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<ul class="crumbs"><li><a href="../webs.html">&#9733;</a></li><li><a href="index.html">core</a></li><li><a href="index.html#21">Chapter 21: Rules and Rulebooks</a></li><li><b>Stacked Variables</b></li></ul><p class="purpose">To permit variables to have scopes intermediate between local and global: for example, to be shared by all rules in a given rulebook.</p>
<ul class="toc"><li><a href="#SP1">&#167;1. Definitions</a></li></ul><hr class="tocbar">
<p class="inwebparagraph"><a id="SP1"></a><b>&#167;1. Definitions. </b></p>
<pre class="display">
<span class="reserved">typedef</span><span class="plain"> </span><span class="reserved">struct</span><span class="plain"> </span><span class="reserved">stacked_variable</span><span class="plain"> {</span>
<span class="reserved">struct</span><span class="plain"> </span><span class="identifier">wording</span><span class="plain"> </span><span class="identifier">name</span><span class="plain">; </span> <span class="comment">text of the name</span>
<span class="reserved">struct</span><span class="plain"> </span><span class="identifier">parse_node</span><span class="plain"> *</span><span class="identifier">assigned_at</span><span class="plain">; </span> <span class="comment">sentence assigning it</span>
<span class="reserved">struct</span><span class="plain"> </span><span class="reserved">nonlocal_variable</span><span class="plain"> *</span><span class="identifier">underlying_var</span><span class="plain">; </span> <span class="comment">the variable in question</span>
<span class="reserved">int</span><span class="plain"> </span><span class="identifier">owner_id</span><span class="plain">; </span> <span class="comment">who owns this</span>
<span class="reserved">int</span><span class="plain"> </span><span class="identifier">offset_in_owning_frame</span><span class="plain">; </span> <span class="comment">word offset of storage (counts from 0)</span>
<span class="reserved">struct</span><span class="plain"> </span><span class="identifier">wording</span><span class="plain"> </span><span class="identifier">match_wording_text</span><span class="plain">; </span> <span class="comment">matching text (relevant for action variables only)</span>
<span class="identifier">MEMORY_MANAGEMENT</span>
<span class="plain">} </span><span class="reserved">stacked_variable</span><span class="plain">;</span>
<span class="reserved">typedef</span><span class="plain"> </span><span class="reserved">struct</span><span class="plain"> </span><span class="reserved">stacked_variable_list</span><span class="plain"> {</span>
<span class="reserved">struct</span><span class="plain"> </span><span class="reserved">stacked_variable</span><span class="plain"> *</span><span class="identifier">the_stv</span><span class="plain">; </span> <span class="comment">the STV</span>
<span class="reserved">struct</span><span class="plain"> </span><span class="reserved">stacked_variable_list</span><span class="plain"> *</span><span class="identifier">next</span><span class="plain">; </span> <span class="comment">in linked list</span>
<span class="identifier">MEMORY_MANAGEMENT</span>
<span class="plain">} </span><span class="reserved">stacked_variable_list</span><span class="plain">;</span>
<span class="reserved">typedef</span><span class="plain"> </span><span class="reserved">struct</span><span class="plain"> </span><span class="reserved">stacked_variable_owner</span><span class="plain"> {</span>
<span class="reserved">int</span><span class="plain"> </span><span class="identifier">no_stvs</span><span class="plain">;</span>
<span class="reserved">int</span><span class="plain"> </span><span class="identifier">recognition_id</span><span class="plain">;</span>
<span class="reserved">struct</span><span class="plain"> </span><span class="reserved">stacked_variable_list</span><span class="plain"> *</span><span class="identifier">list_of_stvs</span><span class="plain">;</span>
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<span class="reserved">struct</span><span class="plain"> </span><span class="identifier">inter_name</span><span class="plain"> *</span><span class="identifier">stvo_iname</span><span class="plain">;</span>
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<span class="identifier">MEMORY_MANAGEMENT</span>
<span class="plain">} </span><span class="reserved">stacked_variable_owner</span><span class="plain">;</span>
<span class="reserved">typedef</span><span class="plain"> </span><span class="reserved">struct</span><span class="plain"> </span><span class="reserved">stacked_variable_owner_list</span><span class="plain"> {</span>
<span class="reserved">struct</span><span class="plain"> </span><span class="reserved">stacked_variable_owner</span><span class="plain"> *</span><span class="identifier">stvo</span><span class="plain">; </span> <span class="comment">the STO</span>
<span class="reserved">struct</span><span class="plain"> </span><span class="reserved">stacked_variable_owner_list</span><span class="plain"> *</span><span class="identifier">next</span><span class="plain">; </span> <span class="comment">in linked list</span>
<span class="identifier">MEMORY_MANAGEMENT</span>
<span class="plain">} </span><span class="reserved">stacked_variable_owner_list</span><span class="plain">;</span>
</pre>
<p class="inwebparagraph"></p>
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<p class="endnote">The structure stacked_variable is accessed in 2/sq, 2/si, 5/ins, 5/nv, 8/ef, 9/ma, 9/pk, 11/sm, 14/lv, 14/ds2, 15/pr, 15/ep, 15/vp, 15/spr, 16/in, 16/cmw, 17/rs, 19/tc, 19/tb, 19/tod, 20/eq, 21/rl, 21/rl2, 21/fao, 21/rps, 21/ac, 22/pu, 22/dptd, 22/po, 22/pav, 25/cii, 26/uo, 26/ts and here.</p>
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<p class="endnote">The structure stacked_variable_list is accessed in 3/pd, 5/lp, 5/ut, 5/un, 5/ins, 6/rlt, 6/nv, 7/ns, 7/oaf, 7/rs, 9/tfa, 9/tbath, 9/rpt, 9/tc, 9/ma, 9/rk, 9/ass, 9/imp, 9/pd, 10/teav, 10/cap, 11/ap, 11/pr, 11/bas, 11/tc, 11/sm, 12/dtd, 12/cdp, 14/rv, 14/lv, 14/cn, 14/ds, 14/ds2, 15/cp, 16/is, 16/in, 19/tb, 19/rsft, 19/tod, 20/eq, 21/rl, 21/rl2, 21/fao, 21/rps, 21/ac, 22/ph, 22/tp, 22/tp2, 23/ad, 24/lv, 24/sf, 25/in, 25/pi, 25/cii, 25/cp, 26/uo, 26/tti, 26/pc, 26/ts, 27/cm and here.</p>
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<p class="endnote">The structure stacked_variable_owner is private to this section.</p>
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<p class="endnote">The structure stacked_variable_owner_list is accessed in 3/pd, 5/lp, 5/ut, 5/un, 5/ins, 6/rlt, 6/nv, 7/ns, 7/oaf, 7/rs, 9/tfa, 9/tbath, 9/rpt, 9/tc, 9/ma, 9/rk, 9/ass, 9/imp, 9/pd, 10/teav, 10/cap, 11/ap, 11/pr, 11/bas, 11/tc, 11/sm, 12/dtd, 12/cdp, 14/rv, 14/lv, 14/cn, 14/ds, 14/ds2, 15/cp, 16/is, 16/in, 19/tb, 19/rsft, 19/tod, 20/eq, 21/rl, 21/rl2, 21/fao, 21/rps, 21/ac, 22/ph, 22/tp, 22/tp2, 23/ad, 24/lv, 24/sf, 25/in, 25/pi, 25/cii, 25/cp, 26/uo, 26/tti, 26/pc, 26/ts, 27/cm and here.</p>
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<p class="inwebparagraph"><a id="SP2"></a><b>&#167;2. </b></p>
<pre class="display">
<span class="reserved">int</span><span class="plain"> </span><span class="identifier">max_frame_size_needed</span><span class="plain"> = 0;</span>
</pre>
<p class="inwebparagraph"></p>
<p class="inwebparagraph"><a id="SP3"></a><b>&#167;3. </b></p>
<pre class="display">
<span class="reserved">nonlocal_variable_emission</span><span class="plain"> </span><span class="functiontext">StackedVariables::how_to_lvalue</span><span class="plain">(</span><span class="reserved">stacked_variable</span><span class="plain"> *</span><span class="identifier">stv</span><span class="plain">) {</span>
<span class="reserved">if</span><span class="plain"> ((</span><span class="identifier">stv</span><span class="plain">-</span><span class="element">&gt;owner_id</span><span class="plain"> == </span><span class="constant">ACTION_PROCESSING_RB</span><span class="plain">) &amp;&amp; (</span><span class="identifier">stv</span><span class="plain">-</span><span class="element">&gt;offset_in_owning_frame</span><span class="plain"> == 0))</span>
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<span class="reserved">return</span><span class="plain"> </span><span class="functiontext">NonlocalVariables::nve_from_iname</span><span class="plain">(</span><span class="functiontext">Hierarchy::find</span><span class="plain">(</span><span class="constant">ACTOR_HL</span><span class="plain">));</span>
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<span class="reserved">else</span>
<span class="reserved">return</span><span class="plain"> </span><span class="functiontext">NonlocalVariables::nve_from_mstack</span><span class="plain">(</span><span class="identifier">stv</span><span class="plain">-</span><span class="element">&gt;owner_id</span><span class="plain">, </span><span class="identifier">stv</span><span class="plain">-</span><span class="element">&gt;offset_in_owning_frame</span><span class="plain">, </span><span class="identifier">FALSE</span><span class="plain">);</span>
<span class="plain">}</span>
<span class="reserved">nonlocal_variable_emission</span><span class="plain"> </span><span class="functiontext">StackedVariables::how_to_rvalue</span><span class="plain">(</span><span class="reserved">stacked_variable</span><span class="plain"> *</span><span class="identifier">stv</span><span class="plain">) {</span>
<span class="reserved">if</span><span class="plain"> ((</span><span class="identifier">stv</span><span class="plain">-</span><span class="element">&gt;owner_id</span><span class="plain"> == </span><span class="constant">ACTION_PROCESSING_RB</span><span class="plain">) &amp;&amp; (</span><span class="identifier">stv</span><span class="plain">-</span><span class="element">&gt;offset_in_owning_frame</span><span class="plain"> == 0))</span>
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<span class="reserved">return</span><span class="plain"> </span><span class="functiontext">NonlocalVariables::nve_from_iname</span><span class="plain">(</span><span class="functiontext">Hierarchy::find</span><span class="plain">(</span><span class="constant">ACTOR_HL</span><span class="plain">));</span>
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<span class="reserved">else</span>
<span class="reserved">return</span><span class="plain"> </span><span class="functiontext">NonlocalVariables::nve_from_mstack</span><span class="plain">(</span><span class="identifier">stv</span><span class="plain">-</span><span class="element">&gt;owner_id</span><span class="plain">, </span><span class="identifier">stv</span><span class="plain">-</span><span class="element">&gt;offset_in_owning_frame</span><span class="plain">, </span><span class="identifier">TRUE</span><span class="plain">);</span>
<span class="plain">}</span>
<span class="reserved">int</span><span class="plain"> </span><span class="functiontext">StackedVariables::get_owner_id</span><span class="plain">(</span><span class="reserved">stacked_variable</span><span class="plain"> *</span><span class="identifier">stv</span><span class="plain">) {</span>
<span class="reserved">return</span><span class="plain"> </span><span class="identifier">stv</span><span class="plain">-</span><span class="element">&gt;owner_id</span><span class="plain">;</span>
<span class="plain">}</span>
<span class="reserved">int</span><span class="plain"> </span><span class="functiontext">StackedVariables::get_offset</span><span class="plain">(</span><span class="reserved">stacked_variable</span><span class="plain"> *</span><span class="identifier">stv</span><span class="plain">) {</span>
<span class="reserved">return</span><span class="plain"> </span><span class="identifier">stv</span><span class="plain">-</span><span class="element">&gt;offset_in_owning_frame</span><span class="plain">;</span>
<span class="plain">}</span>
<span class="identifier">kind</span><span class="plain"> *</span><span class="functiontext">StackedVariables::get_kind</span><span class="plain">(</span><span class="reserved">stacked_variable</span><span class="plain"> *</span><span class="identifier">stv</span><span class="plain">) {</span>
<span class="reserved">nonlocal_variable</span><span class="plain"> *</span><span class="identifier">nlv</span><span class="plain"> = </span><span class="functiontext">StackedVariables::get_variable</span><span class="plain">(</span><span class="identifier">stv</span><span class="plain">);</span>
<span class="reserved">return</span><span class="plain"> </span><span class="functiontext">NonlocalVariables::kind</span><span class="plain">(</span><span class="identifier">nlv</span><span class="plain">);</span>
<span class="plain">}</span>
<span class="reserved">nonlocal_variable</span><span class="plain"> *</span><span class="functiontext">StackedVariables::get_variable</span><span class="plain">(</span><span class="reserved">stacked_variable</span><span class="plain"> *</span><span class="identifier">stv</span><span class="plain">) {</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">stv</span><span class="plain"> == </span><span class="identifier">NULL</span><span class="plain">) </span><span class="reserved">return</span><span class="plain"> </span><span class="identifier">NULL</span><span class="plain">;</span>
<span class="reserved">return</span><span class="plain"> </span><span class="identifier">stv</span><span class="plain">-</span><span class="element">&gt;underlying_var</span><span class="plain">;</span>
<span class="plain">}</span>
<span class="reserved">void</span><span class="plain"> </span><span class="functiontext">StackedVariables::set_matching_text</span><span class="plain">(</span><span class="reserved">stacked_variable</span><span class="plain"> *</span><span class="identifier">stv</span><span class="plain">, </span><span class="identifier">wording</span><span class="plain"> </span><span class="identifier">W</span><span class="plain">) {</span>
<span class="identifier">stv</span><span class="plain">-</span><span class="element">&gt;match_wording_text</span><span class="plain"> = </span><span class="identifier">W</span><span class="plain">;</span>
<span class="plain">}</span>
<span class="identifier">wording</span><span class="plain"> </span><span class="functiontext">StackedVariables::get_matching_text</span><span class="plain">(</span><span class="reserved">stacked_variable</span><span class="plain"> *</span><span class="identifier">stv</span><span class="plain">) {</span>
<span class="reserved">return</span><span class="plain"> </span><span class="identifier">stv</span><span class="plain">-</span><span class="element">&gt;match_wording_text</span><span class="plain">;</span>
<span class="plain">}</span>
<span class="reserved">stacked_variable</span><span class="plain"> *</span><span class="functiontext">StackedVariables::parse_match_clause</span><span class="plain">(</span><span class="reserved">stacked_variable_owner</span><span class="plain"> *</span><span class="identifier">stvo</span><span class="plain">,</span>
<span class="identifier">wording</span><span class="plain"> </span><span class="identifier">W</span><span class="plain">) {</span>
<span class="reserved">for</span><span class="plain"> (</span><span class="reserved">stacked_variable_list</span><span class="plain"> *</span><span class="identifier">stvl</span><span class="plain"> = </span><span class="identifier">stvo</span><span class="plain">-</span><span class="element">&gt;list_of_stvs</span><span class="plain">; </span><span class="identifier">stvl</span><span class="plain">; </span><span class="identifier">stvl</span><span class="plain"> = </span><span class="identifier">stvl</span><span class="plain">-</span><span class="element">&gt;next</span><span class="plain">)</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">Wordings::starts_with</span><span class="plain">(</span><span class="identifier">W</span><span class="plain">, </span><span class="identifier">stvl</span><span class="plain">-</span><span class="element">&gt;the_stv</span><span class="plain">-</span><span class="element">&gt;match_wording_text</span><span class="plain">))</span>
<span class="reserved">return</span><span class="plain"> </span><span class="identifier">stvl</span><span class="plain">-</span><span class="element">&gt;the_stv</span><span class="plain">;</span>
<span class="reserved">return</span><span class="plain"> </span><span class="identifier">NULL</span><span class="plain">;</span>
<span class="plain">}</span>
<span class="reserved">stacked_variable_owner</span><span class="plain"> *</span><span class="functiontext">StackedVariables::new_owner</span><span class="plain">(</span><span class="reserved">int</span><span class="plain"> </span><span class="identifier">id</span><span class="plain">) {</span>
<span class="reserved">stacked_variable_owner</span><span class="plain"> *</span><span class="identifier">stvo</span><span class="plain"> = </span><span class="identifier">CREATE</span><span class="plain">(</span><span class="reserved">stacked_variable_owner</span><span class="plain">);</span>
<span class="identifier">stvo</span><span class="plain">-</span><span class="element">&gt;recognition_id</span><span class="plain"> = </span><span class="identifier">id</span><span class="plain">;</span>
<span class="identifier">stvo</span><span class="plain">-</span><span class="element">&gt;no_stvs</span><span class="plain"> = 0;</span>
<span class="identifier">stvo</span><span class="plain">-</span><span class="element">&gt;list_of_stvs</span><span class="plain"> = </span><span class="identifier">NULL</span><span class="plain">;</span>
<span class="identifier">stvo</span><span class="plain">-</span><span class="element">&gt;stvo_iname</span><span class="plain"> = </span><span class="identifier">NULL</span><span class="plain">;</span>
<span class="reserved">return</span><span class="plain"> </span><span class="identifier">stvo</span><span class="plain">;</span>
<span class="plain">}</span>
<span class="reserved">int</span><span class="plain"> </span><span class="functiontext">StackedVariables::owner_empty</span><span class="plain">(</span><span class="reserved">stacked_variable_owner</span><span class="plain"> *</span><span class="identifier">stvo</span><span class="plain">) {</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">stvo</span><span class="plain">-</span><span class="element">&gt;no_stvs</span><span class="plain"> == 0) </span><span class="reserved">return</span><span class="plain"> </span><span class="identifier">TRUE</span><span class="plain">;</span>
<span class="reserved">return</span><span class="plain"> </span><span class="identifier">FALSE</span><span class="plain">;</span>
<span class="plain">}</span>
<span class="reserved">stacked_variable</span><span class="plain"> *</span><span class="functiontext">StackedVariables::add_empty</span><span class="plain">(</span><span class="reserved">stacked_variable_owner</span><span class="plain"> *</span><span class="identifier">stvo</span><span class="plain">,</span>
<span class="identifier">wording</span><span class="plain"> </span><span class="identifier">W</span><span class="plain">, </span><span class="identifier">kind</span><span class="plain"> *</span><span class="identifier">K</span><span class="plain">) {</span>
<span class="reserved">stacked_variable</span><span class="plain"> *</span><span class="identifier">stv</span><span class="plain"> = </span><span class="identifier">CREATE</span><span class="plain">(</span><span class="reserved">stacked_variable</span><span class="plain">);</span>
<span class="reserved">nonlocal_variable</span><span class="plain"> *</span><span class="identifier">q</span><span class="plain">;</span>
<span class="identifier">W</span><span class="plain"> = </span><span class="identifier">Articles::remove_the</span><span class="plain">(</span><span class="identifier">W</span><span class="plain">);</span>
<span class="identifier">stv</span><span class="plain">-</span><span class="element">&gt;name</span><span class="plain"> = </span><span class="identifier">W</span><span class="plain">;</span>
<span class="identifier">stv</span><span class="plain">-</span><span class="element">&gt;owner_id</span><span class="plain"> = </span><span class="identifier">stvo</span><span class="plain">-</span><span class="element">&gt;recognition_id</span><span class="plain">;</span>
<span class="identifier">stv</span><span class="plain">-</span><span class="element">&gt;offset_in_owning_frame</span><span class="plain"> = </span><span class="identifier">stvo</span><span class="plain">-</span><span class="element">&gt;no_stvs</span><span class="plain">++;</span>
<span class="identifier">stv</span><span class="plain">-</span><span class="element">&gt;assigned_at</span><span class="plain"> = </span><span class="identifier">current_sentence</span><span class="plain">;</span>
<span class="identifier">stv</span><span class="plain">-</span><span class="element">&gt;match_wording_text</span><span class="plain"> = </span><span class="identifier">EMPTY_WORDING</span><span class="plain">;</span>
<span class="identifier">stvo</span><span class="plain">-</span><span class="element">&gt;list_of_stvs</span><span class="plain"> = </span><span class="functiontext">StackedVariables::add_to_list</span><span class="plain">(</span><span class="identifier">stvo</span><span class="plain">-</span><span class="element">&gt;list_of_stvs</span><span class="plain">, </span><span class="identifier">stv</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">stvo</span><span class="plain">-</span><span class="element">&gt;no_stvs</span><span class="plain"> &gt; </span><span class="identifier">max_frame_size_needed</span><span class="plain">)</span>
<span class="identifier">max_frame_size_needed</span><span class="plain"> = </span><span class="identifier">stvo</span><span class="plain">-</span><span class="element">&gt;no_stvs</span><span class="plain">;</span>
<span class="identifier">q</span><span class="plain"> = </span><span class="functiontext">NonlocalVariables::new_stacked</span><span class="plain">(</span><span class="identifier">W</span><span class="plain">, </span><span class="identifier">K</span><span class="plain">, </span><span class="identifier">stv</span><span class="plain">);</span>
<span class="identifier">stv</span><span class="plain">-</span><span class="element">&gt;underlying_var</span><span class="plain"> = </span><span class="identifier">q</span><span class="plain">;</span>
<span class="functiontext">NonlocalVariables::set_I6_identifier</span><span class="plain">(</span><span class="identifier">q</span><span class="plain">, </span><span class="identifier">FALSE</span><span class="plain">, </span><span class="functiontext">StackedVariables::how_to_rvalue</span><span class="plain">(</span><span class="identifier">stv</span><span class="plain">));</span>
<span class="functiontext">NonlocalVariables::set_I6_identifier</span><span class="plain">(</span><span class="identifier">q</span><span class="plain">, </span><span class="identifier">TRUE</span><span class="plain">, </span><span class="functiontext">StackedVariables::how_to_lvalue</span><span class="plain">(</span><span class="identifier">stv</span><span class="plain">));</span>
<span class="reserved">return</span><span class="plain"> </span><span class="identifier">stv</span><span class="plain">;</span>
<span class="plain">}</span>
<span class="reserved">stacked_variable_owner_list</span><span class="plain"> *</span><span class="functiontext">StackedVariables::add_owner_to_list</span><span class="plain">(</span><span class="reserved">stacked_variable_owner_list</span><span class="plain"> *</span><span class="identifier">stvol</span><span class="plain">,</span>
<span class="reserved">stacked_variable_owner</span><span class="plain"> *</span><span class="identifier">stvo</span><span class="plain">) {</span>
<span class="reserved">stacked_variable_owner_list</span><span class="plain"> *</span><span class="identifier">ostvol</span><span class="plain"> = </span><span class="identifier">stvol</span><span class="plain">;</span>
<span class="reserved">while</span><span class="plain"> (</span><span class="identifier">stvol</span><span class="plain">) {</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">stvol</span><span class="plain">-</span><span class="element">&gt;stvo</span><span class="plain"> == </span><span class="identifier">stvo</span><span class="plain">) </span><span class="reserved">return</span><span class="plain"> </span><span class="identifier">ostvol</span><span class="plain">;</span>
<span class="reserved">stacked_variable_owner_list</span><span class="plain"> *</span><span class="identifier">nxt</span><span class="plain"> = </span><span class="identifier">stvol</span><span class="plain">-</span><span class="element">&gt;next</span><span class="plain">;</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">nxt</span><span class="plain"> == </span><span class="identifier">NULL</span><span class="plain">) </span><span class="reserved">break</span><span class="plain">;</span>
<span class="identifier">stvol</span><span class="plain"> = </span><span class="identifier">nxt</span><span class="plain">;</span>
<span class="plain">}</span>
<span class="reserved">stacked_variable_owner_list</span><span class="plain"> *</span><span class="identifier">nstvol</span><span class="plain"> = </span><span class="identifier">CREATE</span><span class="plain">(</span><span class="reserved">stacked_variable_owner_list</span><span class="plain">);</span>
<span class="identifier">nstvol</span><span class="plain">-</span><span class="element">&gt;next</span><span class="plain"> = </span><span class="identifier">NULL</span><span class="plain">;</span>
<span class="identifier">nstvol</span><span class="plain">-</span><span class="element">&gt;stvo</span><span class="plain"> = </span><span class="identifier">stvo</span><span class="plain">;</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">stvol</span><span class="plain"> == </span><span class="identifier">NULL</span><span class="plain">) </span><span class="reserved">return</span><span class="plain"> </span><span class="identifier">nstvol</span><span class="plain">;</span>
<span class="identifier">stvol</span><span class="plain">-</span><span class="element">&gt;next</span><span class="plain"> = </span><span class="identifier">nstvol</span><span class="plain">;</span>
<span class="reserved">return</span><span class="plain"> </span><span class="identifier">ostvol</span><span class="plain">;</span>
<span class="plain">}</span>
<span class="reserved">stacked_variable_owner_list</span><span class="plain"> *</span><span class="functiontext">StackedVariables::append_owner_list</span><span class="plain">(</span><span class="reserved">stacked_variable_owner_list</span><span class="plain"> *</span><span class="identifier">stvol</span><span class="plain">,</span>
<span class="reserved">stacked_variable_owner_list</span><span class="plain"> *</span><span class="identifier">extras</span><span class="plain">) {</span>
<span class="identifier">LOGIF</span><span class="plain">(</span><span class="identifier">RULEBOOK_COMPILATION</span><span class="plain">,</span>
<span class="string">"Appending list %08x to list %08x\</span><span class="plain">n</span><span class="string">"</span><span class="plain">, (</span><span class="reserved">int</span><span class="plain">) </span><span class="identifier">extras</span><span class="plain">, (</span><span class="reserved">int</span><span class="plain">) </span><span class="identifier">stvol</span><span class="plain">);</span>
<span class="reserved">stacked_variable_owner_list</span><span class="plain"> *</span><span class="identifier">new_head</span><span class="plain"> = </span><span class="identifier">stvol</span><span class="plain">;</span>
<span class="reserved">for</span><span class="plain"> (; </span><span class="identifier">extras</span><span class="plain">; </span><span class="identifier">extras</span><span class="plain"> = </span><span class="identifier">extras</span><span class="plain">-</span><span class="element">&gt;next</span><span class="plain">)</span>
<span class="identifier">new_head</span><span class="plain"> = </span><span class="functiontext">StackedVariables::add_owner_to_list</span><span class="plain">(</span><span class="identifier">new_head</span><span class="plain">, </span><span class="identifier">extras</span><span class="plain">-</span><span class="element">&gt;stvo</span><span class="plain">);</span>
<span class="reserved">return</span><span class="plain"> </span><span class="identifier">new_head</span><span class="plain">;</span>
<span class="plain">}</span>
<span class="reserved">int</span><span class="plain"> </span><span class="functiontext">StackedVariables::list_length</span><span class="plain">(</span><span class="reserved">stacked_variable_list</span><span class="plain"> *</span><span class="identifier">stvl</span><span class="plain">) {</span>
<span class="reserved">int</span><span class="plain"> </span><span class="identifier">l</span><span class="plain"> = 0;</span>
<span class="reserved">while</span><span class="plain"> (</span><span class="identifier">stvl</span><span class="plain">) {</span>
<span class="identifier">l</span><span class="plain">++;</span>
<span class="identifier">stvl</span><span class="plain"> = </span><span class="identifier">stvl</span><span class="plain">-</span><span class="element">&gt;next</span><span class="plain">;</span>
<span class="plain">}</span>
<span class="reserved">return</span><span class="plain"> </span><span class="identifier">l</span><span class="plain">;</span>
<span class="plain">}</span>
<span class="reserved">void</span><span class="plain"> </span><span class="functiontext">StackedVariables::index_owner</span><span class="plain">(</span><span class="identifier">OUTPUT_STREAM</span><span class="plain">, </span><span class="reserved">stacked_variable_owner</span><span class="plain"> *</span><span class="identifier">stvo</span><span class="plain">) {</span>
<span class="reserved">stacked_variable_list</span><span class="plain"> *</span><span class="identifier">stvl</span><span class="plain">;</span>
<span class="reserved">for</span><span class="plain"> (</span><span class="identifier">stvl</span><span class="plain">=</span><span class="identifier">stvo</span><span class="plain">-</span><span class="element">&gt;list_of_stvs</span><span class="plain">; </span><span class="identifier">stvl</span><span class="plain">; </span><span class="identifier">stvl</span><span class="plain"> = </span><span class="identifier">stvl</span><span class="plain">-</span><span class="element">&gt;next</span><span class="plain">)</span>
<span class="reserved">if</span><span class="plain"> ((</span><span class="identifier">stvl</span><span class="plain">-</span><span class="element">&gt;the_stv</span><span class="plain">) &amp;&amp; (</span><span class="identifier">stvl</span><span class="plain">-</span><span class="element">&gt;the_stv</span><span class="plain">-</span><span class="element">&gt;underlying_var</span><span class="plain">)) {</span>
<span class="identifier">HTMLFiles::open_para</span><span class="plain">(</span><span class="identifier">OUT</span><span class="plain">, 2, </span><span class="string">"tight"</span><span class="plain">);</span>
<span class="functiontext">NonlocalVariables::index_single</span><span class="plain">(</span><span class="identifier">OUT</span><span class="plain">, </span><span class="identifier">stvl</span><span class="plain">-</span><span class="element">&gt;the_stv</span><span class="plain">-</span><span class="element">&gt;underlying_var</span><span class="plain">);</span>
<span class="identifier">HTML_CLOSE</span><span class="plain">(</span><span class="string">"p"</span><span class="plain">);</span>
<span class="plain">}</span>
<span class="plain">}</span>
<span class="reserved">stacked_variable</span><span class="plain"> *</span><span class="functiontext">StackedVariables::parse_from_owner_list</span><span class="plain">(</span><span class="reserved">stacked_variable_owner_list</span><span class="plain"> *</span><span class="identifier">stvol</span><span class="plain">, </span><span class="identifier">wording</span><span class="plain"> </span><span class="identifier">W</span><span class="plain">) {</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">Wordings::empty</span><span class="plain">(</span><span class="identifier">W</span><span class="plain">)) </span><span class="reserved">return</span><span class="plain"> </span><span class="identifier">NULL</span><span class="plain">;</span>
<span class="identifier">W</span><span class="plain"> = </span><span class="identifier">Articles::remove_the</span><span class="plain">(</span><span class="identifier">W</span><span class="plain">);</span>
<span class="reserved">while</span><span class="plain"> (</span><span class="identifier">stvol</span><span class="plain">) {</span>
<span class="reserved">stacked_variable</span><span class="plain"> *</span><span class="identifier">stv</span><span class="plain"> = </span><span class="identifier">NULL</span><span class="plain">;</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">stvol</span><span class="plain">-</span><span class="element">&gt;stvo</span><span class="plain">) </span><span class="identifier">stv</span><span class="plain"> = </span><span class="functiontext">StackedVariables::parse_from_list</span><span class="plain">(</span><span class="identifier">stvol</span><span class="plain">-</span><span class="element">&gt;stvo</span><span class="plain">-</span><span class="element">&gt;list_of_stvs</span><span class="plain">, </span><span class="identifier">W</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">stv</span><span class="plain">) </span><span class="reserved">return</span><span class="plain"> </span><span class="identifier">stv</span><span class="plain">;</span>
<span class="identifier">stvol</span><span class="plain"> = </span><span class="identifier">stvol</span><span class="plain">-</span><span class="element">&gt;next</span><span class="plain">;</span>
<span class="plain">}</span>
<span class="reserved">return</span><span class="plain"> </span><span class="identifier">NULL</span><span class="plain">;</span>
<span class="plain">}</span>
<span class="reserved">stacked_variable</span><span class="plain"> *</span><span class="functiontext">StackedVariables::parse_from_list</span><span class="plain">(</span><span class="reserved">stacked_variable_list</span><span class="plain"> *</span><span class="identifier">stvl</span><span class="plain">, </span><span class="identifier">wording</span><span class="plain"> </span><span class="identifier">W</span><span class="plain">) {</span>
<span class="reserved">while</span><span class="plain"> (</span><span class="identifier">stvl</span><span class="plain">) {</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">Wordings::match</span><span class="plain">(</span><span class="identifier">stvl</span><span class="plain">-</span><span class="element">&gt;the_stv</span><span class="plain">-</span><span class="element">&gt;name</span><span class="plain">, </span><span class="identifier">W</span><span class="plain">))</span>
<span class="reserved">return</span><span class="plain"> </span><span class="identifier">stvl</span><span class="plain">-</span><span class="element">&gt;the_stv</span><span class="plain">;</span>
<span class="identifier">stvl</span><span class="plain"> = </span><span class="identifier">stvl</span><span class="plain">-</span><span class="element">&gt;next</span><span class="plain">;</span>
<span class="plain">}</span>
<span class="reserved">return</span><span class="plain"> </span><span class="identifier">NULL</span><span class="plain">;</span>
<span class="plain">}</span>
<span class="reserved">stacked_variable_list</span><span class="plain"> *</span><span class="functiontext">StackedVariables::add_to_list</span><span class="plain">(</span><span class="reserved">stacked_variable_list</span><span class="plain"> *</span><span class="identifier">stvl</span><span class="plain">,</span>
<span class="reserved">stacked_variable</span><span class="plain"> *</span><span class="identifier">stv</span><span class="plain">) {</span>
<span class="reserved">stacked_variable_list</span><span class="plain"> *</span><span class="identifier">nstvl</span><span class="plain"> = </span><span class="identifier">CREATE</span><span class="plain">(</span><span class="reserved">stacked_variable_list</span><span class="plain">), *</span><span class="identifier">ostvl</span><span class="plain"> = </span><span class="identifier">stvl</span><span class="plain">;</span>
<span class="identifier">nstvl</span><span class="plain">-</span><span class="element">&gt;the_stv</span><span class="plain"> = </span><span class="identifier">stv</span><span class="plain">;</span>
<span class="identifier">nstvl</span><span class="plain">-</span><span class="element">&gt;next</span><span class="plain"> = </span><span class="identifier">NULL</span><span class="plain">;</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">stvl</span><span class="plain"> == </span><span class="identifier">NULL</span><span class="plain">) </span><span class="reserved">return</span><span class="plain"> </span><span class="identifier">nstvl</span><span class="plain">;</span>
<span class="reserved">while</span><span class="plain"> (</span><span class="identifier">stvl</span><span class="plain">-</span><span class="element">&gt;next</span><span class="plain">) </span><span class="identifier">stvl</span><span class="plain"> = </span><span class="identifier">stvl</span><span class="plain">-</span><span class="element">&gt;next</span><span class="plain">;</span>
<span class="identifier">stvl</span><span class="plain">-</span><span class="element">&gt;next</span><span class="plain"> = </span><span class="identifier">nstvl</span><span class="plain">;</span>
<span class="reserved">return</span><span class="plain"> </span><span class="identifier">ostvl</span><span class="plain">;</span>
<span class="plain">}</span>
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<span class="reserved">int</span><span class="plain"> </span><span class="functiontext">StackedVariables::compile_frame_creator</span><span class="plain">(</span><span class="reserved">stacked_variable_owner</span><span class="plain"> *</span><span class="identifier">stvo</span><span class="plain">, </span><span class="identifier">inter_name</span><span class="plain"> *</span><span class="identifier">iname</span><span class="plain">) {</span>
2019-03-17 14:40:57 +02:00
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">stvo</span><span class="plain"> == </span><span class="identifier">NULL</span><span class="plain">) </span><span class="reserved">return</span><span class="plain"> 0;</span>
2019-08-24 13:21:48 +03:00
<span class="identifier">packaging_state</span><span class="plain"> </span><span class="identifier">save</span><span class="plain"> = </span><span class="functiontext">Routines::begin</span><span class="plain">(</span><span class="identifier">iname</span><span class="plain">);</span>
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<span class="identifier">inter_symbol</span><span class="plain"> *</span><span class="identifier">pos_s</span><span class="plain"> = </span><span class="functiontext">LocalVariables::add_named_call_as_symbol</span><span class="plain">(</span><span class="identifier">I</span><span class="string">"pos"</span><span class="plain">);</span>
<span class="identifier">inter_symbol</span><span class="plain"> *</span><span class="identifier">state_s</span><span class="plain"> = </span><span class="functiontext">LocalVariables::add_named_call_as_symbol</span><span class="plain">(</span><span class="identifier">I</span><span class="string">"state"</span><span class="plain">);</span>
<span class="identifier">Produce::inv_primitive</span><span class="plain">(</span><span class="functiontext">Emit::tree</span><span class="plain">(), </span><span class="identifier">IFELSE_BIP</span><span class="plain">);</span>
<span class="identifier">Produce::down</span><span class="plain">(</span><span class="functiontext">Emit::tree</span><span class="plain">());</span>
<span class="identifier">Produce::inv_primitive</span><span class="plain">(</span><span class="functiontext">Emit::tree</span><span class="plain">(), </span><span class="identifier">EQ_BIP</span><span class="plain">);</span>
<span class="identifier">Produce::down</span><span class="plain">(</span><span class="functiontext">Emit::tree</span><span class="plain">());</span>
<span class="identifier">Produce::val_symbol</span><span class="plain">(</span><span class="functiontext">Emit::tree</span><span class="plain">(), </span><span class="identifier">K_value</span><span class="plain">, </span><span class="identifier">state_s</span><span class="plain">);</span>
<span class="identifier">Produce::val</span><span class="plain">(</span><span class="functiontext">Emit::tree</span><span class="plain">(), </span><span class="identifier">K_number</span><span class="plain">, </span><span class="identifier">LITERAL_IVAL</span><span class="plain">, 1);</span>
<span class="identifier">Produce::up</span><span class="plain">(</span><span class="functiontext">Emit::tree</span><span class="plain">());</span>
<span class="identifier">Produce::code</span><span class="plain">(</span><span class="functiontext">Emit::tree</span><span class="plain">());</span>
<span class="identifier">Produce::down</span><span class="plain">(</span><span class="functiontext">Emit::tree</span><span class="plain">());</span>
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&lt;<span class="cwebmacro">Compile frame creator if state is set</span> <span class="cwebmacronumber">3.1</span>&gt;<span class="plain">;</span>
<span class="identifier">Produce::up</span><span class="plain">(</span><span class="functiontext">Emit::tree</span><span class="plain">());</span>
<span class="identifier">Produce::code</span><span class="plain">(</span><span class="functiontext">Emit::tree</span><span class="plain">());</span>
<span class="identifier">Produce::down</span><span class="plain">(</span><span class="functiontext">Emit::tree</span><span class="plain">());</span>
2019-03-17 14:40:57 +02:00
&lt;<span class="cwebmacro">Compile frame creator if state is clear</span> <span class="cwebmacronumber">3.2</span>&gt;<span class="plain">;</span>
<span class="identifier">Produce::up</span><span class="plain">(</span><span class="functiontext">Emit::tree</span><span class="plain">());</span>
<span class="identifier">Produce::up</span><span class="plain">(</span><span class="functiontext">Emit::tree</span><span class="plain">());</span>
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<span class="reserved">int</span><span class="plain"> </span><span class="identifier">count</span><span class="plain"> = 0;</span>
<span class="reserved">for</span><span class="plain"> (</span><span class="reserved">stacked_variable_list</span><span class="plain"> *</span><span class="identifier">stvl</span><span class="plain"> = </span><span class="identifier">stvo</span><span class="plain">-</span><span class="element">&gt;list_of_stvs</span><span class="plain">; </span><span class="identifier">stvl</span><span class="plain">; </span><span class="identifier">stvl</span><span class="plain"> = </span><span class="identifier">stvl</span><span class="plain">-</span><span class="element">&gt;next</span><span class="plain">) </span><span class="identifier">count</span><span class="plain">++;</span>
<span class="identifier">Produce::inv_primitive</span><span class="plain">(</span><span class="functiontext">Emit::tree</span><span class="plain">(), </span><span class="identifier">RETURN_BIP</span><span class="plain">);</span>
<span class="identifier">Produce::down</span><span class="plain">(</span><span class="functiontext">Emit::tree</span><span class="plain">());</span>
<span class="identifier">Produce::val</span><span class="plain">(</span><span class="functiontext">Emit::tree</span><span class="plain">(), </span><span class="identifier">K_number</span><span class="plain">, </span><span class="identifier">LITERAL_IVAL</span><span class="plain">, (</span><span class="identifier">inter_t</span><span class="plain">) </span><span class="identifier">count</span><span class="plain">);</span>
<span class="identifier">Produce::up</span><span class="plain">(</span><span class="functiontext">Emit::tree</span><span class="plain">());</span>
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<span class="functiontext">Routines::end</span><span class="plain">(</span><span class="identifier">save</span><span class="plain">);</span>
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<span class="identifier">stvo</span><span class="plain">-</span><span class="element">&gt;stvo_iname</span><span class="plain"> = </span><span class="identifier">iname</span><span class="plain">;</span>
<span class="reserved">return</span><span class="plain"> </span><span class="identifier">count</span><span class="plain">;</span>
<span class="plain">}</span>
</pre>
<p class="inwebparagraph"></p>
<p class="endnote">The function StackedVariables::how_to_lvalue appears nowhere else.</p>
<p class="endnote">The function StackedVariables::how_to_rvalue appears nowhere else.</p>
<p class="endnote">The function StackedVariables::get_owner_id appears nowhere else.</p>
<p class="endnote">The function StackedVariables::get_offset appears nowhere else.</p>
<p class="endnote">The function StackedVariables::get_kind appears nowhere else.</p>
<p class="endnote">The function StackedVariables::get_variable is used in <a href="#SP3_1">&#167;3.1</a>, <a href="#SP3_2">&#167;3.2</a>, 10/teav (<a href="10-teav.html#SP16">&#167;16</a>).</p>
<p class="endnote">The function StackedVariables::set_matching_text appears nowhere else.</p>
<p class="endnote">The function StackedVariables::get_matching_text appears nowhere else.</p>
<p class="endnote">The function StackedVariables::parse_match_clause appears nowhere else.</p>
<p class="endnote">The function StackedVariables::new_owner is used in 21/rl2 (<a href="21-rl2.html#SP10">&#167;10</a>), 21/ac (<a href="21-ac.html#SP6">&#167;6</a>).</p>
<p class="endnote">The function StackedVariables::owner_empty is used in 21/rl2 (<a href="21-rl2.html#SP14">&#167;14</a>, <a href="21-rl2.html#SP14_1">&#167;14.1</a>), 21/ac (<a href="21-ac.html#SP8">&#167;8</a>).</p>
<p class="endnote">The function StackedVariables::add_empty is used in 21/rl2 (<a href="21-rl2.html#SP14">&#167;14</a>), 21/ac (<a href="21-ac.html#SP8">&#167;8</a>).</p>
<p class="endnote">The function StackedVariables::add_owner_to_list is used in 21/rl2 (<a href="21-rl2.html#SP10">&#167;10</a>, <a href="21-rl2.html#SP14">&#167;14</a>).</p>
<p class="endnote">The function StackedVariables::append_owner_list is used in 21/rl (<a href="21-rl.html#SP16">&#167;16</a>).</p>
<p class="endnote">The function StackedVariables::list_length appears nowhere else.</p>
<p class="endnote">The function StackedVariables::index_owner appears nowhere else.</p>
<p class="endnote">The function StackedVariables::parse_from_owner_list is used in 10/teav (<a href="10-teav.html#SP16">&#167;16</a>).</p>
<p class="endnote">The function StackedVariables::parse_from_list appears nowhere else.</p>
<p class="endnote">The function StackedVariables::add_to_list appears nowhere else.</p>
<p class="endnote">The function StackedVariables::compile_frame_creator is used in 21/rl2 (<a href="21-rl2.html#SP14">&#167;14</a>), 21/ac (<a href="21-ac.html#SP8">&#167;8</a>).</p>
<p class="inwebparagraph"><a id="SP3_1"></a><b>&#167;3.1. </b><code class="display">
&lt;<span class="cwebmacrodefn">Compile frame creator if state is set</span> <span class="cwebmacronumber">3.1</span>&gt; =
</code></p>
<pre class="displaydefn">
<span class="reserved">for</span><span class="plain"> (</span><span class="reserved">stacked_variable_list</span><span class="plain"> *</span><span class="identifier">stvl</span><span class="plain"> = </span><span class="identifier">stvo</span><span class="plain">-</span><span class="element">&gt;list_of_stvs</span><span class="plain">; </span><span class="identifier">stvl</span><span class="plain">; </span><span class="identifier">stvl</span><span class="plain"> = </span><span class="identifier">stvl</span><span class="plain">-</span><span class="element">&gt;next</span><span class="plain">) {</span>
<span class="reserved">nonlocal_variable</span><span class="plain"> *</span><span class="identifier">q</span><span class="plain"> = </span><span class="functiontext">StackedVariables::get_variable</span><span class="plain">(</span><span class="identifier">stvl</span><span class="plain">-</span><span class="element">&gt;the_stv</span><span class="plain">);</span>
<span class="identifier">kind</span><span class="plain"> *</span><span class="identifier">K</span><span class="plain"> = </span><span class="functiontext">NonlocalVariables::kind</span><span class="plain">(</span><span class="identifier">q</span><span class="plain">);</span>
<span class="identifier">Produce::inv_primitive</span><span class="plain">(</span><span class="functiontext">Emit::tree</span><span class="plain">(), </span><span class="identifier">STORE_BIP</span><span class="plain">);</span>
<span class="identifier">Produce::down</span><span class="plain">(</span><span class="functiontext">Emit::tree</span><span class="plain">());</span>
<span class="identifier">Produce::inv_primitive</span><span class="plain">(</span><span class="functiontext">Emit::tree</span><span class="plain">(), </span><span class="identifier">LOOKUPREF_BIP</span><span class="plain">);</span>
<span class="identifier">Produce::down</span><span class="plain">(</span><span class="functiontext">Emit::tree</span><span class="plain">());</span>
<span class="identifier">Produce::val_iname</span><span class="plain">(</span><span class="functiontext">Emit::tree</span><span class="plain">(), </span><span class="identifier">K_value</span><span class="plain">, </span><span class="functiontext">Hierarchy::find</span><span class="plain">(</span><span class="constant">MSTACK_HL</span><span class="plain">));</span>
<span class="identifier">Produce::val_symbol</span><span class="plain">(</span><span class="functiontext">Emit::tree</span><span class="plain">(), </span><span class="identifier">K_value</span><span class="plain">, </span><span class="identifier">pos_s</span><span class="plain">);</span>
<span class="identifier">Produce::up</span><span class="plain">(</span><span class="functiontext">Emit::tree</span><span class="plain">());</span>
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<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">Kinds::Behaviour::uses_pointer_values</span><span class="plain">(</span><span class="identifier">K</span><span class="plain">))</span>
<span class="functiontext">Kinds::RunTime::emit_heap_allocation</span><span class="plain">(</span><span class="functiontext">Kinds::RunTime::make_heap_allocation</span><span class="plain">(</span><span class="identifier">K</span><span class="plain">, 1, -1));</span>
<span class="reserved">else</span>
<span class="functiontext">NonlocalVariables::emit_initial_value_as_val</span><span class="plain">(</span><span class="identifier">q</span><span class="plain">);</span>
<span class="identifier">Produce::up</span><span class="plain">(</span><span class="functiontext">Emit::tree</span><span class="plain">());</span>
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<span class="identifier">Produce::inv_primitive</span><span class="plain">(</span><span class="functiontext">Emit::tree</span><span class="plain">(), </span><span class="identifier">POSTINCREMENT_BIP</span><span class="plain">);</span>
<span class="identifier">Produce::down</span><span class="plain">(</span><span class="functiontext">Emit::tree</span><span class="plain">());</span>
<span class="identifier">Produce::ref_symbol</span><span class="plain">(</span><span class="functiontext">Emit::tree</span><span class="plain">(), </span><span class="identifier">K_value</span><span class="plain">, </span><span class="identifier">pos_s</span><span class="plain">);</span>
<span class="identifier">Produce::up</span><span class="plain">(</span><span class="functiontext">Emit::tree</span><span class="plain">());</span>
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<span class="plain">}</span>
</pre>
<p class="inwebparagraph"></p>
<p class="endnote">This code is used in <a href="#SP3">&#167;3</a>.</p>
<p class="inwebparagraph"><a id="SP3_2"></a><b>&#167;3.2. </b><code class="display">
&lt;<span class="cwebmacrodefn">Compile frame creator if state is clear</span> <span class="cwebmacronumber">3.2</span>&gt; =
</code></p>
<pre class="displaydefn">
<span class="reserved">for</span><span class="plain"> (</span><span class="reserved">stacked_variable_list</span><span class="plain"> *</span><span class="identifier">stvl</span><span class="plain"> = </span><span class="identifier">stvo</span><span class="plain">-</span><span class="element">&gt;list_of_stvs</span><span class="plain">; </span><span class="identifier">stvl</span><span class="plain">; </span><span class="identifier">stvl</span><span class="plain"> = </span><span class="identifier">stvl</span><span class="plain">-</span><span class="element">&gt;next</span><span class="plain">) {</span>
<span class="reserved">nonlocal_variable</span><span class="plain"> *</span><span class="identifier">q</span><span class="plain"> = </span><span class="functiontext">StackedVariables::get_variable</span><span class="plain">(</span><span class="identifier">stvl</span><span class="plain">-</span><span class="element">&gt;the_stv</span><span class="plain">);</span>
<span class="identifier">kind</span><span class="plain"> *</span><span class="identifier">K</span><span class="plain"> = </span><span class="functiontext">NonlocalVariables::kind</span><span class="plain">(</span><span class="identifier">q</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">Kinds::Behaviour::uses_pointer_values</span><span class="plain">(</span><span class="identifier">K</span><span class="plain">)) {</span>
<span class="identifier">Produce::inv_call_iname</span><span class="plain">(</span><span class="functiontext">Emit::tree</span><span class="plain">(), </span><span class="functiontext">Hierarchy::find</span><span class="plain">(</span><span class="constant">BLKVALUEFREE_HL</span><span class="plain">));</span>
<span class="identifier">Produce::down</span><span class="plain">(</span><span class="functiontext">Emit::tree</span><span class="plain">());</span>
<span class="identifier">Produce::inv_primitive</span><span class="plain">(</span><span class="functiontext">Emit::tree</span><span class="plain">(), </span><span class="identifier">LOOKUP_BIP</span><span class="plain">);</span>
<span class="identifier">Produce::down</span><span class="plain">(</span><span class="functiontext">Emit::tree</span><span class="plain">());</span>
<span class="identifier">Produce::val_iname</span><span class="plain">(</span><span class="functiontext">Emit::tree</span><span class="plain">(), </span><span class="identifier">K_value</span><span class="plain">, </span><span class="functiontext">Hierarchy::find</span><span class="plain">(</span><span class="constant">MSTACK_HL</span><span class="plain">));</span>
<span class="identifier">Produce::val_symbol</span><span class="plain">(</span><span class="functiontext">Emit::tree</span><span class="plain">(), </span><span class="identifier">K_value</span><span class="plain">, </span><span class="identifier">pos_s</span><span class="plain">);</span>
<span class="identifier">Produce::up</span><span class="plain">(</span><span class="functiontext">Emit::tree</span><span class="plain">());</span>
<span class="identifier">Produce::up</span><span class="plain">(</span><span class="functiontext">Emit::tree</span><span class="plain">());</span>
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<span class="plain">}</span>
<span class="identifier">Produce::inv_primitive</span><span class="plain">(</span><span class="functiontext">Emit::tree</span><span class="plain">(), </span><span class="identifier">POSTINCREMENT_BIP</span><span class="plain">);</span>
<span class="identifier">Produce::down</span><span class="plain">(</span><span class="functiontext">Emit::tree</span><span class="plain">());</span>
<span class="identifier">Produce::ref_symbol</span><span class="plain">(</span><span class="functiontext">Emit::tree</span><span class="plain">(), </span><span class="identifier">K_value</span><span class="plain">, </span><span class="identifier">pos_s</span><span class="plain">);</span>
<span class="identifier">Produce::up</span><span class="plain">(</span><span class="functiontext">Emit::tree</span><span class="plain">());</span>
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<span class="plain">}</span>
</pre>
<p class="inwebparagraph"></p>
<p class="endnote">This code is used in <a href="#SP3">&#167;3</a>.</p>
<p class="inwebparagraph"><a id="SP4"></a><b>&#167;4. </b></p>
<pre class="display">
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<span class="identifier">inter_name</span><span class="plain"> *</span><span class="functiontext">StackedVariables::frame_creator</span><span class="plain">(</span><span class="reserved">stacked_variable_owner</span><span class="plain"> *</span><span class="identifier">stvo</span><span class="plain">) {</span>
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<span class="reserved">return</span><span class="plain"> </span><span class="identifier">stvo</span><span class="plain">-</span><span class="element">&gt;stvo_iname</span><span class="plain">;</span>
<span class="plain">}</span>
</pre>
<p class="inwebparagraph"></p>
<p class="endnote">The function StackedVariables::frame_creator is used in 21/rl2 (<a href="21-rl2.html#SP14">&#167;14</a>), 21/ac (<a href="21-ac.html#SP8">&#167;8</a>).</p>
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