add lab answers

labcodes_answer/lab1_result/kern/debug/assert.h

@@ -0,0 +1,27 @@
+#ifndef __KERN_DEBUG_ASSERT_H__
+#define __KERN_DEBUG_ASSERT_H__
+
+#include <defs.h>
+
+void __warn(const char *file, int line, const char *fmt, ...);
+void __noreturn __panic(const char *file, int line, const char *fmt, ...);
+
+#define warn(...)                                       \
+    __warn(__FILE__, __LINE__, __VA_ARGS__)
+
+#define panic(...)                                      \
+    __panic(__FILE__, __LINE__, __VA_ARGS__)
+
+#define assert(x)                                       \
+    do {                                                \
+        if (!(x)) {                                     \
+            panic("assertion failed: %s", #x);          \
+        }                                               \
+    } while (0)
+
+// static_assert(x) will generate a compile-time error if 'x' is false.
+#define static_assert(x)                                \
+    switch (x) { case 0: case (x): ; }
+
+#endif /* !__KERN_DEBUG_ASSERT_H__ */
+