Resources -- Compilers

Free Development Systems

GW-Ada/Ed for DOS

Ada 83 Program Development Environment for DOS

GW-Ada/Ed for DOS (mirror) supports a full-language Ada 83 compiler, which produces virtual code for execution by a virtual-machine simulator (interpreter) included in the distribution. The compiler was validated by the U.S. government several years ago, using ACVC version 1.7 (the current version is 1.11); 1.7 validation means that this compiler is quite complete and accurate. If you are doing small computations and efficiency is not a primary concern, this compiler is very attractive.
January 1994 information, written by
	Prof. Michael B. Feldman 
	Department of Electrical Engineering and Computer Science 
	The George Washington University Washington, DC 20052 
	(202) 994-5253 (voice) 
	(202) 994-5296 (fax) (Internet)
This project was sponsored by The George Washington University, and in part by the United States Advanced Research Projects Agency (ARPA) under contract #FY3592-93-10234, administered by Phillips Laboratory, Kirtland AFB, NM 87117-5776.

This distribution contains the executables for GWAda, which consists of the NYU Ada/Ed translator/interpreter system for DOS, together with an integrated editor developed by Prof. Arthur Vargas Lopes of the Pontifical University at Porto Alegre, Brazil. Lopes began his work on GWAda while he was a doctoral student at The George Washington University. There is also a very nice extended runtime facility, with interesting kinds of source tracing. The runtime was developed by Charles Kann, a doctoral student at GW.

GWAda is being freely distributed at no charge. In the near future we will make the source code available under the GNU General Public License. Please understand that we are not yet providing source code because this system is still in the developmental stage and we wish to avoid horrible version-proliferation complications. Source code for Ada/Ed itself is available from NYU and from WUARCHIVE.

You may in any case distribute this software as you see fit, for educational purposes and not for profit. Include this document if you redistribute the software, and give full credit to its originators.

GWAda is distributed as two .zip archives created by info-zip, which is included in the distribution. Each archive will fit on a 1.44 mb high-density 3.5" diskette.

When you un-archive the files (see the instructions below), you will find a user manual, userman.doc, describing the GW development environment, and a file readme.nyu file with documentation on the NYU part of the system. Note that you do not have to use the GWAda integrated environment, but can execute the various parts of NYU Ada/Ed from the DOS command line, as described in the NYU instructions.

System Requirements

Additional Libraries

We are providing a few additional libraries for you to work with. One is a set of interesting demos developed at GWU; another is John Dalbey's Spider Graphics; still other is an adaptation of the Portable Ada Math Library. These are set up in separate subdirectories. A fourth subdirectory contains a lot of interesting Ada programs supplied by NYU as part of their distribution.

Help with the Ada Language Reference Manual

Part of the GWAda environment is a help system that assists in searching the Ada Language Reference Manual. This hypertext-like navigational aid is accessed from the Help menu in GWAda.

Templates in the Editor

We are experimenting with "templates" in the editor. Try selecting options from the "Ada" menu. Some of the templates are very straightforward control structures; others are "higher-level" structures. You can change the contents of the templates.

Package Completion

The package is a very important structure in Ada. To help you create packages easily, we have included in the editor a facility that will automatically create the skeleton of a package body once you have constructed and compiled the specification. See the user manual for further details.

Runtime Monitoring

This system incorporates some innovative facilities for letting you observe the behavior of your program as it executes. When you start executing a program, a window opens to show you its source code, and scrolls the code, line-by-line, during execution. You can also "single- step" through the code; pressing the space bar advances the execution one more line. In addition, if your program calls a subprogram, a window opens for the subprogram, overlapping the calling program's window. Finally, you can control the execution speed of your program with a "speed control."

If your program contains multiple Ada tasks, the runtime monitor will let you follow the execution of the various tasks as they are "time- shared". You can open up to four windows to show task source code. See the user manual for further details.

This program is distributed free of charge for educational purposes, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Page last modified: 1996-10-02