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116 lines
3.6 KiB
Mathematica
116 lines
3.6 KiB
Mathematica
%-----------------------------------------------------------------------------%
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%-----------------------------------------------------------------------------%
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% File: type_util.nl.
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% Main author: fjh.
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% This file provides some utility predicates which operate on types.
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% It is used by various stages of the compilation after type-checking,
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% include the mode checker and the code generator.
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%-----------------------------------------------------------------------------%
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%-----------------------------------------------------------------------------%
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:- module type_util.
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:- interface.
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:- import_module prog_io, hlds.
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%-----------------------------------------------------------------------------%
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% Succeed iff type is an "atomic" type - one which can be
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% unified using a simple_unify (register comparison) rather
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% than a complicated_unify.
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:- pred type_is_atomic(type, module_info).
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:- mode type_is_atomic(in, in) is semidet.
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%-----------------------------------------------------------------------------%
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% Given a type, determine what sort of type it is.
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:- pred classify_type(type, module_info, builtin_type).
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:- mode classify_type(in, in, out) is det.
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:- type builtin_type ---> inttype
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; chartype
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; strtype
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; enumtype
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; usertype(type).
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%-----------------------------------------------------------------------------%
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% Given a non-variable type, return it's type-id and argument types.
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:- pred type_to_type_id(type, type_id, list(type)).
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:- mode type_to_type_id(in, out, out) is semidet.
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% Given a constant and an arity, return a type_id.
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% Fails if the constant is not an atom.
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:- pred make_type_id(const, int, type_id).
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:- mode make_type_id(in, in, out) is semidet.
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%-----------------------------------------------------------------------------%
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%-----------------------------------------------------------------------------%
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:- implementation.
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:- import_module list, term, require, map, std_util.
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type_is_atomic(Type, ModuleInfo) :-
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classify_type(Type, ModuleInfo, BuiltinType),
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% XXX we can't use \= until the compiler handles
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% scopes for \= properly.
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\+ BuiltinType = usertype(_).
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%-----------------------------------------------------------------------------%
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% Given a type, determine what sort of type it is.
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classify_type(VarType, ModuleInfo, Type) :-
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(
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VarType = term__functor(term__atom("character"), [], _)
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->
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Type = chartype
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;
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VarType = term__functor(term__atom("int"), [], _)
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->
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Type = inttype
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;
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VarType = term__functor(term__atom("string"), [], _)
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->
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Type = strtype
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;
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type_is_enumeration(VarType, ModuleInfo)
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->
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Type = enumtype
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;
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Type = usertype(VarType)
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).
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:- pred type_is_enumeration(type, module_info).
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:- mode type_is_enumeration(in, in) is semidet.
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type_is_enumeration(Type, ModuleInfo) :-
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type_to_type_id(Type, TypeId, _),
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module_info_types(ModuleInfo, TypeDefnTable),
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map__lookup(TypeDefnTable, TypeId, TypeDefn),
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TypeDefn = hlds__type_defn(_, _, TypeBody, _, _),
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TypeBody = du_type(_, _, IsEnum),
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IsEnum = yes.
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type_to_type_id(term__functor(Name, Args, _), TypeId, Args) :-
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list__length(Args, Arity),
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make_type_id(Name, Arity, TypeId).
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%-----------------------------------------------------------------------------%
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% Given a constant and an arity, return a type_id.
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% This really ought to take a name and an arity -
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% use of integers/floats/strings as type names should
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% be rejected by the parser in prog_io.nl, not in undef_types.nl.
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make_type_id(term__atom(Name), Arity, unqualified(Name) - Arity).
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%-----------------------------------------------------------------------------%
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%-----------------------------------------------------------------------------%
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