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package jdk.nashorn.internal.runtime;

import static jdk.nashorn.internal.codegen.CompilerConstants.virtualCallNoLookup;

import java.util.concurrent.atomic.LongAdder;
import jdk.nashorn.internal.codegen.CompilerConstants;

A ScriptObject subclass for objects that act as scope.
/** * A {@link ScriptObject} subclass for objects that act as scope. */
public class Scope extends ScriptObject { /* This is used to store return state of split functions. */ private int splitState = -1;
This is updated only in debug mode - counts number of ScriptObject instances created that are scope
/** This is updated only in debug mode - counts number of {@code ScriptObject} instances created that are scope */
private static final LongAdder count = Context.DEBUG ? new LongAdder() : null;
Method handle that points to getSplitState.
/** Method handle that points to {@link Scope#getSplitState}. */
public static final CompilerConstants.Call GET_SPLIT_STATE = virtualCallNoLookup(Scope.class, "getSplitState", int.class);
Method handle that points to setSplitState(int).
/** Method handle that points to {@link Scope#setSplitState(int)}. */
public static final CompilerConstants.Call SET_SPLIT_STATE = virtualCallNoLookup(Scope.class, "setSplitState", void.class, int.class);
Constructor
Params:
  • map – initial property map
/** * Constructor * * @param map initial property map */
public Scope(final PropertyMap map) { super(map); incrementCount(); }
Constructor
Params:
  • proto – parent scope
  • map – initial property map
/** * Constructor * * @param proto parent scope * @param map initial property map */
public Scope(final ScriptObject proto, final PropertyMap map) { super(proto, map); incrementCount(); }
Constructor
Params:
  • map – property map
  • primitiveSpill – primitive spill array
  • objectSpill – reference spill array
/** * Constructor * * @param map property map * @param primitiveSpill primitive spill array * @param objectSpill reference spill array */
public Scope(final PropertyMap map, final long[] primitiveSpill, final Object[] objectSpill) { super(map, primitiveSpill, objectSpill); incrementCount(); } @Override public boolean isScope() { return true; } @Override boolean hasWithScope() { for (ScriptObject obj = this; obj != null; obj = obj.getProto()) { if (obj instanceof WithObject) { return true; } } return false; }
Get the scope's split method state.
Returns:current split state
/** * Get the scope's split method state. * * @return current split state */
public int getSplitState() { return splitState; }
Set the scope's split method state.
Params:
  • state – current split state
/** * Set the scope's split method state. * * @param state current split state */
public void setSplitState(final int state) { splitState = state; }
Get number of Scope instances created. If not running in debug mode this is always 0.
Returns:number of scope ScriptObjects created
/** * Get number of {@code Scope} instances created. If not running in debug * mode this is always 0. * * @return number of scope ScriptObjects created */
public static long getScopeCount() { return count != null ? count.sum() : 0; } private static void incrementCount() { if (Context.DEBUG) { count.increment(); } } }