https://www.graalvm.org/ 
final class com.oracle.truffle.polyglot.HostMethodDesc$SingleMethod$MethodMHImpl extends com.oracle.truffle.polyglot.HostMethodDesc$SingleMethod$MHBase
  minor version: 0
  major version: 59
  flags: flags: (0x0030) ACC_FINAL, ACC_SUPER
  this_class: com.oracle.truffle.polyglot.HostMethodDesc$SingleMethod$MethodMHImpl
  super_class: com.oracle.truffle.polyglot.HostMethodDesc$SingleMethod$MHBase
{
  private final java.lang.reflect.Method reflectionMethod;
    descriptor: Ljava/lang/reflect/Method;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  void <init>(java.lang.reflect.Method);
    descriptor: (Ljava/lang/reflect/Method;)V
    flags: (0x0000) 
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.oracle.truffle.polyglot.HostMethodDesc$SingleMethod$MethodMHImpl this
        start local 1 // java.lang.reflect.Method reflectionMethod
         0: .line 328
            aload 0 /* this */
            aload 1 /* reflectionMethod */
            invokespecial com.oracle.truffle.polyglot.HostMethodDesc$SingleMethod$MHBase.<init>:(Ljava/lang/reflect/Executable;)V
         1: .line 329
            aload 0 /* this */
            aload 1 /* reflectionMethod */
            putfield com.oracle.truffle.polyglot.HostMethodDesc$SingleMethod$MethodMHImpl.reflectionMethod:Ljava/lang/reflect/Method;
         2: .line 330
            return
        end local 1 // java.lang.reflect.Method reflectionMethod
        end local 0 // com.oracle.truffle.polyglot.HostMethodDesc$SingleMethod$MethodMHImpl this
      LocalVariableTable:
        Start  End  Slot              Name  Signature
            0    3     0              this  Lcom/oracle/truffle/polyglot/HostMethodDesc$SingleMethod$MethodMHImpl;
            0    3     1  reflectionMethod  Ljava/lang/reflect/Method;
    MethodParameters:
                  Name  Flags
      reflectionMethod  

  public java.lang.reflect.Method getReflectionMethod();
    descriptor: ()Ljava/lang/reflect/Method;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.oracle.truffle.polyglot.HostMethodDesc$SingleMethod$MethodMHImpl this
         0: .line 334
            invokestatic com.oracle.truffle.api.CompilerAsserts.neverPartOfCompilation:()V
         1: .line 335
            aload 0 /* this */
            getfield com.oracle.truffle.polyglot.HostMethodDesc$SingleMethod$MethodMHImpl.reflectionMethod:Ljava/lang/reflect/Method;
            areturn
        end local 0 // com.oracle.truffle.polyglot.HostMethodDesc$SingleMethod$MethodMHImpl this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lcom/oracle/truffle/polyglot/HostMethodDesc$SingleMethod$MethodMHImpl;

  public java.lang.Class<?> getReturnType();
    descriptor: ()Ljava/lang/Class;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.oracle.truffle.polyglot.HostMethodDesc$SingleMethod$MethodMHImpl this
         0: .line 340
            aload 0 /* this */
            invokevirtual com.oracle.truffle.polyglot.HostMethodDesc$SingleMethod$MethodMHImpl.getReflectionMethod:()Ljava/lang/reflect/Method;
            invokevirtual java.lang.reflect.Method.getReturnType:()Ljava/lang/Class;
            areturn
        end local 0 // com.oracle.truffle.polyglot.HostMethodDesc$SingleMethod$MethodMHImpl this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/polyglot/HostMethodDesc$SingleMethod$MethodMHImpl;
    Signature: ()Ljava/lang/Class<*>;

  public boolean isInternal();
    descriptor: ()Z
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // com.oracle.truffle.polyglot.HostMethodDesc$SingleMethod$MethodMHImpl this
         0: .line 345
            aload 0 /* this */
            invokevirtual com.oracle.truffle.polyglot.HostMethodDesc$SingleMethod$MethodMHImpl.getReflectionMethod:()Ljava/lang/reflect/Method;
            invokevirtual java.lang.reflect.Method.getDeclaringClass:()Ljava/lang/Class;
            ldc Ljava/lang/Object;
            if_acmpne 1
            iconst_1
            ireturn
      StackMap locals:
      StackMap stack:
         1: iconst_0
            ireturn
        end local 0 // com.oracle.truffle.polyglot.HostMethodDesc$SingleMethod$MethodMHImpl this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lcom/oracle/truffle/polyglot/HostMethodDesc$SingleMethod$MethodMHImpl;

  protected java.lang.invoke.MethodHandle makeMethodHandle();
    descriptor: ()Ljava/lang/invoke/MethodHandle;
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=3, locals=3, args_size=1
        start local 0 // com.oracle.truffle.polyglot.HostMethodDesc$SingleMethod$MethodMHImpl this
         0: .line 350
            invokestatic com.oracle.truffle.api.CompilerAsserts.neverPartOfCompilation:()V
         1: .line 352
            aload 0 /* this */
            getfield com.oracle.truffle.polyglot.HostMethodDesc$SingleMethod$MethodMHImpl.reflectionMethod:Ljava/lang/reflect/Method;
            astore 1 /* m */
        start local 1 // java.lang.reflect.Method m
         2: .line 353
            invokestatic java.lang.invoke.MethodHandles.publicLookup:()Ljava/lang/invoke/MethodHandles$Lookup;
            aload 1 /* m */
            invokevirtual java.lang.invoke.MethodHandles$Lookup.unreflect:(Ljava/lang/reflect/Method;)Ljava/lang/invoke/MethodHandle;
            astore 2 /* methodHandle */
        start local 2 // java.lang.invoke.MethodHandle methodHandle
         3: .line 354
            aload 2 /* methodHandle */
            aload 1 /* m */
            invokevirtual java.lang.reflect.Method.getModifiers:()I
            invokestatic java.lang.reflect.Modifier.isStatic:(I)Z
            aload 1 /* m */
            invokevirtual java.lang.reflect.Method.getParameterCount:()I
            invokestatic com.oracle.truffle.polyglot.HostMethodDesc$SingleMethod$MethodMHImpl.adaptSignature:(Ljava/lang/invoke/MethodHandle;ZI)Ljava/lang/invoke/MethodHandle;
         4: areturn
        end local 2 // java.lang.invoke.MethodHandle methodHandle
        end local 1 // java.lang.reflect.Method m
         5: .line 355
      StackMap locals:
      StackMap stack: java.lang.IllegalAccessException
            astore 1 /* e */
        start local 1 // java.lang.IllegalAccessException e
         6: .line 356
            new java.lang.IllegalStateException
            dup
            aload 1 /* e */
            invokespecial java.lang.IllegalStateException.<init>:(Ljava/lang/Throwable;)V
            athrow
        end local 1 // java.lang.IllegalAccessException e
        end local 0 // com.oracle.truffle.polyglot.HostMethodDesc$SingleMethod$MethodMHImpl this
      LocalVariableTable:
        Start  End  Slot          Name  Signature
            0    7     0          this  Lcom/oracle/truffle/polyglot/HostMethodDesc$SingleMethod$MethodMHImpl;
            2    5     1             m  Ljava/lang/reflect/Method;
            3    5     2  methodHandle  Ljava/lang/invoke/MethodHandle;
            6    7     1             e  Ljava/lang/IllegalAccessException;
      Exception table:
        from    to  target  type
           1     4       5  Class java.lang.IllegalAccessException

  public java.lang.reflect.Executable getReflectionMethod();
    descriptor: ()Ljava/lang/reflect/Executable;
    flags: (0x1041) ACC_PUBLIC, ACC_BRIDGE, ACC_SYNTHETIC
    Code:
      stack=1, locals=1, args_size=1
         0: .line 1
            aload 0
            invokevirtual com.oracle.truffle.polyglot.HostMethodDesc$SingleMethod$MethodMHImpl.getReflectionMethod:()Ljava/lang/reflect/Method;
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature
}
SourceFile: "HostMethodDesc.java"
NestHost: com.oracle.truffle.polyglot.HostMethodDesc
InnerClasses:
  abstract SingleMethod = com.oracle.truffle.polyglot.HostMethodDesc$SingleMethod of com.oracle.truffle.polyglot.HostMethodDesc
  abstract MHBase = com.oracle.truffle.polyglot.HostMethodDesc$SingleMethod$MHBase of com.oracle.truffle.polyglot.HostMethodDesc$SingleMethod
  private final MethodMHImpl = com.oracle.truffle.polyglot.HostMethodDesc$SingleMethod$MethodMHImpl of com.oracle.truffle.polyglot.HostMethodDesc$SingleMethod
  public final Lookup = java.lang.invoke.MethodHandles$Lookup of java.lang.invoke.MethodHandles