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authorAnthony Ramine <[email protected]>2014-03-04 02:08:06 +0100
committerAnthony Ramine <[email protected]>2014-03-04 02:08:06 +0100
commitd5fc107d5ae384bfb7b7ea1a10291b75d821c666 (patch)
treed828cfb90dec8bfcb63dddd88a1c510d0b9f3954 /lib
parenta74e66a68f3b4ed590f928b4fd4f0808c6287a32 (diff)
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Properly detect nonboolean protected expressions in beam_bool
Silly code such as the following could make the compiler crash: f() when erlang:float(self()); true -> ok. Reported-by: Ulf Norell
Diffstat (limited to 'lib')
-rw-r--r--lib/compiler/src/beam_bool.erl12
-rw-r--r--lib/compiler/test/guard_SUITE.erl8
2 files changed, 14 insertions, 6 deletions
diff --git a/lib/compiler/src/beam_bool.erl b/lib/compiler/src/beam_bool.erl
index 124abd13c1..890fbfbf4b 100644
--- a/lib/compiler/src/beam_bool.erl
+++ b/lib/compiler/src/beam_bool.erl
@@ -391,10 +391,14 @@ bopt_tree([{set,_,_,{bif,'xor',_}}|_], _, _) ->
throw('xor');
bopt_tree([{protected,[Dst],Code,_}|Is], Forest0, Pre) ->
ProtForest0 = gb_trees:from_orddict([P || {_,any}=P <- gb_trees:to_list(Forest0)]),
- {ProtPre,[{_,ProtTree}]} = bopt_tree(Code, ProtForest0, []),
- Prot = {prot,ProtPre,ProtTree},
- Forest = gb_trees:enter(Dst, Prot, Forest0),
- bopt_tree(Is, Forest, Pre);
+ case bopt_tree(Code, ProtForest0, []) of
+ {ProtPre,[{_,ProtTree}]} ->
+ Prot = {prot,ProtPre,ProtTree},
+ Forest = gb_trees:enter(Dst, Prot, Forest0),
+ bopt_tree(Is, Forest, Pre);
+ _Res ->
+ throw(not_boolean_expr)
+ end;
bopt_tree([{set,[Dst],[Src],move}=Move|Is], Forest, Pre) ->
case {Src,Dst} of
{{tmp,_},_} -> throw(move);
diff --git a/lib/compiler/test/guard_SUITE.erl b/lib/compiler/test/guard_SUITE.erl
index a0a9bb7ddd..3350d18bcc 100644
--- a/lib/compiler/test/guard_SUITE.erl
+++ b/lib/compiler/test/guard_SUITE.erl
@@ -33,7 +33,7 @@
tricky/1,rel_ops/1,literal_type_tests/1,
basic_andalso_orelse/1,traverse_dcd/1,
check_qlc_hrl/1,andalso_semi/1,t_tuple_size/1,binary_part/1,
- bad_constants/1]).
+ bad_constants/1,bad_guards/1]).
suite() -> [{ct_hooks,[ts_install_cth]}].
@@ -50,7 +50,7 @@ groups() ->
t_is_boolean,is_function_2,tricky,rel_ops,
literal_type_tests,basic_andalso_orelse,traverse_dcd,
check_qlc_hrl,andalso_semi,t_tuple_size,binary_part,
- bad_constants]}].
+ bad_constants,bad_guards]}].
init_per_suite(Config) ->
Config.
@@ -1550,6 +1550,10 @@ bad_constants(Config) when is_list(Config) ->
?line ?FAILING(3.14),
ok.
+bad_guards(Config) when is_list(Config) ->
+ if erlang:float(self()); true -> ok end,
+ ok.
+
%% Call this function to turn off constant propagation.
id(I) -> I.