Skip to content

8329750: Change Universe functions to return more specific Klass* types #18652

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Closed
wants to merge 3 commits into from
Closed

8329750: Change Universe functions to return more specific Klass* types #18652

Changes from 1 commit
Commits
Show all changes
3 commits
Select commit Hold shift + click to select a range
fc2a4a9
8329750: Change Universe functions to return more specific Klass* types
stefank Apr 5, 2024
d36f650
Update src/hotspot/share/classfile/systemDictionary.cpp
stefank Apr 8, 2024
36bef54
Revert "Update src/hotspot/share/classfile/systemDictionary.cpp "
stefank Apr 8, 2024
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
3 changes: 1 addition & 2 deletions src/hotspot/share/classfile/systemDictionary.cpp
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -367,8 +367,7 @@ Klass* SystemDictionary::resolve_array_class_or_null(Symbol* class_name,
k = k->array_klass(ndims, CHECK_NULL);
}
} else {
TypeArrayKlass* tak = Universe::typeArrayKlass(t);
k = tak->array_klass(ndims, CHECK_NULL);
k = Universe::typeArrayKlass(t);
k = k->array_klass(ndims, CHECK_NULL);
Copy link
Contributor

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

this looks puzzling. Why are there two array_klass calls now? Add short comments to explain.

Copy link
Contributor

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

I sort of see now but am getting squint lines. It's not important for performance to eliminate a virtual call here.

Copy link
Member Author

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Hmm. Having two array_klass calls were not intentional. I accepted Dean's suggestion in the GitHub UI, but that didn't remove the old array_klass. I think I'll revert that change given that it is not important to devirtualize this.

Copy link
Contributor

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Oh good because I was going to need a lot more coffee to understand why there was a second call. Thanks.

Copy link
Member

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Why devirtualize elsehwere but not here? Maybe it's not a big deal.

Copy link
Member

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Or to put it another way, what's the advantage of using TypeArrayKlass* tak in similar situations below?

}
return k;
Expand Down