V8 API Reference, 7.2.502.16 (for Deno 0.2.4)
builtins-reflect.cc
1 // Copyright 2016 the V8 project authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4 
5 #include "src/builtins/builtins-utils-inl.h"
6 #include "src/builtins/builtins.h"
7 #include "src/counters.h"
8 #include "src/keys.h"
9 #include "src/lookup.h"
10 #include "src/objects-inl.h"
11 #include "src/property-descriptor.h"
12 
13 namespace v8 {
14 namespace internal {
15 
16 // -----------------------------------------------------------------------------
17 // ES6 section 26.1 The Reflect Object
18 
19 // ES6 section 26.1.3 Reflect.defineProperty
20 BUILTIN(ReflectDefineProperty) {
21  HandleScope scope(isolate);
22  DCHECK_EQ(4, args.length());
23  Handle<Object> target = args.at(1);
24  Handle<Object> key = args.at(2);
25  Handle<Object> attributes = args.at(3);
26 
27  if (!target->IsJSReceiver()) {
28  THROW_NEW_ERROR_RETURN_FAILURE(
29  isolate, NewTypeError(MessageTemplate::kCalledOnNonObject,
30  isolate->factory()->NewStringFromAsciiChecked(
31  "Reflect.defineProperty")));
32  }
33 
34  Handle<Name> name;
35  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, name,
36  Object::ToName(isolate, key));
37 
38  PropertyDescriptor desc;
39  if (!PropertyDescriptor::ToPropertyDescriptor(isolate, attributes, &desc)) {
40  return ReadOnlyRoots(isolate).exception();
41  }
42 
43  Maybe<bool> result = JSReceiver::DefineOwnProperty(
44  isolate, Handle<JSReceiver>::cast(target), name, &desc, kDontThrow);
45  MAYBE_RETURN(result, ReadOnlyRoots(isolate).exception());
46  return *isolate->factory()->ToBoolean(result.FromJust());
47 }
48 
49 // ES6 section 26.1.4 Reflect.deleteProperty
50 BUILTIN(ReflectDeleteProperty) {
51  HandleScope scope(isolate);
52  DCHECK_EQ(3, args.length());
53  Handle<Object> target = args.at(1);
54  Handle<Object> key = args.at(2);
55 
56  if (!target->IsJSReceiver()) {
57  THROW_NEW_ERROR_RETURN_FAILURE(
58  isolate, NewTypeError(MessageTemplate::kCalledOnNonObject,
59  isolate->factory()->NewStringFromAsciiChecked(
60  "Reflect.deleteProperty")));
61  }
62 
63  Handle<Name> name;
64  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, name,
65  Object::ToName(isolate, key));
66 
67  Maybe<bool> result = JSReceiver::DeletePropertyOrElement(
68  Handle<JSReceiver>::cast(target), name, LanguageMode::kSloppy);
69  MAYBE_RETURN(result, ReadOnlyRoots(isolate).exception());
70  return *isolate->factory()->ToBoolean(result.FromJust());
71 }
72 
73 // ES6 section 26.1.6 Reflect.get
74 BUILTIN(ReflectGet) {
75  HandleScope scope(isolate);
76  Handle<Object> target = args.atOrUndefined(isolate, 1);
77  Handle<Object> key = args.atOrUndefined(isolate, 2);
78  Handle<Object> receiver = args.length() > 3 ? args.at(3) : target;
79 
80  if (!target->IsJSReceiver()) {
81  THROW_NEW_ERROR_RETURN_FAILURE(
82  isolate, NewTypeError(MessageTemplate::kCalledOnNonObject,
83  isolate->factory()->NewStringFromAsciiChecked(
84  "Reflect.get")));
85  }
86 
87  Handle<Name> name;
88  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, name,
89  Object::ToName(isolate, key));
90 
91  RETURN_RESULT_OR_FAILURE(
92  isolate, Object::GetPropertyOrElement(receiver, name,
93  Handle<JSReceiver>::cast(target)));
94 }
95 
96 // ES6 section 26.1.7 Reflect.getOwnPropertyDescriptor
97 BUILTIN(ReflectGetOwnPropertyDescriptor) {
98  HandleScope scope(isolate);
99  DCHECK_EQ(3, args.length());
100  Handle<Object> target = args.at(1);
101  Handle<Object> key = args.at(2);
102 
103  if (!target->IsJSReceiver()) {
104  THROW_NEW_ERROR_RETURN_FAILURE(
105  isolate, NewTypeError(MessageTemplate::kCalledOnNonObject,
106  isolate->factory()->NewStringFromAsciiChecked(
107  "Reflect.getOwnPropertyDescriptor")));
108  }
109 
110  Handle<Name> name;
111  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, name,
112  Object::ToName(isolate, key));
113 
114  PropertyDescriptor desc;
115  Maybe<bool> found = JSReceiver::GetOwnPropertyDescriptor(
116  isolate, Handle<JSReceiver>::cast(target), name, &desc);
117  MAYBE_RETURN(found, ReadOnlyRoots(isolate).exception());
118  if (!found.FromJust()) return ReadOnlyRoots(isolate).undefined_value();
119  return *desc.ToObject(isolate);
120 }
121 
122 // ES6 section 26.1.8 Reflect.getPrototypeOf
123 BUILTIN(ReflectGetPrototypeOf) {
124  HandleScope scope(isolate);
125  DCHECK_EQ(2, args.length());
126  Handle<Object> target = args.at(1);
127 
128  if (!target->IsJSReceiver()) {
129  THROW_NEW_ERROR_RETURN_FAILURE(
130  isolate, NewTypeError(MessageTemplate::kCalledOnNonObject,
131  isolate->factory()->NewStringFromAsciiChecked(
132  "Reflect.getPrototypeOf")));
133  }
134  Handle<JSReceiver> receiver = Handle<JSReceiver>::cast(target);
135  RETURN_RESULT_OR_FAILURE(isolate,
136  JSReceiver::GetPrototype(isolate, receiver));
137 }
138 
139 // ES6 section 26.1.10 Reflect.isExtensible
140 BUILTIN(ReflectIsExtensible) {
141  HandleScope scope(isolate);
142  DCHECK_EQ(2, args.length());
143  Handle<Object> target = args.at(1);
144 
145  if (!target->IsJSReceiver()) {
146  THROW_NEW_ERROR_RETURN_FAILURE(
147  isolate, NewTypeError(MessageTemplate::kCalledOnNonObject,
148  isolate->factory()->NewStringFromAsciiChecked(
149  "Reflect.isExtensible")));
150  }
151 
152  Maybe<bool> result =
153  JSReceiver::IsExtensible(Handle<JSReceiver>::cast(target));
154  MAYBE_RETURN(result, ReadOnlyRoots(isolate).exception());
155  return *isolate->factory()->ToBoolean(result.FromJust());
156 }
157 
158 // ES6 section 26.1.11 Reflect.ownKeys
159 BUILTIN(ReflectOwnKeys) {
160  HandleScope scope(isolate);
161  DCHECK_EQ(2, args.length());
162  Handle<Object> target = args.at(1);
163 
164  if (!target->IsJSReceiver()) {
165  THROW_NEW_ERROR_RETURN_FAILURE(
166  isolate, NewTypeError(MessageTemplate::kCalledOnNonObject,
167  isolate->factory()->NewStringFromAsciiChecked(
168  "Reflect.ownKeys")));
169  }
170 
171  Handle<FixedArray> keys;
172  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
173  isolate, keys,
174  KeyAccumulator::GetKeys(Handle<JSReceiver>::cast(target),
175  KeyCollectionMode::kOwnOnly, ALL_PROPERTIES,
176  GetKeysConversion::kConvertToString));
177  return *isolate->factory()->NewJSArrayWithElements(keys);
178 }
179 
180 // ES6 section 26.1.12 Reflect.preventExtensions
181 BUILTIN(ReflectPreventExtensions) {
182  HandleScope scope(isolate);
183  DCHECK_EQ(2, args.length());
184  Handle<Object> target = args.at(1);
185 
186  if (!target->IsJSReceiver()) {
187  THROW_NEW_ERROR_RETURN_FAILURE(
188  isolate, NewTypeError(MessageTemplate::kCalledOnNonObject,
189  isolate->factory()->NewStringFromAsciiChecked(
190  "Reflect.preventExtensions")));
191  }
192 
193  Maybe<bool> result = JSReceiver::PreventExtensions(
194  Handle<JSReceiver>::cast(target), kDontThrow);
195  MAYBE_RETURN(result, ReadOnlyRoots(isolate).exception());
196  return *isolate->factory()->ToBoolean(result.FromJust());
197 }
198 
199 // ES6 section 26.1.13 Reflect.set
200 BUILTIN(ReflectSet) {
201  HandleScope scope(isolate);
202  Handle<Object> target = args.atOrUndefined(isolate, 1);
203  Handle<Object> key = args.atOrUndefined(isolate, 2);
204  Handle<Object> value = args.atOrUndefined(isolate, 3);
205  Handle<Object> receiver = args.length() > 4 ? args.at(4) : target;
206 
207  if (!target->IsJSReceiver()) {
208  THROW_NEW_ERROR_RETURN_FAILURE(
209  isolate, NewTypeError(MessageTemplate::kCalledOnNonObject,
210  isolate->factory()->NewStringFromAsciiChecked(
211  "Reflect.set")));
212  }
213 
214  Handle<Name> name;
215  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, name,
216  Object::ToName(isolate, key));
217 
218  LookupIterator it = LookupIterator::PropertyOrElement(
219  isolate, receiver, name, Handle<JSReceiver>::cast(target));
220  Maybe<bool> result = Object::SetSuperProperty(
221  &it, value, LanguageMode::kSloppy, StoreOrigin::kMaybeKeyed);
222  MAYBE_RETURN(result, ReadOnlyRoots(isolate).exception());
223  return *isolate->factory()->ToBoolean(result.FromJust());
224 }
225 
226 // ES6 section 26.1.14 Reflect.setPrototypeOf
227 BUILTIN(ReflectSetPrototypeOf) {
228  HandleScope scope(isolate);
229  DCHECK_EQ(3, args.length());
230  Handle<Object> target = args.at(1);
231  Handle<Object> proto = args.at(2);
232 
233  if (!target->IsJSReceiver()) {
234  THROW_NEW_ERROR_RETURN_FAILURE(
235  isolate, NewTypeError(MessageTemplate::kCalledOnNonObject,
236  isolate->factory()->NewStringFromAsciiChecked(
237  "Reflect.setPrototypeOf")));
238  }
239 
240  if (!proto->IsJSReceiver() && !proto->IsNull(isolate)) {
241  THROW_NEW_ERROR_RETURN_FAILURE(
242  isolate, NewTypeError(MessageTemplate::kProtoObjectOrNull, proto));
243  }
244 
245  Maybe<bool> result = JSReceiver::SetPrototype(
246  Handle<JSReceiver>::cast(target), proto, true, kDontThrow);
247  MAYBE_RETURN(result, ReadOnlyRoots(isolate).exception());
248  return *isolate->factory()->ToBoolean(result.FromJust());
249 }
250 
251 } // namespace internal
252 } // namespace v8
v8
Definition: libplatform.h:13