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.JSType.UNDEFINED_LONG;
37 import static jdk.nashorn.internal.runtime.PropertyDescriptor.CONFIGURABLE;
38 import static jdk.nashorn.internal.runtime.PropertyDescriptor.ENUMERABLE;
39 import static jdk.nashorn.internal.runtime.PropertyDescriptor.GET;
40 import static jdk.nashorn.internal.runtime.PropertyDescriptor.SET;
41 import static jdk.nashorn.internal.runtime.PropertyDescriptor.VALUE;
42 import static jdk.nashorn.internal.runtime.PropertyDescriptor.WRITABLE;
43 import static jdk.nashorn.internal.runtime.ScriptRuntime.UNDEFINED;
44 import static jdk.nashorn.internal.runtime.UnwarrantedOptimismException.INVALID_PROGRAM_POINT;
45 import static jdk.nashorn.internal.runtime.UnwarrantedOptimismException.isValid;
46 import static jdk.nashorn.internal.runtime.arrays.ArrayIndex.getArrayIndex;
47 import static jdk.nashorn.internal.runtime.arrays.ArrayIndex.isValidArrayIndex;
48 import static jdk.nashorn.internal.runtime.linker.NashornCallSiteDescriptor.isScopeFlag;
49 import static jdk.nashorn.internal.runtime.linker.NashornCallSiteDescriptor.isStrictFlag;
50 import static jdk.nashorn.internal.runtime.linker.NashornGuards.explicitInstanceOfCheck;
51
52 import java.lang.invoke.MethodHandle;
53 import java.lang.invoke.MethodHandles;
54 import java.lang.invoke.MethodType;
55 import java.lang.invoke.SwitchPoint;
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.internal.dynalink.CallSiteDescriptor;
69 import jdk.internal.dynalink.linker.GuardedInvocation;
70 import jdk.internal.dynalink.linker.LinkRequest;
71 import jdk.internal.dynalink.support.CallSiteDescriptorFactory;
72 import jdk.nashorn.internal.codegen.CompilerConstants.Call;
73 import jdk.nashorn.internal.codegen.ObjectClassGenerator;
74 import jdk.nashorn.internal.codegen.types.Type;
75 import jdk.nashorn.internal.lookup.Lookup;
76 import jdk.nashorn.internal.objects.AccessorPropertyDescriptor;
77 import jdk.nashorn.internal.objects.DataPropertyDescriptor;
78 import jdk.nashorn.internal.objects.Global;
79 import jdk.nashorn.internal.objects.NativeArray;
80 import jdk.nashorn.internal.runtime.arrays.ArrayData;
81 import jdk.nashorn.internal.runtime.arrays.ArrayIndex;
82 import jdk.nashorn.internal.runtime.linker.Bootstrap;
83 import jdk.nashorn.internal.runtime.linker.LinkerCallSite;
84 import jdk.nashorn.internal.runtime.linker.NashornCallSiteDescriptor;
85 import jdk.nashorn.internal.runtime.linker.NashornGuards;
86
87 /**
88 * Base class for generic JavaScript objects.
89 * <p>
90 * Notes:
91 * <ul>
92 * <li>The map is used to identify properties in the object.</li>
93 * <li>If the map is modified then it must be cloned and replaced. This notifies
94 * any code that made assumptions about the object that things have changed.
95 * Ex. CallSites that have been validated must check to see if the map has
96 * changed (or a map from a different object type) and hence relink the method
97 * to call.</li>
98 * <li>Modifications of the map include adding/deleting attributes or changing a
99 * function field value.</li>
100 * </ul>
101 */
102
103 public abstract class ScriptObject implements PropertyAccess, Cloneable {
104 /** __proto__ special property name inside object literals. ES6 draft. */
105 public static final String PROTO_PROPERTY_NAME = "__proto__";
106
107 /** Search fall back routine name for "no such method" */
108 public static final String NO_SUCH_METHOD_NAME = "__noSuchMethod__";
109
110 /** Search fall back routine name for "no such property" */
111 public static final String NO_SUCH_PROPERTY_NAME = "__noSuchProperty__";
112
113 /** Per ScriptObject flag - is this an array object? */
114 public static final int IS_ARRAY = 1 << 0;
115
116 /** Per ScriptObject flag - is this an arguments object? */
117 public static final int IS_ARGUMENTS = 1 << 1;
118
119 /** Is length property not-writable? */
120 public static final int IS_LENGTH_NOT_WRITABLE = 1 << 2;
121
122 /** Is this a builtin object? */
123 public static final int IS_BUILTIN = 1 << 3;
124
125 /**
126 * Spill growth rate - by how many elements does {@link ScriptObject#primitiveSpill} and
127 * {@link ScriptObject#objectSpill} when full
128 */
129 public static final int SPILL_RATE = 8;
130
131 /** Map to property information and accessor functions. Ordered by insertion. */
132 private PropertyMap map;
133
134 /** objects proto. */
135 private ScriptObject proto;
136
137 /** Object flags. */
138 private int flags;
139
140 /** Area for primitive properties added to object after instantiation, see {@link AccessorProperty} */
141 protected long[] primitiveSpill;
142
143 /** Area for reference properties added to object after instantiation, see {@link AccessorProperty} */
144 protected Object[] objectSpill;
145
146 /** Indexed array data. */
147 private ArrayData arrayData;
148
149 /** Method handle to retrieve prototype of this object */
150 public static final MethodHandle GETPROTO = findOwnMH_V("getProto", ScriptObject.class);
151
152 static final MethodHandle MEGAMORPHIC_GET = findOwnMH_V("megamorphicGet", Object.class, String.class, boolean.class);
153 static final MethodHandle GLOBALFILTER = findOwnMH_S("globalFilter", Object.class, Object.class);
154 static final MethodHandle DECLARE_AND_SET = findOwnMH_V("declareAndSet", void.class, String.class, Object.class);
155
156 private static final MethodHandle TRUNCATINGFILTER = findOwnMH_S("truncatingFilter", Object[].class, int.class, Object[].class);
157 private static final MethodHandle KNOWNFUNCPROPGUARDSELF = findOwnMH_S("knownFunctionPropertyGuardSelf", boolean.class, Object.class, PropertyMap.class, MethodHandle.class, ScriptFunction.class);
158 private static final MethodHandle KNOWNFUNCPROPGUARDPROTO = findOwnMH_S("knownFunctionPropertyGuardProto", boolean.class, Object.class, PropertyMap.class, MethodHandle.class, int.class, ScriptFunction.class);
159
160 private static final ArrayList<MethodHandle> PROTO_FILTERS = new ArrayList<>();
161
162 /** Method handle for getting the array data */
163 public static final Call GET_ARRAY = virtualCall(MethodHandles.lookup(), ScriptObject.class, "getArray", ArrayData.class);
164
165 /** Method handle for getting a function argument at a given index. Used from MapCreator */
166 public static final Call GET_ARGUMENT = virtualCall(MethodHandles.lookup(), ScriptObject.class, "getArgument", Object.class, int.class);
167
168 /** Method handle for setting a function argument at a given index. Used from MapCreator */
169 public static final Call SET_ARGUMENT = virtualCall(MethodHandles.lookup(), ScriptObject.class, "setArgument", void.class, int.class, Object.class);
170
171 /** Method handle for getting the proto of a ScriptObject */
172 public static final Call GET_PROTO = virtualCallNoLookup(ScriptObject.class, "getProto", ScriptObject.class);
173
174 /** Method handle for getting the proto of a ScriptObject */
175 public static final Call GET_PROTO_DEPTH = virtualCallNoLookup(ScriptObject.class, "getProto", ScriptObject.class, int.class);
176
177 /** Method handle for setting the proto of a ScriptObject */
178 public static final Call SET_GLOBAL_OBJECT_PROTO = staticCallNoLookup(ScriptObject.class, "setGlobalObjectProto", void.class, ScriptObject.class);
179
180 /** Method handle for setting the proto of a ScriptObject after checking argument */
181 public static final Call SET_PROTO_FROM_LITERAL = virtualCallNoLookup(ScriptObject.class, "setProtoFromLiteral", void.class, Object.class);
182
183 /** Method handle for setting the user accessors of a ScriptObject */
184 //TODO fastpath this
185 public static final Call SET_USER_ACCESSORS = virtualCall(MethodHandles.lookup(), ScriptObject.class, "setUserAccessors", void.class, String.class, ScriptFunction.class, ScriptFunction.class);
186
187 static final MethodHandle[] SET_SLOW = new MethodHandle[] {
188 findOwnMH_V("set", void.class, Object.class, int.class, int.class),
189 findOwnMH_V("set", void.class, Object.class, long.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 String key = property.getKey();
313 final Property oldProp = newMap.findProperty(key);
314 if (oldProp == null) {
315 if (! extensible) {
316 throw typeError("object.non.extensible", key, 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, 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 String key = property.getKey();
351
352 if (newMap.findProperty(key) == null) {
353 if (! extensible) {
354 throw typeError("object.non.extensible", key, 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 String 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 String 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 String 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 final String name = JSType.toString(key);
541
542 invalidateGlobalConstant(key);
543
544 if (current == UNDEFINED) {
545 if (isExtensible()) {
546 // add a new own property
547 addOwnProperty(key, desc);
548 return true;
549 }
550 // new property added to non-extensible object
551 if (reject) {
552 throw typeError(global, "object.non.extensible", name, ScriptRuntime.safeToString(this));
553 }
554 return false;
555 }
556
557 // modifying an existing property
558 final PropertyDescriptor currentDesc = (PropertyDescriptor)current;
559 final PropertyDescriptor newDesc = desc;
560
561 if (newDesc.type() == PropertyDescriptor.GENERIC && !newDesc.has(CONFIGURABLE) && !newDesc.has(ENUMERABLE)) {
562 // every descriptor field is absent
563 return true;
564 }
565
566 if (newDesc.hasAndEquals(currentDesc)) {
567 // every descriptor field of the new is same as the current
568 return true;
569 }
570
571 if (!currentDesc.isConfigurable()) {
572 if (newDesc.has(CONFIGURABLE) && newDesc.isConfigurable()) {
573 // not configurable can not be made configurable
574 if (reject) {
575 throw typeError(global, "cant.redefine.property", name, ScriptRuntime.safeToString(this));
576 }
577 return false;
578 }
579
580 if (newDesc.has(ENUMERABLE) &&
581 currentDesc.isEnumerable() != newDesc.isEnumerable()) {
582 // cannot make non-enumerable as enumerable or vice-versa
583 if (reject) {
584 throw typeError(global, "cant.redefine.property", name, ScriptRuntime.safeToString(this));
585 }
586 return false;
587 }
588 }
589
590 int propFlags = Property.mergeFlags(currentDesc, newDesc);
591 Property property = getMap().findProperty(key);
592
593 if (currentDesc.type() == PropertyDescriptor.DATA &&
594 (newDesc.type() == PropertyDescriptor.DATA ||
595 newDesc.type() == PropertyDescriptor.GENERIC)) {
596 if (!currentDesc.isConfigurable() && !currentDesc.isWritable()) {
597 if (newDesc.has(WRITABLE) && newDesc.isWritable() ||
598 newDesc.has(VALUE) && !ScriptRuntime.sameValue(currentDesc.getValue(), newDesc.getValue())) {
599 if (reject) {
600 throw typeError(global, "cant.redefine.property", name, ScriptRuntime.safeToString(this));
601 }
602 return false;
603 }
604 }
605
606 final boolean newValue = newDesc.has(VALUE);
607 final Object value = newValue ? newDesc.getValue() : currentDesc.getValue();
608
609 if (newValue && property != null) {
610 // Temporarily clear flags.
611 property = modifyOwnProperty(property, 0);
612 set(key, value, 0);
613 //this might change the map if we change types of the property
614 //hence we need to read it again. note that we should probably
615 //have the setter return the new property throughout and in
616 //general respect Property return values from modify and add
617 //functions - which we don't seem to do at all here :-(
618 //There is already a bug filed to generify PropertyAccess so we
619 //can have the setter return e.g. a Property
620 property = getMap().findProperty(key);
621 }
622
623 if (property == null) {
624 // promoting an arrayData value to actual property
625 addOwnProperty(key, propFlags, value);
626 checkIntegerKey(key);
627 } else {
628 // Now set the new flags
629 modifyOwnProperty(property, propFlags);
630 }
631 } else if (currentDesc.type() == PropertyDescriptor.ACCESSOR &&
632 (newDesc.type() == PropertyDescriptor.ACCESSOR ||
633 newDesc.type() == PropertyDescriptor.GENERIC)) {
634 if (!currentDesc.isConfigurable()) {
635 if (newDesc.has(PropertyDescriptor.GET) && !ScriptRuntime.sameValue(currentDesc.getGetter(), newDesc.getGetter()) ||
636 newDesc.has(PropertyDescriptor.SET) && !ScriptRuntime.sameValue(currentDesc.getSetter(), newDesc.getSetter())) {
637 if (reject) {
638 throw typeError(global, "cant.redefine.property", name, ScriptRuntime.safeToString(this));
639 }
640 return false;
641 }
642 }
643 // New set the new features.
644 modifyOwnProperty(property, propFlags,
645 newDesc.has(GET) ? newDesc.getGetter() : currentDesc.getGetter(),
646 newDesc.has(SET) ? newDesc.getSetter() : currentDesc.getSetter());
647 } else {
648 // changing descriptor type
649 if (!currentDesc.isConfigurable()) {
650 // not configurable can not be made configurable
651 if (reject) {
652 throw typeError(global, "cant.redefine.property", name, ScriptRuntime.safeToString(this));
653 }
654 return false;
655 }
656
657 propFlags = 0;
658
659 // Preserve only configurable and enumerable from current desc
660 // if those are not overridden in the new property descriptor.
661 boolean value = newDesc.has(CONFIGURABLE) ? newDesc.isConfigurable() : currentDesc.isConfigurable();
662 if (!value) {
663 propFlags |= Property.NOT_CONFIGURABLE;
664 }
665 value = newDesc.has(ENUMERABLE)? newDesc.isEnumerable() : currentDesc.isEnumerable();
666 if (!value) {
667 propFlags |= Property.NOT_ENUMERABLE;
668 }
669
670 final int type = newDesc.type();
671 if (type == PropertyDescriptor.DATA) {
672 // get writable from the new descriptor
673 value = newDesc.has(WRITABLE) && newDesc.isWritable();
674 if (!value) {
675 propFlags |= Property.NOT_WRITABLE;
676 }
677
678 // delete the old property
679 deleteOwnProperty(property);
680 // add new data property
681 addOwnProperty(key, propFlags, newDesc.getValue());
682 } else if (type == PropertyDescriptor.ACCESSOR) {
683 if (property == null) {
684 addOwnProperty(key, propFlags,
685 newDesc.has(GET) ? newDesc.getGetter() : null,
686 newDesc.has(SET) ? newDesc.getSetter() : null);
687 } else {
688 // Modify old property with the new features.
689 modifyOwnProperty(property, propFlags,
690 newDesc.has(GET) ? newDesc.getGetter() : null,
691 newDesc.has(SET) ? newDesc.getSetter() : null);
692 }
693 }
694 }
695
696 checkIntegerKey(key);
697
698 return true;
699 }
700
701 /**
702 * Almost like defineOwnProperty(int,Object) for arrays this one does
703 * not add 'gap' elements (like the array one does).
704 *
705 * @param index key for property
706 * @param value value to define
707 */
708 public void defineOwnProperty(final int index, final Object value) {
709 assert isValidArrayIndex(index) : "invalid array index";
710 final long longIndex = ArrayIndex.toLongIndex(index);
711 final long oldLength = getArray().length();
712 if (longIndex >= oldLength) {
713 setArray(getArray().ensure(longIndex));
714 doesNotHaveEnsureDelete(longIndex, oldLength, false);
715 }
716 setArray(getArray().set(index, value, false));
717 }
718
719 private void checkIntegerKey(final String key) {
720 final int index = getArrayIndex(key);
721
722 if (isValidArrayIndex(index)) {
723 final ArrayData data = getArray();
724
725 if (data.has(index)) {
726 setArray(data.delete(index));
727 }
728 }
729 }
730
731 /**
732 * Add a new property to the object.
733 *
734 * @param key property key
735 * @param propertyDesc property descriptor for property
736 */
737 public final void addOwnProperty(final String key, final PropertyDescriptor propertyDesc) {
738 // Already checked that there is no own property with that key.
739 PropertyDescriptor pdesc = propertyDesc;
740
741 final int propFlags = Property.toFlags(pdesc);
742
743 if (pdesc.type() == PropertyDescriptor.GENERIC) {
744 final Global global = Context.getGlobal();
745 final PropertyDescriptor dDesc = global.newDataDescriptor(UNDEFINED, false, false, false);
746
747 dDesc.fillFrom((ScriptObject)pdesc);
748 pdesc = dDesc;
749 }
750
751 final int type = pdesc.type();
752 if (type == PropertyDescriptor.DATA) {
753 addOwnProperty(key, propFlags, pdesc.getValue());
754 } else if (type == PropertyDescriptor.ACCESSOR) {
755 addOwnProperty(key, propFlags,
756 pdesc.has(GET) ? pdesc.getGetter() : null,
757 pdesc.has(SET) ? pdesc.getSetter() : null);
758 }
759
760 checkIntegerKey(key);
761 }
762
763 /**
764 * Low level property API (not using property descriptors)
765 * <p>
766 * Find a property in the prototype hierarchy. Note: this is final and not
767 * a good idea to override. If you have to, use
768 * {jdk.nashorn.internal.objects.NativeArray{@link #getProperty(String)} or
769 * {jdk.nashorn.internal.objects.NativeArray{@link #getPropertyDescriptor(String)} as the
770 * overriding way to find array properties
771 *
772 * @see jdk.nashorn.internal.objects.NativeArray
773 *
774 * @param key Property key.
775 * @param deep Whether the search should look up proto chain.
776 *
777 * @return FindPropertyData or null if not found.
778 */
779 public final FindProperty findProperty(final String key, final boolean deep) {
780 return findProperty(key, deep, this);
781 }
782
783 /**
784 * Low level property API (not using property descriptors)
785 * <p>
786 * Find a property in the prototype hierarchy. Note: this is not a good idea
787 * to override except as it was done in {@link WithObject}.
788 * If you have to, use
789 * {jdk.nashorn.internal.objects.NativeArray{@link #getProperty(String)} or
790 * {jdk.nashorn.internal.objects.NativeArray{@link #getPropertyDescriptor(String)} as the
791 * overriding way to find array properties
792 *
793 * @see jdk.nashorn.internal.objects.NativeArray
794 *
795 * @param key Property key.
796 * @param deep Whether the search should look up proto chain.
797 * @param start the object on which the lookup was originally initiated
798 *
799 * @return FindPropertyData or null if not found.
800 */
801 protected FindProperty findProperty(final String key, final boolean deep, final ScriptObject start) {
802
803 final PropertyMap selfMap = getMap();
804 final Property property = selfMap.findProperty(key);
805
806 if (property != null) {
807 return new FindProperty(start, this, property);
808 }
809
810 if (deep) {
811 final ScriptObject myProto = getProto();
812 if (myProto != null) {
813 return myProto.findProperty(key, deep, start);
814 }
815 }
816
817 return null;
818 }
819
820 /**
821 * Low level property API. This is similar to {@link #findProperty(String, 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 String 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, deep);
836 }
837 }
838
839 return false;
840 }
841
842 private SwitchPoint findBuiltinSwitchPoint(final String 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 String 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 String 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 long getLongValue(final FindProperty find, final int programPoint) {
1089 final MethodHandle getter = find.getGetter(long.class, programPoint, null);
1090 if (getter != null) {
1091 try {
1092 return (long)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_LONG;
1101 }
1102
1103 private static double getDoubleValue(final FindProperty find, final int programPoint) {
1104 final MethodHandle getter = find.getGetter(double.class, programPoint, null);
1105 if (getter != null) {
1106 try {
1107 return (double)getter.invokeExact((Object)find.getGetterReceiver());
1108 } catch (final Error|RuntimeException e) {
1109 throw e;
1110 } catch (final Throwable e) {
1111 throw new RuntimeException(e);
1112 }
1113 }
1114
1115 return UNDEFINED_DOUBLE;
1116 }
1117
1118 /**
1119 * Return methodHandle of value function for call.
1120 *
1121 * @param find data from find property.
1122 * @param type method type of function.
1123 * @param bindName null or name to bind to second argument (property not found method.)
1124 *
1125 * @return value of property as a MethodHandle or null.
1126 */
1127 protected MethodHandle getCallMethodHandle(final FindProperty find, final MethodType type, final String bindName) {
1128 return getCallMethodHandle(find.getObjectValue(), type, bindName);
1129 }
1130
1131 /**
1132 * Return methodHandle of value function for call.
1133 *
1134 * @param value value of receiver, it not a {@link ScriptFunction} this will return null.
1135 * @param type method type of function.
1136 * @param bindName null or name to bind to second argument (property not found method.)
1137 *
1138 * @return value of property as a MethodHandle or null.
1139 */
1140 protected static MethodHandle getCallMethodHandle(final Object value, final MethodType type, final String bindName) {
1141 return value instanceof ScriptFunction ? ((ScriptFunction)value).getCallMethodHandle(type, bindName) : null;
1142 }
1143
1144 /**
1145 * Get value using found property.
1146 *
1147 * @param property Found property.
1148 *
1149 * @return Value of property.
1150 */
1151 public final Object getWithProperty(final Property property) {
1152 return new FindProperty(this, this, property).getObjectValue();
1153 }
1154
1155 /**
1156 * Get a property given a key
1157 *
1158 * @param key property key
1159 *
1160 * @return property for key
1161 */
1162 public final Property getProperty(final String key) {
1163 return getMap().findProperty(key);
1164 }
1165
1166 /**
1167 * Overridden by {@link jdk.nashorn.internal.objects.NativeArguments} class (internal use.)
1168 * Used for argument access in a vararg function using parameter name.
1169 * Returns the argument at a given key (index)
1170 *
1171 * @param key argument index
1172 *
1173 * @return the argument at the given position, or undefined if not present
1174 */
1175 public Object getArgument(final int key) {
1176 return get(key);
1177 }
1178
1179 /**
1180 * Overridden by {@link jdk.nashorn.internal.objects.NativeArguments} class (internal use.)
1181 * Used for argument access in a vararg function using parameter name.
1182 * Returns the argument at a given key (index)
1183 *
1184 * @param key argument index
1185 * @param value the value to write at the given index
1186 */
1187 public void setArgument(final int key, final Object value) {
1188 set(key, value, 0);
1189 }
1190
1191 /**
1192 * Return the current context from the object's map.
1193 * @return Current context.
1194 */
1195 protected Context getContext() {
1196 return Context.fromClass(getClass());
1197 }
1198
1199 /**
1200 * Return the map of an object.
1201 * @return PropertyMap object.
1202 */
1203 public final PropertyMap getMap() {
1204 return map;
1205 }
1206
1207 /**
1208 * Set the initial map.
1209 * @param map Initial map.
1210 */
1211 public final void setMap(final PropertyMap map) {
1212 this.map = map;
1213 }
1214
1215 /**
1216 * Conditionally set the new map if the old map is the same.
1217 * @param oldMap Map prior to manipulation.
1218 * @param newMap Replacement map.
1219 * @return true if the operation succeeded.
1220 */
1221 protected final boolean compareAndSetMap(final PropertyMap oldMap, final PropertyMap newMap) {
1222 if (oldMap == this.map) {
1223 this.map = newMap;
1224 return true;
1225 }
1226 return false;
1227 }
1228
1229 /**
1230 * Return the __proto__ of an object.
1231 * @return __proto__ object.
1232 */
1233 public final ScriptObject getProto() {
1234 return proto;
1235 }
1236
1237 /**
1238 * Get the proto of a specific depth
1239 * @param n depth
1240 * @return proto at given depth
1241 */
1242 public final ScriptObject getProto(final int n) {
1243 assert n > 0;
1244 ScriptObject p = getProto();
1245 for (int i = n; i-- > 0;) {
1246 p = p.getProto();
1247 }
1248 return p;
1249 }
1250
1251 /**
1252 * Set the __proto__ of an object.
1253 * @param newProto new __proto__ to set.
1254 */
1255 public final void setProto(final ScriptObject newProto) {
1256 final ScriptObject oldProto = proto;
1257
1258 if (oldProto != newProto) {
1259 proto = newProto;
1260
1261 // Let current listeners know that the prototype has changed and set our map
1262 final PropertyListeners listeners = getMap().getListeners();
1263 if (listeners != null) {
1264 listeners.protoChanged();
1265 }
1266 // Replace our current allocator map with one that is associated with the new prototype.
1267 setMap(getMap().changeProto(newProto));
1268 }
1269 }
1270
1271 /**
1272 * Set the initial __proto__ of this object. This should be used instead of
1273 * {@link #setProto} if it is known that the current property map will not be
1274 * used on a new object with any other parent property map, so we can pass over
1275 * property map invalidation/evolution.
1276 *
1277 * @param initialProto the initial __proto__ to set.
1278 */
1279 public void setInitialProto(final ScriptObject initialProto) {
1280 this.proto = initialProto;
1281 }
1282
1283 /**
1284 * Invoked from generated bytecode to initialize the prototype of object literals to the global Object prototype.
1285 * @param obj the object literal that needs to have its prototype initialized to the global Object prototype.
1286 */
1287 public static void setGlobalObjectProto(final ScriptObject obj) {
1288 obj.setInitialProto(Global.objectPrototype());
1289 }
1290
1291 /**
1292 * Set the __proto__ of an object with checks.
1293 * This is the built-in operation [[SetPrototypeOf]]
1294 * See ES6 draft spec: 9.1.2 [[SetPrototypeOf]] (V)
1295 *
1296 * @param newProto Prototype to set.
1297 */
1298 public final void setPrototypeOf(final Object newProto) {
1299 if (newProto == null || newProto instanceof ScriptObject) {
1300 if (! isExtensible()) {
1301 // okay to set same proto again - even if non-extensible
1302
1303 if (newProto == getProto()) {
1304 return;
1305 }
1306 throw typeError("__proto__.set.non.extensible", ScriptRuntime.safeToString(this));
1307 }
1308
1309 // check for circularity
1310 ScriptObject p = (ScriptObject)newProto;
1311 while (p != null) {
1312 if (p == this) {
1313 throw typeError("circular.__proto__.set", ScriptRuntime.safeToString(this));
1314 }
1315 p = p.getProto();
1316 }
1317 setProto((ScriptObject)newProto);
1318 } else {
1319 throw typeError("cant.set.proto.to.non.object", ScriptRuntime.safeToString(this), ScriptRuntime.safeToString(newProto));
1320 }
1321 }
1322
1323 /**
1324 * Set the __proto__ of an object from an object literal.
1325 * See ES6 draft spec: B.3.1 __proto__ Property Names in
1326 * Object Initializers. Step 6 handling of "__proto__".
1327 *
1328 * @param newProto Prototype to set.
1329 */
1330 public final void setProtoFromLiteral(final Object newProto) {
1331 if (newProto == null || newProto instanceof ScriptObject) {
1332 setPrototypeOf(newProto);
1333 } else {
1334 // Some non-object, non-null. Then, we need to set
1335 // Object.prototype as the new __proto__
1336 //
1337 // var obj = { __proto__ : 34 };
1338 // print(obj.__proto__ === Object.prototype); // => true
1339 setPrototypeOf(Global.objectPrototype());
1340 }
1341 }
1342
1343 /**
1344 * return an array of all property keys - all inherited, non-enumerable included.
1345 * This is meant for source code completion by interactive shells or editors.
1346 *
1347 * @return Array of keys, order of properties is undefined.
1348 */
1349 public String[] getAllKeys() {
1350 final Set<String> keys = new HashSet<>();
1351 final Set<String> nonEnumerable = new HashSet<>();
1352 for (ScriptObject self = this; self != null; self = self.getProto()) {
1353 keys.addAll(Arrays.asList(self.getOwnKeys(true, nonEnumerable)));
1354 }
1355 return keys.toArray(new String[keys.size()]);
1356 }
1357
1358 /**
1359 * return an array of own property keys associated with the object.
1360 *
1361 * @param all True if to include non-enumerable keys.
1362 * @return Array of keys.
1363 */
1364 public final String[] getOwnKeys(final boolean all) {
1365 return getOwnKeys(all, null);
1366 }
1367
1368 /**
1369 * return an array of own property keys associated with the object.
1370 *
1371 * @param all True if to include non-enumerable keys.
1372 * @param nonEnumerable set of non-enumerable properties seen already.Used
1373 to filter out shadowed, but enumerable properties from proto children.
1374 * @return Array of keys.
1375 */
1376 protected String[] getOwnKeys(final boolean all, final Set<String> nonEnumerable) {
1377 final List<Object> keys = new ArrayList<>();
1378 final PropertyMap selfMap = this.getMap();
1379
1380 final ArrayData array = getArray();
1381
1382 for (final Iterator<Long> iter = array.indexIterator(); iter.hasNext(); ) {
1383 keys.add(JSType.toString(iter.next().longValue()));
1384 }
1385
1386 for (final Property property : selfMap.getProperties()) {
1387 final boolean enumerable = property.isEnumerable();
1388 final String key = property.getKey();
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(key);
1401 }
1402 }
1403 }
1404
1405 return keys.toArray(new String[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 final int c = desc.getNameTokenCount();
1842 // JavaScript is "immune" to all currently defined Dynalink composite operation - getProp is the same as getElem
1843 // is the same as getMethod as JavaScript objects have a single namespace for all three. Therefore, we don't
1844 // care about them, and just link to whatever is the first operation.
1845 final String operator = CallSiteDescriptorFactory.tokenizeOperators(desc).get(0);
1846 // NOTE: we support getElem and setItem as JavaScript doesn't distinguish items from properties. Nashorn itself
1847 // emits "dyn:getProp:identifier" for "<expr>.<identifier>" and "dyn:getElem" for "<expr>[<expr>]", but we are
1848 // more flexible here and dispatch not on operation name (getProp vs. getElem), but rather on whether the
1849 // operation has an associated name or not.
1850 switch (operator) {
1851 case "getProp":
1852 case "getElem":
1853 case "getMethod":
1854 return c > 2 ? findGetMethod(desc, request, operator) : findGetIndexMethod(desc, request);
1855 case "setProp":
1856 case "setElem":
1857 return c > 2 ? findSetMethod(desc, request) : findSetIndexMethod(desc, request);
1858 case "call":
1859 return findCallMethod(desc, request);
1860 case "new":
1861 return findNewMethod(desc, request);
1862 case "callMethod":
1863 return findCallMethodMethod(desc, request);
1864 default:
1865 return null;
1866 }
1867 }
1868
1869 /**
1870 * Find the appropriate New method for an invoke dynamic call.
1871 *
1872 * @param desc The invoke dynamic call site descriptor.
1873 * @param request The link request
1874 *
1875 * @return GuardedInvocation to be invoked at call site.
1876 */
1877 protected GuardedInvocation findNewMethod(final CallSiteDescriptor desc, final LinkRequest request) {
1878 return notAFunction(desc);
1879 }
1880
1881 /**
1882 * Find the appropriate CALL method for an invoke dynamic call.
1883 * This generates "not a function" always
1884 *
1885 * @param desc the call site descriptor.
1886 * @param request the link request
1887 *
1888 * @return GuardedInvocation to be invoked at call site.
1889 */
1890 protected GuardedInvocation findCallMethod(final CallSiteDescriptor desc, final LinkRequest request) {
1891 return notAFunction(desc);
1892 }
1893
1894 private GuardedInvocation notAFunction(final CallSiteDescriptor desc) {
1895 throw typeError("not.a.function", NashornCallSiteDescriptor.getFunctionErrorMessage(desc, this));
1896 }
1897
1898 /**
1899 * Find an implementation for a "dyn:callMethod" operation. Note that Nashorn internally never uses
1900 * "dyn:callMethod", but instead always emits two call sites in bytecode, one for "dyn:getMethod", and then another
1901 * one for "dyn:call". Explicit support for "dyn:callMethod" is provided for the benefit of potential external
1902 * callers. The implementation itself actually folds a "dyn:getMethod" method handle into a "dyn:call" method handle.
1903 *
1904 * @param desc the call site descriptor.
1905 * @param request the link request
1906 *
1907 * @return GuardedInvocation to be invoked at call site.
1908 */
1909 protected GuardedInvocation findCallMethodMethod(final CallSiteDescriptor desc, final LinkRequest request) {
1910 // R(P0, P1, ...)
1911 final MethodType callType = desc.getMethodType();
1912 // use type Object(P0) for the getter
1913 final CallSiteDescriptor getterType = desc.changeMethodType(MethodType.methodType(Object.class, callType.parameterType(0)));
1914 final GuardedInvocation getter = findGetMethod(getterType, request, "getMethod");
1915
1916 // Object(P0) => Object(P0, P1, ...)
1917 final MethodHandle argDroppingGetter = MH.dropArguments(getter.getInvocation(), 1, callType.parameterList().subList(1, callType.parameterCount()));
1918 // R(Object, P0, P1, ...)
1919 final MethodHandle invoker = Bootstrap.createDynamicInvoker("dyn:call", callType.insertParameterTypes(0, argDroppingGetter.type().returnType()));
1920 // Fold Object(P0, P1, ...) into R(Object, P0, P1, ...) => R(P0, P1, ...)
1921 return getter.replaceMethods(MH.foldArguments(invoker, argDroppingGetter), getter.getGuard());
1922 }
1923
1924 /**
1925 * Test whether this object contains in its prototype chain or is itself a with-object.
1926 * @return true if a with-object was found
1927 */
1928 boolean hasWithScope() {
1929 return false;
1930 }
1931
1932 /**
1933 * Add a filter to the first argument of {@code methodHandle} that calls its {@link #getProto()} method
1934 * {@code depth} times.
1935 * @param methodHandle a method handle
1936 * @param depth distance to target prototype
1937 * @return the filtered method handle
1938 */
1939 static MethodHandle addProtoFilter(final MethodHandle methodHandle, final int depth) {
1940 if (depth == 0) {
1941 return methodHandle;
1942 }
1943 final int listIndex = depth - 1; // We don't need 0-deep walker
1944 MethodHandle filter = listIndex < PROTO_FILTERS.size() ? PROTO_FILTERS.get(listIndex) : null;
1945
1946 if (filter == null) {
1947 filter = addProtoFilter(GETPROTO, depth - 1);
1948 PROTO_FILTERS.add(null);
1949 PROTO_FILTERS.set(listIndex, filter);
1950 }
1951
1952 return MH.filterArguments(methodHandle, 0, filter.asType(filter.type().changeReturnType(methodHandle.type().parameterType(0))));
1953 }
1954
1955 /**
1956 * Find the appropriate GET method for an invoke dynamic call.
1957 *
1958 * @param desc the call site descriptor
1959 * @param request the link request
1960 * @param operator operator for get: getProp, getMethod, getElem etc
1961 *
1962 * @return GuardedInvocation to be invoked at call site.
1963 */
1964 protected GuardedInvocation findGetMethod(final CallSiteDescriptor desc, final LinkRequest request, final String operator) {
1965 final boolean explicitInstanceOfCheck = explicitInstanceOfCheck(desc, request);
1966
1967 String name;
1968 name = desc.getNameToken(CallSiteDescriptor.NAME_OPERAND);
1969 if (NashornCallSiteDescriptor.isApplyToCall(desc)) {
1970 if (Global.isBuiltinFunctionPrototypeApply()) {
1971 name = "call";
1972 }
1973 }
1974
1975 if (request.isCallSiteUnstable() || hasWithScope()) {
1976 return findMegaMorphicGetMethod(desc, name, "getMethod".equals(operator));
1977 }
1978
1979 final FindProperty find = findProperty(name, true);
1980 MethodHandle mh;
1981
1982 if (find == null) {
1983 switch (operator) {
1984 case "getElem": // getElem only gets here if element name is constant, so treat it like a property access
1985 case "getProp":
1986 return noSuchProperty(desc, request);
1987 case "getMethod":
1988 return noSuchMethod(desc, request);
1989 default:
1990 throw new AssertionError(operator); // never invoked with any other operation
1991 }
1992 }
1993
1994 final GlobalConstants globalConstants = getGlobalConstants();
1995 if (globalConstants != null) {
1996 final GuardedInvocation cinv = globalConstants.findGetMethod(find, this, desc);
1997 if (cinv != null) {
1998 return cinv;
1999 }
2000 }
2001
2002 final Class<?> returnType = desc.getMethodType().returnType();
2003 final Property property = find.getProperty();
2004
2005 final int programPoint = NashornCallSiteDescriptor.isOptimistic(desc) ?
2006 NashornCallSiteDescriptor.getProgramPoint(desc) :
2007 UnwarrantedOptimismException.INVALID_PROGRAM_POINT;
2008
2009 mh = find.getGetter(returnType, programPoint, request);
2010 // Get the appropriate guard for this callsite and property.
2011 final MethodHandle guard = NashornGuards.getGuard(this, property, desc, explicitInstanceOfCheck);
2012 final ScriptObject owner = find.getOwner();
2013 final Class<ClassCastException> exception = explicitInstanceOfCheck ? null : ClassCastException.class;
2014
2015 final SwitchPoint protoSwitchPoint;
2016
2017 if (mh == null) {
2018 mh = Lookup.emptyGetter(returnType);
2019 protoSwitchPoint = getProtoSwitchPoint(name, owner);
2020 } else if (!find.isSelf()) {
2021 assert mh.type().returnType().equals(returnType) :
2022 "return type mismatch for getter " + mh.type().returnType() + " != " + returnType;
2023 if (!(property instanceof UserAccessorProperty)) {
2024 // Add a filter that replaces the self object with the prototype owning the property.
2025 mh = addProtoFilter(mh, find.getProtoChainLength());
2026 }
2027 protoSwitchPoint = getProtoSwitchPoint(name, owner);
2028 } else {
2029 protoSwitchPoint = null;
2030 }
2031
2032 final GuardedInvocation inv = new GuardedInvocation(mh, guard, protoSwitchPoint, exception);
2033 return inv.addSwitchPoint(findBuiltinSwitchPoint(name));
2034 }
2035
2036 private static GuardedInvocation findMegaMorphicGetMethod(final CallSiteDescriptor desc, final String name, final boolean isMethod) {
2037 Context.getContextTrusted().getLogger(ObjectClassGenerator.class).warning("Megamorphic getter: " + desc + " " + name + " " +isMethod);
2038 final MethodHandle invoker = MH.insertArguments(MEGAMORPHIC_GET, 1, name, isMethod);
2039 final MethodHandle guard = getScriptObjectGuard(desc.getMethodType(), true);
2040 return new GuardedInvocation(invoker, guard);
2041 }
2042
2043 @SuppressWarnings("unused")
2044 private Object megamorphicGet(final String key, final boolean isMethod) {
2045 final FindProperty find = findProperty(key, true);
2046 if (find != null) {
2047 return find.getObjectValue();
2048 }
2049
2050 return isMethod ? getNoSuchMethod(key, INVALID_PROGRAM_POINT) : invokeNoSuchProperty(key, INVALID_PROGRAM_POINT);
2051 }
2052
2053 // Marks a property as declared and sets its value. Used as slow path for block-scoped LET and CONST
2054 @SuppressWarnings("unused")
2055 private void declareAndSet(final String key, final Object value) {
2056 final PropertyMap oldMap = getMap();
2057 final FindProperty find = findProperty(key, false);
2058 assert find != null;
2059
2060 final Property property = find.getProperty();
2061 assert property != null;
2062 assert property.needsDeclaration();
2063
2064 final PropertyMap newMap = oldMap.replaceProperty(property, property.removeFlags(Property.NEEDS_DECLARATION));
2065 setMap(newMap);
2066 set(key, value, 0);
2067 }
2068
2069 /**
2070 * Find the appropriate GETINDEX method for an invoke dynamic call.
2071 *
2072 * @param desc the call site descriptor
2073 * @param request the link request
2074 *
2075 * @return GuardedInvocation to be invoked at call site.
2076 */
2077 protected GuardedInvocation findGetIndexMethod(final CallSiteDescriptor desc, final LinkRequest request) {
2078 final MethodType callType = desc.getMethodType();
2079 final Class<?> returnType = callType.returnType();
2080 final Class<?> returnClass = returnType.isPrimitive() ? returnType : Object.class;
2081 final Class<?> keyClass = callType.parameterType(1);
2082 final boolean explicitInstanceOfCheck = explicitInstanceOfCheck(desc, request);
2083
2084 final String name;
2085 if (returnClass.isPrimitive()) {
2086 //turn e.g. get with a double into getDouble
2087 final String returnTypeName = returnClass.getName();
2088 name = "get" + Character.toUpperCase(returnTypeName.charAt(0)) + returnTypeName.substring(1, returnTypeName.length());
2089 } else {
2090 name = "get";
2091 }
2092
2093 final MethodHandle mh = findGetIndexMethodHandle(returnClass, name, keyClass, desc);
2094 return new GuardedInvocation(mh, getScriptObjectGuard(callType, explicitInstanceOfCheck), (SwitchPoint)null, explicitInstanceOfCheck ? null : ClassCastException.class);
2095 }
2096
2097 private static MethodHandle getScriptObjectGuard(final MethodType type, final boolean explicitInstanceOfCheck) {
2098 return ScriptObject.class.isAssignableFrom(type.parameterType(0)) ? null : NashornGuards.getScriptObjectGuard(explicitInstanceOfCheck);
2099 }
2100
2101 /**
2102 * Find a handle for a getIndex method
2103 * @param returnType return type for getter
2104 * @param name name
2105 * @param elementType index type for getter
2106 * @param desc call site descriptor
2107 * @return method handle for getter
2108 */
2109 protected MethodHandle findGetIndexMethodHandle(final Class<?> returnType, final String name, final Class<?> elementType, final CallSiteDescriptor desc) {
2110 if (!returnType.isPrimitive()) {
2111 return findOwnMH_V(getClass(), name, returnType, elementType);
2112 }
2113
2114 return MH.insertArguments(
2115 findOwnMH_V(getClass(), name, returnType, elementType, int.class),
2116 2,
2117 NashornCallSiteDescriptor.isOptimistic(desc) ?
2118 NashornCallSiteDescriptor.getProgramPoint(desc) :
2119 INVALID_PROGRAM_POINT);
2120 }
2121
2122 /**
2123 * Get a switch point for a property with the given {@code name} that will be invalidated when
2124 * the property definition is changed in this object's prototype chain. Returns {@code null} if
2125 * the property is defined in this object itself.
2126 *
2127 * @param name the property name
2128 * @param owner the property owner, null if property is not defined
2129 * @return a SwitchPoint or null
2130 */
2131 public final SwitchPoint getProtoSwitchPoint(final String name, final ScriptObject owner) {
2132 if (owner == this || getProto() == null) {
2133 return null;
2134 }
2135
2136 for (ScriptObject obj = this; obj != owner && obj.getProto() != null; obj = obj.getProto()) {
2137 final ScriptObject parent = obj.getProto();
2138 parent.getMap().addListener(name, obj.getMap());
2139 }
2140
2141 return getMap().getSwitchPoint(name);
2142 }
2143
2144 /**
2145 * Find the appropriate SET method for an invoke dynamic call.
2146 *
2147 * @param desc the call site descriptor
2148 * @param request the link request
2149 *
2150 * @return GuardedInvocation to be invoked at call site.
2151 */
2152 protected GuardedInvocation findSetMethod(final CallSiteDescriptor desc, final LinkRequest request) {
2153 final String name = desc.getNameToken(CallSiteDescriptor.NAME_OPERAND);
2154
2155 if (request.isCallSiteUnstable() || hasWithScope()) {
2156 return findMegaMorphicSetMethod(desc, name);
2157 }
2158
2159 final boolean explicitInstanceOfCheck = explicitInstanceOfCheck(desc, request);
2160
2161 /*
2162 * If doing property set on a scope object, we should stop proto search on the first
2163 * non-scope object. Without this, for example, when assigning "toString" on global scope,
2164 * we'll end up assigning it on it's proto - which is Object.prototype.toString !!
2165 *
2166 * toString = function() { print("global toString"); } // don't affect Object.prototype.toString
2167 */
2168 FindProperty find = findProperty(name, true, this);
2169
2170 // If it's not a scope search, then we don't want any inherited properties except those with user defined accessors.
2171 if (find != null && find.isInherited() && !(find.getProperty() instanceof UserAccessorProperty)) {
2172 // We should still check if inherited data property is not writable
2173 if (isExtensible() && !find.getProperty().isWritable()) {
2174 return createEmptySetMethod(desc, explicitInstanceOfCheck, "property.not.writable", true);
2175 }
2176 // Otherwise, forget the found property unless this is a scope callsite and the owner is a scope object as well.
2177 if (!NashornCallSiteDescriptor.isScope(desc) || !find.getOwner().isScope()) {
2178 find = null;
2179 }
2180 }
2181
2182 if (find != null) {
2183 if (!find.getProperty().isWritable() && !NashornCallSiteDescriptor.isDeclaration(desc)) {
2184 if (NashornCallSiteDescriptor.isScope(desc) && find.getProperty().isLexicalBinding()) {
2185 throw typeError("assign.constant", name); // Overwriting ES6 const should throw also in non-strict mode.
2186 }
2187 // Existing, non-writable property
2188 return createEmptySetMethod(desc, explicitInstanceOfCheck, "property.not.writable", true);
2189 }
2190 } else {
2191 if (!isExtensible()) {
2192 return createEmptySetMethod(desc, explicitInstanceOfCheck, "object.non.extensible", false);
2193 }
2194 }
2195
2196 final GuardedInvocation inv = new SetMethodCreator(this, find, desc, request).createGuardedInvocation(findBuiltinSwitchPoint(name));
2197
2198 final GlobalConstants globalConstants = getGlobalConstants();
2199 if (globalConstants != null) {
2200 final GuardedInvocation cinv = globalConstants.findSetMethod(find, this, inv, desc, request);
2201 if (cinv != null) {
2202 return cinv;
2203 }
2204 }
2205
2206 return inv;
2207 }
2208
2209 private GlobalConstants getGlobalConstants() {
2210 // Avoid hitting getContext() which might be costly for a non-Global unless needed.
2211 return GlobalConstants.GLOBAL_ONLY && !isGlobal() ? null : getContext().getGlobalConstants();
2212 }
2213
2214 private GuardedInvocation createEmptySetMethod(final CallSiteDescriptor desc, final boolean explicitInstanceOfCheck, final String strictErrorMessage, final boolean canBeFastScope) {
2215 final String name = desc.getNameToken(CallSiteDescriptor.NAME_OPERAND);
2216 if (NashornCallSiteDescriptor.isStrict(desc)) {
2217 throw typeError(strictErrorMessage, name, ScriptRuntime.safeToString(this));
2218 }
2219 assert canBeFastScope || !NashornCallSiteDescriptor.isFastScope(desc);
2220 return new GuardedInvocation(
2221 Lookup.EMPTY_SETTER,
2222 NashornGuards.getMapGuard(getMap(), explicitInstanceOfCheck),
2223 getProtoSwitchPoint(name, null),
2224 explicitInstanceOfCheck ? null : ClassCastException.class);
2225 }
2226
2227 @SuppressWarnings("unused")
2228 private boolean extensionCheck(final boolean isStrict, final String name) {
2229 if (isExtensible()) {
2230 return true; //go on and do the set. this is our guard
2231 } else if (isStrict) {
2232 //throw an error for attempting to do the set in strict mode
2233 throw typeError("object.non.extensible", name, ScriptRuntime.safeToString(this));
2234 } else {
2235 //not extensible, non strict - this is a nop
2236 return false;
2237 }
2238 }
2239
2240 private GuardedInvocation findMegaMorphicSetMethod(final CallSiteDescriptor desc, final String name) {
2241 final MethodType type = desc.getMethodType().insertParameterTypes(1, Object.class);
2242 //never bother with ClassCastExceptionGuard for megamorphic callsites
2243 final GuardedInvocation inv = findSetIndexMethod(getClass(), desc, false, type);
2244 return inv.replaceMethods(MH.insertArguments(inv.getInvocation(), 1, name), inv.getGuard());
2245 }
2246
2247 @SuppressWarnings("unused")
2248 private static Object globalFilter(final Object object) {
2249 ScriptObject sobj = (ScriptObject) object;
2250 while (sobj != null && !(sobj instanceof Global)) {
2251 sobj = sobj.getProto();
2252 }
2253 return sobj;
2254 }
2255
2256 /**
2257 * Lookup function for the set index method, available for subclasses as well, e.g. {@link NativeArray}
2258 * provides special quick accessor linkage for continuous arrays that are represented as Java arrays
2259 *
2260 * @param desc call site descriptor
2261 * @param request link request
2262 *
2263 * @return GuardedInvocation to be invoked at call site.
2264 */
2265 protected GuardedInvocation findSetIndexMethod(final CallSiteDescriptor desc, final LinkRequest request) { // array, index, value
2266 return findSetIndexMethod(getClass(), desc, explicitInstanceOfCheck(desc, request), desc.getMethodType());
2267 }
2268
2269 /**
2270 * Find the appropriate SETINDEX method for an invoke dynamic call.
2271 *
2272 * @param clazz the receiver class
2273 * @param desc the call site descriptor
2274 * @param explicitInstanceOfCheck add an explicit instanceof check?
2275 * @param callType the method type at the call site
2276 *
2277 * @return GuardedInvocation to be invoked at call site.
2278 */
2279 private static GuardedInvocation findSetIndexMethod(final Class<? extends ScriptObject> clazz, final CallSiteDescriptor desc, final boolean explicitInstanceOfCheck, final MethodType callType) {
2280 assert callType.parameterCount() == 3;
2281 final Class<?> keyClass = callType.parameterType(1);
2282 final Class<?> valueClass = callType.parameterType(2);
2283
2284 MethodHandle methodHandle = findOwnMH_V(clazz, "set", void.class, keyClass, valueClass, int.class);
2285 methodHandle = MH.insertArguments(methodHandle, 3, NashornCallSiteDescriptor.getFlags(desc));
2286
2287 return new GuardedInvocation(methodHandle, getScriptObjectGuard(callType, explicitInstanceOfCheck), (SwitchPoint)null, explicitInstanceOfCheck ? null : ClassCastException.class);
2288 }
2289
2290 /**
2291 * Fall back if a function property is not found.
2292 * @param desc The call site descriptor
2293 * @param request the link request
2294 * @return GuardedInvocation to be invoked at call site.
2295 */
2296 public GuardedInvocation noSuchMethod(final CallSiteDescriptor desc, final LinkRequest request) {
2297 final String name = desc.getNameToken(2);
2298 final FindProperty find = findProperty(NO_SUCH_METHOD_NAME, true);
2299 final boolean scopeCall = isScope() && NashornCallSiteDescriptor.isScope(desc);
2300
2301 if (find == null) {
2302 return noSuchProperty(desc, request);
2303 }
2304
2305 final boolean explicitInstanceOfCheck = explicitInstanceOfCheck(desc, request);
2306
2307 final Object value = find.getObjectValue();
2308 if (!(value instanceof ScriptFunction)) {
2309 return createEmptyGetter(desc, explicitInstanceOfCheck, name);
2310 }
2311
2312 final ScriptFunction func = (ScriptFunction)value;
2313 final Object thiz = scopeCall && func.isStrict() ? UNDEFINED : this;
2314 // TODO: It'd be awesome if we could bind "name" without binding "this".
2315 // Since we're binding this we must use an identity guard here.
2316 return new GuardedInvocation(
2317 MH.dropArguments(
2318 MH.constant(
2319 ScriptFunction.class,
2320 func.createBound(thiz, new Object[] { name })),
2321 0,
2322 Object.class),
2323 NashornGuards.combineGuards(
2324 NashornGuards.getIdentityGuard(this),
2325 NashornGuards.getMapGuard(getMap(), true)));
2326 }
2327
2328 /**
2329 * Fall back if a property is not found.
2330 * @param desc the call site descriptor.
2331 * @param request the link request
2332 * @return GuardedInvocation to be invoked at call site.
2333 */
2334 public GuardedInvocation noSuchProperty(final CallSiteDescriptor desc, final LinkRequest request) {
2335 final String name = desc.getNameToken(CallSiteDescriptor.NAME_OPERAND);
2336 final FindProperty find = findProperty(NO_SUCH_PROPERTY_NAME, true);
2337 final boolean scopeAccess = isScope() && NashornCallSiteDescriptor.isScope(desc);
2338
2339 if (find != null) {
2340 final Object value = find.getObjectValue();
2341 ScriptFunction func = null;
2342 MethodHandle mh = null;
2343
2344 if (value instanceof ScriptFunction) {
2345 func = (ScriptFunction)value;
2346 mh = getCallMethodHandle(func, desc.getMethodType(), name);
2347 }
2348
2349 if (mh != null) {
2350 assert func != null;
2351 if (scopeAccess && func.isStrict()) {
2352 mh = bindTo(mh, UNDEFINED);
2353 }
2354
2355 return new GuardedInvocation(
2356 mh,
2357 find.isSelf()?
2358 getKnownFunctionPropertyGuardSelf(
2359 getMap(),
2360 find.getGetter(Object.class, INVALID_PROGRAM_POINT, request),
2361 func)
2362 :
2363 //TODO this always does a scriptobject check
2364 getKnownFunctionPropertyGuardProto(
2365 getMap(),
2366 find.getGetter(Object.class, INVALID_PROGRAM_POINT, request),
2367 find.getProtoChainLength(),
2368 func),
2369 getProtoSwitchPoint(NO_SUCH_PROPERTY_NAME, find.getOwner()),
2370 //TODO this doesn't need a ClassCastException as guard always checks script object
2371 null);
2372 }
2373 }
2374
2375 if (scopeAccess) {
2376 throw referenceError("not.defined", name);
2377 }
2378
2379 return createEmptyGetter(desc, explicitInstanceOfCheck(desc, request), name);
2380 }
2381
2382 /**
2383 * Invoke fall back if a property is not found.
2384 * @param name Name of property.
2385 * @param programPoint program point
2386 * @return Result from call.
2387 */
2388 protected Object invokeNoSuchProperty(final String name, final int programPoint) {
2389 final FindProperty find = findProperty(NO_SUCH_PROPERTY_NAME, true);
2390
2391 Object ret = UNDEFINED;
2392
2393 if (find != null) {
2394 final Object func = find.getObjectValue();
2395
2396 if (func instanceof ScriptFunction) {
2397 ret = ScriptRuntime.apply((ScriptFunction)func, this, name);
2398 }
2399 }
2400
2401 if (isValid(programPoint)) {
2402 throw new UnwarrantedOptimismException(ret, programPoint);
2403 }
2404
2405 return ret;
2406 }
2407
2408
2409 /**
2410 * Get __noSuchMethod__ as a function bound to this object and {@code name} if it is defined.
2411 * @param name the method name
2412 * @return the bound function, or undefined
2413 */
2414 private Object getNoSuchMethod(final String name, final int programPoint) {
2415 final FindProperty find = findProperty(NO_SUCH_METHOD_NAME, true);
2416
2417 if (find == null) {
2418 return invokeNoSuchProperty(name, programPoint);
2419 }
2420
2421 final Object value = find.getObjectValue();
2422 if (!(value instanceof ScriptFunction)) {
2423 return UNDEFINED;
2424 }
2425
2426 return ((ScriptFunction)value).createBound(this, new Object[] {name});
2427 }
2428
2429 private GuardedInvocation createEmptyGetter(final CallSiteDescriptor desc, final boolean explicitInstanceOfCheck, final String name) {
2430 if (NashornCallSiteDescriptor.isOptimistic(desc)) {
2431 throw new UnwarrantedOptimismException(UNDEFINED, NashornCallSiteDescriptor.getProgramPoint(desc), Type.OBJECT);
2432 }
2433
2434 return new GuardedInvocation(Lookup.emptyGetter(desc.getMethodType().returnType()),
2435 NashornGuards.getMapGuard(getMap(), explicitInstanceOfCheck), getProtoSwitchPoint(name, null),
2436 explicitInstanceOfCheck ? null : ClassCastException.class);
2437 }
2438
2439 private abstract static class ScriptObjectIterator <T extends Object> implements Iterator<T> {
2440 protected T[] values;
2441 protected final ScriptObject object;
2442 private int index;
2443
2444 ScriptObjectIterator(final ScriptObject object) {
2445 this.object = object;
2446 }
2447
2448 protected abstract void init();
2449
2450 @Override
2451 public boolean hasNext() {
2452 if (values == null) {
2453 init();
2454 }
2455 return index < values.length;
2456 }
2457
2458 @Override
2459 public T next() {
2460 if (values == null) {
2461 init();
2462 }
2463 return values[index++];
2464 }
2465
2466 @Override
2467 public void remove() {
2468 throw new UnsupportedOperationException("remove");
2469 }
2470 }
2471
2472 private static class KeyIterator extends ScriptObjectIterator<String> {
2473 KeyIterator(final ScriptObject object) {
2474 super(object);
2475 }
2476
2477 @Override
2478 protected void init() {
2479 final Set<String> keys = new LinkedHashSet<>();
2480 final Set<String> nonEnumerable = new HashSet<>();
2481 for (ScriptObject self = object; self != null; self = self.getProto()) {
2482 keys.addAll(Arrays.asList(self.getOwnKeys(false, nonEnumerable)));
2483 }
2484 this.values = keys.toArray(new String[keys.size()]);
2485 }
2486 }
2487
2488 private static class ValueIterator extends ScriptObjectIterator<Object> {
2489 ValueIterator(final ScriptObject object) {
2490 super(object);
2491 }
2492
2493 @Override
2494 protected void init() {
2495 final ArrayList<Object> valueList = new ArrayList<>();
2496 final Set<String> nonEnumerable = new HashSet<>();
2497 for (ScriptObject self = object; self != null; self = self.getProto()) {
2498 for (final String key : self.getOwnKeys(false, nonEnumerable)) {
2499 valueList.add(self.get(key));
2500 }
2501 }
2502 this.values = valueList.toArray(new Object[valueList.size()]);
2503 }
2504 }
2505
2506 /**
2507 * Add a spill property for the given key.
2508 * @param key Property key.
2509 * @param flags Property flags.
2510 * @return Added property.
2511 */
2512 private Property addSpillProperty(final String key, final int flags, final Object value, final boolean hasInitialValue) {
2513 final PropertyMap propertyMap = getMap();
2514 final int fieldSlot = propertyMap.getFreeFieldSlot();
2515 final int propertyFlags = flags | (useDualFields() ? Property.DUAL_FIELDS : 0);
2516
2517 Property property;
2518 if (fieldSlot > -1) {
2519 property = hasInitialValue ?
2520 new AccessorProperty(key, propertyFlags, fieldSlot, this, value) :
2521 new AccessorProperty(key, propertyFlags, getClass(), fieldSlot);
2522 property = addOwnProperty(property);
2523 } else {
2524 final int spillSlot = propertyMap.getFreeSpillSlot();
2525 property = hasInitialValue ?
2526 new SpillProperty(key, propertyFlags, spillSlot, this, value) :
2527 new SpillProperty(key, propertyFlags, spillSlot);
2528 property = addOwnProperty(property);
2529 ensureSpillSize(property.getSlot());
2530 }
2531 return property;
2532 }
2533
2534 /**
2535 * Add a spill entry for the given key.
2536 * @param key Property key.
2537 * @return Setter method handle.
2538 */
2539 MethodHandle addSpill(final Class<?> type, final String key) {
2540 return addSpillProperty(key, 0, null, false).getSetter(type, getMap());
2541 }
2542
2543 /**
2544 * Make sure arguments are paired correctly, with respect to more parameters than declared,
2545 * fewer parameters than declared and other things that JavaScript allows. This might involve
2546 * creating collectors.
2547 *
2548 * @param methodHandle method handle for invoke
2549 * @param callType type of the call
2550 *
2551 * @return method handle with adjusted arguments
2552 */
2553 protected static MethodHandle pairArguments(final MethodHandle methodHandle, final MethodType callType) {
2554 return pairArguments(methodHandle, callType, null);
2555 }
2556
2557 /**
2558 * Make sure arguments are paired correctly, with respect to more parameters than declared,
2559 * fewer parameters than declared and other things that JavaScript allows. This might involve
2560 * creating collectors.
2561 *
2562 * Make sure arguments are paired correctly.
2563 * @param methodHandle MethodHandle to adjust.
2564 * @param callType MethodType of the call site.
2565 * @param callerVarArg true if the caller is vararg, false otherwise, null if it should be inferred from the
2566 * {@code callType}; basically, if the last parameter type of the call site is an array, it'll be considered a
2567 * variable arity call site. These are ordinarily rare; Nashorn code generator creates variable arity call sites
2568 * when the call has more than {@link LinkerCallSite#ARGLIMIT} parameters.
2569 *
2570 * @return method handle with adjusted arguments
2571 */
2572 public static MethodHandle pairArguments(final MethodHandle methodHandle, final MethodType callType, final Boolean callerVarArg) {
2573 final MethodType methodType = methodHandle.type();
2574 if (methodType.equals(callType.changeReturnType(methodType.returnType()))) {
2575 return methodHandle;
2576 }
2577
2578 final int parameterCount = methodType.parameterCount();
2579 final int callCount = callType.parameterCount();
2580
2581 final boolean isCalleeVarArg = parameterCount > 0 && methodType.parameterType(parameterCount - 1).isArray();
2582 final boolean isCallerVarArg = callerVarArg != null ? callerVarArg : callCount > 0 &&
2583 callType.parameterType(callCount - 1).isArray();
2584
2585 if (isCalleeVarArg) {
2586 return isCallerVarArg ?
2587 methodHandle :
2588 MH.asCollector(methodHandle, Object[].class, callCount - parameterCount + 1);
2589 }
2590
2591 if (isCallerVarArg) {
2592 return adaptHandleToVarArgCallSite(methodHandle, callCount);
2593 }
2594
2595 if (callCount < parameterCount) {
2596 final int missingArgs = parameterCount - callCount;
2597 final Object[] fillers = new Object[missingArgs];
2598
2599 Arrays.fill(fillers, UNDEFINED);
2600
2601 if (isCalleeVarArg) {
2602 fillers[missingArgs - 1] = ScriptRuntime.EMPTY_ARRAY;
2603 }
2604
2605 return MH.insertArguments(
2606 methodHandle,
2607 parameterCount - missingArgs,
2608 fillers);
2609 }
2610
2611 if (callCount > parameterCount) {
2612 final int discardedArgs = callCount - parameterCount;
2613
2614 final Class<?>[] discards = new Class<?>[discardedArgs];
2615 Arrays.fill(discards, Object.class);
2616
2617 return MH.dropArguments(methodHandle, callCount - discardedArgs, discards);
2618 }
2619
2620 return methodHandle;
2621 }
2622
2623 static MethodHandle adaptHandleToVarArgCallSite(final MethodHandle mh, final int callSiteParamCount) {
2624 final int spreadArgs = mh.type().parameterCount() - callSiteParamCount + 1;
2625 return MH.filterArguments(
2626 MH.asSpreader(
2627 mh,
2628 Object[].class,
2629 spreadArgs),
2630 callSiteParamCount - 1,
2631 MH.insertArguments(
2632 TRUNCATINGFILTER,
2633 0,
2634 spreadArgs)
2635 );
2636 }
2637
2638 @SuppressWarnings("unused")
2639 private static Object[] truncatingFilter(final int n, final Object[] array) {
2640 final int length = array == null ? 0 : array.length;
2641 if (n == length) {
2642 return array == null ? ScriptRuntime.EMPTY_ARRAY : array;
2643 }
2644
2645 final Object[] newArray = new Object[n];
2646
2647 if (array != null) {
2648 System.arraycopy(array, 0, newArray, 0, Math.min(n, length));
2649 }
2650
2651 if (length < n) {
2652 final Object fill = UNDEFINED;
2653
2654 for (int i = length; i < n; i++) {
2655 newArray[i] = fill;
2656 }
2657 }
2658
2659 return newArray;
2660 }
2661
2662 /**
2663 * Numeric length setter for length property
2664 *
2665 * @param newLength new length to set
2666 */
2667 public final void setLength(final long newLength) {
2668 ArrayData data = getArray();
2669 final long arrayLength = data.length();
2670 if (newLength == arrayLength) {
2671 return;
2672 }
2673
2674 if (newLength > arrayLength) {
2675 data = data.ensure(newLength - 1);
2676 if (data.canDelete(arrayLength, newLength - 1, false)) {
2677 data = data.delete(arrayLength, newLength - 1);
2678 }
2679 setArray(data);
2680 return;
2681 }
2682
2683 if (newLength < arrayLength) {
2684 long actualLength = newLength;
2685
2686 // Check for numeric keys in property map and delete them or adjust length, depending on whether
2687 // they're defined as configurable. See ES5 #15.4.5.2
2688 if (getMap().containsArrayKeys()) {
2689
2690 for (long l = arrayLength - 1; l >= newLength; l--) {
2691 final FindProperty find = findProperty(JSType.toString(l), false);
2692
2693 if (find != null) {
2694
2695 if (find.getProperty().isConfigurable()) {
2696 deleteOwnProperty(find.getProperty());
2697 } else {
2698 actualLength = l + 1;
2699 break;
2700 }
2701 }
2702 }
2703 }
2704
2705 setArray(data.shrink(actualLength));
2706 data.setLength(actualLength);
2707 }
2708 }
2709
2710 private int getInt(final int index, final String key, final int programPoint) {
2711 if (isValidArrayIndex(index)) {
2712 for (ScriptObject object = this; ; ) {
2713 if (object.getMap().containsArrayKeys()) {
2714 final FindProperty find = object.findProperty(key, false, this);
2715
2716 if (find != null) {
2717 return getIntValue(find, programPoint);
2718 }
2719 }
2720
2721 if ((object = object.getProto()) == null) {
2722 break;
2723 }
2724
2725 final ArrayData array = object.getArray();
2726
2727 if (array.has(index)) {
2728 return isValid(programPoint) ?
2729 array.getIntOptimistic(index, programPoint) :
2730 array.getInt(index);
2731 }
2732 }
2733 } else {
2734 final FindProperty find = findProperty(key, true);
2735
2736 if (find != null) {
2737 return getIntValue(find, programPoint);
2738 }
2739 }
2740
2741 return JSType.toInt32(invokeNoSuchProperty(key, programPoint));
2742 }
2743
2744 @Override
2745 public int getInt(final Object key, final int programPoint) {
2746 final Object primitiveKey = JSType.toPrimitive(key, String.class);
2747 final int index = getArrayIndex(primitiveKey);
2748 final ArrayData array = getArray();
2749
2750 if (array.has(index)) {
2751 return isValid(programPoint) ? array.getIntOptimistic(index, programPoint) : array.getInt(index);
2752 }
2753
2754 return getInt(index, JSType.toString(primitiveKey), programPoint);
2755 }
2756
2757 @Override
2758 public int getInt(final double key, final int programPoint) {
2759 final int index = getArrayIndex(key);
2760 final ArrayData array = getArray();
2761
2762 if (array.has(index)) {
2763 return isValid(programPoint) ? array.getIntOptimistic(index, programPoint) : array.getInt(index);
2764 }
2765
2766 return getInt(index, JSType.toString(key), programPoint);
2767 }
2768
2769 @Override
2770 public int getInt(final long key, final int programPoint) {
2771 final int index = getArrayIndex(key);
2772 final ArrayData array = getArray();
2773
2774 if (array.has(index)) {
2775 return isValid(programPoint) ? array.getIntOptimistic(index, programPoint) : array.getInt(index);
2776 }
2777
2778 return getInt(index, JSType.toString(key), programPoint);
2779 }
2780
2781 @Override
2782 public int getInt(final int key, final int programPoint) {
2783 final int index = getArrayIndex(key);
2784 final ArrayData array = getArray();
2785
2786 if (array.has(index)) {
2787 return isValid(programPoint) ? array.getIntOptimistic(key, programPoint) : array.getInt(key);
2788 }
2789
2790 return getInt(index, JSType.toString(key), programPoint);
2791 }
2792
2793 private long getLong(final int index, final String key, final int programPoint) {
2794 if (isValidArrayIndex(index)) {
2795 for (ScriptObject object = this; ; ) {
2796 if (object.getMap().containsArrayKeys()) {
2797 final FindProperty find = object.findProperty(key, false, this);
2798 if (find != null) {
2799 return getLongValue(find, programPoint);
2800 }
2801 }
2802
2803 if ((object = object.getProto()) == null) {
2804 break;
2805 }
2806
2807 final ArrayData array = object.getArray();
2808
2809 if (array.has(index)) {
2810 return isValid(programPoint) ?
2811 array.getLongOptimistic(index, programPoint) :
2812 array.getLong(index);
2813 }
2814 }
2815 } else {
2816 final FindProperty find = findProperty(key, true);
2817
2818 if (find != null) {
2819 return getLongValue(find, programPoint);
2820 }
2821 }
2822
2823 return JSType.toLong(invokeNoSuchProperty(key, programPoint));
2824 }
2825
2826 @Override
2827 public long getLong(final Object key, final int programPoint) {
2828 final Object primitiveKey = JSType.toPrimitive(key, String.class);
2829 final int index = getArrayIndex(primitiveKey);
2830 final ArrayData array = getArray();
2831
2832 if (array.has(index)) {
2833 return isValid(programPoint) ? array.getLongOptimistic(index, programPoint) : array.getLong(index);
2834 }
2835
2836 return getLong(index, JSType.toString(primitiveKey), programPoint);
2837 }
2838
2839 @Override
2840 public long getLong(final double key, final int programPoint) {
2841 final int index = getArrayIndex(key);
2842 final ArrayData array = getArray();
2843
2844 if (array.has(index)) {
2845 return isValid(programPoint) ? array.getLongOptimistic(index, programPoint) : array.getLong(index);
2846 }
2847
2848 return getLong(index, JSType.toString(key), programPoint);
2849 }
2850
2851 @Override
2852 public long getLong(final long key, final int programPoint) {
2853 final int index = getArrayIndex(key);
2854 final ArrayData array = getArray();
2855
2856 if (array.has(index)) {
2857 return isValid(programPoint) ? array.getLongOptimistic(index, programPoint) : array.getLong(index);
2858 }
2859
2860 return getLong(index, JSType.toString(key), programPoint);
2861 }
2862
2863 @Override
2864 public long getLong(final int key, final int programPoint) {
2865 final int index = getArrayIndex(key);
2866 final ArrayData array = getArray();
2867
2868 if (array.has(index)) {
2869 return isValid(programPoint) ? array.getLongOptimistic(key, programPoint) : array.getLong(key);
2870 }
2871
2872 return getLong(index, JSType.toString(key), programPoint);
2873 }
2874
2875 private double getDouble(final int index, final String key, final int programPoint) {
2876 if (isValidArrayIndex(index)) {
2877 for (ScriptObject object = this; ; ) {
2878 if (object.getMap().containsArrayKeys()) {
2879 final FindProperty find = object.findProperty(key, false, this);
2880 if (find != null) {
2881 return getDoubleValue(find, programPoint);
2882 }
2883 }
2884
2885 if ((object = object.getProto()) == null) {
2886 break;
2887 }
2888
2889 final ArrayData array = object.getArray();
2890
2891 if (array.has(index)) {
2892 return isValid(programPoint) ?
2893 array.getDoubleOptimistic(index, programPoint) :
2894 array.getDouble(index);
2895 }
2896 }
2897 } else {
2898 final FindProperty find = findProperty(key, true);
2899
2900 if (find != null) {
2901 return getDoubleValue(find, programPoint);
2902 }
2903 }
2904
2905 return JSType.toNumber(invokeNoSuchProperty(key, INVALID_PROGRAM_POINT));
2906 }
2907
2908 @Override
2909 public double getDouble(final Object key, final int programPoint) {
2910 final Object primitiveKey = JSType.toPrimitive(key, String.class);
2911 final int index = getArrayIndex(primitiveKey);
2912 final ArrayData array = getArray();
2913
2914 if (array.has(index)) {
2915 return isValid(programPoint) ? array.getDoubleOptimistic(index, programPoint) : array.getDouble(index);
2916 }
2917
2918 return getDouble(index, JSType.toString(primitiveKey), programPoint);
2919 }
2920
2921 @Override
2922 public double getDouble(final double key, final int programPoint) {
2923 final int index = getArrayIndex(key);
2924 final ArrayData array = getArray();
2925
2926 if (array.has(index)) {
2927 return isValid(programPoint) ? array.getDoubleOptimistic(index, programPoint) : array.getDouble(index);
2928 }
2929
2930 return getDouble(index, JSType.toString(key), programPoint);
2931 }
2932
2933 @Override
2934 public double getDouble(final long key, final int programPoint) {
2935 final int index = getArrayIndex(key);
2936 final ArrayData array = getArray();
2937
2938 if (array.has(index)) {
2939 return isValid(programPoint) ? array.getDoubleOptimistic(index, programPoint) : array.getDouble(index);
2940 }
2941
2942 return getDouble(index, JSType.toString(key), programPoint);
2943 }
2944
2945 @Override
2946 public double getDouble(final int key, final int programPoint) {
2947 final int index = getArrayIndex(key);
2948 final ArrayData array = getArray();
2949
2950 if (array.has(index)) {
2951 return isValid(programPoint) ? array.getDoubleOptimistic(key, programPoint) : array.getDouble(key);
2952 }
2953
2954 return getDouble(index, JSType.toString(key), programPoint);
2955 }
2956
2957 private Object get(final int index, final String key) {
2958 if (isValidArrayIndex(index)) {
2959 for (ScriptObject object = this; ; ) {
2960 if (object.getMap().containsArrayKeys()) {
2961 final FindProperty find = object.findProperty(key, false, this);
2962
2963 if (find != null) {
2964 return find.getObjectValue();
2965 }
2966 }
2967
2968 if ((object = object.getProto()) == null) {
2969 break;
2970 }
2971
2972 final ArrayData array = object.getArray();
2973
2974 if (array.has(index)) {
2975 return array.getObject(index);
2976 }
2977 }
2978 } else {
2979 final FindProperty find = findProperty(key, true);
2980
2981 if (find != null) {
2982 return find.getObjectValue();
2983 }
2984 }
2985
2986 return invokeNoSuchProperty(key, INVALID_PROGRAM_POINT);
2987 }
2988
2989 @Override
2990 public Object get(final Object key) {
2991 final Object primitiveKey = JSType.toPrimitive(key, String.class);
2992 final int index = getArrayIndex(primitiveKey);
2993 final ArrayData array = getArray();
2994
2995 if (array.has(index)) {
2996 return array.getObject(index);
2997 }
2998
2999 return get(index, JSType.toString(primitiveKey));
3000 }
3001
3002 @Override
3003 public Object get(final double key) {
3004 final int index = getArrayIndex(key);
3005 final ArrayData array = getArray();
3006
3007 if (array.has(index)) {
3008 return array.getObject(index);
3009 }
3010
3011 return get(index, JSType.toString(key));
3012 }
3013
3014 @Override
3015 public Object get(final long key) {
3016 final int index = getArrayIndex(key);
3017 final ArrayData array = getArray();
3018
3019 if (array.has(index)) {
3020 return array.getObject(index);
3021 }
3022
3023 return get(index, JSType.toString(key));
3024 }
3025
3026 @Override
3027 public Object get(final int key) {
3028 final int index = getArrayIndex(key);
3029 final ArrayData array = getArray();
3030
3031 if (array.has(index)) {
3032 return array.getObject(index);
3033 }
3034
3035 return get(index, JSType.toString(key));
3036 }
3037
3038 private boolean doesNotHaveCheckArrayKeys(final long longIndex, final int value, final int callSiteFlags) {
3039 if (getMap().containsArrayKeys()) {
3040 final String key = JSType.toString(longIndex);
3041 final FindProperty find = findProperty(key, true);
3042 if (find != null) {
3043 setObject(find, callSiteFlags, key, value);
3044 return true;
3045 }
3046 }
3047 return false;
3048 }
3049
3050 private boolean doesNotHaveCheckArrayKeys(final long longIndex, final long value, final int callSiteFlags) {
3051 if (getMap().containsArrayKeys()) {
3052 final String key = JSType.toString(longIndex);
3053 final FindProperty find = findProperty(key, true);
3054 if (find != null) {
3055 setObject(find, callSiteFlags, key, value);
3056 return true;
3057 }
3058 }
3059 return false;
3060 }
3061
3062 private boolean doesNotHaveCheckArrayKeys(final long longIndex, final double value, final int callSiteFlags) {
3063 if (getMap().containsArrayKeys()) {
3064 final String key = JSType.toString(longIndex);
3065 final FindProperty find = findProperty(key, true);
3066 if (find != null) {
3067 setObject(find, callSiteFlags, key, value);
3068 return true;
3069 }
3070 }
3071 return false;
3072 }
3073
3074 private boolean doesNotHaveCheckArrayKeys(final long longIndex, final Object value, final int callSiteFlags) {
3075 if (getMap().containsArrayKeys()) {
3076 final String key = JSType.toString(longIndex);
3077 final FindProperty find = findProperty(key, true);
3078 if (find != null) {
3079 setObject(find, callSiteFlags, key, value);
3080 return true;
3081 }
3082 }
3083 return false;
3084 }
3085
3086 //value agnostic
3087 private boolean doesNotHaveEnsureLength(final long longIndex, final long oldLength, final int callSiteFlags) {
3088 if (longIndex >= oldLength) {
3089 if (!isExtensible()) {
3090 if (isStrictFlag(callSiteFlags)) {
3091 throw typeError("object.non.extensible", JSType.toString(longIndex), ScriptRuntime.safeToString(this));
3092 }
3093 return true;
3094 }
3095 setArray(getArray().ensure(longIndex));
3096 }
3097 return false;
3098 }
3099
3100 private void doesNotHaveEnsureDelete(final long longIndex, final long oldLength, final boolean strict) {
3101 if (longIndex > oldLength) {
3102 ArrayData array = getArray();
3103 if (array.canDelete(oldLength, longIndex - 1, strict)) {
3104 array = array.delete(oldLength, longIndex - 1);
3105 }
3106 setArray(array);
3107 }
3108 }
3109
3110 private void doesNotHave(final int index, final int value, final int callSiteFlags) {
3111 final long oldLength = getArray().length();
3112 final long longIndex = ArrayIndex.toLongIndex(index);
3113 if (!doesNotHaveCheckArrayKeys(longIndex, value, callSiteFlags) && !doesNotHaveEnsureLength(longIndex, oldLength, callSiteFlags)) {
3114 final boolean strict = isStrictFlag(callSiteFlags);
3115 setArray(getArray().set(index, value, strict));
3116 doesNotHaveEnsureDelete(longIndex, oldLength, strict);
3117 }
3118 }
3119
3120 private void doesNotHave(final int index, final long value, final int callSiteFlags) {
3121 final long oldLength = getArray().length();
3122 final long longIndex = ArrayIndex.toLongIndex(index);
3123 if (!doesNotHaveCheckArrayKeys(longIndex, value, callSiteFlags) && !doesNotHaveEnsureLength(longIndex, oldLength, callSiteFlags)) {
3124 final boolean strict = isStrictFlag(callSiteFlags);
3125 setArray(getArray().set(index, value, strict));
3126 doesNotHaveEnsureDelete(longIndex, oldLength, strict);
3127 }
3128 }
3129
3130 private void doesNotHave(final int index, final double value, final int callSiteFlags) {
3131 final long oldLength = getArray().length();
3132 final long longIndex = ArrayIndex.toLongIndex(index);
3133 if (!doesNotHaveCheckArrayKeys(longIndex, value, callSiteFlags) && !doesNotHaveEnsureLength(longIndex, oldLength, callSiteFlags)) {
3134 final boolean strict = isStrictFlag(callSiteFlags);
3135 setArray(getArray().set(index, value, strict));
3136 doesNotHaveEnsureDelete(longIndex, oldLength, strict);
3137 }
3138 }
3139
3140 private void doesNotHave(final int index, final Object value, final int callSiteFlags) {
3141 final long oldLength = getArray().length();
3142 final long longIndex = ArrayIndex.toLongIndex(index);
3143 if (!doesNotHaveCheckArrayKeys(longIndex, value, callSiteFlags) && !doesNotHaveEnsureLength(longIndex, oldLength, callSiteFlags)) {
3144 final boolean strict = isStrictFlag(callSiteFlags);
3145 setArray(getArray().set(index, value, strict));
3146 doesNotHaveEnsureDelete(longIndex, oldLength, strict);
3147 }
3148 }
3149
3150 /**
3151 * This is the most generic of all Object setters. Most of the others use this in some form.
3152 * TODO: should be further specialized
3153 *
3154 * @param find found property
3155 * @param callSiteFlags callsite flags
3156 * @param key property key
3157 * @param value property value
3158 */
3159 public final void setObject(final FindProperty find, final int callSiteFlags, final String key, final Object value) {
3160 FindProperty f = find;
3161
3162 invalidateGlobalConstant(key);
3163
3164 if (f != null && f.isInherited() && !(f.getProperty() instanceof UserAccessorProperty)) {
3165 final boolean isScope = isScopeFlag(callSiteFlags);
3166 // If the start object of the find is not this object it means the property was found inside a
3167 // 'with' statement expression (see WithObject.findProperty()). In this case we forward the 'set'
3168 // to the 'with' object.
3169 // Note that although a 'set' operation involving a with statement follows scope rules outside
3170 // the 'with' expression (the 'set' operation is performed on the owning prototype if it exists),
3171 // it follows non-scope rules inside the 'with' expression (set is performed on the top level object).
3172 // This is why we clear the callsite flags and FindProperty in the forward call to the 'with' object.
3173 if (isScope && f.getSelf() != this) {
3174 f.getSelf().setObject(null, 0, key, value);
3175 return;
3176 }
3177 // Setting a property should not modify the property in prototype unless this is a scope callsite
3178 // and the owner is a scope object as well (with the exception of 'with' statement handled above).
3179 if (!isScope || !f.getOwner().isScope()) {
3180 f = null;
3181 }
3182 }
3183
3184 if (f != null) {
3185 if (!f.getProperty().isWritable()) {
3186 if (isScopeFlag(callSiteFlags) && f.getProperty().isLexicalBinding()) {
3187 throw typeError("assign.constant", key); // Overwriting ES6 const should throw also in non-strict mode.
3188 }
3189 if (isStrictFlag(callSiteFlags)) {
3190 throw typeError("property.not.writable", key, ScriptRuntime.safeToString(this));
3191 }
3192 return;
3193 }
3194
3195 f.setValue(value, isStrictFlag(callSiteFlags));
3196
3197 } else if (!isExtensible()) {
3198 if (isStrictFlag(callSiteFlags)) {
3199 throw typeError("object.non.extensible", key, ScriptRuntime.safeToString(this));
3200 }
3201 } else {
3202 ScriptObject sobj = this;
3203 // undefined scope properties are set in the global object.
3204 if (isScope()) {
3205 while (sobj != null && !(sobj instanceof Global)) {
3206 sobj = sobj.getProto();
3207 }
3208 assert sobj != null : "no parent global object in scope";
3209 }
3210 //this will unbox any Number object to its primitive type in case the
3211 //property supports primitive types, so it doesn't matter that it comes
3212 //in as an Object.
3213 sobj.addSpillProperty(key, 0, value, true);
3214 }
3215 }
3216
3217 @Override
3218 public void set(final Object key, final int value, final int callSiteFlags) {
3219 final Object primitiveKey = JSType.toPrimitive(key, String.class);
3220 final int index = getArrayIndex(primitiveKey);
3221
3222 if (isValidArrayIndex(index)) {
3223 final ArrayData data = getArray();
3224 if (data.has(index)) {
3225 setArray(data.set(index, value, isStrictFlag(callSiteFlags)));
3226 } else {
3227 doesNotHave(index, value, callSiteFlags);
3228 }
3229
3230 return;
3231 }
3232
3233 final String propName = JSType.toString(primitiveKey);
3234 setObject(findProperty(propName, true), callSiteFlags, propName, JSType.toObject(value));
3235 }
3236
3237 @Override
3238 public void set(final Object key, final long value, final int callSiteFlags) {
3239 final Object primitiveKey = JSType.toPrimitive(key, String.class);
3240 final int index = getArrayIndex(primitiveKey);
3241
3242 if (isValidArrayIndex(index)) {
3243 final ArrayData data = getArray();
3244 if (data.has(index)) {
3245 setArray(data.set(index, value, isStrictFlag(callSiteFlags)));
3246 } else {
3247 doesNotHave(index, value, callSiteFlags);
3248 }
3249
3250 return;
3251 }
3252
3253 final String propName = JSType.toString(primitiveKey);
3254 setObject(findProperty(propName, true), callSiteFlags, propName, JSType.toObject(value));
3255 }
3256
3257 @Override
3258 public void set(final Object key, final double value, final int callSiteFlags) {
3259 final Object primitiveKey = JSType.toPrimitive(key, String.class);
3260 final int index = getArrayIndex(primitiveKey);
3261
3262 if (isValidArrayIndex(index)) {
3263 final ArrayData data = getArray();
3264 if (data.has(index)) {
3265 setArray(data.set(index, value, isStrictFlag(callSiteFlags)));
3266 } else {
3267 doesNotHave(index, value, callSiteFlags);
3268 }
3269
3270 return;
3271 }
3272
3273 final String propName = JSType.toString(primitiveKey);
3274 setObject(findProperty(propName, true), callSiteFlags, propName, JSType.toObject(value));
3275 }
3276
3277 @Override
3278 public void set(final Object key, final Object value, final int callSiteFlags) {
3279 final Object primitiveKey = JSType.toPrimitive(key, String.class);
3280 final int index = getArrayIndex(primitiveKey);
3281
3282 if (isValidArrayIndex(index)) {
3283 final ArrayData data = getArray();
3284 if (data.has(index)) {
3285 setArray(data.set(index, value, isStrictFlag(callSiteFlags)));
3286 } else {
3287 doesNotHave(index, value, callSiteFlags);
3288 }
3289
3290 return;
3291 }
3292
3293 final String propName = JSType.toString(primitiveKey);
3294 setObject(findProperty(propName, true), callSiteFlags, propName, value);
3295 }
3296
3297 @Override
3298 public void set(final double key, final int value, final int callSiteFlags) {
3299 final int index = getArrayIndex(key);
3300
3301 if (isValidArrayIndex(index)) {
3302 final ArrayData data = getArray();
3303 if (data.has(index)) {
3304 setArray(data.set(index, value, isStrictFlag(callSiteFlags)));
3305 } else {
3306 doesNotHave(index, value, callSiteFlags);
3307 }
3308
3309 return;
3310 }
3311
3312 final String propName = JSType.toString(key);
3313 setObject(findProperty(propName, true), callSiteFlags, propName, JSType.toObject(value));
3314 }
3315
3316 @Override
3317 public void set(final double key, final long value, final int callSiteFlags) {
3318 final int index = getArrayIndex(key);
3319
3320 if (isValidArrayIndex(index)) {
3321 final ArrayData data = getArray();
3322 if (data.has(index)) {
3323 setArray(data.set(index, value, isStrictFlag(callSiteFlags)));
3324 } else {
3325 doesNotHave(index, value, callSiteFlags);
3326 }
3327
3328 return;
3329 }
3330
3331 final String propName = JSType.toString(key);
3332 setObject(findProperty(propName, true), callSiteFlags, propName, JSType.toObject(value));
3333 }
3334
3335 @Override
3336 public void set(final double key, final double value, final int callSiteFlags) {
3337 final int index = getArrayIndex(key);
3338
3339 if (isValidArrayIndex(index)) {
3340 final ArrayData data = getArray();
3341 if (data.has(index)) {
3342 setArray(data.set(index, value, isStrictFlag(callSiteFlags)));
3343 } else {
3344 doesNotHave(index, value, callSiteFlags);
3345 }
3346
3347 return;
3348 }
3349
3350 final String propName = JSType.toString(key);
3351 setObject(findProperty(propName, true), callSiteFlags, propName, JSType.toObject(value));
3352 }
3353
3354 @Override
3355 public void set(final double key, final Object value, final int callSiteFlags) {
3356 final int index = getArrayIndex(key);
3357
3358 if (isValidArrayIndex(index)) {
3359 final ArrayData data = getArray();
3360 if (data.has(index)) {
3361 setArray(data.set(index, value, isStrictFlag(callSiteFlags)));
3362 } else {
3363 doesNotHave(index, value, callSiteFlags);
3364 }
3365
3366 return;
3367 }
3368
3369 final String propName = JSType.toString(key);
3370 setObject(findProperty(propName, true), callSiteFlags, propName, value);
3371 }
3372
3373 @Override
3374 public void set(final long key, final int value, final int callSiteFlags) {
3375 final int index = getArrayIndex(key);
3376
3377 if (isValidArrayIndex(index)) {
3378 final ArrayData data = getArray();
3379 if (data.has(index)) {
3380 setArray(data.set(index, value, isStrictFlag(callSiteFlags)));
3381 } else {
3382 doesNotHave(index, value, callSiteFlags);
3383 }
3384
3385 return;
3386 }
3387
3388 final String propName = JSType.toString(key);
3389 setObject(findProperty(propName, true), callSiteFlags, propName, JSType.toObject(value));
3390 }
3391
3392 @Override
3393 public void set(final long key, final long value, final int callSiteFlags) {
3394 final int index = getArrayIndex(key);
3395
3396 if (isValidArrayIndex(index)) {
3397 final ArrayData data = getArray();
3398 if (data.has(index)) {
3399 setArray(data.set(index, value, isStrictFlag(callSiteFlags)));
3400 } else {
3401 doesNotHave(index, value, callSiteFlags);
3402 }
3403
3404 return;
3405 }
3406
3407 final String propName = JSType.toString(key);
3408 setObject(findProperty(propName, true), callSiteFlags, propName, JSType.toObject(value));
3409 }
3410
3411 @Override
3412 public void set(final long key, final double value, final int callSiteFlags) {
3413 final int index = getArrayIndex(key);
3414
3415 if (isValidArrayIndex(index)) {
3416 final ArrayData data = getArray();
3417 if (data.has(index)) {
3418 setArray(data.set(index, value, isStrictFlag(callSiteFlags)));
3419 } else {
3420 doesNotHave(index, value, callSiteFlags);
3421 }
3422
3423 return;
3424 }
3425
3426 final String propName = JSType.toString(key);
3427 setObject(findProperty(propName, true), callSiteFlags, propName, JSType.toObject(value));
3428 }
3429
3430 @Override
3431 public void set(final long key, final Object value, final int callSiteFlags) {
3432 final int index = getArrayIndex(key);
3433
3434 if (isValidArrayIndex(index)) {
3435 final ArrayData data = getArray();
3436 if (data.has(index)) {
3437 setArray(data.set(index, value, isStrictFlag(callSiteFlags)));
3438 } else {
3439 doesNotHave(index, value, callSiteFlags);
3440 }
3441
3442 return;
3443 }
3444
3445 final String propName = JSType.toString(key);
3446 setObject(findProperty(propName, true), callSiteFlags, propName, value);
3447 }
3448
3449 @Override
3450 public void set(final int key, final int value, final int callSiteFlags) {
3451 final int index = getArrayIndex(key);
3452 if (isValidArrayIndex(index)) {
3453 if (getArray().has(index)) {
3454 final ArrayData data = getArray();
3455 setArray(data.set(index, value, isStrictFlag(callSiteFlags)));
3456 } else {
3457 doesNotHave(index, value, callSiteFlags);
3458 }
3459 return;
3460 }
3461
3462 final String propName = JSType.toString(key);
3463 setObject(findProperty(propName, true), callSiteFlags, propName, JSType.toObject(value));
3464 }
3465
3466 @Override
3467 public void set(final int key, final long value, final int callSiteFlags) {
3468 final int index = getArrayIndex(key);
3469
3470 if (isValidArrayIndex(index)) {
3471 final ArrayData data = getArray();
3472 if (data.has(index)) {
3473 setArray(data.set(index, value, isStrictFlag(callSiteFlags)));
3474 } else {
3475 doesNotHave(index, value, callSiteFlags);
3476 }
3477
3478 return;
3479 }
3480
3481 final String propName = JSType.toString(key);
3482 setObject(findProperty(propName, true), callSiteFlags, propName, JSType.toObject(value));
3483 }
3484
3485 @Override
3486 public void set(final int key, final double value, final int callSiteFlags) {
3487 final int index = getArrayIndex(key);
3488
3489 if (isValidArrayIndex(index)) {
3490 final ArrayData data = getArray();
3491 if (data.has(index)) {
3492 setArray(data.set(index, value, isStrictFlag(callSiteFlags)));
3493 } else {
3494 doesNotHave(index, value, callSiteFlags);
3495 }
3496
3497 return;
3498 }
3499
3500 final String propName = JSType.toString(key);
3501 setObject(findProperty(propName, true), callSiteFlags, propName, JSType.toObject(value));
3502 }
3503
3504 @Override
3505 public void set(final int key, final Object value, final int callSiteFlags) {
3506 final int index = getArrayIndex(key);
3507
3508 if (isValidArrayIndex(index)) {
3509 final ArrayData data = getArray();
3510 if (data.has(index)) {
3511 setArray(data.set(index, value, isStrictFlag(callSiteFlags)));
3512 } else {
3513 doesNotHave(index, value, callSiteFlags);
3514 }
3515
3516 return;
3517 }
3518
3519 final String propName = JSType.toString(key);
3520 setObject(findProperty(propName, true), callSiteFlags, propName, value);
3521 }
3522
3523 @Override
3524 public boolean has(final Object key) {
3525 final Object primitiveKey = JSType.toPrimitive(key);
3526 final int index = getArrayIndex(primitiveKey);
3527 return isValidArrayIndex(index) ? hasArrayProperty(index) : hasProperty(JSType.toString(primitiveKey), true);
3528 }
3529
3530 @Override
3531 public boolean has(final double key) {
3532 final int index = getArrayIndex(key);
3533 return isValidArrayIndex(index) ? hasArrayProperty(index) : hasProperty(JSType.toString(key), true);
3534 }
3535
3536 @Override
3537 public boolean has(final long key) {
3538 final int index = getArrayIndex(key);
3539 return isValidArrayIndex(index) ? hasArrayProperty(index) : hasProperty(JSType.toString(key), true);
3540 }
3541
3542 @Override
3543 public boolean has(final int key) {
3544 final int index = getArrayIndex(key);
3545 return isValidArrayIndex(index) ? hasArrayProperty(index) : hasProperty(JSType.toString(key), true);
3546 }
3547
3548 private boolean hasArrayProperty(final int index) {
3549 boolean hasArrayKeys = false;
3550
3551 for (ScriptObject self = this; self != null; self = self.getProto()) {
3552 if (self.getArray().has(index)) {
3553 return true;
3554 }
3555 hasArrayKeys = hasArrayKeys || self.getMap().containsArrayKeys();
3556 }
3557
3558 return hasArrayKeys && hasProperty(ArrayIndex.toKey(index), true);
3559 }
3560
3561 @Override
3562 public boolean hasOwnProperty(final Object key) {
3563 final Object primitiveKey = JSType.toPrimitive(key, String.class);
3564 final int index = getArrayIndex(primitiveKey);
3565 return isValidArrayIndex(index) ? hasOwnArrayProperty(index) : hasProperty(JSType.toString(primitiveKey), false);
3566 }
3567
3568 @Override
3569 public boolean hasOwnProperty(final int key) {
3570 final int index = getArrayIndex(key);
3571 return isValidArrayIndex(index) ? hasOwnArrayProperty(index) : hasProperty(JSType.toString(key), false);
3572 }
3573
3574 @Override
3575 public boolean hasOwnProperty(final long key) {
3576 final int index = getArrayIndex(key);
3577 return isValidArrayIndex(index) ? hasOwnArrayProperty(index) : hasProperty(JSType.toString(key), false);
3578 }
3579
3580 @Override
3581 public boolean hasOwnProperty(final double key) {
3582 final int index = getArrayIndex(key);
3583 return isValidArrayIndex(index) ? hasOwnArrayProperty(index) : hasProperty(JSType.toString(key), false);
3584 }
3585
3586 private boolean hasOwnArrayProperty(final int index) {
3587 return getArray().has(index) || getMap().containsArrayKeys() && hasProperty(ArrayIndex.toKey(index), false);
3588 }
3589
3590 @Override
3591 public boolean delete(final int key, final boolean strict) {
3592 final int index = getArrayIndex(key);
3593 final ArrayData array = getArray();
3594
3595 if (array.has(index)) {
3596 if (array.canDelete(index, strict)) {
3597 setArray(array.delete(index));
3598 return true;
3599 }
3600 return false;
3601 }
3602 return deleteObject(JSType.toObject(key), strict);
3603 }
3604
3605 @Override
3606 public boolean delete(final long key, final boolean strict) {
3607 final int index = getArrayIndex(key);
3608 final ArrayData array = getArray();
3609
3610 if (array.has(index)) {
3611 if (array.canDelete(index, strict)) {
3612 setArray(array.delete(index));
3613 return true;
3614 }
3615 return false;
3616 }
3617
3618 return deleteObject(JSType.toObject(key), strict);
3619 }
3620
3621 @Override
3622 public boolean delete(final double key, final boolean strict) {
3623 final int index = getArrayIndex(key);
3624 final ArrayData array = getArray();
3625
3626 if (array.has(index)) {
3627 if (array.canDelete(index, strict)) {
3628 setArray(array.delete(index));
3629 return true;
3630 }
3631 return false;
3632 }
3633
3634 return deleteObject(JSType.toObject(key), strict);
3635 }
3636
3637 @Override
3638 public boolean delete(final Object key, final boolean strict) {
3639 final Object primitiveKey = JSType.toPrimitive(key, String.class);
3640 final int index = getArrayIndex(primitiveKey);
3641 final ArrayData array = getArray();
3642
3643 if (array.has(index)) {
3644 if (array.canDelete(index, strict)) {
3645 setArray(array.delete(index));
3646 return true;
3647 }
3648 return false;
3649 }
3650
3651 return deleteObject(primitiveKey, strict);
3652 }
3653
3654 private boolean deleteObject(final Object key, final boolean strict) {
3655 final String propName = JSType.toString(key);
3656 final FindProperty find = findProperty(propName, false);
3657
3658 if (find == null) {
3659 return true;
3660 }
3661
3662 if (!find.getProperty().isConfigurable()) {
3663 if (strict) {
3664 throw typeError("cant.delete.property", propName, ScriptRuntime.safeToString(this));
3665 }
3666 return false;
3667 }
3668
3669 final Property prop = find.getProperty();
3670 deleteOwnProperty(prop);
3671
3672 return true;
3673 }
3674
3675 /**
3676 * Return a shallow copy of this ScriptObject.
3677 * @return a shallow copy.
3678 */
3679 public final ScriptObject copy() {
3680 try {
3681 return clone();
3682 } catch (final CloneNotSupportedException e) {
3683 throw new RuntimeException(e);
3684 }
3685 }
3686
3687 @Override
3688 protected ScriptObject clone() throws CloneNotSupportedException {
3689 final ScriptObject clone = (ScriptObject) super.clone();
3690 if (objectSpill != null) {
3691 clone.objectSpill = objectSpill.clone();
3692 if (primitiveSpill != null) {
3693 clone.primitiveSpill = primitiveSpill.clone();
3694 }
3695 }
3696 clone.arrayData = arrayData.copy();
3697 return clone;
3698 }
3699
3700 /**
3701 * Make a new UserAccessorProperty property. getter and setter functions are stored in
3702 * this ScriptObject and slot values are used in property object.
3703 *
3704 * @param key the property name
3705 * @param propertyFlags attribute flags of the property
3706 * @param getter getter function for the property
3707 * @param setter setter function for the property
3708 * @return the newly created UserAccessorProperty
3709 */
3710 protected final UserAccessorProperty newUserAccessors(final String key, final int propertyFlags, final ScriptFunction getter, final ScriptFunction setter) {
3711 final UserAccessorProperty uc = getMap().newUserAccessors(key, propertyFlags);
3712 //property.getSetter(Object.class, getMap());
3713 uc.setAccessors(this, getMap(), new UserAccessorProperty.Accessors(getter, setter));
3714 return uc;
3715 }
3716
3717 /**
3718 * Returns {@code true} if properties for this object should use dual field mode, {@code false} otherwise.
3719 * @return {@code true} if dual fields should be used.
3720 */
3721 protected boolean useDualFields() {
3722 return !StructureLoader.isSingleFieldStructure(getClass().getName());
3723 }
3724
3725 Object ensureSpillSize(final int slot) {
3726 final int oldLength = objectSpill == null ? 0 : objectSpill.length;
3727 if (slot < oldLength) {
3728 return this;
3729 }
3730 final int newLength = alignUp(slot + 1, SPILL_RATE);
3731 final Object[] newObjectSpill = new Object[newLength];
3732 final long[] newPrimitiveSpill = useDualFields() ? new long[newLength] : null;
3733
3734 if (objectSpill != null) {
3735 System.arraycopy(objectSpill, 0, newObjectSpill, 0, oldLength);
3736 if (primitiveSpill != null && newPrimitiveSpill != null) {
3737 System.arraycopy(primitiveSpill, 0, newPrimitiveSpill, 0, oldLength);
3738 }
3739 }
3740
3741 this.primitiveSpill = newPrimitiveSpill;
3742 this.objectSpill = newObjectSpill;
3743
3744 return this;
3745 }
3746
3747 private static MethodHandle findOwnMH_V(final Class<? extends ScriptObject> clazz, final String name, final Class<?> rtype, final Class<?>... types) {
3748 // TODO: figure out how can it work for NativeArray$Prototype etc.
3749 return MH.findVirtual(MethodHandles.lookup(), ScriptObject.class, name, MH.type(rtype, types));
3750 }
3751
3752 private static MethodHandle findOwnMH_V(final String name, final Class<?> rtype, final Class<?>... types) {
3753 return findOwnMH_V(ScriptObject.class, name, rtype, types);
3754 }
3755
3756 private static MethodHandle findOwnMH_S(final String name, final Class<?> rtype, final Class<?>... types) {
3757 return MH.findStatic(MethodHandles.lookup(), ScriptObject.class, name, MH.type(rtype, types));
3758 }
3759
3760 private static MethodHandle getKnownFunctionPropertyGuardSelf(final PropertyMap map, final MethodHandle getter, final ScriptFunction func) {
3761 return MH.insertArguments(KNOWNFUNCPROPGUARDSELF, 1, map, getter, func);
3762 }
3763
3764 @SuppressWarnings("unused")
3765 private static boolean knownFunctionPropertyGuardSelf(final Object self, final PropertyMap map, final MethodHandle getter, final ScriptFunction func) {
3766 if (self instanceof ScriptObject && ((ScriptObject)self).getMap() == map) {
3767 try {
3768 return getter.invokeExact(self) == func;
3769 } catch (final RuntimeException | Error e) {
3770 throw e;
3771 } catch (final Throwable t) {
3772 throw new RuntimeException(t);
3773 }
3774 }
3775
3776 return false;
3777 }
3778
3779 private static MethodHandle getKnownFunctionPropertyGuardProto(final PropertyMap map, final MethodHandle getter, final int depth, final ScriptFunction func) {
3780 return MH.insertArguments(KNOWNFUNCPROPGUARDPROTO, 1, map, getter, depth, func);
3781 }
3782
3783 private static ScriptObject getProto(final ScriptObject self, final int depth) {
3784 ScriptObject proto = self;
3785 for (int d = 0; d < depth; d++) {
3786 proto = proto.getProto();
3787 if (proto == null) {
3788 return null;
3789 }
3790 }
3791
3792 return proto;
3793 }
3794
3795 @SuppressWarnings("unused")
3796 private static boolean knownFunctionPropertyGuardProto(final Object self, final PropertyMap map, final MethodHandle getter, final int depth, final ScriptFunction func) {
3797 if (self instanceof ScriptObject && ((ScriptObject)self).getMap() == map) {
3798 final ScriptObject proto = getProto((ScriptObject)self, depth);
3799 if (proto == null) {
3800 return false;
3801 }
3802 try {
3803 return getter.invokeExact((Object)proto) == func;
3804 } catch (final RuntimeException | Error e) {
3805 throw e;
3806 } catch (final Throwable t) {
3807 throw new RuntimeException(t);
3808 }
3809 }
3810
3811 return false;
3812 }
3813
3814 /** This is updated only in debug mode - counts number of {@code ScriptObject} instances created */
3815 private static LongAdder count;
3816
3817 static {
3818 if (Context.DEBUG) {
3819 count = new LongAdder();
3820 }
3821 }
3822 /**
3823 * Get number of {@code ScriptObject} instances created. If not running in debug
3824 * mode this is always 0
3825 *
3826 * @return number of ScriptObjects created
3827 */
3828 public static long getCount() {
3829 return count.longValue();
3830 }
3831 }