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<!--Weave of 'Jump Labels' generated by Inweb-->
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<ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="../inform7n.html">Inform7</a></li><li><a href="index.html">imperative</a></li><li><a href="index.html#3">Chapter 3: Functions</a></li><li><b>Jump Labels</b></li></ul></div>
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<p class="purpose">Generating numbered families of identifier names to use as jump labels, and creating any associated array storage needed.</p>
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<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>§1. </b>At the risk of angering the ghost of Dijkstra, we compile plenty of <span class="extract"><span class="extract-syntax">JUMP_BIP</span></span>
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opcodes in the Inter functions we make, and these require labels to jump to.
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Clearly we could just call these <span class="extract"><span class="extract-syntax">L0</span></span>, <span class="extract"><span class="extract-syntax">L1</span></span>, <span class="extract"><span class="extract-syntax">L2</span></span>, ..., <span class="extract"><span class="extract-syntax">L3475</span></span>, ..., but that
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would make the Inter code we're generating harder for human eyes to read. So we
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will go to a little trouble to give meaningful names.
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</p>
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<p class="commentary">In particular, labels are generated within "namespaces", which are really just
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numbered sets, except that they can also have associated storage,<sup id="fnref:1"><a href="#fn:1" rel="footnote">1</a></sup> which is
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global and persistent:
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</p>
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<ul class="footnotetexts"><li class="footnote" id="fn:1"><p class="inwebfootnote"><sup id="fnref:1"><a href="#fn:1" rel="footnote">1</a></sup> Labels and storage are not obviously related, but in fact these small pieces
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of storage are used in "say" phrases to choose alternative wordings, where the
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options correspond to labels to jump to.
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<a href="#fnref:1" title="return to text"> ↩</a></p></li></ul>
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<pre class="displayed-code all-displayed-code code-font">
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<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">label_namespace</span><span class="plain-syntax"> {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">label_prefix</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">label_counter</span><span class="plain-syntax">; </span><span class="comment-syntax"> next free ID number for this label namespace</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">allocate_storage</span><span class="plain-syntax">; </span><span class="comment-syntax"> number of words of memory to reserve for each label</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">inter_name</span><span class="plain-syntax"> *</span><span class="identifier-syntax">label_storage_iname</span><span class="plain-syntax">; </span><span class="comment-syntax"> where that storage is</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">storage_compiled</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">CLASS_DEFINITION</span>
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<span class="plain-syntax">} </span><span class="reserved-syntax">label_namespace</span><span class="plain-syntax">;</span>
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</pre>
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<ul class="endnotetexts"><li>The structure label_namespace is private to this section.</li></ul>
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<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>§2. </b>This function writes the current label identifier within the given namespace.
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This takes the form <span class="extract"><span class="extract-syntax">L_NameNumber</span></span>. For instance, <span class="extract"><span class="extract-syntax">L_Marble17</span></span> is the 18th label
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in namespace <span class="extract"><span class="extract-syntax">Marble</span></span>.
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</p>
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<p class="commentary">It is legal for a namespace's name to be the empty text, which generates labels
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<span class="extract"><span class="extract-syntax">L_0</span></span>, <span class="extract"><span class="extract-syntax">L_1</span></span>, ...
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">JumpLabels::write</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">JumpLabels::write</span></span>:<br/>Compile Blocks and Lines - <a href="5-cbal.html#SP4_5_3">§4.5.3</a><br/>Compile Invocations Inline - <a href="5-cii.html#SP6_5_1">§6.5.1</a></span></button><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">namespace</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">label_namespace</span><span class="plain-syntax"> *</span><span class="identifier-syntax">lns</span><span class="plain-syntax"> = </span><a href="3-jl.html#SP3" class="function-link"><span class="function-syntax">JumpLabels::obtain_namespace</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">namespace</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"L_%S%d"</span><span class="plain-syntax">, </span><span class="identifier-syntax">lns</span><span class="plain-syntax">-></span><span class="element-syntax">label_prefix</span><span class="plain-syntax">, </span><span class="identifier-syntax">lns</span><span class="plain-syntax">-></span><span class="element-syntax">label_counter</span><span class="plain-syntax">);</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP3" class="paragraph-anchor"></a><b>§3. </b>The rest of Inform tends not to store pointers to namespaces: instead it
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must indicate them by their textual prefixes. This is very slightly inefficient,
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but there are very few namespaces in any single function.
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</p>
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<p class="commentary">However, the namespace <span class="extract"><span class="extract-syntax">Whatever</span></span> is different for different functions — jump
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labels, after all, are private to functions. <span class="extract"><span class="extract-syntax">JumpLabels::obtain_namespace(I"Whatever")</span></span>
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will return the namespace for whatever we are currently compiling.
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</p>
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<p class="commentary">This leads to an interesting nuance, which is that functions which are instantiations
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of templates will share a common list. (See <a href="3-fnc.html#SP4" class="internal">Functions::current_label_namespaces</a>.)
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That means that they share their storage, if they have any. For example, label
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storage is used to manage the alternate texts in the following:
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="identifier-syntax">To</span><span class="plain-syntax"> </span><span class="identifier-syntax">judge</span><span class="plain-syntax"> (</span><span class="identifier-syntax">V</span><span class="plain-syntax"> - </span><span class="identifier-syntax">value</span><span class="plain-syntax">):</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">say</span><span class="plain-syntax"> </span><span class="string-syntax">"[V] is [one of]clearly[or]evidently[or]markedly[cycling] just plain [V]."</span>
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<span class="identifier-syntax">When</span><span class="plain-syntax"> </span><span class="identifier-syntax">play</span><span class="plain-syntax"> </span><span class="identifier-syntax">begins</span><span class="plain-syntax">:</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">judge</span><span class="plain-syntax"> </span><span class="constant-syntax">21</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">judge</span><span class="plain-syntax"> </span><span class="string-syntax">"fishslice"</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">judge</span><span class="plain-syntax"> </span><span class="identifier-syntax">the</span><span class="plain-syntax"> </span><span class="identifier-syntax">time</span><span class="plain-syntax"> </span><span class="identifier-syntax">of</span><span class="plain-syntax"> </span><span class="identifier-syntax">day</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">judge</span><span class="plain-syntax"> </span><span class="identifier-syntax">true</span><span class="plain-syntax">.</span>
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</pre>
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<p class="commentary">Here "to judge" is instantiated four times (for when <span class="extract"><span class="extract-syntax">V</span></span> is a number, when it
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is a text, when it is a time of day, and when it is a truth state). The output
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here should be:
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="plain-syntax">21 is clearly just plain 21.</span>
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<span class="plain-syntax">fishslice is evidently just plain fishslice.</span>
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<span class="plain-syntax">9:00 am is markedly just plain 9:00 am.</span>
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<span class="plain-syntax">true is clearly just plain true.</span>
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<span class="plain-syntax">56 is evidently just plain 56.</span>
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</pre>
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<p class="commentary">In other words, the counter used in all four instance functions must be the
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same one; if they had all had independent counters, the result would be:
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="plain-syntax">21 is clearly just plain 21.</span>
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<span class="plain-syntax">fishslice is clearly just plain fishslice.</span>
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<span class="plain-syntax">9:00 am is clearly just plain 9:00 am.</span>
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<span class="plain-syntax">true is clearly just plain true.</span>
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<span class="plain-syntax">56 is evidently just plain 56.</span>
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</pre>
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<p class="commentary">See the test case <span class="extract"><span class="extract-syntax">InstantiatedLabelStorage</span></span>.
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</p>
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<pre class="definitions code-font"><span class="definition-keyword">define</span> <span class="constant-syntax">MAX_NAMESPACE_PREFIX_LENGTH</span><span class="plain-syntax"> </span><span class="constant-syntax">20</span><span class="plain-syntax"> </span><span class="comment-syntax"> when </span><span class="extract"><span class="extract-syntax">L_</span></span><span class="comment-syntax"> and a number are added, we are within 31 chars</span>
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</pre>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">label_namespace</span><span class="plain-syntax"> *</span><span class="function-syntax">JumpLabels::obtain_namespace</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">JumpLabels::obtain_namespace</span></span>:<br/><a href="3-jl.html#SP2">§2</a>, <a href="3-jl.html#SP5">§5</a>, <a href="3-jl.html#SP6">§6</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">name</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">linked_list</span><span class="plain-syntax"> *</span><span class="identifier-syntax">namespaces</span><span class="plain-syntax"> = </span><a href="3-fnc.html#SP4" class="function-link"><span class="function-syntax">Functions::current_label_namespaces</span></a><span class="plain-syntax">();</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">namespaces</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"labels are available only within functions"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">label_namespace</span><span class="plain-syntax"> *</span><span class="identifier-syntax">lns</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">LOOP_OVER_LINKED_LIST</span><span class="plain-syntax">(</span><span class="identifier-syntax">lns</span><span class="plain-syntax">, </span><span class="reserved-syntax">label_namespace</span><span class="plain-syntax">, </span><span class="identifier-syntax">namespaces</span><span class="plain-syntax">)</span>
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<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">name</span><span class="plain-syntax">, </span><span class="identifier-syntax">lns</span><span class="plain-syntax">-></span><span class="element-syntax">label_prefix</span><span class="plain-syntax">))</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">lns</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Str::len</span><span class="plain-syntax">(</span><span class="identifier-syntax">name</span><span class="plain-syntax">) > </span><span class="constant-syntax">MAX_NAMESPACE_PREFIX_LENGTH</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">StandardProblems::sentence_problem</span><span class="plain-syntax">(</span><span class="identifier-syntax">Task::syntax_tree</span><span class="plain-syntax">(),</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">PM_LabelNamespaceTooLong</span><span class="plain-syntax">),</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"a label namespace prefix is too long"</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"and should be shortened to a few alphabetic characters."</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Str::truncate</span><span class="plain-syntax">(</span><span class="identifier-syntax">name</span><span class="plain-syntax">, </span><span class="constant-syntax">MAX_NAMESPACE_PREFIX_LENGTH</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> }</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">lns</span><span class="plain-syntax"> = </span><span class="identifier-syntax">CREATE</span><span class="plain-syntax">(</span><span class="reserved-syntax">label_namespace</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">lns</span><span class="plain-syntax">-></span><span class="element-syntax">label_prefix</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Str::duplicate</span><span class="plain-syntax">(</span><span class="identifier-syntax">name</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">lns</span><span class="plain-syntax">-></span><span class="element-syntax">label_storage_iname</span><span class="plain-syntax"> =</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Enclosures::new_iname</span><span class="plain-syntax">(</span><span class="identifier-syntax">LABEL_STORAGES_HAP</span><span class="plain-syntax">, </span><span class="identifier-syntax">LABEL_ASSOCIATED_STORAGE_HL</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">lns</span><span class="plain-syntax">-></span><span class="element-syntax">label_counter</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">lns</span><span class="plain-syntax">-></span><span class="element-syntax">allocate_storage</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">lns</span><span class="plain-syntax">-></span><span class="element-syntax">storage_compiled</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">ADD_TO_LINKED_LIST</span><span class="plain-syntax">(</span><span class="identifier-syntax">lns</span><span class="plain-syntax">, </span><span class="reserved-syntax">label_namespace</span><span class="plain-syntax">, </span><span class="identifier-syntax">namespaces</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">lns</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP4" class="paragraph-anchor"></a><b>§4. </b>Though multiple instantiations of the same imperative definition may share
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a namespace list, we need to reset all the counters each time it is instantiated:
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">JumpLabels::restart_counters</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">JumpLabels::restart_counters</span></span>:<br/>Functions - <a href="3-fnc.html#SP5">§5</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">id_body</span><span class="plain-syntax"> *</span><span class="identifier-syntax">idb</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">label_namespace</span><span class="plain-syntax"> *</span><span class="identifier-syntax">lns</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">LOOP_OVER_LINKED_LIST</span><span class="plain-syntax">(</span><span class="identifier-syntax">lns</span><span class="plain-syntax">, </span><span class="reserved-syntax">label_namespace</span><span class="plain-syntax">, </span><span class="identifier-syntax">idb</span><span class="plain-syntax">-></span><span class="identifier-syntax">compilation_data</span><span class="plain-syntax">.</span><span class="element-syntax">label_namespaces</span><span class="plain-syntax">)</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">lns</span><span class="plain-syntax">-></span><span class="element-syntax">label_counter</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP5" class="paragraph-anchor"></a><b>§5. </b>An individual counter can be read, advanced or retreated with:
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">JumpLabels::read_counter</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">JumpLabels::read_counter</span></span>:<br/>Compile Blocks and Lines - <a href="5-cbal.html#SP4_5_3">§4.5.3</a><br/>Compile Invocations Inline - <a href="5-cii.html#SP6_5_2">§6.5.2</a>, <a href="5-cii.html#SP6_5_4">§6.5.4</a>, <a href="5-cii.html#SP6_5_5">§6.5.5</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">namespace</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">advance_by</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">label_namespace</span><span class="plain-syntax"> *</span><span class="identifier-syntax">lns</span><span class="plain-syntax"> = </span><a href="3-jl.html#SP3" class="function-link"><span class="function-syntax">JumpLabels::obtain_namespace</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">namespace</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">c</span><span class="plain-syntax"> = </span><span class="identifier-syntax">lns</span><span class="plain-syntax">-></span><span class="element-syntax">label_counter</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">lns</span><span class="plain-syntax">-></span><span class="element-syntax">label_counter</span><span class="plain-syntax"> += </span><span class="identifier-syntax">advance_by</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">lns</span><span class="plain-syntax">-></span><span class="element-syntax">label_counter</span><span class="plain-syntax"> < </span><span class="constant-syntax">0</span><span class="plain-syntax">) </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"label counter negative"</span><span class="plain-syntax">);</span>
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|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">c</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP6" class="paragraph-anchor"></a><b>§6. </b>So, then, we can mark a namespace as requiring 1 or more words of storage.
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This will accumulate into an array, as follows.
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|
</p>
|
|
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<pre class="displayed-code all-displayed-code code-font">
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|
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">JumpLabels::allocate_storage</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">JumpLabels::allocate_storage</span></span>:<br/>Compile Invocations Inline - <a href="5-cii.html#SP6_5_6">§6.5.6</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">namespace</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">multiplier</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">label_namespace</span><span class="plain-syntax"> *</span><span class="identifier-syntax">lns</span><span class="plain-syntax"> = </span><a href="3-jl.html#SP3" class="function-link"><span class="function-syntax">JumpLabels::obtain_namespace</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">namespace</span><span class="plain-syntax">);</span>
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|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">multiplier</span><span class="plain-syntax"> > </span><span class="identifier-syntax">lns</span><span class="plain-syntax">-></span><span class="element-syntax">allocate_storage</span><span class="plain-syntax">) </span><span class="identifier-syntax">lns</span><span class="plain-syntax">-></span><span class="element-syntax">allocate_storage</span><span class="plain-syntax"> = </span><span class="identifier-syntax">multiplier</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
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|
<span class="identifier-syntax">inter_name</span><span class="plain-syntax"> *</span><span class="function-syntax">JumpLabels::storage_iname</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">JumpLabels::storage_iname</span></span>:<br/>Compile Invocations Inline - <a href="5-cii.html#SP6_5_3">§6.5.3</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">namespace</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">label_namespace</span><span class="plain-syntax"> *</span><span class="identifier-syntax">lns</span><span class="plain-syntax"> = </span><a href="3-jl.html#SP3" class="function-link"><span class="function-syntax">JumpLabels::obtain_namespace</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">namespace</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">lns</span><span class="plain-syntax">-></span><span class="element-syntax">label_storage_iname</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP7" class="paragraph-anchor"></a><b>§7. </b>When a function body is completed, this is then called to create the necessary
|
|
storage space, if any:
|
|
</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">JumpLabels::compile_necessary_storage</span><button class="popup" onclick="togglePopup('usagePopup7')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup7">Usage of <span class="code-font"><span class="function-syntax">JumpLabels::compile_necessary_storage</span></span>:<br/>Functions - <a href="3-fnc.html#SP6">§6</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="identifier-syntax">linked_list</span><span class="plain-syntax"> *</span><span class="identifier-syntax">namespaces</span><span class="plain-syntax"> = </span><a href="3-fnc.html#SP4" class="function-link"><span class="function-syntax">Functions::current_label_namespaces</span></a><span class="plain-syntax">();</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">label_namespace</span><span class="plain-syntax"> *</span><span class="identifier-syntax">lns</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">LOOP_OVER_LINKED_LIST</span><span class="plain-syntax">(</span><span class="identifier-syntax">lns</span><span class="plain-syntax">, </span><span class="reserved-syntax">label_namespace</span><span class="plain-syntax">, </span><span class="identifier-syntax">namespaces</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">lns</span><span class="plain-syntax">-></span><span class="element-syntax">storage_compiled</span><span class="plain-syntax"> == </span><span class="identifier-syntax">FALSE</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">N</span><span class="plain-syntax"> = (</span><span class="identifier-syntax">lns</span><span class="plain-syntax">-></span><span class="element-syntax">allocate_storage</span><span class="plain-syntax">)*(</span><span class="identifier-syntax">lns</span><span class="plain-syntax">-></span><span class="element-syntax">label_counter</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">N</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">packaging_state</span><span class="plain-syntax"> </span><span class="identifier-syntax">save</span><span class="plain-syntax"> =</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">EmitArrays::begin_word</span><span class="plain-syntax">(</span><span class="identifier-syntax">lns</span><span class="plain-syntax">-></span><span class="element-syntax">label_storage_iname</span><span class="plain-syntax">, </span><span class="identifier-syntax">K_value</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">i</span><span class="plain-syntax">=0; </span><span class="identifier-syntax">i</span><span class="plain-syntax"><</span><span class="identifier-syntax">N</span><span class="plain-syntax">; </span><span class="identifier-syntax">i</span><span class="plain-syntax">++) </span><span class="identifier-syntax">EmitArrays::numeric_entry</span><span class="plain-syntax">(0);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">N</span><span class="plain-syntax"> == </span><span class="constant-syntax">1</span><span class="plain-syntax">) </span><span class="identifier-syntax">EmitArrays::numeric_entry</span><span class="plain-syntax">(0);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">EmitArrays::end</span><span class="plain-syntax">(</span><span class="identifier-syntax">save</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">lns</span><span class="plain-syntax">-></span><span class="element-syntax">storage_compiled</span><span class="plain-syntax"> = </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
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|
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