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<!--Weave of 'Compile Values' 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">Inform7</a></li><li><a href="index.html">imperative</a></li><li><a href="index.html#2">Chapter 2: Values</a></li><li><b>Compile Values</b></li></ul></div>
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<p class="purpose">To compile specifications of values into Inter value opcodes or array entries.</p>
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<ul class="toc"><li><a href="2-cv.html#SP1">§1. Introduction</a></li><li><a href="2-cv.html#SP2">§2. An API for compiling values</a></li><li><a href="2-cv.html#SP6">§6. Implementation</a></li></ul><hr class="tocbar">
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<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>§1. Introduction. </b>Quite a range of data can be held as specifications: see <a href="../values-module/2-spc.html" class="internal">Specifications (in values)</a>.
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Inside the compiler these are stored as <span class="extract"><span class="extract-syntax">parse_node</span></span> pointers. This section of
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code aims to provide a single unified way to compile values, even though:
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</p>
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<ul class="items"><li>● We may need to compile either an array entry or an Inter <span class="extract"><span class="extract-syntax">val</span></span> opcode.
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We abstract this using <a href="../building-module/3-vh.html" class="internal">Value Holsters (in building)</a>, holders into which
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compiled values are placed.
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</li><li>● We sometimes need to compile a value which needs to be converted to a
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different kind first, a process called "casting".
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</li><li>● Sometimes a fresh copy of a value is needed, and sometimes a reference to
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its existing copy.
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</li></ul>
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<p class="commentary">This complexity was historically managed by having persistent "compilation
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modes" which Inform would enter for short periods and then exit, and during
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which specifications would compile difficulty. This had worked well enough
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since 2005 but by the 2020s there were 12 different modes, making in principle
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1024 different combinations to worry over. Because modes were entered and
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exited far away from their consequences, and in dozens of different parts of
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the compiler, it became difficult to reason with any confidence about what
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would happen, so worrying was about all that could be done.
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</p>
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<p class="commentary">In April 2021, all modes were removed except <span class="extract"><span class="extract-syntax">compile_spec_in_constant_mode</span></span>,
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and even that one is relatively benign: entry and exit into it is managed
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automatically by the code below, so that the rest of Inform no longer needs
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to think about compilation modes at all.
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">compile_spec_in_constant_mode</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
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<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">CompileValues::compiling_in_constant_mode</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">CompileValues::compiling_in_constant_mode</span></span>:<br/>Compile Rvalues - <a href="2-cr.html#SP2">§2</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">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">compile_spec_in_constant_mode</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. An API for compiling values. </b>When the rest of Inform wants to compile a value, it should call one of the
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following functions.
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</p>
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<p class="commentary">To begin with, compiling to array entries:
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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">CompileValues::to_array_entry_of_kind</span><span class="plain-syntax">(</span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">value</span><span class="plain-syntax">, </span><span class="identifier-syntax">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">K_wanted</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><a href="2-cv.html#SP2" class="function-link"><span class="function-syntax">CompileValues::to_array_entry</span></a><span class="plain-syntax">(</span>
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<span class="plain-syntax"> </span><a href="2-cv.html#SP7" class="function-link"><span class="function-syntax">CompileValues::cast_constant</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">value</span><span class="plain-syntax">, </span><span class="identifier-syntax">K_wanted</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">CompileValues::to_array_entry</span><span class="plain-syntax">(</span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">value</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">inter_ti</span><span class="plain-syntax"> </span><span class="identifier-syntax">v1</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">, </span><span class="identifier-syntax">v2</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">value_holster</span><span class="plain-syntax"> </span><span class="identifier-syntax">VH</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Holsters::new</span><span class="plain-syntax">(</span><span class="identifier-syntax">INTER_DATA_VHMODE</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><a href="2-cv.html#SP6" class="function-link"><span class="function-syntax">CompileValues::to_holster</span></a><span class="plain-syntax">(&</span><span class="identifier-syntax">VH</span><span class="plain-syntax">, </span><span class="identifier-syntax">value</span><span class="plain-syntax">, </span><span class="constant-syntax">COMPILE_SPEC_AS_CONSTANT</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Holsters::unholster_pair</span><span class="plain-syntax">(&</span><span class="identifier-syntax">VH</span><span class="plain-syntax">, &</span><span class="identifier-syntax">v1</span><span class="plain-syntax">, &</span><span class="identifier-syntax">v2</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">EmitArrays::generic_entry</span><span class="plain-syntax">(</span><span class="identifier-syntax">v1</span><span class="plain-syntax">, </span><span class="identifier-syntax">v2</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>Now constants, which can be compiled either to a holster or to a pair of <span class="extract"><span class="extract-syntax">inter_t</span></span>
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numbers. Use the latter as little as possible.
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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">CompileValues::constant_to_holster</span><span class="plain-syntax">(</span><span class="identifier-syntax">value_holster</span><span class="plain-syntax"> *</span><span class="identifier-syntax">VH</span><span class="plain-syntax">, </span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">value</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">K_wanted</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><a href="2-cv.html#SP6" class="function-link"><span class="function-syntax">CompileValues::to_holster</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">VH</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><a href="2-cv.html#SP7" class="function-link"><span class="function-syntax">CompileValues::cast_constant</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">value</span><span class="plain-syntax">, </span><span class="identifier-syntax">K_wanted</span><span class="plain-syntax">), </span><span class="constant-syntax">COMPILE_SPEC_AS_CONSTANT</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">CompileValues::constant_to_pair</span><span class="plain-syntax">(</span><span class="identifier-syntax">inter_ti</span><span class="plain-syntax"> *</span><span class="identifier-syntax">v1</span><span class="plain-syntax">, </span><span class="identifier-syntax">inter_ti</span><span class="plain-syntax"> *</span><span class="identifier-syntax">v2</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">value</span><span class="plain-syntax">, </span><span class="identifier-syntax">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">K_wanted</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">value_holster</span><span class="plain-syntax"> </span><span class="identifier-syntax">VH</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Holsters::new</span><span class="plain-syntax">(</span><span class="identifier-syntax">INTER_DATA_VHMODE</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><a href="2-cv.html#SP3" class="function-link"><span class="function-syntax">CompileValues::constant_to_holster</span></a><span class="plain-syntax">(&</span><span class="identifier-syntax">VH</span><span class="plain-syntax">, </span><span class="identifier-syntax">value</span><span class="plain-syntax">, </span><span class="identifier-syntax">K_wanted</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Holsters::unholster_pair</span><span class="plain-syntax">(&</span><span class="identifier-syntax">VH</span><span class="plain-syntax">, </span><span class="identifier-syntax">v1</span><span class="plain-syntax">, </span><span class="identifier-syntax">v2</span><span class="plain-syntax">);</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP4" class="paragraph-anchor"></a><b>§4. </b>A general method (i.e., not restricted to constant context) for compiling to a
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pair of <span class="extract"><span class="extract-syntax">inter_t</span></span> numbers. Use this as little as possible.
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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">CompileValues::to_pair</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">CompileValues::to_pair</span></span>:<br/>Compile Invocations Inline - <a href="5-cii.html#SP11_1">§11.1</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">inter_ti</span><span class="plain-syntax"> *</span><span class="identifier-syntax">v1</span><span class="plain-syntax">, </span><span class="identifier-syntax">inter_ti</span><span class="plain-syntax"> *</span><span class="identifier-syntax">v2</span><span class="plain-syntax">, </span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">spec</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">value_holster</span><span class="plain-syntax"> </span><span class="identifier-syntax">VH</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Holsters::new</span><span class="plain-syntax">(</span><span class="identifier-syntax">INTER_DATA_VHMODE</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><a href="2-cv.html#SP6" class="function-link"><span class="function-syntax">CompileValues::to_holster</span></a><span class="plain-syntax">(&</span><span class="identifier-syntax">VH</span><span class="plain-syntax">, </span><span class="identifier-syntax">spec</span><span class="plain-syntax">, </span><span class="constant-syntax">COMPILE_SPEC_AS_VALUE</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Holsters::unholster_pair</span><span class="plain-syntax">(&</span><span class="identifier-syntax">VH</span><span class="plain-syntax">, </span><span class="identifier-syntax">v1</span><span class="plain-syntax">, </span><span class="identifier-syntax">v2</span><span class="plain-syntax">);</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP5" class="paragraph-anchor"></a><b>§5. </b>Finally, for compiling to Inter opcodes in a <span class="extract"><span class="extract-syntax">val</span></span> context — in other words,
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for values as they appear in imperative code rather than in data structures.
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A "fresh" value should be made when we want the value compiled to be a new,
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independent copy of the data in question. Consider:
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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">let</span><span class="plain-syntax"> </span><span class="identifier-syntax">T</span><span class="plain-syntax"> </span><span class="identifier-syntax">be</span><span class="plain-syntax"> { </span><span class="constant-syntax">2</span><span class="plain-syntax">, </span><span class="constant-syntax">3</span><span class="plain-syntax">, </span><span class="constant-syntax">5</span><span class="plain-syntax">, </span><span class="constant-syntax">7</span><span class="plain-syntax"> };</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">let</span><span class="plain-syntax"> </span><span class="identifier-syntax">U</span><span class="plain-syntax"> </span><span class="identifier-syntax">be</span><span class="plain-syntax"> </span><span class="identifier-syntax">T</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">add</span><span class="plain-syntax"> </span><span class="constant-syntax">11</span><span class="plain-syntax"> </span><span class="identifier-syntax">to</span><span class="plain-syntax"> </span><span class="identifier-syntax">T</span><span class="plain-syntax">;</span>
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</pre>
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<p class="commentary">Clearly <span class="extract"><span class="extract-syntax">U</span></span> must be set to a fresh copy of the data in <span class="extract"><span class="extract-syntax">T</span></span>, not a reference to the
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same data. So the <span class="extract"><span class="extract-syntax">T</span></span> in line 2 must be compiled as "fresh", whereas the <span class="extract"><span class="extract-syntax">T</span></span> in
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line 3 must 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">CompileValues::to_code_val</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">CompileValues::to_code_val</span></span>:<br/>Compile Rvalues - <a href="2-cr.html#SP1_3">§1.3</a><br/>Compile Lvalues - <a href="2-cl.html#SP1_3">§1.3</a>, <a href="2-cl.html#SP1_3_2">§1.3.2</a>, <a href="2-cl.html#SP1_4">§1.4</a>, <a href="2-cl.html#SP2">§2</a><br/>Compile Conditions - <a href="2-cc.html#SP1">§1</a>, <a href="2-cc.html#SP1_1">§1.1</a>, <a href="2-cc.html#SP1_2">§1.2</a><br/>Compile Loops - <a href="4-cl.html#SP1_2">§1.2</a>, <a href="4-cl.html#SP2">§2</a>, <a href="4-cl.html#SP4">§4</a><br/>Deciding to Defer - <a href="4-dtd.html#SP4_2">§4.2</a>, <a href="4-dtd.html#SP15">§15</a>, <a href="4-dtd.html#SP17">§17</a>, <a href="4-dtd.html#SP18">§18</a>, <a href="4-dtd.html#SP20">§20</a>, <a href="4-dtd.html#SP21">§21</a>, <a href="4-dtd.html#SP22">§22</a><br/>Cinders and Deferrals - <a href="4-cad.html#SP4">§4</a><br/>Compile Invocations As Calls - <a href="5-ciac.html#SP3">§3</a><br/>Compile Invocations Inline - <a href="5-cii.html#SP11">§11</a>, <a href="5-cii.html#SP12">§12</a><br/>Compile Solutions to Equations - <a href="5-cste.html#SP4">§4</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">value</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><a href="2-cv.html#SP5" class="function-link"><span class="function-syntax">CompileValues::to_code_val_inner</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">value</span><span class="plain-syntax">, </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">, </span><span class="constant-syntax">COMPILE_SPEC_AS_VALUE</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">CompileValues::to_code_val_of_kind</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">CompileValues::to_code_val_of_kind</span></span>:<br/>Compile Schemas - <a href="4-cs.html#SP3_2">§3.2</a>, <a href="4-cs.html#SP5_2">§5.2</a><br/>Compile Blocks and Lines - <a href="5-cbal.html#SP4_3_5_2">§4.3.5.2</a>, <a href="5-cbal.html#SP4_3_5_5">§4.3.5.5</a>, <a href="5-cbal.html#SP4_3_5_1_2">§4.3.5.1.2</a><br/>Compile Invocations Inline - <a href="5-cii.html#SP6_1_1_3">§6.1.1.3</a>, <a href="5-cii.html#SP6_1_1_4_9">§6.1.1.4.9</a>, <a href="5-cii.html#SP6_1_1_4_10">§6.1.1.4.10</a>, <a href="5-cii.html#SP6_5_8">§6.5.8</a>, <a href="5-cii.html#SP6_5_8_1">§6.5.8.1</a>, <a href="5-cii.html#SP6_5_8_2">§6.5.8.2</a>, <a href="5-cii.html#SP6_5_8_3">§6.5.8.3</a><br/>Compile Arithmetic - <a href="5-ca.html#SP1_3_1">§1.3.1</a>, <a href="5-ca.html#SP1_3_2">§1.3.2</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">value</span><span class="plain-syntax">, </span><span class="identifier-syntax">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">K</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><a href="2-cv.html#SP5" class="function-link"><span class="function-syntax">CompileValues::to_code_val_inner</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">value</span><span class="plain-syntax">, </span><span class="identifier-syntax">K</span><span class="plain-syntax">, </span><span class="constant-syntax">COMPILE_SPEC_AS_VALUE</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">CompileValues::to_fresh_code_val_of_kind</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">CompileValues::to_fresh_code_val_of_kind</span></span>:<br/>Compile Schemas - <a href="4-cs.html#SP3_2">§3.2</a>, <a href="4-cs.html#SP5_2">§5.2</a><br/>Compile Invocations - <a href="5-ci.html#SP1_3_1_2_1_2">§1.3.1.2.1.2</a><br/>Compile Invocations As Calls - <a href="5-ciac.html#SP2_2">§2.2</a><br/>Compile Invocations Inline - <a href="5-cii.html#SP6_1_1_3">§6.1.1.3</a>, <a href="5-cii.html#SP6_1_1_4_7_1">§6.1.1.4.7.1</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">value</span><span class="plain-syntax">, </span><span class="identifier-syntax">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">K</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><a href="2-cv.html#SP5" class="function-link"><span class="function-syntax">CompileValues::to_code_val_inner</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">value</span><span class="plain-syntax">, </span><span class="identifier-syntax">K</span><span class="plain-syntax">, </span><span class="constant-syntax">COMPILE_SPEC_AS_FRESH_VALUE</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">CompileValues::to_code_val_inner</span><span class="plain-syntax">(</span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">value</span><span class="plain-syntax">, </span><span class="identifier-syntax">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">K</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">how</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">down</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">K</span><span class="plain-syntax">) </span><span class="identifier-syntax">value</span><span class="plain-syntax"> = </span><a href="2-cv.html#SP8" class="function-link"><span class="function-syntax">CompileValues::cast_nonconstant</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">value</span><span class="plain-syntax">, </span><span class="identifier-syntax">K</span><span class="plain-syntax">, &</span><span class="identifier-syntax">down</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">value_holster</span><span class="plain-syntax"> </span><span class="identifier-syntax">VH</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Holsters::new</span><span class="plain-syntax">(</span><span class="identifier-syntax">INTER_VAL_VHMODE</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><a href="2-cv.html#SP6" class="function-link"><span class="function-syntax">CompileValues::to_holster</span></a><span class="plain-syntax">(&</span><span class="identifier-syntax">VH</span><span class="plain-syntax">, </span><span class="identifier-syntax">value</span><span class="plain-syntax">, </span><span class="identifier-syntax">how</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">down</span><span class="plain-syntax">) </span><span class="identifier-syntax">EmitCode::up</span><span class="plain-syntax">();</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP6" class="paragraph-anchor"></a><b>§6. Implementation. </b>All of the functions in the above API make use of these private ones:
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</p>
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<pre class="definitions code-font"><span class="definition-keyword">define</span> <span class="constant-syntax">COMPILE_SPEC_AS_CONSTANT</span><span class="plain-syntax"> </span><span class="constant-syntax">1</span>
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<span class="definition-keyword">define</span> <span class="constant-syntax">COMPILE_SPEC_AS_VALUE</span><span class="plain-syntax"> </span><span class="constant-syntax">2</span>
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<span class="definition-keyword">define</span> <span class="constant-syntax">COMPILE_SPEC_AS_FRESH_VALUE</span><span class="plain-syntax"> </span><span class="constant-syntax">3</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">CompileValues::to_holster</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">CompileValues::to_holster</span></span>:<br/><a href="2-cv.html#SP2">§2</a>, <a href="2-cv.html#SP3">§3</a>, <a href="2-cv.html#SP4">§4</a>, <a href="2-cv.html#SP5">§5</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">value_holster</span><span class="plain-syntax"> *</span><span class="identifier-syntax">VH</span><span class="plain-syntax">, </span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">value</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">how</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">how</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">COMPILE_SPEC_AS_CONSTANT:</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">LOGIF</span><span class="plain-syntax">(</span><span class="identifier-syntax">EXPRESSIONS</span><span class="plain-syntax">, </span><span class="string-syntax">"Compiling (const): $P\n"</span><span class="plain-syntax">, </span><span class="identifier-syntax">value</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">COMPILE_SPEC_AS_VALUE:</span>
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|
<span class="plain-syntax"> </span><span class="identifier-syntax">LOGIF</span><span class="plain-syntax">(</span><span class="identifier-syntax">EXPRESSIONS</span><span class="plain-syntax">, </span><span class="string-syntax">"Compiling (value): $P\n"</span><span class="plain-syntax">, </span><span class="identifier-syntax">value</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">COMPILE_SPEC_AS_FRESH_VALUE:</span>
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|
<span class="plain-syntax"> </span><span class="identifier-syntax">LOGIF</span><span class="plain-syntax">(</span><span class="identifier-syntax">EXPRESSIONS</span><span class="plain-syntax">, </span><span class="string-syntax">"Compiling (fresh): $P\n"</span><span class="plain-syntax">, </span><span class="identifier-syntax">value</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>
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|
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">s</span><span class="plain-syntax"> = </span><span class="identifier-syntax">compile_spec_in_constant_mode</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">how</span><span class="plain-syntax"> == </span><span class="constant-syntax">COMPILE_SPEC_AS_CONSTANT</span><span class="plain-syntax">) </span><span class="identifier-syntax">compile_spec_in_constant_mode</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">else</span><span class="plain-syntax"> </span><span class="identifier-syntax">compile_spec_in_constant_mode</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">LOG_INDENT</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-cv.html#SP6_1" class="named-paragraph-link"><span class="named-paragraph">Take care of any freshness</span><span class="named-paragraph-number">6.1</span></a></span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">LOG_OUTDENT</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">compile_spec_in_constant_mode</span><span class="plain-syntax"> = </span><span class="identifier-syntax">s</span><span class="plain-syntax">;</span>
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|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP6_1" class="paragraph-anchor"></a><b>§6.1. </b>This implements "fresh" mode. For regular values like numbers there's no
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|
difference, but if our value is a block value such as a list then we evaluate to
|
|
a copy of it, not to the original. Making that copy means calling <span class="extract"><span class="extract-syntax">BlkValueCopy</span></span>
|
|
at runtime, so it cannot be done in a data holster (i.e., when <span class="extract"><span class="extract-syntax">VH</span></span> is an
|
|
<span class="extract"><span class="extract-syntax">INTER_DATA_VHMODE</span></span> holster).
|
|
</p>
|
|
|
|
<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Take care of any freshness</span><span class="named-paragraph-number">6.1</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">value</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NonlocalVariables::substitute_constants</span><span class="plain-syntax">(</span><span class="identifier-syntax">value</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">K_found</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Specifications::to_kind</span><span class="plain-syntax">(</span><span class="identifier-syntax">value</span><span class="plain-syntax">);</span>
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|
<span class="plain-syntax"> </span><a href="2-cv.html#SP9" class="function-link"><span class="function-syntax">CompileValues::note_that_kind_is_used</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">K_found</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">made_fresh</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">how</span><span class="plain-syntax"> == </span><span class="constant-syntax">COMPILE_SPEC_AS_FRESH_VALUE</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">VH</span><span class="plain-syntax">-></span><span class="identifier-syntax">vhmode_wanted</span><span class="plain-syntax"> == </span><span class="identifier-syntax">INTER_DATA_VHMODE</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">"must compile by reference in INTER_DATA_VHMODE"</span><span class="plain-syntax">);</span>
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|
<span class="plain-syntax"> </span><span class="identifier-syntax">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">K</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Specifications::to_kind</span><span class="plain-syntax">(</span><span class="identifier-syntax">value</span><span class="plain-syntax">);</span>
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|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">K</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">Kinds::Behaviour::uses_block_values</span><span class="plain-syntax">(</span><span class="identifier-syntax">K</span><span class="plain-syntax">))) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">EmitCode::call</span><span class="plain-syntax">(</span><span class="identifier-syntax">Hierarchy::find</span><span class="plain-syntax">(</span><span class="identifier-syntax">BLKVALUECOPY_HL</span><span class="plain-syntax">));</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">EmitCode::down</span><span class="plain-syntax">();</span>
|
|
<span class="plain-syntax"> </span><a href="3-sf.html#SP21" class="function-link"><span class="function-syntax">Frames::emit_new_local_value</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">K</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">made_fresh</span><span class="plain-syntax"> = </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="2-cv.html#SP6_1_1" class="named-paragraph-link"><span class="named-paragraph">Actually compile</span><span class="named-paragraph-number">6.1.1</span></a></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">made_fresh</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">EmitCode::up</span><span class="plain-syntax">();</span>
|
|
<span class="plain-syntax"> }</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="2-cv.html#SP6">§6</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP6_1_1" class="paragraph-anchor"></a><b>§6.1.1. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Actually compile</span><span class="named-paragraph-number">6.1.1</span></span><span class="comment-syntax"> =</span>
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Lvalues::is_lvalue</span><span class="plain-syntax">(</span><span class="identifier-syntax">value</span><span class="plain-syntax">)) {</span>
|
|
<span class="plain-syntax"> </span><a href="2-cl.html#SP1" class="function-link"><span class="function-syntax">CompileLvalues::in_rvalue_context</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">VH</span><span class="plain-syntax">, </span><span class="identifier-syntax">value</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">Rvalues::is_rvalue</span><span class="plain-syntax">(</span><span class="identifier-syntax">value</span><span class="plain-syntax">)) {</span>
|
|
<span class="plain-syntax"> </span><a href="2-cr.html#SP1" class="function-link"><span class="function-syntax">CompileRvalues::compile</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">VH</span><span class="plain-syntax">, </span><span class="identifier-syntax">value</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">VH</span><span class="plain-syntax">-></span><span class="identifier-syntax">vhmode_provided</span><span class="plain-syntax"> == </span><span class="identifier-syntax">INTER_DATA_VHMODE</span><span class="plain-syntax">) &&</span>
|
|
<span class="plain-syntax"> (</span><span class="identifier-syntax">VH</span><span class="plain-syntax">-></span><span class="identifier-syntax">vhmode_wanted</span><span class="plain-syntax"> == </span><span class="identifier-syntax">INTER_VAL_VHMODE</span><span class="plain-syntax">)) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Holsters::unholster_to_code_val</span><span class="plain-syntax">(</span><span class="identifier-syntax">Emit::tree</span><span class="plain-syntax">(), </span><span class="identifier-syntax">VH</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">Specifications::is_condition</span><span class="plain-syntax">(</span><span class="identifier-syntax">value</span><span class="plain-syntax">)) {</span>
|
|
<span class="plain-syntax"> </span><a href="2-cc.html#SP1" class="function-link"><span class="function-syntax">CompileConditions::compile</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">VH</span><span class="plain-syntax">, </span><span class="identifier-syntax">value</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> }</span>
|
|
</pre>
|
|
<ul class="endnotetexts"><li>This code is used in <a href="2-cv.html#SP6_1">§6.1</a>.</li></ul>
|
|
<p class="commentary firstcommentary"><a id="SP7" class="paragraph-anchor"></a><b>§7. </b>"Casting" is converting a value of one kind to a value of another but which has
|
|
the same meaning, give or take. In a constant context, the main cast we can
|
|
perform is from literal <span class="extract"><span class="extract-syntax">K_number</span></span> values like <span class="extract"><span class="extract-syntax">31</span></span> to turn them into literal
|
|
<span class="extract"><span class="extract-syntax">K_real_number</span></span> values, a process called "promotion".
|
|
</p>
|
|
|
|
<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="function-syntax">CompileValues::cast_constant</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">CompileValues::cast_constant</span></span>:<br/><a href="2-cv.html#SP2">§2</a>, <a href="2-cv.html#SP3">§3</a>, <a href="2-cv.html#SP8">§8</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">value</span><span class="plain-syntax">, </span><span class="identifier-syntax">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">K_wanted</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">value</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NonlocalVariables::substitute_constants</span><span class="plain-syntax">(</span><span class="identifier-syntax">value</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><a href="2-cv.html#SP9" class="function-link"><span class="function-syntax">CompileValues::note_that_kind_is_used</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">K_wanted</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">value</span><span class="plain-syntax"> = </span><span class="identifier-syntax">LiteralReals::promote_number_if_necessary</span><span class="plain-syntax">(</span><span class="identifier-syntax">value</span><span class="plain-syntax">, </span><span class="identifier-syntax">K_wanted</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">K_found</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Specifications::to_kind</span><span class="plain-syntax">(</span><span class="identifier-syntax">value</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">K_understanding</span><span class="plain-syntax">) &&</span>
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<span class="plain-syntax"> (</span><span class="identifier-syntax">Kinds::eq</span><span class="plain-syntax">(</span><span class="identifier-syntax">K_wanted</span><span class="plain-syntax">, </span><span class="identifier-syntax">K_understanding</span><span class="plain-syntax">)) && (</span><span class="identifier-syntax">Kinds::eq</span><span class="plain-syntax">(</span><span class="identifier-syntax">K_found</span><span class="plain-syntax">, </span><span class="identifier-syntax">K_text</span><span class="plain-syntax">)))</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Node::set_kind_of_value</span><span class="plain-syntax">(</span><span class="identifier-syntax">value</span><span class="plain-syntax">, </span><span class="identifier-syntax">K_understanding</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">value</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="SP8" class="paragraph-anchor"></a><b>§8. </b>In a value context we can additionally compile code to perform the conversion
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at runtime, which extends the range of promotions we can make.
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="function-syntax">CompileValues::cast_nonconstant</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">CompileValues::cast_nonconstant</span></span>:<br/><a href="2-cv.html#SP5">§5</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">value</span><span class="plain-syntax">, </span><span class="identifier-syntax">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">K_wanted</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">down</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">value</span><span class="plain-syntax"> = </span><a href="2-cv.html#SP7" class="function-link"><span class="function-syntax">CompileValues::cast_constant</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">value</span><span class="plain-syntax">, </span><span class="identifier-syntax">K_wanted</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">K_found</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Specifications::to_kind</span><span class="plain-syntax">(</span><span class="identifier-syntax">value</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><a href="2-cv.html#SP9" class="function-link"><span class="function-syntax">CompileValues::note_that_kind_is_used</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">K_found</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">EmitCode::casting_call</span><span class="plain-syntax">(</span><span class="identifier-syntax">K_found</span><span class="plain-syntax">, </span><span class="identifier-syntax">K_wanted</span><span class="plain-syntax">, </span><span class="identifier-syntax">down</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">value</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="SP9" class="paragraph-anchor"></a><b>§9. </b>Certain kinds of value cannot be used on every virtual machine; for examole,
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the Z-machine does not support real numbers.
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</p>
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|
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<pre class="displayed-code all-displayed-code code-font">
|
|
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">VM_non_support_problem_issued</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">CompileValues::note_that_kind_is_used</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">CompileValues::note_that_kind_is_used</span></span>:<br/><a href="2-cv.html#SP6_1">§6.1</a>, <a href="2-cv.html#SP7">§7</a>, <a href="2-cv.html#SP8">§8</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">K</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><a href="2-cv.html#SP9" class="function-link"><span class="function-syntax">CompileValues::target_VM_supports_kind</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">K</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">VM_non_support_problem_issued</span><span class="plain-syntax"> == </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">) {</span>
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|
<span class="plain-syntax"> </span><span class="identifier-syntax">VM_non_support_problem_issued</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">StandardProblems::handmade_problem</span><span class="plain-syntax">(</span><span class="identifier-syntax">Task::syntax_tree</span><span class="plain-syntax">(),</span>
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|
<span class="plain-syntax"> </span><span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">PM_KindRequiresGlulx</span><span class="plain-syntax">));</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::quote_source</span><span class="plain-syntax">(1, </span><span class="identifier-syntax">current_sentence</span><span class="plain-syntax">);</span>
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|
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::quote_kind</span><span class="plain-syntax">(2, </span><span class="identifier-syntax">K</span><span class="plain-syntax">);</span>
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|
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::issue_problem_segment</span><span class="plain-syntax">(</span>
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|
<span class="plain-syntax"> </span><span class="string-syntax">"You wrote %1, but with the settings for this project as they are, "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"I'm unable to make use of %2. (Try changing to Glulx on the Settings "</span>
|
|
<span class="plain-syntax"> </span><span class="string-syntax">"panel; that should fix it.)"</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Problems::issue_problem_end</span><span class="plain-syntax">();</span>
|
|
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">CompileValues::target_VM_supports_kind</span><span class="plain-syntax">(</span><span class="identifier-syntax">kind</span><span class="plain-syntax"> *</span><span class="identifier-syntax">K</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">target_vm</span><span class="plain-syntax"> *</span><span class="identifier-syntax">VM</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Task::vm</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">VM</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">"target VM not set yet"</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">Kinds::FloatingPoint::uses_floating_point</span><span class="plain-syntax">(</span><span class="identifier-syntax">K</span><span class="plain-syntax">)) &&</span>
|
|
<span class="plain-syntax"> (</span><span class="identifier-syntax">TargetVMs::supports_floating_point</span><span class="plain-syntax">(</span><span class="identifier-syntax">VM</span><span class="plain-syntax">) == </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">)) </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
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