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Cobol 5 presentation
This document contains notes from a presentation on COBOL 5.1 given in April 2014 by Michael Erichsen. The presentation covered new features in COBOL 5.1 including support for XML, Unicode, IMS SQL, improved debugging tools using DWARF 4, performance optimizations, and considerations for migrating to COBOL 5.1 such as code and JCL changes and increased compilation storage requirements.
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Cobol 5 presentation
- 1. 11-04-2014 1 COBOL 5.1 Michael Erichsen, April2014 Who is This?
- 2. 11-04-2014 2 What is This? Agenda •XML • Unicode • IMS SQL • Debugging • Performance • Migration
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- 5. 11-04-2014 5 NAME OF andTYPE OF Example NAME OF and TYPE OF Example
- 6. 11-04-2014 6 NAME OF andTYPE OF Example XML GENERATE
- 7. 11-04-2014 7 XML GENERATE SUPPRESS XMLGENERATE SUPPRESS WHEN
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- 9. 11-04-2014 9 XML PARSE withContinued Data • XMLSS parser may not deliver all content on a single XML event – Content may be split across multiple events – Your program logic must concatenate the pieces together • XML-INFORMATION special register (implicit definition) – 01 XML-INFORMATION PICTURE S9(9) USAGE BINARY VALUE 0. • Value for XML events ATTRIBUTE-CHARACTERS and CONTENT-CHARACTERS: – 1: Complete – 2: Incomplete UNBOUNDED
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- 13. 11-04-2014 13 Unicode • New orchanged intrinsic functions • ULENGTH() • UPOS() • USUBSTR() • USUPPLEMENTARY() • UVALID() • UWIDTH() IMS SQL COBOL 5.1
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- 15. 11-04-2014 15 Debugging • TEST compileroptions – OPTIMIZE(0), NOSTGOPT and TEST • Most debugging function – OPTIMIZE > 0, NOSTGOPT and TEST(EJPD) • Better performance, but a few restrictions – OPTIMIZE > 0, STGOPT and TEST(NOEJPD) • Best performance, more restrictions • No more side files – Debug information in NO LOAD class in the load module – Only loaded if requested by debugger DWARF 4 (Common Debug Architecture) • Industry-standard format – Language independent – Extensible – Widely used on Unix, Linux and other operating systems • Advantages – Stable and maintainable debug information format for all languages – Easier to port program analysis and debug applications to z/OS from other DWARF-compliant platforms
- 16. 11-04-2014 16 DWARF 4 (CommonDebug Architecture) • Originally designed along with Unix Executable and Linkable Format (ELF) – But independent of object file formats DWARF Example
- 17. 11-04-2014 17 PERFORMANCE COBOL 5.1 Performance • Leveragecommon optimization technology across multiple languages (COBOL, C/C++, PL/I, …) – New Code generator same as Java • Foundation for support of new hardware features and future System z processors – Exploit latest z/Architecture instructions – Positioning for future 64-bit exploitation • Prioritize which programs to recompile first to gain the "free" improvements
- 18. 11-04-2014 18 New Performance Options •OPTIMIZE(0|1|2) • STGOPT (Storage Optimization) (NO|YES) • HGPR (High preserve of 64-bit registers) (PRESERVE|NOPRESERVE) • AFP (Additional Floating Point) (VOLATILE|NOPVOLATILE) • MAXPCF (Maximum program complexity factor, default 60000) (0-999999) – Warning issued if changing optimization • ARCH(6|7|8|9|10) – Remember your disaster recovery environment! ARCH(6)
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- 22. 11-04-2014 22 Migration • Compilation storage requirements •Code changes • JCL Changes • Testing! Storage Requirements • Compile with less than 80 MB – User abend 4093 REASON CODE=0000001C • Compile with between 80 MB and 200 MB – IEW4000I FETCH… FAILED BECAUSE INSUFFICIENT STORAGE WAS AVAILABLE • Compile with more than 200 MB OK
- 23. 11-04-2014 23 Storage Requirements • Compilewith less than 80 MB – User abend 4093 REASON CODE=0000001C • Compile with between 80 MB and 200 MB – IEW4000I FETCH… FAILED BECAUSE INSUFFICIENT STORAGE WAS AVAILABLE • Compile with more than 200 MB OK • More processor CPU time for compile (5-15 times!) – Too little time => Another strange abend • Working Storage 20% bigger – Reduced by PTF Code Changes • AMODE(24) removed – Expected to be changed before Volvo implementation • FLAGMIG4 option for COBOL V4.2 – Warning diagnostics for obsolete features • SEARCH ALL error in version 4 corrected • Differences between XMLPARSE(COMPAT) and (XMLSS) – Many XML events changed or discontinued – New reserved words • No coexistence with old COBOL
- 24. 11-04-2014 24 TESTING IS VERYIMPORTANT COBOL 5.1 Who is This?
- 25. 11-04-2014 25 WHILE WRAPPING UP… COBOL5.1 Other Changes • Inline comments – *> • Compiler options removed – SIZE – SSRANGE – YEARWINDOW • Load modules PDSE only • SYSMDECK & SYSUT8-SYSUT15 required in JCL • Interoperation with Java 7 supported
- 26. 11-04-2014 26 COBOL 5.1.1 COBOL 5.1 COBOL5.1.1 • Available as PTF’s – COMPILER UI16133/UI16134/UI16135 – RUNTIME UI15839(V1R13) / UI15840(V2R1) • AMODE 24 support has been added – But only for coexistence, not for new functions • Compilation memory requirements reduced • Fix list – http://www- 01.ibm.com/support/docview.wss?uid=swg27041164# 510314
- 27. 11-04-2014 27 More Information • COBOLfor z/OS Home page – http://www- 03.ibm.com/software/products/us/en/entecoboforzos • Enterprise COBOL for z/OS library – http://www- 01.ibm.com/support/docview.wss?uid=swg27036733 • Enterprise COBOL for z/OS resources – http://www- 01.ibm.com/support/docview.wss?uid=swg21634215 COBOL 5.1 Michael Erichsen, April 2014