| 1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980 |
- <?xml version="1.0" encoding="UTF-8" standalone="no"?>
- <!DOCTYPE html><html xmlns="http://www.w3.org/1999/xhtml" xmlns:epub="http://www.idpf.org/2007/ops" xmlns:m="http://www.w3.org/1998/Math/MathML" xmlns:pls="http://www.w3.org/2005/01/pronunciation-lexicon" xmlns:ssml="http://www.w3.org/2001/10/synthesis" xmlns:svg="http://www.w3.org/2000/svg">
- <head>
- <title>Debugging</title>
- <link rel="stylesheet" type="text/css" href="docbook-epub.css"/>
- <link rel="stylesheet" type="text/css" href="kawa.css"/>
- <script src="kawa-ebook.js" type="text/javascript"/>
- <meta name="generator" content="DocBook XSL-NS Stylesheets V1.79.1"/>
- <link rel="prev" href="Parameter-objects.xhtml" title="Parameter objects"/>
- <link rel="next" href="Input-Output.xhtml" title="Input, output, and file handling"/>
- </head>
- <body>
- <header/>
- <section class="chapter" title="Debugging" epub:type="chapter" id="Debugging">
- <div class="titlepage">
- <div>
- <div>
- <h2 class="title">Debugging</h2>
- </div>
- </div>
- </div>
- <p class="synopsis" kind="Syntax"><span class="kind">Syntax</span><span class="ignore">: </span><a id="idm139667873060208" class="indexterm"/> <code class="function">trace</code> <em class="replaceable"><code>procedure</code></em></p>
- <div class="blockquote">
- <blockquote class="blockquote">
- <p>Cause <em class="replaceable"><code>procedure</code></em> to be "traced", that is debugging output will
- be written to the standard error port every time <em class="replaceable"><code>procedure</code></em>
- is called, with the parameters and return value.
- </p>
- <p>Note that Kawa will normally assume that a procedure defined with
- the procedure-defining variant of <code class="literal">define</code> is constant,
- and so it might be inlined:
- </p>
- <pre class="screen">(define (ff x) (list x x))
- (trace ff) ;; probably won't work
- (ff 3) ;; not traced
- </pre>
- <p>It works if you specify the <code class="literal">--no-inline</code> flag to Kawa.
- Alternatively, you can use the variable-defining variant of <code class="literal">define</code>:
- </p>
- <pre class="screen">#|kawa:1|# (define ff (lambda (x) name: 'ff (list x x)))
- #|kawa:2|# (trace ff) ;; works
- #|kawa:3|# (ff 3)
- call to ff (3)
- return from ff => (3 3)
- (3 3)
- </pre>
- <p>Note the use of the <code class="literal">name:</code> procedure property to give the
- anonymous <code class="literal">lambda</code> a name.
- </p>
- </blockquote>
- </div>
- <p class="synopsis" kind="Syntax"><span class="kind">Syntax</span><span class="ignore">: </span><a id="idm139667873051408" class="indexterm"/> <code class="function">untrace</code> <em class="replaceable"><code>procedure</code></em></p>
- <div class="blockquote">
- <blockquote class="blockquote">
- <p>Turn off tracing (debugging output) of <em class="replaceable"><code>procedure</code></em>.
- </p>
- </blockquote>
- </div>
- <p class="synopsis" kind="Procedure"><span class="kind">Procedure</span><span class="ignore">: </span><a id="idm139667873047600" class="indexterm"/> <code class="function">disassemble</code> <em class="replaceable"><code>procedure</code></em></p>
- <div class="blockquote">
- <blockquote class="blockquote">
- <p>Returns a string representation of the disassembled bytecode
- for <em class="replaceable"><code>procedure</code></em>, when known.
- </p>
- </blockquote>
- </div>
- </section>
- <footer>
- <div class="navfooter">
- <p>
- Up: <a accesskey="u" href="pt01.xhtml">Part . Reference Documentation</a></p>
- <p>
- Previous: <a accesskey="p" href="Eval-and-Environments.xhtml">Eval and Environments</a></p>
- <p>
- Next: <a accesskey="n" href="Input-Output.xhtml">Input, output, and file handling</a></p>
- </div>
- </footer>
- </body>
- </html>
|
