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authorBjörn Gustavsson <[email protected]>2017-09-29 07:17:01 +0200
committerBjörn Gustavsson <[email protected]>2017-09-29 07:46:49 +0200
commit7715f437ab9a789e0500873b6002a49bfe69009c (patch)
treebd1829ea9bca8ef4b5a9fa21191433b5b0ef3543 /lib/compiler/src/beam_validator.erl
parent02fd746c40e829adbe77cc526c7df904698e2534 (diff)
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Fix incorrect internal consistency failure for binary matching code
4c31fd0b9665 made the merging of match contexts stricter; in fact, a little bit too strict. Two match contexts with different number of slots would be downgraded to the 'term' type. The correct way is to keep the match context but set the number of slots to the lowest number of slots of the two match contexts. https://bugs.erlang.org/browse/ERL-490
Diffstat (limited to 'lib/compiler/src/beam_validator.erl')
-rw-r--r--lib/compiler/src/beam_validator.erl6
1 files changed, 3 insertions, 3 deletions
diff --git a/lib/compiler/src/beam_validator.erl b/lib/compiler/src/beam_validator.erl
index 00901077d3..be8908dd6b 100644
--- a/lib/compiler/src/beam_validator.erl
+++ b/lib/compiler/src/beam_validator.erl
@@ -1430,13 +1430,13 @@ merge_types(bool, {atom,A}) ->
merge_bool(A);
merge_types({atom,A}, bool) ->
merge_bool(A);
-merge_types(#ms{id=Id1,valid=B0,slots=Slots},
- #ms{id=Id2,valid=B1,slots=Slots}) ->
+merge_types(#ms{id=Id1,valid=B1,slots=Slots1},
+ #ms{id=Id2,valid=B2,slots=Slots2}) ->
Id = if
Id1 =:= Id2 -> Id1;
true -> make_ref()
end,
- #ms{id=Id,valid=B0 band B1,slots=Slots};
+ #ms{id=Id,valid=B1 band B2,slots=min(Slots1, Slots2)};
merge_types(T1, T2) when T1 =/= T2 ->
%% Too different. All we know is that the type is a 'term'.
term.