RFR: 8265756: AArch64: initialize memory allocated for locals according to Windows AArch64 stack page growth requirement in template interpreter

[David Holmes]

On Thu, 22 Apr 2021 15:55:40 GMT, Aleksei Voitylov <avoitylov at openjdk.org> wrote:

> Hi,
> 
> please review this PR which fixes several JCK test failures on Windows AArch64. On Windows AArch64, the order in which the pages are touched during stack allocation, matters. Here is a quote: "Functions that allocate 4k or more worth of stack must ensure that each page prior to the final page is touched in order" [1]. Since on Linux and Mac the order does not matter, the suggested fix reverses the order in which memory pages are touched during stack allocation for locals in template interpreter for all platforms.
> 
> Testing: JCK, jtreg, newly developed regression test on Linux AArch64, Windows AArch64, Mac AArch64, Pre-submit tests (which includes the newly developed test).
> 
> [1] https://docs.microsoft.com/en-us/cpp/build/arm64-windows-abi-conventions?view=msvc-160#stack

Can you please add comments to the new test explaining exactly what it is that the test is doing, why you need to use a jasm file etc. Also add an @bug tag to the test.

Thanks,
David

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PR: https://git.openjdk.java.net/jdk/pull/3633