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+<pre id='vimCodeElement'>
+<span id="L1" class="LineNr"> 1 </span><span class="Comment">//: Distinguish between labels marking the start of a function, and labels</span>
+<span id="L2" class="LineNr"> 2 </span><span class="Comment">//: inside functions.</span>
+<span id="L3" class="LineNr"> 3 </span><span class="Comment">//:</span>
+<span id="L4" class="LineNr"> 4 </span><span class="Comment">//: - Labels within functions start with a '$', and are only permitted in</span>
+<span id="L5" class="LineNr"> 5 </span><span class="Comment">//:   'jump' instructions.</span>
+<span id="L6" class="LineNr"> 6 </span><span class="Comment">//:</span>
+<span id="L7" class="LineNr"> 7 </span><span class="Comment">//: - Labels marking the start of functions lack the '$' sigil, and are only</span>
+<span id="L8" class="LineNr"> 8 </span><span class="Comment">//:   permitted in 'call' instructions.</span>
+<span id="L9" class="LineNr"> 9 </span>
+<span id="L10" class="LineNr">10 </span><span class="Delimiter">:(before &quot;Rewrite Labels(segment code)&quot;)</span>
+<span id="L11" class="LineNr">11 </span>check_label_types<span class="Delimiter">(</span>code<span class="Delimiter">);</span>
+<span id="L12" class="LineNr">12 </span><span class="Normal">if</span> <span class="Delimiter">(</span><a href='003trace.cc.html#L217'>trace_contains_errors</a><span class="Delimiter">())</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L13" class="LineNr">13 </span><span class="Delimiter">:(code)</span>
+<span id="L14" class="LineNr">14 </span><span class="Normal">void</span> check_label_types<span class="Delimiter">(</span><span class="Normal">const</span> segment&amp; code<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L15" class="LineNr">15 </span>  <a href='003trace.cc.html#L196'>trace</a><span class="Delimiter">(</span><span class="Constant">99</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;-- check <a href='003trace.cc.html#L73'>label</a> types&quot;</span> &lt;&lt; <a href='003trace.cc.html#L222'>end</a><span class="Delimiter">();</span>
+<span id="L16" class="LineNr">16 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L157'>SIZE</a><span class="Delimiter">(</span>code<span class="Delimiter">.</span><a href='011run.cc.html#L106'>lines</a><span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span>
+<span id="L17" class="LineNr">17 </span>    check_label_types<span class="Delimiter">(</span>code<span class="Delimiter">.</span><a href='011run.cc.html#L106'>lines</a><span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
+<span id="L18" class="LineNr">18 </span><span class="Delimiter">}</span>
+<span id="L19" class="LineNr">19 </span>
+<span id="L20" class="LineNr">20 </span><span class="Normal">void</span> check_label_types<span class="Delimiter">(</span><span class="Normal">const</span> line&amp; inst<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L21" class="LineNr">21 </span>  <span class="Normal">int</span> idx = <a href='031check_operands.cc.html#L276'>first_operand</a><span class="Delimiter">(</span>inst<span class="Delimiter">);</span>
+<span id="L22" class="LineNr">22 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>idx &gt;= <a href='001help.cc.html#L157'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span><a href='011run.cc.html#L111'>words</a><span class="Delimiter">))</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L23" class="LineNr">23 </span>  <span class="Normal">const</span> word&amp; target = inst<span class="Delimiter">.</span><a href='011run.cc.html#L111'>words</a><span class="Delimiter">.</span>at<span class="Delimiter">(</span>idx<span class="Delimiter">);</span>
+<span id="L24" class="LineNr">24 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='035labels.cc.html#L17'>is_number</a><span class="Delimiter">(</span>target<span class="Delimiter">.</span><a href='011run.cc.html#L118'>data</a><span class="Delimiter">))</span> <span class="Identifier">return</span><span class="Delimiter">;</span>  <span class="Comment">// handled elsewhere</span>
+<span id="L25" class="LineNr">25 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='036recommend_labels.cc.html#L37'>is_jump</a><span class="Delimiter">(</span>inst<span class="Delimiter">)</span> &amp;&amp; target<span class="Delimiter">.</span><a href='011run.cc.html#L118'>data</a><span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span> != <span class="Constant">'$'</span><span class="Delimiter">)</span>
+<span id="L26" class="LineNr">26 </span>    <a href='003trace.cc.html#L203'>raise</a> &lt;&lt; <span class="Constant">&quot;'&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original &lt;&lt; <span class="Constant">&quot;': jumps should always be to internal labels starting with '$'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L222'>end</a><span class="Delimiter">();</span>
+<span id="L27" class="LineNr">27 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='036recommend_labels.cc.html#L47'>is_call</a><span class="Delimiter">(</span>inst<span class="Delimiter">)</span> &amp;&amp; target<span class="Delimiter">.</span><a href='011run.cc.html#L118'>data</a><span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span> == <span class="Constant">'$'</span><span class="Delimiter">)</span>
+<span id="L28" class="LineNr">28 </span>    <a href='003trace.cc.html#L203'>raise</a> &lt;&lt; <span class="Constant">&quot;'&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original &lt;&lt; <span class="Constant">&quot;': calls should always be to function labels (not starting with '$')</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L222'>end</a><span class="Delimiter">();</span>
+<span id="L29" class="LineNr">29 </span><span class="Delimiter">}</span>
+<span id="L30" class="LineNr">30 </span>
+<span id="L31" class="LineNr">31 </span><span class="Delimiter">:(scenario catch_jump_to_function)</span>
+<span id="L32" class="LineNr">32 </span><span class="Special">% Hide_errors = true;</span>
+<span id="L33" class="LineNr">33 </span>== <span class="Constant">0x1</span>
+<span id="L34" class="LineNr">34 </span><span class="Normal"><a href='000organization.cc.html#L113'>main</a></span>:
+<span id="L35" class="LineNr">35 </span>7e/jump-<span class="Normal">if</span> foo/disp8
+<span id="L36" class="LineNr">36 </span><span class="Normal">foo</span>:
+<span id="L37" class="LineNr">37 </span><span class="traceContains">+error: '7e/jump-if foo/disp8': jumps should always be to internal labels starting with '$'</span>
+<span id="L38" class="LineNr">38 </span>
+<span id="L39" class="LineNr">39 </span><span class="Delimiter">:(scenario catch_call_to_internal_label)</span>
+<span id="L40" class="LineNr">40 </span><span class="Special">% Hide_errors = true;</span>
+<span id="L41" class="LineNr">41 </span>== <span class="Constant">0x1</span>
+<span id="L42" class="LineNr">42 </span><span class="Normal"><a href='000organization.cc.html#L113'>main</a></span>:
+<span id="L43" class="LineNr">43 </span>e8/call $foo/disp32
+<span id="L44" class="LineNr">44 </span> $foo:  <span class="Comment"># indent to avoid looking like a trace_count command for this scenario</span>
+<span id="L45" class="LineNr">45 </span><span class="traceContains">+error: 'e8/call $foo/disp32': calls should always be to function labels (not starting with '$')</span>
+</pre>
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