subx/examples/Readme.md


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Small example programs, each with a simple pedagogical goal.

They also help to validate SubX instruction semantics against native x86
hardware. For example, loading a single byte to a register would for some time
clear the rest of the register. This behavior was internally consistent with
unit tests. It took running an example binary natively to catch the discrepancy.
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<a href='https://github.com/akkartik/mu/blob/master/034check_operand_bounds.cc'>https://github.com/akkartik/mu/blob/master/034check_operand_bounds.cc</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr">  1 </span><span class="SalientComment">//:: Check that the different operands of an instruction aren't too large for their bitfields.</span>
<span id="L2" class="LineNr">  2 </span>
<span id="L3" class="LineNr">  3 </span><span class="Normal">void</span> <a href='034check_operand_bounds.cc.html#L3'>test_check_bitfield_sizes</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
<span id="L4" class="LineNr">  4 </span>  <span class="Special">Hide_errors</span> = <span class="Constant">true</span><span class="Delimiter">;</span>
<span id="L5" class="LineNr">  5 </span>  <a href='011run.cc.html#L82'>run</a><span class="Delimiter">(</span>
<span id="L6" class="LineNr">  6 </span>      <span class="Constant">&quot;== code 0x1\n&quot;</span>
<span id="L7" class="LineNr">  7 </span>      <span class="Constant">&quot;01/add 4/mod 3/rm32 1/r32\n&quot;</span>  <span class="Comment">// add ECX to EBX</span>
<span id="L8" class="LineNr">  8 </span>  <span class="Delimiter">);</span>
<span id="L9" class="LineNr">  9 </span>  <a href='003trace.cc.html#L292'>CHECK_TRACE_CONTENTS</a><span class="Delimiter">(</span>
<span id="L10" class="LineNr"> 10 </span>      <span class="Constant">&quot;error: '4/mod' too large to fit in bitfield mod\n&quot;</span>
<span id="L11" class="LineNr"> 11 </span>  <span class="Delimiter">);</span>
<span id="L12" class="LineNr"> 12 </span><span class="Delimiter">}</span>
<span id="L13" class="LineNr"> 13 </span>
<span id="L14" class="LineNr"> 14 </span><span class="Delimiter">:(before &quot;End Globals&quot;)</span>
<span id="L15" class="LineNr"> 15 </span>map&lt;string<span class="Delimiter">,</span> <span class="Normal">uint32_t</span>&gt; <span class="Special"><a href='034check_operand_bounds.cc.html#L15'>Operand_bound</a></span><span class="Delimiter">;</span>
<span id="L16" class="LineNr"> 16 </span><span class="Delimiter">:(before &quot;End One-time Setup&quot;)</span>
<span id="L17" class="LineNr"> 17 </span><a href='001help.cc.html#L239'>put_new</a><span class="Delimiter">(</span><span class="Special"><a href='034check_operand_bounds.cc.html#L15'>Operand_bound</a></span><span class="Delimiter">,</span> <span class="Constant">&quot;subop&quot;</span><span class="Delimiter">,</span> <span class="Constant">1</span>&lt;&lt;<span class="Constant">3</span><span class="Delimiter">);</span>
<span id="L18" class="LineNr"> 18 </span><a href='001help.cc.html#L239'>put_new</a><span class="Delimiter">(</span><span class="Special"><a href='034check_operand_bounds.cc.html#L15'>Operand_bound</a></span><span class="Delimiter">,</span> <span class="Constant">&quot;mod&quot;</span><span class="Delimiter">,</span> <span class="Constant">1</span>&lt;&lt;<span class="Constant">2</span><span class="Delimiter">);</span>
<span id="L19" class="LineNr"> 19 </span><a href='001help.cc.html#L239'>put_new</a><span class="Delimiter">(</span><span class="Special"><a href='034check_operand_bounds.cc.html#L15'>Operand_bound</a></span><span class="Delimiter">,</span> <span class="Constant">&quot;rm32&quot;</span><span class="Delimiter">,</span> <span class="Constant">1</span>&lt;&lt;<span class="Constant">3</span><span class="Delimiter">);</span>
<span id="L20" class="LineNr"> 20 </span><a href='001help.cc.html#L239'>put_new</a><span class="Delimiter">(</span><span class="Special"><a href='034check_operand_bounds.cc.html#L15'>Operand_bound</a></span><span class="Delimiter">,</span> <span class="Constant">&quot;base&quot;</span><span class="Delimiter">,</span> <span class="Constant">1</span>&lt;&lt;<span class="Constant">3</span><span class="Delimiter">);</span>
<span id="L21" class="LineNr"> 21 </span><a href='001help.cc.html#L239'>put_new</a><span class="Delimiter">(</span><span class="Special"><a href='034check_operand_bounds.cc.html#L15'>Operand_bound</a></span><span class="Delimiter">,</span> <span class="Constant">&quot;index&quot;</span><span class="Delimiter">,</span> <span class="Constant">1</span>&lt;&lt;<span class="Constant">3</span><span class="Delimiter">);</span>
<span id="L22" class="LineNr"> 22 </span><a href='001help.cc.html#L239'>put_new</a><span class="Delimiter">(</span><span class="Special"><a href='034check_operand_bounds.cc.html#L15'>Operand_bound</a></span><span class="Delimiter">,</span> <span class="Constant">&quot;scale&quot;</span><span class="Delimiter">,</span> <span class="Constant">1</span>&lt;&lt;<span class="Constant">2</span><span class="Delimiter">);</span>
<span id="L23" class="LineNr"> 23 </span><a href='001help.cc.html#L239'>put_new</a><span class="Delimiter">(</span><span class="Special"><a href='034check_operand_bounds.cc.html#L15'>Operand_bound</a></span><span class="Delimiter">,</span> <span class="Constant">&quot;r32&quot;</span><span class="Delimiter">,</span> <span class="Constant">1</span>&lt;&lt;<span class="Constant">3</span><span class="Delimiter">);</span>
<span id="L24" class="LineNr"> 24 </span><a href='001help.cc.html#L239'>put_new</a><span class="Delimiter">(</span><span class="Special"><a href='034check_operand_bounds.cc.html#L15'>Operand_bound</a></span><span class="Delimiter">,</span> <span class="Constant">&quot;disp8&quot;</span><span class="Delimiter">,</span> <span class="Constant">1</span>&lt;&lt;<span class="Constant">8</span><span class="Delimiter">);</span>
<span id="L25" class="LineNr"> 25 </span><a href='001help.cc.html#L239'>put_new</a><span class="Delimiter">(</span><span class="Special"><a href='034check_operand_bounds.cc.html#L15'>Operand_bound</a></span><span class="Delimiter">,</span> <span class="Constant">&quot;disp16&quot;</span><span class="Delimiter">,</span> <span class="Constant">1</span>&lt;&lt;<span class="Constant">16</span><span class="Delimiter">);</span>
<span id="L26" class="LineNr"> 26 </span><span class="Comment">// no bound needed for disp32</span>
<span id="L27" class="LineNr"> 27 </span><a href='001help.cc.html#L239'>put_new</a><span class="Delimiter">(</span><span class="Special"><a href='034check_operand_bounds.cc.html#L15'>Operand_bound</a></span><span class="Delimiter">,</span> <span class="Constant">&quot;imm8&quot;</span><span class="Delimiter">,</span> <span class="Constant">1</span>&lt;&lt;<span class="Constant">8</span><span class="Delimiter">);</span>
<span id="L28" class="LineNr"> 28 </span><span class="Comment">// no bound needed for imm32</span>
<span id="L29" class="LineNr"> 29 </span>
<span id="L30" class="LineNr"> 30 </span><span class="Delimiter">:(before &quot;Pack Operands(segment code)&quot;)</span>
<span id="L31" class="LineNr"> 31 </span>check_operand_bounds<span class="Delimiter">(</span>code<span class="Delimiter">);</span>
<span id="L32" class="LineNr"> 32 </span><span class="Normal">if</span> <span class="Delimiter">(</span><a href='003trace.cc.html#L264'>trace_contains_errors</a><span class="Delimiter">())</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
<span id="L33" class="LineNr"> 33 </span><span class="Delimiter">:(code)</span>
<span id="L34" class="LineNr"> 34 </span><span class="Normal">void</span> check_operand_bounds<span class="Delimiter">(</span><span class="Normal">const</span> segment&amp; code<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L35" class="LineNr"> 35 </span>  <a href='003trace.cc.html#L96'>trace</a><span class="Delimiter">(</span><span class="Constant">3</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;-- check operand bounds&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
<span id="L36" class="LineNr"> 36 </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#L170'>SIZE</a><span class="Delimiter">(</span>code<span class="Delimiter">.</span><a href='011run.cc.html#L113'>lines</a><span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L37" class="LineNr"> 37 </span>    <span class="Normal">const</span> line&amp; inst = code<span class="Delimiter">.</span><a href='011run.cc.html#L113'>lines</a><span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
<span id="L38" class="LineNr"> 38 </span>    <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> j = <a href='033check_operands.cc.html#L310'>first_operand</a><span class="Delimiter">(</span>inst<span class="Delimiter">);</span>  j &lt; <a href='001help.cc.html#L170'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span><a href='011run.cc.html#L122'>words</a><span class="Delimiter">);</span>  ++j<span class="Delimiter">)</span>
<span id="L39" class="LineNr"> 39 </span>      check_operand_bounds<span class="Delimiter">(</span>inst<span class="Delimiter">.</span><a href='011run.cc.html#L122'>words</a><span class="Delimiter">.</span>at<span class="Delimiter">(</span>j<span class="Delimiter">));</span>
<span id="L40" class="LineNr"> 40 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span><a href='003trace.cc.html#L264'>trace_contains_errors</a><span class="Delimiter">())</span> <span class="Identifier">return</span><span class="Delimiter">;</span>  <span class="Comment">// stop at the first mal-formed instruction</span>
<span id="L41" class="LineNr"> 41 </span>  <span class="Delimiter">}</span>
<span id="L42" class="LineNr"> 42 </span><span class="Delimiter">}</span>
<span id="L43" class="LineNr"> 43 </span>
<span id="L44" class="LineNr"> 44 </span><span class="Normal">void</span> check_operand_bounds<span class="Delimiter">(</span><span class="Normal">const</span> word&amp; w<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L45" class="LineNr"> 45 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span>map&lt;string<span class="Delimiter">,</span> <span class="Normal">uint32_t</span>&gt;::iterator p = <span class="Special"><a href='034check_operand_bounds.cc.html#L15'>Operand_bound</a></span><span class="Delimiter">.</span>begin<span class="Delimiter">();</span>  p != <span class="Special"><a href='034check_operand_bounds.cc.html#L15'>Operand_bound</a></span><span class="Delimiter">.</span>end<span class="Delimiter">();</span>  ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L46" class="LineNr"> 46 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!has_operand_metadata<span class="Delimiter">(</span>w<span class="Delimiter">,</span> p<span class="Delimiter">-&gt;</span>first<span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
<span id="L47" class="LineNr"> 47 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!looks_like_hex_int<span class="Delimiter">(</span>w<span class="Delimiter">.</span>data<span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>  <span class="Comment">// later transforms are on their own to do their own bounds checking</span>
<span id="L48" class="LineNr"> 48 </span>    <span class="Normal">int32_t</span> x = <a href='032---operands.cc.html#L507'>parse_int</a><span class="Delimiter">(</span>w<span class="Delimiter">.</span>data<span class="Delimiter">);</span>
<span id="L49" class="LineNr"> 49 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>x &gt;= <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L50" class="LineNr"> 50 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>p<span class="Delimiter">-&gt;</span>first == <span class="Constant">&quot;disp8&quot;</span> || p<span class="Delimiter">-&gt;</span>first == <span class="Constant">&quot;disp16&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L51" class="LineNr"> 51 </span>        <span class="Normal">if</span> <span class="Delimiter">(</span><span class="Normal">static_cast</span>&lt;<span class="Normal">uint32_t</span>&gt;<span class="Delimiter">(</span>x<span class="Delimiter">)</span> &gt;= p<span class="Delimiter">-&gt;</span>second/<span class="Constant">2</span><span class="Delimiter">)</span>
<span id="L52" class="LineNr"> 52 </span>          <a href='003trace.cc.html#L228'>raise</a> &lt;&lt; <span class="Constant">&quot;'&quot;</span> &lt;&lt; w<span class="Delimiter">.</span>original &lt;&lt; <span class="Constant">&quot;' too large to fit in signed bitfield &quot;</span> &lt;&lt; p<span class="Delimiter">-&gt;</span>first &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; end<span class="Delimiter">();</span>
<span id="L53" class="LineNr"> 53 </span>      <span class="Delimiter">}</span>
<span id="L54" class="LineNr"> 54 </span>      <span class="Normal">else</span> <span class="Delimiter">{</span>
<span id="L55" class="LineNr"> 55 </span>        <span class="Normal">if</span> <span class="Delimiter">(</span><span class="Normal">static_cast</span>&lt;<span class="Normal">uint32_t</span>&gt;<span class="Delimiter">(</span>x<span class="Delimiter">)</span> &gt;= p<span class="Delimiter">-&gt;</span>second<span class="Delimiter">)</span>
<span id="L56" class="LineNr"> 56 </span>          <a href='003trace.cc.html#L228'>raise</a> &lt;&lt; <span class="Constant">&quot;'&quot;</span> &lt;&lt; w<span class="Delimiter">.</span>original &lt;&lt; <span class="Constant">&quot;' too large to fit in bitfield &quot;</span> &lt;&lt; p<span class="Delimiter">-&gt;</span>first &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; end<span class="Delimiter">();</span>
<span id="L57" class="LineNr"> 57 </span>      <span class="Delimiter">}</span>
<span id="L58" class="LineNr"> 58 </span>    <span class="Delimiter">}</span>
<span id="L59" class="LineNr"> 59 </span>    <span class="Normal">else</span> <span class="Delimiter">{</span>
<span id="L60" class="LineNr"> 60 </span>      <span class="Comment">// hacky? assuming bound is a power of 2</span>
<span id="L61" class="LineNr"> 61 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>x &lt; -<span class="Constant">1</span>*<span class="Normal">static_cast</span>&lt;<span class="Normal">int32_t</span>&gt;<span class="Delimiter">(</span>p<span class="Delimiter">-&gt;</span>second/<span class="Constant">2</span><span class="Delimiter">))</span>
<span id="L62" class="LineNr"> 62 </span>        <a href='003trace.cc.html#L228'>raise</a> &lt;&lt; <span class="Constant">&quot;'&quot;</span> &lt;&lt; w<span class="Delimiter">.</span>original &lt;&lt; <span class="Constant">&quot;' too large to fit in bitfield &quot;</span> &lt;&lt; p<span class="Delimiter">-&gt;</span>first &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; end<span class="Delimiter">();</span>
<span id="L63" class="LineNr"> 63 </span>    <span class="Delimiter">}</span>
<span id="L64" class="LineNr"> 64 </span>  <span class="Delimiter">}</span>
<span id="L65" class="LineNr"> 65 </span><span class="Delimiter">}</span>
<span id="L66" class="LineNr"> 66 </span>
<span id="L67" class="LineNr"> 67 </span><span class="Normal">void</span> <a href='034check_operand_bounds.cc.html#L67'>test_check_bitfield_sizes_for_imm8</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
<span id="L68" class="LineNr"> 68 </span>  <a href='011run.cc.html#L82'>run</a><span class="Delimiter">(</span>
<span id="L69" class="LineNr"> 69 </span>      <span class="Constant">&quot;== code 0x1\n&quot;</span>
<span id="L70" class="LineNr"> 70 </span>      <span class="Constant">&quot;c1/shift 4/subop/left 3/mod/direct 1/rm32/ECX 0xff/imm8&quot;</span>  <span class="Comment">// shift EBX left</span>
<span id="L71" class="LineNr"> 71 </span>  <span class="Delimiter">);</span>
<span id="L72" class="LineNr"> 72 </span>  <a href='002test.cc.html#L24'>CHECK</a><span class="Delimiter">(</span>!trace_contains_errors<span class="Delimiter">());</span>
<span id="L73" class="LineNr"> 73 </span><span class="Delimiter">}</span>
<span id="L74" class="LineNr"> 74 </span>
<span id="L75" class="LineNr"> 75 </span><span class="Normal">void</span> <a href='034check_operand_bounds.cc.html#L75'>test_check_bitfield_sizes_for_imm8_error</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
<span id="L76" class="LineNr"> 76 </span>  <span class="Special">Hide_errors</span> = <span class="Constant">true</span><span class="Delimiter">;</span>
<span id="L77" class="LineNr"> 77 </span>  <a href='011run.cc.html#L82'>run</a><span class="Delimiter">(</span>
<span id="L78" class="LineNr"> 78 </span>      <span class="Constant">&quot;== code 0x1\n&quot;</span>
<span id="L79" class="LineNr"> 79 </span>      <span class="Constant">&quot;c1/shift 4/subop/left 3/mod/direct 1/rm32/ECX 0x100/imm8&quot;</span>  <span class="Comment">// shift EBX left</span>
<span id="L80" class="LineNr"> 80 </span>  <span class="Delimiter">);</span>
<span id="L81" class="LineNr"> 81 </span>  <a href='003trace.cc.html#L292'>CHECK_TRACE_CONTENTS</a><span class="Delimiter">(</span>
<span id="L82" class="LineNr"> 82 </span>      <span class="Constant">&quot;error: '0x100/imm8' too large to fit in bitfield imm8\n&quot;</span>
<span id="L83" class="LineNr"> 83 </span>  <span class="Delimiter">);</span>
<span id="L84" class="LineNr"> 84 </span><span class="Delimiter">}</span>
<span id="L85" class="LineNr"> 85 </span>
<span id="L86" class="LineNr"> 86 </span><span class="Normal">void</span> <a href='034check_operand_bounds.cc.html#L86'>test_check_bitfield_sizes_for_negative_imm8</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
<span id="L87" class="LineNr"> 87 </span>  <a href='011run.cc.html#L82'>run</a><span class="Delimiter">(</span>
<span id="L88" class="LineNr"> 88 </span>      <span class="Constant">&quot;== code 0x1\n&quot;</span>
<span id="L89" class="LineNr"> 89 </span>      <span class="Constant">&quot;c1/shift 4/subop/left 3/mod/direct 1/rm32/ECX -0x80/imm8&quot;</span>  <span class="Comment">// shift EBX left</span>
<span id="L90" class="LineNr"> 90 </span>  <span class="Delimiter">);</span>
<span id="L91" class="LineNr"> 91 </span>  <a href='002test.cc.html#L24'>CHECK</a><span class="Delimiter">(</span>!trace_contains_errors<span class="Delimiter">());</span>
<span id="L92" class="LineNr"> 92 </span><span class="Delimiter">}</span>
<span id="L93" class="LineNr"> 93 </span>
<span id="L94" class="LineNr"> 94 </span><span class="Normal">void</span> <a href='034check_operand_bounds.cc.html#L94'>test_check_bitfield_sizes_for_negative_imm8_error</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
<span id="L95" class="LineNr"> 95 </span>  <span class="Special">Hide_errors</span> = <span class="Constant">true</span><span class="Delimiter">;</span>
<span id="L96" class="LineNr"> 96 </span>  <a href='011run.cc.html#L82'>run</a><span class="Delimiter">(</span>
<span id="L97" class="LineNr"> 97 </span>      <span class="Constant">&quot;== code 0x1\n&quot;</span>
<span id="L98" class="LineNr"> 98 </span>      <span class="Constant">&quot;c1/shift 4/subop/left 3/mod/direct 1/rm32/ECX -0x81/imm8&quot;</span>  <span class="Comment">// shift EBX left</span>
<span id="L99" class="LineNr"> 99 </span>  <span class="Delimiter">);</span>
<span id="L100" class="LineNr">100 </span>  <a href='003trace.cc.html#L292'>CHECK_TRACE_CONTENTS</a><span class="Delimiter">(</span>
<span id="L101" class="LineNr">101 </span>      <span class="Constant">&quot;error: '-0x81/imm8' too large to fit in bitfield imm8\n&quot;</span>
<span id="L102" class="LineNr">102 </span>  <span class="Delimiter">);</span>
<span id="L103" class="LineNr">103 </span><span class="Delimiter">}</span>
<span id="L104" class="LineNr">104 </span>
<span id="L105" class="LineNr">105 </span><span class="Normal">void</span> <a href='034check_operand_bounds.cc.html#L105'>test_check_bitfield_sizes_for_disp8</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
<span id="L106" class="LineNr">106 </span>  <span class="Comment">// not bothering to run</span>
<span id="L107" class="LineNr">107 </span>  transform<span class="Delimiter">(</span>
<span id="L108" class="LineNr">108 </span>      <span class="Constant">&quot;== code 0x1\n&quot;</span>
<span id="L109" class="LineNr">109 </span>      <span class="Constant">&quot;01/add 1/mod/*+disp8 3/rm32 1/r32 0x7f/disp8\n&quot;</span>  <span class="Comment">// add ECX to *(EBX+0x7f)</span>
<span id="L110" class="LineNr">110 </span>  <span class="Delimiter">);</span>
<span id="L111" class="LineNr">111 </span>  <a href='002test.cc.html#L24'>CHECK</a><span class="Delimiter">(</span>!trace_contains_errors<span class="Delimiter">());</span>
<span id="L112" class="LineNr">112 </span><span class="Delimiter">}</span>
<span id="L113" class="LineNr">113 </span>
<span id="L114" class="LineNr">114 </span><span class="Normal">void</span> <a href='034check_operand_bounds.cc.html#L114'>test_check_bitfield_sizes_for_disp8_error</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
<span id="L115" class="LineNr">115 </span>  <span class="Special">Hide_errors</span> = <span class="Constant">true</span><span class="Delimiter">;</span>
<span id="L116" class="LineNr">116 </span>  <a href='011run.cc.html#L82'>run</a><span class="Delimiter">(</span>
<span id="L117" class="LineNr">117 </span>      <span class="Constant">&quot;== code 0x1\n&quot;</span>
<span id="L118" class="LineNr">118 </span>      <span class="Constant">&quot;01/add 1/mod/*+disp8 3/rm32 1/r32 0x80/disp8\n&quot;</span>  <span class="Comment">// add ECX to *(EBX+0x80)</span>
<span id="L119" class="LineNr">119 </span>  <span class="Delimiter">);</span>
<span id="L120" class="LineNr">120 </span>  <a href='003trace.cc.html#L292'>CHECK_TRACE_CONTENTS</a><span class="Delimiter">(</span>
<span id="L121" class="LineNr">121 </span>      <span class="Constant">&quot;error: '0x80/disp8' too large to fit in signed bitfield disp8\n&quot;</span>
<span id="L122" class="LineNr">122 </span>  <span class="Delimiter">);</span>
<span id="L123" class="LineNr">123 </span><span class="Delimiter">}</span>
<span id="L124" class="LineNr">124 </span>
<span id="L125" class="LineNr">125 </span><span class="Normal">void</span> <a href='034check_operand_bounds.cc.html#L125'>test_check_bitfield_sizes_for_negative_disp8</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
<span id="L126" class="LineNr">126 </span>  <span class="Comment">// not bothering to run</span>
<span id="L127" class="LineNr">127 </span>  transform<span class="Delimiter">(</span>
<span id="L128" class="LineNr">128 </span>      <span class="Constant">&quot;== code 0x1\n&quot;</span>
<span id="L129" class="LineNr">129 </span>      <span class="Constant">&quot;01/add 1/mod/*+disp8 3/rm32 1/r32 -0x80/disp8\n&quot;</span>  <span class="Comment">// add ECX to *(EBX-0x80)</span>
<span id="L130" class="LineNr">130 </span>  <span class="Delimiter">);</span>
<span id="L131" class="LineNr">131 </span>  <a href='002test.cc.html#L24'>CHECK</a><span class="Delimiter">(</span>!trace_contains_errors<span class="Delimiter">());</span>
<span id="L132" class="LineNr">132 </span><span class="Delimiter">}</span>
<span id="L133" class="LineNr">133 </span>
<span id="L134" class="LineNr">134 </span><span class="Normal">void</span> <a href='034check_operand_bounds.cc.html#L134'>test_check_bitfield_sizes_for_negative_disp8_error</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
<span id="L135" class="LineNr">135 </span>  <span class="Special">Hide_errors</span> = <span class="Constant">true</span><span class="Delimiter">;</span>
<span id="L136" class="LineNr">136 </span>  <a href='011run.cc.html#L82'>run</a><span class="Delimiter">(</span>
<span id="L137" class="LineNr">137 </span>      <span class="Constant">&quot;== code 0x1\n&quot;</span>
<span id="L138" class="LineNr">138 </span>      <span class="Constant">&quot;01/add 1/mod/*+disp8 3/rm32 1/r32 -0x81/disp8\n&quot;</span>  <span class="Comment">// add ECX to *(EBX-0x81)</span>
<span id="L139" class="LineNr">139 </span>  <span class="Delimiter">);</span>
<span id="L140" class="LineNr">140 </span>  <a href='003trace.cc.html#L292'>CHECK_TRACE_CONTENTS</a><span class="Delimiter">(</span>
<span id="L141" class="LineNr">141 </span>      <span class="Constant">&quot;error: '-0x81/disp8' too large to fit in bitfield disp8\n&quot;</span>
<span id="L142" class="LineNr">142 </span>  <span class="Delimiter">);</span>
<span id="L143" class="LineNr">143 </span><span class="Delimiter">}</span>
</pre>
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