TweetFollow Us on Twitter

LS FORTRAN 3.0, Pt 2
Volume Number:8
Issue Number:2
Column Tag:Jörg's Folder

Language Systems FORTRAN 3.0

By Jörg Langowski, MacTutor Regular Contributing Author

[Due to a bug that showed itself in Quark XPress 3.1, portions of this article were not printed properly in the April/May issue. The relevant portions are reprinted here. Just goes to show, to err is human, but to really foul things up takes a computer. - Ed.]

Language Systems FORTRAN 3.0

FORTRAN 2.1 was already very robust, generated good, fast code, and all in all, allowed programs that ran on mainframes to be ported very quickly to the Macintosh. Also, subroutines could be assigned to menu items, and the runtime system would handle the menu selections automatically for you, files could be OPENed using the standard file dialogs, and many more goodies.

A Multi-dialect FORTRAN

When I opened the 3.0b2 version of the LS FORTRAN (LSF) compiler, amazingly enough I discovered that one could still make substantial improvements to this development system. First of all, Language Systems proved that one can actually make several existing FORTRAN dialects live happily together in one system. Although I have only VAX programs to test here, I believe their claim that Cray, Microsoft, Data General, and of course standard ANSI 77 FORTRAN programs mostly compile without modifications and produce the expected results. There is a whole section of the manual (20 pages, to be precise) devoted to describing the compatibility with other systems, and the changes that may still be necessary for porting the programs. The manual - or rather Karen Rall, who wrote it - “thinks for you”; the Mac user who has never before transferred a FORTRAN program from a mainframe will even get instructions about file-transfer protocols, Macintosh file attributes and VAX record types. There are -vax and -cray compiler switches for porting programs from those respective machines. Even the VAX pre-connected filenames SYS$INPUT, SYS$OUTPUT, SYS$PRINT and SYS$ERROR are supported. Also, all Microsoft compiler directives are recognized and respected, if possible

But porting programs is not the whole story. You’ll want to develop new programs, test out those bugs, and for that part LSF now adds new debugging options. Of course, the trace and dump options always existed which would trace subroutine entry and exit, and allow to dump variable values to the output screen. Now there is the new -debug compiler switch with four levels: debug=1 adds code that displays the file name and source line number where a runtime error occurred; and when you press the caps lock key during execution, a window pops up where the source line numbers that are being executed flash by. At debug=2, in addition, the heap is checked at the end of each subroutine, and at level 3, after each line of source code.

Of course, you can generate symbol tables for use with SADE, to have source code level debugging.

Toolbox Calling Conventions

The Mac toolbox interface has been improved even further. Now, when you declare functions as PEXTERNAL or CEXTERNAL, character constants passed as arguments are automatically converted to the Pascal (length byte followed by text) or C format (zero-terminated string). The names of PEXTERNAL routines are always passed to the linker in upper case, regardless of the case sensitivity of the FORTRAN compiler chosen (ignore case or case-sensitive), and CEXTERNAL names are always passed in case-sensitive format. These are the formats that the linker expects for C and Pascal. You can declare variables GLOBAL, which means they are application globals referenced from A5; again, to match the Pascal and C naming conventions, you can use the PGLOBAL and CGLOBAL declarations.

System 7

As promised, the new LS FORTRAN supports AppleEvents. The runtime library includes code that automatically recognizes the four required AppleEvents, ‘oapp’, ‘odoc’, ‘pdoc’, and ‘quit’ (see this column in V7#11). If you compile a FORTRAN program with the background processing option, it will react when another program sends it an AppleEvent. As an example, I have listed two programs provided on the LSF disks: the main program opens a second application, sends it some data via an intermediate file, and the second application transfers the processed data back to the main program and quits.

The inclusion of AppleEvents in LSF opens up a whole range of perspectives: for instance, one could imagine a ‘compute server’, a Quadra for example, sitting somewhere on the network with a math library, comprising lots of tiny applications, and programs on other Macintoshes that use this library. Or a way of distributed processing on the network, where a CPU-intensive program can ‘steal’ time from other machines when they are not being used. The routine F_OpenDocWaiting() is used to synchronize such parallel processes; it will continue only when the program has received an ‘odoc’ event. A very rudimentary but effective way of parallel processing.

Although (up to now) only the four required AppleEvents are recognized automatically by the FORTRAN runtime library, you can send any event you like, as shown in the third example. HyperCard 2.1 understands the event ‘dosc’ which will make it execute a HyperTalk script contained in the event’s data. The program sets up such a script and sends it to HyperCard; if you don’t have HyperCard opened, it will issue an error message. When you have HyperCard running and start the program, you’ll hear one beep and see the card window disappear and reappear. Very impressive.

The edition manager of System 7 is also supported in a way; you can publish a FORTRAN-created file by executing CLOSE(UNIT=iunit, STATUS=’PUBLISH’). ‘Subscribing’ to such a ‘published’ document from another program that supports the edition manager means that changes made by the publisher to the document are automatically reflected in the version of the document opened by the other program (I’ll give an introduction to the Edition manager in a later column, haven’t fully under-stood it myself yet).

The last System 7 feature that has been included into LSF 3.0 is alias support. If you open an alias to a file from within a FORTRAN program, the original file will be accessed, just as you would expect.

New Compiler Options

The compiler includes support for generating 68040-specific code, and the optimizer has been improved. As far as I could tell from some limited comparisons (comparing the assembly output generated for the Linpack and Matmult benchmarks, see V7#1), the code generated for the 68040 looks extremely similar to the 68030 code, except for some floating point FMOVE instructions, which are different. I’ll check whether there is a large speed difference on a 68040 between code compiled with the -mc68030 and the -mc68040 options as soon as I have access to a Quadra.

The quality of the code has improved from version 2.1. The Linpack and matrix multiplication benchmarks (V7#1) now run at the same speed as the Absoft MacFortranII compiled versions, although the Whetstone benchmark is still 20% slower. Note, however, that Absoft is much slower if you insist on full Pascal calling conventions, which is standard in LSF.

The most striking difference between the code created by the LSF and the Absoft compiler occurred when I ran a program called “Paranoia” which tests the accuracy and consistency of math operations. While LSF at opt=3 passed all the tests with no problems reported, Absoft’s code (with the basic optimizations) reported a lot of errors and got stuck halfway through. I include the two compiled versions on the source code disk so you can see for yourself.

At this moment, LSF seems to be superior to Absoft FORTRAN in almost all aspects, from the quality of the code to the Macintosh environment, to System 7 support; there may still be a slight disadvantage for integer-computation intensive programs (not for floating point). The new Absoft FORTRAN should be out by now, so we’ll soon see what that brings. From the information they gave in their ad, especially the 68040 support looks very interesting; however, the AppleEvents support is unique to LSF.

Other Features

There are many other improvements made in LSF 3.0 that you notice browsing through the manual, most often printed in boldface text because they are nonstandard extensions. The chapter about optimization was missing from my beta manual; it would have been interesting to see what they actually changed to get the better performance, but I’ll have to wait for the final version. There is a long appendix on how to use HyperCard as a front end to FORTRAN applications, which should be especially interesting under System 7, where both HyperCard and FORTRAN programs can pass AppleEvents to each other. Of course, you can still write XCMDs in FORTRAN, as was always possible. Also, 4th Dimension external commands are supported. All in all, there is almost no reason anymore why seasoned FORTRAN programmers should learn Pascal or C (although I do like C++).

For more information, contact:

Language Systems Corporation

441 Carlisle Drive, Herndon, VA 22070-4802

800-2-LANGSYS or 703-478-0181, 703-689-9593 (fax)

AppleLink: LANGSYS, America Online: LANGSYS

Retail Price: $595 w/MPW, $495 w/o MPW

FORTRAN Upgrades: $100, MPW Upgrades: $50

 

Community Search:
MacTech Search:

Software Updates via MacUpdate

Together 3.7 - Store and organize all of...
Together helps you organize your Mac, giving you the ability to store, edit and preview your files in a single clean, uncluttered interface. Features Smart storage. With simple drag-and-drop... Read more
EtreCheck 3.1.4 - For troubleshooting yo...
EtreCheck is an app that displays the important details of your system configuration and allow you to copy that information to the Clipboard. It is meant to be used with Apple Support Communities to... Read more
Postbox 5.0.9 - Powerful and flexible em...
Postbox is a new email application that helps you organize your work life and get stuff done. It has all the elegance and simplicity of Apple Mail, but with more power and flexibility to manage even... Read more
DiskCatalogMaker 6.5.16 - Catalog your d...
DiskCatalogMaker is a simple disk management tool which catalogs disks. Simple, light-weight, and fast. Finder-like intuitive look and feel. Super-fast search algorithm. Can compress catalog data... Read more
TrailRunner 3.8.827 - Route planning for...
TrailRunner is the perfect companion for runners, bikers, hikers, and all people wandering under the sky. Plan routes on a geographical map. Import GPS or workout recordings and journalize your... Read more
VueScan 9.5.61 - Scanner software with a...
VueScan is a scanning program that works with most high-quality flatbed and film scanners to produce scans that have excellent color fidelity and color balance. VueScan is easy to use, and has... Read more
Postbox 5.0.9 - Powerful and flexible em...
Postbox is a new email application that helps you organize your work life and get stuff done. It has all the elegance and simplicity of Apple Mail, but with more power and flexibility to manage even... Read more
VueScan 9.5.61 - Scanner software with a...
VueScan is a scanning program that works with most high-quality flatbed and film scanners to produce scans that have excellent color fidelity and color balance. VueScan is easy to use, and has... Read more
DiskCatalogMaker 6.5.16 - Catalog your d...
DiskCatalogMaker is a simple disk management tool which catalogs disks. Simple, light-weight, and fast. Finder-like intuitive look and feel. Super-fast search algorithm. Can compress catalog data... Read more
TrailRunner 3.8.827 - Route planning for...
TrailRunner is the perfect companion for runners, bikers, hikers, and all people wandering under the sky. Plan routes on a geographical map. Import GPS or workout recordings and journalize your... Read more

Latest Forum Discussions

See All

Great zombie games in the spirit of Dead...
Dead Rising 4 arrives tomorrow, giving enthusiasts a fresh chance to take selfies with zombies and get up to other ridiculous end-of-the-world shenanigans. To really get into the spirit of things, we've gone and gathered the best zombie games that... | Read more »
Amateur Surgeon 4 Guide: Advanced tips a...
Amateur Surgeon 4 is still tackling the competition at the top of the App Store charts, so if you haven't tried it out yet, you should probably do that right away. If you've been at it for a while, though, perhaps you're ready to start expanding... | Read more »
Amateur Surgeon 4 Guide: Become the worl...
It's time to wield your trusty pizza cutter again, as Amateur Surgeon has returned with a whole fresh set of challenges (and some old, familiar ones, too). Starting anew isn't easy, especially when all you have at your disposal is a lighter, the... | Read more »
Le Parker: Sous Chef Extraordinaire (Ga...
Le Parker: Sous Chef Extraordinaire 1.0 Device: iOS Universal Category: Games Price: $2.99, Version: 1.0 (iTunes) Description: | Read more »
Telltale Games really is working on a Gu...
Telltale Games' next episodic adventure is indeed Guardians of the Galaxy. A document tied to the voice actors strike suggested that the project was in the work, but now we have direct confirmation following an announcement at the Game Awards that... | Read more »
Amateur Surgeon returns to iOS and Andro...
Amateur Surgeon and its two sequels disappeared from the App Store some time and it was sad days for all. But now, just in time for the holidays, the Adult Swim favorite makes its joyous return in the shape of Amateur Surgeon 4, a remake with... | Read more »
The best board games on mobile
Sometimes you need to ditch all of the high speed, high action games in favor of something a little more traditional. If you don't feel like parting ways from your mobile device, though, there are still plenty of ways to get that old-school fix.... | Read more »
The best Facebook Messenger Instant Game...
Facebook's new Instant Games is now here, meaning you can play games with your friends directly via Facebook. It's a fun new way to connect with friends, of course, but it's also proving to be a solid gaming experience in its own right, with a... | Read more »
You can now play game's on Facebook...
Facebook launched its new Instant Games platform in an exciting new attempt to engage its user base. As a result, you can now play a number of different games directly through Facebook Messenger. All of these games run with HTML5, meaning you play... | Read more »
Apollo Justice Ace Attorney (Games)
Apollo Justice Ace Attorney 1.00.00 Device: iOS Universal Category: Games Price: $.99, Version: 1.00.00 (iTunes) Description: Court Is Back In Session Star as rookie defense attorney, Apollo Justice, as he visits crime scenes,... | Read more »

Price Scanner via MacPrices.net

Monday roundup of Holiday Mac sales: Up to $3...
Take up to $300 off MSRP on the price of a new Apple Mac at B&H Photo today as part of their Holiday sale. Shipping is free, and B&H charges NY sales tax only. Touch Bar MacBook Pros are in... Read more
12-inch WiFi Apple iPad Pros on sale for up t...
B&H Photo has 12″ WiFi Apple iPad Pros on sale for up to $50 off MSRP, each including free shipping. B&H charges sales tax in NY only: - 12″ Space Gray 32GB WiFi iPad Pro: $749 $50 off MSRP... Read more
9-inch Apple WiFi iPad Pros on sale for $20-$...
B&H Photo has 9.7″ Apple WiFi iPad Pros on sale for $20-$50 off MSRP, each including free shipping. B&H charges sales tax in NY only: - 9″ Space Gray 256GB WiFi iPad Pro: $779.95 $20 off MSRP... Read more
Holiday sale: Apple MacBook Airs available fo...
B&H Photo has 13″ MacBook Airs on sale for $100 off MSRP. Shipping is free, and B&H charges NY sales tax only: - 13″ 1.6GHz/128GB MacBook Air (MMGF2LL/A): $899 $100 off MSRP - 13″ 1.6GHz/... Read more
13-inch Silver Touch Bar MacBook Pro in stock...
Amazon has the new 2016 13″ 2.9GHz/256GB Silver Touch Bar MacBook Pro (MLVP2LL/A) in stock today and on sale for $1749 including free shipping. That’s $50 off MSRP, and it’s the lowest price... Read more
Parallels Toolbox 1.3 for Mac Offers 25 Singl...
Parallels has launched Parallels Toolbox 1.3 for Mac, an upgrade that adds five new utilities to the stand-alone application which was released in August and is available exclusively online at http... Read more
OWC Mercury Elite Pro Dual mini Ultra-Portabl...
OWC has introduced the new OWC Mercury Elite Pro Dual mini, a powerful yet ultra-portable dual-drive RAID solution. The new Mercury Elite Pro Dual mini packs phenomenal performance into a small... Read more
Clearance 13-inch Retina MacBook Pros availab...
B&H Photo has clearance 2015 13″ Retina Apple MacBook Pros available for up to $200 off original MSRP. Shipping is free, and B&H charges NY tax only: - 13″ 2.7GHz/128GB Retina MacBook Pro: $... Read more
Roundup of 2016 13-inch 2.0GHz MacBook Pro sa...
B&H has the non-Touch Bar 13″ MacBook Pros in stock today for $50-$100 off MSRP. Shipping is free, and B&H charges NY sales tax only: - 13″ 2.0GHz MacBook Pro Space Gray (MLL42LL/A): $1449 $... Read more
New 13-inch 2.0GHz Space Gray MacBook Pro in...
Adorama has the new 13″ 2.0GHz Space Gray MacBook Pro (non-Touch Bar, MLL42LL/A) in stock for $1499 including a free 3-year AppleCare Protection Plan. Shipping is free, and Adorama charges sales tax... Read more

Jobs Board

Lead *Apple* Solutions Consultant - Apple (...
# Lead Apple Solutions Consultant Job Number: 53586123 Pittsburgh, Pennsylvania, United States Posted: Nov. 28, 2016 Weekly Hours: 40.00 **Job Summary** The Lead ASC Read more
*Apple* Retail - Multiple Positions- Plano,...
Job Description: Sales Specialist - Retail Customer Service and Sales Transform Apple Store visitors into loyal Apple customers. When customers enter the store, Read more
*Apple* Retail - Multiple Positions- Kansas...
Job Description:SalesSpecialist - Retail Customer Service and SalesTransform Apple Store visitors into loyal Apple customers. When customers enter the store, Read more
*Apple* Retail - Multiple Positions- Chicago...
Job Description: Sales Specialist - Retail Customer Service and Sales Transform Apple Store visitors into loyal Apple customers. When customers enter the store, Read more
Hardware Design Validation Engineer - *Apple...
The Apple Watch team is looking for a Hardware Design Validation Engineer. This person will be part of the Apple Watch hardware team with responsibilities for Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.