https://www.graalvm.org/ 
class org.graalvm.compiler.truffle.runtime.hotspot.libgraal.LibGraalScopedHandle implements java.lang.AutoCloseable
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: org.graalvm.compiler.truffle.runtime.hotspot.libgraal.LibGraalScopedHandle
  super_class: java.lang.Object
{
  private long handle;
    descriptor: J
    flags: (0x0002) ACC_PRIVATE

  private final java.lang.Class<?> handleType;
    descriptor: Ljava/lang/Class;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL
    Signature: Ljava/lang/Class<*>;

  void <init>(long, java.lang.Class<?>);
    descriptor: (JLjava/lang/Class;)V
    flags: (0x0000) 
    Code:
      stack=3, locals=4, args_size=3
        start local 0 // org.graalvm.compiler.truffle.runtime.hotspot.libgraal.LibGraalScopedHandle this
        start local 1 // long handle
        start local 3 // java.lang.Class handleType
         0: .line 45
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 46
            aload 0 /* this */
            lload 1 /* handle */
            putfield org.graalvm.compiler.truffle.runtime.hotspot.libgraal.LibGraalScopedHandle.handle:J
         2: .line 47
            aload 0 /* this */
            aload 3 /* handleType */
            putfield org.graalvm.compiler.truffle.runtime.hotspot.libgraal.LibGraalScopedHandle.handleType:Ljava/lang/Class;
         3: .line 48
            return
        end local 3 // java.lang.Class handleType
        end local 1 // long handle
        end local 0 // org.graalvm.compiler.truffle.runtime.hotspot.libgraal.LibGraalScopedHandle this
      LocalVariableTable:
        Start  End  Slot        Name  Signature
            0    4     0        this  Lorg/graalvm/compiler/truffle/runtime/hotspot/libgraal/LibGraalScopedHandle;
            0    4     1      handle  J
            0    4     3  handleType  Ljava/lang/Class<*>;
    Signature: (JLjava/lang/Class<*>;)V
    MethodParameters:
            Name  Flags
      handle      
      handleType  

  long getHandle();
    descriptor: ()J
    flags: (0x0000) 
    Code:
      stack=5, locals=1, args_size=1
        start local 0 // org.graalvm.compiler.truffle.runtime.hotspot.libgraal.LibGraalScopedHandle this
         0: .line 51
            aload 0 /* this */
            getfield org.graalvm.compiler.truffle.runtime.hotspot.libgraal.LibGraalScopedHandle.handle:J
            lconst_0
            lcmp
            ifne 2
         1: .line 52
            new java.lang.IllegalStateException
            dup
            new java.lang.StringBuilder
            dup
            ldc "Using invalid handle to "
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            aload 0 /* this */
            getfield org.graalvm.compiler.truffle.runtime.hotspot.libgraal.LibGraalScopedHandle.handleType:Ljava/lang/Class;
            invokevirtual java.lang.Class.getName:()Ljava/lang/String;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            ldc " object in libgraal heap"
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            invokespecial java.lang.IllegalStateException.<init>:(Ljava/lang/String;)V
            athrow
         2: .line 54
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield org.graalvm.compiler.truffle.runtime.hotspot.libgraal.LibGraalScopedHandle.handle:J
            lreturn
        end local 0 // org.graalvm.compiler.truffle.runtime.hotspot.libgraal.LibGraalScopedHandle this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lorg/graalvm/compiler/truffle/runtime/hotspot/libgraal/LibGraalScopedHandle;

  public void close();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // org.graalvm.compiler.truffle.runtime.hotspot.libgraal.LibGraalScopedHandle this
         0: .line 59
            aload 0 /* this */
            lconst_0
            putfield org.graalvm.compiler.truffle.runtime.hotspot.libgraal.LibGraalScopedHandle.handle:J
         1: .line 60
            return
        end local 0 // org.graalvm.compiler.truffle.runtime.hotspot.libgraal.LibGraalScopedHandle this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lorg/graalvm/compiler/truffle/runtime/hotspot/libgraal/LibGraalScopedHandle;

  public java.lang.String toString();
    descriptor: ()Ljava/lang/String;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=6, locals=1, args_size=1
        start local 0 // org.graalvm.compiler.truffle.runtime.hotspot.libgraal.LibGraalScopedHandle this
         0: .line 64
            ldc "%s@0x%x"
            iconst_2
            anewarray java.lang.Object
            dup
            iconst_0
            aload 0 /* this */
            getfield org.graalvm.compiler.truffle.runtime.hotspot.libgraal.LibGraalScopedHandle.handleType:Ljava/lang/Class;
            invokevirtual java.lang.Class.getName:()Ljava/lang/String;
            aastore
            dup
            iconst_1
            aload 0 /* this */
            getfield org.graalvm.compiler.truffle.runtime.hotspot.libgraal.LibGraalScopedHandle.handle:J
            invokestatic java.lang.Long.valueOf:(J)Ljava/lang/Long;
            aastore
            invokestatic java.lang.String.format:(Ljava/lang/String;[Ljava/lang/Object;)Ljava/lang/String;
            areturn
        end local 0 // org.graalvm.compiler.truffle.runtime.hotspot.libgraal.LibGraalScopedHandle this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/graalvm/compiler/truffle/runtime/hotspot/libgraal/LibGraalScopedHandle;
}
SourceFile: "LibGraalScopedHandle.java"