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mercury/compiler/mode_errors.m
Peter Ross 84ffc0924d Fix --warn-unused-imports warnings in some of the modules. 
Estimated hours taken: 4
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library/*.m:
compiler/*.m:
	Fix --warn-unused-imports warnings in some of the modules.
2006-09-27 06:17:09 +00:00

1422 lines
59 KiB
Mathematica
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%-----------------------------------------------------------------------------%
% vim: ft=mercury ts=4 sw=4 et
%-----------------------------------------------------------------------------%
% Copyright (C) 1994-2006 The University of Melbourne.
% This file may only be copied under the terms of the GNU General
% Public License - see the file COPYING in the Mercury distribution.
%-----------------------------------------------------------------------------%
%
% File: mode_errors.m.
% Main author: fjh.
%
% This module contains all the error-reporting routines for the mode-checker.
%
%-----------------------------------------------------------------------------%
:- module check_hlds.mode_errors.
:- interface.
:- import_module hlds.
:- import_module hlds.hlds_pred.
:- import_module hlds.hlds_module.
:- import_module hlds.hlds_goal.
:- import_module mdbcomp.
:- import_module mdbcomp.prim_data.
:- import_module parse_tree.
:- import_module parse_tree.error_util.
:- import_module parse_tree.prog_data.
:- import_module check_hlds.mode_info.
:- import_module bool.
:- import_module io.
:- import_module list.
:- import_module pair.
:- import_module set.
%-----------------------------------------------------------------------------%
:- type merge_context
---> disj
; if_then_else.
:- type merge_error == pair(prog_var, list(mer_inst)).
:- type merge_errors == list(merge_error).
:- type delayed_goal
---> delayed_goal(
set(prog_var), % The vars it's waiting on.
mode_error_info, % The reason it can't be scheduled.
hlds_goal % The goal itself.
).
:- type mode_error
---> mode_error_disj(merge_context, merge_errors)
% Different arms of a disjunction result in different insts
% for some non-local variables.
; mode_error_par_conj(merge_errors)
% Different arms of a parallel conj result in mutually exclusive
% bindings - i.e. the process of unifying the instmaps from the end
% of each branch failed.
; mode_error_higher_order_pred_var(pred_or_func, prog_var, mer_inst,
arity)
% The predicate variable in a higher-order predicate or function
% call didn't have a higher-order predicate or function inst
% of the appropriate arity.
; mode_error_poly_unify(prog_var, mer_inst)
% A variable in a polymorphic unification with unknown
% type has inst other than `ground' or `any'.
; mode_error_var_is_live(prog_var)
% Call to a predicate which will clobber its argument,
% but the argument is still live.
; mode_error_var_has_inst(prog_var, mer_inst, mer_inst)
% Call to a predicate with an insufficiently
% instantiated variable (for preds with one mode).
; mode_error_unify_pred(prog_var, mode_error_unify_rhs, mer_type,
pred_or_func)
% An attempt was made to unify two higher-order
% predicate or function variables.
; mode_error_implied_mode(prog_var, mer_inst, mer_inst)
% A call to a predicate with an overly instantiated variable
% would use an implied mode of the predicate, but we can't
% introduce a simple unification after calling the predicate in a
% principal mode because the relevant variable has complex inst
% (such as any).
; mode_error_no_mode_decl
% A call to a predicate for which there are no mode declarations
% (and mode inference is not enabled).
; mode_error_no_matching_mode(list(prog_var), list(mer_inst))
% Call to a predicate with an insufficiently instantiated variable
% (for preds with >1 mode).
; mode_error_in_callee(list(prog_var), list(mer_inst),
pred_id, proc_id, list(mode_error_info))
% Call to a predicate with initial argument insts for which mode
% inference gave a mode error in the callee.
; mode_error_bind_var(var_lock_reason, prog_var, mer_inst, mer_inst)
% Attempt to bind a non-local variable inside a negated context,
% or attempt to re-bind a variable in a parallel conjunct.
; mode_error_non_local_lambda_var(prog_var, mer_inst)
% Attempt to pass a live non-ground var as a non-local variable
% to a lambda goal.
; mode_error_unify_var_var(prog_var, prog_var, mer_inst, mer_inst)
% Attempt to unify two free variables.
; mode_error_unify_var_functor(prog_var, cons_id, list(prog_var),
mer_inst, list(mer_inst))
% Attempt to unify a free var with a functor containing
% free arguments.
; mode_error_unify_var_lambda(prog_var, mer_inst, mer_inst)
% Some sort of error in attempt to unify a variable with lambda
% expression.
; mode_error_conj(list(delayed_goal), schedule_culprit)
% A conjunction contains one or more unscheduleable goals;
% schedule_culprit gives the reason why they couldn't be scheduled.
; mode_error_final_inst(int, prog_var, mer_inst, mer_inst,
final_inst_error)
% One of the head variables did not have the expected final inst
% on exit from the proc.
; purity_error_should_be_in_promise_purity_scope(
negated_context_desc, prog_var)
% The condition of an if-then-else or the body of a negation
% contained an inst any non-local, but was not inside a
% promise_purity scope.
; purity_error_lambda_should_be_impure(list(prog_var)).
% A lambda term containing inst any non-locals should have been
% declared impure, but hasn't been (executing such a lambda may
% further constrain the inst any variables, thereby violating
% referential transparency).
:- type negated_context_desc
---> if_then_else
; negation.
:- type schedule_culprit
---> goal_itself_was_impure
; goals_followed_by_impure_goal(hlds_goal)
; conj_floundered. % We've reached the end of a conjunction
% and there were still delayed goals.
:- type final_inst_error
---> too_instantiated
; not_instantiated_enough
; wrongly_instantiated. % A catchall for anything that doesn't
% fit into the above two categories.
:- type mode_error_unify_rhs
---> error_at_var(prog_var)
; error_at_functor(cons_id, list(prog_var))
; error_at_lambda(list(prog_var), list(mer_mode)).
:- type mode_error_info
---> mode_error_info(
set(prog_var), % The variables which caused the error
% (we will attempt to reschedule the goal
% if one of these variables becomes
% more instantiated).
mode_error, % The nature of the error.
prog_context, % Where the error occurred.
mode_context % Where the error occurred.
).
:- type mode_warning
---> cannot_succeed_var_var(prog_var, prog_var, mer_inst, mer_inst)
; cannot_succeed_var_functor(prog_var, mer_inst, cons_id).
:- type mode_warning_info
---> mode_warning_info(
mode_warning, % The nature of the error.
prog_context, % Where the error occurred.
mode_context % Where the error occurred.
).
%-----------------------------------------------------------------------------%
% If there were any errors recorded in the mode_info,
% report them to the user now.
%
:- pred report_mode_errors(mode_info::in, mode_info::out,
io::di, io::uo) is det.
% If there were any warnings recorded in the mode_info,
% report them to the user now.
%
:- pred report_mode_warnings(mode_info::in, mode_info::out,
io::di, io::uo) is det.
% Initialize the mode_context.
%
:- pred mode_context_init(mode_context::out) is det.
% Report an error for a predicate with no mode declarations
% unless mode inference is enabled and the predicate is local.
% XXX This predicate should be included in the types above.
%
:- pred maybe_report_error_no_modes(pred_id::in, pred_info::in,
module_info::in, module_info::out, io::di, io::uo) is det.
% Report an error for the case when two mode declarations
% declare indistinguishable modes.
% XXX This predicate should be included in the types above.
%
:- func report_indistinguishable_modes_error(module_info, proc_id, proc_id,
pred_id, pred_info) = error_spec.
% Write out the inferred `mode' declarations for a list of pred_ids.
% The bool indicates whether or not to write out determinism
% annotations on the modes (it should only be set to `yes' _after_
% determinism analysis).
%
:- pred write_mode_inference_messages(list(pred_id)::in, bool::in,
module_info::in, io::di, io::uo) is det.
:- func mode_decl_to_string(proc_id, pred_info) = string.
%-----------------------------------------------------------------------------%
%-----------------------------------------------------------------------------%
:- implementation.
:- import_module check_hlds.mode_info.
:- import_module check_hlds.mode_util.
:- import_module hlds.hlds_error_util.
:- import_module hlds.hlds_out.
:- import_module libs.
:- import_module libs.compiler_util.
:- import_module libs.globals.
:- import_module libs.options.
:- import_module parse_tree.mercury_to_mercury.
:- import_module parse_tree.prog_mode.
:- import_module parse_tree.prog_out.
:- import_module parse_tree.prog_util.
:- import_module assoc_list.
:- import_module int.
:- import_module map.
:- import_module maybe.
:- import_module string.
:- import_module term.
:- import_module varset.
%-----------------------------------------------------------------------------%
%-----------------------------------------------------------------------------%
report_mode_errors(!ModeInfo, !IO) :-
mode_info_get_errors(!.ModeInfo, Errors),
(
Errors = [FirstError | _],
% XXX Document exactly why we only report the first.
FirstError = mode_error_info(_, ModeError, Context, ModeContext),
mode_info_set_context(Context, !ModeInfo),
mode_info_set_mode_context(ModeContext, !ModeInfo),
report_mode_error(ModeError, !ModeInfo, !IO)
;
Errors = []
).
report_mode_warnings(!ModeInfo, !IO) :-
mode_info_get_warnings(!.ModeInfo, Warnings),
list.foldl2(report_mode_warning, Warnings, !ModeInfo, !IO).
% Print an error message describing a mode error.
%
:- pred report_mode_error(mode_error::in,
mode_info::in, mode_info::out, io::di, io::uo) is det.
report_mode_error(ModeError, !ModeInfo, !IO) :-
Spec = mode_error_to_spec(ModeError, !.ModeInfo),
write_error_spec(Spec, 0, _NumWarnings, 0, NumErrors, !IO),
mode_info_get_module_info(!.ModeInfo, ModuleInfo0),
module_info_incr_num_errors(NumErrors, ModuleInfo0, ModuleInfo),
mode_info_set_module_info(ModuleInfo, !ModeInfo).
% Print a warning message.
%
:- pred report_mode_warning(mode_warning_info::in,
mode_info::in, mode_info::out, io::di, io::uo) is det.
report_mode_warning(Warning, !ModeInfo, !IO) :-
Spec = mode_warning_to_spec(!.ModeInfo, Warning),
write_error_spec(Spec, 0, _NumWarnings, 0, NumErrors, !IO),
mode_info_get_module_info(!.ModeInfo, ModuleInfo0),
module_info_incr_num_errors(NumErrors, ModuleInfo0, ModuleInfo),
mode_info_set_module_info(ModuleInfo, !ModeInfo).
%-----------------------------------------------------------------------------%
:- func mode_error_to_spec(mode_error, mode_info) = error_spec.
mode_error_to_spec(ModeError, ModeInfo) = Spec :-
(
ModeError = mode_error_disj(MergeContext, ErrorList),
Spec = mode_error_disj_to_spec(ModeInfo, MergeContext, ErrorList)
;
ModeError = mode_error_par_conj(ErrorList),
Spec = mode_error_par_conj_to_spec(ModeInfo, ErrorList)
;
ModeError = mode_error_higher_order_pred_var(PredOrFunc, Var, Inst,
Arity),
Spec = mode_error_higher_order_pred_var_to_spec(ModeInfo, PredOrFunc,
Var, Inst, Arity)
;
ModeError = mode_error_poly_unify(Var, Inst),
Spec = mode_error_poly_unify_to_spec(ModeInfo, Var, Inst)
;
ModeError = mode_error_var_is_live(Var),
Spec = mode_error_var_is_live_to_spec(ModeInfo, Var)
;
ModeError = mode_error_var_has_inst(Var, InstA, InstB),
Spec = mode_error_var_has_inst_to_spec(ModeInfo, Var, InstA, InstB)
;
ModeError = mode_error_unify_pred(Var, RHS, Type, PredOrFunc),
Spec = mode_error_unify_pred_to_spec(ModeInfo, Var, RHS, Type,
PredOrFunc)
;
ModeError = mode_error_implied_mode(Var, InstA, InstB),
Spec = mode_error_implied_mode_to_spec(ModeInfo, Var, InstA, InstB)
;
ModeError = mode_error_no_mode_decl,
Spec = mode_error_no_mode_decl_to_spec(ModeInfo)
;
ModeError = mode_error_bind_var(Reason, Var, InstA, InstB),
Spec = mode_error_bind_var_to_spec(ModeInfo, Reason, Var,
InstA, InstB)
;
ModeError = mode_error_non_local_lambda_var(Var, Inst),
Spec = mode_error_non_local_lambda_var_to_spec(ModeInfo, Var, Inst)
;
ModeError = mode_error_unify_var_var(VarA, VarB, InstA, InstB),
Spec = mode_error_unify_var_var_to_spec(ModeInfo, VarA, VarB,
InstA, InstB)
;
ModeError = mode_error_unify_var_lambda(VarA, InstA, InstB),
Spec = mode_error_unify_var_lambda_to_spec(ModeInfo, VarA,
InstA, InstB)
;
ModeError = mode_error_unify_var_functor(Var, Name, Args, Inst,
ArgInsts),
Spec = mode_error_unify_var_functor_to_spec(ModeInfo, Var, Name,
Args, Inst, ArgInsts)
;
ModeError = mode_error_conj(Errors, Culprit),
Spec = mode_error_conj_to_spec(ModeInfo, Errors, Culprit)
;
ModeError = mode_error_no_matching_mode(Vars, Insts),
Spec = mode_error_no_matching_mode_to_spec(ModeInfo, Vars, Insts)
;
ModeError = mode_error_in_callee(Vars, Insts,
CalleePredId, CalleeProcId, CalleeErrors),
Spec = mode_error_in_callee_to_spec(ModeInfo, Vars, Insts,
CalleePredId, CalleeProcId, CalleeErrors)
;
ModeError = mode_error_final_inst(ArgNum, Var, VarInst, Inst, Reason),
Spec = mode_error_final_inst_to_spec(ModeInfo, ArgNum, Var, VarInst,
Inst, Reason)
;
ModeError = purity_error_should_be_in_promise_purity_scope(NegCtxt,
Var),
Spec = purity_error_should_be_in_promise_purity_scope_to_spec(NegCtxt,
ModeInfo, Var)
;
ModeError = purity_error_lambda_should_be_impure(Vars),
Spec = purity_error_lambda_should_be_impure_to_spec(ModeInfo, Vars)
).
:- func mode_warning_to_spec(mode_info, mode_warning_info) = error_spec.
mode_warning_to_spec(!.ModeInfo, Warning) = Spec :-
Warning = mode_warning_info(ModeWarning, Context, ModeContext),
mode_info_set_context(Context, !ModeInfo),
mode_info_set_mode_context(ModeContext, !ModeInfo),
(
ModeWarning = cannot_succeed_var_var(VarA, VarB, InstA, InstB),
Spec = mode_warning_cannot_succeed_var_var(!.ModeInfo, VarA, VarB,
InstA, InstB)
;
ModeWarning = cannot_succeed_var_functor(Var, Inst, ConsId),
Spec = mode_warning_cannot_succeed_var_functor(!.ModeInfo,
Var, Inst, ConsId)
).
%-----------------------------------------------------------------------------%
:- func mode_error_conj_to_spec(mode_info, list(delayed_goal),
schedule_culprit) = error_spec.
mode_error_conj_to_spec(ModeInfo, Errors, Culprit) = Spec :-
mode_info_get_context(ModeInfo, Context),
mode_info_get_varset(ModeInfo, VarSet),
(
Errors = [],
unexpected(this_file, "mode_error_conj_to_spec: no errors")
;
Errors = [Error],
Msgs1 = mode_error_conjunct_to_msgs(VarSet, Context, ModeInfo, Error)
;
Errors = [_, _ | _],
% If there's more than one error, we use the setting of
% --verbose-errors to decide between reporting just one and
% reporting them all. Unfortunately, We can't use the
% verbose_and_nonverbose functor of the error_msg_component type
% to package up the two cases, because we need to package up
% multiple messages, each with its own context.
list.filter(is_error_important, Errors, ImportantErrors, OtherErrors),
mode_info_get_module_info(ModeInfo, ModuleInfo),
module_info_get_globals(ModuleInfo, Globals),
globals.lookup_bool_option(Globals, verbose_errors, VerboseErrors),
(
VerboseErrors = no,
% In the absence of --verbose-errors, report only one error.
% We prefer that this be an important error.
( ImportantErrors = [FirstImportantError | _] ->
ConjMsgs = mode_error_conjunct_to_msgs(VarSet, Context,
ModeInfo, FirstImportantError)
; OtherErrors = [FirstOtherError | _] ->
ConjMsgs = mode_error_conjunct_to_msgs(VarSet, Context,
ModeInfo, FirstOtherError)
;
unexpected(this_file,
"mode_error_conj_to_spec: no errors of any kind")
),
% MoreMsg is there to indicate that --verbose-errors would yield
% more information.
MoreMsg = simple_msg(Context, [verbose_only([])]),
Msgs1 = ConjMsgs ++ [MoreMsg]
;
VerboseErrors = yes,
Preamble = mode_info_context_preamble(ModeInfo),
ConjPieces = [words("mode error in conjunction. The next"),
fixed(int_to_string(list.length(Errors))),
words("error messages indicate"),
words("possible causes of this error.")],
Msgs1Start = [simple_msg(Context,
[always(Preamble ++ ConjPieces)])],
Msgs1Rest = list.map(
mode_error_conjunct_to_msgs(VarSet, Context, ModeInfo),
ImportantErrors ++ OtherErrors),
Msgs1 = Msgs1Start ++ list.condense(Msgs1Rest)
)
),
% If the goal(s) couldn't be scheduled because we couldn't reorder things
% past an impure goal, then report that.
(
Culprit = conj_floundered,
% We've already reported everything we can.
Msgs2 = []
;
Culprit = goal_itself_was_impure,
Pieces = [words("The goal could not be reordered,"),
words("because it was impure.")],
Msgs2 = [simple_msg(Context, [always(Pieces)])]
;
Culprit = goals_followed_by_impure_goal(ImpureGoal),
ImpureGoal = _ - ImpureGoalInfo,
goal_info_get_context(ImpureGoalInfo, ImpureGoalContext),
Pieces1 = [words("The goal could not be reordered,"),
words("because it was followed by an impure goal.")],
Pieces2 = [words("This is the location of the impure goal.")],
Msgs2 = [
simple_msg(Context, [always(Pieces1)]),
simple_msg(ImpureGoalContext, [always(Pieces2)])
]
),
Spec = error_spec(severity_error, phase_mode_check, Msgs1 ++ Msgs2).
:- pred is_error_important(delayed_goal::in) is semidet.
is_error_important(Error) :-
Error = delayed_goal(_, mode_error_info(_, ModeError, _, ModeContext), _),
(
% An error is important unless it is a non-explicit unification,
% i.e. a head unification or a call argument unification.
ModeContext = mode_context_unify(unify_context(UnifyContext, _), _),
UnifyContext \= umc_explicit,
% Except that errors in lambda goals are important even if the
% unification that creates the lambda goal is an implicit one.
ModeError \= mode_error_non_local_lambda_var(_, _)
->
fail
;
true
).
:- func mode_error_conjunct_to_msgs(prog_varset, prog_context, mode_info,
delayed_goal) = list(error_msg).
mode_error_conjunct_to_msgs(VarSet, Context, !.ModeInfo, DelayedGoal) = Msgs :-
DelayedGoal = delayed_goal(Vars, Error, Goal),
set.to_sorted_list(Vars, VarList),
Pieces1 = [words("Floundered goal, waiting on {"),
words(mercury_vars_to_string(VarList, VarSet, no)),
words("}:"), nl],
Msg1 = simple_msg(Context,
[option_is_set(debug_modes, yes, [always(Pieces1)])]),
mode_info_get_module_info(!.ModeInfo, ModuleInfo),
Closure = write_indented_goal(Goal, ModuleInfo, VarSet),
Msg2 = error_msg(no, no, 0,
[option_is_set(very_verbose, yes,
[always([nl]), print_anything(Closure)])]),
Error = mode_error_info(_, ModeError, ErrorContext, ModeContext),
mode_info_set_context(ErrorContext, !ModeInfo),
mode_info_set_mode_context(ModeContext, !ModeInfo),
SubSpec = mode_error_to_spec(ModeError, !.ModeInfo),
SubSpec = error_spec(_, _, SubMsgs),
Msgs = [Msg1, Msg2] ++ SubMsgs.
:- pred write_indented_goal(hlds_goal::in, module_info::in, prog_varset::in,
io::di, io::uo) is det.
write_indented_goal(Goal, ModuleInfo, VarSet, !IO) :-
io.write_string("\t\t", !IO),
hlds_out.write_goal(Goal, ModuleInfo, VarSet, no, 2, ".\n", !IO).
%-----------------------------------------------------------------------------%
:- func mode_error_disj_to_spec(mode_info, merge_context, merge_errors)
= error_spec.
mode_error_disj_to_spec(ModeInfo, MergeContext, ErrorList) = Spec :-
Preamble = mode_info_context_preamble(ModeInfo),
mode_info_get_context(ModeInfo, Context),
MainPieces = [words("mode mismatch in "),
words(merge_context_to_string(MergeContext)), suffix("."), nl],
MergePieceLists = list.map(merge_error_to_pieces(ModeInfo), ErrorList),
list.condense(MergePieceLists, MergePieces),
Spec = error_spec(severity_error, phase_mode_check,
[simple_msg(Context,
[always(Preamble ++ MainPieces ++ MergePieces)])]).
:- func mode_error_par_conj_to_spec(mode_info, merge_errors) = error_spec.
mode_error_par_conj_to_spec(ModeInfo, ErrorList) = Spec :-
Preamble = mode_info_context_preamble(ModeInfo),
mode_info_get_context(ModeInfo, Context),
Pieces = [words("mode error: mutually exclusive bindings"),
words("in parallel conjunction."),
words("(The current implementation does not permit"),
words("parallel conjunctions to fail.)"), nl],
MergePieceLists = list.map(merge_error_to_pieces(ModeInfo), ErrorList),
list.condense(MergePieceLists, MergePieces),
Spec = error_spec(severity_error, phase_mode_check,
[simple_msg(Context,
[always(Preamble ++ Pieces ++ MergePieces)])]).
:- func merge_error_to_pieces(mode_info, merge_error) = list(format_component).
merge_error_to_pieces(ModeInfo, Var - Insts) = Pieces :-
mode_info_get_varset(ModeInfo, VarSet),
Pieces = [words(add_quotes(mercury_var_to_string(Var, VarSet, no))),
fixed("::"),
words(inst_list_to_string(ModeInfo, Insts)), suffix("."), nl].
:- func merge_context_to_string(merge_context) = string.
merge_context_to_string(disj) = "disjunction".
merge_context_to_string(if_then_else) = "if-then-else".
%-----------------------------------------------------------------------------%
:- func mode_error_bind_var_to_spec(mode_info, var_lock_reason,
prog_var, mer_inst, mer_inst) = error_spec.
mode_error_bind_var_to_spec(ModeInfo, Reason, Var, VarInst, Inst) = Spec :-
Preamble = mode_info_context_preamble(ModeInfo),
mode_info_get_context(ModeInfo, Context),
mode_info_get_varset(ModeInfo, VarSet),
(
Reason = var_lock_negation,
ReasonStr = "attempt to bind a non-local variable inside a negation."
;
Reason = var_lock_if_then_else,
ReasonStr = "attempt to bind a non-local variable" ++
" inside the condition of an if-then-else."
;
Reason = var_lock_lambda(PredOrFunc),
PredOrFuncS = prog_out.pred_or_func_to_str(PredOrFunc),
ReasonStr = "attempt to bind a non-local variable inside" ++
" a " ++ PredOrFuncS ++ " lambda goal."
;
Reason = var_lock_trace_goal,
ReasonStr = "attempt to bind a non-local variable inside a trace goal."
;
Reason = var_lock_par_conj,
ReasonStr = "attempt to bind a non-local variable" ++
" inside more than one parallel conjunct."
),
MainPieces = [words("scope error:"), words(ReasonStr), nl,
words("Variable"),
words(add_quotes(mercury_var_to_string(Var, VarSet, no))),
words("has instantiatedness"),
words(add_quotes(inst_to_string(ModeInfo, VarInst))), suffix(","), nl,
words("expected instantiatedness was"),
words(add_quotes(inst_to_string(ModeInfo, Inst))), suffix("."), nl],
(
Reason = var_lock_negation,
VerbosePieces =
[words("A negation is only allowed to bind variables"),
words("which are local to the negation, i.e. those which are"),
words("implicitly existentially quantified"),
words("inside the scope of the negation."), nl]
;
Reason = var_lock_if_then_else,
VerbosePieces =
[words("The condition of an if-then-else is only"),
words("allowed to bind variables which are local to the"),
words("condition or which occur only in the condition"),
words("and the `then' part."), nl]
;
Reason = var_lock_lambda(_),
VerbosePieces =
[words("A lambda goal is only allowed to bind"),
words("its arguments and variables local to the "),
words("lambda expression."), nl]
;
Reason = var_lock_trace_goal,
VerbosePieces =
[words("A trace goal is only allowed to bind variables"),
words("which are local to the trace goal."), nl]
;
Reason = var_lock_par_conj,
VerbosePieces =
[words("A nonlocal variable of a parallel conjunction"),
words("may be bound in at most one conjunct."), nl]
),
Spec = error_spec(severity_error, phase_mode_check,
[simple_msg(Context,
[always(Preamble ++ MainPieces), verbose_only(VerbosePieces)])]).
%-----------------------------------------------------------------------------%
:- func mode_error_non_local_lambda_var_to_spec(mode_info, prog_var, mer_inst)
= error_spec.
mode_error_non_local_lambda_var_to_spec(ModeInfo, Var, VarInst) = Spec :-
Preamble = mode_info_context_preamble(ModeInfo),
mode_info_get_context(ModeInfo, Context),
mode_info_get_varset(ModeInfo, VarSet),
Pieces = [words("mode error: variable"),
fixed(add_quotes(mercury_var_to_string(Var, VarSet, no))),
words("has instantiatedness"),
words(add_quotes(inst_to_string(ModeInfo, VarInst))),
suffix(","), nl,
words("expected instantiatedness for non-local variables"),
words("of lambda goals is `ground'."), nl],
Spec = error_spec(severity_error, phase_mode_check,
[simple_msg(Context, [always(Preamble ++ Pieces)])]).
%-----------------------------------------------------------------------------%
:- func mode_error_in_callee_to_spec(mode_info, list(prog_var), list(mer_inst),
pred_id, proc_id, list(mode_error_info)) = error_spec.
mode_error_in_callee_to_spec(!.ModeInfo, Vars, Insts,
CalleePredId, CalleeProcId, CalleeModeErrors) = Spec :-
Preamble = mode_info_context_preamble(!.ModeInfo),
mode_info_get_module_info(!.ModeInfo, ModuleInfo),
mode_info_get_context(!.ModeInfo, Context),
mode_info_get_varset(!.ModeInfo, VarSet),
MainPieces = [words("mode error: arguments"),
words(add_quotes(mercury_vars_to_string(Vars, VarSet, no))),
words("have the following insts:"), nl_indent_delta(1)] ++
inst_list_to_sep_lines(!.ModeInfo, Insts) ++
[words("which does not match any of the valid modes for")],
CalleePredIdPieces = describe_one_pred_name(ModuleInfo,
should_module_qualify, CalleePredId),
VerboseCalleePieces = [words("the callee"), prefix("(")] ++
CalleePredIdPieces ++
[suffix(")"), nl, words("because of the following error."), nl],
VerbosePieces = MainPieces ++ VerboseCalleePieces,
NonVerboseCalleePieces =
[words("the callee, because of the following error."), nl],
NonVerbosePieces = MainPieces ++ NonVerboseCalleePieces,
InitMsg = simple_msg(Context,
[always(Preamble),
verbose_and_nonverbose(VerbosePieces, NonVerbosePieces)]),
(
CalleeModeErrors = [First | _],
First = mode_error_info(_, CalleeModeError,
CalleeContext, CalleeModeContext),
mode_info_set_predid(CalleePredId, !ModeInfo),
mode_info_set_procid(CalleeProcId, !ModeInfo),
mode_info_set_context(CalleeContext, !ModeInfo),
mode_info_set_mode_context(CalleeModeContext, !ModeInfo),
CalleeModeErrorSpec = mode_error_to_spec(CalleeModeError, !.ModeInfo),
CalleeModeErrorSpec = error_spec(_, _, LaterMsgs0),
(
LaterMsgs0 = [],
LaterMsgs = []
;
LaterMsgs0 = [LaterHead0 | LaterTail],
(
LaterHead0 = simple_msg(LaterContext, Components),
LaterHead = error_msg(yes(LaterContext), yes, 0, Components)
;
LaterHead0 = error_msg(MaybeLaterContext, _, Indent,
Components),
LaterHead = error_msg(MaybeLaterContext, yes, Indent,
Components)
),
LaterMsgs = [LaterHead | LaterTail]
),
Spec = error_spec(severity_error, phase_mode_check,
[InitMsg | LaterMsgs])
;
CalleeModeErrors = [],
unexpected(this_file, "report_mode_error_in_callee: no error")
).
:- func mode_error_no_matching_mode_to_spec(mode_info, list(prog_var),
list(mer_inst)) = error_spec.
mode_error_no_matching_mode_to_spec(ModeInfo, Vars, Insts) = Spec :-
Preamble = mode_info_context_preamble(ModeInfo),
mode_info_get_context(ModeInfo, Context),
mode_info_get_varset(ModeInfo, VarSet),
mode_info_get_mode_context(ModeInfo, ModeContext),
( ModeContext = mode_context_call(CallId, _) ->
CallIdStr = hlds_out.call_id_to_string(CallId)
;
unexpected(this_file,
"report_mode_error_no_matching_mode: invalid context")
),
Pieces = [words("mode error: arguments"),
fixed(add_quotes(mercury_vars_to_string(Vars, VarSet, no))),
words("have the following insts:"), nl_indent_delta(1)] ++
inst_list_to_sep_lines(ModeInfo, Insts) ++
[words("which does not match any of the modes for"),
words(CallIdStr), suffix("."), nl],
Spec = error_spec(severity_error, phase_mode_check,
[simple_msg(Context, [always(Preamble ++ Pieces)])]).
:- func mode_error_higher_order_pred_var_to_spec(mode_info, pred_or_func,
prog_var, mer_inst, arity) = error_spec.
mode_error_higher_order_pred_var_to_spec(ModeInfo, PredOrFunc, Var, VarInst,
Arity) = Spec :-
Preamble = mode_info_context_preamble(ModeInfo),
mode_info_get_context(ModeInfo, Context),
mode_info_get_varset(ModeInfo, VarSet),
(
PredOrFunc = predicate,
Expecting = "expecting higher-order pred inst (of arity " ++
int_to_string(Arity) ++ ")."
;
PredOrFunc = function,
Expecting = "expecting higher-order func inst (of arity " ++
int_to_string(Arity - 1) ++ ")."
),
Pieces = [words("mode error: variable"),
fixed(add_quotes(mercury_var_to_string(Var, VarSet, no))),
words("has instantiatedness"),
words(add_quotes(inst_to_string(ModeInfo, VarInst))),
suffix(","), nl,
words(Expecting), nl],
Spec = error_spec(severity_error, phase_mode_check,
[simple_msg(Context, [always(Preamble ++ Pieces)])]).
:- func mode_error_poly_unify_to_spec(mode_info, prog_var, mer_inst)
= error_spec.
mode_error_poly_unify_to_spec(ModeInfo, Var, VarInst) = Spec :-
Preamble = mode_info_context_preamble(ModeInfo),
mode_info_get_context(ModeInfo, Context),
mode_info_get_varset(ModeInfo, VarSet),
MainPieces = [words("in polymorphically-typed unification:"), nl,
words("mode error: variable"),
words(add_quotes(mercury_var_to_string(Var, VarSet, no))),
words("has instantiatedness"),
words(add_quotes(inst_to_string(ModeInfo, VarInst))), suffix(","), nl,
words("expected instantiatedness was `ground' or `any'."), nl],
VerbosePieces = [words("When unifying two variables whose type"),
words("will not be known until runtime, the variables must both"),
words("be ground (or have inst `any'). Unifications of"),
words("polymorphically-typed variables with partially"),
words("instantiated modes are not allowed.")],
Spec = error_spec(severity_error, phase_mode_check,
[simple_msg(Context,
[always(Preamble ++ MainPieces), verbose_only(VerbosePieces)])]).
:- func mode_error_var_is_live_to_spec(mode_info, prog_var) = error_spec.
mode_error_var_is_live_to_spec(ModeInfo, Var) = Spec :-
Preamble = mode_info_context_preamble(ModeInfo),
mode_info_get_context(ModeInfo, Context),
mode_info_get_varset(ModeInfo, VarSet),
Pieces = [words("unique-mode error: the called procedure"),
words("would clobber its argument, but variable"),
words(add_quotes(mercury_var_to_string(Var, VarSet, no))),
words("is still live."), nl],
Spec = error_spec(severity_error, phase_mode_check,
[simple_msg(Context, [always(Preamble ++ Pieces)])]).
:- func mode_error_var_has_inst_to_spec(mode_info, prog_var,
mer_inst, mer_inst) = error_spec.
mode_error_var_has_inst_to_spec(ModeInfo, Var, VarInst, Inst) = Spec :-
Preamble = mode_info_context_preamble(ModeInfo),
mode_info_get_context(ModeInfo, Context),
mode_info_get_varset(ModeInfo, VarSet),
Pieces = [words("mode error: variable"),
words(add_quotes(mercury_var_to_string(Var, VarSet, no))),
words("has instantiatedness"),
words(add_quotes(inst_to_string(ModeInfo, VarInst))), suffix(","), nl,
words("expected instantiatedness was"),
words(add_quotes(inst_to_string(ModeInfo, Inst))), suffix("."), nl],
Spec = error_spec(severity_error, phase_mode_check,
[simple_msg(Context, [always(Preamble ++ Pieces)])]).
:- func mode_error_implied_mode_to_spec(mode_info, prog_var,
mer_inst, mer_inst) = error_spec.
mode_error_implied_mode_to_spec(ModeInfo, Var, VarInst, Inst) = Spec :-
% This "error" message is really a "sorry, not implemented" message.
% We only print the message if we will actually generating code.
Preamble = mode_info_context_preamble(ModeInfo),
mode_info_get_context(ModeInfo, Context),
mode_info_get_varset(ModeInfo, VarSet),
Pieces = [words("sorry, implied modes not implemented."), nl,
words("Variable"),
words(add_quotes(mercury_var_to_string(Var, VarSet, no))),
words("has instantiatedness"),
words(add_quotes(inst_to_string(ModeInfo, VarInst))),
suffix(","), nl,
words("expected instantiatedness was"),
words(add_quotes(inst_to_string(ModeInfo, Inst))),
suffix("."), nl],
Severity = severity_conditional(errorcheck_only, no, severity_error, no),
Spec = error_spec(Severity, phase_mode_check,
[simple_msg(Context,
[option_is_set(errorcheck_only, no,
[always(Preamble ++ Pieces)])])]).
:- func mode_error_no_mode_decl_to_spec(mode_info) = error_spec.
mode_error_no_mode_decl_to_spec(ModeInfo) = Spec :-
Preamble = mode_info_context_preamble(ModeInfo),
mode_info_get_context(ModeInfo, Context),
Pieces = [words("no mode declaration for called predicate."), nl],
Spec = error_spec(severity_error, phase_mode_check,
[simple_msg(Context, [always(Preamble ++ Pieces)])]).
:- func mode_error_unify_pred_to_spec(mode_info, prog_var,
mode_error_unify_rhs, mer_type, pred_or_func) = error_spec.
mode_error_unify_pred_to_spec(ModeInfo, X, RHS, Type, PredOrFunc) = Spec :-
Preamble = mode_info_context_preamble(ModeInfo),
mode_info_get_context(ModeInfo, Context),
mode_info_get_varset(ModeInfo, VarSet),
mode_info_get_instvarset(ModeInfo, InstVarSet),
mode_info_get_module_info(ModeInfo, ModuleInfo),
(
RHS = error_at_var(Y),
RHSStr = mercury_var_to_string(Y, VarSet, no)
;
RHS = error_at_functor(ConsId, ArgVars),
RHSStr = hlds_out.functor_cons_id_to_string(ConsId, ArgVars, VarSet,
ModuleInfo, no)
;
RHS = error_at_lambda(ArgVars, ArgModes),
RHSStr = "lambda(["
++ hlds_out.var_modes_to_string(ArgVars, ArgModes, VarSet,
InstVarSet, no)
++ "] ... )"
),
varset.init(TypeVarSet),
MainPieces = [words("In unification of"),
words(add_quotes(mercury_var_to_string(X, VarSet, no))),
words("with"), words(add_quotes(RHSStr)), suffix(":"), nl,
words("mode error: attempt at higher-order unification."), nl,
words("Cannot unify two terms of type"),
words(add_quotes(mercury_type_to_string(TypeVarSet, no, Type))),
suffix("."), nl],
VerbosePieces = [words("Your code is trying to test whether two "),
words(prog_out.pred_or_func_to_full_str(PredOrFunc) ++ "s"),
words("are equal, by unifying them."),
words("In the general case, testing equivalence of"),
words(prog_out.pred_or_func_to_full_str(PredOrFunc) ++ "s"),
words("is an undecidable problem,"),
words("and so this is not allowed by the Mercury mode system."),
words("In some cases, you can achieve the same effect by"),
words("writing an explicit universal quantification, e.g."),
fixed("`all [X] call(P, X) <=> call(Q, X)',"),
words("instead of"), fixed("`P = Q'.")],
Spec = error_spec(severity_error, phase_mode_check,
[simple_msg(Context,
[always(Preamble ++ MainPieces), verbose_only(VerbosePieces)])]).
%-----------------------------------------------------------------------------%
:- func mode_error_unify_var_var_to_spec(mode_info, prog_var,
prog_var, mer_inst, mer_inst) = error_spec.
mode_error_unify_var_var_to_spec(ModeInfo, X, Y, InstX, InstY) = Spec :-
Preamble = mode_info_context_preamble(ModeInfo),
mode_info_get_context(ModeInfo, Context),
mode_info_get_varset(ModeInfo, VarSet),
Pieces = [words("mode error in unification of"),
words(add_quotes(mercury_var_to_string(X, VarSet, no))),
words("and"),
words(add_quotes(mercury_var_to_string(Y, VarSet, no))),
suffix("."), nl,
words("Variable"),
words(add_quotes(mercury_var_to_string(X, VarSet, no))),
words("has instantiatedness"),
words(add_quotes(inst_to_string(ModeInfo, InstX))), suffix(","), nl,
words("variable"),
words(add_quotes(mercury_var_to_string(Y, VarSet, no))),
words("has instantiatedness"),
words(add_quotes(inst_to_string(ModeInfo, InstY))), suffix("."), nl],
Spec = error_spec(severity_error, phase_mode_check,
[simple_msg(Context, [always(Preamble ++ Pieces)])]).
%-----------------------------------------------------------------------------%
:- func mode_error_unify_var_lambda_to_spec(mode_info, prog_var,
mer_inst, mer_inst) = error_spec.
mode_error_unify_var_lambda_to_spec(ModeInfo, X, InstX, InstY) = Spec :-
Preamble = mode_info_context_preamble(ModeInfo),
mode_info_get_context(ModeInfo, Context),
mode_info_get_varset(ModeInfo, VarSet),
Pieces = [words("mode error in unification of"),
words(add_quotes(mercury_var_to_string(X, VarSet, no))),
words("and lambda expression."), nl,
words("Variable"),
words(add_quotes(mercury_var_to_string(X, VarSet, no))),
words("has instantiatedness"),
words(add_quotes(inst_to_string(ModeInfo, InstX))), suffix(","), nl,
words("lambda expression has instantiatedness"),
words(add_quotes(inst_to_string(ModeInfo, InstY))), suffix("."), nl],
Spec = error_spec(severity_error, phase_mode_check,
[simple_msg(Context, [always(Preamble ++ Pieces)])]).
%-----------------------------------------------------------------------------%
:- func mode_error_unify_var_functor_to_spec(mode_info, prog_var,
cons_id, list(prog_var), mer_inst, list(mer_inst)) = error_spec.
mode_error_unify_var_functor_to_spec(ModeInfo, X, ConsId, Args,
InstX, ArgInsts) = Spec :-
Preamble = mode_info_context_preamble(ModeInfo),
mode_info_get_context(ModeInfo, Context),
mode_info_get_varset(ModeInfo, VarSet),
mode_info_get_module_info(ModeInfo, ModuleInfo),
Pieces1 = [words("mode error in unification of"),
words(add_quotes(mercury_var_to_string(X, VarSet, no))),
words("and"),
words(add_quotes(hlds_out.functor_cons_id_to_string(ConsId, Args,
VarSet, ModuleInfo, no))), suffix("."), nl,
words("Variable"),
words(add_quotes(mercury_var_to_string(X, VarSet, no))),
words("has instantiatedness"),
words(add_quotes(inst_to_string(ModeInfo, InstX))), suffix(","), nl,
words("term"),
words(add_quotes(hlds_out.functor_cons_id_to_string(ConsId, Args,
VarSet, ModuleInfo, no)))],
(
Args = [_ | _],
Pieces2 = [words("has instantiatedness"),
prefix("`"),
words(mercury_cons_id_to_string(ConsId, does_not_need_brackets)),
suffix("("), nl_indent_delta(1)] ++
inst_list_to_sep_lines(ModeInfo, ArgInsts) ++
[fixed(")'.")]
;
Args = [],
Pieces2 = [words("has instantiatedness"),
words(add_quotes(mercury_cons_id_to_string(ConsId,
does_not_need_brackets))), suffix("."), nl]
),
Spec = error_spec(severity_error, phase_mode_check,
[simple_msg(Context, [always(Preamble ++ Pieces1 ++ Pieces2)])]).
%-----------------------------------------------------------------------------%
:- func mode_warning_cannot_succeed_var_var(mode_info,
prog_var, prog_var, mer_inst, mer_inst) = error_spec.
mode_warning_cannot_succeed_var_var(ModeInfo, X, Y, InstX, InstY) = Spec :-
Preamble = mode_info_context_preamble(ModeInfo),
mode_info_get_context(ModeInfo, Context),
mode_info_get_varset(ModeInfo, VarSet),
Pieces = [words("warning: unification of"),
words(add_quotes(mercury_var_to_string(X, VarSet, no))),
words("and"),
words(add_quotes(mercury_var_to_string(Y, VarSet, no))),
words("cannot succeed"), nl,
words(add_quotes(mercury_var_to_string(X, VarSet, no))),
words("has instantiatedness"),
words(add_quotes(inst_to_string(ModeInfo, InstX))), suffix(","), nl,
words(add_quotes(mercury_var_to_string(Y, VarSet, no))),
words("has instantiatedness"),
words(add_quotes(inst_to_string(ModeInfo, InstY))), suffix("."), nl],
Spec = error_spec(severity_warning, phase_mode_check,
[simple_msg(Context, [always(Preamble ++ Pieces)])]).
:- func mode_warning_cannot_succeed_var_functor(mode_info, prog_var, mer_inst,
cons_id) = error_spec.
mode_warning_cannot_succeed_var_functor(ModeInfo, X, InstX, ConsId) = Spec :-
Preamble = mode_info_context_preamble(ModeInfo),
mode_info_get_context(ModeInfo, Context),
mode_info_get_varset(ModeInfo, VarSet),
Pieces = [words("warning: unification of"),
words(add_quotes(mercury_var_to_string(X, VarSet, no))),
words("and"),
words(mercury_cons_id_to_string(ConsId, does_not_need_brackets)),
words("cannot succeed"), nl,
words(add_quotes(mercury_var_to_string(X, VarSet, no))),
words("has instantiatedness"),
words(add_quotes(inst_to_string(ModeInfo, InstX))), suffix("."), nl],
Spec = error_spec(severity_warning, phase_mode_check,
[simple_msg(Context, [always(Preamble ++ Pieces)])]).
%-----------------------------------------------------------------------------%
:- func mode_info_context_preamble(mode_info) = list(format_component).
mode_info_context_preamble(ModeInfo) = Pieces :-
mode_info_get_module_info(ModeInfo, ModuleInfo),
mode_info_get_context(ModeInfo, Context),
mode_info_get_predid(ModeInfo, PredId),
mode_info_get_procid(ModeInfo, ProcId),
module_info_pred_proc_info(ModuleInfo, PredId, ProcId,
PredInfo, ProcInfo),
PredOrFunc = pred_info_is_pred_or_func(PredInfo),
pred_info_get_markers(PredInfo, PredMarkers),
proc_info_declared_argmodes(ProcInfo, Modes0),
strip_builtin_qualifiers_from_mode_list(Modes0, Modes),
Name0 = pred_info_name(PredInfo),
Name = unqualified(Name0),
mode_info_get_instvarset(ModeInfo, InstVarSet),
MaybeDet = no,
ModeSubDeclStr = mercury_mode_subdecl_to_string(PredOrFunc, InstVarSet,
Name, Modes, MaybeDet, Context),
Pieces1 = [words("In clause for"),
words(add_quotes(ModeSubDeclStr)), suffix(":"), nl],
mode_info_get_mode_context(ModeInfo, ModeContext),
Pieces2 = mode_context_to_pieces(ModeContext, PredMarkers),
Pieces = Pieces1 ++ Pieces2.
%-----------------------------------------------------------------------------%
% XXX some parts of the mode context never get set up
:- func mode_context_to_pieces(mode_context, pred_markers)
= list(format_component).
mode_context_to_pieces(mode_context_uninitialized, _Markers) = [].
mode_context_to_pieces(mode_context_call(CallId, ArgNum), Markers) =
[words("in"),
words(hlds_out.call_arg_id_to_string(CallId, ArgNum, Markers)),
suffix(":"), nl].
mode_context_to_pieces(mode_context_unify(UnifyContext, _Side), _Markers)
= Pieces :-
unify_context_first_to_pieces(no, _, UnifyContext, [], Pieces).
%-----------------------------------------------------------------------------%
mode_context_init(mode_context_uninitialized).
%-----------------------------------------------------------------------------%
:- func mode_error_final_inst_to_spec(mode_info, int, prog_var,
mer_inst, mer_inst, final_inst_error) = error_spec.
mode_error_final_inst_to_spec(ModeInfo, ArgNum, Var, VarInst, Inst, Reason)
= Spec :-
Preamble = mode_info_context_preamble(ModeInfo),
mode_info_get_context(ModeInfo, Context),
mode_info_get_varset(ModeInfo, VarSet),
( Reason = too_instantiated ->
Problem = " became too instantiated."
; Reason = not_instantiated_enough ->
Problem = "did not get sufficiently instantiated."
;
% I don't think this can happen. But just in case...
Problem = "had the wrong instantiatedness."
),
Pieces = [words("mode error: argument"), fixed(int_to_string(ArgNum)),
words(Problem), nl,
words("Final instantiatedness of"),
words(add_quotes(mercury_var_to_string(Var, VarSet, no))),
words("was"), words(add_quotes(inst_to_string(ModeInfo, VarInst))),
suffix(","), nl,
words("expected final instantiatedness was"),
words(add_quotes(inst_to_string(ModeInfo, Inst))),
suffix("."), nl],
Spec = error_spec(severity_error, phase_mode_check,
[simple_msg(Context, [always(Preamble ++ Pieces)])]).
%-----------------------------------------------------------------------------%
:- func purity_error_should_be_in_promise_purity_scope_to_spec(
negated_context_desc, mode_info, prog_var) = error_spec.
purity_error_should_be_in_promise_purity_scope_to_spec(NegCtxtDesc,
ModeInfo, Var) = Spec :-
Preamble = mode_info_context_preamble(ModeInfo),
mode_info_get_context(ModeInfo, Context),
mode_info_get_varset(ModeInfo, VarSet),
(
NegCtxtDesc = if_then_else,
Pieces = [
words("purity error: if-then-else"),
words("should be inside a promise_purity"),
words("scope because non-local variable"),
words(mercury_var_to_string(Var, VarSet, no)),
words("has inst any and appears in the condition.")
]
;
NegCtxtDesc = negation,
Pieces = [
words("purity error: negation"),
words("should be inside a promise_purity"),
words("scope because non-local variable"),
words(mercury_var_to_string(Var, VarSet, no)),
words("has inst any and appears in the body.")
]
),
Spec = error_spec(severity_error, phase_mode_check,
[simple_msg(Context, [always(Preamble ++ Pieces)])]).
%-----------------------------------------------------------------------------%
:- func purity_error_lambda_should_be_impure_to_spec(mode_info, list(prog_var))
= error_spec.
purity_error_lambda_should_be_impure_to_spec(ModeInfo, Vars) = Spec :-
Preamble = mode_info_context_preamble(ModeInfo),
mode_info_get_context(ModeInfo, Context),
mode_info_get_varset(ModeInfo, VarSet),
Pieces = [
words("purity error: lambda should be impure because it"),
words("contains the following non-local variables"),
words("whose insts contain `any':"),
words(mercury_vars_to_string(Vars, VarSet, no)),
suffix("."), nl
],
Spec = error_spec(severity_error, phase_mode_check,
[simple_msg(Context, [always(Preamble ++ Pieces)])]).
%-----------------------------------------------------------------------------%
maybe_report_error_no_modes(PredId, PredInfo, !ModuleInfo, !IO) :-
pred_info_get_import_status(PredInfo, ImportStatus),
( ImportStatus = status_local ->
globals.io_lookup_bool_option(infer_modes, InferModesOpt, !IO),
(
InferModesOpt = yes
;
InferModesOpt = no,
io.set_exit_status(1, !IO),
pred_info_context(PredInfo, Context),
MainPieces = [words("Error: no mode declaration for")] ++
describe_one_pred_name(!.ModuleInfo, should_not_module_qualify,
PredId) ++ [suffix("."), nl],
VerbosePieces =
[words("(Use `--infer-modes' to enable mode inference.)"), nl],
Spec = error_spec(severity_error, phase_mode_check,
[simple_msg(Context,
[always(MainPieces), verbose_only(VerbosePieces)])]),
write_error_spec(Spec, 0, _NumWarnings, 0, NumErrors, !IO),
module_info_incr_num_errors(NumErrors, !ModuleInfo)
)
;
io.set_exit_status(1, !IO),
pred_info_context(PredInfo, Context),
Pieces = [words("Error: no mode declaration for exported")] ++
describe_one_pred_name(!.ModuleInfo, should_module_qualify, PredId)
++ [suffix("."), nl],
Spec = error_spec(severity_error, phase_mode_check,
[simple_msg(Context, [always(Pieces)])]),
write_error_spec(Spec, 0, _NumWarnings, 0, NumErrors, !IO),
module_info_incr_num_errors(NumErrors, !ModuleInfo)
).
%-----------------------------------------------------------------------------%
% Write out the inferred `mode' declarations for a list of pred_ids.
%
write_mode_inference_messages([], _, _, !IO).
write_mode_inference_messages([PredId | PredIds], OutputDetism, ModuleInfo,
!IO) :-
module_info_pred_info(ModuleInfo, PredId, PredInfo),
pred_info_get_markers(PredInfo, Markers),
( check_marker(Markers, marker_infer_modes) ->
ProcIds = pred_info_all_procids(PredInfo),
pred_info_get_procedures(PredInfo, Procs),
write_mode_inference_messages_2(ProcIds, Procs, PredInfo,
OutputDetism, ModuleInfo, !IO)
;
true
),
write_mode_inference_messages(PredIds, OutputDetism, ModuleInfo, !IO).
% Write out the inferred `mode' declarations for a list of proc_ids.
%
:- pred write_mode_inference_messages_2(list(proc_id)::in, proc_table::in,
pred_info::in, bool::in, module_info::in, io::di, io::uo) is det.
write_mode_inference_messages_2([], _, _, _, _, !IO).
write_mode_inference_messages_2([ProcId | ProcIds], Procs, PredInfo,
OutputDetism, ModuleInfo, !IO) :-
globals.io_lookup_bool_option(verbose_errors, VerboseErrors, !IO),
map.lookup(Procs, ProcId, ProcInfo),
(
(
% We always output `Inferred :- mode ...'
proc_info_is_valid_mode(ProcInfo)
;
% We only output `REJECTED :- mode ...'
% if --verbose-errors is enabled
VerboseErrors = yes
)
->
write_mode_inference_message(PredInfo, ProcInfo, OutputDetism,
ModuleInfo, !IO)
;
true
),
write_mode_inference_messages_2(ProcIds, Procs, PredInfo, OutputDetism,
ModuleInfo, !IO).
% Write out the inferred `mode' declaration for a single function
% or predicate.
%
:- pred write_mode_inference_message(pred_info::in, proc_info::in, bool::in,
module_info::in, io::di, io::uo) is det.
write_mode_inference_message(PredInfo, ProcInfo, OutputDetism, ModuleInfo,
!IO) :-
PredName = pred_info_name(PredInfo),
Name = unqualified(PredName),
pred_info_context(PredInfo, Context),
PredArity = pred_info_orig_arity(PredInfo),
some [!ArgModes, !MaybeDet] (
proc_info_get_argmodes(ProcInfo, !:ArgModes),
% We need to strip off the extra type_info arguments inserted at the
% front by polymorphism.m - we only want the last `PredArity' of them.
%
list.length(!.ArgModes, NumArgModes),
NumToDrop = NumArgModes - PredArity,
( list.drop(NumToDrop, !ArgModes) ->
true
;
unexpected(this_file, "report_pred_proc_id: list.drop failed")
),
varset.init(VarSet),
PredOrFunc = pred_info_is_pred_or_func(PredInfo),
(
OutputDetism = yes,
proc_info_get_inferred_determinism(ProcInfo, Detism),
!:MaybeDet = yes(Detism)
;
OutputDetism = no,
!:MaybeDet = no
),
( proc_info_is_valid_mode(ProcInfo) ->
Verb = "Inferred"
;
Verb = "REJECTED",
% Replace the final insts with dummy insts '...',
% since they won't be valid anyway -- they are just
% the results of whatever partial inference we did
% before detecting the error.
mode_list_get_initial_insts(ModuleInfo, !.ArgModes, InitialInsts),
DummyInst = defined_inst(user_inst(unqualified("..."), [])),
list.duplicate(PredArity, DummyInst, FinalInsts),
!:ArgModes = list.map(func(I - F) = (I -> F),
assoc_list.from_corresponding_lists(InitialInsts, FinalInsts)),
% Likewise delete the determinism.
!:MaybeDet = no
),
strip_builtin_qualifiers_from_mode_list(!ArgModes),
(
PredOrFunc = predicate,
Detail = mercury_pred_mode_decl_to_string(VarSet, Name,
!.ArgModes, !.MaybeDet, Context)
;
PredOrFunc = function,
pred_args_to_func_args(!.ArgModes, FuncArgModes, RetMode),
Detail = mercury_func_mode_decl_to_string(VarSet, Name,
FuncArgModes, RetMode, !.MaybeDet, Context)
),
Pieces = [words(Verb), words(Detail), nl],
Msg = simple_msg(Context, [always(Pieces)]),
Spec = error_spec(severity_informational, phase_mode_check, [Msg]),
write_error_spec(Spec, 0, _NumWarnings, 0, _NumErrors, !IO)
).
%-----------------------------------------------------------------------------%
report_indistinguishable_modes_error(ModuleInfo, OldProcId, NewProcId,
PredId, PredInfo) = Spec :-
pred_info_get_procedures(PredInfo, Procs),
map.lookup(Procs, OldProcId, OldProcInfo),
map.lookup(Procs, NewProcId, NewProcInfo),
proc_info_get_context(OldProcInfo, OldContext),
proc_info_get_context(NewProcInfo, NewContext),
MainPieces = [words("In mode declarations for ")] ++
describe_one_pred_name(ModuleInfo, should_module_qualify, PredId)
++ [suffix(":"), nl, words("error: duplicate mode declaration."), nl],
VerbosePieces = [words("Modes"),
fixed(add_quotes(mode_decl_to_string(OldProcId, PredInfo))),
words("and"),
fixed(add_quotes(mode_decl_to_string(NewProcId, PredInfo))),
words("are indistinguishable.")],
OldPieces = [words("Here is the conflicting mode declaration.")],
Spec = error_spec(severity_error, phase_mode_check,
[simple_msg(NewContext,
[always(MainPieces), verbose_only(VerbosePieces)]),
simple_msg(OldContext, [always(OldPieces)])]).
%-----------------------------------------------------------------------------%
mode_decl_to_string(ProcId, PredInfo) = String :-
PredOrFunc = pred_info_is_pred_or_func(PredInfo),
Name0 = pred_info_name(PredInfo),
Name = unqualified(Name0),
pred_info_get_procedures(PredInfo, Procs),
map.lookup(Procs, ProcId, ProcInfo),
proc_info_declared_argmodes(ProcInfo, Modes0),
proc_info_get_declared_determinism(ProcInfo, MaybeDet),
proc_info_get_context(ProcInfo, Context),
varset.init(InstVarSet),
strip_builtin_qualifiers_from_mode_list(Modes0, Modes),
String = mercury_mode_subdecl_to_string(PredOrFunc, InstVarSet, Name,
Modes, MaybeDet, Context).
:- pred output_inst(mer_inst::in, mode_info::in, io::di, io::uo) is det.
output_inst(Inst0, ModeInfo, !IO) :-
io.write_string(inst_to_string(ModeInfo, Inst0), !IO).
:- func inst_to_string(mode_info, mer_inst) = string.
inst_to_string(ModeInfo, Inst0) = Str :-
strip_builtin_qualifiers_from_inst(Inst0, Inst),
mode_info_get_instvarset(ModeInfo, InstVarSet),
mode_info_get_module_info(ModeInfo, ModuleInfo),
Str = mercury_expanded_inst_to_string(Inst, InstVarSet, ModuleInfo).
:- pred output_inst_list(list(mer_inst)::in, mode_info::in, io::di, io::uo)
is det.
output_inst_list(Insts, ModeInfo, !IO) :-
io.write_string(inst_list_to_string(ModeInfo, Insts), !IO).
:- func inst_list_to_string(mode_info, list(mer_inst)) = string.
inst_list_to_string(ModeInfo, Insts) =
string.join_list(", ", list.map(inst_to_string(ModeInfo), Insts)).
:- pred output_inst_list_sep_lines(prog_context::in, list(mer_inst)::in,
mode_info::in, io::di, io::uo) is det.
output_inst_list_sep_lines(_Context, [], _, !IO).
output_inst_list_sep_lines(Context, [Inst | Insts], ModeInfo, !IO) :-
prog_out.write_context(Context, !IO),
io.write_string(" ", !IO),
output_inst(Inst, ModeInfo, !IO),
(
Insts = []
;
Insts = [_ | _],
io.write_string(",", !IO)
),
io.nl(!IO),
output_inst_list_sep_lines(Context, Insts, ModeInfo, !IO).
:- func inst_list_to_sep_lines(mode_info, list(mer_inst))
= list(format_component).
inst_list_to_sep_lines(_ModeInfo, []) = [].
inst_list_to_sep_lines(ModeInfo, [Inst | Insts]) = Pieces ++ MorePieces :-
(
Insts = [],
Comma = [],
Newline = nl_indent_delta(-1)
;
Insts = [_ | _],
Comma = [suffix(",")],
Newline = nl
),
Pieces = [words(inst_to_string(ModeInfo, Inst))] ++ Comma ++ [Newline],
MorePieces = inst_list_to_sep_lines(ModeInfo, Insts).
%-----------------------------------------------------------------------------%
:- func this_file = string.
this_file = "mode_errors.m".
%-----------------------------------------------------------------------------%
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