add wrmr.h: common definitions for almost all programs

1 files changed, 61 insertions, 0 deletions

diff --git a/wrmr.h b/wrmr.h
new file mode 100644
index 0000000..fcbfc22
--- /dev/null
+++ b/wrmr.h
@@ -0,0 +1,61 @@
+/* wrmr.h */
+/* common definitions used on most projects */
+
+#ifndef WRMR_H
+#define WRMR_H
+
+#include <stdint.h>
+#include <stddef.h>
+
+typedef int8_t i8;
+typedef int16_t i16;
+typedef int32_t i32;
+typedef int64_t i64;
+
+typedef uint8_t u8;
+typedef uint16_t u16;
+typedef uint32_t u32;
+typedef uint64_t u64;
+
+typedef size_t usize;
+typedef ptrdiff_t isize;
+typedef intptr_t iptr;
+typedef uintptr_t uptr;
+
+#define BESTRING_(x) #x
+#define BESTRING(x) BESTRING_(x)
+
+#define FILE_LINE_MSG(msg) (__FILE__ ":" BESTRING(__LINE__) ": " msg "\n")
+#define FAIL_WITH_MSG(msg) do { fputs(FILE_LINE_MSG(msg), stderr); abort(); } while(0)
+
+#ifndef NDEBUG
+#	define UNREACHABLE_MSG(msg) FAIL_WITH_MSG(msg)
+#else
+
+#if __STDC_VERSION__ >= 202311L
+#	define UNREACHABLE_MSG(msg) (unreachable())
+#elif defined(__GNUC__)
+#	define UNREACHABLE_MSG(msg) (__builtin_unreachable())
+#elif defined(_MSC_VER)
+#	define UNREACHABLE_MSG(msg) (__assume(0))
+#else
+#	define UNREACHABLE_MSG(msg) do {} while(0)
+#endif
+
+#endif
+
+#define UNREACHABLE UNREACHABLE_MSG("unreachable code")
+
+#ifdef NDEBUG
+#	if defined(_MSC_VER)
+#		define ASSUME(...) (__assume(__VA_ARGS__))
+#	elif defined(__clang_version__)
+#		define ASSUME(...) (__builtin_assume(__VA_ARGS__))
+#	endif
+#endif
+
+#ifndef ASSUME
+#	define ASSUME(...) do if (!(__VA_ARGS__)) UNREACHABLE_MSG("assumption failed: " #__VA_ARGS__); while(0);
+#endif
+
+#endif