Please review this change that makes AccessFlags and modifier_flags u2 types
and removes the last remnants of Hotspot adding internal access flags. This
change moves AccessFlags and modifier_flags in Klass to alignment gaps saving
16 bytes. From pahole: so it's a bit better.
before:
/* size: 216, cachelines: 4, members: 25, static members: 17 */
/* sum members: 194, holes: 3, sum holes: 18 */
after:
/* size: 200, cachelines: 4, members: 25, static members: 17 */
/* sum members: 188, holes: 4, sum holes: 12 */
We may eventually move the modifiers to java.lang.Class but that's WIP.
Tested with tier1-7 on oracle platforms. Did test builds on other platforms
(please try these changes ppc/arm32 and s390). Also requires minor Graal
changes.
-------------
Commit messages:
- Remove JVM_ACC_WRITTEN_FLAGS because they are all written in the classfile
now.
- 8339113: AccessFlags can be u2 in metadata
Changes: https://git.openjdk.org/jdk/pull/22246/files
Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22246&range=00
Issue: https://bugs.openjdk.org/browse/JDK-8339113
Stats: 167 lines in 41 files changed: 16 ins; 40 del; 111 mod
Patch: https://git.openjdk.org/jdk/pull/22246.diff
Fetch: git fetch https://git.openjdk.org/jdk.git pull/22246/head:pull/22246
PR: https://git.openjdk.org/jdk/pull/22246
