mingw/html/ext/B/B/Bblock.html

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   5 <title>B::Bblock - Walk basic blocks</title>
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  13 <big><strong><span class="block">&nbsp;B::Bblock - Walk basic blocks</span></strong></big>
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  17 <p><a name="__index__"></a></p>
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  19
  20 <ul>
  21
  22         <li><a href="#name">NAME</a></li>
  23         <li><a href="#synopsis">SYNOPSIS</a></li>
  24         <li><a href="#description">DESCRIPTION</a></li>
  25         <ul>
  26
  27                 <li><a href="#functions">Functions</a></li>
  28         </ul>
  29
  30         <li><a href="#author">AUTHOR</a></li>
  31 </ul>
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  35 <p>
  36 </p>
  37 <h1><a name="name">NAME</a></h1>
  38 <p>B::Bblock - Walk basic blocks</p>
  39 <p>
  40 </p>
  41 <hr />
  42 <h1><a name="synopsis">SYNOPSIS</a></h1>
  43 <pre>
  44   # External interface
  45   perl -MO=Bblock[,OPTIONS] foo.pl</pre>
  46 <pre>
  47   # Programmatic API
  48   use B::Bblock qw(find_leaders);
  49   my $leaders = find_leaders($root_op, $start_op);</pre>
  50 <p>
  51 </p>
  52 <hr />
  53 <h1><a name="description">DESCRIPTION</a></h1>
  54 <p>This module is used by the B::CC back end.  It walks ``basic blocks''.
  55 A basic block is a series of operations which is known to execute from
  56 start to finish, with no possibility of branching or halting.</p>
  57 <p>It can be used either stand alone or from inside another program.</p>
  58 <p>
  59 </p>
  60 <h2><a name="functions">Functions</a></h2>
  61 <dl>
  62 <dt><strong><a name="item_find_leaders"><strong>find_leaders</strong></a></strong>
  63
  64 <dd>
  65 <pre>
  66   my $leaders = find_leaders($root_op, $start_op);</pre>
  67 </dd>
  68 <dd>
  69 <p>Given the root of the op tree and an op from which to start
  70 processing, it will return a hash ref representing all the ops which
  71 start a block.</p>
  72 </dd>
  73 <p>The values of %$leaders are the op objects themselves.  Keys are $$op
  74 addresses.</p>
  75 </dl>
  76 <p>
  77 </p>
  78 <hr />
  79 <h1><a name="author">AUTHOR</a></h1>
  80 <p>Malcolm Beattie, <code>mbeattie@sable.ox.ac.uk</code></p>
  81 <table border="0" width="100%" cellspacing="0" cellpadding="3">
  82 <tr><td class="block" style="background-color: #cccccc" valign="middle">
  83 <big><strong><span class="block">&nbsp;B::Bblock - Walk basic blocks</span></strong></big>
  84 </td></tr>
  85 </table>
  86
  87 </body>
  88
  89 </html>