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New reify classes #4648

merged 7 commits into from May 17, 2018

New reify classes #4648

merged 7 commits into from May 17, 2018


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@headius headius commented Jun 7, 2017

Work to unify variable and structural reification of Ruby classes. See #4643.

The goal here is to start splitting off the method reification,
which many (most) people don't need, so we can still get the
benefit of generating a real class for every custom Ruby class
without the hassle of binding a bunch of methods.

See #4643.
This is a first step toward unifying all forms of reification.

In this commit, all the hand-implemented RubyObjectVar* and
ObjectAllocator* are instead generated as needed and then reused
statically. Since this will be a bounded number of classes (based
on the max size of inspected instance vars in user classes) it
should not use too much memory.

This now allows us to support reified instance variable fields up
to an arbitrary size.

Note that although the allocators are generated on a per-class
basis (necessary without using MethodHandle for allocation) the
variable accessors are still hand-written and only call the
appropriate getVariable# or setVariable# up to 9 as before. It is
an open TODO to generate these accessors on a per-class basis so
they inline all the way through. The alternative would be moving
toward more MethodHandle-based factories, but that limits
cross-JVM support and may result in startup impact.

For #4643 among others.
@headius headius added this to the JRuby milestone Jun 7, 2017

if (allocator != null) return allocator;

final String clsPath = "org/jruby/specialize/RubyObject" + size;
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there's org/jruby/gen to distinguish generated code, maybe it makes sense to use it as well (org.jruby.gen.specialize)?

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I agree this generated code should go into org.jruby.gen. The "org.jruby.specialize" was a typo on my part; it would have been specialized, which I think we will keep to separate the hand-written pieces from the generated stuff.

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ivoanjo commented Sep 9, 2017

I've just retried with this branch with the following testcase (from #4643)

class BrokenReify
  def to_s


And it still causes a stack overflow. I believe the reason why it fails is still similar: it's because unlike other reification options (e.g. reify variables) we define the instance methods from the ruby class in the reified class, which is what breaks code which tries to call super.

I'm not sure what the is best choice here:

@headius headius merged commit 39a76a3 into master May 17, 2018
@headius headius deleted the new_reify_classes branch June 28, 2018 22:58
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3 participants