ClickHouse/base/common/defines.h

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#pragma once
#if defined(_MSC_VER)
# if !defined(likely)
# define likely(x) (x)
# endif
# if !defined(unlikely)
# define unlikely(x) (x)
# endif
#else
# if !defined(likely)
# define likely(x) (__builtin_expect(!!(x), 1))
# endif
# if !defined(unlikely)
# define unlikely(x) (__builtin_expect(!!(x), 0))
# endif
#endif
#if defined(_MSC_VER)
# define ALWAYS_INLINE __forceinline
# define NO_INLINE static __declspec(noinline)
# define MAY_ALIAS
#else
# define ALWAYS_INLINE __attribute__((__always_inline__))
# define NO_INLINE __attribute__((__noinline__))
# define MAY_ALIAS __attribute__((__may_alias__))
#endif
#if !defined(__x86_64__) && !defined(__aarch64__) && !defined(__PPC__)
# error "The only supported platforms are x86_64 and AArch64, PowerPC (work in progress)"
#endif
/// Check for presence of address sanitizer
#if !defined(ADDRESS_SANITIZER)
# if defined(__has_feature)
# if __has_feature(address_sanitizer)
# define ADDRESS_SANITIZER 1
# endif
# elif defined(__SANITIZE_ADDRESS__)
# define ADDRESS_SANITIZER 1
# endif
#endif
#if !defined(THREAD_SANITIZER)
# if defined(__has_feature)
# if __has_feature(thread_sanitizer)
# define THREAD_SANITIZER 1
# endif
# elif defined(__SANITIZE_THREAD__)
# define THREAD_SANITIZER 1
# endif
#endif
#if !defined(MEMORY_SANITIZER)
# if defined(__has_feature)
# if __has_feature(memory_sanitizer)
# define MEMORY_SANITIZER 1
# endif
# elif defined(__MEMORY_SANITIZER__)
# define MEMORY_SANITIZER 1
# endif
#endif
/// TODO: Strange enough, there is no way to detect UB sanitizer.
/// Explicitly allow undefined behaviour for certain functions. Use it as a function attribute.
/// It is useful in case when compiler cannot see (and exploit) it, but UBSan can.
/// Example: multiplication of signed integers with possibility of overflow when both sides are from user input.
#if defined(__clang__)
# define NO_SANITIZE_UNDEFINED __attribute__((__no_sanitize__("undefined")))
# define NO_SANITIZE_ADDRESS __attribute__((__no_sanitize__("address")))
# define NO_SANITIZE_THREAD __attribute__((__no_sanitize__("thread")))
#else /// It does not work in GCC. GCC 7 cannot recognize this attribute and GCC 8 simply ignores it.
# define NO_SANITIZE_UNDEFINED
# define NO_SANITIZE_ADDRESS
# define NO_SANITIZE_THREAD
#endif
#if defined __GNUC__ && !defined __clang__
# define OPTIMIZE(x) __attribute__((__optimize__(x)))
#else
# define OPTIMIZE(x)
#endif
/// A macro for suppressing warnings about unused variables or function results.
/// Useful for structured bindings which have no standard way to declare this.
#define UNUSED(...) (void)(__VA_ARGS__)