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239 lines
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239 lines
11 KiB
HTML
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<title>Editors - 6502bench SourceGen</title>
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<div id=content>
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<h1>6502bench SourceGen: Editors</h1>
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<p><a href="index.html">Back to index</a></p>
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<h2><a name="address">Edit Address</a></h2>
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<p>This adds a target address directive (".ORG") to the current offset.
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If you leave the field blank, the directive will be removed.</p>
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<p>Addresses are always interpreted as hexadecimal. You can prefix
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it with a '$', but that's not necessary.</p>
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<p>24-bit addresses may be written with a bank separator, e.g. "12/3456"
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would resolve to address $123456.</p>
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<p>There will always be an address directive at the start of the list.
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Attempts to remove it will be ignored.</p>
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<h2><a name="flags">Edit Status Flag Override</a></h2>
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<p>The state of the processor status flags are tracked for every
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instruction. Each individual flag is recorded as zero, one, or
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"indeterminate", meaning it could hold either value at the start of
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that instruction. You can override the value of individual flags.</p>
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<p>The 65816 emulation bit, which is not part of the processor status
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register, may also be set in the editor.</p>
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<p>The M, X, and E flags will not be editable unless your CPU configuration
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is set to a 16-bit CPU.</p>
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<h2><a name="label">Edit Label</a></h2>
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<p>Sets or clears a label at the selected offset. The label must have
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the proper form, and not have the same name as another symbol.</p>
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<p>The label may be marked as local, global, or global and exported.
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Local labels may be generated in the assembler output in a
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convenient form, such as a local loop identifier. Global labels are
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always output as-is. Exported labels are added to a table that may
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be imported by other projects.</p>
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<h2><a name="operand">Edit Operand</a></h2>
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<p>Operands can be displayed in a variety of numeric formats, or as a
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symbol. The ASCII character format is only available for operands
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whose value falls into the range of low- or high-ASCII characters.</p>
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<p>Symbols may be used in their entirety, or offset by a byte or two.
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The low / high / bank selector determines which byte is used as the
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low byte. For 16-bit operands, this acts as a shift rather than a byte
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select.</p>
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<p>A few shortcuts are provided when specifying a symbol. As noted in
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the introductory sections, operand symbols are weak references. If the
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symbol hasn't been defined as a label yet, the operand will be formatted
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as hex, which is probably not what you want.</p>
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<p>The default behavior is to just set the operand's symbol.</p>
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<p>For operands that target an offset inside the file, if the target
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address does not yet have a label, and the symbol doesn't exist, you may
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set the symbol as the label on the target address as well. You can do
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this in addition to setting the operand symbol, or in lieu of setting the
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operand symbol. (You will often want to only create the label, and let
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SourceGen convert the numeric reference to a symbolic reference
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automatically.) If you select the "set label instead" option, and the
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operand already had a symbol reference defined, the operand's format will
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be set to default.</p>
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<p>For operands that target an external address, if the symbol doesn't
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exist, you can ask the editor to create a project symbol with the
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appropriate label and address value. The operand symbol will also be set.</p>
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<p>The <code>MVN</code> and <code>MVP</code> instructions on the 65816
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are a bit peculiar, because they have two operands rather than one.
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SourceGen currently only allows you to set one format, which will be
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applied to both operands. If you specify a symbol, the symbol will
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be used twice, adjusted if necessary. (This may be addressed in a
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future release.)</p>
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<h2><a name="data">Edit Data Format</a></h2>
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<p>This dialog offers a variety of choices, and can be used to apply a
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format to a range of offsets. If the range crosses a visual boundary,
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such as a change in address, a user-specified label, or a long comment
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or note, the region will be split. The top of the dialog indicates how
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many bytes have been selected, and how many regions they have been
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divided into.</p>
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<p>(End-of-line comments do <i>not</i> split a region, and will
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disappear if they end up inside a multi-byte data item.)</p>
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<p>The "Simple Data" items behave the same as their equivalents in the
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Edit Operand dialog. However, because the width is not determined by
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an instruction opcode, you will need to specify how wide each item is,
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and the byte order.</p>
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<p>Suppose you find a table of 16-bit addresses in the code. Click on
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the first byte, shift-click the last byte, then select the Edit Data menu
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item. The number of bytes selected should be even. Select
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"16-bit words, little-endian", then to the right "Address". When you
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click OK, the selected data will be formatted as a series of 16-bit
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address values.</p>
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<p>The "Bulk Data" items can represent large chunks of data compactly.
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The "fill" option is only available if all selected bytes have the
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same value.</p>
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<p>The "String" items are enabled or disabled depending on whether the
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data you have selected is in the appropriate format. For example,
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"Null-terminated strings" is only enabled if the data is exclusively
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ASCII characters followed by $00. Zero-length strings are allowed,
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but only if some non-zero-length strings are present.</p>
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<p>Standard ASCII and "high ASCII" are both supported, but strings must
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be composed exclusively of one or the other.</p>
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<p>To avoid burying a label in the middle of a data item, contiguous areas
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are split at labels. This can sometimes have unexpected effects. For
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example, this can be formatted as two 16-bit words or one 32-bit word:</p>
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<pre>
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.DD1 $01
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.DD1 $ef
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.DD1 $01
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.DD1 $f0
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</pre>
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<p>With a label in the middle, it be formatted as two 16-bit words, but
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not as a 32-bit word:</p>
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<pre>
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.DD1 $01
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.DD1 $ef
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LABEL .DD1 $01
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.DD1 $f0
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CODE LDA LABEL
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</pre>
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<p>If this is inconvenient, you can add a label at a 32-bit boundary, and
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reference that instead:</p>
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<pre>
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LABEL .DD1 $01
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.DD1 $ef
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.DD1 $01
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.DD1 $f0
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CODE LDA LABEL+2
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</pre>
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<p>With the label out of the way, the data can be formatted as desired.</p>
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<h2><a name="comment">Edit Comment</a></h2>
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<p>Enter an end-of-line (EOL) comment, or leave the text field blank to
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delete it. EOL comments may be placed on instruction and data lines, but
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not on assembler directives.</p>
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<p>It's wise to restrict comments to the ASCII character set, because
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not all assemblers can accept UTF-8 input. Code generators for such
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assemblers will convert non-ASCII characters to '?' or something similar.
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If this isn't a concern, you can enter any characters you like.</p>
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<p>There is no fixed limit on the number of characters, but you may
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want to limit the overall length if you're hoping to create 80-column
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output. Some retro assemblers may have hard line length limitations,
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which could result in the comment being truncated in generated sources.</p>
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<p>A semicolon (';') is placed at the start of the line. If an assembler
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has different conventions, a different character may be used. You don't
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need to include a delimiter in the comment field.</p>
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<p>Comments on platform symbols are read from the platform symbol file, and
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cannot be edited from within SourceGen. Comments on project symbols are
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stored in the project file, and can be edited with the project symbol
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editor.</p>
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<h2><a name="long-comment">Edit Long Comment</a></h2>
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<p>Long comments can be arbitrarily long and span multiple lines. They
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will be word-wrapped at a line width of your choosing. They're always
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drawn with a fixed-width font, so you can create ASCII-art diagrams.
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Comment delimiters are added automatically at the start of each line.</p>
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<p>For a true retro look you can "box" the comment with asterisks. You
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can create a fill-width row of asterisks by putting a '*' on a line by
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itself. (Assembly source generators are allowed to use a character
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other than '*' for the output, e.g. they might use a full set of
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box outline characters, though that's somewhat against the spirit of
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the thing.)</p>
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<p>The bottom window will update automatically as you type, showing what
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the output is expected to look like. The actual assembler source output
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will depend on features of the target assembler, such as comment
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delimiter choices and maximum line length limitations. For example,
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Merlin allows a leading '*' to indicate a comment, while cc65 does not,
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so cc65 code uses ";*' instead. Because the length limitation affects
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the length of the line, not just the comment text, an asterisk-boxed
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comment will have one fewer character per line in cc65 output.</p>
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<p>Clear the text field to delete the comment.</p>
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<p>You can use Ctrl+Enter as a keyboard shortcut for "OK".</p>
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<p>The long comment at the very top of the project is special, as it's
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not associated with a file offset. If you delete it, you can get it
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back by using Edit > Edit Header Comment.</p>
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<h2><a name="note">Edit Note</a></h2>
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<p>Notes are similar to long comments, in that they can be arbitrarily
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long and span multiple lines. However, because they're never included
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in generated output, options like line width formatting and boxing
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aren't relevant.</p>
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<p>Instead, you can select a highlight color for the note to make it
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stand out. You may want to assign certain colors to specific things,
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e.g. blue for "I don't know what this is" or green for "this is a
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bookmark for the really interesting stuff". The color will be applied
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to the note in the code list and in the "Notes" window.</p>
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<p>Clear the text field to delete the note.</p>
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<p>You can use Ctrl+Enter as a keyboard shortcut for "OK".</p>
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<h2><a name="project-symbol">Edit Project Symbol</a></h2>
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<p>This is used to edit the properties of a project symbol.</p>
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<p>The label must meet the criteria for symbols (see
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<a href="intro.html#about-symbols">All About Symbols</a>), and must
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not have the same name as another project symbol. It can overlap
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with platform symbols and user labels.</p>
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<p>The value may be entered in decimal, hexadecimal, or binary. The
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base you choose will be remembered, so that the value will be displayed
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the same way when used in a .EQ directive.</p>
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<p>If you enter a comment, it will be placed at the end of the line of
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the .EQ directive.</p>
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<p>Symbols marked as "address" will be applied automatically when an
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operand references an address outside the scope of the data file. Symbols
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marked as "constant" will not, though you can still specify it manually.</p>
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