RFR: 8299974: Replace NULL with nullptr in share/adlc/

[Dean Long]

On Tue, 16 May 2023 11:54:20 GMT, Johan Sjölen <jsjolen at openjdk.org> wrote:

> Hi, this PR changes all occurrences of NULL to nullptr for the subdirectory share/adlc. Unfortunately the script that does the change isn't perfect, and so we need to comb through these manually to make sure nothing has gone wrong. I also review these changes but things slip past my eyes sometimes.
> 
> Here are some typical things to look out for:
> 
> 1. No changes but copyright header changed (probably because I reverted some changes but forgot the copyright).
> 2. Macros having their NULL changed to nullptr, these are added to the script when I find them. They should be NULL.
> 3. nullptr in comments and logs. We try to use lower case "null" in these cases as it reads better. An exception is made when code expressions are in a comment.
> 
> An example of this:
> 
> ```c++
> // This function returns null
> void* ret_null();
> // This function returns true if *x == nullptr
> bool is_nullptr(void** x);
> 
> 
> Note how `nullptr` participates in a code expression here, we really are talking about the specific value `nullptr`.
> 
> Thanks!

src/hotspot/share/adlc/archDesc.cpp line 85:

> 83:   output(stderr);
> 84: }
> 85: 

Missing copyright year update.

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PR Review Comment: https://git.openjdk.org/jdk/pull/14008#discussion_r1204607799