8349110: [lworld] Intrinsics for Unsafe.get/putFlatValue #1482

merykitty · 2025-06-06T11:46:23Z

Hi,

This PR implements intrinsics for Unsafe::get/putFlatValue and enables the corresponding tests in TestIntrinsics.

Please kindly review, thanks very much.

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Issue

JDK-8349110: [lworld] Intrinsics for Unsafe.get/putFlatValue (Bug - P3)

Reviewers

Tobias Hartmann (@TobiHartmann - Committer)

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bridgekeeper · 2025-06-06T11:46:55Z

👋 Welcome back qamai! A progress list of the required criteria for merging this PR into lworld will be added to the body of your pull request. There are additional pull request commands available for use with this pull request.

openjdk · 2025-06-06T11:47:47Z

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

ℹ️ This project also has non-automated pre-integration requirements. Please see the file CONTRIBUTING.md for details.

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

8349110: [lworld] Intrinsics for Unsafe.get/putFlatValue

Reviewed-by: thartmann

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 14 new commits pushed to the lworld branch:

64fe6c1: 8361496: [lworld] Treating interfaces as isValue() leads to failed assert
293e16d: 8361465: [lworld] testlibrary_tests/ir_framework/tests/TestPhaseIRMatching.java fails
7e4c1bc: 8361082: [lworld] RewriteBytecodesInlineTest fails with SIGSEGV
... and 11 more: https://git.openjdk.org/valhalla/compare/051283b610d1b49446bb3838e7c4c9d87c8616cd...lworld

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 lworld branch, type /integrate in a new comment.

mlbridge · 2025-06-06T11:51:23Z

Webrevs

TobiHartmann · 2025-06-12T11:14:47Z

Thanks for working on this Quan-Anh! I executed some quick testing and noticed that TestIntrinsics fails:

 359  InlineType  === _ 13 15 16 24 25 31 37 43 52 65 74 110 111  [[ 394 360 360 384 374 ]]  #compiler/valhalla/inlinetypes/MyValue1 (compiler/valhalla/inlinetypes/MyInterface):NotNull:exact *  Oop:compiler/valhalla/inlinetypes/MyValue1 (compiler/valhalla/inlinetypes/MyInterface):NotNull:exact * !orig=14 !jvms: TestIntrinsics::test72 @ bci:-1 (line 1456)
 394  AddP  === _ 359 360 87  [[ 399 ]]   Oop:compiler/valhalla/inlinetypes/MyValue1 (compiler/valhalla/inlinetypes/MyInterface):NotNull:exact+bot * [narrow] !jvms: TestIntrinsics::test72 @ bci:21 (line 1458)

# A fatal error has been detected by the Java Runtime Environment:
#
#  Internal Error (/workspace/open/src/hotspot/share/opto/compile.cpp:2073), pid=1806857, tid=1806873
#  assert(false) failed: Should have been buffered
#
# JRE version: Java(TM) SE Runtime Environment (25.0) (fastdebug build 25-lworld5ea-LTS-2025-06-11-1437268.tobias.hartmann.valhalla2)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (fastdebug 25-lworld5ea-LTS-2025-06-11-1437268.tobias.hartmann.valhalla2, mixed mode, compressed class ptrs, g1 gc, linux-amd64)
# Problematic frame:
# V  [libjvm.so+0xb384b1]  Compile::process_inline_types(PhaseIterGVN&, bool)+0xa11

Current CompileTask:
C2:3962  662    b        compiler.valhalla.inlinetypes.TestIntrinsics::test72 (78 bytes)

Stack: [0x00007f84bb8fa000,0x00007f84bb9fa000],  sp=0x00007f84bb9f5080,  free space=1004k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V  [libjvm.so+0xb384b1]  Compile::process_inline_types(PhaseIterGVN&, bool)+0xa11  (compile.cpp:2073)
V  [libjvm.so+0xb55115]  Compile::Optimize()+0x1365  (compile.cpp:3033)
V  [libjvm.so+0xb57cff]  Compile::Compile(ciEnv*, ciMethod*, int, Options, DirectiveSet*)+0x1fef  (compile.cpp:874)
V  [libjvm.so+0x96de34]  C2Compiler::compile_method(ciEnv*, ciMethod*, int, bool, DirectiveSet*)+0x484  (c2compiler.cpp:143)
V  [libjvm.so+0xb659b8]  CompileBroker::invoke_compiler_on_method(CompileTask*)+0xb58  (compileBroker.cpp:2307)
V  [libjvm.so+0xb66b78]  CompileBroker::compiler_thread_loop()+0x568  (compileBroker.cpp:1951)
V  [libjvm.so+0x10e113b]  JavaThread::thread_main_inner()+0x13b  (javaThread.cpp:774)
V  [libjvm.so+0x1b5c406]  Thread::call_run()+0xb6  (thread.cpp:231)
V  [libjvm.so+0x17c7fb8]  thread_native_entry(Thread*)+0x128  (os_linux.cpp:875)

It mostly seems to fail on linux-aarch64-debug in various configurations for some reason but also once on x64 with -XX:+UnlockDiagnosticVMOptions -XX:-TieredCompilation -XX:+StressArrayCopyMacroNode -XX:+StressCallingConvention -XX:+StressLCM -XX:+StressGCM -XX:+StressCCP -XX:+StressIGVN -XX:+StressReflectiveCode -XX:+StressMethodHandleLinkerInlining -XX:+StressCompiledExceptionHandlers -XX:MaxNodeLimit=100000.

TobiHartmann · 2025-06-12T11:22:28Z

I also noticed that there are still two leftover ToDos from JDK-8239003 in TestIntrinsics. I think test54 should be removed because C2 will bail out from compilation. I quickly checked and it also seems that we can re-enable the test with -XX:+DeoptimizeALot again.

merykitty · 2025-06-13T23:52:34Z

@TobiHartmann It was because I need to buffer the InlineTypeNode if a load is required, I have added necessary handling for InlineTypeNode. For the TODOs in TestIntrinsics, test54 seems like it can be removed since it tries to pass a larval value object to another method, test79 and test84 can be reenabled. For test84, I think an allocation is still necessary for the return value, so I remove that IR condition.

TobiHartmann · 2025-06-16T11:49:53Z

Thanks for investigating! What about this one?

valhalla/test/hotspot/jtreg/compiler/valhalla/inlinetypes/TestIntrinsics.java

Lines 72 to 73 in 0bbfece

    
           // Don't run with DeoptimizeALot until JDK-8239003 is fixed 
        
           "-XX:-DeoptimizeALot")

TobiHartmann · 2025-06-16T11:52:56Z

For test84, I think an allocation is still necessary for the return value, so I remove that IR condition.

But that should only be needed if InlineTypeReturnedAsFields is turned off, right? Can we restrict the IR rule accordingly?

merykitty · 2025-06-16T12:43:00Z

Thanks for investigating! What about this one?

Ah yes I missed that, removed!

But that should only be needed if InlineTypeReturnedAsFields is turned off, right? Can we restrict the IR rule accordingly?

Unfortunately MyValue1 has 15 GPR fields so I don't think it can be returned as fields.

TobiHartmann · 2025-06-16T14:38:07Z

Unfortunately MyValue1 has 15 GPR fields so I don't think it can be returned as fields.

Ah, makes sense! Thanks. I'll re-run testing.

TobiHartmann · 2025-06-17T06:00:41Z

Testing looks good now except for one last failure with compiler/valhalla/inlinetypes/TestIntrinsics.java and -XX:Tier0BackedgeNotifyFreqLog=0 -XX:Tier2BackedgeNotifyFreqLog=0 -XX:Tier3BackedgeNotifyFreqLog=0 -XX:Tier2BackEdgeThreshold=1 -XX:Tier3BackEdgeThreshold=1 -XX:Tier4BackEdgeThreshold=1 -Xbatch:

# A fatal error has been detected by the Java Runtime Environment:
#
#  Internal Error (/opt/mach5/mesos/work_dir/slaves/d2398cde-9325-49c3-b030-8961a4f0a253-S509733/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/d98a4bd7-58a9-4f29-b8d0-431bc28dcc7e/runs/a5899c58-42e7-464d-909b-9619da50104d/workspace/open/src/hotspot/share/prims/unsafe.cpp:256), pid=2121432, tid=2121433
#  assert(_obj == nullptr || !_obj->is_inline_type() || _obj->mark().is_larval_state()) failed: must be an object instance or a larval inline type
#
# JRE version: Java(TM) SE Runtime Environment (25.0) (fastdebug build 25-lworld5ea-LTS-2025-06-16-1439046.tobias.hartmann.valhalla2)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (fastdebug 25-lworld5ea-LTS-2025-06-16-1439046.tobias.hartmann.valhalla2, mixed mode, sharing, tiered, compressed oops, compressed class ptrs, g1 gc, linux-amd64)
# Problematic frame:
# V  [libjvm.so+0x1bbe2be]  Unsafe_PutInt+0x28e

Stack: [0x00007ff7140b4000,0x00007ff7141b5000],  sp=0x00007ff7141b33b0,  free space=1020k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V  [libjvm.so+0x1bbe2be]  Unsafe_PutInt+0x28e  (unsafe.cpp:256)
J 3090  jdk.internal.misc.Unsafe.putInt(Ljava/lang/Object;JI)V java.base@25-lworld5ea (0 bytes) @ 0x00007ff6fc8582c4 [0x00007ff6fc858220+0x00000000000000a4]
j  compiler.valhalla.inlinetypes.TestIntrinsics.test84(Lcompiler/valhalla/inlinetypes/MyValue1;)Lcompiler/valhalla/inlinetypes/MyValue1;+46
j  compiler.valhalla.inlinetypes.TestIntrinsics.test84_verifier()V+16
J 3280 c2 java.lang.invoke.LambdaForm$DMH+0x000000002e091000.invokeVirtual(Ljava/lang/Object;Ljava/lang/Object;)V java.base@25-lworld5ea (14 bytes) @ 0x00007ff6fc883fe0 [0x00007ff6fc883fa0+0x0000000000000040]
j  java.lang.invoke.LambdaForm$MH+0x000000002e105800.invoke(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;+35 java.base@25-lworld5ea
J 3271 c2 jdk.internal.reflect.DirectMethodHandleAccessor.invoke(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object; java.base@25-lworld5ea (92 bytes) @ 0x00007ff6fc881c80 [0x00007ff6fc881ba0+0x00000000000000e0]
j  java.lang.reflect.Method.invoke(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;+102 java.base@25-lworld5ea
j  compiler.lib.ir_framework.test.CustomRunTest.invokeTest()V+49
J 3044 c2 compiler.lib.ir_framework.test.AbstractTest.run()V (41 bytes) @ 0x00007ff6fc846620 [0x00007ff6fc8465a0+0x0000000000000080]
J 3052% c2 compiler.lib.ir_framework.test.TestVM.runTests()V (535 bytes) @ 0x00007ff6fc84afdc [0x00007ff6fc84af20+0x00000000000000bc]
j  compiler.lib.ir_framework.test.TestVM.start()V+9
j  compiler.lib.ir_framework.test.TestVM.main([Ljava/lang/String;)V+38
v  ~StubRoutines::call_stub 0x00007ff6fbd18001
V  [libjvm.so+0x10a5728]  JavaCalls::call_helper(JavaValue*, methodHandle const&, JavaCallArguments*, JavaThread*)+0x508  (javaCalls.cpp:429)
V  [libjvm.so+0x12037c0]  jni_invoke_static(JNIEnv_*, JavaValue*, _jobject*, JNICallType, _jmethodID*, JNI_ArgumentPusher*, JavaThread*) [clone .constprop.1]+0x420  (jni.cpp:887)
V  [libjvm.so+0x12077b4]  jni_CallStaticVoidMethod+0x214  (jni.cpp:1746)
C  [libjli.so+0x3b9a]  invokeStaticMainWithArgs+0x4a  (java.c:392)
C  [libjli.so+0x4c78]  JavaMain+0xf08  (java.c:640)
C  [libjli.so+0x8019]  ThreadJavaMain+0x9  (java_md.c:646)
Java frames: (J=compiled Java code, j=interpreted, Vv=VM code)
J 3090  jdk.internal.misc.Unsafe.putInt(Ljava/lang/Object;JI)V java.base@25-lworld5ea (0 bytes) @ 0x00007ff6fc858292 [0x00007ff6fc858220+0x0000000000000072]
j  compiler.valhalla.inlinetypes.TestIntrinsics.test84(Lcompiler/valhalla/inlinetypes/MyValue1;)Lcompiler/valhalla/inlinetypes/MyValue1;+46
j  compiler.valhalla.inlinetypes.TestIntrinsics.test84_verifier()V+16
J 3280 c2 java.lang.invoke.LambdaForm$DMH+0x000000002e091000.invokeVirtual(Ljava/lang/Object;Ljava/lang/Object;)V java.base@25-lworld5ea (14 bytes) @ 0x00007ff6fc883fe0 [0x00007ff6fc883fa0+0x0000000000000040]
j  java.lang.invoke.LambdaForm$MH+0x000000002e105800.invoke(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;+35 java.base@25-lworld5ea
J 3271 c2 jdk.internal.reflect.DirectMethodHandleAccessor.invoke(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object; java.base@25-lworld5ea (92 bytes) @ 0x00007ff6fc881c80 [0x00007ff6fc881ba0+0x00000000000000e0]
j  java.lang.reflect.Method.invoke(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;+102 java.base@25-lworld5ea
j  compiler.lib.ir_framework.test.CustomRunTest.invokeTest()V+49
J 3044 c2 compiler.lib.ir_framework.test.AbstractTest.run()V (41 bytes) @ 0x00007ff6fc846620 [0x00007ff6fc8465a0+0x0000000000000080]
J 3052% c2 compiler.lib.ir_framework.test.TestVM.runTests()V (535 bytes) @ 0x00007ff6fc84afdc [0x00007ff6fc84af20+0x00000000000000bc]
j  compiler.lib.ir_framework.test.TestVM.start()V+9
j  compiler.lib.ir_framework.test.TestVM.main([Ljava/lang/String;)V+38
v  ~StubRoutines::call_stub 0x00007ff6fbd18001

merykitty · 2025-07-20T13:21:30Z

@TobiHartmann The crash is due to JDK-8322547. I have excluded the test.

TobiHartmann

Ah, right. Let's convert this one to a bug then. Your changes look good to me. Thanks again!

merykitty · 2025-07-22T13:48:28Z

@TobiHartmann Thanks a lot for your reviews!
/integrate

openjdk · 2025-07-22T13:49:13Z

Going to push as commit d1c3062.
Since your change was applied there have been 14 commits pushed to the lworld branch:

64fe6c1: 8361496: [lworld] Treating interfaces as isValue() leads to failed assert
293e16d: 8361465: [lworld] testlibrary_tests/ir_framework/tests/TestPhaseIRMatching.java fails
7e4c1bc: 8361082: [lworld] RewriteBytecodesInlineTest fails with SIGSEGV
... and 11 more: https://git.openjdk.org/valhalla/compare/051283b610d1b49446bb3838e7c4c9d87c8616cd...lworld

Your commit was automatically rebased without conflicts.

openjdk · 2025-07-22T13:49:24Z

@merykitty Pushed as commit d1c3062.

💡 You may see a message that your pull request was closed with unmerged commits. This can be safely ignored.

Implement Unsafe::flatValue accesses

1673d7b

openjdk bot added ready Pull request is ready to be integrated rfr Pull request is ready for review labels Jun 6, 2025

merykitty added 2 commits June 14, 2025 06:26

Buffer an InlineTypeNode on mismatched access

0edc1de

Revisit TODOs in TestIntrinsics

cf137ea

remove -DeoptimizeALot

7437823

merykitty added 2 commits July 20, 2025 15:25

Merge branch 'lworld' into unsafeflatvalue

b156f8f

exclude test84

3327b8a

TobiHartmann approved these changes Jul 21, 2025

View reviewed changes

openjdk bot added the integrated Pull request has been integrated label Jul 22, 2025

openjdk bot closed this Jul 22, 2025

openjdk bot removed ready Pull request is ready to be integrated rfr Pull request is ready for review labels Jul 22, 2025

8349110: [lworld] Intrinsics for Unsafe.get/putFlatValue #1482

8349110: [lworld] Intrinsics for Unsafe.get/putFlatValue #1482

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