%-----------------------------------------------------------------------------% % vim: ft=mercury ts=4 sw=4 et %-----------------------------------------------------------------------------% % Copyright (C) 2014 The Mercury team. % This file may only be copied under the terms of the GNU General % Public License - see the file COPYING in the Mercury distribution. %-----------------------------------------------------------------------------% % % File: simplify_proc.m. % % This module handles top level invocations of simplification. % % Most such invocations simplify the body of a procedure, or the bodies % of all the procedures in a predicate. However, in some cases some other % compiler passes (such as deforestation or partial evaluation) want to % simplify a goal that is not the body of a procedure. % %-----------------------------------------------------------------------------% :- module check_hlds.simplify.simplify_proc. :- interface. :- import_module check_hlds.simplify.simplify_tasks. :- import_module hlds. :- import_module hlds.hlds_goal. :- import_module hlds.hlds_module. :- import_module hlds.hlds_pred. :- import_module hlds.instmap. :- import_module parse_tree. :- import_module parse_tree.error_util. :- import_module io. :- import_module list. :- import_module maybe. %-----------------------------------------------------------------------------% % Simplify all the given procedures of the given predicate. % Add any resulting messages to the error spec accumulator. % % Used by mercury_compiler_front_end.m when doing compilation pass-by-pass. % :- pred simplify_pred_procs(maybe(io.text_output_stream)::in, simplify_tasks::in, pred_id::in, list(proc_id)::in, module_info::in, module_info::out, pred_info::in, pred_info::out, error_spec_accumulator::in, error_spec_accumulator::out) is det. % Simplify the given procedure. Throw away any resulting error messages. % % Used by compiler passes after the front end that need (or maybe just % want) to eliminate unnecessary parts of the procedure. % :- pred simplify_proc(maybe(io.text_output_stream)::in, simplify_tasks::in, pred_id::in, proc_id::in, module_info::in, module_info::out, proc_info::in, proc_info::out) is det. % simplify_goal_update_vars_in_proc(SimplifyTasks, !ModuleInfo, % PredId, ProcId, !ProcInfo, InstMap0, !Goal, CostDelta): % % Perform the specified simplification tasks on !Goal, which should be % part of the procedure identified by PredId and ProcId. InstMap0 % should be the instmap immediately before !.Goal. % % We may update !ModuleInfo during the course of updating instmaps % to reflect any changes made to the code. If the modifications to !Goal % add any new variables, add these to !ProcInfo. % % !.Goal does NOT need to be the entire body of the procedure it appears % in; it can be just a part of it. This is why we return the updated goal % in !:Goal, not in !:ProcInfo. % % Used by partial evaluation. % :- pred simplify_goal_update_vars_in_proc(simplify_tasks::in, module_info::in, module_info::out, pred_id::in, proc_id::in, proc_info::in, proc_info::out, instmap::in, hlds_goal::in, hlds_goal::out, int::out) is det. %-----------------------------------------------------------------------------% %-----------------------------------------------------------------------------% :- implementation. :- import_module check_hlds.det_analysis. :- import_module check_hlds.det_util. :- import_module check_hlds.recompute_instmap_deltas. :- import_module check_hlds.simplify.common. :- import_module check_hlds.simplify.format_call. :- import_module check_hlds.simplify.simplify_goal. :- import_module check_hlds.simplify.simplify_info. :- import_module hlds.code_model. :- import_module hlds.passes_aux. :- import_module hlds.quantification. :- import_module hlds.status. :- import_module libs. :- import_module libs.globals. :- import_module libs.optimization_options. :- import_module libs.options. :- import_module mdbcomp. :- import_module mdbcomp.sym_name. :- import_module parse_tree.error_spec. :- import_module parse_tree.prog_data. :- import_module parse_tree.prog_data_foreign. :- import_module parse_tree.var_table. :- import_module transform_hlds. :- import_module transform_hlds.direct_arg_in_out. :- import_module bool. :- import_module int. :- import_module map. :- import_module require. :- import_module set. :- import_module string. :- import_module varset. %-----------------------------------------------------------------------------% simplify_pred_procs(_, _, _, [], !ModuleInfo, !PredInfo, !Specs). simplify_pred_procs(MaybeProgressStream, SimplifyTasks, PredId, [ProcId | ProcIds], !ModuleInfo, !PredInfo, !Specs) :- simplify_pred_proc(MaybeProgressStream, SimplifyTasks, PredId, ProcId, !ModuleInfo, !PredInfo, !Specs), simplify_pred_procs(MaybeProgressStream, SimplifyTasks, PredId, ProcIds, !ModuleInfo, !PredInfo, !Specs). :- pred simplify_pred_proc(maybe(io.text_output_stream)::in, simplify_tasks::in, pred_id::in, proc_id::in, module_info::in, module_info::out, pred_info::in, pred_info::out, error_spec_accumulator::in, error_spec_accumulator::out) is det. simplify_pred_proc(_MaybeProgressStream, SimplifyTasks, PredId, ProcId, !ModuleInfo, !PredInfo, !Specs) :- % XXX It is strange that simplify_proc prints progress messages, % but simplify_pred_proc does not. pred_info_get_proc_table(!.PredInfo, ProcTable0), map.lookup(ProcTable0, ProcId, ProcInfo0), simplify_proc_return_msgs(SimplifyTasks, PredId, ProcId, !ModuleInfo, ProcInfo0, ProcInfo, ProcSpecs), % This is ugly, but we want to avoid running the dependent parallel % conjunction pass on predicates and even modules that do not contain % parallel conjunctions (nearly all of them). Since simplification % is always done, we use it to mark modules and procedures containing % parallel conjunctions. proc_info_get_has_parallel_conj(ProcInfo, HasParallelConj), ( HasParallelConj = has_parallel_conj, module_info_set_has_parallel_conj(!ModuleInfo) ; HasParallelConj = has_no_parallel_conj ), proc_info_get_has_user_event(ProcInfo, HasUserEvent), ( HasUserEvent = has_user_event, module_info_set_has_user_event(!ModuleInfo) ; HasUserEvent = has_no_user_event ), map.det_update(ProcId, ProcInfo, ProcTable0, ProcTable), pred_info_set_proc_table(ProcTable, !PredInfo), accumulate_error_specs_for_proc(ProcSpecs, !Specs). simplify_proc(MaybeProgressStream, SimplifyTasks, PredId, ProcId, !ModuleInfo, !ProcInfo) :- trace [io(!IO)] ( ( MaybeProgressStream = no ; MaybeProgressStream = yes(ProgressStream), maybe_write_pred_progress_message(ProgressStream, !.ModuleInfo, "Simplifying", PredId, !IO) ) ), simplify_proc_return_msgs(SimplifyTasks, PredId, ProcId, !ModuleInfo, !ProcInfo, _). simplify_goal_update_vars_in_proc(SimplifyTasks, !ModuleInfo, PredId, ProcId, !ProcInfo, InstMap0, !Goal, CostDelta) :- simplify_info_init(!.ModuleInfo, PredId, ProcId, !.ProcInfo, SimplifyTasks, SimplifyInfo0), % The nested context we construct is probably a lie; we don't actually % know whether we are inside a goal duplicated for a switch, or a lambda, % or a model_non procedure. However, this should be ok. The nested context % is used for deciding what warnings and errors to generate, and % we are not interested in those. InsideDuplForSwitch = no, NumEnclosingBarriers = 0u, ProcIsModelNon = no, NestedContext0 = simplify_nested_context(InsideDuplForSwitch, ProcIsModelNon, NumEnclosingBarriers), simplify_top_level_goal(!Goal, NestedContext0, InstMap0, SimplifyInfo0, SimplifyInfo), simplify_info_get_module_info(SimplifyInfo, !:ModuleInfo), simplify_info_get_var_table(SimplifyInfo, VarTable), simplify_info_get_rtti_varmaps(SimplifyInfo, RttiVarMaps), proc_info_set_var_table(VarTable, !ProcInfo), proc_info_set_rtti_varmaps(RttiVarMaps, !ProcInfo), simplify_info_get_cost_delta(SimplifyInfo, CostDelta). %-----------------------------------------------------------------------------% % Simplify the given procedure. Return the resulting error messages. % :- pred simplify_proc_return_msgs(simplify_tasks::in, pred_id::in, proc_id::in, module_info::in, module_info::out, proc_info::in, proc_info::out, list(error_spec)::out) is det. simplify_proc_return_msgs(SimplifyTasks0, PredId, ProcId, !ModuleInfo, !ProcInfo, !:Specs) :- simplify_proc_maybe_vary_parameters(!.ModuleInfo, PredId, !.ProcInfo, SimplifyTasks0, SimplifyTasks), module_info_pred_info(!.ModuleInfo, PredId, PredInfo0), pred_info_get_markers(PredInfo0, Markers0), ( if check_marker(Markers0, marker_mode_check_clauses) then simplify_proc_maybe_mark_modecheck_clauses(!ProcInfo) else true ), % We must invoke analyze_and_optimize_format_calls before % simplify_top_level_goal, for two reasons. % % First, excess assignment optimization may delete some of the % unifications that build the format strings or values, % which means that the goal it generates may not contain the % information that analyze_and_optimize_format_calls needs to avoid % spurious messages about unknown format strings or values. % % Second, analyze_and_optimize_format_calls generates nested % conjunctions, which simplify_top_level_goal can eliminate. % % We therefore get determinism analysis to mark the procedure % if its body contains any calls relevant to format_calls.m. ( if check_marker(Markers0, marker_has_format_call), SimplifyTasks ^ do_invoke_format_call = invoke_format_call then ( SimplifyTasks ^ do_warn_implicit_streams = do_not_warn_implicit_streams, ImplicitStreamWarnings = do_not_generate_implicit_stream_warnings ; SimplifyTasks ^ do_warn_implicit_streams = warn_implicit_streams, ImplicitStreamWarnings = generate_implicit_stream_warnings ), simplify_proc_analyze_and_format_calls(!ModuleInfo, PredId, PredInfo0, ProcId, !ProcInfo, ImplicitStreamWarnings, FormatSpecs) else % Either there are no format calls to check, or we don't want to % optimize them and would ignore the added messages anyway. FormatSpecs = [] ), simplify_info_init(!.ModuleInfo, PredId, ProcId, !.ProcInfo, SimplifyTasks, Info0), InsideDuplForSwitch = no, NumEnclosingBarriers = 0u, CodeModel = proc_info_interface_code_model(!.ProcInfo), ( ( CodeModel = model_det ; CodeModel = model_semi ), ProcIsModelNon = no ; CodeModel = model_non, ProcIsModelNon = yes(imp_whole_proc) ), NestedContext0 = simplify_nested_context(InsideDuplForSwitch, ProcIsModelNon, NumEnclosingBarriers), proc_info_get_initial_instmap(!.ModuleInfo, !.ProcInfo, InstMap0), proc_info_get_goal(!.ProcInfo, Goal0), simplify_top_level_goal(Goal0, Goal, NestedContext0, InstMap0, Info0, Info), proc_info_set_goal(Goal, !ProcInfo), simplify_info_get_var_table(Info, VarTable0), simplify_info_get_rtti_varmaps(Info, RttiVarMaps), simplify_info_get_elim_vars(Info, ElimVarsLists0), % We sort the lists basically on the number of the first variable. list.sort(ElimVarsLists0, ElimVarsLists), list.condense(ElimVarsLists, ElimVars), delete_var_entries(ElimVars, VarTable0, VarTable1), simplify_info_get_module_info(Info, !:ModuleInfo), % We only eliminate vars that cannot occur in RttiVarMaps. ( if simplify_do_after_front_end(Info) then proc_info_get_var_name_remap(!.ProcInfo, VarNameRemap), RenameVar = ( pred(V::in, N::in, VT0::in, VT::out) is det :- lookup_var_entry(VT0, V, E0), E = E0 ^ vte_name := N, update_var_entry(V, E, VT0, VT) ), map.foldl(RenameVar, VarNameRemap, VarTable1, VarTable), proc_info_set_var_name_remap(map.init, !ProcInfo), proc_info_get_headvars(!.ProcInfo, HeadVars), proc_info_get_argmodes(!.ProcInfo, ArgModes), find_and_record_any_direct_arg_in_out_posns(PredId, ProcId, VarTable, HeadVars, ArgModes, !ModuleInfo) else VarTable = VarTable1 ), proc_info_set_var_table(VarTable, !ProcInfo), proc_info_set_rtti_varmaps(RttiVarMaps, !ProcInfo), simplify_info_get_has_parallel_conj(Info, HasParallelConj), proc_info_set_has_parallel_conj(HasParallelConj, !ProcInfo), simplify_info_get_has_user_event(Info, HasUserEvent), proc_info_set_has_user_event(HasUserEvent, !ProcInfo), simplify_info_get_deleted_call_callees(Info, CurDeletedCallCallees), proc_info_get_deleted_call_callees(!.ProcInfo, DeletedCallCallees0), set.union(CurDeletedCallCallees, DeletedCallCallees0, DeletedCallCallees), proc_info_set_deleted_call_callees(DeletedCallCallees, !ProcInfo), simplify_info_get_error_specs(Info, !:Specs), !:Specs = FormatSpecs ++ !.Specs, simplify_proc_maybe_warn_attribute_conflict(!.ModuleInfo, PredId, !.ProcInfo, !Specs), pred_info_get_status(PredInfo0, Status), IsDefinedHere = pred_status_defined_in_this_module(Status), ( IsDefinedHere = no, % Don't generate any warnings or even errors if the predicate isn't % defined here; any such messages will be generated when we compile % the module the predicate comes from. !:Specs = [] ; IsDefinedHere = yes ). :- pred simplify_proc_maybe_vary_parameters(module_info::in, pred_id::in, proc_info::in, simplify_tasks::in, simplify_tasks::out) is det. simplify_proc_maybe_vary_parameters(ModuleInfo, PredId, ProcInfo, !SimplifyTasks) :- module_info_get_globals(ModuleInfo, Globals), globals.lookup_string_option(Globals, common_struct_preds, CommonStructPreds), ( if CommonStructPreds = "" then TurnOffCommonStructByRequest = no else CommonStructPredIdStrs = string.split_at_char(',', CommonStructPreds), ( if list.map(string.to_int, CommonStructPredIdStrs, CommonStructPredIdInts) then PredIdInt = pred_id_to_int(PredId), ( if list.member(PredIdInt, CommonStructPredIdInts) then TurnOffCommonStructByRequest = no else TurnOffCommonStructByRequest = yes ) else TurnOffCommonStructByRequest = no ) ), proc_info_get_var_table(ProcInfo, VarTable0), var_table_count(VarTable0, NumVars), ( if ( TurnOffCommonStructByRequest = yes ; NumVars > turn_off_common_struct_threshold ) then !SimplifyTasks ^ do_opt_common_structs := do_not_opt_common_structs else true ). % If we have too many variables, common_struct used to take so long that % either the compiler runs out of memory, or the user runs out of patience. % In such cases, the fact that we would generate better code if the % compilation finished is therefore of limited interest. % % However, since this limit was first imposed, we have optimized % the compiler's infrastructure for such things, e.g. by using much more % compact representations for sets of variables, which permit much faster % operations on them. These changes do not eliminate the danger described % above completely, but they do raise the threshold at which they can % appear. % % As of 2020 october 11, the code of convert_options_to_globals in % handle_options.m has just shy of 9,000 variables at the time of the % first simplify pass (HLDS dump stage 65). The compiler can handle that % easily, so the setting below allows for some growth. % :- func turn_off_common_struct_threshold = int. turn_off_common_struct_threshold = 12000. :- pred simplify_proc_maybe_mark_modecheck_clauses( proc_info::in, proc_info::out) is det. simplify_proc_maybe_mark_modecheck_clauses(!ProcInfo) :- proc_info_get_goal(!.ProcInfo, Goal0), Goal0 = hlds_goal(GoalExpr0, GoalInfo0), ( if ( GoalExpr0 = disj(_) ; GoalExpr0 = switch(_, _, _) ) then goal_info_add_feature(feature_mode_check_clauses_goal, GoalInfo0, GoalInfo), Goal = hlds_goal(GoalExpr0, GoalInfo), proc_info_set_goal(Goal, !ProcInfo) else true ). %-----------------------------------------------------------------------------% :- pred simplify_proc_analyze_and_format_calls( module_info::in, module_info::out, pred_id::in, pred_info::in, proc_id::in, proc_info::in, proc_info::out, maybe_generate_implicit_stream_warnings::in, list(error_spec)::out) is det. simplify_proc_analyze_and_format_calls(!ModuleInfo, PredId, PredInfo0, ProcId, !ProcInfo, ImplicitStreamWarnings, FormatSpecs) :- proc_info_get_goal(!.ProcInfo, Goal0), proc_info_get_var_table(!.ProcInfo, VarTable0), analyze_and_optimize_format_calls(!.ModuleInfo, PredInfo0, !.ProcInfo, ImplicitStreamWarnings, Goal0, MaybeGoal, FormatSpecs, VarTable0, VarTable), ( MaybeGoal = yes(Goal), proc_info_set_goal(Goal, !ProcInfo), proc_info_set_var_table(VarTable, !ProcInfo), % The goals we replace format calls with are created with the % correct nonlocals, but analyze_and_optimize_format_calls can % take code for building a list of string.poly_types out of one % scope (e.g. the condition of an if-then-else) and replace it % with code to build the string directly in another scope % (such as the then part of that if-then-else, if that is where % the format call is). This can leave variables missing from % the nonlocal fields of the original scopes. And since % instmap_deltas are restricted to the goal's nonlocals, % they need to be recomputed as well. requantify_proc_general(ord_nl_maybe_lambda, !ProcInfo), recompute_instmap_delta_proc(no_recomp_atomics, !ProcInfo, !ModuleInfo), % Put the new proc_info back into !ModuleInfo, since some of the % following code could otherwise find obsolete information in there. pred_info_set_proc_info(ProcId, !.ProcInfo, PredInfo0, PredInfo1), % Remove the has_format_call marker from the pred_info before % putting it back, since any optimizable format calls will already % have been optimized. Since currently there is no program % transformation that inserts calls to these predicates, % there is no point in trying to optimize format_calls again later. pred_info_get_markers(PredInfo1, Markers1), remove_marker(marker_has_format_call, Markers1, Markers), pred_info_set_markers(Markers, PredInfo1, PredInfo), module_info_set_pred_info(PredId, PredInfo, !ModuleInfo) ; MaybeGoal = no % There should not be any updates to the var_table, % but even if there are, throw them away, since they apply to a version % of the goal that we will not be using. ). %-----------------------------------------------------------------------------% :- pred simplify_proc_maybe_warn_attribute_conflict(module_info::in, pred_id::in, proc_info::in, list(error_spec)::in, list(error_spec)::out) is det. simplify_proc_maybe_warn_attribute_conflict(ModuleInfo, PredId, ProcInfo, !Specs) :- module_info_pred_info(ModuleInfo, PredId, PredInfo), pred_info_get_markers(PredInfo, Markers), % The alternate goal by definition cannot be a call_foreign_proc. proc_info_get_goal(ProcInfo, Goal), Goal = hlds_goal(GoalExpr, GoalInfo), ( if GoalExpr = call_foreign_proc(Attributes, _, _, _, _, _, _) then Context = goal_info_get_context(GoalInfo), MaybeMayDuplicate = get_may_duplicate(Attributes), ( MaybeMayDuplicate = yes(MayDuplicate), maybe_warn_about_may_duplicate_attributes(MayDuplicate, Markers, Context, !Specs) ; MaybeMayDuplicate = no ), MaybeMayExportBody = get_may_export_body(Attributes), ( MaybeMayExportBody = yes(MayExportBody), maybe_warn_about_may_export_body_attribute(MayExportBody, Markers, Context, !Specs) ; MaybeMayExportBody = no ) else true ). :- pred maybe_warn_about_may_duplicate_attributes(proc_may_duplicate::in, pred_markers::in, prog_context::in, list(error_spec)::in, list(error_spec)::out) is det. maybe_warn_about_may_duplicate_attributes(MayDuplicate, Markers, Context, !Specs) :- ( MayDuplicate = proc_may_duplicate, ( if check_marker(Markers, marker_user_marked_no_inline) then Pieces = [words("Error: the"), quote("may_duplicate"), words("attribute on the foreign_proc contradicts the"), quote("no_inline"), words("pragma on the predicate.")], Spec = simplest_spec($pred, severity_error, phase_simplify(report_in_any_mode), Context, Pieces), !:Specs = [Spec | !.Specs] else true ) ; MayDuplicate = proc_may_not_duplicate, ( if check_marker(Markers, marker_user_marked_inline) then Pieces = [words("Error: the"), quote("may_not_duplicate"), words("attribute on the foreign_proc contradicts the"), quote("inline"), words("pragma on the predicate.")], Spec = simplest_spec($pred, severity_error, phase_simplify(report_in_any_mode), Context, Pieces), !:Specs = [Spec | !.Specs] else true ) ). :- pred maybe_warn_about_may_export_body_attribute(proc_may_export_body::in, pred_markers::in, prog_context::in, list(error_spec)::in, list(error_spec)::out) is det. maybe_warn_about_may_export_body_attribute(MayExportBody, Markers, Context, !Specs) :- ( MayExportBody = proc_may_export_body, ( if check_marker(Markers, marker_user_marked_no_inline) then Pieces = [words("Error: the"), quote("may_export_body"), words("attribute on the foreign_proc contradicts the"), quote("no_inline"), words("pragma on the predicate.")], Spec = simplest_spec($pred, severity_error, phase_simplify(report_in_any_mode), Context, Pieces), !:Specs = [Spec | !.Specs] else true ) ; MayExportBody = proc_may_not_export_body % Inlining is allowed within the same target file. ). %-----------------------------------------------------------------------------% :- pred simplify_top_level_goal(hlds_goal::in, hlds_goal::out, simplify_nested_context::in, instmap::in, simplify_info::in, simplify_info::out) is det. simplify_top_level_goal(!Goal, NestedContext0, InstMap0, !Info) :- % Simplification is done in two passes, which is we have two calls to % do_simplify_top_level_goal below. The first pass performs common % structure and duplicate call elimination. The second pass performs % excess assignment elimination, and cleans up the code after the % first pass. % % Two passes are required because some parts of the first pass can % obsolete existing nonlocals sets and instmap deltas, while some parts % of the second pass may need this information to be up-to-date. % Therefore we have to be prepared to recompute this information % between the two passes. some [!SimplifyTasks] ( simplify_info_get_simplify_tasks(!.Info, !:SimplifyTasks), OriginalSimplifyTasks = !.SimplifyTasks, ( if ( !.SimplifyTasks ^ do_opt_common_structs = opt_common_structs ; !.SimplifyTasks ^ do_opt_const_structs = opt_const_structs ; !.SimplifyTasks ^ do_opt_duplicate_calls = opt_dup_calls ) then !SimplifyTasks ^ do_mark_code_model_changes := do_not_mark_code_model_changes, !SimplifyTasks ^ do_excess_assign := do_not_elim_excess_assigns, simplify_info_set_simplify_tasks(!.SimplifyTasks, !Info), do_simplify_top_level_goal(!Goal, NestedContext0, InstMap0, !Info), !:SimplifyTasks = OriginalSimplifyTasks, % Disable the generation of error, warning and info messages % for the second pass. % - We can do this because any warnings we want to generate % will have been generated by the first pass. % - And we *must* do this, because the excess assign transformation % in pass 2 may replace a variable (say X) with a different % variable (say Y). So if in pass 1, we generated e.g. a message % involving X, then in pass 2 we would generate a version % of that same message, but referring to Y instead of X, % which is very likely to confuse the reader. simplify_info_set_allow_messages(do_not_allow_messages, !Info), % If requested, these tasks were done in pass 1. Repeating them % in pass 2 would serve no purpose, since we do nothing in pass 1 % that would generate new occurrences of the situations % that these tasks seek to optimize. !SimplifyTasks ^ do_opt_common_structs := do_not_opt_common_structs, !SimplifyTasks ^ do_opt_const_structs := do_not_opt_const_structs, !SimplifyTasks ^ do_opt_duplicate_calls := do_not_opt_dup_calls, simplify_info_reinit(!.SimplifyTasks, !Info) else true ), % On the second pass do excess assignment elimination and % some cleaning up after the common structure pass. do_simplify_top_level_goal(!Goal, NestedContext0, InstMap0, !Info), simplify_info_get_found_contains_trace(!.Info, FoundContainsTrace), ( FoundContainsTrace = no ; FoundContainsTrace = yes, set_goal_contains_trace_features_in_goal(!Goal, _) ) % We do not have to put OriginalSimplifyTasks back into !:Info % at the end, because neither of our two callers will look at % the tasks field of the !:Info value we return. We could return % just the fields they *do* look at, but there are many of them. ). :- pred do_simplify_top_level_goal(hlds_goal::in, hlds_goal::out, simplify_nested_context::in, instmap::in, simplify_info::in, simplify_info::out) is det. do_simplify_top_level_goal(!Goal, NestedContext0, InstMap0, !Info) :- !.Goal = hlds_goal(_, GoalInfo0), simplify_info_get_simplify_tasks(!.Info, SimplifyTasks), Common0 = common_info_init(SimplifyTasks), simplify_goal(!Goal, NestedContext0, InstMap0, Common0, _Common, !Info), maybe_recompute_fields_after_top_level_goal(GoalInfo0, InstMap0, !Goal, !Info). :- pred maybe_recompute_fields_after_top_level_goal(hlds_goal_info::in, instmap::in, hlds_goal::in, hlds_goal::out, simplify_info::in, simplify_info::out) is det. maybe_recompute_fields_after_top_level_goal(GoalInfo0, InstMap0, !Goal, !Info) :- simplify_info_get_rerun_quant_instmap_delta(!.Info, RerunQuantDelta), ( RerunQuantDelta = rerun_quant_instmap_deltas, NonLocals = goal_info_get_nonlocals(GoalInfo0), some [!VarTable, !RttiVarMaps, !ModuleInfo] ( simplify_info_get_var_table(!.Info, !:VarTable), simplify_info_get_rtti_varmaps(!.Info, !:RttiVarMaps), implicitly_quantify_goal_general(ord_nl_maybe_lambda, NonLocals, _, !Goal, !VarTable, !RttiVarMaps), simplify_info_set_var_table(!.VarTable, !Info), simplify_info_set_rtti_varmaps(!.RttiVarMaps, !Info), % Always recompute instmap_deltas for atomic goals - this is safer % in the case where unused variables should no longer be included % in the instmap_delta for a goal. simplify_info_get_module_info(!.Info, !:ModuleInfo), simplify_info_get_inst_varset(!.Info, InstVarSet), recompute_instmap_delta(recomp_atomics, !.VarTable, InstVarSet, InstMap0, !Goal, !ModuleInfo), simplify_info_set_module_info(!.ModuleInfo, !Info) ) ; RerunQuantDelta = do_not_rerun_quant_instmap_deltas ), simplify_info_get_rerun_det(!.Info, RerunDet), ( RerunDet = rerun_det, Detism = goal_info_get_determinism(GoalInfo0), some [!VarTable, !RttiVarMaps, !ModuleInfo, !ProcInfo] ( det_get_soln_context(Detism, SolnContext), % Det_infer_goal looks up the proc_info in the module_info for % the var_table, so we have to put them back in the module_info. simplify_info_get_module_info(!.Info, !:ModuleInfo), simplify_info_get_var_table(!.Info, !:VarTable), simplify_info_get_rtti_varmaps(!.Info, !:RttiVarMaps), simplify_info_get_pred_proc_id(!.Info, PredProcId), module_info_pred_proc_info(!.ModuleInfo, PredProcId, PredInfo, !:ProcInfo), proc_info_set_var_table(!.VarTable, !ProcInfo), proc_info_set_rtti_varmaps(!.RttiVarMaps, !ProcInfo), module_info_set_pred_proc_info(PredProcId, PredInfo, !.ProcInfo, !ModuleInfo), simplify_info_set_module_info(!.ModuleInfo, !Info), det_info_init(!.ModuleInfo, PredProcId, !.VarTable, pess_extra_vars_report, [], DetInfo0), det_infer_goal(!Goal, InstMap0, SolnContext, [], no, _, _, DetInfo0, DetInfo), det_info_get_module_info(DetInfo, !:ModuleInfo), det_info_get_var_table(DetInfo, !:VarTable), simplify_info_set_module_info(!.ModuleInfo, !Info), simplify_info_set_var_table(!.VarTable, !Info) ) ; RerunDet = do_not_rerun_det ). % The call to simplify_info_reinit in our caller will reset !:Info % to do_not_rerun_quant_instmap_deltas and do_not_rerun_det before % the next pass, if there is a next pass. %-----------------------------------------------------------------------------% :- pred set_goal_contains_trace_features_in_goal(hlds_goal::in, hlds_goal::out, contains_trace_goal::out) is det. set_goal_contains_trace_features_in_goal(Goal0, Goal, ContainsTrace) :- Goal0 = hlds_goal(GoalExpr0, GoalInfo0), ( ( GoalExpr0 = unify(_, _, _, _, _) ; GoalExpr0 = plain_call(_, _, _, _, _, _) ; GoalExpr0 = generic_call(_, _, _, _, _) ; GoalExpr0 = call_foreign_proc(_, _, _, _, _, _, _) ), GoalExpr = GoalExpr0, ContainsTrace = contains_no_trace_goal ; GoalExpr0 = conj(ConjType, SubGoals0), ContainsTrace0 = contains_no_trace_goal, set_goal_contains_trace_features_in_goals(SubGoals0, SubGoals, ContainsTrace0, ContainsTrace), GoalExpr = conj(ConjType, SubGoals) ; GoalExpr0 = disj(SubGoals0), ContainsTrace0 = contains_no_trace_goal, set_goal_contains_trace_features_in_goals(SubGoals0, SubGoals, ContainsTrace0, ContainsTrace), GoalExpr = disj(SubGoals) ; GoalExpr0 = switch(SwitchVar, CanFail, Cases0), ContainsTrace0 = contains_no_trace_goal, set_goal_contains_trace_features_in_cases(Cases0, Cases, ContainsTrace0, ContainsTrace), GoalExpr = switch(SwitchVar, CanFail, Cases) ; GoalExpr0 = if_then_else(Vars, Cond0, Then0, Else0), set_goal_contains_trace_features_in_goal(Cond0, Cond, CondContainsTrace), set_goal_contains_trace_features_in_goal(Then0, Then, ThenContainsTrace), set_goal_contains_trace_features_in_goal(Else0, Else, ElseContainsTrace), GoalExpr = if_then_else(Vars, Cond, Then, Else), ContainsTrace = worst_contains_trace(CondContainsTrace, worst_contains_trace(ThenContainsTrace, ElseContainsTrace)) ; GoalExpr0 = negation(SubGoal0), set_goal_contains_trace_features_in_goal(SubGoal0, SubGoal, ContainsTrace), GoalExpr = negation(SubGoal) ; GoalExpr0 = scope(Reason, SubGoal0), ( Reason = trace_goal(_, _, _, _, _), SubGoal = SubGoal0, ContainsTrace = contains_trace_goal ; Reason = from_ground_term(_, FGT), ( ( FGT = from_ground_term_construct ; FGT = from_ground_term_deconstruct ), SubGoal = SubGoal0, ContainsTrace = contains_no_trace_goal ; ( FGT = from_ground_term_initial ; FGT = from_ground_term_other ), set_goal_contains_trace_features_in_goal(SubGoal0, SubGoal, ContainsTrace) ) ; ( Reason = disable_warnings(_, _) ; Reason = exist_quant(_) ; Reason = promise_solutions(_, _) ; Reason = promise_purity(_) ; Reason = require_detism(_) ; Reason = require_complete_switch(_) ; Reason = require_switch_arms_detism(_, _) ; Reason = commit(_) ; Reason = barrier(_) ; Reason = loop_control(_, _, _) ), set_goal_contains_trace_features_in_goal(SubGoal0, SubGoal, ContainsTrace) ), GoalExpr = scope(Reason, SubGoal) ; GoalExpr0 = shorthand(ShortHand0), ( ShortHand0 = atomic_goal(GoalType, Outer, Inner, MaybeOutputVars, MainGoal0, OrElseGoals0, OrElseInners), set_goal_contains_trace_features_in_goal(MainGoal0, MainGoal, MainContainsTrace), OrElseContainsTrace0 = contains_no_trace_goal, set_goal_contains_trace_features_in_goals( OrElseGoals0, OrElseGoals, OrElseContainsTrace0, OrElseContainsTrace), ShortHand = atomic_goal(GoalType, Outer, Inner, MaybeOutputVars, MainGoal, OrElseGoals, OrElseInners), GoalExpr = shorthand(ShortHand), ContainsTrace = worst_contains_trace(MainContainsTrace, OrElseContainsTrace) ; ShortHand0 = try_goal(MaybeIO, ResultVar, SubGoal0), set_goal_contains_trace_features_in_goal(SubGoal0, SubGoal, ContainsTrace), ShortHand = try_goal(MaybeIO, ResultVar, SubGoal), GoalExpr = shorthand(ShortHand) ; ShortHand0 = bi_implication(_, _), unexpected($pred, "bi_implication") ) ), ( ContainsTrace = contains_trace_goal, goal_info_add_feature(feature_contains_trace, GoalInfo0, GoalInfo) ; ContainsTrace = contains_no_trace_goal, goal_info_remove_feature(feature_contains_trace, GoalInfo0, GoalInfo) ), Goal = hlds_goal(GoalExpr, GoalInfo). :- pred set_goal_contains_trace_features_in_goals( list(hlds_goal)::in, list(hlds_goal)::out, contains_trace_goal::in, contains_trace_goal::out) is det. set_goal_contains_trace_features_in_goals([], [], !ContainsTrace). set_goal_contains_trace_features_in_goals([Goal0 | Goals0], [Goal | Goals], !ContainsTrace) :- set_goal_contains_trace_features_in_goal(Goal0, Goal, GoalContainsTrace), !:ContainsTrace = worst_contains_trace(GoalContainsTrace, !.ContainsTrace), set_goal_contains_trace_features_in_goals(Goals0, Goals, !ContainsTrace). :- pred set_goal_contains_trace_features_in_cases( list(case)::in, list(case)::out, contains_trace_goal::in, contains_trace_goal::out) is det. set_goal_contains_trace_features_in_cases([], [], !ContainsTrace). set_goal_contains_trace_features_in_cases([Case0 | Cases0], [Case | Cases], !ContainsTrace) :- Case0 = case(MainConsId, OtherConsIds, Goal0), set_goal_contains_trace_features_in_goal(Goal0, Goal, GoalContainsTrace), Case = case(MainConsId, OtherConsIds, Goal), !:ContainsTrace = worst_contains_trace(GoalContainsTrace, !.ContainsTrace), set_goal_contains_trace_features_in_cases(Cases0, Cases, !ContainsTrace). %-----------------------------------------------------------------------------% :- end_module check_hlds.simplify.simplify_proc. %-----------------------------------------------------------------------------%