https://www.graalvm.org/ 
class com.oracle.truffle.polyglot.PolyglotSourceCache$WeakCacheValue
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: com.oracle.truffle.polyglot.PolyglotSourceCache$WeakCacheValue
  super_class: java.lang.Object
{
  final com.oracle.truffle.api.CallTarget target;
    descriptor: Lcom/oracle/truffle/api/CallTarget;
    flags: (0x0010) ACC_FINAL

  final com.oracle.truffle.api.source.Source source;
    descriptor: Lcom/oracle/truffle/api/source/Source;
    flags: (0x0010) ACC_FINAL

  void <init>(com.oracle.truffle.api.CallTarget, com.oracle.truffle.api.source.Source);
    descriptor: (Lcom/oracle/truffle/api/CallTarget;Lcom/oracle/truffle/api/source/Source;)V
    flags: (0x0000) 
    Code:
      stack=2, locals=3, args_size=3
        start local 0 // com.oracle.truffle.polyglot.PolyglotSourceCache$WeakCacheValue this
        start local 1 // com.oracle.truffle.api.CallTarget target
        start local 2 // com.oracle.truffle.api.source.Source source
         0: .line 266
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 267
            aload 0 /* this */
            aload 1 /* target */
            putfield com.oracle.truffle.polyglot.PolyglotSourceCache$WeakCacheValue.target:Lcom/oracle/truffle/api/CallTarget;
         2: .line 268
            aload 0 /* this */
            aload 2 /* source */
            putfield com.oracle.truffle.polyglot.PolyglotSourceCache$WeakCacheValue.source:Lcom/oracle/truffle/api/source/Source;
         3: .line 269
            return
        end local 2 // com.oracle.truffle.api.source.Source source
        end local 1 // com.oracle.truffle.api.CallTarget target
        end local 0 // com.oracle.truffle.polyglot.PolyglotSourceCache$WeakCacheValue this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    4     0    this  Lcom/oracle/truffle/polyglot/PolyglotSourceCache$WeakCacheValue;
            0    4     1  target  Lcom/oracle/truffle/api/CallTarget;
            0    4     2  source  Lcom/oracle/truffle/api/source/Source;
    MethodParameters:
        Name  Flags
      target  
      source  
}
SourceFile: "PolyglotSourceCache.java"
NestHost: com.oracle.truffle.polyglot.PolyglotSourceCache
InnerClasses:
  WeakCacheValue = com.oracle.truffle.polyglot.PolyglotSourceCache$WeakCacheValue of com.oracle.truffle.polyglot.PolyglotSourceCache