Comments (3)
those effects are just because you haven't told it what the symbol is.
julia> f(x) = x.body
f (generic function with 1 method)
julia> Base.infer_effects(f, (Type{TT1},))
(+c,+e,!n,+t,+s,+m,+u)
from julia.
it's much weirder than that.
julia> objectid(TT1)
0xda12ac8fd4db99e3
julia> objectid(TT2)
0xda12ac8fd4db99e3
julia> objectid(TT2.body)
0x0d495eccbd8d7532
julia> objectid(TT1.body)
0xa84320db54f6eb75
from julia.
That behavior seems required by the doc-comment for objectid
:
help?> Base.objectid
objectid(x) -> UInt
Get a hash value for x based on object identity.
If x === y then objectid(x) == objectid(y), and usually when x !== y, objectid(x) != objectid(y).
See also hash, IdDict.
So your observation is just that:
julia> TT1 === TT2 && TT1.body !== TT2.body
true
which I do find intuitively very surprising as a definition for egality.
It certainly disagrees with the statement that "no program can distinguish x and y, if x === y
", and it seems to imply that ===
is not sufficient for inlining/substituting an object in IR - you have to also prove that it is used only :consistent
-ly.
But the effects are at least correct in that case:
julia> Base.infer_effects(Core.getfield, (Type{TT1}, Symbol))
(!c,+e,!n,+t,+s,+m,+i)
from julia.
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from julia.