mirror of
https://github.com/mruby/mruby
synced 2026-06-08 16:11:16 +00:00
dearblue
42513d61fd
Static proc objects defined as methods may be placed in 4-byte alignments in 32-bit environments. This may be misinterpreted as an immediate value depending on the address. Since C11 and C++11 have additional language features for byte alignment, corresponding compilers use them to define the `mrb_alignas()` macro. For earlier compilers, they use their own extensions to define the `mrb_alignas()` macro. GCC supports `__attribute__((aligned(alignment)))` since at least version 2.95.3 (1999). https://gcc.gnu.org/onlinedocs/gcc-2.95.3/gcc_4.html#IDX305 According to GPT-4, support was added in version 2.7 (1995). It is not known which version of Visual C++ added support for `__declspec(align(n))`. According to GPT-4, at least Visual C++ 6.0 (1998) seems to support it. Also, the documentation of past Intel C/C++ compilers that support `__declspec(align(n))` makes reference to support with Visual C++ 4.2 (1996). https://www.intel.com/content/dam/www/public/ijkk/jp/ja/documents/developer/ccomp40j.pdf
119 lines
3.1 KiB
C++
119 lines
3.1 KiB
C++
/**
|
|
** @file common.h - mruby common platform definition"
|
|
**
|
|
** See Copyright Notice in mruby.h
|
|
*/
|
|
|
|
#ifndef MRUBY_COMMON_H
|
|
#define MRUBY_COMMON_H
|
|
|
|
#ifdef __APPLE__
|
|
#ifndef __TARGETCONDITIONALS__
|
|
#include "TargetConditionals.h"
|
|
#endif
|
|
#endif
|
|
|
|
#ifdef __cplusplus
|
|
#ifdef MRB_USE_CXX_ABI
|
|
#define MRB_BEGIN_DECL
|
|
#define MRB_END_DECL
|
|
#else
|
|
# define MRB_BEGIN_DECL extern "C" {
|
|
# define MRB_END_DECL }
|
|
#endif
|
|
#else
|
|
/** Start declarations in C mode */
|
|
# define MRB_BEGIN_DECL
|
|
/** End declarations in C mode */
|
|
# define MRB_END_DECL
|
|
#endif
|
|
|
|
#include <sys/types.h>
|
|
#if defined _MSC_VER
|
|
#include <BaseTsd.h>
|
|
typedef SSIZE_T ssize_t;
|
|
#endif
|
|
|
|
/**
|
|
* Shared compiler macros
|
|
*/
|
|
MRB_BEGIN_DECL
|
|
|
|
/** Declare a function that never returns. */
|
|
#if defined __STDC_VERSION__ && __STDC_VERSION__ >= 201112L
|
|
# define mrb_noreturn _Noreturn
|
|
#elif defined __GNUC__ && !defined __STRICT_ANSI__
|
|
# define mrb_noreturn __attribute__((noreturn))
|
|
#elif defined _MSC_VER
|
|
# define mrb_noreturn __declspec(noreturn)
|
|
#else
|
|
# define mrb_noreturn
|
|
#endif
|
|
|
|
/** Mark a function as deprecated. */
|
|
#if defined __GNUC__ && !defined __STRICT_ANSI__
|
|
# define mrb_deprecated __attribute__((deprecated))
|
|
#elif defined _MSC_VER
|
|
# define mrb_deprecated __declspec(deprecated)
|
|
#else
|
|
# define mrb_deprecated
|
|
#endif
|
|
|
|
/** Declare a type or object as an alignment requirement. */
|
|
#ifndef mrb_alignas
|
|
# if defined(__cplusplus) && __cplusplus >= 201103L
|
|
# // https://en.cppreference.com/w/cpp/language/alignas
|
|
# define mrb_alignas(n) alignas(n)
|
|
# elif defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L
|
|
# // https://en.cppreference.com/w/c/language/_Alignas
|
|
# define mrb_alignas(n) _Alignas(n)
|
|
# elif defined(_MSC_VER) || defined(__INTEL_COMPILER)
|
|
# // https://learn.microsoft.com/en-us/cpp/cpp/align-cpp?view=msvc-170
|
|
# define mrb_alignas(n) __declspec(align(n))
|
|
# elif defined(__GNUC__) || defined(__clang__)
|
|
# // https://gcc.gnu.org/onlinedocs/gcc/Common-Type-Attributes.html#index-aligned-type-attribute
|
|
# define mrb_alignas(n) __attribute__((aligned(n)))
|
|
# else
|
|
# // `mrb_alignas` defined as dummy. If necessary, send issues to https://github.com/mruby/mruby .
|
|
# define mrb_alignas(n)
|
|
# endif
|
|
#endif
|
|
|
|
/** Declare a function as always inlined. */
|
|
#if defined _MSC_VER && _MSC_VER < 1900
|
|
# ifndef __cplusplus
|
|
# define inline __inline
|
|
# endif
|
|
#endif
|
|
#define MRB_INLINE static inline
|
|
|
|
/** Declare a public mruby API function. */
|
|
#ifndef MRB_API
|
|
#if defined(MRB_BUILD_AS_DLL)
|
|
#if defined(MRB_CORE) || defined(MRB_LIB)
|
|
# define MRB_API __declspec(dllexport)
|
|
#else
|
|
# define MRB_API __declspec(dllimport)
|
|
#endif
|
|
#else
|
|
# define MRB_API extern
|
|
#endif
|
|
#endif
|
|
|
|
/** Declare mingw versions */
|
|
#if defined(__MINGW32__) || defined(__MINGW64__)
|
|
# include <_mingw.h>
|
|
# if defined(__MINGW64_VERSION_MAJOR)
|
|
# define MRB_MINGW64_VERSION (__MINGW64_VERSION_MAJOR * 1000 + __MINGW64_VERSION_MINOR)
|
|
# elif defined(__MINGW32_MAJOR_VERSION)
|
|
# define MRB_MINGW32_VERSION (__MINGW32_MAJOR_VERSION * 1000 + __MINGW32_MINOR_VERSION)
|
|
# endif
|
|
# if defined(__MINGW32__) && !defined(__MINGW64__)
|
|
# define MRB_MINGW32_LEGACY
|
|
# endif
|
|
#endif
|
|
|
|
MRB_END_DECL
|
|
|
|
#endif /* MRUBY_COMMON_H */
|