forked from OSchip/llvm-project
90 lines
3.0 KiB
C++
90 lines
3.0 KiB
C++
// RUN: %clang_cc1 -std=c++03 -Wno-c++11-extensions -triple i386-pc-unknown -verify %s
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// RUN: %clang_cc1 -std=c++11 -triple x86_64-apple-darwin9 -verify %s
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__builtin_va_list ap;
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class string;
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void f(const string& s, ...) { // expected-note {{parameter of type 'const string &' is declared here}}
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__builtin_va_start(ap, s); // expected-warning {{passing an object of reference type to 'va_start' has undefined behavior}}
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}
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void g(register int i, ...) { // expected-warning 0-1{{deprecated}}
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__builtin_va_start(ap, i); // UB in C, OK in C++
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}
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// Don't crash when there is no last parameter.
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void no_params(...) {
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int a;
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__builtin_va_start(ap, a); // expected-warning {{second argument to 'va_start' is not the last named parameter}}
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}
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// Reject this. The __builtin_va_start would execute in Foo's non-variadic
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// default ctor.
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void record_context(int a, ...) {
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struct Foo {
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// expected-error@+2 {{'va_start' cannot be used outside a function}}
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// expected-error@+1 {{default argument references parameter 'a'}}
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void meth(int a, int b = (__builtin_va_start(ap, a), 0)) {}
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};
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}
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// Ensure the correct behavior for promotable type UB checking.
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void promotable(int a, ...) {
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enum Unscoped1 { One = 0x7FFFFFFF };
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(void)__builtin_va_arg(ap, Unscoped1); // ok
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enum Unscoped2 { Two = 0xFFFFFFFF };
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(void)__builtin_va_arg(ap, Unscoped2); // ok
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enum class Scoped { Three };
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(void)__builtin_va_arg(ap, Scoped); // ok
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enum Fixed : int { Four };
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(void)__builtin_va_arg(ap, Fixed); // ok
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enum FixedSmall : char { Five };
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(void)__builtin_va_arg(ap, FixedSmall); // expected-warning {{second argument to 'va_arg' is of promotable type 'FixedSmall'; this va_arg has undefined behavior because arguments will be promoted to 'int'}}
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enum FixedLarge : long long { Six };
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(void)__builtin_va_arg(ap, FixedLarge); // ok
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// Ensure that qualifiers are ignored.
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(void)__builtin_va_arg(ap, const volatile int); // ok
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// Ensure that signed vs unsigned doesn't matter either.
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(void)__builtin_va_arg(ap, unsigned int);
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(void)__builtin_va_arg(ap, bool); // expected-warning {{second argument to 'va_arg' is of promotable type 'bool'; this va_arg has undefined behavior because arguments will be promoted to 'int'}}
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}
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#if __cplusplus >= 201103L
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// We used to have bugs identifying the correct enclosing function scope in a
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// lambda.
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void fixed_lambda_varargs_function(int a, ...) {
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[](int b) {
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__builtin_va_start(ap, b); // expected-error {{'va_start' used in function with fixed args}}
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}(42);
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}
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void varargs_lambda_fixed_function(int a) {
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[](int b, ...) {
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__builtin_va_start(ap, b); // correct
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}(42);
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}
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auto fixed_lambda_global = [](int f) {
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__builtin_va_start(ap, f); // expected-error {{'va_start' used in function with fixed args}}
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};
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auto varargs_lambda_global = [](int f, ...) {
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__builtin_va_start(ap, f); // correct
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};
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void record_member_init(int a, ...) {
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struct Foo {
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int a = 0;
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// expected-error@+1 {{'va_start' cannot be used outside a function}}
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int b = (__builtin_va_start(ap, a), 0);
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};
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}
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#endif
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