https://www.graalvm.org/ 
final class com.oracle.svm.graal.hotspot.libgraal.Target_org_graalvm_compiler_core_GraalServiceThread
  minor version: 0
  major version: 59
  flags: flags: (0x0030) ACC_FINAL, ACC_SUPER
  this_class: com.oracle.svm.graal.hotspot.libgraal.Target_org_graalvm_compiler_core_GraalServiceThread
  super_class: java.lang.Object
{
  void <init>();
    descriptor: ()V
    flags: (0x0000) 
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.oracle.svm.graal.hotspot.libgraal.Target_org_graalvm_compiler_core_GraalServiceThread this
         0: .line 771
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // com.oracle.svm.graal.hotspot.libgraal.Target_org_graalvm_compiler_core_GraalServiceThread this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/svm/graal/hotspot/libgraal/Target_org_graalvm_compiler_core_GraalServiceThread;

  void beforeRun();
    descriptor: ()V
    flags: (0x0000) 
    Code:
      stack=3, locals=2, args_size=1
        start local 0 // com.oracle.svm.graal.hotspot.libgraal.Target_org_graalvm_compiler_core_GraalServiceThread this
         0: .line 774
            aload 0 /* this */
            ldc Lorg/graalvm/compiler/core/GraalServiceThread;
            invokestatic com.oracle.svm.core.snippets.KnownIntrinsics.convertUnknownValue:(Ljava/lang/Object;Ljava/lang/Class;)Ljava/lang/Object;
            checkcast org.graalvm.compiler.core.GraalServiceThread
            astore 1 /* thread */
        start local 1 // org.graalvm.compiler.core.GraalServiceThread thread
         1: .line 775
            aload 1 /* thread */
            invokevirtual org.graalvm.compiler.core.GraalServiceThread.isDaemon:()Z
            aconst_null
            invokestatic org.graalvm.libgraal.LibGraal.attachCurrentThread:(Z[J)Z
            ifne 3
         2: .line 776
            new java.lang.InternalError
            dup
            ldc "Couldn't attach to HotSpot runtime"
            invokespecial java.lang.InternalError.<init>:(Ljava/lang/String;)V
            athrow
         3: .line 778
      StackMap locals: org.graalvm.compiler.core.GraalServiceThread
      StackMap stack:
            return
        end local 1 // org.graalvm.compiler.core.GraalServiceThread thread
        end local 0 // com.oracle.svm.graal.hotspot.libgraal.Target_org_graalvm_compiler_core_GraalServiceThread this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    4     0    this  Lcom/oracle/svm/graal/hotspot/libgraal/Target_org_graalvm_compiler_core_GraalServiceThread;
            1    4     1  thread  Lorg/graalvm/compiler/core/GraalServiceThread;
    RuntimeVisibleAnnotations: 
      com.oracle.svm.core.annotate.Substitute()

  void afterRun();
    descriptor: ()V
    flags: (0x0000) 
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.oracle.svm.graal.hotspot.libgraal.Target_org_graalvm_compiler_core_GraalServiceThread this
         0: .line 783
            iconst_0
            invokestatic org.graalvm.libgraal.LibGraal.detachCurrentThread:(Z)Z
            pop
         1: .line 784
            return
        end local 0 // com.oracle.svm.graal.hotspot.libgraal.Target_org_graalvm_compiler_core_GraalServiceThread this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lcom/oracle/svm/graal/hotspot/libgraal/Target_org_graalvm_compiler_core_GraalServiceThread;
    RuntimeVisibleAnnotations: 
      com.oracle.svm.core.annotate.Substitute()
}
SourceFile: "LibGraalFeature.java"
    RuntimeVisibleAnnotations: 
      com.oracle.svm.core.annotate.TargetClass(className = "org.graalvm.compiler.core.GraalServiceThread", onlyWith = {Lcom/oracle/svm/graal/hotspot/libgraal/LibGraalFeature$IsEnabled;})