mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-10-03 08:55:51 +00:00
e20cf3d149
Rationale: For each preprocessor macro, either the definedness is what's meaningful, or the value is what's meaningful, or both. If definedness is meaningful, we should use #ifdef. If the value is meaningful, we should use and #ifdef interchangeably for the same macro, seems ugly to me, even if undefined macros are zero if used. This also has the benefit that including an LLVM header doesn't prevent you from compiling with -Wundef -Werror. Patch by John Garvin! <rdar://problem/12189979> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@163148 91177308-0d34-0410-b5e6-96231b3b80d8
202 lines
6.7 KiB
C++
202 lines
6.7 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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#ifndef __has_feature
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# define __has_feature(x) 0
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#endif
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/// LLVM_HAS_RVALUE_REFERENCES - Does the compiler provide r-value references?
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/// This implies that <utility> provides the one-argument std::move; it
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/// does not imply the existence of any other C++ library features.
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#if (__has_feature(cxx_rvalue_references) \
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|| defined(__GXX_EXPERIMENTAL_CXX0X__) \
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|| (defined(_MSC_VER) && _MSC_VER >= 1600))
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#define LLVM_USE_RVALUE_REFERENCES 1
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#else
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#define LLVM_USE_RVALUE_REFERENCES 0
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#endif
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/// llvm_move - Expands to ::std::move if the compiler supports
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/// r-value references; otherwise, expands to the argument.
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#if LLVM_USE_RVALUE_REFERENCES
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#define llvm_move(value) (::std::move(value))
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#else
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#define llvm_move(value) (value)
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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 behaivor 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__))
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// No version of MSVC currently supports this.
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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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/// 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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#if (__GNUC__ >= 4) && !defined(__MINGW32__) && !defined(__CYGWIN__)
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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 (__GNUC__ >= 4 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 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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// 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 (__GNUC__ >= 4 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 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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#if (__GNUC__ >= 4) && !defined(__MINGW32__) && !defined(__CYGWIN__)
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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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#ifdef __GNUC__ // 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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#ifdef __GNUC__ // 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 (__GNUC__ >= 4)
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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 (__GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 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 __GNUC__ > 3
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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 defined(__clang__) || (__GNUC__ > 4) \
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|| (__GNUC__ == 4 && __GNUC_MINOR__ >= 5)
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# define LLVM_BUILTIN_UNREACHABLE __builtin_unreachable()
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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 defined(__clang__) || (__GNUC__ > 4) \
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|| (__GNUC__ == 4 && __GNUC_MINOR__ >= 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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#endif
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