diff options
Diffstat (limited to 'lib/compiler')
| -rw-r--r-- | lib/compiler/src/beam_type.erl | 27 | ||||
| -rw-r--r-- | lib/compiler/test/guard_SUITE.erl | 12 |
2 files changed, 26 insertions, 13 deletions
diff --git a/lib/compiler/src/beam_type.erl b/lib/compiler/src/beam_type.erl index 8dd6e5f1c6..26c933481a 100644 --- a/lib/compiler/src/beam_type.erl +++ b/lib/compiler/src/beam_type.erl @@ -329,27 +329,27 @@ build_alloc(Words, Floats) -> {alloc,[{words,Words},{floats,Floats}]}. %% flt_liveness([Instruction]) -> [Instruction] %% (Re)calculate the number of live registers for each heap allocation -%% function. We base liveness of the number of live registers at -%% entry to the instruction sequence. +%% function. We base liveness of the number of register map at the +%% beginning of the instruction sequence. %% %% A 'not_possible' term will be thrown if the set of live registers %% is not continous at an allocation function (e.g. if {x,0} and {x,2} %% are live, but not {x,1}). -flt_liveness([{'%live',Live,_}=LiveInstr|Is]) -> - flt_liveness_1(Is, init_regs(Live), [LiveInstr]). +flt_liveness([{'%live',_Live,Regs}=LiveInstr|Is]) -> + flt_liveness_1(Is, Regs, [LiveInstr]). -flt_liveness_1([{set,Ds,Ss,{alloc,_,Alloc}}|Is], Regs0, Acc) -> - Live = live_regs(Regs0), +flt_liveness_1([{set,Ds,Ss,{alloc,Live0,Alloc}}|Is], Regs0, Acc) -> + Live = min(Live0, live_regs(Regs0)), I = {set,Ds,Ss,{alloc,Live,Alloc}}, - Regs = foldl(fun(R, A) -> set_live(R, A) end, Regs0, Ds), + Regs1 = init_regs(Live), + Regs = x_live(Ds, Regs1), flt_liveness_1(Is, Regs, [I|Acc]); flt_liveness_1([{set,Ds,_,_}=I|Is], Regs0, Acc) -> - Regs = foldl(fun(R, A) -> set_live(R, A) end, Regs0, Ds), + Regs = x_live(Ds, Regs0), flt_liveness_1(Is, Regs, [I|Acc]); -flt_liveness_1([{'%live',_,_}=I|Is], Regs, Acc) -> - flt_liveness_1(Is, Regs, [I|Acc]); -flt_liveness_1([], _Regs, Acc) -> reverse(Acc). +flt_liveness_1([{'%live',_,_}], _Regs, Acc) -> + reverse(Acc). init_regs(Live) -> (1 bsl Live) - 1. @@ -364,8 +364,9 @@ live_regs_1(R, N) -> 1 -> live_regs_1(R bsr 1, N+1) end. -set_live({x,X}, Regs) -> Regs bor (1 bsl X); -set_live(_, Regs) -> Regs. +x_live([{x,N}|Rs], Regs) -> x_live(Rs, Regs bor (1 bsl N)); +x_live([_|Rs], Regs) -> x_live(Rs, Regs); +x_live([], Regs) -> Regs. %% update(Instruction, TypeDb) -> NewTypeDb %% Update the type database to account for executing an instruction. diff --git a/lib/compiler/test/guard_SUITE.erl b/lib/compiler/test/guard_SUITE.erl index 8db47ffa40..08279d9408 100644 --- a/lib/compiler/test/guard_SUITE.erl +++ b/lib/compiler/test/guard_SUITE.erl @@ -1802,6 +1802,12 @@ bad_guards(Config) when is_list(Config) -> fc(catch bad_guards_2(#{a=>0,b=>0}, [x])), fc(catch bad_guards_2(not_a_map, [x])), fc(catch bad_guards_2(42, [x])), + + fc(catch bad_guards_3(#{a=>0,b=>0}, [])), + fc(catch bad_guards_3(#{a=>0,b=>0}, [x])), + fc(catch bad_guards_3(not_a_map, [x])), + fc(catch bad_guards_3(42, [x])), + ok. %% beam_bool used to produce GC BIF instructions whose @@ -1813,6 +1819,12 @@ bad_guards_1(X, [_]) when {{X}}, -X -> bad_guards_2(M, [_]) when M#{a := 0, b => 0}, map_size(M) -> ok. +%% beam_type used to produce an GC BIF instruction whose Live operand +%% included uninitialized registers. + +bad_guards_3(M, [_]) when is_map(M) andalso M#{a := 0, b => 0}, length(M) -> + ok. + %% Call this function to turn off constant propagation. id(I) -> I. |