BreakpointsBreakpoints mk Tue, 03/30/2010 - 12:14
A powerful mechanism for debugging a program is to set breakpoints during the debugging session. The breakpoints are designated by a target variable name, a [module.]function name, or a MAL line number (#<number>).
The snippet below illustrates the reaction to set a break point on assignment to variable 'i'.
mal>mdb.start(); #end main; mdb> mal>user.test(1); # user.test(1); mdb>break i breakpoint on 'i' not set mdb>n # io.print(i); mdb>break i mdb>c [ 1 ] # i := calc.*(i,2); mdb>
The breakpoints remain in effect over multiple function calls. They can be removed with the delete statement. A list of all remaining breakpoints is obtained with breakpoints.
The interpreter can be instructed to call the debugger as soon as an exception is raised. Simply add the instruction mdb.setCatch(true).