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-rw-r--r--lib/compiler/src/beam_except.erl32
-rw-r--r--lib/compiler/test/beam_except_SUITE.erl14
2 files changed, 34 insertions, 12 deletions
diff --git a/lib/compiler/src/beam_except.erl b/lib/compiler/src/beam_except.erl
index 2305502800..2b9c1b0cf5 100644
--- a/lib/compiler/src/beam_except.erl
+++ b/lib/compiler/src/beam_except.erl
@@ -152,7 +152,7 @@ dig_out_fc(Arity, Is0) ->
({test,_,_,_}) -> false;
(_) -> true
end, Is0),
- {Regs,Acc} = dig_out_fc_1(reverse(Is), Regs0, Acc0),
+ {Regs,Acc} = dig_out_fc_1(reverse(Is), Arity, Regs0, Acc0),
case Regs of
#{{x,0}:={atom,function_clause},{x,1}:=Args} ->
case moves_from_stack(Args, 0, []) of
@@ -165,19 +165,27 @@ dig_out_fc(Arity, Is0) ->
no
end.
-dig_out_fc_1([{block,Bl}|Is], Regs0, Acc) ->
+dig_out_fc_1([{block,Bl}|Is], Arity, Regs0, Acc) ->
Regs = dig_out_fc_block(Bl, Regs0),
- dig_out_fc_1(Is, Regs, Acc);
-dig_out_fc_1([{bs_set_position,_,_}=I|Is], Regs, Acc) ->
- dig_out_fc_1(Is, Regs, [I|Acc]);
-dig_out_fc_1([{bs_get_tail,Src,Dst,Live0}|Is], Regs0, Acc) ->
- Regs = prune_xregs(Live0, Regs0),
- Live = dig_out_stack_live(Regs, Live0),
- I = {bs_get_tail,Src,Dst,Live},
- dig_out_fc_1(Is, Regs, [I|Acc]);
-dig_out_fc_1([_|_], _Regs, _Acc) ->
+ dig_out_fc_1(Is, Arity, Regs, Acc);
+dig_out_fc_1([{bs_set_position,_,_}=I|Is], Arity, Regs, Acc) ->
+ dig_out_fc_1(Is, Arity, Regs, [I|Acc]);
+dig_out_fc_1([{bs_get_tail,Src,Dst,Live0}|Is], Arity, Regs0, Acc) ->
+ case Src of
+ {x,X} when X < Arity ->
+ %% The heuristic for determining the number of live
+ %% registers is likely to give an incorrect result.
+ %% Give up.
+ {#{},[]};
+ _ ->
+ Regs = prune_xregs(Live0, Regs0),
+ Live = dig_out_stack_live(Regs, Live0),
+ I = {bs_get_tail,Src,Dst,Live},
+ dig_out_fc_1(Is, Arity, Regs, [I|Acc])
+ end;
+dig_out_fc_1([_|_], _Arity, _Regs, _Acc) ->
{#{},[]};
-dig_out_fc_1([], Regs, Acc) ->
+dig_out_fc_1([], _Arity, Regs, Acc) ->
{Regs,Acc}.
dig_out_fc_block([{set,[],[],{alloc,Live,_}}|Is], Regs0) ->
diff --git a/lib/compiler/test/beam_except_SUITE.erl b/lib/compiler/test/beam_except_SUITE.erl
index 67947dc292..f52239f2a8 100644
--- a/lib/compiler/test/beam_except_SUITE.erl
+++ b/lib/compiler/test/beam_except_SUITE.erl
@@ -72,11 +72,25 @@ bs_get_tail(Config) ->
{function_clause,
[{?MODULE,bs_get_tail_1,[<<>>,0,0,Config],_}|_]}} =
(catch bs_get_tail_1(id(<<>>), 0, 0, Config)),
+
+ ok = bs_get_tail_2(<<"W">>, <<"X">>, <<"Z">>),
+ ok = bs_get_tail_2(<<"M">>, <<"X">>, <<"Z">>),
+ {'EXIT',
+ {function_clause,
+ [{?MODULE,do_get_bs_tail_2,[<<"A">>,<<"B">>,[],<<"C">>],_}|_]}} =
+ (catch bs_get_tail_2(<<"A">>, <<"B">>, <<"C">>)),
+
ok.
bs_get_tail_1(<<_:32, Rest/binary>>, Z1, Z2, F1) ->
{Rest,Z1,Z2,F1}.
+bs_get_tail_2(A, B, C) ->
+ do_get_bs_tail_2(A, B, [], C).
+
+do_get_bs_tail_2(<<"W">>, <<"X">>, _, <<"Z">>) -> ok;
+do_get_bs_tail_2(<<"M">>, <<"X">>, _, <<"Z">>) -> ok.
+
coverage(_) ->
File = {file,"fake.erl"},
ok = fc(a),