| Author |
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| uffe |
 Posted: Thu Nov 23, 2006 9:05 pm |
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User
Joined: 02 Mar 2005
Posts: 365
Location: Sweden
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When I switched from R11B to R11B-2 on my Ubuntu, I started getting
strange syntax errors in a file generated by leex.
The .xrl file, as well as the leex.[eh]rl files used are at
http://erlhive.svn.sourceforge.net/viewvc/erlhive/lib/erlhive/src/
After some tracing, I decided that the bug seems to be in erl_pp.erl. I
cut out the call to erl_pp that I picked up from tracing on leex, and ran
it in both R11 (stdlib-1.14.1) and R11B-2 (stdlib-1.14.2). Results follow:
uwiger@labpc8195:~/dev/leex_bug$ ~/lib/otp/r11b-2/bin/erl
Erlang (BEAM) emulator version 5.5.2 [source] [async-threads:0] [hipe]
[kernel-poll:false]
Eshell V5.5.2 (abort with ^G)
1> io:format("~s~n",
[erl_pp:exprs([{match,14,{var,14,'Atom'},{call,14,{atom,14,list_to_atom},[{var,14,'YYtext'}]}},{tuple,15,[{atom,15,token},{'case',15,{call,15,{atom,15,reserved_word},[{var,15,'Atom'}]},[{clause,16,[{atom,16,true}],[],[{tuple,16,[{var,16,'Atom'},{var,16,'YYline'}]}]},{clause,17,[{atom,17,false}],[],[{tuple,17,[{atom,17,atom},{var,17,'YYline'},
{var,17,'Atom'}]}]}]}]}],4,none)]).
Atom = list_to_atom(YYtext){token,
case reserved_word(Atom) of
true -> {Atom,YYline}; false -> {atom,YYline,Atom}
end}
ok
2>
BREAK: (a)bort (c)ontinue (p)roc info (i)nfo (l)oaded
(v)ersion (k)ill (D)b-tables (d)istribution
a
uwiger@labpc8195:~/dev/leex_bug$ ~/lib/otp/r11b/bin/erl
Erlang (BEAM) emulator version 5.5.1 [source] [async-threads:0] [hipe]
Eshell V5.5.1 (abort with ^G)
1> io:format("~s~n",
[erl_pp:exprs([{match,14,{var,14,'Atom'},{call,14,{atom,14,list_to_atom},[{var,14,'YYtext'}]}},{tuple,15,[{atom,15,token},{'case',15,{call,15,{atom,15,reserved_word},[{var,15,'Atom'}]},[{clause,16,[{atom,16,true}],[],[{tuple,16,[{var,16,'Atom'},{var,16,'YYline'}]}]},{clause,17,[{atom,17,false}],[],[{tuple,17,[{atom,17,atom},{var,17,'YYline'},
{var,17,'Atom'}]}]}]}]}],4,none)]).
Atom = list_to_atom(YYtext),
{token,
case reserved_word(Atom) of
true ->
{Atom,YYline};
false ->
{atom,YYline,Atom}
end}
ok
My debugging ended with running a diff on erl_pp between stdlib-1.4.1 and
stdlib-1.4.2, but the module seems to have been quite heavily modified.
BR,
Ulf W
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| Guest |
| Posted: Fri Nov 24, 2006 8:11 am |
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Guest
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[Ulf Wiger:]
> After some tracing, I decided that the bug seems to be in erl_pp.erl.
Thanks for taking the time to investigate this problem.
The bug has been fixed in patch erl_891_otp_beam.
What follows is a diff for those who haven't got access to the
Erlang/OTP Licensees' Area:
*** stdlib/src/erl_pp.erl Mon Nov 6 14:52:04 2006
--- erl_pp.erl Tue Nov 14 15:27:43 2006
***************
*** 81,87 ****
exprs(Es, 0, Hook).
exprs(Es, I, Hook) ->
! map(fun(Item) -> frmt(Item, I) end, lexprs(Es, Hook)).
expr(E) ->
frmt(lexpr(E, 0, none)).
--- 81,87 ----
exprs(Es, 0, Hook).
exprs(Es, I, Hook) ->
! frmt({seq,[],[],[$,],lexprs(Es, Hook)}, I).
expr(E) ->
frmt(lexpr(E, 0, none)).
Best regards,
Hans Bolinder, Erlang/OTP
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