8006766: Array-like access to characters of a string is slow
Reviewed-by: lagergren, attila
/*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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package jdk.nashorn.internal.objects;
import static jdk.nashorn.internal.runtime.ECMAErrors.typeError;
import static jdk.nashorn.internal.runtime.linker.Lookup.MH;
import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodHandles;
import jdk.nashorn.internal.objects.annotations.Attribute;
import jdk.nashorn.internal.objects.annotations.Constructor;
import jdk.nashorn.internal.objects.annotations.Function;
import jdk.nashorn.internal.objects.annotations.ScriptClass;
import jdk.nashorn.internal.runtime.JSType;
import jdk.nashorn.internal.runtime.ScriptObject;
import jdk.nashorn.internal.runtime.ScriptRuntime;
import jdk.nashorn.internal.runtime.linker.MethodHandleFactory;
import jdk.nashorn.internal.runtime.linker.PrimitiveLookup;
import org.dynalang.dynalink.linker.GuardedInvocation;
import org.dynalang.dynalink.linker.LinkRequest;
/**
* ECMA 15.6 Boolean Objects.
*/
@ScriptClass("Boolean")
public final class NativeBoolean extends ScriptObject {
private final boolean value;
final static MethodHandle WRAPFILTER = findWrapFilter();
NativeBoolean(final boolean value) {
this(value, Global.instance().getBooleanPrototype());
}
private NativeBoolean(final boolean value, final ScriptObject proto) {
this.value = value;
this.setProto(proto);
}
@Override
public String safeToString() {
return "[Boolean " + toString() + "]";
}
@Override
public String toString() {
return Boolean.toString(getValue());
}
/**
* Get the value for this NativeBoolean
* @return true or false
*/
public boolean getValue() {
return booleanValue();
}
/**
* Get the value for this NativeBoolean
* @return true or false
*/
public boolean booleanValue() {
return value;
}
@Override
public String getClassName() {
return "Boolean";
}
/**
* ECMA 15.6.4.2 Boolean.prototype.toString ( )
*
* @param self self reference
* @return string representation of this boolean
*/
@Function(attributes = Attribute.NOT_ENUMERABLE)
public static Object toString(final Object self) {
return getBoolean(self).toString();
}
/**
* ECMA 15.6.4.3 Boolean.prototype.valueOf ( )
*
* @param self self reference
* @return value of this boolean
*/
@Function(attributes = Attribute.NOT_ENUMERABLE)
public static Object valueOf(final Object self) {
return getBoolean(self);
}
/**
* ECMA 15.6.2.1 new Boolean (value)
*
* @param newObj is the new operator used to instantiate this NativeBoolean
* @param self self reference
* @param value value of boolean
* @return the new NativeBoolean
*/
@Constructor(arity = 1)
public static Object constructor(final boolean newObj, final Object self, final Object value) {
final boolean flag = JSType.toBoolean(value);
if (newObj) {
final ScriptObject proto = (self instanceof ScriptObject) ?
((ScriptObject)self).getProto() :
Global.instance().getBooleanPrototype();
return new NativeBoolean(flag, proto);
}
return flag;
}
private static Boolean getBoolean(final Object self) {
if (self instanceof Boolean) {
return ((Boolean)self);
} else if (self instanceof NativeBoolean) {
return ((NativeBoolean)self).getValue();
} else if (self != null && self == Global.instance().getBooleanPrototype()) {
return false;
} else {
typeError("not.a.boolean", ScriptRuntime.safeToString(self));
return false;
}
}
/**
* Lookup the appropriate method for an invoke dynamic call.
*
* @param request The link request
* @param receiver The receiver for the call
* @return Link to be invoked at call site.
*/
public static GuardedInvocation lookupPrimitive(final LinkRequest request, final Object receiver) {
return PrimitiveLookup.lookupPrimitive(request, Boolean.class, new NativeBoolean((Boolean)receiver), WRAPFILTER);
}
/**
* Wrap a native string in a NativeString object.
*
* @param receiver Native string.
* @return Wrapped object.
*/
@SuppressWarnings("unused")
private static NativeBoolean wrapFilter(final Object receiver) {
return new NativeBoolean((Boolean)receiver);
}
private static MethodHandle findWrapFilter() {
try {
return MethodHandles.lookup().findStatic(NativeBoolean.class, "wrapFilter", MH.type(NativeBoolean.class, Object.class));
} catch (NoSuchMethodException | IllegalAccessException e) {
throw new MethodHandleFactory.LookupException(e);
}
}
}