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<span class="Comment">//: Jump primitives</span>
<span class="Delimiter">:(scenario jump_can_skip_instructions)</span>
<span class="CommentedCode">#? % Trace_stream->dump_layer = "all"; #? 1</span>
recipe main [
jump <span class="Constant">1</span>:offset
<span class="Constant">1</span>:number<span class="Special"> <- </span>copy <span class="Constant">1</span>:literal
]
<span class="traceContains">+run: jump 1:offset</span>
<span class="traceAbsent">-run: 1:number <- copy 1:literal</span>
<span class="traceAbsent">-mem: storing 1 in location 1</span>
<span class="Delimiter">:(before "End Primitive Recipe Declarations")</span>
JUMP<span class="Delimiter">,</span>
<span class="Delimiter">:(before "End Primitive Recipe Numbers")</span>
Recipe_number[<span class="Constant">"jump"</span>] = JUMP<span class="Delimiter">;</span>
<span class="Delimiter">:(before "End Primitive Recipe Implementations")</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>
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>Primitive_recipe_depth<span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"jumping to instruction "</span> << current_step_index<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 "End Mu Types Initialization")</span>
Type_number[<span class="Constant">"offset"</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 +-->+ |</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 "End Primitive Recipe Declarations")</span>
JUMP_IF<span class="Delimiter">,</span>
<span class="Delimiter">:(before "End Primitive Recipe Numbers")</span>
Recipe_number[<span class="Constant">"jump-if"</span>] = JUMP_IF<span class="Delimiter">;</span>
<span class="Delimiter">:(before "End Primitive Recipe Implementations")</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">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"jump-if fell through"</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>
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>Primitive_recipe_depth<span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"jumping to instruction "</span> << current_step_index<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>
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"> <- </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 <- 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"> <- </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 <- copy 1:literal</span>
<span class="traceContains">+mem: storing 1 in location 123</span>
<span class="Delimiter">:(before "End Primitive Recipe Declarations")</span>
JUMP_UNLESS<span class="Delimiter">,</span>
<span class="Delimiter">:(before "End Primitive Recipe Numbers")</span>
Recipe_number[<span class="Constant">"jump-unless"</span>] = JUMP_UNLESS<span class="Delimiter">;</span>
<span class="Delimiter">:(before "End Primitive Recipe Implementations")</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">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"jump-unless fell through"</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>
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>Primitive_recipe_depth<span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"jumping to instruction "</span> << current_step_index<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>
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"> <- </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 <- 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"> <- </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 <- copy 1:literal</span>
<span class="traceContains">+mem: storing 1 in location 123</span>
</pre>
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