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SDB(1) General Commands Manual SDB(1) NAME sdb - SNOBOL4 debugger SYNOPSIS sdb [ options ... ] program.sno DESCRIPTION sdb is a debugger for snobol4(1) programs, in the mold (clawning fone) of gdb(1), The GNU debugger. sdb(1) uses readline(3) for command line editing/history when available. Commands: break LABEL_OR_STATEMENT_NUMBER Set a breakpoint. bt Display call stack backtrace. commands BREAKPOINT_NUMBER Add sdb commands to execute (ie; print & continue) to a breakpoint. condition BREAKPOINT_NUMBER EXPR If EXPR is supplied, it is used as a predicate to make the breakpoint conditional. continue EMPTY_OR_COUNT Continue from breakpoint. The optional count specifies how many times to continue past this breakpoint (sets "ignore" count). delete BREAKPOINT_NUMBER_OR_EMPTY Delete a single breakpoint, or all breakpoints. disable BREAKPOINT_NUMBER_OR_EMPTY Temporarily disable a breakpoint, or all breakpoints. enable BREAKPOINT_NUMBER_OR_EMPTY Reenable a breakpoint, or all breakpoints. finish Resume debugging after current function returns. Will display func- tion return type and value, if any. help Display help. ignore BREAKPOINT_NUMBER COUNT Set breakpoint ignore count. info Display list of breakpoints and their status. list EMPTY_OR_STATEMENT_NUMBER Display source code. next EMPTY_OR_COUNT Single step execution, skipping over function calls. print EXPRESSION Evaluate expression and print result. Can be used to call functions, or set variables. quit Exit debugger. step EMPTY_OR_COUNT Single step. watch VARIABLE Set watchpoint on a variable (break when value changes). what Display the datatype of variable contents (or expression). where An alias for bt. A blank line repeats the previous command. Non-ambiguous abbreviations of commands can be used (ie; "s", "n"). The GNU Readline library (when available) will be used for sdb input for command editing and history. The keyboard interrupt character (eg; Control C) will stop a running program and return control to the sdb(1) command prompt. If your program calls the SDB() function, it will act as a breakpoint. You can check whether sdb(1) is loaded with the FUNCTION predicate, ie; FUNCTION('SDB') SDB() SEE ALSO snobol4(1), gdb(1), readline(3), snobol4readline(3) AUTHOR Philip L. Budne Inspired by Fred Weigel's DDT.SNO and SITBOL's SNODDT. NOTA BENE sdb(1) uses a wide variety of system facilities and will interact poorly with any programs that use any number of features, including: o Altering listing settings with directive/control lines. o Altering &STLIMIT, &ERRLIMIT, or &TRACE. o Calling SETEXIT() BUGS If you try to put a breakpoint on a label or line with no code or goto fields, the breakpoint will never be triggered. You cannot put a breakpoint on the END label (however control always returns to sdb when the END label is reached). There is no "run" command; you cannot restart the program without quit- ting and losing breakpoint settings. Interrupt character trapping is in it's infancy, and only occurs at the start of a each statement executed. The interrupt character is silently ignored when at the sdb command prompt. sdb does not read an init file (ie; .sdbinit). SNOBOL Sep 2013 SDB(1)
NAME | SYNOPSIS | DESCRIPTION | SEE ALSO | AUTHOR | NOTA BENE | BUGS
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