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| <h3 class="section">11.11 Adding a new GIMPLE statement code</h3> |
| <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 |
| modifying the file <code>gimple.def</code>, which contains all the GIMPLE |
| codes. Then you must add a corresponding gimple_statement_base subclass |
| located in <code>gimple.h</code>. This in turn, will require you to add a |
| corresponding <code>GTY</code> tag in <code>gsstruct.def</code>, and code to handle |
| this tag in <code>gss_for_code</code> which is located in <code>gimple.c</code>. |
| </p> |
| <p>In order for the garbage collector to know the size of the |
| structure you created in <code>gimple.h</code>, you need to add a case to |
| handle your new GIMPLE statement in <code>gimple_size</code> which is located |
| in <code>gimple.c</code>. |
| </p> |
| <p>You will probably want to create a function to build the new |
| gimple statement in <code>gimple.c</code>. The function should be called |
| <code>gimple_build_<var>new-tuple-name</var></code>, and should return the new tuple |
| as a pointer to the appropriate gimple_statement_base subclass. |
| </p> |
| <p>If your new statement requires accessors for any members or |
| operands it may have, put simple inline accessors in |
| <code>gimple.h</code> and any non-trivial accessors in <code>gimple.c</code> with a |
| corresponding prototype in <code>gimple.h</code>. |
| </p> |
| <p>You should add the new statement subclass to the class hierarchy diagram |
| in <code>gimple.texi</code>. |
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