https://www.graalvm.org/ 
class com.oracle.truffle.nfi.NFISymbol$Execute
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: com.oracle.truffle.nfi.NFISymbol$Execute
  super_class: java.lang.Object
{
  void <init>();
    descriptor: ()V
    flags: (0x0000) 
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.oracle.truffle.nfi.NFISymbol$Execute this
         0: .line 92
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // com.oracle.truffle.nfi.NFISymbol$Execute this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/nfi/NFISymbol$Execute;

  static java.lang.Object doGeneric(com.oracle.truffle.nfi.NFISymbol, java.lang.Object[], com.oracle.truffle.nfi.api.SignatureLibrary);
    descriptor: (Lcom/oracle/truffle/nfi/NFISymbol;[Ljava/lang/Object;Lcom/oracle/truffle/nfi/api/SignatureLibrary;)Ljava/lang/Object;
    flags: (0x0008) ACC_STATIC
    Code:
      stack=4, locals=3, args_size=3
        start local 0 // com.oracle.truffle.nfi.NFISymbol symbol
        start local 1 // java.lang.Object[] args
        start local 2 // com.oracle.truffle.nfi.api.SignatureLibrary library
         0: .line 97
            aload 2 /* library */
            aload 0 /* symbol */
            getfield com.oracle.truffle.nfi.NFISymbol.signature:Ljava/lang/Object;
            aload 0 /* symbol */
            getfield com.oracle.truffle.nfi.NFISymbol.nativeSymbol:Ljava/lang/Object;
            aload 1 /* args */
            invokevirtual com.oracle.truffle.nfi.api.SignatureLibrary.call:(Ljava/lang/Object;Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;
            areturn
        end local 2 // com.oracle.truffle.nfi.api.SignatureLibrary library
        end local 1 // java.lang.Object[] args
        end local 0 // com.oracle.truffle.nfi.NFISymbol symbol
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    1     0   symbol  Lcom/oracle/truffle/nfi/NFISymbol;
            0    1     1     args  [Ljava/lang/Object;
            0    1     2  library  Lcom/oracle/truffle/nfi/api/SignatureLibrary;
    Exceptions:
      throws com.oracle.truffle.api.interop.ArityException, com.oracle.truffle.api.interop.UnsupportedTypeException, com.oracle.truffle.api.interop.UnsupportedMessageException
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.dsl.Specialization(guards = {"symbol.isExecutable()"})
    RuntimeInvisibleParameterAnnotations: 
      0:
      1:
      2:
        com.oracle.truffle.api.library.CachedLibrary(value = "symbol.signature")
    MethodParameters:
         Name  Flags
      symbol   
      args     
      library  

  static java.lang.Object doFail(com.oracle.truffle.nfi.NFISymbol, java.lang.Object[]);
    descriptor: (Lcom/oracle/truffle/nfi/NFISymbol;[Ljava/lang/Object;)Ljava/lang/Object;
    flags: (0x0008) ACC_STATIC
    Code:
      stack=1, locals=2, args_size=2
        start local 0 // com.oracle.truffle.nfi.NFISymbol symbol
        start local 1 // java.lang.Object[] args
         0: .line 103
            invokestatic com.oracle.truffle.api.interop.UnsupportedMessageException.create:()Lcom/oracle/truffle/api/interop/UnsupportedMessageException;
            athrow
        end local 1 // java.lang.Object[] args
        end local 0 // com.oracle.truffle.nfi.NFISymbol symbol
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    1     0  symbol  Lcom/oracle/truffle/nfi/NFISymbol;
            0    1     1    args  [Ljava/lang/Object;
    Exceptions:
      throws com.oracle.truffle.api.interop.UnsupportedMessageException
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.dsl.Specialization(guards = {"!symbol.isExecutable()"})
    MethodParameters:
        Name  Flags
      symbol  
      args    
}
SourceFile: "NFISymbol.java"
NestHost: com.oracle.truffle.nfi.NFISymbol
InnerClasses:
  Execute = com.oracle.truffle.nfi.NFISymbol$Execute of com.oracle.truffle.nfi.NFISymbol
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.library.ExportMessage()