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<link title="Dominators" rel="Chapter" href="Dominators.html"><title>CIL API Documentation (version 1.3.5) : Dataflow.BackwardsTransfer</title>
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<center><h1>Module type <a href="type_Dataflow.BackwardsTransfer.html">Dataflow.BackwardsTransfer</a></h1></center>
<br>
<pre><span class="keyword">module type</span> BackwardsTransfer = <code class="code">sig</code> <a href="Dataflow.BackwardsTransfer.html">..</a> <code class="code">end</code></pre><hr width="100%">
<pre><span class="keyword">val</span> <a name="VALname"></a>name : <code class="type">string</code></pre><div class="info">
For debugging purposes, the name of the analysis<br>
</div>
<pre><span class="keyword">val</span> <a name="VALdebug"></a>debug : <code class="type">bool Pervasives.ref</code></pre><div class="info">
Whether to turn on debugging<br>
</div>
<pre><span class="keyword">type</span> <a name="TYPEt"></a><code class="type"></code>t </pre>
<div class="info">
The type of the data we compute for each block start. In many
presentations of backwards data flow analysis we maintain the
data at the block end. This is not easy to do with JVML because
a block has many exceptional ends. So we maintain the data for
the statement start.<br>
</div>
<pre><span class="keyword">val</span> <a name="VALpretty"></a>pretty : <code class="type">unit -> <a href="Dataflow.BackwardsTransfer.html#TYPEt">t</a> -> <a href="Pretty.html#TYPEdoc">Pretty.doc</a></code></pre><div class="info">
Pretty-print the state<br>
</div>
<pre><span class="keyword">val</span> <a name="VALstmtStartData"></a>stmtStartData : <code class="type"><a href="Dataflow.BackwardsTransfer.html#TYPEt">t</a> Inthash.t</code></pre><div class="info">
For each block id, the data at the start. This data structure must be
initialized with the initial data for each block<br>
</div>
<pre><span class="keyword">val</span> <a name="VALcombineStmtStartData"></a>combineStmtStartData : <code class="type"><a href="Cil.html#TYPEstmt">Cil.stmt</a> -><br> old:<a href="Dataflow.BackwardsTransfer.html#TYPEt">t</a> -><br> <a href="Dataflow.BackwardsTransfer.html#TYPEt">t</a> -> <a href="Dataflow.BackwardsTransfer.html#TYPEt">t</a> option</code></pre><div class="info">
When the analysis reaches the start of a block, combine the old data
with the one we have just computed. Return None if the combination is
the same as the old data, otherwise return the combination. In the
latter case, the predecessors of the statement are put on the working
list.<br>
</div>
<pre><span class="keyword">val</span> <a name="VALcombineSuccessors"></a>combineSuccessors : <code class="type"><a href="Dataflow.BackwardsTransfer.html#TYPEt">t</a> -><br> <a href="Dataflow.BackwardsTransfer.html#TYPEt">t</a> -> <a href="Dataflow.BackwardsTransfer.html#TYPEt">t</a></code></pre><div class="info">
Take the data from two successors and combine it<br>
</div>
<pre><span class="keyword">val</span> <a name="VALdoStmt"></a>doStmt : <code class="type"><a href="Cil.html#TYPEstmt">Cil.stmt</a> -> <a href="Dataflow.BackwardsTransfer.html#TYPEt">t</a> <a href="Dataflow.html#TYPEaction">Dataflow.action</a></code></pre><div class="info">
The (backwards) transfer function for a branch. The <a href="Cil.html#VALcurrentLoc"><code class="code">Cil.currentLoc</code></a> is
set before calling this. If it returns None, then we have some default
handling. Otherwise, the returned data is the data before the branch
(not considering the exception handlers)<br>
</div>
<pre><span class="keyword">val</span> <a name="VALdoInstr"></a>doInstr : <code class="type"><a href="Cil.html#TYPEinstr">Cil.instr</a> -><br> <a href="Dataflow.BackwardsTransfer.html#TYPEt">t</a> -> <a href="Dataflow.BackwardsTransfer.html#TYPEt">t</a> <a href="Dataflow.html#TYPEaction">Dataflow.action</a></code></pre><div class="info">
The (backwards) transfer function for an instruction. The
<a href="Cil.html#VALcurrentLoc"><code class="code">Cil.currentLoc</code></a> is set before calling this. If it returns None, then we
have some default handling. Otherwise, the returned data is the data
before the branch (not considering the exception handlers)<br>
</div>
<pre><span class="keyword">val</span> <a name="VALfilterStmt"></a>filterStmt : <code class="type"><a href="Cil.html#TYPEstmt">Cil.stmt</a> -> <a href="Cil.html#TYPEstmt">Cil.stmt</a> -> bool</code></pre><div class="info">
Whether to put this predecessor block in the worklist. We give the
predecessor and the block whose predecessor we are (and whose data has
changed)<br>
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