https://www.graalvm.org/ 
class com.oracle.truffle.tools.profiler.ShadowStack$1 implements com.oracle.truffle.api.instrumentation.ExecutionEventNodeFactory
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: com.oracle.truffle.tools.profiler.ShadowStack$1
  super_class: java.lang.Object
{
  final com.oracle.truffle.tools.profiler.ShadowStack this$0;
    descriptor: Lcom/oracle/truffle/tools/profiler/ShadowStack;
    flags: (0x1010) ACC_FINAL, ACC_SYNTHETIC

  private final com.oracle.truffle.api.instrumentation.Instrumenter val$instrumenter;
    descriptor: Lcom/oracle/truffle/api/instrumentation/Instrumenter;
    flags: (0x1012) ACC_PRIVATE, ACC_FINAL, ACC_SYNTHETIC

  private final boolean val$compiledOnly;
    descriptor: Z
    flags: (0x1012) ACC_PRIVATE, ACC_FINAL, ACC_SYNTHETIC

  void <init>(com.oracle.truffle.tools.profiler.ShadowStack, com.oracle.truffle.api.instrumentation.Instrumenter, boolean);
    descriptor: (Lcom/oracle/truffle/tools/profiler/ShadowStack;Lcom/oracle/truffle/api/instrumentation/Instrumenter;Z)V
    flags: (0x0000) 
    Code:
      stack=2, locals=4, args_size=4
        start local 0 // com.oracle.truffle.tools.profiler.ShadowStack$1 this
         0: .line 80
            aload 0 /* this */
            aload 1
            putfield com.oracle.truffle.tools.profiler.ShadowStack$1.this$0:Lcom/oracle/truffle/tools/profiler/ShadowStack;
            aload 0 /* this */
            aload 2
            putfield com.oracle.truffle.tools.profiler.ShadowStack$1.val$instrumenter:Lcom/oracle/truffle/api/instrumentation/Instrumenter;
            aload 0 /* this */
            iload 3
            putfield com.oracle.truffle.tools.profiler.ShadowStack$1.val$compiledOnly:Z
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // com.oracle.truffle.tools.profiler.ShadowStack$1 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/tools/profiler/ShadowStack$1;
    MethodParameters:
                  Name  Flags
      this$0            final
      val$instrumenter  final
      val$compiledOnly  final

  public com.oracle.truffle.api.instrumentation.ExecutionEventNode create(com.oracle.truffle.api.instrumentation.EventContext);
    descriptor: (Lcom/oracle/truffle/api/instrumentation/EventContext;)Lcom/oracle/truffle/api/instrumentation/ExecutionEventNode;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=6, locals=3, args_size=2
        start local 0 // com.oracle.truffle.tools.profiler.ShadowStack$1 this
        start local 1 // com.oracle.truffle.api.instrumentation.EventContext context
         0: .line 82
            aload 1 /* context */
            invokevirtual com.oracle.truffle.api.instrumentation.EventContext.getInstrumentedNode:()Lcom/oracle/truffle/api/nodes/Node;
            astore 2 /* instrumentedNode */
        start local 2 // com.oracle.truffle.api.nodes.Node instrumentedNode
         1: .line 83
            aload 2 /* instrumentedNode */
            invokevirtual com.oracle.truffle.api.nodes.Node.getSourceSection:()Lcom/oracle/truffle/api/source/SourceSection;
            ifnonnull 4
         2: .line 84
            aload 0 /* this */
            getfield com.oracle.truffle.tools.profiler.ShadowStack$1.this$0:Lcom/oracle/truffle/tools/profiler/ShadowStack;
            getfield com.oracle.truffle.tools.profiler.ShadowStack.logger:Lcom/oracle/truffle/api/TruffleLogger;
            new java.lang.StringBuilder
            dup
            ldc "Instrumented node "
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            aload 2 /* instrumentedNode */
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/Object;)Ljava/lang/StringBuilder;
            ldc " has null SourceSection."
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            invokevirtual com.oracle.truffle.api.TruffleLogger.warning:(Ljava/lang/String;)V
         3: .line 85
            aconst_null
            areturn
         4: .line 87
      StackMap locals: com.oracle.truffle.api.nodes.Node
      StackMap stack:
            new com.oracle.truffle.tools.profiler.ShadowStack$StackPushPopNode
            dup
            aload 0 /* this */
            getfield com.oracle.truffle.tools.profiler.ShadowStack$1.this$0:Lcom/oracle/truffle/tools/profiler/ShadowStack;
            aload 0 /* this */
            getfield com.oracle.truffle.tools.profiler.ShadowStack$1.val$instrumenter:Lcom/oracle/truffle/api/instrumentation/Instrumenter;
            aload 1 /* context */
            aload 0 /* this */
            getfield com.oracle.truffle.tools.profiler.ShadowStack$1.val$compiledOnly:Z
            invokespecial com.oracle.truffle.tools.profiler.ShadowStack$StackPushPopNode.<init>:(Lcom/oracle/truffle/tools/profiler/ShadowStack;Lcom/oracle/truffle/api/instrumentation/Instrumenter;Lcom/oracle/truffle/api/instrumentation/EventContext;Z)V
            areturn
        end local 2 // com.oracle.truffle.api.nodes.Node instrumentedNode
        end local 1 // com.oracle.truffle.api.instrumentation.EventContext context
        end local 0 // com.oracle.truffle.tools.profiler.ShadowStack$1 this
      LocalVariableTable:
        Start  End  Slot              Name  Signature
            0    5     0              this  Lcom/oracle/truffle/tools/profiler/ShadowStack$1;
            0    5     1           context  Lcom/oracle/truffle/api/instrumentation/EventContext;
            1    5     2  instrumentedNode  Lcom/oracle/truffle/api/nodes/Node;
    MethodParameters:
         Name  Flags
      context  
}
SourceFile: "ShadowStack.java"
EnclosingMethod: com.oracle.truffle.tools.profiler.ShadowStack.install:(Lcom/oracle/truffle/api/instrumentation/Instrumenter;Lcom/oracle/truffle/api/instrumentation/SourceSectionFilter;Z)Lcom/oracle/truffle/api/instrumentation/EventBinding;
NestHost: com.oracle.truffle.tools.profiler.ShadowStack
InnerClasses:
  com.oracle.truffle.tools.profiler.ShadowStack$1
  private StackPushPopNode = com.oracle.truffle.tools.profiler.ShadowStack$StackPushPopNode of com.oracle.truffle.tools.profiler.ShadowStack