Add a m_SignBit pattern for convenience.

[oota-llvm.git] / include / llvm / Support / Compiler.h

diff --git a/include/llvm/Support/Compiler.h b/include/llvm/Support/Compiler.h
index 5c414f8d5616d38a463049c8a780b53bcd1e2aa1..67f0fd7e0dc6747989dece751db2fc74fcbf0a70 100644 (file)
--- a/include/llvm/Support/Compiler.h
+++ b/include/llvm/Support/Compiler.h
@@ -15,30 +15,50 @@
 #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.
+#ifndef __has_feature
+# define __has_feature(x) 0
+#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
+/// functions, making them private to any shared library they are linked into.
 #if (__GNUC__ >= 4) && !defined(__MINGW32__) && !defined(__CYGWIN__)
-#define VISIBILITY_HIDDEN __attribute__ ((visibility("hidden")))
+#define LLVM_LIBRARY_VISIBILITY __attribute__ ((visibility("hidden")))
 #else
-#define VISIBILITY_HIDDEN
+#define LLVM_LIBRARY_VISIBILITY
 #endif
 
 #if (__GNUC__ >= 4 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 1))
-#define ATTRIBUTE_USED __attribute__((__used__))
+#define LLVM_ATTRIBUTE_USED __attribute__((__used__))
+#else
+#define LLVM_ATTRIBUTE_USED
+#endif
+
+// Some compilers warn about unused functions. When a function is sometimes
+// used or not depending on build settings (e.g. a function only called from
+// within "assert"), this attribute can be used to suppress such warnings.
+//
+// However, it shouldn't be used for unused *variables*, as those have a much
+// more portable solution:
+//   (void)unused_var_name;
+// Prefer cast-to-void wherever it is sufficient.
+#if (__GNUC__ >= 4 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 1))
+#define LLVM_ATTRIBUTE_UNUSED __attribute__((__unused__))
 #else
-#define ATTRIBUTE_USED
+#define LLVM_ATTRIBUTE_UNUSED
 #endif
 
 #ifdef __GNUC__ // aka 'ATTRIBUTE_CONST' but following LLVM Conventions.
-#define ATTRIBUTE_READNONE __attribute__((__const__))
+#define LLVM_ATTRIBUTE_READNONE __attribute__((__const__))
 #else
-#define ATTRIBUTE_READNONE
+#define LLVM_ATTRIBUTE_READNONE
 #endif
 
 #ifdef __GNUC__  // aka 'ATTRIBUTE_PURE' but following LLVM Conventions.
-#define ATTRIBUTE_READONLY __attribute__((__pure__))
+#define LLVM_ATTRIBUTE_READONLY __attribute__((__pure__))
 #else
-#define ATTRIBUTE_READONLY
+#define LLVM_ATTRIBUTE_READONLY
 #endif
 
 #if (__GNUC__ >= 4)
@@ -60,30 +80,50 @@
 #define TEMPLATE_INSTANTIATION(X)
 #endif
 
-// DISABLE_INLINE - 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 DISABLE_INLINE __attribute__((noinline))
+#define LLVM_ATTRIBUTE_NOINLINE __attribute__((noinline))
 #elif defined(_MSC_VER)
-#define DISABLE_INLINE __declspec(noinline)
+#define LLVM_ATTRIBUTE_NOINLINE __declspec(noinline)
 #else
-#define DISABLE_INLINE
+#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.
+#if __GNUC__ > 3
+#define LLVM_ATTRIBUTE_ALWAYS_INLINE __attribute__((always_inline))
+#elif defined(_MSC_VER)
+#define LLVM_ATTRIBUTE_ALWAYS_INLINE __forceinline
+#else
+#define LLVM_ATTRIBUTE_ALWAYS_INLINE
+#endif
+
+
 #ifdef __GNUC__
-#define NORETURN __attribute__((noreturn))
+#define LLVM_ATTRIBUTE_NORETURN __attribute__((noreturn))
 #elif defined(_MSC_VER)
-#define NORETURN __declspec(noreturn)
+#define LLVM_ATTRIBUTE_NORETURN __declspec(noreturn)
 #else
-#define NORETURN
+#define LLVM_ATTRIBUTE_NORETURN
 #endif
 
-#if defined(__GNUC__) && ((__GNUC__ > 4)||(__GNUC__ == 4 && __GNUC_MINOR__ > 2))
-#define ERROR_IF_USED __attribute__((error("wrong usage")))
-#elif defined(__APPLE__)
-#define ERROR_IF_USED __attribute__((unavailable))
+// LLVM_ATTRIBUTE_DEPRECATED(decl, "message")
+#if __has_feature(attribute_deprecated_with_message)
+# define LLVM_ATTRIBUTE_DEPRECATED(decl, message) \
+  decl __attribute__((deprecated(message)))
+#elif defined(__GNUC__)
+# define LLVM_ATTRIBUTE_DEPRECATED(decl, message) \
+  decl __attribute__((deprecated))
+#elif defined(_MSC_VER)
+# define LLVM_ATTRIBUTE_DEPRECATED(decl, message) \
+  __declspec(deprecated(message)) decl
 #else
-#define ERROR_IF_USED
+# define LLVM_ATTRIBUTE_DEPRECATED(decl, message) \
+  decl
 #endif
 
 #endif