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<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"> <- </span>copy <span class="Constant">1</span>
]
<span class="traceContains">+run: jump 1:offset</span>
<span class="traceAbsent">-run: 1:number <- copy 1</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>
put<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">"jump"</span><span class="Delimiter">,</span> JUMP<span class="Delimiter">);</span>
<span class="Delimiter">:(before "End Primitive Recipe Checks")</span>
case JUMP: <span class="Delimiter">{</span>
if <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_error << 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> << <span class="Constant">"'jump' requires exactly one ingredient, but got "</span> << inst<span class="Delimiter">.</span>to_string<span class="Delimiter">()</span> << <span class="cSpecial">'\n'</span> << end<span class="Delimiter">();</span>
<span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
if <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_error << 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> << <span class="Constant">"first ingredient of 'jump' should be a label or offset, but got "</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>original_string << <span class="cSpecial">'\n'</span> << 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 "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>
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">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"jumping to instruction "</span> << current_step_index<span class="Delimiter">()</span> << 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 "End Mu Types Initialization")</span>
put<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">"offset"</span><span class="Delimiter">,</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>
put<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">"jump-if"</span><span class="Delimiter">,</span> JUMP_IF<span class="Delimiter">);</span>
<span class="Delimiter">:(before "End Primitive Recipe Checks")</span>
case JUMP_IF: <span class="Delimiter">{</span>
if <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_error << 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> << <span class="Constant">"'jump-if' requires exactly two ingredients, but got "</span> << inst<span class="Delimiter">.</span>to_string<span class="Delimiter">()</span> << <span class="cSpecial">'\n'</span> << end<span class="Delimiter">();</span>
<span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
if <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_error << 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> << <span class="Constant">"'jump-if' requires a boolean for its first ingredient, but got "</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>original_string << <span class="cSpecial">'\n'</span> << end<span class="Delimiter">();</span>
<span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
if <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_error << 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> << <span class="Constant">"'jump-if' requires a label or offset for its second ingredient, but got "</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>original_string << <span class="cSpecial">'\n'</span> << 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 "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>
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><span class="Constant">9998</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"jump-if fell through"</span> << 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">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"jumping to instruction "</span> << current_step_index<span class="Delimiter">()</span> << 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>
recipe main [
jump-if <span class="Constant">999</span><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>
]
<span class="traceContains">+run: jump-if 999, 1:offset</span>
<span class="traceContains">+run: jumping to instruction 2</span>
<span class="traceAbsent">-run: 1:number <- copy 1</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><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>
]
<span class="traceContains">+run: jump-if 0, 1:offset</span>
<span class="traceContains">+run: jump-if fell through</span>
<span class="traceContains">+run: 123:number <- copy 1</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>
put<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">"jump-unless"</span><span class="Delimiter">,</span> JUMP_UNLESS<span class="Delimiter">);</span>
<span class="Delimiter">:(before "End Primitive Recipe Checks")</span>
case JUMP_UNLESS: <span class="Delimiter">{</span>
if <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_error << 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> << <span class="Constant">"'jump-unless' requires exactly two ingredients, but got "</span> << inst<span class="Delimiter">.</span>to_string<span class="Delimiter">()</span> << <span class="cSpecial">'\n'</span> << end<span class="Delimiter">();</span>
<span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
if <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_error << 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> << <span class="Constant">"'jump-unless' requires a boolean for its first ingredient, but got "</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>original_string << <span class="cSpecial">'\n'</span> << end<span class="Delimiter">();</span>
<span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
if <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_error << 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> << <span class="Constant">"'jump-unless' requires a label or offset for its second ingredient, but got "</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>original_string << <span class="cSpecial">'\n'</span> << 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 "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>
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><span class="Constant">9998</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"jump-unless fell through"</span> << 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">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"jumping to instruction "</span> << current_step_index<span class="Delimiter">()</span> << 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>
recipe 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"> <- </span>copy <span class="Constant">1</span>
]
<span class="traceContains">+run: jump-unless 0, 1:offset</span>
<span class="traceContains">+run: jumping to instruction 2</span>
<span class="traceAbsent">-run: 123:number <- copy 1</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><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>
]
<span class="traceContains">+run: jump-unless 999, 1:offset</span>
<span class="traceContains">+run: jump-unless fell through</span>
<span class="traceContains">+run: 123:number <- copy 1</span>
<span class="traceContains">+mem: storing 1 in location 123</span>
</pre>
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