<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html;charset=US-ASCII">
<meta name="generator" content="ZealOS V1.07">
<style type="text/css">
body {background-color:#1f1f1f;}
.cF0{color:#e3e3e3;background-color:#1f1f1f;}
.cF1{color:#4f84a6;background-color:#1f1f1f;}
.cF2{color:#73a255;background-color:#1f1f1f;}
.cF3{color:#297582;background-color:#1f1f1f;}
.cF4{color:#b34f4b;background-color:#1f1f1f;}
.cF5{color:#8a52c3;background-color:#1f1f1f;}
.cF6{color:#b7822f;background-color:#1f1f1f;}
.cF7{color:#444444;background-color:#1f1f1f;}
.cF8{color:#6d6d6d;background-color:#1f1f1f;}
.cF9{color:#94bfde;background-color:#1f1f1f;}
.cFA{color:#a1ce97;background-color:#1f1f1f;}
.cFB{color:#6db4be;background-color:#1f1f1f;}
.cFC{color:#e88e88;background-color:#1f1f1f;}
.cFD{color:#ca94e8;background-color:#1f1f1f;}
.cFE{color:#d4b475;background-color:#1f1f1f;}
.cFF{color:#1f1f1f;background-color:#1f1f1f;}
</style>
</head>
<body>
<pre style="font-family:monospace;font-size:12pt">
<a name="l1"></a><span class=cFA>/* Graphics Not Rendered in HTML */</span><span class=cF0>
<a name="l2"></a>
<a name="l3"></a>
<a name="l4"></a>
<a name="l5"></a>
<a name="l6"></a>
<a name="l7"></a>
<a name="l8"></a>
<a name="l9"></a>
<a name="l10"></a>
<a name="l11"></a>
<a name="l12"></a>
<a name="l13"></a>
<a name="l14"></a>
<a name="l15"></a>
<a name="l16"></a>
<a name="l17"></a>
<a name="l18"></a>
<a name="l19"></a>
<a name="l20"></a>
<a name="l21"></a>
<a name="l22"></a>
<a name="l23"></a>
<a name="l24"></a>
<a name="l25"></a>
<a name="l26"></a>
<a name="l27"></a>
<a name="l28"></a>There is a symbol (hash) table for each task. When a symbol is not found, the parent task's symbol table is checked. All
<a name="l29"></a>tasks chain back to the </span><span class=cF2>System</span><span class=cF0> task.
<a name="l30"></a>
<a name="l31"></a>ZealOS symbol tables are implemented with an array of linked-lists. A num is generated from a string by </span><a href="https://zeal-operating-system.github.io/ZealOS/Kernel/KHashA.ZC.html#l258"><span class=cF4>HashStr</span></a><span class=cF0>() to index
<a name="l32"></a>into the array of linked-lists. Multiple strings can generate the same num, so linked-lists are built. Newer entries
<a name="l33"></a>overshadow older ones.
<a name="l34"></a>
<a name="l35"></a>There are various types of entries. See </span><a href="https://zeal-operating-system.github.io/ZealOS/Kernel/KernelA.HH.html#l822"><span class=cF4>Hash Entry Types</span></a><span class=cF0>.
<a name="l36"></a>
<a name="l37"></a></span><span class=cF5>Symbol Look-up</span><span class=cF0> (Used many places including the </span><a href="https://zeal-operating-system.github.io/ZealOS/Compiler/Lex.ZC.html#l596"><span class=cF4>JIT Compiler</span></a><span class=cF0> and </span><a href="https://zeal-operating-system.github.io/ZealOS/Kernel/KLoad.ZC.html#l24"><span class=cF4>Loader</span></a><span class=cF0>.)
<a name="l38"></a>1) Symbol name is </span><a href="https://zeal-operating-system.github.io/ZealOS/Kernel/KHashA.ZC.html#l4"><span class=cF4>hashed</span></a><span class=cF0> by adding and shifting the ASCII of all chars.
<a name="l39"></a>2) </span><a href="https://zeal-operating-system.github.io/ZealOS/Kernel/KernelA.HH.html#l783"><span class=cF4>hash table</span></a><span class=cF0>->body[] array is indexed.
<a name="l40"></a>3) Linked-list is traversed until match of text and type of entry.
<a name="l41"></a>4) If not found, </span><a href="https://zeal-operating-system.github.io/ZealOS/Kernel/KernelA.HH.html#l783"><span class=cF4>hash table</span></a><span class=cF0>->next table is searched.
<a name="l42"></a>
<a name="l43"></a>Duplicate entries are allowed -- they overshadow old entries.
<a name="l44"></a>
<a name="l45"></a></span><span class=cF5>Address-to-Symbol Look-up</span><span class=cF0> (Slow because not important. We could use trees.)
<a name="l46"></a>1) FunSeg Cache is </span><a href="https://zeal-operating-system.github.io/ZealOS/Kernel/FunSeg.ZC.html#l137"><span class=cF4>scanned</span></a><span class=cF0>.
<a name="l47"></a>2) Hash Tables are </span><a href="https://zeal-operating-system.github.io/ZealOS/Kernel/FunSeg.ZC.html#l64"><span class=cF4>scanned</span></a><span class=cF0>.
</span></pre></body>
</html>