mirror of
https://github.com/Zeal-Operating-System/ZealOS.git
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76 lines
4.2 KiB
HTML
Executable file
76 lines
4.2 KiB
HTML
Executable file
<!DOCTYPE HTML>
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html;charset=US-ASCII">
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<meta name="generator" content="ZealOS V0.10">
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<style type="text/css">
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body {background-color:#000000;}
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.cF0{color:#ffffff;background-color:#000000;}
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.cF1{color:#3465a4;background-color:#000000;}
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.cF2{color:#4e9a06;background-color:#000000;}
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.cF3{color:#06989a;background-color:#000000;}
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.cF4{color:#a24444;background-color:#000000;}
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.cF5{color:#75507b;background-color:#000000;}
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.cF6{color:#ce982f;background-color:#000000;}
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.cF7{color:#bcc0b9;background-color:#000000;}
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.cF8{color:#555753;background-color:#000000;}
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.cF9{color:#729fcf;background-color:#000000;}
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.cFA{color:#82bc49;background-color:#000000;}
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.cFB{color:#34e2e2;background-color:#000000;}
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.cFC{color:#ac3535;background-color:#000000;}
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.cFD{color:#ad7fa8;background-color:#000000;}
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.cFE{color:#fce94f;background-color:#000000;}
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.cFF{color:#000000;background-color:#000000;}
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</style>
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</head>
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<body>
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<pre style="font-family:monospace;font-size:12pt">
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<a name="l1"></a><span class=cFA>/* Graphics Not Rendered in HTML */</span><span class=cF0>
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<a name="l27"></a>
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<a name="l28"></a>There is a symbol (hash) table for each task. When a sym is not found, the parent task's sym table is checked. All tasks
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<a name="l29"></a>chain back to the </span><span class=cF2>System</span><span class=cF0> task.
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<a name="l30"></a>
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<a name="l31"></a>ZealOS sym 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.CC.html#l258"><span class=cF4>HashStr</span></a><span class=cF0>() to index
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<a name="l32"></a>into the array of linked-lists. Multiple strings can generate the same num, so linked-lists are built. Newer entries
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<a name="l33"></a>overshadow older ones.
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<a name="l34"></a>
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<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>.
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<a name="l36"></a>
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<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.CC.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.CC.html#l24"><span class=cF4>Loader</span></a><span class=cF0>.)
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<a name="l38"></a>1) Symbol name is </span><a href="https://zeal-operating-system.github.io/ZealOS/Kernel/KHashA.CC.html#l4"><span class=cF4>hashed</span></a><span class=cF0> by adding and shifting the ASCII of all chars.
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<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.
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<a name="l40"></a>3) Linked-list is traversed until match of text and type of entry.
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<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.
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<a name="l42"></a>
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<a name="l43"></a>Duplicate entries are allowed -- they overshadow old entries.
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<a name="l44"></a>
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<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.)
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<a name="l46"></a>1) FunSeg Cache is </span><a href="https://zeal-operating-system.github.io/ZealOS/Kernel/FunSeg.CC.html#l137"><span class=cF4>scanned</span></a><span class=cF0>.
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<a name="l47"></a>2) Hash Tables are </span><a href="https://zeal-operating-system.github.io/ZealOS/Kernel/FunSeg.CC.html#l64"><span class=cF4>scanned</span></a><span class=cF0>.
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</span></pre></body>
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</html>
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