def grab_byte(typingctx, data, offset):
# returns a byte at a given offset in data
def impl(context, builder, signature, args):
data, idx = args
ptr = builder.bitcast(data, ir.IntType(8).as_pointer())
ch = builder.load(builder.gep(ptr, [idx]))
return ch
sig = types.uint8(types.voidptr, types.intp)
return sig, impl
def _Py_CHARMASK(ch):
"""
Equivalent to the CPython macro `Py_CHARMASK()`, masks off all but the
lowest 256 bits of ch.
"""
return types.uint8(ch) & types.uint8(0xff)
