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<a href='https://github.com/akkartik/mu/blob/master/subx/032check_operand_bounds.cc'>https://github.com/akkartik/mu/blob/master/subx/032check_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="Delimiter">:(scenario check_bitfield_sizes)</span>
<span id="L4" class="LineNr"> 4 </span><span class="Special">% Hide_errors = true;</span>
<span id="L5" class="LineNr"> 5 </span>== <span class="Constant">0x1</span>
<span id="L6" class="LineNr"> 6 </span><span class="PreProc">0</span><span class="Constant">1</span>/add <span class="Constant">4</span>/mod <span class="Constant">3</span>/rm32 <span class="Constant">1</span>/r32 <span class="Comment"># add ECX to EBX</span>
<span id="L7" class="LineNr"> 7 </span><span class="traceContains">+error: '4/mod' too large to fit in bitfield mod</span>
<span id="L8" class="LineNr"> 8 </span>
<span id="L9" class="LineNr"> 9 </span><span class="Delimiter">:(before "End Globals")</span>
<span id="L10" class="LineNr">10 </span>map<string<span class="Delimiter">,</span> <span class="Normal">uint32_t</span>> <span class="Special"><a href='032check_operand_bounds.cc.html#L10'>Operand_bound</a></span><span class="Delimiter">;</span>
<span id="L11" class="LineNr">11 </span><span class="Delimiter">:(before "End One-time Setup")</span>
<span id="L12" class="LineNr">12 </span><a href='001help.cc.html#L262'>put_new</a><span class="Delimiter">(</span><span class="Special"><a href='032check_operand_bounds.cc.html#L10'>Operand_bound</a></span><span class="Delimiter">,</span> <span class="Constant">"subop"</span><span class="Delimiter">,</span> <span class="Constant">1</span><<<span class="Constant">3</span><span class="Delimiter">);</span>
<span id="L13" class="LineNr">13 </span><a href='001help.cc.html#L262'>put_new</a><span class="Delimiter">(</span><span class="Special"><a href='032check_operand_bounds.cc.html#L10'>Operand_bound</a></span><span class="Delimiter">,</span> <span class="Constant">"mod"</span><span class="Delimiter">,</span> <span class="Constant">1</span><<<span class="Constant">2</span><span class="Delimiter">);</span>
<span id="L14" class="LineNr">14 </span><a href='001help.cc.html#L262'>put_new</a><span class="Delimiter">(</span><span class="Special"><a href='032check_operand_bounds.cc.html#L10'>Operand_bound</a></span><span class="Delimiter">,</span> <span class="Constant">"rm32"</span><span class="Delimiter">,</span> <span class="Constant">1</span><<<span class="Constant">3</span><span class="Delimiter">);</span>
<span id="L15" class="LineNr">15 </span><a href='001help.cc.html#L262'>put_new</a><span class="Delimiter">(</span><span class="Special"><a href='032check_operand_bounds.cc.html#L10'>Operand_bound</a></span><span class="Delimiter">,</span> <span class="Constant">"base"</span><span class="Delimiter">,</span> <span class="Constant">1</span><<<span class="Constant">3</span><span class="Delimiter">);</span>
<span id="L16" class="LineNr">16 </span><a href='001help.cc.html#L262'>put_new</a><span class="Delimiter">(</span><span class="Special"><a href='032check_operand_bounds.cc.html#L10'>Operand_bound</a></span><span class="Delimiter">,</span> <span class="Constant">"index"</span><span class="Delimiter">,</span> <span class="Constant">1</span><<<span class="Constant">3</span><span class="Delimiter">);</span>
<span id="L17" class="LineNr">17 </span><a href='001help.cc.html#L262'>put_new</a><span class="Delimiter">(</span><span class="Special"><a href='032check_operand_bounds.cc.html#L10'>Operand_bound</a></span><span class="Delimiter">,</span> <span class="Constant">"scale"</span><span class="Delimiter">,</span> <span class="Constant">1</span><<<span class="Constant">2</span><span class="Delimiter">);</span>
<span id="L18" class="LineNr">18 </span><a href='001help.cc.html#L262'>put_new</a><span class="Delimiter">(</span><span class="Special"><a href='032check_operand_bounds.cc.html#L10'>Operand_bound</a></span><span class="Delimiter">,</span> <span class="Constant">"r32"</span><span class="Delimiter">,</span> <span class="Constant">1</span><<<span class="Constant">3</span><span class="Delimiter">);</span>
<span id="L19" class="LineNr">19 </span><a href='001help.cc.html#L262'>put_new</a><span class="Delimiter">(</span><span class="Special"><a href='032check_operand_bounds.cc.html#L10'>Operand_bound</a></span><span class="Delimiter">,</span> <span class="Constant">"disp8"</span><span class="Delimiter">,</span> <span class="Constant">1</span><<<span class="Constant">8</span><span class="Delimiter">);</span>
<span id="L20" class="LineNr">20 </span><a href='001help.cc.html#L262'>put_new</a><span class="Delimiter">(</span><span class="Special"><a href='032check_operand_bounds.cc.html#L10'>Operand_bound</a></span><span class="Delimiter">,</span> <span class="Constant">"disp16"</span><span class="Delimiter">,</span> <span class="Constant">1</span><<<span class="Constant">16</span><span class="Delimiter">);</span>
<span id="L21" class="LineNr">21 </span><span class="Comment">// no bound needed for disp32</span>
<span id="L22" class="LineNr">22 </span><a href='001help.cc.html#L262'>put_new</a><span class="Delimiter">(</span><span class="Special"><a href='032check_operand_bounds.cc.html#L10'>Operand_bound</a></span><span class="Delimiter">,</span> <span class="Constant">"imm8"</span><span class="Delimiter">,</span> <span class="Constant">1</span><<<span class="Constant">8</span><span class="Delimiter">);</span>
<span id="L23" class="LineNr">23 </span><span class="Comment">// no bound needed for imm32</span>
<span id="L24" class="LineNr">24 </span>
<span id="L25" class="LineNr">25 </span><span class="Delimiter">:(before "Pack Operands(segment code)")</span>
<span id="L26" class="LineNr">26 </span>check_operand_bounds<span class="Delimiter">(</span><a href='031check_operands.cc.html#L11'>code</a><span class="Delimiter">);</span>
<span id="L27" class="LineNr">27 </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="L28" class="LineNr">28 </span><span class="Delimiter">:(code)</span>
<span id="L29" class="LineNr">29 </span><span class="Normal">void</span> check_operand_bounds<span class="Delimiter">(</span><span class="Normal">const</span> segment& <a href='031check_operands.cc.html#L11'>code</a><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L30" class="LineNr">30 </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">"transform"</span><span class="Delimiter">)</span> << <span class="Constant">"-- check operand bounds"</span> << end<span class="Delimiter">();</span>
<span id="L31" class="LineNr">31 </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#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#L109'>lines</a><span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L32" class="LineNr">32 </span> <span class="Normal">const</span> line& inst = <a href='031check_operands.cc.html#L11'>code</a><span class="Delimiter">.</span><a href='011run.cc.html#L109'>lines</a><span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
<span id="L33" class="LineNr">33 </span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> j = <a href='031check_operands.cc.html#L301'>first_operand</a><span class="Delimiter">(</span>inst<span class="Delimiter">);</span> j < <a href='001help.cc.html#L166'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span><a href='011run.cc.html#L118'>words</a><span class="Delimiter">);</span> ++j<span class="Delimiter">)</span>
<span id="L34" class="LineNr">34 </span> check_operand_bounds<span class="Delimiter">(</span>inst<span class="Delimiter">.</span><a href='011run.cc.html#L118'>words</a><span class="Delimiter">.</span>at<span class="Delimiter">(</span>j<span class="Delimiter">));</span>
<span id="L35" class="LineNr">35 </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 class="Comment">// stop at the first mal-formed instruction</span>
<span id="L36" class="LineNr">36 </span> <span class="Delimiter">}</span>
<span id="L37" class="LineNr">37 </span><span class="Delimiter">}</span>
<span id="L38" class="LineNr">38 </span>
<span id="L39" class="LineNr">39 </span><span class="Normal">void</span> check_operand_bounds<span class="Delimiter">(</span><span class="Normal">const</span> word& w<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L40" class="LineNr">40 </span> <span class="Normal">for</span> <span class="Delimiter">(</span>map<string<span class="Delimiter">,</span> <span class="Normal">uint32_t</span>>::iterator p = <span class="Special"><a href='032check_operand_bounds.cc.html#L10'>Operand_bound</a></span><span class="Delimiter">.</span>begin<span class="Delimiter">();</span> p != <span class="Special"><a href='032check_operand_bounds.cc.html#L10'>Operand_bound</a></span><span class="Delimiter">.</span>end<span class="Delimiter">();</span> ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L41" class="LineNr">41 </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">-></span>first<span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
<span id="L42" class="LineNr">42 </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="L43" class="LineNr">43 </span> <span class="Normal">int32_t</span> x = <a href='011run.cc.html#L362'>parse_int</a><span class="Delimiter">(</span>w<span class="Delimiter">.</span>data<span class="Delimiter">);</span>
<span id="L44" class="LineNr">44 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>x >= <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L45" class="LineNr">45 </span> <span class="Normal">if</span> <span class="Delimiter">(</span><span class="Normal">static_cast</span><<span class="Normal">uint32_t</span>><span class="Delimiter">(</span>x<span class="Delimiter">)</span> >= p<span class="Delimiter">-></span>second<span class="Delimiter">)</span>
<span id="L46" class="LineNr">46 </span> <a href='003trace.cc.html#L190'>raise</a> << <span class="Constant">"'"</span> << w<span class="Delimiter">.</span>original << <span class="Constant">"' too large to fit in bitfield "</span> << p<span class="Delimiter">-></span>first << <span class="cSpecial">'\n'</span> << end<span class="Delimiter">();</span>
<span id="L47" class="LineNr">47 </span> <span class="Delimiter">}</span>
<span id="L48" class="LineNr">48 </span> <span class="Normal">else</span> <span class="Delimiter">{</span>
<span id="L49" class="LineNr">49 </span> <span class="Comment">// hacky? assuming bound is a power of 2</span>
<span id="L50" class="LineNr">50 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>x < -<span class="Constant">1</span>*<span class="Normal">static_cast</span><<span class="Normal">int32_t</span>><span class="Delimiter">(</span>p<span class="Delimiter">-></span>second/<span class="Constant">2</span><span class="Delimiter">))</span>
<span id="L51" class="LineNr">51 </span> <a href='003trace.cc.html#L190'>raise</a> << <span class="Constant">"'"</span> << w<span class="Delimiter">.</span>original << <span class="Constant">"' too large to fit in bitfield "</span> << p<span class="Delimiter">-></span>first << <span class="cSpecial">'\n'</span> << end<span class="Delimiter">();</span>
<span id="L52" class="LineNr">52 </span> <span class="Delimiter">}</span>
<span id="L53" class="LineNr">53 </span> <span class="Delimiter">}</span>
<span id="L54" class="LineNr">54 </span><span class="Delimiter">}</span>
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