| // RUN: %clang_cc1 -fsyntax-only -verify %s |
| // RUN: %clang_cc1 -fsyntax-only -verify -Wtautological-undefined-compare %s |
| // RUN: %clang_cc1 -fsyntax-only -verify -Wno-tautological-compare -Wtautological-undefined-compare %s |
| // RUN: %clang_cc1 -fsyntax-only -verify -Wtautological-compare %s |
| |
| void test1(int &x) { |
| if (x == 1) { } |
| if (&x == 0) { } |
| // expected-warning@-1{{reference cannot be bound to dereferenced null pointer in well-defined C++ code; comparison may be assumed to always evaluate to false}} |
| if (&x != 0) { } |
| // expected-warning@-1{{reference cannot be bound to dereferenced null pointer in well-defined C++ code; comparison may be assumed to always evaluate to true}} |
| } |
| |
| class test2 { |
| test2() : x(y) {} |
| |
| void foo() { |
| if (this == 0) { } |
| // expected-warning@-1{{'this' pointer cannot be null in well-defined C++ code; comparison may be assumed to always evaluate to false}} |
| if (this != 0) { } |
| // expected-warning@-1{{'this' pointer cannot be null in well-defined C++ code; comparison may be assumed to always evaluate to true}} |
| } |
| |
| void bar() { |
| if (x == 1) { } |
| if (&x == 0) { } |
| // expected-warning@-1{{reference cannot be bound to dereferenced null pointer in well-defined C++ code; comparison may be assumed to always evaluate to false}} |
| if (&x != 0) { } |
| // expected-warning@-1{{reference cannot be bound to dereferenced null pointer in well-defined C++ code; comparison may be assumed to always evaluate to true}} |
| } |
| |
| int &x; |
| int y; |
| }; |
| |
| namespace function_return_reference { |
| int& get_int(); |
| // expected-note@-1 4{{'get_int' returns a reference}} |
| class B { |
| public: |
| static int &stat(); |
| // expected-note@-1 4{{'stat' returns a reference}} |
| int &get(); |
| // expected-note@-1 8{{'get' returns a reference}} |
| }; |
| |
| void test() { |
| if (&get_int() == 0) {} |
| // expected-warning@-1{{reference cannot be bound to dereferenced null pointer in well-defined C++ code; comparison may be assumed to always evaluate to false}} |
| if (&(get_int()) == 0) {} |
| // expected-warning@-1{{reference cannot be bound to dereferenced null pointer in well-defined C++ code; comparison may be assumed to always evaluate to false}} |
| |
| if (&get_int() != 0) {} |
| // expected-warning@-1{{reference cannot be bound to dereferenced null pointer in well-defined C++ code; comparison may be assumed to always evaluate to true}} |
| if (&(get_int()) != 0) {} |
| // expected-warning@-1{{reference cannot be bound to dereferenced null pointer in well-defined C++ code; comparison may be assumed to always evaluate to true}} |
| |
| if (&B::stat() == 0) {} |
| // expected-warning@-1{{reference cannot be bound to dereferenced null pointer in well-defined C++ code; comparison may be assumed to always evaluate to false}} |
| if (&(B::stat()) == 0) {} |
| // expected-warning@-1{{reference cannot be bound to dereferenced null pointer in well-defined C++ code; comparison may be assumed to always evaluate to false}} |
| |
| if (&B::stat() != 0) {} |
| // expected-warning@-1{{reference cannot be bound to dereferenced null pointer in well-defined C++ code; comparison may be assumed to always evaluate to true}} |
| if (&(B::stat()) != 0) {} |
| // expected-warning@-1{{reference cannot be bound to dereferenced null pointer in well-defined C++ code; comparison may be assumed to always evaluate to true}} |
| |
| B b; |
| if (&b.get() == 0) {} |
| // expected-warning@-1{{reference cannot be bound to dereferenced null pointer in well-defined C++ code; comparison may be assumed to always evaluate to false}} |
| if (&(b.get()) == 0) {} |
| // expected-warning@-1{{reference cannot be bound to dereferenced null pointer in well-defined C++ code; comparison may be assumed to always evaluate to false}} |
| |
| if (&b.get() != 0) {} |
| // expected-warning@-1{{reference cannot be bound to dereferenced null pointer in well-defined C++ code; comparison may be assumed to always evaluate to true}} |
| if (&(b.get()) != 0) {} |
| // expected-warning@-1{{reference cannot be bound to dereferenced null pointer in well-defined C++ code; comparison may be assumed to always evaluate to true}} |
| |
| B* b_ptr = &b; |
| if (&b_ptr->get() == 0) {} |
| // expected-warning@-1{{reference cannot be bound to dereferenced null pointer in well-defined C++ code; comparison may be assumed to always evaluate to false}} |
| if (&(b_ptr->get()) == 0) {} |
| // expected-warning@-1{{reference cannot be bound to dereferenced null pointer in well-defined C++ code; comparison may be assumed to always evaluate to false}} |
| |
| if (&b_ptr->get() != 0) {} |
| // expected-warning@-1{{reference cannot be bound to dereferenced null pointer in well-defined C++ code; comparison may be assumed to always evaluate to true}} |
| if (&(b_ptr->get()) != 0) {} |
| // expected-warning@-1{{reference cannot be bound to dereferenced null pointer in well-defined C++ code; comparison may be assumed to always evaluate to true}} |
| |
| int& (B::*m_ptr)() = &B::get; |
| if (&(b.*m_ptr)() == 0) {} |
| // expected-warning@-1{{reference cannot be bound to dereferenced null pointer in well-defined C++ code; comparison may be assumed to always evaluate to false}} |
| if (&((b.*m_ptr)()) == 0) {} |
| // expected-warning@-1{{reference cannot be bound to dereferenced null pointer in well-defined C++ code; comparison may be assumed to always evaluate to false}} |
| |
| if (&(b.*m_ptr)() != 0) {} |
| // expected-warning@-1{{reference cannot be bound to dereferenced null pointer in well-defined C++ code; comparison may be assumed to always evaluate to true}} |
| if (&((b.*m_ptr)()) != 0) {} |
| // expected-warning@-1{{reference cannot be bound to dereferenced null pointer in well-defined C++ code; comparison may be assumed to always evaluate to true}} |
| |
| int& (*f_ptr)() = &get_int; |
| if (&(*f_ptr)() == 0) {} |
| // expected-warning@-1{{reference cannot be bound to dereferenced null pointer in well-defined C++ code; comparison may be assumed to always evaluate to false}} |
| if (&((*f_ptr)()) == 0) {} |
| // expected-warning@-1{{reference cannot be bound to dereferenced null pointer in well-defined C++ code; comparison may be assumed to always evaluate to false}} |
| |
| if (&(*f_ptr)() != 0) {} |
| // expected-warning@-1{{reference cannot be bound to dereferenced null pointer in well-defined C++ code; comparison may be assumed to always evaluate to true}} |
| if (&((*f_ptr)()) != 0) {} |
| // expected-warning@-1{{reference cannot be bound to dereferenced null pointer in well-defined C++ code; comparison may be assumed to always evaluate to true}} |
| } |
| } |
| |
| namespace macros { |
| #define assert(x) if (x) {} |
| |
| void test(int &x) { |
| assert(&x != 0); |
| // expected-warning@-1{{reference cannot be bound to dereferenced null pointer in well-defined C++ code; comparison may be assumed to always evaluate to true}} |
| assert(&x == 0); |
| // expected-warning@-1{{reference cannot be bound to dereferenced null pointer in well-defined C++ code; comparison may be assumed to always evaluate to false}} |
| assert(&x != 0 && "Expecting valid reference"); |
| // expected-warning@-1{{reference cannot be bound to dereferenced null pointer in well-defined C++ code; comparison may be assumed to always evaluate to true}} |
| assert(&x == 0 && "Expecting invalid reference"); |
| // expected-warning@-1{{reference cannot be bound to dereferenced null pointer in well-defined C++ code; comparison may be assumed to always evaluate to false}} |
| } |
| |
| class S { |
| void test() { |
| assert(this != 0); |
| // expected-warning@-1{{'this' pointer cannot be null in well-defined C++ code; comparison may be assumed to always evaluate to true}} |
| assert(this == 0); |
| // expected-warning@-1{{'this' pointer cannot be null in well-defined C++ code; comparison may be assumed to always evaluate to false}} |
| assert(this != 0 && "Expecting valid reference"); |
| // expected-warning@-1{{'this' pointer cannot be null in well-defined C++ code; comparison may be assumed to always evaluate to true}} |
| assert(this == 0 && "Expecting invalid reference"); |
| // expected-warning@-1{{'this' pointer cannot be null in well-defined C++ code; comparison may be assumed to always evaluate to false}} |
| } |
| }; |
| } |
