mercurylang/mercury
1
0
Fork 0
mirror of https://github.com/Mercury-Language/mercury.git synced 2025-12-15 05:44:58 +00:00
Code Issues Projects Releases Wiki Activity
Files
0ac3ffa3044dbe7ce1ea7c6dc567fdc7794b46c4
mercury/compiler/mode_errors.m
Fergus Henderson 0ac3ffa304 Four loosely related changes to improve mode inference. 
Estimated hours taken: 12

Four loosely related changes to improve mode inference.

--------------------

(1) Fix a problem with inference of unique modes.

Previously it was sufficient to just look at the final insts of the
mode and check whether they were `clobbered' or not in order to tell
which arguments will be dead on exit from this procedure.  However,
that doesn't work for inferred modes, where the final inst will
initially be `not_reached'.  Previously mode inference just assumed that
all arguments to a predicate were live, but that prevents it from being
able to infer `di' modes.  So I've added a new field to the proc_info
to record which arguments are required to be dead on exit.
I've also changed mode analysis so that it checks that such
arguments really are dead.  This means you can declare both `di' and
`ui' modes of a predicate, and so long as you declare the `di' one
first, mode checking should handle this overloading.  It also means
that errors such as passing a variable which is live to a procedure with
a `di' mode argument are caught earlier, with a potentially better
error message; mode checking may also be able to reorder such calls,
so that the `di' mode pred is scheduled last.  Mode inference now
notices if an argument is dead, and if so will try infering a `di'
mode.

hlds_pred.m:
	Add a new field to the proc_info, the `maybe_arglives', of type
	`maybe(list(is_live))'.  If set, this records whether or not the
	arguments are required to be dead after the procedure or not.
	Add an access predicate which checks whether this is set,
	and returns either the value set, or if no value special value
	is set, looks up a value based on the modes by calling get_arg_lives
	from mode_util.m.

make_hlds.m:
	Add a MaybeArgLives parameter to add_new_pred.
	(Also change the error messages about pragmas to reflect
	the new pragma syntax.)

clause_to_proc.m, unify_proc.m:
	Pass MaybeArgLives = no to add_new_pred.

modes.m, mode_errors.m:
	Use the new arglives field.  When mode-checking a call (or
	higher-order call), check that all the variables which are
	required to be dead really are dead.

unique_modes.m:
	Use the new arglives field.

mode_util.m:
	Add predicate `get_arg_lives', for use by modes.m and hlds_pred.m.

--------------------

(2) Fix a problem with mode inference looping.

It was checking whether a fixpoint had been reached by comparing the
(un-normalised) inferred final insts with the previously recorded final
insts (which had been normalised).  Instead, it has to normalise the
insts before the comparison.

modes.m:
	When doing mode analysis of an inferred mode, normalise the insts
	before checking whether they've changed, rather than vice versa.

--------------------

(3) Fix a problem with the computation of liveness for mode-analysis
of if-then-elses that was detected when I tried to bootcheck the above
changes.

modes.m, unique_modes.m:
	When mode-checking if-then-elses, the variables in the "else"
	should not be considered live when checking the condition.
	(They're nondet-live, but not live with regard to forward execution.)

--------------------

(4) Reduce the occurrence of mode inference inferring spurious
`in(not_reached)' modes.

modes.m:
	If the top-level inst of a variable becomes `not_reached', set
	the whole instmap to `unreachable'.
1996-05-27 17:15:08 +00:00

864 lines
32 KiB
Mathematica
Raw Blame History

%-----------------------------------------------------------------------------%
% Copyright (C) 1995 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 mode_errors.
:- interface.
:- import_module prog_data, mode_info.
:- import_module set, assoc_list.
%-----------------------------------------------------------------------------%
:- type merge_context
---> disj
; if_then_else.
:- type merge_errors == assoc_list(var, list(inst)).
:- type delayed_goal
---> delayed_goal(
set(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_higher_order_pred_var(pred_or_func, var, 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_var_is_live(var)
% call to a predicate which will clobber its argument,
% but the argument is still live
; mode_error_var_has_inst(var, inst, inst)
% call to a predicate with an insufficiently
% instantiated variable (for preds with one mode)
; mode_error_unify_pred(var, mode_error_unify_rhs, type,
pred_or_func)
% an attempt was made to unify two higher-order
% predicate or function variables.
; mode_error_implied_mode(var, inst, inst)
% a call to a predicate with an overly
% instantiated variable would use an implied
% mode of the predicate. XXX This is temporary -
% once we've implemented implied modes we can
% get rid of it.
; mode_error_no_mode_decl
% a call to a predicate for which there are
% no mode declarations
; mode_error_no_matching_mode(list(var), list(inst))
% call to a predicate with an insufficiently
% instantiated variable (for preds with >1 mode)
; mode_error_bind_var(var, inst, inst)
% attempt to bind a non-local variable inside
% a negated context
; mode_error_unify_var_var(var, var, inst, inst)
% attempt to unify two free variables
; mode_error_unify_var_functor(var, const, list(var),
inst, list(inst))
% attempt to unify a free var with a functor containing
% free arguments
; mode_error_unify_var_lambda(var, inst, inst)
% some sort of error in
% attempt to unify a variable with lambda expression
; mode_error_conj(list(delayed_goal))
% a conjunction contains one or more unscheduleable
% goals
; mode_error_final_inst(int, var, inst, inst, final_inst_error).
% one of the head variables did not have the
% expected final inst on exit from the proc
:- 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(var)
; error_at_functor(const, list(var))
; error_at_lambda(list(var), list(mode)).
:- type mode_error_info
---> mode_error_info(
set(var), % the variables which caused the error
% (we will attempt to reschedule the goal
% if the one of these variables becomes
% more instantiated)
mode_error, % the nature of the error
term__context, % where the error occurred
mode_context % where the error occurred
).
%-----------------------------------------------------------------------------%
% print an error message describing a mode error
:- pred report_mode_error(mode_error, mode_info, io__state, io__state).
:- mode report_mode_error(in, mode_info_no_io, di, uo) is det.
% report an error for a predicate with no mode declarations
% unless mode inference is enabled and the predicate is local.
:- pred maybe_report_error_no_modes(pred_id, pred_info, module_info,
io__state, io__state).
:- mode maybe_report_error_no_modes(in, in, in, di, uo) is det.
% initialize the mode_context.
:- pred mode_context_init(mode_context).
:- mode mode_context_init(out) is det.
% write out the inferred `mode' declarations for a list of pred_ids.
:- pred write_mode_inference_messages(list(pred_id), module_info,
io__state, io__state).
:- mode write_mode_inference_messages(in, in, di, uo) is det.
%-----------------------------------------------------------------------------%
%-----------------------------------------------------------------------------%
:- implementation.
:- import_module hlds_module, hlds_pred, hlds_goal, hlds_out.
:- import_module mode_info, prog_out, mercury_to_mercury.
:- import_module options, globals.
:- import_module bool, int, list, map, io, term, term_io, varset.
:- import_module std_util, require.
% just dispatch on the diffferent sorts of mode errors
report_mode_error(mode_error_disj(MergeContext, ErrorList), ModeInfo) -->
report_mode_error_disj(ModeInfo, MergeContext, ErrorList).
report_mode_error(mode_error_higher_order_pred_var(PredOrFunc, Var, Inst,
Arity), ModeInfo) -->
report_mode_error_higher_order_pred_var(ModeInfo, PredOrFunc, Var,
Inst, Arity).
report_mode_error(mode_error_var_is_live(Var), ModeInfo) -->
report_mode_error_var_is_live(ModeInfo, Var).
report_mode_error(mode_error_var_has_inst(Var, InstA, InstB), ModeInfo) -->
report_mode_error_var_has_inst(ModeInfo, Var, InstA, InstB).
report_mode_error(mode_error_unify_pred(Var, RHS, Type, PredOrFunc),
ModeInfo) -->
report_mode_error_unify_pred(ModeInfo, Var, RHS, Type, PredOrFunc).
report_mode_error(mode_error_implied_mode(Var, InstA, InstB), ModeInfo) -->
report_mode_error_implied_mode(ModeInfo, Var, InstA, InstB).
report_mode_error(mode_error_no_mode_decl, ModeInfo) -->
report_mode_error_no_mode_decl(ModeInfo).
report_mode_error(mode_error_bind_var(Var, InstA, InstB), ModeInfo) -->
report_mode_error_bind_var(ModeInfo, Var, InstA, InstB).
report_mode_error(mode_error_unify_var_var(VarA, VarB, InstA, InstB),
ModeInfo) -->
report_mode_error_unify_var_var(ModeInfo, VarA, VarB, InstA, InstB).
report_mode_error(mode_error_unify_var_lambda(VarA, InstA, InstB),
ModeInfo) -->
report_mode_error_unify_var_lambda(ModeInfo, VarA, InstA, InstB).
report_mode_error(mode_error_unify_var_functor(Var, Name, Args, Inst,
ArgInsts), ModeInfo) -->
report_mode_error_unify_var_functor(ModeInfo, Var, Name, Args, Inst,
ArgInsts).
report_mode_error(mode_error_conj(Errors), ModeInfo) -->
report_mode_error_conj(ModeInfo, Errors).
report_mode_error(mode_error_no_matching_mode(Vars, Insts), ModeInfo) -->
report_mode_error_no_matching_mode(ModeInfo, Vars, Insts).
report_mode_error(mode_error_final_inst(ArgNum, Var, VarInst, Inst, Reason),
ModeInfo) -->
report_mode_error_final_inst(ModeInfo, ArgNum, Var, VarInst, Inst,
Reason).
%-----------------------------------------------------------------------------%
:- pred report_mode_error_conj(mode_info, list(delayed_goal),
io__state, io__state).
:- mode report_mode_error_conj(mode_info_no_io, in, di, uo) is det.
report_mode_error_conj(ModeInfo, Errors) -->
{ mode_info_get_context(ModeInfo, Context) },
{ mode_info_get_varset(ModeInfo, VarSet) },
{ find_important_errors(Errors, ImportantErrors, OtherErrors) },
globals__io_lookup_bool_option(verbose_errors, VerboseErrors),
( { VerboseErrors = yes } ->
mode_info_write_context(ModeInfo),
prog_out__write_context(Context),
io__write_string(" mode error in conjunction. The next "),
{ list__length(Errors, NumErrors) },
io__write_int(NumErrors),
io__write_string(" error messages\n"),
prog_out__write_context(Context),
io__write_string(" indicate possible causes of this error.\n"),
report_mode_error_conj_2(ImportantErrors, VarSet, Context,
ModeInfo),
report_mode_error_conj_2(OtherErrors, VarSet, Context, ModeInfo)
;
% in the normal case, only report the first error
{ ImportantErrors = [FirstImportantError | _] }
->
report_mode_error_conj_2([FirstImportantError], VarSet, Context,
ModeInfo)
;
{ OtherErrors = [FirstOtherError | _] }
->
report_mode_error_conj_2([FirstOtherError], VarSet, Context,
ModeInfo)
;
% There wasn't any error to report! This can't happen.
{ error("report_mode_error_conj") }
).
:- pred find_important_errors(list(delayed_goal), list(delayed_goal),
list(delayed_goal)).
:- mode find_important_errors(in, out, out) is det.
find_important_errors([], [], []).
find_important_errors([Error | Errors], ImportantErrors, OtherErrors) :-
Error = delayed_goal(_, mode_error_info(_, _, _, ModeContext), _),
(
% an error is important unless it is a non-explicit unification,
% i.e. a head unification or a call argument unification
ModeContext = unify(unify_context(UnifyContext, _), _),
UnifyContext \= explicit
->
ImportantErrors1 = ImportantErrors,
OtherErrors = [Error | OtherErrors1]
;
ImportantErrors = [Error | ImportantErrors1],
OtherErrors1 = OtherErrors
),
find_important_errors(Errors, ImportantErrors1, OtherErrors1).
:- pred report_mode_error_conj_2(list(delayed_goal), varset, term__context,
mode_info, io__state, io__state).
:- mode report_mode_error_conj_2(in, in, in, mode_info_no_io, di, uo) is det.
report_mode_error_conj_2([], _, _, _) --> [].
report_mode_error_conj_2([delayed_goal(Vars, Error, Goal) | Rest],
VarSet, Context, ModeInfo) -->
globals__io_lookup_bool_option(debug_modes, Debug),
( { Debug = yes } ->
prog_out__write_context(Context),
io__write_string("Floundered goal, waiting on { "),
{ set__to_sorted_list(Vars, VarList) },
mercury_output_vars(VarList, VarSet),
io__write_string(" } :\n")
;
[]
),
globals__io_lookup_bool_option(very_verbose, VeryVerbose),
( { VeryVerbose = yes } ->
io__write_string("\t\t"),
{ mode_info_get_module_info(ModeInfo, ModuleInfo) },
hlds_out__write_goal(Goal, ModuleInfo, VarSet, 2),
io__write_string(".\n")
;
[]
),
{ Error = mode_error_info(_, ModeError, ErrorContext, ModeContext) },
{ mode_info_set_context(ErrorContext, ModeInfo, ModeInfo1) },
{ mode_info_set_mode_context(ModeContext, ModeInfo1, ModeInfo2) },
report_mode_error(ModeError, ModeInfo2),
report_mode_error_conj_2(Rest, VarSet, Context, ModeInfo2).
%-----------------------------------------------------------------------------%
:- pred report_mode_error_disj(mode_info, merge_context, merge_errors,
io__state, io__state).
:- mode report_mode_error_disj(mode_info_no_io, in, in, di, uo) is det.
report_mode_error_disj(ModeInfo, MergeContext, ErrorList) -->
{ mode_info_get_context(ModeInfo, Context) },
mode_info_write_context(ModeInfo),
prog_out__write_context(Context),
io__write_string(" mode mismatch in "),
write_merge_context(MergeContext),
io__write_string(".\n"),
write_merge_error_list(ErrorList, ModeInfo).
:- pred write_merge_error_list(merge_errors, mode_info, io__state, io__state).
:- mode write_merge_error_list(in, mode_info_no_io, di, uo) is det.
write_merge_error_list([], _) --> [].
write_merge_error_list([Var - Insts | Errors], ModeInfo) -->
{ mode_info_get_context(ModeInfo, Context) },
{ mode_info_get_varset(ModeInfo, VarSet) },
{ mode_info_get_instvarset(ModeInfo, InstVarSet) },
prog_out__write_context(Context),
io__write_string(" `"),
mercury_output_var(Var, VarSet),
io__write_string("' :: "),
mercury_output_inst_list(Insts, InstVarSet),
io__write_string(".\n"),
write_merge_error_list(Errors, ModeInfo).
:- pred write_merge_context(merge_context, io__state, io__state).
:- mode write_merge_context(in, di, uo) is det.
write_merge_context(disj) -->
io__write_string("disjunction").
write_merge_context(if_then_else) -->
io__write_string("if-then-else").
%-----------------------------------------------------------------------------%
:- pred report_mode_error_bind_var(mode_info, var, inst, inst,
io__state, io__state).
:- mode report_mode_error_bind_var(mode_info_ui, in, in, in, di, uo) is det.
report_mode_error_bind_var(ModeInfo, Var, VarInst, Inst) -->
{ mode_info_get_context(ModeInfo, Context) },
{ mode_info_get_varset(ModeInfo, VarSet) },
{ mode_info_get_instvarset(ModeInfo, InstVarSet) },
mode_info_write_context(ModeInfo),
prog_out__write_context(Context),
io__write_string(
" scope error: attempt to bind variable inside a negation.\n"),
prog_out__write_context(Context),
io__write_string(" Variable `"),
mercury_output_var(Var, VarSet),
io__write_string("' has instantiatedness `"),
mercury_output_inst(VarInst, InstVarSet),
io__write_string("',\n"),
prog_out__write_context(Context),
io__write_string(" expected instantiatedness was `"),
mercury_output_inst(Inst, InstVarSet),
io__write_string("'.\n"),
globals__io_lookup_bool_option(verbose_errors, VerboseErrors),
( { VerboseErrors = yes } ->
io__write_string("\tA negation is only allowed to bind variables which are local to the\n"),
io__write_string("\tnegation, i.e. those which are implicitly existentially quantified\n"),
io__write_string("\tinside the scope of the negation.\n"),
io__write_string("\tNote that the condition of an if-then-else is implicitly\n"),
io__write_string("\tnegated in the ""else"" part, so the condition can only bind\n"),
io__write_string("\tvariables in the ""then"" part.\n")
;
[]
).
%-----------------------------------------------------------------------------%
:- pred report_mode_error_no_matching_mode(mode_info, list(var), list(inst),
io__state, io__state).
:- mode report_mode_error_no_matching_mode(mode_info_ui, in, in, di, uo) is det.
report_mode_error_no_matching_mode(ModeInfo, Vars, Insts) -->
{ 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) },
mode_info_write_context(ModeInfo),
prog_out__write_context(Context),
io__write_string(" mode error: arguments `"),
mercury_output_vars(Vars, VarSet),
io__write_string("'\n"),
prog_out__write_context(Context),
io__write_string(" have insts `"),
mercury_output_inst_list(Insts, InstVarSet),
io__write_string("',\n"),
prog_out__write_context(Context),
io__write_string(" which does not match any of the modes for "),
{ mode_info_get_mode_context(ModeInfo, ModeContext) },
( { ModeContext = call(PredId, _) } ->
hlds_out__write_pred_id(ModuleInfo, PredId)
;
{ error("report_mode_error_no_matching_mode: invalid context") }
),
io__write_string(".\n").
:- pred report_mode_error_higher_order_pred_var(mode_info, pred_or_func, var,
inst, arity,
io__state, io__state).
:- mode report_mode_error_higher_order_pred_var(mode_info_ui, in, in, in, in,
di, uo) is det.
report_mode_error_higher_order_pred_var(ModeInfo, PredOrFunc, Var, VarInst,
Arity) -->
{ mode_info_get_context(ModeInfo, Context) },
{ mode_info_get_varset(ModeInfo, VarSet) },
{ mode_info_get_instvarset(ModeInfo, InstVarSet) },
mode_info_write_context(ModeInfo),
prog_out__write_context(Context),
io__write_string(" mode error: variable `"),
mercury_output_var(Var, VarSet),
io__write_string("' has instantiatedness `"),
mercury_output_inst(VarInst, InstVarSet),
io__write_string("',\n"),
prog_out__write_context(Context),
( { PredOrFunc = predicate },
io__write_string(" expecting higher-order pred inst (of arity "),
io__write_int(Arity)
; { PredOrFunc = function },
io__write_string(" expecting higher-order func inst (of arity "),
{ Arity1 is Arity - 1 },
io__write_int(Arity1)
),
io__write_string(").\n").
:- pred report_mode_error_var_is_live(mode_info, var, io__state, io__state).
:- mode report_mode_error_var_is_live(mode_info_ui, in, di, uo) is det.
report_mode_error_var_is_live(ModeInfo, Var) -->
{ mode_info_get_context(ModeInfo, Context) },
{ mode_info_get_varset(ModeInfo, VarSet) },
mode_info_write_context(ModeInfo),
prog_out__write_context(Context),
io__write_string(" unique-mode error: the called procedure would clobber\n"),
prog_out__write_context(Context),
io__write_string(" its argument, but variable `"),
mercury_output_var(Var, VarSet),
io__write_string("' is still live.\n").
:- pred report_mode_error_var_has_inst(mode_info, var, inst, inst,
io__state, io__state).
:- mode report_mode_error_var_has_inst(mode_info_ui, in, in, in, di, uo) is det.
report_mode_error_var_has_inst(ModeInfo, Var, VarInst, Inst) -->
{ mode_info_get_context(ModeInfo, Context) },
{ mode_info_get_varset(ModeInfo, VarSet) },
{ mode_info_get_instvarset(ModeInfo, InstVarSet) },
mode_info_write_context(ModeInfo),
prog_out__write_context(Context),
io__write_string(" mode error: variable `"),
mercury_output_var(Var, VarSet),
io__write_string("' has instantiatedness `"),
mercury_output_inst(VarInst, InstVarSet),
io__write_string("',\n"),
prog_out__write_context(Context),
io__write_string(" expected instantiatedness was `"),
mercury_output_inst(Inst, InstVarSet),
io__write_string("'.\n").
:- pred report_mode_error_implied_mode(mode_info, var, inst, inst,
io__state, io__state).
:- mode report_mode_error_implied_mode(mode_info_ui, in, in, in, di, uo) is det.
report_mode_error_implied_mode(ModeInfo, Var, VarInst, Inst) -->
% This "error" message is really a "sorry, not implemented"
% message. We only print the message if we are actually
% going to generating code.
globals__io_lookup_bool_option(errorcheck_only, ErrorcheckOnly),
( { ErrorcheckOnly = no } ->
{ mode_info_get_context(ModeInfo, Context) },
{ mode_info_get_varset(ModeInfo, VarSet) },
{ mode_info_get_instvarset(ModeInfo, InstVarSet) },
mode_info_write_context(ModeInfo),
prog_out__write_context(Context),
io__write_string(" sorry, implied modes not implemented.\n"),
prog_out__write_context(Context),
io__write_string(" Variable `"),
mercury_output_var(Var, VarSet),
io__write_string("' has instantiatedness `"),
mercury_output_inst(VarInst, InstVarSet),
io__write_string("',\n"),
prog_out__write_context(Context),
io__write_string(" expected instantiatedness was `"),
mercury_output_inst(Inst, InstVarSet),
io__write_string("'.\n")
;
[]
).
:- pred report_mode_error_no_mode_decl(mode_info, io__state, io__state).
:- mode report_mode_error_no_mode_decl(mode_info_ui, di, uo) is det.
report_mode_error_no_mode_decl(ModeInfo) -->
{ mode_info_get_context(ModeInfo, Context) },
mode_info_write_context(ModeInfo),
prog_out__write_context(Context),
io__write_string(" no mode declaration for called predicate.\n").
:- pred report_mode_error_unify_pred(mode_info, var, mode_error_unify_rhs,
type, pred_or_func,
io__state, io__state).
:- mode report_mode_error_unify_pred(mode_info_ui, in, in, in, in,
di, uo) is det.
report_mode_error_unify_pred(ModeInfo, X, RHS, Type, PredOrFunc) -->
{ mode_info_get_context(ModeInfo, Context) },
{ mode_info_get_varset(ModeInfo, VarSet) },
mode_info_write_context(ModeInfo),
prog_out__write_context(Context),
io__write_string(" In unification of `"),
mercury_output_var(X, VarSet),
io__write_string("' with `"),
(
{ RHS = error_at_var(Y) },
mercury_output_var(Y, VarSet)
;
{ RHS = error_at_functor(Const, ArgVars) },
hlds_out__write_functor(Const, ArgVars, VarSet)
;
{ RHS = error_at_lambda(ArgVars, ArgModes) },
io__write_string("lambda(["),
hlds_out__write_var_modes(ArgVars, ArgModes, VarSet),
io__write_string("] ... )")
),
io__write_string("':\n"),
prog_out__write_context(Context),
io__write_string(" mode error: attempt at higher-order unification.\n"),
prog_out__write_context(Context),
io__write_string(" Cannot unify two terms of type `"),
{ varset__init(TypeVarSet) },
mercury_output_term(Type, TypeVarSet),
io__write_string("'.\n"),
globals__io_lookup_bool_option(verbose_errors, VerboseErrors),
( { VerboseErrors = yes } ->
io__write_string("\tYour code is trying to test whether two "),
hlds_out__write_pred_or_func(PredOrFunc),
io__write_string("s are equal,\n"),
io__write_string("\tby unifying them. In the general case, testing equivalence\n"),
io__write_string("\tof "),
hlds_out__write_pred_or_func(PredOrFunc),
io__write_string("s is an undecidable problem,\n"),
io__write_string("\tand so this is not allowed by the Mercury mode system.\n"),
io__write_string("\tIn some cases, you can achieve the same effect by\n"),
io__write_string("\twriting an explicit universal quantification,\n"),
io__write_string("\te.g. `all [X] call(P, X) <=> call(Q, X)',"),
io__write_string(" instead of `P = Q'.\n")
;
[]
).
%-----------------------------------------------------------------------------%
:- pred report_mode_error_unify_var_var(mode_info, var, var, inst, inst,
io__state, io__state).
:- mode report_mode_error_unify_var_var(mode_info_ui, in, in, in, in, di, uo)
is det.
report_mode_error_unify_var_var(ModeInfo, X, Y, InstX, InstY) -->
{ mode_info_get_context(ModeInfo, Context) },
{ mode_info_get_varset(ModeInfo, VarSet) },
{ mode_info_get_instvarset(ModeInfo, InstVarSet) },
mode_info_write_context(ModeInfo),
prog_out__write_context(Context),
io__write_string(" mode error in unification of `"),
mercury_output_var(X, VarSet),
io__write_string("' and `"),
mercury_output_var(Y, VarSet),
io__write_string("'.\n"),
prog_out__write_context(Context),
io__write_string(" Variable `"),
mercury_output_var(X, VarSet),
io__write_string("' has instantiatedness `"),
mercury_output_inst(InstX, InstVarSet),
io__write_string("',\n"),
prog_out__write_context(Context),
io__write_string(" variable `"),
mercury_output_var(Y, VarSet),
io__write_string("' has instantiatedness `"),
mercury_output_inst(InstY, InstVarSet),
io__write_string("'.\n").
%-----------------------------------------------------------------------------%
:- pred report_mode_error_unify_var_lambda(mode_info, var, inst, inst,
io__state, io__state).
:- mode report_mode_error_unify_var_lambda(mode_info_ui, in, in, in, di, uo)
is det.
report_mode_error_unify_var_lambda(ModeInfo, X, InstX, InstY) -->
{ mode_info_get_context(ModeInfo, Context) },
{ mode_info_get_varset(ModeInfo, VarSet) },
{ mode_info_get_instvarset(ModeInfo, InstVarSet) },
mode_info_write_context(ModeInfo),
prog_out__write_context(Context),
io__write_string(" mode error in unification of `"),
mercury_output_var(X, VarSet),
io__write_string("' and lambda expression.\n"),
prog_out__write_context(Context),
io__write_string(" Variable `"),
mercury_output_var(X, VarSet),
io__write_string("' has instantiatedness `"),
mercury_output_inst(InstX, InstVarSet),
io__write_string("',\n"),
prog_out__write_context(Context),
io__write_string(" lambda expression has instantiatedness `"),
mercury_output_inst(InstY, InstVarSet),
io__write_string("'.\n").
%-----------------------------------------------------------------------------%
:- pred report_mode_error_unify_var_functor(mode_info, var, const, list(var),
inst, list(inst), io__state, io__state).
:- mode report_mode_error_unify_var_functor(mode_info_ui, in, in, in, in, in,
di, uo) is det.
report_mode_error_unify_var_functor(ModeInfo, X, Name, Args, InstX, ArgInsts)
-->
{ mode_info_get_context(ModeInfo, Context) },
{ mode_info_get_varset(ModeInfo, VarSet) },
{ mode_info_get_instvarset(ModeInfo, InstVarSet) },
mode_info_write_context(ModeInfo),
prog_out__write_context(Context),
io__write_string(" mode error in unification of `"),
mercury_output_var(X, VarSet),
io__write_string("' and `"),
hlds_out__write_functor(Name, Args, VarSet),
io__write_string("'.\n"),
prog_out__write_context(Context),
io__write_string(" Variable `"),
mercury_output_var(X, VarSet),
io__write_string("' has instantiatedness `"),
mercury_output_inst(InstX, InstVarSet),
io__write_string("',\n"),
prog_out__write_context(Context),
io__write_string(" term `"),
hlds_out__write_functor(Name, Args, VarSet),
( { Args \= [] } ->
io__write_string("'\n"),
prog_out__write_context(Context),
io__write_string(" has instantiatedness `"),
term_io__write_constant(Name),
io__write_string("("),
mercury_output_inst_list(ArgInsts, InstVarSet),
io__write_string(")")
;
io__write_string("' has instantiatedness `"),
term_io__write_constant(Name)
),
io__write_string("'.\n").
%-----------------------------------------------------------------------------%
:- pred mode_info_write_context(mode_info, io__state, io__state).
:- mode mode_info_write_context(mode_info_no_io, di, uo) is det.
mode_info_write_context(ModeInfo) -->
{ 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_preds(ModuleInfo, Preds) },
{ map__lookup(Preds, PredId, PredInfo) },
{ pred_info_procedures(PredInfo, Procs) },
{ map__lookup(Procs, ProcId, ProcInfo) },
{ proc_info_argmodes(ProcInfo, ArgModes) },
{ pred_info_name(PredInfo, PredName) },
{ mode_info_get_instvarset(ModeInfo, InstVarSet) },
prog_out__write_context(Context),
io__write_string("In clause for `"),
io__write_string(PredName),
( { ArgModes \= [] } ->
io__write_string("("),
mercury_output_mode_list(ArgModes, InstVarSet),
io__write_string(")")
;
[]
),
io__write_string("':\n"),
{ mode_info_get_mode_context(ModeInfo, ModeContext) },
write_mode_context(ModeContext, Context, ModuleInfo).
%-----------------------------------------------------------------------------%
:- pred report_mode_error_final_inst(mode_info, int, var, inst, inst,
final_inst_error, io__state, io__state).
:- mode report_mode_error_final_inst(mode_info_ui, in, in, in, in, in,
di, uo) is det.
report_mode_error_final_inst(ModeInfo, ArgNum, Var, VarInst, Inst, Reason) -->
{ mode_info_get_context(ModeInfo, Context) },
{ mode_info_get_varset(ModeInfo, VarSet) },
{ mode_info_get_instvarset(ModeInfo, InstVarSet) },
mode_info_write_context(ModeInfo),
prog_out__write_context(Context),
io__write_string(" mode error: argument "),
io__write_int(ArgNum),
( { Reason = too_instantiated } ->
io__write_string(" became too instantiated")
; { Reason = not_instantiated_enough } ->
io__write_string(" did not get sufficiently instantiated")
;
% I don't think this can happen. But just in case...
io__write_string(" had the wrong instantiatedness")
),
io__write_string(".\n"),
prog_out__write_context(Context),
io__write_string(" Final instantiatedness of `"),
mercury_output_var(Var, VarSet),
io__write_string("' was `"),
mercury_output_inst(VarInst, InstVarSet),
io__write_string("',\n"),
prog_out__write_context(Context),
io__write_string(" expected final instantiatedness was `"),
mercury_output_inst(Inst, InstVarSet),
io__write_string("'.\n").
%-----------------------------------------------------------------------------%
%-----------------------------------------------------------------------------%
mode_context_init(uninitialized).
%-----------------------------------------------------------------------------%
% XXX some parts of the mode context never get set up
:- pred write_mode_context(mode_context, term__context, module_info,
io__state, io__state).
:- mode write_mode_context(in, in, in, di, uo) is det.
write_mode_context(uninitialized, _Context, _ModuleInfo) -->
[].
write_mode_context(higher_order_call(PredOrFunc, ArgNum), Context, _ModuleInfo)
-->
prog_out__write_context(Context),
io__write_string(" in "),
( { ArgNum = 0 } ->
io__write_string("higher-order "),
hlds_out__write_pred_or_func(PredOrFunc),
io__write_string(" call:\n")
;
io__write_string("argument "),
io__write_int(ArgNum),
io__write_string(" of higher-order "),
hlds_out__write_pred_or_func(PredOrFunc),
io__write_string(" call\n"),
prog_out__write_context(Context),
io__write_string(" (i.e. in "),
( { ArgNum = 1 } ->
io__write_string("the "),
hlds_out__write_pred_or_func(PredOrFunc),
io__write_string(" term")
;
io__write_string("argument "),
{ ArgNum1 is ArgNum - 1 },
io__write_int(ArgNum1),
io__write_string(" of the called "),
hlds_out__write_pred_or_func(PredOrFunc)
),
io__write_string("):\n")
).
write_mode_context(call(PredId, ArgNum), Context, ModuleInfo) -->
prog_out__write_context(Context),
io__write_string(" in "),
( { ArgNum = 0 } ->
[]
;
io__write_string("argument "),
io__write_int(ArgNum),
io__write_string(" of ")
),
io__write_string("call to "),
hlds_out__write_pred_id(ModuleInfo, PredId),
io__write_string(":\n").
write_mode_context(unify(UnifyContext, _Side), Context, _ModuleInfo) -->
hlds_out__write_unify_context(UnifyContext, Context).
%-----------------------------------------------------------------------------%
maybe_report_error_no_modes(PredId, PredInfo, ModuleInfo) -->
{ pred_info_import_status(PredInfo, ImportStatus) },
( { ImportStatus = local } ->
globals__io_lookup_bool_option(infer_modes, InferModesOpt),
( { InferModesOpt = yes } ->
[]
;
io__set_exit_status(1),
{ pred_info_context(PredInfo, Context) },
prog_out__write_context(Context),
io__write_string("Error: no mode declaration for "),
hlds_out__write_pred_id(ModuleInfo, PredId),
io__write_string(".\n"),
globals__io_lookup_bool_option(verbose_errors,
VerboseErrors),
( { VerboseErrors = yes } ->
prog_out__write_context(Context),
io__write_string(
" (Use `--infer-modes' to enable mode inference.)\n")
;
[]
)
)
;
io__set_exit_status(1),
{ pred_info_context(PredInfo, Context) },
prog_out__write_context(Context),
io__write_string("Error: no mode declaration for exported\n"),
prog_out__write_context(Context),
io__write_string(" "),
hlds_out__write_pred_id(ModuleInfo, PredId),
io__write_string(".\n")
).
%-----------------------------------------------------------------------------%
% write out the inferred `mode' declarations for a list of pred_ids.
write_mode_inference_messages([], _) --> [].
write_mode_inference_messages([PredId | PredIds], ModuleInfo) -->
{ module_info_pred_info(ModuleInfo, PredId, PredInfo) },
{ pred_info_get_marker_list(PredInfo, Markers) },
( { list__member(request(infer_modes), Markers) } ->
{ pred_info_procedures(PredInfo, Procs) },
{ map__keys(Procs, ProcIds) },
write_mode_inference_messages_2(ProcIds, Procs, PredInfo)
;
[]
),
write_mode_inference_messages(PredIds, ModuleInfo).
% write out the inferred `mode' declarations for a list of
% proc_ids
:- pred write_mode_inference_messages_2(list(proc_id), proc_table, pred_info,
io__state, io__state).
:- mode write_mode_inference_messages_2(in, in, in, di, uo) is det.
write_mode_inference_messages_2([], _, _) --> [].
write_mode_inference_messages_2([ProcId | ProcIds], Procs, PredInfo) -->
{ map__lookup(Procs, ProcId, ProcInfo) },
write_mode_inference_message(PredInfo, ProcInfo),
write_mode_inference_messages_2(ProcIds, Procs, PredInfo).
% write out the inferred `mode' declaration
% for a single function or predicate.
:- pred write_mode_inference_message(pred_info, proc_info,
io__state, io__state).
:- mode write_mode_inference_message(in, in, di, uo) is det.
write_mode_inference_message(PredInfo, ProcInfo) -->
{ pred_info_name(PredInfo, PredName) },
{ Name = unqualified(PredName) },
{ pred_info_context(PredInfo, Context) },
{ proc_info_argmodes(ProcInfo, Modes) },
{ varset__init(VarSet) },
{ pred_info_get_is_pred_or_func(PredInfo, PredOrFunc) },
{ MaybeDet = no },
prog_out__write_context(Context),
io__write_string("Inferred "),
( { PredOrFunc = predicate },
mercury_output_pred_mode_decl(VarSet, Name, Modes,
MaybeDet, Context)
; { PredOrFunc = function },
{ pred_args_to_func_args(Modes, ArgModes, RetMode) },
mercury_output_func_mode_decl(VarSet, Name, ArgModes, RetMode,
MaybeDet, Context)
).
%-----------------------------------------------------------------------------%
%-----------------------------------------------------------------------------%
Reference in New Issue View Git Blame Copy Permalink