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authorBjörn Gustavsson <[email protected]>2017-12-13 10:39:22 +0100
committerBjörn Gustavsson <[email protected]>2017-12-15 12:31:28 +0100
commitbeb15397b746cb20d00f6585e115ac2a112b18ad (patch)
tree7e6d9bd72fbc083e839c31517b6374577c89e54a /lib
parent47f61b16efe9f4304a522f54a4b630a6ffc08b06 (diff)
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beam_utils: Improve precision for is_not_used/3
Diffstat (limited to 'lib')
-rw-r--r--lib/compiler/src/beam_utils.erl13
-rw-r--r--lib/compiler/test/beam_utils_SUITE.erl48
2 files changed, 58 insertions, 3 deletions
diff --git a/lib/compiler/src/beam_utils.erl b/lib/compiler/src/beam_utils.erl
index bd1423cb40..6f20fc94de 100644
--- a/lib/compiler/src/beam_utils.erl
+++ b/lib/compiler/src/beam_utils.erl
@@ -380,9 +380,16 @@ check_liveness(R, [{bs_init,_,_,none,Ss,Dst}|Is], St) ->
check_liveness(R, [{bs_init,_,_,Live,Ss,Dst}|Is], St) ->
case R of
{x,X} ->
- case X < Live orelse member(R, Ss) of
- true -> {used,St};
- false -> {killed,St}
+ case member(R, Ss) of
+ true ->
+ {used,St};
+ false ->
+ if
+ X < Live ->
+ not_used(check_liveness(R, Is, St));
+ true ->
+ {killed,St}
+ end
end;
{y,_} ->
case member(R, Ss) of
diff --git a/lib/compiler/test/beam_utils_SUITE.erl b/lib/compiler/test/beam_utils_SUITE.erl
index d516b0c3c7..7686e69b63 100644
--- a/lib/compiler/test/beam_utils_SUITE.erl
+++ b/lib/compiler/test/beam_utils_SUITE.erl
@@ -122,6 +122,15 @@ bs_init(_Config) ->
{'EXIT',{badarg,_}} = (catch do_bs_init_2([0.5])),
{'EXIT',{badarg,_}} = (catch do_bs_init_2([-1])),
{'EXIT',{badarg,_}} = (catch do_bs_init_2([1 bsl 32])),
+
+ <<>> = do_bs_init_3({tag,0}, 0, 0),
+ <<0>> = do_bs_init_3({tag,0}, 2, 1),
+
+ <<"_build/shared">> = do_bs_init_4([], false),
+ <<"abc/shared">> = do_bs_init_4(<<"abc">>, false),
+ <<"foo/foo">> = do_bs_init_4(<<"foo">>, true),
+ error = do_bs_init_4([], not_boolean),
+
ok.
do_bs_init_1([?MODULE], Sz) ->
@@ -139,6 +148,45 @@ do_bs_init_2(SigNos) ->
erlang:error(badarg)
>>.
+do_bs_init_3({tag,Pos}, Offset, Len) ->
+ N0 = Offset - Pos,
+ N = if N0 > Len -> Len;
+ true -> N0
+ end,
+ <<0:N/unit:8>>.
+
+do_bs_init_4(Arg1, Arg2) ->
+ Build =
+ case id(Arg1) of
+ X when X =:= [] orelse X =:= false -> <<"_build">>;
+ X -> X
+ end,
+ case id(Arg2) of
+ true ->
+ id(<<case Build of
+ Rewrite when is_binary(Rewrite) ->
+ Rewrite;
+ Rewrite ->
+ id(Rewrite)
+ end/binary,
+ "/",
+ case id(<<"foo">>) of
+ Rewrite when is_binary(Rewrite) ->
+ Rewrite;
+ Rewrite ->
+ id(Rewrite)
+ end/binary>>);
+ false ->
+ id(<<case Build of
+ Rewrite when is_binary(Rewrite) ->
+ Rewrite;
+ Rewrite ->
+ id(Rewrite)
+ end/binary,
+ "/shared">>);
+ Other ->
+ error
+ end.
bs_save(_Config) ->
{a,30,<<>>} = do_bs_save(<<1:1,30:5>>),