arc - mu - Soul of a tiny new machine. More thorough tests → More comprehensible and rewrite-friendly software → More resilient society.

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ass="p"></script> </head> <body> <pre id='vimCodeElement'> <span class="Comment">//: Support jumps to special labels called 'targets'. Targets must be in the</span> <span class="Comment">//: same recipe as the jump, and must be unique in that recipe. Targets always</span> <span class="Comment">//: start with a '+'.</span> <span class="Comment">//:</span> <span class="Comment">//: We'll also treat 'break' and 'loop' as jumps. The choice of name is</span> <span class="Comment">//: just documentation about intent; use 'break' to indicate you're exiting</span> <span class="Comment">//: one or more loop nests, and 'loop' to indicate you're skipping to the next</span> <span class="Comment">//: iteration of some containing loop nest.</span> <span class="Delimiter">:(scenario jump_to_label)</span> def main [ jump +target:label <span class="Constant">1</span>:number<span class="Special"> <- </span>copy <span class="Constant">0</span> +target ] <span class="traceAbsent">-mem: storing 0 in location 1</span> <span class="Delimiter">:(before "End Mu Types Initialization")</span> put<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">"label"</span><span class="Delimiter">,</span> <span class="Constant">0</span><span class="Delimiter">);</span> <span class="Delimiter">:(before "End Instruction Modifying Transforms")</span> Transform<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>transform_labels<span class="Delimiter">);</span> <span class="Comment">// idempotent</span> <span class="Delimiter">:(code)</span> <span class="Normal">void</span> transform_labels<span class="Delimiter">(</span><span class="Normal">const</span> recipe_ordinal r<span class="Delimiter">)</span> <span class="Delimiter">{</span> map<string<span class="Delimiter">,</span> <span class="Normal">int</span>> offset<span class="Delimiter">;</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 < SIZE<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>steps<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span> <span class="Normal">const</span> instruction& inst = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span> <span class="Normal">if</span> <span class="Delimiter">(</span>starts_with<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>label<span class="Delimiter">,</span> <span class="Constant">"+"</span><span class="Delimiter">))</span> <span class="Delimiter">{</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>offset<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>label<span class="Delimiter">))</span> <span class="Delimiter">{</span> put<span class="Delimiter">(</span>offset<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>label<span class="Delimiter">,</span> i<span class="Delimiter">);</span> <span class="Delimiter">}</span> <span class="Normal">else</span> <span class="Delimiter">{</span> raise << 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">"duplicate label '"</span> << inst<span class="Delimiter">.</span>label << <span class="Constant">"'"</span> << end<span class="Delimiter">();</span> <span class="Comment">// have all jumps skip some random but noticeable and deterministic amount of code</span> put<span class="Delimiter">(</span>offset<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>label<span class="Delimiter">,</span> <span class="Constant">9999</span><span class="Delimiter">);</span> <span class="Delimiter">}</span> <span class="Delimiter">}</span> <span class="Delimiter">}</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 < SIZE<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>steps<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span> instruction& inst = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span> <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>name == <span class="Constant">"jump"</span><span class="Delimiter">)</span> <span class="Delimiter">{</span> <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span> raise << 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' expects an ingredient but got none</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span> <span class="Identifier">return</span><span class="Delimiter">;</span> <span class="Delimiter">}</span> replace_offset<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> offset<span class="Delimiter">,</span> i<span class="Delimiter">,</span> r<span class="Delimiter">);</span> <span class="Delimiter">}</span> <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>name == <span class="Constant">"jump-if"</span> || inst<span class="Delimiter">.</span>name == <span class="Constant">"jump-unless"</span><span class="Delimiter">)</span> <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 << 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">"'"</span> << inst<span class="Delimiter">.</span>name << <span class="Constant">"' expects 2 ingredients but got "</span> << SIZE<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> << <span class="cSpecial">'\n'</span> << end<span class="Delimiter">();</span> <span class="Identifier">return</span><span class="Delimiter">;</span> <span class="Delimiter">}</span> replace_offset<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> offset<span class="Delimiter">,</span> i<span class="Delimiter">,</span> r<span class="Delimiter">);</span> <span class="Delimiter">}</span> <span class="Normal">if</span> <span class="Delimiter">((</span>inst<span class="Delimiter">.</span>name == <span class="Constant">"loop"</span> || inst<span class="Delimiter">.</span>name == <span class="Constant">"break"</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> replace_offset<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> offset<span class="Delimiter">,</span> i<span class="Delimiter">,</span> r<span class="Delimiter">);</span> <span class="Delimiter">}</span> <span class="Normal">if</span> <span class="Delimiter">((</span>inst<span class="Delimiter">.</span>name == <span class="Constant">"loop-if"</span> || inst<span class="Delimiter">.</span>name == <span class="Constant">"loop-unless"</span> || inst<span class="Delimiter">.</span>name == <span class="Constant">"break-if"</span> || inst<span class="Delimiter">.</span>name == <span class="Constant">"break-unless"</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> replace_offset<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> offset<span class="Delimiter">,</span> i<span class="Delimiter">,</span> r<span class="Delimiter">);</span> <span class="Delimiter">}</span> <span class="Delimiter">}</span> <span class="Delimiter">}</span> <span class="Delimiter">:(code)</span> <span class="Normal">void</span> replace_offset<span class="Delimiter">(</span>reagent& x<span class="Delimiter">,</span> <span class="Comment">/*</span><span class="Comment">const</span><span class="Comment">*/</span> map<string<span class="Delimiter">,</span> <span class="Normal">int</span>>& offset<span class="Delimiter">,</span> <span class="Normal">const</span> <span class="Normal">int</span> current_offset<span class="Delimiter">,</span> <span class="Normal">const</span> recipe_ordinal r<span class="Delimiter">)</span> <span class="Delimiter">{</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!is_literal<span class="Delimiter">(</span>x<span class="Delimiter">))</span> <span class="Delimiter">{</span> raise << 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 target must be offset or label but is '"</span> << x<span class="Delimiter">.</span>original_string << <span class="Constant">"'</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span> x<span class="Delimiter">.</span>set_value<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span> <span class="Comment">// no jump by default</span> <span class="Identifier">return</span><span class="Delimiter">;</span> <span class="Delimiter">}</span> <span class="Normal">if</span> <span class="Delimiter">(</span>x<span class="Delimiter">.</span>initialized<span class="Delimiter">)</span> <span class="Identifier">return</span><span class="Delimiter">;</span> <span class="Normal">if</span> <span class="Delimiter">(</span>is_integer<span class="Delimiter">(</span>x<span class="Delimiter">.</span>name<span class="Delimiter">))</span> <span class="Identifier">return</span><span class="Delimiter">;</span> <span class="Comment">// non-labels will be handled like other number operands</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!is_jump_target<span class="Delimiter">(</span>x<span class="Delimiter">.</span>name<span class="Delimiter">))</span> <span class="Delimiter">{</span> raise << 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">"can't jump to label '"</span> << x<span class="Delimiter">.</span>name << <span class="Constant">"'</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span> x<span class="Delimiter">.</span>set_value<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span> <span class="Comment">// no jump by default</span> <span class="Identifier">return</span><span class="Delimiter">;</span> <span class="Delimiter">}</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>offset<span class="Delimiter">,</span> x<span class="Delimiter">.</span>name<span class="Delimiter">))</span> <span class="Delimiter">{</span> raise << 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">"can't find label '"</span> << x<span class="Delimiter">.</span>name << <span class="Constant">"'</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span> x<span class="Delimiter">.</span>set_value<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span> <span class="Comment">// no jump by default</span> <span class="Identifier">return</span><span class="Delimiter">;</span> <span class="Delimiter">}</span> x<span class="Delimiter">.</span>set_value<span class="Delimiter">(</span>get<span class="Delimiter">(</span>offset<span class="Delimiter">,</span> x<span class="Delimiter">.</span>name<span class="Delimiter">)</span> - current_offset<span class="Delimiter">);</span> <span class="Delimiter">}</span> <span class="Normal">bool</span> is_jump_target<span class="Delimiter">(</span>string label<span class="Delimiter">)</span> <span class="Delimiter">{</span> <span class="Identifier">return</span> starts_with<span class="Delimiter">(</span>label<span class="Delimiter">,</span> <span class="Constant">"+"</span><span class="Delimiter">);</span> <span class="Delimiter">}</span> <span class="Delimiter">:(scenario break_to_label)</span> def main [ <span class="Delimiter">{</span> <span class="Delimiter">{</span> <span class="Identifier">break</span> +target:label <span class="Constant">1</span>:number<span class="Special"> <- </span>copy <span class="Constant">0</span> <span class="Delimiter">}</span> <span class="Delimiter">}</span> +target ] <span class="traceAbsent">-mem: storing 0 in location 1</span> <span class="Delimiter">:(scenario jump_if_to_label)</span> def main [ <span class="Delimiter">{</span> <span class="Delimiter">{</span> jump-<span class="Normal">if</span> <span class="Constant">1</span><span class="Delimiter">,</span> +target:label <span class="Constant">1</span>:number<span class="Special"> <- </span>copy <span class="Constant">0</span> <span class="Delimiter">}</span> <span class="Delimiter">}</span> +target ] <span class="traceAbsent">-mem: storing 0 in location 1</span> <span class="Delimiter">:(scenario loop_unless_to_label)</span> def main [ <span class="Delimiter">{</span> <span class="Delimiter">{</span> loop-unless <span class="Constant">0</span><span class="Delimiter">,</span> +target:label <span class="Comment"># loop/break with a label don't care about braces</span> <span class="Constant">1</span>:number<span class="Special"> <- </span>copy <span class="Constant">0</span> <span class="Delimiter">}</span> <span class="Delimiter">}</span> +target ] <span class="traceAbsent">-mem: storing 0 in location 1</span> <span class="Delimiter">:(scenario jump_runs_code_after_label)</span> def main [ <span class="Comment"># first a few lines of padding to exercise the offset computation</span> <span class="Constant">1</span>:number<span class="Special"> <- </span>copy <span class="Constant">0</span> <span class="Constant">2</span>:number<span class="Special"> <- </span>copy <span class="Constant">0</span> <span class="Constant">3</span>:number<span class="Special"> <- </span>copy <span class="Constant">0</span> jump +target:label <span class="Constant">4</span>:number<span class="Special"> <- </span>copy <span class="Constant">0</span> +target <span class="Constant">5</span>:number<span class="Special"> <- </span>copy <span class="Constant">0</span> ] <span class="traceContains">+mem: storing 0 in location 5</span> <span class="traceAbsent">-mem: storing 0 in location 4</span> <span class="Delimiter">:(scenario jump_fails_without_target)</span> <span class="Special">% Hide_errors = true;</span> def main [ jump ] <span class="traceContains">+error: main: 'jump' expects an ingredient but got none</span> <span class="Delimiter">:(scenario jump_fails_without_target_2)</span> <span class="Special">% Hide_errors = true;</span> def main [ jump-<span class="Normal">if</span> <span class="Constant">1</span>/<span class="Constant">true</span> ] <span class="traceContains">+error: main: 'jump-if' expects 2 ingredients but got 1</span> <span class="Delimiter">:(scenario recipe_fails_on_duplicate_jump_target)</span> <span class="Special">% Hide_errors = true;</span> def main [ +label <span class="Constant">1</span>:number<span class="Special"> <- </span>copy <span class="Constant">0</span> +label <span class="Constant">2</span>:number<span class="Special"> <- </span>copy <span class="Constant">0</span> ] <span class="traceContains">+error: main: duplicate label '+label'</span> <span class="Delimiter">:(scenario jump_ignores_nontarget_label)</span> <span class="Special">% Hide_errors = true;</span> def main [ <span class="Comment"># first a few lines of padding to exercise the offset computation</span> <span class="Constant">1</span>:number<span class="Special"> <- </span>copy <span class="Constant">0</span> <span class="Constant">2</span>:number<span class="Special"> <- </span>copy <span class="Constant">0</span> <span class="Constant">3</span>:number<span class="Special"> <- </span>copy <span class="Constant">0</span> jump $target:label <span class="Constant">4</span>:number<span class="Special"> <- </span>copy <span class="Constant">0</span> $target <span class="Constant">5</span>:number<span class="Special"> <- </span>copy <span class="Constant">0</span> ] <span class="traceContains">+error: main: can't jump to label '$target'</span> </pre> </body> </html>