[m-rev.] deleting the code for undiscriminated unions

Zoltan Somogyi zs at cs.mu.OZ.AU
Mon Feb 25 16:33:20 AEDT 2002


For review by anyone.

compiler/*.m:
	Delete the code "handling" undiscrimited unions. Their presence
	slows things down, the error messages they lead to can confuse
	users, and we are unlikely to ever implement them in the form
	now assumed by the code.

Zoltan.

cvs diff: Diffing .
cvs diff: Diffing bindist
cvs diff: Diffing boehm_gc
cvs diff: Diffing boehm_gc/Mac_files
cvs diff: Diffing boehm_gc/cord
cvs diff: Diffing boehm_gc/cord/private
cvs diff: Diffing boehm_gc/doc
cvs diff: Diffing boehm_gc/include
cvs diff: Diffing boehm_gc/include/private
cvs diff: Diffing boehm_gc/tests
cvs diff: Diffing browser
cvs diff: Diffing bytecode
cvs diff: Diffing compiler
Index: compiler/equiv_type.m
===================================================================
RCS file: /home/mercury1/repository/mercury/compiler/equiv_type.m,v
retrieving revision 1.26
diff -u -b -r1.26 equiv_type.m
--- compiler/equiv_type.m	2001/06/27 05:04:03	1.26
+++ compiler/equiv_type.m	2002/02/23 10:51:31
@@ -252,12 +252,6 @@
 	equiv_type__replace_in_type_2(TBody0, VarSet0, EqvMap, [TypeId],
 		TBody, VarSet, ContainsCirc, Info0, Info).
 
-equiv_type__replace_in_type_defn(_, uu_type(TBody0),
-		VarSet0, EqvMap, uu_type(TBody), VarSet, no,
-		Info0, Info) :-
-	equiv_type__replace_in_uu(TBody0, VarSet0, EqvMap, TBody,
-		VarSet, Info0, Info).
-
 equiv_type__replace_in_type_defn(_, du_type(TBody0,
 		EqPred), VarSet0, EqvMap, du_type(TBody, EqPred),
 		VarSet, no, Info0, Info) :-
Index: compiler/hlds_data.m
===================================================================
RCS file: /home/mercury1/repository/mercury/compiler/hlds_data.m,v
retrieving revision 1.65
diff -u -b -r1.65 hlds_data.m
--- compiler/hlds_data.m	2002/02/22 01:20:41	1.65
+++ compiler/hlds_data.m	2002/02/23 03:58:01
@@ -297,7 +297,6 @@
 			bool,		% is this type an enumeration?
 			maybe(sym_name) % user-defined equality pred
 		)
-	;	uu_type(list(type))	% not yet implemented!
 	;	eqv_type(type)
 	;	foreign_type(
 			bool,		% is the type already boxed
Index: compiler/hlds_out.m
===================================================================
RCS file: /home/mercury1/repository/mercury/compiler/hlds_out.m,v
retrieving revision 1.274
diff -u -b -r1.274 hlds_out.m
--- compiler/hlds_out.m	2002/02/22 01:20:43	1.274
+++ compiler/hlds_out.m	2002/02/23 10:42:34
@@ -2714,9 +2714,6 @@
 	io__write_string(".\n").
 
 	
-hlds_out__write_type_body(_Indent, _Tvarset, uu_type(_)) -->
-	{ error("hlds_out__write_type_body: undiscriminated union found") }.
-
 hlds_out__write_type_body(_Indent, Tvarset, eqv_type(Type)) -->
 	io__write_string(" == "),
 	term_io__write_term(Tvarset, Type),
Index: compiler/intermod.m
===================================================================
RCS file: /home/mercury1/repository/mercury/compiler/intermod.m,v
retrieving revision 1.112
diff -u -b -r1.112 intermod.m
--- compiler/intermod.m	2002/02/22 01:20:47	1.112
+++ compiler/intermod.m	2002/02/23 10:42:39
@@ -1209,9 +1209,6 @@
 		{ Body = du_type(Ctors, _, _, MaybeEqualityPred) },
 		{ TypeBody = du_type(Ctors, MaybeEqualityPred) }
 	;
-		{ Body = uu_type(_) },
-		{ error("uu types not implemented") }
-	;
 		{ Body = eqv_type(EqvType) },
 		{ TypeBody = eqv_type(EqvType) }
 	;
Index: compiler/magic_util.m
===================================================================
RCS file: /home/mercury1/repository/mercury/compiler/magic_util.m,v
retrieving revision 1.17
diff -u -b -r1.17 magic_util.m
--- compiler/magic_util.m	2002/02/20 03:14:10	1.17
+++ compiler/magic_util.m	2002/02/23 10:42:45
@@ -1373,8 +1373,6 @@
 magic_util__check_type_defn(du_type(Ctors, _, _, _),
 		Parents, Errors0, Errors) -->
 	list__foldl2(magic_util__check_ctor(Parents), Ctors, Errors0, Errors).
-magic_util__check_type_defn(uu_type(_), _, _, _) -->
-	{ error("magic_util__check_type_defn: uu_type") }.
 magic_util__check_type_defn(eqv_type(_), _, _, _) -->
 	{ error("magic_util__check_type_defn: eqv_type") }.
 magic_util__check_type_defn(abstract_type, _, Errors0, Errors) -->
Index: compiler/make_hlds.m
===================================================================
RCS file: /home/mercury1/repository/mercury/compiler/make_hlds.m,v
retrieving revision 1.400
diff -u -b -r1.400 make_hlds.m
--- compiler/make_hlds.m	2002/02/22 01:20:49	1.400
+++ compiler/make_hlds.m	2002/02/23 10:46:42
@@ -1965,17 +1965,7 @@
 		{ add_special_preds(Module2, TVarSet, Type, TypeId,
 			Body, Context, Status, Module3) },
 		{ module_info_set_types(Module3, Types, Module) },
-		( { Body = uu_type(_) } ->
-			io__stderr_stream(StdErr),
-			io__set_output_stream(StdErr, OldStream),
-			prog_out__write_context(Context),
-			io__write_string("Error in type declaration: \n"),
-			prog_out__write_context(Context),
-			io__write_string(
-	"  the syntax for type equivalence is `:- type t1 == t2'.\n"),
-			io__set_exit_status(1),
-			io__set_output_stream(OldStream, _)
-		;
+		(
 			% XXX we can't handle abstract exported
 			% polymorphic equivalence types with monomorphic
 			% bodies, because the compiler stuffs up the
@@ -2097,7 +2087,6 @@
 convert_type_defn(du_type(Body, EqualityPred), TypeId, Globals,
 		du_type(Body, CtorTags, IsEnum, EqualityPred)) :-
 	assign_constructor_tags(Body, TypeId, Globals, CtorTags, IsEnum).
-convert_type_defn(uu_type(Body), _, _, uu_type(Body)).
 convert_type_defn(eqv_type(Body), _, _, eqv_type(Body)).
 convert_type_defn(abstract_type, _, _, abstract_type).
 
Index: compiler/mercury_to_mercury.m
===================================================================
RCS file: /home/mercury1/repository/mercury/compiler/mercury_to_mercury.m,v
retrieving revision 1.205
diff -u -b -r1.205 mercury_to_mercury.m
--- compiler/mercury_to_mercury.m	2002/02/20 03:14:10	1.205
+++ compiler/mercury_to_mercury.m	2002/02/23 11:02:00
@@ -1553,13 +1553,6 @@
 		type_defn, prog_context, io__state, io__state).
 :- mode mercury_output_type_defn(in, in, in, in, in, di, uo) is det.
 
-mercury_output_type_defn(_VarSet, _Name, _Args, uu_type(_Body), Context) -->
-	io__stderr_stream(StdErr),
-	io__set_output_stream(StdErr, OldStream),
-	prog_out__write_context(Context),
-	io__write_string("warning: undiscriminated union types not yet supported.\n"),
-	io__set_output_stream(OldStream, _).
-
 mercury_output_type_defn(VarSet, Name, Args, abstract_type, Context) -->
 	io__write_string(":- type "),
 	{ construct_qualified_term(Name, Args, Context, TypeTerm) },
Index: compiler/ml_type_gen.m
===================================================================
RCS file: /home/mercury1/repository/mercury/compiler/ml_type_gen.m,v
retrieving revision 1.23
diff -u -b -r1.23 ml_type_gen.m
--- compiler/ml_type_gen.m	2002/02/18 05:21:49	1.23
+++ compiler/ml_type_gen.m	2002/02/23 10:43:23
@@ -113,8 +113,6 @@
 ml_gen_type_2(eqv_type(_EqvType), _, _, _) --> []. % XXX Fixme!
 	% For a description of the problems with equivalence types,
 	% see our BABEL'01 paper "Compiling Mercury to the .NET CLR".
-ml_gen_type_2(uu_type(_), _, _, _) -->
-	{ error("sorry, undiscriminated union types not implemented") }.
 ml_gen_type_2(du_type(Ctors, TagValues, IsEnum, MaybeEqualityPred),
 		ModuleInfo, TypeId, TypeDefn) -->
 	{ ml_gen_equality_members(MaybeEqualityPred, MaybeEqualityMembers) },
Index: compiler/module_qual.m
===================================================================
RCS file: /home/mercury1/repository/mercury/compiler/module_qual.m,v
retrieving revision 1.72
diff -u -b -r1.72 module_qual.m
--- compiler/module_qual.m	2002/02/08 02:26:52	1.72
+++ compiler/module_qual.m	2002/02/23 11:02:05
@@ -649,8 +649,6 @@
 	% (during mode analysis).  That way they get full type overloading
 	% resolution, etc.  Thus we don't module-qualify them here.
 	{ MaybeEqualityPred = MaybeEqualityPred0 }.
-qualify_type_defn(uu_type(Types0), uu_type(Types), Info0, Info) -->
-	qualify_type_list(Types0, Types, Info0, Info).	
 qualify_type_defn(eqv_type(Type0), eqv_type(Type), Info0, Info) -->
 	qualify_type(Type0, Type, Info0, Info).	
 qualify_type_defn(abstract_type, abstract_type, Info, Info) --> [].
Index: compiler/prog_data.m
===================================================================
RCS file: /home/mercury1/repository/mercury/compiler/prog_data.m,v
retrieving revision 1.78
diff -u -b -r1.78 prog_data.m
--- compiler/prog_data.m	2002/02/20 03:14:17	1.78
+++ compiler/prog_data.m	2002/02/23 10:46:38
@@ -742,7 +742,6 @@
 
 :- type type_defn	
 	--->	du_type(list(constructor), maybe(equality_pred))
-	;	uu_type(list(type))
 	;	eqv_type(type)
 	;	abstract_type.
 
Index: compiler/prog_io.m
===================================================================
RCS file: /home/mercury1/repository/mercury/compiler/prog_io.m,v
retrieving revision 1.200
diff -u -b -r1.200 prog_io.m
--- compiler/prog_io.m	2002/02/12 04:59:01	1.200
+++ compiler/prog_io.m	2002/02/23 11:02:45
@@ -1341,10 +1341,6 @@
 	get_maybe_equality_pred(B, Body, EqualityPred),
 	process_du_type(ModuleName, H, Body, EqualityPred, R).
 
-parse_type_decl_type(ModuleName, "=", [H, B], Condition, R) :-
-	get_condition(B, Body, Condition),
-	process_uu_type(ModuleName, H, Body, R).
-
 parse_type_decl_type(ModuleName, "==", [H, B], Condition, R) :-
 	get_condition(B, Body, Condition),
 	process_eqv_type(ModuleName, H, Body, R).
@@ -1517,22 +1513,6 @@
 		list(type_param),
 		type_defn
 	).
-
-	% This is for "Head = Body" (undiscriminated union) definitions.
-:- pred process_uu_type(module_name, term, term, maybe1(processed_type_body)).
-:- mode process_uu_type(in, in, in, out) is det.
-process_uu_type(ModuleName, Head, Body, Result) :-
-	check_for_errors(ModuleName, Head, Body, Result0),
-	process_uu_type_2(Result0, Body, Result).
-
-:- pred process_uu_type_2(maybe_functor, term, maybe1(processed_type_body)).
-:- mode process_uu_type_2(in, in, out) is det.
-process_uu_type_2(error(Error, Term), _, error(Error, Term)).
-process_uu_type_2(ok(Name, Args0), Body,
-		ok(processed_type_body(Name, Args, uu_type(List)))) :-
-	list__map(term__coerce, Args0, Args),
-	sum_to_list(Body, List0),
-	list__map(convert_type, List0, List).
 
 %-----------------------------------------------------------------------------%
 
Index: compiler/recompilation_check.m
===================================================================
RCS file: /home/mercury1/repository/mercury/compiler/recompilation_check.m,v
retrieving revision 1.8
diff -u -b -r1.8 recompilation_check.m
--- compiler/recompilation_check.m	2002/02/23 07:30:48	1.8
+++ compiler/recompilation_check.m	2002/02/25 03:10:19
@@ -1096,7 +1096,6 @@
 
 check_type_defn_ambiguity_with_functor(_, _, abstract_type) --> [].
 check_type_defn_ambiguity_with_functor(_, _, eqv_type(_)) --> [].
-check_type_defn_ambiguity_with_functor(_, _, uu_type(_)) --> [].
 check_type_defn_ambiguity_with_functor(NeedQualifier,
 			TypeId, du_type(Ctors, _)) -->
 	list__foldl(check_functor_ambiguities(NeedQualifier, TypeId),
Index: compiler/recompilation_usage.m
===================================================================
RCS file: /home/mercury1/repository/mercury/compiler/recompilation_usage.m,v
retrieving revision 1.4
diff -u -b -r1.4 recompilation_usage.m
--- compiler/recompilation_usage.m	2002/01/16 01:13:41	1.4
+++ compiler/recompilation_usage.m	2002/02/23 10:43:30
@@ -1023,8 +1023,6 @@
 	    ), Ctors).
 recompilation_usage__find_items_used_by_type_body(eqv_type(Type)) -->
 	recompilation_usage__find_items_used_by_type(Type).
-recompilation_usage__find_items_used_by_type_body(uu_type(Types)) -->
-	recompilation_usage__find_items_used_by_types(Types).
 recompilation_usage__find_items_used_by_type_body(abstract_type) --> [].
 recompilation_usage__find_items_used_by_type_body(foreign_type(_, _, _)) --> [].
 
Index: compiler/recompilation_version.m
===================================================================
RCS file: /home/mercury1/repository/mercury/compiler/recompilation_version.m,v
retrieving revision 1.12
diff -u -b -r1.12 recompilation_version.m
--- compiler/recompilation_version.m	2002/02/08 02:26:58	1.12
+++ compiler/recompilation_version.m	2002/02/23 11:03:00
@@ -247,10 +247,6 @@
 			% always use the body.
 			{ NameItem = Item },
 			{ BodyItem = Item }
-		;
-			{ Body = uu_type(_) },
-			{ error(
-			"recompilation_version__gather_items_2: uu_type") }
 		),
 		{ TypeId = Name - list__length(Args) },
 		GatheredItems0 =^ gathered_items,
Index: compiler/special_pred.m
===================================================================
RCS file: /home/mercury1/repository/mercury/compiler/special_pred.m,v
retrieving revision 1.26
diff -u -b -r1.26 special_pred.m
--- compiler/special_pred.m	2000/10/13 13:55:57	1.26
+++ compiler/special_pred.m	2002/02/23 10:43:37
@@ -199,7 +199,6 @@
 
 can_generate_special_pred_clauses_for_type(TypeId, Body) :-
 	Body \= abstract_type,
-	Body \= uu_type(_),
 	\+ type_id_has_hand_defined_rtti(TypeId).
 
 %-----------------------------------------------------------------------------%
Index: compiler/term_util.m
===================================================================
RCS file: /home/mercury1/repository/mercury/compiler/term_util.m,v
retrieving revision 1.16
diff -u -b -r1.16 term_util.m
--- compiler/term_util.m	2002/01/16 01:13:41	1.16
+++ compiler/term_util.m	2002/02/23 10:43:42
@@ -257,9 +257,6 @@
 		find_weights_for_cons_list(Constructors, TypeId, TypeParams,
 			Weights0, Weights)
 	;
-		TypeBody = uu_type(_),
-		error("undiscriminated union types not yet implemented")
-	;
 		% This type does not introduce any functors
 		TypeBody = eqv_type(_),
 		Weights = Weights0
Index: compiler/type_ctor_info.m
===================================================================
RCS file: /home/mercury1/repository/mercury/compiler/type_ctor_info.m,v
retrieving revision 1.20
diff -u -b -r1.20 type_ctor_info.m
--- compiler/type_ctor_info.m	2002/01/25 08:22:53	1.20
+++ compiler/type_ctor_info.m	2002/02/23 10:43:49
@@ -244,9 +244,6 @@
 	module_info_globals(ModuleInfo, Globals),
 	hlds_data__get_type_defn_body(HldsDefn, TypeBody),
 	(
-		TypeBody = uu_type(_Alts),
-		sorry(this_file, "undiscriminated union")
-	;
 		TypeBody = abstract_type,
 		TypeCtorRep = unknown,
 		NumFunctors = -1,
Index: compiler/unify_proc.m
===================================================================
RCS file: /home/mercury1/repository/mercury/compiler/unify_proc.m,v
retrieving revision 1.103
diff -u -b -r1.103 unify_proc.m
--- compiler/unify_proc.m	2002/02/12 11:47:19	1.103
+++ compiler/unify_proc.m	2002/02/23 10:44:01
@@ -761,9 +761,6 @@
 		unify_proc__quantify_clauses_body([H1, H2], Goal, Context,
 			Clauses)
 	;
-		{ TypeBody = uu_type(_) },
-		{ error("trying to create unify proc for uu type") }
-	;
 		{ TypeBody = abstract_type },
 		{ error("trying to create unify proc for abstract type") }
 	).
@@ -817,9 +814,6 @@
 		{ TypeBody = foreign_type(_, _, _) },
 		{ error("trying to create index proc for a foreign type") }
 	;
-		{ TypeBody = uu_type(_) },
-		{ error("trying to create index proc for uu type") }
-	;
 		{ TypeBody = abstract_type },
 		{ error("trying to create index proc for abstract type") }
 	).
@@ -899,9 +893,6 @@
 				[Res, H1, H2], Context, Goal),
 		unify_proc__quantify_clauses_body([Res, H1, H2], Goal, Context,
 			Clauses)
-	;
-		{ TypeBody = uu_type(_) },
-		{ error("trying to create compare proc for uu type") }
 	;
 		{ TypeBody = abstract_type },
 		{ error("trying to create compare proc for abstract type") }
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