https://www.graalvm.org/ 
final class com.oracle.svm.core.genscavenge.GreyToBlackObjectVisitor implements com.oracle.svm.core.heap.ObjectVisitor
  minor version: 0
  major version: 59
  flags: flags: (0x0030) ACC_FINAL, ACC_SUPER
  this_class: com.oracle.svm.core.genscavenge.GreyToBlackObjectVisitor
  super_class: java.lang.Object
{
  private final com.oracle.svm.core.genscavenge.GreyToBlackObjectVisitor$DiagnosticReporter diagnosticReporter;
    descriptor: Lcom/oracle/svm/core/genscavenge/GreyToBlackObjectVisitor$DiagnosticReporter;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  private final com.oracle.svm.core.genscavenge.GreyToBlackObjRefVisitor objRefVisitor;
    descriptor: Lcom/oracle/svm/core/genscavenge/GreyToBlackObjRefVisitor;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  void <init>(com.oracle.svm.core.genscavenge.GreyToBlackObjRefVisitor);
    descriptor: (Lcom/oracle/svm/core/genscavenge/GreyToBlackObjRefVisitor;)V
    flags: (0x0000) 
    Code:
      stack=3, locals=2, args_size=2
        start local 0 // com.oracle.svm.core.genscavenge.GreyToBlackObjectVisitor this
        start local 1 // com.oracle.svm.core.genscavenge.GreyToBlackObjRefVisitor greyToBlackObjRefVisitor
         0: .line 60
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 61
            aload 0 /* this */
            aload 1 /* greyToBlackObjRefVisitor */
            putfield com.oracle.svm.core.genscavenge.GreyToBlackObjectVisitor.objRefVisitor:Lcom/oracle/svm/core/genscavenge/GreyToBlackObjRefVisitor;
         2: .line 62
            invokestatic com.oracle.svm.core.genscavenge.GreyToBlackObjectVisitor$DiagnosticReporter.getHistoryLength:()I
            ifle 6
         3: .line 63
            aload 0 /* this */
            new com.oracle.svm.core.genscavenge.GreyToBlackObjectVisitor$DiagnosticReporter
            dup
            invokespecial com.oracle.svm.core.genscavenge.GreyToBlackObjectVisitor$DiagnosticReporter.<init>:()V
            putfield com.oracle.svm.core.genscavenge.GreyToBlackObjectVisitor.diagnosticReporter:Lcom/oracle/svm/core/genscavenge/GreyToBlackObjectVisitor$DiagnosticReporter;
         4: .line 64
            invokestatic com.oracle.svm.core.SubstrateUtil$DiagnosticThunkRegister.getSingleton:()Lcom/oracle/svm/core/SubstrateUtil$DiagnosticThunkRegister;
            aload 0 /* this */
            getfield com.oracle.svm.core.genscavenge.GreyToBlackObjectVisitor.diagnosticReporter:Lcom/oracle/svm/core/genscavenge/GreyToBlackObjectVisitor$DiagnosticReporter;
            invokevirtual com.oracle.svm.core.SubstrateUtil$DiagnosticThunkRegister.register:(Lcom/oracle/svm/core/SubstrateUtil$DiagnosticThunk;)V
         5: .line 65
            goto 7
         6: .line 66
      StackMap locals: com.oracle.svm.core.genscavenge.GreyToBlackObjectVisitor com.oracle.svm.core.genscavenge.GreyToBlackObjRefVisitor
      StackMap stack:
            aload 0 /* this */
            aconst_null
            putfield com.oracle.svm.core.genscavenge.GreyToBlackObjectVisitor.diagnosticReporter:Lcom/oracle/svm/core/genscavenge/GreyToBlackObjectVisitor$DiagnosticReporter;
         7: .line 68
      StackMap locals:
      StackMap stack:
            return
        end local 1 // com.oracle.svm.core.genscavenge.GreyToBlackObjRefVisitor greyToBlackObjRefVisitor
        end local 0 // com.oracle.svm.core.genscavenge.GreyToBlackObjectVisitor this
      LocalVariableTable:
        Start  End  Slot                      Name  Signature
            0    8     0                      this  Lcom/oracle/svm/core/genscavenge/GreyToBlackObjectVisitor;
            0    8     1  greyToBlackObjRefVisitor  Lcom/oracle/svm/core/genscavenge/GreyToBlackObjRefVisitor;
    RuntimeVisibleAnnotations: 
      org.graalvm.nativeimage.Platforms(value = {Lorg/graalvm/nativeimage/Platform$HOSTED_ONLY;})
    MethodParameters:
                          Name  Flags
      greyToBlackObjRefVisitor  

  public void reset();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.oracle.svm.core.genscavenge.GreyToBlackObjectVisitor this
         0: .line 71
            aload 0 /* this */
            getfield com.oracle.svm.core.genscavenge.GreyToBlackObjectVisitor.diagnosticReporter:Lcom/oracle/svm/core/genscavenge/GreyToBlackObjectVisitor$DiagnosticReporter;
            ifnull 2
         1: .line 72
            aload 0 /* this */
            getfield com.oracle.svm.core.genscavenge.GreyToBlackObjectVisitor.diagnosticReporter:Lcom/oracle/svm/core/genscavenge/GreyToBlackObjectVisitor$DiagnosticReporter;
            invokevirtual com.oracle.svm.core.genscavenge.GreyToBlackObjectVisitor$DiagnosticReporter.reset:()V
         2: .line 74
      StackMap locals:
      StackMap stack:
            return
        end local 0 // com.oracle.svm.core.genscavenge.GreyToBlackObjectVisitor this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lcom/oracle/svm/core/genscavenge/GreyToBlackObjectVisitor;

  public boolean visitObject(java.lang.Object);
    descriptor: (Ljava/lang/Object;)Z
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=2, args_size=2
        start local 0 // com.oracle.svm.core.genscavenge.GreyToBlackObjectVisitor this
        start local 1 // java.lang.Object o
         0: .line 79
            ldc "For performance reasons, this should not be called."
            invokestatic com.oracle.svm.core.util.VMError.shouldNotReachHere:(Ljava/lang/String;)Ljava/lang/RuntimeException;
            athrow
        end local 1 // java.lang.Object o
        end local 0 // com.oracle.svm.core.genscavenge.GreyToBlackObjectVisitor this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/svm/core/genscavenge/GreyToBlackObjectVisitor;
            0    1     1     o  Ljava/lang/Object;
    RuntimeVisibleAnnotations: 
      com.oracle.svm.core.annotate.NeverInline(value = "Non-performance critical version")
    MethodParameters:
      Name  Flags
      o     

  public boolean visitObjectInline(java.lang.Object);
    descriptor: (Ljava/lang/Object;)Z
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.oracle.svm.core.genscavenge.GreyToBlackObjectVisitor this
        start local 1 // java.lang.Object o
         0: .line 85
            aload 0 /* this */
            getfield com.oracle.svm.core.genscavenge.GreyToBlackObjectVisitor.diagnosticReporter:Lcom/oracle/svm/core/genscavenge/GreyToBlackObjectVisitor$DiagnosticReporter;
            ifnull 2
         1: .line 86
            aload 0 /* this */
            getfield com.oracle.svm.core.genscavenge.GreyToBlackObjectVisitor.diagnosticReporter:Lcom/oracle/svm/core/genscavenge/GreyToBlackObjectVisitor$DiagnosticReporter;
            aload 1 /* o */
            invokevirtual com.oracle.svm.core.genscavenge.GreyToBlackObjectVisitor$DiagnosticReporter.noteObject:(Ljava/lang/Object;)V
         2: .line 88
      StackMap locals:
      StackMap stack:
            aload 1 /* o */
            aload 0 /* this */
            getfield com.oracle.svm.core.genscavenge.GreyToBlackObjectVisitor.objRefVisitor:Lcom/oracle/svm/core/genscavenge/GreyToBlackObjRefVisitor;
            invokestatic com.oracle.svm.core.genscavenge.ReferenceObjectProcessing.discoverIfReference:(Ljava/lang/Object;Lcom/oracle/svm/core/heap/ObjectReferenceVisitor;)V
         3: .line 89
            aload 1 /* o */
            aload 0 /* this */
            getfield com.oracle.svm.core.genscavenge.GreyToBlackObjectVisitor.objRefVisitor:Lcom/oracle/svm/core/genscavenge/GreyToBlackObjRefVisitor;
            invokestatic com.oracle.svm.core.hub.InteriorObjRefWalker.walkObjectInline:(Ljava/lang/Object;Lcom/oracle/svm/core/heap/ObjectReferenceVisitor;)Z
            pop
         4: .line 90
            iconst_1
            ireturn
        end local 1 // java.lang.Object o
        end local 0 // com.oracle.svm.core.genscavenge.GreyToBlackObjectVisitor this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    5     0  this  Lcom/oracle/svm/core/genscavenge/GreyToBlackObjectVisitor;
            0    5     1     o  Ljava/lang/Object;
    RuntimeVisibleAnnotations: 
      com.oracle.svm.core.annotate.AlwaysInline(value = "GC performance")
    MethodParameters:
      Name  Flags
      o     
}
SourceFile: "GreyToBlackObjectVisitor.java"
NestMembers:
  com.oracle.svm.core.genscavenge.GreyToBlackObjectVisitor$DiagnosticReporter  com.oracle.svm.core.genscavenge.GreyToBlackObjectVisitor$DiagnosticReporter$Options
InnerClasses:
  public abstract DiagnosticThunk = com.oracle.svm.core.SubstrateUtil$DiagnosticThunk of com.oracle.svm.core.SubstrateUtil
  public DiagnosticThunkRegister = com.oracle.svm.core.SubstrateUtil$DiagnosticThunkRegister of com.oracle.svm.core.SubstrateUtil
  final DiagnosticReporter = com.oracle.svm.core.genscavenge.GreyToBlackObjectVisitor$DiagnosticReporter of com.oracle.svm.core.genscavenge.GreyToBlackObjectVisitor