зеркало из https://github.com/github/ruby.git
129 строки
3.8 KiB
C
129 строки
3.8 KiB
C
/**
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* @file defines.h
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*
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* Macro definitions used throughout the prism library.
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*
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* This file should be included first by any *.h or *.c in prism for consistency
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* and to ensure that the macros are defined before they are used.
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*/
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#ifndef PRISM_DEFINES_H
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#define PRISM_DEFINES_H
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#include <ctype.h>
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#include <math.h>
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#include <stdarg.h>
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#include <stddef.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <string.h>
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/**
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* We want to be able to use the PRI* macros for printing out integers, but on
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* some platforms they aren't included unless this is already defined.
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*/
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#define __STDC_FORMAT_MACROS
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#include <inttypes.h>
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/**
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* By default, we compile with -fvisibility=hidden. When this is enabled, we
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* need to mark certain functions as being publically-visible. This macro does
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* that in a compiler-agnostic way.
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*/
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#ifndef PRISM_EXPORTED_FUNCTION
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# ifdef PRISM_EXPORT_SYMBOLS
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# ifdef _WIN32
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# define PRISM_EXPORTED_FUNCTION __declspec(dllexport) extern
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# else
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# define PRISM_EXPORTED_FUNCTION __attribute__((__visibility__("default"))) extern
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# endif
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# else
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# define PRISM_EXPORTED_FUNCTION
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# endif
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#endif
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/**
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* Certain compilers support specifying that a function accepts variadic
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* parameters that look like printf format strings to provide a better developer
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* experience when someone is using the function. This macro does that in a
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* compiler-agnostic way.
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*/
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#if defined(__GNUC__)
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# define PRISM_ATTRIBUTE_FORMAT(string_index, argument_index) __attribute__((format(printf, string_index, argument_index)))
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#elif defined(__clang__)
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# define PRISM_ATTRIBUTE_FORMAT(string_index, argument_index) __attribute__((__format__(__printf__, string_index, argument_index)))
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#else
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# define PRISM_ATTRIBUTE_FORMAT(string_index, argument_index)
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#endif
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/**
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* GCC will warn if you specify a function or parameter that is unused at
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* runtime. This macro allows you to mark a function or parameter as unused in a
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* compiler-agnostic way.
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*/
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#if defined(__GNUC__)
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# define PRISM_ATTRIBUTE_UNUSED __attribute__((unused))
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#else
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# define PRISM_ATTRIBUTE_UNUSED
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#endif
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/**
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* Old Visual Studio versions do not support the inline keyword, so we need to
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* define it to be __inline.
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*/
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#if defined(_MSC_VER) && !defined(inline)
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# define inline __inline
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#endif
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/**
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* Old Visual Studio versions before 2015 do not implement sprintf, but instead
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* implement _snprintf. We standard that here.
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*/
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#if !defined(snprintf) && defined(_MSC_VER) && (_MSC_VER < 1900)
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# define snprintf _snprintf
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#endif
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/**
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* A simple utility macro to concatenate two tokens together, necessary when one
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* of the tokens is itself a macro.
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*/
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#define PM_CONCATENATE(left, right) left ## right
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/**
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* We want to be able to use static assertions, but they weren't standardized
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* until C11. As such, we polyfill it here by making a hacky typedef that will
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* fail to compile due to a negative array size if the condition is false.
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*/
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#if defined(_Static_assert)
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# define PM_STATIC_ASSERT(line, condition, message) _Static_assert(condition, message)
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#else
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# define PM_STATIC_ASSERT(line, condition, message) typedef char PM_CONCATENATE(static_assert_, line)[(condition) ? 1 : -1]
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#endif
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/**
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* In general, libc for embedded systems does not support memory-mapped files.
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* If the target platform is POSIX or Windows, we can map a file in memory and
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* read it in a more efficient manner.
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*/
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#ifdef _WIN32
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# define PRISM_HAS_MMAP
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#else
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# include <unistd.h>
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# ifdef _POSIX_MAPPED_FILES
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# define PRISM_HAS_MMAP
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# endif
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#endif
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/**
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* isinf on Windows is defined as accepting a float, but on POSIX systems it
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* accepts a float, a double, or a long double. We want to mirror this behavior
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* on windows.
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*/
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#ifdef _WIN32
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# include <float.h>
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# undef isinf
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# define isinf(x) (sizeof(x) == sizeof(float) ? !_finitef(x) : !_finite(x))
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#endif
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#endif
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