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extern void x1f4_hook_expression (void *x1f4_expression, unsigned *mask);

The `x1f4_hook_expression`

function describes the arguments evaluation
status for the `x1f4_expression`

function being evaluated.

See Late Function Arguments Evaluation.

After function call, the `unsigned`

record pointed to by `mask`

will
have the bits corresponding the already evaluated arguments set, the rest of
the bits unset. The least significant bit refers the last function argument,
the second least significant bit refers the second last function argument and
so on.

The function should only be called from the routine performing the symbolic function logic.