RFR: 8367413: Refactor types in Arguments::set_heap_size() [v5]

[Albert Mingkun Yang]

On Tue, 7 Oct 2025 09:34:19 GMT, Joel Sikström <jsikstro at openjdk.org> wrote:

>> Hello,
>> 
>> There are several integer types used when setting the heap size ergonomically in `Arguments::set_heap_size()`, such as julong, uint64_t and size_t. It's not clear if this code works as intended on a 32-bit VM with more than 4GB physical memory. There might be issues when converting to/from size_t and uint64_t that we don't handle properly. I suggest we should be more robust and have more control over transitions between potentially smaller types. 
>> 
>> Additionally, I've gone ahead and added comments which I think makes it easier to understand what's going on in this function. I've tried my best to leave the existing behavior unchanged, apart from type conversion.
>> 
>> Testing:
>> * Oracle's tier1-8 on all Oracle supported platforms
>
> Joel Sikström has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Rename ram_limit_set to has_ram_limit

Marked as reviewed by ayang (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/27224#pullrequestreview-3309934893