Normally, the command lines of a MIDAS procedure are not displayed on the
terminal. To control the display of the lines of a MIDAS procedure, use the
command ECHO.
With ECHO/ON the lines of a MIDAS procedure are displayed on the
terminal as they are read from the file and executed. This way,
it is possible to get an impression of how much time various parts of
a procedure need.
With ECHO/FULL the lines are displayed as they are read and if symbols
have to be substituted, the lines are again displayed after substitution.
To avoid echoing and return to a silent mode, enter ECHO/OFF.
The ECHO command has as parameter the procedure-level-interval
where it should be applicable. Thus you can, e.g., display only the lines
of a MIDAS procedure executing at level 2, etc.
Echoing each command line of a MIDAS procedure will identify most of the
syntax and other obvious errors. However, this may not be sufficient for long
and complicated procedures.
For these cases use the Midas Command Language Debugger:
DEBUG/PROCEDURE levla,levlb ON/OFF !en/disable procedure debugging
DEBUG/MODULE levla,levlb ON/OFF !en/disable module (F 77, C)
debugging
SHOW/CODE comnd/qualif !display the code of related procedure
Once procedure debugging is switched on, e.g., via DEBUG/PROC 1,3 ON,
all MIDAS procedures executing at level 1, 2 or 3
start up in stepwise debugging mode. The prompt changes to
Mdb and each command line
is displayed on the terminal, and only executed when you hit
.
Furthermore, a set of basic debugging commands may be executed, e.g. listing
the preprocessed procedure code, setting and clearing break points, and
switching from stepwise to continuous mode.
Also the keywords may be inspected at any moment. This is an important tool
because local keywords cannot be checked otherwise; once the procedure
terminates, all local keywords disappear.
If you want to execute any other command, enter PAUSE to interrupt the
procedure you're debugging, execute any other command you want, and
enter CONTINUE to continue debugging the procedure.
When you are in the debugger
(indicated via the Mdb prompt), use the command `h' (for HELP) to
display all the available debug commands.
To switch the debugging mode for procedures off, use DEBUG/PROC 1,3 off.
If you must debug your application program,
first compile and link that program with the debugger of your host
system.
Make sure, that this is the same debugger as the one stored in a system
keyword of MIDAS (via the command SET/MIDAS_SYSTEM debug=...).
Enter the command DEBUG/MODULE to switch on the debugging
mode for applications.
Subsequently, your application (as well as all other programs activated via the
MIDAS RUN command) will be started with the debugger of your system and
you can debug it in the usual way.
NoteTyping $dbx myprog.exe (e.g. on a SUN) would also start up program myprog.exe in debug mode. But that would not tie the application into the MIDAS environment, i.e. the keywords would not be set correctly.
NoteFor a detailed description of the integration of user applications into MIDAS as well as complete examples (in FORTRAN and C) see the MIDAS Environment Document.