On Thu, 17 Jul 2025 22:38:48 GMT, Ioi Lam <[email protected]> wrote: > This PR loads the classes for the boot/platform/app loaders with > `AOTLinkedClassBulkLoader::preload_classes()`. This happens at the very > beginning of `vmClasses::resolve_all()`, before any Java code is executed. > > - We essentially iterate over all the classes inside the > `AOTLinkedClassTable` and adds them into the system dictionary using the new > method `SystemDictionary::preload_class()`. > - `SystemDictionary::preload_class(..., k)` is lightweight because it's > called in a single thread after all super types of `k` have been loaded. So > most of the complicated work (such as place holders, circularity detection, > etc) in `SystemDictionary::resolve_or_null(..., k)` can be skipped. We also > don't need to call into `ClassLoader::load_class()` as the boot/platform/app > loaders are well-behaved. > - In the assembly phase, we record the mirror, package, protection domain, > code source, etc, of these classes. So there's no need to programmatically > create them in the production run. See `HeapShared::copy_java_mirror()` and > also changes in ClassLoader.java and SecureClassLoader.java.
This pull request has now been integrated. Changeset: fd30ae98 Author: Ioi Lam <[email protected]> URL: https://git.openjdk.org/jdk/commit/fd30ae988bc512b5d2a5a3fd1bc1ed351af974c7 Stats: 941 lines in 43 files changed: 534 ins; 236 del; 171 mod 8350550: Preload classes from AOT cache during VM bootstrap Reviewed-by: kvn, heidinga, asmehra ------------- PR: https://git.openjdk.org/jdk/pull/26375
