https://www.graalvm.org/ 
class com.oracle.truffle.nfi.NFISignature$CreateClosure
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: com.oracle.truffle.nfi.NFISignature$CreateClosure
  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.NFISignature$CreateClosure this
         0: .line 112
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // com.oracle.truffle.nfi.NFISignature$CreateClosure this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/nfi/NFISignature$CreateClosure;

  static com.oracle.truffle.nfi.NFIClosure createClosure(java.lang.Object, com.oracle.truffle.nfi.NFISignature);
    descriptor: (Ljava/lang/Object;Lcom/oracle/truffle/nfi/NFISignature;)Lcom/oracle/truffle/nfi/NFIClosure;
    flags: (0x0008) ACC_STATIC
    Code:
      stack=4, locals=2, args_size=2
        start local 0 // java.lang.Object executable
        start local 1 // com.oracle.truffle.nfi.NFISignature signature
         0: .line 115
            new com.oracle.truffle.nfi.NFIClosure
            dup
            aload 0 /* executable */
            aload 1 /* signature */
            invokespecial com.oracle.truffle.nfi.NFIClosure.<init>:(Ljava/lang/Object;Lcom/oracle/truffle/nfi/NFISignature;)V
            areturn
        end local 1 // com.oracle.truffle.nfi.NFISignature signature
        end local 0 // java.lang.Object executable
      LocalVariableTable:
        Start  End  Slot        Name  Signature
            0    1     0  executable  Ljava/lang/Object;
            0    1     1   signature  Lcom/oracle/truffle/nfi/NFISignature;
    MethodParameters:
            Name  Flags
      executable  
      signature   

  static java.lang.Object doCached(com.oracle.truffle.nfi.NFISignature, java.lang.Object, com.oracle.truffle.nfi.NFIClosure, com.oracle.truffle.nfi.spi.NFIBackendSignatureLibrary, java.lang.Object);
    descriptor: (Lcom/oracle/truffle/nfi/NFISignature;Ljava/lang/Object;Lcom/oracle/truffle/nfi/NFIClosure;Lcom/oracle/truffle/nfi/spi/NFIBackendSignatureLibrary;Ljava/lang/Object;)Ljava/lang/Object;
    flags: (0x0008) ACC_STATIC
    Code:
      stack=1, locals=5, args_size=5
        start local 0 // com.oracle.truffle.nfi.NFISignature signature
        start local 1 // java.lang.Object executable
        start local 2 // com.oracle.truffle.nfi.NFIClosure cachedClosure
        start local 3 // com.oracle.truffle.nfi.spi.NFIBackendSignatureLibrary lib
        start local 4 // java.lang.Object cachedRet
         0: .line 124
            aload 4 /* cachedRet */
            areturn
        end local 4 // java.lang.Object cachedRet
        end local 3 // com.oracle.truffle.nfi.spi.NFIBackendSignatureLibrary lib
        end local 2 // com.oracle.truffle.nfi.NFIClosure cachedClosure
        end local 1 // java.lang.Object executable
        end local 0 // com.oracle.truffle.nfi.NFISignature signature
      LocalVariableTable:
        Start  End  Slot           Name  Signature
            0    1     0      signature  Lcom/oracle/truffle/nfi/NFISignature;
            0    1     1     executable  Ljava/lang/Object;
            0    1     2  cachedClosure  Lcom/oracle/truffle/nfi/NFIClosure;
            0    1     3            lib  Lcom/oracle/truffle/nfi/spi/NFIBackendSignatureLibrary;
            0    1     4      cachedRet  Ljava/lang/Object;
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.dsl.Specialization(guards = {"executable == cachedClosure.executable", "signature == cachedClosure.signature"}, assumptions = {"getSingleContextAssumption()"})
    RuntimeInvisibleParameterAnnotations: 
      0:
      1:
      2:
        com.oracle.truffle.api.dsl.Cached(value = "createClosure(executable, signature)")
      3:
        com.oracle.truffle.api.library.CachedLibrary(value = "cachedClosure.signature.nativeSignature")
      4:
        com.oracle.truffle.api.dsl.Cached(value = "lib.createClosure(cachedClosure.signature.nativeSignature, cachedClosure)")
    MethodParameters:
               Name  Flags
      signature      
      executable     
      cachedClosure  
      lib            
      cachedRet      

  static java.lang.Object doCreate(com.oracle.truffle.nfi.NFISignature, java.lang.Object, com.oracle.truffle.nfi.spi.NFIBackendSignatureLibrary);
    descriptor: (Lcom/oracle/truffle/nfi/NFISignature;Ljava/lang/Object;Lcom/oracle/truffle/nfi/spi/NFIBackendSignatureLibrary;)Ljava/lang/Object;
    flags: (0x0008) ACC_STATIC
    Code:
      stack=4, locals=4, args_size=3
        start local 0 // com.oracle.truffle.nfi.NFISignature signature
        start local 1 // java.lang.Object executable
        start local 2 // com.oracle.truffle.nfi.spi.NFIBackendSignatureLibrary lib
         0: .line 130
            new com.oracle.truffle.nfi.NFIClosure
            dup
            aload 1 /* executable */
            aload 0 /* signature */
            invokespecial com.oracle.truffle.nfi.NFIClosure.<init>:(Ljava/lang/Object;Lcom/oracle/truffle/nfi/NFISignature;)V
            astore 3 /* closure */
        start local 3 // com.oracle.truffle.nfi.NFIClosure closure
         1: .line 131
            aload 2 /* lib */
            aload 0 /* signature */
            getfield com.oracle.truffle.nfi.NFISignature.nativeSignature:Ljava/lang/Object;
            aload 3 /* closure */
            invokevirtual com.oracle.truffle.nfi.spi.NFIBackendSignatureLibrary.createClosure:(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
            areturn
        end local 3 // com.oracle.truffle.nfi.NFIClosure closure
        end local 2 // com.oracle.truffle.nfi.spi.NFIBackendSignatureLibrary lib
        end local 1 // java.lang.Object executable
        end local 0 // com.oracle.truffle.nfi.NFISignature signature
      LocalVariableTable:
        Start  End  Slot        Name  Signature
            0    2     0   signature  Lcom/oracle/truffle/nfi/NFISignature;
            0    2     1  executable  Ljava/lang/Object;
            0    2     2         lib  Lcom/oracle/truffle/nfi/spi/NFIBackendSignatureLibrary;
            1    2     3     closure  Lcom/oracle/truffle/nfi/NFIClosure;
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.dsl.Specialization(replaces = {"doCached"})
    RuntimeInvisibleParameterAnnotations: 
      0:
      1:
      2:
        com.oracle.truffle.api.library.CachedLibrary(value = "signature.nativeSignature")
    MethodParameters:
            Name  Flags
      signature   
      executable  
      lib         
}
SourceFile: "NFISignature.java"
NestHost: com.oracle.truffle.nfi.NFISignature
InnerClasses:
  CreateClosure = com.oracle.truffle.nfi.NFISignature$CreateClosure of com.oracle.truffle.nfi.NFISignature
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.library.ExportMessage()
    RuntimeInvisibleAnnotations: 
      com.oracle.truffle.api.dsl.ImportStatic(value = {Lcom/oracle/truffle/nfi/NFILanguage;})