drgn 0.0.19 Feature-wise, this release mainly adds more helpers, including Linux slab helpers and new "validator" helpers. Internally, a lot of work was done to improve testing. New features: - Helpers for the Linux kernel slab allocator were added (`slab_cache_is_merged()`, `for_each_slab_cache()`, `find_slab_cache()`, `print_slab_caches()`, and `slab_cache_for_each_allocated_object()` in `drgn.helpers.linux.slab`). Contributed by Alex Zhu. - The concept of "validators", special helpers which validate a data structure, was introduced. - Validators for linked lists were added (`validate_list()`, `validate_list_for_each()`, and `validate_list_for_each_entry()` in `drgn.helpers.list`). - Validators for red-black trees were added (`validate_rbtree()` and `validate_rbtree_inorder_for_each_entry()` in `drgn.helpers.linux.rbtree`). - The `drgn.helpers.linux.rbtree.RB_EMPTY_ROOT()` helper was added. - The i386, AArch64, Arm, and RISC-V architectures are now recognized and were added to `Architecture`. (Architecture-specific features have not been implemented for those architectures yet.) - Support for integer reference objects larger than 64 bits was added (values are still not implemented). Contributed by Jay Kamat. Bug fixes: - `Program.crashed_thread()` was fixed when debugging a non-SMP Linux kernel. - A bug in 32-bit builds that could cause poor performance due to hash collisions was fixed. Other improvements: - Linux kernel support was tested up to v5.18-rc7. - Applying ELF relocations (used for kernel modules) was optimized for ppc64, i386, AArch64, Arm, and RISC-V. - Documentation for `StackFrame.name` was expanded. Internal: - The virtual machine testing setup was expanded to test on kernels using all three Linux kernel slab allocator implementations (SLUB, SLAB, SLOB) and both SMP and !SMP. - The virtual machine testing setup was also expanded to use a custom kernel module to test helpers that couldn't previously be tested. - Flake8 was added to the pre-commit configuration.