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