ffi: support 64 bit bitfields.

* ffi.c (struct txr_ffi_type): Replace unsigned mask member
with a union m which holds unsigned mask and 64-bit fmask (fat
mask).
(ffi_sbit_put, ffi_sbit_get, ffi_ubit_put, ffi_ubit_get):
Refer to m.mask.
(ffi_fat_sbit_put, ffi_fat_sbit_get, ffi_fat_ubit_put,
ffi_fat_ubit_get): New static functions.
(ffi_generic_fat_sbit_put, ffi_generic_fat_sbit_get,
ffi_generic_fat_ubit_put, ffi_generic_fat_ubit_get):
Likewise.
(make_ffi_type_struct, make_ffi_type_union): Set up fat
mask for bitfields that are wider than int.
(ffi_type_compile): Refer to m.mask for the int and unsigned
int based bitfields declared with sbit and ubit that don't
mention a type. The bit operator now allows int64 and uint64
to be valid types for a bitfield. In this case, the "fat"
get and put functions are selected which use 64 bit operations.
Thus there is no efficiency impact on non-fat bitfields which
continue to use code with 32 bit operands.

(ffi_offsetof): Use the bitfield flag in the member's type
structure to detect bitfields, rather than the mask.

0 files changed, 0 insertions, 0 deletions