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130 lines
4.4 KiB
C++
130 lines
4.4 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_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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#ifdef __GNUC__ // aka 'ATTRIBUTE_CONST' but following LLVM Conventions.
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#define LLVM_ATTRIBUTE_READNONE __attribute__((__const__))
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#else
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#define LLVM_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 LLVM_ATTRIBUTE_READONLY __attribute__((__pure__))
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#else
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#define LLVM_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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// 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 __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_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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#endif
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