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<a name="Source-Files-Containing-Type-Information"></a>
<h3 class="section">23.5 Source Files Containing Type Information</h3>
<a name="index-generated-files"></a>
<a name="index-files_002c-generated"></a>

<p>Whenever you add <code>GTY</code> markers to a source file that previously
had none, or create a new source file containing <code>GTY</code> markers,
there are three things you need to do:
</p>
<ol>
<li> You need to add the file to the list of source files the type
machinery scans.  There are four cases:

<ol type="a" start="1">
<li> For a back-end file, this is usually done
automatically; if not, you should add it to <code>target_gtfiles</code> in
the appropriate port&rsquo;s entries in <samp>config.gcc</samp>.

</li><li> For files shared by all front ends, add the filename to the
<code>GTFILES</code> variable in <samp>Makefile.in</samp>.

</li><li> For files that are part of one front end, add the filename to the
<code>gtfiles</code> variable defined in the appropriate
<samp>config-lang.in</samp>.
Headers should appear before non-headers in this list.

</li><li> For files that are part of some but not all front ends, add the
filename to the <code>gtfiles</code> variable of <em>all</em> the front ends
that use it.
</li></ol>

</li><li> If the file was a header file, you&rsquo;ll need to check that it&rsquo;s included
in the right place to be visible to the generated files.  For a back-end
header file, this should be done automatically.  For a front-end header
file, it needs to be included by the same file that includes
<samp>gtype-<var>lang</var>.h</samp>.  For other header files, it needs to be
included in <samp>gtype-desc.c</samp>, which is a generated file, so add it to
<code>ifiles</code> in <code>open_base_file</code> in <samp>gengtype.c</samp>.

<p>For source files that aren&rsquo;t header files, the machinery will generate a
header file that should be included in the source file you just changed.
The file will be called <samp>gt-<var>path</var>.h</samp> where <var>path</var> is the
pathname relative to the <samp>gcc</samp> directory with slashes replaced by
<tt>-</tt>, so for example the header file to be included in
<samp>cp/parser.c</samp> is called <samp>gt-cp-parser.c</samp>.  The
generated header file should be included after everything else in the
source file.  Don&rsquo;t forget to mention this file as a dependency in the
<samp>Makefile</samp>!
</p>
</li></ol>

<p>For language frontends, there is another file that needs to be included
somewhere.  It will be called <samp>gtype-<var>lang</var>.h</samp>, where
<var>lang</var> is the name of the subdirectory the language is contained in.
</p>
<p>Plugins can add additional root tables.  Run the <code>gengtype</code>
utility in plugin mode as <code>gengtype -P pluginout.h <var>source-dir</var>
<var>file-list</var> <var>plugin*.c</var></code> with your plugin files
<var>plugin*.c</var> using <code>GTY</code> to generate the <var>pluginout.h</var> file.
The GCC build tree is needed to be present in that mode.
</p>

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