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Add loop operator in fcode #889

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zxq9 wants to merge 27 commits from loop-op into master
pull from: loop-op
merge into: QPQ-AG:master
Conversation 3 Commits 27 Files Changed 2 +10 -4
1 changed files with 10 additions and 4 deletions
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Showing only changes of commit cf7830e4f5 - Show all commits

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src/aeso_fcode_to_fate.erl
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@ -819,6 +819,9 @@ ann_live(LiveTop, [I | Is], LiveOut) ->
ann_live1(_LiveTop, switch_body, LiveOut) ->
Ann = #{ live_in => LiveOut, live_out => LiveOut },
{{i, Ann, switch_body}, LiveOut};
ann_live1(LiveTop, {jump, Ref}, _LiveOut) ->
Ann = #{ live_in => LiveTop, live_out => [] },
{{i, Ann, {jump, Ref}}, LiveTop};
ann_live1(LiveTop, loop, _LiveOut) ->
Ann = #{ live_in => LiveTop, live_out => [] },
{{i, Ann, loop}, LiveTop};
@ -1104,6 +1107,8 @@ simplify([I | Code], Options) ->
simpl_s({switch, Arg, Type, Alts, Def}, Options) ->
{switch, Arg, Type, [simplify(A, Options) || A <- Alts], simplify(Def, Options)};
simpl_s({loop, Init, Var, Expr, ContRef, BreakRef}, Options) ->
{loop, simplify(Init, Options), Var, simplify(Expr, Options), ContRef, BreakRef};
simpl_s(I, _) -> I.
%% Safe-guard against loops in the rewriting. Shouldn't happen so throw an
@ -1705,7 +1710,6 @@ optimize_blocks(Blocks) ->
Rev = fun(Bs) -> [ {Ref, lists:reverse(Code)} || {Ref, Code} <- Bs ] end,
RBlocks = [{Ref, crop_jumps(Code)} || {Ref, Code} <- Blocks],
RBlockMap = maps:from_list(RBlocks),
io:format("REORDERING ~p\n\n", [RBlocks]),
RBlocks1 = reorder_blocks(RBlocks, []),
RBlocks2 = [ {Ref, inline_block(RBlockMap, Ref, Code)} || {Ref, Code} <- RBlocks1 ],
RBlocks3 = shortcut_jump_chains(RBlocks2),
@ -1786,13 +1790,15 @@ tweak_returns(['RETURN' | Code = [{'EXIT', _} | _]]) -> Code;
tweak_returns(['RETURN' | Code = [loop | _]]) -> Code;
tweak_returns(Code) -> Code.
%% Remove instructions that appear after jumps. Returns reversed code.
%% -- Remove instructions that appear after jumps. Returns reversed code.
%% This is useful for example when bb emitter adds continuation jumps
%% for switch expressions, but some of the branches
crop_jumps(Code) ->
crop_jumps(Code, []).
crop_jumps([], Acc) ->
Acc;
crop_jumps([I = {jump, _}|_], Acc) ->
[I|Acc];
%% crop_jumps([I = {jump, _}|_], Acc) ->
%% [I|Acc];
crop_jumps([I|Code], Acc) ->
crop_jumps(Code, [I|Acc]).