mirror of
https://github.com/danbulant/Cosmos
synced 2026-05-19 20:39:01 +00:00
121 lines
3.8 KiB
HTML
121 lines
3.8 KiB
HTML
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="index.html.cs" Inherits="XSharp_index" %>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<title></title>
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</head>
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<body>
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<h3>
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X#<p>
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X# compiles C# code into assembly, but does it as it runs. This allows the use
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of intellisense, and modification of the output using C#.</p>
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<li>One of the goals of Cosmos is the need to write very little assembly, so only
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debug stub, compiler users, etc need assembly. Too much work on X# may not be
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worth the resources required.</li>
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<h3>
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Consts</h3>
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<p>
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ref with #. else user would need to use @, and if not woudl get [value] instead.
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ie consts have direct ref as default while fields have indirect as default. Also
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treat consts diff since they can only be read from and not assigned, and at
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parse time we dont know if a label is const, var or other.</p>
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<p>
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all consts are group based. Need provision for globals in future. Consts cannot
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be local.</p>
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<h3>
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Method</h3>
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<p>
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name()</p>
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<li>
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<h3>
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Usage</h3>
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<p>
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look in tokenpatterns.cs for more</p>
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<h3>
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Labels</h3>
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<p>
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..Global</p>
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<p>
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.Group</p>
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<p>
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Local</p>
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<p>
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Think of it like a directory path, .. and . are up.</p>
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<h3>
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Checkpoint 'text'</h3>
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<p>
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</p>
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<h3>
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if reg = x goto label</h3>
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<p>
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=<br />
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!=<br />
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><br />
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>=<br />
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<<br />
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<=</p>
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<h3>
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Register Arithmetic</h3>
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<p>
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EBP = EBP + 32;<br />
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This is not possible because C# operator overloading does not look at return
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type but only the operand types. That is C# sees Register + int. If we supported
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the previous example, then X# could not support:<br />
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EAX = Memory[EBP + 4];<br />
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In short, C# sees these two as the same and so X# can only support one. Because
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the memory addressing is used more frequently than adding a constant to a
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register, X# supports it.<br />
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To add a constant to a register use:<br />
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EBP.Add(32);</p>
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<h3>
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Register-- / Register++</h3>
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<p>
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Valid and usable. Correspond to Inc and Dec.</p>
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<h3>
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Register Shifting</h3>
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<p>
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Example:<br />
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EAX << 2</p>
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<h3>
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Rotate</h3>
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<p>
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~ "infinite" shift because it loops </p>
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<h3>
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Register Methods</h3>
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<ul>
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<li>Add</li>
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<li>Sub</li>
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<li>Compare</li>
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<li>Test</li>
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</ul>
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<h3>
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Register = int</h3>
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<p>
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Example:<br />
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EAX = $40<br />
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EAX = 64</p>
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<h3>
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Register = Register</h3>
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<p>
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Example:<br />
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EAX = EBP</p>
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<h3>
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Register = Memory[Address];<br />
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Register = Memory[Address + int];</h3>
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<p>
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Address can be a string label. i.e. EAX = Memory["Data1"]</p>
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<h3>
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Register = Port[x]<br />
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Register = Port[EAX]</h3>
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<p>
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public static implicit operator RegisterEAX(Cosmos.Assembler.ElementReference aReference) {
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Instance.Move(aReference); return Instance; }
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</p>
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<h3>
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Register = Label</h3>
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<p>
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Example:<br />
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EAX = AddressOf("Labelname");</p>
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</body>
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</html>
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