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<main role="main">
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<!--Weave of 'Compiling from Specifications' 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#3">Chapter 3: Compiling Propositions</a></li><li><b>Compiling from Specifications</b></li></ul></div>
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<p class="purpose">To compile specifications into Inform 6 values, conditions or void expressions.</p>
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<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>§1. </b>In a more traditional compiler, the code-generator would be something of a
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landmark — one of the three or four most important stations. Here it's
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something of an anticlimax, partly because traditional "code" — values
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and statements — are only a small part of the I6 we have to generate,
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which also includes object and class definitions, grammar, and so on.
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</p>
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<p class="commentary">Still, this is the key point where the actual rather than generic
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specifications — phrases to do something, or to decide things; constants;
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variables; conditions — finally convert into I6 code.
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</p>
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<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>§2. </b>For the most part this is "modeless" — that is, the I6 code generated
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by a specification does not depend on any context. But not entirely so, and
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we have a small set of "C-modes", each of which slightly alters the result
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to fit some particular need.
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</p>
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<p class="commentary">The rule is that any part of Inform needing to do something in a specific
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mode should place that operation within a pair of <span class="extract"><span class="extract-syntax">BEGIN_COMPILATION_MODE</span></span>
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and <span class="extract"><span class="extract-syntax">END_COMPILATION_MODE</span></span> macros, in such a way that execution always
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passes from one to the other. Within those bookends, it can use either the
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enter or exit macros to switch a particular mode on or off.
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</p>
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<pre class="definitions code-font"><span class="definition-keyword">define</span> <span class="constant-syntax">BEGIN_COMPILATION_MODE</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">status_quo_ante</span><span class="plain-syntax"> = </span><span class="identifier-syntax">compilation_mode</span><span class="plain-syntax">;</span>
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<span class="definition-keyword">define</span> <span class="identifier-syntax">COMPILATION_MODE_ENTER</span><span class="plain-syntax">(</span><span class="identifier-syntax">mode</span><span class="plain-syntax">)</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">compilation_mode</span><span class="plain-syntax"> |= </span><span class="identifier-syntax">mode</span><span class="plain-syntax">;</span>
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<span class="definition-keyword">define</span> <span class="identifier-syntax">COMPILATION_MODE_EXIT</span><span class="plain-syntax">(</span><span class="identifier-syntax">mode</span><span class="plain-syntax">)</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">compilation_mode</span><span class="plain-syntax"> &= (~</span><span class="identifier-syntax">mode</span><span class="plain-syntax">);</span>
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<span class="definition-keyword">define</span> <span class="constant-syntax">END_COMPILATION_MODE</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">compilation_mode</span><span class="plain-syntax"> = </span><span class="identifier-syntax">status_quo_ante</span><span class="plain-syntax">;</span>
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<span class="definition-keyword">define</span> <span class="identifier-syntax">TEST_COMPILATION_MODE</span><span class="plain-syntax">(</span><span class="identifier-syntax">mode</span><span class="plain-syntax">)</span>
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<span class="plain-syntax"> (</span><span class="identifier-syntax">compilation_mode</span><span class="plain-syntax"> & </span><span class="identifier-syntax">mode</span><span class="plain-syntax">)</span>
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<span class="definition-keyword">define</span> <span class="constant-syntax">DEREFERENCE_POINTERS_CMODE</span><span class="plain-syntax"> </span><span class="constant-syntax">0x00000001</span><span class="plain-syntax"> </span><span class="comment-syntax"> make an independent copy of the result if on the heap</span>
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<span class="definition-keyword">define</span> <span class="constant-syntax">IMPLY_NEWLINES_IN_SAY_CMODE</span><span class="plain-syntax"> </span><span class="constant-syntax">0x00000010</span><span class="plain-syntax"> </span><span class="comment-syntax"> at the end, that is</span>
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<span class="definition-keyword">define</span> <span class="constant-syntax">PERMIT_LOCALS_IN_TEXT_CMODE</span><span class="plain-syntax"> </span><span class="constant-syntax">0x00000020</span><span class="plain-syntax"> </span><span class="comment-syntax"> unless casting to text</span>
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<span class="definition-keyword">define</span> <span class="constant-syntax">COMPILE_TEXT_TO_QUOT_CMODE</span><span class="plain-syntax"> </span><span class="constant-syntax">0x00000080</span><span class="plain-syntax"> </span><span class="comment-syntax"> for the idiosyncratic I6 </span><span class="extract"><span class="extract-syntax">box</span></span><span class="comment-syntax"> statement</span>
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<span class="definition-keyword">define</span> <span class="constant-syntax">COMPILE_TEXT_TO_XML_CMODE</span><span class="plain-syntax"> </span><span class="constant-syntax">0x00000100</span><span class="plain-syntax"> </span><span class="comment-syntax"> use XML escapes and UTF-8 encoding</span>
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<span class="definition-keyword">define</span> <span class="constant-syntax">TRUNCATE_TEXT_CMODE</span><span class="plain-syntax"> </span><span class="constant-syntax">0x00000200</span><span class="plain-syntax"> </span><span class="comment-syntax"> into a plausible filename length</span>
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<span class="definition-keyword">define</span> <span class="constant-syntax">COMPILE_TEXT_TO_I6_CMODE</span><span class="plain-syntax"> </span><span class="constant-syntax">0x00001000</span><span class="plain-syntax"> </span><span class="comment-syntax"> for bibliographic text to I6 constants</span>
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<span class="definition-keyword">define</span> <span class="constant-syntax">CONSTANT_CMODE</span><span class="plain-syntax"> </span><span class="constant-syntax">0x00002000</span><span class="plain-syntax"> </span><span class="comment-syntax"> compiling values in a constant context</span>
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<span class="definition-keyword">define</span> <span class="constant-syntax">SPECIFICATIONS_CMODE</span><span class="plain-syntax"> </span><span class="constant-syntax">0x00004000</span><span class="plain-syntax"> </span><span class="comment-syntax"> compiling specifications at all</span>
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<span class="definition-keyword">define</span> <span class="constant-syntax">BLANK_OUT_CMODE</span><span class="plain-syntax"> </span><span class="constant-syntax">0x00008000</span><span class="plain-syntax"> </span><span class="comment-syntax"> blank out table references</span>
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<span class="definition-keyword">define</span> <span class="constant-syntax">TREAT_AS_LVALUE_CMODE</span><span class="plain-syntax"> </span><span class="constant-syntax">0x00010000</span><span class="plain-syntax"> </span><span class="comment-syntax"> similarly affects table references</span>
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<span class="definition-keyword">define</span> <span class="constant-syntax">JUST_ROUTINE_CMODE</span><span class="plain-syntax"> </span><span class="constant-syntax">0x00020000</span><span class="plain-syntax"> </span><span class="comment-syntax"> similarly affects table references</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">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">compilation_mode</span><span class="plain-syntax"> = </span><span class="constant-syntax">DEREFERENCE_POINTERS_CMODE</span><span class="plain-syntax"> + </span><span class="constant-syntax">IMPLY_NEWLINES_IN_SAY_CMODE</span><span class="plain-syntax">; </span><span class="comment-syntax"> default</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP3" class="paragraph-anchor"></a><b>§3. </b>These modes are all explained where they are used. The one used right here
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is <span class="extract"><span class="extract-syntax">DEREFERENCE_POINTERS_CMODE</span></span>. This applies only when compiling a specification
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which generates a pointer value — an I6 value which is a pointer to a larger
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block of data on the heap, such as a list or text.
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</p>
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<p class="commentary">Inform presents such values to the end user exactly as if they are non-pointer
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values. It must always be careful to ensure that there are never two different
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I7 values each holding pointers to the same block of data, because then
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changing one would also change the other. So we ordinarily need
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to make a copy of any block of data produced as a value; this is called
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"dereferencing".
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</p>
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<p class="commentary">But there are some circumstances — initialising entries in an Inform 6 array,
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for instance — where we don't want to do this, and indeed can't, because the
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code to handle dereferencing is invalid as an Inform 6 constant. The mode
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therefore exists as a way of temporarily turning off dereferencing — by
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default, it is always on.
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</p>
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<p class="commentary firstcommentary"><a id="SP4" class="paragraph-anchor"></a><b>§4. </b>The outer shell here has two purposes. One is to copy the specification
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onto the local stack frame and then compile that copy — useful since
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compilation may alter its contents. The other purpose, and this is not to
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be dismissed lightly, is to ensure correct indentation in the log when
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we exit unexpectedly, for instance due to a problem.
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</p>
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<p class="commentary firstcommentary"><a id="SP5" class="paragraph-anchor"></a><b>§5. </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">Specifications::Compiler::compile_inner</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">Specifications::Compiler::compile_inner</span></span>:<br/><a href="3-cfs.html#SP8">§8</a><br/>Compile Invocations Inline - <a href="4-cii.html#SP8">§8</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">spec</span><span class="plain-syntax">) {</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: $P\n"</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">spec</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NonlocalVariables::substitute_constants</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="constant-syntax">BEGIN_COMPILATION_MODE</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">COMPILATION_MODE_ENTER</span><span class="plain-syntax">(</span><span class="constant-syntax">SPECIFICATIONS_CMODE</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="identifier-syntax">parse_node</span><span class="plain-syntax"> </span><span class="identifier-syntax">breakable_copy</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><a href="3-cfs.html#SP6" class="function-link"><span class="function-syntax">Specifications::Compiler::spec_compile_primitive</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">VH</span><span class="plain-syntax">, &</span><span class="identifier-syntax">breakable_copy</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>
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<span class="plain-syntax"> </span><span class="constant-syntax">END_COMPILATION_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="SP6" class="paragraph-anchor"></a><b>§6. </b>So this is where the compilation is done, or rather, delegated:
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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">Specifications::Compiler::spec_compile_primitive</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">Specifications::Compiler::spec_compile_primitive</span></span>:<br/><a href="3-cfs.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">spec</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">spec</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">RTKinds::notify_of_use</span><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="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">dereffed</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">TEST_COMPILATION_MODE</span><span class="plain-syntax">(</span><span class="constant-syntax">DEREFERENCE_POINTERS_CMODE</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">spec</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_pointer_values</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="identifier-syntax">Produce::inv_call_iname</span><span class="plain-syntax">(</span><span class="identifier-syntax">Emit::tree</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>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Produce::down</span><span class="plain-syntax">(</span><span class="identifier-syntax">Emit::tree</span><span class="plain-syntax">());</span>
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<span class="plain-syntax"> </span><a href="2-sf.html#SP17" 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>
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<span class="plain-syntax"> </span><span class="identifier-syntax">dereffed</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>
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<span class="plain-syntax"> }</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Lvalues::is_lvalue</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">Lvalues::compile</span><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>
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<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">spec</span><span class="plain-syntax">)) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Rvalues::compile</span><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>
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<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="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>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Holsters::to_val_mode</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>
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<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">spec</span><span class="plain-syntax">)) {</span>
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|
<span class="plain-syntax"> </span><span class="identifier-syntax">Conditions::compile</span><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="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">dereffed</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Produce::up</span><span class="plain-syntax">(</span><span class="identifier-syntax">Emit::tree</span><span class="plain-syntax">());</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax">}</span>
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|
</pre>
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|
<p class="commentary firstcommentary"><a id="SP7" class="paragraph-anchor"></a><b>§7. </b>A variation on this is to compile a specification which represents
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a value in a context where a particular kind of value is expected:
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</p>
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|
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|
<pre class="displayed-code all-displayed-code code-font">
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|
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Specifications::Compiler::emit_to_kind</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">Specifications::Compiler::emit_to_kind</span></span>:<br/>Emitting from Schemas - <a href="3-efs.html#SP2_3">§2.3</a><br/>Compile Invocations - <a href="4-ci.html#SP2_2_3_1_1">§2.2.3.1.1</a><br/>Compile Invocations As Calls - <a href="4-ciac.html#SP2_1">§2.1</a><br/>Compile Invocations Inline - <a href="4-cii.html#SP3_1_1_3">§3.1.1.3</a>, <a href="4-cii.html#SP3_1_1_4_7_1">§3.1.1.4.7.1</a>, <a href="4-cii.html#SP3_5_8">§3.5.8</a>, <a href="4-cii.html#SP3_5_8_1">§3.5.8.1</a>, <a href="4-cii.html#SP3_5_8_2">§3.5.8.2</a>, <a href="4-cii.html#SP3_5_8_3">§3.5.8.3</a><br/>Compile Arithmetic - <a href="4-ca.html#SP1_2_1">§1.2.1</a>, <a href="4-ca.html#SP1_2_2">§1.2.2</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_wanted</span><span class="plain-syntax">) {</span>
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|
<span class="plain-syntax"> </span><span class="identifier-syntax">RTKinds::notify_of_use</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="identifier-syntax">RTKinds::notify_of_use</span><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="reserved-syntax">if</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_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>
|
|
<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>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">K_found</span><span class="plain-syntax"> = </span><span class="identifier-syntax">K_understanding</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="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="identifier-syntax">RTKinds::emit_cast_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>
|
|
<span class="plain-syntax"> </span><span class="constant-syntax">BEGIN_COMPILATION_MODE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">COMPILATION_MODE_ENTER</span><span class="plain-syntax">(</span><span class="constant-syntax">PERMIT_LOCALS_IN_TEXT_CMODE</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><a href="3-cfs.html#SP8" class="function-link"><span class="function-syntax">Specifications::Compiler::emit_as_val</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">K_value</span><span class="plain-syntax">, </span><span class="identifier-syntax">value</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="constant-syntax">END_COMPILATION_MODE</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">down</span><span class="plain-syntax">) </span><span class="identifier-syntax">Produce::up</span><span class="plain-syntax">(</span><span class="identifier-syntax">Emit::tree</span><span class="plain-syntax">());</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
|
|
<p class="commentary firstcommentary"><a id="SP8" class="paragraph-anchor"></a><b>§8. </b>And the same in a constant context:
|
|
</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">Specifications::Compiler::compile_constant_to_kind_vh</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><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">RTKinds::notify_of_use</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="constant-syntax">BEGIN_COMPILATION_MODE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">COMPILATION_MODE_EXIT</span><span class="plain-syntax">(</span><span class="constant-syntax">DEREFERENCE_POINTERS_CMODE</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">COMPILATION_MODE_ENTER</span><span class="plain-syntax">(</span><span class="constant-syntax">CONSTANT_CMODE</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><a href="3-cfs.html#SP5" class="function-link"><span class="function-syntax">Specifications::Compiler::compile_inner</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">VH</span><span class="plain-syntax">, </span><a href="3-cfs.html#SP8" class="function-link"><span class="function-syntax">Specifications::Compiler::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="plain-syntax"> </span><span class="constant-syntax">END_COMPILATION_MODE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Specifications::Compiler::emit_constant_to_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>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">RTKinds::notify_of_use</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="constant-syntax">BEGIN_COMPILATION_MODE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">COMPILATION_MODE_EXIT</span><span class="plain-syntax">(</span><span class="constant-syntax">DEREFERENCE_POINTERS_CMODE</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">COMPILATION_MODE_ENTER</span><span class="plain-syntax">(</span><span class="constant-syntax">CONSTANT_CMODE</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">casted</span><span class="plain-syntax"> = </span><a href="3-cfs.html#SP8" class="function-link"><span class="function-syntax">Specifications::Compiler::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="plain-syntax"> </span><span class="constant-syntax">END_COMPILATION_MODE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><a href="3-cfs.html#SP8" class="function-link"><span class="function-syntax">Specifications::Compiler::emit</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">casted</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Specifications::Compiler::emit_constant_to_kind_as_val</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>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">RTKinds::notify_of_use</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="constant-syntax">BEGIN_COMPILATION_MODE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">COMPILATION_MODE_EXIT</span><span class="plain-syntax">(</span><span class="constant-syntax">DEREFERENCE_POINTERS_CMODE</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">COMPILATION_MODE_ENTER</span><span class="plain-syntax">(</span><span class="constant-syntax">CONSTANT_CMODE</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">casted</span><span class="plain-syntax"> = </span><a href="3-cfs.html#SP8" class="function-link"><span class="function-syntax">Specifications::Compiler::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="plain-syntax"> </span><span class="constant-syntax">END_COMPILATION_MODE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><a href="3-cfs.html#SP8" class="function-link"><span class="function-syntax">Specifications::Compiler::emit_as_val</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">K_value</span><span class="plain-syntax">, </span><span class="identifier-syntax">casted</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="function-syntax">Specifications::Compiler::cast_constant</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">to</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">from</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>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">Kinds::eq</span><span class="plain-syntax">(</span><span class="identifier-syntax">from</span><span class="plain-syntax">, </span><span class="identifier-syntax">K_number</span><span class="plain-syntax">)) && (</span><span class="identifier-syntax">Kinds::eq</span><span class="plain-syntax">(</span><span class="identifier-syntax">to</span><span class="plain-syntax">, </span><span class="identifier-syntax">K_real_number</span><span class="plain-syntax">))) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">wording</span><span class="plain-syntax"> </span><span class="identifier-syntax">W</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Node::get_text</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="function-syntax"><s-literal-real-number></span><span class="plain-syntax">(</span><span class="identifier-syntax">W</span><span class="plain-syntax">)) </span><span class="identifier-syntax">value</span><span class="plain-syntax"> = </span><span class="function-syntax"><<rp>></span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">else</span><span class="plain-syntax"> </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"can't parse integer as real"</span><span class="plain-syntax">);</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">value</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Specifications::Compiler::emit</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>
|
|
<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>
|
|
|
|
<span class="plain-syntax"> </span><span class="constant-syntax">BEGIN_COMPILATION_MODE</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">COMPILATION_MODE_EXIT</span><span class="plain-syntax">(</span><span class="constant-syntax">DEREFERENCE_POINTERS_CMODE</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">COMPILATION_MODE_ENTER</span><span class="plain-syntax">(</span><span class="constant-syntax">CONSTANT_CMODE</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><a href="3-cfs.html#SP5" class="function-link"><span class="function-syntax">Specifications::Compiler::compile_inner</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="plain-syntax"> </span><span class="constant-syntax">END_COMPILATION_MODE</span><span class="plain-syntax">;</span>
|
|
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">inter_ti</span><span class="plain-syntax"> </span><span class="identifier-syntax">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>
|
|
<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>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">Emit::array_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>
|
|
<span class="plain-syntax">}</span>
|
|
|
|
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Specifications::Compiler::emit_as_val</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">Specifications::Compiler::emit_as_val</span></span>:<br/><a href="3-cfs.html#SP7">§7</a><br/>Chronology - <a href="2-chr.html#SP6_4_1">§6.4.1</a><br/>Deciding to Defer - <a href="3-dtd.html#SP6_1_2">§6.1.2</a>, <a href="3-dtd.html#SP14">§14</a>, <a href="3-dtd.html#SP16">§16</a>, <a href="3-dtd.html#SP17">§17</a>, <a href="3-dtd.html#SP19">§19</a>, <a href="3-dtd.html#SP20">§20</a>, <a href="3-dtd.html#SP22">§22</a>, <a href="3-dtd.html#SP23">§23</a>, <a href="3-dtd.html#SP25">§25</a>, <a href="3-dtd.html#SP27">§27</a><br/>Cinders and Deferrals - <a href="3-cad.html#SP3">§3</a><br/>Compile Invocations As Calls - <a href="4-ciac.html#SP2">§2</a><br/>Compile Invocations Inline - <a href="4-cii.html#SP3_1_1_4_9">§3.1.1.4.9</a>, <a href="4-cii.html#SP3_1_1_4_10">§3.1.1.4.10</a>, <a href="4-cii.html#SP8">§8</a><br/>Compile Phrases - <a href="4-cp.html#SP4_3_5">§4.3.5</a>, <a href="4-cp.html#SP4_3_5_1">§4.3.5.1</a><br/>Compile Solutions to Equations - <a href="4-cste.html#SP4">§4</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><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">spec</span><span class="plain-syntax">) {</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">Holsters::new</span><span class="plain-syntax">(</span><span class="identifier-syntax">INTER_VAL_VHMODE</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><a href="3-cfs.html#SP5" class="function-link"><span class="function-syntax">Specifications::Compiler::compile_inner</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="plain-syntax">}</span>
|
|
</pre>
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