52 import java.lang.invoke.MethodType;
  53 import java.util.EnumSet;
  54 import java.util.Iterator;
  55 import java.util.LinkedList;
  56 import java.util.List;
  57 import jdk.nashorn.internal.codegen.ClassEmitter.Flag;
  58 import jdk.nashorn.internal.codegen.types.Type;
  59 import jdk.nashorn.internal.runtime.AccessorProperty;
  60 import jdk.nashorn.internal.runtime.AllocationStrategy;
  61 import jdk.nashorn.internal.runtime.Context;
  62 import jdk.nashorn.internal.runtime.FunctionScope;
  63 import jdk.nashorn.internal.runtime.JSType;
  64 import jdk.nashorn.internal.runtime.PropertyMap;
  65 import jdk.nashorn.internal.runtime.ScriptEnvironment;
  66 import jdk.nashorn.internal.runtime.ScriptObject;
  67 import jdk.nashorn.internal.runtime.Undefined;
  68 import jdk.nashorn.internal.runtime.UnwarrantedOptimismException;
  69 import jdk.nashorn.internal.runtime.logging.DebugLogger;
  70 import jdk.nashorn.internal.runtime.logging.Loggable;
  71 import jdk.nashorn.internal.runtime.logging.Logger;
  72 import jdk.nashorn.internal.runtime.options.Options;
  73 
  74 /**
  75  * Generates the ScriptObject subclass structure with fields for a user objects.
  76  */
  77 @Logger(name="fields")
  78 public final class ObjectClassGenerator implements Loggable {
  79 
  80     /**
  81      * Type guard to make sure we don't unnecessarily explode field storages. Rather unbox e.g.
  82      * a java.lang.Number than blow up the field. Gradually, optimistic types should create almost
  83      * no boxed types
  84      */
  85     private static final MethodHandle IS_TYPE_GUARD = findOwnMH("isType", boolean.class, Class.class, Object.class);
  86 
  87     /**
  88      * Marker for scope parameters
  89      */
  90     private static final String SCOPE_MARKER = "P";
  91 
  92     /**

  52 import java.lang.invoke.MethodType;
  53 import java.util.EnumSet;
  54 import java.util.Iterator;
  55 import java.util.LinkedList;
  56 import java.util.List;
  57 import jdk.nashorn.internal.codegen.ClassEmitter.Flag;
  58 import jdk.nashorn.internal.codegen.types.Type;
  59 import jdk.nashorn.internal.runtime.AccessorProperty;
  60 import jdk.nashorn.internal.runtime.AllocationStrategy;
  61 import jdk.nashorn.internal.runtime.Context;
  62 import jdk.nashorn.internal.runtime.FunctionScope;
  63 import jdk.nashorn.internal.runtime.JSType;
  64 import jdk.nashorn.internal.runtime.PropertyMap;
  65 import jdk.nashorn.internal.runtime.ScriptEnvironment;
  66 import jdk.nashorn.internal.runtime.ScriptObject;
  67 import jdk.nashorn.internal.runtime.Undefined;
  68 import jdk.nashorn.internal.runtime.UnwarrantedOptimismException;
  69 import jdk.nashorn.internal.runtime.logging.DebugLogger;
  70 import jdk.nashorn.internal.runtime.logging.Loggable;
  71 import jdk.nashorn.internal.runtime.logging.Logger;

  72 
  73 /**
  74  * Generates the ScriptObject subclass structure with fields for a user objects.
  75  */
  76 @Logger(name="fields")
  77 public final class ObjectClassGenerator implements Loggable {
  78 
  79     /**
  80      * Type guard to make sure we don't unnecessarily explode field storages. Rather unbox e.g.
  81      * a java.lang.Number than blow up the field. Gradually, optimistic types should create almost
  82      * no boxed types
  83      */
  84     private static final MethodHandle IS_TYPE_GUARD = findOwnMH("isType", boolean.class, Class.class, Object.class);
  85 
  86     /**
  87      * Marker for scope parameters
  88      */
  89     private static final String SCOPE_MARKER = "P";
  90 
  91     /**