TweetFollow Us on Twitter

LS FORTRAN 3.0, Pt 1
Volume Number:8
Issue Number:1
Column Tag:Jörg's Folder

Language Systems FORTRAN 3.0

By Jörg Langowski, MacTutor Regular Contributing Author; Neil Ticktin, Editor, MacTutor Magazine

Note: Source code files accompanying article are located on MacTech CD-ROM or source code disks.

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 like C++ :->).

Next time, some C++ again.

Listing 1
c
cMAIN
c
cPart of an AppleEvents example in the 
cFORTRAN manual.
c
cInvokes program Transform and passes it an 
carray for processing.
c
cCompile this demo with -bkg=4.
c
 PROGRAM MAIN
 REAL*4 Pressure(50)
 INTEGER*4NumPts/50/
 INTEGER*2ERROR,F_SendEvent
 LOGICAL*4F_OpenDocWaiting
 EXTERNAL F_SendEvent,F_OpenDocWaiting
 
 ! initialize an array
 DO J = 1,NumPts
 Pressure(J) = J
 END DO
 
 ! open TRANSFORM
 ERROR = F_SendEvent(‘oapp’,’TRANSFORM’,’’)
 IF (ERROR <> 0) CALL AlertBox(‘AppleEvent Error reported!’)
 
 ! send the data as binary file
 OPEN(10,FILE=’Main.Data’,form=’unformatted’)
 WRITE(10) NumPts,Pressure
 CLOSE(10)
 ERROR = F_SendEvent(‘odoc’,’TRANSFORM’,’Main.Data’)
 IF (ERROR <> 0) 
 1 CALL AlertBox(‘AppleEvent Error reported!’)
 
 ! wait for the data to return
 DO WHILE (.TRUE.)
 IF (F_OpenDocWaiting()) LEAVE
 END DO

 ! close TRANSFORM
 ERROR = F_SendEvent(‘quit’,’TRANSFORM’,’’)
 IF (ERROR <> 0) 
 1 CALL AlertBox(‘AppleEvent Error reported!’)
 
 ! print the data
 OPEN(10,FILE=*,form=’unformatted’)
 READ(10) NumPts,Pressure
 CLOSE(10,status=’delete’)
 WRITE(*,100) (Pressure(i),i=1,NumPts)
100FORMAT(5(x,f10.4)/)
 END

c
cTRANSFORM
c
cPart of an AppleEvents example in the FORTRAN manual.
c
cIs called by MAIN, processes an array and returns it.
c
cCompile this demo with -bkg=4.
c
 PROGRAM TRANSFORM ! a utility program to be
 REAL*4 DataSet(500) ! called by many other processes
 INTEGER*4NumPts
 INTEGER*2ERROR,F_SendEvent
 LOGICAL*4F_OpenDocWaiting
 EXTERNAL F_SendEvent,F_OpenDocWaiting

 ! loop until quit event comes
 DO WHILE (.TRUE.)
 IF (F_OpenDocWaiting()) THEN
 
 ! read in data
 OPEN(10,FILE=*,form=’unformatted’)
 READ(10) NumPts,(DataSet(J),J=1,NumPts)
 CLOSE(10,status=’delete’)
 
 ! transform it
 DO J = 1,NumPts
 DataSet(J) = DataSet(J) * 2.0
 END DO
 
 ! send the data back
 OPEN(10,FILE=’Transform.out’,form=’unformatted’)
 WRITE(10) NumPts,(DataSet(J),J=1,NumPts)
 CLOSE(10)
 ERROR =
 1  F_SendEvent(‘odoc’,’*sender’,’Transform.out’)
 IF (ERROR <> 0) 
 1 CALL AlertBox(‘AppleEvent Error reported!’)
 ELSE
 ! do nothing
 END IF
 END DO
 END

c
cSendScript
c
cSends a script to HyperCard 2.1 via the ‘dosc’ event.
c
cHyperCard v2.1 must be currently executing
c befor running this demo.
c
cCompile this demo with -bkg=4.
c
 program SendScript

 integer*2 err, F_SendScript
 external F_SendScript
 character*20  ch(3)
 character*5ch5
 
 ch(1) = ‘beep’
 ch(2) = ‘hide card window’
 ch(3) = ‘show card window’

 err = F_SendScript(‘HyperCard’,ch,3)
 
 if (err <> 0) then
 write(ch5,’(i5)’) err
 call alertbox
 1 (‘Error ‘//ch5//’ occurred during SendScript.’)
 write(*,*) 
 1 ‘Error ‘//ch5//’ occurred during SendScript.’
 end if
 end
 

Community Search:
MacTech Search:

Software Updates via MacUpdate

Latest Forum Discussions

See All

Osseous has a bone to pick with you as t...
We recently quelled the immense threat brought about by Zemouregal and the giant dragon Vorkath in Runescape, and you might think that earnt adventurers a little break, but no. Instead, Jagex has decided it is time to face off against an equally... | Read more »
Seven Deadly Sins: Idle Adventure opens...
Netmarble has announced the opening of pre-registration for the upcoming idle RPG; The Seven Deadly Sins: IDLE Adventure. Expanding their suite or games for this IP after turn-based RPG Grand Cross, you can soon enjoy the adventures of Meliodas... | Read more »
Tower of God: New World goes all Agatha...
I love me a good mystery, stick Poirot or Colombo on the TV and I am a happy man, and yes I know Colombo is not your traditional sleuth setup, but I adore it. Tower of God: New World is taking a leaf from the whodunits in its latest campaign;... | Read more »
Monster Hunter Now introduces Driftsmelt...
One of the most fun parts of the Monster Hunter franchise, to me at least, is designing that perfect armour set to give you that optimal skill set you’ve been dreaming of. Unfortunately, you sometimes had to sacrifice fashion, but that won’t be a... | Read more »
A sorely overdue feature finally gets ad...
It’s a yo ho ho and the pirate's life and what have you, as Uncharted Waters Origin unveils its May update. This month we have the customary new mates including the historic Gentleman Pirate, a new entry to the Relationship Chronicle, and the... | Read more »
Brawl Stars veteran-backed Octopo Studio...
The 2024 PlayX4 B2B is kicking off tomorrow in Ilsan, lasting until the 26th in KINTEX Hall 1, and Octopo Studio has announced that they will be making an appearance. Shooting RPG Bounty Pang will be on show as the developers seek publishing... | Read more »
The Astral Express sets off to bring Hon...
After vanquishing yet another threat and adding a fine hat to their wardrobe, you’d think the crew of the Astral Express would be able to kick back after their adventures in Penacony. Clearly not though, as HoYo has announced the next leg of the... | Read more »
Dragons rein supreme in Pokemon Unite as...
If you were looking for the strongest type in Pokemon and asked the fanbase, I would wager most people's thoughts would turn to Dragon. They hit hard, are often powerful, and get used by some of the toughest trainers. Pokemon Unite is honouring... | Read more »
Players can take a peek into the design...
It doesn’t matter how much effort developers put into their classes, or how many special little mechanics there are; if there is one that wields two blades, I’m ignoring everything else. Diablo Immortal recently announced such a class in the shape... | Read more »
Android users have a new option in the c...
When you are in the thick of a firefight or trying to pull off a mid-combat parkour flip through a squad of foes, sometimes touchscreen control just won’t do it for you. For those intense sessions, you could benefit from a good mobile controller,... | Read more »

Price Scanner via MacPrices.net

16-inch M3 Pro and M3 Max MacBook Pros on sal...
Amazon is offering a $200-$350 instant discount on 16″ M3 Pro and 16″ M3 Max MacBook Pros this week. Shipping is free: – 16″ M3 Pro MacBook Pros (18GB/512GB) Black: $2249.99, $250 off MSRP – 16″ M3... Read more
Apple WiFi iPads on sale for $50 off MSRP, pr...
Amazon has Apple’s 10th-generation WiFi iPads on sale for $50 off MSRP, starting at only $299. With the discount, Amazon’s prices are the lowest we’ve ever seen for these iPads: – 10″ 10th-generation... Read more
Amazon is offering the lowest prices we’ve se...
Amazon is now offering a $150-$200 discount on every configuration and color of Apple’s M3-powered 15″ MacBook Airs. Prices start at $1149 for models with 8GB of RAM and 256GB of storage: – 15″ M3... Read more
Apple is offering huge discounts on 16-inch M...
Apple has a full line of 16″ M3 Pro and M3 Max MacBook Pros available, Certified Refurbished, starting at $2119 and ranging up to $600 off MSRP. Each model features a new outer case, shipping is free... Read more
Memorial Day Sale: Apple’s 24-inch M3 iMacs f...
Amazon is offering a $150 discount on Apple’s new M3-powered 24″ iMacs as part of their Memorial Day Sales. Prices start at $1149 for models with 8GB of RAM and 256GB of storage: – 24″ M3 iMac/8-core... Read more
Memorial Day Savings: 16-inch MacBook Pros on...
Apple 16″ MacBook Pros with M3 Pro and M3 Max CPUs are in stock and on Memorial Day Weekend sale for $200-$300 off MSRP at B&H Photo. Their prices are among the lowest currently available for... Read more
Amazon has 14-inch M3 MacBook Pros on sale fo...
Amazon has 14-inch M3 MacBook Pros in stock and on sale for $150-$200 off MSRP as part of their Memorial Day Weekend sales. Shipping is free. Note that Amazon’s stock tends to come and go: – 14″ M3... Read more
Apple retailers offer MacBook Airs starting a...
Our Apple award-winning MacBook Air Price Trackers are continually updated with the latest information on prices, bundles, and availability for 13″ M3, M2, and M1 MacBook Airs and 15″ M3 and M2... Read more
Apple now selling iPhone 14 models starting a...
Apple has unlocked Certified Refurbished iPhone 14 models in stock starting at $619 and ranging up to $230 off original MSRP. Apple includes a standard one-year warranty and new outer shell with... Read more
Memorial Day Weekend Sale: Apple AirPods Max...
Apple retailers have AirPods Max headphones on sale for $100 off MSRP as part of their Memorial Day Weekend sales. The sale price is valid for all colors at the time of this post. Shipping is free... Read more

Jobs Board

Principal Systems Engineer - *Apple* System...
**28833BR** **Position Title:** Principal Systems Engineer - Apple Systems Engineering **Department:** Publix Technology **Location:** Lakeland, FL **Description:** Read more
*Apple* App Developer - Datrose (United Stat...
…year experiencein programming and have computer knowledge with SWIFT. Job Responsibilites: Apple App Developer is expected to support essential tasks for the RxASL Read more
Nursing Assistant - *Apple* Hill Surgical C...
Nursing Assistant - Apple Hill Surgical Center - Post Anesthesia Care Unit - Day Location: WellSpan Health, York, PA Schedule: Full Time Sign-On Bonus Eligible Read more
LPN-Physician Office Nurse - Orthopedics- *Ap...
LPN-Physician Office Nurse - Orthopedics- Apple Hill Location: WellSpan Medical Group, York, PA Schedule: Full Time Sign-On Bonus Eligible Remote/Hybrid Regular Apply Read more
DMR Technician - *Apple* /iOS Systems - Haml...
…relevant point-of-need technology self-help aids are available as appropriate. ** Apple Systems Administration** **:** Develops solutions for supporting, deploying, Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.