def run()

in commands/FBDebugCommands.py [0:0]

• 26 lines of code
• 3 McCabe index (conditional complexity)

    def run(self, arguments, options):
        commandForObject, ivarName = arguments

        objectAddress = int(fb.evaluateObjectExpression(commandForObject), 0)

        ivarOffsetCommand = '(ptrdiff_t)ivar_getOffset((void*)object_getInstanceVariable((id){}, "{}", 0))'.format(
            objectAddress, ivarName
        )
        ivarOffset = int(fb.evaluateExpression(ivarOffsetCommand), 0)

        # A multi-statement command allows for variables scoped to the command,
        # not permanent in the session like $variables.
        ivarSizeCommand = (
            "unsigned int size = 0;"
            'char *typeEncoding = (char *)ivar_getTypeEncoding((void*)class_getInstanceVariable((Class)object_getClass((id){}), "{}"));'
            "(char *)NSGetSizeAndAlignment(typeEncoding, &size, 0);"
            "size"
        ).format(objectAddress, ivarName)
        ivarSize = int(fb.evaluateExpression(ivarSizeCommand), 0)

        error = lldb.SBError()
        watchpoint = lldb.debugger.GetSelectedTarget().WatchAddress(
            objectAddress + ivarOffset, ivarSize, False, True, error
        )

        if error.Success():
            print(
                "Remember to delete the watchpoint using: watchpoint delete {}".format(
                    watchpoint.GetID()
                )
            )
        else:
            print("Could not create the watchpoint: {}".format(error.GetCString()))