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-rw-r--r--lib/compiler/test/bs_match_SUITE.erl32
1 files changed, 30 insertions, 2 deletions
diff --git a/lib/compiler/test/bs_match_SUITE.erl b/lib/compiler/test/bs_match_SUITE.erl
index b4601b0798..7fb0a16540 100644
--- a/lib/compiler/test/bs_match_SUITE.erl
+++ b/lib/compiler/test/bs_match_SUITE.erl
@@ -36,7 +36,8 @@
match_string/1,zero_width/1,bad_size/1,haystack/1,
cover_beam_bool/1,matched_out_size/1,follow_fail_branch/1,
no_partition/1,calling_a_binary/1,binary_in_map/1,
- match_string_opt/1,map_and_binary/1]).
+ match_string_opt/1,map_and_binary/1,
+ unsafe_branch_caching/1]).
-export([coverage_id/1,coverage_external_ignore/2]).
@@ -62,7 +63,8 @@ groups() ->
otp_7498,match_string,zero_width,bad_size,haystack,
cover_beam_bool,matched_out_size,follow_fail_branch,
no_partition,calling_a_binary,binary_in_map,
- match_string_opt,map_and_binary]}].
+ match_string_opt,map_and_binary,
+ unsafe_branch_caching]}].
init_per_suite(Config) ->
@@ -1243,6 +1245,32 @@ do_map_and_binary(#{time := _} = T) ->
do_map_and_binary(#{hour := Hour, min := Min} = T) ->
{Hour, Min, T}.
+%% Unsafe caching of branch outcomes in beam_bsm would cause the
+%% delayed creation of sub-binaries optimization to be applied even
+%% when it was unsafe.
+
+unsafe_branch_caching(_Config) ->
+ <<>> = do_unsafe_branch_caching(<<42,1>>),
+ <<>> = do_unsafe_branch_caching(<<42,2>>),
+ <<>> = do_unsafe_branch_caching(<<42,3>>),
+ <<17,18>> = do_unsafe_branch_caching(<<42,3,17,18>>),
+ <<>> = do_unsafe_branch_caching(<<1,3,42,2>>),
+
+ ok.
+
+do_unsafe_branch_caching(<<Code/integer, Bin/binary>>) ->
+ <<C1/integer, B1/binary>> = Bin,
+ case C1 of
+ X when X =:= 1 orelse X =:= 2 ->
+ Bin2 = <<>>;
+ _ ->
+ Bin2 = B1
+ end,
+ case Code of
+ 1 -> do_unsafe_branch_caching(Bin2);
+ _ -> Bin2
+ end.
+
check(F, R) ->
R = F().