From 01442bb8d4d1f62f8a4f95d5b89bda725bf1423d Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Magnus=20L=C3=A5ng?= Date: Fri, 20 Nov 2015 17:43:51 +0100 Subject: hipe: Guard against enormous numbers in ranges This allows us to compile bs_match_int_SUITE with HiPE without a system_limit crash. --- lib/hipe/icode/hipe_icode_primops.erl | 24 +++++++++++++++++++++--- 1 file changed, 21 insertions(+), 3 deletions(-) (limited to 'lib/hipe/icode/hipe_icode_primops.erl') diff --git a/lib/hipe/icode/hipe_icode_primops.erl b/lib/hipe/icode/hipe_icode_primops.erl index c2b4fb1afc..84aae30291 100644 --- a/lib/hipe/icode/hipe_icode_primops.erl +++ b/lib/hipe/icode/hipe_icode_primops.erl @@ -505,11 +505,13 @@ type(Primop, Args) -> NewMatchState = erl_types:t_matchstate_update_present(NewBinType, MatchState), if Signed =:= 0 -> - erl_types:t_product([erl_types:t_from_range(0, 1 bsl Size - 1), + UpperBound = inf_add(safe_bsl(1, Size), -1), + erl_types:t_product([erl_types:t_from_range(0, UpperBound), NewMatchState]); Signed =:= 4 -> - erl_types:t_product([erl_types:t_from_range(- (1 bsl (Size-1)), - (1 bsl (Size-1)) - 1), + erl_types:t_product([erl_types:t_from_range( + inf_inv(safe_bsl(1, Size-1)), + inf_add(safe_bsl(1, Size-1), -1)), NewMatchState]) end; [_Arg] -> @@ -966,3 +968,19 @@ check_fun_args(_, _) -> match_bin(Pattern, Match) -> erl_types:t_bitstr_match(Pattern, Match). + +safe_bsl(0, _) -> 0; +safe_bsl(Base, Shift) when Shift =< 128 -> Base bsl Shift; +safe_bsl(Base, _Shift) when Base > 0 -> pos_inf; +safe_bsl(Base, _Shift) when Base < 0 -> neg_inf. + +inf_inv(pos_inf) -> neg_inf; +inf_inv(neg_inf) -> pos_inf; +inf_inv(Number) -> -Number. + +inf_add(pos_inf, _Number) -> pos_inf; +inf_add(neg_inf, _Number) -> neg_inf; +inf_add(_Number, pos_inf) -> pos_inf; +inf_add(_Number, neg_inf) -> neg_inf; +inf_add(Number1, Number2) when is_integer(Number1), is_integer(Number2) -> + Number1 + Number2. -- cgit v1.2.3