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443389effc
Without this patch, 20k files are opened (openat syscall) because of duplicate includes. This patch reduced it to 3k and build time was reduced compile time of range.o from 15sec -> 3sec on my machine. [Bug #16772]
124 lines
4 KiB
C++
124 lines
4 KiB
C++
/** \noop-*-C++-*-vi:ft=cpp
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* @file
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* @author Ruby developers <ruby-core@ruby-lang.org>
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* @copyright This file is a part of the programming language Ruby.
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* Permission is hereby granted, to either redistribute and/or
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* modify this file, provided that the conditions mentioned in the
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* file COPYING are met. Consult the file for details.
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* @warning Symbols prefixed with either `RUBY3` or `ruby3` are
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* implementation details. Don't take them as canon. They could
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* rapidly appear then vanish. The name (path) of this header file
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* is also an implementation detail. Do not expect it to persist
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* at the place it is now. Developers are free to move it anywhere
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* anytime at will.
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* @note To ruby-core: remember that this header can be possibly
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* recursively included from extension libraries written in C++.
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* Do not expect for instance `__VA_ARGS__` is always available.
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* We assume C99 for ruby itself but we don't assume languages of
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* extension libraries. They could be written in C++98.
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* @brief Defines #RUBY3_ALIGNAS / #RUBY3_ALIGNOF
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*/
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#include "ruby/3/config.h"
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#ifdef HAVE_STDALIGN_H
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# include <stdalign.h>
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#endif
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#include "ruby/3/compiler_is.h"
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#include "ruby/3/has/feature.h"
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#include "ruby/3/has/extension.h"
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#include "ruby/3/has/declspec_attribute.h"
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/**
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* Wraps (or simulates) `alignas`. This is C++11's `alignas` and is _different_
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* from C11 `_Alignas`. For instance,
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*
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* ```CXX
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* typedef struct alignas(128) foo { int foo } foo;
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* ```
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*
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* is a valid C++ while
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*
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* ```C
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* typedef struct _Alignas(128) foo { int foo } foo;
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* ```
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*
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* is an invalid C because:
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*
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* - You cannot `struct _Alignas`.
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* - A `typedef` cannot have alignments.
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*/
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#if defined(RUBY3_ALIGNAS)
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# /* OK, take that. */
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#elif defined(__cplusplus) && RUBY3_HAS_FEATURE(cxx_alignas)
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# define RUBY3_ALIGNAS alignas
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#elif defined(__cplusplus) && (__cplusplus >= 201103L)
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# define RUBY3_ALIGNAS alignas
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#elif defined(__INTEL_CXX11_MODE__)
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# define RUBY3_ALIGNAS alignas
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#elif defined(__GXX_EXPERIMENTAL_CXX0X__)
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# define RUBY3_ALIGNAS alignas
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#elif RUBY3_HAS_DECLSPEC_ATTRIBUTE(align)
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# define RUBY3_ALIGNAS(_) __declspec(align(_))
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#elif RUBY3_HAS_ATTRIBUTE(aliged)
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# define RUBY3_ALIGNAS(_) __attribute__((__aligned__(_)))
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#else
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# define RUBY3_ALIGNAS(_) /* void */
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#endif
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/**
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* Wraps (or simulates) `alignof`. Unlike #RUBY3_ALIGNAS, we can safely say
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* both C/C++ definitions are effective.
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*/
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#ifdef RUBY3_ALIGNOF
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# /* OK, take that. */
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#elif defined(__cplusplus) && RUBY3_HAS_EXTENSION(cxx_alignof)
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# define RUBY3_ALIGNOF __extension__ alignof
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#elif defined(__cplusplus) && (__cplusplus >= 201103L)
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# define RUBY3_ALIGNOF alignof
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#elif defined(__INTEL_CXX11_MODE__)
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# define RUBY3_ALIGNOF alignof
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#elif defined(__GXX_EXPERIMENTAL_CXX0X__)
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# define RUBY3_ALIGNOF alignof
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#elif defined(__STDC_VERSION__) && RUBY3_HAS_EXTENSION(c_alignof)
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# define RUBY3_ALIGNOF __extension__ _Alignof
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#elif defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 201112L)
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# define RUBY3_ALIGNOF _Alignof
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#elif RUBY3_COMPILER_IS(MSVC)
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# define RUBY3_ALIGNOF __alignof
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#elif defined(__GNUC__)
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# /* At least GCC 2.95 had this. */
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# define RUBY3_ALIGNOF __extension__ __alignof__
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#elif defined(__alignof_is_defined) || defined(__DOXYGEN__)
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# /* OK, we can safely take <stdalign.h> definition. */
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# define RUBY3_ALIGNOF alignof
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#elif RUBY3_COMPILER_SINCE(SunPro, 5, 9, 0)
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# /* According to their manual, Sun Studio 12 introduced __alignof__ for both
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# * C/C++. */
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# define RUBY3_ALIGNOF __alignof__
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#elif 0
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# /* THIS IS NG, you cannot define a new type inside of offsetof. */
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# /* see: http://www.open-std.org/jtc1/sc22/wg14/www/docs/n2350.htm */
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# define RUBY3_ALIGNOF(T) offsetof(struct { char _; T t; }, t)
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#else
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# error :FIXME: add your compiler here to obtain an alignment.
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#endif
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