parse_and_eval ( args ) if str ( node_ptr_val. Print ( "Args Passed: %s" % args ) node_ptr_val = gdb. COMPLETE_SYMBOL def invoke ( self, args, from_tty ): # We can pass args here and use Python CLI utilities like argparse
# internal tab-completion handler for symbols """ idx = 0 node_ptr = val result = "" while node_ptr != 0 : uuid = node_ptr result += " \n %d: Addr: 0x%x, uuid: %s" % ( idx, node_ptr, uuid ) node_ptr = node_ptr idx += 1 result = ( "Found a Linked List with %d nodes:" % idx ) + result return result def complete ( self, text, word ): # We expect the argument passed to be a symbol so fallback to the We will simply follow the 'next' pointers until we encounter NULL COMMAND_USER ) def _uuid_list_to_str ( self, val ): """Walk through the UuidListNode list. Command ): """Prints the ListNode from our example in a nice format!""" def _init_ ( self ): super ( UuidListDumpCmd, self ).
#Debug script python code
The s_list_head in the code above would look something like this:Ĭlass UuidListDumpCmd ( gdb. When we print a structure, GDB will display each of the individual fields. In this series of posts we will explore some of the GDB Python APIs and how they can be used. This allows one to accelerate and in many cases even automate debugging! Manually inspecting hundreds of crashes is no fun … but fortunately, GDB allows users to extend its core functionality in a number of ways, including via its Python API. 1% of devices in a one million device fleet would generate 1000 reports per month! Even once a product makes it into the wild, an issue that appears on. When a new firmware is being QA’d for the first time on hundreds of devices, it’s important to be able to quickly classify the issue so time spent debugging doesn’t cause the schedule to slip.
#Debug script python manual
While all this manual typing may be fine for debugging one crash or issue, it does not scale. (gdb) p s_list_head->next->next->next->next
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