about summary refs log blame commit diff stats
path: root/html/subx/036global_variables.cc.html
blob: 5d783d169c60f23bd14b16f7bd16800b81717305 (plain) (tree)


















                                                                                                               
                                  


                              
                                   



                                                                           
                            








































                                                                                                                                                  
                                                                                                                                    

                                                                                                  

                                                                                            


                                                                                                                                                                                                                                                                                                
                                                                                                                                    

                                                                                                                    
                                                                                                                                                                                                                                                                    
                                                                               

                                                                                                                                                                                                                                                                                                                                                                                                      

                                                                                                                                                                                           


                                                                                                                                                                                                                                                                            


                                                                                                                                                                                                                                                                                                                                                                                                     

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       



                                                                                                                                                                                                                                                                                                                                                                                                     



                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  



                                                                                                                                                                                                                                                                                                                                    
                                                                                                                                                                                                                          
                                                                                                                                          

                                                                                                                                                                                                                                                                                  
                                                                                                                                                                                      




                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        





                                                                                                                                                                       


                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       

                                                                         







                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            

                                                                                                                                                                                                                                                                                                             

                                                                                                                                                                                                                                                                                                                                                                                                 


                                                                                                                                                                                                                                                 
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 



                                                                                                                                                                                                                                                                                                                                                           

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              


                                                                           
                                                                                                                                                                                                                                                                                                     








                                                                                                                                                                                                                                                                                                                                                                                             
                                                                                                                                                                                                                                                                       
                                                                                






                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             








                                                                                                                                                                                                                                                                                        
                                                                                                                                                                                                                                                                                                     



                                                                                                                                                

                                                                                                                                                                                                                                                                                                                                                                                                              



























                                                                                                                                                                                                                                                                                                                                                                                                        
                                                                                                                                                                                                                           













                                                                                                                                                                                                                                                                                                 
                                                                                                                                                                                                              
                                                                                             
                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
                                                                                                                                                                                                                                                                  


                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            


                                                                                                                                                           



                                     
<!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/036global_variables.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">
<style type="text/css">
<!--
pre { white-space: pre-wrap; font-family: monospace; color: #aaaaaa; background-color: #080808; }
body { font-size: 12pt; font-family: monospace; color: #aaaaaa; background-color: #080808; }
a { color:#eeeeee; text-decoration: none; }
a:hover { text-decoration: underline; }
* { font-size: 12pt; font-size: 1em; }
.cSpecial { color: #008000; }
.traceContains { color: #008000; }
.CommentedCode { color: #6c6c6c; }
.LineNr { color: #444444; }
.Constant { color: #00a0a0; }
.Delimiter { color: #800080; }
.SalientComment { color: #00ffff; }
.Identifier { color: #c0a020; }
.Normal { color: #aaaaaa; background-color: #080808; padding-bottom: 1px; }
.Comment { color: #9090ff; }
.Comment a { color:#0000ee; text-decoration:underline; }
.Special { color: #c00000; }
.PreProc { color: #800080; }
-->
</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();'>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr">  1 </span><span class="Comment">//: Global variables.</span>
<span id="L2" class="LineNr">  2 </span><span class="Comment">//:</span>
<span id="L3" class="LineNr">  3 </span><span class="Comment">//: Global variables are just labels in the data segment.</span>
<span id="L4" class="LineNr">  4 </span><span class="Comment">//: However, they can only be used in imm32 and not disp32 operands. And they</span>
<span id="L5" class="LineNr">  5 </span><span class="Comment">//: can't be used with jump and call instructions.</span>
<span id="L6" class="LineNr">  6 </span><span class="Comment">//:</span>
<span id="L7" class="LineNr">  7 </span><span class="Comment">//: This layer has much the same structure as rewriting labels.</span>
<span id="L8" class="LineNr">  8 </span>
<span id="L9" class="LineNr">  9 </span><span class="Delimiter">:(scenario global_variable)</span>
<span id="L10" class="LineNr"> 10 </span>== <a href='031check_operands.cc.html#L11'>code</a>
<span id="L11" class="LineNr"> 11 </span>b9  x/imm32
<span id="L12" class="LineNr"> 12 </span>== data
<span id="L13" class="LineNr"> 13 </span><span class="Normal">x</span>:
<span id="L14" class="LineNr"> 14 </span><span class="PreProc">0</span><span class="Constant">0</span> <span class="PreProc">0</span><span class="Constant">0</span> <span class="PreProc">0</span><span class="Constant">0</span> <span class="PreProc">0</span><span class="Constant">0</span>
<span id="L15" class="LineNr"> 15 </span><span class="traceContains">+transform: global variable 'x' is at address 0x0a000079</span>
<span id="L16" class="LineNr"> 16 </span>
<span id="L17" class="LineNr"> 17 </span><span class="Delimiter">:(before &quot;End Level-2 Transforms&quot;)</span>
<span id="L18" class="LineNr"> 18 </span><a href='011run.cc.html#L229'>Transform</a><span class="Delimiter">.</span>push_back<span class="Delimiter">(</span><a href='036global_variables.cc.html#L20'>rewrite_global_variables</a><span class="Delimiter">);</span>
<span id="L19" class="LineNr"> 19 </span><span class="Delimiter">:(code)</span>
<span id="L20" class="LineNr"> 20 </span><span class="Normal">void</span> <a href='036global_variables.cc.html#L20'>rewrite_global_variables</a><span class="Delimiter">(</span>program&amp; p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L21" class="LineNr"> 21 </span>  <a href='003trace.cc.html#L203'>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 global variables&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
<span id="L22" class="LineNr"> 22 </span>  map&lt;string<span class="Delimiter">,</span> <span class="Normal">uint32_t</span>&gt; address<span class="Delimiter">;</span>
<span id="L23" class="LineNr"> 23 </span>  compute_addresses_for_global_variables<span class="Delimiter">(</span>p<span class="Delimiter">,</span> address<span class="Delimiter">);</span>
<span id="L24" class="LineNr"> 24 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='003trace.cc.html#L224'>trace_contains_errors</a><span class="Delimiter">())</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
<span id="L25" class="LineNr"> 25 </span>  <a href='036global_variables.cc.html#L60'>drop_global_variables</a><span class="Delimiter">(</span>p<span class="Delimiter">);</span>
<span id="L26" class="LineNr"> 26 </span>  <a href='036global_variables.cc.html#L65'>replace_global_variables_with_addresses</a><span class="Delimiter">(</span>p<span class="Delimiter">,</span> address<span class="Delimiter">);</span>
<span id="L27" class="LineNr"> 27 </span><span class="Delimiter">}</span>
<span id="L28" class="LineNr"> 28 </span>
<span id="L29" class="LineNr"> 29 </span><span class="Normal">void</span> compute_addresses_for_global_variables<span class="Delimiter">(</span><span class="Normal">const</span> program&amp; p<span class="Delimiter">,</span> map&lt;string<span class="Delimiter">,</span> <span class="Normal">uint32_t</span>&gt;&amp; address<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L30" class="LineNr"> 30 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Comment">/*</span><span class="Comment">skip <a href='031check_operands.cc.html#L11'>code</a> segment</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L157'>SIZE</a><span class="Delimiter">(</span>p<span class="Delimiter">.</span><a href='011run.cc.html#L100'>segments</a><span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span>
<span id="L31" class="LineNr"> 31 </span>    compute_addresses_for_global_variables<span class="Delimiter">(</span>p<span class="Delimiter">.</span><a href='011run.cc.html#L100'>segments</a><span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> address<span class="Delimiter">);</span>
<span id="L32" class="LineNr"> 32 </span><span class="Delimiter">}</span>
<span id="L33" class="LineNr"> 33 </span>
<span id="L34" class="LineNr"> 34 </span><span class="Normal">void</span> compute_addresses_for_global_variables<span class="Delimiter">(</span><span class="Normal">const</span> segment&amp; s<span class="Delimiter">,</span> map&lt;string<span class="Delimiter">,</span> <span class="Normal">uint32_t</span>&gt;&amp; address<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L35" class="LineNr"> 35 </span>  <span class="Normal">int</span> current_address = s<span class="Delimiter">.</span>start<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#L157'>SIZE</a><span class="Delimiter">(</span>s<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="L37" class="LineNr"> 37 </span>    <span class="Normal">const</span> line&amp; inst = s<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="L38" class="LineNr"> 38 </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#L157'>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 class="Delimiter">{</span>
<span id="L39" class="LineNr"> 39 </span>      <span class="Normal">const</span> word&amp; curr = 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="L40" class="LineNr"> 40 </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="L41" class="LineNr"> 41 </span>        ++current_address<span class="Delimiter">;</span>
<span id="L42" class="LineNr"> 42 </span>      <span class="Delimiter">}</span>
<span id="L43" class="LineNr"> 43 </span>      <span class="Normal">else</span> <span class="Delimiter">{</span>
<span id="L44" class="LineNr"> 44 </span>        string variable = <a href='035labels.cc.html#L204'>drop_last</a><span class="Delimiter">(</span>curr<span class="Delimiter">.</span>data<span class="Delimiter">);</span>
<span id="L45" class="LineNr"> 45 </span>        <span class="Comment">// ensure variables look sufficiently different from raw hex</span>
<span id="L46" class="LineNr"> 46 </span>        <a href='035labels.cc.html#L52'>check_valid_name</a><span class="Delimiter">(</span>variable<span class="Delimiter">);</span>
<span id="L47" class="LineNr"> 47 </span>        <span class="Normal">if</span> <span class="Delimiter">(</span><a href='003trace.cc.html#L224'>trace_contains_errors</a><span class="Delimiter">())</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
<span id="L48" class="LineNr"> 48 </span>        <span class="Normal">if</span> <span class="Delimiter">(</span>j &gt; <span class="Constant">0</span><span class="Delimiter">)</span>
<span id="L49" class="LineNr"> 49 </span>          <a href='003trace.cc.html#L210'>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;': global variable names can only be the first <a href='011run.cc.html#L123'>word</a> in a line.</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
<span id="L50" class="LineNr"> 50 </span>        <span class="Normal">if</span> <span class="Delimiter">(</span><a href='035labels.cc.html#L133'>Map_file</a><span class="Delimiter">.</span>is_open<span class="Delimiter">())</span>
<span id="L51" class="LineNr"> 51 </span>          <a href='035labels.cc.html#L133'>Map_file</a> &lt;&lt; <span class="Constant">&quot;0x&quot;</span> &lt;&lt; <a href='010---vm.cc.html#L404'>HEXWORD</a> &lt;&lt; current_address &lt;&lt; <span class="Constant">' '</span> &lt;&lt; variable &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
<span id="L52" class="LineNr"> 52 </span>        <a href='001help.cc.html#L243'>put</a><span class="Delimiter">(</span>address<span class="Delimiter">,</span> variable<span class="Delimiter">,</span> current_address<span class="Delimiter">);</span>
<span id="L53" class="LineNr"> 53 </span>        <a href='003trace.cc.html#L203'>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;global variable '&quot;</span> &lt;&lt; variable &lt;&lt; <span class="Constant">&quot;' is at address 0x&quot;</span> &lt;&lt; <a href='010---vm.cc.html#L404'>HEXWORD</a> &lt;&lt; current_address &lt;&lt; end<span class="Delimiter">();</span>
<span id="L54" class="LineNr"> 54 </span>        <span class="Comment">// no modifying current_address; global variable definitions won't be in the final binary</span>
<span id="L55" class="LineNr"> 55 </span>      <span class="Delimiter">}</span>
<span id="L56" class="LineNr"> 56 </span>    <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 id="L60" class="LineNr"> 60 </span><span class="Normal">void</span> <a href='036global_variables.cc.html#L60'>drop_global_variables</a><span class="Delimiter">(</span>program&amp; p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L61" class="LineNr"> 61 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Comment">/*</span><span class="Comment">skip <a href='031check_operands.cc.html#L11'>code</a> segment</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L157'>SIZE</a><span class="Delimiter">(</span>p<span class="Delimiter">.</span><a href='011run.cc.html#L100'>segments</a><span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span>
<span id="L62" class="LineNr"> 62 </span>    <a href='035labels.cc.html#L148'>drop_labels</a><span class="Delimiter">(</span>p<span class="Delimiter">.</span><a href='011run.cc.html#L100'>segments</a><span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
<span id="L63" class="LineNr"> 63 </span><span class="Delimiter">}</span>
<span id="L64" class="LineNr"> 64 </span>
<span id="L65" class="LineNr"> 65 </span><span class="Normal">void</span> <a href='036global_variables.cc.html#L65'>replace_global_variables_with_addresses</a><span class="Delimiter">(</span>program&amp; p<span class="Delimiter">,</span> <span class="Normal">const</span> map&lt;string<span class="Delimiter">,</span> <span class="Normal">uint32_t</span>&gt;&amp; address<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L66" class="LineNr"> 66 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>p<span class="Delimiter">.</span><a href='011run.cc.html#L100'>segments</a><span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
<span id="L67" class="LineNr"> 67 </span>  segment&amp; <a href='031check_operands.cc.html#L11'>code</a> = p<span class="Delimiter">.</span><a href='011run.cc.html#L100'>segments</a><span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
<span id="L68" class="LineNr"> 68 </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#L157'>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="L69" class="LineNr"> 69 </span>    line&amp; 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="L70" class="LineNr"> 70 </span>    <a href='011run.cc.html#L117'>line</a> new_inst<span class="Delimiter">;</span>
<span id="L71" class="LineNr"> 71 </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#L157'>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 class="Delimiter">{</span>
<span id="L72" class="LineNr"> 72 </span>      <span class="Normal">const</span> word&amp; curr = 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="L73" class="LineNr"> 73 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>address<span class="Delimiter">,</span> curr<span class="Delimiter">.</span>data<span class="Delimiter">))</span> <span class="Delimiter">{</span>
<span id="L74" class="LineNr"> 74 </span>        <span class="Normal">if</span> <span class="Delimiter">(</span>!looks_like_hex_int<span class="Delimiter">(</span>curr<span class="Delimiter">.</span>data<span class="Delimiter">))</span>
<span id="L75" class="LineNr"> 75 </span>          <a href='003trace.cc.html#L210'>raise</a> &lt;&lt; <span class="Constant">&quot;missing reference to global '&quot;</span> &lt;&lt; curr<span class="Delimiter">.</span>data &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
<span id="L76" class="LineNr"> 76 </span>        new_inst<span class="Delimiter">.</span><a href='011run.cc.html#L118'>words</a><span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>curr<span class="Delimiter">);</span>
<span id="L77" class="LineNr"> 77 </span>        <span class="Identifier">continue</span><span class="Delimiter">;</span>
<span id="L78" class="LineNr"> 78 </span>      <span class="Delimiter">}</span>
<span id="L79" class="LineNr"> 79 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>!valid_use_of_global_variable<span class="Delimiter">(</span>curr<span class="Delimiter">))</span> <span class="Delimiter">{</span>
<span id="L80" class="LineNr"> 80 </span>        <a href='003trace.cc.html#L210'>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;': can't refer to global variable '&quot;</span> &lt;&lt; curr<span class="Delimiter">.</span>data &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
<span id="L81" class="LineNr"> 81 </span>        <span class="Identifier">return</span><span class="Delimiter">;</span>
<span id="L82" class="LineNr"> 82 </span>      <span class="Delimiter">}</span>
<span id="L83" class="LineNr"> 83 </span>      emit_hex_bytes<span class="Delimiter">(</span>new_inst<span class="Delimiter">,</span> get<span class="Delimiter">(</span>address<span class="Delimiter">,</span> curr<span class="Delimiter">.</span>data<span class="Delimiter">),</span> <span class="Constant">4</span><span class="Delimiter">);</span>
<span id="L84" class="LineNr"> 84 </span>    <span class="Delimiter">}</span>
<span id="L85" class="LineNr"> 85 </span>    inst<span class="Delimiter">.</span><a href='011run.cc.html#L118'>words</a><span class="Delimiter">.</span>swap<span class="Delimiter">(</span>new_inst<span class="Delimiter">.</span><a href='011run.cc.html#L118'>words</a><span class="Delimiter">);</span>
<span id="L86" class="LineNr"> 86 </span>    <a href='003trace.cc.html#L203'>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#L231'>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="L87" class="LineNr"> 87 </span>  <span class="Delimiter">}</span>
<span id="L88" class="LineNr"> 88 </span><span class="Delimiter">}</span>
<span id="L89" class="LineNr"> 89 </span>
<span id="L90" class="LineNr"> 90 </span><span class="Normal">bool</span> <a href='036global_variables.cc.html#L90'>valid_use_of_global_variable</a><span class="Delimiter">(</span><span class="Normal">const</span> word&amp; curr<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L91" class="LineNr"> 91 </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;imm32&quot;</span><span class="Delimiter">))</span> <span class="Identifier">return</span><span class="Constant"> true</span><span class="Delimiter">;</span>
<span id="L92" class="LineNr"> 92 </span>  <span class="Comment">// End Valid Uses Of Global Variable(curr)</span>
<span id="L93" class="LineNr"> 93 </span>  <span class="Identifier">return</span><span class="Constant"> false</span><span class="Delimiter">;</span>
<span id="L94" class="LineNr"> 94 </span><span class="Delimiter">}</span>
<span id="L95" class="LineNr"> 95 </span>
<span id="L96" class="LineNr"> 96 </span><span class="SalientComment">//:: a more complex sanity check for how we use global variables</span>
<span id="L97" class="LineNr"> 97 </span><span class="Comment">//: requires first saving some data early before we pack operands</span>
<span id="L98" class="LineNr"> 98 </span>
<span id="L99" class="LineNr"> 99 </span><span class="Delimiter">:(after &quot;Begin Level-2 Transforms&quot;)</span>
<span id="L100" class="LineNr">100 </span><a href='011run.cc.html#L229'>Transform</a><span class="Delimiter">.</span>push_back<span class="Delimiter">(</span><a href='036global_variables.cc.html#L102'>correlate_disp32_with_mod</a><span class="Delimiter">);</span>
<span id="L101" class="LineNr">101 </span><span class="Delimiter">:(code)</span>
<span id="L102" class="LineNr">102 </span><span class="Normal">void</span> <a href='036global_variables.cc.html#L102'>correlate_disp32_with_mod</a><span class="Delimiter">(</span>program&amp; p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L103" class="LineNr">103 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>p<span class="Delimiter">.</span><a href='011run.cc.html#L100'>segments</a><span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
<span id="L104" class="LineNr">104 </span>  segment&amp; <a href='031check_operands.cc.html#L11'>code</a> = p<span class="Delimiter">.</span><a href='011run.cc.html#L100'>segments</a><span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
<span id="L105" class="LineNr">105 </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#L157'>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="L106" class="LineNr">106 </span>    line&amp; 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="L107" class="LineNr">107 </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#L157'>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 class="Delimiter">{</span>
<span id="L108" class="LineNr">108 </span>      word&amp; curr = 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="L109" class="LineNr">109 </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 id="L110" class="LineNr">110 </span>          &amp;&amp; has_operand_metadata<span class="Delimiter">(</span>inst<span class="Delimiter">,</span> <span class="Constant">&quot;mod&quot;</span><span class="Delimiter">))</span>
<span id="L111" class="LineNr">111 </span>        curr<span class="Delimiter">.</span>metadata<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span><span class="Constant">&quot;has_mod&quot;</span><span class="Delimiter">);</span>
<span id="L112" class="LineNr">112 </span>    <span class="Delimiter">}</span>
<span id="L113" class="LineNr">113 </span>  <span class="Delimiter">}</span>
<span id="L114" class="LineNr">114 </span><span class="Delimiter">}</span>
<span id="L115" class="LineNr">115 </span>
<span id="L116" class="LineNr">116 </span><span class="Delimiter">:(before &quot;End Valid Uses Of Global Variable(curr)&quot;)</span>
<span id="L117" class="LineNr">117 </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 id="L118" class="LineNr">118 </span>  <span class="Identifier">return</span> <a href='036global_variables.cc.html#L123'>has_metadata</a><span class="Delimiter">(</span>curr<span class="Delimiter">,</span> <span class="Constant">&quot;has_mod&quot;</span><span class="Delimiter">);</span>
<span id="L119" class="LineNr">119 </span><span class="Comment">// todo: more sophisticated check, to ensure we don't use global variable</span>
<span id="L120" class="LineNr">120 </span><span class="Comment">// addresses as a real displacement added to other operands.</span>
<span id="L121" class="LineNr">121 </span>
<span id="L122" class="LineNr">122 </span><span class="Delimiter">:(code)</span>
<span id="L123" class="LineNr">123 </span><span class="Normal">bool</span> <a href='036global_variables.cc.html#L123'>has_metadata</a><span class="Delimiter">(</span><span class="Normal">const</span> word&amp; w<span class="Delimiter">,</span> <span class="Normal">const</span> string&amp; m<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L124" class="LineNr">124 </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#L157'>SIZE</a><span class="Delimiter">(</span>w<span class="Delimiter">.</span>metadata<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span>
<span id="L125" class="LineNr">125 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>w<span class="Delimiter">.</span>metadata<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)</span> == m<span class="Delimiter">)</span> <span class="Identifier">return</span><span class="Constant"> true</span><span class="Delimiter">;</span>
<span id="L126" class="LineNr">126 </span>  <span class="Identifier">return</span><span class="Constant"> false</span><span class="Delimiter">;</span>
<span id="L127" class="LineNr">127 </span><span class="Delimiter">}</span>
<span id="L128" class="LineNr">128 </span>
<span id="L129" class="LineNr">129 </span><span class="Delimiter">:(scenario global_variable_disallowed_in_jump)</span>
<span id="L130" class="LineNr">130 </span><span class="Special">% Hide_errors = true;</span>
<span id="L131" class="LineNr">131 </span>== <a href='031check_operands.cc.html#L11'>code</a>
<span id="L132" class="LineNr">132 </span>eb/jump  x/disp8
<span id="L133" class="LineNr">133 </span>== data
<span id="L134" class="LineNr">134 </span><span class="Normal">x</span>:
<span id="L135" class="LineNr">135 </span><span class="PreProc">0</span><span class="Constant">0</span> <span class="PreProc">0</span><span class="Constant">0</span> <span class="PreProc">0</span><span class="Constant">0</span> <span class="PreProc">0</span><span class="Constant">0</span>
<span id="L136" class="LineNr">136 </span><span class="traceContains">+error: 'eb/jump x/disp8': can't refer to global variable 'x'</span>
<span id="L137" class="LineNr">137 </span><span class="Comment"># sub-optimal error message; should be</span>
<span id="L138" class="LineNr">138 </span><span class="CommentedCode">#? +error: can't jump to data (variable 'x')</span>
<span id="L139" class="LineNr">139 </span>
<span id="L140" class="LineNr">140 </span><span class="Delimiter">:(scenario global_variable_disallowed_in_call)</span>
<span id="L141" class="LineNr">141 </span><span class="Special">% Hide_errors = true;</span>
<span id="L142" class="LineNr">142 </span>== <a href='031check_operands.cc.html#L11'>code</a>
<span id="L143" class="LineNr">143 </span>e8/call  x/disp32
<span id="L144" class="LineNr">144 </span>== data
<span id="L145" class="LineNr">145 </span><span class="Normal">x</span>:
<span id="L146" class="LineNr">146 </span><span class="PreProc">0</span><span class="Constant">0</span> <span class="PreProc">0</span><span class="Constant">0</span> <span class="PreProc">0</span><span class="Constant">0</span> <span class="PreProc">0</span><span class="Constant">0</span>
<span id="L147" class="LineNr">147 </span><span class="traceContains">+error: 'e8/call x/disp32': can't refer to global variable 'x'</span>
<span id="L148" class="LineNr">148 </span><span class="Comment"># sub-optimal error message; should be</span>
<span id="L149" class="LineNr">149 </span><span class="CommentedCode">#? +error: can't call to the data segment ('x')</span>
<span id="L150" class="LineNr">150 </span>
<span id="L151" class="LineNr">151 </span><span class="Delimiter">:(scenario disp32_data_with_modrm)</span>
<span id="L152" class="LineNr">152 </span>== <a href='031check_operands.cc.html#L11'>code</a>
<span id="L153" class="LineNr">153 </span>8b/copy <span class="Constant">0</span>/mod/indirect <span class="Constant">5</span>/rm32/<span class="Delimiter">.</span>disp32 <span class="Constant">2</span>/r32/EDX x/disp32
<span id="L154" class="LineNr">154 </span>== data
<span id="L155" class="LineNr">155 </span><span class="Normal">x</span>:
<span id="L156" class="LineNr">156 </span><span class="PreProc">0</span><span class="Constant">0</span> <span class="PreProc">0</span><span class="Constant">0</span> <span class="PreProc">0</span><span class="Constant">0</span> <span class="PreProc">0</span><span class="Constant">0</span>
<span id="L157" class="LineNr">157 </span>$error: <span class="Constant">0</span>
<span id="L158" class="LineNr">158 </span>
<span id="L159" class="LineNr">159 </span><span class="Delimiter">:(scenarios transform)</span>
<span id="L160" class="LineNr">160 </span><span class="Delimiter">:(scenario disp32_data_with_call)</span>
<span id="L161" class="LineNr">161 </span>== <a href='031check_operands.cc.html#L11'>code</a>
<span id="L162" class="LineNr">162 </span><span class="Normal">foo</span>:
<span id="L163" class="LineNr">163 </span>e8/call bar/disp32
<span id="L164" class="LineNr">164 </span><span class="Normal">bar</span>:
<span id="L165" class="LineNr">165 </span>$error: <span class="Constant">0</span>
<span id="L166" class="LineNr">166 </span>
<span id="L167" class="LineNr">167 </span><span class="Delimiter">:(code)</span>
<span id="L168" class="LineNr">168 </span>string to_full_string<span class="Delimiter">(</span><span class="Normal">const</span> line&amp; in<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L169" class="LineNr">169 </span>  ostringstream out<span class="Delimiter">;</span>
<span id="L170" class="LineNr">170 </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#L157'>SIZE</a><span class="Delimiter">(</span>in<span class="Delimiter">.</span><a href='011run.cc.html#L118'>words</a><span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L171" class="LineNr">171 </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="L172" class="LineNr">172 </span>    out &lt;&lt; in<span class="Delimiter">.</span><a href='011run.cc.html#L118'>words</a><span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>data<span class="Delimiter">;</span>
<span id="L173" class="LineNr">173 </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#L157'>SIZE</a><span class="Delimiter">(</span>in<span class="Delimiter">.</span><a href='011run.cc.html#L118'>words</a><span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>metadata<span class="Delimiter">);</span>  ++j<span class="Delimiter">)</span>
<span id="L174" class="LineNr">174 </span>      out &lt;&lt; <span class="Constant">'/'</span> &lt;&lt; in<span class="Delimiter">.</span><a href='011run.cc.html#L118'>words</a><span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>metadata<span class="Delimiter">.</span>at<span class="Delimiter">(</span>j<span class="Delimiter">);</span>
<span id="L175" class="LineNr">175 </span>  <span class="Delimiter">}</span>
<span id="L176" class="LineNr">176 </span>  <span class="Identifier">return</span> out<span class="Delimiter">.</span>str<span class="Delimiter">();</span>
<span id="L177" class="LineNr">177 </span><span class="Delimiter">}</span>
</pre>
</body>
</html>
<!-- vim: set foldmethod=manual : -->