8256215: Shenandoah: re-organize saving/restoring machine state in assembler code

[shipilev]

This improves Shenandoah support on x86_32. There were numerous failures on lower UseSSE modes, which this patch is supposed to fix. The notable differences from the upstream is the absence of LRB-native code, which does not exist in 11u. Ditto for nmethod barriers that also do not exist in 11u.

Additional testing:

• Linux x86_64 fastdebug hotspot_gc_shenandoah
• Linux x86_64 fastdebug tier1 with Shenandoah
• Linux x86_32 fastdebug hotspot_gc_shenandoah with default, SSE=1, SSE=2
• Linux x86_32 fastdebug tier1 with Shenandoah default, SSE=1, SSE=2
• Linux x86_32 fastdebug tier2 with Shenandoah default, SSE=1, SSE=2

---

Progress

• Change must not contain extraneous whitespace
• Commit message must refer to an issue
• Change must be properly reviewed

Issue

• JDK-8256215: Shenandoah: re-organize saving/restoring machine state in assembler code

Reviewers

• Zhengyu Gu (@zhengyu123 - Reviewer)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.java.net/jdk11u-dev pull/111/head:pull/111
$ git checkout pull/111

Update a local copy of the PR:
$ git checkout pull/111
$ git pull https://git.openjdk.java.net/jdk11u-dev pull/111/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 111

View PR using the GUI difftool:
$ git pr show -t 111

Using diff file

Download this PR as a diff file:
https://git.openjdk.java.net/jdk11u-dev/pull/111.diff

[bridgekeeper]

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[openjdk]

This backport pull request has now been updated with issue from the original commit.

[mlbridge]

Webrevs

• 00: Full (357790d5)

[shipilev]

Friendly reminder. @rkennke, @zhengyu123?

[zhengyu123]

Looks good.

[openjdk]

@shipilev This change now passes all automated pre-integration checks.

After integration, the commit message for the final commit will be:

8256215: Shenandoah: re-organize saving/restoring machine state in assembler code

Reviewed-by: zgu

You can use pull request commands such as /summary, /contributor and /issue to adjust it as needed.

At the time when this comment was updated there had been 59 new commits pushed to the master branch:

• f700d37: 8255255: Update Apache Santuario (XML Signature) to version 2.2.1
• 227610d: 8267348: Rewrite gc/epsilon/TestClasses.java to use Metaspace with less classes
• d7a6e51: 8253899: Make IsClassUnloadingEnabled signature match specification
• 293d44f: 8262017: C2: assert(n != __null) failed: Bad immediate dominator info.
• 2a3d908: 8269661: JNI_GetStringCritical does not lock char array
• 6762216: 8267666: Add option to jcmd GC.heap_dump to use existing file
• 63c4ec2: 8259535: ECDSA SignatureValue do not always have the specified length
• 133eca0: 8235211: serviceability/attach/RemovingUnixDomainSocketTest.java fails with AttachNotSupportedException: Unable to open socket file
• 7501084: 8268965: TCP Connection Reset when connecting simple socket to SSL server
• d78e2be: 8227738: jvmti/DataDumpRequest/datadumpreq001 failed due to "exit code is 134"
• ... and 49 more: https://git.openjdk.java.net/jdk11u-dev/compare/2beb7e7a5834c45850e1bde8d98ed0839726db20...master

As there are no conflicts, your changes will automatically be rebased on top of these commits when integrating. If you prefer to avoid this automatic rebasing, please check the documentation for the /integrate command for further details.

➡️ To integrate this PR with the above commit message to the master branch, type /integrate in a new comment.

[shipilev]

Got the push approval.

/integrate

[openjdk]

Going to push as commit eaf59e0.
Since your change was applied there have been 59 commits pushed to the master branch:

• f700d37: 8255255: Update Apache Santuario (XML Signature) to version 2.2.1
• 227610d: 8267348: Rewrite gc/epsilon/TestClasses.java to use Metaspace with less classes
• d7a6e51: 8253899: Make IsClassUnloadingEnabled signature match specification
• 293d44f: 8262017: C2: assert(n != __null) failed: Bad immediate dominator info.
• 2a3d908: 8269661: JNI_GetStringCritical does not lock char array
• 6762216: 8267666: Add option to jcmd GC.heap_dump to use existing file
• 63c4ec2: 8259535: ECDSA SignatureValue do not always have the specified length
• 133eca0: 8235211: serviceability/attach/RemovingUnixDomainSocketTest.java fails with AttachNotSupportedException: Unable to open socket file
• 7501084: 8268965: TCP Connection Reset when connecting simple socket to SSL server
• d78e2be: 8227738: jvmti/DataDumpRequest/datadumpreq001 failed due to "exit code is 134"
• ... and 49 more: https://git.openjdk.java.net/jdk11u-dev/compare/2beb7e7a5834c45850e1bde8d98ed0839726db20...master

Your commit was automatically rebased without conflicts.

[openjdk]

@shipilev Pushed as commit eaf59e0.

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