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2021-06-08 00:14:16 +00:00
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<title>Extension Scripts - SourceGen Tutorial</title>
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6502bench
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<ul>
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<li id="sidenav-index"><a href="./">Introduction</a></li>
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<li id="sidenav-about-disasm"><a href="about-disasm.html">About Disassembly</a></li>
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<li id="sidenav-using-sourcegen"><a href="using-sourcegen.html">Using SourceGen</a>
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<li id="sidenav-digging-deeper"><a href="digging-deeper.html">Digging Deeper</a>
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<li id="sidenav-string-formatting"><a href="string-formatting.html">String Formatting</a></li>
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<li id="sidenav-local-variables"><a href="local-variables.html">Local Variables</a></li>
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<li id="sidenav-advanced-topics"><a href="advanced-topics.html">Advanced Topics</a>
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<li id="sidenav-address-tables"><a href="address-tables.html">Address Tables</a></li>
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<li id="sidenav-extension-scripts" class="active"><a href="extension-scripts.html">Extension Scripts</a></li>
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<li id="sidenav-visualizations"><a href="visualizations.html">Visualizations</a></li>
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<li id="sidenav-suggestions"><a href="suggestions.html">Suggestions</a></li>
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<div id="main">
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<h2>Extension Scripts</h2>
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<div class="grid-container">
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<div class="grid-item-text">
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<p>Some repetitive formatting tasks can be handled with automatic scripts.
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This is especially useful for inline data, which can confuse the code
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analyzer.</p>
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<p>An earlier tutorial demonstrated how to manually mark bytes as
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inline data. We're going to do it a faster way. For this tutorial,
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start a new project with the <samp>Generic 6502</samp> profile, and
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in the SourceGen Examples/Tutorial directory select "Tutorial4".</p>
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<!--<p>We'll need to load scripts from the project directory, so we have to
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save the project. <samp>File > Save</samp>,
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use the default name ("Tutorial4.dis65").</p>-->
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</div>
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</div>
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<div class="grid-container">
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<div class="grid-item-image">
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<img src="images/t4-add-inlinel1.png" alt="t4-add-inlinel1"/>
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</div>
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<div class="grid-item-text">
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<p>Take a look at the disassembly listing. The file starts with a
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<code>JSR</code> followed by a string that begins with a small number.
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This appears to be a string with a leading length byte. We want to load
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a script that can handle that, so use
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<samp>Edit > Project Properties</samp>, select the
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<samp>Extension Scripts</samp> tab, and click
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<samp>Add Scripts from Runtime</samp>. The file
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browser opens in the RuntimeData directory. Open the
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"<samp>Common</samp>" folder, select the file
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"<samp>StdInline.cs</samp>", click <samp>Open</samp>,
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then <samp>OK</samp>.</p>
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</div>
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</div>
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<div class="grid-container">
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<div class="grid-item-image">
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<img src="images/t4-stdinline-src.png" alt="t4-stdinline-src"/>
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</div>
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<div class="grid-item-text">
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<p>Nothing happened. If you look at the script with an editor (and you
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know some C#), you'll see that it's looking for a <code>JSR</code> to a
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function that begins with certain prefixes. For ASCII length-delimited
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strings, the prefix is <code>InA1_</code>. So let's set a label.</p>
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</div>
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</div>
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<div class="grid-container">
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<div class="grid-item-text">
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<p>Double-click the <code>JSR</code> opcode on line $1000
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to jump to address $1036. The only thing there is an <code>RTS</code>.
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It's supposed to be a routine that prints a string with a leading length
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byte, but for the sake of keeping the example code short it's just a
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place-holder. Use the curly toolbar arrow
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(or <kbd class="key">Alt+LeftArrow</kbd>) to jump back to $1000.</p>
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</div>
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</div>
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<div class="grid-container">
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<div class="grid-item-image">
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<img src="images/t4-inlinel1-edit.png" alt="t4-inlinel1-edit"/>
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</div>
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<div class="grid-item-text">
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<p>This time, double-click the <code>JSR</code> <i>operand</i>
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("<samp>L1036</samp>") to edit the operand.
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Click <samp>Create Label</samp>, and enter <kbd>InA1_PrintString</kbd>.
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Remember that labels are case-sensitive;
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you must enter it exactly as shown. Hit <samp>OK</samp> to accept the label,
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and <samp>OK</samp> to close the operand editor.</p>
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</div>
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</div>
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<div class="grid-container">
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<div class="grid-item-image">
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<img src="images/t4-inlinel1-done.png" alt="t4-inlinel1-done"/>
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</div>
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<div class="grid-item-text">
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<p>If all went well, address $1003
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should now be an L1 string "<code>How long?</code>", and address $100D
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should be another <code>JSR</code>. This one appears to be followed
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by an inline null-terminated string, so we'll need something
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that handles that.</p>
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</div>
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</div>
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<div class="grid-container">
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<div class="grid-item-image">
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<img src="images/t4-inlinenull-done.png" alt="t4-inlinenull-done"/>
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</div>
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<div class="grid-item-text">
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<p>Double-click the operand on line $100D ("<code>L1037</code>"),
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click <samp>Create Label</samp>,
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and set the label to "<kbd>InAZ_PrintString1</kbd>".
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Hit <samp>OK</samp> twice. That formatted the first one and got us
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to the next <code>JSR</code>, at $1019. Repeat the process on line $1019
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("<code>L1038</code>"), setting the label to
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"<kbd>InAZ_PrintString2</kbd>".</p>
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</div>
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</div>
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<div class="grid-container">
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<div class="grid-item-image">
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<img src="images/t4-inlinemulti-done.png" alt="t4-inlinemulti-done"/>
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</div>
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<div class="grid-item-text">
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<p>The last <code>JSR</code>, at $1025, is followed by a 16-bit
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pointer. Edit the operand, and use <samp>Create Label</samp> to
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set the label at the target address to "<kbd>InWA_StringPtr</kbd>".
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Because the bytes were formatted as an address and not a just a
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16-bit value, a label was generated automatically.</p>
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<p>What we'd really like to do in this case is to have it format the
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16-bit address as a pointer, and format the data it points to as
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a null-terminated string. The StdInline script doesn't know how to
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do that though, so you'd need to write a custom script. (Scripts
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can format multiple data items, add symbolic references to labels
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and constants, and chase pointers around.)</p>
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<p>The entire project is now nicely formatted. In a real project the
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"Print Inline" locations would be actual print functions, not just <code>RTS</code>
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instructions. There would likely be multiple <code>JSR</code>s to the print function,
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so labeling a single function entry point could format dozens of inline
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strings and clean up the disassembly automatically. The reason for
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allowing wildcard names is that some functions may have multiple
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entry points or chain through different locations.</p>
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</div>
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</div>
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2021-11-14 17:02:53 +00:00
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<div class="grid-container">
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<div class="grid-item-text">
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<p>Extension scripts can make your life much easier, but they do require
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some programming experience. See the "Advanced Topics" section in the
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SourceGen manual for more details.</p>
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</div>
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</div>
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</div> <!-- #main -->
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