[m-rev.] diff: fix mantis bug 113
zs at csse.unimelb.edu.au
Fri Oct 16 17:51:59 AEDT 2009
Fix Mantis bug 113. Unfortunately, even without bug 113, the program
has an error, so there is no simple way to add it as a test case.
Getting rid of the error would take away the raison d'etre of the test.
Call the part of post_typecheck that fixes up the interface of
predicates directly from here, not from purity.m. purity.m was
calling this part first thing anyway, so there was no point in
doing this from purity.m in the first place. Doing it from
the top level allows us to stop doing purity checking (and thus
post_typecheck) on the definitions of predicates if the program
had a type error. Bug 113 was caused by an operation of post_typecheck
on a goal that (previously incorrectly, now correctly) assumes
the absence of type errors.
Move the main (-v) progress messages here from purity.m as well,
since here is where they are printed for other compiler passes.
Conform to the changes above, and fix some bitrot in old documentation.
Delete an unused predicate, and fix some bad programming style.
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RCS file: /home/mercury/mercury1/repository/mercury/compiler/mercury_compile_front_end.m,v
retrieving revision 1.1
diff -u -b -r1.1 mercury_compile_front_end.m
--- compiler/mercury_compile_front_end.m 14 Oct 2009 05:28:38 -0000 1.1
+++ compiler/mercury_compile_front_end.m 16 Oct 2009 06:29:09 -0000
@@ -75,6 +75,7 @@
:- import_module check_hlds.mode_constraints.
:- import_module check_hlds.modes.
:- import_module check_hlds.polymorphism.
+:- import_module check_hlds.post_typecheck.
:- import_module check_hlds.purity.
:- import_module check_hlds.simplify.
:- import_module check_hlds.stratify.
@@ -97,6 +98,7 @@
:- import_module benchmarking.
:- import_module bool.
+:- import_module int.
:- import_module maybe.
:- import_module pair.
:- import_module set.
@@ -245,21 +247,29 @@
!:FoundError = yes,
- puritycheck(Verbose, Stats, !HLDS, FoundTypeError,
- FoundPostTypecheckError, !Specs, !IO),
- maybe_dump_hlds(!.HLDS, 20, "puritycheck", !DumpInfo, !IO),
- !:FoundError = !.FoundError `or` FoundTypeError,
+ % Only report error messages for unbound type variables if we didn't
+ % get any type errors already; this avoids a lot of spurious
+ % diagnostics.
+ PostTypeCheckReportErrors = bool.not(FoundTypeError),
+ module_info_predids(PredIds, !HLDS),
+ post_typecheck_finish_preds(PredIds, PostTypeCheckReportErrors,
+ NumPostTypeCheckErrors, !HLDS, !Specs),
+ maybe_dump_hlds(!.HLDS, 19, "post_typecheck", !DumpInfo, !IO),
% Stop here if `--typecheck-only' was specified.
globals.lookup_bool_option(Globals, typecheck_only, TypecheckOnly),
- TypecheckOnly = yes
+ TypecheckOnly = yes,
+ ( NumPostTypeCheckErrors > 0 ->
+ !:FoundError = yes
TypecheckOnly = no,
( FoundTypeError = yes
- ; FoundPostTypecheckError = yes
+ ; NumPostTypeCheckErrors > 0
% XXX It would be nice if we could go on and mode-check the
@@ -269,6 +279,9 @@
% are not type-correct.
!:FoundError = yes
+ puritycheck(Verbose, Stats, !HLDS, !Specs, !IO),
+ maybe_dump_hlds(!.HLDS, 20, "puritycheck", !DumpInfo, !IO),
% Substitute implementation-defined literals before clauses are
% written out to `.opt' files.
subst_implementation_defined_literals(Verbose, Stats, !HLDS,
@@ -480,17 +493,16 @@
:- pred puritycheck(bool::in, bool::in, module_info::in, module_info::out,
- bool::in, bool::out,
list(error_spec)::in, list(error_spec)::out, io::di, io::uo) is det.
-puritycheck(Verbose, Stats, !HLDS, FoundTypeError, FoundPostTypecheckError,
- !Specs, !IO) :-
- puritycheck_module(FoundTypeError, FoundPostTypecheckError, !HLDS,
- , PuritySpecs),
+puritycheck(Verbose, Stats, !HLDS, !Specs, !IO) :-
+ maybe_write_string(Verbose, "% Purity-checking clauses...\n", !IO),
+ puritycheck_module(!HLDS, , PuritySpecs),
!:Specs = PuritySpecs ++ !.Specs,
PurityErrors = contains_errors(Globals, PuritySpecs),
maybe_write_out_errors(Verbose, Globals, !HLDS, !Specs, !IO),
+ maybe_report_stats(Stats, !IO),
PurityErrors = yes,
RCS file: /home/mercury/mercury1/repository/mercury/compiler/post_typecheck.m,v
retrieving revision 1.137
diff -u -b -r1.137 post_typecheck.m
--- compiler/post_typecheck.m 8 Sep 2009 02:43:36 -0000 1.137
+++ compiler/post_typecheck.m 16 Oct 2009 06:29:09 -0000
@@ -78,14 +78,6 @@
:- pred post_typecheck_finish_imported_pred_no_io(module_info::in,
list(proc_id)::out, pred_info::in, pred_info::out) is det.
- % For ill-typed preds, we just need to set the modes up correctly
- % so that any calls to that pred from correctly-typed predicates
- % won't result in spurious mode errors.
-:- pred post_typecheck_finish_ill_typed_pred(module_info::in, pred_id::in,
- pred_info::in, pred_info::out,
- list(error_spec)::in, list(error_spec)::out) is det.
% Now that the assertion has finished being typechecked, remove it
% from further processing and store it in the assertion_table.
@@ -566,12 +558,6 @@
post_typecheck_finish_pred_no_io(ModuleInfo, ErrorProcs, !PredInfo) :-
propagate_types_into_modes(ModuleInfo, ErrorProcs, !PredInfo).
-post_typecheck_finish_ill_typed_pred(ModuleInfo, PredId, !PredInfo, !Specs) :-
- propagate_types_into_modes(ModuleInfo, ErrorProcs, !PredInfo),
- report_unbound_inst_vars(ModuleInfo, PredId, ErrorProcs, !PredInfo,
- check_for_indistinguishable_modes(ModuleInfo, PredId, !PredInfo, !Specs).
% For imported preds, we just need to ensure that all constructors
% occurring in predicate mode declarations are module qualified.
@@ -875,7 +861,8 @@
ProcIds = pred_info_procids(!.PredInfo),
propagate_types_into_proc_modes(ModuleInfo, ProcIds, ArgTypes,
- , ErrorProcIds, Procs0, Procs),
+ , RevErrorProcIds, Procs0, Procs),
+ ErrorProcIds = list.reverse(RevErrorProcIds),
@@ -884,10 +871,9 @@
list(mer_type)::in, list(proc_id)::in, list(proc_id)::out,
proc_table::in, proc_table::out) is det.
-propagate_types_into_proc_modes(_, , _,
- ErrorProcIds, list.reverse(ErrorProcIds), !Procs).
+propagate_types_into_proc_modes(_, , _, !RevErrorProcIds, !Procs).
propagate_types_into_proc_modes(ModuleInfo, [ProcId | ProcIds], ArgTypes,
- !ErrorProcIds, !Procs) :-
+ !RevErrorProcIds, !Procs) :-
map.lookup(!.Procs, ProcId, ProcInfo0),
propagate_types_into_mode_list(ModuleInfo, ArgTypes, ArgModes0, ArgModes),
@@ -897,13 +883,13 @@
% to be module-qualified; and it needs to be done before mode analysis,
% to avoid internal errors.)
( mode_list_contains_inst_var(ArgModes, ModuleInfo, _InstVar) ->
- !:ErrorProcIds = [ProcId | !.ErrorProcIds]
+ !:RevErrorProcIds = [ProcId | !.RevErrorProcIds]
proc_info_set_argmodes(ArgModes, ProcInfo0, ProcInfo),
svmap.det_update(ProcId, ProcInfo, !Procs)
propagate_types_into_proc_modes(ModuleInfo, ProcIds, ArgTypes,
- !ErrorProcIds, !Procs).
+ !RevErrorProcIds, !Procs).
:- pred report_unbound_inst_vars(module_info::in, pred_id::in,
list(proc_id)::in, pred_info::in, pred_info::out,
RCS file: /home/mercury/mercury1/repository/mercury/compiler/purity.m,v
retrieving revision 1.134
diff -u -b -r1.134 purity.m
--- compiler/purity.m 8 Sep 2009 02:43:37 -0000 1.134
+++ compiler/purity.m 16 Oct 2009 06:29:09 -0000
@@ -51,8 +51,8 @@
% To keep purity/impurity consistent, it is required that every impure
% predicate/function be declared so. A predicate is impure if:
-% 1. It's declared impure, or
-% 2a. It's not promised pure, and
+% 1. It is declared impure, or
+% 2a. It is not promised pure, and
% 2b. It calls some impure predicates or functions.
% A predicate or function is declared impure by preceding the `pred' or
@@ -63,7 +63,7 @@
% Calls to impure predicates may not be optimized away. Neither may they be
-% reodered relative to any other goals in a given conjunction; ie, an impure
+% reordered relative to any other goals in a given conjunction; i.e., an impure
% goal cleaves a conjunction into the stuff before it and the stuff after it.
% Both of these groups may be reordered separately, but no goal from either
% group may move into the other. Similarly for disjunctions.
@@ -93,14 +93,13 @@
% This eliminates any need to define some order of evaluation of nested
% impure functions.
-% Of course it also eliminates the benefits of using functions to
-% cut down on the number of variables introduced. The main use of
-% impure functions is to interface nicely with foreign language
-% Any non-variable arguments to the function are flattened into
-% unification goals (see unravel_unifications in superhomogeneous.m)
-% which are placed as pure goals before the function call itself.
+% Of course it also eliminates the benefits of using functions to cut down
+% on the number of variables introduced. The main use of impure functions
+% is to interface nicely with foreign language functions.
+% Any non-variable arguments to the function are flattened into unification
+% goals (see unravel_unifications in superhomogeneous.m) which are placed
+% as pure goals before the function call itself.
% It would be nice to use impure functions in DCG goals as well as
@@ -108,14 +107,13 @@
% It might be nice to allow
% X = impure some_impure_fuc(Arg1, Arg2, ...)
-% syntax as well. But there are advantages to having the
-% impure/semipure annotation in a regular position (on the left
-% hand side of a goal) too. If this is implemented it should
-% probably be handled in prog_io, and turned into an impure
-% unify item.
+% syntax aswell. But there are advantages to having the impure or semipure
+% annotation in a regular position (on the left hand side of a goal) too.
+% If this is implemented it should probably be handled in prog_io, and
+% turned into an impure unify item.
-% It may also be nice to allow semipure function calls to occur
-% inline (since ordering is not an issue for them).
+% It may also be nice to allow semipure function calls to occur inline
+% (since ordering is not an issue for them).
% To do:
% Reconsider whether impure parallel conjuncts should be allowed.
@@ -132,7 +130,6 @@
:- import_module parse_tree.error_util.
:- import_module parse_tree.prog_data.
-:- import_module bool.
:- import_module list.
@@ -146,8 +143,7 @@
% would cause problems for later passes (if so, we stop compilation after
% this pass).
-:- pred puritycheck_module(bool::in, bool::out,
- module_info::in, module_info::out,
+:- pred puritycheck_module(module_info::in, module_info::out,
list(error_spec)::in, list(error_spec)::out) is det.
% Rerun purity checking on a procedure after an optimization pass has
@@ -207,47 +203,9 @@
:- import_module assoc_list.
-% Public Predicates
-puritycheck_module(FoundTypeError, PostTypecheckError, !ModuleInfo, !Specs) :-
- module_info_get_globals(!.ModuleInfo, Globals),
- globals.lookup_bool_option(Globals, statistics, Statistics),
- globals.lookup_bool_option(Globals, verbose, Verbose),
- trace [io(!IO)] (
- maybe_write_string(Verbose, "% Purity-checking clauses...\n", !IO)
- finish_typecheck_and_check_preds_purity(FoundTypeError, PostTypecheckError,
- !ModuleInfo, !Specs),
- trace [io(!IO)] (
- maybe_report_stats(Statistics, !IO)
- % Purity-check the code for all the predicates in a module.
-:- pred finish_typecheck_and_check_preds_purity(bool::in, bool::out,
- module_info::in, module_info::out,
- list(error_spec)::in, list(error_spec)::out) is det.
- !ModuleInfo, !Specs) :-
+puritycheck_module(!ModuleInfo, !Specs) :-
- % Only report error messages for unbound type variables if we didn't get
- % any type errors already; this avoids a lot of spurious diagnostics.
- ReportTypeErrors = bool.not(FoundTypeError),
- post_typecheck_finish_preds(PredIds, ReportTypeErrors, NumPostErrors,
- !ModuleInfo, !Specs),
- ( NumPostErrors > 0 ->
- PostTypecheckError = yes
- PostTypecheckError = no
check_preds_purity(PredIds, !ModuleInfo, !Specs).
:- pred check_preds_purity(list(pred_id)::in,
@@ -988,9 +946,8 @@
% Peform purity checking of the actual and declared purity,
% and check that promises are consistent.
- % ActualPurity: The inferred purity of the pred
- % DeclaredPurity: The declared purity of the pred
- % InPragmaCCode: Is this foreign language code?
+ % ActualPurity: The inferred purity of the pred.
+ % DeclaredPurity: The declared purity of the pred.
% Promised: Did we promise this pred as pure?
:- pred perform_pred_purity_checks(pred_info::in, purity::in, purity::in,
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