https://www.graalvm.org/ 
public final class com.oracle.truffle.llvm.nativemode.runtime.NFIContextExtension$Factory implements com.oracle.truffle.llvm.runtime.ContextExtension$Factory<com.oracle.truffle.llvm.runtime.NativeContextExtension>
  minor version: 0
  major version: 59
  flags: flags: (0x0031) ACC_PUBLIC, ACC_FINAL, ACC_SUPER
  this_class: com.oracle.truffle.llvm.nativemode.runtime.NFIContextExtension$Factory
  super_class: java.lang.Object
{
  private final com.oracle.truffle.llvm.nativemode.runtime.NFIContextExtension$SignatureSourceCache signatureSourceCache;
    descriptor: Lcom/oracle/truffle/llvm/nativemode/runtime/NFIContextExtension$SignatureSourceCache;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // com.oracle.truffle.llvm.nativemode.runtime.NFIContextExtension$Factory this
         0: .line 179
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 182
            aload 0 /* this */
            new com.oracle.truffle.llvm.nativemode.runtime.NFIContextExtension$SignatureSourceCache
            dup
            invokespecial com.oracle.truffle.llvm.nativemode.runtime.NFIContextExtension$SignatureSourceCache.<init>:()V
            putfield com.oracle.truffle.llvm.nativemode.runtime.NFIContextExtension$Factory.signatureSourceCache:Lcom/oracle/truffle/llvm/nativemode/runtime/NFIContextExtension$SignatureSourceCache;
         2: .line 179
            return
        end local 0 // com.oracle.truffle.llvm.nativemode.runtime.NFIContextExtension$Factory this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lcom/oracle/truffle/llvm/nativemode/runtime/NFIContextExtension$Factory;

  public com.oracle.truffle.llvm.runtime.NativeContextExtension create(com.oracle.truffle.api.TruffleLanguage$Env);
    descriptor: (Lcom/oracle/truffle/api/TruffleLanguage$Env;)Lcom/oracle/truffle/llvm/runtime/NativeContextExtension;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=4, locals=2, args_size=2
        start local 0 // com.oracle.truffle.llvm.nativemode.runtime.NFIContextExtension$Factory this
        start local 1 // com.oracle.truffle.api.TruffleLanguage$Env env
         0: .line 186
            new com.oracle.truffle.llvm.nativemode.runtime.NFIContextExtension
            dup
            aload 1 /* env */
            aload 0 /* this */
            getfield com.oracle.truffle.llvm.nativemode.runtime.NFIContextExtension$Factory.signatureSourceCache:Lcom/oracle/truffle/llvm/nativemode/runtime/NFIContextExtension$SignatureSourceCache;
            invokespecial com.oracle.truffle.llvm.nativemode.runtime.NFIContextExtension.<init>:(Lcom/oracle/truffle/api/TruffleLanguage$Env;Lcom/oracle/truffle/llvm/nativemode/runtime/NFIContextExtension$SignatureSourceCache;)V
            areturn
        end local 1 // com.oracle.truffle.api.TruffleLanguage$Env env
        end local 0 // com.oracle.truffle.llvm.nativemode.runtime.NFIContextExtension$Factory this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/llvm/nativemode/runtime/NFIContextExtension$Factory;
            0    1     1   env  Lcom/oracle/truffle/api/TruffleLanguage$Env;
    MethodParameters:
      Name  Flags
      env   

  public com.oracle.truffle.llvm.runtime.ContextExtension create(com.oracle.truffle.api.TruffleLanguage$Env);
    descriptor: (Lcom/oracle/truffle/api/TruffleLanguage$Env;)Lcom/oracle/truffle/llvm/runtime/ContextExtension;
    flags: (0x1041) ACC_PUBLIC, ACC_BRIDGE, ACC_SYNTHETIC
    Code:
      stack=2, locals=2, args_size=2
         0: .line 1
            aload 0
            aload 1
            invokevirtual com.oracle.truffle.llvm.nativemode.runtime.NFIContextExtension$Factory.create:(Lcom/oracle/truffle/api/TruffleLanguage$Env;)Lcom/oracle/truffle/llvm/runtime/NativeContextExtension;
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature
}
Signature: Ljava/lang/Object;Lcom/oracle/truffle/llvm/runtime/ContextExtension$Factory<Lcom/oracle/truffle/llvm/runtime/NativeContextExtension;>;
SourceFile: "NFIContextExtension.java"
NestHost: com.oracle.truffle.llvm.nativemode.runtime.NFIContextExtension
InnerClasses:
  public final Env = com.oracle.truffle.api.TruffleLanguage$Env of com.oracle.truffle.api.TruffleLanguage
  public final Factory = com.oracle.truffle.llvm.nativemode.runtime.NFIContextExtension$Factory of com.oracle.truffle.llvm.nativemode.runtime.NFIContextExtension
  private final SignatureSourceCache = com.oracle.truffle.llvm.nativemode.runtime.NFIContextExtension$SignatureSourceCache of com.oracle.truffle.llvm.nativemode.runtime.NFIContextExtension
  public abstract Factory = com.oracle.truffle.llvm.runtime.ContextExtension$Factory of com.oracle.truffle.llvm.runtime.ContextExtension