Bug ID: JDK-6939861 JVM should handle more conversion operations

JDK-6939861 : JVM should handle more conversion operations

Type: Bug
Component: hotspot
Sub-Component: compiler
Affected Version: hs20,hs21,7

Priority: P3
Status: Closed
Resolution: Fixed
OS: generic
CPU: generic

Submitted: 2010-03-31
Updated: 2020-07-20
Resolved: 2011-07-18

Versions (Unresolved/Resolved/Fixed)

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Resolved: Release in which this issue/RFE has been resolved.
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JDK 7	Other
7Fixed	hs21Fixed

Related Reports

Duplicate :	JDK-7035515 - JSR 292: livelock after "init_AdapterMethodHandle should not issue this" message
Duplicate :	JDK-7018894 - JSR 292 method handle collector transform does not work correctly on subtypes of Object[]
Duplicate :	JDK-7016250 - JSR 292 Raw retypes and return type conversions are needed
Duplicate :	JDK-6829188 - missing method handle adapters required for JSR 292
Duplicate :	JDK-7035517 - JSR 292: NYI at java.lang.invoke.SpreadGeneric.buildAdapterFromBytecodes(SpreadGeneric.java:199)
Duplicate :	JDK-7035513 - JSR 292: MHs.constant() doesn't accept primitives
Duplicate :	JDK-7039220 - MethodHandle.asCollector throws UnsupportedOperationException if arrayLength >= 10
Duplicate :	JDK-7035516 - JSR 292: NYI: primitive parameters must follow references
Relates :	JDK-6983728 - JSR 292 code for limited argument counts is unused and should be deleted
Relates :	JDK-7045514 - SPARC assembly code for JSR 292 ricochet frames
Relates :	JDK-8249697 - remove temporary fixes from java/lang/invoke/RicochetTest.java
Relates :	JDK-7111138 - delete the obsolete flag -XX:+UseRicochetFrames
Relates :	JDK-7032850 - MethodHandle.invokeGeneric throws unspecified RuntimeException if parameterized method is called

Description

The reference implementation of JSR 292 uses specially coded assembly stubs to perform common low-level calling sequence adapations.  Some are not yet implemented, with their semantics being emulated (sometimes with limitations) by lots of little Java adapter classes.  This leads to Java code complexity and limitations on argument counts.

The following still need to be implemented:

OP_PRIM_TO_REF : requires a stack frame if the boxing operation must block
OP_SPREAD_ARGS : requires a stack overflow check
OP_RICOCHET, OP_FLYBY : both require a stack frame to hold arguments for the final MH

Comments

EVALUATION yes

14-09-2010