https://www.graalvm.org/ 
final class com.oracle.truffle.st.CoverageNode extends com.oracle.truffle.api.instrumentation.ExecutionEventNode
  minor version: 0
  major version: 59
  flags: flags: (0x0030) ACC_FINAL, ACC_SUPER
  this_class: com.oracle.truffle.st.CoverageNode
  super_class: com.oracle.truffle.api.instrumentation.ExecutionEventNode
{
  private final com.oracle.truffle.st.SimpleCoverageInstrument instrument;
    descriptor: Lcom/oracle/truffle/st/SimpleCoverageInstrument;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  private boolean covered;
    descriptor: Z
    flags: (0x0002) ACC_PRIVATE
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.CompilerDirectives$CompilationFinal()

  private final com.oracle.truffle.api.source.SourceSection instrumentedSourceSection;
    descriptor: Lcom/oracle/truffle/api/source/SourceSection;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  void <init>(com.oracle.truffle.st.SimpleCoverageInstrument, com.oracle.truffle.api.source.SourceSection);
    descriptor: (Lcom/oracle/truffle/st/SimpleCoverageInstrument;Lcom/oracle/truffle/api/source/SourceSection;)V
    flags: (0x0000) 
    Code:
      stack=2, locals=3, args_size=3
        start local 0 // com.oracle.truffle.st.CoverageNode this
        start local 1 // com.oracle.truffle.st.SimpleCoverageInstrument instrument
        start local 2 // com.oracle.truffle.api.source.SourceSection instrumentedSourceSection
         0: .line 67
            aload 0 /* this */
            invokespecial com.oracle.truffle.api.instrumentation.ExecutionEventNode.<init>:()V
         1: .line 68
            aload 0 /* this */
            aload 1 /* instrument */
            putfield com.oracle.truffle.st.CoverageNode.instrument:Lcom/oracle/truffle/st/SimpleCoverageInstrument;
         2: .line 69
            aload 0 /* this */
            aload 2 /* instrumentedSourceSection */
            putfield com.oracle.truffle.st.CoverageNode.instrumentedSourceSection:Lcom/oracle/truffle/api/source/SourceSection;
         3: .line 70
            return
        end local 2 // com.oracle.truffle.api.source.SourceSection instrumentedSourceSection
        end local 1 // com.oracle.truffle.st.SimpleCoverageInstrument instrument
        end local 0 // com.oracle.truffle.st.CoverageNode this
      LocalVariableTable:
        Start  End  Slot                       Name  Signature
            0    4     0                       this  Lcom/oracle/truffle/st/CoverageNode;
            0    4     1                 instrument  Lcom/oracle/truffle/st/SimpleCoverageInstrument;
            0    4     2  instrumentedSourceSection  Lcom/oracle/truffle/api/source/SourceSection;
    MethodParameters:
                           Name  Flags
      instrument                 
      instrumentedSourceSection  

  public void onReturnValue(com.oracle.truffle.api.frame.VirtualFrame, java.lang.Object);
    descriptor: (Lcom/oracle/truffle/api/frame/VirtualFrame;Ljava/lang/Object;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=3, args_size=3
        start local 0 // com.oracle.truffle.st.CoverageNode this
        start local 1 // com.oracle.truffle.api.frame.VirtualFrame vFrame
        start local 2 // java.lang.Object result
         0: .line 107
            aload 0 /* this */
            getfield com.oracle.truffle.st.CoverageNode.covered:Z
            ifne 4
         1: .line 108
            invokestatic com.oracle.truffle.api.CompilerDirectives.transferToInterpreterAndInvalidate:()V
         2: .line 109
            aload 0 /* this */
            iconst_1
            putfield com.oracle.truffle.st.CoverageNode.covered:Z
         3: .line 110
            aload 0 /* this */
            getfield com.oracle.truffle.st.CoverageNode.instrument:Lcom/oracle/truffle/st/SimpleCoverageInstrument;
            aload 0 /* this */
            getfield com.oracle.truffle.st.CoverageNode.instrumentedSourceSection:Lcom/oracle/truffle/api/source/SourceSection;
            invokevirtual com.oracle.truffle.st.SimpleCoverageInstrument.addCovered:(Lcom/oracle/truffle/api/source/SourceSection;)V
         4: .line 112
      StackMap locals:
      StackMap stack:
            return
        end local 2 // java.lang.Object result
        end local 1 // com.oracle.truffle.api.frame.VirtualFrame vFrame
        end local 0 // com.oracle.truffle.st.CoverageNode this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    5     0    this  Lcom/oracle/truffle/st/CoverageNode;
            0    5     1  vFrame  Lcom/oracle/truffle/api/frame/VirtualFrame;
            0    5     2  result  Ljava/lang/Object;
    MethodParameters:
        Name  Flags
      vFrame  
      result  
}
SourceFile: "CoverageNode.java"
InnerClasses:
  public abstract CompilationFinal = com.oracle.truffle.api.CompilerDirectives$CompilationFinal of com.oracle.truffle.api.CompilerDirectives