[erlang-patches] Optimize handling of local fun variables in v3_kernel
Anthony Ramine
n.oxyde@REDACTED
Tue Jan 15 11:39:38 CET 2013
Hi Fredrik,
I can't find any modules nor on_load cases in cover_SUITE.
Regards,
--
Anthony Ramine
Le 15 janv. 2013 à 10:42, Fredrik a écrit :
> After further research we can see that the patch is also failing these testcases in tools,
> cover_SUITE, modules
> cover_SUITE, on_load
>
> Please fix this and give me notice,
>
> BR Fredrik Gustafsson
> Erlang OTP Team
> On 01/10/2013 01:33 PM, Anthony Ramine wrote:
>> Le 9 janv. 2013 à 17:32, Björn Gustavsson a écrit :
>>
>>> The code handles free variables. As far as I can understand, there
>>> can be no free variables in this case, so you should simplify the code.
>> You're right and wrong :) There can be no free variables if the Core Erlang
>> code comes from a current Erlang module, but there can be if the Core Erlang
>> was handwritten or generated by my EEP37 patch, for example:
>>
>> module 'foo' ['bar'/1,
>> 'module_info'/0,
>> 'module_info'/1]
>> attributes []
>> 'bar'/1 =
>> %% Line 4
>> fun (_cor0) ->
>> letrec
>> 'Bar'/1 =
>> %% Line 5
>> ( fun (_cor4) ->
>> let<Bar> = 'Bar'/1
>> in case _cor4 of
>> <1> when 'true' ->
>> 1
>> <N> when 'true' ->
>> let<_cor3> =
>> call 'erlang':'*'
>> (N, _cor0)
>> in let<_cor1> =
>> call 'erlang':'-'
>> (N, 1)
>> in let<_cor2> =
>> apply Bar
>> (_cor1)
>> in call 'erlang':'*'
>> (_cor3, _cor2)
>> end
>> -| [{'id',{0,0,'Bar'}}] )
>> in 'Bar'/1
>> 'module_info'/0 =
>> fun () ->
>> call 'erlang':'get_module_info'
>> ('foo')
>> 'module_info'/1 =
>> fun (_cor0) ->
>> call 'erlang':'get_module_info'
>> ('foo', _cor0)
>> end
>>
>> In 'bar'/1, _cor0 is a free variable inside 'Bar'/1; thus free variables need
>> to be handled to remove the reverse eta conversion in a future-proof way.
>>
>> The differences between master and my patch when running erlc +to_kernel foo.core
>> are:
>>
>> --- foo.kernel.orig 2013-01-10 13:27:28.000000000 +0100
>> +++ foo.kernel 2013-01-10 13:27:36.000000000 +0100
>> @@ -5,18 +5,16 @@
>> attributes []
>> fdef 'bar'/1(_Xcor0) =
>> do
>> - bif (internal 'make_fun'/4)('-bar/1-anonymous-2-', 2, 0, 0, _Xcor0)>> <_ker2>
>> + bif (internal 'make_fun'/4)('-bar/1-Bar/1-0-', 2, 0, 0, _Xcor0)>> <_ker1>
>> then
>> -<<_ker2>>
>> +<<_ker1>>
>> fdef 'module_info'/0() =
>> enter (remote 'erlang':'get_module_info'/1)('foo')
>> fdef 'module_info'/1(_Xcor0) =
>> enter (remote 'erlang':'get_module_info'/2)('foo', _Xcor0)
>> -fdef '-bar/1-anonymous-2-'/2(_ker0, _Xcor0) =
>> - enter (local '-bar/1-Bar/1-0-'/2)(_ker0, _Xcor0)
>> fdef '-bar/1-Bar/1-0-'/2(_Xcor4, _Xcor0) =
>> do
>> - bif (internal 'make_fun'/4)('-bar/1-anonymous-1-', 2, 0, 0, _Xcor0)>> <Bar>
>> + bif (internal 'make_fun'/4)('-bar/1-Bar/1-0-', 2, 0, 0, _Xcor0)>> <Bar>
>> then
>> match _Xcor4
>> alt
>> @@ -34,10 +32,8 @@
>> call (Bar)(_Xcor1)>> <_Xcor2>
>> then
>> do
>> - bif (remote 'erlang':'*'/2)(_Xcor3, _Xcor2)>> <_ker1>
>> + bif (remote 'erlang':'*'/2)(_Xcor3, _Xcor2)>> <_ker0>
>> then
>> -<<_ker1>>
>> +<<_ker0>>
>> end>> <>
>> -fdef '-bar/1-anonymous-1-'/2(V1, _Xcor0) =
>> - enter (local '-bar/1-Bar/1-0-'/2)(V1, _Xcor0)
>> end
>> \ No newline at end of file
>>
>> Fredrik, I'll fix the failing test cases from trace_local_SUITE and come back to you
>> when I'm done. Thanks for the feedback.
>>
>> Regards,
>>
>
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