RFR: 8354887: Preserve runtime blobs in AOT code cache [v2]

[Vladimir Kozlov]

On Mon, 5 May 2025 21:13:24 GMT, Ashutosh Mehra <asmehra at openjdk.org> wrote:

>> [8350209](https://bugs.openjdk.org/browse/JDK-8350209) introduced the framework for storing code in aot code cache and used it for caching i2c/c2i adapters.
>> This PR extends the `AOTCodeCache` infrastructure and stores various runtime blobs (shared blobs, C1 and C2 runtime blobs) in the AOT code cache. It adds a new diagnostic flag `AOTStubCaching` to enable/disable the caching of these blobs.
>> `AOTCodeFlags.java` test is extended to cover `AOTStubCaching`.
>
> Ashutosh Mehra has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 11 commits:
> 
>  - Merge branch 'master' into preserve-runtime-blobs-master
>  - Address Vladimir's comments
>    
>    Signed-off-by: Ashutosh Mehra <asmehra at redhat.com>
>  - Remove irrelevant comment
>    
>    Signed-off-by: Ashutosh Mehra <asmehra at redhat.com>
>  - Fix win64 compile failures
>    
>    Signed-off-by: Ashutosh Mehra <asmehra at redhat.com>
>  - Fix AOTCodeFlags.java test
>    
>    Signed-off-by: Ashutosh Mehra <asmehra at redhat.com>
>  - Fix compile failure in minimal config
>    
>    Signed-off-by: Ashutosh Mehra <asmehra at redhat.com>
>  - Revert back changes that added AOTRuntimeConstants.
>    Ensure CompressedOops::base and CompressedKlssPointers::base does not
>    change in production run
>    
>    Signed-off-by: Ashutosh Mehra <asmehra at redhat.com>
>  - Fix merge conflicts
>    
>    Signed-off-by: Ashutosh Mehra <asmehra at redhat.com>
>  - Store/load AsmRemarks and DbgStrings in aot code cache
>    
>    Signed-off-by: Ashutosh Mehra <asmehra at redhat.com>
>  - Add missing external address in aarch64
>    
>    Signed-off-by: Ashutosh Mehra <asmehra at redhat.com>
>  - ... and 1 more: https://git.openjdk.org/jdk/compare/2a4f37cc...ba612dab

Test `runtime/cds/appcds/aotClassLinking/MethodHandleTest.java` crashed on linux-aarch64:


#
# A fatal error has been detected by the Java Runtime Environment:
#
#  SIGSEGV (0xb) at pc=0x0000ffffb4df1f84, pid=3645763, tid=3645766
#
# JRE version: Java(TM) SE Runtime Environment (25.0) (fastdebug build 25-internal-LTS-2025-05-05-2218263.vladimir.kozlov.jdkgit2)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (fastdebug 25-internal-LTS-2025-05-05-2218263.vladimir.kozlov.jdkgit2, mixed mode, sharing, tiered, compressed oops, compressed class ptrs, g1 gc, linux-aarch64)
# Problematic frame:
# v  ~RuntimeStub::Shared Runtime throw_NullPointerException_at_call_blob 0x0000ffff73dd2db0

-------------

PR Comment: https://git.openjdk.org/jdk/pull/25019#issuecomment-2852738551