X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=include%2Fllvm%2FSupport%2FCompiler.h;h=f654f327a923a9d333c781bb82042d1ebd95ad20;hb=5eb301740c4ee5d978535caa917cc004733a7fca;hp=2d2a0b124abe4015bb0e19232639beb931967610;hpb=2f9a9ed785416a7350f30141fcc405b69a1b9d5d;p=oota-llvm.git

diff --git a/include/llvm/Support/Compiler.h b/include/llvm/Support/Compiler.h
index 2d2a0b124ab..f654f327a92 100644
--- a/include/llvm/Support/Compiler.h
+++ b/include/llvm/Support/Compiler.h
@@ -19,6 +19,25 @@
 # define __has_feature(x) 0
 #endif
 
+/// LLVM_HAS_RVALUE_REFERENCES - Does the compiler provide r-value references?
+/// This implies that <utility> provides the one-argument std::move;  it
+/// does not imply the existence of any other C++ library features.
+#if (__has_feature(cxx_rvalue_references)   \
+     || defined(__GXX_EXPERIMENTAL_CXX0X__) \
+     || _MSC_VER >= 1600)
+#define LLVM_USE_RVALUE_REFERENCES 1
+#else
+#define LLVM_USE_RVALUE_REFERENCES 0
+#endif
+
+/// llvm_move - Expands to ::std::move if the compiler supports
+/// r-value references; otherwise, expands to the argument.
+#if LLVM_USE_RVALUE_REFERENCES
+#define llvm_move(value) (::std::move(value))
+#else
+#define llvm_move(value) (value)
+#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
@@ -49,16 +68,22 @@
 #define LLVM_ATTRIBUTE_UNUSED
 #endif
 
-#ifdef __GNUC__ // aka 'ATTRIBUTE_CONST' but following LLVM Conventions.
-#define LLVM_ATTRIBUTE_READNONE __attribute__((__const__))
+#if (__GNUC__ >= 4) && !defined(__MINGW32__) && !defined(__CYGWIN__)
+#define LLVM_ATTRIBUTE_WEAK __attribute__((__weak__))
+#else
+#define LLVM_ATTRIBUTE_WEAK
+#endif
+
+#ifdef __GNUC__ // aka 'CONST' but following LLVM Conventions.
+#define LLVM_READNONE __attribute__((__const__))
 #else
-#define LLVM_ATTRIBUTE_READNONE
+#define LLVM_READNONE
 #endif
 
-#ifdef __GNUC__  // aka 'ATTRIBUTE_PURE' but following LLVM Conventions.
-#define LLVM_ATTRIBUTE_READONLY __attribute__((__pure__))
+#ifdef __GNUC__  // aka 'PURE' but following LLVM Conventions.
+#define LLVM_READONLY __attribute__((__pure__))
 #else
-#define LLVM_ATTRIBUTE_READONLY
+#define LLVM_READONLY
 #endif
 
 #if (__GNUC__ >= 4)
@@ -67,6 +92,7 @@
 #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>);
@@ -95,7 +121,7 @@
 // 3.4 supported this but is buggy in various cases and produces unimplemented
 // errors, just use it in GCC 4.0 and later.
 #if __GNUC__ > 3
-#define LLVM_ATTRIBUTE_ALWAYS_INLINE __attribute__((always_inline))
+#define LLVM_ATTRIBUTE_ALWAYS_INLINE inline __attribute__((always_inline))
 #elif defined(_MSC_VER)
 #define LLVM_ATTRIBUTE_ALWAYS_INLINE __forceinline
 #else
@@ -111,6 +137,14 @@
 #define LLVM_ATTRIBUTE_NORETURN
 #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")
 #if __has_feature(attribute_deprecated_with_message)
 # define LLVM_ATTRIBUTE_DEPRECATED(decl, message) \
@@ -128,17 +162,10 @@
 
 // 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.
+// compiler to reach this point.  Otherwise is not defined.
 #if defined(__clang__) || (__GNUC__ > 4) \
  || (__GNUC__ == 4 && __GNUC_MINOR__ >= 5)
 # define LLVM_BUILTIN_UNREACHABLE __builtin_unreachable()
-#else
-#ifdef __cplusplus
-extern "C" LLVM_ATTRIBUTE_NORETURN void abort();
-#else
-extern LLVM_ATTRIBUTE_NORETURN void abort();
-#endif
-# define LLVM_BUILTIN_UNREACHABLE abort()
 #endif
 
 #endif