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+/*
+ * Copyright (c) 2017 Richard Braun.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef _ASSERT_H
+#define _ASSERT_H
+
+#ifdef NDEBUG
+
+/*
+ * The assert() macro normally doesn't produce side effects when turned off,
+ * but this may result in many "set but not used" warnings. Using sizeof()
+ * silences these warnings without producing side effects.
+ */
+#define assert(expression) ((void)sizeof(expression))
+
+#else /* NDEBUG */
+
+#include <lib/macros.h>
+#include <src/panic.h>
+
+/*
+ * Panic if the given expression is false.
+ */
+#define assert(expression)                                          \
+MACRO_BEGIN                                                         \
+    if (unlikely(!(expression))) {                                  \
+        panic("assertion (%s) failed in %s:%d, function %s()",      \
+              __QUOTE(expression), __FILE__, __LINE__, __func__);   \
+    }                                                               \
+MACRO_END
+
+#endif /* NDEBUG */
+
+#endif /* _ASSERT_H */