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<a href='https://github.com/akkartik/mu/blob/master/010---vm.cc'>https://github.com/akkartik/mu/blob/master/010---vm.cc</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="Comment">//: Core data structures for simulating the SubX VM (subset of an x86 processor)</span>
<span id="L2" class="LineNr"> 2 </span><span class="Comment">//:</span>
<span id="L3" class="LineNr"> 3 </span><span class="Comment">//: At the lowest level ("level 1") of abstraction, SubX executes x86</span>
<span id="L4" class="LineNr"> 4 </span><span class="Comment">//: instructions provided in the form of an array of bytes, loaded into memory</span>
<span id="L5" class="LineNr"> 5 </span><span class="Comment">//: starting at a specific address.</span>
<span id="L6" class="LineNr"> 6 </span><span class="Comment">//:</span>
<span id="L7" class="LineNr"> 7 </span><span class="Comment">//: SubX is fundamentally a translator. But having a VM to execute its</span>
<span id="L8" class="LineNr"> 8 </span><span class="Comment">//: translations affords greater confidence in it.</span>
<span id="L9" class="LineNr"> 9 </span>
<span id="L10" class="LineNr"> 10 </span><span class="SalientComment">//:: registers</span>
<span id="L11" class="LineNr"> 11 </span><span class="Comment">//: assume segment registers are hard-coded to 0</span>
<span id="L12" class="LineNr"> 12 </span><span class="Comment">//: no floating-point, MMX, etc. yet</span>
<span id="L13" class="LineNr"> 13 </span>
<span id="L14" class="LineNr"> 14 </span><span class="Delimiter">:(before "End Types")</span>
<span id="L15" class="LineNr"> 15 </span><span class="Normal">enum</span> <span class="Delimiter">{</span>
<span id="L16" class="LineNr"> 16 </span> <a href='010---vm.cc.html#L16'>EAX</a><span class="Delimiter">,</span>
<span id="L17" class="LineNr"> 17 </span> <a href='010---vm.cc.html#L17'>ECX</a><span class="Delimiter">,</span>
<span id="L18" class="LineNr"> 18 </span> <a href='010---vm.cc.html#L18'>EDX</a><span class="Delimiter">,</span>
<span id="L19" class="LineNr"> 19 </span> <a href='010---vm.cc.html#L19'>EBX</a><span class="Delimiter">,</span>
<span id="L20" class="LineNr"> 20 </span> <a href='010---vm.cc.html#L20'>ESP</a><span class="Delimiter">,</span>
<span id="L21" class="LineNr"> 21 </span> <a href='010---vm.cc.html#L21'>EBP</a><span class="Delimiter">,</span>
<span id="L22" class="LineNr"> 22 </span> <a href='010---vm.cc.html#L22'>ESI</a><span class="Delimiter">,</span>
<span id="L23" class="LineNr"> 23 </span> <a href='010---vm.cc.html#L23'>EDI</a><span class="Delimiter">,</span>
<span id="L24" class="LineNr"> 24 </span> <a href='010---vm.cc.html#L24'>NUM_INT_REGISTERS</a><span class="Delimiter">,</span>
<span id="L25" class="LineNr"> 25 </span><span class="Delimiter">};</span>
<span id="L26" class="LineNr"> 26 </span><span class="Normal">union</span> <a href='010---vm.cc.html#L26'>reg</a> <span class="Delimiter">{</span>
<span id="L27" class="LineNr"> 27 </span> <span class="Normal">int32_t</span> i<span class="Delimiter">;</span>
<span id="L28" class="LineNr"> 28 </span> <span class="Normal">uint32_t</span> u<span class="Delimiter">;</span>
<span id="L29" class="LineNr"> 29 </span><span class="Delimiter">};</span>
<span id="L30" class="LineNr"> 30 </span><span class="Delimiter">:(before "End Globals")</span>
<span id="L31" class="LineNr"> 31 </span><a href='010---vm.cc.html#L26'>reg</a> <span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span>[NUM_INT_REGISTERS] = <span class="Delimiter">{</span> <span class="Delimiter">{</span><span class="Constant">0</span><span class="Delimiter">}</span> <span class="Delimiter">};</span>
<span id="L32" class="LineNr"> 32 </span><span class="Normal">uint32_t</span> <a href='010---vm.cc.html#L32'>EIP</a> = <span class="Constant">1</span><span class="Delimiter">;</span> <span class="Comment">// preserve null pointer</span>
<span id="L33" class="LineNr"> 33 </span><span class="Delimiter">:(before "End Reset")</span>
<span id="L34" class="LineNr"> 34 </span>bzero<span class="Delimiter">(</span><span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span><span class="Delimiter">,</span> <span class="Normal">sizeof</span><span class="Delimiter">(</span><span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span><span class="Delimiter">));</span>
<span id="L35" class="LineNr"> 35 </span><a href='010---vm.cc.html#L32'>EIP</a> = <span class="Constant">1</span><span class="Delimiter">;</span> <span class="Comment">// preserve null pointer</span>
<span id="L36" class="LineNr"> 36 </span>
<span id="L37" class="LineNr"> 37 </span><span class="Delimiter">:(before "End <a href='001help.cc.html#L53'>Help</a> Contents")</span>
<span id="L38" class="LineNr"> 38 </span>cerr << <span class="Constant">" registers\n"</span><span class="Delimiter">;</span>
<span id="L39" class="LineNr"> 39 </span><span class="Delimiter">:(before "End <a href='001help.cc.html#L53'>Help</a> Texts")</span>
<span id="L40" class="LineNr"> 40 </span><a href='001help.cc.html#L260'>put_new</a><span class="Delimiter">(</span><span class="Special"><a href='001help.cc.html#L53'>Help</a></span><span class="Delimiter">,</span> <span class="Constant">"registers"</span><span class="Delimiter">,</span>
<span id="L41" class="LineNr"> 41 </span> <span class="Constant">"SubX currently supports eight 32-bit integer registers. From 0 to 7, they are:\n"</span>
<span id="L42" class="LineNr"> 42 </span> <span class="Constant">" <a href='010---vm.cc.html#L16'>EAX</a> <a href='010---vm.cc.html#L17'>ECX</a> <a href='010---vm.cc.html#L18'>EDX</a> <a href='010---vm.cc.html#L19'>EBX</a> <a href='010---vm.cc.html#L20'>ESP</a> <a href='010---vm.cc.html#L21'>EBP</a> <a href='010---vm.cc.html#L22'>ESI</a> EDI\n"</span>
<span id="L43" class="LineNr"> 43 </span> <span class="Constant">"ESP contains the top of the stack.\n"</span>
<span id="L44" class="LineNr"> 44 </span> <span class="Constant">"\n"</span>
<span id="L45" class="LineNr"> 45 </span> <span class="Constant">"-- 8-bit registers\n"</span>
<span id="L46" class="LineNr"> 46 </span> <span class="Constant">"Some instructions operate on eight *overlapping* 8-bit registers.\n"</span>
<span id="L47" class="LineNr"> 47 </span> <span class="Constant">"From 0 to 7, they are:\n"</span>
<span id="L48" class="LineNr"> 48 </span> <span class="Constant">" AL CL DL BL AH CH DH BH\n"</span>
<span id="L49" class="LineNr"> 49 </span> <span class="Constant">"The 8-bit registers overlap with the 32-bit ones. AL is the lowest signicant byte\n"</span>
<span id="L50" class="LineNr"> 50 </span> <span class="Constant">"of <a href='010---vm.cc.html#L16'>EAX</a>, AH is the second lowest significant byte, and so on.\n"</span>
<span id="L51" class="LineNr"> 51 </span> <span class="Constant">"\n"</span>
<span id="L52" class="LineNr"> 52 </span> <span class="Constant">"For example, if <a href='010---vm.cc.html#L19'>EBX</a> contains 0x11223344, then BL contains 0x44, and BH contains 0x33.\n"</span>
<span id="L53" class="LineNr"> 53 </span> <span class="Constant">"\n"</span>
<span id="L54" class="LineNr"> 54 </span> <span class="Constant">"There is no way to access bytes within <a href='010---vm.cc.html#L20'>ESP</a>, <a href='010---vm.cc.html#L21'>EBP</a>, <a href='010---vm.cc.html#L22'>ESI</a> or EDI.\n"</span>
<span id="L55" class="LineNr"> 55 </span> <span class="Constant">"\n"</span>
<span id="L56" class="LineNr"> 56 </span> <span class="Constant">"For complete details consult the IA-32 software developer's manual, volume 2,\n"</span>
<span id="L57" class="LineNr"> 57 </span> <span class="Constant">"table 2-2, \"</span><span class="Constant">32</span>-bit addressing forms with the ModR/<span class="Special">M</span> byte\<span class="Constant">".\n"</span>
<span id="L58" class="LineNr"> 58 </span> <span class="Constant">"It is included in this repository as 'modrm.pdf'.\n"</span>
<span id="L59" class="LineNr"> 59 </span> <span class="Constant">"The register encodings are described in the top row of the table, but you'll need\n"</span>
<span id="L60" class="LineNr"> 60 </span> <span class="Constant">"to spend some time with it.\n"</span>
<span id="L61" class="LineNr"> 61 </span> <span class="Constant">"\n"</span>
<span id="L62" class="LineNr"> 62 </span> <span class="Constant">"-- flag registers\n"</span>
<span id="L63" class="LineNr"> 63 </span> <span class="Constant">"Various instructions (particularly 'compare') modify one or more of four 1-bit\n"</span>
<span id="L64" class="LineNr"> 64 </span> <span class="Constant">"'flag' registers, as a side-effect:\n"</span>
<span id="L65" class="LineNr"> 65 </span> <span class="Constant">"- the sign flag (SF): usually set if an arithmetic result is negative, or\n"</span>
<span id="L66" class="LineNr"> 66 </span> <span class="Constant">" <a href='000organization.cc.html#L148'>reset</a> if not.\n"</span>
<span id="L67" class="LineNr"> 67 </span> <span class="Constant">"- the zero flag (ZF): usually set if a result is zero, or <a href='000organization.cc.html#L148'>reset</a> if not.\n"</span>
<span id="L68" class="LineNr"> 68 </span> <span class="Constant">"- the carry flag (CF): usually set if an arithmetic result overflows by just one bit.\n"</span>
<span id="L69" class="LineNr"> 69 </span> <span class="Constant">" Useful for operating on unsigned numbers.\n"</span>
<span id="L70" class="LineNr"> 70 </span> <span class="Constant">"- the overflow flag (OF): usually set if an arithmetic result overflows by more\n"</span>
<span id="L71" class="LineNr"> 71 </span> <span class="Constant">" than one bit. Useful for operating on signed numbers.\n"</span>
<span id="L72" class="LineNr"> 72 </span> <span class="Constant">"The flag bits are read by conditional jumps.\n"</span>
<span id="L73" class="LineNr"> 73 </span> <span class="Constant">"\n"</span>
<span id="L74" class="LineNr"> 74 </span> <span class="Constant">"For complete details on how different instructions update the flags, consult the IA-32\n"</span>
<span id="L75" class="LineNr"> 75 </span> <span class="Constant">"manual (volume 2). There's various versions of it online, such as <a href="https://c9x.me/x86,">https://c9x.me/x86,</a>\n"</span>
<span id="L76" class="LineNr"> 76 </span> <span class="Constant">"though of course you'll need to be careful to ignore instructions and flag registers\n"</span>
<span id="L77" class="LineNr"> 77 </span> <span class="Constant">"that SubX doesn't support.\n"</span>
<span id="L78" class="LineNr"> 78 </span> <span class="Constant">"\n"</span>
<span id="L79" class="LineNr"> 79 </span> <span class="Constant">"It isn't simple, but if this is the processor you have running on your computer.\n"</span>
<span id="L80" class="LineNr"> 80 </span> <span class="Constant">"Might as well get good at it.\n"</span>
<span id="L81" class="LineNr"> 81 </span><span class="Delimiter">);</span>
<span id="L82" class="LineNr"> 82 </span>
<span id="L83" class="LineNr"> 83 </span><span class="Delimiter">:(before "End Globals")</span>
<span id="L84" class="LineNr"> 84 </span><span class="Comment">// the subset of x86 flag registers we care about</span>
<span id="L85" class="LineNr"> 85 </span><span class="Normal">bool</span> SF = <span class="Constant">false</span><span class="Delimiter">;</span> <span class="Comment">// sign flag</span>
<span id="L86" class="LineNr"> 86 </span><span class="Normal">bool</span> <a href='010---vm.cc.html#L86'>ZF</a> = <span class="Constant">false</span><span class="Delimiter">;</span> <span class="Comment">// zero flag</span>
<span id="L87" class="LineNr"> 87 </span><span class="Normal">bool</span> <a href='010---vm.cc.html#L87'>CF</a> = <span class="Constant">false</span><span class="Delimiter">;</span> <span class="Comment">// carry flag</span>
<span id="L88" class="LineNr"> 88 </span><span class="Normal">bool</span> <a href='010---vm.cc.html#L88'>OF</a> = <span class="Constant">false</span><span class="Delimiter">;</span> <span class="Comment">// overflow flag</span>
<span id="L89" class="LineNr"> 89 </span><span class="Delimiter">:(before "End Reset")</span>
<span id="L90" class="LineNr"> 90 </span>SF = <a href='010---vm.cc.html#L86'>ZF</a> = <a href='010---vm.cc.html#L87'>CF</a> = <a href='010---vm.cc.html#L88'>OF</a> = <span class="Constant">false</span><span class="Delimiter">;</span>
<span id="L91" class="LineNr"> 91 </span>
<span id="L92" class="LineNr"> 92 </span><span class="SalientComment">//:: simulated RAM</span>
<span id="L93" class="LineNr"> 93 </span>
<span id="L94" class="LineNr"> 94 </span><span class="Delimiter">:(before "End Types")</span>
<span id="L95" class="LineNr"> 95 </span><span class="Normal">const</span> <span class="Normal">uint32_t</span> <a href='010---vm.cc.html#L95'>SEGMENT_ALIGNMENT</a> = <span class="Constant">0x1000000</span><span class="Delimiter">;</span> <span class="Comment">// 16MB</span>
<span id="L96" class="LineNr"> 96 </span><span class="Normal">inline</span> <span class="Normal">uint32_t</span> <a href='010---vm.cc.html#L96'>align_upwards</a><span class="Delimiter">(</span><span class="Normal">uint32_t</span> x<span class="Delimiter">,</span> <span class="Normal">uint32_t</span> align<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L97" class="LineNr"> 97 </span> <span class="Identifier">return</span> <span class="Delimiter">(</span>x+align-<span class="Constant">1</span><span class="Delimiter">)</span> & -<span class="Delimiter">(</span>align<span class="Delimiter">);</span>
<span id="L98" class="LineNr"> 98 </span><span class="Delimiter">}</span>
<span id="L99" class="LineNr"> 99 </span>
<span id="L100" class="LineNr">100 </span><span class="Comment">// Like in real-world Linux, we'll allocate RAM for our programs in disjoint</span>
<span id="L101" class="LineNr">101 </span><span class="Comment">// slabs called VMAs or Virtual Memory Areas.</span>
<span id="L102" class="LineNr">102 </span><span class="Normal">struct</span> vma <span class="Delimiter">{</span>
<span id="L103" class="LineNr">103 </span> <span class="Normal">uint32_t</span> start<span class="Delimiter">;</span> <span class="Comment">// inclusive</span>
<span id="L104" class="LineNr">104 </span> <span class="Normal">uint32_t</span> end<span class="Delimiter">;</span> <span class="Comment">// exclusive</span>
<span id="L105" class="LineNr">105 </span> vector<<span class="Normal">uint8_t</span>> <a href='010---vm.cc.html#L105'>_data</a><span class="Delimiter">;</span>
<span id="L106" class="LineNr">106 </span> vma<span class="Delimiter">(</span><span class="Normal">uint32_t</span> s<span class="Delimiter">,</span> <span class="Normal">uint32_t</span> e<span class="Delimiter">)</span> :start<span class="Delimiter">(</span>s<span class="Delimiter">),</span> end<span class="Delimiter">(</span>e<span class="Delimiter">)</span> <span class="Delimiter">{}</span>
<span id="L107" class="LineNr">107 </span> vma<span class="Delimiter">(</span><span class="Normal">uint32_t</span> s<span class="Delimiter">)</span> :start<span class="Delimiter">(</span>s<span class="Delimiter">),</span> end<span class="Delimiter">(</span><a href='010---vm.cc.html#L96'>align_upwards</a><span class="Delimiter">(</span>s+<span class="Constant">1</span><span class="Delimiter">,</span> <a href='010---vm.cc.html#L95'>SEGMENT_ALIGNMENT</a><span class="Delimiter">))</span> <span class="Delimiter">{}</span>
<span id="L108" class="LineNr">108 </span> <span class="Normal">bool</span> <a href='010---vm.cc.html#L108'>match</a><span class="Delimiter">(</span><span class="Normal">uint32_t</span> a<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L109" class="LineNr">109 </span> <span class="Identifier">return</span> a >= start && a < end<span class="Delimiter">;</span>
<span id="L110" class="LineNr">110 </span> <span class="Delimiter">}</span>
<span id="L111" class="LineNr">111 </span> <span class="Normal">bool</span> <a href='010---vm.cc.html#L111'>match32</a><span class="Delimiter">(</span><span class="Normal">uint32_t</span> a<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L112" class="LineNr">112 </span> <span class="Identifier">return</span> a >= start && a+<span class="Constant">4</span> <= end<span class="Delimiter">;</span>
<span id="L113" class="LineNr">113 </span> <span class="Delimiter">}</span>
<span id="L114" class="LineNr">114 </span> <span class="Normal">uint8_t</span>& data<span class="Delimiter">(</span><span class="Normal">uint32_t</span> a<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L115" class="LineNr">115 </span> assert<span class="Delimiter">(</span><a href='010---vm.cc.html#L108'>match</a><span class="Delimiter">(</span>a<span class="Delimiter">));</span>
<span id="L116" class="LineNr">116 </span> <span class="Normal">uint32_t</span> result_index = a-start<span class="Delimiter">;</span>
<span id="L117" class="LineNr">117 </span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='010---vm.cc.html#L105'>_data</a><span class="Delimiter">.</span>size<span class="Delimiter">()</span> <= result_index<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L118" class="LineNr">118 </span> <span class="Normal">const</span> <span class="Normal">int</span> align = <span class="Constant">0x1000</span><span class="Delimiter">;</span>
<span id="L119" class="LineNr">119 </span> <span class="Normal">uint32_t</span> result_size = result_index + <span class="Constant">1</span><span class="Delimiter">;</span> <span class="Comment">// size needed for result_index to be valid</span>
<span id="L120" class="LineNr">120 </span> <span class="Normal">uint32_t</span> new_size = <a href='010---vm.cc.html#L96'>align_upwards</a><span class="Delimiter">(</span>result_size<span class="Delimiter">,</span> align<span class="Delimiter">);</span>
<span id="L121" class="LineNr">121 </span> <span class="Comment">// grow at least 2x to maintain some amortized complexity guarantees</span>
<span id="L122" class="LineNr">122 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>new_size < <a href='010---vm.cc.html#L105'>_data</a><span class="Delimiter">.</span>size<span class="Delimiter">()</span> * <span class="Constant">2</span><span class="Delimiter">)</span>
<span id="L123" class="LineNr">123 </span> new_size = <a href='010---vm.cc.html#L105'>_data</a><span class="Delimiter">.</span>size<span class="Delimiter">()</span> * <span class="Constant">2</span><span class="Delimiter">;</span>
<span id="L124" class="LineNr">124 </span> <span class="Comment">// never grow past the stated limit</span>
<span id="L125" class="LineNr">125 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>new_size > end-start<span class="Delimiter">)</span>
<span id="L126" class="LineNr">126 </span> new_size = end-start<span class="Delimiter">;</span>
<span id="L127" class="LineNr">127 </span> <a href='010---vm.cc.html#L105'>_data</a><span class="Delimiter">.</span>resize<span class="Delimiter">(</span>new_size<span class="Delimiter">);</span>
<span id="L128" class="LineNr">128 </span> <span class="Delimiter">}</span>
<span id="L129" class="LineNr">129 </span> <span class="Identifier">return</span> <a href='010---vm.cc.html#L105'>_data</a><span class="Delimiter">.</span>at<span class="Delimiter">(</span>result_index<span class="Delimiter">);</span>
<span id="L130" class="LineNr">130 </span> <span class="Delimiter">}</span>
<span id="L131" class="LineNr">131 </span> <span class="Normal">void</span> <a href='010---vm.cc.html#L131'>grow_until</a><span class="Delimiter">(</span><span class="Normal">uint32_t</span> new_end_address<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L132" class="LineNr">132 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>new_end_address < end<span class="Delimiter">)</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
<span id="L133" class="LineNr">133 </span> <span class="Comment">// Ugly: vma knows about the global Memory list of vmas</span>
<span id="L134" class="LineNr">134 </span> <span class="Normal">void</span> <a href='010---vm.cc.html#L141'>sanity_check</a><span class="Delimiter">(</span><span class="Normal">uint32_t</span> start<span class="Delimiter">,</span> <span class="Normal">uint32_t</span> end<span class="Delimiter">);</span>
<span id="L135" class="LineNr">135 </span> <a href='010---vm.cc.html#L141'>sanity_check</a><span class="Delimiter">(</span>start<span class="Delimiter">,</span> new_end_address<span class="Delimiter">);</span>
<span id="L136" class="LineNr">136 </span> end = new_end_address<span class="Delimiter">;</span>
<span id="L137" class="LineNr">137 </span> <span class="Delimiter">}</span>
<span id="L138" class="LineNr">138 </span> <span class="Comment">// End vma Methods</span>
<span id="L139" class="LineNr">139 </span><span class="Delimiter">};</span>
<span id="L140" class="LineNr">140 </span><span class="Delimiter">:(code)</span>
<span id="L141" class="LineNr">141 </span><span class="Normal">void</span> <a href='010---vm.cc.html#L141'>sanity_check</a><span class="Delimiter">(</span><span class="Normal">uint32_t</span> start<span class="Delimiter">,</span> <span class="Normal">uint32_t</span> end<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L142" class="LineNr">142 </span> <span class="Normal">bool</span> dup_found = <span class="Constant">false</span><span class="Delimiter">;</span>
<span id="L143" class="LineNr">143 </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 < <a href='001help.cc.html#L164'>SIZE</a><span class="Delimiter">(</span><span class="Special"><a href='010---vm.cc.html#L160'>Mem</a></span><span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L144" class="LineNr">144 </span> <span class="Normal">const</span> vma& curr = <span class="Special"><a href='010---vm.cc.html#L160'>Mem</a></span><span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
<span id="L145" class="LineNr">145 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>curr<span class="Delimiter">.</span>start == start<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L146" class="LineNr">146 </span> assert<span class="Delimiter">(</span>!dup_found<span class="Delimiter">);</span>
<span id="L147" class="LineNr">147 </span> dup_found = <span class="Constant">true</span><span class="Delimiter">;</span>
<span id="L148" class="LineNr">148 </span> <span class="Delimiter">}</span>
<span id="L149" class="LineNr">149 </span> <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>curr<span class="Delimiter">.</span>start > start<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L150" class="LineNr">150 </span> assert<span class="Delimiter">(</span>curr<span class="Delimiter">.</span>start > end<span class="Delimiter">);</span>
<span id="L151" class="LineNr">151 </span> <span class="Delimiter">}</span>
<span id="L152" class="LineNr">152 </span> <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>curr<span class="Delimiter">.</span>start < start<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L153" class="LineNr">153 </span> assert<span class="Delimiter">(</span>curr<span class="Delimiter">.</span>end < start<span class="Delimiter">);</span>
<span id="L154" class="LineNr">154 </span> <span class="Delimiter">}</span>
<span id="L155" class="LineNr">155 </span> <span class="Delimiter">}</span>
<span id="L156" class="LineNr">156 </span><span class="Delimiter">}</span>
<span id="L157" class="LineNr">157 </span>
<span id="L158" class="LineNr">158 </span><span class="Delimiter">:(before "End Globals")</span>
<span id="L159" class="LineNr">159 </span><span class="Comment">// RAM is made of VMAs.</span>
<span id="L160" class="LineNr">160 </span>vector<vma> <span class="Special"><a href='010---vm.cc.html#L160'>Mem</a></span><span class="Delimiter">;</span>
<span id="L161" class="LineNr">161 </span><span class="Delimiter">:(code)</span>
<span id="L162" class="LineNr">162 </span><span class="Delimiter">:(before "End Globals")</span>
<span id="L163" class="LineNr">163 </span><span class="Normal">uint32_t</span> <span class="Special"><a href='010---vm.cc.html#L163'>End_of_program</a></span> = <span class="Constant">0</span><span class="Delimiter">;</span> <span class="Comment">// when the program executes past this address in tests we'll stop the test</span>
<span id="L164" class="LineNr">164 </span><span class="Comment">// The stack grows downward. Can't increase its size for now.</span>
<span id="L165" class="LineNr">165 </span><span class="Delimiter">:(before "End Reset")</span>
<span id="L166" class="LineNr">166 </span><span class="Special"><a href='010---vm.cc.html#L160'>Mem</a></span><span class="Delimiter">.</span>clear<span class="Delimiter">();</span>
<span id="L167" class="LineNr">167 </span><span class="Special"><a href='010---vm.cc.html#L163'>End_of_program</a></span> = <span class="Constant">0</span><span class="Delimiter">;</span>
<span id="L168" class="LineNr">168 </span><span class="Delimiter">:(code)</span>
<span id="L169" class="LineNr">169 </span><span class="Comment">// These helpers depend on Mem being laid out contiguously (so you can't use a</span>
<span id="L170" class="LineNr">170 </span><span class="Comment">// map, etc.) and on the host also being little-endian.</span>
<span id="L171" class="LineNr">171 </span><span class="Normal">inline</span> <span class="Normal">uint8_t</span> <a href='010---vm.cc.html#L171'>read_mem_u8</a><span class="Delimiter">(</span><span class="Normal">uint32_t</span> addr<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L172" class="LineNr">172 </span> <span class="Normal">uint8_t</span>* handle = <a href='010---vm.cc.html#L186'>mem_addr_u8</a><span class="Delimiter">(</span>addr<span class="Delimiter">);</span> <span class="Comment">// error messages get printed here</span>
<span id="L173" class="LineNr">173 </span> <span class="Identifier">return</span> handle ? *handle : <span class="Constant">0</span><span class="Delimiter">;</span>
<span id="L174" class="LineNr">174 </span><span class="Delimiter">}</span>
<span id="L175" class="LineNr">175 </span><span class="Normal">inline</span> <span class="Normal">int8_t</span> <a href='010---vm.cc.html#L175'>read_mem_i8</a><span class="Delimiter">(</span><span class="Normal">uint32_t</span> addr<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L176" class="LineNr">176 </span> <span class="Identifier">return</span> <span class="Normal">static_cast</span><<span class="Normal">int8_t</span>><span class="Delimiter">(</span><a href='010---vm.cc.html#L171'>read_mem_u8</a><span class="Delimiter">(</span>addr<span class="Delimiter">));</span>
<span id="L177" class="LineNr">177 </span><span class="Delimiter">}</span>
<span id="L178" class="LineNr">178 </span><span class="Normal">inline</span> <span class="Normal">uint32_t</span> <a href='010---vm.cc.html#L178'>read_mem_u32</a><span class="Delimiter">(</span><span class="Normal">uint32_t</span> addr<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L179" class="LineNr">179 </span> <span class="Normal">uint32_t</span>* handle = <a href='010---vm.cc.html#L205'>mem_addr_u32</a><span class="Delimiter">(</span>addr<span class="Delimiter">);</span> <span class="Comment">// error messages get printed here</span>
<span id="L180" class="LineNr">180 </span> <span class="Identifier">return</span> handle ? *handle : <span class="Constant">0</span><span class="Delimiter">;</span>
<span id="L181" class="LineNr">181 </span><span class="Delimiter">}</span>
<span id="L182" class="LineNr">182 </span><span class="Normal">inline</span> <span class="Normal">int32_t</span> <a href='010---vm.cc.html#L182'>read_mem_i32</a><span class="Delimiter">(</span><span class="Normal">uint32_t</span> addr<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L183" class="LineNr">183 </span> <span class="Identifier">return</span> <span class="Normal">static_cast</span><<span class="Normal">int32_t</span>><span class="Delimiter">(</span><a href='010---vm.cc.html#L178'>read_mem_u32</a><span class="Delimiter">(</span>addr<span class="Delimiter">));</span>
<span id="L184" class="LineNr">184 </span><span class="Delimiter">}</span>
<span id="L185" class="LineNr">185 </span>
<span id="L186" class="LineNr">186 </span><span class="Normal">inline</span> <span class="Normal">uint8_t</span>* <a href='010---vm.cc.html#L186'>mem_addr_u8</a><span class="Delimiter">(</span><span class="Normal">uint32_t</span> addr<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L187" class="LineNr">187 </span> <span class="Normal">uint8_t</span>* result = <span class="Constant">NULL</span><span class="Delimiter">;</span>
<span id="L188" class="LineNr">188 </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 < <a href='001help.cc.html#L164'>SIZE</a><span class="Delimiter">(</span><span class="Special"><a href='010---vm.cc.html#L160'>Mem</a></span><span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L189" class="LineNr">189 </span> <span class="Normal">if</span> <span class="Delimiter">(</span><span class="Special"><a href='010---vm.cc.html#L160'>Mem</a></span><span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span><a href='010---vm.cc.html#L108'>match</a><span class="Delimiter">(</span>addr<span class="Delimiter">))</span> <span class="Delimiter">{</span>
<span id="L190" class="LineNr">190 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>result<span class="Delimiter">)</span>
<span id="L191" class="LineNr">191 </span> <a href='003trace.cc.html#L226'>raise</a> << <span class="Constant">"address 0x"</span> << <a href='010---vm.cc.html#L401'>HEXWORD</a> << addr << <span class="Constant">" is in two segments\n"</span> << end<span class="Delimiter">();</span>
<span id="L192" class="LineNr">192 </span> result = &<span class="Special"><a href='010---vm.cc.html#L160'>Mem</a></span><span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>data<span class="Delimiter">(</span>addr<span class="Delimiter">);</span>
<span id="L193" class="LineNr">193 </span> <span class="Delimiter">}</span>
<span id="L194" class="LineNr">194 </span> <span class="Delimiter">}</span>
<span id="L195" class="LineNr">195 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>result == <span class="Constant">NULL</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L196" class="LineNr">196 </span> <span class="Normal">if</span> <span class="Delimiter">(</span><span class="Special"><a href='003trace.cc.html#L446'>Trace_file</a></span><span class="Delimiter">)</span> <span class="Special"><a href='003trace.cc.html#L446'>Trace_file</a></span><span class="Delimiter">.</span><a href='011run.cc.html#L199'>flush</a><span class="Delimiter">();</span>
<span id="L197" class="LineNr">197 </span> <a href='003trace.cc.html#L226'>raise</a> << <span class="Constant">"Tried to access uninitialized memory at address 0x"</span> << <a href='010---vm.cc.html#L401'>HEXWORD</a> << addr << <span class="cSpecial">'\n'</span> << end<span class="Delimiter">();</span>
<span id="L198" class="LineNr">198 </span> exit<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
<span id="L199" class="LineNr">199 </span> <span class="Delimiter">}</span>
<span id="L200" class="LineNr">200 </span> <span class="Identifier">return</span> result<span class="Delimiter">;</span>
<span id="L201" class="LineNr">201 </span><span class="Delimiter">}</span>
<span id="L202" class="LineNr">202 </span><span class="Normal">inline</span> <span class="Normal">int8_t</span>* <a href='010---vm.cc.html#L202'>mem_addr_i8</a><span class="Delimiter">(</span><span class="Normal">uint32_t</span> addr<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L203" class="LineNr">203 </span> <span class="Identifier">return</span> <span class="Normal">reinterpret_cast</span><<span class="Normal">int8_t</span>*><span class="Delimiter">(</span><a href='010---vm.cc.html#L186'>mem_addr_u8</a><span class="Delimiter">(</span>addr<span class="Delimiter">));</span>
<span id="L204" class="LineNr">204 </span><span class="Delimiter">}</span>
<span id="L205" class="LineNr">205 </span><span class="Normal">inline</span> <span class="Normal">uint32_t</span>* <a href='010---vm.cc.html#L205'>mem_addr_u32</a><span class="Delimiter">(</span><span class="Normal">uint32_t</span> addr<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L206" class="LineNr">206 </span> <span class="Normal">uint32_t</span>* result = <span class="Constant">NULL</span><span class="Delimiter">;</span>
<span id="L207" class="LineNr">207 </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 < <a href='001help.cc.html#L164'>SIZE</a><span class="Delimiter">(</span><span class="Special"><a href='010---vm.cc.html#L160'>Mem</a></span><span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L208" class="LineNr">208 </span> <span class="Normal">if</span> <span class="Delimiter">(</span><span class="Special"><a href='010---vm.cc.html#L160'>Mem</a></span><span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span><a href='010---vm.cc.html#L111'>match32</a><span class="Delimiter">(</span>addr<span class="Delimiter">))</span> <span class="Delimiter">{</span>
<span id="L209" class="LineNr">209 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>result<span class="Delimiter">)</span>
<span id="L210" class="LineNr">210 </span> <a href='003trace.cc.html#L226'>raise</a> << <span class="Constant">"address 0x"</span> << <a href='010---vm.cc.html#L401'>HEXWORD</a> << addr << <span class="Constant">" is in two segments\n"</span> << end<span class="Delimiter">();</span>
<span id="L211" class="LineNr">211 </span> result = <span class="Normal">reinterpret_cast</span><<span class="Normal">uint32_t</span>*><span class="Delimiter">(</span>&<span class="Special"><a href='010---vm.cc.html#L160'>Mem</a></span><span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>data<span class="Delimiter">(</span>addr<span class="Delimiter">));</span>
<span id="L212" class="LineNr">212 </span> <span class="Delimiter">}</span>
<span id="L213" class="LineNr">213 </span> <span class="Delimiter">}</span>
<span id="L214" class="LineNr">214 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>result == <span class="Constant">NULL</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L215" class="LineNr">215 </span> <span class="Normal">if</span> <span class="Delimiter">(</span><span class="Special"><a href='003trace.cc.html#L446'>Trace_file</a></span><span class="Delimiter">)</span> <span class="Special"><a href='003trace.cc.html#L446'>Trace_file</a></span><span class="Delimiter">.</span><a href='011run.cc.html#L199'>flush</a><span class="Delimiter">();</span>
<span id="L216" class="LineNr">216 </span> <a href='003trace.cc.html#L226'>raise</a> << <span class="Constant">"Tried to access uninitialized memory at address 0x"</span> << <a href='010---vm.cc.html#L401'>HEXWORD</a> << addr << <span class="cSpecial">'\n'</span> << end<span class="Delimiter">();</span>
<span id="L217" class="LineNr">217 </span> <a href='003trace.cc.html#L226'>raise</a> << <span class="Constant">"The entire 4-byte <a href='011run.cc.html#L128'>word</a> should be initialized and lie in a single segment.\n"</span> << end<span class="Delimiter">();</span>
<span id="L218" class="LineNr">218 </span> exit<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
<span id="L219" class="LineNr">219 </span> <span class="Delimiter">}</span>
<span id="L220" class="LineNr">220 </span> <span class="Identifier">return</span> result<span class="Delimiter">;</span>
<span id="L221" class="LineNr">221 </span><span class="Delimiter">}</span>
<span id="L222" class="LineNr">222 </span><span class="Normal">inline</span> <span class="Normal">int32_t</span>* <a href='010---vm.cc.html#L222'>mem_addr_i32</a><span class="Delimiter">(</span><span class="Normal">uint32_t</span> addr<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L223" class="LineNr">223 </span> <span class="Identifier">return</span> <span class="Normal">reinterpret_cast</span><<span class="Normal">int32_t</span>*><span class="Delimiter">(</span><a href='010---vm.cc.html#L205'>mem_addr_u32</a><span class="Delimiter">(</span>addr<span class="Delimiter">));</span>
<span id="L224" class="LineNr">224 </span><span class="Delimiter">}</span>
<span id="L225" class="LineNr">225 </span><span class="Comment">// helper for some syscalls. But read-only.</span>
<span id="L226" class="LineNr">226 </span><span class="Normal">inline</span> <span class="Normal">const</span> <span class="Normal">char</span>* <a href='010---vm.cc.html#L226'>mem_addr_kernel_string</a><span class="Delimiter">(</span><span class="Normal">uint32_t</span> addr<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L227" class="LineNr">227 </span> <span class="Identifier">return</span> <span class="Normal">reinterpret_cast</span><<span class="Normal">const</span> <span class="Normal">char</span>*><span class="Delimiter">(</span><a href='010---vm.cc.html#L186'>mem_addr_u8</a><span class="Delimiter">(</span>addr<span class="Delimiter">));</span>
<span id="L228" class="LineNr">228 </span><span class="Delimiter">}</span>
<span id="L229" class="LineNr">229 </span><span class="Normal">inline</span> string <a href='010---vm.cc.html#L229'>mem_addr_string</a><span class="Delimiter">(</span><span class="Normal">uint32_t</span> addr<span class="Delimiter">,</span> <span class="Normal">uint32_t</span> size<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L230" class="LineNr">230 </span> ostringstream out<span class="Delimiter">;</span>
<span id="L231" class="LineNr">231 </span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">size_t</span> i = <span class="Constant">0</span><span class="Delimiter">;</span> i < size<span class="Delimiter">;</span> ++i<span class="Delimiter">)</span>
<span id="L232" class="LineNr">232 </span> out << <a href='010---vm.cc.html#L171'>read_mem_u8</a><span class="Delimiter">(</span>addr+i<span class="Delimiter">);</span>
<span id="L233" class="LineNr">233 </span> <span class="Identifier">return</span> out<span class="Delimiter">.</span>str<span class="Delimiter">();</span>
<span id="L234" class="LineNr">234 </span><span class="Delimiter">}</span>
<span id="L235" class="LineNr">235 </span>
<span id="L236" class="LineNr">236 </span>
<span id="L237" class="LineNr">237 </span><span class="Normal">inline</span> <span class="Normal">void</span> <a href='010---vm.cc.html#L237'>write_mem_u8</a><span class="Delimiter">(</span><span class="Normal">uint32_t</span> addr<span class="Delimiter">,</span> <span class="Normal">uint8_t</span> val<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L238" class="LineNr">238 </span> <span class="Normal">uint8_t</span>* handle = <a href='010---vm.cc.html#L186'>mem_addr_u8</a><span class="Delimiter">(</span>addr<span class="Delimiter">);</span>
<span id="L239" class="LineNr">239 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>handle != <span class="Constant">NULL</span><span class="Delimiter">)</span> *handle = val<span class="Delimiter">;</span>
<span id="L240" class="LineNr">240 </span><span class="Delimiter">}</span>
<span id="L241" class="LineNr">241 </span><span class="Normal">inline</span> <span class="Normal">void</span> <a href='010---vm.cc.html#L241'>write_mem_i8</a><span class="Delimiter">(</span><span class="Normal">uint32_t</span> addr<span class="Delimiter">,</span> <span class="Normal">int8_t</span> val<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L242" class="LineNr">242 </span> <span class="Normal">int8_t</span>* handle = <a href='010---vm.cc.html#L202'>mem_addr_i8</a><span class="Delimiter">(</span>addr<span class="Delimiter">);</span>
<span id="L243" class="LineNr">243 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>handle != <span class="Constant">NULL</span><span class="Delimiter">)</span> *handle = val<span class="Delimiter">;</span>
<span id="L244" class="LineNr">244 </span><span class="Delimiter">}</span>
<span id="L245" class="LineNr">245 </span><span class="Normal">inline</span> <span class="Normal">void</span> <a href='010---vm.cc.html#L245'>write_mem_u32</a><span class="Delimiter">(</span><span class="Normal">uint32_t</span> addr<span class="Delimiter">,</span> <span class="Normal">uint32_t</span> val<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L246" class="LineNr">246 </span> <span class="Normal">uint32_t</span>* handle = <a href='010---vm.cc.html#L205'>mem_addr_u32</a><span class="Delimiter">(</span>addr<span class="Delimiter">);</span>
<span id="L247" class="LineNr">247 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>handle != <span class="Constant">NULL</span><span class="Delimiter">)</span> *handle = val<span class="Delimiter">;</span>
<span id="L248" class="LineNr">248 </span><span class="Delimiter">}</span>
<span id="L249" class="LineNr">249 </span><span class="Normal">inline</span> <span class="Normal">void</span> <a href='010---vm.cc.html#L249'>write_mem_i32</a><span class="Delimiter">(</span><span class="Normal">uint32_t</span> addr<span class="Delimiter">,</span> <span class="Normal">int32_t</span> val<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L250" class="LineNr">250 </span> <span class="Normal">int32_t</span>* handle = <a href='010---vm.cc.html#L222'>mem_addr_i32</a><span class="Delimiter">(</span>addr<span class="Delimiter">);</span>
<span id="L251" class="LineNr">251 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>handle != <span class="Constant">NULL</span><span class="Delimiter">)</span> *handle = val<span class="Delimiter">;</span>
<span id="L252" class="LineNr">252 </span><span class="Delimiter">}</span>
<span id="L253" class="LineNr">253 </span>
<span id="L254" class="LineNr">254 </span><span class="Normal">inline</span> <span class="Normal">bool</span> <a href='010---vm.cc.html#L254'>already_allocated</a><span class="Delimiter">(</span><span class="Normal">uint32_t</span> addr<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L255" class="LineNr">255 </span> <span class="Normal">bool</span> result = <span class="Constant">false</span><span class="Delimiter">;</span>
<span id="L256" class="LineNr">256 </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 < <a href='001help.cc.html#L164'>SIZE</a><span class="Delimiter">(</span><span class="Special"><a href='010---vm.cc.html#L160'>Mem</a></span><span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L257" class="LineNr">257 </span> <span class="Normal">if</span> <span class="Delimiter">(</span><span class="Special"><a href='010---vm.cc.html#L160'>Mem</a></span><span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span><a href='010---vm.cc.html#L108'>match</a><span class="Delimiter">(</span>addr<span class="Delimiter">))</span> <span class="Delimiter">{</span>
<span id="L258" class="LineNr">258 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>result<span class="Delimiter">)</span>
<span id="L259" class="LineNr">259 </span> <a href='003trace.cc.html#L226'>raise</a> << <span class="Constant">"address 0x"</span> << <a href='010---vm.cc.html#L401'>HEXWORD</a> << addr << <span class="Constant">" is in two segments\n"</span> << end<span class="Delimiter">();</span>
<span id="L260" class="LineNr">260 </span> result = <span class="Constant">true</span><span class="Delimiter">;</span>
<span id="L261" class="LineNr">261 </span> <span class="Delimiter">}</span>
<span id="L262" class="LineNr">262 </span> <span class="Delimiter">}</span>
<span id="L263" class="LineNr">263 </span> <span class="Identifier">return</span> result<span class="Delimiter">;</span>
<span id="L264" class="LineNr">264 </span><span class="Delimiter">}</span>
<span id="L265" class="LineNr">265 </span>
<span id="L266" class="LineNr">266 </span><span class="SalientComment">//:: core interpreter loop</span>
<span id="L267" class="LineNr">267 </span>
<span id="L268" class="LineNr">268 </span><span class="Delimiter">:(code)</span>
<span id="L269" class="LineNr">269 </span><span class="Comment">// skeleton of how x86 instructions are decoded</span>
<span id="L270" class="LineNr">270 </span><span class="Normal">void</span> <a href='010---vm.cc.html#L270'>run_one_instruction</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
<span id="L271" class="LineNr">271 </span> <span class="Normal">uint8_t</span> op=<span class="Constant">0</span><span class="Delimiter">,</span> op2=<span class="Constant">0</span><span class="Delimiter">,</span> op3=<span class="Constant">0</span><span class="Delimiter">;</span>
<span id="L272" class="LineNr">272 </span> <span class="Comment">// Run One Instruction</span>
<span id="L273" class="LineNr">273 </span> <span class="Normal">if</span> <span class="Delimiter">(</span><span class="Special"><a href='003trace.cc.html#L446'>Trace_file</a></span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L274" class="LineNr">274 </span> <a href='010---vm.cc.html#L335'>dump_registers</a><span class="Delimiter">();</span>
<span id="L275" class="LineNr">275 </span> <span class="Comment">// End Dump Info for Instruction</span>
<span id="L276" class="LineNr">276 </span> <span class="Delimiter">}</span>
<span id="L277" class="LineNr">277 </span> <span class="Normal">uint32_t</span> inst_start_address = <a href='010---vm.cc.html#L32'>EIP</a><span class="Delimiter">;</span>
<span id="L278" class="LineNr">278 </span> op = <a href='010---vm.cc.html#L331'>next</a><span class="Delimiter">();</span>
<span id="L279" class="LineNr">279 </span> <a href='003trace.cc.html#L96'>trace</a><span class="Delimiter">(</span><span class="Special">Callstack_depth</span>+<span class="Constant">1</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"0x"</span> << <a href='010---vm.cc.html#L401'>HEXWORD</a> << inst_start_address << <span class="Constant">" opcode: "</span> << <a href='010---vm.cc.html#L400'>HEXBYTE</a> << <a href='010---vm.cc.html#L403'>NUM</a><span class="Delimiter">(</span>op<span class="Delimiter">)</span> << end<span class="Delimiter">();</span>
<span id="L280" class="LineNr">280 </span> <span class="Normal">switch</span> <span class="Delimiter">(</span>op<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L281" class="LineNr">281 </span> <span class="Normal">case</span> <span class="Constant">0xf4</span>: <span class="Comment">// hlt</span>
<span id="L282" class="LineNr">282 </span> <a href='010---vm.cc.html#L32'>EIP</a> = <span class="Special"><a href='010---vm.cc.html#L163'>End_of_program</a></span><span class="Delimiter">;</span>
<span id="L283" class="LineNr">283 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L284" class="LineNr">284 </span> <span class="Comment">// End Single-Byte Opcodes</span>
<span id="L285" class="LineNr">285 </span> <span class="Normal">case</span> <span class="Constant">0x0f</span>:
<span id="L286" class="LineNr">286 </span> <span class="Normal">switch</span><span class="Delimiter">(</span>op2 = <a href='010---vm.cc.html#L331'>next</a><span class="Delimiter">())</span> <span class="Delimiter">{</span>
<span id="L287" class="LineNr">287 </span> <span class="Comment">// End Two-Byte Opcodes Starting With 0f</span>
<span id="L288" class="LineNr">288 </span> <span class="Normal">default</span>:
<span id="L289" class="LineNr">289 </span> cerr << <span class="Constant">"unrecognized second opcode after 0f: "</span> << <a href='010---vm.cc.html#L400'>HEXBYTE</a> << <a href='010---vm.cc.html#L403'>NUM</a><span class="Delimiter">(</span>op2<span class="Delimiter">)</span> << <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
<span id="L290" class="LineNr">290 </span> exit<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
<span id="L291" class="LineNr">291 </span> <span class="Delimiter">}</span>
<span id="L292" class="LineNr">292 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L293" class="LineNr">293 </span> <span class="Normal">case</span> <span class="Constant">0xf2</span>:
<span id="L294" class="LineNr">294 </span> <span class="Normal">switch</span><span class="Delimiter">(</span>op2 = <a href='010---vm.cc.html#L331'>next</a><span class="Delimiter">())</span> <span class="Delimiter">{</span>
<span id="L295" class="LineNr">295 </span> <span class="Comment">// End Two-Byte Opcodes Starting With f2</span>
<span id="L296" class="LineNr">296 </span> <span class="Normal">case</span> <span class="Constant">0x0f</span>:
<span id="L297" class="LineNr">297 </span> <span class="Normal">switch</span><span class="Delimiter">(</span>op3 = <a href='010---vm.cc.html#L331'>next</a><span class="Delimiter">())</span> <span class="Delimiter">{</span>
<span id="L298" class="LineNr">298 </span> <span class="Comment">// End Three-Byte Opcodes Starting With f2 0f</span>
<span id="L299" class="LineNr">299 </span> <span class="Normal">default</span>:
<span id="L300" class="LineNr">300 </span> cerr << <span class="Constant">"unrecognized third opcode after f2 0f: "</span> << <a href='010---vm.cc.html#L400'>HEXBYTE</a> << <a href='010---vm.cc.html#L403'>NUM</a><span class="Delimiter">(</span>op3<span class="Delimiter">)</span> << <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
<span id="L301" class="LineNr">301 </span> exit<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
<span id="L302" class="LineNr">302 </span> <span class="Delimiter">}</span>
<span id="L303" class="LineNr">303 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L304" class="LineNr">304 </span> <span class="Normal">default</span>:
<span id="L305" class="LineNr">305 </span> cerr << <span class="Constant">"unrecognized second opcode after f2: "</span> << <a href='010---vm.cc.html#L400'>HEXBYTE</a> << <a href='010---vm.cc.html#L403'>NUM</a><span class="Delimiter">(</span>op2<span class="Delimiter">)</span> << <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
<span id="L306" class="LineNr">306 </span> exit<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
<span id="L307" class="LineNr">307 </span> <span class="Delimiter">}</span>
<span id="L308" class="LineNr">308 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L309" class="LineNr">309 </span> <span class="Normal">case</span> <span class="Constant">0xf3</span>:
<span id="L310" class="LineNr">310 </span> <span class="Normal">switch</span><span class="Delimiter">(</span>op2 = <a href='010---vm.cc.html#L331'>next</a><span class="Delimiter">())</span> <span class="Delimiter">{</span>
<span id="L311" class="LineNr">311 </span> <span class="Comment">// End Two-Byte Opcodes Starting With f3</span>
<span id="L312" class="LineNr">312 </span> <span class="Normal">case</span> <span class="Constant">0x0f</span>:
<span id="L313" class="LineNr">313 </span> <span class="Normal">switch</span><span class="Delimiter">(</span>op3 = <a href='010---vm.cc.html#L331'>next</a><span class="Delimiter">())</span> <span class="Delimiter">{</span>
<span id="L314" class="LineNr">314 </span> <span class="Comment">// End Three-Byte Opcodes Starting With f3 0f</span>
<span id="L315" class="LineNr">315 </span> <span class="Normal">default</span>:
<span id="L316" class="LineNr">316 </span> cerr << <span class="Constant">"unrecognized third opcode after f3 0f: "</span> << <a href='010---vm.cc.html#L400'>HEXBYTE</a> << <a href='010---vm.cc.html#L403'>NUM</a><span class="Delimiter">(</span>op3<span class="Delimiter">)</span> << <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
<span id="L317" class="LineNr">317 </span> exit<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
<span id="L318" class="LineNr">318 </span> <span class="Delimiter">}</span>
<span id="L319" class="LineNr">319 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L320" class="LineNr">320 </span> <span class="Normal">default</span>:
<span id="L321" class="LineNr">321 </span> cerr << <span class="Constant">"unrecognized second opcode after f3: "</span> << <a href='010---vm.cc.html#L400'>HEXBYTE</a> << <a href='010---vm.cc.html#L403'>NUM</a><span class="Delimiter">(</span>op2<span class="Delimiter">)</span> << <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
<span id="L322" class="LineNr">322 </span> exit<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
<span id="L323" class="LineNr">323 </span> <span class="Delimiter">}</span>
<span id="L324" class="LineNr">324 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L325" class="LineNr">325 </span> <span class="Normal">default</span>:
<span id="L326" class="LineNr">326 </span> cerr << <span class="Constant">"unrecognized opcode: "</span> << <a href='010---vm.cc.html#L400'>HEXBYTE</a> << <a href='010---vm.cc.html#L403'>NUM</a><span class="Delimiter">(</span>op<span class="Delimiter">)</span> << <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
<span id="L327" class="LineNr">327 </span> exit<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
<span id="L328" class="LineNr">328 </span> <span class="Delimiter">}</span>
<span id="L329" class="LineNr">329 </span><span class="Delimiter">}</span>
<span id="L330" class="LineNr">330 </span>
<span id="L331" class="LineNr">331 </span><span class="Normal">inline</span> <span class="Normal">uint8_t</span> <a href='010---vm.cc.html#L331'>next</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
<span id="L332" class="LineNr">332 </span> <span class="Identifier">return</span> <a href='010---vm.cc.html#L171'>read_mem_u8</a><span class="Delimiter">(</span>EIP++<span class="Delimiter">);</span>
<span id="L333" class="LineNr">333 </span><span class="Delimiter">}</span>
<span id="L334" class="LineNr">334 </span>
<span id="L335" class="LineNr">335 </span><span class="Normal">void</span> <a href='010---vm.cc.html#L335'>dump_registers</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
<span id="L336" class="LineNr">336 </span> ostringstream out<span class="Delimiter">;</span>
<span id="L337" class="LineNr">337 </span> out << <span class="Constant">"registers before: "</span><span class="Delimiter">;</span>
<span id="L338" class="LineNr">338 </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 < <a href='010---vm.cc.html#L24'>NUM_INT_REGISTERS</a><span class="Delimiter">;</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L339" class="LineNr">339 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>i > <span class="Constant">0</span><span class="Delimiter">)</span> out << <span class="Constant">"; "</span><span class="Delimiter">;</span>
<span id="L340" class="LineNr">340 </span> out << <span class="Constant">" "</span> << i << <span class="Constant">": "</span> << std::hex << std::setw<span class="Delimiter">(</span><span class="Constant">8</span><span class="Delimiter">)</span> << std::setfill<span class="Delimiter">(</span><span class="Constant">'_'</span><span class="Delimiter">)</span> << <span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span>[i]<span class="Delimiter">.</span>u<span class="Delimiter">;</span>
<span id="L341" class="LineNr">341 </span> <span class="Delimiter">}</span>
<span id="L342" class="LineNr">342 </span> out << <span class="Constant">" -- SF: "</span> << SF << <span class="Constant">"; <a href='010---vm.cc.html#L86'>ZF</a>: "</span> << <a href='010---vm.cc.html#L86'>ZF</a> << <span class="Constant">"; <a href='010---vm.cc.html#L87'>CF</a>: "</span> << <a href='010---vm.cc.html#L87'>CF</a> << <span class="Constant">"; <a href='010---vm.cc.html#L88'>OF</a>: "</span> << <a href='010---vm.cc.html#L88'>OF</a><span class="Delimiter">;</span>
<span id="L343" class="LineNr">343 </span> <a href='003trace.cc.html#L96'>trace</a><span class="Delimiter">(</span><span class="Special">Callstack_depth</span>+<span class="Constant">1</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << out<span class="Delimiter">.</span>str<span class="Delimiter">()</span> << end<span class="Delimiter">();</span>
<span id="L344" class="LineNr">344 </span><span class="Delimiter">}</span>
<span id="L345" class="LineNr">345 </span>
<span id="L346" class="LineNr">346 </span><span class="Comment">//: start tracking supported opcodes</span>
<span id="L347" class="LineNr">347 </span><span class="Delimiter">:(before "End Globals")</span>
<span id="L348" class="LineNr">348 </span>map<<span class="Comment">/*</span><span class="Comment">op</span><span class="Comment">*/</span>string<span class="Delimiter">,</span> string> <span class="Special"><a href='010---vm.cc.html#L348'>Name</a></span><span class="Delimiter">;</span>
<span id="L349" class="LineNr">349 </span>map<<span class="Comment">/*</span><span class="Comment">op</span><span class="Comment">*/</span>string<span class="Delimiter">,</span> string> <span class="Special"><a href='010---vm.cc.html#L349'>Name_0f</a></span><span class="Delimiter">;</span>
<span id="L350" class="LineNr">350 </span>map<<span class="Comment">/*</span><span class="Comment">op</span><span class="Comment">*/</span>string<span class="Delimiter">,</span> string> <span class="Special"><a href='010---vm.cc.html#L350'>Name_f3</a></span><span class="Delimiter">;</span>
<span id="L351" class="LineNr">351 </span>map<<span class="Comment">/*</span><span class="Comment">op</span><span class="Comment">*/</span>string<span class="Delimiter">,</span> string> <span class="Special"><a href='010---vm.cc.html#L351'>Name_f3_0f</a></span><span class="Delimiter">;</span>
<span id="L352" class="LineNr">352 </span><span class="Delimiter">:(before "End One-time Setup")</span>
<span id="L353" class="LineNr">353 </span><a href='010---vm.cc.html#L355'>init_op_names</a><span class="Delimiter">();</span>
<span id="L354" class="LineNr">354 </span><span class="Delimiter">:(code)</span>
<span id="L355" class="LineNr">355 </span><span class="Normal">void</span> <a href='010---vm.cc.html#L355'>init_op_names</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
<span id="L356" class="LineNr">356 </span> <a href='001help.cc.html#L250'>put</a><span class="Delimiter">(</span><span class="Special"><a href='010---vm.cc.html#L348'>Name</a></span><span class="Delimiter">,</span> <span class="Constant">"f4"</span><span class="Delimiter">,</span> <span class="Constant">"halt (hlt)"</span><span class="Delimiter">);</span>
<span id="L357" class="LineNr">357 </span> <span class="Comment">// End Initialize Op Names</span>
<span id="L358" class="LineNr">358 </span><span class="Delimiter">}</span>
<span id="L359" class="LineNr">359 </span>
<span id="L360" class="LineNr">360 </span><span class="Delimiter">:(before "End <a href='001help.cc.html#L53'>Help</a> Special-cases(key)")</span>
<span id="L361" class="LineNr">361 </span><span class="Normal">if</span> <span class="Delimiter">(</span>key == <span class="Constant">"opcodes"</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L362" class="LineNr">362 </span> cerr << <span class="Constant">"Opcodes currently supported by SubX:\n"</span><span class="Delimiter">;</span>
<span id="L363" class="LineNr">363 </span> <span class="Normal">for</span> <span class="Delimiter">(</span>map<string<span class="Delimiter">,</span> string>::iterator p = <span class="Special"><a href='010---vm.cc.html#L348'>Name</a></span><span class="Delimiter">.</span>begin<span class="Delimiter">();</span> p != <span class="Special"><a href='010---vm.cc.html#L348'>Name</a></span><span class="Delimiter">.</span>end<span class="Delimiter">();</span> ++p<span class="Delimiter">)</span>
<span id="L364" class="LineNr">364 </span> cerr << <span class="Constant">" "</span> << p<span class="Delimiter">-></span>first << <span class="Constant">": "</span> << p<span class="Delimiter">-></span>second << <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
<span id="L365" class="LineNr">365 </span> <span class="Normal">for</span> <span class="Delimiter">(</span>map<string<span class="Delimiter">,</span> string>::iterator p = <span class="Special"><a href='010---vm.cc.html#L349'>Name_0f</a></span><span class="Delimiter">.</span>begin<span class="Delimiter">();</span> p != <span class="Special"><a href='010---vm.cc.html#L349'>Name_0f</a></span><span class="Delimiter">.</span>end<span class="Delimiter">();</span> ++p<span class="Delimiter">)</span>
<span id="L366" class="LineNr">366 </span> cerr << <span class="Constant">" 0f "</span> << p<span class="Delimiter">-></span>first << <span class="Constant">": "</span> << p<span class="Delimiter">-></span>second << <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
<span id="L367" class="LineNr">367 </span> <span class="Normal">for</span> <span class="Delimiter">(</span>map<string<span class="Delimiter">,</span> string>::iterator p = <span class="Special"><a href='010---vm.cc.html#L350'>Name_f3</a></span><span class="Delimiter">.</span>begin<span class="Delimiter">();</span> p != <span class="Special"><a href='010---vm.cc.html#L350'>Name_f3</a></span><span class="Delimiter">.</span>end<span class="Delimiter">();</span> ++p<span class="Delimiter">)</span>
<span id="L368" class="LineNr">368 </span> cerr << <span class="Constant">" f3 "</span> << p<span class="Delimiter">-></span>first << <span class="Constant">": "</span> << p<span class="Delimiter">-></span>second << <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
<span id="L369" class="LineNr">369 </span> <span class="Normal">for</span> <span class="Delimiter">(</span>map<string<span class="Delimiter">,</span> string>::iterator p = <span class="Special"><a href='010---vm.cc.html#L351'>Name_f3_0f</a></span><span class="Delimiter">.</span>begin<span class="Delimiter">();</span> p != <span class="Special"><a href='010---vm.cc.html#L351'>Name_f3_0f</a></span><span class="Delimiter">.</span>end<span class="Delimiter">();</span> ++p<span class="Delimiter">)</span>
<span id="L370" class="LineNr">370 </span> cerr << <span class="Constant">" f3 0f "</span> << p<span class="Delimiter">-></span>first << <span class="Constant">": "</span> << p<span class="Delimiter">-></span>second << <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
<span id="L371" class="LineNr">371 </span> cerr << <span class="Constant">"Run `subx help instructions` for details on <a href='011run.cc.html#L123'>words</a> like 'r32' and 'disp8'.\n"</span>
<span id="L372" class="LineNr">372 </span> <span class="Constant">"For complete details on these instructions, consult the IA-32 manual (volume 2).\n"</span>
<span id="L373" class="LineNr">373 </span> <span class="Constant">"There's various versions of it online, such as <a href="https://c9x.me/x86.">https://c9x.me/x86.</a>\n"</span>
<span id="L374" class="LineNr">374 </span> <span class="Constant">"The mnemonics in brackets will help you locate each instruction.\n"</span><span class="Delimiter">;</span>
<span id="L375" class="LineNr">375 </span> <span class="Identifier">return</span> <span class="Constant">0</span><span class="Delimiter">;</span>
<span id="L376" class="LineNr">376 </span><span class="Delimiter">}</span>
<span id="L377" class="LineNr">377 </span><span class="Delimiter">:(before "End <a href='001help.cc.html#L53'>Help</a> Contents")</span>
<span id="L378" class="LineNr">378 </span>cerr << <span class="Constant">" opcodes\n"</span><span class="Delimiter">;</span>
<span id="L379" class="LineNr">379 </span>
<span id="L380" class="LineNr">380 </span><span class="Comment">//: Helpers for managing trace depths</span>
<span id="L381" class="LineNr">381 </span><span class="Comment">//:</span>
<span id="L382" class="LineNr">382 </span><span class="Comment">//: We're going to use trace depths primarily to segment code running at</span>
<span id="L383" class="LineNr">383 </span><span class="Comment">//: different frames of the call stack. This will make it easy for the trace</span>
<span id="L384" class="LineNr">384 </span><span class="Comment">//: browser to collapse over entire calls.</span>
<span id="L385" class="LineNr">385 </span><span class="Comment">//:</span>
<span id="L386" class="LineNr">386 </span><span class="Comment">//: Errors will be at depth 0.</span>
<span id="L387" class="LineNr">387 </span><span class="Comment">//: Warnings will be at depth 1.</span>
<span id="L388" class="LineNr">388 </span><span class="Comment">//: SubX instructions will occupy depth 2 and up to Max_depth, organized by</span>
<span id="L389" class="LineNr">389 </span><span class="Comment">//: stack frames. Each instruction's internal details will be one level deeper</span>
<span id="L390" class="LineNr">390 </span><span class="Comment">//: than its 'main' depth. So 'call' instruction details will be at the same</span>
<span id="L391" class="LineNr">391 </span><span class="Comment">//: depth as the instructions of the function it calls.</span>
<span id="L392" class="LineNr">392 </span><span class="Delimiter">:(before "End Globals")</span>
<span id="L393" class="LineNr">393 </span><span class="Normal">extern</span> <span class="Normal">const</span> <span class="Normal">int</span> <span class="Special"><a href='010---vm.cc.html#L393'>Initial_callstack_depth</a></span> = <span class="Constant">2</span><span class="Delimiter">;</span>
<span id="L394" class="LineNr">394 </span><span class="Normal">int</span> <span class="Special">Callstack_depth</span> = <span class="Special"><a href='010---vm.cc.html#L393'>Initial_callstack_depth</a></span><span class="Delimiter">;</span>
<span id="L395" class="LineNr">395 </span><span class="Delimiter">:(before "End Reset")</span>
<span id="L396" class="LineNr">396 </span><span class="Special">Callstack_depth</span> = <span class="Special"><a href='010---vm.cc.html#L393'>Initial_callstack_depth</a></span><span class="Delimiter">;</span>
<span id="L397" class="LineNr">397 </span>
<span id="L398" class="LineNr">398 </span><span class="Delimiter">:(before "End Includes")</span>
<span id="L399" class="LineNr">399 </span><span class="PreProc">#include </span><span class="Constant"><iomanip></span>
<span id="L400" class="LineNr">400 </span><span class="PreProc">#define HEXBYTE std::hex << std::setw(</span><span class="Constant">2</span><span class="PreProc">) << std::setfill(</span><span class="Constant">'0'</span><span class="PreProc">)</span>
<span id="L401" class="LineNr">401 </span><span class="PreProc">#define HEXWORD std::hex << std::setw(</span><span class="Constant">8</span><span class="PreProc">) << std::setfill(</span><span class="Constant">'0'</span><span class="PreProc">)</span>
<span id="L402" class="LineNr">402 </span><span class="Comment">// ugly that iostream doesn't print uint8_t as an integer</span>
<span id="L403" class="LineNr">403 </span><span class="PreProc">#define NUM(</span><span class="Special">X</span><span class="PreProc">) </span><span class="Normal">static_cast</span><span class="PreProc"><</span><span class="Normal">int</span><span class="PreProc">>(</span><span class="Special">X</span><span class="PreProc">)</span>
<span id="L404" class="LineNr">404 </span><span class="PreProc">#include </span><span class="Constant"><stdint.h></span>
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