RFR: 8373110: jstack --mixed frames are broken on macOS after JDK-8371194

[Chris Plummer]

On Sat, 6 Dec 2025 02:35:03 GMT, Yasumasa Suenaga <ysuenaga at openjdk.org> wrote:

> [JDK-8371194](https://bugs.openjdk.org/browse/JDK-8371194) (PR #28284) has broken PStack (jstack --mixed) behavior on macOS. It affects both AMD64 and AArch64. See JBS for details.
> 
> This PR fixes it to implement `CFrame::toFrame`.

macosx-aarch64 looks fine, but it looks like there is still an issue on macosx-x64. Stack traces are empty:

```----------------- 29955 -----------------
"Reference Handler" #15 daemon prio=10 tid=0x00007f94c0820010 nid=29955 waiting on condition [0x000070000e080000]
   java.lang.Thread.State: RUNNABLE
   JavaThread state: _thread_blocked
0x00007ff803c3b6f6		????????

Before this change you at least got a partial stack followed by the UnsupportedPlatformException.

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PR Comment: https://git.openjdk.org/jdk/pull/28686#issuecomment-3628901897