From e9c343d551779c975f075ae812ef8cd7ae0a1d64 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Bj=C3=B6rn=20Gustavsson?= Date: Tue, 4 Oct 2016 15:11:05 +0200 Subject: sys_core_fold: Eliminate complaint from core_lint --- lib/compiler/src/sys_core_fold.erl | 22 ++++++++++++++++------ lib/compiler/test/core_fold_SUITE.erl | 20 ++++++++++++++++++-- lib/compiler/test/warnings_SUITE.erl | 1 - 3 files changed, 34 insertions(+), 9 deletions(-) diff --git a/lib/compiler/src/sys_core_fold.erl b/lib/compiler/src/sys_core_fold.erl index 44a6aa425d..7c233b323b 100644 --- a/lib/compiler/src/sys_core_fold.erl +++ b/lib/compiler/src/sys_core_fold.erl @@ -172,13 +172,23 @@ guard(Expr, Sub) -> %% opt_guard_try(#c_seq{arg=Arg,body=Body0}=Seq) -> Body = opt_guard_try(Body0), - case {Arg,Body} of - {#c_call{module=#c_literal{val=Mod}, - name=#c_literal{val=Name}, - args=Args},#c_literal{val=false}} -> + WillFail = case Body of + #c_call{module=#c_literal{val=erlang}, + name=#c_literal{val=error}, + args=[_]} -> + true; + #c_literal{val=false} -> + true; + _ -> + false + end, + case Arg of + #c_call{module=#c_literal{val=Mod}, + name=#c_literal{val=Name}, + args=Args} when WillFail -> %% We have sequence consisting of a call (evaluated %% for a possible exception and/or side effect only), - %% followed by 'false'. + %% followed by 'false' or a call to error/1. %% Since the sequence is inside a try block that will %% default to 'false' if any exception occurs, not %% evalutating the call will not change the behaviour @@ -193,7 +203,7 @@ opt_guard_try(#c_seq{arg=Arg,body=Body0}=Seq) -> %% be safely removed. Body end; - {_,_} -> + _ -> Seq#c_seq{body=Body} end; opt_guard_try(#c_case{clauses=Cs}=Term) -> diff --git a/lib/compiler/test/core_fold_SUITE.erl b/lib/compiler/test/core_fold_SUITE.erl index ced0e39d06..0097e28d4d 100644 --- a/lib/compiler/test/core_fold_SUITE.erl +++ b/lib/compiler/test/core_fold_SUITE.erl @@ -26,7 +26,7 @@ unused_multiple_values_error/1,unused_multiple_values/1, multiple_aliases/1,redundant_boolean_clauses/1, mixed_matching_clauses/1,unnecessary_building/1, - no_no_file/1,configuration/1]). + no_no_file/1,configuration/1,supplies/1]). -export([foo/0,foo/1,foo/2,foo/3]). @@ -45,7 +45,7 @@ groups() -> unused_multiple_values_error,unused_multiple_values, multiple_aliases,redundant_boolean_clauses, mixed_matching_clauses,unnecessary_building, - no_no_file,configuration]}]. + no_no_file,configuration,supplies]}]. init_per_suite(Config) -> @@ -511,4 +511,20 @@ configuration() -> art() -> creating. +%% core_lint would complain after optimization. A call to error/1 +%% must not occur unconditionally in a guard. +supplies(_Config) -> + case ?MODULE of + core_fold_inline_SUITE -> + %% Other error behaviour when inlined. + ok; + _ -> + {'EXIT',{function_clause,_}} = (catch do_supplies(#{1 => <<1,2,3>>})), + {'EXIT',{function_clause,_}} = (catch do_supplies(#{1 => a})), + {'EXIT',{function_clause,_}} = (catch do_supplies(42)), + ok + end. + +do_supplies(#{1 := Value}) when byte_size(Value), byte_size(kg) -> working. + id(I) -> I. diff --git a/lib/compiler/test/warnings_SUITE.erl b/lib/compiler/test/warnings_SUITE.erl index f884e6e7d6..35f7db82bd 100644 --- a/lib/compiler/test/warnings_SUITE.erl +++ b/lib/compiler/test/warnings_SUITE.erl @@ -281,7 +281,6 @@ bad_arith(Config) when is_list(Config) -> {3,sys_core_fold,{eval_failure,badarith}}, {9,sys_core_fold,nomatch_guard}, {9,sys_core_fold,{eval_failure,badarith}}, - {9,sys_core_fold,{no_effect,{erlang,is_integer,1}}}, {10,sys_core_fold,nomatch_guard}, {10,sys_core_fold,{eval_failure,badarith}}, {15,sys_core_fold,{eval_failure,badarith}} -- cgit v1.2.3 From 456ba65161d9228a2562d32bd25b0a15c90011b8 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Bj=C3=B6rn=20Gustavsson?= Date: Wed, 26 Oct 2016 12:58:38 +0200 Subject: sys_core_fold: Use less effort optimizing not in lets There are two calls opt_not_in_let(). Since 05130e4855 introduced iteration to a fixpoint, only the first call is needed. Removing the redundant call will slightly speed up compilation. --- lib/compiler/src/sys_core_fold.erl | 23 +++++++---------------- 1 file changed, 7 insertions(+), 16 deletions(-) diff --git a/lib/compiler/src/sys_core_fold.erl b/lib/compiler/src/sys_core_fold.erl index 7c233b323b..5d7fd37270 100644 --- a/lib/compiler/src/sys_core_fold.erl +++ b/lib/compiler/src/sys_core_fold.erl @@ -2151,7 +2151,7 @@ letify(Bs, Body) -> -spec opt_not_in_let(cerl:c_let()) -> cerl:cerl(). opt_not_in_let(#c_let{vars=[_]=Vs0,arg=Arg0,body=Body0}=Let) -> - case opt_not_in_let(Vs0, Arg0, Body0) of + case opt_not_in_let_0(Vs0, Arg0, Body0) of {[],#c_values{es=[]},Body} -> Body; {Vs,Arg,Body} -> @@ -2159,13 +2159,7 @@ opt_not_in_let(#c_let{vars=[_]=Vs0,arg=Arg0,body=Body0}=Let) -> end; opt_not_in_let(Let) -> Let. -%% opt_not_in_let(Vs, Arg, Body) -> {Vs',Arg',Body'} -%% Try to optimize away a 'not' operator in a 'let'. - --spec opt_not_in_let([cerl:c_var()], cerl:cerl(), cerl:cerl()) -> - {[cerl:c_var()],cerl:cerl(),cerl:cerl()}. - -opt_not_in_let([#c_var{name=V}]=Vs0, Arg0, Body0) -> +opt_not_in_let_0([#c_var{name=V}]=Vs0, Arg0, Body0) -> case cerl:type(Body0) of call -> %% let = Expr in not V ==> @@ -2196,9 +2190,7 @@ opt_not_in_let([#c_var{name=V}]=Vs0, Arg0, Body0) -> end; _ -> {Vs0,Arg0,Body0} - end; -opt_not_in_let(Vs, Arg, Body) -> - {Vs,Arg,Body}. + end. opt_not_in_let_1(V, Call, Body) -> case Call of @@ -2652,11 +2644,10 @@ opt_simple_let_0(#c_let{arg=Arg0}=Let, Ctxt, Sub) -> opt_simple_let_1(#c_let{vars=Vs0,body=B0}=Let, Arg0, Ctxt, Sub0) -> %% Optimise let and add new substitutions. - {Vs1,Args,Sub1} = let_substs(Vs0, Arg0, Sub0), - BodySub = update_let_types(Vs1, Args, Sub1), - B1 = body(B0, Ctxt, BodySub), - Arg1 = core_lib:make_values(Args), - {Vs,Arg,B} = opt_not_in_let(Vs1, Arg1, B1), + {Vs,Args,Sub1} = let_substs(Vs0, Arg0, Sub0), + BodySub = update_let_types(Vs, Args, Sub1), + B = body(B0, Ctxt, BodySub), + Arg = core_lib:make_values(Args), opt_simple_let_2(Let, Vs, Arg, B, B0, Ctxt, Sub1). opt_simple_let_2(Let0, Vs0, Arg0, Body, PrevBody, Ctxt, Sub) -> -- cgit v1.2.3