custom_gdb_extension.py

@@ -184,18 +184,19 @@ class ListDumpCmd(gdb.Command):
             "list_dump", gdb.COMMAND_USER
         )
 
-    def _print_list(self, val):
+    def _print_list(self, val, next_name):
         """Walk through the linked list.
-
         We will simply follow the 'next' pointers until we encounter the HEAD again
         """
         idx = 0
         head = val
         thread_ptr = val
         result = ""
+
         while thread_ptr != 0 and (idx == 0 or thread_ptr != head):
-            result += gdb.execute('p *({}){}'.format(str(thread_ptr.type),thread_ptr), to_string=True)
-            thread_ptr = thread_ptr["next"]
+            result += gdb.execute('p *({}){}'.format(str(thread_ptr.type),
+                                  thread_ptr), to_string=True)
+            thread_ptr = thread_ptr[next_name]
             idx += 1
         result = ("Found a Linked List with %d items:" % idx) + "\n" + result
         return result
@@ -209,17 +210,21 @@ class ListDumpCmd(gdb.Command):
         # We can pass args here and use Python CLI utilities like argparse
         # to do argument parsing
         print("Args Passed: %s" % args)
-        if args:
-            ptr_val = gdb.parse_and_eval(args)
-        else:
-            ptr_val = gdb.parse_and_eval("currentThread")
+        thread_name = "currentThread"
+        next_name = "next"
+        if(args):
+            args_arr = args.split()
+            thread_name = args_arr[0]
+            if(len(args_arr) >= 2):
+                next_name = args_arr[1]
+        ptr_val = gdb.parse_and_eval(thread_name)
         try:
-            ptr_val["next"]
+            ptr_val[next_name]
         except:
-            print("Expected pointer argument with a next field")
+            print("Expected pointer argument with a %s field" % next_name)
             return
 
-        print(self._print_list(ptr_val))
+        print(self._print_list(ptr_val, next_name))
 
 
 register_pretty_printer(None, CustomPrettyPrinterLocator(), replace=True)