forked from mozilla/rhino
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathArguments.java
More file actions
453 lines (397 loc) · 13.9 KB
/
Copy pathArguments.java
File metadata and controls
453 lines (397 loc) · 13.9 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
/* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
package org.mozilla.javascript;
import org.mozilla.javascript.NativeArrayIterator.ARRAY_ITERATOR_TYPE;
/**
* This class implements the "arguments" object.
*
* See ECMA 10.1.8
*
* @see org.mozilla.javascript.NativeCall
* @author Norris Boyd
*/
final class Arguments extends IdScriptableObject
{
private static final long serialVersionUID = 4275508002492040609L;
private static final String FTAG = "Arguments";
public Arguments(NativeCall activation)
{
this.activation = activation;
Scriptable parent = activation.getParentScope();
setParentScope(parent);
setPrototype(ScriptableObject.getObjectPrototype(parent));
args = activation.originalArgs;
lengthObj = Integer.valueOf(args.length);
NativeFunction f = activation.function;
calleeObj = f;
int version = f.getLanguageVersion();
if (version <= Context.VERSION_1_3
&& version != Context.VERSION_DEFAULT)
{
callerObj = null;
} else {
callerObj = NOT_FOUND;
}
defineProperty(SymbolKey.ITERATOR, iteratorMethod, ScriptableObject.DONTENUM);
}
@Override
public String getClassName()
{
return FTAG;
}
private Object arg(int index) {
if (index < 0 || args.length <= index) return NOT_FOUND;
return args[index];
}
// the following helper methods assume that 0 < index < args.length
private void putIntoActivation(int index, Object value) {
String argName = activation.function.getParamOrVarName(index);
activation.put(argName, activation, value);
}
private Object getFromActivation(int index) {
String argName = activation.function.getParamOrVarName(index);
return activation.get(argName, activation);
}
private void replaceArg(int index, Object value) {
if (sharedWithActivation(index)) {
putIntoActivation(index, value);
}
synchronized (this) {
if (args == activation.originalArgs) {
args = args.clone();
}
args[index] = value;
}
}
private void removeArg(int index) {
synchronized (this) {
if (args[index] != NOT_FOUND) {
if (args == activation.originalArgs) {
args = args.clone();
}
args[index] = NOT_FOUND;
}
}
}
// end helpers
@Override
public boolean has(int index, Scriptable start)
{
if (arg(index) != NOT_FOUND) {
return true;
}
return super.has(index, start);
}
@Override
public Object get(int index, Scriptable start)
{
final Object value = arg(index);
if (value == NOT_FOUND) {
return super.get(index, start);
}
if (sharedWithActivation(index)) {
return getFromActivation(index);
}
return value;
}
private boolean sharedWithActivation(int index)
{
Context cx = Context.getContext();
if (cx.isStrictMode()) {
return false;
}
NativeFunction f = activation.function;
int definedCount = f.getParamCount();
if (index < definedCount) {
// Check if argument is not hidden by later argument with the same
// name as hidden arguments are not shared with activation
if (index < definedCount - 1) {
String argName = f.getParamOrVarName(index);
for (int i = index + 1; i < definedCount; i++) {
if (argName.equals(f.getParamOrVarName(i))) {
return false;
}
}
}
return true;
}
return false;
}
@Override
public void put(int index, Scriptable start, Object value)
{
if (arg(index) == NOT_FOUND) {
super.put(index, start, value);
} else {
replaceArg(index, value);
}
}
@Override
public void put(String name, Scriptable start, Object value)
{
super.put(name, start, value);
}
@Override
public void delete(int index)
{
if (0 <= index && index < args.length) {
removeArg(index);
}
super.delete(index);
}
// #string_id_map#
private static final int
Id_callee = 1,
Id_length = 2,
Id_caller = 3,
MAX_INSTANCE_ID = Id_caller;
@Override
protected int getMaxInstanceId()
{
return MAX_INSTANCE_ID;
}
@Override
protected int findInstanceIdInfo(String s)
{
int id;
// #generated# Last update: 2010-01-06 05:48:21 ARST
L0: { id = 0; String X = null; int c;
int s_length = s.length();
if (s_length==6) {
c=s.charAt(5);
if (c=='e') { X="callee";id=Id_callee; }
else if (c=='h') { X="length";id=Id_length; }
else if (c=='r') { X="caller";id=Id_caller; }
}
if (X!=null && X!=s && !X.equals(s)) id = 0;
break L0;
}
// #/generated#
Context cx = Context.getContext();
if (cx.isStrictMode()) {
if (id == Id_callee || id == Id_caller) {
return super.findInstanceIdInfo(s);
}
}
if (id == 0) return super.findInstanceIdInfo(s);
int attr;
switch (id) {
case Id_callee:
attr = calleeAttr;
break;
case Id_caller:
attr = callerAttr;
break;
case Id_length:
attr = lengthAttr;
break;
default: throw new IllegalStateException();
}
return instanceIdInfo(attr, id);
}
// #/string_id_map#
@Override
protected String getInstanceIdName(int id)
{
switch (id) {
case Id_callee: return "callee";
case Id_length: return "length";
case Id_caller: return "caller";
}
return null;
}
@Override
protected Object getInstanceIdValue(int id)
{
switch (id) {
case Id_callee: return calleeObj;
case Id_length: return lengthObj;
case Id_caller: {
Object value = callerObj;
if (value == UniqueTag.NULL_VALUE) { value = null; }
else if (value == null) {
NativeCall caller = activation.parentActivationCall;
if (caller != null) {
value = caller.get("arguments", caller);
}
}
return value;
}
}
return super.getInstanceIdValue(id);
}
@Override
protected void setInstanceIdValue(int id, Object value)
{
switch (id) {
case Id_callee: calleeObj = value; return;
case Id_length: lengthObj = value; return;
case Id_caller:
callerObj = (value != null) ? value : UniqueTag.NULL_VALUE;
return;
}
super.setInstanceIdValue(id, value);
}
@Override
protected void setInstanceIdAttributes(int id, int attr)
{
switch (id) {
case Id_callee: calleeAttr = attr; return;
case Id_length: lengthAttr = attr; return;
case Id_caller: callerAttr = attr; return;
}
super.setInstanceIdAttributes(id, attr);
}
@Override
Object[] getIds(boolean getNonEnumerable, boolean getSymbols)
{
Object[] ids = super.getIds(getNonEnumerable, getSymbols);
if (args.length != 0) {
boolean[] present = new boolean[args.length];
int extraCount = args.length;
for (int i = 0; i != ids.length; ++i) {
Object id = ids[i];
if (id instanceof Integer) {
int index = ((Integer)id).intValue();
if (0 <= index && index < args.length) {
if (!present[index]) {
present[index] = true;
extraCount--;
}
}
}
}
if (!getNonEnumerable) { // avoid adding args which were redefined to non-enumerable
for (int i = 0; i < present.length; i++) {
if (!present[i] && super.has(i, this)) {
present[i] = true;
extraCount--;
}
}
}
if (extraCount != 0) {
Object[] tmp = new Object[extraCount + ids.length];
System.arraycopy(ids, 0, tmp, extraCount, ids.length);
ids = tmp;
int offset = 0;
for (int i = 0; i != args.length; ++i) {
if (!present[i]) {
ids[offset] = Integer.valueOf(i);
++offset;
}
}
if (offset != extraCount) Kit.codeBug();
}
}
return ids;
}
@Override
protected ScriptableObject getOwnPropertyDescriptor(Context cx, Object id) {
if (id instanceof Scriptable) {
return super.getOwnPropertyDescriptor(cx, id);
}
double d = ScriptRuntime.toNumber(id);
int index = (int) d;
if (d != index) {
return super.getOwnPropertyDescriptor(cx, id);
}
Object value = arg(index);
if (value == NOT_FOUND) {
return super.getOwnPropertyDescriptor(cx, id);
}
if (sharedWithActivation(index)) {
value = getFromActivation(index);
}
if (super.has(index, this)) { // the descriptor has been redefined
ScriptableObject desc = super.getOwnPropertyDescriptor(cx, id);
desc.put("value", desc, value);
return desc;
}
Scriptable scope = getParentScope();
if (scope == null) scope = this;
return buildDataDescriptor(scope, value, EMPTY);
}
@Override
protected void defineOwnProperty(Context cx, Object id,
ScriptableObject desc,
boolean checkValid) {
super.defineOwnProperty(cx, id, desc, checkValid);
double d = ScriptRuntime.toNumber(id);
int index = (int) d;
if (d != index) return;
Object value = arg(index);
if (value == NOT_FOUND) return;
if (isAccessorDescriptor(desc)) {
removeArg(index);
return;
}
Object newValue = getProperty(desc, "value");
if (newValue == NOT_FOUND) return;
replaceArg(index, newValue);
if (isFalse(getProperty(desc, "writable"))) {
removeArg(index);
}
}
// ECMAScript2015
// 9.4.4.6 CreateUnmappedArgumentsObject(argumentsList)
// 8. Perform DefinePropertyOrThrow(obj, "caller", PropertyDescriptor {[[Get]]: %ThrowTypeError%,
// [[Set]]: %ThrowTypeError%, [[Enumerable]]: false, [[Configurable]]: false}).
// 9. Perform DefinePropertyOrThrow(obj, "callee", PropertyDescriptor {[[Get]]: %ThrowTypeError%,
// [[Set]]: %ThrowTypeError%, [[Enumerable]]: false, [[Configurable]]: false}).
void defineAttributesForStrictMode() {
Context cx = Context.getContext();
if (!cx.isStrictMode()) {
return;
}
setGetterOrSetter("caller", 0, new ThrowTypeError("caller"), true);
setGetterOrSetter("caller", 0, new ThrowTypeError("caller"), false);
setGetterOrSetter("callee", 0, new ThrowTypeError("callee"), true);
setGetterOrSetter("callee", 0, new ThrowTypeError("callee"), false);
setAttributes("caller", DONTENUM | PERMANENT);
setAttributes("callee", DONTENUM | PERMANENT);
callerObj = null;
calleeObj = null;
}
private static BaseFunction iteratorMethod = new BaseFunction() {
private static final long serialVersionUID = 4239122318596177391L;
@Override
public Object call(Context cx, Scriptable scope, Scriptable thisObj,
Object[] args) {
// TODO : call %ArrayProto_values%
// 9.4.4.6 CreateUnmappedArgumentsObject(argumentsList)
// 1. Perform DefinePropertyOrThrow(obj, @@iterator, PropertyDescriptor {[[Value]]:%ArrayProto_values%,
// [[Writable]]: true, [[Enumerable]]: false, [[Configurable]]: true}).
return new NativeArrayIterator(scope, thisObj, ARRAY_ITERATOR_TYPE.VALUES);
}
};
private static class ThrowTypeError extends BaseFunction {
private static final long serialVersionUID = -744615873947395749L;
private String propertyName;
ThrowTypeError(String propertyName) {
this.propertyName = propertyName;
}
@Override
public Object call(Context cx, Scriptable scope, Scriptable thisObj, Object[] args) {
throw ScriptRuntime.typeError1("msg.arguments.not.access.strict", propertyName);
}
}
// Fields to hold caller, callee and length properties,
// where NOT_FOUND value tags deleted properties.
// In addition if callerObj == NULL_VALUE, it tags null for scripts, as
// initial callerObj == null means access to caller arguments available
// only in JS <= 1.3 scripts
private Object callerObj;
private Object calleeObj;
private Object lengthObj;
private int callerAttr = DONTENUM;
private int calleeAttr = DONTENUM;
private int lengthAttr = DONTENUM;
private NativeCall activation;
// Initially args holds activation.getOriginalArgs(), but any modification
// of its elements triggers creation of a copy. If its element holds NOT_FOUND,
// it indicates deleted index, in which case super class is queried.
private Object[] args;
}