RFR: 8319875: Add macOS implementation for jcmd System.map [v14]

[Thomas Stuefe]

On Fri, 6 Dec 2024 22:55:22 GMT, Simon Tooke <stooke at openjdk.org> wrote:

>> This is a port of #16301  to macOS.
>> 
>> System.map and System.dump_map are implemented using the macOS API and provide roughly the same information in the same format. Most of the heavy lifting was implemented by @tstuefe in https://github.com/openjdk/jdk/pull/16301 - this PR adds the macOS implementation and enables the common code for macOS 64 bit.
>> 
>> The System.map tests are also reworked to be cleaner for the three implementations.
>> 
>> [sample output using G1GC](https://github.com/user-attachments/files/17558064/g1_map.txt)
>> [sample output using ZGC](https://github.com/user-attachments/files/17558067/zgc_map.txt)
>
> Simon Tooke has updated the pull request incrementally with one additional commit since the last revision:
> 
>   add constant

Okay!

Needs a second review. @ashu-mehra, maybe?

src/hotspot/os/bsd/memMapPrinter_macosx.cpp line 49:

> 47: static const int MAX_REGIONS_RETURNED = 1000000;
> 48: 
> 49: /* 

Can you fix the whitespace error, please? jcheck should pass.

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Marked as reviewed by stuefe (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/20953#pullrequestreview-2488780245
PR Review Comment: https://git.openjdk.org/jdk/pull/20953#discussion_r1875967453