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<title>B::Bblock - Walk basic blocks</title>
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<h1><a>B::Bblock - Walk basic blocks</a></h1>
<p><a name="__index__"></a></p>
<!-- INDEX BEGIN -->
<ul>
<li><a href="#name">NAME</a></li>
<li><a href="#synopsis">SYNOPSIS</a></li>
<li><a href="#description">DESCRIPTION</a></li>
<ul>
<li><a href="#functions">Functions</a></li>
</ul>
<li><a href="#author">AUTHOR</a></li>
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<p>
</p>
<h1><a name="name">NAME</a></h1>
<p>B::Bblock - Walk basic blocks</p>
<p>
</p>
<hr />
<h1><a name="synopsis">SYNOPSIS</a></h1>
<pre>
# External interface
perl -MO=Bblock[,OPTIONS] foo.pl</pre>
<pre>
<span class="comment"># Programmatic API</span>
<span class="keyword">use</span> <span class="variable">B::Bblock</span> <span class="string">qw(find_leaders)</span><span class="operator">;</span>
<span class="keyword">my</span> <span class="variable">$leaders</span> <span class="operator">=</span> <span class="variable">find_leaders</span><span class="operator">(</span><span class="variable">$root_op</span><span class="operator">,</span> <span class="variable">$start_op</span><span class="operator">);</span>
</pre>
<p>
</p>
<hr />
<h1><a name="description">DESCRIPTION</a></h1>
<p>This module is used by the B::CC back end. It walks "basic blocks".
A basic block is a series of operations which is known to execute from
start to finish, with no possibility of branching or halting.</p>
<p>It can be used either stand alone or from inside another program.</p>
<p>
</p>
<h2><a name="functions">Functions</a></h2>
<dl>
<dt><strong><a name="item_find_leaders"><strong>find_leaders</strong></a></strong>
<dd>
<pre>
<span class="keyword">my</span> <span class="variable">$leaders</span> <span class="operator">=</span> <span class="variable">find_leaders</span><span class="operator">(</span><span class="variable">$root_op</span><span class="operator">,</span> <span class="variable">$start_op</span><span class="operator">);</span>
</pre>
</dd>
<dd>
<p>Given the root of the op tree and an op from which to start
processing, it will return a hash ref representing all the ops which
start a block.</p>
</dd>
<p>The values of %$leaders are the op objects themselves. Keys are $$op
addresses.</p>
</dl>
<p>
</p>
<hr />
<h1><a name="author">AUTHOR</a></h1>
<p>Malcolm Beattie, <code>mbeattie@sable.ox.ac.uk</code></p>
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