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package jdk.nashorn.internal.runtime;
import static jdk.nashorn.internal.lookup.Lookup.MH;
import static jdk.nashorn.internal.runtime.ECMAErrors.typeError;
import static jdk.nashorn.internal.runtime.ScriptRuntime.UNDEFINED;
import static jdk.nashorn.internal.runtime.UnwarrantedOptimismException.INVALID_PROGRAM_POINT;
import static jdk.nashorn.internal.runtime.linker.NashornCallSiteDescriptor.CALLSITE_PROGRAM_POINT_SHIFT;

import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodHandles;
import java.lang.invoke.MethodType;
import java.util.concurrent.Callable;
import jdk.nashorn.internal.lookup.Lookup;
import jdk.nashorn.internal.runtime.linker.Bootstrap;
import jdk.nashorn.internal.runtime.linker.NashornCallSiteDescriptor;

Property with user defined getters/setters. Actual getter and setter functions are stored in underlying ScriptObject. Only the 'slot' info is stored in the property.
/** * Property with user defined getters/setters. Actual getter and setter * functions are stored in underlying ScriptObject. Only the 'slot' info is * stored in the property. */
public final class UserAccessorProperty extends SpillProperty { private static final long serialVersionUID = -5928687246526840321L; static final class Accessors { Object getter; Object setter; Accessors(final Object getter, final Object setter) { set(getter, setter); } final void set(final Object getter, final Object setter) { this.getter = getter; this.setter = setter; } @Override public String toString() { return "[getter=" + getter + " setter=" + setter + ']'; } } private static final MethodHandles.Lookup LOOKUP = MethodHandles.lookup();
Getter method handle
/** Getter method handle */
private final static MethodHandle INVOKE_OBJECT_GETTER = findOwnMH_S("invokeObjectGetter", Object.class, Accessors.class, MethodHandle.class, Object.class); private final static MethodHandle INVOKE_INT_GETTER = findOwnMH_S("invokeIntGetter", int.class, Accessors.class, MethodHandle.class, int.class, Object.class); private final static MethodHandle INVOKE_NUMBER_GETTER = findOwnMH_S("invokeNumberGetter", double.class, Accessors.class, MethodHandle.class, int.class, Object.class);
Setter method handle
/** Setter method handle */
private final static MethodHandle INVOKE_OBJECT_SETTER = findOwnMH_S("invokeObjectSetter", void.class, Accessors.class, MethodHandle.class, String.class, Object.class, Object.class); private final static MethodHandle INVOKE_INT_SETTER = findOwnMH_S("invokeIntSetter", void.class, Accessors.class, MethodHandle.class, String.class, Object.class, int.class); private final static MethodHandle INVOKE_NUMBER_SETTER = findOwnMH_S("invokeNumberSetter", void.class, Accessors.class, MethodHandle.class, String.class, Object.class, double.class); private static final Object OBJECT_GETTER_INVOKER_KEY = new Object(); private static MethodHandle getObjectGetterInvoker() { return Context.getGlobal().getDynamicInvoker(OBJECT_GETTER_INVOKER_KEY, new Callable<MethodHandle>() { @Override public MethodHandle call() throws Exception { return getINVOKE_UA_GETTER(Object.class, INVALID_PROGRAM_POINT); } }); } static MethodHandle getINVOKE_UA_GETTER(final Class<?> returnType, final int programPoint) { if (UnwarrantedOptimismException.isValid(programPoint)) { final int flags = NashornCallSiteDescriptor.CALL | NashornCallSiteDescriptor.CALLSITE_OPTIMISTIC | programPoint << CALLSITE_PROGRAM_POINT_SHIFT; return Bootstrap.createDynamicInvoker("", flags, returnType, Object.class, Object.class); } else { return Bootstrap.createDynamicCallInvoker(Object.class, Object.class, Object.class); } } private static final Object OBJECT_SETTER_INVOKER_KEY = new Object(); private static MethodHandle getObjectSetterInvoker() { return Context.getGlobal().getDynamicInvoker(OBJECT_SETTER_INVOKER_KEY, new Callable<MethodHandle>() { @Override public MethodHandle call() throws Exception { return getINVOKE_UA_SETTER(Object.class); } }); } static MethodHandle getINVOKE_UA_SETTER(final Class<?> valueType) { return Bootstrap.createDynamicCallInvoker(void.class, Object.class, Object.class, valueType); }
Constructor
Params:
  • key – property key
  • flags – property flags
  • slot – spill slot
/** * Constructor * * @param key property key * @param flags property flags * @param slot spill slot */
UserAccessorProperty(final Object key, final int flags, final int slot) { // Always set accessor property flag for this class super(key, flags | IS_ACCESSOR_PROPERTY, slot); } private UserAccessorProperty(final UserAccessorProperty property) { super(property); } private UserAccessorProperty(final UserAccessorProperty property, final Class<?> newType) { super(property, newType); } @Override public Property copy() { return new UserAccessorProperty(this); } @Override public Property copy(final Class<?> newType) { return new UserAccessorProperty(this, newType); } void setAccessors(final ScriptObject sobj, final PropertyMap map, final Accessors gs) { try { //invoke the getter and find out super.getSetter(Object.class, map).invokeExact((Object)sobj, (Object)gs); } catch (final Error | RuntimeException t) { throw t; } catch (final Throwable t) { throw new RuntimeException(t); } } //pick the getter setter out of the correct spill slot in sobj Accessors getAccessors(final ScriptObject sobj) { try { //invoke the super getter with this spill slot //get the getter setter from the correct spill slot final Object gs = super.getGetter(Object.class).invokeExact((Object)sobj); return (Accessors)gs; } catch (final Error | RuntimeException t) { throw t; } catch (final Throwable t) { throw new RuntimeException(t); } } @Override protected Class<?> getLocalType() { return Object.class; } @Override public boolean hasGetterFunction(final ScriptObject sobj) { return getAccessors(sobj).getter != null; } @Override public boolean hasSetterFunction(final ScriptObject sobj) { return getAccessors(sobj).setter != null; } @Override public int getIntValue(final ScriptObject self, final ScriptObject owner) { return (int)getObjectValue(self, owner); } @Override public double getDoubleValue(final ScriptObject self, final ScriptObject owner) { return (double)getObjectValue(self, owner); } @Override public Object getObjectValue(final ScriptObject self, final ScriptObject owner) { try { return invokeObjectGetter(getAccessors((owner != null) ? owner : self), getObjectGetterInvoker(), self); } catch (final Error | RuntimeException t) { throw t; } catch (final Throwable t) { throw new RuntimeException(t); } } @Override public void setValue(final ScriptObject self, final ScriptObject owner, final int value, final boolean strict) { setValue(self, owner, (Object) value, strict); } @Override public void setValue(final ScriptObject self, final ScriptObject owner, final double value, final boolean strict) { setValue(self, owner, (Object) value, strict); } @Override public void setValue(final ScriptObject self, final ScriptObject owner, final Object value, final boolean strict) { try { invokeObjectSetter(getAccessors((owner != null) ? owner : self), getObjectSetterInvoker(), strict ? getKey().toString() : null, self, value); } catch (final Error | RuntimeException t) { throw t; } catch (final Throwable t) { throw new RuntimeException(t); } } @Override public MethodHandle getGetter(final Class<?> type) { //this returns a getter on the format (Accessors, Object receiver) return Lookup.filterReturnType(INVOKE_OBJECT_GETTER, type); } @Override public MethodHandle getOptimisticGetter(final Class<?> type, final int programPoint) { if (type == int.class) { return INVOKE_INT_GETTER; } else if (type == double.class) { return INVOKE_NUMBER_GETTER; } else { assert type == Object.class; return INVOKE_OBJECT_GETTER; } } @Override void initMethodHandles(final Class<?> structure) { throw new UnsupportedOperationException(); } @Override public ScriptFunction getGetterFunction(final ScriptObject sobj) { final Object value = getAccessors(sobj).getter; return (value instanceof ScriptFunction) ? (ScriptFunction)value : null; } @Override public MethodHandle getSetter(final Class<?> type, final PropertyMap currentMap) { if (type == int.class) { return INVOKE_INT_SETTER; } else if (type == double.class) { return INVOKE_NUMBER_SETTER; } else { assert type == Object.class; return INVOKE_OBJECT_SETTER; } } @Override public ScriptFunction getSetterFunction(final ScriptObject sobj) { final Object value = getAccessors(sobj).setter; return (value instanceof ScriptFunction) ? (ScriptFunction)value : null; }
Get the getter for the Accessors object. This is the the super Object type getter with Accessors return type.
Returns:The getter handle for the Accessors
/** * Get the getter for the {@code Accessors} object. * This is the the super {@code Object} type getter with {@code Accessors} return type. * * @return The getter handle for the Accessors */
MethodHandle getAccessorsGetter() { return super.getGetter(Object.class).asType(MethodType.methodType(Accessors.class, Object.class)); } // User defined getter and setter are always called by StandardOperation.CALL. Note that the user // getter/setter may be inherited. If so, proto is bound during lookup. In either // inherited or self case, slot is also bound during lookup. Actual ScriptFunction // to be called is retrieved everytime and applied. @SuppressWarnings("unused") private static Object invokeObjectGetter(final Accessors gs, final MethodHandle invoker, final Object self) throws Throwable { final Object func = gs.getter; if (func instanceof ScriptFunction) { return invoker.invokeExact(func, self); } return UNDEFINED; } @SuppressWarnings("unused") private static int invokeIntGetter(final Accessors gs, final MethodHandle invoker, final int programPoint, final Object self) throws Throwable { final Object func = gs.getter; if (func instanceof ScriptFunction) { return (int) invoker.invokeExact(func, self); } throw new UnwarrantedOptimismException(UNDEFINED, programPoint); } @SuppressWarnings("unused") private static double invokeNumberGetter(final Accessors gs, final MethodHandle invoker, final int programPoint, final Object self) throws Throwable { final Object func = gs.getter; if (func instanceof ScriptFunction) { return (double) invoker.invokeExact(func, self); } throw new UnwarrantedOptimismException(UNDEFINED, programPoint); } @SuppressWarnings("unused") private static void invokeObjectSetter(final Accessors gs, final MethodHandle invoker, final String name, final Object self, final Object value) throws Throwable { final Object func = gs.setter; if (func instanceof ScriptFunction) { invoker.invokeExact(func, self, value); } else if (name != null) { throw typeError("property.has.no.setter", name, ScriptRuntime.safeToString(self)); } } @SuppressWarnings("unused") private static void invokeIntSetter(final Accessors gs, final MethodHandle invoker, final String name, final Object self, final int value) throws Throwable { final Object func = gs.setter; if (func instanceof ScriptFunction) { invoker.invokeExact(func, self, value); } else if (name != null) { throw typeError("property.has.no.setter", name, ScriptRuntime.safeToString(self)); } } @SuppressWarnings("unused") private static void invokeNumberSetter(final Accessors gs, final MethodHandle invoker, final String name, final Object self, final double value) throws Throwable { final Object func = gs.setter; if (func instanceof ScriptFunction) { invoker.invokeExact(func, self, value); } else if (name != null) { throw typeError("property.has.no.setter", name, ScriptRuntime.safeToString(self)); } } private static MethodHandle findOwnMH_S(final String name, final Class<?> rtype, final Class<?>... types) { return MH.findStatic(LOOKUP, UserAccessorProperty.class, name, MH.type(rtype, types)); } }