#ifndef UTIL_MACROS_H
#define UTIL_MACROS_H
+#include <assert.h>
+
+#include "c99_compat.h"
+
/* Compute the size of an array */
#ifndef ARRAY_SIZE
# define ARRAY_SIZE(x) (sizeof(x) / sizeof(*(x)))
#define assume(expr) assert(expr)
#endif
+/* Attribute const is used for functions that have no effects other than their
+ * return value, and only rely on the argument values to compute the return
+ * value. As a result, calls to it can be CSEed. Note that using memory
+ * pointed to by the arguments is not allowed for const functions.
+ */
+#ifdef HAVE_FUNC_ATTRIBUTE_CONST
+#define ATTRIBUTE_CONST __attribute__((__const__))
+#else
+#define ATTRIBUTE_CONST
+#endif
+
#ifdef HAVE_FUNC_ATTRIBUTE_FLATTEN
#define FLATTEN __attribute__((__flatten__))
#else
#define PACKED
#endif
+/* Attribute pure is used for functions that have no effects other than their
+ * return value. As a result, calls to it can be dead code eliminated.
+ */
+#ifdef HAVE_FUNC_ATTRIBUTE_PURE
+#define ATTRIBUTE_PURE __attribute__((__pure__))
+#else
+#define ATTRIBUTE_PURE
+#endif
+
+#ifdef HAVE_FUNC_ATTRIBUTE_RETURNS_NONNULL
+#define ATTRIBUTE_RETURNS_NONNULL __attribute__((__returns_nonnull__))
+#else
+#define ATTRIBUTE_RETURNS_NONNULL
+#endif
+
#ifdef __cplusplus
/**
* Macro function that evaluates to true if T is a trivially
* performs no action and all member variables and base classes are
* trivially destructible themselves.
*/
-# if defined(__GNUC__)
+# if (defined(__clang__) && defined(__has_feature))
+# if __has_feature(has_trivial_destructor)
+# define HAS_TRIVIAL_DESTRUCTOR(T) __has_trivial_destructor(T)
+# endif
+# elif defined(__GNUC__)
# if ((__GNUC__ > 4) || ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 3)))
# define HAS_TRIVIAL_DESTRUCTOR(T) __has_trivial_destructor(T)
# endif
-# elif (defined(__clang__) && defined(__has_feature))
-# if __has_feature(has_trivial_destructor)
+# elif defined(_MSC_VER) && !defined(__INTEL_COMPILER)
+# if _MSC_VER >= 1800
# define HAS_TRIVIAL_DESTRUCTOR(T) __has_trivial_destructor(T)
# endif
# endif
* inline a static function that we later use in an alias. - ajax
*/
#ifndef PUBLIC
-# if defined(__GNUC__) || (defined(__SUNPRO_C) && (__SUNPRO_C >= 0x590))
+# if defined(__GNUC__)
# define PUBLIC __attribute__((visibility("default")))
# define USED __attribute__((used))
# elif defined(_MSC_VER)
#define UNUSED
#endif
+#define MAYBE_UNUSED UNUSED
+
+#ifdef HAVE_FUNC_ATTRIBUTE_WARN_UNUSED_RESULT
+#define MUST_CHECK __attribute__((warn_unused_result))
+#else
+#define MUST_CHECK
+#endif
+
+#if defined(__GNUC__)
+#define ATTRIBUTE_NOINLINE __attribute__((noinline))
+#else
+#define ATTRIBUTE_NOINLINE
+#endif
+
+/** Compute ceiling of integer quotient of A divided by B. */
+#define DIV_ROUND_UP( A, B ) ( (A) % (B) == 0 ? (A)/(B) : (A)/(B)+1 )
+
+/** Clamp X to [MIN,MAX] */
+#define CLAMP( X, MIN, MAX ) ( (X)<(MIN) ? (MIN) : ((X)>(MAX) ? (MAX) : (X)) )
+
+/** Minimum of two values: */
+#define MIN2( A, B ) ( (A)<(B) ? (A) : (B) )
+
+/** Maximum of two values: */
+#define MAX2( A, B ) ( (A)>(B) ? (A) : (B) )
+
+/** Minimum and maximum of three values: */
+#define MIN3( A, B, C ) ((A) < (B) ? MIN2(A, C) : MIN2(B, C))
+#define MAX3( A, B, C ) ((A) > (B) ? MAX2(A, C) : MAX2(B, C))
#endif /* UTIL_MACROS_H */