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<!--Weave of 'Vanilla Code' generated by Inweb-->
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<div class="breadcrumbs">
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<ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="../intern.html">Inter Modules</a></li><li><a href="index.html">final</a></li><li><a href="index.html#2">Chapter 2: Mechanism</a></li><li><b>Vanilla Code</b></li></ul></div>
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<p class="purpose">How the vanilla code generation strategy handles the actual code inside functions.</p>
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<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>§1. </b>The subtrees of Inter inside function bodies are pretty simple. There are
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some structural nodes, breaking up code-blocks and the like: and these we
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simply recurse down through, except that in the case of <span class="extract"><span class="extract-syntax">code</span></span> we keep track
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of the "void level". This is the level in the hierarchy where evaluation is
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in a void context. For example,
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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"> code</span>
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<span class="plain-syntax"> inv !printnumber</span>
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<span class="plain-syntax"> inv !plus</span>
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<span class="plain-syntax"> val K_number 12</span>
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<span class="plain-syntax"> val K_number 2</span>
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<span class="plain-syntax"> ^</span>
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<span class="plain-syntax"> |</span>
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<span class="plain-syntax"> void level</span>
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</pre>
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<p class="commentary">here the invocation of <span class="extract"><span class="extract-syntax">!printnumber</span></span> is in a void context (i.e., any value
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produced is discarded), whereas the invocation of <span class="extract"><span class="extract-syntax">!plus</span></span> is not.
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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">VanillaCode::code</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">VanillaCode::code</span></span>:<br/>Vanilla - <a href="2-vnl.html#SP3">§3</a></span></button><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="identifier-syntax">inter_tree_node</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">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">old_level</span><span class="plain-syntax"> = </span><span class="identifier-syntax">gen</span><span class="plain-syntax">-></span><span class="element-syntax">void_level</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">gen</span><span class="plain-syntax">-></span><span class="element-syntax">void_level</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Inode::get_level</span><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">) + </span><span class="constant-syntax">1</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="constant-syntax">VNODE_ALLC</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">gen</span><span class="plain-syntax">-></span><span class="element-syntax">void_level</span><span class="plain-syntax"> = </span><span class="identifier-syntax">old_level</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">VanillaCode::evaluation</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">VanillaCode::evaluation</span></span>:<br/>Vanilla - <a href="2-vnl.html#SP3">§3</a></span></button><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="identifier-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">P</span><span class="plain-syntax">) { </span><span class="constant-syntax">VNODE_ALLC</span><span class="plain-syntax">; }</span>
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">VanillaCode::reference</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">VanillaCode::reference</span></span>:<br/>Vanilla - <a href="2-vnl.html#SP3">§3</a></span></button><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="identifier-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">P</span><span class="plain-syntax">) { </span><span class="constant-syntax">VNODE_ALLC</span><span class="plain-syntax">; }</span>
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">VanillaCode::cast</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">VanillaCode::cast</span></span>:<br/>Vanilla - <a href="2-vnl.html#SP3">§3</a></span></button><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="identifier-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">P</span><span class="plain-syntax">) { </span><span class="constant-syntax">VNODE_ALLC</span><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>As with assembly language, Inter can contain positional markers called labels.
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These we offer to the generator to deal with as it likes:
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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">VanillaCode::label</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">VanillaCode::label</span></span>:<br/>Vanilla - <a href="2-vnl.html#SP3">§3</a></span></button><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="identifier-syntax">inter_tree_node</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="identifier-syntax">inter_symbol</span><span class="plain-syntax"> *</span><span class="identifier-syntax">lab_name</span><span class="plain-syntax"> = </span><span class="identifier-syntax">LabelInstruction::label_symbol</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><a href="2-cg2.html#SP13" class="function-link"><span class="function-syntax">Generators::place_label</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="identifier-syntax">InterSymbol::identifier</span><span class="plain-syntax">(</span><span class="identifier-syntax">lab_name</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>There are three ways to perform an invocation. One of the three, assembly
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language, can only in fact occur in void context, but we won't assume that here.
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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_OPERANDS_IN_INTER_ASSEMBLY</span><span class="plain-syntax"> </span><span class="constant-syntax">32</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">VanillaCode::inv</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">VanillaCode::inv</span></span>:<br/>Vanilla - <a href="2-vnl.html#SP3">§3</a></span></button><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="identifier-syntax">inter_tree_node</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">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">void_context</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="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Inode::get_level</span><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">) == </span><span class="identifier-syntax">gen</span><span class="plain-syntax">-></span><span class="element-syntax">void_level</span><span class="plain-syntax">) </span><span class="identifier-syntax">void_context</span><span class="plain-syntax"> = </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">switch</span><span class="plain-syntax"> (</span><span class="identifier-syntax">InvInstruction::method</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">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">PRIMITIVE_INVMETH:</span><span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="2-vc2.html#SP3_1" class="named-paragraph-link"><span class="named-paragraph">Invoke a primitive</span><span class="named-paragraph-number">3.1</span></a></span><span class="plain-syntax">; </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">FUNCTION_INVMETH:</span><span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="2-vc2.html#SP3_2" class="named-paragraph-link"><span class="named-paragraph">Invoke a function</span><span class="named-paragraph-number">3.2</span></a></span><span class="plain-syntax">; </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">case</span><span class="plain-syntax"> </span><span class="identifier-syntax">OPCODE_INVMETH:</span><span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="2-vc2.html#SP3_3" class="named-paragraph-link"><span class="named-paragraph">Invoke an assembly-language opcode</span><span class="named-paragraph-number">3.3</span></a></span><span class="plain-syntax">; </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">default:</span><span class="plain-syntax"> </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"unknown invocation method"</span><span class="plain-syntax">);</span>
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<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_1" class="paragraph-anchor"></a><b>§3.1. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Invoke a primitive</span><span class="named-paragraph-number">3.1</span></span><span class="comment-syntax"> =</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="plain-syntax"> </span><span class="identifier-syntax">inter_symbol</span><span class="plain-syntax"> *</span><span class="identifier-syntax">primitive_s</span><span class="plain-syntax"> = </span><span class="identifier-syntax">InvInstruction::primitive</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">primitive_s</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">"no primitive"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><a href="2-cg2.html#SP14" class="function-link"><span class="function-syntax">Generators::invoke_primitive</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="identifier-syntax">primitive_s</span><span class="plain-syntax">, </span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="identifier-syntax">void_context</span><span class="plain-syntax">);</span>
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</pre>
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<ul class="endnotetexts"><li>This code is used in <a href="2-vc2.html#SP3">§3</a>.</li></ul>
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<p class="commentary firstcommentary"><a id="SP3_2" class="paragraph-anchor"></a><b>§3.2. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Invoke a function</span><span class="named-paragraph-number">3.2</span></span><span class="comment-syntax"> =</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="plain-syntax"> </span><span class="identifier-syntax">inter_symbol</span><span class="plain-syntax"> *</span><span class="identifier-syntax">function_s</span><span class="plain-syntax"> = </span><span class="identifier-syntax">InvInstruction::function</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">function_s</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">"no function"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><a href="2-vf.html#SP9" class="function-link"><span class="function-syntax">VanillaFunctions::invoke_function</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="identifier-syntax">function_s</span><span class="plain-syntax">, </span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="identifier-syntax">void_context</span><span class="plain-syntax">);</span>
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</pre>
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<ul class="endnotetexts"><li>This code is used in <a href="2-vc2.html#SP3">§3</a>.</li></ul>
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<p class="commentary firstcommentary"><a id="SP3_3" class="paragraph-anchor"></a><b>§3.3. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Invoke an assembly-language opcode</span><span class="named-paragraph-number">3.3</span></span><span class="comment-syntax"> =</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="plain-syntax"> </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">opcode_name</span><span class="plain-syntax"> = </span><span class="identifier-syntax">InvInstruction::opcode</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="identifier-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">operands</span><span class="plain-syntax">[</span><span class="constant-syntax">MAX_OPERANDS_IN_INTER_ASSEMBLY</span><span class="plain-syntax">], *</span><span class="identifier-syntax">label</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="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">operand_count</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="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">label_sense</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NOT_APPLICABLE</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="2-vc2.html#SP3_3_1" class="named-paragraph-link"><span class="named-paragraph">Scan the operands</span><span class="named-paragraph-number">3.3.1</span></a></span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><a href="2-cg2.html#SP14" class="function-link"><span class="function-syntax">Generators::invoke_opcode</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="identifier-syntax">opcode_name</span><span class="plain-syntax">, </span><span class="identifier-syntax">operand_count</span><span class="plain-syntax">, </span><span class="identifier-syntax">operands</span><span class="plain-syntax">, </span><span class="identifier-syntax">label</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">label_sense</span><span class="plain-syntax">);</span>
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</pre>
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<ul class="endnotetexts"><li>This code is used in <a href="2-vc2.html#SP3">§3</a>.</li></ul>
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<p class="commentary firstcommentary"><a id="SP3_3_1" class="paragraph-anchor"></a><b>§3.3.1. </b>Unusually, opcode invocations do not work by recursing down through the tree
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to pick up the operands implicitly: instead we gather them into a small array.
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This is because of the slightly clumsy way in which labels are represented in
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Inter assembly, which we want to take care of here, so that generators don't
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need to.
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</p>
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<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Scan the operands</span><span class="named-paragraph-number">3.3.1</span></span><span class="comment-syntax"> =</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="plain-syntax"> </span><span class="identifier-syntax">LOOP_THROUGH_INTER_CHILDREN</span><span class="plain-syntax">(</span><span class="identifier-syntax">F</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">Inode::is</span><span class="plain-syntax">(</span><span class="identifier-syntax">F</span><span class="plain-syntax">, </span><span class="identifier-syntax">ASSEMBLY_IST</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">AssemblyInstruction::which_marker</span><span class="plain-syntax">(</span><span class="identifier-syntax">F</span><span class="plain-syntax">) == </span><span class="identifier-syntax">ASM_NEG_ASMMARKER</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">label_sense</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="reserved-syntax">continue</span><span class="plain-syntax">;</span>
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<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="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Inode::is</span><span class="plain-syntax">(</span><span class="identifier-syntax">F</span><span class="plain-syntax">, </span><span class="identifier-syntax">LAB_IST</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">label_sense</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NOT_APPLICABLE</span><span class="plain-syntax">) </span><span class="identifier-syntax">label_sense</span><span class="plain-syntax"> = </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">label</span><span class="plain-syntax"> = </span><span class="identifier-syntax">F</span><span class="plain-syntax">; </span><span class="reserved-syntax">continue</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="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">operand_count</span><span class="plain-syntax"> < </span><span class="constant-syntax">MAX_OPERANDS_IN_INTER_ASSEMBLY</span><span class="plain-syntax">)</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">operands</span><span class="plain-syntax">[</span><span class="identifier-syntax">operand_count</span><span class="plain-syntax">++] = </span><span class="identifier-syntax">F</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> }</span>
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</pre>
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<ul class="endnotetexts"><li>This code is used in <a href="2-vc2.html#SP3_3">§3.3</a>.</li></ul>
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<p class="commentary firstcommentary"><a id="SP4" class="paragraph-anchor"></a><b>§4. </b>If they are not further invocations or code blocks, for which see above, the
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nodes under an invocation will be <span class="extract"><span class="extract-syntax">val</span></span>, <span class="extract"><span class="extract-syntax">ref</span></span> or <span class="extract"><span class="extract-syntax">lab</span></span>.
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</p>
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<p class="commentary">A <span class="extract"><span class="extract-syntax">ref</span></span> can be to a variable; a <span class="extract"><span class="extract-syntax">val</span></span> can be to a named constant, a variable
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or a literal. The special <span class="extract"><span class="extract-syntax">self</span></span> symbol, which has no definition, counts as
|
|
a variable here.
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</p>
|
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|
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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">VanillaCode::val_or_ref</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">VanillaCode::val_or_ref</span></span>:<br/>Vanilla - <a href="2-vnl.html#SP3">§3</a></span></button><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="identifier-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">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">ref</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">inter_pair</span><span class="plain-syntax"> </span><span class="identifier-syntax">val</span><span class="plain-syntax"> = </span><span class="identifier-syntax">InterValuePairs::undef</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">Inode::is</span><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="identifier-syntax">VAL_IST</span><span class="plain-syntax">)) </span><span class="identifier-syntax">val</span><span class="plain-syntax"> = </span><span class="identifier-syntax">ValInstruction::value</span><span class="plain-syntax">(</span><span class="identifier-syntax">P</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">Inode::is</span><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="identifier-syntax">REF_IST</span><span class="plain-syntax">)) </span><span class="identifier-syntax">val</span><span class="plain-syntax"> = </span><span class="identifier-syntax">RefInstruction::value</span><span class="plain-syntax">(</span><span class="identifier-syntax">P</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">InterValuePairs::is_symbolic</span><span class="plain-syntax">(</span><span class="identifier-syntax">val</span><span class="plain-syntax">)) {</span>
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|
<span class="plain-syntax"> </span><span class="identifier-syntax">inter_symbol</span><span class="plain-syntax"> *</span><span class="identifier-syntax">named_s</span><span class="plain-syntax"> = </span><span class="identifier-syntax">InterValuePairs::to_symbol_at</span><span class="plain-syntax">(</span><span class="identifier-syntax">val</span><span class="plain-syntax">, </span><span class="identifier-syntax">P</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">InterSymbol::trans</span><span class="plain-syntax">(</span><span class="identifier-syntax">named_s</span><span class="plain-syntax">), </span><span class="identifier-syntax">I</span><span class="string-syntax">"self"</span><span class="plain-syntax">)) ||</span>
|
|
<span class="plain-syntax"> (</span><span class="identifier-syntax">Inode::is</span><span class="plain-syntax">(</span><span class="identifier-syntax">named_s</span><span class="plain-syntax">-></span><span class="identifier-syntax">definition</span><span class="plain-syntax">, </span><span class="identifier-syntax">VARIABLE_IST</span><span class="plain-syntax">))) {</span>
|
|
<span class="plain-syntax"> </span><a href="2-cg2.html#SP17" class="function-link"><span class="function-syntax">Generators::evaluate_variable</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="identifier-syntax">named_s</span><span class="plain-syntax">, </span><span class="identifier-syntax">ref</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> {</span>
|
|
<span class="plain-syntax"> </span><a href="2-cg2.html#SP19" class="function-link"><span class="function-syntax">Generators::compile_literal_symbol</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="identifier-syntax">named_s</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">InterValuePairs::is_undef</span><span class="plain-syntax">(</span><span class="identifier-syntax">val</span><span class="plain-syntax">)) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"undef val/ref in Inter tree"</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> {</span>
|
|
<span class="plain-syntax"> </span><a href="2-cg.html#SP18" class="function-link"><span class="function-syntax">CodeGen::pair</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="identifier-syntax">val</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP5" class="paragraph-anchor"></a><b>§5. </b>A <span class="extract"><span class="extract-syntax">lab</span></span> works on a named label, which will be defined somewhere in the same
|
|
function body.
|
|
</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">VanillaCode::lab</span><button class="popup" onclick="togglePopup('usagePopup8')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup8">Usage of <span class="code-font"><span class="function-syntax">VanillaCode::lab</span></span>:<br/>Vanilla - <a href="2-vnl.html#SP3">§3</a></span></button><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="identifier-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">P</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">inter_symbol</span><span class="plain-syntax"> *</span><span class="identifier-syntax">label_s</span><span class="plain-syntax"> = </span><span class="identifier-syntax">LabInstruction::label_symbol</span><span class="plain-syntax">(</span><span class="identifier-syntax">P</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">label_s</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">"unknown label in lab in Inter tree"</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><a href="2-cg2.html#SP13" class="function-link"><span class="function-syntax">Generators::evaluate_label</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="identifier-syntax">InterSymbol::identifier</span><span class="plain-syntax">(</span><span class="identifier-syntax">label_s</span><span class="plain-syntax">));</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP6" class="paragraph-anchor"></a><b>§6. </b>An <span class="extract"><span class="extract-syntax">assembly</span></span> specifies one of a fixed number of special assembly-language
|
|
punctuation marks:
|
|
</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">VanillaCode::assembly</span><button class="popup" onclick="togglePopup('usagePopup9')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup9">Usage of <span class="code-font"><span class="function-syntax">VanillaCode::assembly</span></span>:<br/>Vanilla - <a href="2-vnl.html#SP3">§3</a></span></button><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="identifier-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">P</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">inter_ti</span><span class="plain-syntax"> </span><span class="identifier-syntax">which</span><span class="plain-syntax"> = </span><span class="identifier-syntax">AssemblyInstruction::which_marker</span><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><a href="2-cg2.html#SP14" class="function-link"><span class="function-syntax">Generators::assembly_marker</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="identifier-syntax">which</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
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