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| author | Björn Gustavsson <[email protected]> | 2015-04-21 18:00:27 +0200 |
|---|---|---|
| committer | Björn Gustavsson <[email protected]> | 2015-04-29 12:23:42 +0200 |
| commit | 808e43007754cb68dbe947ec6752698167b1c470 (patch) | |
| tree | 85cf89e05606bb61dfc9246086d3f97cfbed946c | |
| parent | 5440c67570b9d436301cdb2f8234730a1fa8287f (diff) | |
| download | otp-808e43007754cb68dbe947ec6752698167b1c470.tar.gz otp-808e43007754cb68dbe947ec6752698167b1c470.tar.bz2 otp-808e43007754cb68dbe947ec6752698167b1c470.zip | |
beam_utils: Teach check_liveness/3 to understand get_map_elements
Understanding get_map_elements improves the stack trimming done
by beam_trim.
| -rw-r--r-- | lib/compiler/src/beam_utils.erl | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/lib/compiler/src/beam_utils.erl b/lib/compiler/src/beam_utils.erl index fca13497ba..a0132b99e3 100644 --- a/lib/compiler/src/beam_utils.erl +++ b/lib/compiler/src/beam_utils.erl @@ -468,6 +468,22 @@ check_liveness(R, [{loop_rec_end,{f,Fail}}|_], St) -> check_liveness_at(R, Fail, St); check_liveness(R, [{line,_}|Is], St) -> check_liveness(R, Is, St); +check_liveness(R, [{get_map_elements,{f,Fail},S,{list,L}}|Is], St0) -> + {Ss,Ds} = split_even(L), + case member(R, [S|Ss]) of + true -> + {used,St0}; + false -> + case check_liveness_at(R, Fail, St0) of + {killed,St}=Killed -> + case member(R, Ds) of + true -> Killed; + false -> check_liveness(R, Is, St) + end; + Other -> + Other + end + end; check_liveness(_R, Is, St) when is_list(Is) -> %% case Is of %% [I|_] -> |