B::Showlex - Show lexical variables used in functions or files

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This is a development version of Perl. </div> <h1><a id="toc">CONTENTS</a></h1> <ul> <li> <a class="text-decoration-none" href="#NAME">NAME</a> </li> <li> <a class="text-decoration-none" href="#SYNOPSIS">SYNOPSIS</a> </li> <li> <a class="text-decoration-none" href="#DESCRIPTION">DESCRIPTION</a> </li> <li> <a class="text-decoration-none" href="#EXAMPLES">EXAMPLES</a> <ul> <li> <a class="text-decoration-none" href="#OPTIONS">OPTIONS</a> </li> </ul> </li> <li> <a class="text-decoration-none" href="#SEE-ALSO">SEE ALSO</a> </li> <li> <a class="text-decoration-none" href="#TODO">TODO</a> </li> <li> <a class="text-decoration-none" href="#AUTHOR">AUTHOR</a> </li> </ul> <h1 id="NAME"><a class="permalink" href="#NAME">#</a>NAME</h1> <p>B::Showlex - Show lexical variables used in functions or files</p> <h1 id="SYNOPSIS"><a class="permalink" href="#SYNOPSIS">#</a>SYNOPSIS</h1> <pre><code class="plaintext">perl -MO=Showlex[,-OPTIONS][,SUBROUTINE] foo.pl</code></pre> <h1 id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">#</a>DESCRIPTION</h1> <p>When a comma-separated list of subroutine names is given as options, Showlex prints the lexical variables used in those subroutines. Otherwise, it prints the file-scope lexicals in the file.</p> <h1 id="EXAMPLES"><a class="permalink" href="#EXAMPLES">#</a>EXAMPLES</h1> <p>Traditional form:</p> <pre><code>$ perl -MO=Showlex -e 'my ($i,$j,$k)=(1,"foo")' Pad of lexical names for comppadlist has 4 entries 0: (0x8caea4) undef 1: (0x9db0fb0) $i 2: (0x9db0f38) $j 3: (0x9db0f50) $k Pad of lexical values for comppadlist has 5 entries 0: SPECIAL #1 &PL_sv_undef 1: NULL (0x9da4234) 2: NULL (0x9db0f2c) 3: NULL (0x9db0f44) 4: NULL (0x9da4264) -e syntax OK</code></pre> <p>New-style form:</p> <pre><code>$ perl -MO=Showlex,-newlex -e 'my ($i,$j,$k)=(1,"foo")' main Pad has 4 entries 0: (0x8caea4) undef 1: (0xa0c4fb8) "$i" = NULL (0xa0b8234) 2: (0xa0c4f40) "$j" = NULL (0xa0c4f34) 3: (0xa0c4f58) "$k" = NULL (0xa0c4f4c) -e syntax OK</code></pre> <p>New form, no specials, outside O framework:</p> <pre><code>$ perl -MB::Showlex -e \ 'my ($i,$j,$k)=(1,"foo"); B::Showlex::compile(-newlex,-nosp)->()' main Pad has 4 entries 1: (0x998ffb0) "$i" = IV (0x9983234) 1 2: (0x998ff68) "$j" = PV (0x998ff5c) "foo" 3: (0x998ff80) "$k" = NULL (0x998ff74)</code></pre> <p>Note that this example shows the values of the lexicals, whereas the other examples did not (as they're compile-time only).</p> <h2 id="OPTIONS"><a class="permalink" href="#OPTIONS">#</a>OPTIONS</h2> <p>The <code>-newlex</code> option produces a more readable <code>name => value</code> format, and is shown in the second example above.</p> <p>The <code>-nosp</code> option eliminates reporting of SPECIALs, such as <code>0: SPECIAL #1 &PL_sv_undef</code> above. Reporting of SPECIALs can sometimes overwhelm your declared lexicals.</p> <h1 id="SEE-ALSO"><a class="permalink" href="#SEE-ALSO">#</a><a id="SEE"></a>SEE ALSO</h1> <p><a href="/5.39.10/B::Showlex">B::Showlex</a> can also be used outside of the O framework, as in the third example. See <a href="/5.39.10/B::Concise">B::Concise</a> for a fuller explanation of reasons.</p> <h1 id="TODO"><a class="permalink" href="#TODO">#</a>TODO</h1> <p>Some of the reported info, such as hex addresses, is not particularly valuable. Other information would be more useful for the typical programmer, such as line-numbers, pad-slot reuses, etc.. Given this, -newlex is not a particularly good flag-name.</p> <h1 id="AUTHOR"><a class="permalink" href="#AUTHOR">#</a>AUTHOR</h1> <p>Malcolm Beattie, <code>mbeattie@sable.ox.ac.uk</code></p> </div> <div id="footer"> <p>Perldoc Browser is maintained by Dan Book (<a href="https://metacpan.org/author/DBOOK">DBOOK</a>). 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Please contact them via the <a href="https://github.com/Perl/perl5/issues">Perl issue tracker</a>, the <a href="https://lists.perl.org/list/perl5-porters.html">mailing list</a>, or <a href="https://kiwiirc.com/client/irc.perl.org/p5p">IRC</a> to report any issues with the contents or format of the documentation.</p> </div> </div> <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.1/jquery.slim.min.js" integrity="sha512-/DXTXr6nQodMUiq+IUJYCt2PPOUjrHJ9wFrqpJ3XkgPNOZVfMok7cRw6CSxyCQxXn6ozlESsSh1/sMCTF1rL/g==" crossorigin="anonymous"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.16.1/umd/popper.min.js" integrity="sha512-ubuT8Z88WxezgSqf3RLuNi5lmjstiJcyezx34yIU2gAHonIi27Na7atqzUZCOoY4CExaoFumzOsFQ2Ch+I/HCw==" crossorigin="anonymous"></script> <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.5.2/js/bootstrap.min.js" integrity="sha384-B4gt1jrGC7Jh4AgTPSdUtOBvfO8shuf57BaghqFfPlYxofvL8/KUEfYiJOMMV+rV" crossorigin="anonymous"></script> <script src="/js/highlight.pack.js"></script> <script>hljs.highlightAll();</script> </body> </html>

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B::Showlex - Show lexical variables used in functions or files - Perldoc Browser