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131 lines
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<title>What This Module Does</title>
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<link href="../docs-assets/Breadcrumbs.css" rel="stylesheet" rev="stylesheet" type="text/css">
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<meta name="viewport" content="width=device-width initial-scale=1">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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</head>
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<body class="commentary-font">
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<nav role="navigation">
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<h1><a href="../index.html">
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<img src="../docs-assets/Inform.png" height=72">
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</a></h1>
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<ul><li><a href="../compiler.html">compiler tools</a></li>
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<li><a href="../other.html">other tools</a></li>
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<li><a href="../extensions.html">extensions and kits</a></li>
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<li><a href="../units.html">unit test tools</a></li>
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</ul><h2>Compiler Webs</h2><ul>
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<li><a href="../inbuild/index.html">inbuild</a></li>
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<li><a href="../inform7/index.html">inform7</a></li>
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<li><a href="../inter/index.html">inter</a></li>
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</ul><h2>Inbuild Modules</h2><ul>
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<li><a href="../supervisor-module/index.html">supervisor</a></li>
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</ul><h2>Inform7 Modules</h2><ul>
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<li><a href="../core-module/index.html">core</a></li>
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<li><a href="../assertions-module/index.html">assertions</a></li>
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<li><a href="../values-module/index.html">values</a></li>
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<li><a href="../knowledge-module/index.html">knowledge</a></li>
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<li><a href="../imperative-module/index.html">imperative</a></li>
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<li><a href="../runtime-module/index.html">runtime</a></li>
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<li><a href="../if-module/index.html">if</a></li>
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<li><a href="../multimedia-module/index.html">multimedia</a></li>
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<li><a href="../index-module/index.html">index</a></li>
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</ul><h2>Inter Modules</h2><ul>
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<li><a href="../bytecode-module/index.html">bytecode</a></li>
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<li><a href="../building-module/index.html">building</a></li>
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<li><a href="../pipeline-module/index.html">pipeline</a></li>
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<li><a href="index.html"><span class="selectedlink">final</span></a></li>
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</ul><h2>Services</h2><ul>
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<li><a href="../arch-module/index.html">arch</a></li>
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<li><a href="../calculus-module/index.html">calculus</a></li>
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<li><a href="../html-module/index.html">html</a></li>
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<li><a href="../inflections-module/index.html">inflections</a></li>
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<li><a href="../kinds-module/index.html">kinds</a></li>
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<li><a href="../linguistics-module/index.html">linguistics</a></li>
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<li><a href="../problems-module/index.html">problems</a></li>
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<li><a href="../syntax-module/index.html">syntax</a></li>
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<li><a href="../words-module/index.html">words</a></li>
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<li><a href="../../../inweb/docs/foundation-module/index.html">foundation</a></li>
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</ul>
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</nav>
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<main role="main">
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<!--Weave of 'What This Module Does' generated by Inweb-->
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<div class="breadcrumbs">
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<ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="../compiler.html">Inter Modules</a></li><li><a href="index.html">final</a></li><li><a href="index.html#P">Preliminaries</a></li><li><b>What This Module Does</b></li></ul></div>
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<p class="purpose">An overview of the final module's role and abilities.</p>
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<ul class="toc"><li><a href="P-wtmd.html#SP1">§1. Prerequisites</a></li><li><a href="P-wtmd.html#SP2">§2. Finally final</a></li></ul><hr class="tocbar">
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<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>§1. Prerequisites. </b>The final module is a part of the Inform compiler toolset. It is
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presented as a literate program or "web". Before diving in:
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</p>
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<ul class="items"><li>(a) It helps to have some experience of reading webs: see <a href="../../../inweb/docs/index.html" class="internal">inweb</a> for more.
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</li><li>(b) The module is written in C, in fact ANSI C99, but this is disguised by the
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fact that it uses some extension syntaxes provided by the <a href="../../../inweb/docs/index.html" class="internal">inweb</a> literate
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programming tool, making it a dialect of C called InC. See <a href="../../../inweb/docs/index.html" class="internal">inweb</a> for
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full details, but essentially: it's C without predeclarations or header files,
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and where functions have names like <span class="extract"><span class="extract-syntax">Tags::add_by_name</span></span> rather than just <span class="extract"><span class="extract-syntax">add_by_name</span></span>.
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</li><li>(c) This module uses other modules drawn from the <a href="../compiler.html" class="internal">compiler</a>, and also
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uses a module of utility functions called <a href="../../../inweb/docs/foundation-module/index.html" class="internal">foundation</a>.
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For more, see <a href="../../../inweb/docs/foundation-module/P-abgtf.html" class="internal">A Brief Guide to Foundation (in foundation)</a>.
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</li></ul>
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<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>§2. Finally final. </b>The final module is aptly named, in that it is the very last stage in compiling
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an Inform project. Everything up to this module has been generating a tree of
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Inter code, which is (to a large extent) an abstract, general-purpose description
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of a program. We finally turn that into an Inform 6 program, or a C program,
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or some other concrete expression of that program.
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</p>
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<p class="commentary">This module has a very simple interface to the rest of the tool chain: it
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simply provides a single Inter pipeline stage called <span class="extract"><span class="extract-syntax">generate</span></span>. See
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<a href="2-cg.html#SP1" class="internal">CodeGen::create_pipeline_stage</a>. When this stage is reached, the function
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<a href="2-cg.html#SP1" class="internal">CodeGen::run_pipeline_stage</a> is run. This then creates a <a href="2-cg.html#SP2" class="internal">code_generation</a>
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object, which holds all the temporary storage and configuration details for a
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single act of code-generation. The most important of those details is the
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choice of which <a href="2-cg2.html#SP1" class="internal">code_generator</a> to use — see below.
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</p>
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<p class="commentary firstcommentary"><a id="SP3" class="paragraph-anchor"></a><b>§3. </b>The module creates a small number of //code_generator//s, one for each
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possible output format. For example, <a href="4-fi6.html#SP1" class="internal">I6Target::create_generator</a> creates
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one which represents "output Inform 6 code, please"; <a href="5-fnc.html#SP1" class="internal">CTarget::create_generator</a>
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creates one for "output ANSI C-99 code, please".
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</p>
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<p class="commentary">If you are considering adding a new output format, say for JavaScript or Python,
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that should be done by adding a new <a href="2-cg2.html#SP1" class="internal">code_generator</a>. Although the default
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generator is the Inform 6 one, that is in some ways misleadingly simple in
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design because Inter, our intermediate format, was originally designed as a
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sort of abstract paraphrase of Inform 6 — which means that it's quite easy
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to turn Inter to I6. The C code generator is a much better example of the real
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issues likely to present themselves. So reading through the chapter on C is
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probably the best way to get an idea of the task.
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</p>
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<p class="commentary firstcommentary"><a id="SP4" class="paragraph-anchor"></a><b>§4. </b>It seems likely that many if not most of the formats we will ever need to
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generate will be procedural programming languages of the sort usually called
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C-like, and we want to avoid duplicated effort. A generic algorithm called
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<a href="2-vnl.html" class="internal">Vanilla</a> is therefore provided: a generator can, if it wishes, make use of
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this to simplify its work, and both our C and Inform 6 generators do so.
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</p>
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<nav role="progress"><div class="progresscontainer">
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<ul class="progressbar"><li class="progressprevoff">❮</li><li class="progresscurrentchapter">P</li><li class="progresscurrent">wtmd</li><li class="progresschapter"><a href="1-fm.html">1</a></li><li class="progresschapter"><a href="2-cg.html">2</a></li><li class="progresschapter"><a href="3-fti.html">3</a></li><li class="progresschapter"><a href="4-fi6.html">4</a></li><li class="progresschapter"><a href="5-fnc.html">5</a></li><li class="progressnext"><a href="1-fm.html">❯</a></li></ul></div>
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</nav><!--End of weave-->
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</main>
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</body>
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</html>
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