RFR: 8377554: Load card table base and other values via AOTRuntimeConstants in AOT code [v5]

[Andrew Dinn]

On Wed, 25 Feb 2026 01:33:06 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

>> Andrew Dinn has updated the pull request incrementally with four additional commits since the last revision:
>> 
>>  - rename card tabel field and load it correctly
>>  - use correct load and remove redudnant mov
>>  - fix comment
>>  - fix pointer deref
>
> Looks good. I submitted testing.

@vnkozlov The macos aarch64 failure indicates a fake address in a ConP node. Real external address targets fit into 48 bits and the masm encoding and patching code rely on that. I think this is because we are seeing a ConP encoding a byte_map_base with a negative value -- the C2 barrier set assembler can pass such a ConP nodes into the library kit. That will not happen when we are generating AOT code but will happen otherwise.

I will modify the encoding for ConP to only apply the external reloc when we are dumping generating AOT code and see if that fixes the problem.

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PR Comment: https://git.openjdk.org/jdk/pull/29884#issuecomment-3960241743