Bug ID: JDK-8338542 Umbrella - Reduce startup overhead associated with migration to ClassFile API

JDK-8338542 : Umbrella - Reduce startup overhead associated with migration to ClassFile API

Type: Enhancement
Component: core-libs
Sub-Component: java.lang.classfile
Affected Version: 24

Priority: P2
Status: Resolved
Resolution: Delivered

Submitted: 2024-08-19
Updated: 2024-10-24
Resolved: 2024-10-24

Versions (Unresolved/Resolved/Fixed)

The Version table provides details related to the release that this issue/RFE will be addressed.

Unresolved : Release in which this issue/RFE will be addressed.
Resolved: Release in which this issue/RFE has been resolved.
Fixed : Release in which this issue/RFE has been fixed. The release containing this fix may be available for download as an Early Access Release or a General Availability Release.

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JDK 24
24Resolved

Related Reports

Duplicate :	JDK-8338820 - Small startup regression after JDK-8294960
Relates :	JDK-8294960 - Convert java.base/java.lang.invoke package to use the Classfile API to generate lambdas and method handles
Relates :	JDK-8338937 - Optimize the string concatenation of ClassDesc
Relates :	JDK-8339492 - StackMapDecoder::writeFrames makes lots of allocations
Relates :	JDK-8338532 - Speed up the ClassFile API MethodTypeDesc#ofDescriptor

Sub Tasks

JDK-8338543 :	ClassBuilder withMethod builders should cache the method type symbol - Resolved
JDK-8338544 :	Dedicated Array class descriptor implementation - Resolved
JDK-8338545 :	Functional interface implementations for common pre-boot ClassFile operations - Resolved
JDK-8338546 :	Speed up ConstantPoolBuilder::classEntry(ClassDesc) - Resolved
JDK-8338547 :	Sharing of singleton instructions in ClassFile building - Closed
JDK-8338979 :	Avoid bootstrapped switches in the classfile API - Resolved
JDK-8339132 :	Make DirectCodeBuilder write through without allocating instruction objects - Resolved
JDK-8339167 :	Remove AbstractPoolEntry.PrimitiveEntry to reduce boxing overheads - Resolved
JDK-8339168 :	Optimize ClassFile Util slotSize - Resolved
JDK-8339196 :	Optimize BufWriterImpl#writeU1/U2/Int/Long - Resolved
JDK-8339198 :	Remove tag field from AbstractPoolEntry - Resolved
JDK-8339205 :	Optimize StackMapGenerator - Resolved
JDK-8339290 :	Optimize ClassFile Utf8EntryImpl#writeTo - Resolved
JDK-8339320 :	Optimize ClassFile Utf8EntryImpl#inflate - Resolved
JDK-8339519 :	Remove size field from instructions - Resolved
JDK-8339576 :	Speed up raw bytecode processing in ClassFile API - Resolved
JDK-8339642 :	Reduce overheads in InvokerBytecodeGenerator - Resolved
JDK-8339683 :	Simplify class data generation in InvokerBytecodeGenerator - Resolved
JDK-8339710 :	Avoid initializing AccessFlag related classes in write-only cases - Resolved
JDK-8339742 :	Refactor ClassFileImpl to allow loading Option classes lazily - Resolved
JDK-8339799 :	Reduce work done in j.l.invoke bytecode generators - Resolved
JDK-8339800 :	Prefer invokeBasic in BootstrapMethodInvokers - Resolved
JDK-8339875 :	MethodTypeDesc to reuse descriptor string from MethodType - Closed
JDK-8339876 :	Move constant symbol caches to Utf8EntryImpl - Resolved
JDK-8340011 :	Simplify jdk.internal.classfile.impl.EntryMap - Resolved
JDK-8340131 :	Refactor internal makeHiddenClassDefiner to take option mask instead of Set - Resolved
JDK-8340544 :	Optimize setLocalsFromArg - Resolved
JDK-8340587 :	Optimize StackMapGenerator$Frame::checkAssignableTo - Resolved
JDK-8340708 :	Optimize StackMapGenerator::processMethod - Resolved
JDK-8340710 :	Optimize DirectClassBuilder::build - Resolved
JDK-8340831 :	Simplify simple validation for class definition in MethodHandles.Lookup - Resolved
JDK-8341006 :	Optimize StackMapGenerator detect frames - Resolved
JDK-8341136 :	Optimize StackMapGenerator::trimAndCompress - Resolved
JDK-8341141 :	Optimize DirectCodeBuilder - Resolved
JDK-8341199 :	Use ClassFile's new API loadConstant(int) - Resolved
JDK-8341415 :	Optimize RawBytecodeHelper::next - Resolved
JDK-8341510 :	Optimize StackMapGenerator::processFieldInstructions - Resolved
JDK-8341512 :	Optimize StackMapGenerator::processInvokeInstructions - Resolved
JDK-8341581 :	Optimize BytecodeHelpers validate slot - Resolved
JDK-8341859 :	Optimize ClassFile Benchmark Write - Resolved
JDK-8341900 :	Optimize DirectCodeBuilder writeBody - Resolved
JDK-8341906 :	Optimize ClassFile writing BufBuffer - Resolved

Description

This is an umbrella task for reducing startup overhead associated with migration of java.lang.invoke package to ClassFile API since 24-b2. Concrete action items will be in the subtasks.

- Integrate stack counting (and maybe frames) into DCB like in ASM

Comments

The startup issue should have been resolved. JDK-8342620 is about peak performance, so the performance issue replicated with jruby is tracked there.

24-10-2024

[~shade] What is the state of this regression on b15? It's back to b2 level for some startup benchmarks, but many optimizations are made in java.lang.invoke meaning that there's still work to do for ClassFile API.

17-09-2024