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<h3 class="section">11.9 GIMPLE sequences</h3>
<p><a name="index-GIMPLE-sequences-2449"></a>
GIMPLE sequences are the tuple equivalent of <code>STATEMENT_LIST</code>'s
used in <code>GENERIC</code>. They are used to chain statements together, and
when used in conjunction with sequence iterators, provide a
framework for iterating through statements.
<p>GIMPLE sequences are of type struct <code>gimple_sequence</code>, but are more
commonly passed by reference to functions dealing with sequences.
The type for a sequence pointer is <code>gimple_seq</code> which is the same
as struct <code>gimple_sequence</code> *. When declaring a local sequence,
you can define a local variable of type struct <code>gimple_sequence</code>.
When declaring a sequence allocated on the garbage collected
heap, use the function <code>gimple_seq_alloc</code> documented below.
<p>There are convenience functions for iterating through sequences
in the section entitled Sequence Iterators.
<p>Below is a list of functions to manipulate and query sequences.
<div class="defun">
— GIMPLE function: void <b>gimple_seq_add_stmt</b> (<var>gimple_seq *seq, gimple g</var>)<var><a name="index-gimple_005fseq_005fadd_005fstmt-2450"></a></var><br>
<blockquote><p>Link a gimple statement to the end of the sequence *<code>SEQ</code> if <code>G</code> is
not <code>NULL</code>. If *<code>SEQ</code> is <code>NULL</code>, allocate a sequence before linking.
</p></blockquote></div>
<div class="defun">
— GIMPLE function: void <b>gimple_seq_add_seq</b> (<var>gimple_seq *dest, gimple_seq src</var>)<var><a name="index-gimple_005fseq_005fadd_005fseq-2451"></a></var><br>
<blockquote><p>Append sequence <code>SRC</code> to the end of sequence *<code>DEST</code> if <code>SRC</code> is not
<code>NULL</code>. If *<code>DEST</code> is <code>NULL</code>, allocate a new sequence before
appending.
</p></blockquote></div>
<div class="defun">
— GIMPLE function: gimple_seq <b>gimple_seq_deep_copy</b> (<var>gimple_seq src</var>)<var><a name="index-gimple_005fseq_005fdeep_005fcopy-2452"></a></var><br>
<blockquote><p>Perform a deep copy of sequence <code>SRC</code> and return the result.
</p></blockquote></div>
<div class="defun">
— GIMPLE function: gimple_seq <b>gimple_seq_reverse</b> (<var>gimple_seq seq</var>)<var><a name="index-gimple_005fseq_005freverse-2453"></a></var><br>
<blockquote><p>Reverse the order of the statements in the sequence <code>SEQ</code>. Return
<code>SEQ</code>.
</p></blockquote></div>
<div class="defun">
— GIMPLE function: gimple <b>gimple_seq_first</b> (<var>gimple_seq s</var>)<var><a name="index-gimple_005fseq_005ffirst-2454"></a></var><br>
<blockquote><p>Return the first statement in sequence <code>S</code>.
</p></blockquote></div>
<div class="defun">
— GIMPLE function: gimple <b>gimple_seq_last</b> (<var>gimple_seq s</var>)<var><a name="index-gimple_005fseq_005flast-2455"></a></var><br>
<blockquote><p>Return the last statement in sequence <code>S</code>.
</p></blockquote></div>
<div class="defun">
— GIMPLE function: void <b>gimple_seq_set_last</b> (<var>gimple_seq s, gimple last</var>)<var><a name="index-gimple_005fseq_005fset_005flast-2456"></a></var><br>
<blockquote><p>Set the last statement in sequence <code>S</code> to the statement in <code>LAST</code>.
</p></blockquote></div>
<div class="defun">
— GIMPLE function: void <b>gimple_seq_set_first</b> (<var>gimple_seq s, gimple first</var>)<var><a name="index-gimple_005fseq_005fset_005ffirst-2457"></a></var><br>
<blockquote><p>Set the first statement in sequence <code>S</code> to the statement in <code>FIRST</code>.
</p></blockquote></div>
<div class="defun">
— GIMPLE function: void <b>gimple_seq_init</b> (<var>gimple_seq s</var>)<var><a name="index-gimple_005fseq_005finit-2458"></a></var><br>
<blockquote><p>Initialize sequence <code>S</code> to an empty sequence.
</p></blockquote></div>
<div class="defun">
— GIMPLE function: gimple_seq <b>gimple_seq_alloc</b> (<var>void</var>)<var><a name="index-gimple_005fseq_005falloc-2459"></a></var><br>
<blockquote><p>Allocate a new sequence in the garbage collected store and return
it.
</p></blockquote></div>
<div class="defun">
— GIMPLE function: void <b>gimple_seq_copy</b> (<var>gimple_seq dest, gimple_seq src</var>)<var><a name="index-gimple_005fseq_005fcopy-2460"></a></var><br>
<blockquote><p>Copy the sequence <code>SRC</code> into the sequence <code>DEST</code>.
</p></blockquote></div>
<div class="defun">
— GIMPLE function: bool <b>gimple_seq_empty_p</b> (<var>gimple_seq s</var>)<var><a name="index-gimple_005fseq_005fempty_005fp-2461"></a></var><br>
<blockquote><p>Return true if the sequence <code>S</code> is empty.
</p></blockquote></div>
<div class="defun">
— GIMPLE function: gimple_seq <b>bb_seq</b> (<var>basic_block bb</var>)<var><a name="index-bb_005fseq-2462"></a></var><br>
<blockquote><p>Returns the sequence of statements in <code>BB</code>.
</p></blockquote></div>
<div class="defun">
— GIMPLE function: void <b>set_bb_seq</b> (<var>basic_block bb, gimple_seq seq</var>)<var><a name="index-set_005fbb_005fseq-2463"></a></var><br>
<blockquote><p>Sets the sequence of statements in <code>BB</code> to <code>SEQ</code>.
</p></blockquote></div>
<div class="defun">
— GIMPLE function: bool <b>gimple_seq_singleton_p</b> (<var>gimple_seq seq</var>)<var><a name="index-gimple_005fseq_005fsingleton_005fp-2464"></a></var><br>
<blockquote><p>Determine whether <code>SEQ</code> contains exactly one statement.
</p></blockquote></div>
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