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+<a name="Cleanups-1"></a>
+<h4 class="subsection">11.7.6 Cleanups</h4>
+<a name="index-Cleanups"></a>
+
+<p>Destructors for local C++ objects and similar dynamic cleanups are
+represented in GIMPLE by a <code>TRY_FINALLY_EXPR</code>.
+<code>TRY_FINALLY_EXPR</code> has two operands, both of which are a sequence
+of statements to execute.  The first sequence is executed.  When it
+completes the second sequence is executed.
+</p>
+<p>The first sequence may complete in the following ways:
+</p>
+<ol>
+<li> Execute the last statement in the sequence and fall off the
+end.
+
+</li><li> Execute a goto statement (<code>GOTO_EXPR</code>) to an ordinary
+label outside the sequence.
+
+</li><li> Execute a return statement (<code>RETURN_EXPR</code>).
+
+</li><li> Throw an exception.  This is currently not explicitly represented in
+GIMPLE.
+
+</li></ol>
+
+<p>The second sequence is not executed if the first sequence completes by
+calling <code>setjmp</code> or <code>exit</code> or any other function that does
+not return.  The second sequence is also not executed if the first
+sequence completes via a non-local goto or a computed goto (in general
+the compiler does not know whether such a goto statement exits the
+first sequence or not, so we assume that it doesn&rsquo;t).
+</p>
+<p>After the second sequence is executed, if it completes normally by
+falling off the end, execution continues wherever the first sequence
+would have continued, by falling off the end, or doing a goto, etc.
+</p>
+<p>If the second sequence is an <code>EH_ELSE_EXPR</code> selector, then the
+sequence in its first operand is used when the first sequence completes
+normally, and that in its second operand is used for exceptional
+cleanups, i.e., when an exception propagates out of the first sequence.
+</p>
+<p><code>TRY_FINALLY_EXPR</code> complicates the flow graph, since the cleanup
+needs to appear on every edge out of the controlled block; this
+reduces the freedom to move code across these edges.  Therefore, the
+EH lowering pass which runs before most of the optimization passes
+eliminates these expressions by explicitly adding the cleanup to each
+edge.  Rethrowing the exception is represented using <code>RESX_EXPR</code>.
+</p>
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