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