1 /*
2 * Copyright (c) 2023 Huawei Device Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16 #include "ecmascript/element_accessor.h"
17
18 #include "ecmascript/base/number_helper.h"
19 #include "ecmascript/ecma_vm.h"
20 #include "ecmascript/js_array.h"
21 #include "ecmascript/js_hclass.h"
22 #include "ecmascript/js_tagged_number.h"
23 #include "ecmascript/js_tagged_value-inl.h"
24
25 namespace panda::ecmascript {
Get(JSHandle<JSObject> receiver,uint32_t idx)26 JSTaggedValue ElementAccessor::Get(JSHandle<JSObject> receiver, uint32_t idx)
27 {
28 TaggedArray *elements = TaggedArray::Cast(receiver->GetElements());
29 ASSERT(idx < elements->GetLength());
30 ElementsKind kind = receiver->GetClass()->GetElementsKind();
31 if (!elements->GetClass()->IsMutantTaggedArray()) {
32 kind = ElementsKind::GENERIC;
33 }
34 // Note: Here we can't statically decide the element type is a primitive or heap object, especially for
35 // dynamically-typed languages like JavaScript. So we simply skip the read-barrier.
36 size_t offset = JSTaggedValue::TaggedTypeSize() * idx;
37 // NOLINTNEXTLINE(readability-braces-around-statements, bugprone-suspicious-semicolon)
38 JSTaggedType rawValue = Barriers::GetValue<JSTaggedType>(elements->GetData(), offset);
39 return GetTaggedValueWithElementsKind(rawValue, kind);
40 }
41
Get(JSObject * receiver,uint32_t idx)42 JSTaggedValue ElementAccessor::Get(JSObject *receiver, uint32_t idx)
43 {
44 TaggedArray *elements = TaggedArray::Cast(receiver->GetElements());
45 ASSERT(idx < elements->GetLength());
46 ElementsKind kind = receiver->GetClass()->GetElementsKind();
47 if (!elements->GetClass()->IsMutantTaggedArray()) {
48 kind = ElementsKind::GENERIC;
49 }
50 // Note: Here we can't statically decide the element type is a primitive or heap object, especially for
51 // dynamically-typed languages like JavaScript. So we simply skip the read-barrier.
52 size_t offset = JSTaggedValue::TaggedTypeSize() * idx;
53 // NOLINTNEXTLINE(readability-braces-around-statements, bugprone-suspicious-semicolon)
54 JSTaggedType rawValue = Barriers::GetValue<JSTaggedType>(elements->GetData(), offset);
55 return GetTaggedValueWithElementsKind(rawValue, kind);
56 }
57
IsDictionaryMode(JSHandle<JSObject> receiver)58 bool ElementAccessor::IsDictionaryMode(JSHandle<JSObject> receiver)
59 {
60 TaggedArray *elements = TaggedArray::Cast(receiver->GetElements());
61 return elements->GetClass()->IsDictionary();
62 }
63
IsDictionaryMode(JSObject * receiver)64 bool ElementAccessor::IsDictionaryMode(JSObject *receiver)
65 {
66 TaggedArray *elements = TaggedArray::Cast(receiver->GetElements());
67 return elements->GetClass()->IsDictionary();
68 }
69
GetElementsLength(JSHandle<JSObject> receiver)70 uint32_t ElementAccessor::GetElementsLength(JSHandle<JSObject> receiver)
71 {
72 TaggedArray *elements = TaggedArray::Cast(receiver->GetElements());
73 return elements->GetLength();
74 }
75
GetElementsLength(JSObject * receiver)76 uint32_t ElementAccessor::GetElementsLength(JSObject *receiver)
77 {
78 TaggedArray *elements = TaggedArray::Cast(receiver->GetElements());
79 return elements->GetLength();
80 }
81
GetTaggedValueWithElementsKind(JSTaggedType rawValue,ElementsKind kind)82 JSTaggedValue ElementAccessor::GetTaggedValueWithElementsKind(JSTaggedType rawValue, ElementsKind kind)
83 {
84 JSTaggedValue convertedValue = JSTaggedValue::Hole();
85 if (rawValue == base::SPECIAL_HOLE) {
86 return convertedValue;
87 }
88 switch (kind) {
89 case ElementsKind::INT:
90 case ElementsKind::HOLE_INT:
91 convertedValue = JSTaggedValue(static_cast<int>(rawValue));
92 break;
93 case ElementsKind::NUMBER:
94 case ElementsKind::HOLE_NUMBER:
95 convertedValue = JSTaggedValue(base::bit_cast<double>(rawValue));
96 break;
97 case ElementsKind::TAGGED:
98 case ElementsKind::STRING:
99 case ElementsKind::HOLE_TAGGED:
100 case ElementsKind::HOLE_STRING:
101 convertedValue = JSTaggedValue(rawValue);
102 break;
103 default:
104 LOG_ECMA(FATAL) << "Trying to Get TaggedValue With Unknown ElementsKind";
105 UNREACHABLE();
106 break;
107 }
108 return convertedValue;
109 }
110
ConvertTaggedValueWithElementsKind(JSTaggedValue rawValue,ElementsKind kind)111 JSTaggedType ElementAccessor::ConvertTaggedValueWithElementsKind(JSTaggedValue rawValue, ElementsKind kind)
112 {
113 JSTaggedType convertedValue = base::SPECIAL_HOLE;
114 if (rawValue.IsHole() && Elements::IsInNumbers(kind)) {
115 return convertedValue;
116 }
117 switch (kind) {
118 case ElementsKind::INT:
119 case ElementsKind::HOLE_INT:
120 convertedValue = static_cast<JSTaggedType>(rawValue.GetInt());
121 break;
122 case ElementsKind::NUMBER:
123 case ElementsKind::HOLE_NUMBER:
124 if (rawValue.IsInt()) {
125 int intValue = rawValue.GetInt();
126 convertedValue = base::bit_cast<JSTaggedType>(static_cast<double>(intValue));
127 } else {
128 convertedValue = base::bit_cast<JSTaggedType>(rawValue.GetDouble());
129 }
130 break;
131 case ElementsKind::TAGGED:
132 case ElementsKind::STRING:
133 case ElementsKind::HOLE_TAGGED:
134 case ElementsKind::HOLE_STRING:
135 convertedValue = rawValue.GetRawData();
136 break;
137 default:
138 LOG_ECMA(FATAL) << "Trying to Convert TaggedValue With Unknown ElementsKind";
139 UNREACHABLE();
140 break;
141 }
142 return convertedValue;
143 }
144 } // namespace panda::ecmascript
145