Portal | Manuals | References | Downloads | Info | Programs | JCLs | Master the Mainframes
IBM Mainframe Computers Forums Index
 
Register
 
IBM Mainframe Computers Forums Index Mainframe: Search IBM Mainframe Forum: FAQ Memberlist Usergroups Profile Log in to check your private messages Log in
 

 

Decompiling" a mainframe cobol executable module.

 
Post new topic   Reply to topic    IBMMAINFRAMES.com Support Forums -> CICS
View previous topic :: :: View next topic  
Author Message
wang_f_y1
Warnings : 1

New User


Joined: 16 May 2008
Posts: 42
Location: shenzhen

PostPosted: Wed Sep 09, 2009 2:07 pm    Post subject: Decompiling" a mainframe cobol executable module.
Reply with quote

how to get original cobol source by decompiling a mainframe cobol executable module.

you know we have only a mainframe cobol executable module in some situation,if we want to get orignal source,how can we do?
Back to top
View user's profile Send private message

enrico-sorichetti

Global Moderator


Joined: 14 Mar 2007
Posts: 10231
Location: italy

PostPosted: Wed Sep 09, 2009 2:26 pm    Post subject: Reply to: Decompiling" a mainframe cobol executable mod
Reply with quote

the <thing> has been debated a few times, it cannot be done without specific skills, knowledge, tools

just some hints why...

1) You would need to delink the load module, which means split it into separate csects

2) find out the User code csects, main and subroutines

3) isolate the language related instruction patterns,
very tricky because they depaend on the cobol compiler used and the optimizations carried on...

... add as many issues as You like

if Your organization has the need there are providers who can do it
for example http://www.source-recovery.com/gFAQ.htm
I am not endorsing nor advertising just posting one random link from those found googling for COBOL DISASSEMBLY
Back to top
View user's profile Send private message
Robert Sample

Global Moderator


Joined: 06 Jun 2008
Posts: 7990
Location: Bellevue, IA

PostPosted: Wed Sep 09, 2009 3:10 pm    Post subject:
Reply with quote

To slightly expand upon enrico's answer, you cannot recover the original source from the load module -- COBOL does not retain variable names, for example, in the load module. You can disassemble the load module into assembler code, and possibly even into COBOL code but the code you get will be strange since it will be mechanically produced. The logic will be the same but you'll spend a lot of time figuring out what was generated.
Back to top
View user's profile Send private message
View previous topic :: :: View next topic  
Post new topic   Reply to topic    IBMMAINFRAMES.com Support Forums -> CICS All times are GMT + 6 Hours
Page 1 of 1

 

Search our Forum:

Similar Topics
Topic Author Forum Replies Posted
No new posts FTP from Mainframe to Unix - with CRLF vasanthz All Other Mainframe Topics 1 Thu Mar 23, 2017 5:12 am
No new posts Want to pull the job log into a Mainf... Jishu Mukherjee Compuware & Other Tools 9 Tue Mar 21, 2017 4:48 pm
No new posts Innovations in Your Mainframe Sort Arun Raj PC Guides & IT News 4 Wed Mar 15, 2017 10:38 pm
No new posts SQL query not working in Cobol program. CuriousMainframer COBOL Programming 14 Wed Feb 22, 2017 5:56 pm
No new posts Execute TSO ACF commands from COBOL-I... supreethi.srid TSO/ISPF 0 Tue Feb 21, 2017 5:19 pm


Facebook
Back to Top
 
Mainframe Wiki | Forum Rules | Bookmarks | Subscriptions | FAQ | Tutorials | Contact Us