112 lines
5.1 KiB
HTML
112 lines
5.1 KiB
HTML
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<title>GNU Compiler Collection (GCC) Internals: Adding a new GIMPLE statement code</title>
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<link href="GIMPLE.html#GIMPLE" rel="up" title="GIMPLE">
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<link href="Statement-and-operand-traversals.html#Statement-and-operand-traversals" rel="next" title="Statement and operand traversals">
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<a name="Adding-a-new-GIMPLE-statement-code"></a>
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<p>
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Next: <a href="Statement-and-operand-traversals.html#Statement-and-operand-traversals" accesskey="n" rel="next">Statement and operand traversals</a>, Previous: <a href="Sequence-iterators.html#Sequence-iterators" accesskey="p" rel="prev">Sequence iterators</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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<a name="Adding-a-new-GIMPLE-statement-code-1"></a>
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<h3 class="section">11.11 Adding a new GIMPLE statement code</h3>
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<a name="index-Adding-a-new-GIMPLE-statement-code"></a>
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<p>The first step in adding a new GIMPLE statement code, is
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modifying the file <code>gimple.def</code>, which contains all the GIMPLE
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codes. Then you must add a corresponding gimple subclass
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located in <code>gimple.h</code>. This in turn, will require you to add a
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corresponding <code>GTY</code> tag in <code>gsstruct.def</code>, and code to handle
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this tag in <code>gss_for_code</code> which is located in <code>gimple.c</code>.
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</p>
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<p>In order for the garbage collector to know the size of the
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structure you created in <code>gimple.h</code>, you need to add a case to
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handle your new GIMPLE statement in <code>gimple_size</code> which is located
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in <code>gimple.c</code>.
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</p>
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<p>You will probably want to create a function to build the new
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gimple statement in <code>gimple.c</code>. The function should be called
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<code>gimple_build_<var>new-tuple-name</var></code>, and should return the new tuple
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as a pointer to the appropriate gimple subclass.
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</p>
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<p>If your new statement requires accessors for any members or
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operands it may have, put simple inline accessors in
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<code>gimple.h</code> and any non-trivial accessors in <code>gimple.c</code> with a
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corresponding prototype in <code>gimple.h</code>.
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</p>
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<p>You should add the new statement subclass to the class hierarchy diagram
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in <code>gimple.texi</code>.
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</p>
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