|
|
<!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/032check_operand_bounds.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; }
.Comment { color: #005faf; }
.traceContains { color: #005f00; }
.LineNr { }
.Constant { color: #008787; }
.cSpecial { color: #008000; }
.Delimiter { color: #c000c0; }
.Special { color: #d70000; }
.Identifier { color: #af5f00; }
.Normal { color: #000000; background-color: #c6c6c6; padding-bottom: 1px; }
.PreProc { color: #c000c0; }
.SalientComment { color: #0000af; }
-->
</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/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#L105'>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#L105'>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#L114'>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#L114'>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#L360'>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>
</pre>
</body>
</html>
<!-- vim: set foldmethod=manual : -->
|