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93 lines
2.9 KiB
C++
93 lines
2.9 KiB
C++
//===--- Compiler.h - Compiler specific definitions -------------*- C++ -*-===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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#ifndef SWIFT_BASIC_COMPILER_H
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#define SWIFT_BASIC_COMPILER_H
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#if defined(_MSC_VER) && !defined(__clang__)
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#define SWIFT_COMPILER_IS_MSVC 1
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#else
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#define SWIFT_COMPILER_IS_MSVC 0
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#endif
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// Workaround non-clang compilers
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#ifndef __has_builtin
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#define __has_builtin(x) 0
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#endif
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#ifndef __has_attribute
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#define __has_attribute(x) 0
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#endif
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// __builtin_assume() is an optimization hint.
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#if __has_builtin(__builtin_assume)
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#define SWIFT_ASSUME(x) __builtin_assume(x)
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#else
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#define SWIFT_ASSUME(x)
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#endif
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/// Attributes.
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#if __has_attribute(constructor)
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#define SWIFT_CONSTRUCTOR __attribute__((constructor))
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#else
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#define SWIFT_CONSTRUCTOR
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#endif
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/// \macro SWIFT_GNUC_PREREQ
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/// Extend the default __GNUC_PREREQ even if glibc's features.h isn't
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/// available.
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#ifndef SWIFT_GNUC_PREREQ
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# if defined(__GNUC__) && defined(__GNUC_MINOR__) && defined(__GNUC_PATCHLEVEL__)
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# define SWIFT_GNUC_PREREQ(maj, min, patch) \
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((__GNUC__ << 20) + (__GNUC_MINOR__ << 10) + __GNUC_PATCHLEVEL__ >= \
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((maj) << 20) + ((min) << 10) + (patch))
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# elif defined(__GNUC__) && defined(__GNUC_MINOR__)
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# define SWIFT_GNUC_PREREQ(maj, min, patch) \
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((__GNUC__ << 20) + (__GNUC_MINOR__ << 10) >= ((maj) << 20) + ((min) << 10))
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# else
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# define SWIFT_GNUC_PREREQ(maj, min, patch) 0
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# endif
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#endif
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/// SWIFT_ATTRIBUTE_NOINLINE - On compilers where we have a directive to do so,
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/// mark a method "not for inlining".
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#if __has_attribute(noinline) || SWIFT_GNUC_PREREQ(3, 4, 0)
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#define SWIFT_ATTRIBUTE_NOINLINE __attribute__((noinline))
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#elif defined(_MSC_VER)
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#define SWIFT_ATTRIBUTE_NOINLINE __declspec(noinline)
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#else
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#define SWIFT_ATTRIBUTE_NOINLINE
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#endif
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/// SWIFT_ATTRIBUTE_ALWAYS_INLINE - On compilers where we have a directive to do
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/// so, mark a method "always inline" because it is performance sensitive. GCC
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/// 3.4 supported this but is buggy in various cases and produces unimplemented
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/// errors, just use it in GCC 4.0 and later.
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#if __has_attribute(always_inline) || SWIFT_GNUC_PREREQ(4, 0, 0)
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#define SWIFT_ATTRIBUTE_ALWAYS_INLINE __attribute__((always_inline))
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#elif defined(_MSC_VER)
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#define SWIFT_ATTRIBUTE_ALWAYS_INLINE __forceinline
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#else
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#define SWIFT_ATTRIBUTE_ALWAYS_INLINE
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#endif
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#ifdef __GNUC__
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#define SWIFT_ATTRIBUTE_NORETURN __attribute__((noreturn))
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#elif defined(_MSC_VER)
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#define SWIFT_ATTRIBUTE_NORETURN __declspec(noreturn)
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#else
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#define SWIFT_ATTRIBUTE_NORETURN
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#endif
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#endif // SWIFT_BASIC_COMPILER_H
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