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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
105 lines
3.0 KiB
C++
105 lines
3.0 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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// <string_view>
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// constexpr const_iterator rend() const;
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#include <string_view>
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#include <cassert>
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#include <cstddef>
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#include "test_macros.h"
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template <class S>
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void
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test(S s)
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{
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const S& cs = s;
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typename S::reverse_iterator e = s.rend();
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typename S::const_reverse_iterator ce1 = cs.rend();
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typename S::const_reverse_iterator ce2 = s.crend();
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if (s.empty())
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{
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assert( e == s.rbegin());
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assert(ce1 == cs.rbegin());
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assert(ce2 == s.rbegin());
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}
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else
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{
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assert( e != s.rbegin());
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assert(ce1 != cs.rbegin());
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assert(ce2 != s.rbegin());
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}
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assert(static_cast<std::size_t>( e - s.rbegin()) == s.size());
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assert(static_cast<std::size_t>(ce1 - cs.rbegin()) == cs.size());
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assert(static_cast<std::size_t>(ce2 - s.crbegin()) == s.size());
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assert( e == ce1);
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assert( e == ce2);
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assert(ce1 == ce2);
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}
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int main(int, char**)
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{
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typedef std::string_view string_view;
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#if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
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typedef std::u8string_view u8string_view;
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#endif
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typedef std::u16string_view u16string_view;
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typedef std::u32string_view u32string_view;
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typedef std::wstring_view wstring_view;
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test(string_view ());
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test(u16string_view());
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test(u32string_view());
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test(wstring_view ());
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test(string_view ( "123"));
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test(wstring_view (L"123"));
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#if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
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test(u8string_view{u8"123"});
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#endif
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#if TEST_STD_VER >= 11
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test(u16string_view{u"123"});
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test(u32string_view{U"123"});
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#endif
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#if TEST_STD_VER > 14
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{
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constexpr string_view sv { "123", 3 };
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#if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
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constexpr u8string_view u8sv {u8"123", 3 };
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#endif
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constexpr u16string_view u16sv {u"123", 3 };
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constexpr u32string_view u32sv {U"123", 3 };
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constexpr wstring_view wsv {L"123", 3 };
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static_assert ( *--sv.rend() == sv[0], "" );
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#if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
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static_assert ( *--u8sv.rend() == u8sv[0], "" );
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#endif
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static_assert ( *--u16sv.rend() == u16sv[0], "" );
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static_assert ( *--u32sv.rend() == u32sv[0], "" );
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static_assert ( *--wsv.rend() == wsv[0], "" );
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static_assert ( *--sv.crend() == sv[0], "" );
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#if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
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static_assert ( *--u8sv.crend() == u8sv[0], "" );
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#endif
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static_assert ( *--u16sv.crend() == u16sv[0], "" );
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static_assert ( *--u32sv.crend() == u32sv[0], "" );
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static_assert ( *--wsv.crend() == wsv[0], "" );
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}
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#endif
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return 0;
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}
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