NoVarDynamicScope could be more singletonized, to reduce scoping costs for
no-var methods to zero
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Key: JRUBY-2783
URL: http://jira.codehaus.org/browse/JRUBY-2783
Project: JRuby
Issue Type: Bug
Components: Performance
Reporter: Charles Oliver Nutter
Currently any method or closure bodies that have no variables will use a
NoVarDynamicScope, which does not allocate any space for variables. However, it
still allocates space for itself and for standard DynamicScope fields, when it
will never be used. We should try to eliminate it.
The primary concerns to address when eliminating it are:
* DynamicScope is used for cref access, used for constant resolution, etc
* A NoVar scope in a block must still be constructed to hold a reference to the
parent scope
So this is primarily an optimization applicable to root scopes like class
bodies and methods.
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