58ea1059df
Reland https://reviews.llvm.org/D76696 All known crashes have been fixed, another attemption. We have rolled out this to all internal users for a while, didn't see big issues, we consider it is stable enough. Reviewed By: sammccall Subscribers: rsmith, hubert.reinterpretcast, ebevhan, jkorous, arphaman, kadircet, usaxena95, cfe-commits Tags: #clang Differential Revision: https://reviews.llvm.org/D78350
61 lines
1.8 KiB
C++
61 lines
1.8 KiB
C++
// RUN: %clang_cc1 -std=c++03 -verify %s
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// RUN: %clang_cc1 -std=c++11 -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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#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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