https://www.graalvm.org/ 
public class com.oracle.truffle.js.nodes.function.FunctionBodyNode extends com.oracle.truffle.js.nodes.function.AbstractBodyNode
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: com.oracle.truffle.js.nodes.function.FunctionBodyNode
  super_class: com.oracle.truffle.js.nodes.function.AbstractBodyNode
{
  private com.oracle.truffle.js.nodes.JavaScriptNode body;
    descriptor: Lcom/oracle/truffle/js/nodes/JavaScriptNode;
    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 56
            ldc Lcom/oracle/truffle/js/nodes/function/FunctionBodyNode;
            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.js.nodes.function.FunctionBodyNode.$assertionsDisabled:Z
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  public void <init>(com.oracle.truffle.js.nodes.JavaScriptNode);
    descriptor: (Lcom/oracle/truffle/js/nodes/JavaScriptNode;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.oracle.truffle.js.nodes.function.FunctionBodyNode this
        start local 1 // com.oracle.truffle.js.nodes.JavaScriptNode body
         0: .line 59
            aload 0 /* this */
            invokespecial com.oracle.truffle.js.nodes.function.AbstractBodyNode.<init>:()V
         1: .line 60
            aload 0 /* this */
            aload 1 /* body */
            putfield com.oracle.truffle.js.nodes.function.FunctionBodyNode.body:Lcom/oracle/truffle/js/nodes/JavaScriptNode;
         2: .line 61
            return
        end local 1 // com.oracle.truffle.js.nodes.JavaScriptNode body
        end local 0 // com.oracle.truffle.js.nodes.function.FunctionBodyNode this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lcom/oracle/truffle/js/nodes/function/FunctionBodyNode;
            0    3     1  body  Lcom/oracle/truffle/js/nodes/JavaScriptNode;
    MethodParameters:
      Name  Flags
      body  

  public static com.oracle.truffle.js.nodes.function.FunctionBodyNode create(com.oracle.truffle.js.nodes.JavaScriptNode);
    descriptor: (Lcom/oracle/truffle/js/nodes/JavaScriptNode;)Lcom/oracle/truffle/js/nodes/function/FunctionBodyNode;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // com.oracle.truffle.js.nodes.JavaScriptNode body
         0: .line 64
            new com.oracle.truffle.js.nodes.function.FunctionBodyNode
            dup
            aload 0 /* body */
            invokespecial com.oracle.truffle.js.nodes.function.FunctionBodyNode.<init>:(Lcom/oracle/truffle/js/nodes/JavaScriptNode;)V
            areturn
        end local 0 // com.oracle.truffle.js.nodes.JavaScriptNode body
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  body  Lcom/oracle/truffle/js/nodes/JavaScriptNode;
    MethodParameters:
      Name  Flags
      body  

  public com.oracle.truffle.js.nodes.JavaScriptNode getBody();
    descriptor: ()Lcom/oracle/truffle/js/nodes/JavaScriptNode;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.oracle.truffle.js.nodes.function.FunctionBodyNode this
         0: .line 68
            aload 0 /* this */
            getfield com.oracle.truffle.js.nodes.function.FunctionBodyNode.body:Lcom/oracle/truffle/js/nodes/JavaScriptNode;
            areturn
        end local 0 // com.oracle.truffle.js.nodes.function.FunctionBodyNode this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/js/nodes/function/FunctionBodyNode;

  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=2, args_size=2
        start local 0 // com.oracle.truffle.js.nodes.function.FunctionBodyNode this
        start local 1 // com.oracle.truffle.api.frame.VirtualFrame frame
         0: .line 73
            aload 0 /* this */
            getfield com.oracle.truffle.js.nodes.function.FunctionBodyNode.body:Lcom/oracle/truffle/js/nodes/JavaScriptNode;
            aload 1 /* frame */
            invokevirtual com.oracle.truffle.js.nodes.JavaScriptNode.execute:(Lcom/oracle/truffle/api/frame/VirtualFrame;)Ljava/lang/Object;
            areturn
        end local 1 // com.oracle.truffle.api.frame.VirtualFrame frame
        end local 0 // com.oracle.truffle.js.nodes.function.FunctionBodyNode this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    1     0   this  Lcom/oracle/truffle/js/nodes/function/FunctionBodyNode;
            0    1     1  frame  Lcom/oracle/truffle/api/frame/VirtualFrame;
    MethodParameters:
       Name  Flags
      frame  

  protected com.oracle.truffle.js.nodes.JavaScriptNode copyUninitialized(java.util.Set<java.lang.Class<? extends com.oracle.truffle.api.instrumentation.Tag>>);
    descriptor: (Ljava/util/Set;)Lcom/oracle/truffle/js/nodes/JavaScriptNode;
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.oracle.truffle.js.nodes.function.FunctionBodyNode this
        start local 1 // java.util.Set materializedTags
         0: .line 78
            aload 0 /* this */
            getfield com.oracle.truffle.js.nodes.function.FunctionBodyNode.body:Lcom/oracle/truffle/js/nodes/JavaScriptNode;
            aload 1 /* materializedTags */
            invokestatic com.oracle.truffle.js.nodes.function.FunctionBodyNode.cloneUninitialized:(Lcom/oracle/truffle/js/nodes/JavaScriptNode;Ljava/util/Set;)Lcom/oracle/truffle/js/nodes/JavaScriptNode;
            invokestatic com.oracle.truffle.js.nodes.function.FunctionBodyNode.create:(Lcom/oracle/truffle/js/nodes/JavaScriptNode;)Lcom/oracle/truffle/js/nodes/function/FunctionBodyNode;
            areturn
        end local 1 // java.util.Set materializedTags
        end local 0 // com.oracle.truffle.js.nodes.function.FunctionBodyNode this
      LocalVariableTable:
        Start  End  Slot              Name  Signature
            0    1     0              this  Lcom/oracle/truffle/js/nodes/function/FunctionBodyNode;
            0    1     1  materializedTags  Ljava/util/Set<Ljava/lang/Class<+Lcom/oracle/truffle/api/instrumentation/Tag;>;>;
    Signature: (Ljava/util/Set<Ljava/lang/Class<+Lcom/oracle/truffle/api/instrumentation/Tag;>;>;)Lcom/oracle/truffle/js/nodes/JavaScriptNode;
    MethodParameters:
                  Name  Flags
      materializedTags  

  public com.oracle.truffle.api.instrumentation.InstrumentableNode materializeInstrumentableNodes(java.util.Set<java.lang.Class<? extends com.oracle.truffle.api.instrumentation.Tag>>);
    descriptor: (Ljava/util/Set;)Lcom/oracle/truffle/api/instrumentation/InstrumentableNode;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=4, args_size=2
        start local 0 // com.oracle.truffle.js.nodes.function.FunctionBodyNode this
        start local 1 // java.util.Set materializedTags
         0: .line 83
            aload 1 /* materializedTags */
            ldc Lcom/oracle/truffle/js/nodes/instrumentation/JSTags$DeclareTag;
            invokeinterface java.util.Set.contains:(Ljava/lang/Object;)Z
            ifeq 6
            aload 0 /* this */
            invokestatic com.oracle.truffle.js.nodes.instrumentation.DeclareTagProvider.isMaterializedFrameProvider:(Lcom/oracle/truffle/js/nodes/JavaScriptNode;)Z
            ifne 6
         1: .line 84
            getstatic com.oracle.truffle.js.nodes.function.FunctionBodyNode.$assertionsDisabled:Z
            ifne 2
            aload 0 /* this */
            invokevirtual com.oracle.truffle.js.nodes.function.FunctionBodyNode.getRootNode:()Lcom/oracle/truffle/api/nodes/RootNode;
            instanceof com.oracle.truffle.js.nodes.function.FunctionRootNode
            ifne 2
            new java.lang.AssertionError
            dup
            ldc "Malformed AST"
            invokespecial java.lang.AssertionError.<init>:(Ljava/lang/Object;)V
            athrow
         2: .line 85
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            invokevirtual com.oracle.truffle.js.nodes.function.FunctionBodyNode.getRootNode:()Lcom/oracle/truffle/api/nodes/RootNode;
            invokevirtual com.oracle.truffle.api.nodes.RootNode.getFrameDescriptor:()Lcom/oracle/truffle/api/frame/FrameDescriptor;
            astore 2 /* frameDescriptor */
        start local 2 // com.oracle.truffle.api.frame.FrameDescriptor frameDescriptor
         3: .line 86
            aload 0 /* this */
            getfield com.oracle.truffle.js.nodes.function.FunctionBodyNode.body:Lcom/oracle/truffle/js/nodes/JavaScriptNode;
            aload 1 /* materializedTags */
            invokestatic com.oracle.truffle.js.nodes.function.FunctionBodyNode.cloneUninitialized:(Lcom/oracle/truffle/js/nodes/JavaScriptNode;Ljava/util/Set;)Lcom/oracle/truffle/js/nodes/JavaScriptNode;
            aload 0 /* this */
            invokevirtual com.oracle.truffle.js.nodes.function.FunctionBodyNode.getSourceSection:()Lcom/oracle/truffle/api/source/SourceSection;
            aload 2 /* frameDescriptor */
            invokestatic com.oracle.truffle.js.nodes.instrumentation.DeclareTagProvider.createMaterializedFunctionBodyNode:(Lcom/oracle/truffle/js/nodes/JavaScriptNode;Lcom/oracle/truffle/api/source/SourceSection;Lcom/oracle/truffle/api/frame/FrameDescriptor;)Lcom/oracle/truffle/js/nodes/JavaScriptNode;
            astore 3 /* materialized */
        start local 3 // com.oracle.truffle.js.nodes.JavaScriptNode materialized
         4: .line 87
            aload 3 /* materialized */
            aload 0 /* this */
            invokevirtual com.oracle.truffle.js.nodes.function.FunctionBodyNode.getSourceSection:()Lcom/oracle/truffle/api/source/SourceSection;
            invokevirtual com.oracle.truffle.js.nodes.JavaScriptNode.setSourceSection:(Lcom/oracle/truffle/api/source/SourceSection;)V
         5: .line 88
            aload 3 /* materialized */
            areturn
        end local 3 // com.oracle.truffle.js.nodes.JavaScriptNode materialized
        end local 2 // com.oracle.truffle.api.frame.FrameDescriptor frameDescriptor
         6: .line 90
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            areturn
        end local 1 // java.util.Set materializedTags
        end local 0 // com.oracle.truffle.js.nodes.function.FunctionBodyNode this
      LocalVariableTable:
        Start  End  Slot              Name  Signature
            0    7     0              this  Lcom/oracle/truffle/js/nodes/function/FunctionBodyNode;
            0    7     1  materializedTags  Ljava/util/Set<Ljava/lang/Class<+Lcom/oracle/truffle/api/instrumentation/Tag;>;>;
            3    6     2   frameDescriptor  Lcom/oracle/truffle/api/frame/FrameDescriptor;
            4    6     3      materialized  Lcom/oracle/truffle/js/nodes/JavaScriptNode;
    Signature: (Ljava/util/Set<Ljava/lang/Class<+Lcom/oracle/truffle/api/instrumentation/Tag;>;>;)Lcom/oracle/truffle/api/instrumentation/InstrumentableNode;
    MethodParameters:
                  Name  Flags
      materializedTags  
}
SourceFile: "FunctionBodyNode.java"
InnerClasses:
  public abstract Child = com.oracle.truffle.api.nodes.Node$Child of com.oracle.truffle.api.nodes.Node
  public final DeclareTag = com.oracle.truffle.js.nodes.instrumentation.JSTags$DeclareTag of com.oracle.truffle.js.nodes.instrumentation.JSTags
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.nodes.NodeInfo(cost = com.oracle.truffle.api.nodes.NodeCost.NONE:Lcom/oracle/truffle/api/nodes/NodeCost;)