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<title>Mu - 039debug.cc</title>
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<a href='https://github.com/akkartik/mu/blob/master/039debug.cc'>https://github.com/akkartik/mu/blob/master/039debug.cc</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="SalientComment">//:: Some helpers for debugging.</span>
<span id="L2" class="LineNr"> 2 </span>
<span id="L3" class="LineNr"> 3 </span><span class="Comment">//: Load the 'map' file generated during 'bootstrap --debug translate' when running</span>
<span id="L4" class="LineNr"> 4 </span><span class="Comment">//: 'bootstrap --trace run'.</span>
<span id="L5" class="LineNr"> 5 </span><span class="Comment">//: (It'll only affect the trace.)</span>
<span id="L6" class="LineNr"> 6 </span>
<span id="L7" class="LineNr"> 7 </span><span class="Delimiter">:(before "End Globals")</span>
<span id="L8" class="LineNr"> 8 </span>map<<span class="Comment">/*</span><span class="Comment">address</span><span class="Comment">*/</span><span class="Normal">uint32_t</span><span class="Delimiter">,</span> string> <span class="Special"><a href='039debug.cc.html#L8'>Symbol_name</a></span><span class="Delimiter">;</span> <span class="Comment">// used only by 'bootstrap run'</span>
<span id="L9" class="LineNr"> 9 </span>map<<span class="Comment">/*</span><span class="Comment">address</span><span class="Comment">*/</span><span class="Normal">uint32_t</span><span class="Delimiter">,</span> string> <span class="Special"><a href='039debug.cc.html#L9'>Source_line</a></span><span class="Delimiter">;</span> <span class="Comment">// used only by 'bootstrap run'</span>
<span id="L10" class="LineNr"> 10 </span><span class="Delimiter">:(before "End --trace Settings")</span>
<span id="L11" class="LineNr"> 11 </span><a href='039debug.cc.html#L14'>load_labels</a><span class="Delimiter">();</span>
<span id="L12" class="LineNr"> 12 </span><a href='039debug.cc.html#L27'>load_source_lines</a><span class="Delimiter">();</span>
<span id="L13" class="LineNr"> 13 </span><span class="Delimiter">:(code)</span>
<span id="L14" class="LineNr"> 14 </span><span class="Normal">void</span> <a href='039debug.cc.html#L14'>load_labels</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
<span id="L15" class="LineNr"> 15 </span> ifstream fin<span class="Delimiter">(</span><span class="Constant">"labels"</span><span class="Delimiter">);</span>
<span id="L16" class="LineNr"> 16 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>fin<span class="Delimiter">.</span>fail<span class="Delimiter">())</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
<span id="L17" class="LineNr"> 17 </span> fin >> std::hex<span class="Delimiter">;</span>
<span id="L18" class="LineNr"> 18 </span> <span class="Normal">while</span> <span class="Delimiter">(</span><a href='001help.cc.html#L251'>has_data</a><span class="Delimiter">(</span>fin<span class="Delimiter">))</span> <span class="Delimiter">{</span>
<span id="L19" class="LineNr"> 19 </span> <span class="Normal">uint32_t</span> addr = <span class="Constant">0</span><span class="Delimiter">;</span>
<span id="L20" class="LineNr"> 20 </span> fin >> addr<span class="Delimiter">;</span>
<span id="L21" class="LineNr"> 21 </span> string <a href='011run.cc.html#L111'>name</a><span class="Delimiter">;</span>
<span id="L22" class="LineNr"> 22 </span> fin >> <a href='011run.cc.html#L111'>name</a><span class="Delimiter">;</span>
<span id="L23" class="LineNr"> 23 </span> <a href='001help.cc.html#L229'>put</a><span class="Delimiter">(</span><span class="Special"><a href='039debug.cc.html#L8'>Symbol_name</a></span><span class="Delimiter">,</span> addr<span class="Delimiter">,</span> <a href='011run.cc.html#L111'>name</a><span class="Delimiter">);</span>
<span id="L24" class="LineNr"> 24 </span> <span class="Delimiter">}</span>
<span id="L25" class="LineNr"> 25 </span><span class="Delimiter">}</span>
<span id="L26" class="LineNr"> 26 </span>
<span id="L27" class="LineNr"> 27 </span><span class="Normal">void</span> <a href='039debug.cc.html#L27'>load_source_lines</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
<span id="L28" class="LineNr"> 28 </span> ifstream fin<span class="Delimiter">(</span><span class="Constant">"source_lines"</span><span class="Delimiter">);</span>
<span id="L29" class="LineNr"> 29 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>fin<span class="Delimiter">.</span>fail<span class="Delimiter">())</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
<span id="L30" class="LineNr"> 30 </span> fin >> std::hex<span class="Delimiter">;</span>
<span id="L31" class="LineNr"> 31 </span> <span class="Normal">while</span> <span class="Delimiter">(</span><a href='001help.cc.html#L251'>has_data</a><span class="Delimiter">(</span>fin<span class="Delimiter">))</span> <span class="Delimiter">{</span>
<span id="L32" class="LineNr"> 32 </span> <span class="Normal">uint32_t</span> addr = <span class="Constant">0</span><span class="Delimiter">;</span>
<span id="L33" class="LineNr"> 33 </span> fin >> addr<span class="Delimiter">;</span>
<span id="L34" class="LineNr"> 34 </span> string <a href='011run.cc.html#L121'>line</a><span class="Delimiter">;</span>
<span id="L35" class="LineNr"> 35 </span> getline<span class="Delimiter">(</span>fin<span class="Delimiter">,</span> <a href='011run.cc.html#L121'>line</a><span class="Delimiter">);</span>
<span id="L36" class="LineNr"> 36 </span> <a href='001help.cc.html#L229'>put</a><span class="Delimiter">(</span><span class="Special"><a href='039debug.cc.html#L9'>Source_line</a></span><span class="Delimiter">,</span> addr<span class="Delimiter">,</span> <a href='039debug.cc.html#L113'>hacky_squeeze_out_whitespace</a><span class="Delimiter">(</span><a href='011run.cc.html#L121'>line</a><span class="Delimiter">));</span>
<span id="L37" class="LineNr"> 37 </span> <span class="Delimiter">}</span>
<span id="L38" class="LineNr"> 38 </span><span class="Delimiter">}</span>
<span id="L39" class="LineNr"> 39 </span>
<span id="L40" class="LineNr"> 40 </span><span class="Delimiter">:(after "Run One Instruction")</span>
<span id="L41" class="LineNr"> 41 </span><span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L233'>contains_key</a><span class="Delimiter">(</span><span class="Special"><a href='039debug.cc.html#L8'>Symbol_name</a></span><span class="Delimiter">,</span> <a href='010vm.cc.html#L26'>EIP</a><span class="Delimiter">))</span>
<span id="L42" class="LineNr"> 42 </span> <a href='003trace.cc.html#L96'>trace</a><span class="Delimiter">(</span><span class="Special">Callstack_depth</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"== label "</span> << get<span class="Delimiter">(</span><span class="Special"><a href='039debug.cc.html#L8'>Symbol_name</a></span><span class="Delimiter">,</span> <a href='010vm.cc.html#L26'>EIP</a><span class="Delimiter">)</span> << end<span class="Delimiter">();</span>
<span id="L43" class="LineNr"> 43 </span><span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L233'>contains_key</a><span class="Delimiter">(</span><span class="Special"><a href='039debug.cc.html#L9'>Source_line</a></span><span class="Delimiter">,</span> <a href='010vm.cc.html#L26'>EIP</a><span class="Delimiter">))</span>
<span id="L44" class="LineNr"> 44 </span> <a href='003trace.cc.html#L96'>trace</a><span class="Delimiter">(</span><span class="Special">Callstack_depth</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"inst: "</span> << get<span class="Delimiter">(</span><span class="Special"><a href='039debug.cc.html#L9'>Source_line</a></span><span class="Delimiter">,</span> <a href='010vm.cc.html#L26'>EIP</a><span class="Delimiter">)</span> << end<span class="Delimiter">();</span>
<span id="L45" class="LineNr"> 45 </span><span class="Normal">else</span>
<span id="L46" class="LineNr"> 46 </span> <span class="Comment">// no source line info; do what you can</span>
<span id="L47" class="LineNr"> 47 </span> <a href='003trace.cc.html#L96'>trace</a><span class="Delimiter">(</span><span class="Special">Callstack_depth</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"inst: "</span> << <a href='039debug.cc.html#L50'>debug_info</a><span class="Delimiter">(</span><a href='010vm.cc.html#L26'>EIP</a><span class="Delimiter">)</span> << end<span class="Delimiter">();</span>
<span id="L48" class="LineNr"> 48 </span>
<span id="L49" class="LineNr"> 49 </span><span class="Delimiter">:(code)</span>
<span id="L50" class="LineNr"> 50 </span>string <a href='039debug.cc.html#L50'>debug_info</a><span class="Delimiter">(</span><span class="Normal">uint32_t</span> inst_address<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L51" class="LineNr"> 51 </span> <span class="Normal">uint8_t</span> op = <a href='010vm.cc.html#L165'>read_mem_u8</a><span class="Delimiter">(</span>inst_address<span class="Delimiter">);</span>
<span id="L52" class="LineNr"> 52 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>op != <span class="Constant">0xe8</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L53" class="LineNr"> 53 </span> ostringstream out<span class="Delimiter">;</span>
<span id="L54" class="LineNr"> 54 </span> out << <a href='010vm.cc.html#L394'>HEXBYTE</a> << <a href='010vm.cc.html#L397'>NUM</a><span class="Delimiter">(</span>op<span class="Delimiter">);</span>
<span id="L55" class="LineNr"> 55 </span> <span class="Identifier">return</span> out<span class="Delimiter">.</span>str<span class="Delimiter">();</span>
<span id="L56" class="LineNr"> 56 </span> <span class="Delimiter">}</span>
<span id="L57" class="LineNr"> 57 </span> <span class="Normal">int32_t</span> offset = <a href='010vm.cc.html#L176'>read_mem_i32</a><span class="Delimiter">(</span>inst_address+<span class="Comment">/*</span><span class="Comment">skip op</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">);</span>
<span id="L58" class="LineNr"> 58 </span> <span class="Normal">uint32_t</span> next_eip = inst_address+<span class="Comment">/*</span><span class="Comment">inst length</span><span class="Comment">*/</span><span class="Constant">5</span>+offset<span class="Delimiter">;</span>
<span id="L59" class="LineNr"> 59 </span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L233'>contains_key</a><span class="Delimiter">(</span><span class="Special"><a href='039debug.cc.html#L8'>Symbol_name</a></span><span class="Delimiter">,</span> next_eip<span class="Delimiter">))</span>
<span id="L60" class="LineNr"> 60 </span> <span class="Identifier">return</span> <span class="Constant">"e8/call "</span>+get<span class="Delimiter">(</span><span class="Special"><a href='039debug.cc.html#L8'>Symbol_name</a></span><span class="Delimiter">,</span> next_eip<span class="Delimiter">);</span>
<span id="L61" class="LineNr"> 61 </span> ostringstream out<span class="Delimiter">;</span>
<span id="L62" class="LineNr"> 62 </span> out << <span class="Constant">"e8/call 0x"</span> << <a href='010vm.cc.html#L395'>HEXWORD</a> << next_eip<span class="Delimiter">;</span>
<span id="L63" class="LineNr"> 63 </span> <span class="Identifier">return</span> out<span class="Delimiter">.</span>str<span class="Delimiter">();</span>
<span id="L64" class="LineNr"> 64 </span><span class="Delimiter">}</span>
<span id="L65" class="LineNr"> 65 </span>
<span id="L66" class="LineNr"> 66 </span><span class="Comment">//: If a label starts with '$watch-', make a note of the effective address</span>
<span id="L67" class="LineNr"> 67 </span><span class="Comment">//: computed by the next instruction. Start dumping out its contents to the</span>
<span id="L68" class="LineNr"> 68 </span><span class="Comment">//: trace after every subsequent instruction.</span>
<span id="L69" class="LineNr"> 69 </span>
<span id="L70" class="LineNr"> 70 </span><span class="Delimiter">:(after "Run One Instruction")</span>
<span id="L71" class="LineNr"> 71 </span><a href='039debug.cc.html#L77'>dump_watch_points</a><span class="Delimiter">();</span>
<span id="L72" class="LineNr"> 72 </span><span class="Delimiter">:(before "End Globals")</span>
<span id="L73" class="LineNr"> 73 </span>map<string<span class="Delimiter">,</span> <span class="Normal">uint32_t</span>> <span class="Special"><a href='039debug.cc.html#L73'>Watch_points</a></span><span class="Delimiter">;</span>
<span id="L74" class="LineNr"> 74 </span><span class="Delimiter">:(before "End Reset")</span>
<span id="L75" class="LineNr"> 75 </span><span class="Special"><a href='039debug.cc.html#L73'>Watch_points</a></span><span class="Delimiter">.</span>clear<span class="Delimiter">();</span>
<span id="L76" class="LineNr"> 76 </span><span class="Delimiter">:(code)</span>
<span id="L77" class="LineNr"> 77 </span><span class="Normal">void</span> <a href='039debug.cc.html#L77'>dump_watch_points</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
<span id="L78" class="LineNr"> 78 </span> <span class="Normal">if</span> <span class="Delimiter">(</span><span class="Special"><a href='039debug.cc.html#L73'>Watch_points</a></span><span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
<span id="L79" class="LineNr"> 79 </span> <a href='003trace.cc.html#L96'>trace</a><span class="Delimiter">(</span><span class="Special">Callstack_depth</span><span class="Delimiter">,</span> <span class="Constant">"dbg"</span><span class="Delimiter">)</span> << <span class="Constant">"watch points:"</span> << end<span class="Delimiter">();</span>
<span id="L80" class="LineNr"> 80 </span> <span class="Normal">for</span> <span class="Delimiter">(</span>map<string<span class="Delimiter">,</span> <span class="Normal">uint32_t</span>>::iterator p = <span class="Special"><a href='039debug.cc.html#L73'>Watch_points</a></span><span class="Delimiter">.</span>begin<span class="Delimiter">();</span> p != <span class="Special"><a href='039debug.cc.html#L73'>Watch_points</a></span><span class="Delimiter">.</span>end<span class="Delimiter">();</span> ++p<span class="Delimiter">)</span>
<span id="L81" class="LineNr"> 81 </span> <a href='003trace.cc.html#L96'>trace</a><span class="Delimiter">(</span><span class="Special">Callstack_depth</span><span class="Delimiter">,</span> <span class="Constant">"dbg"</span><span class="Delimiter">)</span> << <span class="Constant">" "</span> << p<span class="Delimiter">-></span>first << <span class="Constant">": "</span> << <a href='010vm.cc.html#L395'>HEXWORD</a> << p<span class="Delimiter">-></span>second << <span class="Constant">" -> "</span> << <a href='010vm.cc.html#L395'>HEXWORD</a> << <a href='010vm.cc.html#L172'>read_mem_u32</a><span class="Delimiter">(</span>p<span class="Delimiter">-></span>second<span class="Delimiter">)</span> << end<span class="Delimiter">();</span>
<span id="L82" class="LineNr"> 82 </span><span class="Delimiter">}</span>
<span id="L83" class="LineNr"> 83 </span>
<span id="L84" class="LineNr"> 84 </span><span class="Delimiter">:(before "End Globals")</span>
<span id="L85" class="LineNr"> 85 </span>string <span class="Special">Watch_this_effective_address</span><span class="Delimiter">;</span>
<span id="L86" class="LineNr"> 86 </span><span class="Delimiter">:(after "Run One Instruction")</span>
<span id="L87" class="LineNr"> 87 </span><span class="Special">Watch_this_effective_address</span> = <span class="Constant">""</span><span class="Delimiter">;</span>
<span id="L88" class="LineNr"> 88 </span><span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L233'>contains_key</a><span class="Delimiter">(</span><span class="Special"><a href='039debug.cc.html#L8'>Symbol_name</a></span><span class="Delimiter">,</span> <a href='010vm.cc.html#L26'>EIP</a><span class="Delimiter">)</span> && <a href='001help.cc.html#L106'>starts_with</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span><span class="Special"><a href='039debug.cc.html#L8'>Symbol_name</a></span><span class="Delimiter">,</span> <a href='010vm.cc.html#L26'>EIP</a><span class="Delimiter">),</span> <span class="Constant">"$watch-"</span><span class="Delimiter">))</span>
<span id="L89" class="LineNr"> 89 </span> <span class="Special">Watch_this_effective_address</span> = get<span class="Delimiter">(</span><span class="Special"><a href='039debug.cc.html#L8'>Symbol_name</a></span><span class="Delimiter">,</span> <a href='010vm.cc.html#L26'>EIP</a><span class="Delimiter">);</span>
<span id="L90" class="LineNr"> 90 </span><span class="Delimiter">:(after "Found <a href='013direct_addressing.cc.html#L101'>effective_address</a>(addr)")</span>
<span id="L91" class="LineNr"> 91 </span><span class="Normal">if</span> <span class="Delimiter">(</span>!<span class="Special">Watch_this_effective_address</span><span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
<span id="L92" class="LineNr"> 92 </span> <a href='003trace.cc.html#L441'>dbg</a> << <span class="Constant">"now watching "</span> << <a href='010vm.cc.html#L395'>HEXWORD</a> << addr << <span class="Constant">" for "</span> << <span class="Special">Watch_this_effective_address</span> << end<span class="Delimiter">();</span>
<span id="L93" class="LineNr"> 93 </span> <a href='001help.cc.html#L229'>put</a><span class="Delimiter">(</span><span class="Special"><a href='039debug.cc.html#L73'>Watch_points</a></span><span class="Delimiter">,</span> <span class="Special">Watch_this_effective_address</span><span class="Delimiter">,</span> addr<span class="Delimiter">);</span>
<span id="L94" class="LineNr"> 94 </span><span class="Delimiter">}</span>
<span id="L95" class="LineNr"> 95 </span>
<span id="L96" class="LineNr"> 96 </span><span class="Comment">//: Special label that dumps regions of memory.</span>
<span id="L97" class="LineNr"> 97 </span><span class="Comment">//: Not a general mechanism; by the time you get here you're willing to hack</span>
<span id="L98" class="LineNr"> 98 </span><span class="Comment">//: on the emulator.</span>
<span id="L99" class="LineNr"> 99 </span><span class="Delimiter">:(after "Run One Instruction")</span>
<span id="L100" class="LineNr">100 </span><span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L233'>contains_key</a><span class="Delimiter">(</span><span class="Special"><a href='039debug.cc.html#L8'>Symbol_name</a></span><span class="Delimiter">,</span> <a href='010vm.cc.html#L26'>EIP</a><span class="Delimiter">)</span> && get<span class="Delimiter">(</span><span class="Special"><a href='039debug.cc.html#L8'>Symbol_name</a></span><span class="Delimiter">,</span> <a href='010vm.cc.html#L26'>EIP</a><span class="Delimiter">)</span> == <span class="Constant">"$dump-stream-at-EAX"</span><span class="Delimiter">)</span>
<span id="L101" class="LineNr">101 </span> <a href='039debug.cc.html#L103'>dump_stream_at</a><span class="Delimiter">(</span><span class="Special"><a href='010vm.cc.html#L25'>Reg</a></span>[EAX]<span class="Delimiter">.</span>u<span class="Delimiter">);</span>
<span id="L102" class="LineNr">102 </span><span class="Delimiter">:(code)</span>
<span id="L103" class="LineNr">103 </span><span class="Normal">void</span> <a href='039debug.cc.html#L103'>dump_stream_at</a><span class="Delimiter">(</span><span class="Normal">uint32_t</span> stream_start<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L104" class="LineNr">104 </span> <span class="Normal">int32_t</span> stream_length = <a href='010vm.cc.html#L176'>read_mem_i32</a><span class="Delimiter">(</span>stream_start + <span class="Constant">8</span><span class="Delimiter">);</span>
<span id="L105" class="LineNr">105 </span> <a href='003trace.cc.html#L441'>dbg</a> << <span class="Constant">"stream length: "</span> << std::dec << stream_length << end<span class="Delimiter">();</span>
<span id="L106" class="LineNr">106 </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 < stream_length + <span class="Constant">12</span><span class="Delimiter">;</span> ++i<span class="Delimiter">)</span>
<span id="L107" class="LineNr">107 </span> <a href='003trace.cc.html#L441'>dbg</a> << <span class="Constant">"0x"</span> << <a href='010vm.cc.html#L395'>HEXWORD</a> << <span class="Delimiter">(</span>stream_start+i<span class="Delimiter">)</span> << <span class="Constant">": "</span> << <a href='010vm.cc.html#L394'>HEXBYTE</a> << <a href='010vm.cc.html#L397'>NUM</a><span class="Delimiter">(</span><a href='010vm.cc.html#L165'>read_mem_u8</a><span class="Delimiter">(</span>stream_start+i<span class="Delimiter">))</span> << end<span class="Delimiter">();</span>
<span id="L108" class="LineNr">108 </span><span class="Delimiter">}</span>
<span id="L109" class="LineNr">109 </span>
<span id="L110" class="LineNr">110 </span><span class="Comment">//: helpers</span>
<span id="L111" class="LineNr">111 </span>
<span id="L112" class="LineNr">112 </span><span class="Delimiter">:(code)</span>
<span id="L113" class="LineNr">113 </span>string <a href='039debug.cc.html#L113'>hacky_squeeze_out_whitespace</a><span class="Delimiter">(</span><span class="Normal">const</span> string& s<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L114" class="LineNr">114 </span> <span class="Comment">// strip whitespace at start</span>
<span id="L115" class="LineNr">115 </span> string::const_iterator first = s<span class="Delimiter">.</span>begin<span class="Delimiter">();</span>
<span id="L116" class="LineNr">116 </span> <span class="Normal">while</span> <span class="Delimiter">(</span>first != s<span class="Delimiter">.</span>end<span class="Delimiter">()</span> && isspace<span class="Delimiter">(</span>*first<span class="Delimiter">))</span>
<span id="L117" class="LineNr">117 </span> ++first<span class="Delimiter">;</span>
<span id="L118" class="LineNr">118 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>first == s<span class="Delimiter">.</span>end<span class="Delimiter">())</span> <span class="Identifier">return</span> <span class="Constant">""</span><span class="Delimiter">;</span>
<span id="L119" class="LineNr">119 </span>
<span id="L120" class="LineNr">120 </span> <span class="Comment">// strip whitespace at end</span>
<span id="L121" class="LineNr">121 </span> string::const_iterator last = --s<span class="Delimiter">.</span>end<span class="Delimiter">();</span>
<span id="L122" class="LineNr">122 </span> <span class="Normal">while</span> <span class="Delimiter">(</span>last != s<span class="Delimiter">.</span>begin<span class="Delimiter">()</span> && isspace<span class="Delimiter">(</span>*last<span class="Delimiter">))</span>
<span id="L123" class="LineNr">123 </span> --last<span class="Delimiter">;</span>
<span id="L124" class="LineNr">124 </span> ++last<span class="Delimiter">;</span>
<span id="L125" class="LineNr">125 </span>
<span id="L126" class="LineNr">126 </span> <span class="Comment">// replace runs of spaces/dots with single space until comment or string</span>
<span id="L127" class="LineNr">127 </span> <span class="Comment">// </span><span class="Todo">TODO</span><span class="Comment">:</span>
<span id="L128" class="LineNr">128 </span> <span class="Comment">// leave alone dots not surrounded by whitespace</span>
<span id="L129" class="LineNr">129 </span> <span class="Comment">// leave alone '#' within word</span>
<span id="L130" class="LineNr">130 </span> <span class="Comment">// leave alone '"' within word</span>
<span id="L131" class="LineNr">131 </span> <span class="Comment">// squeeze spaces after end of string</span>
<span id="L132" class="LineNr">132 </span> ostringstream out<span class="Delimiter">;</span>
<span id="L133" class="LineNr">133 </span> <span class="Normal">bool</span> previous_was_space = <span class="Constant">false</span><span class="Delimiter">;</span>
<span id="L134" class="LineNr">134 </span> <span class="Normal">bool</span> in_comment_or_string = <span class="Constant">false</span><span class="Delimiter">;</span>
<span id="L135" class="LineNr">135 </span> <span class="Normal">for</span> <span class="Delimiter">(</span>string::const_iterator curr = first<span class="Delimiter">;</span> curr != last<span class="Delimiter">;</span> ++curr<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L136" class="LineNr">136 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>in_comment_or_string<span class="Delimiter">)</span>
<span id="L137" class="LineNr">137 </span> out << *curr<span class="Delimiter">;</span>
<span id="L138" class="LineNr">138 </span> <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>isspace<span class="Delimiter">(</span>*curr<span class="Delimiter">)</span> || *curr == <span class="Constant">'.'</span><span class="Delimiter">)</span>
<span id="L139" class="LineNr">139 </span> previous_was_space = <span class="Constant">true</span><span class="Delimiter">;</span>
<span id="L140" class="LineNr">140 </span> <span class="Normal">else</span> <span class="Delimiter">{</span>
<span id="L141" class="LineNr">141 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>previous_was_space<span class="Delimiter">)</span>
<span id="L142" class="LineNr">142 </span> out << <span class="Constant">' '</span><span class="Delimiter">;</span>
<span id="L143" class="LineNr">143 </span> out << *curr<span class="Delimiter">;</span>
<span id="L144" class="LineNr">144 </span> previous_was_space = <span class="Constant">false</span><span class="Delimiter">;</span>
<span id="L145" class="LineNr">145 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>*curr == <span class="Constant">'#'</span> || *curr == <span class="Constant">'"'</span><span class="Delimiter">)</span> in_comment_or_string = <span class="Constant">true</span><span class="Delimiter">;</span>
<span id="L146" class="LineNr">146 </span> <span class="Delimiter">}</span>
<span id="L147" class="LineNr">147 </span> <span class="Delimiter">}</span>
<span id="L148" class="LineNr">148 </span> <span class="Identifier">return</span> out<span class="Delimiter">.</span>str<span class="Delimiter">();</span>
<span id="L149" class="LineNr">149 </span><span class="Delimiter">}</span>
</pre>
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