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llvm-project/libcxx/test/std/utilities/function.objects/func.invoke/invoke.pass.cpp
JF Bastien 2df59c5068 Support tests in freestanding 
Summary:
Freestanding is *weird*. The standard allows it to differ in a bunch of odd
manners from regular C++, and the committee would like to improve that
situation. I'd like to make libc++ behave better with what freestanding should
be, so that it can be a tool we use in improving the standard. To do that we
need to try stuff out, both with "freestanding the language mode" and
"freestanding the library subset".

Let's start with the super basic: run the libc++ tests in freestanding, using
clang as the compiler, and see what works. The easiest hack to do this:

In utils/libcxx/test/config.py add:

  self.cxx.compile_flags += ['-ffreestanding']

Run the tests and they all fail.

Why? Because in freestanding `main` isn't special. This "not special" property
has two effects: main doesn't get mangled, and main isn't allowed to omit its
`return` statement. The first means main gets mangled and the linker can't
create a valid executable for us to test. The second means we spew out warnings
(ew) and the compiler doesn't insert the `return` we omitted, and main just
falls of the end and does whatever undefined behavior (if you're luck, ud2
leading to non-zero return code).

Let's start my work with the basics. This patch changes all libc++ tests to
declare `main` as `int main(int, char**` so it mangles consistently (enabling us
to declare another `extern "C"` main for freestanding which calls the mangled
one), and adds `return 0;` to all places where it was missing. This touches 6124
files, and I apologize.

The former was done with The Magic Of Sed.

The later was done with a (not quite correct but decent) clang tool:

  https://gist.github.com/jfbastien/793819ff360baa845483dde81170feed

This works for most tests, though I did have to adjust a few places when e.g.
the test runs with `-x c`, macros are used for main (such as for the filesystem
tests), etc.

Once this is in we can create a freestanding bot which will prevent further
regressions. After that, we can start the real work of supporting C++
freestanding fairly well in libc++.

<rdar://problem/47754795>

Reviewers: ldionne, mclow.lists, EricWF

Subscribers: christof, jkorous, dexonsmith, arphaman, miyuki, libcxx-commits

Differential Revision: https://reviews.llvm.org/D57624

llvm-svn: 353086
2019-02-04 20:31:13 +00:00

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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++98, c++03, c++11, c++14
// <functional>
// template <class F, class ...Args>
// result_of_t<F&&(Args&&...)> invoke(F&&, Args&&...);
/// C++14 [func.def] 20.9.0
/// (1) The following definitions apply to this Clause:
/// (2) A call signature is the name of a return type followed by a parenthesized
/// comma-separated list of zero or more argument types.
/// (3) A callable type is a function object type (20.9) or a pointer to member.
/// (4) A callable object is an object of a callable type.
/// (5) A call wrapper type is a type that holds a callable object and supports
/// a call operation that forwards to that object.
/// (6) A call wrapper is an object of a call wrapper type.
/// (7) A target object is the callable object held by a call wrapper.
/// C++14 [func.require] 20.9.1
///
/// Define INVOKE (f, t1, t2, ..., tN) as follows:
/// (1.1) - (t1.*f)(t2, ..., tN) when f is a pointer to a member function of a class T and t1 is an object of
/// type T or a reference to an object of type T or a reference to an object of a type derived from T;
/// (1.2) - ((*t1).*f)(t2, ..., tN) when f is a pointer to a member function of a class T and t1 is not one of
/// the types described in the previous item;
/// (1.3) - t1.*f when N == 1 and f is a pointer to member data of a class T and t1 is an object of type T or a
/// reference to an object of type T or a reference to an object of a type derived from T;
/// (1.4) - (*t1).*f when N == 1 and f is a pointer to member data of a class T and t1 is not one of the types
/// described in the previous item;
/// (1.5) - f(t1, t2, ..., tN) in all other cases.
#include <functional>
#include <type_traits>
#include <utility> // for std::move
#include <cassert>
struct NonCopyable {
NonCopyable() {}
private:
NonCopyable(NonCopyable const&) = delete;
NonCopyable& operator=(NonCopyable const&) = delete;
};
struct TestClass {
explicit TestClass(int x) : data(x) {}
int& operator()(NonCopyable&&) & { return data; }
int const& operator()(NonCopyable&&) const & { return data; }
int volatile& operator()(NonCopyable&&) volatile & { return data; }
int const volatile& operator()(NonCopyable&&) const volatile & { return data; }
int&& operator()(NonCopyable&&) && { return std::move(data); }
int const&& operator()(NonCopyable&&) const && { return std::move(data); }
int volatile&& operator()(NonCopyable&&) volatile && { return std::move(data); }
int const volatile&& operator()(NonCopyable&&) const volatile && { return std::move(data); }
int data;
private:
TestClass(TestClass const&) = delete;
TestClass& operator=(TestClass const&) = delete;
};
struct DerivedFromTestClass : public TestClass {
explicit DerivedFromTestClass(int x) : TestClass(x) {}
};
int& foo(NonCopyable&&) {
static int data = 42;
return data;
}
template <class Signature, class Expect, class Functor>
void test_b12(Functor&& f) {
// Create the callable object.
typedef Signature TestClass::*ClassFunc;
ClassFunc func_ptr = &TestClass::operator();
// Create the dummy arg.
NonCopyable arg;
// Check that the deduced return type of invoke is what is expected.
typedef decltype(
std::invoke(func_ptr, std::forward<Functor>(f), std::move(arg))
) DeducedReturnType;
static_assert((std::is_same<DeducedReturnType, Expect>::value), "");
// Check that result_of_t matches Expect.
typedef typename std::result_of<ClassFunc&&(Functor&&, NonCopyable&&)>::type
ResultOfReturnType;
static_assert((std::is_same<ResultOfReturnType, Expect>::value), "");
// Run invoke and check the return value.
DeducedReturnType ret =
std::invoke(func_ptr, std::forward<Functor>(f), std::move(arg));
assert(ret == 42);
}
template <class Expect, class Functor>
void test_b34(Functor&& f) {
// Create the callable object.
typedef int TestClass::*ClassFunc;
ClassFunc func_ptr = &TestClass::data;
// Check that the deduced return type of invoke is what is expected.
typedef decltype(
std::invoke(func_ptr, std::forward<Functor>(f))
) DeducedReturnType;
static_assert((std::is_same<DeducedReturnType, Expect>::value), "");
// Check that result_of_t matches Expect.
typedef typename std::result_of<ClassFunc&&(Functor&&)>::type
ResultOfReturnType;
static_assert((std::is_same<ResultOfReturnType, Expect>::value), "");
// Run invoke and check the return value.
DeducedReturnType ret =
std::invoke(func_ptr, std::forward<Functor>(f));
assert(ret == 42);
}
template <class Expect, class Functor>
void test_b5(Functor&& f) {
NonCopyable arg;
// Check that the deduced return type of invoke is what is expected.
typedef decltype(
std::invoke(std::forward<Functor>(f), std::move(arg))
) DeducedReturnType;
static_assert((std::is_same<DeducedReturnType, Expect>::value), "");
// Check that result_of_t matches Expect.
typedef typename std::result_of<Functor&&(NonCopyable&&)>::type
ResultOfReturnType;
static_assert((std::is_same<ResultOfReturnType, Expect>::value), "");
// Run invoke and check the return value.
DeducedReturnType ret = std::invoke(std::forward<Functor>(f), std::move(arg));
assert(ret == 42);
}
void bullet_one_two_tests() {
{
TestClass cl(42);
test_b12<int&(NonCopyable&&) &, int&>(cl);
test_b12<int const&(NonCopyable&&) const &, int const&>(cl);
test_b12<int volatile&(NonCopyable&&) volatile &, int volatile&>(cl);
test_b12<int const volatile&(NonCopyable&&) const volatile &, int const volatile&>(cl);
test_b12<int&&(NonCopyable&&) &&, int&&>(std::move(cl));
test_b12<int const&&(NonCopyable&&) const &&, int const&&>(std::move(cl));
test_b12<int volatile&&(NonCopyable&&) volatile &&, int volatile&&>(std::move(cl));
test_b12<int const volatile&&(NonCopyable&&) const volatile &&, int const volatile&&>(std::move(cl));
}
{
DerivedFromTestClass cl(42);
test_b12<int&(NonCopyable&&) &, int&>(cl);
test_b12<int const&(NonCopyable&&) const &, int const&>(cl);
test_b12<int volatile&(NonCopyable&&) volatile &, int volatile&>(cl);
test_b12<int const volatile&(NonCopyable&&) const volatile &, int const volatile&>(cl);
test_b12<int&&(NonCopyable&&) &&, int&&>(std::move(cl));
test_b12<int const&&(NonCopyable&&) const &&, int const&&>(std::move(cl));
test_b12<int volatile&&(NonCopyable&&) volatile &&, int volatile&&>(std::move(cl));
test_b12<int const volatile&&(NonCopyable&&) const volatile &&, int const volatile&&>(std::move(cl));
}
{
TestClass cl_obj(42);
std::reference_wrapper<TestClass> cl(cl_obj);
test_b12<int&(NonCopyable&&) &, int&>(cl);
test_b12<int const&(NonCopyable&&) const &, int const&>(cl);
test_b12<int volatile&(NonCopyable&&) volatile &, int volatile&>(cl);
test_b12<int const volatile&(NonCopyable&&) const volatile &, int const volatile&>(cl);
test_b12<int&(NonCopyable&&) &, int&>(std::move(cl));
test_b12<int const&(NonCopyable&&) const &, int const&>(std::move(cl));
test_b12<int volatile&(NonCopyable&&) volatile &, int volatile&>(std::move(cl));
test_b12<int const volatile&(NonCopyable&&) const volatile &, int const volatile&>(std::move(cl));
}
{
DerivedFromTestClass cl_obj(42);
std::reference_wrapper<DerivedFromTestClass> cl(cl_obj);
test_b12<int&(NonCopyable&&) &, int&>(cl);
test_b12<int const&(NonCopyable&&) const &, int const&>(cl);
test_b12<int volatile&(NonCopyable&&) volatile &, int volatile&>(cl);
test_b12<int const volatile&(NonCopyable&&) const volatile &, int const volatile&>(cl);
test_b12<int&(NonCopyable&&) &, int&>(std::move(cl));
test_b12<int const&(NonCopyable&&) const &, int const&>(std::move(cl));
test_b12<int volatile&(NonCopyable&&) volatile &, int volatile&>(std::move(cl));
test_b12<int const volatile&(NonCopyable&&) const volatile &, int const volatile&>(std::move(cl));
}
{
TestClass cl_obj(42);
TestClass *cl = &cl_obj;
test_b12<int&(NonCopyable&&) &, int&>(cl);
test_b12<int const&(NonCopyable&&) const &, int const&>(cl);
test_b12<int volatile&(NonCopyable&&) volatile &, int volatile&>(cl);
test_b12<int const volatile&(NonCopyable&&) const volatile &, int const volatile&>(cl);
}
{
DerivedFromTestClass cl_obj(42);
DerivedFromTestClass *cl = &cl_obj;
test_b12<int&(NonCopyable&&) &, int&>(cl);
test_b12<int const&(NonCopyable&&) const &, int const&>(cl);
test_b12<int volatile&(NonCopyable&&) volatile &, int volatile&>(cl);
test_b12<int const volatile&(NonCopyable&&) const volatile &, int const volatile&>(cl);
}
}
void bullet_three_four_tests() {
{
typedef TestClass Fn;
Fn cl(42);
test_b34<int&>(cl);
test_b34<int const&>(static_cast<Fn const&>(cl));
test_b34<int volatile&>(static_cast<Fn volatile&>(cl));
test_b34<int const volatile&>(static_cast<Fn const volatile &>(cl));
test_b34<int&&>(static_cast<Fn &&>(cl));
test_b34<int const&&>(static_cast<Fn const&&>(cl));
test_b34<int volatile&&>(static_cast<Fn volatile&&>(cl));
test_b34<int const volatile&&>(static_cast<Fn const volatile&&>(cl));
}
{
typedef DerivedFromTestClass Fn;
Fn cl(42);
test_b34<int&>(cl);
test_b34<int const&>(static_cast<Fn const&>(cl));
test_b34<int volatile&>(static_cast<Fn volatile&>(cl));
test_b34<int const volatile&>(static_cast<Fn const volatile &>(cl));
test_b34<int&&>(static_cast<Fn &&>(cl));
test_b34<int const&&>(static_cast<Fn const&&>(cl));
test_b34<int volatile&&>(static_cast<Fn volatile&&>(cl));
test_b34<int const volatile&&>(static_cast<Fn const volatile&&>(cl));
}
{
typedef TestClass Fn;
Fn cl(42);
test_b34<int&>(std::reference_wrapper<Fn>(cl));
test_b34<int const&>(std::reference_wrapper<Fn const>(cl));
test_b34<int volatile&>(std::reference_wrapper<Fn volatile>(cl));
test_b34<int const volatile&>(std::reference_wrapper<Fn const volatile>(cl));
}
{
typedef DerivedFromTestClass Fn;
Fn cl(42);
test_b34<int&>(std::reference_wrapper<Fn>(cl));
test_b34<int const&>(std::reference_wrapper<Fn const>(cl));
test_b34<int volatile&>(std::reference_wrapper<Fn volatile>(cl));
test_b34<int const volatile&>(std::reference_wrapper<Fn const volatile>(cl));
}
{
typedef TestClass Fn;
Fn cl_obj(42);
Fn* cl = &cl_obj;
test_b34<int&>(cl);
test_b34<int const&>(static_cast<Fn const*>(cl));
test_b34<int volatile&>(static_cast<Fn volatile*>(cl));
test_b34<int const volatile&>(static_cast<Fn const volatile *>(cl));
}
{
typedef DerivedFromTestClass Fn;
Fn cl_obj(42);
Fn* cl = &cl_obj;
test_b34<int&>(cl);
test_b34<int const&>(static_cast<Fn const*>(cl));
test_b34<int volatile&>(static_cast<Fn volatile*>(cl));
test_b34<int const volatile&>(static_cast<Fn const volatile *>(cl));
}
}
void bullet_five_tests() {
using FooType = int&(NonCopyable&&);
{
FooType& fn = foo;
test_b5<int &>(fn);
}
{
FooType* fn = foo;
test_b5<int &>(fn);
}
{
typedef TestClass Fn;
Fn cl(42);
test_b5<int&>(cl);
test_b5<int const&>(static_cast<Fn const&>(cl));
test_b5<int volatile&>(static_cast<Fn volatile&>(cl));
test_b5<int const volatile&>(static_cast<Fn const volatile &>(cl));
test_b5<int&&>(static_cast<Fn &&>(cl));
test_b5<int const&&>(static_cast<Fn const&&>(cl));
test_b5<int volatile&&>(static_cast<Fn volatile&&>(cl));
test_b5<int const volatile&&>(static_cast<Fn const volatile&&>(cl));
}
}
struct CopyThrows {
CopyThrows() {}
CopyThrows(CopyThrows const&) {}
CopyThrows(CopyThrows&&) noexcept {}
};
struct NoThrowCallable {
void operator()() noexcept {}
void operator()(CopyThrows) noexcept {}
};
struct ThrowsCallable {
void operator()() {}
};
struct MemberObj {
int x;
};
void noexcept_test() {
{
NoThrowCallable obj; ((void)obj); // suppress unused warning
CopyThrows arg; ((void)arg); // suppress unused warning
static_assert(noexcept(std::invoke(obj)), "");
static_assert(!noexcept(std::invoke(obj, arg)), "");
static_assert(noexcept(std::invoke(obj, std::move(arg))), "");
}
{
ThrowsCallable obj; ((void)obj); // suppress unused warning
static_assert(!noexcept(std::invoke(obj)), "");
}
{
MemberObj obj{42}; ((void)obj); // suppress unused warning.
static_assert(noexcept(std::invoke(&MemberObj::x, obj)), "");
}
}
int main(int, char**) {
bullet_one_two_tests();
bullet_three_four_tests();
bullet_five_tests();
noexcept_test();
return 0;
}
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