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<title>GNU Compiler Collection (GCC) Internals: Plugins pass</title>
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<a name="Plugins-pass"></a>
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<div class="header">
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<p>
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Next: <a href="Plugins-GC.html#Plugins-GC" accesskey="n" rel="next">Plugins GC</a>, Previous: <a href="Plugin-API.html#Plugin-API" accesskey="p" rel="prev">Plugin API</a>, Up: <a href="Plugins.html#Plugins" accesskey="u" rel="up">Plugins</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="Interacting-with-the-pass-manager"></a>
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<h3 class="section">23.3 Interacting with the pass manager</h3>
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<p>There needs to be a way to add/reorder/remove passes dynamically. This
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is useful for both analysis plugins (plugging in after a certain pass
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such as CFG or an IPA pass) and optimization plugins.
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</p>
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<p>Basic support for inserting new passes or replacing existing passes is
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provided. A plugin registers a new pass with GCC by calling
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<code>register_callback</code> with the <code>PLUGIN_PASS_MANAGER_SETUP</code>
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event and a pointer to a <code>struct register_pass_info</code> object defined as follows
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</p>
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<div class="smallexample">
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<pre class="smallexample">enum pass_positioning_ops
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{
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PASS_POS_INSERT_AFTER, // Insert after the reference pass.
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PASS_POS_INSERT_BEFORE, // Insert before the reference pass.
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PASS_POS_REPLACE // Replace the reference pass.
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};
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struct register_pass_info
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{
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struct opt_pass *pass; /* New pass provided by the plugin. */
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const char *reference_pass_name; /* Name of the reference pass for hooking
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up the new pass. */
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int ref_pass_instance_number; /* Insert the pass at the specified
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instance number of the reference pass. */
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/* Do it for every instance if it is 0. */
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enum pass_positioning_ops pos_op; /* how to insert the new pass. */
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};
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/* Sample plugin code that registers a new pass. */
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int
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plugin_init (struct plugin_name_args *plugin_info,
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struct plugin_gcc_version *version)
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{
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struct register_pass_info pass_info;
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...
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/* Code to fill in the pass_info object with new pass information. */
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...
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/* Register the new pass. */
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register_callback (plugin_info->base_name, PLUGIN_PASS_MANAGER_SETUP, NULL, &pass_info);
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...
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}
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</pre></div>
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