1 /*
2  * Copyright (c) 2021 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_SNAPSHOT_MEM_SNAPSHOT_ENV_H
17 #define ECMASCRIPT_SNAPSHOT_MEM_SNAPSHOT_ENV_H
18 
19 #include <unordered_map>
20 
21 #include "ecmascript/js_thread.h"
22 #include "ecmascript/mem/visitor.h"
23 
24 namespace panda::ecmascript {
25 class EcmaVM;
26 
27 class SnapshotEnv final {
28 public:
SnapshotEnv(EcmaVM *vm)29     explicit SnapshotEnv(EcmaVM *vm) : vm_(vm) {}
30     ~SnapshotEnv() = default;
31 
32     void AddGlobalConstToMap();
33 
ClearEnvMap()34     void ClearEnvMap()
35     {
36         rootObjectMap_.clear();
37     }
38 
39     void Iterate(const RootVisitor &v, VMRootVisitType type);
40 
Push(JSTaggedType objectAddr, uint32_t index)41     void Push(JSTaggedType objectAddr, uint32_t index)
42     {
43         if (multiThreadCheckValue_.exchange(JSThread::GetCurrentThreadId()) != 0) {
44             LOG_ECMA(FATAL) << "SnapshotEnv push multi-thread check fail, thread id: " << multiThreadCheckValue_;
45         }
46         rootObjectMap_.emplace(objectAddr, index);
47         multiThreadCheckValue_ = 0;
48     }
49 
Remove(JSTaggedType objectAddr)50     void Remove(JSTaggedType objectAddr)
51     {
52         if (multiThreadCheckValue_.exchange(JSThread::GetCurrentThreadId()) != 0) {
53             LOG_ECMA(FATAL) << "SnapshotEnv remove multi-thread check fail, thread id: " << multiThreadCheckValue_;
54         }
55         rootObjectMap_.erase(objectAddr);
56         multiThreadCheckValue_ = 0;
57     }
58 
FindEnvObjectIndex(JSTaggedType objectAddr) const59     uint32_t FindEnvObjectIndex(JSTaggedType objectAddr) const
60     {
61         if (rootObjectMap_.find(objectAddr) != rootObjectMap_.end()) {
62             return rootObjectMap_.find(objectAddr)->second;
63         }
64         return MAX_UINT_32;
65     }
66 
67     JSTaggedType RelocateRootObjectAddr(uint32_t index);
68 
69     static constexpr size_t MAX_UINT_32 = 0xFFFFFFFF;
70 
71 private:
72     NO_MOVE_SEMANTIC(SnapshotEnv);
73     NO_COPY_SEMANTIC(SnapshotEnv);
74 
75     void InitGlobalConst();
76     void InitGlobalEnv();
77 
78     EcmaVM *vm_;
79     std::unordered_map<JSTaggedType, uint32_t> rootObjectMap_;
80     std::atomic<uint32_t> multiThreadCheckValue_ {0};
81 };
82 }  // namespace panda::ecmascript
83 #endif  // ECMASCRIPT_SNAPSHOT_MEM_SNAPSHOT_ENV_H
84