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baec6e54f4
mainly used in debugging and/or assert situations. It should make the compiler and the static analyzer stop nagging us about them. llvm-svn: 92181
98 lines
3.0 KiB
C++
98 lines
3.0 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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// The VISIBILITY_HIDDEN macro, used for marking classes with the GCC-specific
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// visibility("hidden") attribute.
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#if (__GNUC__ >= 4) && !defined(__MINGW32__) && !defined(__CYGWIN__)
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#define VISIBILITY_HIDDEN __attribute__ ((visibility("hidden")))
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#else
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#define VISIBILITY_HIDDEN
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#endif
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#if (__GNUC__ >= 4 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 1))
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#define ATTRIBUTE_USED __attribute__((__used__))
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#else
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#define ATTRIBUTE_USED
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#endif
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#if (__GNUC__ >= 4 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 1))
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#define ATTRIBUTE_UNUSED __attribute__((__unused__))
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#else
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#define ATTRIBUTE_UNUSED
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#endif
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#ifdef __GNUC__ // aka 'ATTRIBUTE_CONST' but following LLVM Conventions.
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#define ATTRIBUTE_READNONE __attribute__((__const__))
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#else
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#define ATTRIBUTE_READNONE
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#endif
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#ifdef __GNUC__ // aka 'ATTRIBUTE_PURE' but following LLVM Conventions.
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#define ATTRIBUTE_READONLY __attribute__((__pure__))
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#else
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#define ATTRIBUTE_READONLY
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#endif
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#if (__GNUC__ >= 4)
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#define BUILTIN_EXPECT(EXPR, VALUE) __builtin_expect((EXPR), (VALUE))
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#else
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#define BUILTIN_EXPECT(EXPR, VALUE) (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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// DISABLE_INLINE - On compilers where we have a directive to do so, mark a
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// method "not for inlining".
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#if (__GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4))
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#define DISABLE_INLINE __attribute__((noinline))
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#elif defined(_MSC_VER)
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#define DISABLE_INLINE __declspec(noinline)
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#else
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#define DISABLE_INLINE
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#endif
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// ALWAYS_INLINE - On compilers where we have a directive to do so, mark a
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// method "always inline" because it is performance sensitive.
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#if (__GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4))
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#define ALWAYS_INLINE __attribute__((always_inline))
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#else
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// TODO: No idea how to do this with MSVC.
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#define ALWAYS_INLINE
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#endif
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#ifdef __GNUC__
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#define NORETURN __attribute__((noreturn))
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#elif defined(_MSC_VER)
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#define NORETURN __declspec(noreturn)
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#else
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#define NORETURN
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#endif
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#endif
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