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3.9.3 Source code debugger

The source code debugger (sdb) is an experimental feature, its interface may change in future versions of .
To enable the use of the source code debugger has to be started with the option -d or --sdb (see Command line options).

sdb commands

Each sdb command consists of one character which may be followed by a parameter.
b
print backtrace of calling stack
c
continue
e
edit the current procedure and reload it (current call will be aborted)
only available on UNIX systems
h,?
display help screen
n
execute current line, sdb break at next line
p <identifier>
display type and value of the variable given by <identifier>
Q
quit this session
q <flags>
quit debugger, set debugger flags(0,1,2)
0: continue, disable the debugger
1: continue
2: throw an error, return to toplevel

Syntactical errors in procedures

If was started using the command line option -d or --sdb, a syntactical error in a procedure will start the source code debugger instead of returning to the top level with an error message. The commands q 1 and q 2 are equivalent in this case.

SDB breakpoints in procedures

Up to seven SDB breakpoints can be set. To set a breakpoint at a procedure use breakpoint. (See breakpoint).
These breakpoints can be cleared with the command d breakpoint_no from within the debugger or with breakpoint( proc_name ,-1);.


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