# define __has_builtin(x) 0
#endif
-/// \macro __GNUC_PREREQ
-/// \brief Defines __GNUC_PREREQ if glibc's features.h isn't available.
-#ifndef __GNUC_PREREQ
-# if defined(__GNUC__) && defined(__GNUC_MINOR__)
-# define __GNUC_PREREQ(maj, min) \
- ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
+/// \macro LLVM_GNUC_PREREQ
+/// \brief Extend the default __GNUC_PREREQ even if glibc's features.h isn't
+/// available.
+#ifndef LLVM_GNUC_PREREQ
+# if defined(__GNUC__) && defined(__GNUC_MINOR__) && defined(__GNUC_PATCHLEVEL__)
+# define LLVM_GNUC_PREREQ(maj, min, patch) \
+ ((__GNUC__ << 20) + (__GNUC_MINOR__ << 10) + __GNUC_PATCHLEVEL__ >= \
+ ((maj) << 20) + ((min) << 10) + (patch))
+# elif defined(__GNUC__) && defined(__GNUC_MINOR__)
+# define LLVM_GNUC_PREREQ(maj, min, patch) \
+ ((__GNUC__ << 20) + (__GNUC_MINOR__ << 10) >= ((maj) << 20) + ((min) << 10))
# else
-# define __GNUC_PREREQ(maj, min) 0
+# define LLVM_GNUC_PREREQ(maj, min, patch) 0
# endif
#endif
/// \macro LLVM_MSC_PREREQ
/// \brief Is the compiler MSVC of at least the specified version?
/// The common \param version values to check for are:
-/// * 1600: Microsoft Visual Studio 2010 / 10.0
-/// * 1700: Microsoft Visual Studio 2012 / 11.0
/// * 1800: Microsoft Visual Studio 2013 / 12.0
+/// * 1900: Microsoft Visual Studio 2015 / 14.0
#ifdef _MSC_VER
#define LLVM_MSC_PREREQ(version) (_MSC_VER >= (version))
+
+// We require at least MSVC 2013.
+#if !LLVM_MSC_PREREQ(1800)
+#error LLVM requires at least MSVC 2013.
+#endif
+
#else
#define LLVM_MSC_PREREQ(version) 0
#endif
+#if !defined(_MSC_VER) || defined(__clang__) || LLVM_MSC_PREREQ(1900)
+#define LLVM_NOEXCEPT noexcept
+#else
+#define LLVM_NOEXCEPT
+#endif
+
/// \brief Does the compiler support r-value reference *this?
///
/// Sadly, this is separate from just r-value reference support because GCC
-/// implemented everything but this thus far. No release of GCC yet has support
-/// for this feature so it is enabled with Clang only.
-/// FIXME: This should change to a version check when GCC grows support for it.
-#if __has_feature(cxx_rvalue_references)
+/// implemented this later than everything else.
+#if __has_feature(cxx_rvalue_references) || LLVM_GNUC_PREREQ(4, 8, 1)
#define LLVM_HAS_RVALUE_REFERENCE_THIS 1
#else
#define LLVM_HAS_RVALUE_REFERENCE_THIS 0
#endif
-/// \macro LLVM_HAS_VARIADIC_TEMPLATES
-/// \brief Does this compiler support variadic templates.
-///
-/// Implies LLVM_HAS_RVALUE_REFERENCES and the existence of std::forward.
-#if __has_feature(cxx_variadic_templates) || LLVM_MSC_PREREQ(1800)
-# define LLVM_HAS_VARIADIC_TEMPLATES 1
-#else
-# define LLVM_HAS_VARIADIC_TEMPLATES 0
-#endif
-
/// Expands to '&' if r-value references are supported.
///
/// This can be used to provide l-value/r-value overrides of member functions.
#define LLVM_LVALUE_FUNCTION
#endif
-/// LLVM_DELETED_FUNCTION - Expands to = delete if the compiler supports it.
-/// Use to mark functions as uncallable. Member functions with this should
-/// be declared private so that some behavior is kept in C++03 mode.
-///
-/// class DontCopy {
-/// private:
-/// DontCopy(const DontCopy&) LLVM_DELETED_FUNCTION;
-/// DontCopy &operator =(const DontCopy&) LLVM_DELETED_FUNCTION;
-/// public:
-/// ...
-/// };
-#if __has_feature(cxx_deleted_functions) || \
- defined(__GXX_EXPERIMENTAL_CXX0X__) || LLVM_MSC_PREREQ(1800)
-#define LLVM_DELETED_FUNCTION = delete
-#else
-#define LLVM_DELETED_FUNCTION
-#endif
-
#if __has_feature(cxx_constexpr) || defined(__GXX_EXPERIMENTAL_CXX0X__)
# define LLVM_CONSTEXPR constexpr
#else
/// not accessible from outside it. Can also be used to mark variables and
/// functions, making them private to any shared library they are linked into.
/// On PE/COFF targets, library visibility is the default, so this isn't needed.
-#if (__has_attribute(visibility) || __GNUC_PREREQ(4, 0)) && \
+#if (__has_attribute(visibility) || LLVM_GNUC_PREREQ(4, 0, 0)) && \
!defined(__MINGW32__) && !defined(__CYGWIN__) && !defined(LLVM_ON_WIN32)
#define LLVM_LIBRARY_VISIBILITY __attribute__ ((visibility("hidden")))
#else
#define LLVM_LIBRARY_VISIBILITY
#endif
-#if __has_attribute(used) || __GNUC_PREREQ(3, 1)
+#if __has_attribute(sentinel) || LLVM_GNUC_PREREQ(3, 0, 0)
+#define LLVM_END_WITH_NULL __attribute__((sentinel))
+#else
+#define LLVM_END_WITH_NULL
+#endif
+
+#if __has_attribute(used) || LLVM_GNUC_PREREQ(3, 1, 0)
#define LLVM_ATTRIBUTE_USED __attribute__((__used__))
#else
#define LLVM_ATTRIBUTE_USED
#endif
-#if __has_attribute(warn_unused_result) || __GNUC_PREREQ(3, 4)
+#if __has_attribute(warn_unused_result) || LLVM_GNUC_PREREQ(3, 4, 0)
#define LLVM_ATTRIBUTE_UNUSED_RESULT __attribute__((__warn_unused_result__))
#else
#define LLVM_ATTRIBUTE_UNUSED_RESULT
// more portable solution:
// (void)unused_var_name;
// Prefer cast-to-void wherever it is sufficient.
-#if __has_attribute(unused) || __GNUC_PREREQ(3, 1)
+#if __has_attribute(unused) || LLVM_GNUC_PREREQ(3, 1, 0)
#define LLVM_ATTRIBUTE_UNUSED __attribute__((__unused__))
#else
#define LLVM_ATTRIBUTE_UNUSED
#endif
// FIXME: Provide this for PE/COFF targets.
-#if (__has_attribute(weak) || __GNUC_PREREQ(4, 0)) && \
+#if (__has_attribute(weak) || LLVM_GNUC_PREREQ(4, 0, 0)) && \
(!defined(__MINGW32__) && !defined(__CYGWIN__) && !defined(LLVM_ON_WIN32))
#define LLVM_ATTRIBUTE_WEAK __attribute__((__weak__))
#else
#define LLVM_READONLY
#endif
-#if __has_builtin(__builtin_expect) || __GNUC_PREREQ(4, 0)
+#if __has_builtin(__builtin_expect) || LLVM_GNUC_PREREQ(4, 0, 0)
#define LLVM_LIKELY(EXPR) __builtin_expect((bool)(EXPR), true)
#define LLVM_UNLIKELY(EXPR) __builtin_expect((bool)(EXPR), false)
#else
/// LLVM_ATTRIBUTE_NOINLINE - On compilers where we have a directive to do so,
/// mark a method "not for inlining".
-#if __has_attribute(noinline) || __GNUC_PREREQ(3, 4)
+#if __has_attribute(noinline) || LLVM_GNUC_PREREQ(3, 4, 0)
#define LLVM_ATTRIBUTE_NOINLINE __attribute__((noinline))
#elif defined(_MSC_VER)
#define LLVM_ATTRIBUTE_NOINLINE __declspec(noinline)
/// so, mark a method "always inline" because it is performance sensitive. GCC
/// 3.4 supported this but is buggy in various cases and produces unimplemented
/// errors, just use it in GCC 4.0 and later.
-#if __has_attribute(always_inline) || __GNUC_PREREQ(4, 0)
+#if __has_attribute(always_inline) || LLVM_GNUC_PREREQ(4, 0, 0)
#define LLVM_ATTRIBUTE_ALWAYS_INLINE inline __attribute__((always_inline))
#elif defined(_MSC_VER)
#define LLVM_ATTRIBUTE_ALWAYS_INLINE __forceinline
#define LLVM_ATTRIBUTE_NORETURN
#endif
+#if __has_attribute(returns_nonnull) || LLVM_GNUC_PREREQ(4, 9, 0)
+#define LLVM_ATTRIBUTE_RETURNS_NONNULL __attribute__((returns_nonnull))
+#else
+#define LLVM_ATTRIBUTE_RETURNS_NONNULL
+#endif
+
/// LLVM_EXTENSION - Support compilers where we have a keyword to suppress
/// pedantic diagnostics.
#ifdef __GNUC__
/// LLVM_BUILTIN_UNREACHABLE - On compilers which support it, expands
/// to an expression which states that it is undefined behavior for the
/// compiler to reach this point. Otherwise is not defined.
-#if __has_builtin(__builtin_unreachable) || __GNUC_PREREQ(4, 5)
+#if __has_builtin(__builtin_unreachable) || LLVM_GNUC_PREREQ(4, 5, 0)
# define LLVM_BUILTIN_UNREACHABLE __builtin_unreachable()
#elif defined(_MSC_VER)
# define LLVM_BUILTIN_UNREACHABLE __assume(false)
/// LLVM_BUILTIN_TRAP - On compilers which support it, expands to an expression
/// which causes the program to exit abnormally.
-#if __has_builtin(__builtin_trap) || __GNUC_PREREQ(4, 3)
+#if __has_builtin(__builtin_trap) || LLVM_GNUC_PREREQ(4, 3, 0)
# define LLVM_BUILTIN_TRAP __builtin_trap()
+#elif defined(_MSC_VER)
+// The __debugbreak intrinsic is supported by MSVC, does not require forward
+// declarations involving platform-specific typedefs (unlike RaiseException),
+// results in a call to vectored exception handlers, and encodes to a short
+// instruction that still causes the trapping behavior we want.
+# define LLVM_BUILTIN_TRAP __debugbreak()
#else
# define LLVM_BUILTIN_TRAP *(volatile int*)0x11 = 0
#endif
/// \macro LLVM_ASSUME_ALIGNED
/// \brief Returns a pointer with an assumed alignment.
-#if __has_builtin(__builtin_assume_aligned) && __GNUC_PREREQ(4, 7)
+#if __has_builtin(__builtin_assume_aligned) || LLVM_GNUC_PREREQ(4, 7, 0)
# define LLVM_ASSUME_ALIGNED(p, a) __builtin_assume_aligned(p, a)
#elif defined(LLVM_BUILTIN_UNREACHABLE)
// As of today, clang does not support __builtin_assume_aligned.
# define LLVM_ASSUME_ALIGNED(p, a) (p)
#endif
+/// \macro LLVM_ALIGNAS
+/// \brief Used to specify a minimum alignment for a structure or variable. The
+/// alignment must be a constant integer.
+///
+/// Note that __declspec(align) has special quirks, it's not legal to pass a
+/// structure with __declspec(align) as a formal parameter.
+#ifdef _MSC_VER
+# define LLVM_ALIGNAS(x) __declspec(align(x))
+#elif __GNUC__ && !__has_feature(cxx_alignas) && !LLVM_GNUC_PREREQ(4, 8, 0)
+# define LLVM_ALIGNAS(x) __attribute__((aligned(x)))
+#else
+# define LLVM_ALIGNAS(x) alignas(x)
+#endif
+
/// \macro LLVM_FUNCTION_NAME
/// \brief Expands to __func__ on compilers which support it. Otherwise,
/// expands to a compiler-dependent replacement.
# define LLVM_IS_UNALIGNED_ACCESS_FAST 0
#endif
-/// \macro LLVM_EXPLICIT
-/// \brief Expands to explicit on compilers which support explicit conversion
-/// operators. Otherwise expands to nothing.
-#if __has_feature(cxx_explicit_conversions) || \
- defined(__GXX_EXPERIMENTAL_CXX0X__) || LLVM_MSC_PREREQ(1800)
-#define LLVM_EXPLICIT explicit
-#else
-#define LLVM_EXPLICIT
-#endif
-
-/// \macro LLVM_STATIC_ASSERT
-/// \brief Expands to C/C++'s static_assert on compilers which support it.
-#if __has_feature(cxx_static_assert) || \
- defined(__GXX_EXPERIMENTAL_CXX0X__) || LLVM_MSC_PREREQ(1600)
-# define LLVM_STATIC_ASSERT(expr, msg) static_assert(expr, msg)
-#elif __has_feature(c_static_assert)
-# define LLVM_STATIC_ASSERT(expr, msg) _Static_assert(expr, msg)
-#elif __has_extension(c_static_assert)
-# define LLVM_STATIC_ASSERT(expr, msg) LLVM_EXTENSION _Static_assert(expr, msg)
-#else
-# define LLVM_STATIC_ASSERT(expr, msg)
-#endif
-
-/// \brief Does the compiler support generalized initializers (using braced
-/// lists and std::initializer_list). While clang may claim it supports general
-/// initializers, if we're using MSVC's headers, we might not have a usable
-/// std::initializer list type from the STL. Disable this for now.
-#if __has_feature(cxx_generalized_initializers) && !defined(_MSC_VER)
-#define LLVM_HAS_INITIALIZER_LISTS 1
-#else
-#define LLVM_HAS_INITIALIZER_LISTS 0
-#endif
-
/// \brief Mark debug helper function definitions like dump() that should not be
/// stripped from debug builds.
// FIXME: Move this to a private config.h as it's not usable in public headers.
#define LLVM_DUMP_METHOD LLVM_ATTRIBUTE_NOINLINE
#endif
+/// \macro LLVM_THREAD_LOCAL
+/// \brief A thread-local storage specifier which can be used with globals,
+/// extern globals, and static globals.
+///
+/// This is essentially an extremely restricted analog to C++11's thread_local
+/// support, and uses that when available. However, it falls back on
+/// platform-specific or vendor-provided extensions when necessary. These
+/// extensions don't support many of the C++11 thread_local's features. You
+/// should only use this for PODs that you can statically initialize to
+/// some constant value. In almost all circumstances this is most appropriate
+/// for use with a pointer, integer, or small aggregation of pointers and
+/// integers.
+#if LLVM_ENABLE_THREADS
+#if __has_feature(cxx_thread_local)
+#define LLVM_THREAD_LOCAL thread_local
+#elif defined(_MSC_VER)
+// MSVC supports this with a __declspec.
+#define LLVM_THREAD_LOCAL __declspec(thread)
+#else
+// Clang, GCC, and other compatible compilers used __thread prior to C++11 and
+// we only need the restricted functionality that provides.
+#define LLVM_THREAD_LOCAL __thread
+#endif
+#else // !LLVM_ENABLE_THREADS
+// If threading is disabled entirely, this compiles to nothing and you get
+// a normal global variable.
+#define LLVM_THREAD_LOCAL
+#endif
+
#endif
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