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fba942641e
The newer version of clang will issue warnings in more cases, specifically, -Winvalid-offsetof and -Wunused-but-set-variable. This cleans up the new warnings issued from header, which shows up for every TU that includes them. Fixing them should make the remaining warnings easier to read.
63 lines
1.8 KiB
C++
63 lines
1.8 KiB
C++
//===--- HeaderFooterLayout.h -----------------------------------*- C++ -*-===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2024 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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#ifndef SWIFT_BASIC_HEADER_FOOTER_LAYOUT_H
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#define SWIFT_BASIC_HEADER_FOOTER_LAYOUT_H
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#include <cstddef>
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namespace swift {
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template <class T>
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class size_without_trailing_padding {
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struct ExtraByte { char _size_without_trailing_padding_probe; };
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struct Probe: T, ExtraByte {};
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public:
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#pragma clang diagnostic push
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#pragma clang diagnostic ignored "-Winvalid-offsetof"
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enum { value = offsetof(Probe, _size_without_trailing_padding_probe) };
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#pragma clang diagnostic pop
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};
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namespace detail {
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template <ptrdiff_t size>
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struct LayoutPadding {
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char padding[size];
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};
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template <>
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struct LayoutPadding<0> {};
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template <class Header, class Footer, size_t TotalSize>
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struct HeaderFooterLayoutPaddingSize {
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enum : ptrdiff_t {
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maxFooterOffset = TotalSize - (ptrdiff_t)size_without_trailing_padding<Footer>::value,
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footerAlignment = (ptrdiff_t)alignof(Footer),
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footerOffset = maxFooterOffset - (maxFooterOffset % footerAlignment),
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value = footerOffset - (ptrdiff_t)size_without_trailing_padding<Header>::value
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};
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};
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} // namespace detail
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template <class Header, class Footer, size_t TotalSize>
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struct HeaderFooterLayout
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: Header,
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detail::LayoutPadding<detail::HeaderFooterLayoutPaddingSize<
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Header, Footer, TotalSize>::value>,
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Footer {};
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} // namespace swift
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#endif // SWIFT_BASIC_HEADER_FOOTER_LAYOUT_H
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