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

[YaSuenag]

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.

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Warning

 ⚠️ Found leading lowercase letter in issue title for 8373110: jstack --mixed frames are broken on macOS after JDK-8371194

Issue

• JDK-8373110: jstack --mixed frames are broken on macOS after JDK-8371194 (Bug - P4)

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$ git pull https://git.openjdk.org/jdk.git pull/28686/head

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$ git pr checkout 28686

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[mlbridge]

Webrevs

• 01: Full - Incremental (f5eeeaaf)
• 00: Full (bb892eb5)

[shipilev]

Drive-by comment:

[plummercj]

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

"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.

[YaSuenag]

@plummercj

there is still an issue on macosx-x64. Stack traces are empty

Does it happen always? or intermittently?

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

I'm not sure, but I guess jstack could not unwind frame at some point(s) due to unwind info like DWARF on Linux - jstack might not handle call frame because the symbol could not be resolved.

[plummercj]

Does it happen always? or intermittently?

Always. Every thread and with every run. All of the thread stack traces just have the one empty frame.