'is cached' routines break when precompiled

[p6rt]

Migrated from rt.perl.org#122896 (status was 'open')

Searchable as RT122896$

[p6rt]

From @raydiak

Create a module M containing "module M { sub f () is cached is export { } }". When precompiled, the following error occurs when f() is called​:

Cannot invoke null object
  in block at src/gen/m-CORE.setting​:3604
  in any enter at src/gen/m-Metamodel.nqp​:3110
  in method invoke at src/gen/m-CORE.setting​:3548

This is perl6 version 2014.09-81-g89abcf2 built on MoarVM version 2014.09-12-gb9e24ee

[p6rt]

From @dwarring

Test case has been added to S10-packages/precompilation.t. Fudged
for jvm and moar.

On Fri Oct 03 17​:41​:15 2014, raydiak@​cyberuniverses.com wrote​:

Create a module M containing "module M { sub f () is cached is export
{ } }". When precompiled, the following error occurs when f() is
called​:

Cannot invoke null object
in block at src/gen/m-CORE.setting​:3604
in any enter at src/gen/m-Metamodel.nqp​:3110
in method invoke at src/gen/m-CORE.setting​:3548

This is perl6 version 2014.09-81-g89abcf2 built on MoarVM version
2014.09-12-gb9e24ee

[p6rt]

The RT System itself - Status changed from 'new' to 'open'

[p6rt]

From @lizmat

On 04 Oct 2014, at 02​:41, (via RT) <perl6-bugs-followup@​perl.org> wrote​:

# New Ticket Created by
# Please include the string​: [perl #​122896]
# in the subject line of all future correspondence about this issue.
# <URL​: https://rt-archive.perl.org/perl6/Ticket/Display.html?id=122896 >

Create a module M containing "module M { sub f () is cached is export { } }". When precompiled, the following error occurs when f() is called​:

Cannot invoke null object
in block at src/gen/m-CORE.setting​:3604
in any enter at src/gen/m-Metamodel.nqp​:3110
in method invoke at src/gen/m-CORE.setting​:3548

This is perl6 version 2014.09-81-g89abcf2 built on MoarVM version 2014.09-12-gb9e24ee

At least on OS X, this has now changed to a segfault on Moar, easily reproducible thus​:

$ perl6 -e 'CompUnit.new("t/spec/packages/Example/C.pm").precomp’
$ perl6 -It/spec/packages -e ‘use Example​::C; f()’
Segmentation fault​: 11

Liz

[p6rt]

From @bdw

Which backend is that? I'm assuming moar.

2015-01-08 10​:14 GMT+01​:00 Elizabeth Mattijsen <liz@​dijkmat.nl>​:

On 04 Oct 2014, at 02​:41, (via RT) <perl6-bugs-followup@​perl.org> wrote​:

# New Ticket Created by
# Please include the string​: [perl #​122896]
# in the subject line of all future correspondence about this issue.
# <URL​: https://rt-archive.perl.org/perl6/Ticket/Display.html?id=122896 >

Create a module M containing "module M { sub f () is cached is export {
} }". When precompiled, the following error occurs when f() is called​:

Cannot invoke null object
in block at src/gen/m-CORE.setting​:3604
in any enter at src/gen/m-Metamodel.nqp​:3110
in method invoke at src/gen/m-CORE.setting​:3548

This is perl6 version 2014.09-81-g89abcf2 built on MoarVM version
2014.09-12-gb9e24ee

At least on OS X, this has now changed to a segfault on Moar, easily
reproducible thus​:

$ perl6 -e 'CompUnit.new("t/spec/packages/Example/C.pm").precomp’
$ perl6 -It/spec/packages -e ‘use Example​::C; f()’
Segmentation fault​: 11

Liz

[p6rt]

From @lizmat

Moar :-)

On 08 Jan 2015, at 10​:16, Bart Wiegmans <bartwiegmans@​gmail.com> wrote​:

Which backend is that? I'm assuming moar.

2015-01-08 10​:14 GMT+01​:00 Elizabeth Mattijsen <liz@​dijkmat.nl>​:

On 04 Oct 2014, at 02​:41, (via RT) <perl6-bugs-followup@​perl.org> wrote​:

# New Ticket Created by
# Please include the string​: [perl #​122896]
# in the subject line of all future correspondence about this issue.
# <URL​: https://rt-archive.perl.org/perl6/Ticket/Display.html?id=122896 >

Create a module M containing "module M { sub f () is cached is export { } }". When precompiled, the following error occurs when f() is called​:

Cannot invoke null object
in block at src/gen/m-CORE.setting​:3604
in any enter at src/gen/m-Metamodel.nqp​:3110
in method invoke at src/gen/m-CORE.setting​:3548

This is perl6 version 2014.09-81-g89abcf2 built on MoarVM version 2014.09-12-gb9e24ee

At least on OS X, this has now changed to a segfault on Moar, easily reproducible thus​:

$ perl6 -e 'CompUnit.new("t/spec/packages/Example/C.pm").precomp’
$ perl6 -It/spec/packages -e ‘use Example​::C; f()’
Segmentation fault​: 11

Liz

[p6rt]

From @lizmat

On 08 Jan 2015, at 10​:16, Bart Wiegmans <bartwiegmans@​gmail.com> wrote​:

Which backend is that? I'm assuming moar.

2015-01-08 10​:14 GMT+01​:00 Elizabeth Mattijsen <liz@​dijkmat.nl>​:

On 04 Oct 2014, at 02​:41, (via RT) <perl6-bugs-followup@​perl.org> wrote​:

# New Ticket Created by
# Please include the string​: [perl #​122896]
# in the subject line of all future correspondence about this issue.
# <URL​: https://rt-archive.perl.org/perl6/Ticket/Display.html?id=122896 >

Create a module M containing "module M { sub f () is cached is export { } }". When precompiled, the following error occurs when f() is called​:

Cannot invoke null object
in block at src/gen/m-CORE.setting​:3604
in any enter at src/gen/m-Metamodel.nqp​:3110
in method invoke at src/gen/m-CORE.setting​:3548

This is perl6 version 2014.09-81-g89abcf2 built on MoarVM version 2014.09-12-gb9e24ee

At least on OS X, this has now changed to a segfault on Moar, easily reproducible thus​:

$ perl6 -e 'CompUnit.new("t/spec/packages/Example/C.pm").precomp’
$ perl6 -It/spec/packages -e ‘use Example​::C; f()’
Segmentation fault​: 11

I further golfed this down to​:

multi sub trait_mod​:<is>(Routine $r, :$foo!) {
  $r.wrap(-> |c {
  });
}
sub a is foo { say "a" };
a

Put this in a file with a .pm extension, precomp it like above, and try to load it.

Liz

[p6rt]

From @lizmat

On 08 Jan 2015, at 13​:36, Elizabeth Mattijsen <liz@​dijkmat.nl> wrote​:
I further golfed this down to​:

multi sub trait_mod​:<is>(Routine $r, :$foo!) {
$r.wrap(-> |c {
});
}
sub a is foo { say "a" };
a

Put this in a file with a .pm extension, precomp it like above, and try to load it.

By making the block completely parameterless, it gives a stack trace

Cannot invoke null object
  at A.pm​:2 (/Users/liz/Github/rakudo.moar/A.pm.moarvm​::17)
from src/gen/m-Metamodel.nqp​:3185 (blib/Perl6/Metamodel.moarvm​:enter​:28)

that brings us to​:

  src/Perl6/Metamodel/Dispatchers.nqp

line 101​:

  method enter(*@​pos, *%named) {
  my $fresh := nqp​::clone(self);
  my $first := self.candidates[0];
  nqp​::setdispatcher($fresh);
  $first(|@​pos, |%named) # <— $first is not set
  }

So it would appear that we cannot find a candidate to be dispatched to. Perhaps the original sub is not serialized???

Liz