about summary refs log tree commit diff stats
path: root/html/subx/generated by cgit-pink 1.4.1-2-gfad0 (git 2.36.2.497.gbbea4dcf42) at 2024-06-28 02:55:50 +0000
> 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<title>Mu - subx/035labels.cc</title>
<meta name="Generator" content="Vim/8.0">
<meta name="plugin-version" content="vim7.4_v2">
<meta name="syntax" content="cpp">
<meta name="settings" content="number_lines,use_css,pre_wrap,no_foldcolumn,expand_tabs,line_ids,prevent_copy=">
<meta name="colorscheme" content="minimal-light">
<style type="text/css">
<!--
pre { white-space: pre-wrap; font-family: monospace; color: #000000; background-color: #c6c6c6; }
body { font-size:12pt; font-family: monospace; color: #000000; background-color: #c6c6c6; }
a { color:inherit; }
* { font-size:12pt; font-size: 1em; }
.traceAbsent { color: #c00000; }
.traceContains { color: #005f00; }
.LineNr { }
.Constant { color: #008787; }
.Delimiter { color: #c000c0; }
.Special { color: #d70000; }
.Identifier { color: #af5f00; }
.Normal { color: #000000; background-color: #c6c6c6; padding-bottom: 1px; }
.Comment { color: #005faf; }
.cSpecial { color: #008000; }
.PreProc { color: #c000c0; }
-->
</style>

<script type='text/javascript'>
<!--

/* function to open any folds containing a jumped-to line before jumping to it */
function JumpToLine()
{
  var lineNum;
  lineNum = window.location.hash;
  lineNum = lineNum.substr(1); /* strip off '#' */

  if (lineNum.indexOf('L') == -1) {
    lineNum = 'L'+lineNum;
  }
  lineElem = document.getElementById(lineNum);
  /* Always jump to new location even if the line was hidden inside a fold, or
   * we corrected the raw number to a line ID.
   */
  if (lineElem) {
    lineElem.scrollIntoView(true);
  }
  return true;
}
if ('onhashchange' in window) {
  window.onhashchange = JumpToLine;
}

-->
</script>
</head>
<body onload='JumpToLine();'>
<a href='https://github.com/akkartik/mu/blob/master/subx/035labels.cc'>https://github.com/akkartik/mu/blob/master/subx/035labels.cc</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr">  1 </span><span class="Comment">//: Labels are defined by ending names with a ':'. This layer will compute</span>
<span id="L2" class="LineNr">  2 </span><span class="Comment">//: displacements for labels, and compute the offset for instructions using them.</span>
<span id="L3" class="LineNr">  3 </span><span class="Comment">//:</span>
<span id="L4" class="LineNr">  4 </span><span class="Comment">//: We won't check this, but our convention will be that jump targets will</span>
<span id="L5" class="LineNr">  5 </span><span class="Comment">//: start with a '$', while functions will not. Function names will never be</span>
<span id="L6" class="LineNr">  6 </span><span class="Comment">//: jumped to, and jump targets will never be called.</span>
<span id="L7" class="LineNr">  7 </span>
<span id="L8" class="LineNr">  8 </span><span class="Comment">//: We're introducing non-number names for the first time, so it's worth</span>
<span id="L9" class="LineNr">  9 </span><span class="Comment">//: laying down some ground rules all transforms will follow, so things don't</span>
<span id="L10" class="LineNr"> 10 </span><span class="Comment">//: get too confusing:</span>
<span id="L11" class="LineNr"> 11 </span><span class="Comment">//:   - if it starts with a digit, it's treated as a number. If it can't be</span>
<span id="L12" class="LineNr"> 12 </span><span class="Comment">//:     parsed as hex it will raise an error.</span>
<span id="L13" class="LineNr"> 13 </span><span class="Comment">//:   - if it starts with '-' it's treated as a number.</span>
<span id="L14" class="LineNr"> 14 </span><span class="Comment">//:   - if it starts with '0x' it's treated as a number.</span>
<span id="L15" class="LineNr"> 15 </span><span class="Comment">//:   - if it's two characters long, it can't be a name. Either it's a hex</span>
<span id="L16" class="LineNr"> 16 </span><span class="Comment">//:     byte, or it raises an error.</span>
<span id="L17" class="LineNr"> 17 </span><span class="Comment">//: That's it. Names can start with any non-digit that isn't a dash. They can</span>
<span id="L18" class="LineNr"> 18 </span><span class="Comment">//: be a single character long. 'a' is not a hex number, it's a variable.</span>
<span id="L19" class="LineNr"> 19 </span><span class="Comment">//: Later layers may add more conventions partitioning the space of names. But</span>
<span id="L20" class="LineNr"> 20 </span><span class="Comment">//: the above rules will remain inviolate.</span>
<span id="L21" class="LineNr"> 21 </span>
<span id="L22" class="LineNr"> 22 </span><span class="Comment">//: One special label: the address to start running the program at.</span>
<span id="L23" class="LineNr"> 23 </span>
<span id="L24" class="LineNr"> 24 </span><span class="Delimiter">:(scenario entry_label)</span>
<span id="L25" class="LineNr"> 25 </span>== <span class="Constant">0x1</span>
<span id="L26" class="LineNr"> 26 </span><span class="PreProc">0</span><span class="Constant">5</span> <span class="Constant">0x0d0c0b0a</span>/imm32
<span id="L27" class="LineNr"> 27 </span><span class="Special">Entry</span>:
<span id="L28" class="LineNr"> 28 </span><span class="PreProc">0</span><span class="Constant">5</span> <span class="Constant">0x0d0c0b0a</span>/imm32
<span id="L29" class="LineNr"> 29 </span><span class="traceContains">+run: inst: 0x00000006</span>
<span id="L30" class="LineNr"> 30 </span><span class="traceAbsent">-run: inst: 0x00000001</span>
<span id="L31" class="LineNr"> 31 </span>
<span id="L32" class="LineNr"> 32 </span><span class="Delimiter">:(before &quot;End Globals&quot;)</span>
<span id="L33" class="LineNr"> 33 </span><span class="Normal">uint32_t</span> <span class="Special">Entry_address</span> = <span class="Constant">0</span><span class="Delimiter">;</span>
<span id="L34" class="LineNr"> 34 </span><span class="Delimiter">:(before &quot;End Reset&quot;)</span>
<span id="L35" class="LineNr"> 35 </span><span class="Special">Entry_address</span> = <span class="Constant">0</span><span class="Delimiter">;</span>
<span id="L36" class="LineNr"> 36 </span><span class="Delimiter">:(before &quot;End Initialize EIP&quot;)</span>
<span id="L37" class="LineNr"> 37 </span><span class="Normal">if</span> <span class="Delimiter">(</span><span class="Special">Entry_address</span><span class="Delimiter">)</span> EIP = <span class="Special">Entry_address</span><span class="Delimiter">;</span>
<span id="L38" class="LineNr"> 38 </span><span class="Delimiter">:(after &quot;Override e_entry&quot;)</span>
<span id="L39" class="LineNr"> 39 </span><span class="Normal">if</span> <span class="Delimiter">(</span><span class="Special">Entry_address</span><span class="Delimiter">)</span> <a href='035labels.cc.html#L39'>e_entry</a> = <span class="Special">Entry_address</span><span class="Delimiter">;</span>
<span id="L40" class="LineNr"> 40 </span>
<span id="L41" class="LineNr"> 41 </span><span class="Delimiter">:(before &quot;End looks_like_hex_int(s) Detectors&quot;)</span>
<span id="L42" class="LineNr"> 42 </span><span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L166'>SIZE</a><span class="Delimiter">(</span>s<span class="Delimiter">)</span> == <span class="Constant">2</span><span class="Delimiter">)</span> <span class="Identifier">return</span><span class="Constant"> true</span><span class="Delimiter">;</span>
<span id="L43" class="LineNr"> 43 </span>
<span id="L44" class="LineNr"> 44 </span><span class="Delimiter">:(scenarios transform)</span>
<span id="L45" class="LineNr"> 45 </span><span class="Delimiter">:(scenario pack_immediate_ignores_single_byte_nondigit_operand)</span>
<span id="L46" class="LineNr"> 46 </span><span class="Special">% Hide_errors = true;</span>
<span id="L47" class="LineNr"> 47 </span>== <span class="Constant">0x1</span>
<span id="L48" class="LineNr"> 48 </span>b9/copy  a/imm32
<span id="L49" class="LineNr"> 49 </span><span class="traceContains">+transform: packing instruction 'b9/copy a/imm32'</span>
<span id="L50" class="LineNr"> 50 </span><span class="Comment"># no change (we're just not printing metadata to the trace)</span>
<span id="L51" class="LineNr"> 51 </span><span class="traceContains">+transform: instruction after packing: 'b9 a'</span>
<span id="L52" class="LineNr"> 52 </span>
<span id="L53" class="LineNr"> 53 </span><span class="Delimiter">:(scenario pack_immediate_ignores_3_hex_digit_operand)</span>
<span id="L54" class="LineNr"> 54 </span><span class="Special">% Hide_errors = true;</span>
<span id="L55" class="LineNr"> 55 </span>== <span class="Constant">0x1</span>
<span id="L56" class="LineNr"> 56 </span>b9/copy  aaa/imm32
<span id="L57" class="LineNr"> 57 </span><span class="traceContains">+transform: packing instruction 'b9/copy aaa/imm32'</span>
<span id="L58" class="LineNr"> 58 </span><span class="Comment"># no change (we're just not printing metadata to the trace)</span>
<span id="L59" class="LineNr"> 59 </span><span class="traceContains">+transform: instruction after packing: 'b9 aaa'</span>
<span id="L60" class="LineNr"> 60 </span>
<span id="L61" class="LineNr"> 61 </span><span class="Delimiter">:(scenario pack_immediate_ignores_non_hex_operand)</span>
<span id="L62" class="LineNr"> 62 </span><span class="Special">% Hide_errors = true;</span>
<span id="L63" class="LineNr"> 63 </span>== <span class="Constant">0x1</span>
<span id="L64" class="LineNr"> 64 </span>b9/copy xxx/imm32
<span id="L65" class="LineNr"> 65 </span><span class="traceContains">+transform: packing instruction 'b9/copy xxx/imm32'</span>
<span id="L66" class="LineNr"> 66 </span><span class="Comment"># no change (we're just not printing metadata to the trace)</span>
<span id="L67" class="LineNr"> 67 </span><span class="traceContains">+transform: instruction after packing: 'b9 xxx'</span>
<span id="L68" class="LineNr"> 68 </span>
<span id="L69" class="LineNr"> 69 </span><span class="Comment">//: a helper we'll find handy later</span>
<span id="L70" class="LineNr"> 70 </span><span class="Delimiter">:(code)</span>
<span id="L71" class="LineNr"> 71 </span><span class="Normal">void</span> <a href='035labels.cc.html#L71'>check_valid_name</a><span class="Delimiter">(</span><span class="Normal">const</span> string&amp; s<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L72" class="LineNr"> 72 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>s<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
<span id="L73" class="LineNr"> 73 </span>    <a href='003trace.cc.html#L190'>raise</a> &lt;&lt; <span class="Constant">&quot;empty name!\n&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
<span id="L74" class="LineNr"> 74 </span>    <span class="Identifier">return</span><span class="Delimiter">;</span>
<span id="L75" class="LineNr"> 75 </span>  <span class="Delimiter">}</span>
<span id="L76" class="LineNr"> 76 </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 id="L77" class="LineNr"> 77 </span>    <a href='003trace.cc.html#L190'>raise</a> &lt;&lt; <span class="Constant">&quot;'&quot;</span> &lt;&lt; s &lt;&lt; <span class="Constant">&quot;' starts with '-', which can be confused with a negative number; use a different name\n&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
<span id="L78" class="LineNr"> 78 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>s<span class="Delimiter">.</span>substr<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">,</span> <span class="Constant">2</span><span class="Delimiter">)</span> == <span class="Constant">&quot;0x&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L79" class="LineNr"> 79 </span>    <a href='003trace.cc.html#L190'>raise</a> &lt;&lt; <span class="Constant">&quot;'&quot;</span> &lt;&lt; s &lt;&lt; <span class="Constant">&quot;' looks like a hex number; use a different name\n&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
<span id="L80" class="LineNr"> 80 </span>    <span class="Identifier">return</span><span class="Delimiter">;</span>
<span id="L81" class="LineNr"> 81 </span>  <span class="Delimiter">}</span>
<span id="L82" class="LineNr"> 82 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>isdigit<span class="Delimiter">(</span>s<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span>
<span id="L83" class="LineNr"> 83 </span>    <a href='003trace.cc.html#L190'>raise</a> &lt;&lt; <span class="Constant">&quot;'&quot;</span> &lt;&lt; s &lt;&lt; <span class="Constant">&quot;' starts with a digit, and so can be confused with a negative number; use a different name.\n&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
<span id="L84" class="LineNr"> 84 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L166'>SIZE</a><span class="Delimiter">(</span>s<span class="Delimiter">)</span> == <span class="Constant">2</span><span class="Delimiter">)</span>
<span id="L85" class="LineNr"> 85 </span>    <a href='003trace.cc.html#L190'>raise</a> &lt;&lt; <span class="Constant">&quot;'&quot;</span> &lt;&lt; s &lt;&lt; <span class="Constant">&quot;' is two characters long which can look like raw hex bytes at a glance; use a different name\n&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
<span id="L86" class="LineNr"> 86 </span><span class="Delimiter">}</span>
<span id="L87" class="LineNr"> 87 </span>
<span id="L88" class="LineNr"> 88 </span><span class="Comment">//: Now that that's done, let's start using names as labels.</span>
<span id="L89" class="LineNr"> 89 </span>
<span id="L90" class="LineNr"> 90 </span><span class="Delimiter">:(scenario map_label)</span>
<span id="L91" class="LineNr"> 91 </span>== <span class="Constant">0x1</span>
<span id="L92" class="LineNr"> 92 </span><span class="Normal">loop</span>:
<span id="L93" class="LineNr"> 93 </span>  <span class="PreProc">0</span><span class="Constant">5</span>  <span class="Constant">0x0d0c0b0a</span>/imm32
<span id="L94" class="LineNr"> 94 </span><span class="traceContains">+transform: label 'loop' is at address 1</span>
<span id="L95" class="LineNr"> 95 </span>
<span id="L96" class="LineNr"> 96 </span><span class="Delimiter">:(before &quot;End Level-2 Transforms&quot;)</span>
<span id="L97" class="LineNr"> 97 </span><span class="Special"><a href='011run.cc.html#L225'>Transform</a></span><span class="Delimiter">.</span>push_back<span class="Delimiter">(</span><a href='035labels.cc.html#L99'>rewrite_labels</a><span class="Delimiter">);</span>
<span id="L98" class="LineNr"> 98 </span><span class="Delimiter">:(code)</span>
<span id="L99" class="LineNr"> 99 </span><span class="Normal">void</span> <a href='035labels.cc.html#L99'>rewrite_labels</a><span class="Delimiter">(</span>program&amp; p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L100" class="LineNr">100 </span>  <a href='003trace.cc.html#L183'>trace</a><span class="Delimiter">(</span><span class="Constant">99</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;-- rewrite labels&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
<span id="L101" class="LineNr">101 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>p<span class="Delimiter">.</span><a href='011run.cc.html#L96'>segments</a><span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
<span id="L102" class="LineNr">102 </span>  segment&amp; <a href='031check_operands.cc.html#L11'>code</a> = p<span class="Delimiter">.</span><a href='011run.cc.html#L96'>segments</a><span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
<span id="L103" class="LineNr">103 </span>  map&lt;string<span class="Delimiter">,</span> <span class="Normal">int32_t</span>&gt; byte_index<span class="Delimiter">;</span>  <span class="Comment">// values are unsigned, but we're going to do subtractions on them so they need to fit in 31 bits</span>
<span id="L104" class="LineNr">104 </span>  <a href='035labels.cc.html#L113'>compute_byte_indices_for_labels</a><span class="Delimiter">(</span><a href='031check_operands.cc.html#L11'>code</a><span class="Delimiter">,</span> byte_index<span class="Delimiter">);</span>
<span id="L105" class="LineNr">105 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='003trace.cc.html#L204'>trace_contains_errors</a><span class="Delimiter">())</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
<span id="L106" class="LineNr">106 </span>  <a href='035labels.cc.html#L178'>drop_labels</a><span class="Delimiter">(</span><a href='031check_operands.cc.html#L11'>code</a><span class="Delimiter">);</span>
<span id="L107" class="LineNr">107 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='003trace.cc.html#L204'>trace_contains_errors</a><span class="Delimiter">())</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
<span id="L108" class="LineNr">108 </span>  <a href='035labels.cc.html#L190'>replace_labels_with_displacements</a><span class="Delimiter">(</span><a href='031check_operands.cc.html#L11'>code</a><span class="Delimiter">,</span> byte_index<span class="Delimiter">);</span>
<span id="L109" class="LineNr">109 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L256'>contains_key</a><span class="Delimiter">(</span>byte_index<span class="Delimiter">,</span> <span class="Constant">&quot;Entry&quot;</span><span class="Delimiter">))</span>
<span id="L110" class="LineNr">110 </span>    <span class="Special">Entry_address</span> = <a href='031check_operands.cc.html#L11'>code</a><span class="Delimiter">.</span>start + get<span class="Delimiter">(</span>byte_index<span class="Delimiter">,</span> <span class="Constant">&quot;Entry&quot;</span><span class="Delimiter">);</span>
<span id="L111" class="LineNr">111 </span><span class="Delimiter">}</span>
<span id="L112" class="LineNr">112 </span>
<span id="L113" class="LineNr">113 </span><span class="Normal">void</span> <a href='035labels.cc.html#L113'>compute_byte_indices_for_labels</a><span class="Delimiter">(</span><span class="Normal">const</span> segment&amp; <a href='031check_operands.cc.html#L11'>code</a><span class="Delimiter">,</span> map&lt;string<span class="Delimiter">,</span> <span class="Normal">int32_t</span>&gt;&amp; byte_index<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L114" class="LineNr">114 </span>  <span class="Normal">int</span> current_byte = <span class="Constant">0</span><span class="Delimiter">;</span>
<span id="L115" class="LineNr">115 </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 &lt; <a href='001help.cc.html#L166'>SIZE</a><span class="Delimiter">(</span><a href='031check_operands.cc.html#L11'>code</a><span class="Delimiter">.</span><a href='011run.cc.html#L105'>lines</a><span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L116" class="LineNr">116 </span>    <span class="Normal">const</span> line&amp; inst = <a href='031check_operands.cc.html#L11'>code</a><span class="Delimiter">.</span><a href='011run.cc.html#L105'>lines</a><span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
<span id="L117" class="LineNr">117 </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 &lt; <a href='001help.cc.html#L166'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span><a href='011run.cc.html#L114'>words</a><span class="Delimiter">);</span>  ++j<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L118" class="LineNr">118 </span>      <span class="Normal">const</span> word&amp; curr = inst<span class="Delimiter">.</span><a href='011run.cc.html#L114'>words</a><span class="Delimiter">.</span>at<span class="Delimiter">(</span>j<span class="Delimiter">);</span>
<span id="L119" class="LineNr">119 </span>      <span class="Comment">// hack: if we have any operand metadata left after previous transforms,</span>
<span id="L120" class="LineNr">120 </span>      <span class="Comment">// deduce its size</span>
<span id="L121" class="LineNr">121 </span>      <span class="Comment">// Maybe we should just move this transform to before instruction</span>
<span id="L122" class="LineNr">122 </span>      <span class="Comment">// packing, and deduce the size of *all* operands. But then we'll also</span>
<span id="L123" class="LineNr">123 </span>      <span class="Comment">// have to deal with bitfields.</span>
<span id="L124" class="LineNr">124 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>has_operand_metadata<span class="Delimiter">(</span>curr<span class="Delimiter">,</span> <span class="Constant">&quot;disp32&quot;</span><span class="Delimiter">)</span> || has_operand_metadata<span class="Delimiter">(</span>curr<span class="Delimiter">,</span> <span class="Constant">&quot;imm32&quot;</span><span class="Delimiter">))</span> <span class="Delimiter">{</span>
<span id="L125" class="LineNr">125 </span>        <span class="Normal">if</span> <span class="Delimiter">(</span>*curr<span class="Delimiter">.</span>data<span class="Delimiter">.</span>rbegin<span class="Delimiter">()</span> == <span class="Constant">':'</span><span class="Delimiter">)</span>
<span id="L126" class="LineNr">126 </span>          <a href='003trace.cc.html#L190'>raise</a> &lt;&lt; <span class="Constant">&quot;'&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>inst<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;': don't use ':' when jumping to labels\n&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
<span id="L127" class="LineNr">127 </span>        current_byte += <span class="Constant">4</span><span class="Delimiter">;</span>
<span id="L128" class="LineNr">128 </span>      <span class="Delimiter">}</span>
<span id="L129" class="LineNr">129 </span>      <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>has_operand_metadata<span class="Delimiter">(</span>curr<span class="Delimiter">,</span> <span class="Constant">&quot;disp16&quot;</span><span class="Delimiter">))</span> <span class="Delimiter">{</span>
<span id="L130" class="LineNr">130 </span>        <span class="Normal">if</span> <span class="Delimiter">(</span>*curr<span class="Delimiter">.</span>data<span class="Delimiter">.</span>rbegin<span class="Delimiter">()</span> == <span class="Constant">':'</span><span class="Delimiter">)</span>
<span id="L131" class="LineNr">131 </span>          <a href='003trace.cc.html#L190'>raise</a> &lt;&lt; <span class="Constant">&quot;'&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>inst<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;': don't use ':' when jumping to labels\n&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
<span id="L132" class="LineNr">132 </span>        current_byte += <span class="Constant">2</span><span class="Delimiter">;</span>
<span id="L133" class="LineNr">133 </span>      <span class="Delimiter">}</span>
<span id="L134" class="LineNr">134 </span>      <span class="Comment">// automatically handle /disp8 and /imm8 here</span>
<span id="L135" class="LineNr">135 </span>      <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>*curr<span class="Delimiter">.</span>data<span class="Delimiter">.</span>rbegin<span class="Delimiter">()</span> != <span class="Constant">':'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L136" class="LineNr">136 </span>        ++current_byte<span class="Delimiter">;</span>
<span id="L137" class="LineNr">137 </span>      <span class="Delimiter">}</span>
<span id="L138" class="LineNr">138 </span>      <span class="Normal">else</span> <span class="Delimiter">{</span>
<span id="L139" class="LineNr">139 </span>        string label = <a href='035labels.cc.html#L234'>drop_last</a><span class="Delimiter">(</span>curr<span class="Delimiter">.</span>data<span class="Delimiter">);</span>
<span id="L140" class="LineNr">140 </span>        <span class="Comment">// ensure labels look sufficiently different from raw hex</span>
<span id="L141" class="LineNr">141 </span>        <a href='035labels.cc.html#L71'>check_valid_name</a><span class="Delimiter">(</span>label<span class="Delimiter">);</span>
<span id="L142" class="LineNr">142 </span>        <span class="Normal">if</span> <span class="Delimiter">(</span><a href='003trace.cc.html#L204'>trace_contains_errors</a><span class="Delimiter">())</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
<span id="L143" class="LineNr">143 </span>        <span class="Normal">if</span> <span class="Delimiter">(</span><a href='030---operands.cc.html#L396'>contains_any_operand_metadata</a><span class="Delimiter">(</span>curr<span class="Delimiter">))</span>
<span id="L144" class="LineNr">144 </span>          <a href='003trace.cc.html#L190'>raise</a> &lt;&lt; <span class="Constant">&quot;'&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>inst<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;': label definition (':') not allowed in operand\n&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
<span id="L145" class="LineNr">145 </span>        <span class="Normal">if</span> <span class="Delimiter">(</span>j &gt; <span class="Constant">0</span><span class="Delimiter">)</span>
<span id="L146" class="LineNr">146 </span>          <a href='003trace.cc.html#L190'>raise</a> &lt;&lt; <span class="Constant">&quot;'&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>inst<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;': labels can only be the first <a href='011run.cc.html#L119'>word</a> in a line.\n&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
<span id="L147" class="LineNr">147 </span>        <span class="Normal">if</span> <span class="Delimiter">(</span><span class="Special"><a href='035labels.cc.html#L163'>Map_file</a></span><span class="Delimiter">.</span>is_open<span class="Delimiter">())</span>
<span id="L148" class="LineNr">148 </span>          <span class="Special"><a href='035labels.cc.html#L163'>Map_file</a></span> &lt;&lt; <span class="Constant">&quot;0x&quot;</span> &lt;&lt; <a href='010---vm.cc.html#L413'>HEXWORD</a> &lt;&lt; <span class="Delimiter">(</span><a href='031check_operands.cc.html#L11'>code</a><span class="Delimiter">.</span>start + current_byte<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">' '</span> &lt;&lt; label &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
<span id="L149" class="LineNr">149 </span>        <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L256'>contains_key</a><span class="Delimiter">(</span>byte_index<span class="Delimiter">,</span> label<span class="Delimiter">)</span> &amp;&amp; label != <span class="Constant">&quot;Entry&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L150" class="LineNr">150 </span>          <a href='003trace.cc.html#L190'>raise</a> &lt;&lt; <span class="Constant">&quot;duplicate label '&quot;</span> &lt;&lt; label &lt;&lt; <span class="Constant">&quot;'\n&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
<span id="L151" class="LineNr">151 </span>          <span class="Identifier">return</span><span class="Delimiter">;</span>
<span id="L152" class="LineNr">152 </span>        <span class="Delimiter">}</span>
<span id="L153" class="LineNr">153 </span>        <a href='001help.cc.html#L252'>put</a><span class="Delimiter">(</span>byte_index<span class="Delimiter">,</span> label<span class="Delimiter">,</span> current_byte<span class="Delimiter">);</span>
<span id="L154" class="LineNr">154 </span>        <a href='003trace.cc.html#L183'>trace</a><span class="Delimiter">(</span><span class="Constant">99</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;label '&quot;</span> &lt;&lt; label &lt;&lt; <span class="Constant">&quot;' is at address &quot;</span> &lt;&lt; <span class="Delimiter">(</span>current_byte+code<span class="Delimiter">.</span>start<span class="Delimiter">)</span> &lt;&lt; end<span class="Delimiter">();</span>
<span id="L155" class="LineNr">155 </span>        <span class="Comment">// no modifying current_byte; label definitions won't be in the final binary</span>
<span id="L156" class="LineNr">156 </span>      <span class="Delimiter">}</span>
<span id="L157" class="LineNr">157 </span>    <span class="Delimiter">}</span>
<span id="L158" class="LineNr">158 </span>  <span class="Delimiter">}</span>
<span id="L159" class="LineNr">159 </span><span class="Delimiter">}</span>
<span id="L160" class="LineNr">160 </span>
<span id="L161" class="LineNr">161 </span><span class="Delimiter">:(before &quot;End Globals&quot;)</span>
<span id="L162" class="LineNr">162 </span><span class="Normal">bool</span> <span class="Special"><a href='035labels.cc.html#L162'>Dump_map</a></span> =<span class="Constant"> false</span><span class="Delimiter">;</span>  <span class="Comment">// currently used only by 'subx translate'</span>
<span id="L163" class="LineNr">163 </span>ofstream <span class="Special"><a href='035labels.cc.html#L163'>Map_file</a></span><span class="Delimiter">;</span>
<span id="L164" class="LineNr">164 </span><span class="Delimiter">:(before &quot;End Commandline Options&quot;)</span>
<span id="L165" class="LineNr">165 </span><span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L98'>is_equal</a><span class="Delimiter">(</span>*arg<span class="Delimiter">,</span> <span class="Constant">&quot;--map&quot;</span><span class="Delimiter">))</span> <span class="Delimiter">{</span>
<span id="L166" class="LineNr">166 </span>  <span class="Special"><a href='035labels.cc.html#L162'>Dump_map</a></span> =<span class="Constant"> true</span><span class="Delimiter">;</span>
<span id="L167" class="LineNr">167 </span>  <span class="Comment">// End --map Settings</span>
<span id="L168" class="LineNr">168 </span><span class="Delimiter">}</span>
<span id="L169" class="LineNr">169 </span><span class="Comment">//: wait to open &quot;map&quot; for writing until we're sure we aren't trying to read it</span>
<span id="L170" class="LineNr">170 </span><span class="Delimiter">:(after &quot;Begin subx translate&quot;)</span>
<span id="L171" class="LineNr">171 </span><span class="Normal">if</span> <span class="Delimiter">(</span><span class="Special"><a href='035labels.cc.html#L162'>Dump_map</a></span><span class="Delimiter">)</span>
<span id="L172" class="LineNr">172 </span>  <span class="Special"><a href='035labels.cc.html#L163'>Map_file</a></span><span class="Delimiter">.</span>open<span class="Delimiter">(</span><span class="Constant">&quot;map&quot;</span><span class="Delimiter">);</span>
<span id="L173" class="LineNr">173 </span><span class="Delimiter">:(before &quot;End subx translate&quot;)</span>
<span id="L174" class="LineNr">174 </span><span class="Normal">if</span> <span class="Delimiter">(</span><span class="Special"><a href='035labels.cc.html#L162'>Dump_map</a></span><span class="Delimiter">)</span>
<span id="L175" class="LineNr">175 </span>  <span class="Special"><a href='035labels.cc.html#L163'>Map_file</a></span><span class="Delimiter">.</span>close<span class="Delimiter">();</span>
<span id="L176" class="LineNr">176 </span>
<span id="L177" class="LineNr">177 </span><span class="Delimiter">:(code)</span>
<span id="L178" class="LineNr">178 </span><span class="Normal">void</span> <a href='035labels.cc.html#L178'>drop_labels</a><span class="Delimiter">(</span>segment&amp; <a href='031check_operands.cc.html#L11'>code</a><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L179" class="LineNr">179 </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 &lt; <a href='001help.cc.html#L166'>SIZE</a><span class="Delimiter">(</span><a href='031check_operands.cc.html#L11'>code</a><span class="Delimiter">.</span><a href='011run.cc.html#L105'>lines</a><span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L180" class="LineNr">180 </span>    line&amp; inst = <a href='031check_operands.cc.html#L11'>code</a><span class="Delimiter">.</span><a href='011run.cc.html#L105'>lines</a><span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
<span id="L181" class="LineNr">181 </span>    vector&lt;word&gt;::iterator new_end = remove_if<span class="Delimiter">(</span>inst<span class="Delimiter">.</span><a href='011run.cc.html#L114'>words</a><span class="Delimiter">.</span>begin<span class="Delimiter">(),</span> inst<span class="Delimiter">.</span><a href='011run.cc.html#L114'>words</a><span class="Delimiter">.</span>end<span class="Delimiter">(),</span> <a href='035labels.cc.html#L186'>is_label</a><span class="Delimiter">);</span>
<span id="L182" class="LineNr">182 </span>    inst<span class="Delimiter">.</span><a href='011run.cc.html#L114'>words</a><span class="Delimiter">.</span>erase<span class="Delimiter">(</span>new_end<span class="Delimiter">,</span> inst<span class="Delimiter">.</span><a href='011run.cc.html#L114'>words</a><span class="Delimiter">.</span>end<span class="Delimiter">());</span>
<span id="L183" class="LineNr">183 </span>  <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">bool</span> <a href='035labels.cc.html#L186'>is_label</a><span class="Delimiter">(</span><span class="Normal">const</span> word&amp; w<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L187" class="LineNr">187 </span>  <span class="Identifier">return</span> *w<span class="Delimiter">.</span>data<span class="Delimiter">.</span>rbegin<span class="Delimiter">()</span> == <span class="Constant">':'</span><span class="Delimiter">;</span>
<span id="L188" class="LineNr">188 </span><span class="Delimiter">}</span>
<span id="L189" class="LineNr">189 </span>
<span id="L190" class="LineNr">190 </span><span class="Normal">void</span> <a href='035labels.cc.html#L190'>replace_labels_with_displacements</a><span class="Delimiter">(</span>segment&amp; <a href='031check_operands.cc.html#L11'>code</a><span class="Delimiter">,</span> <span class="Normal">const</span> map&lt;string<span class="Delimiter">,</span> <span class="Normal">int32_t</span>&gt;&amp; byte_index<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L191" class="LineNr">191 </span>  <span class="Normal">int32_t</span> byte_index_next_instruction_starts_at = <span class="Constant">0</span><span class="Delimiter">;</span>
<span id="L192" class="LineNr">192 </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 &lt; <a href='001help.cc.html#L166'>SIZE</a><span class="Delimiter">(</span><a href='031check_operands.cc.html#L11'>code</a><span class="Delimiter">.</span><a href='011run.cc.html#L105'>lines</a><span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L193" class="LineNr">193 </span>    line&amp; inst = <a href='031check_operands.cc.html#L11'>code</a><span class="Delimiter">.</span><a href='011run.cc.html#L105'>lines</a><span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
<span id="L194" class="LineNr">194 </span>    byte_index_next_instruction_starts_at += <a href='034compute_segment_address.cc.html#L131'>num_bytes</a><span class="Delimiter">(</span>inst<span class="Delimiter">);</span>
<span id="L195" class="LineNr">195 </span>    <a href='011run.cc.html#L113'>line</a> new_inst<span class="Delimiter">;</span>
<span id="L196" class="LineNr">196 </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 &lt; <a href='001help.cc.html#L166'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span><a href='011run.cc.html#L114'>words</a><span class="Delimiter">);</span>  ++j<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L197" class="LineNr">197 </span>      <span class="Normal">const</span> word&amp; curr = inst<span class="Delimiter">.</span><a href='011run.cc.html#L114'>words</a><span class="Delimiter">.</span>at<span class="Delimiter">(</span>j<span class="Delimiter">);</span>
<span id="L198" class="LineNr">198 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L256'>contains_key</a><span class="Delimiter">(</span>byte_index<span class="Delimiter">,</span> curr<span class="Delimiter">.</span>data<span class="Delimiter">))</span> <span class="Delimiter">{</span>
<span id="L199" class="LineNr">199 </span>        <span class="Normal">int32_t</span> displacement = <span class="Normal">static_cast</span>&lt;<span class="Normal">int32_t</span>&gt;<span class="Delimiter">(</span>get<span class="Delimiter">(</span>byte_index<span class="Delimiter">,</span> curr<span class="Delimiter">.</span>data<span class="Delimiter">))</span> - byte_index_next_instruction_starts_at<span class="Delimiter">;</span>
<span id="L200" class="LineNr">200 </span>        <span class="Normal">if</span> <span class="Delimiter">(</span>has_operand_metadata<span class="Delimiter">(</span>curr<span class="Delimiter">,</span> <span class="Constant">&quot;disp8&quot;</span><span class="Delimiter">))</span> <span class="Delimiter">{</span>
<span id="L201" class="LineNr">201 </span>          <span class="Normal">if</span> <span class="Delimiter">(</span>displacement &gt; <span class="Constant">0xff</span> || displacement &lt; -<span class="Constant">0x7f</span><span class="Delimiter">)</span>
<span id="L202" class="LineNr">202 </span>            <a href='003trace.cc.html#L190'>raise</a> &lt;&lt; <span class="Constant">&quot;'&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>inst<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;': label too far away for displacement &quot;</span> &lt;&lt; std::hex &lt;&lt; displacement &lt;&lt; <span class="Constant">&quot; to fit in 8 bits\n&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
<span id="L203" class="LineNr">203 </span>          <span class="Normal">else</span>
<span id="L204" class="LineNr">204 </span>            emit_hex_bytes<span class="Delimiter">(</span>new_inst<span class="Delimiter">,</span> displacement<span class="Delimiter">,</span> <span class="Constant">1</span><span class="Delimiter">);</span>
<span id="L205" class="LineNr">205 </span>        <span class="Delimiter">}</span>
<span id="L206" class="LineNr">206 </span>        <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>has_operand_metadata<span class="Delimiter">(</span>curr<span class="Delimiter">,</span> <span class="Constant">&quot;disp16&quot;</span><span class="Delimiter">))</span> <span class="Delimiter">{</span>
<span id="L207" class="LineNr">207 </span>          <span class="Normal">if</span> <span class="Delimiter">(</span>displacement &gt; <span class="Constant">0xffff</span> || displacement &lt; -<span class="Constant">0x7fff</span><span class="Delimiter">)</span>
<span id="L208" class="LineNr">208 </span>            <a href='003trace.cc.html#L190'>raise</a> &lt;&lt; <span class="Constant">&quot;'&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>inst<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;': label too far away for displacement &quot;</span> &lt;&lt; std::hex &lt;&lt; displacement &lt;&lt; <span class="Constant">&quot; to fit in 16 bits\n&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
<span id="L209" class="LineNr">209 </span>          <span class="Normal">else</span>
<span id="L210" class="LineNr">210 </span>            emit_hex_bytes<span class="Delimiter">(</span>new_inst<span class="Delimiter">,</span> displacement<span class="Delimiter">,</span> <span class="Constant">2</span><span class="Delimiter">);</span>
<span id="L211" class="LineNr">211 </span>        <span class="Delimiter">}</span>
<span id="L212" class="LineNr">212 </span>        <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>has_operand_metadata<span class="Delimiter">(</span>curr<span class="Delimiter">,</span> <span class="Constant">&quot;disp32&quot;</span><span class="Delimiter">))</span> <span class="Delimiter">{</span>
<span id="L213" class="LineNr">213 </span>          emit_hex_bytes<span class="Delimiter">(</span>new_inst<span class="Delimiter">,</span> displacement<span class="Delimiter">,</span> <span class="Constant">4</span><span class="Delimiter">);</span>
<span id="L214" class="LineNr">214 </span>        <span class="Delimiter">}</span>
<span id="L215" class="LineNr">215 </span>      <span class="Delimiter">}</span>
<span id="L216" class="LineNr">216 </span>      <span class="Normal">else</span> <span class="Delimiter">{</span>
<span id="L217" class="LineNr">217 </span>        new_inst<span class="Delimiter">.</span><a href='011run.cc.html#L114'>words</a><span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>curr<span class="Delimiter">);</span>
<span id="L218" class="LineNr">218 </span>      <span class="Delimiter">}</span>
<span id="L219" class="LineNr">219 </span>    <span class="Delimiter">}</span>
<span id="L220" class="LineNr">220 </span>    inst<span class="Delimiter">.</span><a href='011run.cc.html#L114'>words</a><span class="Delimiter">.</span>swap<span class="Delimiter">(</span>new_inst<span class="Delimiter">.</span><a href='011run.cc.html#L114'>words</a><span class="Delimiter">);</span>
<span id="L221" class="LineNr">221 </span>    <a href='003trace.cc.html#L183'>trace</a><span class="Delimiter">(</span><span class="Constant">99</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;instruction after <a href='011run.cc.html#L228'>transform</a>: '&quot;</span> &lt;&lt; data_to_string<span class="Delimiter">(</span>inst<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
<span id="L222" class="LineNr">222 </span>  <span class="Delimiter">}</span>
<span id="L223" class="LineNr">223 </span><span class="Delimiter">}</span>
<span id="L224" class="LineNr">224 </span>
<span id="L225" class="LineNr">225 </span>string <a href='035labels.cc.html#L225'>data_to_string</a><span class="Delimiter">(</span><span class="Normal">const</span> line&amp; inst<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L226" class="LineNr">226 </span>  ostringstream out<span class="Delimiter">;</span>
<span id="L227" class="LineNr">227 </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 &lt; <a href='001help.cc.html#L166'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span><a href='011run.cc.html#L114'>words</a><span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L228" class="LineNr">228 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>i &gt; <span class="Constant">0</span><span class="Delimiter">)</span> out &lt;&lt; <span class="Constant">' '</span><span class="Delimiter">;</span>
<span id="L229" class="LineNr">229 </span>    out &lt;&lt; inst<span class="Delimiter">.</span><a href='011run.cc.html#L114'>words</a><span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>data<span class="Delimiter">;</span>
<span id="L230" class="LineNr">230 </span>  <span class="Delimiter">}</span>
<span id="L231" class="LineNr">231 </span>  <span class="Identifier">return</span> out<span class="Delimiter">.</span>str<span class="Delimiter">();</span>
<span id="L232" class="LineNr">232 </span><span class="Delimiter">}</span>
<span id="L233" class="LineNr">233 </span>
<span id="L234" class="LineNr">234 </span>string <a href='035labels.cc.html#L234'>drop_last</a><span class="Delimiter">(</span><span class="Normal">const</span> string&amp; s<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L235" class="LineNr">235 </span>  <span class="Identifier">return</span> string<span class="Delimiter">(</span>s<span class="Delimiter">.</span>begin<span class="Delimiter">(),</span> --s<span class="Delimiter">.</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="Comment">//: Label definitions must be the first word on a line. No jumping inside</span>
<span id="L239" class="LineNr">239 </span><span class="Comment">//: instructions.</span>
<span id="L240" class="LineNr">240 </span><span class="Comment">//: They should also be the only word on a line.</span>
<span id="L241" class="LineNr">241 </span><span class="Comment">//: However, you can absolutely have multiple labels map to the same address,</span>
<span id="L242" class="LineNr">242 </span><span class="Comment">//: as long as they're on separate lines.</span>
<span id="L243" class="LineNr">243 </span>
<span id="L244" class="LineNr">244 </span><span class="Delimiter">:(scenario multiple_labels_at)</span>
<span id="L245" class="LineNr">245 </span>== <span class="Constant">0x1</span>
<span id="L246" class="LineNr">246 </span><span class="Comment"># address 1</span>
<span id="L247" class="LineNr">247 </span><span class="Normal">loop</span>:
<span id="L248" class="LineNr">248 </span> $loop2:
<span id="L249" class="LineNr">249 </span><span class="Comment"># address 1 (labels take up no space)</span>
<span id="L250" class="LineNr">250 </span>    <span class="PreProc">0</span><span class="Constant">5</span>  <span class="Constant">0x0d0c0b0a</span>/imm32
<span id="L251" class="LineNr">251 </span><span class="Comment"># address 6</span>
<span id="L252" class="LineNr">252 </span>    eb  $loop2/disp8
<span id="L253" class="LineNr">253 </span><span class="Comment"># address 8</span>
<span id="L254" class="LineNr">254 </span>    eb  $loop3/disp8
<span id="L255" class="LineNr">255 </span><span class="Comment"># address 0xa</span>
<span id="L256" class="LineNr">256 </span> $loop3:
<span id="L257" class="LineNr">257 </span><span class="traceContains">+transform: label 'loop' is at address 1</span>
<span id="L258" class="LineNr">258 </span><span class="traceContains">+transform: label '$loop2' is at address 1</span>
<span id="L259" class="LineNr">259 </span><span class="traceContains">+transform: label '$loop3' is at address a</span>
<span id="L260" class="LineNr">260 </span><span class="Comment"># first jump is to -7</span>
<span id="L261" class="LineNr">261 </span><span class="traceContains">+transform: instruction after <a href='011run.cc.html#L228'>transform</a>: 'eb f9'</span>
<span id="L262" class="LineNr">262 </span><span class="Comment"># second jump is to 0 (fall through)</span>
<span id="L263" class="LineNr">263 </span><span class="traceContains">+transform: instruction after <a href='011run.cc.html#L228'>transform</a>: 'eb 00'</span>
<span id="L264" class="LineNr">264 </span>
<span id="L265" class="LineNr">265 </span><span class="Delimiter">:(scenario duplicate_label)</span>
<span id="L266" class="LineNr">266 </span><span class="Special">% Hide_errors = true;</span>
<span id="L267" class="LineNr">267 </span>== <span class="Constant">0x1</span>
<span id="L268" class="LineNr">268 </span><span class="Normal">loop</span>:
<span id="L269" class="LineNr">269 </span><span class="Normal">loop</span>:
<span id="L270" class="LineNr">270 </span>    <span class="PreProc">0</span><span class="Constant">5</span>  <span class="Constant">0x0d0c0b0a</span>/imm32
<span id="L271" class="LineNr">271 </span><span class="traceContains">+error: duplicate label 'loop'</span>
<span id="L272" class="LineNr">272 </span>
<span id="L273" class="LineNr">273 </span><span class="Delimiter">:(scenario label_too_short)</span>
<span id="L274" class="LineNr">274 </span><span class="Special">% Hide_errors = true;</span>
<span id="L275" class="LineNr">275 </span>== <span class="Constant">0x1</span>
<span id="L276" class="LineNr">276 </span><span class="Normal">xz</span>:
<span id="L277" class="LineNr">277 </span>  <span class="PreProc">0</span><span class="Constant">5</span>  <span class="Constant">0x0d0c0b0a</span>/imm32
<span id="L278" class="LineNr">278 </span><span class="traceContains">+error: 'xz' is two characters long which can look like raw hex bytes at a glance; use a different name</span>
<span id="L279" class="LineNr">279 </span>
<span id="L280" class="LineNr">280 </span><span class="Delimiter">:(scenario label_hex)</span>
<span id="L281" class="LineNr">281 </span><span class="Special">% Hide_errors = true;</span>
<span id="L282" class="LineNr">282 </span>== <span class="Constant">0x1</span>
<span id="L283" class="LineNr">283 </span><span class="Constant">0xab</span>:
<span id="L284" class="LineNr">284 </span>  <span class="PreProc">0</span><span class="Constant">5</span>  <span class="Constant">0x0d0c0b0a</span>/imm32
<span id="L285" class="LineNr">285 </span><span class="traceContains">+error: '0xab' looks like a hex number; use a different name</span>
<span id="L286" class="LineNr">286 </span>
<span id="L287" class="LineNr">287 </span><span class="Delimiter">:(scenario label_negative_hex)</span>
<span id="L288" class="LineNr">288 </span><span class="Special">% Hide_errors = true;</span>
<span id="L289" class="LineNr">289 </span>== <span class="Constant">0x1</span>
<span id="L290" class="LineNr">290 </span> -a:  <span class="Comment"># indent to avoid looking like a trace_should_not_contain command for this scenario</span>
<span id="L291" class="LineNr">291 </span>    <span class="PreProc">0</span><span class="Constant">5</span>  <span class="Constant">0x0d0c0b0a</span>/imm32
<span id="L292" class="LineNr">292 </span><span class="traceContains">+error: '-a' starts with '-', which can be confused with a negative number; use a different name</span>
<span id="L293" class="LineNr">293 </span>
<span id="L294" class="LineNr">294 </span><span class="Comment">//: now that we have labels, we need to adjust segment size computation to</span>
<span id="L295" class="LineNr">295 </span><span class="Comment">//: ignore them.</span>
<span id="L296" class="LineNr">296 </span>
<span id="L297" class="LineNr">297 </span><span class="Delimiter">:(scenario segment_size_ignores_labels)</span>
<span id="L298" class="LineNr">298 </span>== <a href='031check_operands.cc.html#L11'>code</a>  <span class="Comment"># 0x09000074</span>
<span id="L299" class="LineNr">299 </span>  <span class="PreProc">0</span><span class="Constant">5</span>/add  <span class="Constant">0x0d0c0b0a</span>/imm32  <span class="Comment"># 5 bytes</span>
<span id="L300" class="LineNr">300 </span><span class="Normal">foo</span>:                      <span class="Comment"># 0 bytes</span>
<span id="L301" class="LineNr">301 </span>== data  <span class="Comment"># 0x0a000079</span>
<span id="L302" class="LineNr">302 </span><span class="Normal">bar</span>:
<span id="L303" class="LineNr">303 </span>  <span class="PreProc">0</span><span class="Constant">0</span>
<span id="L304" class="LineNr">304 </span><span class="traceContains">+transform: segment 1 begins at address 0x0a000079</span>
<span id="L305" class="LineNr">305 </span>
<span id="L306" class="LineNr">306 </span><span class="Delimiter">:(before &quot;End size_of(word w) Special-cases&quot;)</span>
<span id="L307" class="LineNr">307 </span><span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='035labels.cc.html#L186'>is_label</a><span class="Delimiter">(</span>w<span class="Delimiter">))</span>
<span id="L308" class="LineNr">308 </span>  <span class="Identifier">return</span> <span class="Constant">0</span><span class="Delimiter">;</span>
</pre>
</body>
</html>
<!-- vim: set foldmethod=manual : -->
generated by cgit-pink 1.4.1-2-gfad0 (git 2.36.2.497.gbbea4dcf42) at 2024-06-28 02:55:54 +0000