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<title>GNU Compiler Collection (GCC) Internals: GIMPLE sequences</title>
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<a name="GIMPLE-sequences"></a>
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<div class="header">
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<p>
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Next: <a href="Sequence-iterators.html#Sequence-iterators" accesskey="n" rel="next">Sequence iterators</a>, Previous: <a href="Tuple-specific-accessors.html#Tuple-specific-accessors" accesskey="p" rel="prev">Tuple specific accessors</a>, Up: <a href="GIMPLE.html#GIMPLE" accesskey="u" rel="up">GIMPLE</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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<hr>
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<a name="GIMPLE-sequences-1"></a>
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<h3 class="section">11.9 GIMPLE sequences</h3>
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<a name="index-GIMPLE-sequences"></a>
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<p>GIMPLE sequences are the tuple equivalent of <code>STATEMENT_LIST</code>’s
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used in <code>GENERIC</code>. They are used to chain statements together, and
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when used in conjunction with sequence iterators, provide a
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framework for iterating through statements.
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</p>
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<p>GIMPLE sequences are of type struct <code>gimple_sequence</code>, but are more
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commonly passed by reference to functions dealing with sequences.
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The type for a sequence pointer is <code>gimple_seq</code> which is the same
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as struct <code>gimple_sequence</code> *. When declaring a local sequence,
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you can define a local variable of type struct <code>gimple_sequence</code>.
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When declaring a sequence allocated on the garbage collected
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heap, use the function <code>gimple_seq_alloc</code> documented below.
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</p>
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<p>There are convenience functions for iterating through sequences
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in the section entitled Sequence Iterators.
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</p>
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<p>Below is a list of functions to manipulate and query sequences.
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</p>
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<dl>
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<dt><a name="index-gimple_005fseq_005fadd_005fstmt"></a>GIMPLE function: <em>void</em> <strong>gimple_seq_add_stmt</strong> <em>(gimple_seq *seq, gimple g)</em></dt>
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<dd><p>Link a gimple statement to the end of the sequence *<code>SEQ</code> if <code>G</code> is
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not <code>NULL</code>. If *<code>SEQ</code> is <code>NULL</code>, allocate a sequence before linking.
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</p></dd></dl>
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<dl>
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<dt><a name="index-gimple_005fseq_005fadd_005fseq"></a>GIMPLE function: <em>void</em> <strong>gimple_seq_add_seq</strong> <em>(gimple_seq *dest, gimple_seq src)</em></dt>
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<dd><p>Append sequence <code>SRC</code> to the end of sequence *<code>DEST</code> if <code>SRC</code> is not
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<code>NULL</code>. If *<code>DEST</code> is <code>NULL</code>, allocate a new sequence before
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appending.
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</p></dd></dl>
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<dl>
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<dt><a name="index-gimple_005fseq_005fdeep_005fcopy"></a>GIMPLE function: <em>gimple_seq</em> <strong>gimple_seq_deep_copy</strong> <em>(gimple_seq src)</em></dt>
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<dd><p>Perform a deep copy of sequence <code>SRC</code> and return the result.
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</p></dd></dl>
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<dl>
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<dt><a name="index-gimple_005fseq_005freverse"></a>GIMPLE function: <em>gimple_seq</em> <strong>gimple_seq_reverse</strong> <em>(gimple_seq seq)</em></dt>
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<dd><p>Reverse the order of the statements in the sequence <code>SEQ</code>. Return
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<code>SEQ</code>.
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</p></dd></dl>
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<dl>
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<dt><a name="index-gimple_005fseq_005ffirst"></a>GIMPLE function: <em>gimple</em> <strong>gimple_seq_first</strong> <em>(gimple_seq s)</em></dt>
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<dd><p>Return the first statement in sequence <code>S</code>.
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</p></dd></dl>
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<dl>
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<dt><a name="index-gimple_005fseq_005flast"></a>GIMPLE function: <em>gimple</em> <strong>gimple_seq_last</strong> <em>(gimple_seq s)</em></dt>
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<dd><p>Return the last statement in sequence <code>S</code>.
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</p></dd></dl>
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<dl>
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<dt><a name="index-gimple_005fseq_005fset_005flast"></a>GIMPLE function: <em>void</em> <strong>gimple_seq_set_last</strong> <em>(gimple_seq s, gimple last)</em></dt>
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<dd><p>Set the last statement in sequence <code>S</code> to the statement in <code>LAST</code>.
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</p></dd></dl>
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<dl>
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<dt><a name="index-gimple_005fseq_005fset_005ffirst"></a>GIMPLE function: <em>void</em> <strong>gimple_seq_set_first</strong> <em>(gimple_seq s, gimple first)</em></dt>
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<dd><p>Set the first statement in sequence <code>S</code> to the statement in <code>FIRST</code>.
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</p></dd></dl>
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<dl>
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<dt><a name="index-gimple_005fseq_005finit"></a>GIMPLE function: <em>void</em> <strong>gimple_seq_init</strong> <em>(gimple_seq s)</em></dt>
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<dd><p>Initialize sequence <code>S</code> to an empty sequence.
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</p></dd></dl>
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<dl>
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<dt><a name="index-gimple_005fseq_005falloc"></a>GIMPLE function: <em>gimple_seq</em> <strong>gimple_seq_alloc</strong> <em>(void)</em></dt>
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<dd><p>Allocate a new sequence in the garbage collected store and return
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it.
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</p></dd></dl>
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<dl>
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<dt><a name="index-gimple_005fseq_005fcopy"></a>GIMPLE function: <em>void</em> <strong>gimple_seq_copy</strong> <em>(gimple_seq dest, gimple_seq src)</em></dt>
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<dd><p>Copy the sequence <code>SRC</code> into the sequence <code>DEST</code>.
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</p></dd></dl>
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<dl>
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<dt><a name="index-gimple_005fseq_005fempty_005fp"></a>GIMPLE function: <em>bool</em> <strong>gimple_seq_empty_p</strong> <em>(gimple_seq s)</em></dt>
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<dd><p>Return true if the sequence <code>S</code> is empty.
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</p></dd></dl>
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<dl>
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<dt><a name="index-bb_005fseq"></a>GIMPLE function: <em>gimple_seq</em> <strong>bb_seq</strong> <em>(basic_block bb)</em></dt>
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<dd><p>Returns the sequence of statements in <code>BB</code>.
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</p></dd></dl>
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<dl>
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<dt><a name="index-set_005fbb_005fseq"></a>GIMPLE function: <em>void</em> <strong>set_bb_seq</strong> <em>(basic_block bb, gimple_seq seq)</em></dt>
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<dd><p>Sets the sequence of statements in <code>BB</code> to <code>SEQ</code>.
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</p></dd></dl>
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<dl>
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<dt><a name="index-gimple_005fseq_005fsingleton_005fp"></a>GIMPLE function: <em>bool</em> <strong>gimple_seq_singleton_p</strong> <em>(gimple_seq seq)</em></dt>
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<dd><p>Determine whether <code>SEQ</code> contains exactly one statement.
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</p></dd></dl>
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<hr>
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<div class="header">
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<p>
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Next: <a href="Sequence-iterators.html#Sequence-iterators" accesskey="n" rel="next">Sequence iterators</a>, Previous: <a href="Tuple-specific-accessors.html#Tuple-specific-accessors" accesskey="p" rel="prev">Tuple specific accessors</a>, Up: <a href="GIMPLE.html#GIMPLE" accesskey="u" rel="up">GIMPLE</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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