OffHeap CardMarking using the baseObj instead of dataAddr

[rmnattas]

When evaluating Unsafe.CAS, the card marking uses the dstObj to calculate the card entry to dirty.

With OffHeap the dstObj is a dataAddrPointer load of the baseObj:

n85n      NULLCHK on n87n [#32]
n86n        icall  jdk/internal/misc/Unsafe.compareAndSetObject(Ljava/lang/Object;JLjava/lang/Object;Ljava/lang/Object;)Z[#415  final native virtual Method -304]
n87n          aload  java/util/concurrent/ConcurrentHashMap.U Ljdk/internal/misc/Unsafe;[#407  final Static]
n92n          aloadi  <contiguousArrayDataAddrFieldSymbol>[#352  final Shadow +16] 
n88n            aload  tab<parm 0 [Ljava/util/concurrent/ConcurrentHashMap$Node;>[#403  Parm]
n13n          ladd                                 
n9n             lshl                               
n6n               i2l                              
n5n                 iload  i<parm 1 I>[#404  Parm] 
n7n               iconst 3 (X!=0 X>=0 )            
n12n            i2l                                
n10n              iconst 0 (X==0 X>=0 X<=0 )         
n90n          aload  c<parm 2 Ljava/util/concurrent/ConcurrentHashMap$Node;>[#405  Parm]
n91n          aload  v<parm 3 Ljava/util/concurrent/ConcurrentHashMap$Node;>[#406  Parm]

This PR changes that to use the correct baseObj to calculate the card entry to dirty.
The change uses the temp registers to not use more registers for the code sequence.

TODO:

• Z
  • inlineConcurrentLinkedQueueTMOffer (Given that the dstObj is not an array, no dataAddr load will be present)
  • inlineConcurrentLinkedQueueTMPoll (Given that the dstObj is not an array, no dataAddr load will be present)
• Confirm that arraycopyEvaluator needs the change on all platforms [1].

---

[1]
For arraycopy, currently the optimizer uses the baseObj as the dstObj child, and loads the dataAddr in the dstAddr child. As card marking uses the dstObj child for the card entry calculation, it's correct. I just need to confirm that this is always the case.

n60n        arraycopy  java/lang/System.arraycopy(Ljava/lang/Object;ILjava/lang/Object;II)V[#405  unresolved notAccessed static Method] [flags 0x400 0x0 ] (Unsigned forwardArrayCopy noArra>
n58n          aload  <parm 0 [Ljava/lang/Object;>[#403  Parm]                          
n59n          aload  <parm 1 [Ljava/lang/Object;>[#404  Parm]                            
n54n          aloadi  <contiguousArrayDataAddrFieldSymbol>[#352  final Shadow +8] [flags 0x20604 0x0 ] (internalPtr )  [    0x78f0fb0e00a0] bci=[-1,0,20] rc=1 vc=33 vn=- li=- udi=- nc=1 fl>
n55n            aload  <parm 0 [Ljava/lang/Object;>[#403  Parm]                
n56n          aloadi  <contiguousArrayDataAddrFieldSymbol>[#352  final Shadow +8] [flags 0x20604 0x0 ] (internalPtr )  [    0x78f0fb0e0140] bci=[-1,2,20] rc=1 vc=33 vn=- li=- udi=- nc=1 fl>
n57n            aload  <parm 1 [Ljava/lang/Object;>[#404  Parm]                         
n53n          lconst 8 (highWordZero X!=0 X>=0 cannotOverflow )             

[rmnattas]

fyi @zl-wang @hzongaro @r30shah @knn-k

[r30shah]

inlineConcurrentLinkedQueueTM* exploitation is limited to IBM Java 8, I do not think we would have CAS for that, we need to take a look at the tmOffer and tmCall node for that.

[rmnattas]

@r30shah, I don't have a IBM Java 8 with OffHeap to test, but it seem that its not an issue given that the dstObject for inlineConcurrentLinkedQueueTM* is not an array.

The dataAddr load is for arrays, if the dstObject is a ConcurrentLinkedQueue then it won't have a dataAddr load, hence no change necessary, correct?

n269n       icall  java/util/concurrent/ConcurrentLinkedQueue.tmOffer(Ljava/util/concurrent/ConcurrentLinkedQueue$Node;)I[#451  native special Method]
n2405n        aRegLoad GPR8   <parm 0 Ljava/util/concurrent/ConcurrentLinkedQueue;>[#399  Parm]
n255n         new  jitNewObject[#91  helper Method] 
n254n           loadaddr  java/util/concurrent/ConcurrentLinkedQueue$Node[#441  Static] 

Full Instruction Selection

------------------------------
 n270n    (  0)  treetop ()                                                                           [     0x3ff85ab3420] bci=[0,22,346] rc=0 vc=6735 vn=- li=51 udi=- nc=1 flg=0x8
 n269n    (  3)    icall  java/util/concurrent/ConcurrentLinkedQueue.tmOffer(Ljava/util/concurrent/ConcurrentLinkedQueue$Node;)I[#451  native special Method] [flags 0x500 0x0 ] (in GPR_0191) ()  [     0x3ff85ab33d0] bci=[0,22,346] rc=3 vc=6735 vn=- li=51 udi=- nc=2 flg=0x8
 n2405n   (  4)      ==>aRegLoad (in &GPR_0112) (X!=0 X>=0 SeenRealReference )
 n255n    (  3)      ==>new (in &GPR_0146) (highWordZero Unsigned X!=0 allocationCanBeRemoved )
------------------------------

 [     0x3ff86717850]                          LHI     GPR_0191,0x1     
 [     0x3ff86717ab0]                          TBEGINC #629 0,0xff00
 [     0x3ff86717b90]                          NIAI    1,0      
 [     0x3ff86717d20]                          LLGF    &GPR_0192,#630 12(&GPR_0112)
 [     0x3ff86717df0]                          NIAI    1,0      
 [     0x3ff86717f80]                          LT      &GPR_0193,#631 12(&GPR_0192)
 [     0x3ff86718050]                          LLGFR   &GPR_0193,&GPR_0193      
 [     0x3ff86718130]                          BRC     BH(0x8), Label L0119     
 [     0x3ff86718210]                          LGR     &GPR_0192,&GPR_0193      
 [     0x3ff867182f0]                          NIAI    1,0      
 [     0x3ff86718480]                          LT      &GPR_0193,#632 12(&GPR_0192)
 [     0x3ff86718550]                          LLGFR   &GPR_0193,&GPR_0193      
 [     0x3ff86718630]                          BRC     BH(0x8), Label L0119     
 [     0x3ff86718710]                          BRC     NOP(0xf), Label L0120    
 [     0x3ff867187f0]                          Label L0119:     
 [     0x3ff86718990]                          ST      &GPR_0146,#633 12(&GPR_0192)
 [     0x3ff86718b20]                          ST      &GPR_0146,#634 12(&GPR_0112)
 [     0x3ff86718bf0]                          XR      GPR_0191,GPR_0191        
 [     0x3ff86719290]                          assocreg
 [     0x3ff86718cd0]                          Label L0120:     
 POST:
 {AssignAny:GPR_0191:R} {AssignAny:&GPR_0112:R} {AssignAny:&GPR_0192:R} {AssignAny:&GPR_0193:R} {AssignAny:&GPR_0146:R}
 [     0x3ff86719420]                          TEND    #635 0(GPR0)
 [     0x3ff86719720]                          LTR     GPR_0191,GPR_0191        
 [     0x3ff86719800]                          BRC     BNH(0x6), Label L0122    
 [     0x3ff86719ac0]                          LGR     GPR_0194,&GPR_0192       
 [     0x3ff86719ba0]                          SG      GPR_0194,#636 208(GPR13)
 [     0x3ff86719c70]                          CLG     GPR_0194,#637 216(GPR13)
 [     0x3ff86719d40]                          BRC     BL(0x2), Label L0122     
 [     0x3ff86719fa0]                          TM      #638 413(GPR13), 0x10
 [     0x3ff8671a080]                          BRC     BH(0x8), Label L0125     
 [     0x3ff8671a160]                          SRLG    GPR_0194,GPR_0194,9
 [     0x3ff8671a300]                          AG      GPR_0194,#639 192(GPR13)
 [     0x3ff8671a490]                          MVI     #640 0(GPR_0194), 0x01
 [     0x3ff8671ab30]                          assocreg
 [     0x3ff8671a570]                          Label L0125:     
 POST:
 {GPR1:&GPR_0192:R} {GPR2:&GPR_0146:R} {GPR4:GPR_0194:R} {GPR14:GPR_0195:R} {AssignAny:GPR_0191:R}
 [     0x3ff8671b1c0]                          assocreg
 [     0x3ff8671ac00]                          Label L0124:     
 POST:
 {GPR1:&GPR_0192:R} {GPR2:&GPR_0146:R} {GPR4:GPR_0194:R} {GPR14:GPR_0195:R} {AssignAny:GPR_0191:R}
 [     0x3ff8671b350]                          TM      #641 3(&GPR_0192), 0xf0
 [     0x3ff8671b430]                          BRC     MASK9(0x8), Snippet Label L0123  
 [     0x3ff8671bb40]                          assocreg
 [     0x3ff8671b580]                          Label L0122:     
 POST:
 {GPR1:&GPR_0192:R} {GPR2:&GPR_0146:R} {GPR4:GPR_0194:R} {GPR14:GPR_0195:R} {AssignAny:GPR_0191:R}
 [     0x3ff8671be30]                          LTR     GPR_0191,GPR_0191        
 [     0x3ff8671bf10]                          BRC     BNH(0x6), Label L0126    
 [     0x3ff8671c1d0]                          LGR     GPR_0196,&GPR_0112       
 [     0x3ff8671c2b0]                          SG      GPR_0196,#642 208(GPR13)
 [     0x3ff8671c380]                          CLG     GPR_0196,#643 216(GPR13)
 [     0x3ff8671c450]                          BRC     BL(0x2), Label L0126     
 [     0x3ff8671c6b0]                          TM      #644 413(GPR13), 0x10
 [     0x3ff8671c790]                          BRC     BH(0x8), Label L0129     
 [     0x3ff8671c870]                          SRLG    GPR_0196,GPR_0196,9
 [     0x3ff8671ca10]                          AG      GPR_0196,#645 192(GPR13)
 [     0x3ff8671cba0]                          MVI     #646 0(GPR_0196), 0x01
 [     0x3ff8671d240]                          assocreg
 [     0x3ff8671cc80]                          Label L0129:     
 POST:
 {GPR1:&GPR_0112:R} {GPR2:&GPR_0146:R} {GPR4:GPR_0196:R} {GPR14:GPR_0197:R} {AssignAny:GPR_0191:R}
 [     0x3ff8671d8d0]                          assocreg
 [     0x3ff8671d310]                          Label L0128:     
 POST:
 {GPR1:&GPR_0112:R} {GPR2:&GPR_0146:R} {GPR4:GPR_0196:R} {GPR14:GPR_0197:R} {AssignAny:GPR_0191:R}
 [     0x3ff8671da60]                          TM      #647 3(&GPR_0112), 0xf0
 [     0x3ff8671db40]                          BRC     MASK9(0x8), Snippet Label L0127  
 [     0x3ff8671e250]                          assocreg
 [     0x3ff8671dc90]                          Label L0126:     
 POST:
 {GPR1:&GPR_0112:R} {GPR2:&GPR_0146:R} {GPR4:GPR_0196:R} {GPR14:GPR_0197:R} {AssignAny:GPR_0191:R}