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615e6dd1c5
We recently noticed that the unwrap_iter.h file was pushing macros, but
it was pushing them again instead of popping them at the end of the
file. This led to libc++ basically swallowing any custom definition of
these macros in user code:
#define min HELLO
#include <algorithm>
// min is not HELLO anymore, it's not defined
While investigating this issue, I noticed that our push/pop pragmas were
actually entirely wrong too. Indeed, instead of pushing macros like
`move`, we'd push `move(int, int)` in the pragma, which is not a valid
macro name. As a result, we would not actually push macros like `move`
-- instead we'd simply undefine them. This led to the following code not
working:
#define move HELLO
#include <algorithm>
// move is not HELLO anymore
Fixing the pragma push/pop incantations led to a cascade of issues
because we use identifiers like `move` in a large number of places, and
all of these headers would now need to do the push/pop dance.
This patch fixes all these issues. First, it adds a check that we don't
swallow important names like min, max, move or refresh as explained
above. This is done by augmenting the existing
system_reserved_names.gen.py test to also check that the macros are what
we expect after including each header.
Second, it fixes the push/pop pragmas to work properly and adds missing
pragmas to all the files I could detect a failure in via the newly added
test.
rdar://121365472
(cherry picked from commit 7b4622514d232ce5f7110dd8b20d90e81127c467)
82 lines
2.7 KiB
C++
82 lines
2.7 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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#ifndef _LIBCPP___ALGORITHM_RANGES_MIN_ELEMENT_H
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#define _LIBCPP___ALGORITHM_RANGES_MIN_ELEMENT_H
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#include <__config>
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#include <__functional/identity.h>
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#include <__functional/invoke.h>
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#include <__functional/ranges_operations.h>
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#include <__iterator/concepts.h>
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#include <__iterator/projected.h>
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#include <__ranges/access.h>
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#include <__ranges/concepts.h>
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#include <__ranges/dangling.h>
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#include <__utility/forward.h>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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_LIBCPP_PUSH_MACROS
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#include <__undef_macros>
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#if _LIBCPP_STD_VER >= 20
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_LIBCPP_BEGIN_NAMESPACE_STD
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namespace ranges {
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// TODO(ranges): `ranges::min_element` can now simply delegate to `std::__min_element`.
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template <class _Ip, class _Sp, class _Proj, class _Comp>
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_LIBCPP_HIDE_FROM_ABI constexpr _Ip __min_element_impl(_Ip __first, _Sp __last, _Comp& __comp, _Proj& __proj) {
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if (__first == __last)
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return __first;
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_Ip __i = __first;
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while (++__i != __last)
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if (std::invoke(__comp, std::invoke(__proj, *__i), std::invoke(__proj, *__first)))
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__first = __i;
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return __first;
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}
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namespace __min_element {
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struct __fn {
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template <forward_iterator _Ip,
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sentinel_for<_Ip> _Sp,
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class _Proj = identity,
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indirect_strict_weak_order<projected<_Ip, _Proj>> _Comp = ranges::less>
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_LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr _Ip
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operator()(_Ip __first, _Sp __last, _Comp __comp = {}, _Proj __proj = {}) const {
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return ranges::__min_element_impl(__first, __last, __comp, __proj);
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}
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template <forward_range _Rp,
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class _Proj = identity,
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indirect_strict_weak_order<projected<iterator_t<_Rp>, _Proj>> _Comp = ranges::less>
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_LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr borrowed_iterator_t<_Rp>
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operator()(_Rp&& __r, _Comp __comp = {}, _Proj __proj = {}) const {
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return ranges::__min_element_impl(ranges::begin(__r), ranges::end(__r), __comp, __proj);
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}
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};
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} // namespace __min_element
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inline namespace __cpo {
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inline constexpr auto min_element = __min_element::__fn{};
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} // namespace __cpo
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} // namespace ranges
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP_STD_VER >= 20
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_LIBCPP_POP_MACROS
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#endif // _LIBCPP___ALGORITHM_RANGES_MIN_ELEMENT_H
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