https://www.graalvm.org/ 
public abstract class com.oracle.truffle.trufflenode.buffer.NIOBufferAccessNode extends com.oracle.truffle.js.nodes.function.JSBuiltinNode
  minor version: 0
  major version: 59
  flags: flags: (0x0421) ACC_PUBLIC, ACC_SUPER, ACC_ABSTRACT
  this_class: com.oracle.truffle.trufflenode.buffer.NIOBufferAccessNode
  super_class: com.oracle.truffle.js.nodes.function.JSBuiltinNode
{
  protected static final java.nio.charset.Charset utf8;
    descriptor: Ljava/nio/charset/Charset;
    flags: (0x001c) ACC_PROTECTED, ACC_STATIC, ACC_FINAL

  protected com.oracle.truffle.js.nodes.access.ArrayBufferViewGetByteLengthNode getLenNode;
    descriptor: Lcom/oracle/truffle/js/nodes/access/ArrayBufferViewGetByteLengthNode;
    flags: (0x0004) ACC_PROTECTED
    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 60
            ldc Lcom/oracle/truffle/trufflenode/buffer/NIOBufferAccessNode;
            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.trufflenode.buffer.NIOBufferAccessNode.$assertionsDisabled:Z
         3: .line 62
            ldc "UTF-8"
            invokestatic java.nio.charset.Charset.forName:(Ljava/lang/String;)Ljava/nio/charset/Charset;
            putstatic com.oracle.truffle.trufflenode.buffer.NIOBufferAccessNode.utf8:Ljava/nio/charset/Charset;
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  public void <init>(com.oracle.truffle.js.runtime.JSContext, com.oracle.truffle.js.nodes.function.JSBuiltin);
    descriptor: (Lcom/oracle/truffle/js/runtime/JSContext;Lcom/oracle/truffle/js/nodes/function/JSBuiltin;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=3, args_size=3
        start local 0 // com.oracle.truffle.trufflenode.buffer.NIOBufferAccessNode this
         0: .line 49
            new java.lang.Error
            dup
            ldc "Unresolved compilation problems: \n\tThe import com.oracle.truffle.js.nodes.access.ArrayBufferViewGetByteLengthNodeGen cannot be resolved\n\tArrayBufferViewGetByteLengthNodeGen cannot be resolved\n"
            invokespecial java.lang.Error.<init>:(Ljava/lang/String;)V
            athrow
        end local 0 // com.oracle.truffle.trufflenode.buffer.NIOBufferAccessNode this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/trufflenode/buffer/NIOBufferAccessNode;
    MethodParameters:
         Name  Flags
      context  
      builtin  

  protected static com.oracle.truffle.api.object.DynamicObject getArrayBuffer(com.oracle.truffle.api.object.DynamicObject);
    descriptor: (Lcom/oracle/truffle/api/object/DynamicObject;)Lcom/oracle/truffle/api/object/DynamicObject;
    flags: (0x000c) ACC_PROTECTED, ACC_STATIC
    Code:
      stack=3, locals=2, args_size=1
        start local 0 // com.oracle.truffle.api.object.DynamicObject target
         0: .line 72
            getstatic com.oracle.truffle.trufflenode.buffer.NIOBufferAccessNode.$assertionsDisabled:Z
            ifne 1
            aload 0 /* target */
            invokestatic com.oracle.truffle.js.runtime.builtins.JSArrayBufferView.isJSArrayBufferView:(Ljava/lang/Object;)Z
            ifne 1
            new java.lang.AssertionError
            dup
            ldc "Target object must be a JSArrayBufferView"
            invokespecial java.lang.AssertionError.<init>:(Ljava/lang/Object;)V
            athrow
         1: .line 73
      StackMap locals:
      StackMap stack:
            aload 0 /* target */
            invokestatic com.oracle.truffle.js.runtime.builtins.JSArrayBufferView.getArrayBuffer:(Lcom/oracle/truffle/api/object/DynamicObject;)Lcom/oracle/truffle/api/object/DynamicObject;
            astore 1 /* arrayBuffer */
        start local 1 // com.oracle.truffle.api.object.DynamicObject arrayBuffer
         2: .line 74
            getstatic com.oracle.truffle.trufflenode.buffer.NIOBufferAccessNode.$assertionsDisabled:Z
            ifne 3
            aload 1 /* arrayBuffer */
            invokestatic com.oracle.truffle.js.runtime.builtins.JSArrayBuffer.isJSDirectArrayBuffer:(Ljava/lang/Object;)Z
            ifne 3
            aload 1 /* arrayBuffer */
            invokestatic com.oracle.truffle.js.runtime.builtins.JSSharedArrayBuffer.isJSSharedArrayBuffer:(Ljava/lang/Object;)Z
            ifne 3
            new java.lang.AssertionError
            dup
            ldc "Target buffer must be a DirectArrayBuffer"
            invokespecial java.lang.AssertionError.<init>:(Ljava/lang/Object;)V
            athrow
         3: .line 75
      StackMap locals: com.oracle.truffle.api.object.DynamicObject
      StackMap stack:
            aload 1 /* arrayBuffer */
            areturn
        end local 1 // com.oracle.truffle.api.object.DynamicObject arrayBuffer
        end local 0 // com.oracle.truffle.api.object.DynamicObject target
      LocalVariableTable:
        Start  End  Slot         Name  Signature
            0    4     0       target  Lcom/oracle/truffle/api/object/DynamicObject;
            2    4     1  arrayBuffer  Lcom/oracle/truffle/api/object/DynamicObject;
    MethodParameters:
        Name  Flags
      target  

  protected static java.nio.ByteBuffer getDirectByteBuffer(com.oracle.truffle.api.object.DynamicObject);
    descriptor: (Lcom/oracle/truffle/api/object/DynamicObject;)Ljava/nio/ByteBuffer;
    flags: (0x000c) ACC_PROTECTED, ACC_STATIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // com.oracle.truffle.api.object.DynamicObject arrayBuffer
         0: .line 79
            aload 0 /* arrayBuffer */
            invokestatic com.oracle.truffle.js.runtime.builtins.JSArrayBuffer.isJSDirectArrayBuffer:(Ljava/lang/Object;)Z
            ifeq 2
         1: .line 80
            aload 0 /* arrayBuffer */
            invokestatic com.oracle.truffle.js.runtime.builtins.JSArrayBuffer.getDirectByteBuffer:(Lcom/oracle/truffle/api/object/DynamicObject;)Ljava/nio/ByteBuffer;
            areturn
         2: .line 82
      StackMap locals:
      StackMap stack:
            getstatic com.oracle.truffle.trufflenode.buffer.NIOBufferAccessNode.$assertionsDisabled:Z
            ifne 3
            aload 0 /* arrayBuffer */
            invokestatic com.oracle.truffle.js.runtime.builtins.JSSharedArrayBuffer.isJSSharedArrayBuffer:(Ljava/lang/Object;)Z
            ifne 3
            new java.lang.AssertionError
            dup
            invokespecial java.lang.AssertionError.<init>:()V
            athrow
         3: .line 83
      StackMap locals:
      StackMap stack:
            aload 0 /* arrayBuffer */
            invokestatic com.oracle.truffle.js.runtime.builtins.JSSharedArrayBuffer.getDirectByteBuffer:(Lcom/oracle/truffle/api/object/DynamicObject;)Ljava/nio/ByteBuffer;
            areturn
        end local 0 // com.oracle.truffle.api.object.DynamicObject arrayBuffer
      LocalVariableTable:
        Start  End  Slot         Name  Signature
            0    4     0  arrayBuffer  Lcom/oracle/truffle/api/object/DynamicObject;
    MethodParameters:
             Name  Flags
      arrayBuffer  

  protected int getOffset(com.oracle.truffle.api.object.DynamicObject);
    descriptor: (Lcom/oracle/truffle/api/object/DynamicObject;)I
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=2, locals=3, args_size=2
        start local 0 // com.oracle.truffle.trufflenode.buffer.NIOBufferAccessNode this
        start local 1 // com.oracle.truffle.api.object.DynamicObject target
         0: .line 88
            aload 1 /* target */
            aload 0 /* this */
            invokevirtual com.oracle.truffle.trufflenode.buffer.NIOBufferAccessNode.getContext:()Lcom/oracle/truffle/js/runtime/JSContext;
            invokestatic com.oracle.truffle.js.runtime.builtins.JSArrayBufferView.getByteOffset:(Lcom/oracle/truffle/api/object/DynamicObject;Lcom/oracle/truffle/js/runtime/JSContext;)I
            istore 2 /* byteOffset */
        start local 2 // int byteOffset
         1: .line 89
            iload 2 /* byteOffset */
            ireturn
        end local 2 // int byteOffset
        end local 1 // com.oracle.truffle.api.object.DynamicObject target
        end local 0 // com.oracle.truffle.trufflenode.buffer.NIOBufferAccessNode this
      LocalVariableTable:
        Start  End  Slot        Name  Signature
            0    2     0        this  Lcom/oracle/truffle/trufflenode/buffer/NIOBufferAccessNode;
            0    2     1      target  Lcom/oracle/truffle/api/object/DynamicObject;
            1    2     2  byteOffset  I
    MethodParameters:
        Name  Flags
      target  

  protected int getLength(com.oracle.truffle.api.object.DynamicObject);
    descriptor: (Lcom/oracle/truffle/api/object/DynamicObject;)I
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.oracle.truffle.trufflenode.buffer.NIOBufferAccessNode this
        start local 1 // com.oracle.truffle.api.object.DynamicObject target
         0: .line 93
            aload 0 /* this */
            getfield com.oracle.truffle.trufflenode.buffer.NIOBufferAccessNode.getLenNode:Lcom/oracle/truffle/js/nodes/access/ArrayBufferViewGetByteLengthNode;
            aload 1 /* target */
            invokevirtual com.oracle.truffle.js.nodes.access.ArrayBufferViewGetByteLengthNode.executeInt:(Lcom/oracle/truffle/api/object/DynamicObject;)I
            ireturn
        end local 1 // com.oracle.truffle.api.object.DynamicObject target
        end local 0 // com.oracle.truffle.trufflenode.buffer.NIOBufferAccessNode this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    1     0    this  Lcom/oracle/truffle/trufflenode/buffer/NIOBufferAccessNode;
            0    1     1  target  Lcom/oracle/truffle/api/object/DynamicObject;
    MethodParameters:
        Name  Flags
      target  

  protected void outOfBoundsFail();
    descriptor: ()V
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=3, locals=3, args_size=1
        start local 0 // com.oracle.truffle.trufflenode.buffer.NIOBufferAccessNode this
         0: .line 98
            ldc "out of range index"
            invokestatic com.oracle.truffle.js.runtime.Errors.createRangeError:(Ljava/lang/String;)Lcom/oracle/truffle/js/runtime/JSException;
            astore 1 /* exception */
        start local 1 // com.oracle.truffle.js.runtime.JSException exception
         1: .line 99
            aload 1 /* exception */
            aload 0 /* this */
            invokevirtual com.oracle.truffle.trufflenode.buffer.NIOBufferAccessNode.getContext:()Lcom/oracle/truffle/js/runtime/JSContext;
            invokevirtual com.oracle.truffle.js.runtime.JSException.getErrorObjectEager:(Lcom/oracle/truffle/js/runtime/JSContext;)Ljava/lang/Object;
            checkcast com.oracle.truffle.api.object.DynamicObject
            astore 2 /* errorObject */
        start local 2 // com.oracle.truffle.api.object.DynamicObject errorObject
         2: .line 100
            aload 2 /* errorObject */
            ldc "code"
            ldc "ERR_BUFFER_OUT_OF_BOUNDS"
            invokestatic com.oracle.truffle.js.runtime.objects.JSObject.set:(Lcom/oracle/truffle/api/object/DynamicObject;Ljava/lang/Object;Ljava/lang/Object;)Z
            pop
         3: .line 101
            aload 1 /* exception */
            athrow
        end local 2 // com.oracle.truffle.api.object.DynamicObject errorObject
        end local 1 // com.oracle.truffle.js.runtime.JSException exception
        end local 0 // com.oracle.truffle.trufflenode.buffer.NIOBufferAccessNode this
      LocalVariableTable:
        Start  End  Slot         Name  Signature
            0    4     0         this  Lcom/oracle/truffle/trufflenode/buffer/NIOBufferAccessNode;
            1    4     1    exception  Lcom/oracle/truffle/js/runtime/JSException;
            2    4     2  errorObject  Lcom/oracle/truffle/api/object/DynamicObject;
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.CompilerDirectives$TruffleBoundary()

  protected static boolean accept(com.oracle.truffle.api.object.DynamicObject);
    descriptor: (Lcom/oracle/truffle/api/object/DynamicObject;)Z
    flags: (0x000c) ACC_PROTECTED, ACC_STATIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.oracle.truffle.api.object.DynamicObject target
         0: .line 105
            aload 0 /* target */
            invokestatic com.oracle.truffle.js.runtime.builtins.JSArrayBufferView.isJSArrayBufferView:(Ljava/lang/Object;)Z
            ireturn
        end local 0 // com.oracle.truffle.api.object.DynamicObject target
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    1     0  target  Lcom/oracle/truffle/api/object/DynamicObject;
    MethodParameters:
        Name  Flags
      target  
}
SourceFile: "NIOBufferAccessNode.java"
InnerClasses:
  public abstract TruffleBoundary = com.oracle.truffle.api.CompilerDirectives$TruffleBoundary of com.oracle.truffle.api.CompilerDirectives
  public abstract Child = com.oracle.truffle.api.nodes.Node$Child of com.oracle.truffle.api.nodes.Node