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<title>avram - a virtual machine code interpreter: 2. Virtual Machine Specification</title>

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<a name="Virtual-Machine-Specification"></a>
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<tr><td valign="middle" align="left">[<a href="Bugs.html#Bugs" title="Previous section in reading order"> &lt; </a>]</td>
<td valign="middle" align="left">[<a href="Raw-Material.html#Raw-Material" title="Next section in reading order"> &gt; </a>]</td>
<td valign="middle" align="left"> &nbsp; </td>
<td valign="middle" align="left">[<a href="User-Manual.html#User-Manual" title="Beginning of this chapter or previous chapter"> &lt;&lt; </a>]</td>
<td valign="middle" align="left">[<a href="avram.html#Top" title="Up section"> Up </a>]</td>
<td valign="middle" align="left">[<a href="Library-Reference.html#Library-Reference" title="Next chapter"> &gt;&gt; </a>]</td>
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<td valign="middle" align="left"> &nbsp; </td>
<td valign="middle" align="left"> &nbsp; </td>
<td valign="middle" align="left"> &nbsp; </td>
<td valign="middle" align="left">[<a href="avram.html#Top" title="Cover (top) of document">Top</a>]</td>
<td valign="middle" align="left">[<a href="avram_toc.html#SEC_Contents" title="Table of contents">Contents</a>]</td>
<td valign="middle" align="left">[<a href="Function-Index.html#Function-Index" title="Index">Index</a>]</td>
<td valign="middle" align="left">[<a href="avram_abt.html#SEC_About" title="About (help)"> ? </a>]</td>
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<a name="Virtual-Machine-Specification-1"></a>
<h1 class="chapter">2. Virtual Machine Specification</h1>

<p>This chapter contains a description of the virtual machine implemented
by <code>avram</code>, from the point of view of a person wishing to write a
compiler that generates code for it. Before reading this chapter,
readers should at least skim <a href="User-Manual.html#User-Manual">User Manual</a> in order to see the big
picture. Topics covered in this chapter include data representations,
virtual code semantics, and file formats. A toy programming language is
introduced for illustrative purposes. The sections in this chapter might
not make sense if read out of order the first time through.
</p>
<table class="menu" border="0" cellspacing="0">
<tr><td align="left" valign="top"><a href="Raw-Material.html#Raw-Material">2.1 Raw Material</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">                
</td></tr>
<tr><td align="left" valign="top"><a href="Concrete-Syntax.html#Concrete-Syntax">2.2 Concrete Syntax</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">             
</td></tr>
<tr><td align="left" valign="top"><a href="File-Format.html#File-Format">2.3 File Format</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">                 
</td></tr>
<tr><td align="left" valign="top"><a href="Representation-of-Numeric-and-Textual-Data.html#Representation-of-Numeric-and-Textual-Data">2.4 Representation of Numeric and Textual Data</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">  
</td></tr>
<tr><td align="left" valign="top"><a href="Filter-Mode-Interface.html#Filter-Mode-Interface">2.5 Filter Mode Interface</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">       
</td></tr>
<tr><td align="left" valign="top"><a href="Parameter-Mode-Interface.html#Parameter-Mode-Interface">2.6 Parameter Mode Interface</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">    
</td></tr>
<tr><td align="left" valign="top"><a href="Virtual-Code-Semantics.html#Virtual-Code-Semantics">2.7 Virtual Code Semantics</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">      
</td></tr>
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