initial import of the C runtime

src/runtime/c/gu/assert.h

@@ -0,0 +1,61 @@
+#ifndef GU_ASSERT_H_
+#define GU_ASSERT_H_
+
+#include <gu/defs.h>
+
+typedef enum {
+	GU_ASSERT_PRECOND,
+	GU_ASSERT_ASSERTION,
+	GU_ASSERT_POSTCOND,
+	GU_ASSERT_NEVER
+} GuAssertMode;
+
+void
+gu_abort_v_(GuAssertMode mode, 
+	    const char* file, const char* func, int line,
+	    const char* msg_fmt, va_list args);
+
+void
+gu_abort_(GuAssertMode mode, 
+	  const char* file, const char* func, int line,
+	  const char* msg_fmt, ...);
+
+#ifndef NDEBUG
+#define gu_assertion_(mode_, expr_, ...) \
+	GU_BEGIN							\
+	if (!(expr_)) {							\
+		gu_abort_(mode_, __FILE__, __func__, __LINE__, __VA_ARGS__);	\
+	}								\
+	GU_END
+#else
+// this should prevent unused variable warnings when a variable is only used
+// in an assertion
+#define gu_assertion_(mode_, expr_, ...)	\
+	GU_BEGIN				\
+	(void) (sizeof (expr_));		\
+	GU_END
+#endif
+
+
+#define gu_require(expr)				\
+	gu_assertion_(GU_ASSERT_PRECOND, expr, "%s", #expr)
+
+#define gu_assert_msg(expr, ...)				\
+	gu_assertion_(GU_ASSERT_ASSERTION, expr, __VA_ARGS__)
+
+#define gu_assert(expr)				\
+	gu_assert_msg(expr, "%s", #expr)
+
+#define gu_ensure(expr)						\
+	gu_assertion_(GU_ASSERT_POSTCOND, expr, "%s", #expr)
+
+#define gu_impossible_msg(...)			\
+	gu_assertion_(GU_ASSERT_ASSERTION, false, __VA_ARGS__)
+
+#define gu_impossible()				\
+	gu_impossible_msg(NULL)
+
+void 
+gu_fatal(const char* fmt, ...);
+
+#endif /* GU_ASSERT_H_ */