mirror of
https://github.com/Mercury-Language/mercury.git
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b560f66ab9
After this, I think all modules in the check_hlds package belong there.
compiler/inst_match.m:
compiler/mode_test.m:
Move these modules from the check_hlds package to the hlds package
because most of their uses are outside the semantic analysis passes
that the check_hlds package is intended to contain.
compiler/inst_merge.m:
Move this module from the check_hlds package to the hlds package
because it is imported by only two modules, instmap.m and inst_match.m,
and after this diff, both are in the hlds package.
compiler/implementation_defined_literals.m:
Move this module from the check_hlds package to the hlds package
because it does a straightforward program transformation that
does not have anything to do with semantic analysis (though its
invocation does happen between semantic analysis passes).
compiler/notes/compiler_design.html:
Update the documentation of the goal_path.m module. (I checked the
documentation of the moved modules, which did not need updates,
and found the need for this instead.)
compiler/*.m:
Conform to the changes above. (For many modules, this deletes
their import of the check_hlds package itself.)
537 lines
21 KiB
Mathematica
537 lines
21 KiB
Mathematica
%-----------------------------------------------------------------------------%
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% vim: ft=mercury ts=4 sw=4 et
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%-----------------------------------------------------------------------------%
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% Copyright (C) 2005-2012 The University of Melbourne.
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% Copyright (C) 2017, 2026 The Mercury Team.
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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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%
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% File: closure_analysis.m
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% Main author: juliensf
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%
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% Perform local closure analysis on procedures. This involves tracking
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% the possible values that a higher-order variable can take within a
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% procedure. We attach this information to places where knowing the
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% possible values of a higher-order call may be useful.
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%
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% This is similar to the analysis done by higher-order specialization, except
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% that here, we do care if a higher-order variable can take multiple values.
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%
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%-----------------------------------------------------------------------------%
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:- module transform_hlds.closure_analysis.
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:- interface.
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:- import_module hlds.
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:- import_module hlds.hlds_module.
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:- import_module io.
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:- pred closure_analyse_module(io.text_output_stream::in,
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module_info::in, module_info::out) is det.
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%----------------------------------------------------------------------------%
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%----------------------------------------------------------------------------%
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:- implementation.
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:- import_module hlds.hlds_dependency_graph.
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:- import_module hlds.hlds_goal.
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:- import_module hlds.hlds_pred.
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:- import_module hlds.mode_test.
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:- import_module hlds.passes_aux.
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:- import_module libs.
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:- import_module libs.dependency_graph.
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:- import_module libs.globals.
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:- import_module libs.options.
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:- import_module parse_tree.
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:- import_module parse_tree.parse_tree_out_misc.
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:- import_module parse_tree.prog_data.
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:- import_module parse_tree.prog_data_foreign.
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:- import_module parse_tree.prog_type_test.
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:- import_module parse_tree.set_of_var.
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:- import_module parse_tree.var_table.
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:- import_module bool.
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:- import_module list.
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:- import_module map.
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:- import_module maybe.
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:- import_module pair.
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:- import_module require.
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:- import_module set.
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:- import_module string.
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%----------------------------------------------------------------------------%
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closure_analyse_module(ProgressStream, !ModuleInfo) :-
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% XXX At the moment it is not necessary to do this on a per-SCC basis,
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% since the analysis is only procedure-local, but we would eventually
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% like to extend it.
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module_info_get_globals(!.ModuleInfo, Globals),
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globals.lookup_bool_option(Globals, debug_closure, Debug),
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module_info_ensure_dependency_info(!ModuleInfo, DepInfo),
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SCCs = dependency_info_get_bottom_up_sccs(DepInfo),
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list.foldl(closure_analyse_scc(ProgressStream, Debug), SCCs, !ModuleInfo).
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%----------------------------------------------------------------------------%
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%
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% Perform closure analysis on an SCC.
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%
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:- pred closure_analyse_scc(io.text_output_stream::in, bool::in, scc::in,
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module_info::in, module_info::out) is det.
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closure_analyse_scc(ProgressStream, Debug, SCC, !ModuleInfo) :-
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set.foldl(closure_analyse_proc(ProgressStream, Debug), SCC, !ModuleInfo).
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%----------------------------------------------------------------------------%
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% This type represents the possible values of a higher-order valued
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% variable.
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%
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:- type closure_values
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---> unknown
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% The higher-order variable may be bound to something,
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% but we don't know what it is.
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; partial(set(pred_proc_id))
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% The higher-order variable may be bound to these values,
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% or it may be bound to something else we don't know about.
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% (This is intended to be useful in producing error messages
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% for the termination analysis; if one of the higher-order values
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% is definitely non-terminating, we can certainly let the user
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% know about it.)
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; exclusive(set(pred_proc_id)).
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% The higher-order variable can be bound only to one of the
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% procedures identified by this set.
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% We attach a closure_info to each goal where it may be of interest;
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% at the moment calls and generic_calls.
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%
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:- type closure_info == map(prog_var, closure_values).
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%----------------------------------------------------------------------------%
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:- func closure_info_init(module_info, var_table,
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list(prog_var), list(mer_mode)) = closure_info.
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closure_info_init(ModuleInfo, VarTable, HeadVars, ArgModes) = ClosureInfo :-
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partition_higher_order_arguments(ModuleInfo, VarTable, HeadVars, ArgModes,
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set_of_var.init, Inputs0, set_of_var.init, _Outputs),
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Inputs = set_of_var.filter(var_has_ho_type(VarTable), Inputs0),
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set_of_var.fold(insert_unknown, Inputs, map.init, ClosureInfo).
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% Succeeds iff the given variable has a higher-order type.
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%
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:- pred var_has_ho_type(var_table::in, prog_var::in) is semidet.
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var_has_ho_type(VarTable, Var) :-
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lookup_var_type(VarTable, Var, Type),
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type_is_higher_order(Type).
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% Insert the given prog_var into the closure_info, and set the
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% possible values to unknown.
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%
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:- pred insert_unknown(prog_var::in, closure_info::in, closure_info::out)
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is det.
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insert_unknown(Var, !ClosureInfo) :-
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map.det_insert(Var, unknown, !ClosureInfo).
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%----------------------------------------------------------------------------%
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%
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% Perform local closure analysis on a procedure.
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%
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:- pred closure_analyse_proc(io.text_output_stream::in, bool::in,
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pred_proc_id::in, module_info::in, module_info::out) is det.
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closure_analyse_proc(ProgressStream, Debug, PPId, !ModuleInfo) :-
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module_info_pred_proc_info(!.ModuleInfo, PPId, PredInfo, ProcInfo0),
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proc_info_get_headvars(ProcInfo0, HeadVars),
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proc_info_get_var_table(ProcInfo0, VarTable),
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proc_info_get_argmodes(ProcInfo0, ArgModes),
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ClosureInfo0 = closure_info_init(!.ModuleInfo, VarTable, HeadVars,
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ArgModes),
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trace [io(!TIO)] (
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maybe_write_proc_progress_message(ProgressStream, !.ModuleInfo,
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"Analysing closures in", PPId, !TIO)
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),
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proc_info_get_goal(ProcInfo0, BodyGoal0),
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closure_analyse_goal(!.ModuleInfo, VarTable, BodyGoal0, BodyGoal,
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ClosureInfo0, _ClosureInfo),
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(
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Debug = yes,
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trace [io(!IO)] (
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get_debug_output_stream(!.ModuleInfo, DebugStream, !IO),
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dump_closure_info(DebugStream, VarTable, BodyGoal, !IO),
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io.flush_output(DebugStream, !IO)
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)
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;
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Debug = no
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),
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proc_info_set_goal(BodyGoal, ProcInfo0, ProcInfo),
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module_info_set_pred_proc_info(PPId, PredInfo, ProcInfo, !ModuleInfo).
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%-----------------------------------------------------------------------------%
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%
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% Track higher-order values through goals.
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%
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:- pred closure_analyse_goal(module_info::in, var_table::in,
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hlds_goal::in, hlds_goal::out, closure_info::in, closure_info::out) is det.
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closure_analyse_goal(ModuleInfo, VarTable, Goal0, Goal, !ClosureInfo) :-
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Goal0 = hlds_goal(GoalExpr0, GoalInfo0),
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(
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GoalExpr0 = conj(ConjType, Goals0),
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list.map_foldl(closure_analyse_goal(ModuleInfo, VarTable),
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Goals0, Goals, !ClosureInfo),
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GoalExpr = conj(ConjType, Goals),
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Goal = hlds_goal(GoalExpr, GoalInfo0)
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;
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GoalExpr0 = plain_call(CallPredId, CallProcId, CallArgs, _, _, _),
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% Look for any higher-order arguments and divide them
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% into sets of input and output arguments.
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module_info_pred_proc_info(ModuleInfo, CallPredId, CallProcId,
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_CallPredInfo, CallProcInfo),
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proc_info_get_argmodes(CallProcInfo, CallArgModes),
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% NOTE: We construct sets of arguments, rather than lists,
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% in case there are duplicate arguments.
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partition_higher_order_arguments(ModuleInfo, VarTable,
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CallArgs, CallArgModes,
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set_of_var.init, InputArgs, set_of_var.init, OutputArgs),
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% Update the goal_info to include any information about the
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% values of higher-order valued variables.
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set_of_var.fold(add_any_exclusive_ho_values(!.ClosureInfo), InputArgs,
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map.init, HoValueMap),
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goal_info_set_higher_order_value_map(HoValueMap, GoalInfo0, GoalInfo),
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% Insert any information about higher-order outputs from this call
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% into the closure_info.
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set_of_var.fold(insert_unknown, OutputArgs, !ClosureInfo),
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Goal = hlds_goal(GoalExpr0, GoalInfo)
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;
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GoalExpr0 = generic_call(GenericDetails, GCallArgs, GCallModes, _, _),
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partition_higher_order_arguments(ModuleInfo, VarTable,
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GCallArgs, GCallModes,
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set_of_var.init, InputArgs0, set_of_var.init, OutputArgs),
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% For higher-order calls we need to make sure that the actual
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% higher-order variable being called is also considered (it will
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% typically be the variable of interest). This variable is not included
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% in 'GCallArgs' so we need to include in the set of input argument
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% separately.
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(
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GenericDetails = higher_order(CalledClosure0, _, _, _, _),
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set_of_var.insert(CalledClosure0, InputArgs0, InputArgs)
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;
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( GenericDetails = class_method(_, _, _, _)
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; GenericDetails = event_call(_)
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; GenericDetails = cast(_)
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),
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InputArgs = InputArgs0
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),
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% The closure_info won't yet contain any information about
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% higher-order outputs from this call.
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set_of_var.fold(add_any_exclusive_ho_values(!.ClosureInfo), InputArgs,
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map.init, HoValueMap),
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goal_info_set_higher_order_value_map(HoValueMap, GoalInfo0, GoalInfo),
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% Insert any information about higher-order outputs from this call
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% into the closure_info.
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set_of_var.fold(insert_unknown, OutputArgs, !ClosureInfo),
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Goal = hlds_goal(GoalExpr0, GoalInfo)
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;
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GoalExpr0 = switch(SwitchVar, SwitchCanFail, Cases0),
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closure_analyse_cases(ModuleInfo, VarTable, Cases0, Cases,
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!.ClosureInfo, map.init, !:ClosureInfo),
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GoalExpr = switch(SwitchVar, SwitchCanFail, Cases),
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Goal = hlds_goal(GoalExpr, GoalInfo0)
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;
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GoalExpr0 = unify(_, _, _, Unification, _),
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(
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Unification = construct(LHS, RHS, _, _, _, _, _),
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( if RHS = closure_cons(ShroudedPPId) then
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PPId = unshroud_pred_proc_id(ShroudedPPId),
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HO_Value = set.make_singleton_set(PPId),
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map.det_insert(LHS, exclusive(HO_Value), !ClosureInfo)
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else
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true
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)
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;
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Unification = deconstruct(_, _, Args, _, _, _),
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% XXX We don't currently support tracking the values of closures
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% that are stored in data structures.
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HO_Args = list.filter(var_has_ho_type(VarTable), Args),
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list.foldl(insert_unknown, HO_Args, !ClosureInfo)
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;
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Unification = assign(LHS, RHS),
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( if var_has_ho_type(VarTable, LHS) then
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% Sanity check: make sure the rhs is also a higher-order
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% variable.
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( if var_has_ho_type(VarTable, RHS) then
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true
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else
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unexpected($pred, "not a higher-order var")
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),
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Values = map.lookup(!.ClosureInfo, RHS),
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map.det_insert(LHS, Values, !ClosureInfo)
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else
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true
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)
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;
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Unification = simple_test(_, _)
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;
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Unification = complicated_unify(_, _, _)
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),
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Goal = Goal0
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;
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GoalExpr0 = disj(Goals0),
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closure_analyse_disjuncts(ModuleInfo, VarTable, Goals0, Goals,
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!.ClosureInfo, map.init, !:ClosureInfo),
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GoalExpr = disj(Goals),
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Goal = hlds_goal(GoalExpr, GoalInfo0)
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;
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GoalExpr0 = negation(NegatedGoal0),
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closure_analyse_goal(ModuleInfo, VarTable, NegatedGoal0, NegatedGoal,
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!.ClosureInfo, _),
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GoalExpr = negation(NegatedGoal),
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Goal = hlds_goal(GoalExpr, GoalInfo0)
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;
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GoalExpr0 = scope(Reason, SubGoal0),
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( if
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Reason = from_ground_term(_, FGT),
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( FGT = from_ground_term_construct
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; FGT = from_ground_term_deconstruct
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)
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then
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SubGoal = SubGoal0
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else
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closure_analyse_goal(ModuleInfo, VarTable,
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SubGoal0, SubGoal, !ClosureInfo)
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),
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GoalExpr = scope(Reason, SubGoal),
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Goal = hlds_goal(GoalExpr, GoalInfo0)
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;
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GoalExpr0 = if_then_else(ExistQVars, Cond0, Then0, Else0),
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closure_analyse_goal(ModuleInfo, VarTable, Cond0, Cond,
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!.ClosureInfo, CondInfo),
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closure_analyse_goal(ModuleInfo, VarTable, Then0, Then,
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CondInfo, CondThenInfo),
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closure_analyse_goal(ModuleInfo, VarTable, Else0, Else,
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!.ClosureInfo, ElseInfo),
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map.union(merge_closure_values, CondThenInfo, ElseInfo, !:ClosureInfo),
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GoalExpr = if_then_else(ExistQVars, Cond, Then, Else),
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Goal = hlds_goal(GoalExpr, GoalInfo0)
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;
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GoalExpr0 = call_foreign_proc(_, _, _, Args, _ExtraArgs, _, _),
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% XXX We may eventually want to annotate foreign_procs with
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% clousure_infos as well. It isn't useful at the moment however.
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ForeignHOArgs =
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( pred(Arg::in, Out::out) is semidet :-
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Arg = foreign_arg(Var, NameMode, Type, _BoxPolicy),
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% A 'no' here means that the foreign argument is unused.
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NameMode = yes(foreign_arg_name_mode(_, Mode)),
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mode_is_output(ModuleInfo, Mode),
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type_is_higher_order(Type),
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Out = Var - unknown
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),
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list.filter_map(ForeignHOArgs, Args, OutputForeignHOArgs),
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map.det_insert_from_assoc_list(OutputForeignHOArgs, !ClosureInfo),
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Goal = Goal0
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;
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GoalExpr0 = shorthand(_),
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unexpected($pred, "shorthand")
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).
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:- pred closure_analyse_disjuncts(module_info::in, var_table::in,
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list(hlds_goal)::in, list(hlds_goal)::out,
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closure_info::in, closure_info::in, closure_info::out) is det.
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closure_analyse_disjuncts(_, _, [], [], _, !MergedDisjunctClosureInfo).
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closure_analyse_disjuncts(ModuleInfo, VarTable,
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[Disjunct0 | Disjuncts0], [Disjunct | Disjuncts],
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ClosureInfo0, !MergedDisjunctClosureInfo) :-
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closure_analyse_goal(ModuleInfo, VarTable, Disjunct0, Disjunct,
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ClosureInfo0, DisjunctClosureInfo),
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merge_closure_infos(DisjunctClosureInfo, !MergedDisjunctClosureInfo),
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closure_analyse_disjuncts(ModuleInfo, VarTable, Disjuncts0, Disjuncts,
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ClosureInfo0, !MergedDisjunctClosureInfo).
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:- pred closure_analyse_cases(module_info::in, var_table::in,
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list(case)::in, list(case)::out,
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closure_info::in, closure_info::in, closure_info::out) is det.
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closure_analyse_cases(_, _, [], [], _, !MergedCaseClosureInfo).
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closure_analyse_cases(ModuleInfo, VarTable, [Case0 | Cases0], [Case | Cases],
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ClosureInfo0, !MergedCaseClosureInfo) :-
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closure_analyse_case(ModuleInfo, VarTable, Case0, Case,
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ClosureInfo0, CaseClosureInfo),
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merge_closure_infos(CaseClosureInfo, !MergedCaseClosureInfo),
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closure_analyse_cases(ModuleInfo, VarTable, Cases0, Cases,
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ClosureInfo0, !MergedCaseClosureInfo).
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:- pred closure_analyse_case(module_info::in, var_table::in,
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case::in, case::out, closure_info::in, closure_info::out) is det.
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closure_analyse_case(ModuleInfo, VarTable, Case0, Case,
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ClosureInfo0, CaseClosureInfo) :-
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Case0 = case(MainConsId, OtherConsIds, CaseGoal0),
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closure_analyse_goal(ModuleInfo, VarTable, CaseGoal0, CaseGoal,
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ClosureInfo0, CaseClosureInfo),
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Case = case(MainConsId, OtherConsIds, CaseGoal).
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:- pred add_any_exclusive_ho_values(closure_info::in, prog_var::in,
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higher_order_value_map::in, higher_order_value_map::out) is det.
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add_any_exclusive_ho_values(ClosureInfo, Var, !HoValueMap) :-
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( if map.search(ClosureInfo, Var, PossibleValues) then
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(
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PossibleValues = unknown
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;
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PossibleValues = partial(_)
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;
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PossibleValues = exclusive(KnownValues),
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map.det_insert(Var, KnownValues, !HoValueMap)
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)
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else
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true
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).
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%----------------------------------------------------------------------------%
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:- pred partition_higher_order_arguments(module_info::in, var_table::in,
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list(prog_var)::in, list(mer_mode)::in,
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set_of_progvar::in, set_of_progvar::out,
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set_of_progvar::in, set_of_progvar::out) is det.
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partition_higher_order_arguments(_, _, [], [], !Inputs, !Outputs).
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partition_higher_order_arguments(_, _, [_ | _], [], _, _, _, _) :-
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unexpected($pred, "unequal length lists.").
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partition_higher_order_arguments(_, _, [], [_ | _], _, _, _, _) :-
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unexpected($pred, "unequal length lists.").
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partition_higher_order_arguments(ModuleInfo, VarTable,
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[Var | Vars], [Mode | Modes], !Inputs, !Outputs) :-
|
|
( if var_has_ho_type(VarTable, Var) then
|
|
( if mode_is_input(ModuleInfo, Mode) then
|
|
set_of_var.insert(Var, !Inputs)
|
|
else if mode_is_output(ModuleInfo, Mode) then
|
|
set_of_var.insert(Var, !Outputs)
|
|
else
|
|
true
|
|
)
|
|
else
|
|
true
|
|
),
|
|
partition_higher_order_arguments(ModuleInfo, VarTable, Vars, Modes,
|
|
!Inputs, !Outputs).
|
|
|
|
:- pred merge_closure_infos(closure_info::in, closure_info::in,
|
|
closure_info::out) is det.
|
|
|
|
merge_closure_infos(A, B, C) :-
|
|
map.union(merge_closure_values, A, B, C).
|
|
|
|
:- pred merge_closure_values(closure_values::in, closure_values::in,
|
|
closure_values::out) is det.
|
|
|
|
merge_closure_values(unknown, unknown, unknown).
|
|
merge_closure_values(unknown, partial(A), partial(A)).
|
|
merge_closure_values(unknown, exclusive(A), partial(A)).
|
|
merge_closure_values(partial(A), unknown, partial(A)).
|
|
merge_closure_values(partial(A), partial(B), partial(A `set.union` B)).
|
|
merge_closure_values(partial(A), exclusive(B), partial(A `set.union` B)).
|
|
merge_closure_values(exclusive(A), unknown, partial(A)).
|
|
merge_closure_values(exclusive(A), partial(B), partial(A `set.union` B)).
|
|
merge_closure_values(exclusive(A), exclusive(B), exclusive(A `set.union` B)).
|
|
|
|
%----------------------------------------------------------------------------%
|
|
%
|
|
% Debugging code, used if the '--debug-closure' option is given.
|
|
%
|
|
|
|
:- pred dump_closure_info(io.text_output_stream::in, var_table::in,
|
|
hlds_goal::in, io::di, io::uo) is det.
|
|
|
|
dump_closure_info(DebugStream, VarTable, Goal, !IO) :-
|
|
% XXX zs: It seems to me that the output from this predicate
|
|
% would be much easier to understand if each piece of the output
|
|
% was preceded by the identity of the goal that it came from.
|
|
Goal = hlds_goal(GoalExpr, GoalInfo),
|
|
(
|
|
GoalExpr = unify(_, _, _, _, _)
|
|
;
|
|
GoalExpr = plain_call(_, _, _, _, _, _),
|
|
dump_ho_values(DebugStream, VarTable, GoalInfo, !IO)
|
|
;
|
|
GoalExpr = generic_call(_, _, _, _, _),
|
|
dump_ho_values(DebugStream, VarTable, GoalInfo, !IO)
|
|
;
|
|
GoalExpr = call_foreign_proc(_, _, _, _, _, _, _)
|
|
;
|
|
GoalExpr = conj(_ConjType, SubGoals),
|
|
list.foldl(dump_closure_info(DebugStream, VarTable), SubGoals, !IO)
|
|
;
|
|
GoalExpr = disj(SubGoals),
|
|
list.foldl(dump_closure_info(DebugStream, VarTable), SubGoals, !IO)
|
|
;
|
|
GoalExpr = switch(_, _, Cases),
|
|
SubGoals = list.map((func(case(_, _, CaseGoal)) = CaseGoal), Cases),
|
|
list.foldl(dump_closure_info(DebugStream, VarTable), SubGoals, !IO)
|
|
;
|
|
GoalExpr = if_then_else(_, CondGoal, ThenGoal, ElseGoal),
|
|
dump_closure_info(DebugStream, VarTable, CondGoal, !IO),
|
|
dump_closure_info(DebugStream, VarTable, ThenGoal, !IO),
|
|
dump_closure_info(DebugStream, VarTable, ElseGoal, !IO)
|
|
;
|
|
GoalExpr = negation(SubGoal),
|
|
dump_closure_info(DebugStream, VarTable, SubGoal, !IO)
|
|
;
|
|
GoalExpr = scope(_, SubGoal),
|
|
dump_closure_info(DebugStream, VarTable, SubGoal, !IO)
|
|
;
|
|
GoalExpr = shorthand(_),
|
|
unexpected($pred, "shorthand")
|
|
).
|
|
|
|
:- pred dump_ho_values(io.text_output_stream::in, var_table::in,
|
|
hlds_goal_info::in, io::di, io::uo) is det.
|
|
|
|
dump_ho_values(DebugStream, VarTable, GoalInfo, !IO) :-
|
|
HoValueMap = goal_info_get_higher_order_value_map(GoalInfo),
|
|
( if map.is_empty(HoValueMap) then
|
|
true
|
|
else
|
|
Context = goal_info_get_context(GoalInfo),
|
|
parse_tree_out_misc.write_context(DebugStream, Context, !IO),
|
|
io.nl(DebugStream, !IO),
|
|
map.foldl(dump_ho_value_map_entry(DebugStream, VarTable),
|
|
HoValueMap, !IO)
|
|
).
|
|
|
|
:- pred dump_ho_value_map_entry(io.text_output_stream::in, var_table::in,
|
|
prog_var::in, set(pred_proc_id)::in, io::di, io::uo) is det.
|
|
|
|
dump_ho_value_map_entry(DebugStream, VarTable, Var, Values, !IO) :-
|
|
VarName = var_table_entry_name(VarTable, Var),
|
|
io.format(DebugStream, "%s =\n", [s(VarName)], !IO),
|
|
WritePPIds =
|
|
( pred(PPId::in, !.IO::di, !:IO::uo) is det :-
|
|
io.write_string(DebugStream, "\t", !IO),
|
|
io.write_line(DebugStream, PPId, !IO)
|
|
),
|
|
set.fold(WritePPIds, Values, !IO).
|
|
|
|
%----------------------------------------------------------------------------%
|
|
:- end_module transform_hlds.closure_analysis.
|
|
%----------------------------------------------------------------------------%
|