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<a name="Files"></a>
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<div class="header">
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<p>
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Next: <a href="Invoking-the-garbage-collector.html#Invoking-the-garbage-collector" accesskey="n" rel="next">Invoking the garbage collector</a>, Previous: <a href="GGC-Roots.html#GGC-Roots" accesskey="p" rel="prev">GGC Roots</a>, Up: <a href="Type-Information.html#Type-Information" accesskey="u" rel="up">Type Information</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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</div>
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<hr>
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<a name="Source-Files-Containing-Type-Information"></a>
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<h3 class="section">22.5 Source Files Containing Type Information</h3>
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<a name="index-generated-files"></a>
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<a name="index-files_002c-generated"></a>
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<p>Whenever you add <code>GTY</code> markers to a source file that previously
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had none, or create a new source file containing <code>GTY</code> markers,
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there are three things you need to do:
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</p>
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<ol>
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<li> You need to add the file to the list of source files the type
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machinery scans. There are four cases:
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<ol>
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<li> For a back-end file, this is usually done
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automatically; if not, you should add it to <code>target_gtfiles</code> in
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the appropriate port’s entries in <samp>config.gcc</samp>.
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</li><li> For files shared by all front ends, add the filename to the
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<code>GTFILES</code> variable in <samp>Makefile.in</samp>.
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</li><li> For files that are part of one front end, add the filename to the
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<code>gtfiles</code> variable defined in the appropriate
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<samp>config-lang.in</samp>.
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Headers should appear before non-headers in this list.
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</li><li> For files that are part of some but not all front ends, add the
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filename to the <code>gtfiles</code> variable of <em>all</em> the front ends
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that use it.
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</li></ol>
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</li><li> If the file was a header file, you’ll need to check that it’s included
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in the right place to be visible to the generated files. For a back-end
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header file, this should be done automatically. For a front-end header
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file, it needs to be included by the same file that includes
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<samp>gtype-<var>lang</var>.h</samp>. For other header files, it needs to be
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included in <samp>gtype-desc.c</samp>, which is a generated file, so add it to
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<code>ifiles</code> in <code>open_base_file</code> in <samp>gengtype.c</samp>.
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<p>For source files that aren’t header files, the machinery will generate a
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header file that should be included in the source file you just changed.
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The file will be called <samp>gt-<var>path</var>.h</samp> where <var>path</var> is the
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pathname relative to the <samp>gcc</samp> directory with slashes replaced by
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<tt>-</tt>, so for example the header file to be included in
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<samp>cp/parser.c</samp> is called <samp>gt-cp-parser.c</samp>. The
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generated header file should be included after everything else in the
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source file. Don’t forget to mention this file as a dependency in the
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<samp>Makefile</samp>!
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</p>
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</li></ol>
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<p>For language frontends, there is another file that needs to be included
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somewhere. It will be called <samp>gtype-<var>lang</var>.h</samp>, where
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<var>lang</var> is the name of the subdirectory the language is contained in.
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</p>
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<p>Plugins can add additional root tables. Run the <code>gengtype</code>
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utility in plugin mode as <code>gengtype -P pluginout.h <var>source-dir</var>
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<var>file-list</var> <var>plugin*.c</var></code> with your plugin files
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<var>plugin*.c</var> using <code>GTY</code> to generate the <var>pluginout.h</var> file.
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The GCC build tree is needed to be present in that mode.
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</p>
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<hr>
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<div class="header">
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<p>
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Next: <a href="Invoking-the-garbage-collector.html#Invoking-the-garbage-collector" accesskey="n" rel="next">Invoking the garbage collector</a>, Previous: <a href="GGC-Roots.html#GGC-Roots" accesskey="p" rel="prev">GGC Roots</a>, Up: <a href="Type-Information.html#Type-Information" accesskey="u" rel="up">Type Information</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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