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<a name="Language-dependent-trees"></a>
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<a name="Language_002ddependent-trees"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="C-and-C_002b_002b-Trees.html#C-and-C_002b_002b-Trees">C and C++ Trees</a>,
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Previous: <a rel="previous" accesskey="p" href="Functions.html#Functions">Functions</a>,
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Up: <a rel="up" accesskey="u" href="GENERIC.html#GENERIC">GENERIC</a>
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<h3 class="section">10.9 Language-dependent trees</h3>
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<p><a name="index-language_002ddependent-trees-1992"></a>
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Front ends may wish to keep some state associated with various GENERIC
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trees while parsing. To support this, trees provide a set of flags
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that may be used by the front end. They are accessed using
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<code>TREE_LANG_FLAG_n</code> where ‘<samp><span class="samp">n</span></samp>’ is currently 0 through 6.
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<p>If necessary, a front end can use some language-dependent tree
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codes in its GENERIC representation, so long as it provides a
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hook for converting them to GIMPLE and doesn't expect them to
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work with any (hypothetical) optimizers that run before the
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conversion to GIMPLE. The intermediate representation used while
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parsing C and C++ looks very little like GENERIC, but the C and
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C++ gimplifier hooks are perfectly happy to take it as input and
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spit out GIMPLE.
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