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2021-06-08 00:14:16 +00:00
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<title>Editing Data - SourceGen Tutorial</title>
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2021-07-11 01:46:33 +00:00
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<!--<div class="masthead-title" style="background-image: url('images/screenshot-mainwin.png');">-->
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6502bench
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</div>
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2021-06-08 00:14:16 +00:00
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2021-07-11 01:46:33 +00:00
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2021-06-08 00:14:16 +00:00
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2021-07-11 01:46:33 +00:00
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2021-06-08 00:14:16 +00:00
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2021-06-28 20:37:26 +00:00
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<a id="topnav-home" href=".././">HOME</a>
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<a id="topnav-sgtutorial" class="active" href="../sgtutorial">SourceGen Tutorial</a>
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//
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2021-07-11 01:46:33 +00:00
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<!-- START: incl-sidenav.html active:#sidenav-editing-data -->
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<!-- side navigation bar contents -->
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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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<ul>
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<li id="sidenav-moving-around"><a href="moving-around.html">Moving Around</a></li>
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<li id="sidenav-simple-edits"><a href="simple-edits.html">Simple Edits</a></li>
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<li id="sidenav-labels-symbols"><a href="labels-symbols.html">Labels & Symbols</a></li>
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<li id="sidenav-editing-data" class="active"><a href="editing-data.html">Editing Data Operands</a></li>
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<li id="sidenav-generating-code"><a href="generating-code.html">Generating Code</a></li>
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</ul></li>
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<li id="sidenav-digging-deeper"><a href="digging-deeper.html">Digging Deeper</a>
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<ul>
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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-inline-data"><a href="inline-data.html">Inline Data</a></li>
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<li id="sidenav-odds-ends"><a href="odds-ends.html">Odds & Ends</a></li>
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</ul></li>
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<li id="sidenav-advanced-topics"><a href="advanced-topics.html">Advanced Topics</a>
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<ul>
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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"><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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</ul>
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2021-06-08 00:14:16 +00:00
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2021-07-11 01:46:33 +00:00
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<!-- END: incl-sidenav.html -->
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2021-06-08 00:14:16 +00:00
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<div id="main">
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<h2>Editing Data</h2>
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<div class="grid-container">
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<div class="grid-item-image">
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<img src="images/t1-data-stringblob.png" alt="t1-data-stringblob"/>
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</div>
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<div class="grid-item-text">
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<p>There's some string and numeric data down at the bottom of the file. The
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final string appears to be multiple strings stuck together. (You may need
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to increase the width of the Operand column to see the whole thing.) Notice
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that the opcode for the very last line is '+', which means the operand
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is a continuation of the previous line. Long data items can span multiple
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lines, split every 64 characters (including delimiters), but they are
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still single items: selecting any part selects the whole.</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/t1-data-editdlg-1.png" alt="t1-data-editdlg-1"/>
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</div>
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<div class="grid-item-text">
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<p>Select the last line in the file, then <samp>Actions > Edit Operand</samp>.
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You'll notice that this dialog is much different from the one you got when editing
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the operand of an instruction. At the top it will say "<samp>65 bytes
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selected</samp>". You can format this as a single 65-byte string, as 65 individual
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items, or various things in between. For now, select <samp>Single bytes</samp>,
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and then on the right, select <samp>ASCII (low or high) character</samp>.
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Click <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/t1-data-edited-1.png" alt="t1-data-edited-1"/>
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</div>
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<div class="grid-item-text">
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<p>Each character is now on its own line. The selection still spans the
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same set of addresses.</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/t1-data-editdlg-2.png" alt="t1-data-editdlg-2"/>
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</div>
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<div class="grid-item-text">
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<p>Select address $203D on its own, then Actions > Edit Label. Set the
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label to "<kbd>STR1</kbd>". Move up a bit and select address $2030, then scroll to
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the bottom and shift-click address $2070. Select
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<samp>Actions > Edit Operand</samp>.
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At the top it should now say, "<samp>65 bytes selected in 2 groups</samp>".
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There are two groups because the presence of a label split the data into
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two separate regions. From the <samp>Character encoding</samp> pop-up down
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in the "String" section, make sure <samp>Low or High ASCII</samp> encoding
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is selected, then select the <samp>Mixed character and non-character</samp>
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string type and click <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/t1-data-edited-2.png" alt="t1-data-edited-2"/>
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</div>
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<div class="grid-item-text">
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<p>We now have two <code>.STR</code> lines, one for <samp>"string zero "</samp>,
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and one with the "<samp>STR1</samp>" label and the rest of the string data.
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This is okay,
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but it's not really what we want. The code at $200B appears to be loading
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a 16-bit address from data at $2025, so we want to use that if we can.</p>
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<p>Select <samp>Edit > Undo</samp> three times. You should be back to the
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state where there's a single <code>.STR</code> line at the bottom of
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the file, split across two lines with a '+'.</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/t1-data-string-bytes.png" alt="t1-data-string-bytes"/>
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</div>
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<div class="grid-item-text">
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<p>Select the line at $2026. This is currently formatted as a string,
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but that appears to be incorrect, so let's format it as individual bytes
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instead. There's an easy way to do that: use
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<samp>Actions > Toggle Single-Byte Format</samp>
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(or hit <kbd class="key">Ctrl+B</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 data starting at $2025 appears to be 16-bit little-endian
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addresses that point into the table of strings, so let's format
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them appropriately.</p>
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<!--
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<p>Double-click the operand column on line $2025 ("$30") to open
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the operand data format editor. Because you only have one byte selected,
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most of the options are disabled. This won't do what we want, so
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click <samp>Cancel</samp>.</p>
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-->
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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/t1-data-editdlg-3.png" alt="t1-data-editdlg-3"/>
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</div>
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<div class="grid-item-text">
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<p>Select the line at $2025, then shift-click the line at $202E. Right-click
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and select <samp>Edit Operand</samp>. If you selected the correct set of bytes,
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the top line in the dialog should now say, "<samp>10 bytes selected</samp>".
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Because 10 is a multiple of two, the 16-bit formats are enabled. It's not a multiple
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of 3 or 4, so the 24-bit and 32-bit options are not enabled. Click the
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<samp>16-bit words, little-endian</samp> radio button, then over to the right,
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click the <samp>Address</samp> radio button. Click <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/t1-data-edited-3.png" alt="t1-data-edited-3"/>
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</div>
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<div class="grid-item-text">
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<p>We just told SourceGen that those 10 bytes are actually five 16-bit numeric
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references. SourceGen determined that the addresses are contained in the
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file, and generated labels for each of them. Labels only work if they're
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on their own line, so the long string was automatically split into five
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separate <code>.STR</code> statements.</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>Note we didn't explicitly format the string data. We formatted
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the addresses at $2025, which placed labels at the start of the strings,
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but the strings themselves were automatically detected and formatted
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by SourceGen. By default, SourceGen looks for ASCII strings, but this
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can be changed in the project properties. You can even disable the
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string auto-detection entirely if you want.</p>
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</div>
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</div>
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</div> <!-- #main -->
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<a href="labels-symbols.html" class="btn-previous">« Previous</a>
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<hr/>
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<p>Copyright 2021 faddenSoft</p>
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