Import LLVM, at r72732.

1 files changed, 59 insertions, 0 deletions

diff --git a/include/llvm/Support/Compiler.h b/include/llvm/Support/Compiler.h
new file mode 100644
index 0000000..90292df
--- /dev/null
+++ b/include/llvm/Support/Compiler.h
@@ -0,0 +1,59 @@
+//===-- llvm/Support/Compiler.h - Compiler abstraction support --*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines several macros, based on the current compiler.  This allows
+// use of compiler-specific features in a way that remains portable.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_SUPPORT_COMPILER_H
+#define LLVM_SUPPORT_COMPILER_H
+
+// The VISIBILITY_HIDDEN macro, used for marking classes with the GCC-specific
+// visibility("hidden") attribute.
+#if (__GNUC__ >= 4) && !defined(__MINGW32__) && !defined(__CYGWIN__)
+#define VISIBILITY_HIDDEN __attribute__ ((visibility("hidden")))
+#else
+#define VISIBILITY_HIDDEN
+#endif
+
+#if (__GNUC__ >= 4)
+#define ATTRIBUTE_USED __attribute__((__used__))
+#else
+#define ATTRIBUTE_USED
+#endif
+
+#if (__GNUC__ >= 4)
+#define BUILTIN_EXPECT(EXPR, VALUE) __builtin_expect((EXPR), (VALUE))
+#else
+#define BUILTIN_EXPECT(EXPR, VALUE) (EXPR)
+#endif
+
+// C++ doesn't support 'extern template' of template specializations.  GCC does,
+// but requires __extension__ before it.  In the header, use this:
+//   EXTERN_TEMPLATE_INSTANTIATION(class foo<bar>);
+// in the .cpp file, use this:
+//   TEMPLATE_INSTANTIATION(class foo<bar>);
+#ifdef __GNUC__
+#define EXTERN_TEMPLATE_INSTANTIATION(X) __extension__ extern template X
+#define TEMPLATE_INSTANTIATION(X) template X
+#else
+#define EXTERN_TEMPLATE_INSTANTIATION(X)
+#define TEMPLATE_INSTANTIATION(X)
+#endif
+
+// DISABLE_INLINE - On compilers where we have a directive to do so, mark a
+// method "not for inlining".
+#if (__GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4))
+#define DISABLE_INLINE __attribute__((noinline))
+#else
+#define DISABLE_INLINE
+#endif
+
+#endif