https://www.graalvm.org/ 
class com.oracle.truffle.tools.coverage.CoverageTracker$2 implements com.oracle.truffle.api.instrumentation.ExecutionEventNodeFactory
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: com.oracle.truffle.tools.coverage.CoverageTracker$2
  super_class: java.lang.Object
{
  final com.oracle.truffle.tools.coverage.CoverageTracker this$0;
    descriptor: Lcom/oracle/truffle/tools/coverage/CoverageTracker;
    flags: (0x1010) ACC_FINAL, ACC_SYNTHETIC

  private final com.oracle.truffle.tools.coverage.CoverageTracker$Config val$config;
    descriptor: Lcom/oracle/truffle/tools/coverage/CoverageTracker$Config;
    flags: (0x1012) ACC_PRIVATE, ACC_FINAL, ACC_SYNTHETIC

  void <init>(com.oracle.truffle.tools.coverage.CoverageTracker, com.oracle.truffle.tools.coverage.CoverageTracker$Config);
    descriptor: (Lcom/oracle/truffle/tools/coverage/CoverageTracker;Lcom/oracle/truffle/tools/coverage/CoverageTracker$Config;)V
    flags: (0x0000) 
    Code:
      stack=2, locals=3, args_size=3
        start local 0 // com.oracle.truffle.tools.coverage.CoverageTracker$2 this
         0: .line 279
            aload 0 /* this */
            aload 1
            putfield com.oracle.truffle.tools.coverage.CoverageTracker$2.this$0:Lcom/oracle/truffle/tools/coverage/CoverageTracker;
            aload 0 /* this */
            aload 2
            putfield com.oracle.truffle.tools.coverage.CoverageTracker$2.val$config:Lcom/oracle/truffle/tools/coverage/CoverageTracker$Config;
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // com.oracle.truffle.tools.coverage.CoverageTracker$2 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/tools/coverage/CoverageTracker$2;
    MethodParameters:
            Name  Flags
      this$0      final
      val$config  final

  public com.oracle.truffle.api.instrumentation.ExecutionEventNode create(com.oracle.truffle.api.instrumentation.EventContext);
    descriptor: (Lcom/oracle/truffle/api/instrumentation/EventContext;)Lcom/oracle/truffle/api/instrumentation/ExecutionEventNode;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=3, args_size=2
        start local 0 // com.oracle.truffle.tools.coverage.CoverageTracker$2 this
        start local 1 // com.oracle.truffle.api.instrumentation.EventContext context
         0: .line 282
            aload 1 /* context */
            aload 0 /* this */
            getfield com.oracle.truffle.tools.coverage.CoverageTracker$2.val$config:Lcom/oracle/truffle/tools/coverage/CoverageTracker$Config;
            aload 0 /* this */
            getfield com.oracle.truffle.tools.coverage.CoverageTracker$2.this$0:Lcom/oracle/truffle/tools/coverage/CoverageTracker;
            getfield com.oracle.truffle.tools.coverage.CoverageTracker.noReset:Lcom/oracle/truffle/api/Assumption;
            invokestatic com.oracle.truffle.tools.coverage.CoverageTracker.makeCoverageNode:(Lcom/oracle/truffle/api/instrumentation/EventContext;Lcom/oracle/truffle/tools/coverage/CoverageTracker$Config;Lcom/oracle/truffle/api/Assumption;)Lcom/oracle/truffle/tools/coverage/AbstractCoverageNode;
            astore 2 /* coverageNode */
        start local 2 // com.oracle.truffle.tools.coverage.AbstractCoverageNode coverageNode
         1: .line 283
            aload 0 /* this */
            getfield com.oracle.truffle.tools.coverage.CoverageTracker$2.this$0:Lcom/oracle/truffle/tools/coverage/CoverageTracker;
            aload 2 /* coverageNode */
            invokevirtual com.oracle.truffle.tools.coverage.CoverageTracker.addCoverageNode:(Lcom/oracle/truffle/tools/coverage/AbstractCoverageNode;)V
         2: .line 284
            aload 2 /* coverageNode */
            areturn
        end local 2 // com.oracle.truffle.tools.coverage.AbstractCoverageNode coverageNode
        end local 1 // com.oracle.truffle.api.instrumentation.EventContext context
        end local 0 // com.oracle.truffle.tools.coverage.CoverageTracker$2 this
      LocalVariableTable:
        Start  End  Slot          Name  Signature
            0    3     0          this  Lcom/oracle/truffle/tools/coverage/CoverageTracker$2;
            0    3     1       context  Lcom/oracle/truffle/api/instrumentation/EventContext;
            1    3     2  coverageNode  Lcom/oracle/truffle/tools/coverage/AbstractCoverageNode;
    MethodParameters:
         Name  Flags
      context  
}
SourceFile: "CoverageTracker.java"
EnclosingMethod: com.oracle.truffle.tools.coverage.CoverageTracker.instrumentExecution:(Lcom/oracle/truffle/tools/coverage/CoverageTracker$Config;Lcom/oracle/truffle/api/instrumentation/Instrumenter;Lcom/oracle/truffle/api/instrumentation/SourceSectionFilter;)V
NestHost: com.oracle.truffle.tools.coverage.CoverageTracker
InnerClasses:
  com.oracle.truffle.tools.coverage.CoverageTracker$2
  public Config = com.oracle.truffle.tools.coverage.CoverageTracker$Config of com.oracle.truffle.tools.coverage.CoverageTracker