1 /*
2 * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package jdk.nashorn.internal.runtime;
27
28 import static jdk.nashorn.internal.codegen.CompilerConstants.staticCallNoLookup;
29 import static jdk.nashorn.internal.codegen.CompilerConstants.virtualCall;
30 import static jdk.nashorn.internal.codegen.CompilerConstants.virtualCallNoLookup;
31 import static jdk.nashorn.internal.lookup.Lookup.MH;
32 import static jdk.nashorn.internal.runtime.ECMAErrors.referenceError;
33 import static jdk.nashorn.internal.runtime.ECMAErrors.typeError;
34 import static jdk.nashorn.internal.runtime.JSType.UNDEFINED_DOUBLE;
35 import static jdk.nashorn.internal.runtime.JSType.UNDEFINED_INT;
36 import static jdk.nashorn.internal.runtime.PropertyDescriptor.CONFIGURABLE;
37 import static jdk.nashorn.internal.runtime.PropertyDescriptor.ENUMERABLE;
38 import static jdk.nashorn.internal.runtime.PropertyDescriptor.GET;
39 import static jdk.nashorn.internal.runtime.PropertyDescriptor.SET;
40 import static jdk.nashorn.internal.runtime.PropertyDescriptor.VALUE;
41 import static jdk.nashorn.internal.runtime.PropertyDescriptor.WRITABLE;
42 import static jdk.nashorn.internal.runtime.ScriptRuntime.UNDEFINED;
43 import static jdk.nashorn.internal.runtime.UnwarrantedOptimismException.INVALID_PROGRAM_POINT;
44 import static jdk.nashorn.internal.runtime.UnwarrantedOptimismException.isValid;
45 import static jdk.nashorn.internal.runtime.arrays.ArrayIndex.getArrayIndex;
46 import static jdk.nashorn.internal.runtime.arrays.ArrayIndex.isValidArrayIndex;
47 import static jdk.nashorn.internal.runtime.linker.NashornCallSiteDescriptor.isScopeFlag;
48 import static jdk.nashorn.internal.runtime.linker.NashornCallSiteDescriptor.isStrictFlag;
49 import static jdk.nashorn.internal.runtime.linker.NashornGuards.explicitInstanceOfCheck;
50
51 import java.lang.invoke.MethodHandle;
52 import java.lang.invoke.MethodHandles;
53 import java.lang.invoke.MethodType;
54 import java.lang.invoke.SwitchPoint;
55 import java.lang.reflect.Array;
56 import java.util.AbstractMap;
57 import java.util.ArrayList;
58 import java.util.Arrays;
59 import java.util.Collection;
60 import java.util.Collections;
61 import java.util.HashSet;
62 import java.util.Iterator;
63 import java.util.LinkedHashSet;
64 import java.util.List;
65 import java.util.Map;
66 import java.util.Set;
67 import java.util.concurrent.atomic.LongAdder;
68 import jdk.dynalink.CallSiteDescriptor;
69 import jdk.dynalink.NamedOperation;
70 import jdk.dynalink.StandardOperation;
71 import jdk.dynalink.linker.GuardedInvocation;
72 import jdk.dynalink.linker.LinkRequest;
73 import jdk.nashorn.internal.codegen.CompilerConstants.Call;
74 import jdk.nashorn.internal.codegen.ObjectClassGenerator;
75 import jdk.nashorn.internal.codegen.types.Type;
76 import jdk.nashorn.internal.lookup.Lookup;
77 import jdk.nashorn.internal.objects.AccessorPropertyDescriptor;
78 import jdk.nashorn.internal.objects.DataPropertyDescriptor;
79 import jdk.nashorn.internal.objects.Global;
80 import jdk.nashorn.internal.objects.NativeArray;
81 import jdk.nashorn.internal.runtime.arrays.ArrayData;
82 import jdk.nashorn.internal.runtime.arrays.ArrayIndex;
83 import jdk.nashorn.internal.runtime.linker.Bootstrap;
84 import jdk.nashorn.internal.runtime.linker.LinkerCallSite;
85 import jdk.nashorn.internal.runtime.linker.NashornCallSiteDescriptor;
86 import jdk.nashorn.internal.runtime.linker.NashornGuards;
87
88 /**
89 * Base class for generic JavaScript objects.
90 * <p>
91 * Notes:
92 * <ul>
93 * <li>The map is used to identify properties in the object.</li>
94 * <li>If the map is modified then it must be cloned and replaced. This notifies
95 * any code that made assumptions about the object that things have changed.
96 * Ex. CallSites that have been validated must check to see if the map has
97 * changed (or a map from a different object type) and hence relink the method
98 * to call.</li>
99 * <li>Modifications of the map include adding/deleting attributes or changing a
100 * function field value.</li>
101 * </ul>
102 */
103
104 public abstract class ScriptObject implements PropertyAccess, Cloneable {
105 /** __proto__ special property name inside object literals. ES6 draft. */
106 public static final String PROTO_PROPERTY_NAME = "__proto__";
107
108 /** Search fall back routine name for "no such method" */
109 public static final String NO_SUCH_METHOD_NAME = "__noSuchMethod__";
110
111 /** Search fall back routine name for "no such property" */
112 public static final String NO_SUCH_PROPERTY_NAME = "__noSuchProperty__";
113
114 /** Per ScriptObject flag - is this an array object? */
115 public static final int IS_ARRAY = 1 << 0;
116
117 /** Per ScriptObject flag - is this an arguments object? */
118 public static final int IS_ARGUMENTS = 1 << 1;
119
120 /** Is length property not-writable? */
121 public static final int IS_LENGTH_NOT_WRITABLE = 1 << 2;
122
123 /** Is this a builtin object? */
124 public static final int IS_BUILTIN = 1 << 3;
125
126 /**
127 * Spill growth rate - by how many elements does {@link ScriptObject#primitiveSpill} and
128 * {@link ScriptObject#objectSpill} when full
129 */
130 public static final int SPILL_RATE = 8;
131
132 /** Map to property information and accessor functions. Ordered by insertion. */
133 private PropertyMap map;
134
135 /** objects proto. */
136 private ScriptObject proto;
137
138 /** Object flags. */
139 private int flags;
140
141 /** Area for primitive properties added to object after instantiation, see {@link AccessorProperty} */
142 protected long[] primitiveSpill;
143
144 /** Area for reference properties added to object after instantiation, see {@link AccessorProperty} */
145 protected Object[] objectSpill;
146
147 /** Indexed array data. */
148 private ArrayData arrayData;
149
150 /** Method handle to retrieve prototype of this object */
151 public static final MethodHandle GETPROTO = findOwnMH_V("getProto", ScriptObject.class);
152
153 static final MethodHandle MEGAMORPHIC_GET = findOwnMH_V("megamorphicGet", Object.class, String.class, boolean.class, boolean.class);
154 static final MethodHandle GLOBALFILTER = findOwnMH_S("globalFilter", Object.class, Object.class);
155 static final MethodHandle DECLARE_AND_SET = findOwnMH_V("declareAndSet", void.class, String.class, Object.class);
156
157 private static final MethodHandle TRUNCATINGFILTER = findOwnMH_S("truncatingFilter", Object[].class, int.class, Object[].class);
158 private static final MethodHandle KNOWNFUNCPROPGUARDSELF = findOwnMH_S("knownFunctionPropertyGuardSelf", boolean.class, Object.class, PropertyMap.class, MethodHandle.class, ScriptFunction.class);
159 private static final MethodHandle KNOWNFUNCPROPGUARDPROTO = findOwnMH_S("knownFunctionPropertyGuardProto", boolean.class, Object.class, PropertyMap.class, MethodHandle.class, int.class, ScriptFunction.class);
160
161 private static final ArrayList<MethodHandle> PROTO_FILTERS = new ArrayList<>();
162
163 /** Method handle for getting the array data */
164 public static final Call GET_ARRAY = virtualCall(MethodHandles.lookup(), ScriptObject.class, "getArray", ArrayData.class);
165
166 /** Method handle for getting a function argument at a given index. Used from MapCreator */
167 public static final Call GET_ARGUMENT = virtualCall(MethodHandles.lookup(), ScriptObject.class, "getArgument", Object.class, int.class);
168
169 /** Method handle for setting a function argument at a given index. Used from MapCreator */
170 public static final Call SET_ARGUMENT = virtualCall(MethodHandles.lookup(), ScriptObject.class, "setArgument", void.class, int.class, Object.class);
171
172 /** Method handle for getting the proto of a ScriptObject */
173 public static final Call GET_PROTO = virtualCallNoLookup(ScriptObject.class, "getProto", ScriptObject.class);
174
175 /** Method handle for getting the proto of a ScriptObject */
176 public static final Call GET_PROTO_DEPTH = virtualCallNoLookup(ScriptObject.class, "getProto", ScriptObject.class, int.class);
177
178 /** Method handle for setting the proto of a ScriptObject */
179 public static final Call SET_GLOBAL_OBJECT_PROTO = staticCallNoLookup(ScriptObject.class, "setGlobalObjectProto", void.class, ScriptObject.class);
180
181 /** Method handle for setting the proto of a ScriptObject after checking argument */
182 public static final Call SET_PROTO_FROM_LITERAL = virtualCallNoLookup(ScriptObject.class, "setProtoFromLiteral", void.class, Object.class);
183
184 /** Method handle for setting the user accessors of a ScriptObject */
185 //TODO fastpath this
186 public static final Call SET_USER_ACCESSORS = virtualCall(MethodHandles.lookup(), ScriptObject.class, "setUserAccessors", void.class, String.class, ScriptFunction.class, ScriptFunction.class);
187
188 static final MethodHandle[] SET_SLOW = new MethodHandle[] {
189 findOwnMH_V("set", void.class, Object.class, int.class, int.class),
190 findOwnMH_V("set", void.class, Object.class, double.class, int.class),
191 findOwnMH_V("set", void.class, Object.class, Object.class, int.class)
192 };
193
194 /** Method handle to reset the map of this ScriptObject */
195 public static final Call SET_MAP = virtualCallNoLookup(ScriptObject.class, "setMap", void.class, PropertyMap.class);
196
197 static final MethodHandle CAS_MAP = findOwnMH_V("compareAndSetMap", boolean.class, PropertyMap.class, PropertyMap.class);
198 static final MethodHandle EXTENSION_CHECK = findOwnMH_V("extensionCheck", boolean.class, boolean.class, String.class);
199 static final MethodHandle ENSURE_SPILL_SIZE = findOwnMH_V("ensureSpillSize", Object.class, int.class);
200
201 /**
202 * Constructor
203 */
204 public ScriptObject() {
205 this(null);
206 }
207
208 /**
209 * Constructor
210 *
211 * @param map {@link PropertyMap} used to create the initial object
212 */
213 public ScriptObject(final PropertyMap map) {
214 if (Context.DEBUG) {
215 ScriptObject.count.increment();
216 }
217 this.arrayData = ArrayData.EMPTY_ARRAY;
218 this.setMap(map == null ? PropertyMap.newMap() : map);
219 }
220
221 /**
222 * Constructor that directly sets the prototype to {@code proto} and property map to
223 * {@code map} without invalidating the map as calling {@link #setProto(ScriptObject)}
224 * would do. This should only be used for objects that are always constructed with the
225 * same combination of prototype and property map.
226 *
227 * @param proto the prototype object
228 * @param map initial {@link PropertyMap}
229 */
230 protected ScriptObject(final ScriptObject proto, final PropertyMap map) {
231 this(map);
232 this.proto = proto;
233 }
234
235 /**
236 * Constructor used to instantiate spill properties directly. Used from
237 * SpillObjectCreator.
238 *
239 * @param map property maps
240 * @param primitiveSpill primitive spills
241 * @param objectSpill reference spills
242 */
243 public ScriptObject(final PropertyMap map, final long[] primitiveSpill, final Object[] objectSpill) {
244 this(map);
245 this.primitiveSpill = primitiveSpill;
246 this.objectSpill = objectSpill;
247 assert primitiveSpill == null || primitiveSpill.length == objectSpill.length : " primitive spill pool size is not the same length as object spill pool size";
248 }
249
250 /**
251 * Check whether this is a global object
252 * @return true if global
253 */
254 protected boolean isGlobal() {
255 return false;
256 }
257
258 private static int alignUp(final int size, final int alignment) {
259 return size + alignment - 1 & ~(alignment - 1);
260 }
261
262 /**
263 * Given a number of properties, return the aligned to SPILL_RATE
264 * buffer size required for the smallest spill pool needed to
265 * house them
266 * @param nProperties number of properties
267 * @return property buffer length, a multiple of SPILL_RATE
268 */
269 public static int spillAllocationLength(final int nProperties) {
270 return alignUp(nProperties, SPILL_RATE);
271 }
272
273 /**
274 * Copy all properties from the source object with their receiver bound to the source.
275 * This function was known as mergeMap
276 *
277 * @param source The source object to copy from.
278 */
279 public void addBoundProperties(final ScriptObject source) {
280 addBoundProperties(source, source.getMap().getProperties());
281 }
282
283 /**
284 * Copy all properties from the array with their receiver bound to the source.
285 *
286 * @param source The source object to copy from.
287 * @param properties The array of properties to copy.
288 */
289 public void addBoundProperties(final ScriptObject source, final Property[] properties) {
290 PropertyMap newMap = this.getMap();
291 final boolean extensible = newMap.isExtensible();
292
293 for (final Property property : properties) {
294 newMap = addBoundProperty(newMap, source, property, extensible);
295 }
296
297 this.setMap(newMap);
298 }
299
300 /**
301 * Add a bound property from {@code source}, using the interim property map {@code propMap}, and return the
302 * new interim property map.
303 *
304 * @param propMap the property map
305 * @param source the source object
306 * @param property the property to be added
307 * @param extensible whether the current object is extensible or not
308 * @return the new property map
309 */
310 protected PropertyMap addBoundProperty(final PropertyMap propMap, final ScriptObject source, final Property property, final boolean extensible) {
311 PropertyMap newMap = propMap;
312 final Object key = property.getKey();
313 final Property oldProp = newMap.findProperty(key);
314 if (oldProp == null) {
315 if (! extensible) {
316 throw typeError("object.non.extensible", key.toString(), ScriptRuntime.safeToString(this));
317 }
318
319 if (property instanceof UserAccessorProperty) {
320 // Note: we copy accessor functions to this object which is semantically different from binding.
321 final UserAccessorProperty prop = this.newUserAccessors(key, property.getFlags(), property.getGetterFunction(source), property.getSetterFunction(source));
322 newMap = newMap.addPropertyNoHistory(prop);
323 } else {
324 newMap = newMap.addPropertyBind((AccessorProperty)property, source);
325 }
326 } else {
327 // See ECMA section 10.5 Declaration Binding Instantiation
328 // step 5 processing each function declaration.
329 if (property.isFunctionDeclaration() && !oldProp.isConfigurable()) {
330 if (oldProp instanceof UserAccessorProperty ||
331 !(oldProp.isWritable() && oldProp.isEnumerable())) {
332 throw typeError("cant.redefine.property", key.toString(), ScriptRuntime.safeToString(this));
333 }
334 }
335 }
336 return newMap;
337 }
338
339 /**
340 * Copy all properties from the array with their receiver bound to the source.
341 *
342 * @param source The source object to copy from.
343 * @param properties The collection of accessor properties to copy.
344 */
345 public void addBoundProperties(final Object source, final AccessorProperty[] properties) {
346 PropertyMap newMap = this.getMap();
347 final boolean extensible = newMap.isExtensible();
348
349 for (final AccessorProperty property : properties) {
350 final Object key = property.getKey();
351
352 if (newMap.findProperty(key) == null) {
353 if (! extensible) {
354 throw typeError("object.non.extensible", key.toString(), ScriptRuntime.safeToString(this));
355 }
356 newMap = newMap.addPropertyBind(property, source);
357 }
358 }
359
360 this.setMap(newMap);
361 }
362
363 /**
364 * Bind the method handle to the specified receiver, while preserving its original type (it will just ignore the
365 * first argument in lieu of the bound argument).
366 * @param methodHandle Method handle to bind to.
367 * @param receiver Object to bind.
368 * @return Bound method handle.
369 */
370 static MethodHandle bindTo(final MethodHandle methodHandle, final Object receiver) {
371 return MH.dropArguments(MH.bindTo(methodHandle, receiver), 0, methodHandle.type().parameterType(0));
372 }
373
374 /**
375 * Return a property iterator.
376 * @return Property iterator.
377 */
378 public Iterator<String> propertyIterator() {
379 return new KeyIterator(this);
380 }
381
382 /**
383 * Return a property value iterator.
384 * @return Property value iterator.
385 */
386 public Iterator<Object> valueIterator() {
387 return new ValueIterator(this);
388 }
389
390 /**
391 * ECMA 8.10.1 IsAccessorDescriptor ( Desc )
392 * @return true if this has a {@link AccessorPropertyDescriptor} with a getter or a setter
393 */
394 public final boolean isAccessorDescriptor() {
395 return has(GET) || has(SET);
396 }
397
398 /**
399 * ECMA 8.10.2 IsDataDescriptor ( Desc )
400 * @return true if this has a {@link DataPropertyDescriptor}, i.e. the object has a property value and is writable
401 */
402 public final boolean isDataDescriptor() {
403 return has(VALUE) || has(WRITABLE);
404 }
405
406 /**
407 * ECMA 8.10.5 ToPropertyDescriptor ( Obj )
408 *
409 * @return property descriptor
410 */
411 public final PropertyDescriptor toPropertyDescriptor() {
412 final Global global = Context.getGlobal();
413
414 final PropertyDescriptor desc;
415 if (isDataDescriptor()) {
416 if (has(SET) || has(GET)) {
417 throw typeError(global, "inconsistent.property.descriptor");
418 }
419
420 desc = global.newDataDescriptor(UNDEFINED, false, false, false);
421 } else if (isAccessorDescriptor()) {
422 if (has(VALUE) || has(WRITABLE)) {
423 throw typeError(global, "inconsistent.property.descriptor");
424 }
425
426 desc = global.newAccessorDescriptor(UNDEFINED, UNDEFINED, false, false);
427 } else {
428 desc = global.newGenericDescriptor(false, false);
429 }
430
431 return desc.fillFrom(this);
432 }
433
434 /**
435 * ECMA 8.10.5 ToPropertyDescriptor ( Obj )
436 *
437 * @param global global scope object
438 * @param obj object to create property descriptor from
439 *
440 * @return property descriptor
441 */
442 public static PropertyDescriptor toPropertyDescriptor(final Global global, final Object obj) {
443 if (obj instanceof ScriptObject) {
444 return ((ScriptObject)obj).toPropertyDescriptor();
445 }
446
447 throw typeError(global, "not.an.object", ScriptRuntime.safeToString(obj));
448 }
449
450 /**
451 * ECMA 8.12.1 [[GetOwnProperty]] (P)
452 *
453 * @param key property key
454 *
455 * @return Returns the Property Descriptor of the named own property of this
456 * object, or undefined if absent.
457 */
458 public Object getOwnPropertyDescriptor(final Object key) {
459 final Property property = getMap().findProperty(key);
460
461 final Global global = Context.getGlobal();
462
463 if (property != null) {
464 final ScriptFunction get = property.getGetterFunction(this);
465 final ScriptFunction set = property.getSetterFunction(this);
466
467 final boolean configurable = property.isConfigurable();
468 final boolean enumerable = property.isEnumerable();
469 final boolean writable = property.isWritable();
470
471 if (property instanceof UserAccessorProperty) {
472 return global.newAccessorDescriptor(
473 get != null ?
474 get :
475 UNDEFINED,
476 set != null ?
477 set :
478 UNDEFINED,
479 configurable,
480 enumerable);
481 }
482
483 return global.newDataDescriptor(getWithProperty(property), configurable, enumerable, writable);
484 }
485
486 final int index = getArrayIndex(key);
487 final ArrayData array = getArray();
488
489 if (array.has(index)) {
490 return array.getDescriptor(global, index);
491 }
492
493 return UNDEFINED;
494 }
495
496 /**
497 * ECMA 8.12.2 [[GetProperty]] (P)
498 *
499 * @param key property key
500 *
501 * @return Returns the fully populated Property Descriptor of the named property
502 * of this object, or undefined if absent.
503 */
504 public Object getPropertyDescriptor(final String key) {
505 final Object res = getOwnPropertyDescriptor(key);
506
507 if (res != UNDEFINED) {
508 return res;
509 } else if (getProto() != null) {
510 return getProto().getOwnPropertyDescriptor(key);
511 } else {
512 return UNDEFINED;
513 }
514 }
515
516 /**
517 * Invalidate any existing global constant method handles that may exist for {@code key}.
518 * @param key the property name
519 */
520 protected void invalidateGlobalConstant(final Object key) {
521 final GlobalConstants globalConstants = getGlobalConstants();
522 if (globalConstants != null) {
523 globalConstants.delete(key);
524 }
525 }
526
527 /**
528 * ECMA 8.12.9 [[DefineOwnProperty]] (P, Desc, Throw)
529 *
530 * @param key the property key
531 * @param propertyDesc the property descriptor
532 * @param reject is the property extensible - true means new definitions are rejected
533 *
534 * @return true if property was successfully defined
535 */
536 public boolean defineOwnProperty(final Object key, final Object propertyDesc, final boolean reject) {
537 final Global global = Context.getGlobal();
538 final PropertyDescriptor desc = toPropertyDescriptor(global, propertyDesc);
539 final Object current = getOwnPropertyDescriptor(key);
540
541 invalidateGlobalConstant(key);
542
543 if (current == UNDEFINED) {
544 if (isExtensible()) {
545 // add a new own property
546 addOwnProperty(key, desc);
547 return true;
548 }
549 // new property added to non-extensible object
550 if (reject) {
551 throw typeError(global, "object.non.extensible", key.toString(), ScriptRuntime.safeToString(this));
552 }
553 return false;
554 }
555
556 // modifying an existing property
557 final PropertyDescriptor currentDesc = (PropertyDescriptor)current;
558 final PropertyDescriptor newDesc = desc;
559
560 if (newDesc.type() == PropertyDescriptor.GENERIC && !newDesc.has(CONFIGURABLE) && !newDesc.has(ENUMERABLE)) {
561 // every descriptor field is absent
562 return true;
563 }
564
565 if (newDesc.hasAndEquals(currentDesc)) {
566 // every descriptor field of the new is same as the current
567 return true;
568 }
569
570 if (!currentDesc.isConfigurable()) {
571 if (newDesc.has(CONFIGURABLE) && newDesc.isConfigurable()) {
572 // not configurable can not be made configurable
573 if (reject) {
574 throw typeError(global, "cant.redefine.property", key.toString(), ScriptRuntime.safeToString(this));
575 }
576 return false;
577 }
578
579 if (newDesc.has(ENUMERABLE) &&
580 currentDesc.isEnumerable() != newDesc.isEnumerable()) {
581 // cannot make non-enumerable as enumerable or vice-versa
582 if (reject) {
583 throw typeError(global, "cant.redefine.property", key.toString(), ScriptRuntime.safeToString(this));
584 }
585 return false;
586 }
587 }
588
589 int propFlags = Property.mergeFlags(currentDesc, newDesc);
590 Property property = getMap().findProperty(key);
591
592 if (currentDesc.type() == PropertyDescriptor.DATA &&
593 (newDesc.type() == PropertyDescriptor.DATA ||
594 newDesc.type() == PropertyDescriptor.GENERIC)) {
595 if (!currentDesc.isConfigurable() && !currentDesc.isWritable()) {
596 if (newDesc.has(WRITABLE) && newDesc.isWritable() ||
597 newDesc.has(VALUE) && !ScriptRuntime.sameValue(currentDesc.getValue(), newDesc.getValue())) {
598 if (reject) {
599 throw typeError(global, "cant.redefine.property", key.toString(), ScriptRuntime.safeToString(this));
600 }
601 return false;
602 }
603 }
604
605 final boolean newValue = newDesc.has(VALUE);
606 final Object value = newValue ? newDesc.getValue() : currentDesc.getValue();
607
608 if (newValue && property != null) {
609 // Temporarily clear flags.
610 property = modifyOwnProperty(property, 0);
611 set(key, value, 0);
612 //this might change the map if we change types of the property
613 //hence we need to read it again. note that we should probably
614 //have the setter return the new property throughout and in
615 //general respect Property return values from modify and add
616 //functions - which we don't seem to do at all here :-(
617 //There is already a bug filed to generify PropertyAccess so we
618 //can have the setter return e.g. a Property
619 property = getMap().findProperty(key);
620 }
621
622 if (property == null) {
623 // promoting an arrayData value to actual property
624 addOwnProperty(key, propFlags, value);
625 checkIntegerKey(key);
626 } else {
627 // Now set the new flags
628 modifyOwnProperty(property, propFlags);
629 }
630 } else if (currentDesc.type() == PropertyDescriptor.ACCESSOR &&
631 (newDesc.type() == PropertyDescriptor.ACCESSOR ||
632 newDesc.type() == PropertyDescriptor.GENERIC)) {
633 if (!currentDesc.isConfigurable()) {
634 if (newDesc.has(PropertyDescriptor.GET) && !ScriptRuntime.sameValue(currentDesc.getGetter(), newDesc.getGetter()) ||
635 newDesc.has(PropertyDescriptor.SET) && !ScriptRuntime.sameValue(currentDesc.getSetter(), newDesc.getSetter())) {
636 if (reject) {
637 throw typeError(global, "cant.redefine.property", key.toString(), ScriptRuntime.safeToString(this));
638 }
639 return false;
640 }
641 }
642 // New set the new features.
643 modifyOwnProperty(property, propFlags,
644 newDesc.has(GET) ? newDesc.getGetter() : currentDesc.getGetter(),
645 newDesc.has(SET) ? newDesc.getSetter() : currentDesc.getSetter());
646 } else {
647 // changing descriptor type
648 if (!currentDesc.isConfigurable()) {
649 // not configurable can not be made configurable
650 if (reject) {
651 throw typeError(global, "cant.redefine.property", key.toString(), ScriptRuntime.safeToString(this));
652 }
653 return false;
654 }
655
656 propFlags = 0;
657
658 // Preserve only configurable and enumerable from current desc
659 // if those are not overridden in the new property descriptor.
660 boolean value = newDesc.has(CONFIGURABLE) ? newDesc.isConfigurable() : currentDesc.isConfigurable();
661 if (!value) {
662 propFlags |= Property.NOT_CONFIGURABLE;
663 }
664 value = newDesc.has(ENUMERABLE)? newDesc.isEnumerable() : currentDesc.isEnumerable();
665 if (!value) {
666 propFlags |= Property.NOT_ENUMERABLE;
667 }
668
669 final int type = newDesc.type();
670 if (type == PropertyDescriptor.DATA) {
671 // get writable from the new descriptor
672 value = newDesc.has(WRITABLE) && newDesc.isWritable();
673 if (!value) {
674 propFlags |= Property.NOT_WRITABLE;
675 }
676
677 // delete the old property
678 deleteOwnProperty(property);
679 // add new data property
680 addOwnProperty(key, propFlags, newDesc.getValue());
681 } else if (type == PropertyDescriptor.ACCESSOR) {
682 if (property == null) {
683 addOwnProperty(key, propFlags,
684 newDesc.has(GET) ? newDesc.getGetter() : null,
685 newDesc.has(SET) ? newDesc.getSetter() : null);
686 } else {
687 // Modify old property with the new features.
688 modifyOwnProperty(property, propFlags,
689 newDesc.has(GET) ? newDesc.getGetter() : null,
690 newDesc.has(SET) ? newDesc.getSetter() : null);
691 }
692 }
693 }
694
695 checkIntegerKey(key);
696
697 return true;
698 }
699
700 /**
701 * Almost like defineOwnProperty(int,Object) for arrays this one does
702 * not add 'gap' elements (like the array one does).
703 *
704 * @param index key for property
705 * @param value value to define
706 */
707 public void defineOwnProperty(final int index, final Object value) {
708 assert isValidArrayIndex(index) : "invalid array index";
709 final long longIndex = ArrayIndex.toLongIndex(index);
710 final long oldLength = getArray().length();
711 if (longIndex >= oldLength) {
712 setArray(getArray().ensure(longIndex).safeDelete(oldLength, longIndex - 1, false));
713 }
714 setArray(getArray().set(index, value, false));
715 }
716
717 private void checkIntegerKey(final Object key) {
718 final int index = getArrayIndex(key);
719
720 if (isValidArrayIndex(index)) {
721 final ArrayData data = getArray();
722
723 if (data.has(index)) {
724 setArray(data.delete(index));
725 }
726 }
727 }
728
729 /**
730 * Add a new property to the object.
731 *
732 * @param key property key
733 * @param propertyDesc property descriptor for property
734 */
735 public final void addOwnProperty(final Object key, final PropertyDescriptor propertyDesc) {
736 // Already checked that there is no own property with that key.
737 PropertyDescriptor pdesc = propertyDesc;
738
739 final int propFlags = Property.toFlags(pdesc);
740
741 if (pdesc.type() == PropertyDescriptor.GENERIC) {
742 final Global global = Context.getGlobal();
743 final PropertyDescriptor dDesc = global.newDataDescriptor(UNDEFINED, false, false, false);
744
745 dDesc.fillFrom((ScriptObject)pdesc);
746 pdesc = dDesc;
747 }
748
749 final int type = pdesc.type();
750 if (type == PropertyDescriptor.DATA) {
751 addOwnProperty(key, propFlags, pdesc.getValue());
752 } else if (type == PropertyDescriptor.ACCESSOR) {
753 addOwnProperty(key, propFlags,
754 pdesc.has(GET) ? pdesc.getGetter() : null,
755 pdesc.has(SET) ? pdesc.getSetter() : null);
756 }
757
758 checkIntegerKey(key);
759 }
760
761 /**
762 * Low level property API (not using property descriptors)
763 * <p>
764 * Find a property in the prototype hierarchy. Note: this is final and not
765 * a good idea to override. If you have to, use
766 * {jdk.nashorn.internal.objects.NativeArray{@link #getProperty(String)} or
767 * {jdk.nashorn.internal.objects.NativeArray{@link #getPropertyDescriptor(String)} as the
768 * overriding way to find array properties
769 *
770 * @see jdk.nashorn.internal.objects.NativeArray
771 *
772 * @param key Property key.
773 * @param deep Whether the search should look up proto chain.
774 *
775 * @return FindPropertyData or null if not found.
776 */
777 public final FindProperty findProperty(final Object key, final boolean deep) {
778 return findProperty(key, deep, this);
779 }
780
781 /**
782 * Low level property API (not using property descriptors)
783 * <p>
784 * Find a property in the prototype hierarchy. Note: this is not a good idea
785 * to override except as it was done in {@link WithObject}.
786 * If you have to, use
787 * {jdk.nashorn.internal.objects.NativeArray{@link #getProperty(String)} or
788 * {jdk.nashorn.internal.objects.NativeArray{@link #getPropertyDescriptor(String)} as the
789 * overriding way to find array properties
790 *
791 * @see jdk.nashorn.internal.objects.NativeArray
792 *
793 * @param key Property key.
794 * @param deep Whether the search should look up proto chain.
795 * @param start the object on which the lookup was originally initiated
796 *
797 * @return FindPropertyData or null if not found.
798 */
799 protected FindProperty findProperty(final Object key, final boolean deep, final ScriptObject start) {
800
801 final PropertyMap selfMap = getMap();
802 final Property property = selfMap.findProperty(key);
803
804 if (property != null) {
805 return new FindProperty(start, this, property);
806 }
807
808 if (deep) {
809 final ScriptObject myProto = getProto();
810 final FindProperty find = myProto == null ? null : myProto.findProperty(key, true, start);
811 // checkSharedProtoMap must be invoked after myProto.checkSharedProtoMap to propagate
812 // shared proto invalidation up the prototype chain. It also must be invoked when prototype is null.
813 checkSharedProtoMap();
814 return find;
815 }
816
817 return null;
818 }
819
820 /**
821 * Low level property API. This is similar to {@link #findProperty(Object, boolean)} but returns a
822 * {@code boolean} value instead of a {@link FindProperty} object.
823 * @param key Property key.
824 * @param deep Whether the search should look up proto chain.
825 * @return true if the property was found.
826 */
827 boolean hasProperty(final Object key, final boolean deep) {
828 if (getMap().findProperty(key) != null) {
829 return true;
830 }
831
832 if (deep) {
833 final ScriptObject myProto = getProto();
834 if (myProto != null) {
835 return myProto.hasProperty(key, true);
836 }
837 }
838
839 return false;
840 }
841
842 private SwitchPoint findBuiltinSwitchPoint(final Object key) {
843 for (ScriptObject myProto = getProto(); myProto != null; myProto = myProto.getProto()) {
844 final Property prop = myProto.getMap().findProperty(key);
845 if (prop != null) {
846 final SwitchPoint sp = prop.getBuiltinSwitchPoint();
847 if (sp != null && !sp.hasBeenInvalidated()) {
848 return sp;
849 }
850 }
851 }
852 return null;
853 }
854
855 /**
856 * Add a new property to the object.
857 * <p>
858 * This a more "low level" way that doesn't involve {@link PropertyDescriptor}s
859 *
860 * @param key Property key.
861 * @param propertyFlags Property flags.
862 * @param getter Property getter, or null if not defined
863 * @param setter Property setter, or null if not defined
864 *
865 * @return New property.
866 */
867 public final Property addOwnProperty(final Object key, final int propertyFlags, final ScriptFunction getter, final ScriptFunction setter) {
868 return addOwnProperty(newUserAccessors(key, propertyFlags, getter, setter));
869 }
870
871 /**
872 * Add a new property to the object.
873 * <p>
874 * This a more "low level" way that doesn't involve {@link PropertyDescriptor}s
875 *
876 * @param key Property key.
877 * @param propertyFlags Property flags.
878 * @param value Value of property
879 *
880 * @return New property.
881 */
882 public final Property addOwnProperty(final Object key, final int propertyFlags, final Object value) {
883 return addSpillProperty(key, propertyFlags, value, true);
884 }
885
886 /**
887 * Add a new property to the object.
888 * <p>
889 * This a more "low level" way that doesn't involve {@link PropertyDescriptor}s
890 *
891 * @param newProperty property to add
892 *
893 * @return New property.
894 */
895 public final Property addOwnProperty(final Property newProperty) {
896 PropertyMap oldMap = getMap();
897 while (true) {
898 final PropertyMap newMap = oldMap.addProperty(newProperty);
899 if (!compareAndSetMap(oldMap, newMap)) {
900 oldMap = getMap();
901 final Property oldProperty = oldMap.findProperty(newProperty.getKey());
902
903 if (oldProperty != null) {
904 return oldProperty;
905 }
906 } else {
907 return newProperty;
908 }
909 }
910 }
911
912 private void erasePropertyValue(final Property property) {
913 // Erase the property field value with undefined. If the property is defined
914 // by user-defined accessors, we don't want to call the setter!!
915 if (!(property instanceof UserAccessorProperty)) {
916 assert property != null;
917 property.setValue(this, this, UNDEFINED, false);
918 }
919 }
920
921 /**
922 * Delete a property from the object.
923 *
924 * @param property Property to delete.
925 *
926 * @return true if deleted.
927 */
928 public final boolean deleteOwnProperty(final Property property) {
929 erasePropertyValue(property);
930 PropertyMap oldMap = getMap();
931
932 while (true) {
933 final PropertyMap newMap = oldMap.deleteProperty(property);
934
935 if (newMap == null) {
936 return false;
937 }
938
939 if (!compareAndSetMap(oldMap, newMap)) {
940 oldMap = getMap();
941 } else {
942 // delete getter and setter function references so that we don't leak
943 if (property instanceof UserAccessorProperty) {
944 ((UserAccessorProperty)property).setAccessors(this, getMap(), null);
945 }
946
947 invalidateGlobalConstant(property.getKey());
948 return true;
949 }
950 }
951
952 }
953
954 /**
955 * Fast initialization functions for ScriptFunctions that are strict, to avoid
956 * creating setters that probably aren't used. Inject directly into the spill pool
957 * the defaults for "arguments" and "caller"
958 *
959 * @param key property key
960 * @param propertyFlags flags
961 * @param getter getter for {@link UserAccessorProperty}, null if not present or N/A
962 * @param setter setter for {@link UserAccessorProperty}, null if not present or N/A
963 */
964 protected final void initUserAccessors(final String key, final int propertyFlags, final ScriptFunction getter, final ScriptFunction setter) {
965 final PropertyMap oldMap = getMap();
966 final int slot = oldMap.getFreeSpillSlot();
967 ensureSpillSize(slot);
968 objectSpill[slot] = new UserAccessorProperty.Accessors(getter, setter);
969 Property newProperty;
970 PropertyMap newMap;
971 do {
972 newProperty = new UserAccessorProperty(key, propertyFlags, slot);
973 newMap = oldMap.addProperty(newProperty);
974 } while (!compareAndSetMap(oldMap, newMap));
975 }
976
977 /**
978 * Modify a property in the object
979 *
980 * @param oldProperty property to modify
981 * @param propertyFlags new property flags
982 * @param getter getter for {@link UserAccessorProperty}, null if not present or N/A
983 * @param setter setter for {@link UserAccessorProperty}, null if not present or N/A
984 *
985 * @return new property
986 */
987 public final Property modifyOwnProperty(final Property oldProperty, final int propertyFlags, final ScriptFunction getter, final ScriptFunction setter) {
988 Property newProperty;
989
990 if (oldProperty instanceof UserAccessorProperty) {
991 final UserAccessorProperty uc = (UserAccessorProperty)oldProperty;
992 final int slot = uc.getSlot();
993
994 assert uc.getLocalType() == Object.class;
995 final UserAccessorProperty.Accessors gs = uc.getAccessors(this); //this crashes
996 assert gs != null;
997 //reuse existing getter setter for speed
998 gs.set(getter, setter);
999 if (uc.getFlags() == propertyFlags) {
1000 return oldProperty;
1001 }
1002 newProperty = new UserAccessorProperty(uc.getKey(), propertyFlags, slot);
1003 } else {
1004 // erase old property value and create new user accessor property
1005 erasePropertyValue(oldProperty);
1006 newProperty = newUserAccessors(oldProperty.getKey(), propertyFlags, getter, setter);
1007 }
1008
1009 return modifyOwnProperty(oldProperty, newProperty);
1010 }
1011
1012 /**
1013 * Modify a property in the object
1014 *
1015 * @param oldProperty property to modify
1016 * @param propertyFlags new property flags
1017 *
1018 * @return new property
1019 */
1020 public final Property modifyOwnProperty(final Property oldProperty, final int propertyFlags) {
1021 return modifyOwnProperty(oldProperty, oldProperty.setFlags(propertyFlags));
1022 }
1023
1024 /**
1025 * Modify a property in the object, replacing a property with a new one
1026 *
1027 * @param oldProperty property to replace
1028 * @param newProperty property to replace it with
1029 *
1030 * @return new property
1031 */
1032 private Property modifyOwnProperty(final Property oldProperty, final Property newProperty) {
1033 if (oldProperty == newProperty) {
1034 return newProperty; //nop
1035 }
1036
1037 assert newProperty.getKey().equals(oldProperty.getKey()) : "replacing property with different key";
1038
1039 PropertyMap oldMap = getMap();
1040
1041 while (true) {
1042 final PropertyMap newMap = oldMap.replaceProperty(oldProperty, newProperty);
1043
1044 if (!compareAndSetMap(oldMap, newMap)) {
1045 oldMap = getMap();
1046 final Property oldPropertyLookup = oldMap.findProperty(oldProperty.getKey());
1047
1048 if (oldPropertyLookup != null && oldPropertyLookup.equals(newProperty)) {
1049 return oldPropertyLookup;
1050 }
1051 } else {
1052 return newProperty;
1053 }
1054 }
1055 }
1056
1057 /**
1058 * Update getter and setter in an object literal.
1059 *
1060 * @param key Property key.
1061 * @param getter {@link UserAccessorProperty} defined getter, or null if none
1062 * @param setter {@link UserAccessorProperty} defined setter, or null if none
1063 */
1064 public final void setUserAccessors(final String key, final ScriptFunction getter, final ScriptFunction setter) {
1065 final Property oldProperty = getMap().findProperty(key);
1066 if (oldProperty instanceof UserAccessorProperty) {
1067 modifyOwnProperty(oldProperty, oldProperty.getFlags(), getter, setter);
1068 } else {
1069 addOwnProperty(newUserAccessors(key, oldProperty != null ? oldProperty.getFlags() : 0, getter, setter));
1070 }
1071 }
1072
1073 private static int getIntValue(final FindProperty find, final int programPoint) {
1074 final MethodHandle getter = find.getGetter(int.class, programPoint, null);
1075 if (getter != null) {
1076 try {
1077 return (int)getter.invokeExact((Object)find.getGetterReceiver());
1078 } catch (final Error|RuntimeException e) {
1079 throw e;
1080 } catch (final Throwable e) {
1081 throw new RuntimeException(e);
1082 }
1083 }
1084
1085 return UNDEFINED_INT;
1086 }
1087
1088 private static double getDoubleValue(final FindProperty find, final int programPoint) {
1089 final MethodHandle getter = find.getGetter(double.class, programPoint, null);
1090 if (getter != null) {
1091 try {
1092 return (double)getter.invokeExact((Object)find.getGetterReceiver());
1093 } catch (final Error|RuntimeException e) {
1094 throw e;
1095 } catch (final Throwable e) {
1096 throw new RuntimeException(e);
1097 }
1098 }
1099
1100 return UNDEFINED_DOUBLE;
1101 }
1102
1103 /**
1104 * Return methodHandle of value function for call.
1105 *
1106 * @param find data from find property.
1107 * @param type method type of function.
1108 * @param bindName null or name to bind to second argument (property not found method.)
1109 *
1110 * @return value of property as a MethodHandle or null.
1111 */
1112 protected MethodHandle getCallMethodHandle(final FindProperty find, final MethodType type, final String bindName) {
1113 return getCallMethodHandle(find.getObjectValue(), type, bindName);
1114 }
1115
1116 /**
1117 * Return methodHandle of value function for call.
1118 *
1119 * @param value value of receiver, it not a {@link ScriptFunction} this will return null.
1120 * @param type method type of function.
1121 * @param bindName null or name to bind to second argument (property not found method.)
1122 *
1123 * @return value of property as a MethodHandle or null.
1124 */
1125 protected static MethodHandle getCallMethodHandle(final Object value, final MethodType type, final String bindName) {
1126 return value instanceof ScriptFunction ? ((ScriptFunction)value).getCallMethodHandle(type, bindName) : null;
1127 }
1128
1129 /**
1130 * Get value using found property.
1131 *
1132 * @param property Found property.
1133 *
1134 * @return Value of property.
1135 */
1136 public final Object getWithProperty(final Property property) {
1137 return new FindProperty(this, this, property).getObjectValue();
1138 }
1139
1140 /**
1141 * Get a property given a key
1142 *
1143 * @param key property key
1144 *
1145 * @return property for key
1146 */
1147 public final Property getProperty(final String key) {
1148 return getMap().findProperty(key);
1149 }
1150
1151 /**
1152 * Overridden by {@link jdk.nashorn.internal.objects.NativeArguments} class (internal use.)
1153 * Used for argument access in a vararg function using parameter name.
1154 * Returns the argument at a given key (index)
1155 *
1156 * @param key argument index
1157 *
1158 * @return the argument at the given position, or undefined if not present
1159 */
1160 public Object getArgument(final int key) {
1161 return get(key);
1162 }
1163
1164 /**
1165 * Overridden by {@link jdk.nashorn.internal.objects.NativeArguments} class (internal use.)
1166 * Used for argument access in a vararg function using parameter name.
1167 * Returns the argument at a given key (index)
1168 *
1169 * @param key argument index
1170 * @param value the value to write at the given index
1171 */
1172 public void setArgument(final int key, final Object value) {
1173 set(key, value, 0);
1174 }
1175
1176 /**
1177 * Return the current context from the object's map.
1178 * @return Current context.
1179 */
1180 protected Context getContext() {
1181 return Context.fromClass(getClass());
1182 }
1183
1184 /**
1185 * Return the map of an object.
1186 * @return PropertyMap object.
1187 */
1188 public final PropertyMap getMap() {
1189 return map;
1190 }
1191
1192 /**
1193 * Set the initial map.
1194 * @param map Initial map.
1195 */
1196 public final void setMap(final PropertyMap map) {
1197 this.map = map;
1198 }
1199
1200 /**
1201 * Conditionally set the new map if the old map is the same.
1202 * @param oldMap Map prior to manipulation.
1203 * @param newMap Replacement map.
1204 * @return true if the operation succeeded.
1205 */
1206 protected final boolean compareAndSetMap(final PropertyMap oldMap, final PropertyMap newMap) {
1207 if (oldMap == this.map) {
1208 this.map = newMap;
1209 return true;
1210 }
1211 return false;
1212 }
1213
1214 /**
1215 * Return the __proto__ of an object.
1216 * @return __proto__ object.
1217 */
1218 public final ScriptObject getProto() {
1219 return proto;
1220 }
1221
1222 /**
1223 * Get the proto of a specific depth
1224 * @param n depth
1225 * @return proto at given depth
1226 */
1227 public final ScriptObject getProto(final int n) {
1228 assert n > 0;
1229 ScriptObject p = getProto();
1230 for (int i = n; --i > 0;) {
1231 p = p.getProto();
1232 }
1233 return p;
1234 }
1235
1236 /**
1237 * Set the __proto__ of an object.
1238 * @param newProto new __proto__ to set.
1239 */
1240 public final void setProto(final ScriptObject newProto) {
1241 final ScriptObject oldProto = proto;
1242
1243 if (oldProto != newProto) {
1244 proto = newProto;
1245
1246 // Let current listeners know that the prototype has changed
1247 getMap().protoChanged(true);
1248 // Replace our current allocator map with one that is associated with the new prototype.
1249 setMap(getMap().changeProto(newProto));
1250 }
1251 }
1252
1253 /**
1254 * Set the initial __proto__ of this object. This should be used instead of
1255 * {@link #setProto} if it is known that the current property map will not be
1256 * used on a new object with any other parent property map, so we can pass over
1257 * property map invalidation/evolution.
1258 *
1259 * @param initialProto the initial __proto__ to set.
1260 */
1261 public void setInitialProto(final ScriptObject initialProto) {
1262 this.proto = initialProto;
1263 }
1264
1265 /**
1266 * Invoked from generated bytecode to initialize the prototype of object literals to the global Object prototype.
1267 * @param obj the object literal that needs to have its prototype initialized to the global Object prototype.
1268 */
1269 public static void setGlobalObjectProto(final ScriptObject obj) {
1270 obj.setInitialProto(Global.objectPrototype());
1271 }
1272
1273 /**
1274 * Set the __proto__ of an object with checks.
1275 * This is the built-in operation [[SetPrototypeOf]]
1276 * See ES6 draft spec: 9.1.2 [[SetPrototypeOf]] (V)
1277 *
1278 * @param newProto Prototype to set.
1279 */
1280 public final void setPrototypeOf(final Object newProto) {
1281 if (newProto == null || newProto instanceof ScriptObject) {
1282 if (! isExtensible()) {
1283 // okay to set same proto again - even if non-extensible
1284
1285 if (newProto == getProto()) {
1286 return;
1287 }
1288 throw typeError("__proto__.set.non.extensible", ScriptRuntime.safeToString(this));
1289 }
1290
1291 // check for circularity
1292 ScriptObject p = (ScriptObject)newProto;
1293 while (p != null) {
1294 if (p == this) {
1295 throw typeError("circular.__proto__.set", ScriptRuntime.safeToString(this));
1296 }
1297 p = p.getProto();
1298 }
1299 setProto((ScriptObject) newProto);
1300 } else {
1301 throw typeError("cant.set.proto.to.non.object", ScriptRuntime.safeToString(this), ScriptRuntime.safeToString(newProto));
1302 }
1303 }
1304
1305 /**
1306 * Set the __proto__ of an object from an object literal.
1307 * See ES6 draft spec: B.3.1 __proto__ Property Names in
1308 * Object Initializers. Step 6 handling of "__proto__".
1309 *
1310 * @param newProto Prototype to set.
1311 */
1312 public final void setProtoFromLiteral(final Object newProto) {
1313 if (newProto == null || newProto instanceof ScriptObject) {
1314 setPrototypeOf(newProto);
1315 } else {
1316 // Some non-object, non-null. Then, we need to set
1317 // Object.prototype as the new __proto__
1318 //
1319 // var obj = { __proto__ : 34 };
1320 // print(obj.__proto__ === Object.prototype); // => true
1321 setPrototypeOf(Global.objectPrototype());
1322 }
1323 }
1324
1325 /**
1326 * return an array of all property keys - all inherited, non-enumerable included.
1327 * This is meant for source code completion by interactive shells or editors.
1328 *
1329 * @return Array of keys, order of properties is undefined.
1330 */
1331 public String[] getAllKeys() {
1332 final Set<String> keys = new HashSet<>();
1333 final Set<String> nonEnumerable = new HashSet<>();
1334 for (ScriptObject self = this; self != null; self = self.getProto()) {
1335 keys.addAll(Arrays.asList(self.getOwnKeys(String.class, true, nonEnumerable)));
1336 }
1337 return keys.toArray(new String[keys.size()]);
1338 }
1339
1340 /**
1341 * Return an array of own property keys associated with the object.
1342 *
1343 * @param all True if to include non-enumerable keys.
1344 * @return Array of keys.
1345 */
1346 public final String[] getOwnKeys(final boolean all) {
1347 return getOwnKeys(String.class, all, null);
1348 }
1349
1350 /**
1351 * Return an array of own property keys associated with the object.
1352 *
1353 * @param all True if to include non-enumerable keys.
1354 * @return Array of keys.
1355 */
1356 public final Symbol[] getOwnSymbols(final boolean all) {
1357 return getOwnKeys(Symbol.class, all, null);
1358 }
1359
1360 /**
1361 * return an array of own property keys associated with the object.
1362 *
1363 * @param <T> the type returned keys.
1364 * @param type the type of keys to return, either {@code String.class} or {@code Symbol.class}.
1365 * @param all True if to include non-enumerable keys.
1366 * @param nonEnumerable set of non-enumerable properties seen already. Used to
1367 * filter out shadowed, but enumerable properties from proto children.
1368 * @return Array of keys.
1369 */
1370 @SuppressWarnings("unchecked")
1371 protected <T> T[] getOwnKeys(final Class<T> type, final boolean all, final Set<T> nonEnumerable) {
1372 final List<Object> keys = new ArrayList<>();
1373 final PropertyMap selfMap = this.getMap();
1374
1375 final ArrayData array = getArray();
1376
1377 if (type == String.class) {
1378 for (final Iterator<Long> iter = array.indexIterator(); iter.hasNext(); ) {
1379 keys.add(JSType.toString(iter.next().longValue()));
1380 }
1381 }
1382
1383 for (final Property property : selfMap.getProperties()) {
1384 final boolean enumerable = property.isEnumerable();
1385 final Object key = property.getKey();
1386 if (!type.isInstance(key)) {
1387 continue;
1388 }
1389 if (all) {
1390 keys.add(key);
1391 } else if (enumerable) {
1392 // either we don't have non-enumerable filter set or filter set
1393 // does not contain the current property.
1394 if (nonEnumerable == null || !nonEnumerable.contains(key)) {
1395 keys.add(key);
1396 }
1397 } else {
1398 // store this non-enumerable property for later proto walk
1399 if (nonEnumerable != null) {
1400 nonEnumerable.add((T) key);
1401 }
1402 }
1403 }
1404
1405 return keys.toArray((T[]) Array.newInstance(type, keys.size()));
1406 }
1407
1408 /**
1409 * Check if this ScriptObject has array entries. This means that someone has
1410 * set values with numeric keys in the object.
1411 *
1412 * @return true if array entries exists.
1413 */
1414 public boolean hasArrayEntries() {
1415 return getArray().length() > 0 || getMap().containsArrayKeys();
1416 }
1417
1418 /**
1419 * Return the valid JavaScript type name descriptor
1420 *
1421 * @return "Object"
1422 */
1423 public String getClassName() {
1424 return "Object";
1425 }
1426
1427 /**
1428 * {@code length} is a well known property. This is its getter.
1429 * Note that this *may* be optimized by other classes
1430 *
1431 * @return length property value for this ScriptObject
1432 */
1433 public Object getLength() {
1434 return get("length");
1435 }
1436
1437 /**
1438 * Stateless toString for ScriptObjects.
1439 *
1440 * @return string description of this object, e.g. {@code [object Object]}
1441 */
1442 public String safeToString() {
1443 return "[object " + getClassName() + "]";
1444 }
1445
1446 /**
1447 * Return the default value of the object with a given preferred type hint.
1448 * The preferred type hints are String.class for type String, Number.class
1449 * for type Number. <p>
1450 *
1451 * A <code>hint</code> of null means "no hint".
1452 *
1453 * ECMA 8.12.8 [[DefaultValue]](hint)
1454 *
1455 * @param typeHint the preferred type hint
1456 * @return the default value
1457 */
1458 public Object getDefaultValue(final Class<?> typeHint) {
1459 // We delegate to Global, as the implementation uses dynamic call sites to invoke object's "toString" and
1460 // "valueOf" methods, and in order to avoid those call sites from becoming megamorphic when multiple contexts
1461 // are being executed in a long-running program, we move the code and their associated dynamic call sites
1462 // (Global.TO_STRING and Global.VALUE_OF) into per-context code.
1463 return Context.getGlobal().getDefaultValue(this, typeHint);
1464 }
1465
1466 /**
1467 * Checking whether a script object is an instance of another. Used
1468 * in {@link ScriptFunction} for hasInstance implementation, walks
1469 * the proto chain
1470 *
1471 * @param instance instance to check
1472 * @return true if 'instance' is an instance of this object
1473 */
1474 public boolean isInstance(final ScriptObject instance) {
1475 return false;
1476 }
1477
1478 /**
1479 * Flag this ScriptObject as non extensible
1480 *
1481 * @return the object after being made non extensible
1482 */
1483 public ScriptObject preventExtensions() {
1484 PropertyMap oldMap = getMap();
1485 while (!compareAndSetMap(oldMap, getMap().preventExtensions())) {
1486 oldMap = getMap();
1487 }
1488
1489 //invalidate any fast array setters
1490 final ArrayData array = getArray();
1491 assert array != null;
1492 setArray(ArrayData.preventExtension(array));
1493 return this;
1494 }
1495
1496 /**
1497 * Check whether if an Object (not just a ScriptObject) represents JavaScript array
1498 *
1499 * @param obj object to check
1500 *
1501 * @return true if array
1502 */
1503 public static boolean isArray(final Object obj) {
1504 return obj instanceof ScriptObject && ((ScriptObject)obj).isArray();
1505 }
1506
1507 /**
1508 * Check if this ScriptObject is an array
1509 * @return true if array
1510 */
1511 public final boolean isArray() {
1512 return (flags & IS_ARRAY) != 0;
1513 }
1514
1515 /**
1516 * Flag this ScriptObject as being an array
1517 */
1518 public final void setIsArray() {
1519 flags |= IS_ARRAY;
1520 }
1521
1522 /**
1523 * Check if this ScriptObject is an {@code arguments} vector
1524 * @return true if arguments vector
1525 */
1526 public final boolean isArguments() {
1527 return (flags & IS_ARGUMENTS) != 0;
1528 }
1529
1530 /**
1531 * Flag this ScriptObject as being an {@code arguments} vector
1532 */
1533 public final void setIsArguments() {
1534 flags |= IS_ARGUMENTS;
1535 }
1536
1537 /**
1538 * Check if this object has non-writable length property
1539 *
1540 * @return {@code true} if 'length' property is non-writable
1541 */
1542 public boolean isLengthNotWritable() {
1543 return (flags & IS_LENGTH_NOT_WRITABLE) != 0;
1544 }
1545
1546 /**
1547 * Flag this object as having non-writable length property.
1548 */
1549 public void setIsLengthNotWritable() {
1550 flags |= IS_LENGTH_NOT_WRITABLE;
1551 }
1552
1553 /**
1554 * Get the {@link ArrayData}, for this ScriptObject, ensuring it is of a type
1555 * that can handle elementType
1556 * @param elementType elementType
1557 * @return array data
1558 */
1559 public final ArrayData getArray(final Class<?> elementType) {
1560 if (elementType == null) {
1561 return arrayData;
1562 }
1563 final ArrayData newArrayData = arrayData.convert(elementType);
1564 if (newArrayData != arrayData) {
1565 arrayData = newArrayData;
1566 }
1567 return newArrayData;
1568 }
1569
1570 /**
1571 * Get the {@link ArrayData} for this ScriptObject if it is an array
1572 * @return array data
1573 */
1574 public final ArrayData getArray() {
1575 return arrayData;
1576 }
1577
1578 /**
1579 * Set the {@link ArrayData} for this ScriptObject if it is to be an array
1580 * @param arrayData the array data
1581 */
1582 public final void setArray(final ArrayData arrayData) {
1583 this.arrayData = arrayData;
1584 }
1585
1586 /**
1587 * Check if this ScriptObject is extensible
1588 * @return true if extensible
1589 */
1590 public boolean isExtensible() {
1591 return getMap().isExtensible();
1592 }
1593
1594 /**
1595 * ECMAScript 15.2.3.8 - seal implementation
1596 * @return the sealed ScriptObject
1597 */
1598 public ScriptObject seal() {
1599 PropertyMap oldMap = getMap();
1600
1601 while (true) {
1602 final PropertyMap newMap = getMap().seal();
1603
1604 if (!compareAndSetMap(oldMap, newMap)) {
1605 oldMap = getMap();
1606 } else {
1607 setArray(ArrayData.seal(getArray()));
1608 return this;
1609 }
1610 }
1611 }
1612
1613 /**
1614 * Check whether this ScriptObject is sealed
1615 * @return true if sealed
1616 */
1617 public boolean isSealed() {
1618 return getMap().isSealed();
1619 }
1620
1621 /**
1622 * ECMA 15.2.39 - freeze implementation. Freeze this ScriptObject
1623 * @return the frozen ScriptObject
1624 */
1625 public ScriptObject freeze() {
1626 PropertyMap oldMap = getMap();
1627
1628 while (true) {
1629 final PropertyMap newMap = getMap().freeze();
1630
1631 if (!compareAndSetMap(oldMap, newMap)) {
1632 oldMap = getMap();
1633 } else {
1634 setArray(ArrayData.freeze(getArray()));
1635 return this;
1636 }
1637 }
1638 }
1639
1640 /**
1641 * Check whether this ScriptObject is frozen
1642 * @return true if frozen
1643 */
1644 public boolean isFrozen() {
1645 return getMap().isFrozen();
1646 }
1647
1648 /**
1649 * Check whether this ScriptObject is scope
1650 * @return true if scope
1651 */
1652 public boolean isScope() {
1653 return false;
1654 }
1655
1656 /**
1657 * Tag this script object as built in
1658 */
1659 public final void setIsBuiltin() {
1660 flags |= IS_BUILTIN;
1661 }
1662
1663 /**
1664 * Check if this script object is built in
1665 * @return true if build in
1666 */
1667 public final boolean isBuiltin() {
1668 return (flags & IS_BUILTIN) != 0;
1669 }
1670
1671 /**
1672 * Clears the properties from a ScriptObject
1673 * (java.util.Map-like method to help ScriptObjectMirror implementation)
1674 *
1675 * @param strict strict mode or not
1676 */
1677 public void clear(final boolean strict) {
1678 final Iterator<String> iter = propertyIterator();
1679 while (iter.hasNext()) {
1680 delete(iter.next(), strict);
1681 }
1682 }
1683
1684 /**
1685 * Checks if a property with a given key is present in a ScriptObject
1686 * (java.util.Map-like method to help ScriptObjectMirror implementation)
1687 *
1688 * @param key the key to check for
1689 * @return true if a property with the given key exists, false otherwise
1690 */
1691 public boolean containsKey(final Object key) {
1692 return has(key);
1693 }
1694
1695 /**
1696 * Checks if a property with a given value is present in a ScriptObject
1697 * (java.util.Map-like method to help ScriptObjectMirror implementation)
1698 *
1699 * @param value value to check for
1700 * @return true if a property with the given value exists, false otherwise
1701 */
1702 public boolean containsValue(final Object value) {
1703 final Iterator<Object> iter = valueIterator();
1704 while (iter.hasNext()) {
1705 if (iter.next().equals(value)) {
1706 return true;
1707 }
1708 }
1709 return false;
1710 }
1711
1712 /**
1713 * Returns the set of {@literal <property, value>} entries that make up this
1714 * ScriptObject's properties
1715 * (java.util.Map-like method to help ScriptObjectMirror implementation)
1716 *
1717 * @return an entry set of all the properties in this object
1718 */
1719 public Set<Map.Entry<Object, Object>> entrySet() {
1720 final Iterator<String> iter = propertyIterator();
1721 final Set<Map.Entry<Object, Object>> entries = new HashSet<>();
1722 while (iter.hasNext()) {
1723 final Object key = iter.next();
1724 entries.add(new AbstractMap.SimpleImmutableEntry<>(key, get(key)));
1725 }
1726 return Collections.unmodifiableSet(entries);
1727 }
1728
1729 /**
1730 * Check whether a ScriptObject contains no properties
1731 * (java.util.Map-like method to help ScriptObjectMirror implementation)
1732 *
1733 * @return true if object has no properties
1734 */
1735 public boolean isEmpty() {
1736 return !propertyIterator().hasNext();
1737 }
1738
1739 /**
1740 * Return the set of keys (property names) for all properties
1741 * in this ScriptObject
1742 * (java.util.Map-like method to help ScriptObjectMirror implementation)
1743 *
1744 * @return keySet of this ScriptObject
1745 */
1746 public Set<Object> keySet() {
1747 final Iterator<String> iter = propertyIterator();
1748 final Set<Object> keySet = new HashSet<>();
1749 while (iter.hasNext()) {
1750 keySet.add(iter.next());
1751 }
1752 return Collections.unmodifiableSet(keySet);
1753 }
1754
1755 /**
1756 * Put a property in the ScriptObject
1757 * (java.util.Map-like method to help ScriptObjectMirror implementation)
1758 *
1759 * @param key property key
1760 * @param value property value
1761 * @param strict strict mode or not
1762 * @return oldValue if property with same key existed already
1763 */
1764 public Object put(final Object key, final Object value, final boolean strict) {
1765 final Object oldValue = get(key);
1766 final int scriptObjectFlags = strict ? NashornCallSiteDescriptor.CALLSITE_STRICT : 0;
1767 set(key, value, scriptObjectFlags);
1768 return oldValue;
1769 }
1770
1771 /**
1772 * Put several properties in the ScriptObject given a mapping
1773 * of their keys to their values
1774 * (java.util.Map-like method to help ScriptObjectMirror implementation)
1775 *
1776 * @param otherMap a {@literal <key,value>} map of properties to add
1777 * @param strict strict mode or not
1778 */
1779 public void putAll(final Map<?, ?> otherMap, final boolean strict) {
1780 final int scriptObjectFlags = strict ? NashornCallSiteDescriptor.CALLSITE_STRICT : 0;
1781 for (final Map.Entry<?, ?> entry : otherMap.entrySet()) {
1782 set(entry.getKey(), entry.getValue(), scriptObjectFlags);
1783 }
1784 }
1785
1786 /**
1787 * Remove a property from the ScriptObject.
1788 * (java.util.Map-like method to help ScriptObjectMirror implementation)
1789 *
1790 * @param key the key of the property
1791 * @param strict strict mode or not
1792 * @return the oldValue of the removed property
1793 */
1794 public Object remove(final Object key, final boolean strict) {
1795 final Object oldValue = get(key);
1796 delete(key, strict);
1797 return oldValue;
1798 }
1799
1800 /**
1801 * Return the size of the ScriptObject - i.e. the number of properties
1802 * it contains
1803 * (java.util.Map-like method to help ScriptObjectMirror implementation)
1804 *
1805 * @return number of properties in ScriptObject
1806 */
1807 public int size() {
1808 int n = 0;
1809 for (final Iterator<String> iter = propertyIterator(); iter.hasNext(); iter.next()) {
1810 n++;
1811 }
1812 return n;
1813 }
1814
1815 /**
1816 * Return the values of the properties in the ScriptObject
1817 * (java.util.Map-like method to help ScriptObjectMirror implementation)
1818 *
1819 * @return collection of values for the properties in this ScriptObject
1820 */
1821 public Collection<Object> values() {
1822 final List<Object> values = new ArrayList<>(size());
1823 final Iterator<Object> iter = valueIterator();
1824 while (iter.hasNext()) {
1825 values.add(iter.next());
1826 }
1827 return Collections.unmodifiableList(values);
1828 }
1829
1830 /**
1831 * Lookup method that, given a CallSiteDescriptor, looks up the target
1832 * MethodHandle and creates a GuardedInvocation
1833 * with the appropriate guard(s).
1834 *
1835 * @param desc call site descriptor
1836 * @param request the link request
1837 *
1838 * @return GuardedInvocation for the callsite
1839 */
1840 public GuardedInvocation lookup(final CallSiteDescriptor desc, final LinkRequest request) {
1841 // NOTE: we support GET_ELEMENT and SET_ELEMENT as JavaScript doesn't distinguish items from properties. Nashorn itself
1842 // emits "GET_PROPERTY|GET_ELEMENT|GET_METHOD:identifier" for "<expr>.<identifier>" and "GET_ELEMENT|GET_PROPERTY|GET_METHOD" for "<expr>[<expr>]", but we are
1843 // more flexible here and dispatch not on operation name (getProp vs. getElem), but rather on whether the
1844 // operation has an associated name or not.
1845 final StandardOperation op = NashornCallSiteDescriptor.getFirstStandardOperation(desc);
1846 if (op == null) {
1847 return null;
1848 }
1849 switch (op) {
1850 case GET_PROPERTY:
1851 case GET_ELEMENT:
1852 case GET_METHOD:
1853 return desc.getOperation() instanceof NamedOperation
1854 ? findGetMethod(desc, request, op)
1855 : findGetIndexMethod(desc, request);
1856 case SET_PROPERTY:
1857 case SET_ELEMENT:
1858 return desc.getOperation() instanceof NamedOperation
1859 ? findSetMethod(desc, request)
1860 : findSetIndexMethod(desc, request);
1861 case CALL:
1862 return findCallMethod(desc, request);
1863 case NEW:
1864 return findNewMethod(desc, request);
1865 case CALL_METHOD:
1866 return findCallMethodMethod(desc, request);
1867 default:
1868 }
1869 return null;
1870 }
1871
1872 /**
1873 * Find the appropriate New method for an invoke dynamic call.
1874 *
1875 * @param desc The invoke dynamic call site descriptor.
1876 * @param request The link request
1877 *
1878 * @return GuardedInvocation to be invoked at call site.
1879 */
1880 protected GuardedInvocation findNewMethod(final CallSiteDescriptor desc, final LinkRequest request) {
1881 return notAFunction(desc);
1882 }
1883
1884 /**
1885 * Find the appropriate CALL method for an invoke dynamic call.
1886 * This generates "not a function" always
1887 *
1888 * @param desc the call site descriptor.
1889 * @param request the link request
1890 *
1891 * @return GuardedInvocation to be invoked at call site.
1892 */
1893 protected GuardedInvocation findCallMethod(final CallSiteDescriptor desc, final LinkRequest request) {
1894 return notAFunction(desc);
1895 }
1896
1897 private GuardedInvocation notAFunction(final CallSiteDescriptor desc) {
1898 throw typeError("not.a.function", NashornCallSiteDescriptor.getFunctionErrorMessage(desc, this));
1899 }
1900
1901 /**
1902 * Find an implementation for a CALL_METHOD operation. Note that Nashorn internally never uses
1903 * CALL_METHOD, but instead always emits two call sites in bytecode, one for GET_METHOD, and then another
1904 * one for CALL. Explicit support for CALL_METHOD is provided for the benefit of potential external
1905 * callers. The implementation itself actually folds a GET_METHOD method handle into a CALL method handle.
1906 *
1907 * @param desc the call site descriptor.
1908 * @param request the link request
1909 *
1910 * @return GuardedInvocation to be invoked at call site.
1911 */
1912 protected GuardedInvocation findCallMethodMethod(final CallSiteDescriptor desc, final LinkRequest request) {
1913 // R(P0, P1, ...)
1914 final MethodType callType = desc.getMethodType();
1915 // use type Object(P0) for the getter
1916 final CallSiteDescriptor getterType = desc.changeMethodType(MethodType.methodType(Object.class, callType.parameterType(0)));
1917 final GuardedInvocation getter = findGetMethod(getterType, request, StandardOperation.GET_METHOD);
1918
1919 // Object(P0) => Object(P0, P1, ...)
1920 final MethodHandle argDroppingGetter = MH.dropArguments(getter.getInvocation(), 1, callType.parameterList().subList(1, callType.parameterCount()));
1921 // R(Object, P0, P1, ...)
1922 final MethodHandle invoker = Bootstrap.createDynamicInvoker("", NashornCallSiteDescriptor.CALL, callType.insertParameterTypes(0, argDroppingGetter.type().returnType()));
1923 // Fold Object(P0, P1, ...) into R(Object, P0, P1, ...) => R(P0, P1, ...)
1924 return getter.replaceMethods(MH.foldArguments(invoker, argDroppingGetter), getter.getGuard());
1925 }
1926
1927 /**
1928 * Test whether this object contains in its prototype chain or is itself a with-object.
1929 * @return true if a with-object was found
1930 */
1931 boolean hasWithScope() {
1932 return false;
1933 }
1934
1935 /**
1936 * Add a filter to the first argument of {@code methodHandle} that calls its {@link #getProto()} method
1937 * {@code depth} times.
1938 * @param methodHandle a method handle
1939 * @param depth distance to target prototype
1940 * @return the filtered method handle
1941 */
1942 static MethodHandle addProtoFilter(final MethodHandle methodHandle, final int depth) {
1943 if (depth == 0) {
1944 return methodHandle;
1945 }
1946 final int listIndex = depth - 1; // We don't need 0-deep walker
1947 MethodHandle filter = listIndex < PROTO_FILTERS.size() ? PROTO_FILTERS.get(listIndex) : null;
1948
1949 if (filter == null) {
1950 filter = addProtoFilter(GETPROTO, depth - 1);
1951 PROTO_FILTERS.add(null);
1952 PROTO_FILTERS.set(listIndex, filter);
1953 }
1954
1955 return MH.filterArguments(methodHandle, 0, filter.asType(filter.type().changeReturnType(methodHandle.type().parameterType(0))));
1956 }
1957
1958 /**
1959 * Find the appropriate GET method for an invoke dynamic call.
1960 *
1961 * @param desc the call site descriptor
1962 * @param request the link request
1963 * @param operation operation for get: getProp, getMethod, getElem etc
1964 *
1965 * @return GuardedInvocation to be invoked at call site.
1966 */
1967 protected GuardedInvocation findGetMethod(final CallSiteDescriptor desc, final LinkRequest request, final StandardOperation operation) {
1968 final boolean explicitInstanceOfCheck = explicitInstanceOfCheck(desc, request);
1969
1970 String name = NashornCallSiteDescriptor.getOperand(desc);
1971 if (NashornCallSiteDescriptor.isApplyToCall(desc)) {
1972 if (Global.isBuiltinFunctionPrototypeApply()) {
1973 name = "call";
1974 }
1975 }
1976
1977 if (request.isCallSiteUnstable() || hasWithScope()) {
1978 return findMegaMorphicGetMethod(desc, name, operation == StandardOperation.GET_METHOD);
1979 }
1980
1981 final FindProperty find = findProperty(name, true);
1982 MethodHandle mh;
1983
1984 if (find == null) {
1985 switch (operation) {
1986 case GET_ELEMENT: // getElem only gets here if element name is constant, so treat it like a property access
1987 case GET_PROPERTY:
1988 return noSuchProperty(desc, request);
1989 case GET_METHOD:
1990 return noSuchMethod(desc, request);
1991 default:
1992 throw new AssertionError(operation); // never invoked with any other operation
1993 }
1994 }
1995
1996 final GlobalConstants globalConstants = getGlobalConstants();
1997 if (globalConstants != null) {
1998 final GuardedInvocation cinv = globalConstants.findGetMethod(find, this, desc);
1999 if (cinv != null) {
2000 return cinv;
2001 }
2002 }
2003
2004 final Class<?> returnType = desc.getMethodType().returnType();
2005 final Property property = find.getProperty();
2006
2007 final int programPoint = NashornCallSiteDescriptor.isOptimistic(desc) ?
2008 NashornCallSiteDescriptor.getProgramPoint(desc) :
2009 UnwarrantedOptimismException.INVALID_PROGRAM_POINT;
2010
2011 mh = find.getGetter(returnType, programPoint, request);
2012 // Get the appropriate guard for this callsite and property.
2013 final MethodHandle guard = NashornGuards.getGuard(this, property, desc, explicitInstanceOfCheck);
2014 final ScriptObject owner = find.getOwner();
2015 final Class<ClassCastException> exception = explicitInstanceOfCheck ? null : ClassCastException.class;
2016
2017 final SwitchPoint[] protoSwitchPoints;
2018
2019 if (mh == null) {
2020 mh = Lookup.emptyGetter(returnType);
2021 protoSwitchPoints = getProtoSwitchPoints(name, owner);
2022 } else if (!find.isSelf()) {
2023 assert mh.type().returnType().equals(returnType) :
2024 "return type mismatch for getter " + mh.type().returnType() + " != " + returnType;
2025 if (!(property instanceof UserAccessorProperty)) {
2026 // Add a filter that replaces the self object with the prototype owning the property.
2027 mh = addProtoFilter(mh, find.getProtoChainLength());
2028 }
2029 protoSwitchPoints = getProtoSwitchPoints(name, owner);
2030 } else {
2031 protoSwitchPoints = null;
2032 }
2033
2034 final GuardedInvocation inv = new GuardedInvocation(mh, guard, protoSwitchPoints, exception);
2035 return inv.addSwitchPoint(findBuiltinSwitchPoint(name));
2036 }
2037
2038 private static GuardedInvocation findMegaMorphicGetMethod(final CallSiteDescriptor desc, final String name, final boolean isMethod) {
2039 Context.getContextTrusted().getLogger(ObjectClassGenerator.class).warning("Megamorphic getter: " + desc + " " + name + " " +isMethod);
2040 final MethodHandle invoker = MH.insertArguments(MEGAMORPHIC_GET, 1, name, isMethod, NashornCallSiteDescriptor.isScope(desc));
2041 final MethodHandle guard = getScriptObjectGuard(desc.getMethodType(), true);
2042 return new GuardedInvocation(invoker, guard);
2043 }
2044
2045 @SuppressWarnings("unused")
2046 private Object megamorphicGet(final String key, final boolean isMethod, final boolean isScope) {
2047 final FindProperty find = findProperty(key, true);
2048 if (find != null) {
2049 return find.getObjectValue();
2050 }
2051
2052 return isMethod ? getNoSuchMethod(key, isScope, INVALID_PROGRAM_POINT) : invokeNoSuchProperty(key, isScope, INVALID_PROGRAM_POINT);
2053 }
2054
2055 // Marks a property as declared and sets its value. Used as slow path for block-scoped LET and CONST
2056 @SuppressWarnings("unused")
2057 private void declareAndSet(final String key, final Object value) {
2058 final PropertyMap oldMap = getMap();
2059 final FindProperty find = findProperty(key, false);
2060 assert find != null;
2061
2062 final Property property = find.getProperty();
2063 assert property != null;
2064 assert property.needsDeclaration();
2065
2066 final PropertyMap newMap = oldMap.replaceProperty(property, property.removeFlags(Property.NEEDS_DECLARATION));
2067 setMap(newMap);
2068 set(key, value, 0);
2069 }
2070
2071 /**
2072 * Find the appropriate GETINDEX method for an invoke dynamic call.
2073 *
2074 * @param desc the call site descriptor
2075 * @param request the link request
2076 *
2077 * @return GuardedInvocation to be invoked at call site.
2078 */
2079 protected GuardedInvocation findGetIndexMethod(final CallSiteDescriptor desc, final LinkRequest request) {
2080 final MethodType callType = desc.getMethodType();
2081 final Class<?> returnType = callType.returnType();
2082 final Class<?> returnClass = returnType.isPrimitive() ? returnType : Object.class;
2083 final Class<?> keyClass = callType.parameterType(1);
2084 final boolean explicitInstanceOfCheck = explicitInstanceOfCheck(desc, request);
2085
2086 final String name;
2087 if (returnClass.isPrimitive()) {
2088 //turn e.g. get with a double into getDouble
2089 final String returnTypeName = returnClass.getName();
2090 name = "get" + Character.toUpperCase(returnTypeName.charAt(0)) + returnTypeName.substring(1, returnTypeName.length());
2091 } else {
2092 name = "get";
2093 }
2094
2095 final MethodHandle mh = findGetIndexMethodHandle(returnClass, name, keyClass, desc);
2096 return new GuardedInvocation(mh, getScriptObjectGuard(callType, explicitInstanceOfCheck), (SwitchPoint)null, explicitInstanceOfCheck ? null : ClassCastException.class);
2097 }
2098
2099 private static MethodHandle getScriptObjectGuard(final MethodType type, final boolean explicitInstanceOfCheck) {
2100 return ScriptObject.class.isAssignableFrom(type.parameterType(0)) ? null : NashornGuards.getScriptObjectGuard(explicitInstanceOfCheck);
2101 }
2102
2103 /**
2104 * Find a handle for a getIndex method
2105 * @param returnType return type for getter
2106 * @param name name
2107 * @param elementType index type for getter
2108 * @param desc call site descriptor
2109 * @return method handle for getter
2110 */
2111 protected MethodHandle findGetIndexMethodHandle(final Class<?> returnType, final String name, final Class<?> elementType, final CallSiteDescriptor desc) {
2112 if (!returnType.isPrimitive()) {
2113 return findOwnMH_V(getClass(), name, returnType, elementType);
2114 }
2115
2116 return MH.insertArguments(
2117 findOwnMH_V(getClass(), name, returnType, elementType, int.class),
2118 2,
2119 NashornCallSiteDescriptor.isOptimistic(desc) ?
2120 NashornCallSiteDescriptor.getProgramPoint(desc) :
2121 INVALID_PROGRAM_POINT);
2122 }
2123
2124 /**
2125 * Get a switch point for a property with the given {@code name} that will be invalidated when
2126 * the property definition is changed in this object's prototype chain. Returns {@code null} if
2127 * the property is defined in this object itself.
2128 *
2129 * @param name the property name
2130 * @param owner the property owner, null if property is not defined
2131 * @return a SwitchPoint or null
2132 */
2133 public final SwitchPoint[] getProtoSwitchPoints(final String name, final ScriptObject owner) {
2134 if (owner == this || getProto() == null) {
2135 return null;
2136 }
2137
2138 final List<SwitchPoint> switchPoints = new ArrayList<>();
2139 for (ScriptObject obj = this; obj != owner && obj.getProto() != null; obj = obj.getProto()) {
2140 final ScriptObject parent = obj.getProto();
2141 parent.getMap().addListener(name, obj.getMap());
2142 final SwitchPoint sp = parent.getMap().getSharedProtoSwitchPoint();
2143 if (sp != null && !sp.hasBeenInvalidated()) {
2144 switchPoints.add(sp);
2145 }
2146 }
2147
2148 switchPoints.add(getMap().getSwitchPoint(name));
2149 return switchPoints.toArray(new SwitchPoint[switchPoints.size()]);
2150 }
2151
2152 private void checkSharedProtoMap() {
2153 // Check if our map has an expected shared prototype property map. If it has, make sure that
2154 // the prototype map has not been invalidated, and that it does match the actual map of the prototype.
2155 if (getMap().isInvalidSharedMapFor(getProto())) {
2156 // Change our own map to one that does not assume a shared prototype map.
2157 setMap(getMap().makeUnsharedCopy());
2158 }
2159 }
2160
2161 /**
2162 * Find the appropriate SET method for an invoke dynamic call.
2163 *
2164 * @param desc the call site descriptor
2165 * @param request the link request
2166 *
2167 * @return GuardedInvocation to be invoked at call site.
2168 */
2169 protected GuardedInvocation findSetMethod(final CallSiteDescriptor desc, final LinkRequest request) {
2170 final String name = NashornCallSiteDescriptor.getOperand(desc);
2171
2172 if (request.isCallSiteUnstable() || hasWithScope()) {
2173 return findMegaMorphicSetMethod(desc, name);
2174 }
2175
2176 final boolean explicitInstanceOfCheck = explicitInstanceOfCheck(desc, request);
2177
2178 /*
2179 * If doing property set on a scope object, we should stop proto search on the first
2180 * non-scope object. Without this, for example, when assigning "toString" on global scope,
2181 * we'll end up assigning it on it's proto - which is Object.prototype.toString !!
2182 *
2183 * toString = function() { print("global toString"); } // don't affect Object.prototype.toString
2184 */
2185 FindProperty find = findProperty(name, true, this);
2186
2187 // If it's not a scope search, then we don't want any inherited properties except those with user defined accessors.
2188 if (find != null && find.isInherited() && !(find.getProperty() instanceof UserAccessorProperty)) {
2189 // We should still check if inherited data property is not writable
2190 if (isExtensible() && !find.getProperty().isWritable()) {
2191 return createEmptySetMethod(desc, explicitInstanceOfCheck, "property.not.writable", true);
2192 }
2193 // Otherwise, forget the found property unless this is a scope callsite and the owner is a scope object as well.
2194 if (!NashornCallSiteDescriptor.isScope(desc) || !find.getOwner().isScope()) {
2195 find = null;
2196 }
2197 }
2198
2199 if (find != null) {
2200 if (!find.getProperty().isWritable() && !NashornCallSiteDescriptor.isDeclaration(desc)) {
2201 if (NashornCallSiteDescriptor.isScope(desc) && find.getProperty().isLexicalBinding()) {
2202 throw typeError("assign.constant", name); // Overwriting ES6 const should throw also in non-strict mode.
2203 }
2204 // Existing, non-writable property
2205 return createEmptySetMethod(desc, explicitInstanceOfCheck, "property.not.writable", true);
2206 }
2207 } else {
2208 if (!isExtensible()) {
2209 return createEmptySetMethod(desc, explicitInstanceOfCheck, "object.non.extensible", false);
2210 }
2211 }
2212
2213 final GuardedInvocation inv = new SetMethodCreator(this, find, desc, request).createGuardedInvocation(findBuiltinSwitchPoint(name));
2214
2215 final GlobalConstants globalConstants = getGlobalConstants();
2216 if (globalConstants != null) {
2217 final GuardedInvocation cinv = globalConstants.findSetMethod(find, this, inv, desc, request);
2218 if (cinv != null) {
2219 return cinv;
2220 }
2221 }
2222
2223 return inv;
2224 }
2225
2226 private GlobalConstants getGlobalConstants() {
2227 // Avoid hitting getContext() which might be costly for a non-Global unless needed.
2228 return GlobalConstants.GLOBAL_ONLY && !isGlobal() ? null : getContext().getGlobalConstants();
2229 }
2230
2231 private GuardedInvocation createEmptySetMethod(final CallSiteDescriptor desc, final boolean explicitInstanceOfCheck, final String strictErrorMessage, final boolean canBeFastScope) {
2232 final String name = NashornCallSiteDescriptor.getOperand(desc);
2233 if (NashornCallSiteDescriptor.isStrict(desc)) {
2234 throw typeError(strictErrorMessage, name, ScriptRuntime.safeToString(this));
2235 }
2236 assert canBeFastScope || !NashornCallSiteDescriptor.isFastScope(desc);
2237 return new GuardedInvocation(
2238 Lookup.EMPTY_SETTER,
2239 NashornGuards.getMapGuard(getMap(), explicitInstanceOfCheck),
2240 getProtoSwitchPoints(name, null),
2241 explicitInstanceOfCheck ? null : ClassCastException.class);
2242 }
2243
2244 @SuppressWarnings("unused")
2245 private boolean extensionCheck(final boolean isStrict, final String name) {
2246 if (isExtensible()) {
2247 return true; //go on and do the set. this is our guard
2248 } else if (isStrict) {
2249 //throw an error for attempting to do the set in strict mode
2250 throw typeError("object.non.extensible", name, ScriptRuntime.safeToString(this));
2251 } else {
2252 //not extensible, non strict - this is a nop
2253 return false;
2254 }
2255 }
2256
2257 private GuardedInvocation findMegaMorphicSetMethod(final CallSiteDescriptor desc, final String name) {
2258 final MethodType type = desc.getMethodType().insertParameterTypes(1, Object.class);
2259 //never bother with ClassCastExceptionGuard for megamorphic callsites
2260 final GuardedInvocation inv = findSetIndexMethod(getClass(), desc, false, type);
2261 return inv.replaceMethods(MH.insertArguments(inv.getInvocation(), 1, name), inv.getGuard());
2262 }
2263
2264 @SuppressWarnings("unused")
2265 private static Object globalFilter(final Object object) {
2266 ScriptObject sobj = (ScriptObject) object;
2267 while (sobj != null && !(sobj instanceof Global)) {
2268 sobj = sobj.getProto();
2269 }
2270 return sobj;
2271 }
2272
2273 /**
2274 * Lookup function for the set index method, available for subclasses as well, e.g. {@link NativeArray}
2275 * provides special quick accessor linkage for continuous arrays that are represented as Java arrays
2276 *
2277 * @param desc call site descriptor
2278 * @param request link request
2279 *
2280 * @return GuardedInvocation to be invoked at call site.
2281 */
2282 protected GuardedInvocation findSetIndexMethod(final CallSiteDescriptor desc, final LinkRequest request) { // array, index, value
2283 return findSetIndexMethod(getClass(), desc, explicitInstanceOfCheck(desc, request), desc.getMethodType());
2284 }
2285
2286 /**
2287 * Find the appropriate SETINDEX method for an invoke dynamic call.
2288 *
2289 * @param clazz the receiver class
2290 * @param desc the call site descriptor
2291 * @param explicitInstanceOfCheck add an explicit instanceof check?
2292 * @param callType the method type at the call site
2293 *
2294 * @return GuardedInvocation to be invoked at call site.
2295 */
2296 private static GuardedInvocation findSetIndexMethod(final Class<? extends ScriptObject> clazz, final CallSiteDescriptor desc, final boolean explicitInstanceOfCheck, final MethodType callType) {
2297 assert callType.parameterCount() == 3;
2298 final Class<?> keyClass = callType.parameterType(1);
2299 final Class<?> valueClass = callType.parameterType(2);
2300
2301 MethodHandle methodHandle = findOwnMH_V(clazz, "set", void.class, keyClass, valueClass, int.class);
2302 methodHandle = MH.insertArguments(methodHandle, 3, NashornCallSiteDescriptor.getFlags(desc));
2303
2304 return new GuardedInvocation(methodHandle, getScriptObjectGuard(callType, explicitInstanceOfCheck), (SwitchPoint)null, explicitInstanceOfCheck ? null : ClassCastException.class);
2305 }
2306
2307 /**
2308 * Fall back if a function property is not found.
2309 * @param desc The call site descriptor
2310 * @param request the link request
2311 * @return GuardedInvocation to be invoked at call site.
2312 */
2313 public GuardedInvocation noSuchMethod(final CallSiteDescriptor desc, final LinkRequest request) {
2314 final String name = NashornCallSiteDescriptor.getOperand(desc);
2315 final FindProperty find = findProperty(NO_SUCH_METHOD_NAME, true);
2316 final boolean scopeCall = isScope() && NashornCallSiteDescriptor.isScope(desc);
2317
2318 if (find == null) {
2319 return noSuchProperty(desc, request);
2320 }
2321
2322 final boolean explicitInstanceOfCheck = explicitInstanceOfCheck(desc, request);
2323
2324 final Object value = find.getObjectValue();
2325 if (!(value instanceof ScriptFunction)) {
2326 return createEmptyGetter(desc, explicitInstanceOfCheck, name);
2327 }
2328
2329 final ScriptFunction func = (ScriptFunction)value;
2330 final Object thiz = scopeCall && func.isStrict() ? UNDEFINED : this;
2331 // TODO: It'd be awesome if we could bind "name" without binding "this".
2332 // Since we're binding this we must use an identity guard here.
2333 return new GuardedInvocation(
2334 MH.dropArguments(
2335 MH.constant(
2336 ScriptFunction.class,
2337 func.createBound(thiz, new Object[] { name })),
2338 0,
2339 Object.class),
2340 NashornGuards.combineGuards(
2341 NashornGuards.getIdentityGuard(this),
2342 NashornGuards.getMapGuard(getMap(), true)));
2343 }
2344
2345 /**
2346 * Fall back if a property is not found.
2347 * @param desc the call site descriptor.
2348 * @param request the link request
2349 * @return GuardedInvocation to be invoked at call site.
2350 */
2351 public GuardedInvocation noSuchProperty(final CallSiteDescriptor desc, final LinkRequest request) {
2352 final String name = NashornCallSiteDescriptor.getOperand(desc);
2353 final FindProperty find = findProperty(NO_SUCH_PROPERTY_NAME, true);
2354 final boolean scopeAccess = isScope() && NashornCallSiteDescriptor.isScope(desc);
2355
2356 if (find != null) {
2357 final Object value = find.getObjectValue();
2358 ScriptFunction func = null;
2359 MethodHandle mh = null;
2360
2361 if (value instanceof ScriptFunction) {
2362 func = (ScriptFunction)value;
2363 mh = getCallMethodHandle(func, desc.getMethodType(), name);
2364 }
2365
2366 if (mh != null) {
2367 assert func != null;
2368 if (scopeAccess && func.isStrict()) {
2369 mh = bindTo(mh, UNDEFINED);
2370 }
2371
2372 return new GuardedInvocation(
2373 mh,
2374 find.isSelf()?
2375 getKnownFunctionPropertyGuardSelf(
2376 getMap(),
2377 find.getGetter(Object.class, INVALID_PROGRAM_POINT, request),
2378 func)
2379 :
2380 //TODO this always does a scriptobject check
2381 getKnownFunctionPropertyGuardProto(
2382 getMap(),
2383 find.getGetter(Object.class, INVALID_PROGRAM_POINT, request),
2384 find.getProtoChainLength(),
2385 func),
2386 getProtoSwitchPoints(NO_SUCH_PROPERTY_NAME, find.getOwner()),
2387 //TODO this doesn't need a ClassCastException as guard always checks script object
2388 null);
2389 }
2390 }
2391
2392 if (scopeAccess) {
2393 throw referenceError("not.defined", name);
2394 }
2395
2396 return createEmptyGetter(desc, explicitInstanceOfCheck(desc, request), name);
2397 }
2398
2399 /**
2400 * Invoke fall back if a property is not found.
2401 * @param key Name of property.
2402 * @param isScope is this a scope access?
2403 * @param programPoint program point
2404 * @return Result from call.
2405 */
2406 protected Object invokeNoSuchProperty(final Object key, final boolean isScope, final int programPoint) {
2407 final FindProperty find = findProperty(NO_SUCH_PROPERTY_NAME, true);
2408 final Object func = (find != null)? find.getObjectValue() : null;
2409
2410 Object ret = UNDEFINED;
2411 if (func instanceof ScriptFunction) {
2412 final ScriptFunction sfunc = (ScriptFunction)func;
2413 final Object self = isScope && sfunc.isStrict()? UNDEFINED : this;
2414 ret = ScriptRuntime.apply(sfunc, self, key);
2415 } else if (isScope) {
2416 throw referenceError("not.defined", key.toString());
2417 }
2418
2419 if (isValid(programPoint)) {
2420 throw new UnwarrantedOptimismException(ret, programPoint);
2421 }
2422
2423 return ret;
2424 }
2425
2426
2427 /**
2428 * Get __noSuchMethod__ as a function bound to this object and {@code name} if it is defined.
2429 * @param name the method name
2430 * @param isScope is this a scope access?
2431 * @return the bound function, or undefined
2432 */
2433 private Object getNoSuchMethod(final String name, final boolean isScope, final int programPoint) {
2434 final FindProperty find = findProperty(NO_SUCH_METHOD_NAME, true);
2435
2436 if (find == null) {
2437 return invokeNoSuchProperty(name, isScope, programPoint);
2438 }
2439
2440 final Object value = find.getObjectValue();
2441 if (!(value instanceof ScriptFunction)) {
2442 if (isScope) {
2443 throw referenceError("not.defined", name);
2444 }
2445 return UNDEFINED;
2446 }
2447
2448 final ScriptFunction func = (ScriptFunction)value;
2449 final Object self = isScope && func.isStrict()? UNDEFINED : this;
2450 return func.createBound(self, new Object[] {name});
2451 }
2452
2453 private GuardedInvocation createEmptyGetter(final CallSiteDescriptor desc, final boolean explicitInstanceOfCheck, final String name) {
2454 if (NashornCallSiteDescriptor.isOptimistic(desc)) {
2455 throw new UnwarrantedOptimismException(UNDEFINED, NashornCallSiteDescriptor.getProgramPoint(desc), Type.OBJECT);
2456 }
2457
2458 return new GuardedInvocation(Lookup.emptyGetter(desc.getMethodType().returnType()),
2459 NashornGuards.getMapGuard(getMap(), explicitInstanceOfCheck), getProtoSwitchPoints(name, null),
2460 explicitInstanceOfCheck ? null : ClassCastException.class);
2461 }
2462
2463 private abstract static class ScriptObjectIterator <T extends Object> implements Iterator<T> {
2464 protected T[] values;
2465 protected final ScriptObject object;
2466 private int index;
2467
2468 ScriptObjectIterator(final ScriptObject object) {
2469 this.object = object;
2470 }
2471
2472 protected abstract void init();
2473
2474 @Override
2475 public boolean hasNext() {
2476 if (values == null) {
2477 init();
2478 }
2479 return index < values.length;
2480 }
2481
2482 @Override
2483 public T next() {
2484 if (values == null) {
2485 init();
2486 }
2487 return values[index++];
2488 }
2489
2490 @Override
2491 public void remove() {
2492 throw new UnsupportedOperationException("remove");
2493 }
2494 }
2495
2496 private static class KeyIterator extends ScriptObjectIterator<String> {
2497 KeyIterator(final ScriptObject object) {
2498 super(object);
2499 }
2500
2501 @Override
2502 protected void init() {
2503 final Set<String> keys = new LinkedHashSet<>();
2504 final Set<String> nonEnumerable = new HashSet<>();
2505 for (ScriptObject self = object; self != null; self = self.getProto()) {
2506 keys.addAll(Arrays.asList(self.getOwnKeys(String.class, false, nonEnumerable)));
2507 }
2508 this.values = keys.toArray(new String[keys.size()]);
2509 }
2510 }
2511
2512 private static class ValueIterator extends ScriptObjectIterator<Object> {
2513 ValueIterator(final ScriptObject object) {
2514 super(object);
2515 }
2516
2517 @Override
2518 protected void init() {
2519 final ArrayList<Object> valueList = new ArrayList<>();
2520 final Set<String> nonEnumerable = new HashSet<>();
2521 for (ScriptObject self = object; self != null; self = self.getProto()) {
2522 for (final String key : self.getOwnKeys(String.class, false, nonEnumerable)) {
2523 valueList.add(self.get(key));
2524 }
2525 }
2526 this.values = valueList.toArray(new Object[valueList.size()]);
2527 }
2528 }
2529
2530 /**
2531 * Add a spill property for the given key.
2532 * @param key Property key.
2533 * @param flags Property flags.
2534 * @return Added property.
2535 */
2536 private Property addSpillProperty(final Object key, final int flags, final Object value, final boolean hasInitialValue) {
2537 final PropertyMap propertyMap = getMap();
2538 final int fieldSlot = propertyMap.getFreeFieldSlot();
2539 final int propertyFlags = flags | (useDualFields() ? Property.DUAL_FIELDS : 0);
2540
2541 Property property;
2542 if (fieldSlot > -1) {
2543 property = hasInitialValue ?
2544 new AccessorProperty(key, propertyFlags, fieldSlot, this, value) :
2545 new AccessorProperty(key, propertyFlags, getClass(), fieldSlot);
2546 property = addOwnProperty(property);
2547 } else {
2548 final int spillSlot = propertyMap.getFreeSpillSlot();
2549 property = hasInitialValue ?
2550 new SpillProperty(key, propertyFlags, spillSlot, this, value) :
2551 new SpillProperty(key, propertyFlags, spillSlot);
2552 property = addOwnProperty(property);
2553 ensureSpillSize(property.getSlot());
2554 }
2555 return property;
2556 }
2557
2558 /**
2559 * Add a spill entry for the given key.
2560 * @param key Property key.
2561 * @return Setter method handle.
2562 */
2563 MethodHandle addSpill(final Class<?> type, final String key) {
2564 return addSpillProperty(key, 0, null, false).getSetter(type, getMap());
2565 }
2566
2567 /**
2568 * Make sure arguments are paired correctly, with respect to more parameters than declared,
2569 * fewer parameters than declared and other things that JavaScript allows. This might involve
2570 * creating collectors.
2571 *
2572 * @param methodHandle method handle for invoke
2573 * @param callType type of the call
2574 *
2575 * @return method handle with adjusted arguments
2576 */
2577 protected static MethodHandle pairArguments(final MethodHandle methodHandle, final MethodType callType) {
2578 return pairArguments(methodHandle, callType, null);
2579 }
2580
2581 /**
2582 * Make sure arguments are paired correctly, with respect to more parameters than declared,
2583 * fewer parameters than declared and other things that JavaScript allows. This might involve
2584 * creating collectors.
2585 *
2586 * Make sure arguments are paired correctly.
2587 * @param methodHandle MethodHandle to adjust.
2588 * @param callType MethodType of the call site.
2589 * @param callerVarArg true if the caller is vararg, false otherwise, null if it should be inferred from the
2590 * {@code callType}; basically, if the last parameter type of the call site is an array, it'll be considered a
2591 * variable arity call site. These are ordinarily rare; Nashorn code generator creates variable arity call sites
2592 * when the call has more than {@link LinkerCallSite#ARGLIMIT} parameters.
2593 *
2594 * @return method handle with adjusted arguments
2595 */
2596 public static MethodHandle pairArguments(final MethodHandle methodHandle, final MethodType callType, final Boolean callerVarArg) {
2597 final MethodType methodType = methodHandle.type();
2598 if (methodType.equals(callType.changeReturnType(methodType.returnType()))) {
2599 return methodHandle;
2600 }
2601
2602 final int parameterCount = methodType.parameterCount();
2603 final int callCount = callType.parameterCount();
2604
2605 final boolean isCalleeVarArg = parameterCount > 0 && methodType.parameterType(parameterCount - 1).isArray();
2606 final boolean isCallerVarArg = callerVarArg != null ? callerVarArg : callCount > 0 &&
2607 callType.parameterType(callCount - 1).isArray();
2608
2609 if (isCalleeVarArg) {
2610 return isCallerVarArg ?
2611 methodHandle :
2612 MH.asCollector(methodHandle, Object[].class, callCount - parameterCount + 1);
2613 }
2614
2615 if (isCallerVarArg) {
2616 return adaptHandleToVarArgCallSite(methodHandle, callCount);
2617 }
2618
2619 if (callCount < parameterCount) {
2620 final int missingArgs = parameterCount - callCount;
2621 final Object[] fillers = new Object[missingArgs];
2622
2623 Arrays.fill(fillers, UNDEFINED);
2624
2625 if (isCalleeVarArg) {
2626 fillers[missingArgs - 1] = ScriptRuntime.EMPTY_ARRAY;
2627 }
2628
2629 return MH.insertArguments(
2630 methodHandle,
2631 parameterCount - missingArgs,
2632 fillers);
2633 }
2634
2635 if (callCount > parameterCount) {
2636 final int discardedArgs = callCount - parameterCount;
2637
2638 final Class<?>[] discards = new Class<?>[discardedArgs];
2639 Arrays.fill(discards, Object.class);
2640
2641 return MH.dropArguments(methodHandle, callCount - discardedArgs, discards);
2642 }
2643
2644 return methodHandle;
2645 }
2646
2647 static MethodHandle adaptHandleToVarArgCallSite(final MethodHandle mh, final int callSiteParamCount) {
2648 final int spreadArgs = mh.type().parameterCount() - callSiteParamCount + 1;
2649 return MH.filterArguments(
2650 MH.asSpreader(
2651 mh,
2652 Object[].class,
2653 spreadArgs),
2654 callSiteParamCount - 1,
2655 MH.insertArguments(
2656 TRUNCATINGFILTER,
2657 0,
2658 spreadArgs)
2659 );
2660 }
2661
2662 @SuppressWarnings("unused")
2663 private static Object[] truncatingFilter(final int n, final Object[] array) {
2664 final int length = array == null ? 0 : array.length;
2665 if (n == length) {
2666 return array == null ? ScriptRuntime.EMPTY_ARRAY : array;
2667 }
2668
2669 final Object[] newArray = new Object[n];
2670
2671 if (array != null) {
2672 System.arraycopy(array, 0, newArray, 0, Math.min(n, length));
2673 }
2674
2675 if (length < n) {
2676 final Object fill = UNDEFINED;
2677
2678 for (int i = length; i < n; i++) {
2679 newArray[i] = fill;
2680 }
2681 }
2682
2683 return newArray;
2684 }
2685
2686 /**
2687 * Numeric length setter for length property
2688 *
2689 * @param newLength new length to set
2690 */
2691 public final void setLength(final long newLength) {
2692 final ArrayData data = getArray();
2693 final long arrayLength = data.length();
2694 if (newLength == arrayLength) {
2695 return;
2696 }
2697
2698 if (newLength > arrayLength) {
2699 setArray(data.ensure(newLength - 1).safeDelete(arrayLength, newLength - 1, false));
2700 return;
2701 }
2702
2703 if (newLength < arrayLength) {
2704 long actualLength = newLength;
2705
2706 // Check for numeric keys in property map and delete them or adjust length, depending on whether
2707 // they're defined as configurable. See ES5 #15.4.5.2
2708 if (getMap().containsArrayKeys()) {
2709
2710 for (long l = arrayLength - 1; l >= newLength; l--) {
2711 final FindProperty find = findProperty(JSType.toString(l), false);
2712
2713 if (find != null) {
2714
2715 if (find.getProperty().isConfigurable()) {
2716 deleteOwnProperty(find.getProperty());
2717 } else {
2718 actualLength = l + 1;
2719 break;
2720 }
2721 }
2722 }
2723 }
2724
2725 setArray(data.shrink(actualLength));
2726 data.setLength(actualLength);
2727 }
2728 }
2729
2730 private int getInt(final int index, final Object key, final int programPoint) {
2731 if (isValidArrayIndex(index)) {
2732 for (ScriptObject object = this; ; ) {
2733 if (object.getMap().containsArrayKeys()) {
2734 final FindProperty find = object.findProperty(key, false, this);
2735
2736 if (find != null) {
2737 return getIntValue(find, programPoint);
2738 }
2739 }
2740
2741 if ((object = object.getProto()) == null) {
2742 break;
2743 }
2744
2745 final ArrayData array = object.getArray();
2746
2747 if (array.has(index)) {
2748 return isValid(programPoint) ?
2749 array.getIntOptimistic(index, programPoint) :
2750 array.getInt(index);
2751 }
2752 }
2753 } else {
2754 final FindProperty find = findProperty(key, true);
2755
2756 if (find != null) {
2757 return getIntValue(find, programPoint);
2758 }
2759 }
2760
2761 return JSType.toInt32(invokeNoSuchProperty(key, false, programPoint));
2762 }
2763
2764 @Override
2765 public int getInt(final Object key, final int programPoint) {
2766 final Object primitiveKey = JSType.toPrimitive(key, String.class);
2767 final int index = getArrayIndex(primitiveKey);
2768 final ArrayData array = getArray();
2769
2770 if (array.has(index)) {
2771 return isValid(programPoint) ? array.getIntOptimistic(index, programPoint) : array.getInt(index);
2772 }
2773
2774 return getInt(index, JSType.toPropertyKey(primitiveKey), programPoint);
2775 }
2776
2777 @Override
2778 public int getInt(final double key, final int programPoint) {
2779 final int index = getArrayIndex(key);
2780 final ArrayData array = getArray();
2781
2782 if (array.has(index)) {
2783 return isValid(programPoint) ? array.getIntOptimistic(index, programPoint) : array.getInt(index);
2784 }
2785
2786 return getInt(index, JSType.toString(key), programPoint);
2787 }
2788
2789 @Override
2790 public int getInt(final int key, final int programPoint) {
2791 final int index = getArrayIndex(key);
2792 final ArrayData array = getArray();
2793
2794 if (array.has(index)) {
2795 return isValid(programPoint) ? array.getIntOptimistic(key, programPoint) : array.getInt(key);
2796 }
2797
2798 return getInt(index, JSType.toString(key), programPoint);
2799 }
2800
2801 private double getDouble(final int index, final Object key, final int programPoint) {
2802 if (isValidArrayIndex(index)) {
2803 for (ScriptObject object = this; ; ) {
2804 if (object.getMap().containsArrayKeys()) {
2805 final FindProperty find = object.findProperty(key, false, this);
2806 if (find != null) {
2807 return getDoubleValue(find, programPoint);
2808 }
2809 }
2810
2811 if ((object = object.getProto()) == null) {
2812 break;
2813 }
2814
2815 final ArrayData array = object.getArray();
2816
2817 if (array.has(index)) {
2818 return isValid(programPoint) ?
2819 array.getDoubleOptimistic(index, programPoint) :
2820 array.getDouble(index);
2821 }
2822 }
2823 } else {
2824 final FindProperty find = findProperty(key, true);
2825
2826 if (find != null) {
2827 return getDoubleValue(find, programPoint);
2828 }
2829 }
2830
2831 return JSType.toNumber(invokeNoSuchProperty(key, false, INVALID_PROGRAM_POINT));
2832 }
2833
2834 @Override
2835 public double getDouble(final Object key, final int programPoint) {
2836 final Object primitiveKey = JSType.toPrimitive(key, String.class);
2837 final int index = getArrayIndex(primitiveKey);
2838 final ArrayData array = getArray();
2839
2840 if (array.has(index)) {
2841 return isValid(programPoint) ? array.getDoubleOptimistic(index, programPoint) : array.getDouble(index);
2842 }
2843
2844 return getDouble(index, JSType.toPropertyKey(primitiveKey), programPoint);
2845 }
2846
2847 @Override
2848 public double getDouble(final double key, final int programPoint) {
2849 final int index = getArrayIndex(key);
2850 final ArrayData array = getArray();
2851
2852 if (array.has(index)) {
2853 return isValid(programPoint) ? array.getDoubleOptimistic(index, programPoint) : array.getDouble(index);
2854 }
2855
2856 return getDouble(index, JSType.toString(key), programPoint);
2857 }
2858
2859 @Override
2860 public double getDouble(final int key, final int programPoint) {
2861 final int index = getArrayIndex(key);
2862 final ArrayData array = getArray();
2863
2864 if (array.has(index)) {
2865 return isValid(programPoint) ? array.getDoubleOptimistic(key, programPoint) : array.getDouble(key);
2866 }
2867
2868 return getDouble(index, JSType.toString(key), programPoint);
2869 }
2870
2871 private Object get(final int index, final Object key) {
2872 if (isValidArrayIndex(index)) {
2873 for (ScriptObject object = this; ; ) {
2874 if (object.getMap().containsArrayKeys()) {
2875 final FindProperty find = object.findProperty(key, false, this);
2876
2877 if (find != null) {
2878 return find.getObjectValue();
2879 }
2880 }
2881
2882 if ((object = object.getProto()) == null) {
2883 break;
2884 }
2885
2886 final ArrayData array = object.getArray();
2887
2888 if (array.has(index)) {
2889 return array.getObject(index);
2890 }
2891 }
2892 } else {
2893 final FindProperty find = findProperty(key, true);
2894
2895 if (find != null) {
2896 return find.getObjectValue();
2897 }
2898 }
2899
2900 return invokeNoSuchProperty(key, false, INVALID_PROGRAM_POINT);
2901 }
2902
2903 @Override
2904 public Object get(final Object key) {
2905 final Object primitiveKey = JSType.toPrimitive(key, String.class);
2906 final int index = getArrayIndex(primitiveKey);
2907 final ArrayData array = getArray();
2908
2909 if (array.has(index)) {
2910 return array.getObject(index);
2911 }
2912
2913 return get(index, JSType.toPropertyKey(primitiveKey));
2914 }
2915
2916 @Override
2917 public Object get(final double key) {
2918 final int index = getArrayIndex(key);
2919 final ArrayData array = getArray();
2920
2921 if (array.has(index)) {
2922 return array.getObject(index);
2923 }
2924
2925 return get(index, JSType.toString(key));
2926 }
2927
2928 @Override
2929 public Object get(final int key) {
2930 final int index = getArrayIndex(key);
2931 final ArrayData array = getArray();
2932
2933 if (array.has(index)) {
2934 return array.getObject(index);
2935 }
2936
2937 return get(index, JSType.toString(key));
2938 }
2939
2940 private boolean doesNotHaveCheckArrayKeys(final long longIndex, final int value, final int callSiteFlags) {
2941 if (getMap().containsArrayKeys()) {
2942 final String key = JSType.toString(longIndex);
2943 final FindProperty find = findProperty(key, true);
2944 if (find != null) {
2945 setObject(find, callSiteFlags, key, value);
2946 return true;
2947 }
2948 }
2949 return false;
2950 }
2951
2952 private boolean doesNotHaveCheckArrayKeys(final long longIndex, final long value, final int callSiteFlags) {
2953 if (getMap().containsArrayKeys()) {
2954 final String key = JSType.toString(longIndex);
2955 final FindProperty find = findProperty(key, true);
2956 if (find != null) {
2957 setObject(find, callSiteFlags, key, value);
2958 return true;
2959 }
2960 }
2961 return false;
2962 }
2963
2964 private boolean doesNotHaveCheckArrayKeys(final long longIndex, final double value, final int callSiteFlags) {
2965 if (getMap().containsArrayKeys()) {
2966 final String key = JSType.toString(longIndex);
2967 final FindProperty find = findProperty(key, true);
2968 if (find != null) {
2969 setObject(find, callSiteFlags, key, value);
2970 return true;
2971 }
2972 }
2973 return false;
2974 }
2975
2976 private boolean doesNotHaveCheckArrayKeys(final long longIndex, final Object value, final int callSiteFlags) {
2977 if (getMap().containsArrayKeys()) {
2978 final String key = JSType.toString(longIndex);
2979 final FindProperty find = findProperty(key, true);
2980 if (find != null) {
2981 setObject(find, callSiteFlags, key, value);
2982 return true;
2983 }
2984 }
2985 return false;
2986 }
2987
2988 //value agnostic
2989 private boolean doesNotHaveEnsureLength(final long longIndex, final long oldLength, final int callSiteFlags) {
2990 if (longIndex >= oldLength) {
2991 if (!isExtensible()) {
2992 if (isStrictFlag(callSiteFlags)) {
2993 throw typeError("object.non.extensible", JSType.toString(longIndex), ScriptRuntime.safeToString(this));
2994 }
2995 return true;
2996 }
2997 setArray(getArray().ensure(longIndex));
2998 }
2999 return false;
3000 }
3001
3002 private void doesNotHave(final int index, final int value, final int callSiteFlags) {
3003 final long oldLength = getArray().length();
3004 final long longIndex = ArrayIndex.toLongIndex(index);
3005 if (!doesNotHaveCheckArrayKeys(longIndex, value, callSiteFlags) && !doesNotHaveEnsureLength(longIndex, oldLength, callSiteFlags)) {
3006 final boolean strict = isStrictFlag(callSiteFlags);
3007 setArray(getArray().set(index, value, strict).safeDelete(oldLength, longIndex - 1, strict));
3008 }
3009 }
3010
3011 private void doesNotHave(final int index, final double value, final int callSiteFlags) {
3012 final long oldLength = getArray().length();
3013 final long longIndex = ArrayIndex.toLongIndex(index);
3014 if (!doesNotHaveCheckArrayKeys(longIndex, value, callSiteFlags) && !doesNotHaveEnsureLength(longIndex, oldLength, callSiteFlags)) {
3015 final boolean strict = isStrictFlag(callSiteFlags);
3016 setArray(getArray().set(index, value, strict).safeDelete(oldLength, longIndex - 1, strict));
3017 }
3018 }
3019
3020 private void doesNotHave(final int index, final Object value, final int callSiteFlags) {
3021 final long oldLength = getArray().length();
3022 final long longIndex = ArrayIndex.toLongIndex(index);
3023 if (!doesNotHaveCheckArrayKeys(longIndex, value, callSiteFlags) && !doesNotHaveEnsureLength(longIndex, oldLength, callSiteFlags)) {
3024 final boolean strict = isStrictFlag(callSiteFlags);
3025 setArray(getArray().set(index, value, strict).safeDelete(oldLength, longIndex - 1, strict));
3026 }
3027 }
3028
3029 /**
3030 * This is the most generic of all Object setters. Most of the others use this in some form.
3031 * TODO: should be further specialized
3032 *
3033 * @param find found property
3034 * @param callSiteFlags callsite flags
3035 * @param key property key
3036 * @param value property value
3037 */
3038 public final void setObject(final FindProperty find, final int callSiteFlags, final Object key, final Object value) {
3039 FindProperty f = find;
3040
3041 invalidateGlobalConstant(key);
3042
3043 if (f != null && f.isInherited() && !(f.getProperty() instanceof UserAccessorProperty)) {
3044 final boolean isScope = isScopeFlag(callSiteFlags);
3045 // If the start object of the find is not this object it means the property was found inside a
3046 // 'with' statement expression (see WithObject.findProperty()). In this case we forward the 'set'
3047 // to the 'with' object.
3048 // Note that although a 'set' operation involving a with statement follows scope rules outside
3049 // the 'with' expression (the 'set' operation is performed on the owning prototype if it exists),
3050 // it follows non-scope rules inside the 'with' expression (set is performed on the top level object).
3051 // This is why we clear the callsite flags and FindProperty in the forward call to the 'with' object.
3052 if (isScope && f.getSelf() != this) {
3053 f.getSelf().setObject(null, 0, key, value);
3054 return;
3055 }
3056 // Setting a property should not modify the property in prototype unless this is a scope callsite
3057 // and the owner is a scope object as well (with the exception of 'with' statement handled above).
3058 if (!isScope || !f.getOwner().isScope()) {
3059 f = null;
3060 }
3061 }
3062
3063 if (f != null) {
3064 if (!f.getProperty().isWritable()) {
3065 if (isScopeFlag(callSiteFlags) && f.getProperty().isLexicalBinding()) {
3066 throw typeError("assign.constant", key.toString()); // Overwriting ES6 const should throw also in non-strict mode.
3067 }
3068 if (isStrictFlag(callSiteFlags)) {
3069 throw typeError("property.not.writable", key.toString(), ScriptRuntime.safeToString(this));
3070 }
3071 return;
3072 }
3073
3074 f.setValue(value, isStrictFlag(callSiteFlags));
3075
3076 } else if (!isExtensible()) {
3077 if (isStrictFlag(callSiteFlags)) {
3078 throw typeError("object.non.extensible", key.toString(), ScriptRuntime.safeToString(this));
3079 }
3080 } else {
3081 ScriptObject sobj = this;
3082 // undefined scope properties are set in the global object.
3083 if (isScope()) {
3084 while (sobj != null && !(sobj instanceof Global)) {
3085 sobj = sobj.getProto();
3086 }
3087 assert sobj != null : "no parent global object in scope";
3088 }
3089 //this will unbox any Number object to its primitive type in case the
3090 //property supports primitive types, so it doesn't matter that it comes
3091 //in as an Object.
3092 sobj.addSpillProperty(key, 0, value, true);
3093 }
3094 }
3095
3096 @Override
3097 public void set(final Object key, final int value, final int callSiteFlags) {
3098 final Object primitiveKey = JSType.toPrimitive(key, String.class);
3099 final int index = getArrayIndex(primitiveKey);
3100
3101 if (isValidArrayIndex(index)) {
3102 final ArrayData data = getArray();
3103 if (data.has(index)) {
3104 setArray(data.set(index, value, isStrictFlag(callSiteFlags)));
3105 } else {
3106 doesNotHave(index, value, callSiteFlags);
3107 }
3108
3109 return;
3110 }
3111
3112 final Object propName = JSType.toPropertyKey(primitiveKey);
3113 setObject(findProperty(propName, true), callSiteFlags, propName, JSType.toObject(value));
3114 }
3115
3116 @Override
3117 public void set(final Object key, final double value, final int callSiteFlags) {
3118 final Object primitiveKey = JSType.toPrimitive(key, String.class);
3119 final int index = getArrayIndex(primitiveKey);
3120
3121 if (isValidArrayIndex(index)) {
3122 final ArrayData data = getArray();
3123 if (data.has(index)) {
3124 setArray(data.set(index, value, isStrictFlag(callSiteFlags)));
3125 } else {
3126 doesNotHave(index, value, callSiteFlags);
3127 }
3128
3129 return;
3130 }
3131
3132 final Object propName = JSType.toPropertyKey(primitiveKey);
3133 setObject(findProperty(propName, true), callSiteFlags, propName, JSType.toObject(value));
3134 }
3135
3136 @Override
3137 public void set(final Object key, final Object value, final int callSiteFlags) {
3138 final Object primitiveKey = JSType.toPrimitive(key, String.class);
3139 final int index = getArrayIndex(primitiveKey);
3140
3141 if (isValidArrayIndex(index)) {
3142 final ArrayData data = getArray();
3143 if (data.has(index)) {
3144 setArray(data.set(index, value, isStrictFlag(callSiteFlags)));
3145 } else {
3146 doesNotHave(index, value, callSiteFlags);
3147 }
3148
3149 return;
3150 }
3151
3152 final Object propName = JSType.toPropertyKey(primitiveKey);
3153 setObject(findProperty(propName, true), callSiteFlags, propName, value);
3154 }
3155
3156 @Override
3157 public void set(final double key, final int value, final int callSiteFlags) {
3158 final int index = getArrayIndex(key);
3159
3160 if (isValidArrayIndex(index)) {
3161 final ArrayData data = getArray();
3162 if (data.has(index)) {
3163 setArray(data.set(index, value, isStrictFlag(callSiteFlags)));
3164 } else {
3165 doesNotHave(index, value, callSiteFlags);
3166 }
3167
3168 return;
3169 }
3170
3171 final String propName = JSType.toString(key);
3172 setObject(findProperty(propName, true), callSiteFlags, propName, JSType.toObject(value));
3173 }
3174
3175 @Override
3176 public void set(final double key, final double value, final int callSiteFlags) {
3177 final int index = getArrayIndex(key);
3178
3179 if (isValidArrayIndex(index)) {
3180 final ArrayData data = getArray();
3181 if (data.has(index)) {
3182 setArray(data.set(index, value, isStrictFlag(callSiteFlags)));
3183 } else {
3184 doesNotHave(index, value, callSiteFlags);
3185 }
3186
3187 return;
3188 }
3189
3190 final String propName = JSType.toString(key);
3191 setObject(findProperty(propName, true), callSiteFlags, propName, JSType.toObject(value));
3192 }
3193
3194 @Override
3195 public void set(final double key, final Object value, final int callSiteFlags) {
3196 final int index = getArrayIndex(key);
3197
3198 if (isValidArrayIndex(index)) {
3199 final ArrayData data = getArray();
3200 if (data.has(index)) {
3201 setArray(data.set(index, value, isStrictFlag(callSiteFlags)));
3202 } else {
3203 doesNotHave(index, value, callSiteFlags);
3204 }
3205
3206 return;
3207 }
3208
3209 final String propName = JSType.toString(key);
3210 setObject(findProperty(propName, true), callSiteFlags, propName, value);
3211 }
3212
3213 @Override
3214 public void set(final int key, final int value, final int callSiteFlags) {
3215 final int index = getArrayIndex(key);
3216 if (isValidArrayIndex(index)) {
3217 if (getArray().has(index)) {
3218 final ArrayData data = getArray();
3219 setArray(data.set(index, value, isStrictFlag(callSiteFlags)));
3220 } else {
3221 doesNotHave(index, value, callSiteFlags);
3222 }
3223 return;
3224 }
3225
3226 final String propName = JSType.toString(key);
3227 setObject(findProperty(propName, true), callSiteFlags, propName, JSType.toObject(value));
3228 }
3229
3230 @Override
3231 public void set(final int key, final double value, final int callSiteFlags) {
3232 final int index = getArrayIndex(key);
3233
3234 if (isValidArrayIndex(index)) {
3235 final ArrayData data = getArray();
3236 if (data.has(index)) {
3237 setArray(data.set(index, value, isStrictFlag(callSiteFlags)));
3238 } else {
3239 doesNotHave(index, value, callSiteFlags);
3240 }
3241
3242 return;
3243 }
3244
3245 final String propName = JSType.toString(key);
3246 setObject(findProperty(propName, true), callSiteFlags, propName, JSType.toObject(value));
3247 }
3248
3249 @Override
3250 public void set(final int key, final Object value, final int callSiteFlags) {
3251 final int index = getArrayIndex(key);
3252
3253 if (isValidArrayIndex(index)) {
3254 final ArrayData data = getArray();
3255 if (data.has(index)) {
3256 setArray(data.set(index, value, isStrictFlag(callSiteFlags)));
3257 } else {
3258 doesNotHave(index, value, callSiteFlags);
3259 }
3260
3261 return;
3262 }
3263
3264 final String propName = JSType.toString(key);
3265 setObject(findProperty(propName, true), callSiteFlags, propName, value);
3266 }
3267
3268 @Override
3269 public boolean has(final Object key) {
3270 final Object primitiveKey = JSType.toPrimitive(key);
3271 final int index = getArrayIndex(primitiveKey);
3272 return isValidArrayIndex(index) ? hasArrayProperty(index) : hasProperty(JSType.toPropertyKey(primitiveKey), true);
3273 }
3274
3275 @Override
3276 public boolean has(final double key) {
3277 final int index = getArrayIndex(key);
3278 return isValidArrayIndex(index) ? hasArrayProperty(index) : hasProperty(JSType.toString(key), true);
3279 }
3280
3281 @Override
3282 public boolean has(final int key) {
3283 final int index = getArrayIndex(key);
3284 return isValidArrayIndex(index) ? hasArrayProperty(index) : hasProperty(JSType.toString(key), true);
3285 }
3286
3287 private boolean hasArrayProperty(final int index) {
3288 boolean hasArrayKeys = false;
3289
3290 for (ScriptObject self = this; self != null; self = self.getProto()) {
3291 if (self.getArray().has(index)) {
3292 return true;
3293 }
3294 hasArrayKeys = hasArrayKeys || self.getMap().containsArrayKeys();
3295 }
3296
3297 return hasArrayKeys && hasProperty(ArrayIndex.toKey(index), true);
3298 }
3299
3300 @Override
3301 public boolean hasOwnProperty(final Object key) {
3302 final Object primitiveKey = JSType.toPrimitive(key, String.class);
3303 final int index = getArrayIndex(primitiveKey);
3304 return isValidArrayIndex(index) ? hasOwnArrayProperty(index) : hasProperty(JSType.toPropertyKey(primitiveKey), false);
3305 }
3306
3307 @Override
3308 public boolean hasOwnProperty(final int key) {
3309 final int index = getArrayIndex(key);
3310 return isValidArrayIndex(index) ? hasOwnArrayProperty(index) : hasProperty(JSType.toString(key), false);
3311 }
3312
3313 @Override
3314 public boolean hasOwnProperty(final double key) {
3315 final int index = getArrayIndex(key);
3316 return isValidArrayIndex(index) ? hasOwnArrayProperty(index) : hasProperty(JSType.toString(key), false);
3317 }
3318
3319 private boolean hasOwnArrayProperty(final int index) {
3320 return getArray().has(index) || getMap().containsArrayKeys() && hasProperty(ArrayIndex.toKey(index), false);
3321 }
3322
3323 @Override
3324 public boolean delete(final int key, final boolean strict) {
3325 final int index = getArrayIndex(key);
3326 final ArrayData array = getArray();
3327
3328 if (array.has(index)) {
3329 if (array.canDelete(index, strict)) {
3330 setArray(array.delete(index));
3331 return true;
3332 }
3333 return false;
3334 }
3335 return deleteObject(JSType.toObject(key), strict);
3336 }
3337
3338 @Override
3339 public boolean delete(final double key, final boolean strict) {
3340 final int index = getArrayIndex(key);
3341 final ArrayData array = getArray();
3342
3343 if (array.has(index)) {
3344 if (array.canDelete(index, strict)) {
3345 setArray(array.delete(index));
3346 return true;
3347 }
3348 return false;
3349 }
3350
3351 return deleteObject(JSType.toObject(key), strict);
3352 }
3353
3354 @Override
3355 public boolean delete(final Object key, final boolean strict) {
3356 final Object primitiveKey = JSType.toPrimitive(key, String.class);
3357 final int index = getArrayIndex(primitiveKey);
3358 final ArrayData array = getArray();
3359
3360 if (array.has(index)) {
3361 if (array.canDelete(index, strict)) {
3362 setArray(array.delete(index));
3363 return true;
3364 }
3365 return false;
3366 }
3367
3368 return deleteObject(primitiveKey, strict);
3369 }
3370
3371 private boolean deleteObject(final Object key, final boolean strict) {
3372 final Object propName = JSType.toPropertyKey(key);
3373 final FindProperty find = findProperty(propName, false);
3374
3375 if (find == null) {
3376 return true;
3377 }
3378
3379 if (!find.getProperty().isConfigurable()) {
3380 if (strict) {
3381 throw typeError("cant.delete.property", propName.toString(), ScriptRuntime.safeToString(this));
3382 }
3383 return false;
3384 }
3385
3386 final Property prop = find.getProperty();
3387 deleteOwnProperty(prop);
3388
3389 return true;
3390 }
3391
3392 /**
3393 * Return a shallow copy of this ScriptObject.
3394 * @return a shallow copy.
3395 */
3396 public final ScriptObject copy() {
3397 try {
3398 return clone();
3399 } catch (final CloneNotSupportedException e) {
3400 throw new RuntimeException(e);
3401 }
3402 }
3403
3404 @Override
3405 protected ScriptObject clone() throws CloneNotSupportedException {
3406 final ScriptObject clone = (ScriptObject) super.clone();
3407 if (objectSpill != null) {
3408 clone.objectSpill = objectSpill.clone();
3409 if (primitiveSpill != null) {
3410 clone.primitiveSpill = primitiveSpill.clone();
3411 }
3412 }
3413 clone.arrayData = arrayData.copy();
3414 return clone;
3415 }
3416
3417 /**
3418 * Make a new UserAccessorProperty property. getter and setter functions are stored in
3419 * this ScriptObject and slot values are used in property object.
3420 *
3421 * @param key the property name
3422 * @param propertyFlags attribute flags of the property
3423 * @param getter getter function for the property
3424 * @param setter setter function for the property
3425 * @return the newly created UserAccessorProperty
3426 */
3427 protected final UserAccessorProperty newUserAccessors(final Object key, final int propertyFlags, final ScriptFunction getter, final ScriptFunction setter) {
3428 final UserAccessorProperty uc = getMap().newUserAccessors(key, propertyFlags);
3429 //property.getSetter(Object.class, getMap());
3430 uc.setAccessors(this, getMap(), new UserAccessorProperty.Accessors(getter, setter));
3431 return uc;
3432 }
3433
3434 /**
3435 * Returns {@code true} if properties for this object should use dual field mode, {@code false} otherwise.
3436 * @return {@code true} if dual fields should be used.
3437 */
3438 protected boolean useDualFields() {
3439 return !StructureLoader.isSingleFieldStructure(getClass().getName());
3440 }
3441
3442 Object ensureSpillSize(final int slot) {
3443 final int oldLength = objectSpill == null ? 0 : objectSpill.length;
3444 if (slot < oldLength) {
3445 return this;
3446 }
3447 final int newLength = alignUp(slot + 1, SPILL_RATE);
3448 final Object[] newObjectSpill = new Object[newLength];
3449 final long[] newPrimitiveSpill = useDualFields() ? new long[newLength] : null;
3450
3451 if (objectSpill != null) {
3452 System.arraycopy(objectSpill, 0, newObjectSpill, 0, oldLength);
3453 if (primitiveSpill != null && newPrimitiveSpill != null) {
3454 System.arraycopy(primitiveSpill, 0, newPrimitiveSpill, 0, oldLength);
3455 }
3456 }
3457
3458 this.primitiveSpill = newPrimitiveSpill;
3459 this.objectSpill = newObjectSpill;
3460
3461 return this;
3462 }
3463
3464 private static MethodHandle findOwnMH_V(final Class<? extends ScriptObject> clazz, final String name, final Class<?> rtype, final Class<?>... types) {
3465 // TODO: figure out how can it work for NativeArray$Prototype etc.
3466 return MH.findVirtual(MethodHandles.lookup(), ScriptObject.class, name, MH.type(rtype, types));
3467 }
3468
3469 private static MethodHandle findOwnMH_V(final String name, final Class<?> rtype, final Class<?>... types) {
3470 return findOwnMH_V(ScriptObject.class, name, rtype, types);
3471 }
3472
3473 private static MethodHandle findOwnMH_S(final String name, final Class<?> rtype, final Class<?>... types) {
3474 return MH.findStatic(MethodHandles.lookup(), ScriptObject.class, name, MH.type(rtype, types));
3475 }
3476
3477 private static MethodHandle getKnownFunctionPropertyGuardSelf(final PropertyMap map, final MethodHandle getter, final ScriptFunction func) {
3478 return MH.insertArguments(KNOWNFUNCPROPGUARDSELF, 1, map, getter, func);
3479 }
3480
3481 @SuppressWarnings("unused")
3482 private static boolean knownFunctionPropertyGuardSelf(final Object self, final PropertyMap map, final MethodHandle getter, final ScriptFunction func) {
3483 if (self instanceof ScriptObject && ((ScriptObject)self).getMap() == map) {
3484 try {
3485 return getter.invokeExact(self) == func;
3486 } catch (final RuntimeException | Error e) {
3487 throw e;
3488 } catch (final Throwable t) {
3489 throw new RuntimeException(t);
3490 }
3491 }
3492
3493 return false;
3494 }
3495
3496 private static MethodHandle getKnownFunctionPropertyGuardProto(final PropertyMap map, final MethodHandle getter, final int depth, final ScriptFunction func) {
3497 return MH.insertArguments(KNOWNFUNCPROPGUARDPROTO, 1, map, getter, depth, func);
3498 }
3499
3500 private static ScriptObject getProto(final ScriptObject self, final int depth) {
3501 ScriptObject proto = self;
3502 for (int d = 0; d < depth; d++) {
3503 proto = proto.getProto();
3504 if (proto == null) {
3505 return null;
3506 }
3507 }
3508
3509 return proto;
3510 }
3511
3512 @SuppressWarnings("unused")
3513 private static boolean knownFunctionPropertyGuardProto(final Object self, final PropertyMap map, final MethodHandle getter, final int depth, final ScriptFunction func) {
3514 if (self instanceof ScriptObject && ((ScriptObject)self).getMap() == map) {
3515 final ScriptObject proto = getProto((ScriptObject)self, depth);
3516 if (proto == null) {
3517 return false;
3518 }
3519 try {
3520 return getter.invokeExact((Object)proto) == func;
3521 } catch (final RuntimeException | Error e) {
3522 throw e;
3523 } catch (final Throwable t) {
3524 throw new RuntimeException(t);
3525 }
3526 }
3527
3528 return false;
3529 }
3530
3531 /** This is updated only in debug mode - counts number of {@code ScriptObject} instances created */
3532 private static LongAdder count;
3533
3534 static {
3535 if (Context.DEBUG) {
3536 count = new LongAdder();
3537 }
3538 }
3539 /**
3540 * Get number of {@code ScriptObject} instances created. If not running in debug
3541 * mode this is always 0
3542 *
3543 * @return number of ScriptObjects created
3544 */
3545 public static long getCount() {
3546 return count.longValue();
3547 }
3548 }