RFR: 8292647: javac/lambda/T8031967.java fails with StackOverflowError when use -XX:TieredStopAtLevel=3 on aarch64 and LoongArch [v3]

[SUN Guoyun]

On Wed, 8 Feb 2023 09:21:30 GMT, SUN Guoyun <duke at openjdk.org> wrote:

>> make images run-test TEST=tools/javac/lambda/T8031967.java will fails with StackOverflowError when I use args JTREG="VM_OPTIONS=-XX:TieredStopAtLevel=3" on aarch64 and LoongArch. So the stack size `-Xss10m` needs to be increased to improve the robustness of the testcase.
>
> SUN Guoyun 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 three additional commits since the last revision:
> 
>  - Merge branch 'openjdk:master' into 8292647
>  - 8292647: javac/lambda/T8031967.java fails with StackOverflowError when use -XX:TieredStopAtLevel=3 on aarch64 and LoongArch
>  - 8292647: javac/lambda/T8031967.java fails with StackOverflowError when use -XX:TieredStopAtLevel=3 on aarch64 and LoongArch

Sorry, I can't confirm which version reproduces the issue on aarch64. But the conclusion that aarch64 requires more stack space than x86_64 holds. i.e. `java.lang.Object::<init>` has a 0x30 stack size on x86_64 platforms, but 0x40 stack size on aarch64.

For x86_64
<pre><code class="shell">
----------------------------------- Assembly -----------------------------------
                                                                                
Compiled method (c1)      70    1       3       java.lang.Object::<init> (1 bytes)
...
[Verified Entry Point]                                                          
  0x00007fb8191cc740:   mov    %eax,-0x18000(%rsp)                              
  0x00007fb8191cc747:   push   %rbp                                             
  0x00007fb8191cc748:   sub    $0x30,%rsp    // stack size is 0x30

</code></pre>

For aarch64
<pre><code class="shell">
----------------------------------- Assembly -----------------------------------

Compiled method (c1)      64    1       3       java.lang.Object::<init> (1 bytes)
...
[Verified Entry Point]
  0x0000ffff9c22b980:   nop
  0x0000ffff9c22b984:   sub	x9, sp, #0x19, lsl #12
  0x0000ffff9c22b988:   str	xzr, [x9]
  0x0000ffff9c22b98c:   sub	sp, sp, #0x40          //stack size is 0x40, larger than x86_64
  0x0000ffff9c22b990:   stp	x29, x30, [sp, #48]
</code></pre>

-------------

PR: https://git.openjdk.org/jdk/pull/9934