Make unreachable() useful when debugging, and move common macros

1 files changed, 27 insertions, 0 deletions

diff --git a/src/common/macros.h b/src/common/macros.h
new file mode 100644
index 0000000..6daf08f
--- /dev/null
+++ b/src/common/macros.h
@@ -0,0 +1,27 @@
+#ifndef AHOY_COMMON_MACROS_H
+#define AHOY_COMMON_MACROS_H
+
+#define MIN(x, y) ((x) < (y) ? (x) : (y))
+#define MAX(x, y) ((x) > (y) ? (x) : (y))
+
+#define lengthof(a)    (sizeof(a) / sizeof(*(a)))
+#define memeq(x, y, n) (!memcmp(x, y, n))
+#define streq(x, y)    (!strcmp(x, y))
+#define u8eq(x, y)     (!u8cmp(x, y))
+
+#if DEBUG || !defined(unreachable)
+#	if DEBUG
+#		include "cerr.h"
+#		ifdef unreachable
+#			undef unreachable
+#		endif
+#		define unreachable() \
+			diex("%s:%d: hit unreachable in %s()", __FILE__, __LINE__, __func__)
+#	elifdef __clang__
+#		define unreachable() __builtin_unreachable()
+#	else
+#		include <stddef.h>
+#	endif
+#endif
+
+#endif /* !AHOY_COMMON_MACROS_H */