8266746: C1: Replace UnsafeGetRaw with UnsafeGet when setting up OSR entry block #3917

y1yang0 · 2021-05-07T14:41:43Z

After JDK-8150921, most Unsafe{Get,Put}Raw intrinsic methods can be replaced by Unsafe{Get,Put}Object.

There is the only one occurrence where c1 refers UnsafeGetRaw among GraphBuilder::setup_osr_entry_block()

jdk/src/hotspot/share/c1/c1_GraphBuilder.cpp

Lines 3143 to 3157 in 74fecc0

    
           for_each_local_value(state, index, local) { 
        
             int offset = locals_offset - (index + local->type()->size() - 1) * BytesPerWord; 
        
             Value get; 
        
             if (local->type()->is_object_kind() && !live_oops.at(index)) { 
        
               // The interpreter thinks this local is dead but the compiler 
        
               // doesn't so pretend that the interpreter passed in null. 
        
               get = append(new Constant(objectNull)); 
        
             } else { 
        
               get = append(new UnsafeGetRaw(as_BasicType(local->type()), e, 
        
                                             append(new Constant(new IntConstant(offset))), 
        
                                             0, 
        
                                             true /*unaligned*/, true /*wide*/)); 
        
             } 
        
             _state->store_local(index, get); 
        
           }

We can replace UnsafeGetRaw with UnsafeGetObject when setting up OSR entry block. After that, Unsafe{Get,Put}Raw can be completely removed because no one refers to them.

(This patch actually does two things:

Replace UnsafeGetRaw with UnsafeGetObject when setting up OSR entry block This is the only occurrence where c1 refers UnsafeGetRaw
Cleanup unused Unsafe{Get,Put}Raw code
They are related so I put it together, but I still want to hear your suggestions, I will separate them into two patches if you think it is more reasonable)

Thanks!
Yang

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Issue

JDK-8266746: C1: Replace UnsafeGetRaw with UnsafeGet when setting up OSR entry block

Reviewers

Tobias Hartmann (@TobiHartmann - Reviewer) ⚠️ Review applies to 8c239e4
Dean Long (@dean-long - Reviewer) ⚠️ Review applies to be6b989
Martin Doerr (@TheRealMDoerr - Reviewer)

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bridgekeeper · 2021-05-07T14:42:42Z

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

openjdk · 2021-05-07T14:45:11Z

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mlbridge · 2021-05-07T14:50:18Z

Webrevs

dean-long · 2021-05-07T20:51:17Z

Hi Yang. If the OptimizeUnsafes feature was ever useful for UnsafeGetRaw, then maybe we should apply that optimization to the UnsafeGetObject-with-null-object case rather than removing the feature. Could you try it?

dean-long · 2021-05-07T21:15:44Z

Also, I can't find where the UnsafeGetObject implementation handles the unaligned/wide flags of UnsafeGetRaw.

It would be good to get this change reviewed by someone from GC, since UnsafeGetRaw uses the GC barrier interface to do its work.

dean-long · 2021-05-07T21:17:14Z

/cc hotspot-gc

openjdk · 2021-05-07T21:22:16Z

@dean-long
The hotspot-gc label was successfully added.

y1yang0 · 2021-05-08T02:44:45Z

Hi Dean,

Thanks for noticing this PR.

If the OptimizeUnsafes feature was ever useful for UnsafeGetRaw, then maybe we should apply that optimization to the UnsafeGetObject-with-null-object case rather than removing the feature. Could you try it?

Yes, I will investigate this and file an issue if it's possible to canonicalize UnsafeGetObject as well.

Also, I can't find where the UnsafeGetObject implementation handles the unaligned/wide flags of UnsafeGetRaw.

I think access_load already handles the wide flag

jdk/src/hotspot/share/gc/shared/c1/barrierSetC1.cpp

Line 182 in 74fecc0

__ move_wide(access.resolved_addr()->as_address_ptr(), result);

Internally, move_wide will check the type and decide whether to execute the "wide" semantics according to the type, so using access_load for all types is ok.

As for the unaligned flag, I found that it only affects PPC and s390 (which is why the pre-submit test passed), and access_load is not aware of this flag, I think they should really need to be handled.

It would be good to get this change reviewed by someone from GC, since UnsafeGetRaw uses the GC barrier interface to do its work.

Yes, I'm looking forward to hearing suggestions from GC folks!

y1yang0 · 2021-05-19T02:42:13Z

PING: May I ask your help to review this patch?

TobiHartmann

Looks good to me but this should be tested on all platforms.

TobiHartmann · 2021-05-19T08:27:40Z

src/hotspot/share/c1/c1_LIRGenerator.cpp

+  LIR_Opr offset = new_register(T_LONG);
+  __ convert(Bytecodes::_i2l, off.result(), offset);
+#else
+  LIR_Opr offset = off.result();


The indentation is wrong in the else branch.

TobiHartmann · 2021-05-19T08:38:30Z

src/hotspot/share/c1/c1_GraphBuilder.cpp

-                                    true /*unaligned*/, true /*wide*/));
+      Value off_val = append(new Constant(new IntConstant(offset)));
+      get = append(new UnsafeGetObject(as_BasicType(local->type()), e,
+                                      off_val,


Indentation is wrong.

TobiHartmann · 2021-05-19T08:47:12Z

src/hotspot/share/c1/c1_Instruction.hpp

+  }
+
+  // accessors
+  bool is_raw_get()                             { return _is_raw_get; }


I would rename this to _is_raw because we already know it's a get.

Thanks Tobias for the review! All fixed. I will test it on Linux(already tested)/Mac/Windows(aarch64+x86_64) later. But I don't have ppc and s390 machines so I'm not sure how to test it on them...

Looks good. Maybe someone from the OpenJDK community can run some sanity testing on ppc/s390.

openjdk · 2021-05-19T08:59:11Z

@kelthuzadx 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:

8266746: C1: Replace UnsafeGetRaw with UnsafeGet when setting up OSR entry block

Replace UnsafeGetRaw with UnsafeGetObject when setting up OSR entry block, and rename Unsafe{Get,Put}Object to Unsafe{Get,Put}

Reviewed-by: thartmann, dlong, mdoerr

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 861 new commits pushed to the master branch:

a6b253d: 8269416: [JVMCI] capture libjvmci crash data to a file
a0f32cb: 8268906: gc/g1/mixedgc/TestOldGenCollectionUsage.java assumes that GCs take 1ms minimum
ee0247f: 8263461: jdk/jfr/event/gc/detailed/TestEvacuationFailedEvent.java uses wrong mechanism to cause evacuation failure
3ad20fc: 8269571: NMT should print total malloc bytes and invocation count
b969136: 8245877: assert(_value != __null) failed: resolving NULL _value in JvmtiExport::post_compiled_method_load
ee526a2: Merge
0d745ae: 8269034: AccessControlException for SunPKCS11 daemon threads
d042029: 8269529: javax/swing/reliability/HangDuringStaticInitialization.java fails in Windows debug build
401cb0a: 8269232: assert(!is_jweak(handle)) failed: wrong method for detroying jweak
b8a16e9: 8268884: C2: Compile::remove_speculative_types must iterate top-down
... and 851 more: https://git.openjdk.java.net/jdk/compare/80941f475f7f3bd479f1ab75287f0ffe7935ad05...master

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dean-long

It looks like when JDK-8150921 was done, some micro-benchmarks were run, and @shipilev noticed a regression in C1 with constant null handling:
http://cr.openjdk.java.net/~shade/8150921/notes.txt
Looking over the code review:
https://mail.openjdk.java.net/pipermail/hotspot-compiler-dev/2016-May/022767.html
I don't see any references to benchmark testing that would check for any regressions in the InlineUnsafeOps + OptimizeUnsafes optimization that 8150921 mostly bypassed. @vidmik
Now this PR proposes to remove this mostly dead code. I'm OK with that, since blindly reviving it risks hitting bitrot, but for compleness, perhaps we should file 2 followup RFEs:

investigate constant null C1 regression
measure if the dead InlineUnsafeOps + OptimizeUnsafes optimization is worth reviving in a later release (with sufficient bake time)

y1yang0 · 2021-05-26T10:54:45Z

It looks like when JDK-8150921 was done, some micro-benchmarks were run, and @shipilev noticed a regression in C1 with constant null handling:
http://cr.openjdk.java.net/~shade/8150921/notes.txt
Looking over the code review:
https://mail.openjdk.java.net/pipermail/hotspot-compiler-dev/2016-May/022767.html
I don't see any references to benchmark testing that would check for any regressions in the InlineUnsafeOps + OptimizeUnsafes optimization that 8150921 mostly bypassed. @vidmik
Now this PR proposes to remove this mostly dead code. I'm OK with that, since blindly reviving it risks hitting bitrot, but for compleness, perhaps we should file 2 followup RFEs:

investigate constant null C1 regression

measure if the dead InlineUnsafeOps + OptimizeUnsafes optimization is worth reviving in a later release (with sufficient bake time)

They are indeed necessary. Thanks for sharing more information about JDK-8150921. I've filed JDK-8267783 and JDK-8267782 and assign them to me, I would investigate and check if it's worth doing later.

y1yang0 · 2021-06-01T06:35:59Z

Tests are passed on both aarch64 and x64. Can someone help running sanity checks on s390/ppc machines? Thanks a lot.

y1yang0 · 2021-06-25T02:33:23Z

@TobiHartmann @dean-long It seems that there is no easy way to test this PR on all architectures. Can I merge this PR in this case? If not, do you have a general solution for changes that should be tested on all architectures while the author can not cover all architectures for PR that they made? Thanks in advance!

dean-long · 2021-06-25T20:33:03Z

@TheRealMDoerr, could someone at SAP test this change on s390 and ppc, please?

TheRealMDoerr · 2021-06-28T12:18:20Z

Thanks for checking with us! I've given it a quick spin and it seems to work on s390. However, I got the following error on ppc64:
Internal Error (src/hotspot/cpu/ppc/c1_LIRAssembler_ppc.cpp:1175)
assert(!unaligned) failed: unexpected

V [libjvm.so+0x64703c] LIR_Assembler::mem2reg(LIR_OprDesc*, LIR_OprDesc*, BasicType, LIR_PatchCode, CodeEmitInfo*, b
ool, bool)+0x51c
V [libjvm.so+0x6399e4] LIR_Assembler::move_op(LIR_OprDesc*, LIR_OprDesc*, BasicType, LIR_PatchCode, CodeEmitInfo*, b
ool, bool, bool)+0x464
V [libjvm.so+0x63abac] LIR_Assembler::emit_op1(LIR_Op1*)+0x56c
V [libjvm.so+0x62283c] LIR_Op1::emit_code(LIR_Assembler*)+0x2c
V [libjvm.so+0x63bddc] LIR_Assembler::emit_lir_list(LIR_List*)+0x11c

TheRealMDoerr

If you want to use unaligned_move, please remove the assertions (the derived PPC64 instructions do support unaligned access):

--- a/src/hotspot/cpu/ppc/c1_LIRAssembler_ppc.cpp
+++ b/src/hotspot/cpu/ppc/c1_LIRAssembler_ppc.cpp
@@ -1172,7 +1172,6 @@ void LIR_Assembler::mem2reg(LIR_Opr src_opr, LIR_Opr dest, BasicType type,
     assert(Assembler::is_simm16(disp_value), "should have set this up");
     offset = load(src, disp_value, to_reg, type, wide, unaligned);
   } else {
-    assert(!unaligned, "unexpected");
     offset = load(src, disp_reg, to_reg, type, wide);
   }
 
@@ -1301,7 +1300,6 @@ void LIR_Assembler::reg2mem(LIR_Opr from_reg, LIR_Opr dest, BasicType type,
     assert(Assembler::is_simm16(disp_value), "should have set this up");
     offset = store(from_reg, src, disp_value, type, wide, unaligned);
   } else {
-    assert(!unaligned, "unexpected");
     offset = store(from_reg, src, disp_reg, type, wide);
   }

TheRealMDoerr · 2021-06-28T16:13:11Z

src/hotspot/share/c1/c1_LIRGenerator.cpp

+#endif
+    LIR_Address* addr = new LIR_Address(src.result(), offset, type);
+    if (type == T_LONG || type == T_DOUBLE) {
+      __ unaligned_move(addr, result);


You're always using unaligned_move. Old code checks x->may_be_unaligned(). May be ok, though.

Thank you Martin for running these tests!

In this case, may_be_unaligned is must-be-unaligned since setup_osr_entry_block always creates unaligned UnsafeGetRaw before.

TheRealMDoerr

Thanks for taking care of PPC64. I haven't seen errors with this version. But I have some remarks:

I think the name UnsafeGetObject is confusing, now. It's no longer used for objects only.
The "unaligned" parameter is unused on all platforms, now. Note that PPC64 and s390 support unaligned accesses, too. I believe it was used by SPARC which has been removed.

y1yang0 · 2021-06-30T06:38:47Z

Thanks for taking care of PPC64. I haven't seen errors with this version. But I have some remarks:

I think the name UnsafeGetObject is confusing, now. It's no longer used for objects only.

The "unaligned" parameter is unused on all platforms, now. Note that PPC64 and s390 support unaligned accesses, too. I believe it was used by SPARC which has been removed.

Yes, I agree, how about changing Unsafe{Get,Put}Object to Unsafe{Get,Put}:

void GraphBuilder::build_graph_for_intrinsic(ciMethod* callee, bool ignore_return) {
  vmIntrinsics::ID id = callee->intrinsic_id();
  assert(id != vmIntrinsics::_none, "must be a VM intrinsic");

  // Some intrinsics need special IR nodes.
  switch(id) {
  case vmIntrinsics::_getReference       : append_unsafe_get_obj(callee, T_OBJECT,  false); return;
  case vmIntrinsics::_getBoolean         : append_unsafe_get_obj(callee, T_BOOLEAN, false); return;
  case vmIntrinsics::_getByte            : append_unsafe_get_obj(callee, T_BYTE,    false); return;
  case vmIntrinsics::_getShort           : append_unsafe_get_obj(callee, T_SHORT,   false); return;
  case vmIntrinsics::_getChar            : append_unsafe_get_obj(callee, T_CHAR,    false); return;
  case vmIntrinsics::_getInt             : append_unsafe_get_obj(callee, T_INT,     false); return;
  case vmIntrinsics::_getLong            : append_unsafe_get_obj(callee, T_LONG,    false); return;
  case vmIntrinsics::_getFloat           : append_unsafe_get_obj(callee, T_FLOAT,   false); return;
  
  ...
}


void GraphBuilder::append_unsafe_get_obj(ciMethod* callee, BasicType t, bool is_volatile) {
  Values* args = state()->pop_arguments(callee->arg_size());
  null_check(args->at(0));
  Instruction* offset = args->at(2);
#ifndef _LP64
  offset = append(new Convert(Bytecodes::_l2i, offset, as_ValueType(T_INT)));
#endif
  Instruction* op = append(new UnsafeGetObject(t, args->at(1), offset, is_volatile));
  push(op->type(), op);
  compilation()->set_has_unsafe_access(true);
}

I don't see any reason that we need the "Object" suffix.

Maybe we can file a follow-up issue to investigate if it's indeed unnecessary now.

TheRealMDoerr · 2021-06-30T09:15:41Z

Unsafe{Get,Put} sound good to me. I'd appreciate the change and the removal of the _obj suffix.
Sure. The "unaligned" cleanup was just a remark. It doesn't need to get addressed as part of this change.
Thank you!

y1yang0 · 2021-06-30T11:52:14Z

/summary Replace UnsafeGetRaw with UnsafeGetObject when setting up OSR entry block, and rename Unsafe{Get,Put}Object to Unsafe{Get,Put}

openjdk · 2021-06-30T11:53:17Z

@kelthuzadx Setting summary to Replace UnsafeGetRaw with UnsafeGetObject when setting up OSR entry block, and rename Unsafe{Get,Put}Object to Unsafe{Get,Put}

TheRealMDoerr

Thanks for cleaning this up!

y1yang0 · 2021-07-01T01:38:25Z

/integrate

openjdk · 2021-07-01T01:39:57Z

Going to push as commit d89e630.
Since your change was applied there have been 884 commits pushed to the master branch:

4660f72: 8268870: Remove dead code in metaspaceShared
9def3b0: Merge
9ac63a6: 8262841: Clarify the behavior of PhantomReference::refersTo
aba6c55: 8269703: ProblemList vmTestbase/nsk/jvmti/scenarios/sampling/SP07/sp07t002/TestDescription.java on Windows-X64 with -Xcomp
3e02224: 8269513: Clarify the spec wrt useOldISOCodes system property
0dc65d3: 8268897: [TESTBUG] compiler/compilercontrol/mixed/RandomCommandsTest.java must not fail on Command.quiet
3826012: 8268557: Module page uses unstyled table class
2b17e95: 8269691: ProblemList sun/management/jdp/JdpDefaultsTest.java on Linux-aarch64
1da5d4b: 8269486: CallerAccessTest fails for non server variant
be0ac92: 8269614: [s390] Interpreter checks wrong bit for slow path instance allocation
... and 874 more: https://git.openjdk.java.net/jdk/compare/80941f475f7f3bd479f1ab75287f0ffe7935ad05...master

Your commit was automatically rebased without conflicts.

openjdk · 2021-07-01T01:40:12Z

@kelthuzadx Pushed as commit d89e630.

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

cleanup

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unaliged_move for ppc/s390

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many nit

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remove unaligned assert

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cleanup; rename Unsafe{Get,Put}Object to Unsafe{Get,Put}

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y1yang0 changed the title ~~8266746: C1: Replace UnsafeGetRaw with UnsafeGetObject when setting up OSR entry block~~ 8266746: C1: Replace UnsafeGetRaw with UnsafeGet when setting up OSR entry block Jun 30, 2021

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8269672: C1: Remove unaligned move on all architectures #4662

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8266746: C1: Replace UnsafeGetRaw with UnsafeGet when setting up OSR entry block #3917

8266746: C1: Replace UnsafeGetRaw with UnsafeGet when setting up OSR entry block #3917

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	for_each_local_value(state, index, local) {
	int offset = locals_offset - (index + local->type()->size() - 1) * BytesPerWord;
	Value get;
	if (local->type()->is_object_kind() && !live_oops.at(index)) {
	// The interpreter thinks this local is dead but the compiler
	// doesn't so pretend that the interpreter passed in null.
	get = append(new Constant(objectNull));
	} else {
	get = append(new UnsafeGetRaw(as_BasicType(local->type()), e,
	append(new Constant(new IntConstant(offset))),
	0,
	true /unaligned/, true /wide/));
	}
	_state->store_local(index, get);
	}

8266746: C1: Replace UnsafeGetRaw with UnsafeGet when setting up OSR entry block #3917

8266746: C1: Replace UnsafeGetRaw with UnsafeGet when setting up OSR entry block #3917

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