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e15dd4e32e
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 git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@353086 91177308-0d34-0410-b5e6-96231b3b80d8
249 lines
8.9 KiB
C++
249 lines
8.9 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// <functional>
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// class function<R(ArgTypes...)>
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// function(Fp);
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// Ensure that __not_null works for all function types.
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// See https://bugs.llvm.org/show_bug.cgi?id=23589
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//------------------------------------------------------------------------------
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// TESTING std::function<...>::__not_null(Callable)
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//
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// Concerns:
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// 1) The call __not_null(Callable) is well formed and correct for each
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// possible 'Callable' type category. These categories include:
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// 1a) function pointers
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// 1b) member function pointer
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// 1c) member data pointer
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// 1d) callable class type
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// 1e) lambdas
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// Categories 1a, 1b, and 1c are 'Nullable' types. Only objects of these
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// types can be null. The other categories are not tested here.
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// 3) '__not_null(Callable)' is well formed when the call signature includes
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// varargs.
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// 4) '__not_null(Callable)' works for Callable types with all arities less
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// than or equal to 3 in C++03.
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// 5) '__not_null(Callable)' works when 'Callable' is a member function
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// pointer to a cv or ref qualified function type.
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//
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// Plan:
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// 1 For categories 1a, 1b and 1c define a set of
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// 'Callable' objects for this category. This set should include examples
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// of arity 0, 1, 2 and possible 3 including versions with varargs as the
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// last parameter.
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//
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// 2 For each 'Callable' object in categories 1a, 1b and 1c do the following.
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//
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// 1 Define a type 'std::function<Sig>' as 'F' where 'Sig' is compatible with
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// the signature of the 'Callable' object.
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//
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// 2 Create an object of type 'F' using a null pointer of type 'Callable'.
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// Check that 'F.target<Callable>()' is null.
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//
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// 3 Create an object of type 'F' that is not null. Check that
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// 'F.target<Callable>()' is not null and is equal to the original
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// argument.
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#include <functional>
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#include <type_traits>
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#include <cassert>
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#include "test_macros.h"
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///////////////////////////////////////////////////////////////////////////////
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int foo() { return 42; }
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int foo(int) { return 42; }
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int foo(int, int) { return 42; }
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int foo(int, int, int) { return 42; }
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int foo(...) { return 42; }
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int foo(int, ...) { return 42; }
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int foo(int, int, ...) { return 42; }
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int foo(int, int, int, ...) { return 42; }
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///////////////////////////////////////////////////////////////////////////////
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struct MemFun03 {
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int foo() { return 42; }
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int foo() const { return 42; }
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int foo() volatile { return 42; }
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int foo() const volatile { return 42; }
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int foo(int) { return 42; }
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int foo(int) const { return 42; }
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int foo(int) volatile { return 42; }
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int foo(int) const volatile { return 42; }
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int foo(int, int) { return 42; }
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int foo(int, int) const { return 42; }
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int foo(int, int) volatile { return 42; }
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int foo(int, int) const volatile { return 42; }
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int foo(int, int, int) { return 42; }
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int foo(int, int, int) const { return 42; }
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int foo(int, int, int) volatile { return 42; }
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int foo(int, int, int) const volatile { return 42; }
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int foo(...) { return 42; }
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int foo(...) const { return 42; }
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int foo(...) volatile { return 42; }
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int foo(...) const volatile { return 42; }
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int foo(int, ...) { return 42; }
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int foo(int, ...) const { return 42; }
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int foo(int, ...) volatile { return 42; }
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int foo(int, ...) const volatile { return 42; }
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int foo(int, int, ...) { return 42; }
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int foo(int, int, ...) const { return 42; }
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int foo(int, int, ...) volatile { return 42; }
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int foo(int, int, ...) const volatile { return 42; }
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int foo(int, int, int, ...) { return 42; }
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int foo(int, int, int, ...) const { return 42; }
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int foo(int, int, int, ...) volatile { return 42; }
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int foo(int, int, int, ...) const volatile { return 42; }
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};
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#if TEST_STD_VER >= 11
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struct MemFun11 {
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int foo() & { return 42; }
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int foo() const & { return 42; }
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int foo() volatile & { return 42; }
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int foo() const volatile & { return 42; }
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int foo(...) & { return 42; }
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int foo(...) const & { return 42; }
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int foo(...) volatile & { return 42; }
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int foo(...) const volatile & { return 42; }
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int foo() && { return 42; }
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int foo() const && { return 42; }
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int foo() volatile && { return 42; }
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int foo() const volatile && { return 42; }
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int foo(...) && { return 42; }
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int foo(...) const && { return 42; }
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int foo(...) volatile && { return 42; }
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int foo(...) const volatile && { return 42; }
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};
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#endif // TEST_STD_VER >= 11
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struct MemData {
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int foo;
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};
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// Create a non-null free function by taking the address of
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// &static_cast<Tp&>(foo);
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template <class Tp>
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struct Creator {
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static Tp create() {
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return &foo;
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}
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};
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// Create a non-null member pointer.
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template <class Ret, class Class>
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struct Creator<Ret Class::*> {
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typedef Ret Class::*ReturnType;
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static ReturnType create() {
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return &Class::foo;
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}
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};
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template <class TestFn, class Fn>
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void test_imp() {
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{ // Check that the null value is detected
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TestFn tf = nullptr;
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std::function<Fn> f = tf;
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assert(f.template target<TestFn>() == nullptr);
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}
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{ // Check that the non-null value is detected.
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TestFn tf = Creator<TestFn>::create();
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assert(tf != nullptr);
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std::function<Fn> f = tf;
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assert(f.template target<TestFn>() != nullptr);
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assert(*f.template target<TestFn>() == tf);
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}
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}
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void test_func() {
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test_imp<int(*)(), int()>();
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test_imp<int(*)(...), int()>();
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test_imp<int(*)(int), int(int)>();
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test_imp<int(*)(int, ...), int(int)>();
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test_imp<int(*)(int, int), int(int, int)>();
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test_imp<int(*)(int, int, ...), int(int, int)>();
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test_imp<int(*)(int, int, int), int(int, int, int)>();
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test_imp<int(*)(int, int, int, ...), int(int, int, int)>();
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}
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void test_mf() {
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test_imp<int(MemFun03::*)(), int(MemFun03&)>();
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test_imp<int(MemFun03::*)(...), int(MemFun03&)>();
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test_imp<int(MemFun03::*)() const, int(MemFun03&)>();
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test_imp<int(MemFun03::*)(...) const, int(MemFun03&)>();
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test_imp<int(MemFun03::*)() volatile, int(MemFun03&)>();
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test_imp<int(MemFun03::*)(...) volatile, int(MemFun03&)>();
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test_imp<int(MemFun03::*)() const volatile, int(MemFun03&)>();
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test_imp<int(MemFun03::*)(...) const volatile, int(MemFun03&)>();
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test_imp<int(MemFun03::*)(int), int(MemFun03&, int)>();
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test_imp<int(MemFun03::*)(int, ...), int(MemFun03&, int)>();
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test_imp<int(MemFun03::*)(int) const, int(MemFun03&, int)>();
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test_imp<int(MemFun03::*)(int, ...) const, int(MemFun03&, int)>();
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test_imp<int(MemFun03::*)(int) volatile, int(MemFun03&, int)>();
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test_imp<int(MemFun03::*)(int, ...) volatile, int(MemFun03&, int)>();
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test_imp<int(MemFun03::*)(int) const volatile, int(MemFun03&, int)>();
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test_imp<int(MemFun03::*)(int, ...) const volatile, int(MemFun03&, int)>();
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test_imp<int(MemFun03::*)(int, int), int(MemFun03&, int, int)>();
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test_imp<int(MemFun03::*)(int, int, ...), int(MemFun03&, int, int)>();
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test_imp<int(MemFun03::*)(int, int) const, int(MemFun03&, int, int)>();
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test_imp<int(MemFun03::*)(int, int, ...) const, int(MemFun03&, int, int)>();
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test_imp<int(MemFun03::*)(int, int) volatile, int(MemFun03&, int, int)>();
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test_imp<int(MemFun03::*)(int, int, ...) volatile, int(MemFun03&, int, int)>();
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test_imp<int(MemFun03::*)(int, int) const volatile, int(MemFun03&, int, int)>();
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test_imp<int(MemFun03::*)(int, int, ...) const volatile, int(MemFun03&, int, int)>();
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#if TEST_STD_VER >= 11
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test_imp<int(MemFun11::*)() &, int(MemFun11&)>();
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test_imp<int(MemFun11::*)(...) &, int(MemFun11&)>();
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test_imp<int(MemFun11::*)() const &, int(MemFun11&)>();
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test_imp<int(MemFun11::*)(...) const &, int(MemFun11&)>();
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test_imp<int(MemFun11::*)() volatile &, int(MemFun11&)>();
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test_imp<int(MemFun11::*)(...) volatile &, int(MemFun11&)>();
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test_imp<int(MemFun11::*)() const volatile &, int(MemFun11&)>();
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test_imp<int(MemFun11::*)(...) const volatile &, int(MemFun11&)>();
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test_imp<int(MemFun11::*)() &&, int(MemFun11&&)>();
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test_imp<int(MemFun11::*)(...) &&, int(MemFun11&&)>();
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test_imp<int(MemFun11::*)() const &&, int(MemFun11&&)>();
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test_imp<int(MemFun11::*)(...) const &&, int(MemFun11&&)>();
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test_imp<int(MemFun11::*)() volatile &&, int(MemFun11&&)>();
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test_imp<int(MemFun11::*)(...) volatile &&, int(MemFun11&&)>();
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test_imp<int(MemFun11::*)() const volatile &&, int(MemFun11&&)>();
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test_imp<int(MemFun11::*)(...) const volatile &&, int(MemFun11&&)>();
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#endif
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}
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void test_md() {
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test_imp<int MemData::*, int(MemData&)>();
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}
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int main(int, char**) {
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test_func();
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test_mf();
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test_md();
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return 0;
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}
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