1 /*
2  * Copyright (c) 2021-2024 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 #ifndef ECMASCRIPT_JSNATIVEPOINTER_H
17 #define ECMASCRIPT_JSNATIVEPOINTER_H
18 
19 #include "ecmascript/ecma_macros.h"
20 #include "ecmascript/mem/barriers.h"
21 #include "ecmascript/mem/tagged_object.h"
22 #include "ecmascript/mem/visitor.h"
23 #include "ecmascript/mem/native_area_allocator.h"
24 
25 namespace panda::ecmascript {
26 // Used for the requirement of ACE that wants to associated a registered C++ resource with a JSObject.
27 class JSNativePointer : public TaggedObject {
28 public:
Cast(TaggedObject *object)29     static JSNativePointer *Cast(TaggedObject *object)
30     {
31         ASSERT(JSTaggedValue(object).IsJSNativePointer());
32         return reinterpret_cast<JSNativePointer *>(object);
33     }
34 
35     void ResetExternalPointer(JSThread *thread, void *externalPointer);
36 
37     void Destroy(JSThread *thread);
38 
39     void Detach();
40 
41     static constexpr size_t POINTER_OFFSET = TaggedObjectSize();
42     ACCESSORS_NATIVE_FIELD(ExternalPointer, void, POINTER_OFFSET, DELETER_OFFSET);
43     ACCESSORS_PRIMITIVE_FIELD(Deleter, NativePointerCallback, DELETER_OFFSET, DATA_OFFSET)
44     ACCESSORS_NATIVE_FIELD(Data, void, DATA_OFFSET, DATA_SIZE_OFFSET);
45     ACCESSORS_PRIMITIVE_FIELD(BindingSize, uint32_t, DATA_SIZE_OFFSET, FLAG_OFFSET);
46     // native memory statistic flag
47     ACCESSORS_PRIMITIVE_FIELD(NativeFlag, NativeFlag, FLAG_OFFSET, LAST_OFFSET);
48     DEFINE_ALIGN_SIZE(LAST_OFFSET);
49 
50     DECL_VISIT_NATIVE_FIELD(POINTER_OFFSET, DATA_SIZE_OFFSET)
51 
52 private:
53     void DeleteExternalPointer(JSThread *thread);
54 };
55 }  // namespace panda::ecmascript
56 #endif  // ECMASCRIPT_JSNATIVEPOINTER_H
57