https://www.graalvm.org/ 
public class com.oracle.truffle.js.nodes.function.DefineMethodNode extends com.oracle.truffle.js.nodes.JavaScriptBaseNode
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: com.oracle.truffle.js.nodes.function.DefineMethodNode
  super_class: com.oracle.truffle.js.nodes.JavaScriptBaseNode
{
  private final com.oracle.truffle.js.runtime.builtins.JSFunctionData functionData;
    descriptor: Lcom/oracle/truffle/js/runtime/builtins/JSFunctionData;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  private com.oracle.truffle.js.nodes.function.DefineMethodNode$FunctionCreateNode functionCreateNode;
    descriptor: Lcom/oracle/truffle/js/nodes/function/DefineMethodNode$FunctionCreateNode;
    flags: (0x0002) ACC_PRIVATE
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.nodes.Node$Child()

  private com.oracle.truffle.js.nodes.access.PropertySetNode makeMethodNode;
    descriptor: Lcom/oracle/truffle/js/nodes/access/PropertySetNode;
    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 61
            ldc Lcom/oracle/truffle/js/nodes/function/DefineMethodNode;
            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.DefineMethodNode.$assertionsDisabled:Z
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  protected void <init>(com.oracle.truffle.js.runtime.JSContext, com.oracle.truffle.js.runtime.builtins.JSFunctionData);
    descriptor: (Lcom/oracle/truffle/js/runtime/JSContext;Lcom/oracle/truffle/js/runtime/builtins/JSFunctionData;)V
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=3, locals=3, args_size=3
        start local 0 // com.oracle.truffle.js.nodes.function.DefineMethodNode this
        start local 1 // com.oracle.truffle.js.runtime.JSContext context
        start local 2 // com.oracle.truffle.js.runtime.builtins.JSFunctionData functionData
         0: .line 67
            aload 0 /* this */
            invokespecial com.oracle.truffle.js.nodes.JavaScriptBaseNode.<init>:()V
         1: .line 68
            aload 0 /* this */
            aload 2 /* functionData */
            putfield com.oracle.truffle.js.nodes.function.DefineMethodNode.functionData:Lcom/oracle/truffle/js/runtime/builtins/JSFunctionData;
         2: .line 69
            aload 0 /* this */
            aload 1 /* context */
            aload 2 /* functionData */
            invokestatic com.oracle.truffle.js.nodes.function.DefineMethodNode$FunctionCreateNode.create:(Lcom/oracle/truffle/js/runtime/JSContext;Lcom/oracle/truffle/js/runtime/builtins/JSFunctionData;)Lcom/oracle/truffle/js/nodes/function/DefineMethodNode$FunctionCreateNode;
            putfield com.oracle.truffle.js.nodes.function.DefineMethodNode.functionCreateNode:Lcom/oracle/truffle/js/nodes/function/DefineMethodNode$FunctionCreateNode;
         3: .line 70
            aload 0 /* this */
            getstatic com.oracle.truffle.js.runtime.builtins.JSFunction.HOME_OBJECT_ID:Lcom/oracle/truffle/api/object/HiddenKey;
            aload 1 /* context */
            invokestatic com.oracle.truffle.js.nodes.access.PropertySetNode.createSetHidden:(Lcom/oracle/truffle/api/object/HiddenKey;Lcom/oracle/truffle/js/runtime/JSContext;)Lcom/oracle/truffle/js/nodes/access/PropertySetNode;
            putfield com.oracle.truffle.js.nodes.function.DefineMethodNode.makeMethodNode:Lcom/oracle/truffle/js/nodes/access/PropertySetNode;
         4: .line 71
            return
        end local 2 // com.oracle.truffle.js.runtime.builtins.JSFunctionData functionData
        end local 1 // com.oracle.truffle.js.runtime.JSContext context
        end local 0 // com.oracle.truffle.js.nodes.function.DefineMethodNode this
      LocalVariableTable:
        Start  End  Slot          Name  Signature
            0    5     0          this  Lcom/oracle/truffle/js/nodes/function/DefineMethodNode;
            0    5     1       context  Lcom/oracle/truffle/js/runtime/JSContext;
            0    5     2  functionData  Lcom/oracle/truffle/js/runtime/builtins/JSFunctionData;
    MethodParameters:
              Name  Flags
      context       
      functionData  

  public static com.oracle.truffle.js.nodes.function.DefineMethodNode create(com.oracle.truffle.js.runtime.JSContext, com.oracle.truffle.js.nodes.function.JSFunctionExpressionNode);
    descriptor: (Lcom/oracle/truffle/js/runtime/JSContext;Lcom/oracle/truffle/js/nodes/function/JSFunctionExpressionNode;)Lcom/oracle/truffle/js/nodes/function/DefineMethodNode;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=4, locals=2, args_size=2
        start local 0 // com.oracle.truffle.js.runtime.JSContext context
        start local 1 // com.oracle.truffle.js.nodes.function.JSFunctionExpressionNode functionExpressionNode
         0: .line 74
            new com.oracle.truffle.js.nodes.function.DefineMethodNode
            dup
            aload 0 /* context */
            aload 1 /* functionExpressionNode */
            getfield com.oracle.truffle.js.nodes.function.JSFunctionExpressionNode.functionData:Lcom/oracle/truffle/js/runtime/builtins/JSFunctionData;
            invokespecial com.oracle.truffle.js.nodes.function.DefineMethodNode.<init>:(Lcom/oracle/truffle/js/runtime/JSContext;Lcom/oracle/truffle/js/runtime/builtins/JSFunctionData;)V
            areturn
        end local 1 // com.oracle.truffle.js.nodes.function.JSFunctionExpressionNode functionExpressionNode
        end local 0 // com.oracle.truffle.js.runtime.JSContext context
      LocalVariableTable:
        Start  End  Slot                    Name  Signature
            0    1     0                 context  Lcom/oracle/truffle/js/runtime/JSContext;
            0    1     1  functionExpressionNode  Lcom/oracle/truffle/js/nodes/function/JSFunctionExpressionNode;
    MethodParameters:
                        Name  Flags
      context                 
      functionExpressionNode  

  public com.oracle.truffle.js.runtime.builtins.JSFunctionData getFunctionData();
    descriptor: ()Lcom/oracle/truffle/js/runtime/builtins/JSFunctionData;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.oracle.truffle.js.nodes.function.DefineMethodNode this
         0: .line 78
            aload 0 /* this */
            getfield com.oracle.truffle.js.nodes.function.DefineMethodNode.functionData:Lcom/oracle/truffle/js/runtime/builtins/JSFunctionData;
            areturn
        end local 0 // com.oracle.truffle.js.nodes.function.DefineMethodNode this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/js/nodes/function/DefineMethodNode;

  public com.oracle.truffle.api.object.DynamicObject execute(com.oracle.truffle.api.frame.VirtualFrame, com.oracle.truffle.api.object.DynamicObject, com.oracle.truffle.api.object.DynamicObject);
    descriptor: (Lcom/oracle/truffle/api/frame/VirtualFrame;Lcom/oracle/truffle/api/object/DynamicObject;Lcom/oracle/truffle/api/object/DynamicObject;)Lcom/oracle/truffle/api/object/DynamicObject;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=5, args_size=4
        start local 0 // com.oracle.truffle.js.nodes.function.DefineMethodNode this
        start local 1 // com.oracle.truffle.api.frame.VirtualFrame frame
        start local 2 // com.oracle.truffle.api.object.DynamicObject homeObject
        start local 3 // com.oracle.truffle.api.object.DynamicObject functionPrototype
         0: .line 82
            getstatic com.oracle.truffle.js.nodes.function.DefineMethodNode.$assertionsDisabled:Z
            ifne 1
            aload 3 /* functionPrototype */
            invokestatic com.oracle.truffle.js.runtime.JSRuntime.isObject:(Ljava/lang/Object;)Z
            ifne 1
            new java.lang.AssertionError
            dup
            invokespecial java.lang.AssertionError.<init>:()V
            athrow
         1: .line 83
      StackMap locals:
      StackMap stack:
            getstatic com.oracle.truffle.js.nodes.function.DefineMethodNode.$assertionsDisabled:Z
            ifne 2
            aload 2 /* homeObject */
            invokestatic com.oracle.truffle.js.runtime.JSRuntime.isObject:(Ljava/lang/Object;)Z
            ifne 2
            new java.lang.AssertionError
            dup
            invokespecial java.lang.AssertionError.<init>:()V
            athrow
         2: .line 84
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield com.oracle.truffle.js.nodes.function.DefineMethodNode.functionCreateNode:Lcom/oracle/truffle/js/nodes/function/DefineMethodNode$FunctionCreateNode;
            aload 1 /* frame */
            aload 3 /* functionPrototype */
            invokevirtual com.oracle.truffle.js.nodes.function.DefineMethodNode$FunctionCreateNode.executeWithPrototype:(Lcom/oracle/truffle/api/frame/VirtualFrame;Ljava/lang/Object;)Lcom/oracle/truffle/api/object/DynamicObject;
            astore 4 /* closure */
        start local 4 // com.oracle.truffle.api.object.DynamicObject closure
         3: .line 85
            aload 0 /* this */
            getfield com.oracle.truffle.js.nodes.function.DefineMethodNode.makeMethodNode:Lcom/oracle/truffle/js/nodes/access/PropertySetNode;
            aload 4 /* closure */
            aload 2 /* homeObject */
            invokevirtual com.oracle.truffle.js.nodes.access.PropertySetNode.setValue:(Ljava/lang/Object;Ljava/lang/Object;)V
         4: .line 86
            aload 4 /* closure */
            areturn
        end local 4 // com.oracle.truffle.api.object.DynamicObject closure
        end local 3 // com.oracle.truffle.api.object.DynamicObject functionPrototype
        end local 2 // com.oracle.truffle.api.object.DynamicObject homeObject
        end local 1 // com.oracle.truffle.api.frame.VirtualFrame frame
        end local 0 // com.oracle.truffle.js.nodes.function.DefineMethodNode this
      LocalVariableTable:
        Start  End  Slot               Name  Signature
            0    5     0               this  Lcom/oracle/truffle/js/nodes/function/DefineMethodNode;
            0    5     1              frame  Lcom/oracle/truffle/api/frame/VirtualFrame;
            0    5     2         homeObject  Lcom/oracle/truffle/api/object/DynamicObject;
            0    5     3  functionPrototype  Lcom/oracle/truffle/api/object/DynamicObject;
            3    5     4            closure  Lcom/oracle/truffle/api/object/DynamicObject;
    MethodParameters:
                   Name  Flags
      frame              
      homeObject         
      functionPrototype  
}
SourceFile: "DefineMethodNode.java"
NestMembers:
  com.oracle.truffle.js.nodes.function.DefineMethodNode$FunctionCreateNode
InnerClasses:
  public abstract Child = com.oracle.truffle.api.nodes.Node$Child of com.oracle.truffle.api.nodes.Node
  protected abstract FunctionCreateNode = com.oracle.truffle.js.nodes.function.DefineMethodNode$FunctionCreateNode of com.oracle.truffle.js.nodes.function.DefineMethodNode