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Change internal terminology so we more clearly distinguish between a list of
definitions 'defs' and functions that take an entire abstract syntax
trees 'ast'.
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This refactoring is intended to allow this type to have more than just a
list of definitions in future.
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Previously the specialization would remove any polymorphic union
constructor that was never created anywhere in the
specification. While this wasn't usually problematic, it does leave an
edge case where such a constructor could be matched upon in a pattern,
and then the resulting match would fail to compile as it would be
matching on a constructor kind that doesn't exists.
This should fix that issue by chaging the V_ctor_kind value into an
F_ctor_kind fragment. Previously a polymorphic constructor-kind would
have been represented by its mangled name, e.g.
V_ctor_kind "zSome_unit"
would now be represented as
V_ctor_kind ("Some", unifiers, ty)
where ty is a monomorphic version of the original constructor's type
such that
ctyp_unify original_ty ty = unifiers
and the mangled name we generate is
zencode_string ("Some_" ^ string_of_list "_" string_of_ctyp unifiers)
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Add a flag in C backend ctx that allows us to generate arbitrary
precision signed integer types, rather than just int64
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specialize functions now take a 'specialization' parameter that
specifies how they will specialize the AST. typ_ord_specialization
gives the previous behaviour, whereas int_specialization allows
specializing on Int-kinded arguments. Note that this can loop forever
unless the appropriate case splits are inserted beforehand, presumably
by monomorphisation.
rename is_nat_kopt -> is_int_kopt for consistency
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Not ideal because it keeps everything that's not a function, but good
enough for quick tests extracted from arm.
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Change Typ_arg_ to A_. We use it a lot more now typ_arg is used instead of
uvar as the result of unify. Plus A_ could either stand for argument, or
Any/A type which is quite appropriate in most use cases.
Restore instantiation info in infer_funapp'. Ideally we would save this
instead of recomputing it ever time we need it. However I checked and
there are over 300 places in the code that would need to be changed to add
an extra argument to E_app. Still some issues causing specialisation to
fail however.
Improve the error message when we swap how we infer/check an l-expression,
as this could previously cause the actual cause of a type-checking failure
to be effectively hidden.
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Also work on making C backend compile RISC-V
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Also updated some of the documentation in the sail source code
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