MATLAB REAL-TIME WORKSHOP 7 - TARGET LANGUAGE COMPILER Manuale Utente Scaricare il pdf (Pagina 148)

3 Creating Fortran MEX-Files

3-38

Debugging Fortran Language MEX-Files

On most platforms, it is now possible to debug MEX-files while they are

running within MATLAB. Complete source code debugging, including setting

breakpoints, examining variables, and stepping through the source code

line-by-line, is now available.

Note The section on “Troubleshooting” on page 1-32 provides additional

information on isolating problems with MEX-files.

To debug a MEX-file from within MATLAB, you must first compile the

MEX-file with the

-g option to mex.

mex -g filename.f

Debugging on UNIX

You must start MATLAB from within a debugger. To do this, specify the name

of the debugger you want to use with the

-D option when starting MATLAB.

For example, to use

dbx, the UNIX debugger, type

matlab -Ddbx

Once the debugger loads MATLAB into memory, you can start it by issuing a

run command. Now, from within MATLAB, enable MEX-file debugging by

typing

dbmex on

at the MATLAB prompt. Then run the MEX-file you want to debug as you

would ordinarily (either directly or by means of some other function or script).

Before executing the MEX-file, you will be returned to the debugger.

You may need to tell the debugger where the MEX-file was loaded or the name

of the MEX-file, in which case MATLAB will display the appropriate command

for you to use. At this point, you are ready to start debugging. You can list the

source code for your MEX-file and set break points in it. It is often convenient

to set one at

mexFunction so that you stop at the beginning of the gateway

routine.

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MATLAB REAL-TIME WORKSHOP 7 - TARGET LANGUAGE COMPILER Manuale Utente Pagina 148