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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 SINGULAR.
To enable the
use of the source code debugger SINGULAR 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 SINGULAR 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 SINGULAR 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 usebreakpoint. (See breakpoint).
These breakpoints can be cleared with the command
d breakpoint_no
from within the debugger or with
breakpoint( proc_name ,-1);.