RFR: 8301995: Move invokedynamic resolution information out of ConstantPoolCacheEntry [v3]

[Gui Cao]

On Tue, 14 Mar 2023 13:59:48 GMT, Matias Saavedra Silva <matsaave at openjdk.org> wrote:

>> The current structure used to store the resolution information for invokedynamic, ConstantPoolCacheEntry, is difficult to interpret due to its ambigious fields f1 and f2. This structure can hold information for fields, methods, and invokedynamics and each of its fields can hold different types of values depending on the entry. 
>> 
>> This enhancement proposes a new structure to exclusively contain invokedynamic information in a manner that is easy to interpret and easy to extend.  Resolved invokedynamic entries will be stored in an array in the constant pool cache and the operand of the invokedynamic bytecode will be rewritten to be the index into this array.
>> 
>> Any areas that previously accessed invokedynamic data from ConstantPoolCacheEntry will be replaced with accesses to this new array and structure. Verified with tier1-9 tests.
>> 
>> The PPC was provided by @reinrich and the RISCV port was provided by @DingliZhang and @zifeihan.
>> 
>> This change supports the following platforms: x86, aarch64, PPC, and RISCV
>
> Matias Saavedra Silva has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains five additional commits since the last revision:
> 
>  - Typo in comment
>  - Merge branch 'master' into resolvedIndyEntry_8301995
>  - Interpreter optimization and comments
>  - PPC and RISCV port
>  - 8301995: Move invokedynamic resolution information out of the cpCache

src/hotspot/cpu/aarch64/interp_masm_aarch64.cpp line 1843:

> 1841:   ldr(cache, Address(rcpool, in_bytes(ConstantPoolCache::invokedynamic_entries_offset())));
> 1842:   // Scale the index to be the entry index * sizeof(ResolvedInvokeDynamicInfo)
> 1843:   mov(tmp, sizeof(ResolvedIndyEntry));

The tmp register is not used here, is it redundant?

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PR: https://git.openjdk.org/jdk/pull/12778