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125 lines
3.9 KiB
C++
125 lines
3.9 KiB
C++
#pragma once
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/// __has_feature supported only by clang.
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///
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/// But libcxx/libcxxabi overrides it to 0,
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/// thus the checks for __has_feature will be wrong.
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///
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/// NOTE:
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/// - __has_feature cannot be simply undefined,
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/// since this will be broken if some C++ header will be included after
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/// including <common/defines.h>
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/// - it should not have fallback to 0,
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/// since this may create false-positive detection (common problem)
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#if defined(__clang__) && defined(__has_feature)
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# define ch_has_feature __has_feature
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#endif
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#if defined(_MSC_VER)
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# if !defined(likely)
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# define likely(x) (x)
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# endif
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# if !defined(unlikely)
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# define unlikely(x) (x)
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# endif
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#else
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# if !defined(likely)
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# define likely(x) (__builtin_expect(!!(x), 1))
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# endif
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# if !defined(unlikely)
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# define unlikely(x) (__builtin_expect(!!(x), 0))
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# endif
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#endif
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#if defined(_MSC_VER)
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# define ALWAYS_INLINE __forceinline
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# define NO_INLINE static __declspec(noinline)
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# define MAY_ALIAS
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#else
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# define ALWAYS_INLINE __attribute__((__always_inline__))
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# define NO_INLINE __attribute__((__noinline__))
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# define MAY_ALIAS __attribute__((__may_alias__))
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#endif
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#if !defined(__x86_64__) && !defined(__aarch64__) && !defined(__PPC__)
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# error "The only supported platforms are x86_64 and AArch64, PowerPC (work in progress)"
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#endif
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/// Check for presence of address sanitizer
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#if !defined(ADDRESS_SANITIZER)
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# if defined(ch_has_feature)
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# if ch_has_feature(address_sanitizer)
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# define ADDRESS_SANITIZER 1
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# endif
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# elif defined(__SANITIZE_ADDRESS__)
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# define ADDRESS_SANITIZER 1
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# endif
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#endif
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#if !defined(THREAD_SANITIZER)
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# if defined(ch_has_feature)
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# if ch_has_feature(thread_sanitizer)
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# define THREAD_SANITIZER 1
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# endif
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# elif defined(__SANITIZE_THREAD__)
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# define THREAD_SANITIZER 1
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# endif
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#endif
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#if !defined(MEMORY_SANITIZER)
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# if defined(ch_has_feature)
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# if ch_has_feature(memory_sanitizer)
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# define MEMORY_SANITIZER 1
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# endif
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# elif defined(__MEMORY_SANITIZER__)
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# define MEMORY_SANITIZER 1
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# endif
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#endif
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#if !defined(UNDEFINED_BEHAVIOR_SANITIZER)
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# if defined(__has_feature)
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# if __has_feature(undefined_behavior_sanitizer)
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# define UNDEFINED_BEHAVIOR_SANITIZER 1
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# endif
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# elif defined(__UNDEFINED_BEHAVIOR_SANITIZER__)
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# define UNDEFINED_BEHAVIOR_SANITIZER 1
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# endif
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#endif
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#if defined(ADDRESS_SANITIZER)
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# define BOOST_USE_ASAN 1
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# define BOOST_USE_UCONTEXT 1
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#endif
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#if defined(THREAD_SANITIZER)
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# define BOOST_USE_TSAN 1
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# define BOOST_USE_UCONTEXT 1
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#endif
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#if defined(ARCADIA_BUILD) && defined(BOOST_USE_UCONTEXT)
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# undef BOOST_USE_UCONTEXT
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#endif
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/// TODO: Strange enough, there is no way to detect UB sanitizer.
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/// Explicitly allow undefined behaviour for certain functions. Use it as a function attribute.
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/// It is useful in case when compiler cannot see (and exploit) it, but UBSan can.
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/// Example: multiplication of signed integers with possibility of overflow when both sides are from user input.
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#if defined(__clang__)
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# define NO_SANITIZE_UNDEFINED __attribute__((__no_sanitize__("undefined")))
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# define NO_SANITIZE_ADDRESS __attribute__((__no_sanitize__("address")))
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# define NO_SANITIZE_THREAD __attribute__((__no_sanitize__("thread")))
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# define ALWAYS_INLINE_NO_SANITIZE_UNDEFINED __attribute__((__always_inline__, __no_sanitize__("undefined")))
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#else /// It does not work in GCC. GCC 7 cannot recognize this attribute and GCC 8 simply ignores it.
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# define NO_SANITIZE_UNDEFINED
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# define NO_SANITIZE_ADDRESS
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# define NO_SANITIZE_THREAD
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# define ALWAYS_INLINE_NO_SANITIZE_UNDEFINED ALWAYS_INLINE
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#endif
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/// A template function for suppressing warnings about unused variables or function results.
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template <typename... Args>
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constexpr void UNUSED(Args &&... args [[maybe_unused]])
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{
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}
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