8373210: Move ThreadLocalRandom managed fields to carrier thread

[AlanBateman]

Work in progress, ignore for now.

---

Progress

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Issue

• JDK-8373210: Move ThreadLocalRandom managed fields to carrier thread (Enhancement - P4)

Reviewing

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$ git fetch https://git.openjdk.org/jdk.git pull/28687/head:pull/28687
$ git checkout pull/28687

Update a local copy of the PR:
$ git checkout pull/28687
$ git pull https://git.openjdk.org/jdk.git pull/28687/head

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$ git pr checkout 28687

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https://git.openjdk.org/jdk/pull/28687.diff

[bridgekeeper]

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[openjdk]

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See the Progress checklist in the description for automated requirements.

[openjdk]

@AlanBateman The following labels will be automatically applied to this pull request:

• core-libs
• security

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[AlanBateman]

/label remove security

[openjdk]

@AlanBateman
The security label was successfully removed.

[ExE-Boss]

@Stable is not needed for non‑array final fields in java.lang, as all final instance fields are trusted for constant folding (except for the write protected I⁠/⁠O stream fields in java.lang.System):

jdk/src/hotspot/share/ci/ciField.cpp

Lines 216 to 225 in 3500150

	static bool trust_final_non_static_fields(ciInstanceKlass* holder) {
	if (holder == nullptr)
	return false;
	// Even if general trusting is disabled, trust system-built closures in these packages.
	if (holder->is_in_package("java/lang/invoke") || holder->is_in_package("sun/invoke") ||
	holder->is_in_package("java/lang/reflect") || holder->is_in_package("jdk/internal/reflect") ||
	holder->is_in_package("jdk/internal/foreign/layout") || holder->is_in_package("jdk/internal/foreign") ||
	holder->is_in_package("jdk/internal/vm/vector") || holder->is_in_package("jdk/incubator/vector") ||
	holder->is_in_package("java/lang"))
	return true;

[ExE-Boss]

Suggested change

	@Stable private final FieldHolder holder;
	private final FieldHolder holder;

[AlanBateman]

@Stable is not needed for non‑array final fields in java.lang, as all final instance fields are trusted for constant folding (except for the write protected I⁠/⁠O stream fields in java.lang.System):

We know. This is one of a many different prototypes, maybe I should close this PR as it is not meant to commented/reviewed at this time.