[erlang-patches] [erlang-bugs] Compiler crash with 'inline_list_funcs' and "fun Fun/Arity" notation
Anthony Ramine
n.oxyde@REDACTED
Mon Jul 1 19:08:04 CEST 2013
Hello Björn,
I've amended my commit, please refetch.
Regards,
--
Anthony Ramine
Le 26 juin 2013 à 14:52, Anthony Ramine a écrit :
> Will amend.
>
> --
> Anthony Ramine
>
> Le 26 juin 2013 à 14:43, Björn Gustavsson a écrit :
>
>> Thanks! Looks good. I have only two slight comments:
>>
>> If find the first sentence in the commit message confusing:
>>
>> "Local fun references look like plain old variables in the Core Erlang
>> AST and should not be treated as such."
>>
>> I would suggest "but" instead of "and":
>>
>> "Local fun references look like plain old variables in the Core Erlang
>> AST, but should not be treated as such."
>>
>> The test cases tests that the compiler does not crash and that
>> the code can be loaded, but it does not test that the code actually
>> works. I suggest that you rewrite it to something like this:
>>
>> ?MODULE() ->
>> F = fun bar/1,
>> G = lists:last([(fun (X) when F =:= X -> X end)]),
>> F = G(F),
>> ok.
>>
>> bar(X) ->
>> X.
>>
>> /Bjorn
>>
>>
>>
>> On Sat, May 18, 2013 at 6:22 PM, Anthony Ramine <n.oxyde@REDACTED> wrote:
>> Hello,
>>
>> This patch fixes the bug by forbidding inlining of variables which values are local fun references outside of application contexts.
>>
>> git fetch https://github.com/nox/otp.git fix-fname-inlining
>>
>> https://github.com/nox/otp/compare/erlang:maint...fix-fname-inlining
>> https://github.com/nox/otp/compare/erlang:maint...fix-fname-inlining.patch
>>
>> Regards,
>>
>> --
>> Anthony Ramine
>>
>> Le 17 mai 2013 à 20:06, Anthony Ramine a écrit :
>>
>>> Hello,
>>>
>>> Shorter test case, showing the problem comes from the inline itself and not inline_list_funcs:
>>>
>>> -module(test).
>>> -compile(inline).
>>> -export([foo/0]).
>>>
>>> foo() ->
>>> F = fun bar/1,
>>> fun (X) when X =:= F -> X end.
>>>
>>> bar(X) -> X.
>>>
>>> If you run the core_lint pass, you can see where the problem comes from:
>>>
>>> $ erlc +clint test.erl
>>> test: illegal guard expression in foo/0
>>>
>>> The inliner inlines `when 'erlang':'=:='(X, F)` to `'erlang':'=:='(X, 'bar'/1)` but local fun references can't appear in guards.
>>>
>>> I'll try to make a patch.
>>>
>>> Regards,
>>>
>>> --
>>> Anthony Ramine
>>>
>>> Le 17 mai 2013 à 10:55, Masatake Daimon a écrit :
>>>
>>>> Hello,
>>>>
>>>> Compiling the following module makes the compiler crash. I'm using
>>>> R16B.
>>>>
>>>> ===== test.erl =====
>>>> -module(test).
>>>> -compile(inline).
>>>> -compile(inline_list_funcs).
>>>> -export([foo/0]).
>>>>
>>>> foo() ->
>>>> lists:map(fun bar/1, [1]).
>>>>
>>>> bar(X) -> X.
>>>>
>>>> ===== the crash ====
>>>> % erlc test.erl
>>>> test: function '-foo/0-lists^map/1-0-'/1+15:
>>>> Internal consistency check failed - please report this bug.
>>>> Instruction: {move,{x,0},{yy,0}}
>>>> Error: {invalid_store,{yy,0},term}:
>>>>
>>>>
>>>> Note that the problem disappears with any of these changes:
>>>>
>>>> * Commenting out "-compile(inline)."
>>>> * Commenting out "-compile(inline_list_funcs)."
>>>> * Changing the definition of foo/0 to:
>>>> foo() ->
>>>> lists:map(fun bar/1, []). % [] instead of [1]
>>>> * Changing the definition of foo/0 to:
>>>> foo() ->
>>>> lists:map(fun (A) -> bar(A) end, [1]).
>>>>
>>>> Regards,
>>>> --
>>>> 大門 正岳 <daimon@REDACTED>
>>>> _______________________________________________
>>>> erlang-bugs mailing list
>>>> erlang-bugs@REDACTED
>>>> http://erlang.org/mailman/listinfo/erlang-bugs
>>>
>>
>> _______________________________________________
>> erlang-bugs mailing list
>> erlang-bugs@REDACTED
>> http://erlang.org/mailman/listinfo/erlang-bugs
>>
>>
>>
>> --
>> Björn Gustavsson, Erlang/OTP, Ericsson AB
>
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