8265411: Avoid unnecessary Method::init_intrinsic_id calls

[iklam]

check_methods_for_intrinsics() in classFileParser.cpp calls Method::klass_id_for_intrinsics() to see if a class has intrinsic methods. However, the latter returns any class whose name is included in vmSymbols. This causes many unnecessary calls to Method::init_intrinsic_id().

To fix this, we precompute the classes that are known to have intrinsics using constexpr. See vmIntrinsics::class_has_intrinsics.

After the fix, when running java -Xshare:off -version, the number of classes initialized for intrinsics is reduced from 130 to 30.

Testing: mach5 tiers 1~4 passed.

---

Progress

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Issue

• JDK-8265411: Avoid unnecessary Method::init_intrinsic_id calls

Reviewers

• David Holmes (@dholmes-ora - Reviewer) ⚠️ Review applies to eb8e0bf
• Yumin Qi (@yminqi - Reviewer) ⚠️ Review applies to eb8e0bf

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[mlbridge]

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• 01: Full - Incremental (f4857a66)
• 00: Full (eb8e0bf6)

[dholmes-ora]

Hi Ioi,

That all appears fine to me.

Is there any startup impact?

Thanks,
David

[openjdk]

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8265411: Avoid unnecessary Method::init_intrinsic_id calls

Reviewed-by: dholmes, minqi

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[iklam]

Hi Ioi,

That all appears fine to me.

Is there any startup impact?

Thanks,
David

Hi David, when CDS is turned off, I can see a small improvement in start-up, due to the reduction in intrinsic ID lookup:

$ perf stat -r 100 bin/java -Xshare:off -Xint -version

OLD: 191,632,128 cycles 0.074624 sec
NEW: 191,387,603 cycles 0.073704 sec

With CDS enabled, the intrinsic ID lookup is done during archive dump time, so this PR makes no difference.

Also, the lookup table itself is generated during C++ compilation, so it has no runtime impact:

	.section	.rodata
	.type	_ZL18_intrinsics_lookup, @object
_ZL18_intrinsics_lookup:
	.byte	0
	.byte	0
	.byte	1
	.byte	1
        ....

[yminqi]

LGTM, thanks for fixing this!

[yminqi]

BTW, the the fix works for the problem: adding symbols to vmSymbols.hpp caused debug build failed due to this bug.

[iklam]

Thanks @dholmes-ora and @yminqi for the review!
/integrate

[openjdk]

@iklam Since your change was applied there have been 15 commits pushed to the master branch:

• a22ad03: 8264983: Add gtest for JDK-8264008
• 91b08b7: 8261779: JCK test api/javax_crypto/EncryptedPrivateKeyInfo/Ctor4.html is failing with assertion error when assertions enabled
• 2fcd920: 8261183: Follow on to Make lists of normal filenames
• 40ef00c: 8258457: testlibrary_tests/ctw/JarDirTest.java fails with InvalidPathException on windows
• 3f0da35: 8261392: Exclude testlibrary_tests/ctw/JarDirTest.java
• 8d0faaf: 8257001: Improve Http Client Support
• 9bf055d: 8259633: compiler/graalunit/CoreTest.java fails with NPE after JDK-8244543
• ddc56d1: 8259428: AlgorithmId.getEncodedParams() should return copy
• ae33d2a: 8258247: Couple of issues in fix for JDK-8249906
• 2003e91: 8244543: Enhanced handling of abstract classes
• ... and 5 more: https://git.openjdk.java.net/jdk/compare/d61345984d56cc46161ffea097afbd899081f3cf...master

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