warn-undefined-bool-conversion.cpp
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// RUN: %clang_cc1 -fsyntax-only -verify %s
// RUN: %clang_cc1 -fsyntax-only -verify -Wundefined-bool-conversion %s
// RUN: %clang_cc1 -fsyntax-only -verify -Wno-bool-conversion -Wundefined-bool-conversion %s
// RUN: %clang_cc1 -fsyntax-only -verify -Wbool-conversion %s
void test1(int &x) {
if (x == 1) { }
if (&x) { }
// expected-warning@-1{{reference cannot be bound to dereferenced null pointer in well-defined C++ code; pointer may be assumed to always convert to true}}
if (!&x) { }
// expected-warning@-1{{reference cannot be bound to dereferenced null pointer in well-defined C++ code; pointer may be assumed to always convert to true}}
}
class test2 {
test2() : x(y) {}
void foo() {
if (this) { }
// expected-warning@-1{{'this' pointer cannot be null in well-defined C++ code; pointer may be assumed to always convert to true}}
if (!this) { }
// expected-warning@-1{{'this' pointer cannot be null in well-defined C++ code; pointer may be assumed to always convert to true}}
}
void bar() {
if (x == 1) { }
if (&x) { }
// expected-warning@-1{{reference cannot be bound to dereferenced null pointer in well-defined C++ code; pointer may be assumed to always convert to true}}
if (!&x) { }
// expected-warning@-1{{reference cannot be bound to dereferenced null pointer in well-defined C++ code; pointer may be assumed to always convert to true}}
}
int &x;
int y;
};
namespace function_return_reference {
int& get_int();
// expected-note@-1 3{{'get_int' returns a reference}}
class B {
public:
static int &stat();
// expected-note@-1 3{{'stat' returns a reference}}
int &get();
// expected-note@-1 6{{'get' returns a reference}}
};
void test() {
if (&get_int()) {}
// expected-warning@-1{{reference cannot be bound to dereferenced null pointer in well-defined C++ code; pointer may be assumed to always convert to true}}
if (&(get_int())) {}
// expected-warning@-1{{reference cannot be bound to dereferenced null pointer in well-defined C++ code; pointer may be assumed to always convert to true}}
if (!&get_int()) {}
// expected-warning@-1{{reference cannot be bound to dereferenced null pointer in well-defined C++ code; pointer may be assumed to always convert to true}}
if (&B::stat()) {}
// expected-warning@-1{{reference cannot be bound to dereferenced null pointer in well-defined C++ code; pointer may be assumed to always convert to true}}
if (&(B::stat())) {}
// expected-warning@-1{{reference cannot be bound to dereferenced null pointer in well-defined C++ code; pointer may be assumed to always convert to true}}
if (!&B::stat()) {}
// expected-warning@-1{{reference cannot be bound to dereferenced null pointer in well-defined C++ code; pointer may be assumed to always convert to true}}
B b;
if (&b.get()) {}
// expected-warning@-1{{reference cannot be bound to dereferenced null pointer in well-defined C++ code; pointer may be assumed to always convert to true}}
if (&(b.get())) {}
// expected-warning@-1{{reference cannot be bound to dereferenced null pointer in well-defined C++ code; pointer may be assumed to always convert to true}}
if (!&b.get()) {}
// expected-warning@-1{{reference cannot be bound to dereferenced null pointer in well-defined C++ code; pointer may be assumed to always convert to true}}
B* b_ptr = &b;
if (&b_ptr->get()) {}
// expected-warning@-1{{reference cannot be bound to dereferenced null pointer in well-defined C++ code; pointer may be assumed to always convert to true}}
if (&(b_ptr->get())) {}
// expected-warning@-1{{reference cannot be bound to dereferenced null pointer in well-defined C++ code; pointer may be assumed to always convert to true}}
if (!&b_ptr->get()) {}
// expected-warning@-1{{reference cannot be bound to dereferenced null pointer in well-defined C++ code; pointer may be assumed to always convert to true}}
int& (B::*m_ptr)() = &B::get;
if (&(b.*m_ptr)()) {}
// expected-warning@-1{{reference cannot be bound to dereferenced null pointer in well-defined C++ code; pointer may be assumed to always convert to true}}
if (&((b.*m_ptr)())) {}
// expected-warning@-1{{reference cannot be bound to dereferenced null pointer in well-defined C++ code; pointer may be assumed to always convert to true}}
if (!&(b.*m_ptr)()) {}
// expected-warning@-1{{reference cannot be bound to dereferenced null pointer in well-defined C++ code; pointer may be assumed to always convert to true}}
int& (*f_ptr)() = &get_int;
if (&(*f_ptr)()) {}
// expected-warning@-1{{reference cannot be bound to dereferenced null pointer in well-defined C++ code; pointer may be assumed to always convert to true}}
if (&((*f_ptr)())) {}
// expected-warning@-1{{reference cannot be bound to dereferenced null pointer in well-defined C++ code; pointer may be assumed to always convert to true}}
if (!&(*f_ptr)()) {}
// expected-warning@-1{{reference cannot be bound to dereferenced null pointer in well-defined C++ code; pointer may be assumed to always convert to true}}
}
}
namespace macros {
#define assert(x) if (x) {}
#define zero_on_null(x) ((x) ? *(x) : 0)
void test(int &x) {
// TODO: warn on assert(&x) but not on zero_on_null(&x)
zero_on_null(&x);
assert(zero_on_null(&x));
assert(&x);
assert(&x && "Expecting valid reference");
// expected-warning@-1{{reference cannot be bound to dereferenced null pointer in well-defined C++ code; pointer may be assumed to always convert to true}}
}
class S {
void test() {
assert(this);
assert(this && "Expecting invalid reference");
// expected-warning@-1{{'this' pointer cannot be null in well-defined C++ code; pointer may be assumed to always convert to true}}
}
};
}