RFR: 8274903: Zero: Support AsyncGetCallTrace [v5]

[Aleksey Shipilev]

On Tue, 30 Nov 2021 11:26:04 GMT, Andrew Haley <aph at openjdk.org> wrote:

>> Aleksey Shipilev has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains seven additional commits since the last revision:
>> 
>>  - Merge branch 'master' into JDK-8274903-zero-asyncgetcalltrace
>>  - Fix a comment
>>  - Merge branch 'master' into JDK-8274903-zero-asyncgetcalltrace
>>  - More reviews
>>  - Review feedback
>>  - Merge branch 'master' into JDK-8274903-zero-asyncgetcalltrace
>>  - Initial work: runs async-profiler successfully
>
> src/hotspot/cpu/zero/frame_zero.cpp line 139:
> 
>> 137:   assert(is_interpreted_frame(), "Not an interpreted frame");
>> 138:   // These are reasonable sanity checks
>> 139:   if (fp() == 0 || (intptr_t(fp()) & (wordSize-1)) != 0) {
> 
> Use `is_aligned()` here?

@theRealAph Do you agree with above? Any more comments?

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PR: https://git.openjdk.java.net/jdk/pull/5848