diff options
Diffstat (limited to 'lib/compiler/src/beam_validator.erl')
| -rw-r--r-- | lib/compiler/src/beam_validator.erl | 20 |
1 files changed, 15 insertions, 5 deletions
diff --git a/lib/compiler/src/beam_validator.erl b/lib/compiler/src/beam_validator.erl index 58250b1314..349d74eb58 100644 --- a/lib/compiler/src/beam_validator.erl +++ b/lib/compiler/src/beam_validator.erl @@ -1068,8 +1068,11 @@ verify_get_map(Fail, Src, List, Vst0) -> %% {get_map_elements,{f,7},{x,1},{list,[{atom,a},{x,1},{atom,b},{x,2}]}}. %% %% If 'a' exists but not 'b', {x,1} is overwritten when we jump to {f,7}. +%% +%% We must be careful to preserve the uninitialized status for Y registers +%% that have been allocated but not yet defined. clobber_map_vals([Key,Dst|T], Map, Vst0) -> - case is_reg_defined(Dst, Vst0) of + case is_reg_initialized(Dst, Vst0) of true -> Vst = extract_term(term, {bif,map_get}, [Key, Map], Dst, Vst0), clobber_map_vals(T, Map, Vst); @@ -1079,6 +1082,17 @@ clobber_map_vals([Key,Dst|T], Map, Vst0) -> clobber_map_vals([], _Map, Vst) -> Vst. +is_reg_initialized({x,_}=Reg, #vst{current=#st{xs=Xs}}) -> + is_map_key(Reg, Xs); +is_reg_initialized({y,_}=Reg, #vst{current=#st{ys=Ys}}) -> + case Ys of + #{Reg:=Val} -> + Val =/= uninitialized; + #{} -> + false + end; +is_reg_initialized(V, #vst{}) -> error({not_a_register, V}). + extract_map_keys([Key,_Val|T]) -> [Key|extract_map_keys(T)]; extract_map_keys([]) -> []. @@ -1874,10 +1888,6 @@ check_try_catch_tags(Type, {y,N}=Reg, Vst) -> ok end. -is_reg_defined({x,_}=Reg, #vst{current=#st{xs=Xs}}) -> is_map_key(Reg, Xs); -is_reg_defined({y,_}=Reg, #vst{current=#st{ys=Ys}}) -> is_map_key(Reg, Ys); -is_reg_defined(V, #vst{}) -> error({not_a_register, V}). - assert_term(Src, Vst) -> _ = get_term_type(Src, Vst), ok. |