Download E-books Pro Perl Debugging PDF

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By Andy Lester, Richard Foley

Combining the easiest good points of C, UNIX utilities, and ordinary expressions, Perl has grown as probably the most strong and renowned scripting languages. the precious Perl is frequently used for approach management, textual content processing and internet programming. it really is even getting used for extra unique components, like bioinformatics. Perl is supported by way of all the such a lot admired working structures, together with home windows, Unix, OS/2, Amiga, and others.

Pro Perl Debugging steps in to aid get to the bottom of the hindrance of program checking out and debugging—one of the largest time commitments in a programmers day-by-day regimen. What this e-book will do is rescue you from substandard program checking out practices. The publication commences with a number of chapters that evaluation the debuggers uncomplicated positive aspects, then covers universal debugging situations. The concluding component examines debugger customization, replacement debugging utilities, and debugging top practices.
<h3>Table of Contents</h3><ol> * advent
* examining Variables and Getting aid
* Controlling software Execution
* Debugging an easy Command Line software
* Tracing Execution
* Debugging Modules
* Debugging Object-Oriented Perl
* utilizing the Debugger As a Shell
* Debugging a CGI software
* Perl Threads and Forked techniques
* Debugging common Expressions
* Debugger Customization
* Optimization and function tricks and advice
* Command Line and GUI Debuggers
* complete Command Reference
* ebook References and URLs

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Thirteen sub noargs { 14: print __FILE__. " working noargs()\n"; 15: go back (scalar(@_) == zero ? 1 : 0); sixteen } DB<3> Now we wish to set a breakpoint at the noargs subroutine. observe that even if noargs could have given us an analogous effects by itself, since it has been exported to our namespace already, it's continuously a good suggestion to explicitly kingdom which package deal your subroutine belongs to: DB<3> b NoArg::noargs DB<4> As you will see, the debugger doesn’t even ensure it has performed whatever, yet we will use the L command to view an inventory of presently set breakpoints, activities, and watch-expressions. Let’s use L to ensure even if our command has truly been performed competently: DB<4> L NoArg. pm: 14: holiday if (1) DB<4> print __FILE__. " working noargs()\n"; 87 88 bankruptcy 6 ■ DEBUGGING MODULES We don’t have any activities or watch-variables, so all we see is the affirmation that our breakpoint has been set. we would additionally use the L b type of this command, if we're in basic terms drawn to breakpoints at this element, since it might basically reveal the breakpoints which are at the moment set: DB<4> L b NoArg. pm: 14: holiday if (1) DB<5> print __FILE__. " working noargs()\n"; Now we use c to proceed until eventually attaining our breakpoint: DB<5> c usereq loaded NoArg::noargs(NoArg. pm:14): DB<5> print __FILE__. " working noargs()\n"; We seem to have stopped on the first line of the subroutine, and we will be able to cost this via soliciting for a one-time hint utilizing T: DB<5> T $ = NoArg::noargs() referred to as from dossier 'usereq' line 10 DB<5> occasionally it is only a good suggestion to be specific, and to invite for the hint to verify what we think to be right. From the hint we will see that we came through usereq from line 10. getting back from the Subroutine Let’s use r to come from this subroutine to our calling context, as defined in bankruptcy three: DB<5> r NoArg. pm working noargs() scalar context go back from NoArg::noargs: 1 main::(usereq:11): print __FILE__. " has no arguments\n"; DB<5> okay, we’re again in usereq, and it’s a great time to go searching. We’ll use l at our present place to work out the code that would be achieved subsequent, and to reorient ourselves. DB<5> l 11==> 12 thirteen: 14: 15: sixteen 17 18: 19 20 DB<5> print __FILE__. " has no arguments\n"; } else { require Args; my $o_args = Args->new; print __FILE__. " arguments: ". $o_args->format('all'); } go out; start { CHAPTER 6 ■ DEBUGGING MODULES we will see that the Args module will be referred to as within the different department. this system has a few arguments during this different department, and we would are looking to see the subroutines which are to be had in that package deal. atmosphere a Breakpoint in one other Module At this aspect, lets attempt to set up a breakpoint on one of many subroutines within the Args module, format() subroutine: DB<5> b Args::format Subroutine Args::format now not came across. DB<6> Hmmm, that didn’t work—the debugger hasn’t came across the subroutine. We can have misspelled the identify, and a brief option to payment will be to appear for any subroutine within the Args package deal. we'd use a command like this: DB<6> S Args DB<7> nonetheless not anything!

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