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authorErlang/OTP <[email protected]>2017-11-15 14:39:58 +0100
committerErlang/OTP <[email protected]>2017-11-15 14:39:58 +0100
commit59de2ff0e39ca427aa8c075f127869fec7791dad (patch)
treebe2cbf7fd6daeca9cef0df5d4d6af1207b0534d0 /lib
parentf84f3547d4f47ba8c6b5bcf7c032cbc96f59fda0 (diff)
parentc803276c92bce2ed739f87f353108daff21c0d91 (diff)
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Merge branch 'john/compiler/fail-labels-in-blocks-otp-18/ERIERL-48/OTP-14522' into maint-18
* john/compiler/fail-labels-in-blocks-otp-18/ERIERL-48/OTP-14522: compiler: Fix live regs update on allocate in validator Take fail labels into account when determining liveness in block ops
Diffstat (limited to 'lib')
-rw-r--r--lib/compiler/src/beam_utils.erl62
-rw-r--r--lib/compiler/src/beam_validator.erl4
2 files changed, 38 insertions, 28 deletions
diff --git a/lib/compiler/src/beam_utils.erl b/lib/compiler/src/beam_utils.erl
index fbcd5de1bb..1945fadfd3 100644
--- a/lib/compiler/src/beam_utils.erl
+++ b/lib/compiler/src/beam_utils.erl
@@ -779,37 +779,47 @@ live_opt([{recv_mark,_}=I|Is], Regs, D, Acc) ->
live_opt([], _, _, Acc) -> Acc.
-live_opt_block([{set,Ds,Ss,Op}=I0|Is], Regs0, D, Acc) ->
+live_opt_block([{set,Ds,Ss,Op0}|Is], Regs0, D, Acc) ->
Regs1 = x_live(Ss, x_dead(Ds, Regs0)),
- {I,Regs} = case Op of
- {alloc,Live0,Alloc} ->
- %% The life-time analysis used by the code generator
- %% is sometimes too conservative, so it may be
- %% possible to lower the number of live registers
- %% based on the exact liveness information.
- %% The main benefit is that more optimizations that
- %% depend on liveness information (such as the
- %% beam_bool and beam_dead passes) may be applied.
- Live = live_regs(Regs1),
- true = Live =< Live0, %Assertion.
- I1 = {set,Ds,Ss,{alloc,Live,Alloc}},
- {I1,live_call(Live)};
- _ ->
- {I0,Regs1}
- end,
+ {Op, Regs} = live_opt_block_op(Op0, Regs1, D),
+ I = {set, Ds, Ss, Op},
+
case Ds of
- [{x,X}] ->
- case (not is_live(X, Regs0)) andalso Op =:= move of
- true ->
- live_opt_block(Is, Regs0, D, Acc);
- false ->
- live_opt_block(Is, Regs, D, [I|Acc])
- end;
- _ ->
- live_opt_block(Is, Regs, D, [I|Acc])
+ [{x,X}] ->
+ case (not is_live(X, Regs0)) andalso Op =:= move of
+ true ->
+ live_opt_block(Is, Regs0, D, Acc);
+ false ->
+ live_opt_block(Is, Regs, D, [I|Acc])
+ end;
+ _ ->
+ live_opt_block(Is, Regs, D, [I|Acc])
end;
+
live_opt_block([], Regs, _, Acc) -> {Acc,Regs}.
+live_opt_block_op({alloc,Live0,AllocOp}, Regs0, D) ->
+ Regs =
+ case AllocOp of
+ {Kind, _N, Fail} when Kind =:= gc_bif; Kind =:= put_map ->
+ live_join_label(Fail, D, Regs0);
+ _ ->
+ Regs0
+ end,
+
+ %% The life-time analysis used by the code generator is sometimes too
+ %% conservative, so it may be possible to lower the number of live
+ %% registers based on the exact liveness information. The main benefit is
+ %% that more optimizations that depend on liveness information (such as the
+ %% beam_bool and beam_dead passes) may be applied.
+ Live = live_regs(Regs),
+ true = Live =< Live0,
+ {{alloc,Live,AllocOp}, live_call(Live)};
+live_opt_block_op({bif,_N,Fail} = Op, Regs, D) ->
+ {Op, live_join_label(Fail, D, Regs)};
+live_opt_block_op(Op, Regs, _D) ->
+ {Op, Regs}.
+
live_join_labels([{f,L}|T], D, Regs0) when L =/= 0 ->
Regs = gb_trees:get(L, D) bor Regs0,
live_join_labels(T, D, Regs);
diff --git a/lib/compiler/src/beam_validator.erl b/lib/compiler/src/beam_validator.erl
index 6004f1974e..b18eb47d0e 100644
--- a/lib/compiler/src/beam_validator.erl
+++ b/lib/compiler/src/beam_validator.erl
@@ -899,9 +899,9 @@ verify_call_match_context(Lbl, #vst{ft=Ft}) ->
error({binary_and_context_regs_different,Bin,Ctx})
end.
-allocate(Zero, Stk, Heap, Live, #vst{current=#st{numy=none}=St}=Vst0) ->
+allocate(Zero, Stk, Heap, Live, #vst{current=#st{numy=none}}=Vst0) ->
verify_live(Live, Vst0),
- Vst = prune_x_regs(Live, Vst0),
+ Vst = #vst{current=St} = prune_x_regs(Live, Vst0),
Ys = init_regs(Stk, case Zero of
true -> initialized;
false -> uninitialized