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<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="Comment">//: Running SubX programs on the VM.</span>
<span id="L2" class="LineNr"> 2 </span>
<span id="L3" class="LineNr"> 3 </span><span class="Comment">//: (Not to be confused with the 'run' subcommand for running ELF binaries on</span>
<span id="L4" class="LineNr"> 4 </span><span class="Comment">//: the VM. That comes later.)</span>
<span id="L5" class="LineNr"> 5 </span>
<span id="L6" class="LineNr"> 6 </span><span class="Delimiter">:(before "End <a href='001help.cc.html#L53'>Help</a> Texts")</span>
<span id="L7" class="LineNr"> 7 </span><a href='001help.cc.html#L243'>put</a><span class="Delimiter">(</span><a href='001help.cc.html#L53'>Help</a><span class="Delimiter">,</span> <span class="Constant">"syntax"</span><span class="Delimiter">,</span>
<span id="L8" class="LineNr"> 8 </span> <span class="Constant">"SubX programs consist of <a href='011run.cc.html#L100'>segments</a>, each segment in turn consisting of lines.</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L9" class="LineNr"> 9 </span> <span class="Constant">"Line-endings are significant; each <a href='011run.cc.html#L117'>line</a> should contain a single</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L10" class="LineNr"> 10 </span> <span class="Constant">"instruction, macro or directive.</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L11" class="LineNr"> 11 </span> <span class="Constant">"</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L12" class="LineNr"> 12 </span> <span class="Constant">"Comments start with the '#' character. It should be at the start of a <a href='011run.cc.html#L123'>word</a></span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L13" class="LineNr"> 13 </span> <span class="Constant">"(start of <a href='011run.cc.html#L117'>line</a>, or following a space).</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L14" class="LineNr"> 14 </span> <span class="Constant">"</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L15" class="LineNr"> 15 </span> <span class="Constant">"Each segment starts with a header <a href='011run.cc.html#L117'>line</a>: a '==' delimiter followed by the</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L16" class="LineNr"> 16 </span> <span class="Constant">"starting address for the segment.</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L17" class="LineNr"> 17 </span> <span class="Constant">"</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L18" class="LineNr"> 18 </span> <span class="Constant">"The starting address for a segment has some finicky requirements. But just</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L19" class="LineNr"> 19 </span> <span class="Constant">"start with a round number, and `subx` will try to guide you to a valid</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L20" class="LineNr"> 20 </span> <span class="Constant">"configuration.</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L21" class="LineNr"> 21 </span> <span class="Constant">"A good rule of thumb is to try to start the first segment at the default</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L22" class="LineNr"> 22 </span> <span class="Constant">"address of 0x08048000, and to start each subsequent segment at least 0x1000</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L23" class="LineNr"> 23 </span> <span class="Constant">"(most common page size) bytes after the last.</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L24" class="LineNr"> 24 </span> <span class="Constant">"If a segment occupies than 0x1000 bytes you'll need to push subsequent</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L25" class="LineNr"> 25 </span> <span class="Constant">"segments further down.</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L26" class="LineNr"> 26 </span> <span class="Constant">"Currently only the first segment contains executable <a href='031check_operands.cc.html#L14'>code</a> (because it gets</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L27" class="LineNr"> 27 </span> <span class="Constant">"annoying to have to change addresses in later <a href='011run.cc.html#L100'>segments</a> every time an earlier</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L28" class="LineNr"> 28 </span> <span class="Constant">"one changes length; one of those finicky requirements).</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L29" class="LineNr"> 29 </span> <span class="Constant">"</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L30" class="LineNr"> 30 </span> <span class="Constant">"Lines consist of a series of words. Words can contain arbitrary metadata</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L31" class="LineNr"> 31 </span> <span class="Constant">"after a '/', but they can never contain whitespace. Metadata has no effect</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L32" class="LineNr"> 32 </span> <span class="Constant">"at runtime, but can be handy when rewriting macros.</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L33" class="LineNr"> 33 </span> <span class="Constant">"</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L34" class="LineNr"> 34 </span> <span class="Constant">"Check out some examples in this directory (ex*.subx)</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L35" class="LineNr"> 35 </span> <span class="Constant">"Programming in machine <a href='031check_operands.cc.html#L14'>code</a> can be annoying, but let's see if we can make</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L36" class="LineNr"> 36 </span> <span class="Constant">"it nice enough to be able to write a compiler in it.</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L37" class="LineNr"> 37 </span><span class="Delimiter">);</span>
<span id="L38" class="LineNr"> 38 </span><span class="Delimiter">:(before "End <a href='001help.cc.html#L53'>Help</a> Contents")</span>
<span id="L39" class="LineNr"> 39 </span>cerr << <span class="Constant">" syntax</span><span class="cSpecial">\n</span><span class="Constant">"</span><span class="Delimiter">;</span>
<span id="L40" class="LineNr"> 40 </span>
<span id="L41" class="LineNr"> 41 </span><span class="Delimiter">:(scenario add_imm32_to_eax)</span>
<span id="L42" class="LineNr"> 42 </span><span class="Comment"># At the lowest level, SubX programs are a series of hex bytes, each</span>
<span id="L43" class="LineNr"> 43 </span><span class="Comment"># (variable-length) instruction on one line.</span>
<span id="L44" class="LineNr"> 44 </span><span class="Comment">#</span>
<span id="L45" class="LineNr"> 45 </span><span class="Comment"># Later we'll make things nicer using macros. But you'll always be able to</span>
<span id="L46" class="LineNr"> 46 </span><span class="Comment"># insert hex bytes out of instructions.</span>
<span id="L47" class="LineNr"> 47 </span><span class="Comment">#</span>
<span id="L48" class="LineNr"> 48 </span><span class="Comment"># As you can see, comments start with '#' and are ignored.</span>
<span id="L49" class="LineNr"> 49 </span>
<span id="L50" class="LineNr"> 50 </span><span class="Comment"># Segment headers start with '==', specifying the hex address where they</span>
<span id="L51" class="LineNr"> 51 </span><span class="Comment"># begin. There's usually one code segment and one data segment. We assume the</span>
<span id="L52" class="LineNr"> 52 </span><span class="Comment"># code segment always comes first. Later when we emit ELF binaries we'll add</span>
<span id="L53" class="LineNr"> 53 </span><span class="Comment"># directives for the operating system to ensure that the code segment can't be</span>
<span id="L54" class="LineNr"> 54 </span><span class="Comment"># written to, and the data segment can't be executed as code.</span>
<span id="L55" class="LineNr"> 55 </span>== <span class="Constant">0x1</span>
<span id="L56" class="LineNr"> 56 </span>
<span id="L57" class="LineNr"> 57 </span><span class="Comment"># We don't show it here, but all lines can have metadata after a ':'.</span>
<span id="L58" class="LineNr"> 58 </span><span class="Comment"># All words can have metadata after a '/'. No spaces allowed in word metadata, of course.</span>
<span id="L59" class="LineNr"> 59 </span><span class="Comment"># Metadata doesn't directly form instructions, but some macros may look at it.</span>
<span id="L60" class="LineNr"> 60 </span><span class="Comment"># Unrecognized metadata never causes errors, so you can also use it for</span>
<span id="L61" class="LineNr"> 61 </span><span class="Comment"># documentation.</span>
<span id="L62" class="LineNr"> 62 </span>
<span id="L63" class="LineNr"> 63 </span><span class="Comment"># Within the code segment, x86 instructions consist of the following parts (see cheatsheet.pdf):</span>
<span id="L64" class="LineNr"> 64 </span><span class="Comment"># opcode ModR/M SIB displacement immediate</span>
<span id="L65" class="LineNr"> 65 </span><span class="Comment"># instruction mod, reg, Reg/Mem bits scale, index, base</span>
<span id="L66" class="LineNr"> 66 </span><span class="Comment"># 1-3 bytes 0/1 byte 0/1 byte 0/1/2/4 bytes 0/1/2/4 bytes</span>
<span id="L67" class="LineNr"> 67 </span> <span class="PreProc">0</span><span class="Constant">5</span> <span class="Delimiter">.</span> <span class="Delimiter">.</span> <span class="Delimiter">.</span> 0a 0b 0c 0d <span class="Comment"># add 0x0d0c0b0a to EAX</span>
<span id="L68" class="LineNr"> 68 </span><span class="Comment"># (The single periods are just to help the eye track long gaps between</span>
<span id="L69" class="LineNr"> 69 </span><span class="Comment"># columns, and are otherwise ignored.)</span>
<span id="L70" class="LineNr"> 70 </span>
<span id="L71" class="LineNr"> 71 </span><span class="Comment"># This program, when run, causes the following events in the trace:</span>
<span id="L72" class="LineNr"> 72 </span><span class="traceContains">+load: 0x00000001 -> 05</span>
<span id="L73" class="LineNr"> 73 </span><span class="traceContains">+load: 0x00000002 -> 0a</span>
<span id="L74" class="LineNr"> 74 </span><span class="traceContains">+load: 0x00000003 -> 0b</span>
<span id="L75" class="LineNr"> 75 </span><span class="traceContains">+load: 0x00000004 -> 0c</span>
<span id="L76" class="LineNr"> 76 </span><span class="traceContains">+load: 0x00000005 -> 0d</span>
<span id="L77" class="LineNr"> 77 </span><span class="traceContains">+run: add imm32 0x0d0c0b0a to <a href='010---vm.cc.html#L23'>reg</a> <a href='010---vm.cc.html#L13'>EAX</a></span>
<span id="L78" class="LineNr"> 78 </span><span class="traceContains">+run: storing 0x0d0c0b0a</span>
<span id="L79" class="LineNr"> 79 </span>
<span id="L80" class="LineNr"> 80 </span><span class="Delimiter">:(code)</span>
<span id="L81" class="LineNr"> 81 </span><span class="Comment">// top-level helper for scenarios: parse the input, transform any macros, load</span>
<span id="L82" class="LineNr"> 82 </span><span class="Comment">// the final hex bytes into memory, run it</span>
<span id="L83" class="LineNr"> 83 </span><span class="Normal">void</span> <a href='011run.cc.html#L83'>run</a><span class="Delimiter">(</span><span class="Normal">const</span> string& text_bytes<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L84" class="LineNr"> 84 </span> <a href='011run.cc.html#L99'>program</a> p<span class="Delimiter">;</span>
<span id="L85" class="LineNr"> 85 </span> istringstream in<span class="Delimiter">(</span>text_bytes<span class="Delimiter">);</span>
<span id="L86" class="LineNr"> 86 </span> parse<span class="Delimiter">(</span>in<span class="Delimiter">,</span> p<span class="Delimiter">);</span>
<span id="L87" class="LineNr"> 87 </span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='003trace.cc.html#L225'>trace_contains_errors</a><span class="Delimiter">())</span> <span class="Identifier">return</span><span class="Delimiter">;</span> <span class="Comment">// if any stage raises errors, stop immediately</span>
<span id="L88" class="LineNr"> 88 </span> <a href='011run.cc.html#L231'>transform</a><span class="Delimiter">(</span>p<span class="Delimiter">);</span>
<span id="L89" class="LineNr"> 89 </span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='003trace.cc.html#L225'>trace_contains_errors</a><span class="Delimiter">())</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
<span id="L90" class="LineNr"> 90 </span> <a href='011run.cc.html#L240'>load</a><span class="Delimiter">(</span>p<span class="Delimiter">);</span>
<span id="L91" class="LineNr"> 91 </span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='003trace.cc.html#L225'>trace_contains_errors</a><span class="Delimiter">())</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
<span id="L92" class="LineNr"> 92 </span> <span class="Normal">while</span> <span class="Delimiter">(</span><a href='010---vm.cc.html#L29'>EIP</a> < <a href='010---vm.cc.html#L163'>End_of_program</a><span class="Delimiter">)</span>
<span id="L93" class="LineNr"> 93 </span> <a href='010---vm.cc.html#L258'>run_one_instruction</a><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="SalientComment">//:: core data structures</span>
<span id="L97" class="LineNr"> 97 </span>
<span id="L98" class="LineNr"> 98 </span><span class="Delimiter">:(before "End Types")</span>
<span id="L99" class="LineNr"> 99 </span><span class="Normal">struct</span> <a href='011run.cc.html#L99'>program</a> <span class="Delimiter">{</span>
<span id="L100" class="LineNr">100 </span> vector<segment> <a href='011run.cc.html#L100'>segments</a><span class="Delimiter">;</span>
<span id="L101" class="LineNr">101 </span> <span class="Comment">// random ideas for other things we may eventually need</span>
<span id="L102" class="LineNr">102 </span> <span class="Comment">//map<name, address> globals;</span>
<span id="L103" class="LineNr">103 </span> <span class="Comment">//vector<recipe> recipes;</span>
<span id="L104" class="LineNr">104 </span> <span class="Comment">//map<string, type_info> types;</span>
<span id="L105" class="LineNr">105 </span><span class="Delimiter">};</span>
<span id="L106" class="LineNr">106 </span><span class="Delimiter">:(before "struct program")</span>
<span id="L107" class="LineNr">107 </span><span class="Normal">struct</span> segment <span class="Delimiter">{</span>
<span id="L108" class="LineNr">108 </span> <span class="Normal">uint32_t</span> start<span class="Delimiter">;</span>
<span id="L109" class="LineNr">109 </span> vector<line> <a href='011run.cc.html#L109'>lines</a><span class="Delimiter">;</span>
<span id="L110" class="LineNr">110 </span> <span class="Comment">// End segment Fields</span>
<span id="L111" class="LineNr">111 </span> segment<span class="Delimiter">()</span> <span class="Delimiter">{</span>
<span id="L112" class="LineNr">112 </span> start = <span class="Constant">0</span><span class="Delimiter">;</span>
<span id="L113" class="LineNr">113 </span> <span class="Comment">// End segment Constructor</span>
<span id="L114" class="LineNr">114 </span> <span class="Delimiter">}</span>
<span id="L115" class="LineNr">115 </span><span class="Delimiter">};</span>
<span id="L116" class="LineNr">116 </span><span class="Delimiter">:(before "struct segment")</span>
<span id="L117" class="LineNr">117 </span><span class="Normal">struct</span> <a href='011run.cc.html#L117'>line</a> <span class="Delimiter">{</span>
<span id="L118" class="LineNr">118 </span> vector<word> <a href='011run.cc.html#L118'>words</a><span class="Delimiter">;</span>
<span id="L119" class="LineNr">119 </span> vector<string> metadata<span class="Delimiter">;</span>
<span id="L120" class="LineNr">120 </span> string original<span class="Delimiter">;</span>
<span id="L121" class="LineNr">121 </span><span class="Delimiter">};</span>
<span id="L122" class="LineNr">122 </span><span class="Delimiter">:(before "struct line")</span>
<span id="L123" class="LineNr">123 </span><span class="Normal">struct</span> <a href='011run.cc.html#L123'>word</a> <span class="Delimiter">{</span>
<span id="L124" class="LineNr">124 </span> string original<span class="Delimiter">;</span>
<span id="L125" class="LineNr">125 </span> string data<span class="Delimiter">;</span>
<span id="L126" class="LineNr">126 </span> vector<string> metadata<span class="Delimiter">;</span>
<span id="L127" class="LineNr">127 </span><span class="Delimiter">};</span>
<span id="L128" class="LineNr">128 </span>
<span id="L129" class="LineNr">129 </span><span class="SalientComment">//:: parse</span>
<span id="L130" class="LineNr">130 </span>
<span id="L131" class="LineNr">131 </span><span class="Delimiter">:(code)</span>
<span id="L132" class="LineNr">132 </span><span class="Normal">void</span> parse<span class="Delimiter">(</span>istream& fin<span class="Delimiter">,</span> program& out<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L133" class="LineNr">133 </span> vector<line> l<span class="Delimiter">;</span>
<span id="L134" class="LineNr">134 </span> <a href='003trace.cc.html#L204'>trace</a><span class="Delimiter">(</span><span class="Constant">99</span><span class="Delimiter">,</span> <span class="Constant">"parse"</span><span class="Delimiter">)</span> << <span class="Constant">"begin"</span> << end<span class="Delimiter">();</span>
<span id="L135" class="LineNr">135 </span> <span class="Normal">while</span> <span class="Delimiter">(</span><a href='001help.cc.html#L260'>has_data</a><span class="Delimiter">(</span>fin<span class="Delimiter">))</span> <span class="Delimiter">{</span>
<span id="L136" class="LineNr">136 </span> string line_data<span class="Delimiter">;</span>
<span id="L137" class="LineNr">137 </span> <a href='011run.cc.html#L117'>line</a> curr<span class="Delimiter">;</span>
<span id="L138" class="LineNr">138 </span> getline<span class="Delimiter">(</span>fin<span class="Delimiter">,</span> line_data<span class="Delimiter">);</span>
<span id="L139" class="LineNr">139 </span> curr<span class="Delimiter">.</span>original = line_data<span class="Delimiter">;</span>
<span id="L140" class="LineNr">140 </span> <a href='003trace.cc.html#L204'>trace</a><span class="Delimiter">(</span><span class="Constant">99</span><span class="Delimiter">,</span> <span class="Constant">"parse"</span><span class="Delimiter">)</span> << <span class="Constant">"line: "</span> << line_data << end<span class="Delimiter">();</span>
<span id="L141" class="LineNr">141 </span> <span class="Comment">// End Line Parsing Special-cases(line_data -> l)</span>
<span id="L142" class="LineNr">142 </span> istringstream lin<span class="Delimiter">(</span>line_data<span class="Delimiter">);</span>
<span id="L143" class="LineNr">143 </span> <span class="Normal">while</span> <span class="Delimiter">(</span><a href='001help.cc.html#L260'>has_data</a><span class="Delimiter">(</span>lin<span class="Delimiter">))</span> <span class="Delimiter">{</span>
<span id="L144" class="LineNr">144 </span> string word_data<span class="Delimiter">;</span>
<span id="L145" class="LineNr">145 </span> lin >> word_data<span class="Delimiter">;</span>
<span id="L146" class="LineNr">146 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>word_data<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
<span id="L147" class="LineNr">147 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>word_data[<span class="Constant">0</span>] == <span class="Constant">'#'</span><span class="Delimiter">)</span> <span class="Identifier">break</span><span class="Delimiter">;</span> <span class="Comment">// comment</span>
<span id="L148" class="LineNr">148 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>word_data == <span class="Constant">"."</span><span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span> <span class="Comment">// comment token</span>
<span id="L149" class="LineNr">149 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>word_data == <span class="Constant">"=="</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L150" class="LineNr">150 </span> <a href='011run.cc.html#L180'>flush</a><span class="Delimiter">(</span>out<span class="Delimiter">,</span> l<span class="Delimiter">);</span>
<span id="L151" class="LineNr">151 </span> string segment_title<span class="Delimiter">;</span>
<span id="L152" class="LineNr">152 </span> lin >> segment_title<span class="Delimiter">;</span>
<span id="L153" class="LineNr">153 </span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L93'>starts_with</a><span class="Delimiter">(</span>segment_title<span class="Delimiter">,</span> <span class="Constant">"0x"</span><span class="Delimiter">))</span> <span class="Delimiter">{</span>
<span id="L154" class="LineNr">154 </span> segment s<span class="Delimiter">;</span>
<span id="L155" class="LineNr">155 </span> s<span class="Delimiter">.</span>start = <a href='011run.cc.html#L362'>parse_int</a><span class="Delimiter">(</span>segment_title<span class="Delimiter">);</span>
<span id="L156" class="LineNr">156 </span> <a href='011run.cc.html#L201'>sanity_check_program_segment</a><span class="Delimiter">(</span>out<span class="Delimiter">,</span> s<span class="Delimiter">.</span>start<span class="Delimiter">);</span>
<span id="L157" class="LineNr">157 </span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='003trace.cc.html#L225'>trace_contains_errors</a><span class="Delimiter">())</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
<span id="L158" class="LineNr">158 </span> <a href='003trace.cc.html#L204'>trace</a><span class="Delimiter">(</span><span class="Constant">99</span><span class="Delimiter">,</span> <span class="Constant">"parse"</span><span class="Delimiter">)</span> << <span class="Constant">"new segment from 0x"</span> << <a href='010---vm.cc.html#L368'>HEXWORD</a> << s<span class="Delimiter">.</span>start << end<span class="Delimiter">();</span>
<span id="L159" class="LineNr">159 </span> out<span class="Delimiter">.</span><a href='011run.cc.html#L100'>segments</a><span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>s<span class="Delimiter">);</span>
<span id="L160" class="LineNr">160 </span> <span class="Delimiter">}</span>
<span id="L161" class="LineNr">161 </span> <span class="Comment">// End Segment Parsing Special-cases(segment_title)</span>
<span id="L162" class="LineNr">162 </span> <span class="Comment">// todo: segment segment metadata</span>
<span id="L163" class="LineNr">163 </span> <span class="Identifier">break</span><span class="Delimiter">;</span> <span class="Comment">// skip rest of line</span>
<span id="L164" class="LineNr">164 </span> <span class="Delimiter">}</span>
<span id="L165" class="LineNr">165 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>word_data[<span class="Constant">0</span>] == <span class="Constant">':'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L166" class="LineNr">166 </span> <span class="Comment">// todo: line metadata</span>
<span id="L167" class="LineNr">167 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L168" class="LineNr">168 </span> <span class="Delimiter">}</span>
<span id="L169" class="LineNr">169 </span> curr<span class="Delimiter">.</span><a href='011run.cc.html#L118'>words</a><span class="Delimiter">.</span>push_back<span class="Delimiter">(</span><a href='011run.cc.html#L123'>word</a><span class="Delimiter">());</span>
<span id="L170" class="LineNr">170 </span> <a href='011run.cc.html#L191'>parse_word</a><span class="Delimiter">(</span>word_data<span class="Delimiter">,</span> curr<span class="Delimiter">.</span><a href='011run.cc.html#L118'>words</a><span class="Delimiter">.</span>back<span class="Delimiter">());</span>
<span id="L171" class="LineNr">171 </span> <a href='003trace.cc.html#L204'>trace</a><span class="Delimiter">(</span><span class="Constant">99</span><span class="Delimiter">,</span> <span class="Constant">"parse"</span><span class="Delimiter">)</span> << <span class="Constant">"word: "</span> << to_string<span class="Delimiter">(</span>curr<span class="Delimiter">.</span><a href='011run.cc.html#L118'>words</a><span class="Delimiter">.</span>back<span class="Delimiter">());</span>
<span id="L172" class="LineNr">172 </span> <span class="Delimiter">}</span>
<span id="L173" class="LineNr">173 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>!curr<span class="Delimiter">.</span><a href='011run.cc.html#L118'>words</a><span class="Delimiter">.</span>empty<span class="Delimiter">())</span>
<span id="L174" class="LineNr">174 </span> l<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>curr<span class="Delimiter">);</span>
<span id="L175" class="LineNr">175 </span> <span class="Delimiter">}</span>
<span id="L176" class="LineNr">176 </span> <a href='011run.cc.html#L180'>flush</a><span class="Delimiter">(</span>out<span class="Delimiter">,</span> l<span class="Delimiter">);</span>
<span id="L177" class="LineNr">177 </span> <a href='003trace.cc.html#L204'>trace</a><span class="Delimiter">(</span><span class="Constant">99</span><span class="Delimiter">,</span> <span class="Constant">"parse"</span><span class="Delimiter">)</span> << <span class="Constant">"done"</span> << end<span class="Delimiter">();</span>
<span id="L178" class="LineNr">178 </span><span class="Delimiter">}</span>
<span id="L179" class="LineNr">179 </span>
<span id="L180" class="LineNr">180 </span><span class="Normal">void</span> <a href='011run.cc.html#L180'>flush</a><span class="Delimiter">(</span>program& p<span class="Delimiter">,</span> vector<line>& <a href='011run.cc.html#L109'>lines</a><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L181" class="LineNr">181 </span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='011run.cc.html#L109'>lines</a><span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
<span id="L182" class="LineNr">182 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>p<span class="Delimiter">.</span><a href='011run.cc.html#L100'>segments</a><span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
<span id="L183" class="LineNr">183 </span> <a href='003trace.cc.html#L211'>raise</a> << <span class="Constant">"input does not start with a '==' section header</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span id="L184" class="LineNr">184 </span> <span class="Identifier">return</span><span class="Delimiter">;</span>
<span id="L185" class="LineNr">185 </span> <span class="Delimiter">}</span>
<span id="L186" class="LineNr">186 </span> <span class="Comment">// End flush(p, lines) Special-cases</span>
<span id="L187" class="LineNr">187 </span> <a href='003trace.cc.html#L204'>trace</a><span class="Delimiter">(</span><span class="Constant">99</span><span class="Delimiter">,</span> <span class="Constant">"parse"</span><span class="Delimiter">)</span> << <span class="Constant">"flushing to segment"</span> << end<span class="Delimiter">();</span>
<span id="L188" class="LineNr">188 </span> p<span class="Delimiter">.</span><a href='011run.cc.html#L100'>segments</a><span class="Delimiter">.</span>back<span class="Delimiter">().</span><a href='011run.cc.html#L109'>lines</a><span class="Delimiter">.</span>swap<span class="Delimiter">(</span><a href='011run.cc.html#L109'>lines</a><span class="Delimiter">);</span>
<span id="L189" class="LineNr">189 </span><span class="Delimiter">}</span>
<span id="L190" class="LineNr">190 </span>
<span id="L191" class="LineNr">191 </span><span class="Normal">void</span> <a href='011run.cc.html#L191'>parse_word</a><span class="Delimiter">(</span><span class="Normal">const</span> string& data<span class="Delimiter">,</span> word& out<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L192" class="LineNr">192 </span> out<span class="Delimiter">.</span>original = data<span class="Delimiter">;</span>
<span id="L193" class="LineNr">193 </span> istringstream win<span class="Delimiter">(</span>data<span class="Delimiter">);</span>
<span id="L194" class="LineNr">194 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>getline<span class="Delimiter">(</span>win<span class="Delimiter">,</span> out<span class="Delimiter">.</span>data<span class="Delimiter">,</span> <span class="Constant">'/'</span><span class="Delimiter">))</span> <span class="Delimiter">{</span>
<span id="L195" class="LineNr">195 </span> string m<span class="Delimiter">;</span>
<span id="L196" class="LineNr">196 </span> <span class="Normal">while</span> <span class="Delimiter">(</span>getline<span class="Delimiter">(</span>win<span class="Delimiter">,</span> m<span class="Delimiter">,</span> <span class="Constant">'/'</span><span class="Delimiter">))</span>
<span id="L197" class="LineNr">197 </span> out<span class="Delimiter">.</span>metadata<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>m<span class="Delimiter">);</span>
<span id="L198" class="LineNr">198 </span> <span class="Delimiter">}</span>
<span id="L199" class="LineNr">199 </span><span class="Delimiter">}</span>
<span id="L200" class="LineNr">200 </span>
<span id="L201" class="LineNr">201 </span><span class="Normal">void</span> <a href='011run.cc.html#L201'>sanity_check_program_segment</a><span class="Delimiter">(</span><span class="Normal">const</span> program& p<span class="Delimiter">,</span> <span class="Normal">uint32_t</span> addr<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L202" class="LineNr">202 </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#L157'>SIZE</a><span class="Delimiter">(</span>p<span class="Delimiter">.</span><a href='011run.cc.html#L100'>segments</a><span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L203" class="LineNr">203 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>p<span class="Delimiter">.</span><a href='011run.cc.html#L100'>segments</a><span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>start == addr<span class="Delimiter">)</span>
<span id="L204" class="LineNr">204 </span> <a href='003trace.cc.html#L211'>raise</a> << <span class="Constant">"can't have multiple segments starting at address 0x"</span> << std::hex << addr << <span class="cSpecial">'\n'</span> << end<span class="Delimiter">();</span>
<span id="L205" class="LineNr">205 </span> <span class="Delimiter">}</span>
<span id="L206" class="LineNr">206 </span><span class="Delimiter">}</span>
<span id="L207" class="LineNr">207 </span>
<span id="L208" class="LineNr">208 </span><span class="Comment">// helper for tests</span>
<span id="L209" class="LineNr">209 </span><span class="Normal">void</span> parse<span class="Delimiter">(</span><span class="Normal">const</span> string& text_bytes<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L210" class="LineNr">210 </span> <a href='011run.cc.html#L99'>program</a> p<span class="Delimiter">;</span>
<span id="L211" class="LineNr">211 </span> istringstream in<span class="Delimiter">(</span>text_bytes<span class="Delimiter">);</span>
<span id="L212" class="LineNr">212 </span> parse<span class="Delimiter">(</span>in<span class="Delimiter">,</span> p<span class="Delimiter">);</span>
<span id="L213" class="LineNr">213 </span><span class="Delimiter">}</span>
<span id="L214" class="LineNr">214 </span>
<span id="L215" class="LineNr">215 </span><span class="Delimiter">:(scenarios parse)</span>
<span id="L216" class="LineNr">216 </span><span class="Delimiter">:(scenario detect_duplicate_segments)</span>
<span id="L217" class="LineNr">217 </span><span class="Special">% Hide_errors = true;</span>
<span id="L218" class="LineNr">218 </span>== <span class="Constant">0xee</span>
<span id="L219" class="LineNr">219 </span>ab
<span id="L220" class="LineNr">220 </span>== <span class="Constant">0xee</span>
<span id="L221" class="LineNr">221 </span>cd
<span id="L222" class="LineNr">222 </span><span class="traceContains">+error: can't have multiple segments starting at address 0xee</span>
<span id="L223" class="LineNr">223 </span>
<span id="L224" class="LineNr">224 </span><span class="SalientComment">//:: transform</span>
<span id="L225" class="LineNr">225 </span>
<span id="L226" class="LineNr">226 </span><span class="Delimiter">:(before "End Types")</span>
<span id="L227" class="LineNr">227 </span><span class="Normal">typedef</span> <span class="Normal">void</span> <span class="Delimiter">(</span>*transform_fn<span class="Delimiter">)(</span>program&<span class="Delimiter">);</span>
<span id="L228" class="LineNr">228 </span><span class="Delimiter">:(before "End Globals")</span>
<span id="L229" class="LineNr">229 </span>vector<transform_fn> <a href='011run.cc.html#L229'>Transform</a><span class="Delimiter">;</span>
<span id="L230" class="LineNr">230 </span>
<span id="L231" class="LineNr">231 </span><span class="Normal">void</span> <a href='011run.cc.html#L231'>transform</a><span class="Delimiter">(</span>program& p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L232" class="LineNr">232 </span> <a href='003trace.cc.html#L204'>trace</a><span class="Delimiter">(</span><span class="Constant">99</span><span class="Delimiter">,</span> <span class="Constant">"transform"</span><span class="Delimiter">)</span> << <span class="Constant">"begin"</span> << end<span class="Delimiter">();</span>
<span id="L233" class="LineNr">233 </span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> t = <span class="Constant">0</span><span class="Delimiter">;</span> t < <a href='001help.cc.html#L157'>SIZE</a><span class="Delimiter">(</span><a href='011run.cc.html#L229'>Transform</a><span class="Delimiter">);</span> ++t<span class="Delimiter">)</span>
<span id="L234" class="LineNr">234 </span> <span class="Delimiter">(</span>*Transform<span class="Delimiter">.</span>at<span class="Delimiter">(</span>t<span class="Delimiter">))(</span>p<span class="Delimiter">);</span>
<span id="L235" class="LineNr">235 </span> <a href='003trace.cc.html#L204'>trace</a><span class="Delimiter">(</span><span class="Constant">99</span><span class="Delimiter">,</span> <span class="Constant">"transform"</span><span class="Delimiter">)</span> << <span class="Constant">"done"</span> << end<span class="Delimiter">();</span>
<span id="L236" class="LineNr">236 </span><span class="Delimiter">}</span>
<span id="L237" class="LineNr">237 </span>
<span id="L238" class="LineNr">238 </span><span class="SalientComment">//:: load</span>
<span id="L239" class="LineNr">239 </span>
<span id="L240" class="LineNr">240 </span><span class="Normal">void</span> <a href='011run.cc.html#L240'>load</a><span class="Delimiter">(</span><span class="Normal">const</span> program& p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L241" class="LineNr">241 </span> <a href='003trace.cc.html#L204'>trace</a><span class="Delimiter">(</span><span class="Constant">99</span><span class="Delimiter">,</span> <span class="Constant">"load"</span><span class="Delimiter">)</span> << <span class="Constant">"begin"</span> << end<span class="Delimiter">();</span>
<span id="L242" class="LineNr">242 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>p<span class="Delimiter">.</span><a href='011run.cc.html#L100'>segments</a><span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
<span id="L243" class="LineNr">243 </span> <a href='003trace.cc.html#L211'>raise</a> << <span class="Constant">"no <a href='031check_operands.cc.html#L14'>code</a> to <a href='011run.cc.html#L83'>run</a></span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span id="L244" class="LineNr">244 </span> <span class="Identifier">return</span><span class="Delimiter">;</span>
<span id="L245" class="LineNr">245 </span> <span class="Delimiter">}</span>
<span id="L246" class="LineNr">246 </span> <span class="Comment">// Ensure segments are disjoint.</span>
<span id="L247" class="LineNr">247 </span> set<<span class="Normal">uint32_t</span>> overlap<span class="Delimiter">;</span>
<span id="L248" class="LineNr">248 </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#L157'>SIZE</a><span class="Delimiter">(</span>p<span class="Delimiter">.</span><a href='011run.cc.html#L100'>segments</a><span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L249" class="LineNr">249 </span> <span class="Normal">const</span> segment& seg = p<span class="Delimiter">.</span><a href='011run.cc.html#L100'>segments</a><span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
<span id="L250" class="LineNr">250 </span> <span class="Normal">uint32_t</span> addr = seg<span class="Delimiter">.</span>start<span class="Delimiter">;</span>
<span id="L251" class="LineNr">251 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>!already_allocated<span class="Delimiter">(</span>addr<span class="Delimiter">))</span>
<span id="L252" class="LineNr">252 </span> <a href='010---vm.cc.html#L149'>Mem</a><span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>vma<span class="Delimiter">(</span>seg<span class="Delimiter">.</span>start<span class="Delimiter">));</span>
<span id="L253" class="LineNr">253 </span> <a href='003trace.cc.html#L204'>trace</a><span class="Delimiter">(</span><span class="Constant">99</span><span class="Delimiter">,</span> <span class="Constant">"load"</span><span class="Delimiter">)</span> << <span class="Constant">"loading segment "</span> << i << <span class="Constant">" from "</span> << <a href='010---vm.cc.html#L368'>HEXWORD</a> << addr << end<span class="Delimiter">();</span>
<span id="L254" class="LineNr">254 </span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> j = <span class="Constant">0</span><span class="Delimiter">;</span> j < <a href='001help.cc.html#L157'>SIZE</a><span class="Delimiter">(</span>seg<span class="Delimiter">.</span><a href='011run.cc.html#L109'>lines</a><span class="Delimiter">);</span> ++j<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L255" class="LineNr">255 </span> <span class="Normal">const</span> line& l = seg<span class="Delimiter">.</span><a href='011run.cc.html#L109'>lines</a><span class="Delimiter">.</span>at<span class="Delimiter">(</span>j<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> k = <span class="Constant">0</span><span class="Delimiter">;</span> k < <a href='001help.cc.html#L157'>SIZE</a><span class="Delimiter">(</span>l<span class="Delimiter">.</span><a href='011run.cc.html#L118'>words</a><span class="Delimiter">);</span> ++k<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L257" class="LineNr">257 </span> <span class="Normal">const</span> word& w = l<span class="Delimiter">.</span><a href='011run.cc.html#L118'>words</a><span class="Delimiter">.</span>at<span class="Delimiter">(</span>k<span class="Delimiter">);</span>
<span id="L258" class="LineNr">258 </span> <span class="Normal">uint8_t</span> val = <a href='011run.cc.html#L273'>hex_byte</a><span class="Delimiter">(</span>w<span class="Delimiter">.</span>data<span class="Delimiter">);</span>
<span id="L259" class="LineNr">259 </span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='003trace.cc.html#L225'>trace_contains_errors</a><span class="Delimiter">())</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
<span id="L260" class="LineNr">260 </span> assert<span class="Delimiter">(</span>overlap<span class="Delimiter">.</span>find<span class="Delimiter">(</span>addr<span class="Delimiter">)</span> == overlap<span class="Delimiter">.</span>end<span class="Delimiter">());</span>
<span id="L261" class="LineNr">261 </span> <a href='010---vm.cc.html#L225'>write_mem_u8</a><span class="Delimiter">(</span>addr<span class="Delimiter">,</span> val<span class="Delimiter">);</span>
<span id="L262" class="LineNr">262 </span> overlap<span class="Delimiter">.</span>insert<span class="Delimiter">(</span>addr<span class="Delimiter">);</span>
<span id="L263" class="LineNr">263 </span> <a href='003trace.cc.html#L204'>trace</a><span class="Delimiter">(</span><span class="Constant">99</span><span class="Delimiter">,</span> <span class="Constant">"load"</span><span class="Delimiter">)</span> << <span class="Constant">"0x"</span> << <a href='010---vm.cc.html#L368'>HEXWORD</a> << addr << <span class="Constant">" -> "</span> << <a href='010---vm.cc.html#L367'>HEXBYTE</a> << <a href='010---vm.cc.html#L370'>NUM</a><span class="Delimiter">(</span><a href='010---vm.cc.html#L171'>read_mem_u8</a><span class="Delimiter">(</span>addr<span class="Delimiter">))</span> << end<span class="Delimiter">();</span>
<span id="L264" class="LineNr">264 </span> ++addr<span class="Delimiter">;</span>
<span id="L265" class="LineNr">265 </span> <span class="Delimiter">}</span>
<span id="L266" class="LineNr">266 </span> <span class="Delimiter">}</span>
<span id="L267" class="LineNr">267 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>i == <span class="Constant">0</span><span class="Delimiter">)</span> <a href='010---vm.cc.html#L163'>End_of_program</a> = addr<span class="Delimiter">;</span>
<span id="L268" class="LineNr">268 </span> <span class="Delimiter">}</span>
<span id="L269" class="LineNr">269 </span> <a href='010---vm.cc.html#L29'>EIP</a> = p<span class="Delimiter">.</span><a href='011run.cc.html#L100'>segments</a><span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>start<span class="Delimiter">;</span>
<span id="L270" class="LineNr">270 </span> <a href='003trace.cc.html#L204'>trace</a><span class="Delimiter">(</span><span class="Constant">99</span><span class="Delimiter">,</span> <span class="Constant">"load"</span><span class="Delimiter">)</span> << <span class="Constant">"done"</span> << end<span class="Delimiter">();</span>
<span id="L271" class="LineNr">271 </span><span class="Delimiter">}</span>
<span id="L272" class="LineNr">272 </span>
<span id="L273" class="LineNr">273 </span><span class="Normal">uint8_t</span> <a href='011run.cc.html#L273'>hex_byte</a><span class="Delimiter">(</span><span class="Normal">const</span> string& s<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L274" class="LineNr">274 </span> istringstream in<span class="Delimiter">(</span>s<span class="Delimiter">);</span>
<span id="L275" class="LineNr">275 </span> <span class="Normal">int</span> result = <span class="Constant">0</span><span class="Delimiter">;</span>
<span id="L276" class="LineNr">276 </span> in >> std::hex >> result<span class="Delimiter">;</span>
<span id="L277" class="LineNr">277 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>!in || !in<span class="Delimiter">.</span>eof<span class="Delimiter">())</span> <span class="Delimiter">{</span>
<span id="L278" class="LineNr">278 </span> <a href='003trace.cc.html#L211'>raise</a> << <span class="Constant">"token '"</span> << s << <span class="Constant">"' is not a hex byte</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span id="L279" class="LineNr">279 </span> <span class="Identifier">return</span> <span class="cSpecial">'\0'</span><span class="Delimiter">;</span>
<span id="L280" class="LineNr">280 </span> <span class="Delimiter">}</span>
<span id="L281" class="LineNr">281 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>result > <span class="Constant">0xff</span> || result < -<span class="Constant">0x8f</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L282" class="LineNr">282 </span> <a href='003trace.cc.html#L211'>raise</a> << <span class="Constant">"token '"</span> << s << <span class="Constant">"' is not a hex byte</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span id="L283" class="LineNr">283 </span> <span class="Identifier">return</span> <span class="cSpecial">'\0'</span><span class="Delimiter">;</span>
<span id="L284" class="LineNr">284 </span> <span class="Delimiter">}</span>
<span id="L285" class="LineNr">285 </span> <span class="Identifier">return</span> <span class="Normal">static_cast</span><<span class="Normal">uint8_t</span>><span class="Delimiter">(</span>result<span class="Delimiter">);</span>
<span id="L286" class="LineNr">286 </span><span class="Delimiter">}</span>
<span id="L287" class="LineNr">287 </span>
<span id="L288" class="LineNr">288 </span><span class="Delimiter">:(scenarios parse_and_load)</span>
<span id="L289" class="LineNr">289 </span><span class="Delimiter">:(scenario number_too_large)</span>
<span id="L290" class="LineNr">290 </span><span class="Special">% Hide_errors = true;</span>
<span id="L291" class="LineNr">291 </span>== <span class="Constant">0x1</span>
<span id="L292" class="LineNr">292 </span><span class="PreProc">0</span><span class="Constant">5</span> cab
<span id="L293" class="LineNr">293 </span><span class="traceContains">+error: token 'cab' is not a hex byte</span>
<span id="L294" class="LineNr">294 </span>
<span id="L295" class="LineNr">295 </span><span class="Delimiter">:(scenario invalid_hex)</span>
<span id="L296" class="LineNr">296 </span><span class="Special">% Hide_errors = true;</span>
<span id="L297" class="LineNr">297 </span>== <span class="Constant">0x1</span>
<span id="L298" class="LineNr">298 </span><span class="PreProc">0</span><span class="Constant">5</span> cx
<span id="L299" class="LineNr">299 </span><span class="traceContains">+error: token 'cx' is not a hex byte</span>
<span id="L300" class="LineNr">300 </span>
<span id="L301" class="LineNr">301 </span><span class="Delimiter">:(scenario negative_number)</span>
<span id="L302" class="LineNr">302 </span>== <span class="Constant">0x1</span>
<span id="L303" class="LineNr">303 </span><span class="PreProc">0</span><span class="Constant">5</span> -<span class="Constant">12</span>
<span id="L304" class="LineNr">304 </span>$error: <span class="Constant">0</span>
<span id="L305" class="LineNr">305 </span>
<span id="L306" class="LineNr">306 </span><span class="Delimiter">:(scenario negative_number_too_small)</span>
<span id="L307" class="LineNr">307 </span><span class="Special">% Hide_errors = true;</span>
<span id="L308" class="LineNr">308 </span>== <span class="Constant">0x1</span>
<span id="L309" class="LineNr">309 </span><span class="PreProc">0</span><span class="Constant">5</span> -<span class="Constant">12345</span>
<span id="L310" class="LineNr">310 </span><span class="traceContains">+error: token '-12345' is not a hex byte</span>
<span id="L311" class="LineNr">311 </span>
<span id="L312" class="LineNr">312 </span><span class="Delimiter">:(scenario hex_prefix)</span>
<span id="L313" class="LineNr">313 </span>== <span class="Constant">0x1</span>
<span id="L314" class="LineNr">314 </span><span class="Constant">0x05</span> -<span class="Constant">0x12</span>
<span id="L315" class="LineNr">315 </span>$error: <span class="Constant">0</span>
<span id="L316" class="LineNr">316 </span>
<span id="L317" class="LineNr">317 </span><span class="Comment">//: helper for tests</span>
<span id="L318" class="LineNr">318 </span><span class="Delimiter">:(code)</span>
<span id="L319" class="LineNr">319 </span><span class="Normal">void</span> <a href='011run.cc.html#L319'>parse_and_load</a><span class="Delimiter">(</span><span class="Normal">const</span> string& text_bytes<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L320" class="LineNr">320 </span> <a href='011run.cc.html#L99'>program</a> p<span class="Delimiter">;</span>
<span id="L321" class="LineNr">321 </span> istringstream in<span class="Delimiter">(</span>text_bytes<span class="Delimiter">);</span>
<span id="L322" class="LineNr">322 </span> parse<span class="Delimiter">(</span>in<span class="Delimiter">,</span> p<span class="Delimiter">);</span>
<span id="L323" class="LineNr">323 </span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='003trace.cc.html#L225'>trace_contains_errors</a><span class="Delimiter">())</span> <span class="Identifier">return</span><span class="Delimiter">;</span> <span class="Comment">// if any stage raises errors, stop immediately</span>
<span id="L324" class="LineNr">324 </span> <a href='011run.cc.html#L240'>load</a><span class="Delimiter">(</span>p<span class="Delimiter">);</span>
<span id="L325" class="LineNr">325 </span><span class="Delimiter">}</span>
<span id="L326" class="LineNr">326 </span>
<span id="L327" class="LineNr">327 </span><span class="SalientComment">//:: run</span>
<span id="L328" class="LineNr">328 </span>
<span id="L329" class="LineNr">329 </span><span class="Delimiter">:(before "End Initialize Op Names(name)")</span>
<span id="L330" class="LineNr">330 </span><a href='001help.cc.html#L243'>put</a><span class="Delimiter">(</span><a href='010---vm.cc.html#L336'>name</a><span class="Delimiter">,</span> <span class="Constant">"05"</span><span class="Delimiter">,</span> <span class="Constant">"add imm32 to R0 (EAX)"</span><span class="Delimiter">);</span>
<span id="L331" class="LineNr">331 </span>
<span id="L332" class="LineNr">332 </span><span class="Comment">//: our first opcode</span>
<span id="L333" class="LineNr">333 </span><span class="Delimiter">:(before "End Single-Byte Opcodes")</span>
<span id="L334" class="LineNr">334 </span><span class="Normal">case</span> <span class="Constant">0x05</span>: <span class="Delimiter">{</span> <span class="Comment">// add imm32 to EAX</span>
<span id="L335" class="LineNr">335 </span> <span class="Normal">int32_t</span> arg2 = <a href='011run.cc.html#L343'>next32</a><span class="Delimiter">();</span>
<span id="L336" class="LineNr">336 </span> <a href='003trace.cc.html#L204'>trace</a><span class="Delimiter">(</span><span class="Constant">90</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"add imm32 0x"</span> << <a href='010---vm.cc.html#L368'>HEXWORD</a> << arg2 << <span class="Constant">" to <a href='010---vm.cc.html#L23'>reg</a> EAX"</span> << end<span class="Delimiter">();</span>
<span id="L337" class="LineNr">337 </span> <a href='010---vm.cc.html#L69'>BINARY_ARITHMETIC_OP</a><span class="Delimiter">(</span>+<span class="Delimiter">,</span> Reg[EAX]<span class="Delimiter">.</span>i<span class="Delimiter">,</span> arg2<span class="Delimiter">);</span>
<span id="L338" class="LineNr">338 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L339" class="LineNr">339 </span><span class="Delimiter">}</span>
<span id="L340" class="LineNr">340 </span>
<span id="L341" class="LineNr">341 </span><span class="Delimiter">:(code)</span>
<span id="L342" class="LineNr">342 </span><span class="Comment">// read a 32-bit int in little-endian order from the instruction stream</span>
<span id="L343" class="LineNr">343 </span><span class="Normal">int32_t</span> <a href='011run.cc.html#L343'>next32</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
<span id="L344" class="LineNr">344 </span> <span class="Normal">int32_t</span> result = <a href='010---vm.cc.html#L322'>next</a><span class="Delimiter">();</span>
<span id="L345" class="LineNr">345 </span> result |= <span class="Delimiter">(</span><a href='010---vm.cc.html#L322'>next</a><span class="Delimiter">()</span><<<span class="Constant">8</span><span class="Delimiter">);</span>
<span id="L346" class="LineNr">346 </span> result |= <span class="Delimiter">(</span><a href='010---vm.cc.html#L322'>next</a><span class="Delimiter">()</span><<<span class="Constant">16</span><span class="Delimiter">);</span>
<span id="L347" class="LineNr">347 </span> result |= <span class="Delimiter">(</span><a href='010---vm.cc.html#L322'>next</a><span class="Delimiter">()</span><<<span class="Constant">24</span><span class="Delimiter">);</span>
<span id="L348" class="LineNr">348 </span> <span class="Identifier">return</span> result<span class="Delimiter">;</span>
<span id="L349" class="LineNr">349 </span><span class="Delimiter">}</span>
<span id="L350" class="LineNr">350 </span>
<span id="L351" class="LineNr">351 </span><span class="SalientComment">//:: helpers</span>
<span id="L352" class="LineNr">352 </span>
<span id="L353" class="LineNr">353 </span><span class="Delimiter">:(code)</span>
<span id="L354" class="LineNr">354 </span>string to_string<span class="Delimiter">(</span><span class="Normal">const</span> word& w<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L355" class="LineNr">355 </span> ostringstream out<span class="Delimiter">;</span>
<span id="L356" class="LineNr">356 </span> out << w<span class="Delimiter">.</span>data<span class="Delimiter">;</span>
<span id="L357" class="LineNr">357 </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#L157'>SIZE</a><span class="Delimiter">(</span>w<span class="Delimiter">.</span>metadata<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span>
<span id="L358" class="LineNr">358 </span> out << <span class="Constant">" /"</span> << w<span class="Delimiter">.</span>metadata<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
<span id="L359" class="LineNr">359 </span> <span class="Identifier">return</span> out<span class="Delimiter">.</span>str<span class="Delimiter">();</span>
<span id="L360" class="LineNr">360 </span><span class="Delimiter">}</span>
<span id="L361" class="LineNr">361 </span>
<span id="L362" class="LineNr">362 </span><span class="Normal">int32_t</span> <a href='011run.cc.html#L362'>parse_int</a><span class="Delimiter">(</span><span class="Normal">const</span> string& s<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L363" class="LineNr">363 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>s<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">return</span> <span class="Constant">0</span><span class="Delimiter">;</span>
<span id="L364" class="LineNr">364 </span> istringstream in<span class="Delimiter">(</span>s<span class="Delimiter">);</span>
<span id="L365" class="LineNr">365 </span> in >> std::hex<span class="Delimiter">;</span>
<span id="L366" class="LineNr">366 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>s<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span> == <span class="Constant">'-'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L367" class="LineNr">367 </span> <span class="Normal">int32_t</span> result = <span class="Constant">0</span><span class="Delimiter">;</span>
<span id="L368" class="LineNr">368 </span> in >> result<span class="Delimiter">;</span>
<span id="L369" class="LineNr">369 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>!in || !in<span class="Delimiter">.</span>eof<span class="Delimiter">())</span> <span class="Delimiter">{</span>
<span id="L370" class="LineNr">370 </span> <a href='003trace.cc.html#L211'>raise</a> << <span class="Constant">"not a number: "</span> << s << <span class="cSpecial">'\n'</span> << end<span class="Delimiter">();</span>
<span id="L371" class="LineNr">371 </span> <span class="Identifier">return</span> <span class="Constant">0</span><span class="Delimiter">;</span>
<span id="L372" class="LineNr">372 </span> <span class="Delimiter">}</span>
<span id="L373" class="LineNr">373 </span> <span class="Identifier">return</span> result<span class="Delimiter">;</span>
<span id="L374" class="LineNr">374 </span> <span class="Delimiter">}</span>
<span id="L375" class="LineNr">375 </span> <span class="Normal">uint32_t</span> uresult = <span class="Constant">0</span><span class="Delimiter">;</span>
<span id="L376" class="LineNr">376 </span> in >> uresult<span class="Delimiter">;</span>
<span id="L377" class="LineNr">377 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>!in || !in<span class="Delimiter">.</span>eof<span class="Delimiter">())</span> <span class="Delimiter">{</span>
<span id="L378" class="LineNr">378 </span> <a href='003trace.cc.html#L211'>raise</a> << <span class="Constant">"not a number: "</span> << s << <span class="cSpecial">'\n'</span> << end<span class="Delimiter">();</span>
<span id="L379" class="LineNr">379 </span> <span class="Identifier">return</span> <span class="Constant">0</span><span class="Delimiter">;</span>
<span id="L380" class="LineNr">380 </span> <span class="Delimiter">}</span>
<span id="L381" class="LineNr">381 </span> <span class="Identifier">return</span> <span class="Normal">static_cast</span><<span class="Normal">int32_t</span>><span class="Delimiter">(</span>uresult<span class="Delimiter">);</span>
<span id="L382" class="LineNr">382 </span><span class="Delimiter">}</span>
<span id="L383" class="LineNr">383 </span><span class="Delimiter">:(before "End Unit Tests")</span>
<span id="L384" class="LineNr">384 </span><span class="Normal">void</span> <a href='011run.cc.html#L384'>test_parse_int</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
<span id="L385" class="LineNr">385 </span> <a href='002test.cc.html#L31'>CHECK_EQ</a><span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">,</span> <a href='011run.cc.html#L362'>parse_int</a><span class="Delimiter">(</span><span class="Constant">"0"</span><span class="Delimiter">));</span>
<span id="L386" class="LineNr">386 </span> <a href='002test.cc.html#L31'>CHECK_EQ</a><span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">,</span> <a href='011run.cc.html#L362'>parse_int</a><span class="Delimiter">(</span><span class="Constant">"0x0"</span><span class="Delimiter">));</span>
<span id="L387" class="LineNr">387 </span> <a href='002test.cc.html#L31'>CHECK_EQ</a><span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">,</span> <a href='011run.cc.html#L362'>parse_int</a><span class="Delimiter">(</span><span class="Constant">"0x0"</span><span class="Delimiter">));</span>
<span id="L388" class="LineNr">388 </span> <a href='002test.cc.html#L31'>CHECK_EQ</a><span class="Delimiter">(</span><span class="Constant">16</span><span class="Delimiter">,</span> <a href='011run.cc.html#L362'>parse_int</a><span class="Delimiter">(</span><span class="Constant">"10"</span><span class="Delimiter">));</span> <span class="Comment">// hex always</span>
<span id="L389" class="LineNr">389 </span> <a href='002test.cc.html#L31'>CHECK_EQ</a><span class="Delimiter">(</span>-<span class="Constant">1</span><span class="Delimiter">,</span> <a href='011run.cc.html#L362'>parse_int</a><span class="Delimiter">(</span><span class="Constant">"-1"</span><span class="Delimiter">));</span>
<span id="L390" class="LineNr">390 </span> <a href='002test.cc.html#L31'>CHECK_EQ</a><span class="Delimiter">(</span>-<span class="Constant">1</span><span class="Delimiter">,</span> <a href='011run.cc.html#L362'>parse_int</a><span class="Delimiter">(</span><span class="Constant">"0xffffffff"</span><span class="Delimiter">));</span>
<span id="L391" class="LineNr">391 </span><span class="Delimiter">}</span>
</pre>
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