A traceback is not a trace. An ON unit can display *current* values of a variable, not past values. I have no idea what you mean by "A trace is trivial with PROCEDURENAME." or how it provides a complete history of the program's execution, much less an interface for viewing it selectively.
-- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3 ________________________________________ From: IBM Mainframe Assembler List <[email protected]> on behalf of Robin Vowels <[email protected]> Sent: Tuesday, February 6, 2018 7:30 PM To: [email protected] Subject: Re: Fair comparison C vs HLASM From: "Seymour J Metz" <[email protected]> Sent: Monday, February 05, 2018 7:21 AM > As an example, some debuggers log a trace of the program > and allow you to scroll the log back from the point of failure PL/I provides a traceback. Values of variables can be displayed via an ON-unit. A trace is trivial with PROCEDURENAME. > in order to track down when, where and how variables acquired unexpected > values. ________________________________________ From: IBM Mainframe Assembler List <[email protected]> on behalf of Robin Vowels <[email protected]> Sent: Friday, February 2, 2018 8:07 PM To: [email protected] Subject: Re: Fair comparison C vs HLASM From: "Seymour J Metz" <[email protected]> Sent: Saturday, February 03, 2018 4:08 AM > That deepends on what you mean by debugging facilities. PL/I has features > bthat help in debugging, > but a good debugger has a lot more. Such as? --- This email has been checked for viruses by Avast antivirus software. https://secure-web.cisco.com/1X43gsO1-tAojvlzLeZEDhLK99LItHT-drxM42-QZLfXVzFXBd_Ow2LCznCwEn-e6bXwjufz9lJ1zBi4gi0HNeZJLZglBVR_KGn4v7VlqzzD8cTBAbK2w3dLC4xrZ0lkxRIpvbjrAsFVMDUocLCCC4pdqvYgKjgjaSXIbUqX3kN_qQNQL6LOdJNb5lKK3KtQL7RBEoGdvJ-KdZdhJsep7a6cU5tI2C3mQMWOGJTWkXcwnA5wUXKivavy_FNFixqq07t37djhRMj059JlnStNYKhhi3Ttbs3TQLLMgFs85HWR9CJRqSVVbTXm9SHCH19Xc_ARC8XlbiSGXgFckgn5ZpfKLlZHup5T3OmRewPRJRPD1aToBQB0smj3vYjwCZZjwxtVZS1cXe9sCJBxaenI83-sKQmpS1n1VncRLH9S-Z4Y6BQBBN0EczKdBTEXKXYGb/https%3A%2F%2Fwww.avast.com%2Fantivirus
