https://www.graalvm.org/ 
final class com.oracle.truffle.api.debug.test.Context
  minor version: 0
  major version: 59
  flags: flags: (0x0030) ACC_FINAL, ACC_SUPER
  this_class: com.oracle.truffle.api.debug.test.Context
  super_class: java.lang.Object
{
  final java.lang.Object nul;
    descriptor: Ljava/lang/Object;
    flags: (0x0010) ACC_FINAL

  final int preMaterialization;
    descriptor: I
    flags: (0x0010) ACC_FINAL

  void <init>(com.oracle.truffle.api.TruffleLanguage$Env);
    descriptor: (Lcom/oracle/truffle/api/TruffleLanguage$Env;)V
    flags: (0x0000) 
    Code:
      stack=3, locals=2, args_size=2
        start local 0 // com.oracle.truffle.api.debug.test.Context this
        start local 1 // com.oracle.truffle.api.TruffleLanguage$Env env
         0: .line 509
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 510
            aload 0 /* this */
            aload 1 /* env */
            aconst_null
            invokevirtual com.oracle.truffle.api.TruffleLanguage$Env.asGuestValue:(Ljava/lang/Object;)Ljava/lang/Object;
            putfield com.oracle.truffle.api.debug.test.Context.nul:Ljava/lang/Object;
         2: .line 511
            aload 0 /* this */
            aload 1 /* env */
            invokevirtual com.oracle.truffle.api.TruffleLanguage$Env.getOptions:()Lorg/graalvm/options/OptionValues;
            getstatic com.oracle.truffle.api.debug.test.InstrumentablePositionsTestLanguage.PreMaterialize:Lorg/graalvm/options/OptionKey;
            invokeinterface org.graalvm.options.OptionValues.get:(Lorg/graalvm/options/OptionKey;)Ljava/lang/Object;
            checkcast java.lang.Integer
            invokevirtual java.lang.Integer.intValue:()I
            putfield com.oracle.truffle.api.debug.test.Context.preMaterialization:I
         3: .line 512
            return
        end local 1 // com.oracle.truffle.api.TruffleLanguage$Env env
        end local 0 // com.oracle.truffle.api.debug.test.Context this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    4     0  this  Lcom/oracle/truffle/api/debug/test/Context;
            0    4     1   env  Lcom/oracle/truffle/api/TruffleLanguage$Env;
    MethodParameters:
      Name  Flags
      env   

  int getPreMaterialization();
    descriptor: ()I
    flags: (0x0000) 
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.oracle.truffle.api.debug.test.Context this
         0: .line 515
            aload 0 /* this */
            getfield com.oracle.truffle.api.debug.test.Context.preMaterialization:I
            ireturn
        end local 0 // com.oracle.truffle.api.debug.test.Context this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/api/debug/test/Context;
}
SourceFile: "InstrumentablePositionsTestLanguage.java"
InnerClasses:
  public final Env = com.oracle.truffle.api.TruffleLanguage$Env of com.oracle.truffle.api.TruffleLanguage