https://www.graalvm.org/ 
final class com.oracle.truffle.js.runtime.interop.TopScopeObject$MergedPropertyNames implements com.oracle.truffle.api.interop.TruffleObject
  minor version: 0
  major version: 59
  flags: flags: (0x0030) ACC_FINAL, ACC_SUPER
  this_class: com.oracle.truffle.js.runtime.interop.TopScopeObject$MergedPropertyNames
  super_class: java.lang.Object
{
  private final java.lang.Object[] keys;
    descriptor: [Ljava/lang/Object;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  private final long[] size;
    descriptor: [J
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  private void <init>(java.lang.Object[]);
    descriptor: ([Ljava/lang/Object;)V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=5, locals=6, args_size=2
        start local 0 // com.oracle.truffle.js.runtime.interop.TopScopeObject$MergedPropertyNames this
        start local 1 // java.lang.Object[] keys
         0: .line 290
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 291
            aload 0 /* this */
            aload 1 /* keys */
            putfield com.oracle.truffle.js.runtime.interop.TopScopeObject$MergedPropertyNames.keys:[Ljava/lang/Object;
         2: .line 292
            aload 0 /* this */
            aload 1 /* keys */
            arraylength
            newarray 11
            putfield com.oracle.truffle.js.runtime.interop.TopScopeObject$MergedPropertyNames.size:[J
         3: .line 293
            lconst_0
            lstore 2 /* s */
        start local 2 // long s
         4: .line 294
            invokestatic com.oracle.truffle.api.interop.InteropLibrary.getUncached:()Lcom/oracle/truffle/api/interop/InteropLibrary;
            astore 4 /* interop */
        start local 4 // com.oracle.truffle.api.interop.InteropLibrary interop
         5: .line 295
            iconst_0
            istore 5 /* i */
        start local 5 // int i
         6: goto 10
         7: .line 296
      StackMap locals: com.oracle.truffle.js.runtime.interop.TopScopeObject$MergedPropertyNames java.lang.Object[] long com.oracle.truffle.api.interop.InteropLibrary int
      StackMap stack:
            lload 2 /* s */
            aload 4 /* interop */
            aload 1 /* keys */
            iload 5 /* i */
            aaload
            invokevirtual com.oracle.truffle.api.interop.InteropLibrary.getArraySize:(Ljava/lang/Object;)J
            ladd
            lstore 2 /* s */
         8: .line 297
            aload 0 /* this */
            getfield com.oracle.truffle.js.runtime.interop.TopScopeObject$MergedPropertyNames.size:[J
            iload 5 /* i */
            lload 2 /* s */
            lastore
         9: .line 295
            iinc 5 /* i */ 1
      StackMap locals:
      StackMap stack:
        10: iload 5 /* i */
            aload 1 /* keys */
            arraylength
            if_icmplt 7
        end local 5 // int i
        11: .line 299
            return
        end local 4 // com.oracle.truffle.api.interop.InteropLibrary interop
        end local 2 // long s
        end local 1 // java.lang.Object[] keys
        end local 0 // com.oracle.truffle.js.runtime.interop.TopScopeObject$MergedPropertyNames this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0   12     0     this  Lcom/oracle/truffle/js/runtime/interop/TopScopeObject$MergedPropertyNames;
            0   12     1     keys  [Ljava/lang/Object;
            4   12     2        s  J
            5   12     4  interop  Lcom/oracle/truffle/api/interop/InteropLibrary;
            6   11     5        i  I
    Exceptions:
      throws com.oracle.truffle.api.interop.UnsupportedMessageException
    MethodParameters:
      Name  Flags
      keys  

  boolean hasArrayElements();
    descriptor: ()Z
    flags: (0x0000) 
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.oracle.truffle.js.runtime.interop.TopScopeObject$MergedPropertyNames this
         0: .line 304
            iconst_1
            ireturn
        end local 0 // com.oracle.truffle.js.runtime.interop.TopScopeObject$MergedPropertyNames this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/js/runtime/interop/TopScopeObject$MergedPropertyNames;
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.library.ExportMessage()

  long getArraySize();
    descriptor: ()J
    flags: (0x0000) 
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // com.oracle.truffle.js.runtime.interop.TopScopeObject$MergedPropertyNames this
         0: .line 309
            aload 0 /* this */
            getfield com.oracle.truffle.js.runtime.interop.TopScopeObject$MergedPropertyNames.size:[J
            aload 0 /* this */
            getfield com.oracle.truffle.js.runtime.interop.TopScopeObject$MergedPropertyNames.size:[J
            arraylength
            iconst_1
            isub
            laload
            lreturn
        end local 0 // com.oracle.truffle.js.runtime.interop.TopScopeObject$MergedPropertyNames this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/js/runtime/interop/TopScopeObject$MergedPropertyNames;
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.library.ExportMessage()

  boolean isArrayElementReadable(long, com.oracle.truffle.api.interop.InteropLibrary);
    descriptor: (JLcom/oracle/truffle/api/interop/InteropLibrary;)Z
    flags: (0x0000) 
    Code:
      stack=6, locals=7, args_size=3
        start local 0 // com.oracle.truffle.js.runtime.interop.TopScopeObject$MergedPropertyNames this
        start local 1 // long index
        start local 3 // com.oracle.truffle.api.interop.InteropLibrary interop
         0: .line 315
            lload 1 /* index */
            lconst_0
            lcmp
            iflt 10
         1: .line 316
            iconst_0
            istore 4 /* i */
        start local 4 // int i
         2: goto 9
         3: .line 317
      StackMap locals: int
      StackMap stack:
            lload 1 /* index */
            aload 0 /* this */
            getfield com.oracle.truffle.js.runtime.interop.TopScopeObject$MergedPropertyNames.size:[J
            iload 4 /* i */
            laload
            lcmp
            ifge 8
         4: .line 318
            iload 4 /* i */
            ifne 5
            lconst_0
            goto 6
      StackMap locals:
      StackMap stack:
         5: aload 0 /* this */
            getfield com.oracle.truffle.js.runtime.interop.TopScopeObject$MergedPropertyNames.size:[J
            iload 4 /* i */
            iconst_1
            isub
            laload
      StackMap locals:
      StackMap stack: long
         6: lstore 5 /* start */
        start local 5 // long start
         7: .line 319
            aload 3 /* interop */
            aload 0 /* this */
            getfield com.oracle.truffle.js.runtime.interop.TopScopeObject$MergedPropertyNames.keys:[Ljava/lang/Object;
            iload 4 /* i */
            aaload
            lload 1 /* index */
            lload 5 /* start */
            lsub
            invokevirtual com.oracle.truffle.api.interop.InteropLibrary.isArrayElementReadable:(Ljava/lang/Object;J)Z
            ireturn
        end local 5 // long start
         8: .line 316
      StackMap locals:
      StackMap stack:
            iinc 4 /* i */ 1
      StackMap locals:
      StackMap stack:
         9: iload 4 /* i */
            aload 0 /* this */
            getfield com.oracle.truffle.js.runtime.interop.TopScopeObject$MergedPropertyNames.keys:[Ljava/lang/Object;
            arraylength
            if_icmplt 3
        end local 4 // int i
        10: .line 323
      StackMap locals:
      StackMap stack:
            iconst_0
            ireturn
        end local 3 // com.oracle.truffle.api.interop.InteropLibrary interop
        end local 1 // long index
        end local 0 // com.oracle.truffle.js.runtime.interop.TopScopeObject$MergedPropertyNames this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0   11     0     this  Lcom/oracle/truffle/js/runtime/interop/TopScopeObject$MergedPropertyNames;
            0   11     1    index  J
            0   11     3  interop  Lcom/oracle/truffle/api/interop/InteropLibrary;
            2   10     4        i  I
            7    8     5    start  J
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.library.ExportMessage()
    RuntimeInvisibleParameterAnnotations: 
      0:
      1:
        com.oracle.truffle.api.dsl.Cached$Shared(value = "interop")
        com.oracle.truffle.api.library.CachedLibrary(limit = "InteropLibraryLimit")
    MethodParameters:
         Name  Flags
      index    
      interop  

  java.lang.Object readArrayElement(long, com.oracle.truffle.api.interop.InteropLibrary);
    descriptor: (JLcom/oracle/truffle/api/interop/InteropLibrary;)Ljava/lang/Object;
    flags: (0x0000) 
    Code:
      stack=6, locals=7, args_size=3
        start local 0 // com.oracle.truffle.js.runtime.interop.TopScopeObject$MergedPropertyNames this
        start local 1 // long index
        start local 3 // com.oracle.truffle.api.interop.InteropLibrary interop
         0: .line 329
            lload 1 /* index */
            lconst_0
            lcmp
            iflt 10
         1: .line 330
            iconst_0
            istore 4 /* i */
        start local 4 // int i
         2: goto 9
         3: .line 331
      StackMap locals: int
      StackMap stack:
            lload 1 /* index */
            aload 0 /* this */
            getfield com.oracle.truffle.js.runtime.interop.TopScopeObject$MergedPropertyNames.size:[J
            iload 4 /* i */
            laload
            lcmp
            ifge 8
         4: .line 332
            iload 4 /* i */
            ifne 5
            lconst_0
            goto 6
      StackMap locals:
      StackMap stack:
         5: aload 0 /* this */
            getfield com.oracle.truffle.js.runtime.interop.TopScopeObject$MergedPropertyNames.size:[J
            iload 4 /* i */
            iconst_1
            isub
            laload
      StackMap locals:
      StackMap stack: long
         6: lstore 5 /* start */
        start local 5 // long start
         7: .line 333
            aload 3 /* interop */
            aload 0 /* this */
            getfield com.oracle.truffle.js.runtime.interop.TopScopeObject$MergedPropertyNames.keys:[Ljava/lang/Object;
            iload 4 /* i */
            aaload
            lload 1 /* index */
            lload 5 /* start */
            lsub
            invokevirtual com.oracle.truffle.api.interop.InteropLibrary.readArrayElement:(Ljava/lang/Object;J)Ljava/lang/Object;
            areturn
        end local 5 // long start
         8: .line 330
      StackMap locals:
      StackMap stack:
            iinc 4 /* i */ 1
      StackMap locals:
      StackMap stack:
         9: iload 4 /* i */
            aload 0 /* this */
            getfield com.oracle.truffle.js.runtime.interop.TopScopeObject$MergedPropertyNames.keys:[Ljava/lang/Object;
            arraylength
            if_icmplt 3
        end local 4 // int i
        10: .line 337
      StackMap locals:
      StackMap stack:
            lload 1 /* index */
            invokestatic com.oracle.truffle.api.interop.InvalidArrayIndexException.create:(J)Lcom/oracle/truffle/api/interop/InvalidArrayIndexException;
            athrow
        end local 3 // com.oracle.truffle.api.interop.InteropLibrary interop
        end local 1 // long index
        end local 0 // com.oracle.truffle.js.runtime.interop.TopScopeObject$MergedPropertyNames this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0   11     0     this  Lcom/oracle/truffle/js/runtime/interop/TopScopeObject$MergedPropertyNames;
            0   11     1    index  J
            0   11     3  interop  Lcom/oracle/truffle/api/interop/InteropLibrary;
            2   10     4        i  I
            7    8     5    start  J
    Exceptions:
      throws com.oracle.truffle.api.interop.InvalidArrayIndexException, com.oracle.truffle.api.interop.UnsupportedMessageException
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.library.ExportMessage()
    RuntimeInvisibleParameterAnnotations: 
      0:
      1:
        com.oracle.truffle.api.dsl.Cached$Shared(value = "interop")
        com.oracle.truffle.api.library.CachedLibrary(limit = "InteropLibraryLimit")
    MethodParameters:
         Name  Flags
      index    
      interop  
}
SourceFile: "TopScopeObject.java"
NestHost: com.oracle.truffle.js.runtime.interop.TopScopeObject
InnerClasses:
  public abstract Shared = com.oracle.truffle.api.dsl.Cached$Shared of com.oracle.truffle.api.dsl.Cached
  final MergedPropertyNames = com.oracle.truffle.js.runtime.interop.TopScopeObject$MergedPropertyNames of com.oracle.truffle.js.runtime.interop.TopScopeObject
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.library.ExportLibrary(value = Lcom/oracle/truffle/api/interop/InteropLibrary;)
    RuntimeInvisibleAnnotations: 
      com.oracle.truffle.api.dsl.ImportStatic(value = {Lcom/oracle/truffle/js/runtime/JSConfig;})