</p>
<p>
-The <tt>AliasAnalysis</tt> interface exposes three methods which are used to
+The <tt>AliasAnalysis</tt> interface exposes four methods which are used to
communicate program changes from the clients to the analysis implementations.
Various alias analysis implementations should use these methods to ensure that
their internal data structures are kept up-to-date as the program changes (for
analysis implementations.
</div>
+<!-- _______________________________________________________________________ -->
+<div class="doc_subsubsection">The <tt>addEscapingUse</tt> method</div>
+
+<div class="doc_text">
+<p>The <tt>addEscapingUse</tt> method is used when the uses of a pointer
+value have changed in ways that may invalidate precomputed analysis information.
+Implementations may either use this callback to provide conservative responses
+for points whose uses have change since analysis time, or may recompute some
+or all of their internal state to continue providing accurate responses.</p>
+
+<p>In general, any new use of a pointer value is considered an escaping use,
+and must be reported through this callback, <em>except</em> for the
+uses below:</p>
+
+<ul>
+ <li>A <tt>bitcast</tt> or <tt>getelementptr</tt> of the pointer</li>
+ <li>A <tt>store</tt> through the pointer (but not a <tt>store</tt>
+ <em>of</em> the pointer)</li>
+ <li>A <tt>load</tt> through the pointer</li>
+</ul>
+</div>
+
<!-- ======================================================================= -->
<div class="doc_subsection">
<a name="implefficiency">Efficiency Issues</a>
however there's no way for a pass to declare in its
<tt>getAnalysisUsage</tt> that it does so. Some passes attempt to use
<tt>AU.addPreserved<AliasAnalysis></tt>, however this doesn't
-actually have any effect.</tt>
+actually have any effect.</p>
<p><tt>AliasAnalysisCounter</tt> (<tt>-count-aa</tt>) and <tt>AliasDebugger</tt>
(<tt>-debug-aa</tt>) are implemented as <tt>ModulePass</tt> classes, so if your
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<a href="mailto:sabre@nondot.org">Chris Lattner</a><br>
- <a href="http://llvm.org">LLVM Compiler Infrastructure</a><br>
+ <a href="http://llvm.org/">LLVM Compiler Infrastructure</a><br>
Last modified: $Date$
</address>