https://www.graalvm.org/ 
public final class com.oracle.truffle.js.runtime.objects.JSSharedData
  minor version: 0
  major version: 59
  flags: flags: (0x0031) ACC_PUBLIC, ACC_FINAL, ACC_SUPER
  this_class: com.oracle.truffle.js.runtime.objects.JSSharedData
  super_class: java.lang.Object
{
  private final com.oracle.truffle.js.runtime.JSContext context;
    descriptor: Lcom/oracle/truffle/js/runtime/JSContext;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  private final com.oracle.truffle.js.runtime.objects.JSDynamicObject proto;
    descriptor: Lcom/oracle/truffle/js/runtime/objects/JSDynamicObject;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  private com.oracle.truffle.api.Assumption prototypeAssumption;
    descriptor: Lcom/oracle/truffle/api/Assumption;
    flags: (0x0002) ACC_PRIVATE

  private static final com.oracle.truffle.js.runtime.util.DebugCounter prototypeAssumptionsCreated;
    descriptor: Lcom/oracle/truffle/js/runtime/util/DebugCounter;
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL

  private static final com.oracle.truffle.js.runtime.util.DebugCounter prototypeAssumptionsRemoved;
    descriptor: Lcom/oracle/truffle/js/runtime/util/DebugCounter;
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL

  static void <clinit>();
    descriptor: ()V
    flags: (0x0008) ACC_STATIC
    Code:
      stack=1, locals=0, args_size=0
         0: .line 57
            ldc "Prototype assumptions created"
            invokestatic com.oracle.truffle.js.runtime.util.DebugCounter.create:(Ljava/lang/String;)Lcom/oracle/truffle/js/runtime/util/DebugCounter;
            putstatic com.oracle.truffle.js.runtime.objects.JSSharedData.prototypeAssumptionsCreated:Lcom/oracle/truffle/js/runtime/util/DebugCounter;
         1: .line 58
            ldc "Prototype assumptions removed"
            invokestatic com.oracle.truffle.js.runtime.util.DebugCounter.create:(Ljava/lang/String;)Lcom/oracle/truffle/js/runtime/util/DebugCounter;
            putstatic com.oracle.truffle.js.runtime.objects.JSSharedData.prototypeAssumptionsRemoved:Lcom/oracle/truffle/js/runtime/util/DebugCounter;
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  public void <init>(com.oracle.truffle.js.runtime.JSContext, com.oracle.truffle.js.runtime.objects.JSDynamicObject);
    descriptor: (Lcom/oracle/truffle/js/runtime/JSContext;Lcom/oracle/truffle/js/runtime/objects/JSDynamicObject;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=3, args_size=3
        start local 0 // com.oracle.truffle.js.runtime.objects.JSSharedData this
        start local 1 // com.oracle.truffle.js.runtime.JSContext context
        start local 2 // com.oracle.truffle.js.runtime.objects.JSDynamicObject prototype
         0: .line 60
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 61
            aload 0 /* this */
            aload 1 /* context */
            putfield com.oracle.truffle.js.runtime.objects.JSSharedData.context:Lcom/oracle/truffle/js/runtime/JSContext;
         2: .line 62
            aload 0 /* this */
            aload 2 /* prototype */
            putfield com.oracle.truffle.js.runtime.objects.JSSharedData.proto:Lcom/oracle/truffle/js/runtime/objects/JSDynamicObject;
         3: .line 63
            return
        end local 2 // com.oracle.truffle.js.runtime.objects.JSDynamicObject prototype
        end local 1 // com.oracle.truffle.js.runtime.JSContext context
        end local 0 // com.oracle.truffle.js.runtime.objects.JSSharedData this
      LocalVariableTable:
        Start  End  Slot       Name  Signature
            0    4     0       this  Lcom/oracle/truffle/js/runtime/objects/JSSharedData;
            0    4     1    context  Lcom/oracle/truffle/js/runtime/JSContext;
            0    4     2  prototype  Lcom/oracle/truffle/js/runtime/objects/JSDynamicObject;
    MethodParameters:
           Name  Flags
      context    
      prototype  

  com.oracle.truffle.js.runtime.JSContext getContext();
    descriptor: ()Lcom/oracle/truffle/js/runtime/JSContext;
    flags: (0x0000) 
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.oracle.truffle.js.runtime.objects.JSSharedData this
         0: .line 66
            aload 0 /* this */
            getfield com.oracle.truffle.js.runtime.objects.JSSharedData.context:Lcom/oracle/truffle/js/runtime/JSContext;
            areturn
        end local 0 // com.oracle.truffle.js.runtime.objects.JSSharedData this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/js/runtime/objects/JSSharedData;

  public com.oracle.truffle.js.runtime.objects.JSDynamicObject getPrototype();
    descriptor: ()Lcom/oracle/truffle/js/runtime/objects/JSDynamicObject;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.oracle.truffle.js.runtime.objects.JSSharedData this
         0: .line 70
            aload 0 /* this */
            getfield com.oracle.truffle.js.runtime.objects.JSSharedData.proto:Lcom/oracle/truffle/js/runtime/objects/JSDynamicObject;
            areturn
        end local 0 // com.oracle.truffle.js.runtime.objects.JSSharedData this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/js/runtime/objects/JSSharedData;

  synchronized com.oracle.truffle.api.Assumption getPrototypeAssumption();
    descriptor: ()Lcom/oracle/truffle/api/Assumption;
    flags: (0x0020) ACC_SYNCHRONIZED
    Code:
      stack=2, locals=2, args_size=1
        start local 0 // com.oracle.truffle.js.runtime.objects.JSSharedData this
         0: .line 74
            aload 0 /* this */
            getfield com.oracle.truffle.js.runtime.objects.JSSharedData.prototypeAssumption:Lcom/oracle/truffle/api/Assumption;
            astore 1 /* assumption */
        start local 1 // com.oracle.truffle.api.Assumption assumption
         1: .line 75
            aload 1 /* assumption */
            ifnonnull 5
         2: .line 76
            invokestatic com.oracle.truffle.api.Truffle.getRuntime:()Lcom/oracle/truffle/api/TruffleRuntime;
            ldc "stable prototype"
            invokeinterface com.oracle.truffle.api.TruffleRuntime.createAssumption:(Ljava/lang/String;)Lcom/oracle/truffle/api/Assumption;
            astore 1 /* assumption */
         3: .line 77
            aload 0 /* this */
            aload 1 /* assumption */
            putfield com.oracle.truffle.js.runtime.objects.JSSharedData.prototypeAssumption:Lcom/oracle/truffle/api/Assumption;
         4: .line 78
            getstatic com.oracle.truffle.js.runtime.objects.JSSharedData.prototypeAssumptionsCreated:Lcom/oracle/truffle/js/runtime/util/DebugCounter;
            invokevirtual com.oracle.truffle.js.runtime.util.DebugCounter.inc:()V
         5: .line 80
      StackMap locals: com.oracle.truffle.api.Assumption
      StackMap stack:
            aload 1 /* assumption */
            areturn
        end local 1 // com.oracle.truffle.api.Assumption assumption
        end local 0 // com.oracle.truffle.js.runtime.objects.JSSharedData this
      LocalVariableTable:
        Start  End  Slot        Name  Signature
            0    6     0        this  Lcom/oracle/truffle/js/runtime/objects/JSSharedData;
            1    6     1  assumption  Lcom/oracle/truffle/api/Assumption;

  synchronized void invalidatePrototypeAssumption();
    descriptor: ()V
    flags: (0x0020) ACC_SYNCHRONIZED
    Code:
      stack=2, locals=2, args_size=1
        start local 0 // com.oracle.truffle.js.runtime.objects.JSSharedData this
         0: .line 84
            aload 0 /* this */
            getfield com.oracle.truffle.js.runtime.objects.JSSharedData.prototypeAssumption:Lcom/oracle/truffle/api/Assumption;
            astore 1 /* assumption */
        start local 1 // com.oracle.truffle.api.Assumption assumption
         1: .line 85
            aload 1 /* assumption */
            ifnull 5
         2: .line 86
            aload 1 /* assumption */
            invokeinterface com.oracle.truffle.api.Assumption.invalidate:()V
         3: .line 87
            aload 0 /* this */
            getstatic com.oracle.truffle.api.utilities.NeverValidAssumption.INSTANCE:Lcom/oracle/truffle/api/utilities/NeverValidAssumption;
            putfield com.oracle.truffle.js.runtime.objects.JSSharedData.prototypeAssumption:Lcom/oracle/truffle/api/Assumption;
         4: .line 88
            getstatic com.oracle.truffle.js.runtime.objects.JSSharedData.prototypeAssumptionsRemoved:Lcom/oracle/truffle/js/runtime/util/DebugCounter;
            invokevirtual com.oracle.truffle.js.runtime.util.DebugCounter.inc:()V
         5: .line 90
      StackMap locals: com.oracle.truffle.api.Assumption
      StackMap stack:
            return
        end local 1 // com.oracle.truffle.api.Assumption assumption
        end local 0 // com.oracle.truffle.js.runtime.objects.JSSharedData this
      LocalVariableTable:
        Start  End  Slot        Name  Signature
            0    6     0        this  Lcom/oracle/truffle/js/runtime/objects/JSSharedData;
            1    6     1  assumption  Lcom/oracle/truffle/api/Assumption;
}
SourceFile: "JSSharedData.java"