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authorBjörn Gustavsson <[email protected]>2015-02-27 12:17:05 +0100
committerBjörn Gustavsson <[email protected]>2015-03-09 09:41:18 +0100
commitc5e808c27beeef8cfc5eaa4ab37aeaaaef3db849 (patch)
treec662a184ce3d83c0ec478fb250848302d2b18c7d /lib/compiler/src
parent09dfc3ba50174c55733b11db70d444f62b029302 (diff)
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v3_core: Add is_map tests before map instructions
If we have a sequence of put_map_* instructions operating on the same map, it will be more efficient if we can have one is_map/2 instruction before put_map_* instructions, so that each put_map_* does not need to test whether the argument is a map.
Diffstat (limited to 'lib/compiler/src')
-rw-r--r--lib/compiler/src/sys_core_fold.erl14
-rw-r--r--lib/compiler/src/v3_core.erl38
-rw-r--r--lib/compiler/src/v3_kernel.erl30
3 files changed, 36 insertions, 46 deletions
diff --git a/lib/compiler/src/sys_core_fold.erl b/lib/compiler/src/sys_core_fold.erl
index 2618f7adba..ea1959d0f8 100644
--- a/lib/compiler/src/sys_core_fold.erl
+++ b/lib/compiler/src/sys_core_fold.erl
@@ -1603,6 +1603,7 @@ eval_case(#c_case{arg=E,clauses=[#c_clause{pats=Ps0,
%% is correct, the clause will always match at run-time.
Case;
{true,Bs} ->
+ eval_case_warn(B),
{Ps,As} = unzip(Bs),
InnerLet = cerl:c_let(Ps, core_lib:make_values(As), B),
Let = cerl:c_let(Vs, E, InnerLet),
@@ -1610,6 +1611,19 @@ eval_case(#c_case{arg=E,clauses=[#c_clause{pats=Ps0,
end;
eval_case(Case, _) -> Case.
+eval_case_warn(#c_primop{anno=Anno,
+ name=#c_literal{val=match_fail},
+ args=[#c_literal{val=Reason}]}=Core)
+ when is_atom(Reason) ->
+ case member(eval_failure, Anno) of
+ false ->
+ ok;
+ true ->
+ %% Example: M = not_map, M#{k:=v}
+ add_warning(Core, {eval_failure,Reason})
+ end;
+eval_case_warn(_) -> ok.
+
%% case_opt(CaseArg, [Clause]) -> {CaseArg,[Clause]}.
%% Try and optimise a case by avoid building tuples or lists
%% in the case expression. Instead combine the variable parts
diff --git a/lib/compiler/src/v3_core.erl b/lib/compiler/src/v3_core.erl
index 9478dc9579..cd44fb459b 100644
--- a/lib/compiler/src/v3_core.erl
+++ b/lib/compiler/src/v3_core.erl
@@ -758,30 +758,28 @@ make_bool_switch_guard(L, E, V, T, F) ->
{clause,NegL,[V],[],[V]}
]}.
-expr_map(M0,Es0,A,St0) ->
- {M1,Mps,St1} = safe(M0, St0),
+expr_map(M0, Es0, A, St0) ->
+ {M1,Eps0,St1} = safe(M0, St0),
case is_valid_map_src(M1) of
true ->
- case {M1,Es0} of
- {#c_var{}, []} ->
- %% transform M#{} to is_map(M)
- {Vpat,St2} = new_var(St1),
- {Fpat,St3} = new_var(St2),
- Cs = [#iclause{
- anno=A,
- pats=[Vpat],
- guard=[#icall{anno=#a{anno=A},
+ {M2,Eps1,St2} = map_build_pairs(M1, Es0, A, St1),
+ M3 = case Es0 of
+ [] -> M1;
+ [_|_] -> M2
+ end,
+ Cs = [#iclause{
+ anno=#a{anno=[compiler_generated|A]},
+ pats=[],
+ guard=[#icall{anno=#a{anno=A},
module=#c_literal{anno=A,val=erlang},
name=#c_literal{anno=A,val=is_map},
- args=[Vpat]}],
- body=[Vpat]}],
- Fc = fail_clause([Fpat], A, #c_literal{val=badarg}),
- {#icase{anno=#a{anno=A},args=[M1],clauses=Cs,fc=Fc},Mps,St3};
- {_,_} ->
- {M2,Eps,St2} = map_build_pairs(M1, Es0, A, St1),
- {M2,Mps++Eps,St2}
- end;
- false -> throw({bad_map,bad_map})
+ args=[M1]}],
+ body=[M3]}],
+ Fc = fail_clause([], [eval_failure|A], #c_literal{val=badarg}),
+ Eps = Eps0 ++ Eps1,
+ {#icase{anno=#a{anno=A},args=[],clauses=Cs,fc=Fc},Eps,St2};
+ false ->
+ throw({bad_map,bad_map})
end.
map_build_pairs(Map, Es0, Ann, St0) ->
diff --git a/lib/compiler/src/v3_kernel.erl b/lib/compiler/src/v3_kernel.erl
index 08e84efc1b..0ac1aaf158 100644
--- a/lib/compiler/src/v3_kernel.erl
+++ b/lib/compiler/src/v3_kernel.erl
@@ -273,17 +273,7 @@ expr(#c_tuple{anno=A,es=Ces}, Sub, St0) ->
{Kes,Ep,St1} = atomic_list(Ces, Sub, St0),
{#k_tuple{anno=A,es=Kes},Ep,St1};
expr(#c_map{anno=A,arg=Var,es=Ces}, Sub, St0) ->
- try expr_map(A,Var,Ces,Sub,St0) of
- {_,_,_}=Res -> Res
- catch
- throw:bad_map ->
- St1 = add_warning(get_line(A), bad_map, A, St0),
- Erl = #c_literal{val=erlang},
- Name = #c_literal{val=error},
- Args = [#c_literal{val=badarg}],
- Error = #c_call{anno=A,module=Erl,name=Name,args=Args},
- expr(Error, Sub, St1)
- end;
+ expr_map(A, Var, Ces, Sub, St0);
expr(#c_binary{anno=A,segments=Cv}, Sub, St0) ->
try atomic_bin(Cv, Sub, St0) of
{Kv,Ep,St1} ->
@@ -506,19 +496,9 @@ translate_fc(Args) ->
[#c_literal{val=function_clause},make_list(Args)].
expr_map(A,Var0,Ces,Sub,St0) ->
- %% An extra pass of validation of Map src because of inlining
{Var,Mps,St1} = expr(Var0, Sub, St0),
- case is_valid_map_src(Var) of
- true ->
- {Km,Eps,St2} = map_split_pairs(A, Var, Ces, Sub, St1),
- {Km,Eps++Mps,St2};
- false -> throw(bad_map)
- end.
-
-is_valid_map_src(#k_map{}) -> true;
-is_valid_map_src(#k_literal{val=M}) when is_map(M) -> true;
-is_valid_map_src(#k_var{}) -> true;
-is_valid_map_src(_) -> false.
+ {Km,Eps,St2} = map_split_pairs(A, Var, Ces, Sub, St1),
+ {Km,Eps++Mps,St2}.
map_split_pairs(A, Var, Ces, Sub, St0) ->
%% 1. Force variables.
@@ -2024,9 +2004,7 @@ format_error(nomatch_shadow) ->
format_error(bad_call) ->
"invalid module and/or function name; this call will always fail";
format_error(bad_segment_size) ->
- "binary construction will fail because of a type mismatch";
-format_error(bad_map) ->
- "map construction will fail because of a type mismatch".
+ "binary construction will fail because of a type mismatch".
add_warning(none, Term, Anno, #kern{ws=Ws}=St) ->
File = get_file(Anno),