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df963a38a9
This doesn't affect our code generation in any material way -- we already give such declarations internal linkage from a codegen perspective -- but it has some subtle effects on code validity. We suppress the 'L' (internal linkage) marker for mangled names in anonymous namespaces, because it is redundant (the information is already carried by the namespace); this deviates from GCC's behavior if a variable or function in an anonymous namespace is redundantly declared 'static' (where GCC does include the 'L'), but GCC's behavior is incoherent because such a declaration can be validly declared with or without the 'static'. We still deviate from the standard in one regard here: extern "C" declarations in anonymous namespaces are still granted external linkage. Changing those does not appear to have been an intentional consequence of the standard change in DR1113. llvm-svn: 314037
356 lines
11 KiB
C++
356 lines
11 KiB
C++
// RUN: %clang_cc1 -fsyntax-only -verify -Wbind-to-temporary-copy %s
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// RUN: %clang_cc1 -fsyntax-only -verify -Wbind-to-temporary-copy -std=c++98 %s
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// RUN: %clang_cc1 -fsyntax-only -verify -Wbind-to-temporary-copy -std=c++11 %s
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// Make sure we don't produce invalid IR.
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// RUN: %clang_cc1 -emit-llvm-only %s
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// RUN: %clang_cc1 -emit-llvm-only -std=c++98 %s
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// RUN: %clang_cc1 -emit-llvm-only -std=c++11 %s
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namespace test1 {
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static void foo(); // expected-warning {{function 'test1::foo' has internal linkage but is not defined}}
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template <class T> static void bar(); // expected-warning {{function 'test1::bar<int>' has internal linkage but is not defined}}
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void test() {
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foo(); // expected-note {{used here}}
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bar<int>(); // expected-note {{used here}}
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}
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}
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namespace test2 {
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namespace {
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void foo(); // expected-warning {{function 'test2::(anonymous namespace)::foo' has internal linkage but is not defined}}
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extern int var; // expected-warning {{variable 'test2::(anonymous namespace)::var' has internal linkage but is not defined}}
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template <class T> void bar(); // expected-warning {{function 'test2::(anonymous namespace)::bar<int>' has internal linkage but is not defined}}
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}
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void test() {
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foo(); // expected-note {{used here}}
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var = 0; // expected-note {{used here}}
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bar<int>(); // expected-note {{used here}}
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}
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}
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namespace test3 {
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namespace {
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void foo();
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extern int var;
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template <class T> void bar();
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}
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void test() {
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foo();
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var = 0;
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bar<int>();
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}
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namespace {
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void foo() {}
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int var = 0;
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template <class T> void bar() {}
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}
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}
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namespace test4 {
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namespace {
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struct A {
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A(); // expected-warning {{function 'test4::(anonymous namespace)::A::A' has internal linkage but is not defined}}
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~A();// expected-warning {{function 'test4::(anonymous namespace)::A::~A' has internal linkage but is not defined}}
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virtual void foo(); // expected-warning {{function 'test4::(anonymous namespace)::A::foo' has internal linkage but is not defined}}
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virtual void bar() = 0;
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virtual void baz(); // expected-warning {{function 'test4::(anonymous namespace)::A::baz' has internal linkage but is not defined}}
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};
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}
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void test(A &a) {
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a.foo(); // expected-note {{used here}}
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a.bar();
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a.baz(); // expected-note {{used here}}
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}
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struct Test : A {
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Test() {} // expected-note 2 {{used here}}
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};
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}
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// rdar://problem/9014651
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namespace test5 {
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namespace {
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struct A {};
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}
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template <class N> struct B {
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static int var; // expected-warning {{variable 'test5::B<test5::(anonymous namespace)::A>::var' has internal linkage but is not defined}}
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static void foo(); // expected-warning {{function 'test5::B<test5::(anonymous namespace)::A>::foo' has internal linkage but is not defined}}
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};
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extern template int B<A>::var;
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void test() {
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B<A>::var = 0; // expected-note {{used here}}
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B<A>::foo(); // expected-note {{used here}}
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}
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}
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namespace test6 {
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template <class T> struct A {
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static const int zero = 0;
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static const int one = 1;
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static const int two = 2;
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int value;
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A() : value(zero) {
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value = one;
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}
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};
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namespace { struct Internal; }
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void test() {
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A<Internal> a;
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a.value = A<Internal>::two;
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}
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}
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// We support (as an extension) private, undefined copy constructors when
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// a temporary is bound to a reference even in C++98. Similarly, we shouldn't
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// warn about this copy constructor being used without a definition.
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namespace PR9323 {
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namespace {
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struct Uncopyable {
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Uncopyable() {}
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private:
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Uncopyable(const Uncopyable&); // expected-note {{declared private here}}
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};
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}
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void f(const Uncopyable&) {}
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void test() {
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f(Uncopyable());
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#if __cplusplus <= 199711L // C++03 or earlier modes
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// expected-warning@-2 {{C++98 requires an accessible copy constructor}}
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#else
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// expected-warning@-4 {{copying parameter of type 'PR9323::(anonymous namespace)::Uncopyable' when binding a reference to a temporary would invoke an inaccessible constructor in C++98}}
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#endif
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};
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}
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namespace std { class type_info; };
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namespace cxx11_odr_rules {
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// Note: the way this test is written isn't really ideal, but there really
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// isn't any other way to check that the odr-used logic for constants
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// is working without working implicit capture in lambda-expressions.
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// (The more accurate used-but-not-defined warning is the only other visible
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// effect of accurate odr-used computation.)
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//
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// Note that the warning in question can trigger in cases some people would
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// consider false positives; hopefully that happens rarely in practice.
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//
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// FIXME: Suppressing this test while I figure out how to fix a bug in the
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// odr-use marking code.
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namespace {
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struct A {
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static const int unused = 10;
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static const int used1 = 20; // xpected-warning {{internal linkage}}
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static const int used2 = 20; // xpected-warning {{internal linkage}}
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virtual ~A() {}
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};
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}
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void a(int,int);
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A& p(const int&) { static A a; return a; }
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// Check handling of default arguments
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void b(int = A::unused);
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void tests() {
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// Basic test
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a(A::unused, A::unused);
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// Check that nesting an unevaluated or constant-evaluated context does
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// the right thing.
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a(A::unused, sizeof(int[10]));
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// Check that the checks work with unevaluated contexts
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(void)sizeof(p(A::used1));
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(void)typeid(p(A::used1)); // expected-warning {{expression with side effects will be evaluated despite being used as an operand to 'typeid'}} xpected-note {{used here}}
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// Misc other testing
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a(A::unused, 1 ? A::used2 : A::used2); // xpected-note {{used here}}
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b();
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}
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}
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namespace OverloadUse {
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namespace {
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void f();
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void f(int); // expected-warning {{function 'OverloadUse::(anonymous namespace)::f' has internal linkage but is not defined}}
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void f(int, int); // expected-warning {{function 'OverloadUse::(anonymous namespace)::f' has internal linkage but is not defined}}
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#if __cplusplus < 201103L
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// expected-note@-3 {{here}}
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// expected-note@-3 {{here}}
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#endif
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}
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template<void x()> void t() { x(); }
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template<void x(int)> void t(int*) { x(10); }
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template<void x(int, int)> void t(int*, int*) {}
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void g(int n) {
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t<f>(&n); // expected-note {{used here}}
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t<f>(&n, &n); // expected-note {{used here}}
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#if __cplusplus < 201103L
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// expected-warning@-3 {{non-type template argument referring to function 'f' with internal linkage}}
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// expected-warning@-3 {{non-type template argument referring to function 'f' with internal linkage}}
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#endif
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}
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}
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namespace test7 {
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typedef struct {
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void bar();
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void foo() {
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bar();
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}
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} A;
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}
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namespace test8 {
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typedef struct {
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void bar(); // expected-warning {{function 'test8::(anonymous struct)::bar' has internal linkage but is not defined}}
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void foo() {
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bar(); // expected-note {{used here}}
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}
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} *A;
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}
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namespace test9 {
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namespace {
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struct X {
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virtual void notused() = 0;
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virtual void used() = 0; // expected-warning {{function 'test9::(anonymous namespace)::X::used' has internal linkage but is not defined}}
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};
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}
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void test(X &x) {
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x.notused();
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x.X::used(); // expected-note {{used here}}
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}
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}
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namespace test10 {
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namespace {
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struct X {
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virtual void notused() = 0;
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virtual void used() = 0; // expected-warning {{function 'test10::(anonymous namespace)::X::used' has internal linkage but is not defined}}
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void test() {
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notused();
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(void)&X::notused;
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(this->*&X::notused)();
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X::used(); // expected-note {{used here}}
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}
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};
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struct Y : X {
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using X::notused;
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};
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}
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}
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namespace test11 {
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namespace {
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struct A {
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virtual bool operator()() const = 0;
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virtual void operator!() const = 0;
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virtual bool operator+(const A&) const = 0;
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virtual int operator[](int) const = 0;
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virtual const A* operator->() const = 0;
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int member;
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};
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struct B {
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bool operator()() const; // expected-warning {{function 'test11::(anonymous namespace)::B::operator()' has internal linkage but is not defined}}
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void operator!() const; // expected-warning {{function 'test11::(anonymous namespace)::B::operator!' has internal linkage but is not defined}}
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bool operator+(const B&) const; // expected-warning {{function 'test11::(anonymous namespace)::B::operator+' has internal linkage but is not defined}}
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int operator[](int) const; // expected-warning {{function 'test11::(anonymous namespace)::B::operator[]' has internal linkage but is not defined}}
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const B* operator->() const; // expected-warning {{function 'test11::(anonymous namespace)::B::operator->' has internal linkage but is not defined}}
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int member;
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};
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}
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void test1(A &a1, A &a2) {
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a1();
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!a1;
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a1 + a2;
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a1[0];
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(void)a1->member;
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}
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void test2(B &b1, B &b2) {
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b1(); // expected-note {{used here}}
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!b1; // expected-note {{used here}}
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b1 + b2; // expected-note {{used here}}
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b1[0]; // expected-note {{used here}}
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(void)b1->member; // expected-note {{used here}}
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}
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}
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namespace test12 {
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class T1 {}; class T2 {}; class T3 {}; class T4 {}; class T5 {}; class T6 {};
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class T7 {};
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namespace {
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struct Cls {
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virtual void f(int) = 0;
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virtual void f(int, double) = 0;
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void g(int); // expected-warning {{function 'test12::(anonymous namespace)::Cls::g' has internal linkage but is not defined}}
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void g(int, double);
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virtual operator T1() = 0;
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virtual operator T2() = 0;
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virtual operator T3&() = 0;
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operator T4(); // expected-warning {{function 'test12::(anonymous namespace)::Cls::operator T4' has internal linkage but is not defined}}
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operator T5(); // expected-warning {{function 'test12::(anonymous namespace)::Cls::operator T5' has internal linkage but is not defined}}
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operator T6&(); // expected-warning {{function 'test12::(anonymous namespace)::Cls::operator test12::T6 &' has internal linkage but is not defined}}
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};
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struct Cls2 {
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Cls2(T7); // expected-warning {{function 'test12::(anonymous namespace)::Cls2::Cls2' has internal linkage but is not defined}}
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};
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}
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void test(Cls &c) {
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c.f(7);
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c.g(7); // expected-note {{used here}}
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(void)static_cast<T1>(c);
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T2 t2 = c;
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T3 &t3 = c;
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(void)static_cast<T4>(c); // expected-note {{used here}}
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T5 t5 = c; // expected-note {{used here}}
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T6 &t6 = c; // expected-note {{used here}}
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Cls2 obj1((T7())); // expected-note {{used here}}
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}
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}
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namespace test13 {
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namespace {
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struct X {
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virtual void f() { }
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};
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struct Y : public X {
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virtual void f() = 0;
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virtual void g() {
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X::f();
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}
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};
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}
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}
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namespace test14 {
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extern "C" const int foo;
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int f() {
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return foo;
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}
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}
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