Test suites for Dialyzer

This is a transcription of most of the cvs.srv.it.uu.se:/hipe repository
dialyzer_tests into test suites that use the test server framework.

See README for information on how to use the included scripts for
modifications and updates.

When testing Dialyzer it's important that several OTP modules
are included in the plt. The suites takes care of that too.

1 files changed, 509 insertions, 0 deletions

diff --git a/lib/dialyzer/test/options1_tests_SUITE_data/src/compiler/core_lib.erl b/lib/dialyzer/test/options1_tests_SUITE_data/src/compiler/core_lib.erl
new file mode 100644
index 0000000000..3a6158286f
--- /dev/null
+++ b/lib/dialyzer/test/options1_tests_SUITE_data/src/compiler/core_lib.erl
@@ -0,0 +1,509 @@
+%% ``The contents of this file are subject to the Erlang Public License,
+%% Version 1.1, (the "License"); you may not use this file except in
+%% compliance with the License. You should have received a copy of the
+%% Erlang Public License along with this software. If not, it can be
+%% retrieved via the world wide web at http://www.erlang.org/.
+%% 
+%% Software distributed under the License is distributed on an "AS IS"
+%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+%% the License for the specific language governing rights and limitations
+%% under the License.
+%% 
+%% The Initial Developer of the Original Code is Ericsson Utvecklings AB.
+%% Portions created by Ericsson are Copyright 1999, Ericsson Utvecklings
+%% AB. All Rights Reserved.''
+%% 
+%%     $Id: core_lib.erl,v 1.1 2008/12/17 09:53:42 mikpe Exp $
+%%
+%% Purpose: Core Erlang abstract syntax functions.
+
+-module(core_lib).
+
+-export([get_anno/1,set_anno/2]).
+-export([is_atomic/1,is_literal/1,is_literal_list/1,
+	 is_simple/1,is_simple_list/1,is_simple_top/1]).
+-export([literal_value/1,make_literal/1]).
+-export([make_values/1]).
+-export([map/2, fold/3, mapfold/3]).
+-export([is_var_used/2]).
+
+%% -compile([export_all]).
+
+-include("core_parse.hrl").
+
+%% get_anno(Core) -> Anno.
+%% set_anno(Core, Anno) -> Core.
+%%  Generic get/set annotation.
+
+get_anno(C) -> element(2, C).
+set_anno(C, A) -> setelement(2, C, A).
+
+%% is_atomic(Expr) -> true | false.
+
+is_atomic(#c_char{}) -> true;
+is_atomic(#c_int{}) -> true;
+is_atomic(#c_float{}) -> true;
+is_atomic(#c_atom{}) -> true;
+is_atomic(#c_string{}) -> true;
+is_atomic(#c_nil{}) -> true;
+is_atomic(#c_fname{}) -> true;
+is_atomic(_) -> false.
+
+%% is_literal(Expr) -> true | false.
+
+is_literal(#c_cons{hd=H,tl=T}) ->
+    case is_literal(H) of
+	true -> is_literal(T); 
+	false -> false
+    end;
+is_literal(#c_tuple{es=Es}) -> is_literal_list(Es);
+is_literal(#c_binary{segments=Es}) -> is_lit_bin(Es);
+is_literal(E) -> is_atomic(E).
+
+is_literal_list(Es) -> lists:all(fun is_literal/1, Es).
+
+is_lit_bin(Es) ->
+    lists:all(fun (#c_bitstr{val=E,size=S}) ->
+		      is_literal(E) and is_literal(S)
+	      end, Es).
+
+%% is_simple(Expr) -> true | false.
+
+is_simple(#c_var{}) -> true;
+is_simple(#c_cons{hd=H,tl=T}) ->
+    case is_simple(H) of
+	true -> is_simple(T); 
+	false -> false
+    end;
+is_simple(#c_tuple{es=Es}) -> is_simple_list(Es);
+is_simple(#c_binary{segments=Es}) -> is_simp_bin(Es);
+is_simple(E) -> is_atomic(E).
+
+is_simple_list(Es) -> lists:all(fun is_simple/1, Es).
+
+is_simp_bin(Es) ->
+    lists:all(fun (#c_bitstr{val=E,size=S}) ->
+		      is_simple(E) and is_simple(S)
+	      end, Es).
+
+%% is_simple_top(Expr) -> true | false.
+%%  Only check if the top-level is a simple.
+
+is_simple_top(#c_var{}) -> true;
+is_simple_top(#c_cons{}) -> true;
+is_simple_top(#c_tuple{}) -> true;
+is_simple_top(#c_binary{}) -> true;
+is_simple_top(E) -> is_atomic(E).
+
+%% literal_value(LitExpr) -> Value.
+%%  Return the value of LitExpr.
+
+literal_value(#c_char{val=C}) -> C;
+literal_value(#c_int{val=I}) -> I;
+literal_value(#c_float{val=F}) -> F;
+literal_value(#c_atom{val=A}) -> A;
+literal_value(#c_string{val=S}) -> S;
+literal_value(#c_nil{}) -> [];
+literal_value(#c_cons{hd=H,tl=T}) ->
+    [literal_value(H)|literal_value(T)];
+literal_value(#c_tuple{es=Es}) ->
+    list_to_tuple(literal_value_list(Es)).
+
+literal_value_list(Vals) -> lists:map(fun literal_value/1, Vals).
+
+%% make_literal(Value) -> LitExpr.
+%%  Make a literal expression from an Erlang value.
+
+make_literal(I) when integer(I) -> #c_int{val=I};
+make_literal(F) when float(F) -> #c_float{val=F};
+make_literal(A) when atom(A) -> #c_atom{val=A};
+make_literal([]) -> #c_nil{};
+make_literal([H|T]) ->
+    #c_cons{hd=make_literal(H),tl=make_literal(T)};
+make_literal(T) when tuple(T) ->
+    #c_tuple{es=make_literal_list(tuple_to_list(T))}.
+
+make_literal_list(Vals) -> lists:map(fun make_literal/1, Vals). 
+
+%% make_values([CoreExpr] | CoreExpr) -> #c_values{} | CoreExpr.
+%%  Make a suitable values structure, expr or values, depending on
+%%  Expr.
+
+make_values([E]) -> E;
+make_values([H|_]=Es) -> #c_values{anno=get_anno(H),es=Es};
+make_values([]) -> #c_values{es=[]};
+make_values(E) -> E.
+
+%% map(MapFun, CoreExpr) -> CoreExpr.
+%%  This function traverses the core parse format, at each level
+%%  applying the submited argument function, assumed to do the real
+%%  work.
+%%
+%%  The "eager" style, where each component of a construct are
+%%  descended to before the construct itself, admits that some
+%%  companion functions (the F:s) may be made simpler, since it may be
+%%  safely assumed that no lower illegal instanced will be
+%%  created/uncovered by actions on the current level.
+
+map(F, #c_tuple{es=Es}=R) ->
+    F(R#c_tuple{es=map_list(F, Es)});
+map(F, #c_cons{hd=Hd, tl=Tl}=R) ->
+    F(R#c_cons{hd=map(F, Hd), 
+	       tl=map(F, Tl)});
+map(F, #c_values{es=Es}=R) ->
+    F(R#c_values{es=map_list(F, Es)});
+
+map(F, #c_alias{var=Var, pat=Pat}=R) ->
+    F(R#c_alias{var=map(F, Var),
+		pat=map(F, Pat)});
+
+map(F, #c_module{defs=Defs}=R) ->
+    F(R#c_module{defs=map_list(F, Defs)});
+map(F, #c_def{val=Val}=R) ->
+    F(R#c_def{val=map(F, Val)});
+
+map(F, #c_fun{vars=Vars, body=Body}=R) ->
+    F(R#c_fun{vars=map_list(F, Vars),
+	      body=map(F, Body)});
+map(F, #c_let{vars=Vs, arg=Arg, body=Body}=R) ->
+    F(R#c_let{vars=map_list(F, Vs), 
+	      arg=map(F, Arg), 
+	      body=map(F, Body)});
+map(F, #c_letrec{defs=Fs,body=Body}=R) ->
+    F(R#c_letrec{defs=map_list(F, Fs),
+		 body=map(F, Body)});
+map(F, #c_seq{arg=Arg, body=Body}=R) ->
+    F(R#c_seq{arg=map(F, Arg),
+	      body=map(F, Body)});
+map(F, #c_case{arg=Arg, clauses=Clauses}=R) ->
+    F(R#c_case{arg=map(F, Arg),
+	       clauses=map_list(F, Clauses)});
+map(F, #c_clause{pats=Ps, guard=Guard, body=Body}=R) ->
+    F(R#c_clause{pats=map_list(F, Ps), 
+		 guard=map(F, Guard), 
+		 body=map(F, Body)});
+map(F, #c_receive{clauses=Cls, timeout=Tout, action=Act}=R) ->
+    F(R#c_receive{clauses=map_list(F, Cls),
+		  timeout=map(F, Tout),
+		  action=map(F, Act)});
+map(F, #c_apply{op=Op,args=Args}=R) ->
+    F(R#c_apply{op=map(F, Op),
+		args=map_list(F, Args)});
+map(F, #c_call{module=M,name=N,args=Args}=R) ->
+    F(R#c_call{module=map(F, M),
+	       name=map(F, N),
+	       args=map_list(F, Args)});
+map(F, #c_primop{name=N,args=Args}=R) ->
+    F(R#c_primop{name=map(F, N),
+		 args=map_list(F, Args)});
+map(F, #c_try{arg=Expr,vars=Vars,body=Body,evars=Evars,handler=Handler}=R) ->
+    F(R#c_try{arg=map(F, Expr), 
+	      vars=map(F, Vars), 
+	      body=map(F, Body),
+	      evars=map(F, Evars),
+	      handler=map(F, Handler)});
+map(F, #c_catch{body=Body}=R) ->
+    F(R#c_catch{body=map(F, Body)});
+map(F, T) -> F(T).				%Atomic nodes.
+
+map_list(F, L) -> lists:map(fun (E) -> map(F, E) end, L).
+
+%% fold(FoldFun, Accumulator, CoreExpr) -> Accumulator.
+%%  This function traverses the core parse format, at each level
+%%  applying the submited argument function, assumed to do the real
+%%  work, and keeping the accumulated result in the A (accumulator)
+%%  argument.
+
+fold(F, Acc, #c_tuple{es=Es}=R) ->
+    F(R, fold_list(F, Acc, Es));
+fold(F, Acc, #c_cons{hd=Hd, tl=Tl}=R) ->
+    F(R, fold(F, fold(F, Acc, Hd), Tl));
+fold(F, Acc, #c_values{es=Es}=R) ->
+    F(R, fold_list(F, Acc, Es));
+
+fold(F, Acc, #c_alias{pat=P,var=V}=R) ->
+    F(R, fold(F, fold(F, Acc, P), V));
+
+fold(F, Acc, #c_module{defs=Defs}=R) ->
+    F(R, fold_list(F, Acc, Defs));
+fold(F, Acc, #c_def{val=Val}=R) ->
+    F(R, fold(F, Acc, Val));
+
+fold(F, Acc, #c_fun{vars=Vars, body=Body}=R) ->
+    F(R, fold(F, fold_list(F, Acc, Vars), Body));
+fold(F, Acc, #c_let{vars=Vs, arg=Arg, body=Body}=R) ->
+    F(R, fold(F, fold(F, fold_list(F, Acc, Vs), Arg), Body));
+fold(F, Acc, #c_letrec{defs=Fs,body=Body}=R) ->
+    F(R, fold(F, fold_list(F, Acc, Fs), Body));
+fold(F, Acc, #c_seq{arg=Arg, body=Body}=R) ->
+    F(R, fold(F, fold(F, Acc, Arg), Body));
+fold(F, Acc, #c_case{arg=Arg, clauses=Clauses}=R) ->
+    F(R, fold_list(F, fold(F, Acc, Arg), Clauses));
+fold(F, Acc, #c_clause{pats=Ps,guard=G,body=B}=R) ->
+    F(R, fold(F, fold(F, fold_list(F, Acc, Ps), G), B));
+fold(F, Acc, #c_receive{clauses=Cl, timeout=Ti, action=Ac}=R) ->
+    F(R, fold_list(F, fold(F, fold(F, Acc, Ac), Ti), Cl));
+fold(F, Acc, #c_apply{op=Op, args=Args}=R) ->
+    F(R, fold_list(F, fold(F, Acc, Op), Args));
+fold(F, Acc, #c_call{module=Mod,name=Name,args=Args}=R) ->
+    F(R, fold_list(F, fold(F, fold(F, Acc, Mod), Name), Args));
+fold(F, Acc, #c_primop{name=Name,args=Args}=R) ->
+    F(R, fold_list(F, fold(F, Acc, Name), Args));
+fold(F, Acc, #c_try{arg=E,vars=Vs,body=Body,evars=Evs,handler=H}=R) ->
+    NewB = fold(F, fold_list(F, fold(F, Acc, E), Vs), Body),
+    F(R, fold(F, fold_list(F, NewB, Evs), H));
+fold(F, Acc, #c_catch{body=Body}=R) ->
+    F(R, fold(F, Acc, Body));
+fold(F, Acc, T) ->				%Atomic nodes
+    F(T, Acc).
+
+fold_list(F, Acc, L) ->
+    lists:foldl(fun (E, A) -> fold(F, A, E) end, Acc, L).
+
+%% mapfold(MapfoldFun, Accumulator, CoreExpr) -> {CoreExpr,Accumulator}.
+%%  This function traverses the core parse format, at each level
+%%  applying the submited argument function, assumed to do the real
+%%  work, and keeping the accumulated result in the A (accumulator)
+%%  argument.
+
+mapfold(F, Acc0, #c_tuple{es=Es0}=R) ->
+    {Es1,Acc1} = mapfold_list(F, Acc0, Es0),
+    F(R#c_tuple{es=Es1}, Acc1);
+mapfold(F, Acc0, #c_cons{hd=H0,tl=T0}=R) ->
+    {H1,Acc1} = mapfold(F, Acc0, H0),
+    {T1,Acc2} = mapfold(F, Acc1, T0),
+    F(R#c_cons{hd=H1,tl=T1}, Acc2);
+mapfold(F, Acc0, #c_values{es=Es0}=R) ->
+    {Es1,Acc1} = mapfold_list(F, Acc0, Es0),
+    F(R#c_values{es=Es1}, Acc1);
+
+mapfold(F, Acc0, #c_alias{pat=P0,var=V0}=R) ->
+    {P1,Acc1} = mapfold(F, Acc0, P0),
+    {V1,Acc2} = mapfold(F, Acc1, V0),
+    F(R#c_alias{pat=P1,var=V1}, Acc2);
+
+mapfold(F, Acc0, #c_module{defs=D0}=R) ->
+    {D1,Acc1} = mapfold_list(F, Acc0, D0),
+    F(R#c_module{defs=D1}, Acc1);
+mapfold(F, Acc0, #c_def{val=V0}=R) ->
+    {V1,Acc1} = mapfold(F, Acc0, V0),
+    F(R#c_def{val=V1}, Acc1);
+
+mapfold(F, Acc0, #c_fun{vars=Vs0, body=B0}=R) ->
+    {Vs1,Acc1} = mapfold_list(F, Acc0, Vs0),
+    {B1,Acc2} = mapfold(F, Acc1, B0),
+    F(R#c_fun{vars=Vs1,body=B1}, Acc2);
+mapfold(F, Acc0, #c_let{vars=Vs0, arg=A0, body=B0}=R) ->
+    {Vs1,Acc1} = mapfold_list(F, Acc0, Vs0),
+    {A1,Acc2} = mapfold(F, Acc1, A0),
+    {B1,Acc3} = mapfold(F, Acc2, B0),
+    F(R#c_let{vars=Vs1,arg=A1,body=B1}, Acc3);
+mapfold(F, Acc0, #c_letrec{defs=Fs0,body=B0}=R) ->
+    {Fs1,Acc1} = mapfold_list(F, Acc0, Fs0),
+    {B1,Acc2} = mapfold(F, Acc1, B0),
+    F(R#c_letrec{defs=Fs1,body=B1}, Acc2);
+mapfold(F, Acc0, #c_seq{arg=A0, body=B0}=R) ->
+    {A1,Acc1} = mapfold(F, Acc0, A0),
+    {B1,Acc2} = mapfold(F, Acc1, B0),
+    F(R#c_seq{arg=A1,body=B1}, Acc2);
+mapfold(F, Acc0, #c_case{arg=A0,clauses=Cs0}=R) ->
+    {A1,Acc1} = mapfold(F, Acc0, A0),
+    {Cs1,Acc2} = mapfold_list(F, Acc1, Cs0),
+    F(R#c_case{arg=A1,clauses=Cs1}, Acc2);
+mapfold(F, Acc0, #c_clause{pats=Ps0,guard=G0,body=B0}=R) ->
+    {Ps1,Acc1} = mapfold_list(F, Acc0, Ps0),
+    {G1,Acc2} = mapfold(F, Acc1, G0),
+    {B1,Acc3} = mapfold(F, Acc2, B0),
+    F(R#c_clause{pats=Ps1,guard=G1,body=B1}, Acc3);
+mapfold(F, Acc0, #c_receive{clauses=Cs0,timeout=T0,action=A0}=R) ->
+    {T1,Acc1} = mapfold(F, Acc0, T0),
+    {Cs1,Acc2} = mapfold_list(F, Acc1, Cs0),
+    {A1,Acc3} = mapfold(F, Acc2, A0),
+    F(R#c_receive{clauses=Cs1,timeout=T1,action=A1}, Acc3);
+mapfold(F, Acc0, #c_apply{op=Op0, args=As0}=R) ->
+    {Op1,Acc1} = mapfold(F, Acc0, Op0),
+    {As1,Acc2} = mapfold_list(F, Acc1, As0),
+    F(R#c_apply{op=Op1,args=As1}, Acc2);
+mapfold(F, Acc0, #c_call{module=M0,name=N0,args=As0}=R) ->
+    {M1,Acc1} = mapfold(F, Acc0, M0),
+    {N1,Acc2} = mapfold(F, Acc1, N0),
+    {As1,Acc3} = mapfold_list(F, Acc2, As0),
+    F(R#c_call{module=M1,name=N1,args=As1}, Acc3);
+mapfold(F, Acc0, #c_primop{name=N0, args=As0}=R) ->
+    {N1,Acc1} = mapfold(F, Acc0, N0),
+    {As1,Acc2} = mapfold_list(F, Acc1, As0),
+    F(R#c_primop{name=N1,args=As1}, Acc2);
+mapfold(F, Acc0, #c_try{arg=E0,vars=Vs0,body=B0,evars=Evs0,handler=H0}=R) ->
+    {E1,Acc1} = mapfold(F, Acc0, E0),
+    {Vs1,Acc2} = mapfold_list(F, Acc1, Vs0),
+    {B1,Acc3} = mapfold(F, Acc2, B0),
+    {Evs1,Acc4} = mapfold_list(F, Acc3, Evs0),
+    {H1,Acc5} = mapfold(F, Acc4, H0),
+    F(R#c_try{arg=E1,vars=Vs1,body=B1,evars=Evs1,handler=H1}, Acc5);
+mapfold(F, Acc0, #c_catch{body=B0}=R) ->
+    {B1,Acc1} = mapfold(F, Acc0, B0),
+    F(R#c_catch{body=B1}, Acc1);
+mapfold(F, Acc, T) ->				%Atomic nodes
+	F(T, Acc).
+
+mapfold_list(F, Acc, L) ->
+    lists:mapfoldl(fun (E, A) -> mapfold(F, A, E) end, Acc, L).
+
+%% is_var_used(VarName, Expr) -> true | false.
+%%  Test if the variable VarName is used in Expr.
+
+is_var_used(V, B) -> vu_body(V, B).
+
+vu_body(V, #c_values{es=Es}) ->
+    vu_expr_list(V, Es);
+vu_body(V, Body) ->
+    vu_expr(V, Body).
+
+vu_expr(V, #c_var{name=V2}) -> V =:= V2;
+vu_expr(V, #c_cons{hd=H,tl=T}) ->
+    case vu_expr(V, H) of
+	true -> true;
+	false -> vu_expr(V, T)
+    end;
+vu_expr(V, #c_tuple{es=Es}) ->
+    vu_expr_list(V, Es);
+vu_expr(V, #c_binary{segments=Ss}) ->
+    vu_seg_list(V, Ss);
+vu_expr(V, #c_fun{vars=Vs,body=B}) ->
+    %% Variables in fun shadow previous variables
+    case vu_var_list(V, Vs) of
+	true -> false;
+	false -> vu_body(V, B)
+    end;
+vu_expr(V, #c_let{vars=Vs,arg=Arg,body=B}) ->
+    case vu_body(V, Arg) of
+	true -> true;
+	false ->
+	    %% Variables in let shadow previous variables.
+	    case vu_var_list(V, Vs) of
+		true -> false;
+		false -> vu_body(V, B)
+	    end
+    end;
+vu_expr(V, #c_letrec{defs=Fs,body=B}) ->
+    case lists:any(fun (#c_def{val=Fb}) -> vu_body(V, Fb) end, Fs) of
+	true -> true;
+	false -> vu_body(V, B)
+    end;
+vu_expr(V, #c_seq{arg=Arg,body=B}) ->
+    case vu_expr(V, Arg) of
+	true -> true;
+	false -> vu_body(V, B)
+    end;
+vu_expr(V, #c_case{arg=Arg,clauses=Cs}) ->
+    case vu_expr(V, Arg) of
+	true -> true;
+	false -> vu_clauses(V, Cs)
+    end;
+vu_expr(V, #c_receive{clauses=Cs,timeout=T,action=A}) ->
+    case vu_clauses(V, Cs) of
+	true -> true;
+	false ->
+	    case vu_expr(V, T) of
+		true -> true;
+		false -> vu_body(V, A)
+	    end
+    end;
+vu_expr(V, #c_apply{op=Op,args=As}) ->
+    vu_expr_list(V, [Op|As]);
+vu_expr(V, #c_call{module=M,name=N,args=As}) ->
+    vu_expr_list(V, [M,N|As]);
+vu_expr(V, #c_primop{args=As}) ->		%Name is an atom
+    vu_expr_list(V, As);
+vu_expr(V, #c_catch{body=B}) ->
+    vu_body(V, B);
+vu_expr(V, #c_try{arg=E,vars=Vs,body=B,evars=Evs,handler=H}) ->
+    case vu_body(V, E) of
+	true -> true;
+	false ->
+	    %% Variables shadow previous ones.
+	    case case vu_var_list(V, Vs) of
+		     true -> false;
+		     false -> vu_body(V, B)
+		 end of
+		true -> true;
+		false ->
+		    case vu_var_list(V, Evs) of
+			true -> false;
+			false -> vu_body(V, H)
+		    end
+	    end
+    end;
+vu_expr(_, _) -> false.				%Everything else
+
+vu_expr_list(V, Es) ->
+    lists:any(fun(E) -> vu_expr(V, E) end, Es).
+
+vu_seg_list(V, Ss) ->
+    lists:any(fun (#c_bitstr{val=Val,size=Size}) ->
+		      case vu_expr(V, Val) of
+			  true -> true;
+			  false -> vu_expr(V, Size)
+		      end
+	      end, Ss).
+
+%% vu_clause(VarName, Clause) -> true | false.
+%% vu_clauses(VarName, [Clause]) -> true | false.
+%%  Have to get the pattern results right.
+
+vu_clause(V, #c_clause{pats=Ps,guard=G,body=B}) ->
+    case vu_pattern_list(V, Ps) of
+	{true,_Shad} -> true;			%It is used
+	{false,true} -> false;			%Shadowed
+	{false,false} ->			%Not affected
+	    case vu_expr(V, G) of
+		true -> true;
+		false ->vu_body(V, B)
+	    end
+    end.
+
+vu_clauses(V, Cs) ->
+    lists:any(fun(C) -> vu_clause(V, C) end, Cs).
+
+%% vu_pattern(VarName, Pattern) -> {Used,Shadow}.
+%% vu_pattern_list(VarName, [Pattern]) -> {Used,Shadow}.
+%%  Binaries complicate patterns as a variable can both be properly
+%%  used, in a bit segment size, and shadow.  They can also do both.
+
+%%vu_pattern(V, Pat) -> vu_pattern(V, Pat, {false,false}).
+
+vu_pattern(V, #c_var{name=V2}, St) ->
+    setelement(2, St, V =:= V2);
+vu_pattern(V, #c_cons{hd=H,tl=T}, St0) ->
+    case vu_pattern(V, H, St0) of
+	{true,true}=St1 -> St1;			%Nothing more to know
+	St1 -> vu_pattern(V, T, St1)
+    end;
+vu_pattern(V, #c_tuple{es=Es}, St) ->
+    vu_pattern_list(V, Es, St);
+vu_pattern(V, #c_binary{segments=Ss}, St) ->
+    vu_pat_seg_list(V, Ss, St);
+vu_pattern(V, #c_alias{var=Var,pat=P}, St0) ->
+    case vu_pattern(V, Var, St0) of
+	{true,true}=St1 -> St1;
+	St1 -> vu_pattern(V, P, St1)
+    end;
+vu_pattern(_, _, St) -> St.
+
+vu_pattern_list(V, Ps) -> vu_pattern_list(V, Ps, {false,false}).
+
+vu_pattern_list(V, Ps, St0) ->
+    lists:foldl(fun(P, St) -> vu_pattern(V, P, St) end, St0, Ps).
+
+vu_pat_seg_list(V, Ss, St) ->
+    lists:foldl(fun (#c_bitstr{val=Val,size=Size}, St0) ->
+			case vu_pattern(V, Val, St0) of
+			    {true,true}=St1 -> St1;
+			    {_Used,Shad} -> {vu_expr(V, Size),Shad}
+			end
+		end, St, Ss).
+
+%% vu_var_list(VarName, [Var]) -> true | false.
+
+vu_var_list(V, Vs) ->
+    lists:any(fun (#c_var{name=V2}) -> V =:= V2 end, Vs).