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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<li id="sidenav-index"><a href="./">Introduction</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 Project</samp>. The file
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browser opens in the project directory. Select the file
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"InlineL1String.cs", click <samp>Open</samp>, 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-inlinel1-src.png" alt="t4-inlinel1-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 called <code>PrintInlineL1String</code>. So let's give it one.</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 $1026. 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 $1026.</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>L1026</samp>") to edit the operand.
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Click <samp>Create Label</samp>, and enter <kbd>PrintInlineL1String</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>.</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>The next <code>JSR</code> appears to be followed by a null-terminated string, so
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we'll need something 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-src.png" alt="t4-inlinenull-src"/>
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</div>
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<div class="grid-item-text">
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<p>Go back into Project Properties
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and add the script called "InlineNullTermString.cs" from the project directory.
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This script is slightly different, in that it handles any <code>JSR</code> to a label
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that starts with <code>PrintInlineNullString</code>. So let's give it a couple of
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those.</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>L1027</code>"),
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click <samp>Create Label</samp>,
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and set the label to "<kbd>PrintInlineNullStringOne</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>. Repeat the process on line $1019
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("<code>L1028</code>"), setting the label to "<kbd>PrintInlineNullStringTwo</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-text">
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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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<p>Extension scripts can make your life much easier, but they do require
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some programming experience. See the SourceGen manual for more details.</p>
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</div>
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