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Front ends may wish to keep some state associated with various GENERICtrees while parsing. To support this, trees provide a set of flagsthat may be used by the front end. They are accessed usingTREE_LANG_FLAG_n where ‘n’ is currently 0 through 6.
If necessary, a front end can use some language-dependent treecodes in its GENERIC representation, so long as it provides ahook for converting them to GIMPLE and doesn’t expect them towork with any (hypothetical) optimizers that run before theconversion to GIMPLE. The intermediate representation used whileparsing C and C++ looks very little like GENERIC, but the C andC++ gimplifier hooks are perfectly happy to take it as input andspit out GIMPLE.