> compile NEMU

221220000 张三
Linux zzy 5.15.146.1-microsoft-standard-WSL2 #1 SMP Thu Jan 11 04:09:03 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux
 16:31:32 up 1 day, 15:21,  1 user,  load average: 0.48, 0.41, 0.29

nemu/src/monitor/sdb/watchpoint.c

@@ -110,6 +110,9 @@ WP* get_wp(int NO) {
 
 void free_wp(WP *_wp) {
   WP* wp = del_wp(&head, _wp);
+  if (wp == NULL) {
+    printf("free_wp: no such watchpoint\n");
+  }
   wp->next = free_;
   free_ = wp;
   wp->expr[0] = '\0';