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40b0a148a2
This will be needed for the switch to std::error_code. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210581 91177308-0d34-0410-b5e6-96231b3b80d8
362 lines
12 KiB
C++
362 lines
12 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 __GNUC_PREREQ
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/// \brief Defines __GNUC_PREREQ if glibc's features.h isn't available.
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#ifndef __GNUC_PREREQ
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# if defined(__GNUC__) && defined(__GNUC_MINOR__)
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# define __GNUC_PREREQ(maj, min) \
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((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
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# else
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# define __GNUC_PREREQ(maj, min) 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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/// * 1700: Microsoft Visual Studio 2012 / 11.0
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/// * 1800: Microsoft Visual Studio 2013 / 12.0
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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 2012.
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#if !LLVM_MSC_PREREQ(1700)
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#error LLVM requires at least MSVC 2012.
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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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#ifndef _MSC_VER
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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 r-value reference *this?
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///
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/// Sadly, this is separate from just r-value reference support because GCC
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/// implemented everything but this thus far. No release of GCC yet has support
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/// for this feature so it is enabled with Clang only.
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/// FIXME: This should change to a version check when GCC grows support for it.
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#if __has_feature(cxx_rvalue_references)
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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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/// \macro LLVM_HAS_VARIADIC_TEMPLATES
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/// \brief Does this compiler support variadic templates.
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///
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/// Implies LLVM_HAS_RVALUE_REFERENCES and the existence of std::forward.
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#if __has_feature(cxx_variadic_templates) || LLVM_MSC_PREREQ(1800)
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# define LLVM_HAS_VARIADIC_TEMPLATES 1
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#else
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# define LLVM_HAS_VARIADIC_TEMPLATES 0
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#endif
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/// Expands to '&' if r-value references are supported.
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///
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/// This can be used to provide l-value/r-value overrides of member functions.
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/// The r-value 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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/// LLVM_DELETED_FUNCTION - Expands to = delete if the compiler supports it.
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/// Use to mark functions as uncallable. Member functions with this should
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/// be declared private so that some behavior is kept in C++03 mode.
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///
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/// class DontCopy {
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/// private:
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/// DontCopy(const DontCopy&) LLVM_DELETED_FUNCTION;
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/// DontCopy &operator =(const DontCopy&) LLVM_DELETED_FUNCTION;
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/// public:
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/// ...
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/// };
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#if __has_feature(cxx_deleted_functions) || \
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defined(__GXX_EXPERIMENTAL_CXX0X__) || LLVM_MSC_PREREQ(1800)
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#define LLVM_DELETED_FUNCTION = delete
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#else
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#define LLVM_DELETED_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) || __GNUC_PREREQ(4, 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(used) || __GNUC_PREREQ(3, 1)
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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) || __GNUC_PREREQ(3, 4)
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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) || __GNUC_PREREQ(3, 1)
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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) || __GNUC_PREREQ(4, 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) || __GNUC_PREREQ(4, 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) || __GNUC_PREREQ(3, 4)
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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) || __GNUC_PREREQ(4, 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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/// 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) || __GNUC_PREREQ(4, 5)
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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) || __GNUC_PREREQ(4, 3)
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# define LLVM_BUILTIN_TRAP __builtin_trap()
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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) && __GNUC_PREREQ(4, 7)
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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_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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/// \macro LLVM_IS_UNALIGNED_ACCESS_FAST
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/// \brief Is unaligned memory access fast on the host machine.
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///
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/// Don't specialize on alignment for platforms where unaligned memory accesses
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/// generates the same code as aligned memory accesses for common types.
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#if defined(_M_AMD64) || defined(_M_IX86) || defined(__amd64) || \
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defined(__amd64__) || defined(__x86_64) || defined(__x86_64__) || \
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defined(_X86_) || defined(__i386) || defined(__i386__)
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# define LLVM_IS_UNALIGNED_ACCESS_FAST 1
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#else
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# define LLVM_IS_UNALIGNED_ACCESS_FAST 0
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#endif
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/// \macro LLVM_EXPLICIT
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/// \brief Expands to explicit on compilers which support explicit conversion
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/// operators. Otherwise expands to nothing.
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#if __has_feature(cxx_explicit_conversions) || \
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defined(__GXX_EXPERIMENTAL_CXX0X__) || LLVM_MSC_PREREQ(1800)
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#define LLVM_EXPLICIT explicit
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#else
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#define LLVM_EXPLICIT
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#endif
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/// \brief Does the compiler support generalized initializers (using braced
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/// lists and std::initializer_list). While clang may claim it supports general
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/// initializers, if we're using MSVC's headers, we might not have a usable
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/// std::initializer list type from the STL. Disable this for now.
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#if __has_feature(cxx_generalized_initializers) && !defined(_MSC_VER)
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#define LLVM_HAS_INITIALIZER_LISTS 1
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#else
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#define LLVM_HAS_INITIALIZER_LISTS 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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#endif
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