 | int a = 0; |
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| 55 | // expected-error@+1 {{'va_start' cannot be used outside a function}} |
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| 56 | int b = (__builtin_va_start(ap, a), 0); |
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| 57 | }; |
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| 58 | } |
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| 59 | #endif |
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| 60 | |
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