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/* compiler.h: macros to abstract away compiler specifics
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#ifndef COMPILER_H
#define COMPILER_H
#define HOST_BIG_ENDIAN (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)
/* HOST_LONG_BITS is the size of a native pointer in bits. */
#define HOST_LONG_BITS (__SIZEOF_POINTER__ * 8)
#if defined __clang_analyzer__ || defined __COVERITY__
#define QEMU_STATIC_ANALYSIS 1
#endif
#ifdef __cplusplus
#define QEMU_EXTERN_C extern "C"
#else
#define QEMU_EXTERN_C extern
#endif
#if defined(_WIN32) && (defined(__x86_64__) || defined(__i386__))
# define QEMU_PACKED __attribute__((gcc_struct, packed))
#else
# define QEMU_PACKED __attribute__((packed))
#endif
#define QEMU_ALIGNED(X) __attribute__((aligned(X)))
#ifndef glue
#define xglue(x, y) x ## y
#define glue(x, y) xglue(x, y)
#define stringify(s) tostring(s)
#define tostring(s) #s
#endif
/* Expands into an identifier stemN, where N is another number each time */
#define MAKE_IDENTFIER(stem) glue(stem, __COUNTER__)
#ifndef likely
#define likely(x) __builtin_expect(!!(x), 1)
#define unlikely(x) __builtin_expect(!!(x), 0)
#endif
#ifndef container_of
#define container_of(ptr, type, member) ({ \
const typeof(((type *) 0)->member) *__mptr = (ptr); \
(type *) ((char *) __mptr - offsetof(type, member));})
#endif
#define sizeof_field(type, field) sizeof(((type *)0)->field)
/*
* Calculate the number of bytes up to and including the given 'field' of
* 'container'.
*/
#define endof(container, field) \
(offsetof(container, field) + sizeof_field(container, field))
/* Convert from a base type to a parent type, with compile time checking. */
#define DO_UPCAST(type, field, dev) ( __extension__ ( { \
char __attribute__((unused)) offset_must_be_zero[ \
-offsetof(type, field)]; \
container_of(dev, type, field);}))
#define typeof_field(type, field) typeof(((type *)0)->field)
#define type_check(t1,t2) ((t1*)0 - (t2*)0)
#define QEMU_BUILD_BUG_ON_STRUCT(x) \
struct { \
int:(x) ? -1 : 1; \
}
#define QEMU_BUILD_BUG_MSG(x, msg) _Static_assert(!(x), msg)
#define QEMU_BUILD_BUG_ON(x) QEMU_BUILD_BUG_MSG(x, "not expecting: " #x)
#define QEMU_BUILD_BUG_ON_ZERO(x) (sizeof(QEMU_BUILD_BUG_ON_STRUCT(x)) - \
sizeof(QEMU_BUILD_BUG_ON_STRUCT(x)))
#if !defined(__clang__) && defined(_WIN32)
/*
* Map __printf__ to __gnu_printf__ because we want standard format strings even
* when MinGW or GLib include files use __printf__.
*/
# define __printf__ __gnu_printf__
#endif
#ifndef __has_warning
#define __has_warning(x) 0 /* compatibility with non-clang compilers */
#endif
#ifndef __has_feature
#define __has_feature(x) 0 /* compatibility with non-clang compilers */
#endif
#ifndef __has_builtin
#define __has_builtin(x) 0 /* compatibility with non-clang compilers */
#endif
#if __has_builtin(__builtin_assume_aligned) || !defined(__clang__)
#define HAS_ASSUME_ALIGNED
#endif
#ifndef __has_attribute
#define __has_attribute(x) 0 /* compatibility with older GCC */
#endif
#if defined(__SANITIZE_ADDRESS__) || __has_feature(address_sanitizer)
# define QEMU_SANITIZE_ADDRESS 1
#endif
#if defined(__SANITIZE_THREAD__) || __has_feature(thread_sanitizer)
# define QEMU_SANITIZE_THREAD 1
#endif
/*
* GCC doesn't provide __has_attribute() until GCC 5, but we know all the GCC
* versions we support have the "flatten" attribute. Clang may not have the
* "flatten" attribute but always has __has_attribute() to check for it.
*/
#if __has_attribute(flatten) || !defined(__clang__)
# define QEMU_FLATTEN __attribute__((flatten))
#else
# define QEMU_FLATTEN
#endif
/*
* If __attribute__((error)) is present, use it to produce an error at
* compile time. Otherwise, one must wait for the linker to diagnose
* the missing symbol.
*/
#if __has_attribute(error)
# define QEMU_ERROR(X) __attribute__((error(X)))
#else
# define QEMU_ERROR(X)
#endif
/*
* The nonstring variable attribute specifies that an object or member
* declaration with type array of char or pointer to char is intended
* to store character arrays that do not necessarily contain a terminating
* NUL character. This is useful in detecting uses of such arrays or pointers
* with functions that expect NUL-terminated strings, and to avoid warnings
* when such an array or pointer is used as an argument to a bounded string
* manipulation function such as strncpy.
*/
#if __has_attribute(nonstring)
# define QEMU_NONSTRING __attribute__((nonstring))
#else
# define QEMU_NONSTRING
#endif
/*
* Forced inlining may be desired to encourage constant propagation
* of function parameters. However, it can also make debugging harder,
* so disable it for a non-optimizing build.
*/
#if defined(__OPTIMIZE__)
#define QEMU_ALWAYS_INLINE __attribute__((always_inline))
#else
#define QEMU_ALWAYS_INLINE
#endif
/**
* In most cases, normal "fallthrough" comments are good enough for
* switch-case statements, but sometimes the compiler has problems
* with those. In that case you can use QEMU_FALLTHROUGH instead.
*/
#if __has_attribute(fallthrough)
# define QEMU_FALLTHROUGH __attribute__((fallthrough))
#else
# define QEMU_FALLTHROUGH do {} while (0) /* fallthrough */
#endif
#ifdef CONFIG_CFI
/*
* If CFI is enabled, use an attribute to disable cfi-icall on the following
* function
*/
#define QEMU_DISABLE_CFI __attribute__((no_sanitize("cfi-icall")))
#else
/* If CFI is not enabled, use an empty define to not change the behavior */
#define QEMU_DISABLE_CFI
#endif
/*
* Apple clang version 14 has a bug in its __builtin_subcll(); define
* BUILTIN_SUBCLL_BROKEN for the offending versions so we can avoid it.
* When a version of Apple clang which has this bug fixed is released
* we can add an upper bound to this check.
* See https://gitlab.com/qemu-project/qemu/-/issues/1631
* and https://gitlab.com/qemu-project/qemu/-/issues/1659 for details.
* The bug never made it into any upstream LLVM releases, only Apple ones.
*/
#if defined(__apple_build_version__) && __clang_major__ >= 14
#define BUILTIN_SUBCLL_BROKEN
#endif
#if __has_attribute(annotate)
#define QEMU_ANNOTATE(x) __attribute__((annotate(x)))
#else
#define QEMU_ANNOTATE(x)
#endif
#if __has_attribute(used)
# define QEMU_USED __attribute__((used))
#else
# define QEMU_USED
#endif
/*
* Ugly CPP trick that is like "defined FOO", but also works in C
* code. Useful to replace #ifdef with "if" statements; assumes
* the symbol was defined with Meson's "config.set()", so it is empty
* if defined.
*/
#define IS_ENABLED(x) IS_EMPTY(x)
#define IS_EMPTY_JUNK_ junk,
#define IS_EMPTY(value) IS_EMPTY_(IS_EMPTY_JUNK_##value)
/* Expands to either SECOND_ARG(junk, 1, 0) or SECOND_ARG(IS_EMPTY_JUNK_CONFIG_FOO 1, 0) */
#define SECOND_ARG(first, second, ...) second
#define IS_EMPTY_(junk_maybecomma) SECOND_ARG(junk_maybecomma 1, 0)
#endif /* COMPILER_H */
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