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<section id="internals">
<h1>Internals<a class="headerlink" href="#internals" title="Permalink to this heading">¶</a></h1>
<p>This page contains a sketch of the SMOL implementation internals.</p>
<section id="parsing-and-typechecking-program-flow">
<h2>Parsing and Typechecking Program Flow<a class="headerlink" href="#parsing-and-typechecking-program-flow" title="Permalink to this heading">¶</a></h2>
<ul class="simple">
<li><p>SMOL input files are parsed via antlr; the antlr grammar can be found in <a class="reference external" href="https://github.com/smolang/SemanticObjects/blob/master/src/main/antlr/While.g4">src/main/antlr/While.g4</a>.</p></li>
<li><p>Parsing, typechecking and preparation to run a SMOL program are done by the method <a class="reference external" href="https://github.com/smolang/SemanticObjects/blob/master/src/main/kotlin/no/uio/microobject/runtime/REPL.kt">REPL.initInterpreter</a>, which calls methods according to Figure <a class="reference internal" href="#parsing-flow-ref"><span class="std std-ref">Parsing Flow</span></a>.</p></li>
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<figure class="align-default" id="id1">
<span id="parsing-flow-ref"></span><div class="mermaid">
flowchart TB
input([ `-i` argument or REPL `read` command])
antlr[[WhileParser.program]]
translate[[Translate.generateStatic]]
typecheck[TypeChecker]
interpret[Interpreter]
click antlr "https://github.com/smolang/SemanticObjects/blob/master/src/main/antlr/While.g4" _blank
click translate "https://github.com/smolang/SemanticObjects/blob/master/src/main/kotlin/no/uio/microobject/ast/Translate.kt" _blank
click interpret "https://github.com/smolang/SemanticObjects/blob/master/src/main/kotlin/no/uio/microobject/runtime/Interpreter.kt" _blank
click typecheck "https://github.com/smolang/SemanticObjects/blob/master/src/main/kotlin/no/uio/microobject/type/TypeChecker.kt" _blank
input-- smol filename -->antlr
subgraph REPL.initInterpreter
direction TB
antlr -- antlr tree -->translate
antlr -- antlr tree -->typecheck
translate -- StaticTable -->interpret
translate -- StaticTable -->typecheck
end
</div><figcaption>
<p><span class="caption-text">The program flow of smol program text inside <code class="docutils literal notranslate"><span class="pre">REPL.initInterpreter</span></code></span><a class="headerlink" href="#id1" title="Permalink to this image">¶</a></p>
</figcaption>
</figure>
</section>
<section id="statement-execution">
<h2>Statement Execution<a class="headerlink" href="#statement-execution" title="Permalink to this heading">¶</a></h2>
<p>Executing a smol program is controlled by the <a class="reference external" href="https://github.com/smolang/SemanticObjects/blob/master/src/main/kotlin/no/uio/microobject/runtime/REPL.kt">REPL</a> class. An <code class="docutils literal notranslate"><span class="pre">Interpreter</span></code> object keeps track of the execution state, which consists of a stack of <a class="reference external" href="https://github.com/smolang/SemanticObjects/blob/master/src/main/kotlin/no/uio/microobject/runtime/State.kt#:~:text=data%20class%20StackEntry">StackEntry</a> objects and a <a class="reference external" href="https://github.com/smolang/SemanticObjects/blob/master/src/main/kotlin/no/uio/microobject/runtime/State.kt#:~:text=typealias%20GlobalMemory">GlobalMemory</a> instance, which in turn maps object names to their <a class="reference external" href="https://github.com/smolang/SemanticObjects/blob/master/src/main/kotlin/no/uio/microobject/runtime/State.kt#:~:text=typealias%20Memory">Memory</a>.</p>
<p>A single statement is executed by the method <a class="reference external" href="https://github.com/smolang/SemanticObjects/blob/master/src/main/kotlin/no/uio/microobject/runtime/Interpreter.kt#:~:text=fun%20makeStep">Interpreter.makeStep</a>.</p>
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