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e8e1690475
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Branches: main
The following code causes code to be generated which seg-faults
:- interface
:- instance tc(list(T)).
:- implementation.
:- instance tc(list(T)) <= tc(T) where [...].
because the exported instance declaration doesn't contain the
typeclass constraint.
mercury/compiler/add_class.m:
Check that for all the "same" instance declarations
the instance constraints are exactly the same on each
declaration.
tests/invalid/incompatible_instance_constraints*:
Add tests for this code.
tests/invalid/*:
Fix some headvar name errors.
tests/valid/*:
Fix some invalid abstract instance declarations.
740 lines
30 KiB
Mathematica
740 lines
30 KiB
Mathematica
%-----------------------------------------------------------------------------%
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% vim: ft=mercury ts=4 sw=4 et
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%-----------------------------------------------------------------------------%
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% Copyright (C) 1993-2007 The University of Melbourne.
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% This file may only be copied under the terms of the GNU General
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% Public License - see the file COPYING in the Mercury distribution.
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%-----------------------------------------------------------------------------%
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:- module hlds.make_hlds.add_class.
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:- interface.
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:- import_module hlds.hlds_module.
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:- import_module hlds.hlds_pred.
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:- import_module hlds.make_hlds.make_hlds_passes.
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:- import_module hlds.make_hlds.qual_info.
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:- import_module mdbcomp.prim_data.
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:- import_module parse_tree.error_util.
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:- import_module parse_tree.prog_data.
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:- import_module list.
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:- import_module term.
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%-----------------------------------------------------------------------------%
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:- pred module_add_class_defn(list(prog_constraint)::in,
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list(prog_fundep)::in, sym_name::in, list(tvar)::in, class_interface::in,
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tvarset::in, prog_context::in, item_status::in,
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module_info::in, module_info::out,
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list(error_spec)::in, list(error_spec)::out) is det.
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:- pred module_add_instance_defn(module_name::in, list(prog_constraint)::in,
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sym_name::in, list(mer_type)::in, instance_body::in, tvarset::in,
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import_status::in, prog_context::in,
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module_info::in, module_info::out,
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list(error_spec)::in, list(error_spec)::out) is det.
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% Given the definition for a predicate or function from a
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% type class instance declaration, produce the clauses_info
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% for that definition.
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%
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:- pred do_produce_instance_method_clauses(instance_proc_def::in,
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pred_or_func::in, arity::in, list(mer_type)::in, pred_markers::in,
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term.context::in, import_status::in, clauses_info::out,
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module_info::in, module_info::out, qual_info::in, qual_info::out,
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list(error_spec)::in, list(error_spec)::out) is det.
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%-----------------------------------------------------------------------------%
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%-----------------------------------------------------------------------------%
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:- implementation.
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:- import_module check_hlds.clause_to_proc.
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:- import_module hlds.hlds_args.
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:- import_module hlds.hlds_data.
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:- import_module hlds.hlds_goal.
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:- import_module hlds.hlds_rtti.
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:- import_module hlds.make_hlds.add_clause.
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:- import_module hlds.make_hlds.add_pred.
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:- import_module hlds.make_hlds.add_type.
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:- import_module hlds.make_hlds.make_hlds_error.
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:- import_module hlds.make_hlds.make_hlds_warn.
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:- import_module hlds.make_hlds.state_var.
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:- import_module hlds.pred_table.
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:- import_module libs.compiler_util.
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:- import_module parse_tree.prog_type.
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:- import_module parse_tree.prog_type_subst.
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:- import_module parse_tree.prog_util.
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:- import_module bool.
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:- import_module int.
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:- import_module map.
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:- import_module pair.
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:- import_module set.
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:- import_module solutions.
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:- import_module string.
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:- import_module varset.
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module_add_class_defn(Constraints, FunDeps, Name, Vars, Interface, VarSet,
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Context, Status, !ModuleInfo, !Specs) :-
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module_info_get_class_table(!.ModuleInfo, Classes0),
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list.length(Vars, ClassArity),
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ClassId = class_id(Name, ClassArity),
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Status = item_status(ImportStatus0, _),
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(
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Interface = class_interface_abstract,
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make_status_abstract(ImportStatus0, ImportStatus1)
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;
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Interface = class_interface_concrete(_),
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ImportStatus1 = ImportStatus0
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),
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HLDSFunDeps = list.map(make_hlds_fundep(Vars), FunDeps),
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(
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% The typeclass is exported if *any* occurrence is exported,
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% even a previous abstract occurrence.
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map.search(Classes0, ClassId, OldDefn)
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->
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OldDefn = hlds_class_defn(OldStatus, OldConstraints, OldFunDeps,
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_OldAncestors, OldVars, _OldKinds, OldInterface, OldMethods,
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OldVarSet, OldContext),
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combine_status(ImportStatus1, OldStatus, ImportStatus),
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(
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OldInterface = class_interface_concrete(_),
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ClassMethods0 = OldMethods,
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ClassInterface = OldInterface
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;
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OldInterface = class_interface_abstract,
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ClassMethods0 = [],
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ClassInterface = Interface
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),
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(
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% Check that the superclass constraints are identical
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\+ constraints_are_identical(OldVars, OldVarSet,
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OldConstraints, Vars, VarSet, Constraints)
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->
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% Always report the error, even in `.opt' files.
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DummyStatus = status_local,
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Extras = [words("The superclass constraints do not match."), nl],
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multiple_def_error(DummyStatus, Name, ClassArity, "typeclass",
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Context, OldContext, Extras, !Specs),
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ErrorOrPrevDef = yes
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;
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\+ class_fundeps_are_identical(OldFunDeps, HLDSFunDeps)
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->
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% Always report the error, even in `.opt' files.
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DummyStatus = status_local,
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Extras = [words("The functional dependencies do not match."), nl],
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multiple_def_error(DummyStatus, Name, ClassArity, "typeclass",
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Context, OldContext, Extras, !Specs),
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ErrorOrPrevDef = yes
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;
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Interface = class_interface_concrete(_),
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OldInterface = class_interface_concrete(_)
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->
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multiple_def_error(ImportStatus, Name, ClassArity,
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"typeclass", Context, OldContext, [], !Specs),
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ErrorOrPrevDef = yes
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;
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ErrorOrPrevDef = no
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),
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IsNewDefn = no
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;
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IsNewDefn = yes `with_type` bool,
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ErrorOrPrevDef = no `with_type` bool,
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ClassMethods0 = [],
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ClassInterface = Interface,
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ImportStatus = ImportStatus1
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),
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(
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ErrorOrPrevDef = no,
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(
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Interface = class_interface_concrete(Methods),
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module_add_class_interface(Name, Vars, Methods,
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Status, PredProcIds0, !ModuleInfo, !Specs),
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% Get rid of the `no's from the list of maybes
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IsYes = (pred(Maybe::in, PredProcId::out) is semidet :-
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Maybe = yes(Pred - Proc),
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PredProcId = hlds_class_proc(Pred, Proc)
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),
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list.filter_map(IsYes, PredProcIds0, PredProcIds1),
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% The list must be sorted on pred_id and then proc_id --
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% check_typeclass.m assumes this when it is generating the
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% corresponding list of pred_proc_ids for instance definitions.
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list.sort(PredProcIds1, ClassMethods)
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;
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Interface = class_interface_abstract,
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ClassMethods = ClassMethods0
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),
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% Ancestors is not set until check_typeclass.
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Ancestors = [],
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% XXX kind inference:
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% We set all the kinds to `star' at the moment. This should be
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% done differently when we have a proper kind system.
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Kinds = map.init,
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Defn = hlds_class_defn(ImportStatus, Constraints, HLDSFunDeps,
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Ancestors, Vars, Kinds, ClassInterface, ClassMethods, VarSet,
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Context),
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map.set(Classes0, ClassId, Defn, Classes),
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module_info_set_class_table(Classes, !ModuleInfo),
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(
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IsNewDefn = yes,
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% When we find the class declaration, make an
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% entry for the instances.
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module_info_get_instance_table(!.ModuleInfo, Instances0),
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map.det_insert(Instances0, ClassId, [], Instances),
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module_info_set_instance_table(Instances, !ModuleInfo)
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;
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IsNewDefn = no
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)
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;
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ErrorOrPrevDef = yes
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).
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:- func make_hlds_fundep(list(tvar), prog_fundep) = hlds_class_fundep.
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make_hlds_fundep(TVars, fundep(Domain0, Range0)) = fundep(Domain, Range) :-
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Domain = make_hlds_fundep_2(TVars, Domain0),
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Range = make_hlds_fundep_2(TVars, Range0).
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:- func make_hlds_fundep_2(list(tvar), list(tvar)) = set(hlds_class_argpos).
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make_hlds_fundep_2(TVars, List) = list.foldl(Func, List, set.init) :-
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Func = (func(TVar, Set0) = set.insert(Set0, N) :-
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N = get_list_index(TVars, 1, TVar)
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).
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:- func get_list_index(list(T), hlds_class_argpos, T) = hlds_class_argpos.
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get_list_index([], _, _) = _ :-
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unexpected(this_file, "get_list_index: element not found").
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get_list_index([E | Es], N, X) =
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( X = E ->
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N
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;
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get_list_index(Es, N + 1, X)
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).
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:- pred constraints_are_identical(list(tvar)::in, tvarset::in,
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list(prog_constraint)::in, list(tvar)::in, tvarset::in,
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list(prog_constraint)::in) is semidet.
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constraints_are_identical(OldVars0, OldVarSet, OldConstraints0,
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Vars, VarSet, Constraints) :-
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tvarset_merge_renaming(VarSet, OldVarSet, _, Renaming),
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apply_variable_renaming_to_prog_constraint_list(Renaming, OldConstraints0,
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OldConstraints1),
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apply_variable_renaming_to_tvar_list(Renaming, OldVars0, OldVars),
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map.from_corresponding_lists(OldVars, Vars, VarRenaming),
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apply_variable_renaming_to_prog_constraint_list(VarRenaming,
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OldConstraints1, OldConstraints),
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OldConstraints = Constraints.
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:- pred class_fundeps_are_identical(hlds_class_fundeps::in,
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hlds_class_fundeps::in) is semidet.
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class_fundeps_are_identical(OldFunDeps0, FunDeps0) :-
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% Allow for the functional dependencies to be in a different order.
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% we rely on the fact that sets (ordered lists) have a canonical
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% representation.
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sort_and_remove_dups(OldFunDeps0, OldFunDeps),
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sort_and_remove_dups(FunDeps0, FunDeps),
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OldFunDeps = FunDeps.
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:- pred module_add_class_interface(sym_name::in, list(tvar)::in,
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class_methods::in, item_status::in,
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list(maybe(pair(pred_id, proc_id)))::out,
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module_info::in, module_info::out,
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list(error_spec)::in, list(error_spec)::out) is det.
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module_add_class_interface(Name, Vars, Methods, Status, PredProcIds,
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!ModuleInfo, !Specs) :-
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list.filter(is_class_method_mode_item, Methods, ModeMethods,
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PredOrFuncMethods),
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some [!PPIds] (
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add_class_pred_or_func_methods(Name, Vars, PredOrFuncMethods, Status,
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!:PPIds, !ModuleInfo, !Specs),
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% Add the pred_or_func_mode decls. Since we have already added the
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% predicate/function method decls there should already be an entry in
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% the predicate table corresponding to the mode item we are about to
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% add. If not, report an error.
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list.foldl3(add_class_pred_or_func_mode_method(Name, Vars, Status),
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ModeMethods, !PPIds, !ModuleInfo, !Specs),
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check_method_modes(Methods, !.PPIds, PredProcIds, !ModuleInfo, !Specs)
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).
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:- pred is_class_method_mode_item(class_method::in) is semidet.
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is_class_method_mode_item(Method) :-
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Method = method_pred_or_func_mode(_, _, _, _, _, _, _, _).
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:- pred add_class_pred_or_func_mode_method(sym_name::in,
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list(tvar)::in, item_status::in, class_method::in,
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list(maybe(pair(pred_id, proc_id)))::in,
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list(maybe(pair(pred_id, proc_id)))::out,
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module_info::in, module_info::out,
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list(error_spec)::in, list(error_spec)::out) is det.
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add_class_pred_or_func_mode_method(Name, Vars, Status, Method,
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!PredProcIds, !ModuleInfo, !Specs) :-
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(
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Method = method_pred_or_func(_, _, _, _, _, _, _, _, _, _, _, _, _),
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unexpected(this_file,
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"add_class_pred_or_func_mode_method: pred_or_func method item")
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;
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Method = method_pred_or_func_mode(_VarSet, MaybePredOrFunc, PredName,
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Modes, _WithInst, _MaybeDet, _Cond, Context)
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),
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module_info_get_predicate_table(!.ModuleInfo, PredTable),
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PredArity = list.length(Modes) : int,
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(
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% The only way this could have happened now is if a `with_inst`
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% annotation was not expanded.
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MaybePredOrFunc = no,
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unexpected(this_file, "add_class_pred_or_func_mode_method: " ++
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"unexpanded `with_inst` annotation")
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;
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MaybePredOrFunc = yes(PredOrFunc)
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),
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(
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predicate_table_search_pf_sym_arity(PredTable, is_fully_qualified,
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PredOrFunc, PredName, PredArity, Preds),
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Preds = [_ | _]
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->
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(
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Preds = [PredId],
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module_info_pred_info(!.ModuleInfo, PredId, PredInfo),
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pred_info_get_markers(PredInfo, PredMarkers),
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( check_marker(PredMarkers, marker_class_method) ->
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module_add_class_method(Method, Name, Vars, Status,
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PredProcId, !ModuleInfo, !Specs),
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list.cons(PredProcId, !PredProcIds)
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;
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% XXX It may also be worth reporting that although there
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% wasn't a matching class method, there was a matching
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% predicate/function.
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missing_pred_or_func_method_error(PredName, PredArity,
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PredOrFunc, Context, !Specs)
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)
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;
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% This shouldn't happen.
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Preds = [_, _ | _],
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unexpected(this_file, "multiple preds matching method mode")
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)
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;
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missing_pred_or_func_method_error(PredName, PredArity, PredOrFunc,
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Context, !Specs)
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).
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:- pred add_class_pred_or_func_methods(sym_name::in, list(tvar)::in,
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class_methods::in, item_status::in,
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list(maybe(pair(pred_id, proc_id)))::out,
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module_info::in, module_info::out,
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list(error_spec)::in, list(error_spec)::out) is det.
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add_class_pred_or_func_methods(_, _, [], _, [], !ModuleInfo, !Specs).
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add_class_pred_or_func_methods(Name, Vars, [M | Ms], Status, [P | Ps],
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!ModuleInfo, !Specs) :-
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module_add_class_method(M, Name, Vars, Status, P, !ModuleInfo, !Specs),
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add_class_pred_or_func_methods(Name, Vars, Ms, Status, Ps, !ModuleInfo,
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!Specs).
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:- pred module_add_class_method(class_method::in, sym_name::in, list(tvar)::in,
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item_status::in, maybe(pair(pred_id, proc_id))::out,
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module_info::in, module_info::out,
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list(error_spec)::in, list(error_spec)::out) is det.
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module_add_class_method(Method, Name, Vars, Status, MaybePredIdProcId,
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!ModuleInfo, !Specs) :-
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(
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Method = method_pred_or_func(TypeVarSet, InstVarSet, ExistQVars,
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PredOrFunc, PredName, TypesAndModes, _WithType, _WithInst,
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MaybeDet, _Cond, Purity, ClassContext, Context),
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% XXX kind inference:
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% We set the kinds to `star' at the moment. This will be different
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% when we have a kind system.
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prog_type.var_list_to_type_list(map.init, Vars, Args),
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ClassContext = constraints(UnivCnstrs, ExistCnstrs),
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NewUnivCnstrs = [constraint(Name, Args) | UnivCnstrs],
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NewClassContext = constraints(NewUnivCnstrs, ExistCnstrs),
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init_markers(Markers0),
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add_marker(marker_class_method, Markers0, Markers),
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module_add_pred_or_func(TypeVarSet, InstVarSet, ExistQVars, PredOrFunc,
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PredName, TypesAndModes, MaybeDet, Purity, NewClassContext,
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Markers, Context, Status, MaybePredIdProcId, !ModuleInfo, !Specs)
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;
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Method = method_pred_or_func_mode(VarSet, MaybePredOrFunc, PredName,
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Modes, _WithInst, MaybeDet, _Cond, Context),
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(
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MaybePredOrFunc = yes(PredOrFunc),
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Status = item_status(ImportStatus, _),
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IsClassMethod = yes,
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module_add_mode(VarSet, PredName, Modes, MaybeDet, ImportStatus,
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Context, PredOrFunc, IsClassMethod, PredIdProcId, !ModuleInfo,
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!Specs),
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MaybePredIdProcId = yes(PredIdProcId)
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;
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MaybePredOrFunc = no,
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% equiv_type.m should have either set the
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% pred_or_func or removed the item from the list.
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unexpected(this_file, "module_add_class_method: " ++
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"no pred_or_func on mode declaration")
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)
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).
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% Go through the list of class methods, looking for
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% - functions without mode declarations: add a default mode
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% - predicates without mode declarations: report an error
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% - mode declarations with no determinism: report an error
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%
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:- pred check_method_modes(class_methods::in,
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list(maybe(pair(pred_id, proc_id)))::in,
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list(maybe(pair(pred_id, proc_id)))::out,
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module_info::in, module_info::out,
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list(error_spec)::in, list(error_spec)::out) is det.
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check_method_modes([], !PredProcIds, !ModuleInfo, !Specs).
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check_method_modes([Method | Methods], !PredProcIds, !ModuleInfo, !Specs) :-
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(
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Method = method_pred_or_func(_, _, _, PorF, QualName, TypesAndModes,
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_WithType, _WithInst, _, _, _, _, _),
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(
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QualName = qualified(ModuleName0, Name0),
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ModuleName = ModuleName0,
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Name = Name0
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;
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QualName = unqualified(_),
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% The class interface should be fully module qualified
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% by prog_io.m at the time it is read in.
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unexpected(this_file,
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"add_default_class_method_func_modes: unqualified func")
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),
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list.length(TypesAndModes, PredArity),
|
|
module_info_get_predicate_table(!.ModuleInfo, PredTable),
|
|
(
|
|
predicate_table_search_pf_m_n_a(PredTable, is_fully_qualified,
|
|
PorF, ModuleName, Name, PredArity, [PredId])
|
|
->
|
|
module_info_pred_info(!.ModuleInfo, PredId, PredInfo0),
|
|
(
|
|
PorF = pf_function,
|
|
maybe_add_default_func_mode(PredInfo0, PredInfo, MaybeProc),
|
|
(
|
|
MaybeProc = no
|
|
;
|
|
MaybeProc = yes(ProcId),
|
|
NewPredProc = yes(PredId - ProcId),
|
|
!:PredProcIds = [NewPredProc | !.PredProcIds],
|
|
module_info_set_pred_info(PredId, PredInfo, !ModuleInfo)
|
|
)
|
|
;
|
|
PorF = pf_predicate,
|
|
pred_info_get_procedures(PredInfo0, Procs),
|
|
( map.is_empty(Procs) ->
|
|
pred_method_with_no_modes_error(PredInfo0, !Specs)
|
|
;
|
|
true
|
|
)
|
|
)
|
|
;
|
|
unexpected(this_file, "handle_methods_with_no_modes")
|
|
)
|
|
;
|
|
Method = method_pred_or_func_mode(_, _, _, _, _, _, _, _)
|
|
),
|
|
check_method_modes(Methods, !PredProcIds, !ModuleInfo, !Specs).
|
|
|
|
module_add_instance_defn(InstanceModuleName, Constraints, ClassName,
|
|
Types, Body0, VarSet, Status, Context, !ModuleInfo, !Specs) :-
|
|
module_info_get_class_table(!.ModuleInfo, Classes),
|
|
module_info_get_instance_table(!.ModuleInfo, Instances0),
|
|
list.length(Types, ClassArity),
|
|
ClassId = class_id(ClassName, ClassArity),
|
|
Body = expand_bang_state_var_args_in_instance_method_heads(Body0),
|
|
( map.search(Classes, ClassId, _) ->
|
|
map.init(Empty),
|
|
NewInstanceDefn = hlds_instance_defn(InstanceModuleName, Status,
|
|
Context, Constraints, Types, Body, no, VarSet, Empty),
|
|
map.lookup(Instances0, ClassId, InstanceDefns),
|
|
|
|
check_for_overlapping_instances(NewInstanceDefn, InstanceDefns,
|
|
ClassId, !Specs),
|
|
check_instance_compatibility(NewInstanceDefn, InstanceDefns,
|
|
ClassId, !Specs),
|
|
|
|
map.det_update(Instances0, ClassId,
|
|
[NewInstanceDefn | InstanceDefns], Instances),
|
|
module_info_set_instance_table(Instances, !ModuleInfo)
|
|
;
|
|
undefined_type_class_error(ClassName, ClassArity, Context,
|
|
"instance declaration", !Specs)
|
|
).
|
|
|
|
:- pred check_for_overlapping_instances(hlds_instance_defn::in,
|
|
list(hlds_instance_defn)::in, class_id::in,
|
|
list(error_spec)::in, list(error_spec)::out) is det.
|
|
|
|
check_for_overlapping_instances(NewInstanceDefn, InstanceDefns, ClassId,
|
|
!Specs) :-
|
|
IsOverlapping = (pred((Context - OtherContext)::out) is nondet :-
|
|
NewInstanceDefn = hlds_instance_defn(_, _Status, Context,
|
|
_, Types, Body, _, VarSet, _),
|
|
Body = instance_body_concrete(_), % XXX
|
|
list.member(OtherInstanceDefn, InstanceDefns),
|
|
OtherInstanceDefn = hlds_instance_defn(_, _OtherStatus,
|
|
OtherContext, _, OtherTypes, OtherBody, _, OtherVarSet, _),
|
|
OtherBody = instance_body_concrete(_), % XXX
|
|
tvarset_merge_renaming(VarSet, OtherVarSet, _NewVarSet, Renaming),
|
|
apply_variable_renaming_to_type_list(Renaming, OtherTypes,
|
|
NewOtherTypes),
|
|
type_list_subsumes(Types, NewOtherTypes, _)
|
|
),
|
|
solutions.aggregate(IsOverlapping,
|
|
report_overlapping_instance_declaration(ClassId), !Specs).
|
|
|
|
:- pred report_overlapping_instance_declaration(class_id::in,
|
|
pair(prog_context)::in,
|
|
list(error_spec)::in, list(error_spec)::out) is det.
|
|
|
|
report_overlapping_instance_declaration(class_id(ClassName, ClassArity),
|
|
Context - OtherContext, !Specs) :-
|
|
Pieces1 = [words("Error: multiply defined (or overlapping)"),
|
|
words("instance declarations for class"),
|
|
sym_name_and_arity(ClassName / ClassArity),
|
|
suffix("."), nl],
|
|
Pieces2 = [words("Previous instance declaration was here.")],
|
|
Msg1 = simple_msg(Context, [always(Pieces1)]),
|
|
Msg2 = error_msg(yes(OtherContext), yes, 0, [always(Pieces2)]),
|
|
Spec = error_spec(severity_error, phase_parse_tree_to_hlds, [Msg1, Msg2]),
|
|
!:Specs = [Spec | !.Specs].
|
|
|
|
|
|
%
|
|
% If two instance declarations are about the same type, then
|
|
% the declarations must be compatible. This consists of checking
|
|
% that the constraints are identical.
|
|
% In other words, the abstract declaration must match the
|
|
% concrete definition.
|
|
%
|
|
:- pred check_instance_compatibility(hlds_instance_defn::in,
|
|
list(hlds_instance_defn)::in, class_id::in,
|
|
list(error_spec)::in, list(error_spec)::out) is det.
|
|
|
|
check_instance_compatibility(InstanceDefn, InstanceDefns, ClassId, !Specs) :-
|
|
list.filter(same_type_hlds_instance_defn(InstanceDefn),
|
|
InstanceDefns, EquivInstanceDefns),
|
|
list.foldl(check_instance_constraints(InstanceDefn, ClassId),
|
|
EquivInstanceDefns, !Specs).
|
|
|
|
:- pred check_instance_constraints(hlds_instance_defn::in,
|
|
class_id::in, hlds_instance_defn::in,
|
|
list(error_spec)::in, list(error_spec)::out) is det.
|
|
|
|
check_instance_constraints(InstanceDefnA, ClassId, InstanceDefnB, !Specs) :-
|
|
type_vars_list(InstanceDefnA ^ instance_types, TVarsA),
|
|
TVarsetA = InstanceDefnA ^ instance_tvarset,
|
|
ConstraintsA = InstanceDefnA ^ instance_constraints,
|
|
|
|
type_vars_list(InstanceDefnB ^ instance_types, TVarsB),
|
|
TVarsetB = InstanceDefnB ^ instance_tvarset,
|
|
ConstraintsB = InstanceDefnB ^ instance_constraints,
|
|
|
|
(
|
|
constraints_are_identical(TVarsA, TVarsetA, ConstraintsA,
|
|
TVarsB, TVarsetB, ConstraintsB)
|
|
->
|
|
true
|
|
;
|
|
ClassId = class_id(Name, ClassArity),
|
|
ContextA = InstanceDefnA ^ instance_context,
|
|
|
|
TxtA = [words("In instance declaration for class "),
|
|
sym_name_and_arity(Name / ClassArity), nl,
|
|
words("instance constraints are incompatible with")],
|
|
MsgA = simple_msg(ContextA, [always(TxtA)]),
|
|
|
|
ContextB = InstanceDefnB ^ instance_context,
|
|
TxtB = [words("instance constraints here.")],
|
|
MsgB = simple_msg(ContextB, [always(TxtB)]),
|
|
|
|
Spec = error_spec(severity_error,
|
|
phase_parse_tree_to_hlds, [MsgA, MsgB]),
|
|
!:Specs = [Spec | !.Specs]
|
|
).
|
|
|
|
%
|
|
% Do two hlds_instance_defn refer to the same type?
|
|
% eg "instance tc(f(T))" compares equal to "instance tc(f(U))"
|
|
%
|
|
% Note we don't check that the constraints of the declarations are the
|
|
% same.
|
|
%
|
|
:- pred same_type_hlds_instance_defn(hlds_instance_defn::in,
|
|
hlds_instance_defn::in) is semidet.
|
|
|
|
same_type_hlds_instance_defn(InstanceDefnA, InstanceDefnB) :-
|
|
TypesA = InstanceDefnA ^ instance_types,
|
|
TypesB0 = InstanceDefnB ^ instance_types,
|
|
|
|
VarSetA = InstanceDefnA ^ instance_tvarset,
|
|
VarSetB = InstanceDefnB ^ instance_tvarset,
|
|
|
|
% Rename the two lists of types apart.
|
|
tvarset_merge_renaming(VarSetA, VarSetB, _NewVarSet, RenameApart),
|
|
apply_variable_renaming_to_type_list(RenameApart, TypesB0, TypesB1),
|
|
|
|
type_vars_list(TypesA, TVarsA),
|
|
type_vars_list(TypesB1, TVarsB),
|
|
|
|
% If the lengths are different they can't be the same type.
|
|
list.length(TVarsA, L),
|
|
list.length(TVarsB, L),
|
|
|
|
map.from_corresponding_lists(TVarsB, TVarsA, Renaming),
|
|
apply_variable_renaming_to_type_list(Renaming, TypesB1, TypesB),
|
|
|
|
TypesA = TypesB.
|
|
|
|
do_produce_instance_method_clauses(InstanceProcDefn, PredOrFunc, PredArity,
|
|
ArgTypes, Markers, Context, Status, ClausesInfo, !ModuleInfo,
|
|
!QualInfo, !Specs) :-
|
|
(
|
|
% Handle the `pred(<MethodName>/<Arity>) is <ImplName>' syntax.
|
|
InstanceProcDefn = instance_proc_def_name(InstancePredName),
|
|
% Add the body of the introduced pred.
|
|
% First the goal info, ...
|
|
goal_info_init(GoalInfo0),
|
|
goal_info_set_context(Context, GoalInfo0, GoalInfo1),
|
|
set.list_to_set(HeadVars, NonLocals),
|
|
goal_info_set_nonlocals(NonLocals, GoalInfo1, GoalInfo2),
|
|
( check_marker(Markers, marker_is_impure) ->
|
|
goal_info_set_purity(purity_impure, GoalInfo2, GoalInfo)
|
|
; check_marker(Markers, marker_is_semipure) ->
|
|
goal_info_set_purity(purity_semipure, GoalInfo2, GoalInfo)
|
|
;
|
|
GoalInfo = GoalInfo2
|
|
),
|
|
% ... and then the goal itself.
|
|
varset.init(VarSet0),
|
|
make_n_fresh_vars("HeadVar__", PredArity, HeadVars, VarSet0, VarSet),
|
|
construct_pred_or_func_call(invalid_pred_id, PredOrFunc,
|
|
InstancePredName, HeadVars, GoalInfo, IntroducedGoal, !QualInfo),
|
|
IntroducedClause = clause([], IntroducedGoal, impl_lang_mercury,
|
|
Context),
|
|
|
|
map.init(TVarNameMap),
|
|
map.from_corresponding_lists(HeadVars, ArgTypes, VarTypes),
|
|
HeadVarVec = proc_arg_vector_init(PredOrFunc, HeadVars),
|
|
set_clause_list([IntroducedClause], ClausesRep),
|
|
rtti_varmaps_init(RttiVarMaps),
|
|
HasForeignClauses = no,
|
|
ClausesInfo = clauses_info(VarSet, VarTypes, TVarNameMap, VarTypes,
|
|
HeadVarVec, ClausesRep, RttiVarMaps, HasForeignClauses)
|
|
;
|
|
% Handle the arbitrary clauses syntax.
|
|
InstanceProcDefn = instance_proc_def_clauses(InstanceClauses),
|
|
clauses_info_init(PredOrFunc, PredArity, ClausesInfo0),
|
|
list.foldl4(
|
|
produce_instance_method_clause(PredOrFunc, Context, Status),
|
|
InstanceClauses, !ModuleInfo, !QualInfo,
|
|
ClausesInfo0, ClausesInfo, !Specs)
|
|
).
|
|
|
|
:- pred produce_instance_method_clause(pred_or_func::in,
|
|
prog_context::in, import_status::in, item::in,
|
|
module_info::in, module_info::out, qual_info::in, qual_info::out,
|
|
clauses_info::in, clauses_info::out,
|
|
list(error_spec)::in, list(error_spec)::out) is det.
|
|
|
|
produce_instance_method_clause(PredOrFunc, Context, Status, InstanceClause,
|
|
!ModuleInfo, !QualInfo, !ClausesInfo, !Specs) :-
|
|
(
|
|
InstanceClause = item_clause(_Origin, CVarSet, PredOrFunc, PredName,
|
|
HeadTerms0, Body)
|
|
->
|
|
( illegal_state_var_func_result(PredOrFunc, HeadTerms0, StateVar) ->
|
|
report_illegal_func_svar_result(Context, CVarSet, StateVar, !Specs)
|
|
;
|
|
HeadTerms = expand_bang_state_var_args(HeadTerms0),
|
|
PredArity = list.length(HeadTerms),
|
|
adjust_func_arity(PredOrFunc, Arity, PredArity),
|
|
% The tvarset argument is only used for explicit type
|
|
% qualifications, of which there are none in this
|
|
% clause, so it is set to a dummy value.
|
|
varset.init(TVarSet0),
|
|
|
|
ProcIds = [],
|
|
% Means this clause applies to _every_ mode of the procedure.
|
|
GoalType = goal_type_none, % goal is not a promise
|
|
clauses_info_add_clause(ProcIds, CVarSet, TVarSet0, HeadTerms,
|
|
Body, Context, Status, PredOrFunc, Arity, GoalType, Goal,
|
|
VarSet, _TVarSet, !ClausesInfo, Warnings, !ModuleInfo,
|
|
!QualInfo, !Specs),
|
|
|
|
SimpleCallId = simple_call_id(PredOrFunc, PredName, Arity),
|
|
|
|
% Warn about singleton variables.
|
|
warn_singletons(VarSet, SimpleCallId, !.ModuleInfo, Goal, !Specs),
|
|
|
|
% Warn about variables with overlapping scopes.
|
|
warn_overlap(Warnings, VarSet, SimpleCallId, !Specs)
|
|
)
|
|
;
|
|
unexpected(this_file, "produce_clause: invalid instance item")
|
|
).
|
|
|
|
:- pred pred_method_with_no_modes_error(pred_info::in,
|
|
list(error_spec)::in, list(error_spec)::out) is det.
|
|
|
|
pred_method_with_no_modes_error(PredInfo, !Specs) :-
|
|
pred_info_get_context(PredInfo, Context),
|
|
Module = pred_info_module(PredInfo),
|
|
Name = pred_info_name(PredInfo),
|
|
Arity = pred_info_orig_arity(PredInfo),
|
|
|
|
Pieces = [words("Error: no mode declaration"),
|
|
words("for type class method predicate"),
|
|
sym_name_and_arity(qualified(Module, Name) / Arity), suffix("."), nl],
|
|
Msg = simple_msg(Context, [always(Pieces)]),
|
|
Spec = error_spec(severity_error, phase_parse_tree_to_hlds, [Msg]),
|
|
!:Specs = [Spec | !.Specs].
|
|
|
|
:- pred undefined_type_class_error(sym_name::in, arity::in, prog_context::in,
|
|
string::in, list(error_spec)::in, list(error_spec)::out) is det.
|
|
|
|
undefined_type_class_error(ClassName, Arity, Context, Description, !Specs) :-
|
|
Pieces = [words("Error:"), words(Description), words("for"),
|
|
sym_name_and_arity(ClassName / Arity),
|
|
words("without preceding typeclass declaration."), nl],
|
|
Msg = simple_msg(Context, [always(Pieces)]),
|
|
Spec = error_spec(severity_error, phase_parse_tree_to_hlds, [Msg]),
|
|
!:Specs = [Spec | !.Specs].
|
|
|
|
:- pred missing_pred_or_func_method_error(sym_name::in, arity::in,
|
|
pred_or_func::in, prog_context::in,
|
|
list(error_spec)::in, list(error_spec)::out) is det.
|
|
|
|
missing_pred_or_func_method_error(Name, Arity, PredOrFunc, Context, !Specs) :-
|
|
Pieces = [words("Error: mode declaration for type class method"),
|
|
sym_name_and_arity(Name / Arity), words("without corresponding"),
|
|
p_or_f(PredOrFunc), words("method declaration."), nl],
|
|
Msg = simple_msg(Context, [always(Pieces)]),
|
|
Spec = error_spec(severity_error, phase_parse_tree_to_hlds, [Msg]),
|
|
!:Specs = [Spec | !.Specs].
|
|
|
|
%-----------------------------------------------------------------------------%
|
|
|
|
:- func this_file = string.
|
|
|
|
this_file = "add_class.m".
|
|
|
|
%-----------------------------------------------------------------------------%
|
|
:- end_module add_class.
|
|
%-----------------------------------------------------------------------------%
|