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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>Generating Inform 6</title>
<link href="../docs-assets/Breadcrumbs.css" rel="stylesheet" rev="stylesheet" type="text/css">
<meta name="viewport" content="width=device-width initial-scale=1">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="../docs-assets/Contents.css" rel="stylesheet" rev="stylesheet" type="text/css">
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<link href="../docs-assets/Base.css" rel="stylesheet" rev="stylesheet" type="text/css">
<script>
function togglePopup(material_id) {
var popup = document.getElementById(material_id);
popup.classList.toggle("show");
}
</script>
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</head>
<body class="commentary-font">
<nav role="navigation">
<h1><a href="../index.html">
<img src="../docs-assets/Inform.png" height=72">
</a></h1>
<ul><li><a href="../index.html">home</a></li>
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<main role="main">
<!--Weave of 'Generating Inform 6' generated by Inweb-->
<div class="breadcrumbs">
<ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="../intern.html">Inter Modules</a></li><li><a href="index.html">final</a></li><li><a href="index.html#4">Chapter 4: Inform 6</a></li><li><b>Generating Inform 6</b></li></ul></div>
<p class="purpose">To generate I6 code from intermediate code.</p>
<ul class="toc"><li><a href="4-fi6.html#SP1">&#167;1. Target</a></li></ul><hr class="tocbar">
<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>&#167;1. Target. </b>This generator produces Inform 6 source code, using the Vanilla algorithm.
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">I6Target::create_generator</span><button class="popup" onclick="togglePopup('usagePopup1')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup1">Usage of <span class="code-font"><span class="function-syntax">I6Target::create_generator</span></span>:<br/>Code Generators - <a href="2-cg2.html#SP3">&#167;3</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">void</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">code_generator</span><span class="plain-syntax"> *</span><span class="identifier-syntax">inform6_generator</span><span class="plain-syntax"> = </span><a href="2-cg2.html#SP1" class="function-link"><span class="function-syntax">Generators::new</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">I</span><span class="string-syntax">"inform6"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">METHOD_ADD</span><span class="plain-syntax">(</span><span class="identifier-syntax">inform6_generator</span><span class="plain-syntax">, </span><span class="constant-syntax">BEGIN_GENERATION_MTID</span><span class="plain-syntax">, </span><a href="4-fi6.html#SP4" class="function-link"><span class="function-syntax">I6Target::begin_generation</span></a><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">METHOD_ADD</span><span class="plain-syntax">(</span><span class="identifier-syntax">inform6_generator</span><span class="plain-syntax">, </span><span class="constant-syntax">MANGLE_IDENTIFIER_MTID</span><span class="plain-syntax">, </span><a href="4-fi6.html#SP6" class="function-link"><span class="function-syntax">I6Target::mangle</span></a><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">METHOD_ADD</span><span class="plain-syntax">(</span><span class="identifier-syntax">inform6_generator</span><span class="plain-syntax">, </span><span class="constant-syntax">OFFER_PRAGMA_MTID</span><span class="plain-syntax">, </span><a href="4-fi6.html#SP5" class="function-link"><span class="function-syntax">I6Target::offer_pragma</span></a><span class="plain-syntax">)</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">METHOD_ADD</span><span class="plain-syntax">(</span><span class="identifier-syntax">inform6_generator</span><span class="plain-syntax">, </span><span class="constant-syntax">END_GENERATION_MTID</span><span class="plain-syntax">, </span><a href="4-fi6.html#SP7" class="function-link"><span class="function-syntax">I6Target::end_generation</span></a><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="4-i6c2.html#SP1" class="function-link"><span class="function-syntax">I6TargetCode::create_generator</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">inform6_generator</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="4-i6o.html#SP1" class="function-link"><span class="function-syntax">I6TargetObjects::create_generator</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">inform6_generator</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="4-i6c.html#SP1" class="function-link"><span class="function-syntax">I6TargetConstants::create_generator</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">inform6_generator</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="4-i6gv.html#SP1" class="function-link"><span class="function-syntax">I6TargetVariables::create_generator</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">inform6_generator</span><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>&#167;2. </b>We will write a single output file of I6 source code, but segmented as follows:
</p>
<pre class="definitions code-font"><span class="definition-keyword">enum</span> <span class="constant-syntax">ICL_directives_I7CGS</span>
<span class="definition-keyword">enum</span> <span class="constant-syntax">compiler_versioning_matter_I7CGS</span>
<span class="definition-keyword">enum</span> <span class="constant-syntax">attributes_I7CGS</span>
<span class="definition-keyword">enum</span> <span class="constant-syntax">properties_I7CGS</span>
<span class="definition-keyword">enum</span> <span class="constant-syntax">global_variables_I7CGS</span>
<span class="definition-keyword">enum</span> <span class="constant-syntax">global_variables_array_I7CGS</span>
<span class="definition-keyword">enum</span> <span class="constant-syntax">constants_I7CGS</span>
<span class="definition-keyword">enum</span> <span class="constant-syntax">fake_actions_I7CGS</span>
<span class="definition-keyword">enum</span> <span class="constant-syntax">arrays_I7CGS</span>
<span class="definition-keyword">enum</span> <span class="constant-syntax">classes_I7CGS</span>
<span class="definition-keyword">enum</span> <span class="constant-syntax">objects_I7CGS</span>
<span class="definition-keyword">enum</span> <span class="constant-syntax">property_stubs_I7CGS</span>
<span class="definition-keyword">enum</span> <span class="constant-syntax">functions_I7CGS</span>
<span class="definition-keyword">enum</span> <span class="constant-syntax">command_grammar_I7CGS</span>
</pre>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">I6_target_segments</span><span class="plain-syntax">[] = {</span>
<span class="plain-syntax"> </span><span class="constant-syntax">ICL_directives_I7CGS</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="constant-syntax">compiler_versioning_matter_I7CGS</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="constant-syntax">attributes_I7CGS</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="constant-syntax">properties_I7CGS</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="constant-syntax">global_variables_I7CGS</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="constant-syntax">global_variables_array_I7CGS</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="constant-syntax">constants_I7CGS</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="constant-syntax">fake_actions_I7CGS</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="constant-syntax">arrays_I7CGS</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="constant-syntax">classes_I7CGS</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="constant-syntax">objects_I7CGS</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="constant-syntax">property_stubs_I7CGS</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="constant-syntax">functions_I7CGS</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="constant-syntax">command_grammar_I7CGS</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> -1</span>
<span class="plain-syntax">};</span>
</pre>
<p class="commentary firstcommentary"><a id="SP3" class="paragraph-anchor"></a><b>&#167;3. </b>This generator uses the following state data while it works:
</p>
<pre class="definitions code-font"><span class="definition-keyword">define</span> <span class="identifier-syntax">I6_GEN_DATA</span><span class="plain-syntax">(</span><span class="identifier-syntax">x</span><span class="plain-syntax">) ((</span><span class="reserved-syntax">I6_generation_data</span><span class="plain-syntax"> *) (</span><span class="identifier-syntax">gen</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">generator_private_data</span><span class="plain-syntax">))-&gt;</span><span class="identifier-syntax">x</span>
</pre>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">typedef</span><span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="reserved-syntax">I6_generation_data</span><span class="plain-syntax"> {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">attribute_slots_used</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">value_ranges_needed</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">value_property_holders_needed</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">DebugAttribute_seen</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">subterfuge_count</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">CLASS_DEFINITION</span>
<span class="plain-syntax">} </span><span class="reserved-syntax">I6_generation_data</span><span class="plain-syntax">;</span>
<span class="reserved-syntax">I6_generation_data</span><span class="plain-syntax"> *</span><span class="function-syntax">I6Target::new_data</span><button class="popup" onclick="togglePopup('usagePopup2')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup2">Usage of <span class="code-font"><span class="function-syntax">I6Target::new_data</span></span>:<br/><a href="4-fi6.html#SP4">&#167;4</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">void</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">I6_generation_data</span><span class="plain-syntax"> *</span><span class="identifier-syntax">data</span><span class="plain-syntax"> = </span><span class="identifier-syntax">CREATE</span><span class="plain-syntax">(</span><span class="reserved-syntax">I6_generation_data</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">data</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">attribute_slots_used</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">data</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">value_ranges_needed</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">data</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">value_property_holders_needed</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">data</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">DebugAttribute_seen</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">data</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">subterfuge_count</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">data</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
</pre>
<ul class="endnotetexts"><li>The structure I6_generation_data is accessed in 5/ccn, 5/com and here.</li></ul>
<p class="commentary firstcommentary"><a id="SP4" class="paragraph-anchor"></a><b>&#167;4. </b>We return <span class="extract"><span class="extract-syntax">FALSE</span></span> here to signal that we want the Vanilla algorithm to
manage the process.
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">I6Target::begin_generation</span><button class="popup" onclick="togglePopup('usagePopup3')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup3">Usage of <span class="code-font"><span class="function-syntax">I6Target::begin_generation</span></span>:<br/><a href="4-fi6.html#SP1">&#167;1</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">code_generator</span><span class="plain-syntax"> *</span><span class="identifier-syntax">gtr</span><span class="plain-syntax">, </span><span class="reserved-syntax">code_generation</span><span class="plain-syntax"> *</span><span class="identifier-syntax">gen</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><a href="2-cg.html#SP10" class="function-link"><span class="function-syntax">CodeGen::create_segments</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><a href="4-fi6.html#SP3" class="function-link"><span class="function-syntax">I6Target::new_data</span></a><span class="plain-syntax">(), </span><span class="identifier-syntax">I6_target_segments</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="4-fi6.html#SP4_1" class="named-paragraph-link"><span class="named-paragraph">Compile some I6 oddities</span><span class="named-paragraph-number">4.1</span></a></span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="4-fi6.html#SP4_2" class="named-paragraph-link"><span class="named-paragraph">Compile some veneer replacement code</span><span class="named-paragraph-number">4.2</span></a></span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP4_1" class="paragraph-anchor"></a><b>&#167;4.1. </b>Defining a constant called <span class="extract"><span class="extract-syntax">Grammar__Version</span></span> tells Inform 6 which storage
layout to use for command parser grammar. 2 is the shiny, modern one &mdash; 1995
not 1993.
</p>
<p class="commentary">The I6 compiler adds a thin layer of hidden code to every program it compiles,
called the "veneer". This layer of code requires a global variable called <span class="extract"><span class="extract-syntax">debug_flag</span></span>
to exist, and since that doesn't exist in the Inter tree, we must make it by hand.
</p>
<p class="commentary">The <span class="extract"><span class="extract-syntax">or_tmp_var</span></span> variable is not significant to I6, and is just a temporary location
we will need for the code we are compiling. But this seems a good time to make it.
</p>
<p class="commentary">See the Inform 6 Technical Manual for more on these oddities.
</p>
<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Compile some I6 oddities</span><span class="named-paragraph-number">4.1</span></span><span class="comment-syntax"> =</span>
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="plain-syntax"> </span><span class="reserved-syntax">segmentation_pos</span><span class="plain-syntax"> </span><span class="identifier-syntax">saved</span><span class="plain-syntax"> = </span><a href="2-cg.html#SP12" class="function-link"><span class="function-syntax">CodeGen::select</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="constant-syntax">compiler_versioning_matter_I7CGS</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">OUT</span><span class="plain-syntax"> = </span><a href="2-cg.html#SP14" class="function-link"><span class="function-syntax">CodeGen::current</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"Constant Grammar__Version 2;\n"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"Global debug_flag;\n"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"Global or_tmp_var;\n"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="2-cg.html#SP12" class="function-link"><span class="function-syntax">CodeGen::deselect</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="identifier-syntax">saved</span><span class="plain-syntax">);</span>
</pre>
<ul class="endnotetexts"><li>This code is used in <a href="4-fi6.html#SP4">&#167;4</a>.</li></ul>
<p class="commentary firstcommentary"><a id="SP4_2" class="paragraph-anchor"></a><b>&#167;4.2. </b>As noted above, I6 will add a veneer of code to what we compile. That veneer
will contain a function called <span class="extract"><span class="extract-syntax">OC__Cl</span></span> which implements "ofclass", the I6
condition determining whether an object belongs to a given class. The I6
compiler's stock copy of <span class="extract"><span class="extract-syntax">OC__Cl</span></span> doesn't work right with I7 code, though,
so we replace it here with a better one. (The I6 compiler uses our definition
in preference to its own.)
</p>
<p class="commentary">We need do this only when compiling to the Z-machine; our replacement function
is implemented in pure Z-machine assembly language. See the Z-Machine Standards
Document for a specification.
</p>
<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Compile some veneer replacement code</span><span class="named-paragraph-number">4.2</span></span><span class="comment-syntax"> =</span>
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="plain-syntax"> </span><span class="reserved-syntax">segmentation_pos</span><span class="plain-syntax"> </span><span class="identifier-syntax">saved</span><span class="plain-syntax"> = </span><a href="2-cg.html#SP12" class="function-link"><span class="function-syntax">CodeGen::select</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="constant-syntax">functions_I7CGS</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">OUT</span><span class="plain-syntax"> = </span><a href="2-cg.html#SP14" class="function-link"><span class="function-syntax">CodeGen::current</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"#Ifdef TARGET_ZCODE;\n"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"Global max_z_object;\n"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"#Ifdef Z__Region;\n"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"[ OC__Cl obj cla j a n objflag;\n"</span><span class="plain-syntax">); </span><span class="identifier-syntax">INDENT</span><span class="plain-syntax">;</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"@jl obj 1 ?NotObj;\n"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"@jg obj max_z_object ?NotObj;\n"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"@inc objflag;\n"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"#Ifdef K1_room;\n"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"@je cla K1_room ?~NotRoom;\n"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"@test_attr obj mark_as_room ?rtrue;\n"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"@rfalse;\n"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">".NotRoom;\n"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"#Endif;\n"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"#Ifdef K2_thing;\n"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"@je cla K2_thing ?~NotObj;\n"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"@test_attr obj mark_as_thing ?rtrue;\n"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"@rfalse;\n"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"#Endif;\n"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">".NotObj;\n"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"\n"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"@je cla Object Class ?ObjOrClass;\n"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"@je cla Routine String ?RoutOrStr;\n"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"\n"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"@jin cla 1 ?~Mistake;\n"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"\n"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"@jz objflag ?rfalse;\n"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"@get_prop_addr obj 2 -&gt; a;\n"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"@jz a ?rfalse;\n"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"@get_prop_len a -&gt; n;\n"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"\n"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"@div n 2 -&gt; n;\n"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">".Loop;\n"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"@loadw a j -&gt; sp;\n"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"@je sp cla ?rtrue;\n"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"@inc j;\n"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"@jl j n ?Loop;\n"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"@rfalse;\n"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"\n"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">".ObjOrClass;\n"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"@jz objflag ?rfalse;\n"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"@je cla Object ?JustObj;\n"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"\n"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"! So now cla is Class\n"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"@jg obj String ?~rtrue;\n"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"@jin obj Class ?rtrue;\n"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"@rfalse;\n"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"\n"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">".JustObj;\n"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"! So now cla is Object\n"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"@jg obj String ?~rfalse;\n"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"@jin obj Class ?rfalse;\n"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"@rtrue;\n"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"\n"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">".RoutOrStr;\n"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"@jz objflag ?~rfalse;\n"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"@call_2s Z__Region obj -&gt; sp;\n"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"@inc sp;\n"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"@je sp cla ?rtrue;\n"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"@rfalse;\n"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"\n"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">".Mistake;\n"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"RT__Err(\"apply 'ofclass' for\", cla, -1);\n"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"rfalse;\n"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">OUTDENT</span><span class="plain-syntax">; </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"];\n"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"#Endif;\n"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"#Endif;\n"</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="2-cg.html#SP12" class="function-link"><span class="function-syntax">CodeGen::deselect</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="identifier-syntax">saved</span><span class="plain-syntax">);</span>
</pre>
<ul class="endnotetexts"><li>This code is used in <a href="4-fi6.html#SP4">&#167;4</a>.</li></ul>
<p class="commentary firstcommentary"><a id="SP5" class="paragraph-anchor"></a><b>&#167;5. </b>Pragmas are interpreted as ICL directives &mdash; ICL being the Inform
Configuration Language part of Inform 6, a mini-language for controlling the I6
compiler, able to set command-line switches, memory settings and so on. I6
ordinarily discards lines beginning with exclamation marks as comments, but at
the very top of the file, lines beginning <span class="extract"><span class="extract-syntax">!%</span></span> are read as ICL commands: as soon
as any line (including a blank line) doesn't have this signature, I6 exits ICL
mode.
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">I6Target::offer_pragma</span><button class="popup" onclick="togglePopup('usagePopup4')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup4">Usage of <span class="code-font"><span class="function-syntax">I6Target::offer_pragma</span></span>:<br/><a href="4-fi6.html#SP1">&#167;1</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">code_generator</span><span class="plain-syntax"> *</span><span class="identifier-syntax">gtr</span><span class="plain-syntax">, </span><span class="reserved-syntax">code_generation</span><span class="plain-syntax"> *</span><span class="identifier-syntax">gen</span><span class="plain-syntax">,</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">tag</span><span class="plain-syntax">, </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">content</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Str::eq</span><span class="plain-syntax">(</span><span class="identifier-syntax">tag</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"Inform6"</span><span class="plain-syntax">)) {</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">segmentation_pos</span><span class="plain-syntax"> </span><span class="identifier-syntax">saved</span><span class="plain-syntax"> = </span><a href="2-cg.html#SP12" class="function-link"><span class="function-syntax">CodeGen::select</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="constant-syntax">ICL_directives_I7CGS</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">OUT</span><span class="plain-syntax"> = </span><a href="2-cg.html#SP14" class="function-link"><span class="function-syntax">CodeGen::current</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"!%% %S\n"</span><span class="plain-syntax">, </span><span class="identifier-syntax">content</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="2-cg.html#SP12" class="function-link"><span class="function-syntax">CodeGen::deselect</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="identifier-syntax">saved</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> }</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP6" class="paragraph-anchor"></a><b>&#167;6. </b>Names are not mangled: all Inter identifiers are used as-is.
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">I6Target::mangle</span><button class="popup" onclick="togglePopup('usagePopup5')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup5">Usage of <span class="code-font"><span class="function-syntax">I6Target::mangle</span></span>:<br/><a href="4-fi6.html#SP1">&#167;1</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">code_generator</span><span class="plain-syntax"> *</span><span class="identifier-syntax">gtr</span><span class="plain-syntax">, </span><span class="identifier-syntax">OUTPUT_STREAM</span><span class="plain-syntax">, </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">identifier</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"%S"</span><span class="plain-syntax">, </span><span class="identifier-syntax">identifier</span><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP7" class="paragraph-anchor"></a><b>&#167;7. </b>The end:
</p>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">I6Target::end_generation</span><button class="popup" onclick="togglePopup('usagePopup6')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup6">Usage of <span class="code-font"><span class="function-syntax">I6Target::end_generation</span></span>:<br/><a href="4-fi6.html#SP1">&#167;1</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">code_generator</span><span class="plain-syntax"> *</span><span class="identifier-syntax">gtr</span><span class="plain-syntax">, </span><span class="reserved-syntax">code_generation</span><span class="plain-syntax"> *</span><span class="identifier-syntax">gen</span><span class="plain-syntax">) {</span>
<span class="plain-syntax"> </span><a href="4-i6o.html#SP13" class="function-link"><span class="function-syntax">I6TargetObjects::end_generation</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gtr</span><span class="plain-syntax">, </span><span class="identifier-syntax">gen</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><a href="4-i6c2.html#SP9" class="function-link"><span class="function-syntax">I6TargetCode::end_generation</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gtr</span><span class="plain-syntax">, </span><span class="identifier-syntax">gen</span><span class="plain-syntax">);</span>
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
</pre>
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