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<!--Weave of 'C Global Variables' 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="../compiler.html">Inter Modules</a></li><li><a href="index.html">final</a></li><li><a href="index.html#5">Chapter 5: C</a></li><li><b>C Global Variables</b></li></ul></div>
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<p class="purpose">Global variables translated to C.</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="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">CGlobals::initialise</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">CGlobals::initialise</span></span>:<br/>Final C - <a href="5-fnc.html#SP1">§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>
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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">gtr</span><span class="plain-syntax">, </span><span class="constant-syntax">DECLARE_VARIABLES_MTID</span><span class="plain-syntax">, </span><a href="5-cgv.html#SP3" class="function-link"><span class="function-syntax">CGlobals::declare_variables</span></a><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">gtr</span><span class="plain-syntax">, </span><span class="constant-syntax">EVALUATE_VARIABLE_MTID</span><span class="plain-syntax">, </span><a href="5-cgv.html#SP5" class="function-link"><span class="function-syntax">CGlobals::evaluate_variable</span></a><span class="plain-syntax">);</span>
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<span class="plain-syntax">}</span>
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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">C_generation_variables_data</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">no_variables</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">} </span><span class="reserved-syntax">C_generation_variables_data</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">CGlobals::initialise_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">CGlobals::initialise_data</span></span>:<br/>Final C - <a href="5-fnc.html#SP4">§4</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>
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<span class="plain-syntax"> </span><span class="identifier-syntax">C_GEN_DATA</span><span class="plain-syntax">(</span><span class="identifier-syntax">vardata</span><span class="plain-syntax">.</span><span class="element-syntax">no_variables</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>
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</pre>
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<ul class="endnotetexts"><li>The structure C_generation_variables_data 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>The basic scheme is this: the global Inter variables are going to have
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their values stored in an array, so to identify which variable you are reading
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or writing, you need an index (i.e., position) in that array.
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</p>
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<p class="commentary">The main thing we need to compile is a (static) array of initial values for
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these variables, so that a new process can be initialised. But we must also
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define constants to refer to their positions in the array.
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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">CGlobals::begin</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">CGlobals::begin</span></span>:<br/>Final C - <a href="5-fnc.html#SP5">§5</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>
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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">CGlobals::end</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">CGlobals::end</span></span>:<br/>Final C - <a href="5-fnc.html#SP6">§6</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>
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<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#SP10" 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">c_ids_and_maxima_I7CGS</span><span class="plain-syntax">);</span>
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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">OUT</span><span class="plain-syntax"> = </span><a href="2-cg.html#SP12" 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>
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<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"#define i7_no_variables %d\n"</span><span class="plain-syntax">, </span><span class="identifier-syntax">C_GEN_DATA</span><span class="plain-syntax">(</span><span class="identifier-syntax">vardata</span><span class="plain-syntax">.</span><span class="element-syntax">no_variables</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">"i7word_t i7_initial_variable_values[i7_no_variables];\n"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><a href="2-cg.html#SP10" 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>
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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>We will assign the global variables unique index numbers 0, 1, 2, ..., with
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the special variable <span class="extract"><span class="extract-syntax">self</span></span> given index 0. Note that <span class="extract"><span class="extract-syntax">self</span></span> always exists,
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but has no Inter declaration node.
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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">CGlobals::declare_variables</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">CGlobals::declare_variables</span></span>:<br/><a href="5-cgv.html#SP1">§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="identifier-syntax">linked_list</span><span class="plain-syntax"> *</span><span class="identifier-syntax">L</span><span class="plain-syntax">) {</span>
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<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#SP10" 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">c_globals_array_I7CGS</span><span class="plain-syntax">);</span>
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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">OUT</span><span class="plain-syntax"> = </span><a href="2-cg.html#SP12" 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>
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<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"i7word_t i7_initial_variable_values[i7_no_variables] = {\n"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="5-cgv.html#SP3_1" class="named-paragraph-link"><span class="named-paragraph">Define a constant for the self position in the globals array</span><span class="named-paragraph-number">3.1</span></a></span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="5-cgv.html#SP3_3" class="named-paragraph-link"><span class="named-paragraph">Add the initial value for self to the globals array</span><span class="named-paragraph-number">3.3</span></a></span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="5-cgv.html#SP3_5" class="named-paragraph-link"><span class="named-paragraph">Define a more legible constant for self to the header target</span><span class="named-paragraph-number">3.5</span></a></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">N</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="identifier-syntax">inter_symbol</span><span class="plain-syntax"> *</span><span class="identifier-syntax">var_name</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">var_name</span><span class="plain-syntax">, </span><span class="identifier-syntax">inter_symbol</span><span class="plain-syntax">, </span><span class="identifier-syntax">L</span><span class="plain-syntax">) {</span>
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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">identifier</span><span class="plain-syntax"> = </span><span class="identifier-syntax">InterSymbol::trans</span><span class="plain-syntax">(</span><span class="identifier-syntax">var_name</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="5-cgv.html#SP3_2" class="named-paragraph-link"><span class="named-paragraph">Define a constant for this position in the globals array</span><span class="named-paragraph-number">3.2</span></a></span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="5-cgv.html#SP3_4" class="named-paragraph-link"><span class="named-paragraph">Add the initial value to the globals array</span><span class="named-paragraph-number">3.4</span></a></span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="5-cgv.html#SP3_6" class="named-paragraph-link"><span class="named-paragraph">Define a more legible constant for the header target</span><span class="named-paragraph-number">3.6</span></a></span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">N</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">C_GEN_DATA</span><span class="plain-syntax">(</span><span class="identifier-syntax">vardata</span><span class="plain-syntax">.</span><span class="element-syntax">no_variables</span><span class="plain-syntax">) = </span><span class="identifier-syntax">N</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">"};\n"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><a href="2-cg.html#SP10" 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>
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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">Define a constant for the self position in the globals array</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="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#SP10" 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">c_ids_and_maxima_I7CGS</span><span class="plain-syntax">);</span>
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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">OUT</span><span class="plain-syntax"> = </span><a href="2-cg.html#SP12" 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>
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<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"#define "</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><a href="5-cnm.html#SP5" class="function-link"><span class="function-syntax">CNamespace::mangle_variable</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"self"</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">" 0\n"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><a href="2-cg.html#SP10" 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>
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</pre>
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<ul class="endnotetexts"><li>This code is used in <a href="5-cgv.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">Define a constant for this position in the globals array</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="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#SP10" 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">c_predeclarations_I7CGS</span><span class="plain-syntax">);</span>
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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">OUT</span><span class="plain-syntax"> = </span><a href="2-cg.html#SP12" 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>
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<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"#define "</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><a href="5-cnm.html#SP5" class="function-link"><span class="function-syntax">CNamespace::mangle_variable</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="identifier-syntax">identifier</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">" %d\n"</span><span class="plain-syntax">, </span><span class="identifier-syntax">N</span><span class="plain-syntax">);</span>
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|
<span class="plain-syntax"> </span><a href="2-cg.html#SP10" 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>
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|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="5-cgv.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">Add the initial value for self to the globals array</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="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#SP10" 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">c_globals_array_I7CGS</span><span class="plain-syntax">);</span>
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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">OUT</span><span class="plain-syntax"> = </span><a href="2-cg.html#SP12" 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>
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|
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">" 0 /* self */\n"</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::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>
|
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</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="5-cgv.html#SP3">§3</a>.</li></ul>
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<p class="commentary firstcommentary"><a id="SP3_4" class="paragraph-anchor"></a><b>§3.4. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Add the initial value to the globals array</span><span class="named-paragraph-number">3.4</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="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#SP10" 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">c_globals_array_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#SP12" 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>
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|
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">", "</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">var_name</span><span class="plain-syntax">-></span><span class="identifier-syntax">definition</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">var_name</span><span class="plain-syntax">-></span><span class="identifier-syntax">definition</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><a href="2-cg.html#SP16" 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">InterValuePairs::get</span><span class="plain-syntax">(</span><span class="identifier-syntax">P</span><span class="plain-syntax">, </span><span class="identifier-syntax">VAL1_VAR_IFLD</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><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"0"</span><span class="plain-syntax">);</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">identifier</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::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="5-cgv.html#SP3">§3</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP3_5" class="paragraph-anchor"></a><b>§3.5. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Define a more legible constant for self to the header target</span><span class="named-paragraph-number">3.5</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><a href="5-cgv.html#SP4" class="function-link"><span class="function-syntax">CGlobals::define_header_constant_for_variable</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</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="constant-syntax">0</span><span class="plain-syntax">);</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="5-cgv.html#SP3">§3</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP3_6" class="paragraph-anchor"></a><b>§3.6. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Define a more legible constant for the header target</span><span class="named-paragraph-number">3.6</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<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><span class="identifier-syntax">Metadata::optional_textual</span><span class="plain-syntax">(</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">InterPackage::container</span><span class="plain-syntax">(</span><span class="identifier-syntax">var_name</span><span class="plain-syntax">-></span><span class="identifier-syntax">definition</span><span class="plain-syntax">), </span><span class="identifier-syntax">I</span><span class="string-syntax">"^name"</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">name</span><span class="plain-syntax">)</span>
|
|
<span class="plain-syntax"> </span><a href="5-cgv.html#SP4" class="function-link"><span class="function-syntax">CGlobals::define_header_constant_for_variable</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="identifier-syntax">name</span><span class="plain-syntax">, </span><span class="identifier-syntax">N</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">else</span>
|
|
<span class="plain-syntax"> </span><a href="5-cgv.html#SP4" class="function-link"><span class="function-syntax">CGlobals::define_header_constant_for_variable</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="identifier-syntax">identifier</span><span class="plain-syntax">, </span><span class="identifier-syntax">N</span><span class="plain-syntax">);</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="5-cgv.html#SP3">§3</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP4" class="paragraph-anchor"></a><b>§4. </b></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">CGlobals::define_header_constant_for_variable</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">CGlobals::define_header_constant_for_variable</span></span>:<br/><a href="5-cgv.html#SP3_5">§3.5</a>, <a href="5-cgv.html#SP3_6">§3.6</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">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">var_name</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">id</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#SP10" 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">c_variable_symbols_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#SP12" 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">"#define %S %d\n"</span><span class="plain-syntax">, </span><a href="5-fnc.html#SP7" class="function-link"><span class="function-syntax">CTarget::symbols_header_identifier</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gen</span><span class="plain-syntax">, </span><span class="identifier-syntax">I</span><span class="string-syntax">"V"</span><span class="plain-syntax">, </span><span class="identifier-syntax">var_name</span><span class="plain-syntax">), </span><span class="identifier-syntax">id</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::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>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP5" class="paragraph-anchor"></a><b>§5. </b>Within a process <span class="extract"><span class="extract-syntax">proc</span></span>, the current value of variable <span class="extract"><span class="extract-syntax">i</span></span> is <span class="extract"><span class="extract-syntax">proc->state.variables[i]</span></span>.
|
|
</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">CGlobals::evaluate_variable</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">CGlobals::evaluate_variable</span></span>:<br/><a href="5-cgv.html#SP1">§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_symbol</span><span class="plain-syntax"> *</span><span class="identifier-syntax">var_name</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">as_reference</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#SP12" 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">"proc->state.variables["</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><a href="5-cnm.html#SP5" class="function-link"><span class="function-syntax">CNamespace::mangle_variable</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="identifier-syntax">InterSymbol::trans</span><span class="plain-syntax">(</span><span class="identifier-syntax">var_name</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">"]"</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>Finally, this function, part of the C library, initialises the variables for a
|
|
newly-starting process.
|
|
</p>
|
|
|
|
<pre class="Extracts-displayed-code all-displayed-code code-font">
|
|
<span class="Extracts-identifier-syntax">void</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_initialise_variables</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">i7process_t</span><span class="Extracts-plain-syntax"> *</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">);</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This is part of the extract file inform7_clib.h.</li></ul>
|
|
<pre class="Extracts-displayed-code all-displayed-code code-font">
|
|
<span class="Extracts-identifier-syntax">void</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i7_initialise_variables</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">i7process_t</span><span class="Extracts-plain-syntax"> *</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">) {</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">state</span><span class="Extracts-plain-syntax">.</span><span class="Extracts-identifier-syntax">variables</span><span class="Extracts-plain-syntax"> = </span><span class="Extracts-identifier-syntax">i7_calloc</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">, </span><span class="Extracts-identifier-syntax">i7_no_variables</span><span class="Extracts-plain-syntax">, </span><span class="Extracts-identifier-syntax">sizeof</span><span class="Extracts-plain-syntax">(</span><span class="Extracts-identifier-syntax">i7word_t</span><span class="Extracts-plain-syntax">));</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">for</span><span class="Extracts-plain-syntax"> (</span><span class="Extracts-identifier-syntax">int</span><span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">i</span><span class="Extracts-plain-syntax">=0; </span><span class="Extracts-identifier-syntax">i</span><span class="Extracts-plain-syntax"><</span><span class="Extracts-identifier-syntax">i7_no_variables</span><span class="Extracts-plain-syntax">; </span><span class="Extracts-identifier-syntax">i</span><span class="Extracts-plain-syntax">++)</span>
|
|
<span class="Extracts-plain-syntax"> </span><span class="Extracts-identifier-syntax">proc</span><span class="Extracts-plain-syntax">-></span><span class="Extracts-identifier-syntax">state</span><span class="Extracts-plain-syntax">.</span><span class="Extracts-identifier-syntax">variables</span><span class="Extracts-plain-syntax">[</span><span class="Extracts-identifier-syntax">i</span><span class="Extracts-plain-syntax">] = </span><span class="Extracts-identifier-syntax">i7_initial_variable_values</span><span class="Extracts-plain-syntax">[</span><span class="Extracts-identifier-syntax">i</span><span class="Extracts-plain-syntax">];</span>
|
|
<span class="Extracts-plain-syntax">}</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This is part of the extract file inform7_clib.c.</li></ul>
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|
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