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authorBjörn Gustavsson <bjorn@erlang.org>2011-12-29 12:18:41 +0100
committerBjörn Gustavsson <bjorn@erlang.org>2012-01-11 08:39:56 +0100
commit85f789f22ce07112be08354417b4179ee23427c7 (patch)
tree71e9bd3bd5db36ac302f75ffa2dffb91b7e9beb8 /lib
parenta900b67a1f67fcd982a0aa16452b477c3ac4e264 (diff)
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sys_core_fold: Simplify opt_bool_not() to cover it completely
In: case not Expr of ... we don't have the information to ascertain that Expr is a boolean expression. Therefore, add the catch-all clause unconditionally.
Diffstat (limited to 'lib')
-rw-r--r--lib/compiler/src/sys_core_fold.erl26
1 files changed, 8 insertions, 18 deletions
diff --git a/lib/compiler/src/sys_core_fold.erl b/lib/compiler/src/sys_core_fold.erl
index 4347ec2a61..620b4e8847 100644
--- a/lib/compiler/src/sys_core_fold.erl
+++ b/lib/compiler/src/sys_core_fold.erl
@@ -1747,36 +1747,26 @@ opt_bool_clauses([_|_], _, _) ->
%% end. NewVar ->
%% erlang:error(badarg)
%% end.
-%%
-%% We add the extra match-all clause at the end only if Expr is
-%% not guaranteed to evaluate to a boolean.
opt_bool_not(#c_case{arg=Arg,clauses=Cs0}=Case0) ->
case Arg of
#c_call{anno=Anno,module=#c_literal{val=erlang},
name=#c_literal{val='not'},
args=[Expr]} ->
- Cs = opt_bool_not(Anno, Expr, Cs0),
+ Cs = [opt_bool_not_invert(C) || C <- Cs0] ++
+ [#c_clause{anno=[compiler_generated],
+ pats=[#c_var{name=cor_variable}],
+ guard=#c_literal{val=true},
+ body=#c_call{anno=Anno,
+ module=#c_literal{val=erlang},
+ name=#c_literal{val=error},
+ args=[#c_literal{val=badarg}]}}],
Case = Case0#c_case{arg=Expr,clauses=Cs},
opt_bool_not(Case);
_ ->
opt_bool_case_redundant(Case0)
end.
-opt_bool_not(Anno, Expr, Cs) ->
- Tail = case is_bool_expr(Expr) of
- false ->
- [#c_clause{anno=[compiler_generated],
- pats=[#c_var{name=cor_variable}],
- guard=#c_literal{val=true},
- body=#c_call{anno=Anno,
- module=#c_literal{val=erlang},
- name=#c_literal{val=error},
- args=[#c_literal{val=badarg}]}}];
- true -> []
- end,
- [opt_bool_not_invert(C) || C <- Cs] ++ Tail.
-
opt_bool_not_invert(#c_clause{pats=[#c_literal{val=Bool}]}=C) ->
C#c_clause{pats=[#c_literal{val=not Bool}]}.