RFR: 8347830: [premain] UseCompatibleCompressedOops is broken after merging with mainline
Vladimir Kozlov
kvn at openjdk.org
Fri May 16 02:38:46 UTC 2025
The issue was that we did not allocate space "noaccess prefix" before heap for read-only page when we setup type of encoding with `UseCompatibleCompressedOops` flag. I update code which reserves heap for compressed oops to take into account this flag.
An other issue was that `UseCompatibleCompressedOops` flag was set during CDS arguments consistency checkup. But `UseCompressedOops` flag is set by GC ergonomics. I moved code to CDS ergonomics setting method.
During testing I hit assert that AOT code address table is missing some code blob address. But it was actually card table base address which pointed inside CodeCache. I added special case to check for it early.
Tested premain-tier1.
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Commit messages:
- 8347830: [premain] UseCompatibleCompressedOops is broken after merging with mainline
Changes: https://git.openjdk.org/leyden/pull/67/files
Webrev: https://webrevs.openjdk.org/?repo=leyden&pr=67&range=00
Issue: https://bugs.openjdk.org/browse/JDK-8347830
Stats: 62 lines in 3 files changed: 40 ins; 16 del; 6 mod
Patch: https://git.openjdk.org/leyden/pull/67.diff
Fetch: git fetch https://git.openjdk.org/leyden.git pull/67/head:pull/67
PR: https://git.openjdk.org/leyden/pull/67
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