mirror of
https://github.com/llvm-mirror/libcxx.git
synced 2025-10-21 15:10:37 +08:00
272871b658
Summary: Starting in Clang 8.0 and GCC 8.0, `alignof` and `__alignof` return different values in same cases. Specifically `alignof` and `_Alignof` return the minimum alignment for a type, where as `__alignof` returns the preferred alignment. libc++ currently uses `__alignof` but means to use `alignof`. See llvm.org/PR39713 This patch introduces the macro `_LIBCPP_ALIGNOF` so we can control which spelling gets used. This patch does not introduce any ABI guard to provide the old behavior with newer compilers. However, if we decide that is needed, this patch makes it trivial to implement. I think we should commit this change immediately, and decide what we want to do about the ABI afterwards. Reviewers: ldionne, EricWF Reviewed By: ldionne, EricWF Subscribers: jyknight, christof, libcxx-commits Differential Revision: https://reviews.llvm.org/D54814 git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@351289 91177308-0d34-0410-b5e6-96231b3b80d8
313 lines
8.8 KiB
C++
313 lines
8.8 KiB
C++
// -*- C++ -*-
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//===---------------------------- test_macros.h ---------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#ifndef SUPPORT_TEST_MACROS_HPP
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#define SUPPORT_TEST_MACROS_HPP
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#include <ciso646> // Get STL specific macros like _LIBCPP_VERSION
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#if defined(__GNUC__)
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wvariadic-macros"
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#endif
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#define TEST_CONCAT1(X, Y) X##Y
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#define TEST_CONCAT(X, Y) TEST_CONCAT1(X, Y)
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#ifdef __has_feature
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#define TEST_HAS_FEATURE(X) __has_feature(X)
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#else
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#define TEST_HAS_FEATURE(X) 0
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#endif
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#ifndef __has_include
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#define __has_include(...) 0
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#endif
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#ifdef __has_extension
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#define TEST_HAS_EXTENSION(X) __has_extension(X)
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#else
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#define TEST_HAS_EXTENSION(X) 0
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#endif
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#ifdef __has_builtin
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#define TEST_HAS_BUILTIN(X) __has_builtin(X)
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#else
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#define TEST_HAS_BUILTIN(X) 0
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#endif
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#ifdef __is_identifier
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// '__is_identifier' returns '0' if '__x' is a reserved identifier provided by
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// the compiler and '1' otherwise.
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#define TEST_HAS_BUILTIN_IDENTIFIER(X) !__is_identifier(X)
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#else
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#define TEST_HAS_BUILTIN_IDENTIFIER(X) 0
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#endif
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#if defined(__EDG__)
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# define TEST_COMPILER_EDG
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#elif defined(__clang__)
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# define TEST_COMPILER_CLANG
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# if defined(__apple_build_version__)
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# define TEST_COMPILER_APPLE_CLANG
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# endif
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#elif defined(_MSC_VER)
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# define TEST_COMPILER_C1XX
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#elif defined(__GNUC__)
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# define TEST_COMPILER_GCC
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#endif
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#if defined(__apple_build_version__)
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#define TEST_APPLE_CLANG_VER (__clang_major__ * 100) + __clang_minor__
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#elif defined(__clang_major__)
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#define TEST_CLANG_VER (__clang_major__ * 100) + __clang_minor__
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#elif defined(__GNUC__)
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#define TEST_GCC_VER (__GNUC__ * 100 + __GNUC_MINOR__)
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#define TEST_GCC_VER_NEW (TEST_GCC_VER * 10 + __GNUC_PATCHLEVEL__)
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#endif
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/* Make a nice name for the standard version */
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#ifndef TEST_STD_VER
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#if __cplusplus <= 199711L
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# define TEST_STD_VER 3
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#elif __cplusplus <= 201103L
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# define TEST_STD_VER 11
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#elif __cplusplus <= 201402L
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# define TEST_STD_VER 14
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#elif __cplusplus <= 201703L
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# define TEST_STD_VER 17
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#else
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# define TEST_STD_VER 99 // greater than current standard
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// This is deliberately different than _LIBCPP_STD_VER to discourage matching them up.
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#endif
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#endif
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// Attempt to deduce the GLIBC version
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#if (defined(__has_include) && __has_include(<features.h>)) || \
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defined(__linux__)
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#include <features.h>
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#if defined(__GLIBC_PREREQ)
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#define TEST_HAS_GLIBC
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#define TEST_GLIBC_PREREQ(major, minor) __GLIBC_PREREQ(major, minor)
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#endif
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#endif
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#if TEST_STD_VER >= 11
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#define TEST_ALIGNOF(...) alignof(__VA_ARGS__)
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#define TEST_ALIGNAS(...) alignas(__VA_ARGS__)
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#define TEST_CONSTEXPR constexpr
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#define TEST_NOEXCEPT noexcept
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#define TEST_NOEXCEPT_FALSE noexcept(false)
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#define TEST_NOEXCEPT_COND(...) noexcept(__VA_ARGS__)
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# if TEST_STD_VER >= 14
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# define TEST_CONSTEXPR_CXX14 constexpr
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# else
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# define TEST_CONSTEXPR_CXX14
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# endif
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# if TEST_STD_VER > 14
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# define TEST_THROW_SPEC(...)
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# else
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# define TEST_THROW_SPEC(...) throw(__VA_ARGS__)
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# endif
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#else
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#if defined(TEST_COMPILER_CLANG)
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# define TEST_ALIGNOF(...) _Alignof(__VA_ARGS__)
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#else
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# define TEST_ALIGNOF(...) __alignof(__VA_ARGS__)
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#endif
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#define TEST_ALIGNAS(...) __attribute__((__aligned__(__VA_ARGS__)))
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#define TEST_CONSTEXPR
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#define TEST_CONSTEXPR_CXX14
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#define TEST_NOEXCEPT throw()
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#define TEST_NOEXCEPT_FALSE
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#define TEST_NOEXCEPT_COND(...)
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#define TEST_THROW_SPEC(...) throw(__VA_ARGS__)
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#endif
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// Sniff out to see if the underling C library has C11 features
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// Note that at this time (July 2018), MacOS X and iOS do NOT.
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// This is cribbed from __config; but lives here as well because we can't assume libc++
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#if __ISO_C_VISIBLE >= 2011 || TEST_STD_VER >= 11
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# if defined(__FreeBSD__)
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// Specifically, FreeBSD does NOT have timespec_get, even though they have all
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// the rest of C11 - this is PR#38495
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# define TEST_HAS_C11_FEATURES
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# elif defined(__Fuchsia__)
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# define TEST_HAS_C11_FEATURES
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# define TEST_HAS_TIMESPEC_GET
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# elif defined(__linux__)
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// This block preserves the old behavior used by include/__config:
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// _LIBCPP_GLIBC_PREREQ would be defined to 0 if __GLIBC_PREREQ was not
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// available. The configuration here may be too vague though, as Bionic, uClibc,
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// newlib, etc may all support these features but need to be configured.
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# if defined(TEST_GLIBC_PREREQ)
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# if TEST_GLIBC_PREREQ(2, 17)
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# define TEST_HAS_TIMESPEC_GET
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# define TEST_HAS_C11_FEATURES
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# endif
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# elif defined(_LIBCPP_HAS_MUSL_LIBC)
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# define TEST_HAS_C11_FEATURES
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# define TEST_HAS_TIMESPEC_GET
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# endif
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# elif defined(_WIN32)
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# if defined(_MSC_VER) && !defined(__MINGW32__)
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# define TEST_HAS_C11_FEATURES // Using Microsoft's C Runtime library
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# define TEST_HAS_TIMESPEC_GET
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# endif
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# endif
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#endif
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/* Features that were introduced in C++14 */
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#if TEST_STD_VER >= 14
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#define TEST_HAS_EXTENDED_CONSTEXPR
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#define TEST_HAS_VARIABLE_TEMPLATES
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#endif
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/* Features that were introduced in C++17 */
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#if TEST_STD_VER >= 17
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#endif
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/* Features that were introduced after C++17 */
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#if TEST_STD_VER > 17
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#endif
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#define TEST_ALIGNAS_TYPE(...) TEST_ALIGNAS(TEST_ALIGNOF(__VA_ARGS__))
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#if !TEST_HAS_FEATURE(cxx_rtti) && !defined(__cpp_rtti) \
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&& !defined(__GXX_RTTI)
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#define TEST_HAS_NO_RTTI
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#endif
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#if !TEST_HAS_FEATURE(cxx_exceptions) && !defined(__cpp_exceptions) \
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&& !defined(__EXCEPTIONS)
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#define TEST_HAS_NO_EXCEPTIONS
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#endif
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#if TEST_HAS_FEATURE(address_sanitizer) || TEST_HAS_FEATURE(memory_sanitizer) || \
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TEST_HAS_FEATURE(thread_sanitizer)
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#define TEST_HAS_SANITIZERS
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#endif
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#if defined(_LIBCPP_NORETURN)
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#define TEST_NORETURN _LIBCPP_NORETURN
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#else
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#define TEST_NORETURN [[noreturn]]
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#endif
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#if defined(_LIBCPP_HAS_NO_ALIGNED_ALLOCATION) || \
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(!(TEST_STD_VER > 14 || \
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(defined(__cpp_aligned_new) && __cpp_aligned_new >= 201606L)))
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#define TEST_HAS_NO_ALIGNED_ALLOCATION
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#endif
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#if defined(_LIBCPP_SAFE_STATIC)
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#define TEST_SAFE_STATIC _LIBCPP_SAFE_STATIC
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#else
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#define TEST_SAFE_STATIC
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#endif
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// FIXME: Fix this feature check when either (A) a compiler provides a complete
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// implementation, or (b) a feature check macro is specified
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#if !defined(_MSC_VER) || defined(__clang__) || _MSC_VER < 1920 || _MSVC_LANG <= 201703L
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#define TEST_HAS_NO_SPACESHIP_OPERATOR
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#endif
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#if TEST_STD_VER < 11
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#define ASSERT_NOEXCEPT(...)
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#define ASSERT_NOT_NOEXCEPT(...)
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#else
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#define ASSERT_NOEXCEPT(...) \
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static_assert(noexcept(__VA_ARGS__), "Operation must be noexcept")
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#define ASSERT_NOT_NOEXCEPT(...) \
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static_assert(!noexcept(__VA_ARGS__), "Operation must NOT be noexcept")
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#endif
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/* Macros for testing libc++ specific behavior and extensions */
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#if defined(_LIBCPP_VERSION)
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#define LIBCPP_ASSERT(...) assert(__VA_ARGS__)
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#define LIBCPP_STATIC_ASSERT(...) static_assert(__VA_ARGS__)
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#define LIBCPP_ASSERT_NOEXCEPT(...) ASSERT_NOEXCEPT(__VA_ARGS__)
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#define LIBCPP_ASSERT_NOT_NOEXCEPT(...) ASSERT_NOT_NOEXCEPT(__VA_ARGS__)
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#define LIBCPP_ONLY(...) __VA_ARGS__
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#else
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#define LIBCPP_ASSERT(...) ((void)0)
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#define LIBCPP_STATIC_ASSERT(...) ((void)0)
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#define LIBCPP_ASSERT_NOEXCEPT(...) ((void)0)
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#define LIBCPP_ASSERT_NOT_NOEXCEPT(...) ((void)0)
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#define LIBCPP_ONLY(...) ((void)0)
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#endif
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#define TEST_IGNORE_NODISCARD (void)
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namespace test_macros_detail {
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template <class T, class U>
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struct is_same { enum { value = 0};} ;
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template <class T>
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struct is_same<T, T> { enum {value = 1}; };
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} // namespace test_macros_detail
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#define ASSERT_SAME_TYPE(...) \
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static_assert((test_macros_detail::is_same<__VA_ARGS__>::value), \
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"Types differ unexpectedly")
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#ifndef TEST_HAS_NO_EXCEPTIONS
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#define TEST_THROW(...) throw __VA_ARGS__
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#else
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#if defined(__GNUC__)
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#define TEST_THROW(...) __builtin_abort()
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#else
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#include <stdlib.h>
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#define TEST_THROW(...) ::abort()
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#endif
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#endif
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#if defined(__GNUC__) || defined(__clang__)
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template <class Tp>
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inline
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void DoNotOptimize(Tp const& value) {
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asm volatile("" : : "r,m"(value) : "memory");
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}
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template <class Tp>
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inline void DoNotOptimize(Tp& value) {
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#if defined(__clang__)
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asm volatile("" : "+r,m"(value) : : "memory");
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#else
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asm volatile("" : "+m,r"(value) : : "memory");
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#endif
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}
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#else
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#include <intrin.h>
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template <class Tp>
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inline void DoNotOptimize(Tp const& value) {
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const volatile void* volatile unused = __builtin_addressof(value);
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static_cast<void>(unused);
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_ReadWriteBarrier();
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}
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#endif
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#if defined(__GNUC__)
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#define TEST_ALWAYS_INLINE __attribute__((always_inline))
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#define TEST_NOINLINE __attribute__((noinline))
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#elif defined(_MSC_VER)
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#define TEST_ALWAYS_INLINE __forceinline
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#define TEST_NOINLINE __declspec(noinline)
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#else
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#define TEST_ALWAYS_INLINE
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#define TEST_NOINLINE
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#endif
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#if defined(__GNUC__)
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#pragma GCC diagnostic pop
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#endif
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#endif // SUPPORT_TEST_MACROS_HPP
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