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 V1.07">
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<style type="text/css">
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body {background-color:#1f1f1f;}
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.cF0{color:#e3e3e3;background-color:#1f1f1f;}
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.cF1{color:#4f84a6;background-color:#1f1f1f;}
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.cF2{color:#73a255;background-color:#1f1f1f;}
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.cF3{color:#297582;background-color:#1f1f1f;}
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.cF4{color:#b34f4b;background-color:#1f1f1f;}
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.cF5{color:#8a52c3;background-color:#1f1f1f;}
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.cF6{color:#b7822f;background-color:#1f1f1f;}
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.cF7{color:#444444;background-color:#1f1f1f;}
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.cF8{color:#6d6d6d;background-color:#1f1f1f;}
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.cF9{color:#94bfde;background-color:#1f1f1f;}
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.cFA{color:#a1ce97;background-color:#1f1f1f;}
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.cFB{color:#6db4be;background-color:#1f1f1f;}
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.cFC{color:#e88e88;background-color:#1f1f1f;}
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.cFD{color:#ca94e8;background-color:#1f1f1f;}
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.cFE{color:#d4b475;background-color:#1f1f1f;}
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.cFF{color:#1f1f1f;background-color:#1f1f1f;}
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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="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
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<a name="l29"></a>tasks 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 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
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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.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>.)
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<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.
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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="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.ZC.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.ZC.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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