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392 lines
14 KiB
C++
392 lines
14 KiB
C++
//===-- llvm/Support/Compiler.h - Compiler abstraction support --*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines several macros, based on the current compiler. This allows
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// use of compiler-specific features in a way that remains portable.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_SUPPORT_COMPILER_H
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#define LLVM_SUPPORT_COMPILER_H
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#include "llvm/Config/llvm-config.h"
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#ifndef __has_feature
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# define __has_feature(x) 0
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#endif
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#ifndef __has_extension
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# define __has_extension(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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#ifndef __has_builtin
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# define __has_builtin(x) 0
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#endif
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/// \macro LLVM_GNUC_PREREQ
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/// \brief Extend the default __GNUC_PREREQ even if glibc's features.h isn't
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/// available.
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#ifndef LLVM_GNUC_PREREQ
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# if defined(__GNUC__) && defined(__GNUC_MINOR__) && defined(__GNUC_PATCHLEVEL__)
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# define LLVM_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 LLVM_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 LLVM_GNUC_PREREQ(maj, min, patch) 0
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# endif
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#endif
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/// \macro LLVM_MSC_PREREQ
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/// \brief Is the compiler MSVC of at least the specified version?
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/// The common \param version values to check for are:
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/// * 1800: Microsoft Visual Studio 2013 / 12.0
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/// * 1900: Microsoft Visual Studio 2015 / 14.0
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#ifdef _MSC_VER
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#define LLVM_MSC_PREREQ(version) (_MSC_VER >= (version))
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// We require at least MSVC 2013.
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#if !LLVM_MSC_PREREQ(1800)
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#error LLVM requires at least MSVC 2013.
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#endif
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#else
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#define LLVM_MSC_PREREQ(version) 0
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#endif
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#if !defined(_MSC_VER) || defined(__clang__) || LLVM_MSC_PREREQ(1900)
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#define LLVM_NOEXCEPT noexcept
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#else
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#define LLVM_NOEXCEPT
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#endif
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/// \brief Does the compiler support ref-qualifiers for *this?
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///
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/// Sadly, this is separate from just rvalue reference support because GCC
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/// and MSVC implemented this later than everything else.
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#if __has_feature(cxx_rvalue_references) || LLVM_GNUC_PREREQ(4, 8, 1)
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#define LLVM_HAS_RVALUE_REFERENCE_THIS 1
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#else
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#define LLVM_HAS_RVALUE_REFERENCE_THIS 0
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#endif
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/// Expands to '&' if ref-qualifiers for *this are supported.
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///
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/// This can be used to provide lvalue/rvalue overrides of member functions.
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/// The rvalue override should be guarded by LLVM_HAS_RVALUE_REFERENCE_THIS
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#if LLVM_HAS_RVALUE_REFERENCE_THIS
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#define LLVM_LVALUE_FUNCTION &
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#else
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#define LLVM_LVALUE_FUNCTION
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#endif
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#if __has_feature(cxx_constexpr) || defined(__GXX_EXPERIMENTAL_CXX0X__)
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# define LLVM_CONSTEXPR constexpr
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#else
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# define LLVM_CONSTEXPR
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#endif
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/// LLVM_LIBRARY_VISIBILITY - If a class marked with this attribute is linked
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/// into a shared library, then the class should be private to the library and
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/// not accessible from outside it. Can also be used to mark variables and
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/// functions, making them private to any shared library they are linked into.
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/// On PE/COFF targets, library visibility is the default, so this isn't needed.
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#if (__has_attribute(visibility) || LLVM_GNUC_PREREQ(4, 0, 0)) && \
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!defined(__MINGW32__) && !defined(__CYGWIN__) && !defined(LLVM_ON_WIN32)
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#define LLVM_LIBRARY_VISIBILITY __attribute__ ((visibility("hidden")))
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#else
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#define LLVM_LIBRARY_VISIBILITY
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#endif
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#if __has_attribute(sentinel) || LLVM_GNUC_PREREQ(3, 0, 0)
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#define LLVM_END_WITH_NULL __attribute__((sentinel))
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#else
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#define LLVM_END_WITH_NULL
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#endif
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#if __has_attribute(used) || LLVM_GNUC_PREREQ(3, 1, 0)
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#define LLVM_ATTRIBUTE_USED __attribute__((__used__))
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#else
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#define LLVM_ATTRIBUTE_USED
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#endif
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#if __has_attribute(warn_unused_result) || LLVM_GNUC_PREREQ(3, 4, 0)
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#define LLVM_ATTRIBUTE_UNUSED_RESULT __attribute__((__warn_unused_result__))
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#else
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#define LLVM_ATTRIBUTE_UNUSED_RESULT
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#endif
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// Some compilers warn about unused functions. When a function is sometimes
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// used or not depending on build settings (e.g. a function only called from
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// within "assert"), this attribute can be used to suppress such warnings.
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//
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// However, it shouldn't be used for unused *variables*, as those have a much
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// more portable solution:
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// (void)unused_var_name;
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// Prefer cast-to-void wherever it is sufficient.
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#if __has_attribute(unused) || LLVM_GNUC_PREREQ(3, 1, 0)
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#define LLVM_ATTRIBUTE_UNUSED __attribute__((__unused__))
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#else
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#define LLVM_ATTRIBUTE_UNUSED
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#endif
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// FIXME: Provide this for PE/COFF targets.
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#if (__has_attribute(weak) || LLVM_GNUC_PREREQ(4, 0, 0)) && \
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(!defined(__MINGW32__) && !defined(__CYGWIN__) && !defined(LLVM_ON_WIN32))
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#define LLVM_ATTRIBUTE_WEAK __attribute__((__weak__))
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#else
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#define LLVM_ATTRIBUTE_WEAK
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#endif
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// Prior to clang 3.2, clang did not accept any spelling of
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// __has_attribute(const), so assume it is supported.
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#if defined(__clang__) || defined(__GNUC__)
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// aka 'CONST' but following LLVM Conventions.
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#define LLVM_READNONE __attribute__((__const__))
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#else
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#define LLVM_READNONE
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#endif
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#if __has_attribute(pure) || defined(__GNUC__)
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// aka 'PURE' but following LLVM Conventions.
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#define LLVM_READONLY __attribute__((__pure__))
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#else
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#define LLVM_READONLY
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#endif
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#if __has_builtin(__builtin_expect) || LLVM_GNUC_PREREQ(4, 0, 0)
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#define LLVM_LIKELY(EXPR) __builtin_expect((bool)(EXPR), true)
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#define LLVM_UNLIKELY(EXPR) __builtin_expect((bool)(EXPR), false)
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#else
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#define LLVM_LIKELY(EXPR) (EXPR)
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#define LLVM_UNLIKELY(EXPR) (EXPR)
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#endif
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// C++ doesn't support 'extern template' of template specializations. GCC does,
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// but requires __extension__ before it. In the header, use this:
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// EXTERN_TEMPLATE_INSTANTIATION(class foo<bar>);
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// in the .cpp file, use this:
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// TEMPLATE_INSTANTIATION(class foo<bar>);
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#ifdef __GNUC__
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#define EXTERN_TEMPLATE_INSTANTIATION(X) __extension__ extern template X
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#define TEMPLATE_INSTANTIATION(X) template X
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#else
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#define EXTERN_TEMPLATE_INSTANTIATION(X)
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#define TEMPLATE_INSTANTIATION(X)
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#endif
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/// LLVM_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) || LLVM_GNUC_PREREQ(3, 4, 0)
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#define LLVM_ATTRIBUTE_NOINLINE __attribute__((noinline))
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#elif defined(_MSC_VER)
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#define LLVM_ATTRIBUTE_NOINLINE __declspec(noinline)
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#else
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#define LLVM_ATTRIBUTE_NOINLINE
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#endif
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/// LLVM_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) || LLVM_GNUC_PREREQ(4, 0, 0)
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#define LLVM_ATTRIBUTE_ALWAYS_INLINE inline __attribute__((always_inline))
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#elif defined(_MSC_VER)
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#define LLVM_ATTRIBUTE_ALWAYS_INLINE __forceinline
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#else
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#define LLVM_ATTRIBUTE_ALWAYS_INLINE
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#endif
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#ifdef __GNUC__
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#define LLVM_ATTRIBUTE_NORETURN __attribute__((noreturn))
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#elif defined(_MSC_VER)
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#define LLVM_ATTRIBUTE_NORETURN __declspec(noreturn)
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#else
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#define LLVM_ATTRIBUTE_NORETURN
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#endif
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#if __has_attribute(returns_nonnull) || LLVM_GNUC_PREREQ(4, 9, 0)
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#define LLVM_ATTRIBUTE_RETURNS_NONNULL __attribute__((returns_nonnull))
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#else
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#define LLVM_ATTRIBUTE_RETURNS_NONNULL
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#endif
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/// \macro LLVM_ATTRIBUTE_RETURNS_NOALIAS Used to mark a function as returning a
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/// pointer that does not alias any other valid pointer.
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#ifdef __GNUC__
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#define LLVM_ATTRIBUTE_RETURNS_NOALIAS __attribute__((__malloc__))
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#elif defined(_MSC_VER)
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#define LLVM_ATTRIBUTE_RETURNS_NOALIAS __declspec(restrict)
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#else
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#define LLVM_ATTRIBUTE_RETURNS_NOALIAS
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#endif
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/// LLVM_EXTENSION - Support compilers where we have a keyword to suppress
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/// pedantic diagnostics.
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#ifdef __GNUC__
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#define LLVM_EXTENSION __extension__
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#else
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#define LLVM_EXTENSION
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#endif
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// LLVM_ATTRIBUTE_DEPRECATED(decl, "message")
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#if __has_feature(attribute_deprecated_with_message)
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# define LLVM_ATTRIBUTE_DEPRECATED(decl, message) \
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decl __attribute__((deprecated(message)))
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#elif defined(__GNUC__)
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# define LLVM_ATTRIBUTE_DEPRECATED(decl, message) \
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decl __attribute__((deprecated))
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#elif defined(_MSC_VER)
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# define LLVM_ATTRIBUTE_DEPRECATED(decl, message) \
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__declspec(deprecated(message)) decl
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#else
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# define LLVM_ATTRIBUTE_DEPRECATED(decl, message) \
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decl
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#endif
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/// LLVM_BUILTIN_UNREACHABLE - On compilers which support it, expands
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/// to an expression which states that it is undefined behavior for the
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/// compiler to reach this point. Otherwise is not defined.
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#if __has_builtin(__builtin_unreachable) || LLVM_GNUC_PREREQ(4, 5, 0)
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# define LLVM_BUILTIN_UNREACHABLE __builtin_unreachable()
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#elif defined(_MSC_VER)
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# define LLVM_BUILTIN_UNREACHABLE __assume(false)
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#endif
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/// LLVM_BUILTIN_TRAP - On compilers which support it, expands to an expression
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/// which causes the program to exit abnormally.
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#if __has_builtin(__builtin_trap) || LLVM_GNUC_PREREQ(4, 3, 0)
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# define LLVM_BUILTIN_TRAP __builtin_trap()
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#elif defined(_MSC_VER)
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// The __debugbreak intrinsic is supported by MSVC, does not require forward
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// declarations involving platform-specific typedefs (unlike RaiseException),
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// results in a call to vectored exception handlers, and encodes to a short
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// instruction that still causes the trapping behavior we want.
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# define LLVM_BUILTIN_TRAP __debugbreak()
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#else
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# define LLVM_BUILTIN_TRAP *(volatile int*)0x11 = 0
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#endif
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/// \macro LLVM_ASSUME_ALIGNED
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/// \brief Returns a pointer with an assumed alignment.
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#if __has_builtin(__builtin_assume_aligned) || LLVM_GNUC_PREREQ(4, 7, 0)
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# define LLVM_ASSUME_ALIGNED(p, a) __builtin_assume_aligned(p, a)
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#elif defined(LLVM_BUILTIN_UNREACHABLE)
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// As of today, clang does not support __builtin_assume_aligned.
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# define LLVM_ASSUME_ALIGNED(p, a) \
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(((uintptr_t(p) % (a)) == 0) ? (p) : (LLVM_BUILTIN_UNREACHABLE, (p)))
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#else
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# define LLVM_ASSUME_ALIGNED(p, a) (p)
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#endif
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/// \macro LLVM_ALIGNAS
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/// \brief Used to specify a minimum alignment for a structure or variable. The
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/// alignment must be a constant integer. Use LLVM_PTR_SIZE to compute
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/// alignments in terms of the size of a pointer.
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///
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/// Note that __declspec(align) has special quirks, it's not legal to pass a
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/// structure with __declspec(align) as a formal parameter.
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#ifdef _MSC_VER
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# define LLVM_ALIGNAS(x) __declspec(align(x))
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#elif __GNUC__ && !__has_feature(cxx_alignas) && !LLVM_GNUC_PREREQ(4, 8, 0)
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# define LLVM_ALIGNAS(x) __attribute__((aligned(x)))
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#else
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# define LLVM_ALIGNAS(x) alignas(x)
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#endif
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/// \macro LLVM_PTR_SIZE
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/// \brief A constant integer equivalent to the value of sizeof(void*).
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/// Generally used in combination with LLVM_ALIGNAS or when doing computation in
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/// the preprocessor.
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#ifdef __SIZEOF_POINTER__
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# define LLVM_PTR_SIZE __SIZEOF_POINTER__
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#elif defined(_WIN64)
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# define LLVM_PTR_SIZE 8
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#elif defined(_WIN32)
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# define LLVM_PTR_SIZE 4
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#elif defined(_MSC_VER)
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# error "could not determine LLVM_PTR_SIZE as a constant int for MSVC"
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#else
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# define LLVM_PTR_SIZE sizeof(void *)
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#endif
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/// \macro LLVM_FUNCTION_NAME
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/// \brief Expands to __func__ on compilers which support it. Otherwise,
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/// expands to a compiler-dependent replacement.
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#if defined(_MSC_VER)
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# define LLVM_FUNCTION_NAME __FUNCTION__
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#else
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# define LLVM_FUNCTION_NAME __func__
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#endif
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/// \macro LLVM_MEMORY_SANITIZER_BUILD
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/// \brief Whether LLVM itself is built with MemorySanitizer instrumentation.
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#if __has_feature(memory_sanitizer)
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# define LLVM_MEMORY_SANITIZER_BUILD 1
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# include <sanitizer/msan_interface.h>
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#else
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# define LLVM_MEMORY_SANITIZER_BUILD 0
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# define __msan_allocated_memory(p, size)
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# define __msan_unpoison(p, size)
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#endif
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/// \macro LLVM_ADDRESS_SANITIZER_BUILD
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/// \brief Whether LLVM itself is built with AddressSanitizer instrumentation.
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#if __has_feature(address_sanitizer) || defined(__SANITIZE_ADDRESS__)
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# define LLVM_ADDRESS_SANITIZER_BUILD 1
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#else
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# define LLVM_ADDRESS_SANITIZER_BUILD 0
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#endif
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/// \brief Mark debug helper function definitions like dump() that should not be
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/// stripped from debug builds.
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// FIXME: Move this to a private config.h as it's not usable in public headers.
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#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
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#define LLVM_DUMP_METHOD LLVM_ATTRIBUTE_NOINLINE LLVM_ATTRIBUTE_USED
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#else
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#define LLVM_DUMP_METHOD LLVM_ATTRIBUTE_NOINLINE
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#endif
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/// \macro LLVM_THREAD_LOCAL
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/// \brief A thread-local storage specifier which can be used with globals,
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/// extern globals, and static globals.
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///
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/// This is essentially an extremely restricted analog to C++11's thread_local
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/// support, and uses that when available. However, it falls back on
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/// platform-specific or vendor-provided extensions when necessary. These
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/// extensions don't support many of the C++11 thread_local's features. You
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/// should only use this for PODs that you can statically initialize to
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/// some constant value. In almost all circumstances this is most appropriate
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/// for use with a pointer, integer, or small aggregation of pointers and
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/// integers.
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#if LLVM_ENABLE_THREADS
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#if __has_feature(cxx_thread_local)
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#define LLVM_THREAD_LOCAL thread_local
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#elif defined(_MSC_VER)
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// MSVC supports this with a __declspec.
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#define LLVM_THREAD_LOCAL __declspec(thread)
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#else
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// Clang, GCC, and other compatible compilers used __thread prior to C++11 and
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// we only need the restricted functionality that provides.
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#define LLVM_THREAD_LOCAL __thread
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#endif
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#else // !LLVM_ENABLE_THREADS
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// If threading is disabled entirely, this compiles to nothing and you get
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// a normal global variable.
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#define LLVM_THREAD_LOCAL
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#endif
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#endif
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