diff options
Diffstat (limited to 'lib/compiler/src/beam_utils.erl')
| -rw-r--r-- | lib/compiler/src/beam_utils.erl | 29 |
1 files changed, 22 insertions, 7 deletions
diff --git a/lib/compiler/src/beam_utils.erl b/lib/compiler/src/beam_utils.erl index 45cdf8a659..116ede0bc9 100644 --- a/lib/compiler/src/beam_utils.erl +++ b/lib/compiler/src/beam_utils.erl @@ -1,7 +1,7 @@ %% %% %CopyrightBegin% %% -%% Copyright Ericsson AB 2007-2010. All Rights Reserved. +%% Copyright Ericsson AB 2007-2011. All Rights Reserved. %% %% The contents of this file are subject to the Erlang Public License, %% Version 1.1, (the "License"); you may not use this file except in @@ -26,7 +26,7 @@ code_at/2,bif_to_test/3,is_pure_test/1, live_opt/1,delete_live_annos/1,combine_heap_needs/2]). --import(lists, [member/2,sort/1,reverse/1]). +-import(lists, [member/2,sort/1,reverse/1,splitwith/2]). -record(live, {bl, %Block check fun. @@ -195,10 +195,14 @@ is_pure_test({test,Op,_,Ops}) -> %% Also insert {'%live',Live} annotations at the beginning %% and end of each block. %% -live_opt([{label,Fail}=I1, - {func_info,_,_,Live}=I2|Is]) -> +live_opt(Is0) -> + {[{label,Fail}|_]=Bef,[Fi|Is]} = + splitwith(fun({func_info,_,_,_}) -> false; + (_) -> true + end, Is0), + {func_info,_,_,Live} = Fi, D = gb_trees:insert(Fail, live_call(Live), gb_trees:empty()), - [I1,I2|live_opt(reverse(Is), 0, D, [])]. + Bef ++ [Fi|live_opt(reverse(Is), 0, D, [])]. %% delete_live_annos([Instruction]) -> [Instruction]. @@ -470,8 +474,15 @@ check_liveness(R, [{make_fun2,_,_,_,NumFree}|Is], St) -> end; check_liveness(R, [{try_end,Y}|Is], St) -> case R of - Y -> {killed,St}; - _ -> check_liveness(R, Is, St) + Y -> + {killed,St}; + {y,_} -> + %% y registers will be used if an exception occurs and + %% control transfers to the label given in the previous + %% try/2 instruction. + {used,St}; + _ -> + check_liveness(R, Is, St) end; check_liveness(R, [{catch_end,Y}|Is], St) -> case R of @@ -499,6 +510,8 @@ check_liveness(R, [{loop_rec,{f,_},{x,0}}|_], St) -> end; 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, Is, St) when is_list(Is) -> %% case Is of %% [I|_] -> @@ -799,6 +812,8 @@ live_opt([{wait,_}=I|Is], Regs, D, Acc) -> live_opt(Is, Regs, D, [I|Acc]); live_opt([{wait_timeout,_,{Tag,_}}=I|Is], Regs, D, Acc) when Tag =/= x -> live_opt(Is, Regs, D, [I|Acc]); +live_opt([{line,_}=I|Is], Regs, D, Acc) -> + live_opt(Is, Regs, D, [I|Acc]); %% The following instructions can occur if the "compilation" has been %% started from a .S file using the 'asm' option. |