Constructing a transient singleton class should hold the receiver until complete
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Key: JRUBY-1769
URL: http://jira.codehaus.org/browse/JRUBY-1769
Project: JRuby
Issue Type: Bug
Components: Compiler
Reporter: Charles Oliver Nutter
Assignee: Charles Oliver Nutter
Fix For: JRuby 1.1
This is a compile issue relating to the new weakref-based "attached" in a
singleton class. The following code:
{noformat}
class << Object.new; def foo; end; end
{noformat}
...can sometimes fail because the new object, referenced only via the
"attached" weakref in the new singleton class, may GC before the def is
encountered. Because def on a singleton class calls additional methods on the
object, this causes a NPE.
The fix is to make sure that in all cases, when constructing a singleton class,
the compiler keeps the referenced object hard-referenced until the class
definition is complete. The implication is that in such an unusual case, the
lifetime of the object could only reasonably be the lifetime of the class body.
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