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<pre id='vimCodeElement'>
<span class="Comment">//: Jump primitives</span>

<span class="Delimiter">:(scenario jump_can_skip_instructions)</span>
def main [
  jump <span class="Constant">1</span>:offset
  <span class="Constant">1</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">1</span>
]
<span class="traceContains">+run: jump {1: &quot;offset&quot;}</span>
<span class="traceAbsent">-run: {1: &quot;number&quot;} &lt;- copy {1: &quot;literal&quot;}</span>
<span class="traceAbsent">-mem: storing 1 in location 1</span>

<span class="Delimiter">:(before &quot;End Primitive Recipe Declarations&quot;)</span>
JUMP<span class="Delimiter">,</span>
<span class="Delimiter">:(before &quot;End Primitive Recipe Numbers&quot;)</span>
put<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;jump&quot;</span><span class="Delimiter">,</span> JUMP<span class="Delimiter">);</span>
<span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
<span class="Normal">case</span> JUMP: <span class="Delimiter">{</span>
  <span class="Normal">if</span> <span class="Delimiter">(</span>SIZE<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
    raise &lt;&lt; maybe<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'jump' requires exactly one ingredient, but got &quot;</span> &lt;&lt; to_original_string<span class="Delimiter">(</span>inst<span class="Delimiter">)</span> &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; end<span class="Delimiter">();</span>
    <span class="Identifier">break</span><span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_scalar<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
    raise &lt;&lt; maybe<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of 'jump' should be a label or offset, but got &quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; end<span class="Delimiter">();</span>
    <span class="Identifier">break</span><span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
  <span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Delimiter">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
<span class="Normal">case</span> JUMP: <span class="Delimiter">{</span>
  assert<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>initialized<span class="Delimiter">);</span>
  current_step_index<span class="Delimiter">()</span> += ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span>+<span class="Constant">1</span><span class="Delimiter">;</span>
  trace<span class="Delimiter">(</span><span class="Constant">9998</span><span class="Delimiter">,</span> <span class="Constant">&quot;run&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;jumping to instruction &quot;</span> &lt;&lt; current_step_index<span class="Delimiter">()</span> &lt;&lt; end<span class="Delimiter">();</span>
  <span class="Identifier">continue</span><span class="Delimiter">;</span>  <span class="Comment">// skip rest of this instruction</span>
<span class="Delimiter">}</span>

<span class="Comment">//: special type to designate jump targets</span>
<span class="Delimiter">:(before &quot;End Mu Types Initialization&quot;)</span>
put<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;offset&quot;</span><span class="Delimiter">,</span> <span class="Constant">0</span><span class="Delimiter">);</span>

<span class="Delimiter">:(scenario jump_backward)</span>
def main [
  jump <span class="Constant">1</span>:offset  <span class="Comment"># 0 -+</span>
  jump <span class="Constant">3</span>:offset  <span class="Comment">#    |   +-+ 1</span>
                 <span class="Comment">#   \/  /\ |</span>
  jump -<span class="Constant">2</span>:offset <span class="Comment">#  2 +--&gt;+ |</span>
]                <span class="Comment">#         \/ 3</span>
<span class="traceContains">+run: jump {1: &quot;offset&quot;}</span>
<span class="traceContains">+run: jump {-2: &quot;offset&quot;}</span>
<span class="traceContains">+run: jump {3: &quot;offset&quot;}</span>

<span class="Delimiter">:(before &quot;End Primitive Recipe Declarations&quot;)</span>
JUMP_IF<span class="Delimiter">,</span>
<span class="Delimiter">:(before &quot;End Primitive Recipe Numbers&quot;)</span>
put<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;jump-if&quot;</span><span class="Delimiter">,</span> JUMP_IF<span class="Delimiter">);</span>
<span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
<span class="Normal">case</span> JUMP_IF: <span class="Delimiter">{</span>
  <span class="Normal">if</span> <span class="Delimiter">(</span>SIZE<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">2</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
    raise &lt;&lt; maybe<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'jump-if' requires exactly two ingredients, but got &quot;</span> &lt;&lt; to_original_string<span class="Delimiter">(</span>inst<span class="Delimiter">)</span> &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; end<span class="Delimiter">();</span>
    <span class="Identifier">break</span><span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_scalar<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
    raise &lt;&lt; maybe<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'jump-if' requires a boolean for its first ingredient, but got &quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; end<span class="Delimiter">();</span>
    <span class="Identifier">break</span><span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_scalar<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
    raise &lt;&lt; maybe<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'jump-if' requires a label or offset for its second ingredient, but got &quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; end<span class="Delimiter">();</span>
    <span class="Identifier">break</span><span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
  <span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Delimiter">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
<span class="Normal">case</span> JUMP_IF: <span class="Delimiter">{</span>
  assert<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>initialized<span class="Delimiter">);</span>
  <span class="Normal">if</span> <span class="Delimiter">(</span>!ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> <span class="Delimiter">{</span>
    trace<span class="Delimiter">(</span><span class="Constant">9998</span><span class="Delimiter">,</span> <span class="Constant">&quot;run&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;jump-if fell through&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
    <span class="Identifier">break</span><span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
  current_step_index<span class="Delimiter">()</span> += ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span>+<span class="Constant">1</span><span class="Delimiter">;</span>
  trace<span class="Delimiter">(</span><span class="Constant">9998</span><span class="Delimiter">,</span> <span class="Constant">&quot;run&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;jumping to instruction &quot;</span> &lt;&lt; current_step_index<span class="Delimiter">()</span> &lt;&lt; end<span class="Delimiter">();</span>
  <span class="Identifier">continue</span><span class="Delimiter">;</span>  <span class="Comment">// skip rest of this instruction</span>
<span class="Delimiter">}</span>

<span class="Delimiter">:(scenario jump_if)</span>
def main [
  jump-<span class="Normal">if</span> <span class="Constant">999</span><span class="Delimiter">,</span> <span class="Constant">1</span>:offset
  <span class="Constant">123</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">1</span>
]
<span class="traceContains">+run: jump-if {999: &quot;literal&quot;}, {1: &quot;offset&quot;}</span>
<span class="traceContains">+run: jumping to instruction 2</span>
<span class="traceAbsent">-run: {1: &quot;number&quot;} &lt;- copy {1: &quot;literal&quot;}</span>
<span class="traceAbsent">-mem: storing 1 in location 123</span>

<span class="Delimiter">:(scenario jump_if_fallthrough)</span>
def main [
  jump-<span class="Normal">if</span> <span class="Constant">0</span><span class="Delimiter">,</span> <span class="Constant">1</span>:offset
  <span class="Constant">123</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">1</span>
]
<span class="traceContains">+run: jump-if {0: &quot;literal&quot;}, {1: &quot;offset&quot;}</span>
<span class="traceContains">+run: jump-if fell through</span>
<span class="traceContains">+run: {123: &quot;number&quot;} &lt;- copy {1: &quot;literal&quot;}</span>
<span class="traceContains">+mem: storing 1 in location 123</span>

<span class="Delimiter">:(before &quot;End Primitive Recipe Declarations&quot;)</span>
JUMP_UNLESS<span class="Delimiter">,</span>
<span class="Delimiter">:(before &quot;End Primitive Recipe Numbers&quot;)</span>
put<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;jump-unless&quot;</span><span class="Delimiter">,</span> JUMP_UNLESS<span class="Delimiter">);</span>
<span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
<span class="Normal">case</span> JUMP_UNLESS: <span class="Delimiter">{</span>
  <span class="Normal">if</span> <span class="Delimiter">(</span>SIZE<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">2</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
    raise &lt;&lt; maybe<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'jump-unless' requires exactly two ingredients, but got &quot;</span> &lt;&lt; to_original_string<span class="Delimiter">(</span>inst<span class="Delimiter">)</span> &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; end<span class="Delimiter">();</span>
    <span class="Identifier">break</span><span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_scalar<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
    raise &lt;&lt; maybe<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'jump-unless' requires a boolean for its first ingredient, but got &quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; end<span class="Delimiter">();</span>
    <span class="Identifier">break</span><span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_scalar<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
    raise &lt;&lt; maybe<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'jump-unless' requires a label or offset for its second ingredient, but got &quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; end<span class="Delimiter">();</span>
    <span class="Identifier">break</span><span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
  <span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Delimiter">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
<span class="Normal">case</span> JUMP_UNLESS: <span class="Delimiter">{</span>
  assert<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>initialized<span class="Delimiter">);</span>
  <span class="Normal">if</span> <span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> <span class="Delimiter">{</span>
    trace<span class="Delimiter">(</span><span class="Constant">9998</span><span class="Delimiter">,</span> <span class="Constant">&quot;run&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;jump-unless fell through&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
    <span class="Identifier">break</span><span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
  current_step_index<span class="Delimiter">()</span> += ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span>+<span class="Constant">1</span><span class="Delimiter">;</span>
  trace<span class="Delimiter">(</span><span class="Constant">9998</span><span class="Delimiter">,</span> <span class="Constant">&quot;run&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;jumping to instruction &quot;</span> &lt;&lt; current_step_index<span class="Delimiter">()</span> &lt;&lt; end<span class="Delimiter">();</span>
  <span class="Identifier">continue</span><span class="Delimiter">;</span>  <span class="Comment">// skip rest of this instruction</span>
<span class="Delimiter">}</span>

<span class="Delimiter">:(scenario jump_unless)</span>
def main [
  jump-unless <span class="Constant">0</span><span class="Delimiter">,</span> <span class="Constant">1</span>:offset
  <span class="Constant">123</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">1</span>
]
<span class="traceContains">+run: jump-unless {0: &quot;literal&quot;}, {1: &quot;offset&quot;}</span>
<span class="traceContains">+run: jumping to instruction 2</span>
<span class="traceAbsent">-run: {123: &quot;number&quot;} &lt;- copy {1: &quot;literal&quot;}</span>
<span class="traceAbsent">-mem: storing 1 in location 123</span>

<span class="Delimiter">:(scenario jump_unless_fallthrough)</span>
def main [
  jump-unless <span class="Constant">999</span><span class="Delimiter">,</span> <span class="Constant">1</span>:offset
  <span class="Constant">123</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">1</span>
]
<span class="traceContains">+run: jump-unless {999: &quot;literal&quot;}, {1: &quot;offset&quot;}</span>
<span class="traceContains">+run: jump-unless fell through</span>
<span class="traceContains">+run: {123: &quot;number&quot;} &lt;- copy {1: &quot;literal&quot;}</span>
<span class="traceContains">+mem: storing 1 in location 123</span>
</pre>
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