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| <h3 class="section">10.9 Language-dependent trees</h3> |
| <a name="index-language_002ddependent-trees"></a> |
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| <p>Front ends may wish to keep some state associated with various GENERIC |
| trees while parsing. To support this, trees provide a set of flags |
| that may be used by the front end. They are accessed using |
| <code>TREE_LANG_FLAG_n</code> where ‘<samp>n</samp>’ is currently 0 through 6. |
| </p> |
| <p>If necessary, a front end can use some language-dependent tree |
| codes in its GENERIC representation, so long as it provides a |
| hook for converting them to GIMPLE and doesn’t expect them to |
| work with any (hypothetical) optimizers that run before the |
| conversion to GIMPLE. The intermediate representation used while |
| parsing C and C++ looks very little like GENERIC, but the C and |
| C++ gimplifier hooks are perfectly happy to take it as input and |
| spit out GIMPLE. |
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