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testing that a Gimple call argument is a string...


I'm coding in MELT the ex06/ of
which should typecheck calls to variadic functions json_pack & json_unpack
from (a JSON library in C).

I'm working on a MELT pass on Gimple/SSA after phiopt (maybe that place is wrong?)

I don't understand well how to check that a given Gimple argument is a string.
I was thinking of using useless_type_conversion_p or types_compatible_p on the TREE_TYPE of some POINTER_TYPE with char_type_node, but it seems to not work as I would expect

How would you (in C++ or C for a 4.6) code such a test (that argument 2 of some GIMPLE_CALL is a string, ie. a char* in C parlance)?

(I'm coding in MELT, but I am not asking a MELT specific question; I have hard time understanding how that should be coded in C++).

Or where is the typechecking for __attribute__((format(printf))) functions done in the GCC source tree?


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