diff options
Diffstat (limited to 'include/libHX/defs.h')
| -rw-r--r-- | include/libHX/defs.h | 230 |
1 files changed, 230 insertions, 0 deletions
diff --git a/include/libHX/defs.h b/include/libHX/defs.h new file mode 100644 index 0000000..bb03f40 --- /dev/null +++ b/include/libHX/defs.h @@ -0,0 +1,230 @@ +#ifndef _LIBHX_DEFS_H +#define _LIBHX_DEFS_H 1 + +#ifdef __cplusplus +# define FIELD_SIZEOF(type, member) \ + sizeof(static_cast<type *>(NULL)->member) +# define HXsizeof_member(type, member) FIELD_SIZEOF(type, member) +# define HXtypeof_member(type, member) \ + __typeof__(static_cast<type *>(NULL)->member) +# if defined(__GNUC__) && __GNUC__ >= 4 && !defined(offsetof) + /* + * This is here so most programs can skip inclusion + * of stddef.h just to get offsetof. + */ +# define offsetof(type, member) __builtin_offsetof(type, member) +# endif +# ifndef offsetof +# define offsetof(type, member) \ + reinterpret_cast<long>(&(static_cast<type *>(NULL)->member)) +# endif +# ifndef containerof +# define containerof(var, type, member) reinterpret_cast<type *>( \ + reinterpret_cast<char *>(var) - offsetof(type, member)) +# endif + +template<typename new_type> +static __inline__ new_type signed_cast(const char *expr) +{ + return reinterpret_cast<new_type>(expr); +} + +template<typename new_type> +static __inline__ new_type signed_cast(const signed char *expr) +{ + return reinterpret_cast<new_type>(expr); +} + +template<typename new_type> +static __inline__ new_type signed_cast(const unsigned char *expr) +{ + return reinterpret_cast<new_type>(expr); +} + +template<typename new_type> +static __inline__ new_type signed_cast(char *expr) +{ + return reinterpret_cast<new_type>(expr); +} + +template<typename new_type> +static __inline__ new_type signed_cast(signed char *expr) +{ + return reinterpret_cast<new_type>(expr); +} + +template<typename new_type> +static __inline__ new_type signed_cast(unsigned char *expr) +{ + return reinterpret_cast<new_type>(expr); +} +#else +# define HXsizeof_member(type, member) sizeof(((type *)NULL)->member) +# define HXtypeof_member(type, member) __typeof__(((type *)NULL)->member) + /* N.B. signed_cast<> does not exist in C++. */ +# define __signed_cast_compatible(a, b) \ + __builtin_choose_expr( \ + __builtin_types_compatible_p(b, const char *) || \ + __builtin_types_compatible_p(b, const signed char *) || \ + __builtin_types_compatible_p(b, const unsigned char *), \ + /* if src has a const qualifier */ \ + __builtin_types_compatible_p(a, const char *) || \ + __builtin_types_compatible_p(a, const signed char *) || \ + __builtin_types_compatible_p(a, const unsigned char *), \ + /* and if it has none... */ \ + __builtin_types_compatible_p(a, const char *) || \ + __builtin_types_compatible_p(a, const signed char *) || \ + __builtin_types_compatible_p(a, const unsigned char *) || \ + __builtin_types_compatible_p(a, char *) || \ + __builtin_types_compatible_p(a, signed char *) || \ + __builtin_types_compatible_p(a, unsigned char *) \ + ) + +# if defined(__GNUC__) && !defined(__clang__) && !defined(signed_cast) +# define signed_cast(type, expr) ({ \ + BUILD_BUG_ON(!__signed_cast_compatible(__typeof__(type), __typeof__(expr))); \ + (type)(expr); \ + }) +# endif +# if defined(__GNUC__) && !defined(__clang__) && !defined(static_cast) +# define static_cast(type, expr) \ + ((struct { type x; }){(expr)}.x) +# endif +# if defined(__GNUC__) && !defined(__clang__) && !defined(const_cast1) +# define __const_cast_strip1(expr) \ + __typeof__(*(union { int z; __typeof__(expr) x; }){0}.x) +# define __const_cast_strip2(expr) \ + __typeof__(**(union { int z; __typeof__(expr) x; }){0}.x) +# define __const_cast_strip3(expr) \ + __typeof__(***(union { int z; __typeof__(expr) x; }){0}.x) +# define const_cast1(new_type, expr) ({ \ + BUILD_BUG_ON(!__builtin_types_compatible_p(__const_cast_strip1(expr), __const_cast_strip1(new_type))); \ + (new_type)(expr); \ + }) +# define const_cast2(new_type, expr) ({ \ + BUILD_BUG_ON(!__builtin_types_compatible_p(__const_cast_strip2(expr), __const_cast_strip2(new_type))); \ + (new_type)(expr); \ + }) +# define const_cast3(new_type, expr) ({ \ + BUILD_BUG_ON(!__builtin_types_compatible_p(__const_cast_strip3(expr), __const_cast_strip3(new_type))); \ + (new_type)(expr); \ + }) +# endif +# ifndef signed_cast +# define signed_cast(type, expr) ((type)(expr)) +# endif +# ifndef static_cast +# define static_cast(type, expr) ((type)(expr)) +# endif +# ifndef const_cast +# define const_cast(type, expr) ((type)(expr)) +# endif +# ifndef const_cast1 +# define const_cast1(type, expr) ((type)(expr)) +# define const_cast2(type, expr) ((type)(expr)) +# define const_cast3(type, expr) ((type)(expr)) +# endif +# ifndef reinterpret_cast +# define reinterpret_cast(type, expr) ((type)(expr)) +# endif +# if defined(__GNUC__) && __GNUC__ >= 4 && !defined(offsetof) +# define offsetof(type, member) __builtin_offsetof(type, member) +# endif +# ifndef offsetof +# define offsetof(type, member) \ + reinterpret_cast(long, &(static_cast(type *, NULL)->member)) +# endif +# ifndef containerof +# define containerof(var, type, member) reinterpret_cast(type *, \ + reinterpret_cast(char *, var) - offsetof(type, member)) +# endif +#endif + +#if defined(__GNUC__) && !defined(__cplusplus) + /* + * If typeof @a stays the same through a demotion to pointer, + * @a cannot be an array. + */ +# define __array_size_check(a) BUILD_BUG_ON_EXPR(\ + __builtin_types_compatible_p(__typeof__(a), \ + __typeof__(DEMOTE_TO_PTR(a)))) +#else +# define __array_size_check(a) 0 +#endif +#ifndef ARRAY_SIZE +# define ARRAY_SIZE(x) (sizeof(x) / sizeof(*(x)) + __array_size_check(x)) +#endif +#ifndef BUILD_BUG_ON_EXPR +# define BUILD_BUG_ON_EXPR(condition) (sizeof(char[1 - 2 * !!(condition)]) - 1) +#endif +#ifndef BUILD_BUG_ON +# define BUILD_BUG_ON(condition) ((void)BUILD_BUG_ON_EXPR(condition)) +#endif +#ifndef DEMOTE_TO_PTR + /* + * An alternative approach is also (p+0), but that does not ensure that + * @p is a pointer. Since functions "support" infinite dereferencing, + * "&*" also works on them. + */ +# define DEMOTE_TO_PTR(p) (&*(p)) +#endif +#ifndef O_BINARY +# define O_BINARY 0 +#endif +#ifndef S_IRGRP + /* Can happen in mingw */ +# define S_IRGRP (S_IRUSR >> 3) +#endif +#ifndef S_IWGRP +# define S_IWGRP (S_IWUSR >> 3) +#endif +#ifndef S_IXGRP +# define S_IXGRP (S_IXUSR >> 3) +#endif +#ifndef S_IROTH +# define S_IROTH (S_IRUSR >> 6) +#endif +#ifndef S_IWOTH +# define S_IWOTH (S_IWUSR >> 6) +#endif +#ifndef S_IXOTH +# define S_IXOTH (S_IXUSR >> 6) +#endif +#ifndef S_IRUGO +# define S_IRUGO (S_IRUSR | S_IRGRP | S_IROTH) +#endif +#ifndef S_IWUGO +# define S_IWUGO (S_IWUSR | S_IWGRP | S_IWOTH) +#endif +#ifndef S_IXUGO +# define S_IXUGO (S_IXUSR | S_IXGRP | S_IXOTH) +#endif +#ifndef S_IRWXUGO +# define S_IRWXUGO (S_IRUGO | S_IWUGO | S_IXUGO) +#endif + +#define HXSIZEOF_Z16 sizeof("-65536") +/* 2^32 and -2^31 have differing length */ +#define HXSIZEOF_Z32 sizeof("-4294967296") +/* 2^64 and -2^63 have same length */ +#define HXSIZEOF_Z64 sizeof("18446744073709551616") + +#define __HX_STRINGIFY_EXPAND(s) #s +#define HX_STRINGIFY(s) __HX_STRINGIFY_EXPAND(s) + +#ifndef container_of +# define container_of(v, s, m) containerof((v), s, m) +#endif + +#ifdef _WIN32 + /* + * Sufficiently old versions of the VC runtime do not even support %ll. + */ +# define HX_LONGLONG_FMT "I64" +# define HX_SIZET_FMT "I" +#else +# define HX_LONGLONG_FMT "ll" +# define HX_SIZET_FMT "z" +#endif + +#endif /* _LIBHX_DEFS_H */ |