Bug ID: JDK-8329332 Remove CompiledMethod and CodeBlobLayout classes

JDK-8329332 : Remove CompiledMethod and CodeBlobLayout classes

Type: Enhancement
Component: hotspot
Sub-Component: compiler
Affected Version: 23

Priority: P4
Status: Resolved
Resolution: Fixed

Submitted: 2024-03-29
Updated: 2024-05-03
Resolved: 2024-04-04

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JDK 23
23 b18Fixed

Related Reports

Blocks :	JDK-8329629 - GC interfaces should work directly against nmethod instead of CodeBlob
Relates :	JDK-8329433 - Reduce nmethod header size
Relates :	JDK-8329628 - Additional changes after JDK-8329332
Relates :	JDK-8152664 - Support non-continuous CodeBlobs in HotSpot
Relates :	JDK-8323344 - Remove unused `nmethod::_scopes_data_offset`
Relates :	JDK-8329629 - GC interfaces should work directly against nmethod instead of CodeBlob

Description

Undo JDK-8152664 changes [1] which was used for AOT JEP [2] implementation in JDK 9.  The code was left in HotSpot assuming  it will help in a future. But during work on Leyden for the past year we decided to not use it - cached compiled code will be restored in CodeCache as normal nmethods  (no need to change VM's runtime and GC code to process them).

I propose to revert JDK-8152664 change and remove CompiledMethod and CodeBlobLayout classes to simplify `nmethod` class hierarchy.

[1] https://github.com/openjdk/jdk/commit/b853eb7f5ca24eeeda18acbb14287f706499c365
[2] https://openjdk.org/jeps/295

Comments

Changeset: 83eba863 Author: Vladimir Kozlov <kvn@openjdk.org> Date: 2024-04-04 19:48:48 +0000 URL: https://git.openjdk.org/jdk/commit/83eba863fec5ee7e30c4f9b11122ad1deed3d2ec

04-04-2024

A pull request was submitted for review. URL: https://git.openjdk.org/jdk/pull/18554 Date: 2024-03-29 19:35:45 +0000

30-03-2024