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<!--Weave of 'The Nop Construct' generated by Inweb-->
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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">bytecode</a></li><li><a href="index.html#4">Chapter 4: Void Constructs</a></li><li><b>The Nop Construct</b></li></ul></div>
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<p class="purpose">Defining the nop construct.</p>
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<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>§1. </b></p>
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<pre class="definitions code-font"><span class="definition-keyword">enum</span> <span class="constant-syntax">NOP_IST</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">void</span><span class="plain-syntax"> </span><span class="function-syntax">Inter::Nop::define</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">Inter::Nop::define</span></span>:<br/>Definition - <a href="3-dfn.html#SP3">§3</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">void</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">inter_construct</span><span class="plain-syntax"> *</span><span class="identifier-syntax">IC</span><span class="plain-syntax"> = </span><a href="3-dfn.html#SP1" class="function-link"><span class="function-syntax">Inter::Defn::create_construct</span></a><span class="plain-syntax">(</span>
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<span class="plain-syntax"> </span><span class="constant-syntax">NOP_IST</span><span class="plain-syntax">, </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">I</span><span class="string-syntax">"nop"</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"nops"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">IC</span><span class="plain-syntax">-></span><span class="element-syntax">usage_permissions</span><span class="plain-syntax"> = </span><span class="constant-syntax">OUTSIDE_OF_PACKAGES</span><span class="plain-syntax"> + </span><span class="constant-syntax">INSIDE_PLAIN_PACKAGE</span><span class="plain-syntax"> + </span><span class="constant-syntax">INSIDE_CODE_PACKAGE</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">METHOD_ADD</span><span class="plain-syntax">(</span><span class="identifier-syntax">IC</span><span class="plain-syntax">, </span><span class="constant-syntax">CONSTRUCT_WRITE_MTID</span><span class="plain-syntax">, </span><a href="4-tnc.html#SP2" class="function-link"><span class="function-syntax">Inter::Nop::write</span></a><span class="plain-syntax">);</span>
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<span class="plain-syntax">}</span>
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<span class="reserved-syntax">inter_error_message</span><span class="plain-syntax"> *</span><span class="function-syntax">Inter::Nop::new</span><span class="plain-syntax">(</span><span class="reserved-syntax">inter_bookmark</span><span class="plain-syntax"> *</span><span class="identifier-syntax">IBM</span><span class="plain-syntax">, </span><span class="constant-syntax">inter_ti</span><span class="plain-syntax"> </span><span class="identifier-syntax">level</span><span class="plain-syntax">, </span><span class="reserved-syntax">inter_error_location</span><span class="plain-syntax"> *</span><span class="identifier-syntax">eloc</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">P</span><span class="plain-syntax"> = </span><a href="2-in.html#SP4" class="function-link"><span class="function-syntax">Inode::fill_0</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">IBM</span><span class="plain-syntax">, </span><span class="constant-syntax">NOP_IST</span><span class="plain-syntax">, </span><span class="identifier-syntax">eloc</span><span class="plain-syntax">, </span><span class="identifier-syntax">level</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">inter_error_message</span><span class="plain-syntax"> *</span><span class="identifier-syntax">E</span><span class="plain-syntax"> = </span><a href="3-dfn.html#SP4" class="function-link"><span class="function-syntax">Inter::Defn::verify_construct</span></a><span class="plain-syntax">(</span><a href="2-bkm.html#SP1" class="function-link"><span class="function-syntax">Inter::Bookmarks::package</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">IBM</span><span class="plain-syntax">), </span><span class="identifier-syntax">P</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">E</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">E</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><a href="2-bkm.html#SP1" class="function-link"><span class="function-syntax">Inter::Bookmarks::insert</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">IBM</span><span class="plain-syntax">, </span><span class="identifier-syntax">P</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">NULL</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="SP2" class="paragraph-anchor"></a><b>§2. </b>This in fact prints only in a stack backtrace, not in regular textual output,
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where any nop statements are simply ignored.
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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">Inter::Nop::write</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">Inter::Nop::write</span></span>:<br/><a href="4-tnc.html#SP1">§1</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inter_construct</span><span class="plain-syntax"> *</span><span class="identifier-syntax">IC</span><span class="plain-syntax">, </span><span class="identifier-syntax">OUTPUT_STREAM</span><span class="plain-syntax">, </span><span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="reserved-syntax">inter_error_message</span><span class="plain-syntax"> **</span><span class="identifier-syntax">E</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">"nop"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax">}</span>
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