X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=include%2Fllvm%2FSupport%2FCompiler.h;h=fce30e8b7dee5b5a27298a62ae9635a1c5f8ceab;hb=57ac1f458a754f30cf500410b438fb260f9b8fe5;hp=c9cc3da8c3f5429bd20d97eaf7c09bed29293a4d;hpb=f32b3c54f020e9416aa74410d43c2452e57d3ae0;p=oota-llvm.git

diff --git a/include/llvm/Support/Compiler.h b/include/llvm/Support/Compiler.h
index c9cc3da8c3f..fce30e8b7de 100644
--- a/include/llvm/Support/Compiler.h
+++ b/include/llvm/Support/Compiler.h
@@ -19,6 +19,82 @@
 # define __has_feature(x) 0
 #endif
 
+/// \brief Does the compiler support 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__) \
+     || (defined(_MSC_VER) && _MSC_VER >= 1600))
+#define LLVM_HAS_RVALUE_REFERENCES 1
+#else
+#define LLVM_HAS_RVALUE_REFERENCES 0
+#endif
+
+/// \brief Does the compiler support r-value reference *this?
+///
+/// Sadly, this is separate from just r-value reference support because GCC
+/// implemented everything but this thus far. No release of GCC yet has support
+/// for this feature so it is enabled with Clang only.
+/// FIXME: This should change to a version check when GCC grows support for it.
+#if __has_feature(cxx_rvalue_references)
+#define LLVM_HAS_RVALUE_REFERENCE_THIS 1
+#else
+#define LLVM_HAS_RVALUE_REFERENCE_THIS 0
+#endif
+
+/// llvm_move - Expands to ::std::move if the compiler supports
+/// r-value references; otherwise, expands to the argument.
+#if LLVM_HAS_RVALUE_REFERENCES
+#define llvm_move(value) (::std::move(value))
+#else
+#define llvm_move(value) (value)
+#endif
+
+/// Expands to '&' if r-value references are supported.
+///
+/// This can be used to provide l-value/r-value overrides of member functions.
+/// The r-value override should be guarded by LLVM_HAS_RVALUE_REFERENCE_THIS
+#if LLVM_HAS_RVALUE_REFERENCE_THIS
+#define LLVM_LVALUE_FUNCTION &
+#else
+#define LLVM_LVALUE_FUNCTION
+#endif
+
+/// LLVM_DELETED_FUNCTION - Expands to = delete if the compiler supports it.
+/// Use to mark functions as uncallable. Member functions with this should
+/// be declared private so that some behavior is kept in C++03 mode.
+///
+/// class DontCopy {
+/// private:
+///   DontCopy(const DontCopy&) LLVM_DELETED_FUNCTION;
+///   DontCopy &operator =(const DontCopy&) LLVM_DELETED_FUNCTION;
+/// public:
+///   ...
+/// };
+#if (__has_feature(cxx_deleted_functions) \
+     || defined(__GXX_EXPERIMENTAL_CXX0X__))
+     // No version of MSVC currently supports this.
+#define LLVM_DELETED_FUNCTION = delete
+#else
+#define LLVM_DELETED_FUNCTION
+#endif
+
+/// LLVM_FINAL - Expands to 'final' if the compiler supports it.
+/// Use to mark classes or virtual methods as final.
+#if (__has_feature(cxx_override_control))
+#define LLVM_FINAL final
+#else
+#define LLVM_FINAL
+#endif
+
+/// LLVM_OVERRIDE - Expands to 'override' if the compiler supports it.
+/// Use to mark virtual methods as overriding a base class method.
+#if (__has_feature(cxx_override_control))
+#define LLVM_OVERRIDE override
+#else
+#define LLVM_OVERRIDE
+#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
@@ -49,24 +125,33 @@
 #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_READNONE
+#define LLVM_ATTRIBUTE_WEAK
 #endif
 
-#ifdef __GNUC__  // aka 'ATTRIBUTE_PURE' but following LLVM Conventions.
-#define LLVM_ATTRIBUTE_READONLY __attribute__((__pure__))
+#ifdef __GNUC__ // aka 'CONST' but following LLVM Conventions.
+#define LLVM_READNONE __attribute__((__const__))
 #else
-#define LLVM_ATTRIBUTE_READONLY
+#define LLVM_READNONE
+#endif
+
+#ifdef __GNUC__  // aka 'PURE' but following LLVM Conventions.
+#define LLVM_READONLY __attribute__((__pure__))
+#else
+#define LLVM_READONLY
 #endif
 
 #if (__GNUC__ >= 4)
-#define BUILTIN_EXPECT(EXPR, VALUE) __builtin_expect((EXPR), (VALUE))
+#define LLVM_LIKELY(EXPR) __builtin_expect((bool)(EXPR), true)
+#define LLVM_UNLIKELY(EXPR) __builtin_expect((bool)(EXPR), false)
 #else
-#define BUILTIN_EXPECT(EXPR, VALUE) (EXPR)
+#define LLVM_LIKELY(EXPR) (EXPR)
+#define LLVM_UNLIKELY(EXPR) (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>);
@@ -80,8 +165,8 @@
 #define TEMPLATE_INSTANTIATION(X)
 #endif
 
-// LLVM_ATTRIBUTE_NOINLINE - On compilers where we have a directive to do so,
-// mark a method "not for inlining".
+/// LLVM_ATTRIBUTE_NOINLINE - 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 LLVM_ATTRIBUTE_NOINLINE __attribute__((noinline))
 #elif defined(_MSC_VER)
@@ -90,12 +175,12 @@
 #define LLVM_ATTRIBUTE_NOINLINE
 #endif
 
-// LLVM_ATTRIBUTE_ALWAYS_INLINE - On compilers where we have a directive to do
-// so, mark a method "always inline" because it is performance sensitive. GCC
-// 3.4 supported this but is buggy in various cases and produces unimplemented
-// errors, just use it in GCC 4.0 and later.
+/// LLVM_ATTRIBUTE_ALWAYS_INLINE - On compilers where we have a directive to do
+/// so, mark a method "always inline" because it is performance sensitive. GCC
+/// 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 +196,14 @@
 #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) \
@@ -126,19 +219,21 @@
   decl
 #endif
 
-// 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.
+/// 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.  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() throw();
-#else
-extern LLVM_ATTRIBUTE_NORETURN void abort();
 #endif
-# define LLVM_BUILTIN_UNREACHABLE abort()
+
+/// LLVM_BUILTIN_TRAP - On compilers which support it, expands to an expression
+/// which causes the program to exit abnormally.
+#if defined(__clang__) || (__GNUC__ > 4) \
+ || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3)
+# define LLVM_BUILTIN_TRAP __builtin_trap()
+#else
+# define LLVM_BUILTIN_TRAP *(volatile int*)0x11 = 0
 #endif
 
 #endif