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

<span class="Delimiter">:(scenario jump_can_skip_instructions)</span>
recipe 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>:literal
]
<span class="traceContains">+run: jump 1:offset</span>
<span class="traceAbsent">-run: 1:number &lt;- copy 1:literal</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>
Recipe_number[<span class="Constant">&quot;jump&quot;</span>] = JUMP<span class="Delimiter">;</span>
<span class="Delimiter">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
case 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>
  assert<span class="Delimiter">(</span>SIZE<span class="Delimiter">(</span>ingredients<span class="Delimiter">)</span> == <span class="Constant">1</span><span class="Delimiter">);</span>
  assert<span class="Delimiter">(</span>scalar<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)));</span>
  instruction_counter += 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>
  trace<span class="Delimiter">(</span>Primitive_recipe_depth<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; instruction_counter+<span class="Constant">1</span><span class="Delimiter">;</span>
  <span class="Identifier">break</span><span class="Delimiter">;</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>
Type_number[<span class="Constant">&quot;offset&quot;</span>] = <span class="Constant">0</span><span class="Delimiter">;</span>

<span class="Delimiter">:(scenario jump_backward)</span>
recipe 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:offset</span>
<span class="traceContains">+run: jump -2:offset</span>
<span class="traceContains">+run: jump 3:offset</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>
Recipe_number[<span class="Constant">&quot;jump-if&quot;</span>] = JUMP_IF<span class="Delimiter">;</span>
<span class="Delimiter">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
case 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>
  assert<span class="Delimiter">(</span>SIZE<span class="Delimiter">(</span>ingredients<span class="Delimiter">)</span> == <span class="Constant">2</span><span class="Delimiter">);</span>
  assert<span class="Delimiter">(</span>scalar<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)));</span>
  if <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>Primitive_recipe_depth<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><span class="Delimiter">;</span>
    <span class="Identifier">break</span><span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
  assert<span class="Delimiter">(</span>scalar<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">)));</span>
  instruction_counter += 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>
  trace<span class="Delimiter">(</span>Primitive_recipe_depth<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; instruction_counter+<span class="Constant">1</span><span class="Delimiter">;</span>
  <span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>

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

<span class="Delimiter">:(scenario jump_if_fallthrough)</span>
recipe main [
  jump-if <span class="Constant">0</span>:literal<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>:literal
]
<span class="traceContains">+run: jump-if 0:literal, 1:offset</span>
<span class="traceContains">+run: jump-if fell through</span>
<span class="traceContains">+run: 123:number &lt;- copy 1:literal</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>
Recipe_number[<span class="Constant">&quot;jump-unless&quot;</span>] = JUMP_UNLESS<span class="Delimiter">;</span>
<span class="Delimiter">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
case 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>
  assert<span class="Delimiter">(</span>SIZE<span class="Delimiter">(</span>ingredients<span class="Delimiter">)</span> == <span class="Constant">2</span><span class="Delimiter">);</span>
  assert<span class="Delimiter">(</span>scalar<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)));</span>
  if <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>Primitive_recipe_depth<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><span class="Delimiter">;</span>
    <span class="Identifier">break</span><span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
  assert<span class="Delimiter">(</span>scalar<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">)));</span>
  instruction_counter += 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>
  trace<span class="Delimiter">(</span>Primitive_recipe_depth<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; instruction_counter+<span class="Constant">1</span><span class="Delimiter">;</span>
  <span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>

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

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