https://www.graalvm.org/ 
class com.oracle.truffle.api.instrumentation.TruffleInstrument$Env$GuardedExecutableNode extends com.oracle.truffle.api.nodes.ExecutableNode
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: com.oracle.truffle.api.instrumentation.TruffleInstrument$Env$GuardedExecutableNode
  super_class: com.oracle.truffle.api.nodes.ExecutableNode
{
  private final com.oracle.truffle.api.frame.FrameDescriptor frameDescriptor;
    descriptor: Lcom/oracle/truffle/api/frame/FrameDescriptor;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  private com.oracle.truffle.api.nodes.ExecutableNode fragment;
    descriptor: Lcom/oracle/truffle/api/nodes/ExecutableNode;
    flags: (0x0002) ACC_PRIVATE
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.nodes.Node$Child()

  static final boolean $assertionsDisabled;
    descriptor: Z
    flags: (0x1018) ACC_STATIC, ACC_FINAL, ACC_SYNTHETIC

  static void <clinit>();
    descriptor: ()V
    flags: (0x0008) ACC_STATIC
    Code:
      stack=1, locals=0, args_size=0
         0: .line 785
            ldc Lcom/oracle/truffle/api/instrumentation/TruffleInstrument;
            invokevirtual java.lang.Class.desiredAssertionStatus:()Z
            ifne 1
            iconst_1
            goto 2
      StackMap locals:
      StackMap stack:
         1: iconst_0
      StackMap locals:
      StackMap stack: int
         2: putstatic com.oracle.truffle.api.instrumentation.TruffleInstrument$Env$GuardedExecutableNode.$assertionsDisabled:Z
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  void <init>(com.oracle.truffle.api.TruffleLanguage<?>, com.oracle.truffle.api.nodes.ExecutableNode, com.oracle.truffle.api.frame.MaterializedFrame);
    descriptor: (Lcom/oracle/truffle/api/TruffleLanguage;Lcom/oracle/truffle/api/nodes/ExecutableNode;Lcom/oracle/truffle/api/frame/MaterializedFrame;)V
    flags: (0x0000) 
    Code:
      stack=2, locals=4, args_size=4
        start local 0 // com.oracle.truffle.api.instrumentation.TruffleInstrument$Env$GuardedExecutableNode this
        start local 1 // com.oracle.truffle.api.TruffleLanguage languageSPI
        start local 2 // com.oracle.truffle.api.nodes.ExecutableNode fragment
        start local 3 // com.oracle.truffle.api.frame.MaterializedFrame frameLocation
         0: .line 791
            aload 0 /* this */
            aload 1 /* languageSPI */
            invokespecial com.oracle.truffle.api.nodes.ExecutableNode.<init>:(Lcom/oracle/truffle/api/TruffleLanguage;)V
         1: .line 792
            aload 0 /* this */
            aload 3 /* frameLocation */
            ifnull 2
            aload 3 /* frameLocation */
            invokeinterface com.oracle.truffle.api.frame.MaterializedFrame.getFrameDescriptor:()Lcom/oracle/truffle/api/frame/FrameDescriptor;
            goto 3
      StackMap locals: com.oracle.truffle.api.instrumentation.TruffleInstrument$Env$GuardedExecutableNode com.oracle.truffle.api.TruffleLanguage com.oracle.truffle.api.nodes.ExecutableNode com.oracle.truffle.api.frame.MaterializedFrame
      StackMap stack: com.oracle.truffle.api.instrumentation.TruffleInstrument$Env$GuardedExecutableNode
         2: aconst_null
      StackMap locals: com.oracle.truffle.api.instrumentation.TruffleInstrument$Env$GuardedExecutableNode com.oracle.truffle.api.TruffleLanguage com.oracle.truffle.api.nodes.ExecutableNode com.oracle.truffle.api.frame.MaterializedFrame
      StackMap stack: com.oracle.truffle.api.instrumentation.TruffleInstrument$Env$GuardedExecutableNode com.oracle.truffle.api.frame.FrameDescriptor
         3: putfield com.oracle.truffle.api.instrumentation.TruffleInstrument$Env$GuardedExecutableNode.frameDescriptor:Lcom/oracle/truffle/api/frame/FrameDescriptor;
         4: .line 793
            aload 0 /* this */
            aload 2 /* fragment */
            putfield com.oracle.truffle.api.instrumentation.TruffleInstrument$Env$GuardedExecutableNode.fragment:Lcom/oracle/truffle/api/nodes/ExecutableNode;
         5: .line 794
            return
        end local 3 // com.oracle.truffle.api.frame.MaterializedFrame frameLocation
        end local 2 // com.oracle.truffle.api.nodes.ExecutableNode fragment
        end local 1 // com.oracle.truffle.api.TruffleLanguage languageSPI
        end local 0 // com.oracle.truffle.api.instrumentation.TruffleInstrument$Env$GuardedExecutableNode this
      LocalVariableTable:
        Start  End  Slot           Name  Signature
            0    6     0           this  Lcom/oracle/truffle/api/instrumentation/TruffleInstrument$Env$GuardedExecutableNode;
            0    6     1    languageSPI  Lcom/oracle/truffle/api/TruffleLanguage<*>;
            0    6     2       fragment  Lcom/oracle/truffle/api/nodes/ExecutableNode;
            0    6     3  frameLocation  Lcom/oracle/truffle/api/frame/MaterializedFrame;
    Signature: (Lcom/oracle/truffle/api/TruffleLanguage<*>;Lcom/oracle/truffle/api/nodes/ExecutableNode;Lcom/oracle/truffle/api/frame/MaterializedFrame;)V
    MethodParameters:
               Name  Flags
      languageSPI    
      fragment       
      frameLocation  

  public java.lang.Object execute(com.oracle.truffle.api.frame.VirtualFrame);
    descriptor: (Lcom/oracle/truffle/api/frame/VirtualFrame;)Ljava/lang/Object;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=3, args_size=2
        start local 0 // com.oracle.truffle.api.instrumentation.TruffleInstrument$Env$GuardedExecutableNode this
        start local 1 // com.oracle.truffle.api.frame.VirtualFrame frame
         0: .line 798
            getstatic com.oracle.truffle.api.instrumentation.TruffleInstrument$Env$GuardedExecutableNode.$assertionsDisabled:Z
            ifne 1
            aload 0 /* this */
            getfield com.oracle.truffle.api.instrumentation.TruffleInstrument$Env$GuardedExecutableNode.frameDescriptor:Lcom/oracle/truffle/api/frame/FrameDescriptor;
            ifnull 1
            aload 0 /* this */
            getfield com.oracle.truffle.api.instrumentation.TruffleInstrument$Env$GuardedExecutableNode.frameDescriptor:Lcom/oracle/truffle/api/frame/FrameDescriptor;
            aload 1 /* frame */
            invokeinterface com.oracle.truffle.api.frame.VirtualFrame.getFrameDescriptor:()Lcom/oracle/truffle/api/frame/FrameDescriptor;
            if_acmpeq 1
            new java.lang.AssertionError
            dup
            invokespecial java.lang.AssertionError.<init>:()V
            athrow
         1: .line 799
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            invokevirtual com.oracle.truffle.api.instrumentation.TruffleInstrument$Env$GuardedExecutableNode.assureAdopted:()V
         2: .line 800
            aload 0 /* this */
            getfield com.oracle.truffle.api.instrumentation.TruffleInstrument$Env$GuardedExecutableNode.fragment:Lcom/oracle/truffle/api/nodes/ExecutableNode;
            aload 1 /* frame */
            invokevirtual com.oracle.truffle.api.nodes.ExecutableNode.execute:(Lcom/oracle/truffle/api/frame/VirtualFrame;)Ljava/lang/Object;
            astore 2 /* ret */
        start local 2 // java.lang.Object ret
         3: .line 801
            getstatic com.oracle.truffle.api.instrumentation.TruffleInstrument$Env$GuardedExecutableNode.$assertionsDisabled:Z
            ifne 4
            aload 2 /* ret */
            invokestatic com.oracle.truffle.api.instrumentation.TruffleInstrument$Env.checkNullOrInterop:(Ljava/lang/Object;)Z
            ifne 4
            new java.lang.AssertionError
            dup
            invokespecial java.lang.AssertionError.<init>:()V
            athrow
         4: .line 802
      StackMap locals: java.lang.Object
      StackMap stack:
            aload 2 /* ret */
            areturn
        end local 2 // java.lang.Object ret
        end local 1 // com.oracle.truffle.api.frame.VirtualFrame frame
        end local 0 // com.oracle.truffle.api.instrumentation.TruffleInstrument$Env$GuardedExecutableNode this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    5     0   this  Lcom/oracle/truffle/api/instrumentation/TruffleInstrument$Env$GuardedExecutableNode;
            0    5     1  frame  Lcom/oracle/truffle/api/frame/VirtualFrame;
            3    5     2    ret  Ljava/lang/Object;
    MethodParameters:
       Name  Flags
      frame  

  private void assureAdopted();
    descriptor: ()V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // com.oracle.truffle.api.instrumentation.TruffleInstrument$Env$GuardedExecutableNode this
         0: .line 806
            aload 0 /* this */
            invokevirtual com.oracle.truffle.api.instrumentation.TruffleInstrument$Env$GuardedExecutableNode.getParent:()Lcom/oracle/truffle/api/nodes/Node;
            ifnonnull 3
         1: .line 807
            invokestatic com.oracle.truffle.api.CompilerDirectives.transferToInterpreterAndInvalidate:()V
         2: .line 808
            new java.lang.IllegalStateException
            dup
            ldc "Needs to be inserted into the AST before execution."
            invokespecial java.lang.IllegalStateException.<init>:(Ljava/lang/String;)V
            athrow
         3: .line 810
      StackMap locals:
      StackMap stack:
            return
        end local 0 // com.oracle.truffle.api.instrumentation.TruffleInstrument$Env$GuardedExecutableNode this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    4     0  this  Lcom/oracle/truffle/api/instrumentation/TruffleInstrument$Env$GuardedExecutableNode;
}
SourceFile: "TruffleInstrument.java"
NestHost: com.oracle.truffle.api.instrumentation.TruffleInstrument
InnerClasses:
  public final Env = com.oracle.truffle.api.instrumentation.TruffleInstrument$Env of com.oracle.truffle.api.instrumentation.TruffleInstrument
  private GuardedExecutableNode = com.oracle.truffle.api.instrumentation.TruffleInstrument$Env$GuardedExecutableNode of com.oracle.truffle.api.instrumentation.TruffleInstrument$Env
  public abstract Child = com.oracle.truffle.api.nodes.Node$Child of com.oracle.truffle.api.nodes.Node