On Thu, 17 Apr 2025 00:08:55 GMT, Chen Liang <li...@openjdk.org> wrote:
> The downcallHandle method in Linker has a complex implementation, and type > switches is triggered in multiple places in that handle. > > After bytestacks analysis of a simple program that links the native > implementation of Class::forName0, it turns out that: > 1. there are a few missed usages of type switch in ClassFile API > 2. type switch can speed up generation by using explicit stack maps, as stack > map gen is over 50% of the generation instructions because the switch is > branch-heavy, but the frames are actually simple. > > These two combined are not that significant in the overall overhead of > downcallHandle, but would be helpful for other workloads. Both parts of this PR look good to me, however they seem to be unrelated. I would suggest to create another PR for #1, as the Class-File API JDK boot safety is not related to the SUBJ. ------------- PR Comment: https://git.openjdk.org/jdk/pull/24705#issuecomment-2820507514
