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authorSverker Eriksson <[email protected]>2014-09-03 20:22:42 +0200
committerSverker Eriksson <[email protected]>2014-09-04 17:33:22 +0200
commit21e4cf5b378ed378296a544d0ad8da08cf95700e (patch)
tree4b248f4e232cc9658767b9b15b5aa4ac85fef2d4
parent9de7cc7f881b5df18d0a26f7d37af164bc0c390e (diff)
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erts: Correct conversion of MIN_SMALL numeral to fixnum
list_to_integer and binary_to_integer returned un-normalized bignum for -134217728 on 32-bit and -576460752303423488 on 64-bit. Thanks to Jesper Louis Andersen, Mikael Pettersson and Anthony Ramine for report, initial patch and optimization suggestion.
-rw-r--r--erts/emulator/beam/bif.c13
-rw-r--r--erts/emulator/beam/big.c11
-rw-r--r--erts/emulator/test/num_bif_SUITE.erl32
3 files changed, 28 insertions, 28 deletions
diff --git a/erts/emulator/beam/bif.c b/erts/emulator/beam/bif.c
index fcbeb6cf5c..b835946729 100644
--- a/erts/emulator/beam/bif.c
+++ b/erts/emulator/beam/bif.c
@@ -1,7 +1,7 @@
/*
* %CopyrightBegin%
*
- * Copyright Ericsson AB 1996-2013. All Rights Reserved.
+ * Copyright Ericsson AB 1996-2014. All Rights Reserved.
*
* 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
@@ -2887,9 +2887,6 @@ static int do_list_to_integer(Process *p, Eterm orig_list,
res = big_plus_small(res, m, hp);
}
- if (is_big(res)) /* check if small */
- res = big_plus_small(res, 0, hp); /* includes conversion to small */
-
if (neg) {
if (is_small(res))
res = make_small(-signed_val(res));
@@ -2899,8 +2896,12 @@ static int do_list_to_integer(Process *p, Eterm orig_list,
}
}
- if (is_big(res)) {
- hp += (big_arity(res)+1);
+ if (is_not_small(res)) {
+ res = big_plus_small(res, 0, hp); /* includes conversion to small */
+
+ if (is_not_small(res)) {
+ hp += (big_arity(res)+1);
+ }
}
HRelease(p,hp_end,hp);
}
diff --git a/erts/emulator/beam/big.c b/erts/emulator/beam/big.c
index e62caa6b22..a8710dd910 100644
--- a/erts/emulator/beam/big.c
+++ b/erts/emulator/beam/big.c
@@ -2675,9 +2675,6 @@ Eterm erts_chars_to_integer(Process *BIF_P, char *bytes,
res = big_plus_small(res, m, hp);
}
- if (is_big(res)) /* check if small */
- res = big_plus_small(res, 0, hp); /* includes conversion to small */
-
if (neg) {
if (is_small(res))
res = make_small(-signed_val(res));
@@ -2687,8 +2684,12 @@ Eterm erts_chars_to_integer(Process *BIF_P, char *bytes,
}
}
- if (is_big(res)) {
- hp += (big_arity(res) + 1);
+ if (is_not_small(res)) {
+ res = big_plus_small(res, 0, hp); /* includes conversion to small */
+
+ if (is_not_small(res)) {
+ hp += (big_arity(res) + 1);
+ }
}
HRelease(BIF_P, hp_end, hp);
goto bytebuf_to_integer_1_done;
diff --git a/erts/emulator/test/num_bif_SUITE.erl b/erts/emulator/test/num_bif_SUITE.erl
index ff8d18eef8..8cf8377c30 100644
--- a/erts/emulator/test/num_bif_SUITE.erl
+++ b/erts/emulator/test/num_bif_SUITE.erl
@@ -1,7 +1,7 @@
%%
%% %CopyrightBegin%
%%
-%% Copyright Ericsson AB 1997-2013. All Rights Reserved.
+%% Copyright Ericsson AB 1997-2014. All Rights Reserved.
%%
%% 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
@@ -394,18 +394,15 @@ t_string_to_integer(Config) when is_list(Config) ->
test_sti(268435455),
test_sti(-268435455),
- %% 1 bsl 28 - 1, just before 32 bit bignum
- test_sti(1 bsl 28 - 1),
- %% 1 bsl 28, just beyond 32 bit small
- test_sti(1 bsl 28),
- %% 1 bsl 33, just beyond 32 bit
- test_sti(1 bsl 33),
- %% 1 bsl 60 - 1, just before 64 bit bignum
- test_sti(1 bsl 60 - 1),
- %% 1 bsl 60, just beyond 64 bit small
- test_sti(1 bsl 60),
- %% 1 bsl 65, just beyond 64 bit
- test_sti(1 bsl 65),
+ % Interesting values around 2-pows, such as MIN_SMALL and MAX_SMALL.
+ lists:foreach(fun(Bits) ->
+ N = 1 bsl Bits,
+ test_sti(N - 1),
+ test_sti(N),
+ test_sti(N + 1)
+ end,
+ lists:seq(16, 130)),
+
%% Bignums.
test_sti(123456932798748738738,16),
test_sti(list_to_integer(lists:duplicate(2000, $1))),
@@ -454,10 +451,11 @@ test_sti(Num) ->
end|| Base <- lists:seq(2,36)].
test_sti(Num,Base) ->
- Num = list_to_integer(int2list(Num,Base),Base),
- Num = -1*list_to_integer(int2list(Num*-1,Base),Base),
- Num = binary_to_integer(int2bin(Num,Base),Base),
- Num = -1*binary_to_integer(int2bin(Num*-1,Base),Base).
+ Neg = -Num,
+ Num = list_to_integer(int2list(Num,Base),Base),
+ Neg = list_to_integer(int2list(Num*-1,Base),Base),
+ Num = binary_to_integer(int2bin(Num,Base),Base),
+ Neg = binary_to_integer(int2bin(Num*-1,Base),Base).
% Calling this function (which is not supposed to be inlined) prevents
% the compiler from calculating the answer, so we don't test the compiler