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llvm-mirror/include/llvm/Support/Compiler.h
Nathan James 5699686601 [NFC] Enable RVALUE_REFERENCE_THIS on MSVC 2019 
In https://reviews.llvm.org/D72948 This was enabled for all MSVC but reverted as it was determined not to work on some 2017 versions.
The issue is assumed to be fixed on 2019 so enable for 2019 and newer.

Some testing could be done to determine which version of MSVC 2017 support this feature but its safer right now to leave it at 2019.

Reviewed By: aaron.ballman

Differential Revision: https://reviews.llvm.org/D98809
2021-03-23 16:40:13 +00:00

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//===-- llvm/Support/Compiler.h - Compiler abstraction support --*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file defines several macros, based on the current compiler. This allows
// use of compiler-specific features in a way that remains portable. This header
// can be included from either C or C++.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_SUPPORT_COMPILER_H
#define LLVM_SUPPORT_COMPILER_H
#include "llvm/Config/llvm-config.h"
#ifdef __cplusplus
#include <new>
#endif
#include <stddef.h>
#if defined(_MSC_VER)
#include <sal.h>
#endif
#ifndef __has_feature
# define __has_feature(x) 0
#endif
#ifndef __has_extension
# define __has_extension(x) 0
#endif
#ifndef __has_attribute
# define __has_attribute(x) 0
#endif
#ifndef __has_builtin
# define __has_builtin(x) 0
#endif
// Only use __has_cpp_attribute in C++ mode. GCC defines __has_cpp_attribute in
// C mode, but the :: in __has_cpp_attribute(scoped::attribute) is invalid.
#ifndef LLVM_HAS_CPP_ATTRIBUTE
#if defined(__cplusplus) && defined(__has_cpp_attribute)
# define LLVM_HAS_CPP_ATTRIBUTE(x) __has_cpp_attribute(x)
#else
# define LLVM_HAS_CPP_ATTRIBUTE(x) 0
#endif
#endif
/// \macro LLVM_GNUC_PREREQ
/// 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 LLVM_GNUC_PREREQ(maj, min, patch) 0
# endif
#endif
/// \macro LLVM_MSC_PREREQ
/// Is the compiler MSVC of at least the specified version?
/// The common \param version values to check for are:
/// * 1910: VS2017, version 15.1 & 15.2
/// * 1911: VS2017, version 15.3 & 15.4
/// * 1912: VS2017, version 15.5
/// * 1913: VS2017, version 15.6
/// * 1914: VS2017, version 15.7
/// * 1915: VS2017, version 15.8
/// * 1916: VS2017, version 15.9
/// * 1920: VS2019, version 16.0
/// * 1921: VS2019, version 16.1
#ifdef _MSC_VER
#define LLVM_MSC_PREREQ(version) (_MSC_VER >= (version))
// We require at least MSVC 2017.
#if !LLVM_MSC_PREREQ(1910)
#error LLVM requires at least MSVC 2017.
#endif
#else
#define LLVM_MSC_PREREQ(version) 0
#endif
/// Does the compiler support ref-qualifiers for *this?
///
/// Sadly, this is separate from just rvalue reference support because GCC
/// and MSVC implemented this later than everything else. This appears to be
/// corrected in MSVC 2019 but not MSVC 2017.
#if __has_feature(cxx_rvalue_references) || LLVM_GNUC_PREREQ(4, 8, 1) || \
LLVM_MSC_PREREQ(1920)
#define LLVM_HAS_RVALUE_REFERENCE_THIS 1
#else
#define LLVM_HAS_RVALUE_REFERENCE_THIS 0
#endif
/// Expands to '&' if ref-qualifiers for *this are supported.
///
/// This can be used to provide lvalue/rvalue overrides of member functions.
/// The rvalue override should be guarded by LLVM_HAS_RVALUE_REFERENCE_THIS
#if LLVM_HAS_RVALUE_REFERENCE_THIS
#define LLVM_LVALUE_FUNCTION &
#else
#define LLVM_LVALUE_FUNCTION
#endif
/// LLVM_LIBRARY_VISIBILITY - If a class marked with this attribute is linked
/// into a shared library, then the class should be private to the library and
/// 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.
///
/// LLVM_EXTERNAL_VISIBILITY - classes, functions, and variables marked with
/// this attribute will be made public and visible outside of any shared library
/// they are linked in to.
#if (__has_attribute(visibility) || LLVM_GNUC_PREREQ(4, 0, 0)) && \
!defined(__MINGW32__) && !defined(__CYGWIN__) && !defined(_WIN32)
#define LLVM_LIBRARY_VISIBILITY __attribute__ ((visibility("hidden")))
#define LLVM_EXTERNAL_VISIBILITY __attribute__ ((visibility("default")))
#else
#define LLVM_LIBRARY_VISIBILITY
#define LLVM_EXTERNAL_VISIBILITY
#endif
#if defined(__GNUC__)
#define LLVM_PREFETCH(addr, rw, locality) __builtin_prefetch(addr, rw, locality)
#else
#define LLVM_PREFETCH(addr, rw, locality)
#endif
#if __has_attribute(used) || LLVM_GNUC_PREREQ(3, 1, 0)
#define LLVM_ATTRIBUTE_USED __attribute__((__used__))
#else
#define LLVM_ATTRIBUTE_USED
#endif
/// LLVM_NODISCARD - Warn if a type or return value is discarded.
// Use the 'nodiscard' attribute in C++17 or newer mode.
#if defined(__cplusplus) && __cplusplus > 201402L && LLVM_HAS_CPP_ATTRIBUTE(nodiscard)
#define LLVM_NODISCARD [[nodiscard]]
#elif LLVM_HAS_CPP_ATTRIBUTE(clang::warn_unused_result)
#define LLVM_NODISCARD [[clang::warn_unused_result]]
// Clang in C++14 mode claims that it has the 'nodiscard' attribute, but also
// warns in the pedantic mode that 'nodiscard' is a C++17 extension (PR33518).
// Use the 'nodiscard' attribute in C++14 mode only with GCC.
// TODO: remove this workaround when PR33518 is resolved.
#elif defined(__GNUC__) && LLVM_HAS_CPP_ATTRIBUTE(nodiscard)
#define LLVM_NODISCARD [[nodiscard]]
#else
#define LLVM_NODISCARD
#endif
// Indicate that a non-static, non-const C++ member function reinitializes
// the entire object to a known state, independent of the previous state of
// the object.
//
// The clang-tidy check bugprone-use-after-move recognizes this attribute as a
// marker that a moved-from object has left the indeterminate state and can be
// reused.
#if LLVM_HAS_CPP_ATTRIBUTE(clang::reinitializes)
#define LLVM_ATTRIBUTE_REINITIALIZES [[clang::reinitializes]]
#else
#define LLVM_ATTRIBUTE_REINITIALIZES
#endif
// Some compilers warn about unused functions. When a function is sometimes
// used or not depending on build settings (e.g. a function only called from
// within "assert"), this attribute can be used to suppress such warnings.
//
// However, it shouldn't be used for unused *variables*, as those have a much
// more portable solution:
// (void)unused_var_name;
// Prefer cast-to-void wherever it is sufficient.
#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) || LLVM_GNUC_PREREQ(4, 0, 0)) && \
(!defined(__MINGW32__) && !defined(__CYGWIN__) && !defined(_WIN32))
#define LLVM_ATTRIBUTE_WEAK __attribute__((__weak__))
#else
#define LLVM_ATTRIBUTE_WEAK
#endif
// Prior to clang 3.2, clang did not accept any spelling of
// __has_attribute(const), so assume it is supported.
#if defined(__clang__) || defined(__GNUC__)
// aka 'CONST' but following LLVM Conventions.
#define LLVM_READNONE __attribute__((__const__))
#else
#define LLVM_READNONE
#endif
#if __has_attribute(pure) || defined(__GNUC__)
// aka 'PURE' but following LLVM Conventions.
#define LLVM_READONLY __attribute__((__pure__))
#else
#define LLVM_READONLY
#endif
#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
#define LLVM_LIKELY(EXPR) (EXPR)
#define LLVM_UNLIKELY(EXPR) (EXPR)
#endif
/// LLVM_ATTRIBUTE_NOINLINE - On compilers where we have a directive to do so,
/// mark a method "not for inlining".
#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)
#else
#define LLVM_ATTRIBUTE_NOINLINE
#endif
/// LLVM_ATTRIBUTE_ALWAYS_INLINE - On compilers where we have a directive to do
/// 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) || 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
#else
#define LLVM_ATTRIBUTE_ALWAYS_INLINE inline
#endif
#ifdef __GNUC__
#define LLVM_ATTRIBUTE_NORETURN __attribute__((noreturn))
#elif defined(_MSC_VER)
#define LLVM_ATTRIBUTE_NORETURN __declspec(noreturn)
#else
#define LLVM_ATTRIBUTE_NORETURN
#endif
#if __has_attribute(returns_nonnull) || LLVM_GNUC_PREREQ(4, 9, 0)
#define LLVM_ATTRIBUTE_RETURNS_NONNULL __attribute__((returns_nonnull))
#elif defined(_MSC_VER)
#define LLVM_ATTRIBUTE_RETURNS_NONNULL _Ret_notnull_
#else
#define LLVM_ATTRIBUTE_RETURNS_NONNULL
#endif
/// \macro LLVM_ATTRIBUTE_RETURNS_NOALIAS Used to mark a function as returning a
/// pointer that does not alias any other valid pointer.
#ifdef __GNUC__
#define LLVM_ATTRIBUTE_RETURNS_NOALIAS __attribute__((__malloc__))
#elif defined(_MSC_VER)
#define LLVM_ATTRIBUTE_RETURNS_NOALIAS __declspec(restrict)
#else
#define LLVM_ATTRIBUTE_RETURNS_NOALIAS
#endif
/// LLVM_FALLTHROUGH - Mark fallthrough cases in switch statements.
#if defined(__cplusplus) && __cplusplus > 201402L && LLVM_HAS_CPP_ATTRIBUTE(fallthrough)
#define LLVM_FALLTHROUGH [[fallthrough]]
#elif LLVM_HAS_CPP_ATTRIBUTE(gnu::fallthrough)
#define LLVM_FALLTHROUGH [[gnu::fallthrough]]
#elif __has_attribute(fallthrough)
#define LLVM_FALLTHROUGH __attribute__((fallthrough))
#elif LLVM_HAS_CPP_ATTRIBUTE(clang::fallthrough)
#define LLVM_FALLTHROUGH [[clang::fallthrough]]
#else
#define LLVM_FALLTHROUGH
#endif
/// LLVM_REQUIRE_CONSTANT_INITIALIZATION - Apply this to globals to ensure that
/// they are constant initialized.
#if LLVM_HAS_CPP_ATTRIBUTE(clang::require_constant_initialization)
#define LLVM_REQUIRE_CONSTANT_INITIALIZATION \
[[clang::require_constant_initialization]]
#else
#define LLVM_REQUIRE_CONSTANT_INITIALIZATION
#endif
/// LLVM_GSL_OWNER - Apply this to owning classes like SmallVector to enable
/// lifetime warnings.
#if LLVM_HAS_CPP_ATTRIBUTE(gsl::Owner)
#define LLVM_GSL_OWNER [[gsl::Owner]]
#else
#define LLVM_GSL_OWNER
#endif
/// LLVM_GSL_POINTER - Apply this to non-owning classes like
/// StringRef to enable lifetime warnings.
#if LLVM_HAS_CPP_ATTRIBUTE(gsl::Pointer)
#define LLVM_GSL_POINTER [[gsl::Pointer]]
#else
#define LLVM_GSL_POINTER
#endif
/// LLVM_EXTENSION - Support compilers where we have a keyword to suppress
/// pedantic diagnostics.
#ifdef __GNUC__
#define LLVM_EXTENSION __extension__
#else
#define LLVM_EXTENSION
#endif
// LLVM_ATTRIBUTE_DEPRECATED(decl, "message")
// This macro will be removed.
// Use C++14's attribute instead: [[deprecated("message")]]
#define LLVM_ATTRIBUTE_DEPRECATED(decl, message) [[deprecated(message)]] decl
/// 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) || LLVM_GNUC_PREREQ(4, 5, 0)
# define LLVM_BUILTIN_UNREACHABLE __builtin_unreachable()
#elif defined(_MSC_VER)
# define LLVM_BUILTIN_UNREACHABLE __assume(false)
#endif
/// LLVM_BUILTIN_TRAP - On compilers which support it, expands to an expression
/// which causes the program to exit abnormally.
#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
/// LLVM_BUILTIN_DEBUGTRAP - On compilers which support it, expands to
/// an expression which causes the program to break while running
/// under a debugger.
#if __has_builtin(__builtin_debugtrap)
# define LLVM_BUILTIN_DEBUGTRAP __builtin_debugtrap()
#elif defined(_MSC_VER)
// The __debugbreak intrinsic is supported by MSVC and breaks while
// running under the debugger, and also supports invoking a debugger
// when the OS is configured appropriately.
# define LLVM_BUILTIN_DEBUGTRAP __debugbreak()
#else
// Just continue execution when built with compilers that have no
// support. This is a debugging aid and not intended to force the
// program to abort if encountered.
# define LLVM_BUILTIN_DEBUGTRAP
#endif
/// \macro LLVM_ASSUME_ALIGNED
/// Returns a pointer with an assumed alignment.
#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)
# define LLVM_ASSUME_ALIGNED(p, a) \
(((uintptr_t(p) % (a)) == 0) ? (p) : (LLVM_BUILTIN_UNREACHABLE, (p)))
#else
# define LLVM_ASSUME_ALIGNED(p, a) (p)
#endif
/// \macro LLVM_PACKED
/// Used to specify a packed structure.
/// LLVM_PACKED(
/// struct A {
/// int i;
/// int j;
/// int k;
/// long long l;
/// });
///
/// LLVM_PACKED_START
/// struct B {
/// int i;
/// int j;
/// int k;
/// long long l;
/// };
/// LLVM_PACKED_END
#ifdef _MSC_VER
# define LLVM_PACKED(d) __pragma(pack(push, 1)) d __pragma(pack(pop))
# define LLVM_PACKED_START __pragma(pack(push, 1))
# define LLVM_PACKED_END __pragma(pack(pop))
#else
# define LLVM_PACKED(d) d __attribute__((packed))
# define LLVM_PACKED_START _Pragma("pack(push, 1)")
# define LLVM_PACKED_END _Pragma("pack(pop)")
#endif
/// \macro LLVM_PTR_SIZE
/// A constant integer equivalent to the value of sizeof(void*).
/// Generally used in combination with alignas or when doing computation in the
/// preprocessor.
#ifdef __SIZEOF_POINTER__
# define LLVM_PTR_SIZE __SIZEOF_POINTER__
#elif defined(_WIN64)
# define LLVM_PTR_SIZE 8
#elif defined(_WIN32)
# define LLVM_PTR_SIZE 4
#elif defined(_MSC_VER)
# error "could not determine LLVM_PTR_SIZE as a constant int for MSVC"
#else
# define LLVM_PTR_SIZE sizeof(void *)
#endif
/// \macro LLVM_MEMORY_SANITIZER_BUILD
/// Whether LLVM itself is built with MemorySanitizer instrumentation.
#if __has_feature(memory_sanitizer)
# define LLVM_MEMORY_SANITIZER_BUILD 1
# include <sanitizer/msan_interface.h>
# define LLVM_NO_SANITIZE_MEMORY_ATTRIBUTE __attribute__((no_sanitize_memory))
#else
# define LLVM_MEMORY_SANITIZER_BUILD 0
# define __msan_allocated_memory(p, size)
# define __msan_unpoison(p, size)
# define LLVM_NO_SANITIZE_MEMORY_ATTRIBUTE
#endif
/// \macro LLVM_ADDRESS_SANITIZER_BUILD
/// Whether LLVM itself is built with AddressSanitizer instrumentation.
#if __has_feature(address_sanitizer) || defined(__SANITIZE_ADDRESS__)
# define LLVM_ADDRESS_SANITIZER_BUILD 1
# include <sanitizer/asan_interface.h>
#else
# define LLVM_ADDRESS_SANITIZER_BUILD 0
# define __asan_poison_memory_region(p, size)
# define __asan_unpoison_memory_region(p, size)
#endif
/// \macro LLVM_THREAD_SANITIZER_BUILD
/// Whether LLVM itself is built with ThreadSanitizer instrumentation.
#if __has_feature(thread_sanitizer) || defined(__SANITIZE_THREAD__)
# define LLVM_THREAD_SANITIZER_BUILD 1
#else
# define LLVM_THREAD_SANITIZER_BUILD 0
#endif
#if LLVM_THREAD_SANITIZER_BUILD
// Thread Sanitizer is a tool that finds races in code.
// See http://code.google.com/p/data-race-test/wiki/DynamicAnnotations .
// tsan detects these exact functions by name.
#ifdef __cplusplus
extern "C" {
#endif
void AnnotateHappensAfter(const char *file, int line, const volatile void *cv);
void AnnotateHappensBefore(const char *file, int line, const volatile void *cv);
void AnnotateIgnoreWritesBegin(const char *file, int line);
void AnnotateIgnoreWritesEnd(const char *file, int line);
#ifdef __cplusplus
}
#endif
// This marker is used to define a happens-before arc. The race detector will
// infer an arc from the begin to the end when they share the same pointer
// argument.
# define TsanHappensBefore(cv) AnnotateHappensBefore(__FILE__, __LINE__, cv)
// This marker defines the destination of a happens-before arc.
# define TsanHappensAfter(cv) AnnotateHappensAfter(__FILE__, __LINE__, cv)
// Ignore any races on writes between here and the next TsanIgnoreWritesEnd.
# define TsanIgnoreWritesBegin() AnnotateIgnoreWritesBegin(__FILE__, __LINE__)
// Resume checking for racy writes.
# define TsanIgnoreWritesEnd() AnnotateIgnoreWritesEnd(__FILE__, __LINE__)
#else
# define TsanHappensBefore(cv)
# define TsanHappensAfter(cv)
# define TsanIgnoreWritesBegin()
# define TsanIgnoreWritesEnd()
#endif
/// \macro LLVM_NO_SANITIZE
/// Disable a particular sanitizer for a function.
#if __has_attribute(no_sanitize)
#define LLVM_NO_SANITIZE(KIND) __attribute__((no_sanitize(KIND)))
#else
#define LLVM_NO_SANITIZE(KIND)
#endif
/// Mark debug helper function definitions like dump() that should not be
/// stripped from debug builds.
/// Note that you should also surround dump() functions with
/// `#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)` so they do always
/// get stripped in release builds.
// FIXME: Move this to a private config.h as it's not usable in public headers.
#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
#define LLVM_DUMP_METHOD LLVM_ATTRIBUTE_NOINLINE LLVM_ATTRIBUTE_USED
#else
#define LLVM_DUMP_METHOD LLVM_ATTRIBUTE_NOINLINE
#endif
/// \macro LLVM_PRETTY_FUNCTION
/// Gets a user-friendly looking function signature for the current scope
/// using the best available method on each platform. The exact format of the
/// resulting string is implementation specific and non-portable, so this should
/// only be used, for example, for logging or diagnostics.
#if defined(_MSC_VER)
#define LLVM_PRETTY_FUNCTION __FUNCSIG__
#elif defined(__GNUC__) || defined(__clang__)
#define LLVM_PRETTY_FUNCTION __PRETTY_FUNCTION__
#else
#define LLVM_PRETTY_FUNCTION __func__
#endif
/// \macro LLVM_THREAD_LOCAL
/// 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. It uses thread_local if available, falling back on gcc __thread
/// if not. __thread doesn'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) || defined(_MSC_VER)
#define LLVM_THREAD_LOCAL thread_local
#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
/// \macro LLVM_ENABLE_EXCEPTIONS
/// Whether LLVM is built with exception support.
#if __has_feature(cxx_exceptions)
#define LLVM_ENABLE_EXCEPTIONS 1
#elif defined(__GNUC__) && defined(__EXCEPTIONS)
#define LLVM_ENABLE_EXCEPTIONS 1
#elif defined(_MSC_VER) && defined(_CPPUNWIND)
#define LLVM_ENABLE_EXCEPTIONS 1
#endif
#endif
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